drivers/s390/block/dasd_eckd.c

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