drivers/s390/block/dasd_eckd.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   5  *                  Carsten Otte <Cotte@de.ibm.com>
   6  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   7  * Bugreports.to..: <Linux390@de.ibm.com>
   8  * Copyright IBM Corp. 1999, 2009
   9  * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
  10  * Author.........: Nigel Hislop <hislop_nigel@emc.com>
  11  */
  12
  13 #define KMSG_COMPONENT "dasd-eckd"
  14
  15 #include <linux/stddef.h>
  16 #include <linux/kernel.h>
  17 #include <linux/slab.h>
  18 #include <linux/hdreg.h>        /* HDIO_GETGEO                      */
  19 #include <linux/bio.h>
  20 #include <linux/module.h>
  21 #include <linux/compat.h>
  22 #include <linux/init.h>
  23 #include <linux/seq_file.h>
  24
  25 #include <asm/css_chars.h>
  26 #include <asm/debug.h>
  27 #include <asm/idals.h>
  28 #include <asm/ebcdic.h>
  29 #include <asm/io.h>
  30 #include <linux/uaccess.h>
  31 #include <asm/cio.h>
  32 #include <asm/ccwdev.h>
  33 #include <asm/itcw.h>
  34 #include <asm/schid.h>
  35 #include <asm/chpid.h>
  36
  37 #include "dasd_int.h"
  38 #include "dasd_eckd.h"
  39
  40 #ifdef PRINTK_HEADER
  41 #undef PRINTK_HEADER
  42 #endif                          /* PRINTK_HEADER */
  43 #define PRINTK_HEADER "dasd(eckd):"
  44
  45 #define ECKD_C0(i) (i->home_bytes)
  46 #define ECKD_F(i) (i->formula)
  47 #define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
  48                     (i->factors.f_0x02.f1))
  49 #define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
  50                     (i->factors.f_0x02.f2))
  51 #define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
  52                     (i->factors.f_0x02.f3))
  53 #define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
  54 #define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
  55 #define ECKD_F6(i) (i->factor6)
  56 #define ECKD_F7(i) (i->factor7)
  57 #define ECKD_F8(i) (i->factor8)
  58
  59 /*
  60  * raw track access always map to 64k in memory
  61  * so it maps to 16 blocks of 4k per track
  62  */
  63 #define DASD_RAW_BLOCK_PER_TRACK 16
  64 #define DASD_RAW_BLOCKSIZE 4096
  65 /* 64k are 128 x 512 byte sectors  */
  66 #define DASD_RAW_SECTORS_PER_TRACK 128
  67
  68 MODULE_LICENSE("GPL");
  69
  70 static struct dasd_discipline dasd_eckd_discipline;
  71
  72 /* The ccw bus type uses this table to find devices that it sends to
  73  * dasd_eckd_probe */
  74 static struct ccw_device_id dasd_eckd_ids[] = {
  75         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
  76         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
  77         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3380, 0), .driver_info = 0x3},
  78         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
  79         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
  80         { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
  81         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
  82         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
  83         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
  84         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
  85         { /* end of list */ },
  86 };
  87
  88 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
  89
  90 static struct ccw_driver dasd_eckd_driver; /* see below */
  91
  92 static void *rawpadpage;
  93
  94 #define INIT_CQR_OK 0
  95 #define INIT_CQR_UNFORMATTED 1
  96 #define INIT_CQR_ERROR 2
  97
  98 /* emergency request for reserve/release */
  99 static struct {
 100         struct dasd_ccw_req cqr;
 101         struct ccw1 ccw;
 102         char data[32];
 103 } *dasd_reserve_req;
 104 static DEFINE_MUTEX(dasd_reserve_mutex);
 105
 106 /* definitions for the path verification worker */
 107 struct path_verification_work_data {
 108         struct work_struct worker;
 109         struct dasd_device *device;
 110         struct dasd_ccw_req cqr;
 111         struct ccw1 ccw;
 112         __u8 rcd_buffer[DASD_ECKD_RCD_DATA_SIZE];
 113         int isglobal;
 114         __u8 tbvpm;
 115 };
 116 static struct path_verification_work_data *path_verification_worker;
 117 static DEFINE_MUTEX(dasd_path_verification_mutex);
 118
 119 struct check_attention_work_data {
 120         struct work_struct worker;
 121         struct dasd_device *device;
 122         __u8 lpum;
 123 };
 124
 125 static int prepare_itcw(struct itcw *, unsigned int, unsigned int, int,
 126                         struct dasd_device *, struct dasd_device *,
 127                         unsigned int, int, unsigned int, unsigned int,
 128                         unsigned int, unsigned int);
 129
 130 /* initial attempt at a probe function. this can be simplified once
 131  * the other detection code is gone */
 132 static int
 133 dasd_eckd_probe (struct ccw_device *cdev)
 134 {
 135         int ret;
 136
 137         /* set ECKD specific ccw-device options */
 138         ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE |
 139                                      CCWDEV_DO_PATHGROUP | CCWDEV_DO_MULTIPATH);
 140         if (ret) {
 141                 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
 142                                 "dasd_eckd_probe: could not set "
 143                                 "ccw-device options");
 144                 return ret;
 145         }
 146         ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
 147         return ret;
 148 }
 149
 150 static int
 151 dasd_eckd_set_online(struct ccw_device *cdev)
 152 {
 153         return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
 154 }
 155
 156 static const int sizes_trk0[] = { 28, 148, 84 };
 157 #define LABEL_SIZE 140
 158
 159 /* head and record addresses of count_area read in analysis ccw */
 160 static const int count_area_head[] = { 0, 0, 0, 0, 2 };
 161 static const int count_area_rec[] = { 1, 2, 3, 4, 1 };
 162
 163 static inline unsigned int
 164 round_up_multiple(unsigned int no, unsigned int mult)
 165 {
 166         int rem = no % mult;
 167         return (rem ? no - rem + mult : no);
 168 }
 169
 170 static inline unsigned int
 171 ceil_quot(unsigned int d1, unsigned int d2)
 172 {
 173         return (d1 + (d2 - 1)) / d2;
 174 }
 175
 176 static unsigned int
 177 recs_per_track(struct dasd_eckd_characteristics * rdc,
 178                unsigned int kl, unsigned int dl)
 179 {
 180         int dn, kn;
 181
 182         switch (rdc->dev_type) {
 183         case 0x3380:
 184                 if (kl)
 185                         return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
 186                                        ceil_quot(dl + 12, 32));
 187                 else
 188                         return 1499 / (15 + ceil_quot(dl + 12, 32));
 189         case 0x3390:
 190                 dn = ceil_quot(dl + 6, 232) + 1;
 191                 if (kl) {
 192                         kn = ceil_quot(kl + 6, 232) + 1;
 193                         return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
 194                                        9 + ceil_quot(dl + 6 * dn, 34));
 195                 } else
 196                         return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
 197         case 0x9345:
 198                 dn = ceil_quot(dl + 6, 232) + 1;
 199                 if (kl) {
 200                         kn = ceil_quot(kl + 6, 232) + 1;
 201                         return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
 202                                        ceil_quot(dl + 6 * dn, 34));
 203                 } else
 204                         return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
 205         }
 206         return 0;
 207 }
 208
 209 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
 210 {
 211         geo->cyl = (__u16) cyl;
 212         geo->head = cyl >> 16;
 213         geo->head <<= 4;
 214         geo->head |= head;
 215 }
 216
 217 static int set_timestamp(struct ccw1 *ccw, struct DE_eckd_data *data,
 218                      struct dasd_device *device)
 219 {
 220         struct dasd_eckd_private *private = device->private;
 221         int rc;
 222
 223         rc = get_phys_clock(&data->ep_sys_time);
 224         /*
 225          * Ignore return code if XRC is not supported or
 226          * sync clock is switched off
 227          */
 228         if ((rc && !private->rdc_data.facilities.XRC_supported) ||
 229             rc == -EOPNOTSUPP || rc == -EACCES)
 230                 return 0;
 231
 232         /* switch on System Time Stamp - needed for XRC Support */
 233         data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid'   */
 234         data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
 235
 236         if (ccw) {
 237                 ccw->count = sizeof(struct DE_eckd_data);
 238                 ccw->flags |= CCW_FLAG_SLI;
 239         }
 240
 241         return rc;
 242 }
 243
 244 static int
 245 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
 246               unsigned int totrk, int cmd, struct dasd_device *device,
 247               int blksize)
 248 {
 249         struct dasd_eckd_private *private = device->private;
 250         u16 heads, beghead, endhead;
 251         u32 begcyl, endcyl;
 252         int rc = 0;
 253
 254         if (ccw) {
 255                 ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
 256                 ccw->flags = 0;
 257                 ccw->count = 16;
 258                 ccw->cda = (__u32)__pa(data);
 259         }
 260
 261         memset(data, 0, sizeof(struct DE_eckd_data));
 262         switch (cmd) {
 263         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 264         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 265         case DASD_ECKD_CCW_READ:
 266         case DASD_ECKD_CCW_READ_MT:
 267         case DASD_ECKD_CCW_READ_CKD:
 268         case DASD_ECKD_CCW_READ_CKD_MT:
 269         case DASD_ECKD_CCW_READ_KD:
 270         case DASD_ECKD_CCW_READ_KD_MT:
 271                 data->mask.perm = 0x1;
 272                 data->attributes.operation = private->attrib.operation;
 273                 break;
 274         case DASD_ECKD_CCW_READ_COUNT:
 275                 data->mask.perm = 0x1;
 276                 data->attributes.operation = DASD_BYPASS_CACHE;
 277                 break;
 278         case DASD_ECKD_CCW_READ_TRACK:
 279         case DASD_ECKD_CCW_READ_TRACK_DATA:
 280                 data->mask.perm = 0x1;
 281                 data->attributes.operation = private->attrib.operation;
 282                 data->blk_size = 0;
 283                 break;
 284         case DASD_ECKD_CCW_WRITE:
 285         case DASD_ECKD_CCW_WRITE_MT:
 286         case DASD_ECKD_CCW_WRITE_KD:
 287         case DASD_ECKD_CCW_WRITE_KD_MT:
 288                 data->mask.perm = 0x02;
 289                 data->attributes.operation = private->attrib.operation;
 290                 rc = set_timestamp(ccw, data, device);
 291                 break;
 292         case DASD_ECKD_CCW_WRITE_CKD:
 293         case DASD_ECKD_CCW_WRITE_CKD_MT:
 294                 data->attributes.operation = DASD_BYPASS_CACHE;
 295                 rc = set_timestamp(ccw, data, device);
 296                 break;
 297         case DASD_ECKD_CCW_ERASE:
 298         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 299         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 300                 data->mask.perm = 0x3;
 301                 data->mask.auth = 0x1;
 302                 data->attributes.operation = DASD_BYPASS_CACHE;
 303                 rc = set_timestamp(ccw, data, device);
 304                 break;
 305         case DASD_ECKD_CCW_WRITE_FULL_TRACK:
 306                 data->mask.perm = 0x03;
 307                 data->attributes.operation = private->attrib.operation;
 308                 data->blk_size = 0;
 309                 break;
 310         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 311                 data->mask.perm = 0x02;
 312                 data->attributes.operation = private->attrib.operation;
 313                 data->blk_size = blksize;
 314                 rc = set_timestamp(ccw, data, device);
 315                 break;
 316         default:
 317                 dev_err(&device->cdev->dev,
 318                         "0x%x is not a known command\n", cmd);
 319                 break;
 320         }
 321
 322         data->attributes.mode = 0x3;    /* ECKD */
 323
 324         if ((private->rdc_data.cu_type == 0x2105 ||
 325              private->rdc_data.cu_type == 0x2107 ||
 326              private->rdc_data.cu_type == 0x1750)
 327             && !(private->uses_cdl && trk < 2))
 328                 data->ga_extended |= 0x40; /* Regular Data Format Mode */
 329
 330         heads = private->rdc_data.trk_per_cyl;
 331         begcyl = trk / heads;
 332         beghead = trk % heads;
 333         endcyl = totrk / heads;
 334         endhead = totrk % heads;
 335
 336         /* check for sequential prestage - enhance cylinder range */
 337         if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
 338             data->attributes.operation == DASD_SEQ_ACCESS) {
 339
 340                 if (endcyl + private->attrib.nr_cyl < private->real_cyl)
 341                         endcyl += private->attrib.nr_cyl;
 342                 else
 343                         endcyl = (private->real_cyl - 1);
 344         }
 345
 346         set_ch_t(&data->beg_ext, begcyl, beghead);
 347         set_ch_t(&data->end_ext, endcyl, endhead);
 348         return rc;
 349 }
 350
 351
 352 static void locate_record_ext(struct ccw1 *ccw, struct LRE_eckd_data *data,
 353                               unsigned int trk, unsigned int rec_on_trk,
 354                               int count, int cmd, struct dasd_device *device,
 355                               unsigned int reclen, unsigned int tlf)
 356 {
 357         struct dasd_eckd_private *private = device->private;
 358         int sector;
 359         int dn, d;
 360
 361         if (ccw) {
 362                 ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD_EXT;
 363                 ccw->flags = 0;
 364                 if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK)
 365                         ccw->count = 22;
 366                 else
 367                         ccw->count = 20;
 368                 ccw->cda = (__u32)__pa(data);
 369         }
 370
 371         memset(data, 0, sizeof(*data));
 372         sector = 0;
 373         if (rec_on_trk) {
 374                 switch (private->rdc_data.dev_type) {
 375                 case 0x3390:
 376                         dn = ceil_quot(reclen + 6, 232);
 377                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 378                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 379                         break;
 380                 case 0x3380:
 381                         d = 7 + ceil_quot(reclen + 12, 32);
 382                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 383                         break;
 384                 }
 385         }
 386         data->sector = sector;
 387         /* note: meaning of count depends on the operation
 388          *       for record based I/O it's the number of records, but for
 389          *       track based I/O it's the number of tracks
 390          */
 391         data->count = count;
 392         switch (cmd) {
 393         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 394                 data->operation.orientation = 0x3;
 395                 data->operation.operation = 0x03;
 396                 break;
 397         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 398                 data->operation.orientation = 0x3;
 399                 data->operation.operation = 0x16;
 400                 break;
 401         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 402                 data->operation.orientation = 0x1;
 403                 data->operation.operation = 0x03;
 404                 data->count++;
 405                 break;
 406         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 407                 data->operation.orientation = 0x3;
 408                 data->operation.operation = 0x16;
 409                 data->count++;
 410                 break;
 411         case DASD_ECKD_CCW_WRITE:
 412         case DASD_ECKD_CCW_WRITE_MT:
 413         case DASD_ECKD_CCW_WRITE_KD:
 414         case DASD_ECKD_CCW_WRITE_KD_MT:
 415                 data->auxiliary.length_valid = 0x1;
 416                 data->length = reclen;
 417                 data->operation.operation = 0x01;
 418                 break;
 419         case DASD_ECKD_CCW_WRITE_CKD:
 420         case DASD_ECKD_CCW_WRITE_CKD_MT:
 421                 data->auxiliary.length_valid = 0x1;
 422                 data->length = reclen;
 423                 data->operation.operation = 0x03;
 424                 break;
 425         case DASD_ECKD_CCW_WRITE_FULL_TRACK:
 426                 data->operation.orientation = 0x0;
 427                 data->operation.operation = 0x3F;
 428                 data->extended_operation = 0x11;
 429                 data->length = 0;
 430                 data->extended_parameter_length = 0x02;
 431                 if (data->count > 8) {
 432                         data->extended_parameter[0] = 0xFF;
 433                         data->extended_parameter[1] = 0xFF;
 434                         data->extended_parameter[1] <<= (16 - count);
 435                 } else {
 436                         data->extended_parameter[0] = 0xFF;
 437                         data->extended_parameter[0] <<= (8 - count);
 438                         data->extended_parameter[1] = 0x00;
 439                 }
 440                 data->sector = 0xFF;
 441                 break;
 442         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 443                 data->auxiliary.length_valid = 0x1;
 444                 data->length = reclen;  /* not tlf, as one might think */
 445                 data->operation.operation = 0x3F;
 446                 data->extended_operation = 0x23;
 447                 break;
 448         case DASD_ECKD_CCW_READ:
 449         case DASD_ECKD_CCW_READ_MT:
 450         case DASD_ECKD_CCW_READ_KD:
 451         case DASD_ECKD_CCW_READ_KD_MT:
 452                 data->auxiliary.length_valid = 0x1;
 453                 data->length = reclen;
 454                 data->operation.operation = 0x06;
 455                 break;
 456         case DASD_ECKD_CCW_READ_CKD:
 457         case DASD_ECKD_CCW_READ_CKD_MT:
 458                 data->auxiliary.length_valid = 0x1;
 459                 data->length = reclen;
 460                 data->operation.operation = 0x16;
 461                 break;
 462         case DASD_ECKD_CCW_READ_COUNT:
 463                 data->operation.operation = 0x06;
 464                 break;
 465         case DASD_ECKD_CCW_READ_TRACK:
 466                 data->operation.orientation = 0x1;
 467                 data->operation.operation = 0x0C;
 468                 data->extended_parameter_length = 0;
 469                 data->sector = 0xFF;
 470                 break;
 471         case DASD_ECKD_CCW_READ_TRACK_DATA:
 472                 data->auxiliary.length_valid = 0x1;
 473                 data->length = tlf;
 474                 data->operation.operation = 0x0C;
 475                 break;
 476         case DASD_ECKD_CCW_ERASE:
 477                 data->length = reclen;
 478                 data->auxiliary.length_valid = 0x1;
 479                 data->operation.operation = 0x0b;
 480                 break;
 481         default:
 482                 DBF_DEV_EVENT(DBF_ERR, device,
 483                             "fill LRE unknown opcode 0x%x", cmd);
 484                 BUG();
 485         }
 486         set_ch_t(&data->seek_addr,
 487                  trk / private->rdc_data.trk_per_cyl,
 488                  trk % private->rdc_data.trk_per_cyl);
 489         data->search_arg.cyl = data->seek_addr.cyl;
 490         data->search_arg.head = data->seek_addr.head;
 491         data->search_arg.record = rec_on_trk;
 492 }
 493
 494 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 495                       unsigned int trk, unsigned int totrk, int cmd,
 496                       struct dasd_device *basedev, struct dasd_device *startdev,
 497                       unsigned int format, unsigned int rec_on_trk, int count,
 498                       unsigned int blksize, unsigned int tlf)
 499 {
 500         struct dasd_eckd_private *basepriv, *startpriv;
 501         struct LRE_eckd_data *lredata;
 502         struct DE_eckd_data *dedata;
 503         int rc = 0;
 504
 505         basepriv = basedev->private;
 506         startpriv = startdev->private;
 507         dedata = &pfxdata->define_extent;
 508         lredata = &pfxdata->locate_record;
 509
 510         ccw->cmd_code = DASD_ECKD_CCW_PFX;
 511         ccw->flags = 0;
 512         if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) {
 513                 ccw->count = sizeof(*pfxdata) + 2;
 514                 ccw->cda = (__u32) __pa(pfxdata);
 515                 memset(pfxdata, 0, sizeof(*pfxdata) + 2);
 516         } else {
 517                 ccw->count = sizeof(*pfxdata);
 518                 ccw->cda = (__u32) __pa(pfxdata);
 519                 memset(pfxdata, 0, sizeof(*pfxdata));
 520         }
 521
 522         /* prefix data */
 523         if (format > 1) {
 524                 DBF_DEV_EVENT(DBF_ERR, basedev,
 525                               "PFX LRE unknown format 0x%x", format);
 526                 BUG();
 527                 return -EINVAL;
 528         }
 529         pfxdata->format = format;
 530         pfxdata->base_address = basepriv->ned->unit_addr;
 531         pfxdata->base_lss = basepriv->ned->ID;
 532         pfxdata->validity.define_extent = 1;
 533
 534         /* private uid is kept up to date, conf_data may be outdated */
 535         if (startpriv->uid.type == UA_BASE_PAV_ALIAS)
 536                 pfxdata->validity.verify_base = 1;
 537
 538         if (startpriv->uid.type == UA_HYPER_PAV_ALIAS) {
 539                 pfxdata->validity.verify_base = 1;
 540                 pfxdata->validity.hyper_pav = 1;
 541         }
 542
 543         rc = define_extent(NULL, dedata, trk, totrk, cmd, basedev, blksize);
 544
 545         /*
 546          * For some commands the System Time Stamp is set in the define extent
 547          * data when XRC is supported. The validity of the time stamp must be
 548          * reflected in the prefix data as well.
 549          */
 550         if (dedata->ga_extended & 0x08 && dedata->ga_extended & 0x02)
 551                 pfxdata->validity.time_stamp = 1; /* 'Time Stamp Valid'   */
 552
 553         if (format == 1) {
 554                 locate_record_ext(NULL, lredata, trk, rec_on_trk, count, cmd,
 555                                   basedev, blksize, tlf);
 556         }
 557
 558         return rc;
 559 }
 560
 561 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 562                   unsigned int trk, unsigned int totrk, int cmd,
 563                   struct dasd_device *basedev, struct dasd_device *startdev)
 564 {
 565         return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
 566                           0, 0, 0, 0, 0);
 567 }
 568
 569 static void
 570 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
 571               unsigned int rec_on_trk, int no_rec, int cmd,
 572               struct dasd_device * device, int reclen)
 573 {
 574         struct dasd_eckd_private *private = device->private;
 575         int sector;
 576         int dn, d;
 577
 578         DBF_DEV_EVENT(DBF_INFO, device,
 579                   "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
 580                   trk, rec_on_trk, no_rec, cmd, reclen);
 581
 582         ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
 583         ccw->flags = 0;
 584         ccw->count = 16;
 585         ccw->cda = (__u32) __pa(data);
 586
 587         memset(data, 0, sizeof(struct LO_eckd_data));
 588         sector = 0;
 589         if (rec_on_trk) {
 590                 switch (private->rdc_data.dev_type) {
 591                 case 0x3390:
 592                         dn = ceil_quot(reclen + 6, 232);
 593                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 594                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 595                         break;
 596                 case 0x3380:
 597                         d = 7 + ceil_quot(reclen + 12, 32);
 598                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 599                         break;
 600                 }
 601         }
 602         data->sector = sector;
 603         data->count = no_rec;
 604         switch (cmd) {
 605         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 606                 data->operation.orientation = 0x3;
 607                 data->operation.operation = 0x03;
 608                 break;
 609         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 610                 data->operation.orientation = 0x3;
 611                 data->operation.operation = 0x16;
 612                 break;
 613         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 614                 data->operation.orientation = 0x1;
 615                 data->operation.operation = 0x03;
 616                 data->count++;
 617                 break;
 618         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 619                 data->operation.orientation = 0x3;
 620                 data->operation.operation = 0x16;
 621                 data->count++;
 622                 break;
 623         case DASD_ECKD_CCW_WRITE:
 624         case DASD_ECKD_CCW_WRITE_MT:
 625         case DASD_ECKD_CCW_WRITE_KD:
 626         case DASD_ECKD_CCW_WRITE_KD_MT:
 627                 data->auxiliary.last_bytes_used = 0x1;
 628                 data->length = reclen;
 629                 data->operation.operation = 0x01;
 630                 break;
 631         case DASD_ECKD_CCW_WRITE_CKD:
 632         case DASD_ECKD_CCW_WRITE_CKD_MT:
 633                 data->auxiliary.last_bytes_used = 0x1;
 634                 data->length = reclen;
 635                 data->operation.operation = 0x03;
 636                 break;
 637         case DASD_ECKD_CCW_READ:
 638         case DASD_ECKD_CCW_READ_MT:
 639         case DASD_ECKD_CCW_READ_KD:
 640         case DASD_ECKD_CCW_READ_KD_MT:
 641                 data->auxiliary.last_bytes_used = 0x1;
 642                 data->length = reclen;
 643                 data->operation.operation = 0x06;
 644                 break;
 645         case DASD_ECKD_CCW_READ_CKD:
 646         case DASD_ECKD_CCW_READ_CKD_MT:
 647                 data->auxiliary.last_bytes_used = 0x1;
 648                 data->length = reclen;
 649                 data->operation.operation = 0x16;
 650                 break;
 651         case DASD_ECKD_CCW_READ_COUNT:
 652                 data->operation.operation = 0x06;
 653                 break;
 654         case DASD_ECKD_CCW_ERASE:
 655                 data->length = reclen;
 656                 data->auxiliary.last_bytes_used = 0x1;
 657                 data->operation.operation = 0x0b;
 658                 break;
 659         default:
 660                 DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
 661                               "opcode 0x%x", cmd);
 662         }
 663         set_ch_t(&data->seek_addr,
 664                  trk / private->rdc_data.trk_per_cyl,
 665                  trk % private->rdc_data.trk_per_cyl);
 666         data->search_arg.cyl = data->seek_addr.cyl;
 667         data->search_arg.head = data->seek_addr.head;
 668         data->search_arg.record = rec_on_trk;
 669 }
 670
 671 /*
 672  * Returns 1 if the block is one of the special blocks that needs
 673  * to get read/written with the KD variant of the command.
 674  * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
 675  * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
 676  * Luckily the KD variants differ only by one bit (0x08) from the
 677  * normal variant. So don't wonder about code like:
 678  * if (dasd_eckd_cdl_special(blk_per_trk, recid))
 679  *         ccw->cmd_code |= 0x8;
 680  */
 681 static inline int
 682 dasd_eckd_cdl_special(int blk_per_trk, int recid)
 683 {
 684         if (recid < 3)
 685                 return 1;
 686         if (recid < blk_per_trk)
 687                 return 0;
 688         if (recid < 2 * blk_per_trk)
 689                 return 1;
 690         return 0;
 691 }
 692
 693 /*
 694  * Returns the record size for the special blocks of the cdl format.
 695  * Only returns something useful if dasd_eckd_cdl_special is true
 696  * for the recid.
 697  */
 698 static inline int
 699 dasd_eckd_cdl_reclen(int recid)
 700 {
 701         if (recid < 3)
 702                 return sizes_trk0[recid];
 703         return LABEL_SIZE;
 704 }
 705 /* create unique id from private structure. */
 706 static void create_uid(struct dasd_eckd_private *private)
 707 {
 708         int count;
 709         struct dasd_uid *uid;
 710
 711         uid = &private->uid;
 712         memset(uid, 0, sizeof(struct dasd_uid));
 713         memcpy(uid->vendor, private->ned->HDA_manufacturer,
 714                sizeof(uid->vendor) - 1);
 715         EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
 716         memcpy(uid->serial, private->ned->HDA_location,
 717                sizeof(uid->serial) - 1);
 718         EBCASC(uid->serial, sizeof(uid->serial) - 1);
 719         uid->ssid = private->gneq->subsystemID;
 720         uid->real_unit_addr = private->ned->unit_addr;
 721         if (private->sneq) {
 722                 uid->type = private->sneq->sua_flags;
 723                 if (uid->type == UA_BASE_PAV_ALIAS)
 724                         uid->base_unit_addr = private->sneq->base_unit_addr;
 725         } else {
 726                 uid->type = UA_BASE_DEVICE;
 727         }
 728         if (private->vdsneq) {
 729                 for (count = 0; count < 16; count++) {
 730                         sprintf(uid->vduit+2*count, "%02x",
 731                                 private->vdsneq->uit[count]);
 732                 }
 733         }
 734 }
 735
 736 /*
 737  * Generate device unique id that specifies the physical device.
 738  */
 739 static int dasd_eckd_generate_uid(struct dasd_device *device)
 740 {
 741         struct dasd_eckd_private *private = device->private;
 742         unsigned long flags;
 743
 744         if (!private)
 745                 return -ENODEV;
 746         if (!private->ned || !private->gneq)
 747                 return -ENODEV;
 748         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 749         create_uid(private);
 750         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 751         return 0;
 752 }
 753
 754 static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
 755 {
 756         struct dasd_eckd_private *private = device->private;
 757         unsigned long flags;
 758
 759         if (private) {
 760                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 761                 *uid = private->uid;
 762                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 763                 return 0;
 764         }
 765         return -EINVAL;
 766 }
 767
 768 /*
 769  * compare device UID with data of a given dasd_eckd_private structure
 770  * return 0 for match
 771  */
 772 static int dasd_eckd_compare_path_uid(struct dasd_device *device,
 773                                       struct dasd_eckd_private *private)
 774 {
 775         struct dasd_uid device_uid;
 776
 777         create_uid(private);
 778         dasd_eckd_get_uid(device, &device_uid);
 779
 780         return memcmp(&device_uid, &private->uid, sizeof(struct dasd_uid));
 781 }
 782
 783 static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device,
 784                                    struct dasd_ccw_req *cqr,
 785                                    __u8 *rcd_buffer,
 786                                    __u8 lpm)
 787 {
 788         struct ccw1 *ccw;
 789         /*
 790          * buffer has to start with EBCDIC "V1.0" to show
 791          * support for virtual device SNEQ
 792          */
 793         rcd_buffer[0] = 0xE5;
 794         rcd_buffer[1] = 0xF1;
 795         rcd_buffer[2] = 0x4B;
 796         rcd_buffer[3] = 0xF0;
 797
 798         ccw = cqr->cpaddr;
 799         ccw->cmd_code = DASD_ECKD_CCW_RCD;
 800         ccw->flags = 0;
 801         ccw->cda = (__u32)(addr_t)rcd_buffer;
 802         ccw->count = DASD_ECKD_RCD_DATA_SIZE;
 803         cqr->magic = DASD_ECKD_MAGIC;
 804
 805         cqr->startdev = device;
 806         cqr->memdev = device;
 807         cqr->block = NULL;
 808         cqr->expires = 10*HZ;
 809         cqr->lpm = lpm;
 810         cqr->retries = 256;
 811         cqr->buildclk = get_tod_clock();
 812         cqr->status = DASD_CQR_FILLED;
 813         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
 814 }
 815
 816 /*
 817  * Wakeup helper for read_conf
 818  * if the cqr is not done and needs some error recovery
 819  * the buffer has to be re-initialized with the EBCDIC "V1.0"
 820  * to show support for virtual device SNEQ
 821  */
 822 static void read_conf_cb(struct dasd_ccw_req *cqr, void *data)
 823 {
 824         struct ccw1 *ccw;
 825         __u8 *rcd_buffer;
 826
 827         if (cqr->status !=  DASD_CQR_DONE) {
 828                 ccw = cqr->cpaddr;
 829                 rcd_buffer = (__u8 *)((addr_t) ccw->cda);
 830                 memset(rcd_buffer, 0, sizeof(*rcd_buffer));
 831
 832                 rcd_buffer[0] = 0xE5;
 833                 rcd_buffer[1] = 0xF1;
 834                 rcd_buffer[2] = 0x4B;
 835                 rcd_buffer[3] = 0xF0;
 836         }
 837         dasd_wakeup_cb(cqr, data);
 838 }
 839
 840 static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
 841                                            struct dasd_ccw_req *cqr,
 842                                            __u8 *rcd_buffer,
 843                                            __u8 lpm)
 844 {
 845         struct ciw *ciw;
 846         int rc;
 847         /*
 848          * sanity check: scan for RCD command in extended SenseID data
 849          * some devices do not support RCD
 850          */
 851         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 852         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
 853                 return -EOPNOTSUPP;
 854
 855         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
 856         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 857         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
 858         cqr->retries = 5;
 859         cqr->callback = read_conf_cb;
 860         rc = dasd_sleep_on_immediatly(cqr);
 861         return rc;
 862 }
 863
 864 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
 865                                    void **rcd_buffer,
 866                                    int *rcd_buffer_size, __u8 lpm)
 867 {
 868         struct ciw *ciw;
 869         char *rcd_buf = NULL;
 870         int ret;
 871         struct dasd_ccw_req *cqr;
 872
 873         /*
 874          * sanity check: scan for RCD command in extended SenseID data
 875          * some devices do not support RCD
 876          */
 877         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 878         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
 879                 ret = -EOPNOTSUPP;
 880                 goto out_error;
 881         }
 882         rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
 883         if (!rcd_buf) {
 884                 ret = -ENOMEM;
 885                 goto out_error;
 886         }
 887         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
 888                                    0, /* use rcd_buf as data ara */
 889                                    device, NULL);
 890         if (IS_ERR(cqr)) {
 891                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 892                               "Could not allocate RCD request");
 893                 ret = -ENOMEM;
 894                 goto out_error;
 895         }
 896         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
 897         cqr->callback = read_conf_cb;
 898         ret = dasd_sleep_on(cqr);
 899         /*
 900          * on success we update the user input parms
 901          */
 902         dasd_sfree_request(cqr, cqr->memdev);
 903         if (ret)
 904                 goto out_error;
 905
 906         *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
 907         *rcd_buffer = rcd_buf;
 908         return 0;
 909 out_error:
 910         kfree(rcd_buf);
 911         *rcd_buffer = NULL;
 912         *rcd_buffer_size = 0;
 913         return ret;
 914 }
 915
 916 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
 917 {
 918
 919         struct dasd_sneq *sneq;
 920         int i, count;
 921
 922         private->ned = NULL;
 923         private->sneq = NULL;
 924         private->vdsneq = NULL;
 925         private->gneq = NULL;
 926         count = private->conf_len / sizeof(struct dasd_sneq);
 927         sneq = (struct dasd_sneq *)private->conf_data;
 928         for (i = 0; i < count; ++i) {
 929                 if (sneq->flags.identifier == 1 && sneq->format == 1)
 930                         private->sneq = sneq;
 931                 else if (sneq->flags.identifier == 1 && sneq->format == 4)
 932                         private->vdsneq = (struct vd_sneq *)sneq;
 933                 else if (sneq->flags.identifier == 2)
 934                         private->gneq = (struct dasd_gneq *)sneq;
 935                 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
 936                         private->ned = (struct dasd_ned *)sneq;
 937                 sneq++;
 938         }
 939         if (!private->ned || !private->gneq) {
 940                 private->ned = NULL;
 941                 private->sneq = NULL;
 942                 private->vdsneq = NULL;
 943                 private->gneq = NULL;
 944                 return -EINVAL;
 945         }
 946         return 0;
 947
 948 };
 949
 950 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
 951 {
 952         struct dasd_gneq *gneq;
 953         int i, count, found;
 954
 955         count = conf_len / sizeof(*gneq);
 956         gneq = (struct dasd_gneq *)conf_data;
 957         found = 0;
 958         for (i = 0; i < count; ++i) {
 959                 if (gneq->flags.identifier == 2) {
 960                         found = 1;
 961                         break;
 962                 }
 963                 gneq++;
 964         }
 965         if (found)
 966                 return ((char *)gneq)[18] & 0x07;
 967         else
 968                 return 0;
 969 }
 970
 971 static void dasd_eckd_clear_conf_data(struct dasd_device *device)
 972 {
 973         struct dasd_eckd_private *private = device->private;
 974         int i;
 975
 976         private->conf_data = NULL;
 977         private->conf_len = 0;
 978         for (i = 0; i < 8; i++) {
 979                 kfree(device->path[i].conf_data);
 980                 device->path[i].conf_data = NULL;
 981                 device->path[i].cssid = 0;
 982                 device->path[i].ssid = 0;
 983                 device->path[i].chpid = 0;
 984         }
 985 }
 986
 987
 988 static int dasd_eckd_read_conf(struct dasd_device *device)
 989 {
 990         void *conf_data;
 991         int conf_len, conf_data_saved;
 992         int rc, path_err, pos;
 993         __u8 lpm, opm;
 994         struct dasd_eckd_private *private, path_private;
 995         struct dasd_uid *uid;
 996         char print_path_uid[60], print_device_uid[60];
 997         struct channel_path_desc_fmt0 *chp_desc;
 998         struct subchannel_id sch_id;
 999
1000         private = device->private;
1001         opm = ccw_device_get_path_mask(device->cdev);
1002         ccw_device_get_schid(device->cdev, &sch_id);
1003         conf_data_saved = 0;
1004         path_err = 0;
1005         /* get configuration data per operational path */
1006         for (lpm = 0x80; lpm; lpm>>= 1) {
1007                 if (!(lpm & opm))
1008                         continue;
1009                 rc = dasd_eckd_read_conf_lpm(device, &conf_data,
1010                                              &conf_len, lpm);
1011                 if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
1012                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1013                                         "Read configuration data returned "
1014                                         "error %d", rc);
1015                         return rc;
1016                 }
1017                 if (conf_data == NULL) {
1018                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1019                                         "No configuration data "
1020                                         "retrieved");
1021                         /* no further analysis possible */
1022                         dasd_path_add_opm(device, opm);
1023                         continue;       /* no error */
1024                 }
1025                 /* save first valid configuration data */
1026                 if (!conf_data_saved) {
1027                         /* initially clear previously stored conf_data */
1028                         dasd_eckd_clear_conf_data(device);
1029                         private->conf_data = conf_data;
1030                         private->conf_len = conf_len;
1031                         if (dasd_eckd_identify_conf_parts(private)) {
1032                                 private->conf_data = NULL;
1033                                 private->conf_len = 0;
1034                                 kfree(conf_data);
1035                                 continue;
1036                         }
1037                         pos = pathmask_to_pos(lpm);
1038                         /* store per path conf_data */
1039                         device->path[pos].conf_data = conf_data;
1040                         device->path[pos].cssid = sch_id.cssid;
1041                         device->path[pos].ssid = sch_id.ssid;
1042                         chp_desc = ccw_device_get_chp_desc(device->cdev, pos);
1043                         if (chp_desc)
1044                                 device->path[pos].chpid = chp_desc->chpid;
1045                         kfree(chp_desc);
1046                         /*
1047                          * build device UID that other path data
1048                          * can be compared to it
1049                          */
1050                         dasd_eckd_generate_uid(device);
1051                         conf_data_saved++;
1052                 } else {
1053                         path_private.conf_data = conf_data;
1054                         path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1055                         if (dasd_eckd_identify_conf_parts(
1056                                     &path_private)) {
1057                                 path_private.conf_data = NULL;
1058                                 path_private.conf_len = 0;
1059                                 kfree(conf_data);
1060                                 continue;
1061                         }
1062                         if (dasd_eckd_compare_path_uid(
1063                                     device, &path_private)) {
1064                                 uid = &path_private.uid;
1065                                 if (strlen(uid->vduit) > 0)
1066                                         snprintf(print_path_uid,
1067                                                  sizeof(print_path_uid),
1068                                                  "%s.%s.%04x.%02x.%s",
1069                                                  uid->vendor, uid->serial,
1070                                                  uid->ssid, uid->real_unit_addr,
1071                                                  uid->vduit);
1072                                 else
1073                                         snprintf(print_path_uid,
1074                                                  sizeof(print_path_uid),
1075                                                  "%s.%s.%04x.%02x",
1076                                                  uid->vendor, uid->serial,
1077                                                  uid->ssid,
1078                                                  uid->real_unit_addr);
1079                                 uid = &private->uid;
1080                                 if (strlen(uid->vduit) > 0)
1081                                         snprintf(print_device_uid,
1082                                                  sizeof(print_device_uid),
1083                                                  "%s.%s.%04x.%02x.%s",
1084                                                  uid->vendor, uid->serial,
1085                                                  uid->ssid, uid->real_unit_addr,
1086                                                  uid->vduit);
1087                                 else
1088                                         snprintf(print_device_uid,
1089                                                  sizeof(print_device_uid),
1090                                                  "%s.%s.%04x.%02x",
1091                                                  uid->vendor, uid->serial,
1092                                                  uid->ssid,
1093                                                  uid->real_unit_addr);
1094                                 dev_err(&device->cdev->dev,
1095                                         "Not all channel paths lead to "
1096                                         "the same device, path %02X leads to "
1097                                         "device %s instead of %s\n", lpm,
1098                                         print_path_uid, print_device_uid);
1099                                 path_err = -EINVAL;
1100                                 dasd_path_add_cablepm(device, lpm);
1101                                 continue;
1102                         }
1103                         pos = pathmask_to_pos(lpm);
1104                         /* store per path conf_data */
1105                         device->path[pos].conf_data = conf_data;
1106                         device->path[pos].cssid = sch_id.cssid;
1107                         device->path[pos].ssid = sch_id.ssid;
1108                         chp_desc = ccw_device_get_chp_desc(device->cdev, pos);
1109                         if (chp_desc)
1110                                 device->path[pos].chpid = chp_desc->chpid;
1111                         kfree(chp_desc);
1112                         path_private.conf_data = NULL;
1113                         path_private.conf_len = 0;
1114                 }
1115                 switch (dasd_eckd_path_access(conf_data, conf_len)) {
1116                 case 0x02:
1117                         dasd_path_add_nppm(device, lpm);
1118                         break;
1119                 case 0x03:
1120                         dasd_path_add_ppm(device, lpm);
1121                         break;
1122                 }
1123                 if (!dasd_path_get_opm(device)) {
1124                         dasd_path_set_opm(device, lpm);
1125                         dasd_generic_path_operational(device);
1126                 } else {
1127                         dasd_path_add_opm(device, lpm);
1128                 }
1129         }
1130
1131         return path_err;
1132 }
1133
1134 static u32 get_fcx_max_data(struct dasd_device *device)
1135 {
1136         struct dasd_eckd_private *private = device->private;
1137         int fcx_in_css, fcx_in_gneq, fcx_in_features;
1138         int tpm, mdc;
1139
1140         if (dasd_nofcx)
1141                 return 0;
1142         /* is transport mode supported? */
1143         fcx_in_css = css_general_characteristics.fcx;
1144         fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
1145         fcx_in_features = private->features.feature[40] & 0x80;
1146         tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1147
1148         if (!tpm)
1149                 return 0;
1150
1151         mdc = ccw_device_get_mdc(device->cdev, 0);
1152         if (mdc < 0) {
1153                 dev_warn(&device->cdev->dev, "Detecting the maximum supported data size for zHPF requests failed\n");
1154                 return 0;
1155         } else {
1156                 return (u32)mdc * FCX_MAX_DATA_FACTOR;
1157         }
1158 }
1159
1160 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1161 {
1162         struct dasd_eckd_private *private = device->private;
1163         int mdc;
1164         u32 fcx_max_data;
1165
1166         if (private->fcx_max_data) {
1167                 mdc = ccw_device_get_mdc(device->cdev, lpm);
1168                 if ((mdc < 0)) {
1169                         dev_warn(&device->cdev->dev,
1170                                  "Detecting the maximum data size for zHPF "
1171                                  "requests failed (rc=%d) for a new path %x\n",
1172                                  mdc, lpm);
1173                         return mdc;
1174                 }
1175                 fcx_max_data = (u32)mdc * FCX_MAX_DATA_FACTOR;
1176                 if (fcx_max_data < private->fcx_max_data) {
1177                         dev_warn(&device->cdev->dev,
1178                                  "The maximum data size for zHPF requests %u "
1179                                  "on a new path %x is below the active maximum "
1180                                  "%u\n", fcx_max_data, lpm,
1181                                  private->fcx_max_data);
1182                         return -EACCES;
1183                 }
1184         }
1185         return 0;
1186 }
1187
1188 static int rebuild_device_uid(struct dasd_device *device,
1189                               struct path_verification_work_data *data)
1190 {
1191         struct dasd_eckd_private *private = device->private;
1192         __u8 lpm, opm = dasd_path_get_opm(device);
1193         int rc = -ENODEV;
1194
1195         for (lpm = 0x80; lpm; lpm >>= 1) {
1196                 if (!(lpm & opm))
1197                         continue;
1198                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1199                 memset(&data->cqr, 0, sizeof(data->cqr));
1200                 data->cqr.cpaddr = &data->ccw;
1201                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1202                                                      data->rcd_buffer,
1203                                                      lpm);
1204
1205                 if (rc) {
1206                         if (rc == -EOPNOTSUPP) /* -EOPNOTSUPP is ok */
1207                                 continue;
1208                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1209                                         "Read configuration data "
1210                                         "returned error %d", rc);
1211                         break;
1212                 }
1213                 memcpy(private->conf_data, data->rcd_buffer,
1214                        DASD_ECKD_RCD_DATA_SIZE);
1215                 if (dasd_eckd_identify_conf_parts(private)) {
1216                         rc = -ENODEV;
1217                 } else /* first valid path is enough */
1218                         break;
1219         }
1220
1221         if (!rc)
1222                 rc = dasd_eckd_generate_uid(device);
1223
1224         return rc;
1225 }
1226
1227 static void do_path_verification_work(struct work_struct *work)
1228 {
1229         struct path_verification_work_data *data;
1230         struct dasd_device *device;
1231         struct dasd_eckd_private path_private;
1232         struct dasd_uid *uid;
1233         __u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
1234         __u8 lpm, opm, npm, ppm, epm, hpfpm, cablepm;
1235         unsigned long flags;
1236         char print_uid[60];
1237         int rc;
1238
1239         data = container_of(work, struct path_verification_work_data, worker);
1240         device = data->device;
1241
1242         /* delay path verification until device was resumed */
1243         if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
1244                 schedule_work(work);
1245                 return;
1246         }
1247         /* check if path verification already running and delay if so */
1248         if (test_and_set_bit(DASD_FLAG_PATH_VERIFY, &device->flags)) {
1249                 schedule_work(work);
1250                 return;
1251         }
1252         opm = 0;
1253         npm = 0;
1254         ppm = 0;
1255         epm = 0;
1256         hpfpm = 0;
1257         cablepm = 0;
1258
1259         for (lpm = 0x80; lpm; lpm >>= 1) {
1260                 if (!(lpm & data->tbvpm))
1261                         continue;
1262                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1263                 memset(&data->cqr, 0, sizeof(data->cqr));
1264                 data->cqr.cpaddr = &data->ccw;
1265                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1266                                                      data->rcd_buffer,
1267                                                      lpm);
1268                 if (!rc) {
1269                         switch (dasd_eckd_path_access(data->rcd_buffer,
1270                                                       DASD_ECKD_RCD_DATA_SIZE)
1271                                 ) {
1272                         case 0x02:
1273                                 npm |= lpm;
1274                                 break;
1275                         case 0x03:
1276                                 ppm |= lpm;
1277                                 break;
1278                         }
1279                         opm |= lpm;
1280                 } else if (rc == -EOPNOTSUPP) {
1281                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1282                                         "path verification: No configuration "
1283                                         "data retrieved");
1284                         opm |= lpm;
1285                 } else if (rc == -EAGAIN) {
1286                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1287                                         "path verification: device is stopped,"
1288                                         " try again later");
1289                         epm |= lpm;
1290                 } else {
1291                         dev_warn(&device->cdev->dev,
1292                                  "Reading device feature codes failed "
1293                                  "(rc=%d) for new path %x\n", rc, lpm);
1294                         continue;
1295                 }
1296                 if (verify_fcx_max_data(device, lpm)) {
1297                         opm &= ~lpm;
1298                         npm &= ~lpm;
1299                         ppm &= ~lpm;
1300                         hpfpm |= lpm;
1301                         continue;
1302                 }
1303
1304                 /*
1305                  * save conf_data for comparison after
1306                  * rebuild_device_uid may have changed
1307                  * the original data
1308                  */
1309                 memcpy(&path_rcd_buf, data->rcd_buffer,
1310                        DASD_ECKD_RCD_DATA_SIZE);
1311                 path_private.conf_data = (void *) &path_rcd_buf;
1312                 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1313                 if (dasd_eckd_identify_conf_parts(&path_private)) {
1314                         path_private.conf_data = NULL;
1315                         path_private.conf_len = 0;
1316                         continue;
1317                 }
1318
1319                 /*
1320                  * compare path UID with device UID only if at least
1321                  * one valid path is left
1322                  * in other case the device UID may have changed and
1323                  * the first working path UID will be used as device UID
1324                  */
1325                 if (dasd_path_get_opm(device) &&
1326                     dasd_eckd_compare_path_uid(device, &path_private)) {
1327                         /*
1328                          * the comparison was not successful
1329                          * rebuild the device UID with at least one
1330                          * known path in case a z/VM hyperswap command
1331                          * has changed the device
1332                          *
1333                          * after this compare again
1334                          *
1335                          * if either the rebuild or the recompare fails
1336                          * the path can not be used
1337                          */
1338                         if (rebuild_device_uid(device, data) ||
1339                             dasd_eckd_compare_path_uid(
1340                                     device, &path_private)) {
1341                                 uid = &path_private.uid;
1342                                 if (strlen(uid->vduit) > 0)
1343                                         snprintf(print_uid, sizeof(print_uid),
1344                                                  "%s.%s.%04x.%02x.%s",
1345                                                  uid->vendor, uid->serial,
1346                                                  uid->ssid, uid->real_unit_addr,
1347                                                  uid->vduit);
1348                                 else
1349                                         snprintf(print_uid, sizeof(print_uid),
1350                                                  "%s.%s.%04x.%02x",
1351                                                  uid->vendor, uid->serial,
1352                                                  uid->ssid,
1353                                                  uid->real_unit_addr);
1354                                 dev_err(&device->cdev->dev,
1355                                         "The newly added channel path %02X "
1356                                         "will not be used because it leads "
1357                                         "to a different device %s\n",
1358                                         lpm, print_uid);
1359                                 opm &= ~lpm;
1360                                 npm &= ~lpm;
1361                                 ppm &= ~lpm;
1362                                 cablepm |= lpm;
1363                                 continue;
1364                         }
1365                 }
1366
1367                 /*
1368                  * There is a small chance that a path is lost again between
1369                  * above path verification and the following modification of
1370                  * the device opm mask. We could avoid that race here by using
1371                  * yet another path mask, but we rather deal with this unlikely
1372                  * situation in dasd_start_IO.
1373                  */
1374                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1375                 if (!dasd_path_get_opm(device) && opm) {
1376                         dasd_path_set_opm(device, opm);
1377                         dasd_generic_path_operational(device);
1378                 } else {
1379                         dasd_path_add_opm(device, opm);
1380                 }
1381                 dasd_path_add_nppm(device, npm);
1382                 dasd_path_add_ppm(device, ppm);
1383                 dasd_path_add_tbvpm(device, epm);
1384                 dasd_path_add_cablepm(device, cablepm);
1385                 dasd_path_add_nohpfpm(device, hpfpm);
1386                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1387         }
1388         clear_bit(DASD_FLAG_PATH_VERIFY, &device->flags);
1389         dasd_put_device(device);
1390         if (data->isglobal)
1391                 mutex_unlock(&dasd_path_verification_mutex);
1392         else
1393                 kfree(data);
1394 }
1395
1396 static int dasd_eckd_verify_path(struct dasd_device *device, __u8 lpm)
1397 {
1398         struct path_verification_work_data *data;
1399
1400         data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1401         if (!data) {
1402                 if (mutex_trylock(&dasd_path_verification_mutex)) {
1403                         data = path_verification_worker;
1404                         data->isglobal = 1;
1405                 } else
1406                         return -ENOMEM;
1407         } else {
1408                 memset(data, 0, sizeof(*data));
1409                 data->isglobal = 0;
1410         }
1411         INIT_WORK(&data->worker, do_path_verification_work);
1412         dasd_get_device(device);
1413         data->device = device;
1414         data->tbvpm = lpm;
1415         schedule_work(&data->worker);
1416         return 0;
1417 }
1418
1419 static void dasd_eckd_reset_path(struct dasd_device *device, __u8 pm)
1420 {
1421         struct dasd_eckd_private *private = device->private;
1422         unsigned long flags;
1423
1424         if (!private->fcx_max_data)
1425                 private->fcx_max_data = get_fcx_max_data(device);
1426         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1427         dasd_path_set_tbvpm(device, pm ? : dasd_path_get_notoperpm(device));
1428         dasd_schedule_device_bh(device);
1429         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1430 }
1431
1432 static int dasd_eckd_read_features(struct dasd_device *device)
1433 {
1434         struct dasd_eckd_private *private = device->private;
1435         struct dasd_psf_prssd_data *prssdp;
1436         struct dasd_rssd_features *features;
1437         struct dasd_ccw_req *cqr;
1438         struct ccw1 *ccw;
1439         int rc;
1440
1441         memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1442         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1443                                    (sizeof(struct dasd_psf_prssd_data) +
1444                                     sizeof(struct dasd_rssd_features)),
1445                                    device, NULL);
1446         if (IS_ERR(cqr)) {
1447                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1448                                 "allocate initialization request");
1449                 return PTR_ERR(cqr);
1450         }
1451         cqr->startdev = device;
1452         cqr->memdev = device;
1453         cqr->block = NULL;
1454         cqr->retries = 256;
1455         cqr->expires = 10 * HZ;
1456
1457         /* Prepare for Read Subsystem Data */
1458         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1459         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1460         prssdp->order = PSF_ORDER_PRSSD;
1461         prssdp->suborder = 0x41;        /* Read Feature Codes */
1462         /* all other bytes of prssdp must be zero */
1463
1464         ccw = cqr->cpaddr;
1465         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1466         ccw->count = sizeof(struct dasd_psf_prssd_data);
1467         ccw->flags |= CCW_FLAG_CC;
1468         ccw->cda = (__u32)(addr_t) prssdp;
1469
1470         /* Read Subsystem Data - feature codes */
1471         features = (struct dasd_rssd_features *) (prssdp + 1);
1472         memset(features, 0, sizeof(struct dasd_rssd_features));
1473
1474         ccw++;
1475         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1476         ccw->count = sizeof(struct dasd_rssd_features);
1477         ccw->cda = (__u32)(addr_t) features;
1478
1479         cqr->buildclk = get_tod_clock();
1480         cqr->status = DASD_CQR_FILLED;
1481         rc = dasd_sleep_on(cqr);
1482         if (rc == 0) {
1483                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1484                 features = (struct dasd_rssd_features *) (prssdp + 1);
1485                 memcpy(&private->features, features,
1486                        sizeof(struct dasd_rssd_features));
1487         } else
1488                 dev_warn(&device->cdev->dev, "Reading device feature codes"
1489                          " failed with rc=%d\n", rc);
1490         dasd_sfree_request(cqr, cqr->memdev);
1491         return rc;
1492 }
1493
1494
1495 /*
1496  * Build CP for Perform Subsystem Function - SSC.
1497  */
1498 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1499                                                     int enable_pav)
1500 {
1501         struct dasd_ccw_req *cqr;
1502         struct dasd_psf_ssc_data *psf_ssc_data;
1503         struct ccw1 *ccw;
1504
1505         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1506                                   sizeof(struct dasd_psf_ssc_data),
1507                                    device, NULL);
1508
1509         if (IS_ERR(cqr)) {
1510                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1511                            "Could not allocate PSF-SSC request");
1512                 return cqr;
1513         }
1514         psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1515         psf_ssc_data->order = PSF_ORDER_SSC;
1516         psf_ssc_data->suborder = 0xc0;
1517         if (enable_pav) {
1518                 psf_ssc_data->suborder |= 0x08;
1519                 psf_ssc_data->reserved[0] = 0x88;
1520         }
1521         ccw = cqr->cpaddr;
1522         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1523         ccw->cda = (__u32)(addr_t)psf_ssc_data;
1524         ccw->count = 66;
1525
1526         cqr->startdev = device;
1527         cqr->memdev = device;
1528         cqr->block = NULL;
1529         cqr->retries = 256;
1530         cqr->expires = 10*HZ;
1531         cqr->buildclk = get_tod_clock();
1532         cqr->status = DASD_CQR_FILLED;
1533         return cqr;
1534 }
1535
1536 /*
1537  * Perform Subsystem Function.
1538  * It is necessary to trigger CIO for channel revalidation since this
1539  * call might change behaviour of DASD devices.
1540  */
1541 static int
1542 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav,
1543                   unsigned long flags)
1544 {
1545         struct dasd_ccw_req *cqr;
1546         int rc;
1547
1548         cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1549         if (IS_ERR(cqr))
1550                 return PTR_ERR(cqr);
1551
1552         /*
1553          * set flags e.g. turn on failfast, to prevent blocking
1554          * the calling function should handle failed requests
1555          */
1556         cqr->flags |= flags;
1557
1558         rc = dasd_sleep_on(cqr);
1559         if (!rc)
1560                 /* trigger CIO to reprobe devices */
1561                 css_schedule_reprobe();
1562         else if (cqr->intrc == -EAGAIN)
1563                 rc = -EAGAIN;
1564
1565         dasd_sfree_request(cqr, cqr->memdev);
1566         return rc;
1567 }
1568
1569 /*
1570  * Valide storage server of current device.
1571  */
1572 static int dasd_eckd_validate_server(struct dasd_device *device,
1573                                      unsigned long flags)
1574 {
1575         struct dasd_eckd_private *private = device->private;
1576         int enable_pav, rc;
1577
1578         if (private->uid.type == UA_BASE_PAV_ALIAS ||
1579             private->uid.type == UA_HYPER_PAV_ALIAS)
1580                 return 0;
1581         if (dasd_nopav || MACHINE_IS_VM)
1582                 enable_pav = 0;
1583         else
1584                 enable_pav = 1;
1585         rc = dasd_eckd_psf_ssc(device, enable_pav, flags);
1586
1587         /* may be requested feature is not available on server,
1588          * therefore just report error and go ahead */
1589         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1590                         "returned rc=%d", private->uid.ssid, rc);
1591         return rc;
1592 }
1593
1594 /*
1595  * worker to do a validate server in case of a lost pathgroup
1596  */
1597 static void dasd_eckd_do_validate_server(struct work_struct *work)
1598 {
1599         struct dasd_device *device = container_of(work, struct dasd_device,
1600                                                   kick_validate);
1601         unsigned long flags = 0;
1602
1603         set_bit(DASD_CQR_FLAGS_FAILFAST, &flags);
1604         if (dasd_eckd_validate_server(device, flags)
1605             == -EAGAIN) {
1606                 /* schedule worker again if failed */
1607                 schedule_work(&device->kick_validate);
1608                 return;
1609         }
1610
1611         dasd_put_device(device);
1612 }
1613
1614 static void dasd_eckd_kick_validate_server(struct dasd_device *device)
1615 {
1616         dasd_get_device(device);
1617         /* exit if device not online or in offline processing */
1618         if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1619            device->state < DASD_STATE_ONLINE) {
1620                 dasd_put_device(device);
1621                 return;
1622         }
1623         /* queue call to do_validate_server to the kernel event daemon. */
1624         if (!schedule_work(&device->kick_validate))
1625                 dasd_put_device(device);
1626 }
1627
1628 /*
1629  * Check device characteristics.
1630  * If the device is accessible using ECKD discipline, the device is enabled.
1631  */
1632 static int
1633 dasd_eckd_check_characteristics(struct dasd_device *device)
1634 {
1635         struct dasd_eckd_private *private = device->private;
1636         struct dasd_block *block;
1637         struct dasd_uid temp_uid;
1638         int rc, i;
1639         int readonly;
1640         unsigned long value;
1641
1642         /* setup work queue for validate server*/
1643         INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
1644         /* setup work queue for summary unit check */
1645         INIT_WORK(&device->suc_work, dasd_alias_handle_summary_unit_check);
1646
1647         if (!ccw_device_is_pathgroup(device->cdev)) {
1648                 dev_warn(&device->cdev->dev,
1649                          "A channel path group could not be established\n");
1650                 return -EIO;
1651         }
1652         if (!ccw_device_is_multipath(device->cdev)) {
1653                 dev_info(&device->cdev->dev,
1654                          "The DASD is not operating in multipath mode\n");
1655         }
1656         if (!private) {
1657                 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1658                 if (!private) {
1659                         dev_warn(&device->cdev->dev,
1660                                  "Allocating memory for private DASD data "
1661                                  "failed\n");
1662                         return -ENOMEM;
1663                 }
1664                 device->private = private;
1665         } else {
1666                 memset(private, 0, sizeof(*private));
1667         }
1668         /* Invalidate status of initial analysis. */
1669         private->init_cqr_status = -1;
1670         /* Set default cache operations. */
1671         private->attrib.operation = DASD_NORMAL_CACHE;
1672         private->attrib.nr_cyl = 0;
1673
1674         /* Read Configuration Data */
1675         rc = dasd_eckd_read_conf(device);
1676         if (rc)
1677                 goto out_err1;
1678
1679         /* set some default values */
1680         device->default_expires = DASD_EXPIRES;
1681         device->default_retries = DASD_RETRIES;
1682         device->path_thrhld = DASD_ECKD_PATH_THRHLD;
1683         device->path_interval = DASD_ECKD_PATH_INTERVAL;
1684
1685         if (private->gneq) {
1686                 value = 1;
1687                 for (i = 0; i < private->gneq->timeout.value; i++)
1688                         value = 10 * value;
1689                 value = value * private->gneq->timeout.number;
1690                 /* do not accept useless values */
1691                 if (value != 0 && value <= DASD_EXPIRES_MAX)
1692                         device->default_expires = value;
1693         }
1694
1695         dasd_eckd_get_uid(device, &temp_uid);
1696         if (temp_uid.type == UA_BASE_DEVICE) {
1697                 block = dasd_alloc_block();
1698                 if (IS_ERR(block)) {
1699                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1700                                         "could not allocate dasd "
1701                                         "block structure");
1702                         rc = PTR_ERR(block);
1703                         goto out_err1;
1704                 }
1705                 device->block = block;
1706                 block->base = device;
1707         }
1708
1709         /* register lcu with alias handling, enable PAV */
1710         rc = dasd_alias_make_device_known_to_lcu(device);
1711         if (rc)
1712                 goto out_err2;
1713
1714         dasd_eckd_validate_server(device, 0);
1715
1716         /* device may report different configuration data after LCU setup */
1717         rc = dasd_eckd_read_conf(device);
1718         if (rc)
1719                 goto out_err3;
1720
1721         /* Read Feature Codes */
1722         dasd_eckd_read_features(device);
1723
1724         /* Read Device Characteristics */
1725         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
1726                                          &private->rdc_data, 64);
1727         if (rc) {
1728                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1729                                 "Read device characteristic failed, rc=%d", rc);
1730                 goto out_err3;
1731         }
1732
1733         if ((device->features & DASD_FEATURE_USERAW) &&
1734             !(private->rdc_data.facilities.RT_in_LR)) {
1735                 dev_err(&device->cdev->dev, "The storage server does not "
1736                         "support raw-track access\n");
1737                 rc = -EINVAL;
1738                 goto out_err3;
1739         }
1740
1741         /* find the valid cylinder size */
1742         if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1743             private->rdc_data.long_no_cyl)
1744                 private->real_cyl = private->rdc_data.long_no_cyl;
1745         else
1746                 private->real_cyl = private->rdc_data.no_cyl;
1747
1748         private->fcx_max_data = get_fcx_max_data(device);
1749
1750         readonly = dasd_device_is_ro(device);
1751         if (readonly)
1752                 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
1753
1754         dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1755                  "with %d cylinders, %d heads, %d sectors%s\n",
1756                  private->rdc_data.dev_type,
1757                  private->rdc_data.dev_model,
1758                  private->rdc_data.cu_type,
1759                  private->rdc_data.cu_model.model,
1760                  private->real_cyl,
1761                  private->rdc_data.trk_per_cyl,
1762                  private->rdc_data.sec_per_trk,
1763                  readonly ? ", read-only device" : "");
1764         return 0;
1765
1766 out_err3:
1767         dasd_alias_disconnect_device_from_lcu(device);
1768 out_err2:
1769         dasd_free_block(device->block);
1770         device->block = NULL;
1771 out_err1:
1772         kfree(private->conf_data);
1773         kfree(device->private);
1774         device->private = NULL;
1775         return rc;
1776 }
1777
1778 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1779 {
1780         struct dasd_eckd_private *private = device->private;
1781         int i;
1782
1783         if (!private)
1784                 return;
1785
1786         dasd_alias_disconnect_device_from_lcu(device);
1787         private->ned = NULL;
1788         private->sneq = NULL;
1789         private->vdsneq = NULL;
1790         private->gneq = NULL;
1791         private->conf_len = 0;
1792         for (i = 0; i < 8; i++) {
1793                 kfree(device->path[i].conf_data);
1794                 if ((__u8 *)device->path[i].conf_data ==
1795                     private->conf_data) {
1796                         private->conf_data = NULL;
1797                         private->conf_len = 0;
1798                 }
1799                 device->path[i].conf_data = NULL;
1800                 device->path[i].cssid = 0;
1801                 device->path[i].ssid = 0;
1802                 device->path[i].chpid = 0;
1803         }
1804         kfree(private->conf_data);
1805         private->conf_data = NULL;
1806 }
1807
1808 static struct dasd_ccw_req *
1809 dasd_eckd_analysis_ccw(struct dasd_device *device)
1810 {
1811         struct dasd_eckd_private *private = device->private;
1812         struct eckd_count *count_data;
1813         struct LO_eckd_data *LO_data;
1814         struct dasd_ccw_req *cqr;
1815         struct ccw1 *ccw;
1816         int cplength, datasize;
1817         int i;
1818
1819         cplength = 8;
1820         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1821         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device,
1822                                    NULL);
1823         if (IS_ERR(cqr))
1824                 return cqr;
1825         ccw = cqr->cpaddr;
1826         /* Define extent for the first 3 tracks. */
1827         define_extent(ccw++, cqr->data, 0, 2,
1828                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1829         LO_data = cqr->data + sizeof(struct DE_eckd_data);
1830         /* Locate record for the first 4 records on track 0. */
1831         ccw[-1].flags |= CCW_FLAG_CC;
1832         locate_record(ccw++, LO_data++, 0, 0, 4,
1833                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1834
1835         count_data = private->count_area;
1836         for (i = 0; i < 4; i++) {
1837                 ccw[-1].flags |= CCW_FLAG_CC;
1838                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1839                 ccw->flags = 0;
1840                 ccw->count = 8;
1841                 ccw->cda = (__u32)(addr_t) count_data;
1842                 ccw++;
1843                 count_data++;
1844         }
1845
1846         /* Locate record for the first record on track 2. */
1847         ccw[-1].flags |= CCW_FLAG_CC;
1848         locate_record(ccw++, LO_data++, 2, 0, 1,
1849                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1850         /* Read count ccw. */
1851         ccw[-1].flags |= CCW_FLAG_CC;
1852         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1853         ccw->flags = 0;
1854         ccw->count = 8;
1855         ccw->cda = (__u32)(addr_t) count_data;
1856
1857         cqr->block = NULL;
1858         cqr->startdev = device;
1859         cqr->memdev = device;
1860         cqr->retries = 255;
1861         cqr->buildclk = get_tod_clock();
1862         cqr->status = DASD_CQR_FILLED;
1863         return cqr;
1864 }
1865
1866 /* differentiate between 'no record found' and any other error */
1867 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
1868 {
1869         char *sense;
1870         if (init_cqr->status == DASD_CQR_DONE)
1871                 return INIT_CQR_OK;
1872         else if (init_cqr->status == DASD_CQR_NEED_ERP ||
1873                  init_cqr->status == DASD_CQR_FAILED) {
1874                 sense = dasd_get_sense(&init_cqr->irb);
1875                 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
1876                         return INIT_CQR_UNFORMATTED;
1877                 else
1878                         return INIT_CQR_ERROR;
1879         } else
1880                 return INIT_CQR_ERROR;
1881 }
1882
1883 /*
1884  * This is the callback function for the init_analysis cqr. It saves
1885  * the status of the initial analysis ccw before it frees it and kicks
1886  * the device to continue the startup sequence. This will call
1887  * dasd_eckd_do_analysis again (if the devices has not been marked
1888  * for deletion in the meantime).
1889  */
1890 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
1891                                         void *data)
1892 {
1893         struct dasd_device *device = init_cqr->startdev;
1894         struct dasd_eckd_private *private = device->private;
1895
1896         private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
1897         dasd_sfree_request(init_cqr, device);
1898         dasd_kick_device(device);
1899 }
1900
1901 static int dasd_eckd_start_analysis(struct dasd_block *block)
1902 {
1903         struct dasd_ccw_req *init_cqr;
1904
1905         init_cqr = dasd_eckd_analysis_ccw(block->base);
1906         if (IS_ERR(init_cqr))
1907                 return PTR_ERR(init_cqr);
1908         init_cqr->callback = dasd_eckd_analysis_callback;
1909         init_cqr->callback_data = NULL;
1910         init_cqr->expires = 5*HZ;
1911         /* first try without ERP, so we can later handle unformatted
1912          * devices as special case
1913          */
1914         clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
1915         init_cqr->retries = 0;
1916         dasd_add_request_head(init_cqr);
1917         return -EAGAIN;
1918 }
1919
1920 static int dasd_eckd_end_analysis(struct dasd_block *block)
1921 {
1922         struct dasd_device *device = block->base;
1923         struct dasd_eckd_private *private = device->private;
1924         struct eckd_count *count_area;
1925         unsigned int sb, blk_per_trk;
1926         int status, i;
1927         struct dasd_ccw_req *init_cqr;
1928
1929         status = private->init_cqr_status;
1930         private->init_cqr_status = -1;
1931         if (status == INIT_CQR_ERROR) {
1932                 /* try again, this time with full ERP */
1933                 init_cqr = dasd_eckd_analysis_ccw(device);
1934                 dasd_sleep_on(init_cqr);
1935                 status = dasd_eckd_analysis_evaluation(init_cqr);
1936                 dasd_sfree_request(init_cqr, device);
1937         }
1938
1939         if (device->features & DASD_FEATURE_USERAW) {
1940                 block->bp_block = DASD_RAW_BLOCKSIZE;
1941                 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
1942                 block->s2b_shift = 3;
1943                 goto raw;
1944         }
1945
1946         if (status == INIT_CQR_UNFORMATTED) {
1947                 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
1948                 return -EMEDIUMTYPE;
1949         } else if (status == INIT_CQR_ERROR) {
1950                 dev_err(&device->cdev->dev,
1951                         "Detecting the DASD disk layout failed because "
1952                         "of an I/O error\n");
1953                 return -EIO;
1954         }
1955
1956         private->uses_cdl = 1;
1957         /* Check Track 0 for Compatible Disk Layout */
1958         count_area = NULL;
1959         for (i = 0; i < 3; i++) {
1960                 if (private->count_area[i].kl != 4 ||
1961                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4 ||
1962                     private->count_area[i].cyl != 0 ||
1963                     private->count_area[i].head != count_area_head[i] ||
1964                     private->count_area[i].record != count_area_rec[i]) {
1965                         private->uses_cdl = 0;
1966                         break;
1967                 }
1968         }
1969         if (i == 3)
1970                 count_area = &private->count_area[4];
1971
1972         if (private->uses_cdl == 0) {
1973                 for (i = 0; i < 5; i++) {
1974                         if ((private->count_area[i].kl != 0) ||
1975                             (private->count_area[i].dl !=
1976                              private->count_area[0].dl) ||
1977                             private->count_area[i].cyl !=  0 ||
1978                             private->count_area[i].head != count_area_head[i] ||
1979                             private->count_area[i].record != count_area_rec[i])
1980                                 break;
1981                 }
1982                 if (i == 5)
1983                         count_area = &private->count_area[0];
1984         } else {
1985                 if (private->count_area[3].record == 1)
1986                         dev_warn(&device->cdev->dev,
1987                                  "Track 0 has no records following the VTOC\n");
1988         }
1989
1990         if (count_area != NULL && count_area->kl == 0) {
1991                 /* we found notthing violating our disk layout */
1992                 if (dasd_check_blocksize(count_area->dl) == 0)
1993                         block->bp_block = count_area->dl;
1994         }
1995         if (block->bp_block == 0) {
1996                 dev_warn(&device->cdev->dev,
1997                          "The disk layout of the DASD is not supported\n");
1998                 return -EMEDIUMTYPE;
1999         }
2000         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
2001         for (sb = 512; sb < block->bp_block; sb = sb << 1)
2002                 block->s2b_shift++;
2003
2004         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
2005
2006 raw:
2007         block->blocks = (private->real_cyl *
2008                           private->rdc_data.trk_per_cyl *
2009                           blk_per_trk);
2010
2011         dev_info(&device->cdev->dev,
2012                  "DASD with %d KB/block, %d KB total size, %d KB/track, "
2013                  "%s\n", (block->bp_block >> 10),
2014                  ((private->real_cyl *
2015                    private->rdc_data.trk_per_cyl *
2016                    blk_per_trk * (block->bp_block >> 9)) >> 1),
2017                  ((blk_per_trk * block->bp_block) >> 10),
2018                  private->uses_cdl ?
2019                  "compatible disk layout" : "linux disk layout");
2020
2021         return 0;
2022 }
2023
2024 static int dasd_eckd_do_analysis(struct dasd_block *block)
2025 {
2026         struct dasd_eckd_private *private = block->base->private;
2027
2028         if (private->init_cqr_status < 0)
2029                 return dasd_eckd_start_analysis(block);
2030         else
2031                 return dasd_eckd_end_analysis(block);
2032 }
2033
2034 static int dasd_eckd_basic_to_ready(struct dasd_device *device)
2035 {
2036         return dasd_alias_add_device(device);
2037 };
2038
2039 static int dasd_eckd_online_to_ready(struct dasd_device *device)
2040 {
2041         if (cancel_work_sync(&device->reload_device))
2042                 dasd_put_device(device);
2043         if (cancel_work_sync(&device->kick_validate))
2044                 dasd_put_device(device);
2045
2046         return 0;
2047 };
2048
2049 static int dasd_eckd_basic_to_known(struct dasd_device *device)
2050 {
2051         return dasd_alias_remove_device(device);
2052 };
2053
2054 static int
2055 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2056 {
2057         struct dasd_eckd_private *private = block->base->private;
2058
2059         if (dasd_check_blocksize(block->bp_block) == 0) {
2060                 geo->sectors = recs_per_track(&private->rdc_data,
2061                                               0, block->bp_block);
2062         }
2063         geo->cylinders = private->rdc_data.no_cyl;
2064         geo->heads = private->rdc_data.trk_per_cyl;
2065         return 0;
2066 }
2067
2068 /*
2069  * Build the TCW request for the format check
2070  */
2071 static struct dasd_ccw_req *
2072 dasd_eckd_build_check_tcw(struct dasd_device *base, struct format_data_t *fdata,
2073                           int enable_pav, struct eckd_count *fmt_buffer,
2074                           int rpt)
2075 {
2076         struct dasd_eckd_private *start_priv;
2077         struct dasd_device *startdev = NULL;
2078         struct tidaw *last_tidaw = NULL;
2079         struct dasd_ccw_req *cqr;
2080         struct itcw *itcw;
2081         int itcw_size;
2082         int count;
2083         int rc;
2084         int i;
2085
2086         if (enable_pav)
2087                 startdev = dasd_alias_get_start_dev(base);
2088
2089         if (!startdev)
2090                 startdev = base;
2091
2092         start_priv = startdev->private;
2093
2094         count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2095
2096         /*
2097          * we're adding 'count' amount of tidaw to the itcw.
2098          * calculate the corresponding itcw_size
2099          */
2100         itcw_size = itcw_calc_size(0, count, 0);
2101
2102         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev,
2103                                    NULL);
2104         if (IS_ERR(cqr))
2105                 return cqr;
2106
2107         start_priv->count++;
2108
2109         itcw = itcw_init(cqr->data, itcw_size, ITCW_OP_READ, 0, count, 0);
2110         if (IS_ERR(itcw)) {
2111                 rc = -EINVAL;
2112                 goto out_err;
2113         }
2114
2115         cqr->cpaddr = itcw_get_tcw(itcw);
2116         rc = prepare_itcw(itcw, fdata->start_unit, fdata->stop_unit,
2117                           DASD_ECKD_CCW_READ_COUNT_MT, base, startdev, 0, count,
2118                           sizeof(struct eckd_count),
2119                           count * sizeof(struct eckd_count), 0, rpt);
2120         if (rc)
2121                 goto out_err;
2122
2123         for (i = 0; i < count; i++) {
2124                 last_tidaw = itcw_add_tidaw(itcw, 0, fmt_buffer++,
2125                                             sizeof(struct eckd_count));
2126                 if (IS_ERR(last_tidaw)) {
2127                         rc = -EINVAL;
2128                         goto out_err;
2129                 }
2130         }
2131
2132         last_tidaw->flags |= TIDAW_FLAGS_LAST;
2133         itcw_finalize(itcw);
2134
2135         cqr->cpmode = 1;
2136         cqr->startdev = startdev;
2137         cqr->memdev = startdev;
2138         cqr->basedev = base;
2139         cqr->retries = startdev->default_retries;
2140         cqr->expires = startdev->default_expires * HZ;
2141         cqr->buildclk = get_tod_clock();
2142         cqr->status = DASD_CQR_FILLED;
2143         /* Set flags to suppress output for expected errors */
2144         set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
2145         set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
2146
2147         return cqr;
2148
2149 out_err:
2150         dasd_sfree_request(cqr, startdev);
2151
2152         return ERR_PTR(rc);
2153 }
2154
2155 /*
2156  * Build the CCW request for the format check
2157  */
2158 static struct dasd_ccw_req *
2159 dasd_eckd_build_check(struct dasd_device *base, struct format_data_t *fdata,
2160                       int enable_pav, struct eckd_count *fmt_buffer, int rpt)
2161 {
2162         struct dasd_eckd_private *start_priv;
2163         struct dasd_eckd_private *base_priv;
2164         struct dasd_device *startdev = NULL;
2165         struct dasd_ccw_req *cqr;
2166         struct ccw1 *ccw;
2167         void *data;
2168         int cplength, datasize;
2169         int use_prefix;
2170         int count;
2171         int i;
2172
2173         if (enable_pav)
2174                 startdev = dasd_alias_get_start_dev(base);
2175
2176         if (!startdev)
2177                 startdev = base;
2178
2179         start_priv = startdev->private;
2180         base_priv = base->private;
2181
2182         count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2183
2184         use_prefix = base_priv->features.feature[8] & 0x01;
2185
2186         if (use_prefix) {
2187                 cplength = 1;
2188                 datasize = sizeof(struct PFX_eckd_data);
2189         } else {
2190                 cplength = 2;
2191                 datasize = sizeof(struct DE_eckd_data) +
2192                         sizeof(struct LO_eckd_data);
2193         }
2194         cplength += count;
2195
2196         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2197                                    startdev, NULL);
2198         if (IS_ERR(cqr))
2199                 return cqr;
2200
2201         start_priv->count++;
2202         data = cqr->data;
2203         ccw = cqr->cpaddr;
2204
2205         if (use_prefix) {
2206                 prefix_LRE(ccw++, data, fdata->start_unit, fdata->stop_unit,
2207                            DASD_ECKD_CCW_READ_COUNT, base, startdev, 1, 0,
2208                            count, 0, 0);
2209         } else {
2210                 define_extent(ccw++, data, fdata->start_unit, fdata->stop_unit,
2211                               DASD_ECKD_CCW_READ_COUNT, startdev, 0);
2212
2213                 data += sizeof(struct DE_eckd_data);
2214                 ccw[-1].flags |= CCW_FLAG_CC;
2215
2216                 locate_record(ccw++, data, fdata->start_unit, 0, count,
2217                               DASD_ECKD_CCW_READ_COUNT, base, 0);
2218         }
2219
2220         for (i = 0; i < count; i++) {
2221                 ccw[-1].flags |= CCW_FLAG_CC;
2222                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2223                 ccw->flags = CCW_FLAG_SLI;
2224                 ccw->count = 8;
2225                 ccw->cda = (__u32)(addr_t) fmt_buffer;
2226                 ccw++;
2227                 fmt_buffer++;
2228         }
2229
2230         cqr->startdev = startdev;
2231         cqr->memdev = startdev;
2232         cqr->basedev = base;
2233         cqr->retries = DASD_RETRIES;
2234         cqr->expires = startdev->default_expires * HZ;
2235         cqr->buildclk = get_tod_clock();
2236         cqr->status = DASD_CQR_FILLED;
2237         /* Set flags to suppress output for expected errors */
2238         set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
2239
2240         return cqr;
2241 }
2242
2243 static struct dasd_ccw_req *
2244 dasd_eckd_build_format(struct dasd_device *base,
2245                        struct format_data_t *fdata,
2246                        int enable_pav)
2247 {
2248         struct dasd_eckd_private *base_priv;
2249         struct dasd_eckd_private *start_priv;
2250         struct dasd_device *startdev = NULL;
2251         struct dasd_ccw_req *fcp;
2252         struct eckd_count *ect;
2253         struct ch_t address;
2254         struct ccw1 *ccw;
2255         void *data;
2256         int rpt;
2257         int cplength, datasize;
2258         int i, j;
2259         int intensity = 0;
2260         int r0_perm;
2261         int nr_tracks;
2262         int use_prefix;
2263
2264         if (enable_pav)
2265                 startdev = dasd_alias_get_start_dev(base);
2266
2267         if (!startdev)
2268                 startdev = base;
2269
2270         start_priv = startdev->private;
2271         base_priv = base->private;
2272
2273         rpt = recs_per_track(&base_priv->rdc_data, 0, fdata->blksize);
2274
2275         nr_tracks = fdata->stop_unit - fdata->start_unit + 1;
2276
2277         /*
2278          * fdata->intensity is a bit string that tells us what to do:
2279          *   Bit 0: write record zero
2280          *   Bit 1: write home address, currently not supported
2281          *   Bit 2: invalidate tracks
2282          *   Bit 3: use OS/390 compatible disk layout (cdl)
2283          *   Bit 4: do not allow storage subsystem to modify record zero
2284          * Only some bit combinations do make sense.
2285          */
2286         if (fdata->intensity & 0x10) {
2287                 r0_perm = 0;
2288                 intensity = fdata->intensity & ~0x10;
2289         } else {
2290                 r0_perm = 1;
2291                 intensity = fdata->intensity;
2292         }
2293
2294         use_prefix = base_priv->features.feature[8] & 0x01;
2295
2296         switch (intensity) {
2297         case 0x00:      /* Normal format */
2298         case 0x08:      /* Normal format, use cdl. */
2299                 cplength = 2 + (rpt*nr_tracks);
2300                 if (use_prefix)
2301                         datasize = sizeof(struct PFX_eckd_data) +
2302                                 sizeof(struct LO_eckd_data) +
2303                                 rpt * nr_tracks * sizeof(struct eckd_count);
2304                 else
2305                         datasize = sizeof(struct DE_eckd_data) +
2306                                 sizeof(struct LO_eckd_data) +
2307                                 rpt * nr_tracks * sizeof(struct eckd_count);
2308                 break;
2309         case 0x01:      /* Write record zero and format track. */
2310         case 0x09:      /* Write record zero and format track, use cdl. */
2311                 cplength = 2 + rpt * nr_tracks;
2312                 if (use_prefix)
2313                         datasize = sizeof(struct PFX_eckd_data) +
2314                                 sizeof(struct LO_eckd_data) +
2315                                 sizeof(struct eckd_count) +
2316                                 rpt * nr_tracks * sizeof(struct eckd_count);
2317                 else
2318                         datasize = sizeof(struct DE_eckd_data) +
2319                                 sizeof(struct LO_eckd_data) +
2320                                 sizeof(struct eckd_count) +
2321                                 rpt * nr_tracks * sizeof(struct eckd_count);
2322                 break;
2323         case 0x04:      /* Invalidate track. */
2324         case 0x0c:      /* Invalidate track, use cdl. */
2325                 cplength = 3;
2326                 if (use_prefix)
2327                         datasize = sizeof(struct PFX_eckd_data) +
2328                                 sizeof(struct LO_eckd_data) +
2329                                 sizeof(struct eckd_count);
2330                 else
2331                         datasize = sizeof(struct DE_eckd_data) +
2332                                 sizeof(struct LO_eckd_data) +
2333                                 sizeof(struct eckd_count);
2334                 break;
2335         default:
2336                 dev_warn(&startdev->cdev->dev,
2337                          "An I/O control call used incorrect flags 0x%x\n",
2338                          fdata->intensity);
2339                 return ERR_PTR(-EINVAL);
2340         }
2341         /* Allocate the format ccw request. */
2342         fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
2343                                    datasize, startdev, NULL);
2344         if (IS_ERR(fcp))
2345                 return fcp;
2346
2347         start_priv->count++;
2348         data = fcp->data;
2349         ccw = fcp->cpaddr;
2350
2351         switch (intensity & ~0x08) {
2352         case 0x00: /* Normal format. */
2353                 if (use_prefix) {
2354                         prefix(ccw++, (struct PFX_eckd_data *) data,
2355                                fdata->start_unit, fdata->stop_unit,
2356                                DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2357                         /* grant subsystem permission to format R0 */
2358                         if (r0_perm)
2359                                 ((struct PFX_eckd_data *)data)
2360                                         ->define_extent.ga_extended |= 0x04;
2361                         data += sizeof(struct PFX_eckd_data);
2362                 } else {
2363                         define_extent(ccw++, (struct DE_eckd_data *) data,
2364                                       fdata->start_unit, fdata->stop_unit,
2365                                       DASD_ECKD_CCW_WRITE_CKD, startdev, 0);
2366                         /* grant subsystem permission to format R0 */
2367                         if (r0_perm)
2368                                 ((struct DE_eckd_data *) data)
2369                                         ->ga_extended |= 0x04;
2370                         data += sizeof(struct DE_eckd_data);
2371                 }
2372                 ccw[-1].flags |= CCW_FLAG_CC;
2373                 locate_record(ccw++, (struct LO_eckd_data *) data,
2374                               fdata->start_unit, 0, rpt*nr_tracks,
2375                               DASD_ECKD_CCW_WRITE_CKD, base,
2376                               fdata->blksize);
2377                 data += sizeof(struct LO_eckd_data);
2378                 break;
2379         case 0x01: /* Write record zero + format track. */
2380                 if (use_prefix) {
2381                         prefix(ccw++, (struct PFX_eckd_data *) data,
2382                                fdata->start_unit, fdata->stop_unit,
2383                                DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2384                                base, startdev);
2385                         data += sizeof(struct PFX_eckd_data);
2386                 } else {
2387                         define_extent(ccw++, (struct DE_eckd_data *) data,
2388                                fdata->start_unit, fdata->stop_unit,
2389                                DASD_ECKD_CCW_WRITE_RECORD_ZERO, startdev, 0);
2390                         data += sizeof(struct DE_eckd_data);
2391                 }
2392                 ccw[-1].flags |= CCW_FLAG_CC;
2393                 locate_record(ccw++, (struct LO_eckd_data *) data,
2394                               fdata->start_unit, 0, rpt * nr_tracks + 1,
2395                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, base,
2396                               base->block->bp_block);
2397                 data += sizeof(struct LO_eckd_data);
2398                 break;
2399         case 0x04: /* Invalidate track. */
2400                 if (use_prefix) {
2401                         prefix(ccw++, (struct PFX_eckd_data *) data,
2402                                fdata->start_unit, fdata->stop_unit,
2403                                DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2404                         data += sizeof(struct PFX_eckd_data);
2405                 } else {
2406                         define_extent(ccw++, (struct DE_eckd_data *) data,
2407                                fdata->start_unit, fdata->stop_unit,
2408                                DASD_ECKD_CCW_WRITE_CKD, startdev, 0);
2409                         data += sizeof(struct DE_eckd_data);
2410                 }
2411                 ccw[-1].flags |= CCW_FLAG_CC;
2412                 locate_record(ccw++, (struct LO_eckd_data *) data,
2413                               fdata->start_unit, 0, 1,
2414                               DASD_ECKD_CCW_WRITE_CKD, base, 8);
2415                 data += sizeof(struct LO_eckd_data);
2416                 break;
2417         }
2418
2419         for (j = 0; j < nr_tracks; j++) {
2420                 /* calculate cylinder and head for the current track */
2421                 set_ch_t(&address,
2422                          (fdata->start_unit + j) /
2423                          base_priv->rdc_data.trk_per_cyl,
2424                          (fdata->start_unit + j) %
2425                          base_priv->rdc_data.trk_per_cyl);
2426                 if (intensity & 0x01) { /* write record zero */
2427                         ect = (struct eckd_count *) data;
2428                         data += sizeof(struct eckd_count);
2429                         ect->cyl = address.cyl;
2430                         ect->head = address.head;
2431                         ect->record = 0;
2432                         ect->kl = 0;
2433                         ect->dl = 8;
2434                         ccw[-1].flags |= CCW_FLAG_CC;
2435                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2436                         ccw->flags = CCW_FLAG_SLI;
2437                         ccw->count = 8;
2438                         ccw->cda = (__u32)(addr_t) ect;
2439                         ccw++;
2440                 }
2441                 if ((intensity & ~0x08) & 0x04) {       /* erase track */
2442                         ect = (struct eckd_count *) data;
2443                         data += sizeof(struct eckd_count);
2444                         ect->cyl = address.cyl;
2445                         ect->head = address.head;
2446                         ect->record = 1;
2447                         ect->kl = 0;
2448                         ect->dl = 0;
2449                         ccw[-1].flags |= CCW_FLAG_CC;
2450                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2451                         ccw->flags = CCW_FLAG_SLI;
2452                         ccw->count = 8;
2453                         ccw->cda = (__u32)(addr_t) ect;
2454                 } else {                /* write remaining records */
2455                         for (i = 0; i < rpt; i++) {
2456                                 ect = (struct eckd_count *) data;
2457                                 data += sizeof(struct eckd_count);
2458                                 ect->cyl = address.cyl;
2459                                 ect->head = address.head;
2460                                 ect->record = i + 1;
2461                                 ect->kl = 0;
2462                                 ect->dl = fdata->blksize;
2463                                 /*
2464                                  * Check for special tracks 0-1
2465                                  * when formatting CDL
2466                                  */
2467                                 if ((intensity & 0x08) &&
2468                                     address.cyl == 0 && address.head == 0) {
2469                                         if (i < 3) {
2470                                                 ect->kl = 4;
2471                                                 ect->dl = sizes_trk0[i] - 4;
2472                                         }
2473                                 }
2474                                 if ((intensity & 0x08) &&
2475                                     address.cyl == 0 && address.head == 1) {
2476                                         ect->kl = 44;
2477                                         ect->dl = LABEL_SIZE - 44;
2478                                 }
2479                                 ccw[-1].flags |= CCW_FLAG_CC;
2480                                 if (i != 0 || j == 0)
2481                                         ccw->cmd_code =
2482                                                 DASD_ECKD_CCW_WRITE_CKD;
2483                                 else
2484                                         ccw->cmd_code =
2485                                                 DASD_ECKD_CCW_WRITE_CKD_MT;
2486                                 ccw->flags = CCW_FLAG_SLI;
2487                                 ccw->count = 8;
2488                                 ccw->cda = (__u32)(addr_t) ect;
2489                                 ccw++;
2490                         }
2491                 }
2492         }
2493
2494         fcp->startdev = startdev;
2495         fcp->memdev = startdev;
2496         fcp->basedev = base;
2497         fcp->retries = 256;
2498         fcp->expires = startdev->default_expires * HZ;
2499         fcp->buildclk = get_tod_clock();
2500         fcp->status = DASD_CQR_FILLED;
2501
2502         return fcp;
2503 }
2504
2505 /*
2506  * Wrapper function to build a CCW request depending on input data
2507  */
2508 static struct dasd_ccw_req *
2509 dasd_eckd_format_build_ccw_req(struct dasd_device *base,
2510                                struct format_data_t *fdata, int enable_pav,
2511                                int tpm, struct eckd_count *fmt_buffer, int rpt)
2512 {
2513         struct dasd_ccw_req *ccw_req;
2514
2515         if (!fmt_buffer) {
2516                 ccw_req = dasd_eckd_build_format(base, fdata, enable_pav);
2517         } else {
2518                 if (tpm)
2519                         ccw_req = dasd_eckd_build_check_tcw(base, fdata,
2520                                                             enable_pav,
2521                                                             fmt_buffer, rpt);
2522                 else
2523                         ccw_req = dasd_eckd_build_check(base, fdata, enable_pav,
2524                                                         fmt_buffer, rpt);
2525         }
2526
2527         return ccw_req;
2528 }
2529
2530 /*
2531  * Sanity checks on format_data
2532  */
2533 static int dasd_eckd_format_sanity_checks(struct dasd_device *base,
2534                                           struct format_data_t *fdata)
2535 {
2536         struct dasd_eckd_private *private = base->private;
2537
2538         if (fdata->start_unit >=
2539             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2540                 dev_warn(&base->cdev->dev,
2541                          "Start track number %u used in formatting is too big\n",
2542                          fdata->start_unit);
2543                 return -EINVAL;
2544         }
2545         if (fdata->stop_unit >=
2546             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2547                 dev_warn(&base->cdev->dev,
2548                          "Stop track number %u used in formatting is too big\n",
2549                          fdata->stop_unit);
2550                 return -EINVAL;
2551         }
2552         if (fdata->start_unit > fdata->stop_unit) {
2553                 dev_warn(&base->cdev->dev,
2554                          "Start track %u used in formatting exceeds end track\n",
2555                          fdata->start_unit);
2556                 return -EINVAL;
2557         }
2558         if (dasd_check_blocksize(fdata->blksize) != 0) {
2559                 dev_warn(&base->cdev->dev,
2560                          "The DASD cannot be formatted with block size %u\n",
2561                          fdata->blksize);
2562                 return -EINVAL;
2563         }
2564         return 0;
2565 }
2566
2567 /*
2568  * This function will process format_data originally coming from an IOCTL
2569  */
2570 static int dasd_eckd_format_process_data(struct dasd_device *base,
2571                                          struct format_data_t *fdata,
2572                                          int enable_pav, int tpm,
2573                                          struct eckd_count *fmt_buffer, int rpt,
2574                                          struct irb *irb)
2575 {
2576         struct dasd_eckd_private *private = base->private;
2577         struct dasd_ccw_req *cqr, *n;
2578         struct list_head format_queue;
2579         struct dasd_device *device;
2580         char *sense = NULL;
2581         int old_start, old_stop, format_step;
2582         int step, retry;
2583         int rc;
2584
2585         rc = dasd_eckd_format_sanity_checks(base, fdata);
2586         if (rc)
2587                 return rc;
2588
2589         INIT_LIST_HEAD(&format_queue);
2590
2591         old_start = fdata->start_unit;
2592         old_stop = fdata->stop_unit;
2593
2594         if (!tpm && fmt_buffer != NULL) {
2595                 /* Command Mode / Format Check */
2596                 format_step = 1;
2597         } else if (tpm && fmt_buffer != NULL) {
2598                 /* Transport Mode / Format Check */
2599                 format_step = DASD_CQR_MAX_CCW / rpt;
2600         } else {
2601                 /* Normal Formatting */
2602                 format_step = DASD_CQR_MAX_CCW /
2603                         recs_per_track(&private->rdc_data, 0, fdata->blksize);
2604         }
2605
2606         do {
2607                 retry = 0;
2608                 while (fdata->start_unit <= old_stop) {
2609                         step = fdata->stop_unit - fdata->start_unit + 1;
2610                         if (step > format_step) {
2611                                 fdata->stop_unit =
2612                                         fdata->start_unit + format_step - 1;
2613                         }
2614
2615                         cqr = dasd_eckd_format_build_ccw_req(base, fdata,
2616                                                              enable_pav, tpm,
2617                                                              fmt_buffer, rpt);
2618                         if (IS_ERR(cqr)) {
2619                                 rc = PTR_ERR(cqr);
2620                                 if (rc == -ENOMEM) {
2621                                         if (list_empty(&format_queue))
2622                                                 goto out;
2623                                         /*
2624                                          * not enough memory available, start
2625                                          * requests retry after first requests
2626                                          * were finished
2627                                          */
2628                                         retry = 1;
2629                                         break;
2630                                 }
2631                                 goto out_err;
2632                         }
2633                         list_add_tail(&cqr->blocklist, &format_queue);
2634
2635                         if (fmt_buffer) {
2636                                 step = fdata->stop_unit - fdata->start_unit + 1;
2637                                 fmt_buffer += rpt * step;
2638                         }
2639                         fdata->start_unit = fdata->stop_unit + 1;
2640                         fdata->stop_unit = old_stop;
2641                 }
2642
2643                 rc = dasd_sleep_on_queue(&format_queue);
2644
2645 out_err:
2646                 list_for_each_entry_safe(cqr, n, &format_queue, blocklist) {
2647                         device = cqr->startdev;
2648                         private = device->private;
2649
2650                         if (cqr->status == DASD_CQR_FAILED) {
2651                                 /*
2652                                  * Only get sense data if called by format
2653                                  * check
2654                                  */
2655                                 if (fmt_buffer && irb) {
2656                                         sense = dasd_get_sense(&cqr->irb);
2657                                         memcpy(irb, &cqr->irb, sizeof(*irb));
2658                                 }
2659                                 rc = -EIO;
2660                         }
2661                         list_del_init(&cqr->blocklist);
2662                         dasd_sfree_request(cqr, device);
2663                         private->count--;
2664                 }
2665
2666                 if (rc && rc != -EIO)
2667                         goto out;
2668                 if (rc == -EIO) {
2669                         /*
2670                          * In case fewer than the expected records are on the
2671                          * track, we will most likely get a 'No Record Found'
2672                          * error (in command mode) or a 'File Protected' error
2673                          * (in transport mode). Those particular cases shouldn't
2674                          * pass the -EIO to the IOCTL, therefore reset the rc
2675                          * and continue.
2676                          */
2677                         if (sense &&
2678                             (sense[1] & SNS1_NO_REC_FOUND ||
2679                              sense[1] & SNS1_FILE_PROTECTED))
2680                                 retry = 1;
2681                         else
2682                                 goto out;
2683                 }
2684
2685         } while (retry);
2686
2687 out:
2688         fdata->start_unit = old_start;
2689         fdata->stop_unit = old_stop;
2690
2691         return rc;
2692 }
2693
2694 static int dasd_eckd_format_device(struct dasd_device *base,
2695                                    struct format_data_t *fdata, int enable_pav)
2696 {
2697         return dasd_eckd_format_process_data(base, fdata, enable_pav, 0, NULL,
2698                                              0, NULL);
2699 }
2700
2701 /*
2702  * Helper function to count consecutive records of a single track.
2703  */
2704 static int dasd_eckd_count_records(struct eckd_count *fmt_buffer, int start,
2705                                    int max)
2706 {
2707         int head;
2708         int i;
2709
2710         head = fmt_buffer[start].head;
2711
2712         /*
2713          * There are 3 conditions where we stop counting:
2714          * - if data reoccurs (same head and record may reoccur), which may
2715          *   happen due to the way DASD_ECKD_CCW_READ_COUNT works
2716          * - when the head changes, because we're iterating over several tracks
2717          *   then (DASD_ECKD_CCW_READ_COUNT_MT)
2718          * - when we've reached the end of sensible data in the buffer (the
2719          *   record will be 0 then)
2720          */
2721         for (i = start; i < max; i++) {
2722                 if (i > start) {
2723                         if ((fmt_buffer[i].head == head &&
2724                             fmt_buffer[i].record == 1) ||
2725                             fmt_buffer[i].head != head ||
2726                             fmt_buffer[i].record == 0)
2727                                 break;
2728                 }
2729         }
2730
2731         return i - start;
2732 }
2733
2734 /*
2735  * Evaluate a given range of tracks. Data like number of records, blocksize,
2736  * record ids, and key length are compared with expected data.
2737  *
2738  * If a mismatch occurs, the corresponding error bit is set, as well as
2739  * additional information, depending on the error.
2740  */
2741 static void dasd_eckd_format_evaluate_tracks(struct eckd_count *fmt_buffer,
2742                                              struct format_check_t *cdata,
2743                                              int rpt_max, int rpt_exp,
2744                                              int trk_per_cyl, int tpm)
2745 {
2746         struct ch_t geo;
2747         int max_entries;
2748         int count = 0;
2749         int trkcount;
2750         int blksize;
2751         int pos = 0;
2752         int i, j;
2753         int kl;
2754
2755         trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
2756         max_entries = trkcount * rpt_max;
2757
2758         for (i = cdata->expect.start_unit; i <= cdata->expect.stop_unit; i++) {
2759                 /* Calculate the correct next starting position in the buffer */
2760                 if (tpm) {
2761                         while (fmt_buffer[pos].record == 0 &&
2762                                fmt_buffer[pos].dl == 0) {
2763                                 if (pos++ > max_entries)
2764                                         break;
2765                         }
2766                 } else {
2767                         if (i != cdata->expect.start_unit)
2768                                 pos += rpt_max - count;
2769                 }
2770
2771                 /* Calculate the expected geo values for the current track */
2772                 set_ch_t(&geo, i / trk_per_cyl, i % trk_per_cyl);
2773
2774                 /* Count and check number of records */
2775                 count = dasd_eckd_count_records(fmt_buffer, pos, pos + rpt_max);
2776
2777                 if (count < rpt_exp) {
2778                         cdata->result = DASD_FMT_ERR_TOO_FEW_RECORDS;
2779                         break;
2780                 }
2781                 if (count > rpt_exp) {
2782                         cdata->result = DASD_FMT_ERR_TOO_MANY_RECORDS;
2783                         break;
2784                 }
2785
2786                 for (j = 0; j < count; j++, pos++) {
2787                         blksize = cdata->expect.blksize;
2788                         kl = 0;
2789
2790                         /*
2791                          * Set special values when checking CDL formatted
2792                          * devices.
2793                          */
2794                         if ((cdata->expect.intensity & 0x08) &&
2795                             geo.cyl == 0 && geo.head == 0) {
2796                                 if (j < 3) {
2797                                         blksize = sizes_trk0[j] - 4;
2798                                         kl = 4;
2799                                 }
2800                         }
2801                         if ((cdata->expect.intensity & 0x08) &&
2802                             geo.cyl == 0 && geo.head == 1) {
2803                                 blksize = LABEL_SIZE - 44;
2804                                 kl = 44;
2805                         }
2806
2807                         /* Check blocksize */
2808                         if (fmt_buffer[pos].dl != blksize) {
2809                                 cdata->result = DASD_FMT_ERR_BLKSIZE;
2810                                 goto out;
2811                         }
2812                         /* Check if key length is 0 */
2813                         if (fmt_buffer[pos].kl != kl) {
2814                                 cdata->result = DASD_FMT_ERR_KEY_LENGTH;
2815                                 goto out;
2816                         }
2817                         /* Check if record_id is correct */
2818                         if (fmt_buffer[pos].cyl != geo.cyl ||
2819                             fmt_buffer[pos].head != geo.head ||
2820                             fmt_buffer[pos].record != (j + 1)) {
2821                                 cdata->result = DASD_FMT_ERR_RECORD_ID;
2822                                 goto out;
2823                         }
2824                 }
2825         }
2826
2827 out:
2828         /*
2829          * In case of no errors, we need to decrease by one
2830          * to get the correct positions.
2831          */
2832         if (!cdata->result) {
2833                 i--;
2834                 pos--;
2835         }
2836
2837         cdata->unit = i;
2838         cdata->num_records = count;
2839         cdata->rec = fmt_buffer[pos].record;
2840         cdata->blksize = fmt_buffer[pos].dl;
2841         cdata->key_length = fmt_buffer[pos].kl;
2842 }
2843
2844 /*
2845  * Check the format of a range of tracks of a DASD.
2846  */
2847 static int dasd_eckd_check_device_format(struct dasd_device *base,
2848                                          struct format_check_t *cdata,
2849                                          int enable_pav)
2850 {
2851         struct dasd_eckd_private *private = base->private;
2852         struct eckd_count *fmt_buffer;
2853         struct irb irb;
2854         int rpt_max, rpt_exp;
2855         int fmt_buffer_size;
2856         int trk_per_cyl;
2857         int trkcount;
2858         int tpm = 0;
2859         int rc;
2860
2861         trk_per_cyl = private->rdc_data.trk_per_cyl;
2862
2863         /* Get maximum and expected amount of records per track */
2864         rpt_max = recs_per_track(&private->rdc_data, 0, 512) + 1;
2865         rpt_exp = recs_per_track(&private->rdc_data, 0, cdata->expect.blksize);
2866
2867         trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
2868         fmt_buffer_size = trkcount * rpt_max * sizeof(struct eckd_count);
2869
2870         fmt_buffer = kzalloc(fmt_buffer_size, GFP_KERNEL | GFP_DMA);
2871         if (!fmt_buffer)
2872                 return -ENOMEM;
2873
2874         /*
2875          * A certain FICON feature subset is needed to operate in transport
2876          * mode. Additionally, the support for transport mode is implicitly
2877          * checked by comparing the buffer size with fcx_max_data. As long as
2878          * the buffer size is smaller we can operate in transport mode and
2879          * process multiple tracks. If not, only one track at once is being
2880          * processed using command mode.
2881          */
2882         if ((private->features.feature[40] & 0x04) &&
2883             fmt_buffer_size <= private->fcx_max_data)
2884                 tpm = 1;
2885
2886         rc = dasd_eckd_format_process_data(base, &cdata->expect, enable_pav,
2887                                            tpm, fmt_buffer, rpt_max, &irb);
2888         if (rc && rc != -EIO)
2889                 goto out;
2890         if (rc == -EIO) {
2891                 /*
2892                  * If our first attempt with transport mode enabled comes back
2893                  * with an incorrect length error, we're going to retry the
2894                  * check with command mode.
2895                  */
2896                 if (tpm && scsw_cstat(&irb.scsw) == 0x40) {
2897                         tpm = 0;
2898                         rc = dasd_eckd_format_process_data(base, &cdata->expect,
2899                                                            enable_pav, tpm,
2900                                                            fmt_buffer, rpt_max,
2901                                                            &irb);
2902                         if (rc)
2903                                 goto out;
2904                 } else {
2905                         goto out;
2906                 }
2907         }
2908
2909         dasd_eckd_format_evaluate_tracks(fmt_buffer, cdata, rpt_max, rpt_exp,
2910                                          trk_per_cyl, tpm);
2911
2912 out:
2913         kfree(fmt_buffer);
2914
2915         return rc;
2916 }
2917
2918 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
2919 {
2920         if (cqr->retries < 0) {
2921                 cqr->status = DASD_CQR_FAILED;
2922                 return;
2923         }
2924         cqr->status = DASD_CQR_FILLED;
2925         if (cqr->block && (cqr->startdev != cqr->block->base)) {
2926                 dasd_eckd_reset_ccw_to_base_io(cqr);
2927                 cqr->startdev = cqr->block->base;
2928                 cqr->lpm = dasd_path_get_opm(cqr->block->base);
2929         }
2930 };
2931
2932 static dasd_erp_fn_t
2933 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
2934 {
2935         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
2936         struct ccw_device *cdev = device->cdev;
2937
2938         switch (cdev->id.cu_type) {
2939         case 0x3990:
2940         case 0x2105:
2941         case 0x2107:
2942         case 0x1750:
2943                 return dasd_3990_erp_action;
2944         case 0x9343:
2945         case 0x3880:
2946         default:
2947                 return dasd_default_erp_action;
2948         }
2949 }
2950
2951 static dasd_erp_fn_t
2952 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
2953 {
2954         return dasd_default_erp_postaction;
2955 }
2956
2957 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
2958                                               struct dasd_ccw_req *cqr,
2959                                               struct irb *irb)
2960 {
2961         char mask;
2962         char *sense = NULL;
2963         struct dasd_eckd_private *private = device->private;
2964
2965         /* first of all check for state change pending interrupt */
2966         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
2967         if ((scsw_dstat(&irb->scsw) & mask) == mask) {
2968                 /*
2969                  * for alias only, not in offline processing
2970                  * and only if not suspended
2971                  */
2972                 if (!device->block && private->lcu &&
2973                     device->state == DASD_STATE_ONLINE &&
2974                     !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
2975                     !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
2976                         /* schedule worker to reload device */
2977                         dasd_reload_device(device);
2978                 }
2979                 dasd_generic_handle_state_change(device);
2980                 return;
2981         }
2982
2983         sense = dasd_get_sense(irb);
2984         if (!sense)
2985                 return;
2986
2987         /* summary unit check */
2988         if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
2989             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
2990                 if (test_and_set_bit(DASD_FLAG_SUC, &device->flags)) {
2991                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2992                                       "eckd suc: device already notified");
2993                         return;
2994                 }
2995                 sense = dasd_get_sense(irb);
2996                 if (!sense) {
2997                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2998                                       "eckd suc: no reason code available");
2999                         clear_bit(DASD_FLAG_SUC, &device->flags);
3000                         return;
3001
3002                 }
3003                 private->suc_reason = sense[8];
3004                 DBF_DEV_EVENT(DBF_NOTICE, device, "%s %x",
3005                               "eckd handle summary unit check: reason",
3006                               private->suc_reason);
3007                 dasd_get_device(device);
3008                 if (!schedule_work(&device->suc_work))
3009                         dasd_put_device(device);
3010
3011                 return;
3012         }
3013
3014         /* service information message SIM */
3015         if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
3016             ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
3017                 dasd_3990_erp_handle_sim(device, sense);
3018                 return;
3019         }
3020
3021         /* loss of device reservation is handled via base devices only
3022          * as alias devices may be used with several bases
3023          */
3024         if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
3025             (sense[7] == 0x3F) &&
3026             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
3027             test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
3028                 if (device->features & DASD_FEATURE_FAILONSLCK)
3029                         set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
3030                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3031                 dev_err(&device->cdev->dev,
3032                         "The device reservation was lost\n");
3033         }
3034 }
3035
3036 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
3037                                                struct dasd_device *startdev,
3038                                                struct dasd_block *block,
3039                                                struct request *req,
3040                                                sector_t first_rec,
3041                                                sector_t last_rec,
3042                                                sector_t first_trk,
3043                                                sector_t last_trk,
3044                                                unsigned int first_offs,
3045                                                unsigned int last_offs,
3046                                                unsigned int blk_per_trk,
3047                                                unsigned int blksize)
3048 {
3049         struct dasd_eckd_private *private;
3050         unsigned long *idaws;
3051         struct LO_eckd_data *LO_data;
3052         struct dasd_ccw_req *cqr;
3053         struct ccw1 *ccw;
3054         struct req_iterator iter;
3055         struct bio_vec bv;
3056         char *dst;
3057         unsigned int off;
3058         int count, cidaw, cplength, datasize;
3059         sector_t recid;
3060         unsigned char cmd, rcmd;
3061         int use_prefix;
3062         struct dasd_device *basedev;
3063
3064         basedev = block->base;
3065         private = basedev->private;
3066         if (rq_data_dir(req) == READ)
3067                 cmd = DASD_ECKD_CCW_READ_MT;
3068         else if (rq_data_dir(req) == WRITE)
3069                 cmd = DASD_ECKD_CCW_WRITE_MT;
3070         else
3071                 return ERR_PTR(-EINVAL);
3072
3073         /* Check struct bio and count the number of blocks for the request. */
3074         count = 0;
3075         cidaw = 0;
3076         rq_for_each_segment(bv, req, iter) {
3077                 if (bv.bv_len & (blksize - 1))
3078                         /* Eckd can only do full blocks. */
3079                         return ERR_PTR(-EINVAL);
3080                 count += bv.bv_len >> (block->s2b_shift + 9);
3081                 if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
3082                         cidaw += bv.bv_len >> (block->s2b_shift + 9);
3083         }
3084         /* Paranoia. */
3085         if (count != last_rec - first_rec + 1)
3086                 return ERR_PTR(-EINVAL);
3087
3088         /* use the prefix command if available */
3089         use_prefix = private->features.feature[8] & 0x01;
3090         if (use_prefix) {
3091                 /* 1x prefix + number of blocks */
3092                 cplength = 2 + count;
3093                 /* 1x prefix + cidaws*sizeof(long) */
3094                 datasize = sizeof(struct PFX_eckd_data) +
3095                         sizeof(struct LO_eckd_data) +
3096                         cidaw * sizeof(unsigned long);
3097         } else {
3098                 /* 1x define extent + 1x locate record + number of blocks */
3099                 cplength = 2 + count;
3100                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
3101                 datasize = sizeof(struct DE_eckd_data) +
3102                         sizeof(struct LO_eckd_data) +
3103                         cidaw * sizeof(unsigned long);
3104         }
3105         /* Find out the number of additional locate record ccws for cdl. */
3106         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
3107                 if (last_rec >= 2*blk_per_trk)
3108                         count = 2*blk_per_trk - first_rec;
3109                 cplength += count;
3110                 datasize += count*sizeof(struct LO_eckd_data);
3111         }
3112         /* Allocate the ccw request. */
3113         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
3114                                    startdev, blk_mq_rq_to_pdu(req));
3115         if (IS_ERR(cqr))
3116                 return cqr;
3117         ccw = cqr->cpaddr;
3118         /* First ccw is define extent or prefix. */
3119         if (use_prefix) {
3120                 if (prefix(ccw++, cqr->data, first_trk,
3121                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
3122                         /* Clock not in sync and XRC is enabled.
3123                          * Try again later.
3124                          */
3125                         dasd_sfree_request(cqr, startdev);
3126                         return ERR_PTR(-EAGAIN);
3127                 }
3128                 idaws = (unsigned long *) (cqr->data +
3129                                            sizeof(struct PFX_eckd_data));
3130         } else {
3131                 if (define_extent(ccw++, cqr->data, first_trk,
3132                                   last_trk, cmd, basedev, 0) == -EAGAIN) {
3133                         /* Clock not in sync and XRC is enabled.
3134                          * Try again later.
3135                          */
3136                         dasd_sfree_request(cqr, startdev);
3137                         return ERR_PTR(-EAGAIN);
3138                 }
3139                 idaws = (unsigned long *) (cqr->data +
3140                                            sizeof(struct DE_eckd_data));
3141         }
3142         /* Build locate_record+read/write/ccws. */
3143         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
3144         recid = first_rec;
3145         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
3146                 /* Only standard blocks so there is just one locate record. */
3147                 ccw[-1].flags |= CCW_FLAG_CC;
3148                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
3149                               last_rec - recid + 1, cmd, basedev, blksize);
3150         }
3151         rq_for_each_segment(bv, req, iter) {
3152                 dst = page_address(bv.bv_page) + bv.bv_offset;
3153                 if (dasd_page_cache) {
3154                         char *copy = kmem_cache_alloc(dasd_page_cache,
3155                                                       GFP_DMA | __GFP_NOWARN);
3156                         if (copy && rq_data_dir(req) == WRITE)
3157                                 memcpy(copy + bv.bv_offset, dst, bv.bv_len);
3158                         if (copy)
3159                                 dst = copy + bv.bv_offset;
3160                 }
3161                 for (off = 0; off < bv.bv_len; off += blksize) {
3162                         sector_t trkid = recid;
3163                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
3164                         rcmd = cmd;
3165                         count = blksize;
3166                         /* Locate record for cdl special block ? */
3167                         if (private->uses_cdl && recid < 2*blk_per_trk) {
3168                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
3169                                         rcmd |= 0x8;
3170                                         count = dasd_eckd_cdl_reclen(recid);
3171                                         if (count < blksize &&
3172                                             rq_data_dir(req) == READ)
3173                                                 memset(dst + count, 0xe5,
3174                                                        blksize - count);
3175                                 }
3176                                 ccw[-1].flags |= CCW_FLAG_CC;
3177                                 locate_record(ccw++, LO_data++,
3178                                               trkid, recoffs + 1,
3179                                               1, rcmd, basedev, count);
3180                         }
3181                         /* Locate record for standard blocks ? */
3182                         if (private->uses_cdl && recid == 2*blk_per_trk) {
3183                                 ccw[-1].flags |= CCW_FLAG_CC;
3184                                 locate_record(ccw++, LO_data++,
3185                                               trkid, recoffs + 1,
3186                                               last_rec - recid + 1,
3187                                               cmd, basedev, count);
3188                         }
3189                         /* Read/write ccw. */
3190                         ccw[-1].flags |= CCW_FLAG_CC;
3191                         ccw->cmd_code = rcmd;
3192                         ccw->count = count;
3193                         if (idal_is_needed(dst, blksize)) {
3194                                 ccw->cda = (__u32)(addr_t) idaws;
3195                                 ccw->flags = CCW_FLAG_IDA;
3196                                 idaws = idal_create_words(idaws, dst, blksize);
3197                         } else {
3198                                 ccw->cda = (__u32)(addr_t) dst;
3199                                 ccw->flags = 0;
3200                         }
3201                         ccw++;
3202                         dst += blksize;
3203                         recid++;
3204                 }
3205         }
3206         if (blk_noretry_request(req) ||
3207             block->base->features & DASD_FEATURE_FAILFAST)
3208                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3209         cqr->startdev = startdev;
3210         cqr->memdev = startdev;
3211         cqr->block = block;
3212         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
3213         cqr->lpm = dasd_path_get_ppm(startdev);
3214         cqr->retries = startdev->default_retries;
3215         cqr->buildclk = get_tod_clock();
3216         cqr->status = DASD_CQR_FILLED;
3217         return cqr;
3218 }
3219
3220 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
3221                                                struct dasd_device *startdev,
3222                                                struct dasd_block *block,
3223                                                struct request *req,
3224                                                sector_t first_rec,
3225                                                sector_t last_rec,
3226                                                sector_t first_trk,
3227                                                sector_t last_trk,
3228                                                unsigned int first_offs,
3229                                                unsigned int last_offs,
3230                                                unsigned int blk_per_trk,
3231                                                unsigned int blksize)
3232 {
3233         unsigned long *idaws;
3234         struct dasd_ccw_req *cqr;
3235         struct ccw1 *ccw;
3236         struct req_iterator iter;
3237         struct bio_vec bv;
3238         char *dst, *idaw_dst;
3239         unsigned int cidaw, cplength, datasize;
3240         unsigned int tlf;
3241         sector_t recid;
3242         unsigned char cmd;
3243         struct dasd_device *basedev;
3244         unsigned int trkcount, count, count_to_trk_end;
3245         unsigned int idaw_len, seg_len, part_len, len_to_track_end;
3246         unsigned char new_track, end_idaw;
3247         sector_t trkid;
3248         unsigned int recoffs;
3249
3250         basedev = block->base;
3251         if (rq_data_dir(req) == READ)
3252                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
3253         else if (rq_data_dir(req) == WRITE)
3254                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
3255         else
3256                 return ERR_PTR(-EINVAL);
3257
3258         /* Track based I/O needs IDAWs for each page, and not just for
3259          * 64 bit addresses. We need additional idals for pages
3260          * that get filled from two tracks, so we use the number
3261          * of records as upper limit.
3262          */
3263         cidaw = last_rec - first_rec + 1;
3264         trkcount = last_trk - first_trk + 1;
3265
3266         /* 1x prefix + one read/write ccw per track */
3267         cplength = 1 + trkcount;
3268
3269         datasize = sizeof(struct PFX_eckd_data) + cidaw * sizeof(unsigned long);
3270
3271         /* Allocate the ccw request. */
3272         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
3273                                    startdev, blk_mq_rq_to_pdu(req));
3274         if (IS_ERR(cqr))
3275                 return cqr;
3276         ccw = cqr->cpaddr;
3277         /* transfer length factor: how many bytes to read from the last track */
3278         if (first_trk == last_trk)
3279                 tlf = last_offs - first_offs + 1;
3280         else
3281                 tlf = last_offs + 1;
3282         tlf *= blksize;
3283
3284         if (prefix_LRE(ccw++, cqr->data, first_trk,
3285                        last_trk, cmd, basedev, startdev,
3286                        1 /* format */, first_offs + 1,
3287                        trkcount, blksize,
3288                        tlf) == -EAGAIN) {
3289                 /* Clock not in sync and XRC is enabled.
3290                  * Try again later.
3291                  */
3292                 dasd_sfree_request(cqr, startdev);
3293                 return ERR_PTR(-EAGAIN);
3294         }
3295
3296         /*
3297          * The translation of request into ccw programs must meet the
3298          * following conditions:
3299          * - all idaws but the first and the last must address full pages
3300          *   (or 2K blocks on 31-bit)
3301          * - the scope of a ccw and it's idal ends with the track boundaries
3302          */
3303         idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
3304         recid = first_rec;
3305         new_track = 1;
3306         end_idaw = 0;
3307         len_to_track_end = 0;
3308         idaw_dst = NULL;
3309         idaw_len = 0;
3310         rq_for_each_segment(bv, req, iter) {
3311                 dst = page_address(bv.bv_page) + bv.bv_offset;
3312                 seg_len = bv.bv_len;
3313                 while (seg_len) {
3314                         if (new_track) {
3315                                 trkid = recid;
3316                                 recoffs = sector_div(trkid, blk_per_trk);
3317                                 count_to_trk_end = blk_per_trk - recoffs;
3318                                 count = min((last_rec - recid + 1),
3319                                             (sector_t)count_to_trk_end);
3320                                 len_to_track_end = count * blksize;
3321                                 ccw[-1].flags |= CCW_FLAG_CC;
3322                                 ccw->cmd_code = cmd;
3323                                 ccw->count = len_to_track_end;
3324                                 ccw->cda = (__u32)(addr_t)idaws;
3325                                 ccw->flags = CCW_FLAG_IDA;
3326                                 ccw++;
3327                                 recid += count;
3328                                 new_track = 0;
3329                                 /* first idaw for a ccw may start anywhere */
3330                                 if (!idaw_dst)
3331                                         idaw_dst = dst;
3332                         }
3333                         /* If we start a new idaw, we must make sure that it
3334                          * starts on an IDA_BLOCK_SIZE boundary.
3335                          * If we continue an idaw, we must make sure that the
3336                          * current segment begins where the so far accumulated
3337                          * idaw ends
3338                          */
3339                         if (!idaw_dst) {
3340                                 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
3341                                         dasd_sfree_request(cqr, startdev);
3342                                         return ERR_PTR(-ERANGE);
3343                                 } else
3344                                         idaw_dst = dst;
3345                         }
3346                         if ((idaw_dst + idaw_len) != dst) {
3347                                 dasd_sfree_request(cqr, startdev);
3348                                 return ERR_PTR(-ERANGE);
3349                         }
3350                         part_len = min(seg_len, len_to_track_end);
3351                         seg_len -= part_len;
3352                         dst += part_len;
3353                         idaw_len += part_len;
3354                         len_to_track_end -= part_len;
3355                         /* collected memory area ends on an IDA_BLOCK border,
3356                          * -> create an idaw
3357                          * idal_create_words will handle cases where idaw_len
3358                          * is larger then IDA_BLOCK_SIZE
3359                          */
3360                         if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
3361                                 end_idaw = 1;
3362                         /* We also need to end the idaw at track end */
3363                         if (!len_to_track_end) {
3364                                 new_track = 1;
3365                                 end_idaw = 1;
3366                         }
3367                         if (end_idaw) {
3368                                 idaws = idal_create_words(idaws, idaw_dst,
3369                                                           idaw_len);
3370                                 idaw_dst = NULL;
3371                                 idaw_len = 0;
3372                                 end_idaw = 0;
3373                         }
3374                 }
3375         }
3376
3377         if (blk_noretry_request(req) ||
3378             block->base->features & DASD_FEATURE_FAILFAST)
3379                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3380         cqr->startdev = startdev;
3381         cqr->memdev = startdev;
3382         cqr->block = block;
3383         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
3384         cqr->lpm = dasd_path_get_ppm(startdev);
3385         cqr->retries = startdev->default_retries;
3386         cqr->buildclk = get_tod_clock();
3387         cqr->status = DASD_CQR_FILLED;
3388         return cqr;
3389 }
3390
3391 static int prepare_itcw(struct itcw *itcw,
3392                         unsigned int trk, unsigned int totrk, int cmd,
3393                         struct dasd_device *basedev,
3394                         struct dasd_device *startdev,
3395                         unsigned int rec_on_trk, int count,
3396                         unsigned int blksize,
3397                         unsigned int total_data_size,
3398                         unsigned int tlf,
3399                         unsigned int blk_per_trk)
3400 {
3401         struct PFX_eckd_data pfxdata;
3402         struct dasd_eckd_private *basepriv, *startpriv;
3403         struct DE_eckd_data *dedata;
3404         struct LRE_eckd_data *lredata;
3405         struct dcw *dcw;
3406
3407         u32 begcyl, endcyl;
3408         u16 heads, beghead, endhead;
3409         u8 pfx_cmd;
3410
3411         int rc = 0;
3412         int sector = 0;
3413         int dn, d;
3414
3415
3416         /* setup prefix data */
3417         basepriv = basedev->private;
3418         startpriv = startdev->private;
3419         dedata = &pfxdata.define_extent;
3420         lredata = &pfxdata.locate_record;
3421
3422         memset(&pfxdata, 0, sizeof(pfxdata));
3423         pfxdata.format = 1; /* PFX with LRE */
3424         pfxdata.base_address = basepriv->ned->unit_addr;
3425         pfxdata.base_lss = basepriv->ned->ID;
3426         pfxdata.validity.define_extent = 1;
3427
3428         /* private uid is kept up to date, conf_data may be outdated */
3429         if (startpriv->uid.type == UA_BASE_PAV_ALIAS)
3430                 pfxdata.validity.verify_base = 1;
3431
3432         if (startpriv->uid.type == UA_HYPER_PAV_ALIAS) {
3433                 pfxdata.validity.verify_base = 1;
3434                 pfxdata.validity.hyper_pav = 1;
3435         }
3436
3437         switch (cmd) {
3438         case DASD_ECKD_CCW_READ_TRACK_DATA:
3439                 dedata->mask.perm = 0x1;
3440                 dedata->attributes.operation = basepriv->attrib.operation;
3441                 dedata->blk_size = blksize;
3442                 dedata->ga_extended |= 0x42;
3443                 lredata->operation.orientation = 0x0;
3444                 lredata->operation.operation = 0x0C;
3445                 lredata->auxiliary.check_bytes = 0x01;
3446                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
3447                 break;
3448         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
3449                 dedata->mask.perm = 0x02;
3450                 dedata->attributes.operation = basepriv->attrib.operation;
3451                 dedata->blk_size = blksize;
3452                 rc = set_timestamp(NULL, dedata, basedev);
3453                 dedata->ga_extended |= 0x42;
3454                 lredata->operation.orientation = 0x0;
3455                 lredata->operation.operation = 0x3F;
3456                 lredata->extended_operation = 0x23;
3457                 lredata->auxiliary.check_bytes = 0x2;
3458                 /*
3459                  * If XRC is supported the System Time Stamp is set. The
3460                  * validity of the time stamp must be reflected in the prefix
3461                  * data as well.
3462                  */
3463                 if (dedata->ga_extended & 0x08 && dedata->ga_extended & 0x02)
3464                         pfxdata.validity.time_stamp = 1; /* 'Time Stamp Valid' */
3465                 pfx_cmd = DASD_ECKD_CCW_PFX;
3466                 break;
3467         case DASD_ECKD_CCW_READ_COUNT_MT:
3468                 dedata->mask.perm = 0x1;
3469                 dedata->attributes.operation = DASD_BYPASS_CACHE;
3470                 dedata->ga_extended |= 0x42;
3471                 dedata->blk_size = blksize;
3472                 lredata->operation.orientation = 0x2;
3473                 lredata->operation.operation = 0x16;
3474                 lredata->auxiliary.check_bytes = 0x01;
3475                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
3476                 break;
3477         default:
3478                 DBF_DEV_EVENT(DBF_ERR, basedev,
3479                               "prepare itcw, unknown opcode 0x%x", cmd);
3480                 BUG();
3481                 break;
3482         }
3483         if (rc)
3484                 return rc;
3485
3486         dedata->attributes.mode = 0x3;  /* ECKD */
3487
3488         heads = basepriv->rdc_data.trk_per_cyl;
3489         begcyl = trk / heads;
3490         beghead = trk % heads;
3491         endcyl = totrk / heads;
3492         endhead = totrk % heads;
3493
3494         /* check for sequential prestage - enhance cylinder range */
3495         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
3496             dedata->attributes.operation == DASD_SEQ_ACCESS) {
3497
3498                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
3499                         endcyl += basepriv->attrib.nr_cyl;
3500                 else
3501                         endcyl = (basepriv->real_cyl - 1);
3502         }
3503
3504         set_ch_t(&dedata->beg_ext, begcyl, beghead);
3505         set_ch_t(&dedata->end_ext, endcyl, endhead);
3506
3507         dedata->ep_format = 0x20; /* records per track is valid */
3508         dedata->ep_rec_per_track = blk_per_trk;
3509
3510         if (rec_on_trk) {
3511                 switch (basepriv->rdc_data.dev_type) {
3512                 case 0x3390:
3513                         dn = ceil_quot(blksize + 6, 232);
3514                         d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
3515                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
3516                         break;
3517                 case 0x3380:
3518                         d = 7 + ceil_quot(blksize + 12, 32);
3519                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
3520                         break;
3521                 }
3522         }
3523
3524         if (cmd == DASD_ECKD_CCW_READ_COUNT_MT) {
3525                 lredata->auxiliary.length_valid = 0;
3526                 lredata->auxiliary.length_scope = 0;
3527                 lredata->sector = 0xff;
3528         } else {
3529                 lredata->auxiliary.length_valid = 1;
3530                 lredata->auxiliary.length_scope = 1;
3531                 lredata->sector = sector;
3532         }
3533         lredata->auxiliary.imbedded_ccw_valid = 1;
3534         lredata->length = tlf;
3535         lredata->imbedded_ccw = cmd;
3536         lredata->count = count;
3537         set_ch_t(&lredata->seek_addr, begcyl, beghead);
3538         lredata->search_arg.cyl = lredata->seek_addr.cyl;
3539         lredata->search_arg.head = lredata->seek_addr.head;
3540         lredata->search_arg.record = rec_on_trk;
3541
3542         dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
3543                      &pfxdata, sizeof(pfxdata), total_data_size);
3544         return PTR_ERR_OR_ZERO(dcw);
3545 }
3546
3547 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
3548                                                struct dasd_device *startdev,
3549                                                struct dasd_block *block,
3550                                                struct request *req,
3551                                                sector_t first_rec,
3552                                                sector_t last_rec,
3553                                                sector_t first_trk,
3554                                                sector_t last_trk,
3555                                                unsigned int first_offs,
3556                                                unsigned int last_offs,
3557                                                unsigned int blk_per_trk,
3558                                                unsigned int blksize)
3559 {
3560         struct dasd_ccw_req *cqr;
3561         struct req_iterator iter;
3562         struct bio_vec bv;
3563         char *dst;
3564         unsigned int trkcount, ctidaw;
3565         unsigned char cmd;
3566         struct dasd_device *basedev;
3567         unsigned int tlf;
3568         struct itcw *itcw;
3569         struct tidaw *last_tidaw = NULL;
3570         int itcw_op;
3571         size_t itcw_size;
3572         u8 tidaw_flags;
3573         unsigned int seg_len, part_len, len_to_track_end;
3574         unsigned char new_track;
3575         sector_t recid, trkid;
3576         unsigned int offs;
3577         unsigned int count, count_to_trk_end;
3578         int ret;
3579
3580         basedev = block->base;
3581         if (rq_data_dir(req) == READ) {
3582                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
3583                 itcw_op = ITCW_OP_READ;
3584         } else if (rq_data_dir(req) == WRITE) {
3585                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
3586                 itcw_op = ITCW_OP_WRITE;
3587         } else
3588                 return ERR_PTR(-EINVAL);
3589
3590         /* trackbased I/O needs address all memory via TIDAWs,
3591          * not just for 64 bit addresses. This allows us to map
3592          * each segment directly to one tidaw.
3593          * In the case of write requests, additional tidaws may
3594          * be needed when a segment crosses a track boundary.
3595          */
3596         trkcount = last_trk - first_trk + 1;
3597         ctidaw = 0;
3598         rq_for_each_segment(bv, req, iter) {
3599                 ++ctidaw;
3600         }
3601         if (rq_data_dir(req) == WRITE)
3602                 ctidaw += (last_trk - first_trk);
3603
3604         /* Allocate the ccw request. */
3605         itcw_size = itcw_calc_size(0, ctidaw, 0);
3606         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev,
3607                                    blk_mq_rq_to_pdu(req));
3608         if (IS_ERR(cqr))
3609                 return cqr;
3610
3611         /* transfer length factor: how many bytes to read from the last track */
3612         if (first_trk == last_trk)
3613                 tlf = last_offs - first_offs + 1;
3614         else
3615                 tlf = last_offs + 1;
3616         tlf *= blksize;
3617
3618         itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
3619         if (IS_ERR(itcw)) {
3620                 ret = -EINVAL;
3621                 goto out_error;
3622         }
3623         cqr->cpaddr = itcw_get_tcw(itcw);
3624         if (prepare_itcw(itcw, first_trk, last_trk,
3625                          cmd, basedev, startdev,
3626                          first_offs + 1,
3627                          trkcount, blksize,
3628                          (last_rec - first_rec + 1) * blksize,
3629                          tlf, blk_per_trk) == -EAGAIN) {
3630                 /* Clock not in sync and XRC is enabled.
3631                  * Try again later.
3632                  */
3633                 ret = -EAGAIN;
3634                 goto out_error;
3635         }
3636         len_to_track_end = 0;
3637         /*
3638          * A tidaw can address 4k of memory, but must not cross page boundaries
3639          * We can let the block layer handle this by setting
3640          * blk_queue_segment_boundary to page boundaries and
3641          * blk_max_segment_size to page size when setting up the request queue.
3642          * For write requests, a TIDAW must not cross track boundaries, because
3643          * we have to set the CBC flag on the last tidaw for each track.
3644          */
3645         if (rq_data_dir(req) == WRITE) {
3646                 new_track = 1;
3647                 recid = first_rec;
3648                 rq_for_each_segment(bv, req, iter) {
3649                         dst = page_address(bv.bv_page) + bv.bv_offset;
3650                         seg_len = bv.bv_len;
3651                         while (seg_len) {
3652                                 if (new_track) {
3653                                         trkid = recid;
3654                                         offs = sector_div(trkid, blk_per_trk);
3655                                         count_to_trk_end = blk_per_trk - offs;
3656                                         count = min((last_rec - recid + 1),
3657                                                     (sector_t)count_to_trk_end);
3658                                         len_to_track_end = count * blksize;
3659                                         recid += count;
3660                                         new_track = 0;
3661                                 }
3662                                 part_len = min(seg_len, len_to_track_end);
3663                                 seg_len -= part_len;
3664                                 len_to_track_end -= part_len;
3665                                 /* We need to end the tidaw at track end */
3666                                 if (!len_to_track_end) {
3667                                         new_track = 1;
3668                                         tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
3669                                 } else
3670                                         tidaw_flags = 0;
3671                                 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
3672                                                             dst, part_len);
3673                                 if (IS_ERR(last_tidaw)) {
3674                                         ret = -EINVAL;
3675                                         goto out_error;
3676                                 }
3677                                 dst += part_len;
3678                         }
3679                 }
3680         } else {
3681                 rq_for_each_segment(bv, req, iter) {
3682                         dst = page_address(bv.bv_page) + bv.bv_offset;
3683                         last_tidaw = itcw_add_tidaw(itcw, 0x00,
3684                                                     dst, bv.bv_len);
3685                         if (IS_ERR(last_tidaw)) {
3686                                 ret = -EINVAL;
3687                                 goto out_error;
3688                         }
3689                 }
3690         }
3691         last_tidaw->flags |= TIDAW_FLAGS_LAST;
3692         last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
3693         itcw_finalize(itcw);
3694
3695         if (blk_noretry_request(req) ||
3696             block->base->features & DASD_FEATURE_FAILFAST)
3697                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3698         cqr->cpmode = 1;
3699         cqr->startdev = startdev;
3700         cqr->memdev = startdev;
3701         cqr->block = block;
3702         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
3703         cqr->lpm = dasd_path_get_ppm(startdev);
3704         cqr->retries = startdev->default_retries;
3705         cqr->buildclk = get_tod_clock();
3706         cqr->status = DASD_CQR_FILLED;
3707         return cqr;
3708 out_error:
3709         dasd_sfree_request(cqr, startdev);
3710         return ERR_PTR(ret);
3711 }
3712
3713 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
3714                                                struct dasd_block *block,
3715                                                struct request *req)
3716 {
3717         int cmdrtd, cmdwtd;
3718         int use_prefix;
3719         int fcx_multitrack;
3720         struct dasd_eckd_private *private;
3721         struct dasd_device *basedev;
3722         sector_t first_rec, last_rec;
3723         sector_t first_trk, last_trk;
3724         unsigned int first_offs, last_offs;
3725         unsigned int blk_per_trk, blksize;
3726         int cdlspecial;
3727         unsigned int data_size;
3728         struct dasd_ccw_req *cqr;
3729
3730         basedev = block->base;
3731         private = basedev->private;
3732
3733         /* Calculate number of blocks/records per track. */
3734         blksize = block->bp_block;
3735         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3736         if (blk_per_trk == 0)
3737                 return ERR_PTR(-EINVAL);
3738         /* Calculate record id of first and last block. */
3739         first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
3740         first_offs = sector_div(first_trk, blk_per_trk);
3741         last_rec = last_trk =
3742                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3743         last_offs = sector_div(last_trk, blk_per_trk);
3744         cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
3745
3746         fcx_multitrack = private->features.feature[40] & 0x20;
3747         data_size = blk_rq_bytes(req);
3748         if (data_size % blksize)
3749                 return ERR_PTR(-EINVAL);
3750         /* tpm write request add CBC data on each track boundary */
3751         if (rq_data_dir(req) == WRITE)
3752                 data_size += (last_trk - first_trk) * 4;
3753
3754         /* is read track data and write track data in command mode supported? */
3755         cmdrtd = private->features.feature[9] & 0x20;
3756         cmdwtd = private->features.feature[12] & 0x40;
3757         use_prefix = private->features.feature[8] & 0x01;
3758
3759         cqr = NULL;
3760         if (cdlspecial || dasd_page_cache) {
3761                 /* do nothing, just fall through to the cmd mode single case */
3762         } else if ((data_size <= private->fcx_max_data)
3763                    && (fcx_multitrack || (first_trk == last_trk))) {
3764                 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
3765                                                     first_rec, last_rec,
3766                                                     first_trk, last_trk,
3767                                                     first_offs, last_offs,
3768                                                     blk_per_trk, blksize);
3769                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3770                     (PTR_ERR(cqr) != -ENOMEM))
3771                         cqr = NULL;
3772         } else if (use_prefix &&
3773                    (((rq_data_dir(req) == READ) && cmdrtd) ||
3774                     ((rq_data_dir(req) == WRITE) && cmdwtd))) {
3775                 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
3776                                                    first_rec, last_rec,
3777                                                    first_trk, last_trk,
3778                                                    first_offs, last_offs,
3779                                                    blk_per_trk, blksize);
3780                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3781                     (PTR_ERR(cqr) != -ENOMEM))
3782                         cqr = NULL;
3783         }
3784         if (!cqr)
3785                 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
3786                                                     first_rec, last_rec,
3787                                                     first_trk, last_trk,
3788                                                     first_offs, last_offs,
3789                                                     blk_per_trk, blksize);
3790         return cqr;
3791 }
3792
3793 static struct dasd_ccw_req *dasd_eckd_build_cp_raw(struct dasd_device *startdev,
3794                                                    struct dasd_block *block,
3795                                                    struct request *req)
3796 {
3797         sector_t start_padding_sectors, end_sector_offset, end_padding_sectors;
3798         unsigned int seg_len, len_to_track_end;
3799         unsigned int cidaw, cplength, datasize;
3800         sector_t first_trk, last_trk, sectors;
3801         struct dasd_eckd_private *base_priv;
3802         struct dasd_device *basedev;
3803         struct req_iterator iter;
3804         struct dasd_ccw_req *cqr;
3805         unsigned int first_offs;
3806         unsigned int trkcount;
3807         unsigned long *idaws;
3808         unsigned int size;
3809         unsigned char cmd;
3810         struct bio_vec bv;
3811         struct ccw1 *ccw;
3812         int use_prefix;
3813         void *data;
3814         char *dst;
3815
3816         /*
3817          * raw track access needs to be mutiple of 64k and on 64k boundary
3818          * For read requests we can fix an incorrect alignment by padding
3819          * the request with dummy pages.
3820          */
3821         start_padding_sectors = blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK;
3822         end_sector_offset = (blk_rq_pos(req) + blk_rq_sectors(req)) %
3823                 DASD_RAW_SECTORS_PER_TRACK;
3824         end_padding_sectors = (DASD_RAW_SECTORS_PER_TRACK - end_sector_offset) %
3825                 DASD_RAW_SECTORS_PER_TRACK;
3826         basedev = block->base;
3827         if ((start_padding_sectors || end_padding_sectors) &&
3828             (rq_data_dir(req) == WRITE)) {
3829                 DBF_DEV_EVENT(DBF_ERR, basedev,
3830                               "raw write not track aligned (%lu,%lu) req %p",
3831                               start_padding_sectors, end_padding_sectors, req);
3832                 return ERR_PTR(-EINVAL);
3833         }
3834
3835         first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
3836         last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
3837                 DASD_RAW_SECTORS_PER_TRACK;
3838         trkcount = last_trk - first_trk + 1;
3839         first_offs = 0;
3840
3841         if (rq_data_dir(req) == READ)
3842                 cmd = DASD_ECKD_CCW_READ_TRACK;
3843         else if (rq_data_dir(req) == WRITE)
3844                 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
3845         else
3846                 return ERR_PTR(-EINVAL);
3847
3848         /*
3849          * Raw track based I/O needs IDAWs for each page,
3850          * and not just for 64 bit addresses.
3851          */
3852         cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
3853
3854         /*
3855          * struct PFX_eckd_data and struct LRE_eckd_data can have up to 2 bytes
3856          * of extended parameter. This is needed for write full track.
3857          */
3858         base_priv = basedev->private;
3859         use_prefix = base_priv->features.feature[8] & 0x01;
3860         if (use_prefix) {
3861                 cplength = 1 + trkcount;
3862                 size = sizeof(struct PFX_eckd_data) + 2;
3863         } else {
3864                 cplength = 2 + trkcount;
3865                 size = sizeof(struct DE_eckd_data) +
3866                         sizeof(struct LRE_eckd_data) + 2;
3867         }
3868         size = ALIGN(size, 8);
3869
3870         datasize = size + cidaw * sizeof(unsigned long);
3871
3872         /* Allocate the ccw request. */
3873         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
3874                                    datasize, startdev, blk_mq_rq_to_pdu(req));
3875         if (IS_ERR(cqr))
3876                 return cqr;
3877
3878         ccw = cqr->cpaddr;
3879         data = cqr->data;
3880
3881         if (use_prefix) {
3882                 prefix_LRE(ccw++, data, first_trk, last_trk, cmd, basedev,
3883                            startdev, 1, first_offs + 1, trkcount, 0, 0);
3884         } else {
3885                 define_extent(ccw++, data, first_trk, last_trk, cmd, basedev, 0);
3886                 ccw[-1].flags |= CCW_FLAG_CC;
3887
3888                 data += sizeof(struct DE_eckd_data);
3889                 locate_record_ext(ccw++, data, first_trk, first_offs + 1,
3890                                   trkcount, cmd, basedev, 0, 0);
3891         }
3892
3893         idaws = (unsigned long *)(cqr->data + size);
3894         len_to_track_end = 0;
3895         if (start_padding_sectors) {
3896                 ccw[-1].flags |= CCW_FLAG_CC;
3897                 ccw->cmd_code = cmd;
3898                 /* maximum 3390 track size */
3899                 ccw->count = 57326;
3900                 /* 64k map to one track */
3901                 len_to_track_end = 65536 - start_padding_sectors * 512;
3902                 ccw->cda = (__u32)(addr_t)idaws;
3903                 ccw->flags |= CCW_FLAG_IDA;
3904                 ccw->flags |= CCW_FLAG_SLI;
3905                 ccw++;
3906                 for (sectors = 0; sectors < start_padding_sectors; sectors += 8)
3907                         idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3908         }
3909         rq_for_each_segment(bv, req, iter) {
3910                 dst = page_address(bv.bv_page) + bv.bv_offset;
3911                 seg_len = bv.bv_len;
3912                 if (cmd == DASD_ECKD_CCW_READ_TRACK)
3913                         memset(dst, 0, seg_len);
3914                 if (!len_to_track_end) {
3915                         ccw[-1].flags |= CCW_FLAG_CC;
3916                         ccw->cmd_code = cmd;
3917                         /* maximum 3390 track size */
3918                         ccw->count = 57326;
3919                         /* 64k map to one track */
3920                         len_to_track_end = 65536;
3921                         ccw->cda = (__u32)(addr_t)idaws;
3922                         ccw->flags |= CCW_FLAG_IDA;
3923                         ccw->flags |= CCW_FLAG_SLI;
3924                         ccw++;
3925                 }
3926                 len_to_track_end -= seg_len;
3927                 idaws = idal_create_words(idaws, dst, seg_len);
3928         }
3929         for (sectors = 0; sectors < end_padding_sectors; sectors += 8)
3930                 idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3931         if (blk_noretry_request(req) ||
3932             block->base->features & DASD_FEATURE_FAILFAST)
3933                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3934         cqr->startdev = startdev;
3935         cqr->memdev = startdev;
3936         cqr->block = block;
3937         cqr->expires = startdev->default_expires * HZ;
3938         cqr->lpm = dasd_path_get_ppm(startdev);
3939         cqr->retries = startdev->default_retries;
3940         cqr->buildclk = get_tod_clock();
3941         cqr->status = DASD_CQR_FILLED;
3942
3943         return cqr;
3944 }
3945
3946
3947 static int
3948 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
3949 {
3950         struct dasd_eckd_private *private;
3951         struct ccw1 *ccw;
3952         struct req_iterator iter;
3953         struct bio_vec bv;
3954         char *dst, *cda;
3955         unsigned int blksize, blk_per_trk, off;
3956         sector_t recid;
3957         int status;
3958
3959         if (!dasd_page_cache)
3960                 goto out;
3961         private = cqr->block->base->private;
3962         blksize = cqr->block->bp_block;
3963         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3964         recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
3965         ccw = cqr->cpaddr;
3966         /* Skip over define extent & locate record. */
3967         ccw++;
3968         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
3969                 ccw++;
3970         rq_for_each_segment(bv, req, iter) {
3971                 dst = page_address(bv.bv_page) + bv.bv_offset;
3972                 for (off = 0; off < bv.bv_len; off += blksize) {
3973                         /* Skip locate record. */
3974                         if (private->uses_cdl && recid <= 2*blk_per_trk)
3975                                 ccw++;
3976                         if (dst) {
3977                                 if (ccw->flags & CCW_FLAG_IDA)
3978                                         cda = *((char **)((addr_t) ccw->cda));
3979                                 else
3980                                         cda = (char *)((addr_t) ccw->cda);
3981                                 if (dst != cda) {
3982                                         if (rq_data_dir(req) == READ)
3983                                                 memcpy(dst, cda, bv.bv_len);
3984                                         kmem_cache_free(dasd_page_cache,
3985                                             (void *)((addr_t)cda & PAGE_MASK));
3986                                 }
3987                                 dst = NULL;
3988                         }
3989                         ccw++;
3990                         recid++;
3991                 }
3992         }
3993 out:
3994         status = cqr->status == DASD_CQR_DONE;
3995         dasd_sfree_request(cqr, cqr->memdev);
3996         return status;
3997 }
3998
3999 /*
4000  * Modify ccw/tcw in cqr so it can be started on a base device.
4001  *
4002  * Note that this is not enough to restart the cqr!
4003  * Either reset cqr->startdev as well (summary unit check handling)
4004  * or restart via separate cqr (as in ERP handling).
4005  */
4006 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
4007 {
4008         struct ccw1 *ccw;
4009         struct PFX_eckd_data *pfxdata;
4010         struct tcw *tcw;
4011         struct tccb *tccb;
4012         struct dcw *dcw;
4013
4014         if (cqr->cpmode == 1) {
4015                 tcw = cqr->cpaddr;
4016                 tccb = tcw_get_tccb(tcw);
4017                 dcw = (struct dcw *)&tccb->tca[0];
4018                 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
4019                 pfxdata->validity.verify_base = 0;
4020                 pfxdata->validity.hyper_pav = 0;
4021         } else {
4022                 ccw = cqr->cpaddr;
4023                 pfxdata = cqr->data;
4024                 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
4025                         pfxdata->validity.verify_base = 0;
4026                         pfxdata->validity.hyper_pav = 0;
4027                 }
4028         }
4029 }
4030
4031 #define DASD_ECKD_CHANQ_MAX_SIZE 4
4032
4033 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
4034                                                      struct dasd_block *block,
4035                                                      struct request *req)
4036 {
4037         struct dasd_eckd_private *private;
4038         struct dasd_device *startdev;
4039         unsigned long flags;
4040         struct dasd_ccw_req *cqr;
4041
4042         startdev = dasd_alias_get_start_dev(base);
4043         if (!startdev)
4044                 startdev = base;
4045         private = startdev->private;
4046         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
4047                 return ERR_PTR(-EBUSY);
4048
4049         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
4050         private->count++;
4051         if ((base->features & DASD_FEATURE_USERAW))
4052                 cqr = dasd_eckd_build_cp_raw(startdev, block, req);
4053         else
4054                 cqr = dasd_eckd_build_cp(startdev, block, req);
4055         if (IS_ERR(cqr))
4056                 private->count--;
4057         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
4058         return cqr;
4059 }
4060
4061 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
4062                                    struct request *req)
4063 {
4064         struct dasd_eckd_private *private;
4065         unsigned long flags;
4066
4067         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
4068         private = cqr->memdev->private;
4069         private->count--;
4070         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
4071         return dasd_eckd_free_cp(cqr, req);
4072 }
4073
4074 static int
4075 dasd_eckd_fill_info(struct dasd_device * device,
4076                     struct dasd_information2_t * info)
4077 {
4078         struct dasd_eckd_private *private = device->private;
4079
4080         info->label_block = 2;
4081         info->FBA_layout = private->uses_cdl ? 0 : 1;
4082         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
4083         info->characteristics_size = sizeof(private->rdc_data);
4084         memcpy(info->characteristics, &private->rdc_data,
4085                sizeof(private->rdc_data));
4086         info->confdata_size = min((unsigned long)private->conf_len,
4087                                   sizeof(info->configuration_data));
4088         memcpy(info->configuration_data, private->conf_data,
4089                info->confdata_size);
4090         return 0;
4091 }
4092
4093 /*
4094  * SECTION: ioctl functions for eckd devices.
4095  */
4096
4097 /*
4098  * Release device ioctl.
4099  * Buils a channel programm to releases a prior reserved
4100  * (see dasd_eckd_reserve) device.
4101  */
4102 static int
4103 dasd_eckd_release(struct dasd_device *device)
4104 {
4105         struct dasd_ccw_req *cqr;
4106         int rc;
4107         struct ccw1 *ccw;
4108         int useglobal;
4109
4110         if (!capable(CAP_SYS_ADMIN))
4111                 return -EACCES;
4112
4113         useglobal = 0;
4114         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
4115         if (IS_ERR(cqr)) {
4116                 mutex_lock(&dasd_reserve_mutex);
4117                 useglobal = 1;
4118                 cqr = &dasd_reserve_req->cqr;
4119                 memset(cqr, 0, sizeof(*cqr));
4120                 memset(&dasd_reserve_req->ccw, 0,
4121                        sizeof(dasd_reserve_req->ccw));
4122                 cqr->cpaddr = &dasd_reserve_req->ccw;
4123                 cqr->data = &dasd_reserve_req->data;
4124                 cqr->magic = DASD_ECKD_MAGIC;
4125         }
4126         ccw = cqr->cpaddr;
4127         ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
4128         ccw->flags |= CCW_FLAG_SLI;
4129         ccw->count = 32;
4130         ccw->cda = (__u32)(addr_t) cqr->data;
4131         cqr->startdev = device;
4132         cqr->memdev = device;
4133         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4134         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4135         cqr->retries = 2;       /* set retry counter to enable basic ERP */
4136         cqr->expires = 2 * HZ;
4137         cqr->buildclk = get_tod_clock();
4138         cqr->status = DASD_CQR_FILLED;
4139
4140         rc = dasd_sleep_on_immediatly(cqr);
4141         if (!rc)
4142                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
4143
4144         if (useglobal)
4145                 mutex_unlock(&dasd_reserve_mutex);
4146         else
4147                 dasd_sfree_request(cqr, cqr->memdev);
4148         return rc;
4149 }
4150
4151 /*
4152  * Reserve device ioctl.
4153  * Options are set to 'synchronous wait for interrupt' and
4154  * 'timeout the request'. This leads to a terminate IO if
4155  * the interrupt is outstanding for a certain time.
4156  */
4157 static int
4158 dasd_eckd_reserve(struct dasd_device *device)
4159 {
4160         struct dasd_ccw_req *cqr;
4161         int rc;
4162         struct ccw1 *ccw;
4163         int useglobal;
4164
4165         if (!capable(CAP_SYS_ADMIN))
4166                 return -EACCES;
4167
4168         useglobal = 0;
4169         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
4170         if (IS_ERR(cqr)) {
4171                 mutex_lock(&dasd_reserve_mutex);
4172                 useglobal = 1;
4173                 cqr = &dasd_reserve_req->cqr;
4174                 memset(cqr, 0, sizeof(*cqr));
4175                 memset(&dasd_reserve_req->ccw, 0,
4176                        sizeof(dasd_reserve_req->ccw));
4177                 cqr->cpaddr = &dasd_reserve_req->ccw;
4178                 cqr->data = &dasd_reserve_req->data;
4179                 cqr->magic = DASD_ECKD_MAGIC;
4180         }
4181         ccw = cqr->cpaddr;
4182         ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
4183         ccw->flags |= CCW_FLAG_SLI;
4184         ccw->count = 32;
4185         ccw->cda = (__u32)(addr_t) cqr->data;
4186         cqr->startdev = device;
4187         cqr->memdev = device;
4188         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4189         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4190         cqr->retries = 2;       /* set retry counter to enable basic ERP */
4191         cqr->expires = 2 * HZ;
4192         cqr->buildclk = get_tod_clock();
4193         cqr->status = DASD_CQR_FILLED;
4194
4195         rc = dasd_sleep_on_immediatly(cqr);
4196         if (!rc)
4197                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
4198
4199         if (useglobal)
4200                 mutex_unlock(&dasd_reserve_mutex);
4201         else
4202                 dasd_sfree_request(cqr, cqr->memdev);
4203         return rc;
4204 }
4205
4206 /*
4207  * Steal lock ioctl - unconditional reserve device.
4208  * Buils a channel programm to break a device's reservation.
4209  * (unconditional reserve)
4210  */
4211 static int
4212 dasd_eckd_steal_lock(struct dasd_device *device)
4213 {
4214         struct dasd_ccw_req *cqr;
4215         int rc;
4216         struct ccw1 *ccw;
4217         int useglobal;
4218
4219         if (!capable(CAP_SYS_ADMIN))
4220                 return -EACCES;
4221
4222         useglobal = 0;
4223         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
4224         if (IS_ERR(cqr)) {
4225                 mutex_lock(&dasd_reserve_mutex);
4226                 useglobal = 1;
4227                 cqr = &dasd_reserve_req->cqr;
4228                 memset(cqr, 0, sizeof(*cqr));
4229                 memset(&dasd_reserve_req->ccw, 0,
4230                        sizeof(dasd_reserve_req->ccw));
4231                 cqr->cpaddr = &dasd_reserve_req->ccw;
4232                 cqr->data = &dasd_reserve_req->data;
4233                 cqr->magic = DASD_ECKD_MAGIC;
4234         }
4235         ccw = cqr->cpaddr;
4236         ccw->cmd_code = DASD_ECKD_CCW_SLCK;
4237         ccw->flags |= CCW_FLAG_SLI;
4238         ccw->count = 32;
4239         ccw->cda = (__u32)(addr_t) cqr->data;
4240         cqr->startdev = device;
4241         cqr->memdev = device;
4242         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4243         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4244         cqr->retries = 2;       /* set retry counter to enable basic ERP */
4245         cqr->expires = 2 * HZ;
4246         cqr->buildclk = get_tod_clock();
4247         cqr->status = DASD_CQR_FILLED;
4248
4249         rc = dasd_sleep_on_immediatly(cqr);
4250         if (!rc)
4251                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
4252
4253         if (useglobal)
4254                 mutex_unlock(&dasd_reserve_mutex);
4255         else
4256                 dasd_sfree_request(cqr, cqr->memdev);
4257         return rc;
4258 }
4259
4260 /*
4261  * SNID - Sense Path Group ID
4262  * This ioctl may be used in situations where I/O is stalled due to
4263  * a reserve, so if the normal dasd_smalloc_request fails, we use the
4264  * preallocated dasd_reserve_req.
4265  */
4266 static int dasd_eckd_snid(struct dasd_device *device,
4267                           void __user *argp)
4268 {
4269         struct dasd_ccw_req *cqr;
4270         int rc;
4271         struct ccw1 *ccw;
4272         int useglobal;
4273         struct dasd_snid_ioctl_data usrparm;
4274
4275         if (!capable(CAP_SYS_ADMIN))
4276                 return -EACCES;
4277
4278         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
4279                 return -EFAULT;
4280
4281         useglobal = 0;
4282         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
4283                                    sizeof(struct dasd_snid_data), device,
4284                                    NULL);
4285         if (IS_ERR(cqr)) {
4286                 mutex_lock(&dasd_reserve_mutex);
4287                 useglobal = 1;
4288                 cqr = &dasd_reserve_req->cqr;
4289                 memset(cqr, 0, sizeof(*cqr));
4290                 memset(&dasd_reserve_req->ccw, 0,
4291                        sizeof(dasd_reserve_req->ccw));
4292                 cqr->cpaddr = &dasd_reserve_req->ccw;
4293                 cqr->data = &dasd_reserve_req->data;
4294                 cqr->magic = DASD_ECKD_MAGIC;
4295         }
4296         ccw = cqr->cpaddr;
4297         ccw->cmd_code = DASD_ECKD_CCW_SNID;
4298         ccw->flags |= CCW_FLAG_SLI;
4299         ccw->count = 12;
4300         ccw->cda = (__u32)(addr_t) cqr->data;
4301         cqr->startdev = device;
4302         cqr->memdev = device;
4303         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4304         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4305         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
4306         cqr->retries = 5;
4307         cqr->expires = 10 * HZ;
4308         cqr->buildclk = get_tod_clock();
4309         cqr->status = DASD_CQR_FILLED;
4310         cqr->lpm = usrparm.path_mask;
4311
4312         rc = dasd_sleep_on_immediatly(cqr);
4313         /* verify that I/O processing didn't modify the path mask */
4314         if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
4315                 rc = -EIO;
4316         if (!rc) {
4317                 usrparm.data = *((struct dasd_snid_data *)cqr->data);
4318                 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
4319                         rc = -EFAULT;
4320         }
4321
4322         if (useglobal)
4323                 mutex_unlock(&dasd_reserve_mutex);
4324         else
4325                 dasd_sfree_request(cqr, cqr->memdev);
4326         return rc;
4327 }
4328
4329 /*
4330  * Read performance statistics
4331  */
4332 static int
4333 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
4334 {
4335         struct dasd_psf_prssd_data *prssdp;
4336         struct dasd_rssd_perf_stats_t *stats;
4337         struct dasd_ccw_req *cqr;
4338         struct ccw1 *ccw;
4339         int rc;
4340
4341         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */  + 1 /* RSSD */,
4342                                    (sizeof(struct dasd_psf_prssd_data) +
4343                                     sizeof(struct dasd_rssd_perf_stats_t)),
4344                                    device, NULL);
4345         if (IS_ERR(cqr)) {
4346                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4347                             "Could not allocate initialization request");
4348                 return PTR_ERR(cqr);
4349         }
4350         cqr->startdev = device;
4351         cqr->memdev = device;
4352         cqr->retries = 0;
4353         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4354         cqr->expires = 10 * HZ;
4355
4356         /* Prepare for Read Subsystem Data */
4357         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
4358         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
4359         prssdp->order = PSF_ORDER_PRSSD;
4360         prssdp->suborder = 0x01;        /* Performance Statistics */
4361         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
4362
4363         ccw = cqr->cpaddr;
4364         ccw->cmd_code = DASD_ECKD_CCW_PSF;
4365         ccw->count = sizeof(struct dasd_psf_prssd_data);
4366         ccw->flags |= CCW_FLAG_CC;
4367         ccw->cda = (__u32)(addr_t) prssdp;
4368
4369         /* Read Subsystem Data - Performance Statistics */
4370         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
4371         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
4372
4373         ccw++;
4374         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
4375         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
4376         ccw->cda = (__u32)(addr_t) stats;
4377
4378         cqr->buildclk = get_tod_clock();
4379         cqr->status = DASD_CQR_FILLED;
4380         rc = dasd_sleep_on(cqr);
4381         if (rc == 0) {
4382                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
4383                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
4384                 if (copy_to_user(argp, stats,
4385                                  sizeof(struct dasd_rssd_perf_stats_t)))
4386                         rc = -EFAULT;
4387         }
4388         dasd_sfree_request(cqr, cqr->memdev);
4389         return rc;
4390 }
4391
4392 /*
4393  * Get attributes (cache operations)
4394  * Returnes the cache attributes used in Define Extend (DE).
4395  */
4396 static int
4397 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
4398 {
4399         struct dasd_eckd_private *private = device->private;
4400         struct attrib_data_t attrib = private->attrib;
4401         int rc;
4402
4403         if (!capable(CAP_SYS_ADMIN))
4404                 return -EACCES;
4405         if (!argp)
4406                 return -EINVAL;
4407
4408         rc = 0;
4409         if (copy_to_user(argp, (long *) &attrib,
4410                          sizeof(struct attrib_data_t)))
4411                 rc = -EFAULT;
4412
4413         return rc;
4414 }
4415
4416 /*
4417  * Set attributes (cache operations)
4418  * Stores the attributes for cache operation to be used in Define Extend (DE).
4419  */
4420 static int
4421 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
4422 {
4423         struct dasd_eckd_private *private = device->private;
4424         struct attrib_data_t attrib;
4425
4426         if (!capable(CAP_SYS_ADMIN))
4427                 return -EACCES;
4428         if (!argp)
4429                 return -EINVAL;
4430
4431         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
4432                 return -EFAULT;
4433         private->attrib = attrib;
4434
4435         dev_info(&device->cdev->dev,
4436                  "The DASD cache mode was set to %x (%i cylinder prestage)\n",
4437                  private->attrib.operation, private->attrib.nr_cyl);
4438         return 0;
4439 }
4440
4441 /*
4442  * Issue syscall I/O to EMC Symmetrix array.
4443  * CCWs are PSF and RSSD
4444  */
4445 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
4446 {
4447         struct dasd_symmio_parms usrparm;
4448         char *psf_data, *rssd_result;
4449         struct dasd_ccw_req *cqr;
4450         struct ccw1 *ccw;
4451         char psf0, psf1;
4452         int rc;
4453
4454         if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
4455                 return -EACCES;
4456         psf0 = psf1 = 0;
4457
4458         /* Copy parms from caller */
4459         rc = -EFAULT;
4460         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
4461                 goto out;
4462         if (is_compat_task()) {
4463                 /* Make sure pointers are sane even on 31 bit. */
4464                 rc = -EINVAL;
4465                 if ((usrparm.psf_data >> 32) != 0)
4466                         goto out;
4467                 if ((usrparm.rssd_result >> 32) != 0)
4468                         goto out;
4469                 usrparm.psf_data &= 0x7fffffffULL;
4470                 usrparm.rssd_result &= 0x7fffffffULL;
4471         }
4472         /* alloc I/O data area */
4473         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
4474         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
4475         if (!psf_data || !rssd_result) {
4476                 rc = -ENOMEM;
4477                 goto out_free;
4478         }
4479
4480         /* get syscall header from user space */
4481         rc = -EFAULT;
4482         if (copy_from_user(psf_data,
4483                            (void __user *)(unsigned long) usrparm.psf_data,
4484                            usrparm.psf_data_len))
4485                 goto out_free;
4486         psf0 = psf_data[0];
4487         psf1 = psf_data[1];
4488
4489         /* setup CCWs for PSF + RSSD */
4490         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2, 0, device, NULL);
4491         if (IS_ERR(cqr)) {
4492                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4493                         "Could not allocate initialization request");
4494                 rc = PTR_ERR(cqr);
4495                 goto out_free;
4496         }
4497
4498         cqr->startdev = device;
4499         cqr->memdev = device;
4500         cqr->retries = 3;
4501         cqr->expires = 10 * HZ;
4502         cqr->buildclk = get_tod_clock();
4503         cqr->status = DASD_CQR_FILLED;
4504
4505         /* Build the ccws */
4506         ccw = cqr->cpaddr;
4507
4508         /* PSF ccw */
4509         ccw->cmd_code = DASD_ECKD_CCW_PSF;
4510         ccw->count = usrparm.psf_data_len;
4511         ccw->flags |= CCW_FLAG_CC;
4512         ccw->cda = (__u32)(addr_t) psf_data;
4513
4514         ccw++;
4515
4516         /* RSSD ccw  */
4517         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
4518         ccw->count = usrparm.rssd_result_len;
4519         ccw->flags = CCW_FLAG_SLI ;
4520         ccw->cda = (__u32)(addr_t) rssd_result;
4521
4522         rc = dasd_sleep_on(cqr);
4523         if (rc)
4524                 goto out_sfree;
4525
4526         rc = -EFAULT;
4527         if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
4528                            rssd_result, usrparm.rssd_result_len))
4529                 goto out_sfree;
4530         rc = 0;
4531
4532 out_sfree:
4533         dasd_sfree_request(cqr, cqr->memdev);
4534 out_free:
4535         kfree(rssd_result);
4536         kfree(psf_data);
4537 out:
4538         DBF_DEV_EVENT(DBF_WARNING, device,
4539                       "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
4540                       (int) psf0, (int) psf1, rc);
4541         return rc;
4542 }
4543
4544 static int
4545 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
4546 {
4547         struct dasd_device *device = block->base;
4548
4549         switch (cmd) {
4550         case BIODASDGATTR:
4551                 return dasd_eckd_get_attrib(device, argp);
4552         case BIODASDSATTR:
4553                 return dasd_eckd_set_attrib(device, argp);
4554         case BIODASDPSRD:
4555                 return dasd_eckd_performance(device, argp);
4556         case BIODASDRLSE:
4557                 return dasd_eckd_release(device);
4558         case BIODASDRSRV:
4559                 return dasd_eckd_reserve(device);
4560         case BIODASDSLCK:
4561                 return dasd_eckd_steal_lock(device);
4562         case BIODASDSNID:
4563                 return dasd_eckd_snid(device, argp);
4564         case BIODASDSYMMIO:
4565                 return dasd_symm_io(device, argp);
4566         default:
4567                 return -ENOTTY;
4568         }
4569 }
4570
4571 /*
4572  * Dump the range of CCWs into 'page' buffer
4573  * and return number of printed chars.
4574  */
4575 static int
4576 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
4577 {
4578         int len, count;
4579         char *datap;
4580
4581         len = 0;
4582         while (from <= to) {
4583                 len += sprintf(page + len, PRINTK_HEADER
4584                                " CCW %p: %08X %08X DAT:",
4585                                from, ((int *) from)[0], ((int *) from)[1]);
4586
4587                 /* get pointer to data (consider IDALs) */
4588                 if (from->flags & CCW_FLAG_IDA)
4589                         datap = (char *) *((addr_t *) (addr_t) from->cda);
4590                 else
4591                         datap = (char *) ((addr_t) from->cda);
4592
4593                 /* dump data (max 32 bytes) */
4594                 for (count = 0; count < from->count && count < 32; count++) {
4595                         if (count % 8 == 0) len += sprintf(page + len, " ");
4596                         if (count % 4 == 0) len += sprintf(page + len, " ");
4597                         len += sprintf(page + len, "%02x", datap[count]);
4598                 }
4599                 len += sprintf(page + len, "\n");
4600                 from++;
4601         }
4602         return len;
4603 }
4604
4605 static void
4606 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
4607                          char *reason)
4608 {
4609         u64 *sense;
4610         u64 *stat;
4611
4612         sense = (u64 *) dasd_get_sense(irb);
4613         stat = (u64 *) &irb->scsw;
4614         if (sense) {
4615                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
4616                               "%016llx %016llx %016llx %016llx",
4617                               reason, *stat, *((u32 *) (stat + 1)),
4618                               sense[0], sense[1], sense[2], sense[3]);
4619         } else {
4620                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
4621                               reason, *stat, *((u32 *) (stat + 1)),
4622                               "NO VALID SENSE");
4623         }
4624 }
4625
4626 /*
4627  * Print sense data and related channel program.
4628  * Parts are printed because printk buffer is only 1024 bytes.
4629  */
4630 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
4631                                  struct dasd_ccw_req *req, struct irb *irb)
4632 {
4633         char *page;
4634         struct ccw1 *first, *last, *fail, *from, *to;
4635         int len, sl, sct;
4636
4637         page = (char *) get_zeroed_page(GFP_ATOMIC);
4638         if (page == NULL) {
4639                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4640                               "No memory to dump sense data\n");
4641                 return;
4642         }
4643         /* dump the sense data */
4644         len = sprintf(page, PRINTK_HEADER
4645                       " I/O status report for device %s:\n",
4646                       dev_name(&device->cdev->dev));
4647         len += sprintf(page + len, PRINTK_HEADER
4648                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4649                        "CS:%02X RC:%d\n",
4650                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4651                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4652                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4653                        req ? req->intrc : 0);
4654         len += sprintf(page + len, PRINTK_HEADER
4655                        " device %s: Failing CCW: %p\n",
4656                        dev_name(&device->cdev->dev),
4657                        (void *) (addr_t) irb->scsw.cmd.cpa);
4658         if (irb->esw.esw0.erw.cons) {
4659                 for (sl = 0; sl < 4; sl++) {
4660                         len += sprintf(page + len, PRINTK_HEADER
4661                                        " Sense(hex) %2d-%2d:",
4662                                        (8 * sl), ((8 * sl) + 7));
4663
4664                         for (sct = 0; sct < 8; sct++) {
4665                                 len += sprintf(page + len, " %02x",
4666                                                irb->ecw[8 * sl + sct]);
4667                         }
4668                         len += sprintf(page + len, "\n");
4669                 }
4670
4671                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
4672                         /* 24 Byte Sense Data */
4673                         sprintf(page + len, PRINTK_HEADER
4674                                 " 24 Byte: %x MSG %x, "
4675                                 "%s MSGb to SYSOP\n",
4676                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
4677                                 irb->ecw[1] & 0x10 ? "" : "no");
4678                 } else {
4679                         /* 32 Byte Sense Data */
4680                         sprintf(page + len, PRINTK_HEADER
4681                                 " 32 Byte: Format: %x "
4682                                 "Exception class %x\n",
4683                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
4684                 }
4685         } else {
4686                 sprintf(page + len, PRINTK_HEADER
4687                         " SORRY - NO VALID SENSE AVAILABLE\n");
4688         }
4689         printk(KERN_ERR "%s", page);
4690
4691         if (req) {
4692                 /* req == NULL for unsolicited interrupts */
4693                 /* dump the Channel Program (max 140 Bytes per line) */
4694                 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
4695                 first = req->cpaddr;
4696                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
4697                 to = min(first + 6, last);
4698                 len = sprintf(page, PRINTK_HEADER
4699                               " Related CP in req: %p\n", req);
4700                 dasd_eckd_dump_ccw_range(first, to, page + len);
4701                 printk(KERN_ERR "%s", page);
4702
4703                 /* print failing CCW area (maximum 4) */
4704                 /* scsw->cda is either valid or zero  */
4705                 len = 0;
4706                 from = ++to;
4707                 fail = (struct ccw1 *)(addr_t)
4708                                 irb->scsw.cmd.cpa; /* failing CCW */
4709                 if (from <  fail - 2) {
4710                         from = fail - 2;     /* there is a gap - print header */
4711                         len += sprintf(page, PRINTK_HEADER "......\n");
4712                 }
4713                 to = min(fail + 1, last);
4714                 len += dasd_eckd_dump_ccw_range(from, to, page + len);
4715
4716                 /* print last CCWs (maximum 2) */
4717                 from = max(from, ++to);
4718                 if (from < last - 1) {
4719                         from = last - 1;     /* there is a gap - print header */
4720                         len += sprintf(page + len, PRINTK_HEADER "......\n");
4721                 }
4722                 len += dasd_eckd_dump_ccw_range(from, last, page + len);
4723                 if (len > 0)
4724                         printk(KERN_ERR "%s", page);
4725         }
4726         free_page((unsigned long) page);
4727 }
4728
4729
4730 /*
4731  * Print sense data from a tcw.
4732  */
4733 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
4734                                  struct dasd_ccw_req *req, struct irb *irb)
4735 {
4736         char *page;
4737         int len, sl, sct, residual;
4738         struct tsb *tsb;
4739         u8 *sense, *rcq;
4740
4741         page = (char *) get_zeroed_page(GFP_ATOMIC);
4742         if (page == NULL) {
4743                 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
4744                             "No memory to dump sense data");
4745                 return;
4746         }
4747         /* dump the sense data */
4748         len = sprintf(page, PRINTK_HEADER
4749                       " I/O status report for device %s:\n",
4750                       dev_name(&device->cdev->dev));
4751         len += sprintf(page + len, PRINTK_HEADER
4752                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4753                        "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
4754                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4755                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4756                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4757                        irb->scsw.tm.fcxs,
4758                        (irb->scsw.tm.ifob << 7) | irb->scsw.tm.sesq,
4759                        req ? req->intrc : 0);
4760         len += sprintf(page + len, PRINTK_HEADER
4761                        " device %s: Failing TCW: %p\n",
4762                        dev_name(&device->cdev->dev),
4763                        (void *) (addr_t) irb->scsw.tm.tcw);
4764
4765         tsb = NULL;
4766         sense = NULL;
4767         if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
4768                 tsb = tcw_get_tsb(
4769                         (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
4770
4771         if (tsb) {
4772                 len += sprintf(page + len, PRINTK_HEADER
4773                                " tsb->length %d\n", tsb->length);
4774                 len += sprintf(page + len, PRINTK_HEADER
4775                                " tsb->flags %x\n", tsb->flags);
4776                 len += sprintf(page + len, PRINTK_HEADER
4777                                " tsb->dcw_offset %d\n", tsb->dcw_offset);
4778                 len += sprintf(page + len, PRINTK_HEADER
4779                                " tsb->count %d\n", tsb->count);
4780                 residual = tsb->count - 28;
4781                 len += sprintf(page + len, PRINTK_HEADER
4782                                " residual %d\n", residual);
4783
4784                 switch (tsb->flags & 0x07) {
4785                 case 1: /* tsa_iostat */
4786                         len += sprintf(page + len, PRINTK_HEADER
4787                                " tsb->tsa.iostat.dev_time %d\n",
4788                                        tsb->tsa.iostat.dev_time);
4789                         len += sprintf(page + len, PRINTK_HEADER
4790                                " tsb->tsa.iostat.def_time %d\n",
4791                                        tsb->tsa.iostat.def_time);
4792                         len += sprintf(page + len, PRINTK_HEADER
4793                                " tsb->tsa.iostat.queue_time %d\n",
4794                                        tsb->tsa.iostat.queue_time);
4795                         len += sprintf(page + len, PRINTK_HEADER
4796                                " tsb->tsa.iostat.dev_busy_time %d\n",
4797                                        tsb->tsa.iostat.dev_busy_time);
4798                         len += sprintf(page + len, PRINTK_HEADER
4799                                " tsb->tsa.iostat.dev_act_time %d\n",
4800                                        tsb->tsa.iostat.dev_act_time);
4801                         sense = tsb->tsa.iostat.sense;
4802                         break;
4803                 case 2: /* ts_ddpc */
4804                         len += sprintf(page + len, PRINTK_HEADER
4805                                " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
4806                         for (sl = 0; sl < 2; sl++) {
4807                                 len += sprintf(page + len, PRINTK_HEADER
4808                                                " tsb->tsa.ddpc.rcq %2d-%2d: ",
4809                                                (8 * sl), ((8 * sl) + 7));
4810                                 rcq = tsb->tsa.ddpc.rcq;
4811                                 for (sct = 0; sct < 8; sct++) {
4812                                         len += sprintf(page + len, " %02x",
4813                                                        rcq[8 * sl + sct]);
4814                                 }
4815                                 len += sprintf(page + len, "\n");
4816                         }
4817                         sense = tsb->tsa.ddpc.sense;
4818                         break;
4819                 case 3: /* tsa_intrg */
4820                         len += sprintf(page + len, PRINTK_HEADER
4821                                       " tsb->tsa.intrg.: not supported yet\n");
4822                         break;
4823                 }
4824
4825                 if (sense) {
4826                         for (sl = 0; sl < 4; sl++) {
4827                                 len += sprintf(page + len, PRINTK_HEADER
4828                                                " Sense(hex) %2d-%2d:",
4829                                                (8 * sl), ((8 * sl) + 7));
4830                                 for (sct = 0; sct < 8; sct++) {
4831                                         len += sprintf(page + len, " %02x",
4832                                                        sense[8 * sl + sct]);
4833                                 }
4834                                 len += sprintf(page + len, "\n");
4835                         }
4836
4837                         if (sense[27] & DASD_SENSE_BIT_0) {
4838                                 /* 24 Byte Sense Data */
4839                                 sprintf(page + len, PRINTK_HEADER
4840                                         " 24 Byte: %x MSG %x, "
4841                                         "%s MSGb to SYSOP\n",
4842                                         sense[7] >> 4, sense[7] & 0x0f,
4843                                         sense[1] & 0x10 ? "" : "no");
4844                         } else {
4845                                 /* 32 Byte Sense Data */
4846                                 sprintf(page + len, PRINTK_HEADER
4847                                         " 32 Byte: Format: %x "
4848                                         "Exception class %x\n",
4849                                         sense[6] & 0x0f, sense[22] >> 4);
4850                         }
4851                 } else {
4852                         sprintf(page + len, PRINTK_HEADER
4853                                 " SORRY - NO VALID SENSE AVAILABLE\n");
4854                 }
4855         } else {
4856                 sprintf(page + len, PRINTK_HEADER
4857                         " SORRY - NO TSB DATA AVAILABLE\n");
4858         }
4859         printk(KERN_ERR "%s", page);
4860         free_page((unsigned long) page);
4861 }
4862
4863 static void dasd_eckd_dump_sense(struct dasd_device *device,
4864                                  struct dasd_ccw_req *req, struct irb *irb)
4865 {
4866         u8 *sense = dasd_get_sense(irb);
4867
4868         if (scsw_is_tm(&irb->scsw)) {
4869                 /*
4870                  * In some cases the 'File Protected' or 'Incorrect Length'
4871                  * error might be expected and log messages shouldn't be written
4872                  * then. Check if the according suppress bit is set.
4873                  */
4874                 if (sense && (sense[1] & SNS1_FILE_PROTECTED) &&
4875                     test_bit(DASD_CQR_SUPPRESS_FP, &req->flags))
4876                         return;
4877                 if (scsw_cstat(&irb->scsw) == 0x40 &&
4878                     test_bit(DASD_CQR_SUPPRESS_IL, &req->flags))
4879                         return;
4880
4881                 dasd_eckd_dump_sense_tcw(device, req, irb);
4882         } else {
4883                 /*
4884                  * In some cases the 'Command Reject' or 'No Record Found'
4885                  * error might be expected and log messages shouldn't be
4886                  * written then. Check if the according suppress bit is set.
4887                  */
4888                 if (sense && sense[0] & SNS0_CMD_REJECT &&
4889                     test_bit(DASD_CQR_SUPPRESS_CR, &req->flags))
4890                         return;
4891
4892                 if (sense && sense[1] & SNS1_NO_REC_FOUND &&
4893                     test_bit(DASD_CQR_SUPPRESS_NRF, &req->flags))
4894                         return;
4895
4896                 dasd_eckd_dump_sense_ccw(device, req, irb);
4897         }
4898 }
4899
4900 static int dasd_eckd_pm_freeze(struct dasd_device *device)
4901 {
4902         /*
4903          * the device should be disconnected from our LCU structure
4904          * on restore we will reconnect it and reread LCU specific
4905          * information like PAV support that might have changed
4906          */
4907         dasd_alias_remove_device(device);
4908         dasd_alias_disconnect_device_from_lcu(device);
4909
4910         return 0;
4911 }
4912
4913 static int dasd_eckd_restore_device(struct dasd_device *device)
4914 {
4915         struct dasd_eckd_private *private = device->private;
4916         struct dasd_eckd_characteristics temp_rdc_data;
4917         int rc;
4918         struct dasd_uid temp_uid;
4919         unsigned long flags;
4920         unsigned long cqr_flags = 0;
4921
4922         /* Read Configuration Data */
4923         rc = dasd_eckd_read_conf(device);
4924         if (rc) {
4925                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4926                                 "Read configuration data failed, rc=%d", rc);
4927                 goto out_err;
4928         }
4929
4930         dasd_eckd_get_uid(device, &temp_uid);
4931         /* Generate device unique id */
4932         rc = dasd_eckd_generate_uid(device);
4933         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4934         if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
4935                 dev_err(&device->cdev->dev, "The UID of the DASD has "
4936                         "changed\n");
4937         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4938         if (rc)
4939                 goto out_err;
4940
4941         /* register lcu with alias handling, enable PAV if this is a new lcu */
4942         rc = dasd_alias_make_device_known_to_lcu(device);
4943         if (rc)
4944                 goto out_err;
4945
4946         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr_flags);
4947         dasd_eckd_validate_server(device, cqr_flags);
4948
4949         /* RE-Read Configuration Data */
4950         rc = dasd_eckd_read_conf(device);
4951         if (rc) {
4952                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4953                         "Read configuration data failed, rc=%d", rc);
4954                 goto out_err2;
4955         }
4956
4957         /* Read Feature Codes */
4958         dasd_eckd_read_features(device);
4959
4960         /* Read Device Characteristics */
4961         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
4962                                          &temp_rdc_data, 64);
4963         if (rc) {
4964                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4965                                 "Read device characteristic failed, rc=%d", rc);
4966                 goto out_err2;
4967         }
4968         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4969         memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
4970         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4971
4972         /* add device to alias management */
4973         dasd_alias_add_device(device);
4974
4975         return 0;
4976
4977 out_err2:
4978         dasd_alias_disconnect_device_from_lcu(device);
4979 out_err:
4980         return -1;
4981 }
4982
4983 static int dasd_eckd_reload_device(struct dasd_device *device)
4984 {
4985         struct dasd_eckd_private *private = device->private;
4986         int rc, old_base;
4987         char print_uid[60];
4988         struct dasd_uid uid;
4989         unsigned long flags;
4990
4991         /*
4992          * remove device from alias handling to prevent new requests
4993          * from being scheduled on the wrong alias device
4994          */
4995         dasd_alias_remove_device(device);
4996
4997         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4998         old_base = private->uid.base_unit_addr;
4999         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
5000
5001         /* Read Configuration Data */
5002         rc = dasd_eckd_read_conf(device);
5003         if (rc)
5004                 goto out_err;
5005
5006         rc = dasd_eckd_generate_uid(device);
5007         if (rc)
5008                 goto out_err;
5009         /*
5010          * update unit address configuration and
5011          * add device to alias management
5012          */
5013         dasd_alias_update_add_device(device);
5014
5015         dasd_eckd_get_uid(device, &uid);
5016
5017         if (old_base != uid.base_unit_addr) {
5018                 if (strlen(uid.vduit) > 0)
5019                         snprintf(print_uid, sizeof(print_uid),
5020                                  "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
5021                                  uid.ssid, uid.base_unit_addr, uid.vduit);
5022                 else
5023                         snprintf(print_uid, sizeof(print_uid),
5024                                  "%s.%s.%04x.%02x", uid.vendor, uid.serial,
5025                                  uid.ssid, uid.base_unit_addr);
5026
5027                 dev_info(&device->cdev->dev,
5028                          "An Alias device was reassigned to a new base device "
5029                          "with UID: %s\n", print_uid);
5030         }
5031         return 0;
5032
5033 out_err:
5034         return -1;
5035 }
5036
5037 static int dasd_eckd_read_message_buffer(struct dasd_device *device,
5038                                          struct dasd_rssd_messages *messages,
5039                                          __u8 lpum)
5040 {
5041         struct dasd_rssd_messages *message_buf;
5042         struct dasd_psf_prssd_data *prssdp;
5043         struct dasd_ccw_req *cqr;
5044         struct ccw1 *ccw;
5045         int rc;
5046
5047         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5048                                    (sizeof(struct dasd_psf_prssd_data) +
5049                                     sizeof(struct dasd_rssd_messages)),
5050                                    device, NULL);
5051         if (IS_ERR(cqr)) {
5052                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5053                                 "Could not allocate read message buffer request");
5054                 return PTR_ERR(cqr);
5055         }
5056
5057         cqr->lpm = lpum;
5058 retry:
5059         cqr->startdev = device;
5060         cqr->memdev = device;
5061         cqr->block = NULL;
5062         cqr->expires = 10 * HZ;
5063         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
5064         /* dasd_sleep_on_immediatly does not do complex error
5065          * recovery so clear erp flag and set retry counter to
5066          * do basic erp */
5067         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5068         cqr->retries = 256;
5069
5070         /* Prepare for Read Subsystem Data */
5071         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5072         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5073         prssdp->order = PSF_ORDER_PRSSD;
5074         prssdp->suborder = 0x03;        /* Message Buffer */
5075         /* all other bytes of prssdp must be zero */
5076
5077         ccw = cqr->cpaddr;
5078         ccw->cmd_code = DASD_ECKD_CCW_PSF;
5079         ccw->count = sizeof(struct dasd_psf_prssd_data);
5080         ccw->flags |= CCW_FLAG_CC;
5081         ccw->flags |= CCW_FLAG_SLI;
5082         ccw->cda = (__u32)(addr_t) prssdp;
5083
5084         /* Read Subsystem Data - message buffer */
5085         message_buf = (struct dasd_rssd_messages *) (prssdp + 1);
5086         memset(message_buf, 0, sizeof(struct dasd_rssd_messages));
5087
5088         ccw++;
5089         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5090         ccw->count = sizeof(struct dasd_rssd_messages);
5091         ccw->flags |= CCW_FLAG_SLI;
5092         ccw->cda = (__u32)(addr_t) message_buf;
5093
5094         cqr->buildclk = get_tod_clock();
5095         cqr->status = DASD_CQR_FILLED;
5096         rc = dasd_sleep_on_immediatly(cqr);
5097         if (rc == 0) {
5098                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5099                 message_buf = (struct dasd_rssd_messages *)
5100                         (prssdp + 1);
5101                 memcpy(messages, message_buf,
5102                        sizeof(struct dasd_rssd_messages));
5103         } else if (cqr->lpm) {
5104                 /*
5105                  * on z/VM we might not be able to do I/O on the requested path
5106                  * but instead we get the required information on any path
5107                  * so retry with open path mask
5108                  */
5109                 cqr->lpm = 0;
5110                 goto retry;
5111         } else
5112                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5113                                 "Reading messages failed with rc=%d\n"
5114                                 , rc);
5115         dasd_sfree_request(cqr, cqr->memdev);
5116         return rc;
5117 }
5118
5119 static int dasd_eckd_query_host_access(struct dasd_device *device,
5120                                        struct dasd_psf_query_host_access *data)
5121 {
5122         struct dasd_eckd_private *private = device->private;
5123         struct dasd_psf_query_host_access *host_access;
5124         struct dasd_psf_prssd_data *prssdp;
5125         struct dasd_ccw_req *cqr;
5126         struct ccw1 *ccw;
5127         int rc;
5128
5129         /* not available for HYPER PAV alias devices */
5130         if (!device->block && private->lcu->pav == HYPER_PAV)
5131                 return -EOPNOTSUPP;
5132
5133         /* may not be supported by the storage server */
5134         if (!(private->features.feature[14] & 0x80))
5135                 return -EOPNOTSUPP;
5136
5137         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5138                                    sizeof(struct dasd_psf_prssd_data) + 1,
5139                                    device, NULL);
5140         if (IS_ERR(cqr)) {
5141                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5142                                 "Could not allocate read message buffer request");
5143                 return PTR_ERR(cqr);
5144         }
5145         host_access = kzalloc(sizeof(*host_access), GFP_KERNEL | GFP_DMA);
5146         if (!host_access) {
5147                 dasd_sfree_request(cqr, device);
5148                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5149                                 "Could not allocate host_access buffer");
5150                 return -ENOMEM;
5151         }
5152         cqr->startdev = device;
5153         cqr->memdev = device;
5154         cqr->block = NULL;
5155         cqr->retries = 256;
5156         cqr->expires = 10 * HZ;
5157
5158         /* Prepare for Read Subsystem Data */
5159         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5160         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5161         prssdp->order = PSF_ORDER_PRSSD;
5162         prssdp->suborder = PSF_SUBORDER_QHA;    /* query host access */
5163         /* LSS and Volume that will be queried */
5164         prssdp->lss = private->ned->ID;
5165         prssdp->volume = private->ned->unit_addr;
5166         /* all other bytes of prssdp must be zero */
5167
5168         ccw = cqr->cpaddr;
5169         ccw->cmd_code = DASD_ECKD_CCW_PSF;
5170         ccw->count = sizeof(struct dasd_psf_prssd_data);
5171         ccw->flags |= CCW_FLAG_CC;
5172         ccw->flags |= CCW_FLAG_SLI;
5173         ccw->cda = (__u32)(addr_t) prssdp;
5174
5175         /* Read Subsystem Data - query host access */
5176         ccw++;
5177         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5178         ccw->count = sizeof(struct dasd_psf_query_host_access);
5179         ccw->flags |= CCW_FLAG_SLI;
5180         ccw->cda = (__u32)(addr_t) host_access;
5181
5182         cqr->buildclk = get_tod_clock();
5183         cqr->status = DASD_CQR_FILLED;
5184         /* the command might not be supported, suppress error message */
5185         __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
5186         rc = dasd_sleep_on_interruptible(cqr);
5187         if (rc == 0) {
5188                 *data = *host_access;
5189         } else {
5190                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5191                                 "Reading host access data failed with rc=%d\n",
5192                                 rc);
5193                 rc = -EOPNOTSUPP;
5194         }
5195
5196         dasd_sfree_request(cqr, cqr->memdev);
5197         kfree(host_access);
5198         return rc;
5199 }
5200 /*
5201  * return number of grouped devices
5202  */
5203 static int dasd_eckd_host_access_count(struct dasd_device *device)
5204 {
5205         struct dasd_psf_query_host_access *access;
5206         struct dasd_ckd_path_group_entry *entry;
5207         struct dasd_ckd_host_information *info;
5208         int count = 0;
5209         int rc, i;
5210
5211         access = kzalloc(sizeof(*access), GFP_NOIO);
5212         if (!access) {
5213                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5214                                 "Could not allocate access buffer");
5215                 return -ENOMEM;
5216         }
5217         rc = dasd_eckd_query_host_access(device, access);
5218         if (rc) {
5219                 kfree(access);
5220                 return rc;
5221         }
5222
5223         info = (struct dasd_ckd_host_information *)
5224                 access->host_access_information;
5225         for (i = 0; i < info->entry_count; i++) {
5226                 entry = (struct dasd_ckd_path_group_entry *)
5227                         (info->entry + i * info->entry_size);
5228                 if (entry->status_flags & DASD_ECKD_PG_GROUPED)
5229                         count++;
5230         }
5231
5232         kfree(access);
5233         return count;
5234 }
5235
5236 /*
5237  * write host access information to a sequential file
5238  */
5239 static int dasd_hosts_print(struct dasd_device *device, struct seq_file *m)
5240 {
5241         struct dasd_psf_query_host_access *access;
5242         struct dasd_ckd_path_group_entry *entry;
5243         struct dasd_ckd_host_information *info;
5244         char sysplex[9] = "";
5245         int rc, i;
5246
5247         access = kzalloc(sizeof(*access), GFP_NOIO);
5248         if (!access) {
5249                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5250                                 "Could not allocate access buffer");
5251                 return -ENOMEM;
5252         }
5253         rc = dasd_eckd_query_host_access(device, access);
5254         if (rc) {
5255                 kfree(access);
5256                 return rc;
5257         }
5258
5259         info = (struct dasd_ckd_host_information *)
5260                 access->host_access_information;
5261         for (i = 0; i < info->entry_count; i++) {
5262                 entry = (struct dasd_ckd_path_group_entry *)
5263                         (info->entry + i * info->entry_size);
5264                 /* PGID */
5265                 seq_printf(m, "pgid %*phN\n", 11, entry->pgid);
5266                 /* FLAGS */
5267                 seq_printf(m, "status_flags %02x\n", entry->status_flags);
5268                 /* SYSPLEX NAME */
5269                 memcpy(&sysplex, &entry->sysplex_name, sizeof(sysplex) - 1);
5270                 EBCASC(sysplex, sizeof(sysplex));
5271                 seq_printf(m, "sysplex_name %8s\n", sysplex);
5272                 /* SUPPORTED CYLINDER */
5273                 seq_printf(m, "supported_cylinder %d\n", entry->cylinder);
5274                 /* TIMESTAMP */
5275                 seq_printf(m, "timestamp %lu\n", (unsigned long)
5276                            entry->timestamp);
5277         }
5278         kfree(access);
5279
5280         return 0;
5281 }
5282
5283 /*
5284  * Perform Subsystem Function - CUIR response
5285  */
5286 static int
5287 dasd_eckd_psf_cuir_response(struct dasd_device *device, int response,
5288                             __u32 message_id, __u8 lpum)
5289 {
5290         struct dasd_psf_cuir_response *psf_cuir;
5291         int pos = pathmask_to_pos(lpum);
5292         struct dasd_ccw_req *cqr;
5293         struct ccw1 *ccw;
5294         int rc;
5295
5296         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
5297                                    sizeof(struct dasd_psf_cuir_response),
5298                                    device, NULL);
5299
5300         if (IS_ERR(cqr)) {
5301                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5302                            "Could not allocate PSF-CUIR request");
5303                 return PTR_ERR(cqr);
5304         }
5305
5306         psf_cuir = (struct dasd_psf_cuir_response *)cqr->data;
5307         psf_cuir->order = PSF_ORDER_CUIR_RESPONSE;
5308         psf_cuir->cc = response;
5309         psf_cuir->chpid = device->path[pos].chpid;
5310         psf_cuir->message_id = message_id;
5311         psf_cuir->cssid = device->path[pos].cssid;
5312         psf_cuir->ssid = device->path[pos].ssid;
5313         ccw = cqr->cpaddr;
5314         ccw->cmd_code = DASD_ECKD_CCW_PSF;
5315         ccw->cda = (__u32)(addr_t)psf_cuir;
5316         ccw->flags = CCW_FLAG_SLI;
5317         ccw->count = sizeof(struct dasd_psf_cuir_response);
5318
5319         cqr->startdev = device;
5320         cqr->memdev = device;
5321         cqr->block = NULL;
5322         cqr->retries = 256;
5323         cqr->expires = 10*HZ;
5324         cqr->buildclk = get_tod_clock();
5325         cqr->status = DASD_CQR_FILLED;
5326         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
5327
5328         rc = dasd_sleep_on(cqr);
5329
5330         dasd_sfree_request(cqr, cqr->memdev);
5331         return rc;
5332 }
5333
5334 /*
5335  * return configuration data that is referenced by record selector
5336  * if a record selector is specified or per default return the
5337  * conf_data pointer for the path specified by lpum
5338  */
5339 static struct dasd_conf_data *dasd_eckd_get_ref_conf(struct dasd_device *device,
5340                                                      __u8 lpum,
5341                                                      struct dasd_cuir_message *cuir)
5342 {
5343         struct dasd_conf_data *conf_data;
5344         int path, pos;
5345
5346         if (cuir->record_selector == 0)
5347                 goto out;
5348         for (path = 0x80, pos = 0; path; path >>= 1, pos++) {
5349                 conf_data = device->path[pos].conf_data;
5350                 if (conf_data->gneq.record_selector ==
5351                     cuir->record_selector)
5352                         return conf_data;
5353         }
5354 out:
5355         return device->path[pathmask_to_pos(lpum)].conf_data;
5356 }
5357
5358 /*
5359  * This function determines the scope of a reconfiguration request by
5360  * analysing the path and device selection data provided in the CUIR request.
5361  * Returns a path mask containing CUIR affected paths for the give device.
5362  *
5363  * If the CUIR request does not contain the required information return the
5364  * path mask of the path the attention message for the CUIR request was reveived
5365  * on.
5366  */
5367 static int dasd_eckd_cuir_scope(struct dasd_device *device, __u8 lpum,
5368                                 struct dasd_cuir_message *cuir)
5369 {
5370         struct dasd_conf_data *ref_conf_data;
5371         unsigned long bitmask = 0, mask = 0;
5372         struct dasd_conf_data *conf_data;
5373         unsigned int pos, path;
5374         char *ref_gneq, *gneq;
5375         char *ref_ned, *ned;
5376         int tbcpm = 0;
5377
5378         /* if CUIR request does not specify the scope use the path
5379            the attention message was presented on */
5380         if (!cuir->ned_map ||
5381             !(cuir->neq_map[0] | cuir->neq_map[1] | cuir->neq_map[2]))
5382                 return lpum;
5383
5384         /* get reference conf data */
5385         ref_conf_data = dasd_eckd_get_ref_conf(device, lpum, cuir);
5386         /* reference ned is determined by ned_map field */
5387         pos = 8 - ffs(cuir->ned_map);
5388         ref_ned = (char *)&ref_conf_data->neds[pos];
5389         ref_gneq = (char *)&ref_conf_data->gneq;
5390         /* transfer 24 bit neq_map to mask */
5391         mask = cuir->neq_map[2];
5392         mask |= cuir->neq_map[1] << 8;
5393         mask |= cuir->neq_map[0] << 16;
5394
5395         for (path = 0; path < 8; path++) {
5396                 /* initialise data per path */
5397                 bitmask = mask;
5398                 conf_data = device->path[path].conf_data;
5399                 pos = 8 - ffs(cuir->ned_map);
5400                 ned = (char *) &conf_data->neds[pos];
5401                 /* compare reference ned and per path ned */
5402                 if (memcmp(ref_ned, ned, sizeof(*ned)) != 0)
5403                         continue;
5404                 gneq = (char *)&conf_data->gneq;
5405                 /* compare reference gneq and per_path gneq under
5406                    24 bit mask where mask bit 0 equals byte 7 of
5407                    the gneq and mask bit 24 equals byte 31 */
5408                 while (bitmask) {
5409                         pos = ffs(bitmask) - 1;
5410                         if (memcmp(&ref_gneq[31 - pos], &gneq[31 - pos], 1)
5411                             != 0)
5412                                 break;
5413                         clear_bit(pos, &bitmask);
5414                 }
5415                 if (bitmask)
5416                         continue;
5417                 /* device and path match the reference values
5418                    add path to CUIR scope */
5419                 tbcpm |= 0x80 >> path;
5420         }
5421         return tbcpm;
5422 }
5423
5424 static void dasd_eckd_cuir_notify_user(struct dasd_device *device,
5425                                        unsigned long paths, int action)
5426 {
5427         int pos;
5428
5429         while (paths) {
5430                 /* get position of bit in mask */
5431                 pos = 8 - ffs(paths);
5432                 /* get channel path descriptor from this position */
5433                 if (action == CUIR_QUIESCE)
5434                         pr_warn("Service on the storage server caused path %x.%02x to go offline",
5435                                 device->path[pos].cssid,
5436                                 device->path[pos].chpid);
5437                 else if (action == CUIR_RESUME)
5438                         pr_info("Path %x.%02x is back online after service on the storage server",
5439                                 device->path[pos].cssid,
5440                                 device->path[pos].chpid);
5441                 clear_bit(7 - pos, &paths);
5442         }
5443 }
5444
5445 static int dasd_eckd_cuir_remove_path(struct dasd_device *device, __u8 lpum,
5446                                       struct dasd_cuir_message *cuir)
5447 {
5448         unsigned long tbcpm;
5449
5450         tbcpm = dasd_eckd_cuir_scope(device, lpum, cuir);
5451         /* nothing to do if path is not in use */
5452         if (!(dasd_path_get_opm(device) & tbcpm))
5453                 return 0;
5454         if (!(dasd_path_get_opm(device) & ~tbcpm)) {
5455                 /* no path would be left if the CUIR action is taken
5456                    return error */
5457                 return -EINVAL;
5458         }
5459         /* remove device from operational path mask */
5460         dasd_path_remove_opm(device, tbcpm);
5461         dasd_path_add_cuirpm(device, tbcpm);
5462         return tbcpm;
5463 }
5464
5465 /*
5466  * walk through all devices and build a path mask to quiesce them
5467  * return an error if the last path to a device would be removed
5468  *
5469  * if only part of the devices are quiesced and an error
5470  * occurs no onlining necessary, the storage server will
5471  * notify the already set offline devices again
5472  */
5473 static int dasd_eckd_cuir_quiesce(struct dasd_device *device, __u8 lpum,
5474                                   struct dasd_cuir_message *cuir)
5475 {
5476         struct dasd_eckd_private *private = device->private;
5477         struct alias_pav_group *pavgroup, *tempgroup;
5478         struct dasd_device *dev, *n;
5479         unsigned long paths = 0;
5480         unsigned long flags;
5481         int tbcpm;
5482
5483         /* active devices */
5484         list_for_each_entry_safe(dev, n, &private->lcu->active_devices,
5485                                  alias_list) {
5486                 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
5487                 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
5488                 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
5489                 if (tbcpm < 0)
5490                         goto out_err;
5491                 paths |= tbcpm;
5492         }
5493         /* inactive devices */
5494         list_for_each_entry_safe(dev, n, &private->lcu->inactive_devices,
5495                                  alias_list) {
5496                 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
5497                 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
5498                 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
5499                 if (tbcpm < 0)
5500                         goto out_err;
5501                 paths |= tbcpm;
5502         }
5503         /* devices in PAV groups */
5504         list_for_each_entry_safe(pavgroup, tempgroup,
5505                                  &private->lcu->grouplist, group) {
5506                 list_for_each_entry_safe(dev, n, &pavgroup->baselist,
5507                                          alias_list) {
5508                         spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
5509                         tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
5510                         spin_unlock_irqrestore(
5511                                 get_ccwdev_lock(dev->cdev), flags);
5512                         if (tbcpm < 0)
5513                                 goto out_err;
5514                         paths |= tbcpm;
5515                 }
5516                 list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
5517                                          alias_list) {
5518                         spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
5519                         tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
5520                         spin_unlock_irqrestore(
5521                                 get_ccwdev_lock(dev->cdev), flags);
5522                         if (tbcpm < 0)
5523                                 goto out_err;
5524                         paths |= tbcpm;
5525                 }
5526         }
5527         /* notify user about all paths affected by CUIR action */
5528         dasd_eckd_cuir_notify_user(device, paths, CUIR_QUIESCE);
5529         return 0;
5530 out_err:
5531         return tbcpm;
5532 }
5533
5534 static int dasd_eckd_cuir_resume(struct dasd_device *device, __u8 lpum,
5535                                  struct dasd_cuir_message *cuir)
5536 {
5537         struct dasd_eckd_private *private = device->private;
5538         struct alias_pav_group *pavgroup, *tempgroup;
5539         struct dasd_device *dev, *n;
5540         unsigned long paths = 0;
5541         int tbcpm;
5542
5543         /*
5544          * the path may have been added through a generic path event before
5545          * only trigger path verification if the path is not already in use
5546          */
5547         list_for_each_entry_safe(dev, n,
5548                                  &private->lcu->active_devices,
5549                                  alias_list) {
5550                 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
5551                 paths |= tbcpm;
5552                 if (!(dasd_path_get_opm(dev) & tbcpm)) {
5553                         dasd_path_add_tbvpm(dev, tbcpm);
5554                         dasd_schedule_device_bh(dev);
5555                 }
5556         }
5557         list_for_each_entry_safe(dev, n,
5558                                  &private->lcu->inactive_devices,
5559                                  alias_list) {
5560                 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
5561                 paths |= tbcpm;
5562                 if (!(dasd_path_get_opm(dev) & tbcpm)) {
5563                         dasd_path_add_tbvpm(dev, tbcpm);
5564                         dasd_schedule_device_bh(dev);
5565                 }
5566         }
5567         /* devices in PAV groups */
5568         list_for_each_entry_safe(pavgroup, tempgroup,
5569                                  &private->lcu->grouplist,
5570                                  group) {
5571                 list_for_each_entry_safe(dev, n,
5572                                          &pavgroup->baselist,
5573                                          alias_list) {
5574                         tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
5575                         paths |= tbcpm;
5576                         if (!(dasd_path_get_opm(dev) & tbcpm)) {
5577                                 dasd_path_add_tbvpm(dev, tbcpm);
5578                                 dasd_schedule_device_bh(dev);
5579                         }
5580                 }
5581                 list_for_each_entry_safe(dev, n,
5582                                          &pavgroup->aliaslist,
5583                                          alias_list) {
5584                         tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
5585                         paths |= tbcpm;
5586                         if (!(dasd_path_get_opm(dev) & tbcpm)) {
5587                                 dasd_path_add_tbvpm(dev, tbcpm);
5588                                 dasd_schedule_device_bh(dev);
5589                         }
5590                 }
5591         }
5592         /* notify user about all paths affected by CUIR action */
5593         dasd_eckd_cuir_notify_user(device, paths, CUIR_RESUME);
5594         return 0;
5595 }
5596
5597 static void dasd_eckd_handle_cuir(struct dasd_device *device, void *messages,
5598                                  __u8 lpum)
5599 {
5600         struct dasd_cuir_message *cuir = messages;
5601         int response;
5602
5603         DBF_DEV_EVENT(DBF_WARNING, device,
5604                       "CUIR request: %016llx %016llx %016llx %08x",
5605                       ((u64 *)cuir)[0], ((u64 *)cuir)[1], ((u64 *)cuir)[2],
5606                       ((u32 *)cuir)[3]);
5607
5608         if (cuir->code == CUIR_QUIESCE) {
5609                 /* quiesce */
5610                 if (dasd_eckd_cuir_quiesce(device, lpum, cuir))
5611                         response = PSF_CUIR_LAST_PATH;
5612                 else
5613                         response = PSF_CUIR_COMPLETED;
5614         } else if (cuir->code == CUIR_RESUME) {
5615                 /* resume */
5616                 dasd_eckd_cuir_resume(device, lpum, cuir);
5617                 response = PSF_CUIR_COMPLETED;
5618         } else
5619                 response = PSF_CUIR_NOT_SUPPORTED;
5620
5621         dasd_eckd_psf_cuir_response(device, response,
5622                                     cuir->message_id, lpum);
5623         DBF_DEV_EVENT(DBF_WARNING, device,
5624                       "CUIR response: %d on message ID %08x", response,
5625                       cuir->message_id);
5626         /* to make sure there is no attention left schedule work again */
5627         device->discipline->check_attention(device, lpum);
5628 }
5629
5630 static void dasd_eckd_check_attention_work(struct work_struct *work)
5631 {
5632         struct check_attention_work_data *data;
5633         struct dasd_rssd_messages *messages;
5634         struct dasd_device *device;
5635         int rc;
5636
5637         data = container_of(work, struct check_attention_work_data, worker);
5638         device = data->device;
5639         messages = kzalloc(sizeof(*messages), GFP_KERNEL);
5640         if (!messages) {
5641                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5642                               "Could not allocate attention message buffer");
5643                 goto out;
5644         }
5645         rc = dasd_eckd_read_message_buffer(device, messages, data->lpum);
5646         if (rc)
5647                 goto out;
5648         if (messages->length == ATTENTION_LENGTH_CUIR &&
5649             messages->format == ATTENTION_FORMAT_CUIR)
5650                 dasd_eckd_handle_cuir(device, messages, data->lpum);
5651 out:
5652         dasd_put_device(device);
5653         kfree(messages);
5654         kfree(data);
5655 }
5656
5657 static int dasd_eckd_check_attention(struct dasd_device *device, __u8 lpum)
5658 {
5659         struct check_attention_work_data *data;
5660
5661         data = kzalloc(sizeof(*data), GFP_ATOMIC);
5662         if (!data)
5663                 return -ENOMEM;
5664         INIT_WORK(&data->worker, dasd_eckd_check_attention_work);
5665         dasd_get_device(device);
5666         data->device = device;
5667         data->lpum = lpum;
5668         schedule_work(&data->worker);
5669         return 0;
5670 }
5671
5672 static int dasd_eckd_disable_hpf_path(struct dasd_device *device, __u8 lpum)
5673 {
5674         if (~lpum & dasd_path_get_opm(device)) {
5675                 dasd_path_add_nohpfpm(device, lpum);
5676                 dasd_path_remove_opm(device, lpum);
5677                 dev_err(&device->cdev->dev,
5678                         "Channel path %02X lost HPF functionality and is disabled\n",
5679                         lpum);
5680                 return 1;
5681         }
5682         return 0;
5683 }
5684
5685 static void dasd_eckd_disable_hpf_device(struct dasd_device *device)
5686 {
5687         struct dasd_eckd_private *private = device->private;
5688
5689         dev_err(&device->cdev->dev,
5690                 "High Performance FICON disabled\n");
5691         private->fcx_max_data = 0;
5692 }
5693
5694 static int dasd_eckd_hpf_enabled(struct dasd_device *device)
5695 {
5696         struct dasd_eckd_private *private = device->private;
5697
5698         return private->fcx_max_data ? 1 : 0;
5699 }
5700
5701 static void dasd_eckd_handle_hpf_error(struct dasd_device *device,
5702                                        struct irb *irb)
5703 {
5704         struct dasd_eckd_private *private = device->private;
5705
5706         if (!private->fcx_max_data) {
5707                 /* sanity check for no HPF, the error makes no sense */
5708                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5709                               "Trying to disable HPF for a non HPF device");
5710                 return;
5711         }
5712         if (irb->scsw.tm.sesq == SCSW_SESQ_DEV_NOFCX) {
5713                 dasd_eckd_disable_hpf_device(device);
5714         } else if (irb->scsw.tm.sesq == SCSW_SESQ_PATH_NOFCX) {
5715                 if (dasd_eckd_disable_hpf_path(device, irb->esw.esw1.lpum))
5716                         return;
5717                 dasd_eckd_disable_hpf_device(device);
5718                 dasd_path_set_tbvpm(device,
5719                                   dasd_path_get_hpfpm(device));
5720         }
5721         /*
5722          * prevent that any new I/O ist started on the device and schedule a
5723          * requeue of existing requests
5724          */
5725         dasd_device_set_stop_bits(device, DASD_STOPPED_NOT_ACC);
5726         dasd_schedule_requeue(device);
5727 }
5728
5729 static struct ccw_driver dasd_eckd_driver = {
5730         .driver = {
5731                 .name   = "dasd-eckd",
5732                 .owner  = THIS_MODULE,
5733         },
5734         .ids         = dasd_eckd_ids,
5735         .probe       = dasd_eckd_probe,
5736         .remove      = dasd_generic_remove,
5737         .set_offline = dasd_generic_set_offline,
5738         .set_online  = dasd_eckd_set_online,
5739         .notify      = dasd_generic_notify,
5740         .path_event  = dasd_generic_path_event,
5741         .shutdown    = dasd_generic_shutdown,
5742         .freeze      = dasd_generic_pm_freeze,
5743         .thaw        = dasd_generic_restore_device,
5744         .restore     = dasd_generic_restore_device,
5745         .uc_handler  = dasd_generic_uc_handler,
5746         .int_class   = IRQIO_DAS,
5747 };
5748
5749 /*
5750  * max_blocks is dependent on the amount of storage that is available
5751  * in the static io buffer for each device. Currently each device has
5752  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
5753  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
5754  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
5755  * addition we have one define extent ccw + 16 bytes of data and one
5756  * locate record ccw + 16 bytes of data. That makes:
5757  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
5758  * We want to fit two into the available memory so that we can immediately
5759  * start the next request if one finishes off. That makes 249.5 blocks
5760  * for one request. Give a little safety and the result is 240.
5761  */
5762 static struct dasd_discipline dasd_eckd_discipline = {
5763         .owner = THIS_MODULE,
5764         .name = "ECKD",
5765         .ebcname = "ECKD",
5766         .max_blocks = 190,
5767         .check_device = dasd_eckd_check_characteristics,
5768         .uncheck_device = dasd_eckd_uncheck_device,
5769         .do_analysis = dasd_eckd_do_analysis,
5770         .verify_path = dasd_eckd_verify_path,
5771         .basic_to_ready = dasd_eckd_basic_to_ready,
5772         .online_to_ready = dasd_eckd_online_to_ready,
5773         .basic_to_known = dasd_eckd_basic_to_known,
5774         .fill_geometry = dasd_eckd_fill_geometry,
5775         .start_IO = dasd_start_IO,
5776         .term_IO = dasd_term_IO,
5777         .handle_terminated_request = dasd_eckd_handle_terminated_request,
5778         .format_device = dasd_eckd_format_device,
5779         .check_device_format = dasd_eckd_check_device_format,
5780         .erp_action = dasd_eckd_erp_action,
5781         .erp_postaction = dasd_eckd_erp_postaction,
5782         .check_for_device_change = dasd_eckd_check_for_device_change,
5783         .build_cp = dasd_eckd_build_alias_cp,
5784         .free_cp = dasd_eckd_free_alias_cp,
5785         .dump_sense = dasd_eckd_dump_sense,
5786         .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
5787         .fill_info = dasd_eckd_fill_info,
5788         .ioctl = dasd_eckd_ioctl,
5789         .freeze = dasd_eckd_pm_freeze,
5790         .restore = dasd_eckd_restore_device,
5791         .reload = dasd_eckd_reload_device,
5792         .get_uid = dasd_eckd_get_uid,
5793         .kick_validate = dasd_eckd_kick_validate_server,
5794         .check_attention = dasd_eckd_check_attention,
5795         .host_access_count = dasd_eckd_host_access_count,
5796         .hosts_print = dasd_hosts_print,
5797         .handle_hpf_error = dasd_eckd_handle_hpf_error,
5798         .disable_hpf = dasd_eckd_disable_hpf_device,
5799         .hpf_enabled = dasd_eckd_hpf_enabled,
5800         .reset_path = dasd_eckd_reset_path,
5801 };
5802
5803 static int __init
5804 dasd_eckd_init(void)
5805 {
5806         int ret;
5807
5808         ASCEBC(dasd_eckd_discipline.ebcname, 4);
5809         dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
5810                                    GFP_KERNEL | GFP_DMA);
5811         if (!dasd_reserve_req)
5812                 return -ENOMEM;
5813         path_verification_worker = kmalloc(sizeof(*path_verification_worker),
5814                                    GFP_KERNEL | GFP_DMA);
5815         if (!path_verification_worker) {
5816                 kfree(dasd_reserve_req);
5817                 return -ENOMEM;
5818         }
5819         rawpadpage = (void *)__get_free_page(GFP_KERNEL);
5820         if (!rawpadpage) {
5821                 kfree(path_verification_worker);
5822                 kfree(dasd_reserve_req);
5823                 return -ENOMEM;
5824         }
5825         ret = ccw_driver_register(&dasd_eckd_driver);
5826         if (!ret)
5827                 wait_for_device_probe();
5828         else {
5829                 kfree(path_verification_worker);
5830                 kfree(dasd_reserve_req);
5831                 free_page((unsigned long)rawpadpage);
5832         }
5833         return ret;
5834 }
5835
5836 static void __exit
5837 dasd_eckd_cleanup(void)
5838 {
5839         ccw_driver_unregister(&dasd_eckd_driver);
5840         kfree(path_verification_worker);
5841         kfree(dasd_reserve_req);
5842         free_page((unsigned long)rawpadpage);
5843 }
5844
5845 module_init(dasd_eckd_init);
5846 module_exit(dasd_eckd_cleanup);