drivers/s390/block/dasd_diag.c

   1 /*
   2  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   3  * Based on.......: linux/drivers/s390/block/mdisk.c
   4  * ...............: by Hartmunt Penner <hpenner@de.ibm.com>
   5  * Bugreports.to..: <Linux390@de.ibm.com>
   6  * Copyright IBM Corp. 1999, 2000
   7  *
   8  */
   9
  10 #define KMSG_COMPONENT "dasd"
  11
  12 #include <linux/kernel_stat.h>
  13 #include <linux/stddef.h>
  14 #include <linux/kernel.h>
  15 #include <linux/slab.h>
  16 #include <linux/hdreg.h>
  17 #include <linux/bio.h>
  18 #include <linux/module.h>
  19 #include <linux/init.h>
  20 #include <linux/jiffies.h>
  21
  22 #include <asm/dasd.h>
  23 #include <asm/debug.h>
  24 #include <asm/diag.h>
  25 #include <asm/ebcdic.h>
  26 #include <asm/io.h>
  27 #include <asm/irq.h>
  28 #include <asm/vtoc.h>
  29 #include <asm/diag.h>
  30
  31 #include "dasd_int.h"
  32 #include "dasd_diag.h"
  33
  34 #define PRINTK_HEADER "dasd(diag):"
  35
  36 MODULE_LICENSE("GPL");
  37
  38 /* The maximum number of blocks per request (max_blocks) is dependent on the
  39  * amount of storage that is available in the static I/O buffer for each
  40  * device. Currently each device gets 2 pages. We want to fit two requests
  41  * into the available memory so that we can immediately start the next if one
  42  * finishes. */
  43 #define DIAG_MAX_BLOCKS (((2 * PAGE_SIZE - sizeof(struct dasd_ccw_req) - \
  44                            sizeof(struct dasd_diag_req)) / \
  45                            sizeof(struct dasd_diag_bio)) / 2)
  46 #define DIAG_MAX_RETRIES        32
  47 #define DIAG_TIMEOUT            50
  48
  49 static struct dasd_discipline dasd_diag_discipline;
  50
  51 struct dasd_diag_private {
  52         struct dasd_diag_characteristics rdc_data;
  53         struct dasd_diag_rw_io iob;
  54         struct dasd_diag_init_io iib;
  55         blocknum_t pt_block;
  56         struct ccw_dev_id dev_id;
  57 };
  58
  59 struct dasd_diag_req {
  60         unsigned int block_count;
  61         struct dasd_diag_bio bio[0];
  62 };
  63
  64 static const u8 DASD_DIAG_CMS1[] = { 0xc3, 0xd4, 0xe2, 0xf1 };/* EBCDIC CMS1 */
  65
  66 /* Perform DIAG250 call with block I/O parameter list iob (input and output)
  67  * and function code cmd.
  68  * In case of an exception return 3. Otherwise return result of bitwise OR of
  69  * resulting condition code and DIAG return code. */
  70 static inline int __dia250(void *iob, int cmd)
  71 {
  72         register unsigned long reg2 asm ("2") = (unsigned long) iob;
  73         typedef union {
  74                 struct dasd_diag_init_io init_io;
  75                 struct dasd_diag_rw_io rw_io;
  76         } addr_type;
  77         int rc;
  78
  79         rc = 3;
  80         asm volatile(
  81                 "       diag    2,%2,0x250\n"
  82                 "0:     ipm     %0\n"
  83                 "       srl     %0,28\n"
  84                 "       or      %0,3\n"
  85                 "1:\n"
  86                 EX_TABLE(0b,1b)
  87                 : "+d" (rc), "=m" (*(addr_type *) iob)
  88                 : "d" (cmd), "d" (reg2), "m" (*(addr_type *) iob)
  89                 : "3", "cc");
  90         return rc;
  91 }
  92
  93 static inline int dia250(void *iob, int cmd)
  94 {
  95         diag_stat_inc(DIAG_STAT_X250);
  96         return __dia250(iob, cmd);
  97 }
  98
  99 /* Initialize block I/O to DIAG device using the specified blocksize and
 100  * block offset. On success, return zero and set end_block to contain the
 101  * number of blocks on the device minus the specified offset. Return non-zero
 102  * otherwise. */
 103 static inline int
 104 mdsk_init_io(struct dasd_device *device, unsigned int blocksize,
 105              blocknum_t offset, blocknum_t *end_block)
 106 {
 107         struct dasd_diag_private *private;
 108         struct dasd_diag_init_io *iib;
 109         int rc;
 110
 111         private = (struct dasd_diag_private *) device->private;
 112         iib = &private->iib;
 113         memset(iib, 0, sizeof (struct dasd_diag_init_io));
 114
 115         iib->dev_nr = private->dev_id.devno;
 116         iib->block_size = blocksize;
 117         iib->offset = offset;
 118         iib->flaga = DASD_DIAG_FLAGA_DEFAULT;
 119
 120         rc = dia250(iib, INIT_BIO);
 121
 122         if ((rc & 3) == 0 && end_block)
 123                 *end_block = iib->end_block;
 124
 125         return rc;
 126 }
 127
 128 /* Remove block I/O environment for device. Return zero on success, non-zero
 129  * otherwise. */
 130 static inline int
 131 mdsk_term_io(struct dasd_device * device)
 132 {
 133         struct dasd_diag_private *private;
 134         struct dasd_diag_init_io *iib;
 135         int rc;
 136
 137         private = (struct dasd_diag_private *) device->private;
 138         iib = &private->iib;
 139         memset(iib, 0, sizeof (struct dasd_diag_init_io));
 140         iib->dev_nr = private->dev_id.devno;
 141         rc = dia250(iib, TERM_BIO);
 142         return rc;
 143 }
 144
 145 /* Error recovery for failed DIAG requests - try to reestablish the DIAG
 146  * environment. */
 147 static void
 148 dasd_diag_erp(struct dasd_device *device)
 149 {
 150         int rc;
 151
 152         mdsk_term_io(device);
 153         rc = mdsk_init_io(device, device->block->bp_block, 0, NULL);
 154         if (rc == 4) {
 155                 if (!(test_and_set_bit(DASD_FLAG_DEVICE_RO, &device->flags)))
 156                         pr_warning("%s: The access mode of a DIAG device "
 157                                    "changed to read-only\n",
 158                                    dev_name(&device->cdev->dev));
 159                 rc = 0;
 160         }
 161         if (rc)
 162                 pr_warning("%s: DIAG ERP failed with "
 163                             "rc=%d\n", dev_name(&device->cdev->dev), rc);
 164 }
 165
 166 /* Start a given request at the device. Return zero on success, non-zero
 167  * otherwise. */
 168 static int
 169 dasd_start_diag(struct dasd_ccw_req * cqr)
 170 {
 171         struct dasd_device *device;
 172         struct dasd_diag_private *private;
 173         struct dasd_diag_req *dreq;
 174         int rc;
 175
 176         device = cqr->startdev;
 177         if (cqr->retries < 0) {
 178                 DBF_DEV_EVENT(DBF_ERR, device, "DIAG start_IO: request %p "
 179                             "- no retry left)", cqr);
 180                 cqr->status = DASD_CQR_ERROR;
 181                 return -EIO;
 182         }
 183         private = (struct dasd_diag_private *) device->private;
 184         dreq = (struct dasd_diag_req *) cqr->data;
 185
 186         private->iob.dev_nr = private->dev_id.devno;
 187         private->iob.key = 0;
 188         private->iob.flags = DASD_DIAG_RWFLAG_ASYNC;
 189         private->iob.block_count = dreq->block_count;
 190         private->iob.interrupt_params = (addr_t) cqr;
 191         private->iob.bio_list = dreq->bio;
 192         private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT;
 193
 194         cqr->startclk = get_tod_clock();
 195         cqr->starttime = jiffies;
 196         cqr->retries--;
 197
 198         rc = dia250(&private->iob, RW_BIO);
 199         switch (rc) {
 200         case 0: /* Synchronous I/O finished successfully */
 201                 cqr->stopclk = get_tod_clock();
 202                 cqr->status = DASD_CQR_SUCCESS;
 203                 /* Indicate to calling function that only a dasd_schedule_bh()
 204                    and no timer is needed */
 205                 rc = -EACCES;
 206                 break;
 207         case 8: /* Asynchronous I/O was started */
 208                 cqr->status = DASD_CQR_IN_IO;
 209                 rc = 0;
 210                 break;
 211         default: /* Error condition */
 212                 cqr->status = DASD_CQR_QUEUED;
 213                 DBF_DEV_EVENT(DBF_WARNING, device, "dia250 returned rc=%d", rc);
 214                 dasd_diag_erp(device);
 215                 rc = -EIO;
 216                 break;
 217         }
 218         cqr->intrc = rc;
 219         return rc;
 220 }
 221
 222 /* Terminate given request at the device. */
 223 static int
 224 dasd_diag_term_IO(struct dasd_ccw_req * cqr)
 225 {
 226         struct dasd_device *device;
 227
 228         device = cqr->startdev;
 229         mdsk_term_io(device);
 230         mdsk_init_io(device, device->block->bp_block, 0, NULL);
 231         cqr->status = DASD_CQR_CLEAR_PENDING;
 232         cqr->stopclk = get_tod_clock();
 233         dasd_schedule_device_bh(device);
 234         return 0;
 235 }
 236
 237 /* Handle external interruption. */
 238 static void dasd_ext_handler(struct ext_code ext_code,
 239                              unsigned int param32, unsigned long param64)
 240 {
 241         struct dasd_ccw_req *cqr, *next;
 242         struct dasd_device *device;
 243         unsigned long long expires;
 244         unsigned long flags;
 245         addr_t ip;
 246         int rc;
 247
 248         switch (ext_code.subcode >> 8) {
 249         case DASD_DIAG_CODE_31BIT:
 250                 ip = (addr_t) param32;
 251                 break;
 252         case DASD_DIAG_CODE_64BIT:
 253                 ip = (addr_t) param64;
 254                 break;
 255         default:
 256                 return;
 257         }
 258         inc_irq_stat(IRQEXT_DSD);
 259         if (!ip) {              /* no intparm: unsolicited interrupt */
 260                 DBF_EVENT(DBF_NOTICE, "%s", "caught unsolicited "
 261                               "interrupt");
 262                 return;
 263         }
 264         cqr = (struct dasd_ccw_req *) ip;
 265         device = (struct dasd_device *) cqr->startdev;
 266         if (strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
 267                 DBF_DEV_EVENT(DBF_WARNING, device,
 268                             " magic number of dasd_ccw_req 0x%08X doesn't"
 269                             " match discipline 0x%08X",
 270                             cqr->magic, *(int *) (&device->discipline->name));
 271                 return;
 272         }
 273
 274         /* get irq lock to modify request queue */
 275         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 276
 277         /* Check for a pending clear operation */
 278         if (cqr->status == DASD_CQR_CLEAR_PENDING) {
 279                 cqr->status = DASD_CQR_CLEARED;
 280                 dasd_device_clear_timer(device);
 281                 dasd_schedule_device_bh(device);
 282                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 283                 return;
 284         }
 285
 286         cqr->stopclk = get_tod_clock();
 287
 288         expires = 0;
 289         if ((ext_code.subcode & 0xff) == 0) {
 290                 cqr->status = DASD_CQR_SUCCESS;
 291                 /* Start first request on queue if possible -> fast_io. */
 292                 if (!list_empty(&device->ccw_queue)) {
 293                         next = list_entry(device->ccw_queue.next,
 294                                           struct dasd_ccw_req, devlist);
 295                         if (next->status == DASD_CQR_QUEUED) {
 296                                 rc = dasd_start_diag(next);
 297                                 if (rc == 0)
 298                                         expires = next->expires;
 299                         }
 300                 }
 301         } else {
 302                 cqr->status = DASD_CQR_QUEUED;
 303                 DBF_DEV_EVENT(DBF_DEBUG, device, "interrupt status for "
 304                               "request %p was %d (%d retries left)", cqr,
 305                               ext_code.subcode & 0xff, cqr->retries);
 306                 dasd_diag_erp(device);
 307         }
 308
 309         if (expires != 0)
 310                 dasd_device_set_timer(device, expires);
 311         else
 312                 dasd_device_clear_timer(device);
 313         dasd_schedule_device_bh(device);
 314
 315         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 316 }
 317
 318 /* Check whether device can be controlled by DIAG discipline. Return zero on
 319  * success, non-zero otherwise. */
 320 static int
 321 dasd_diag_check_device(struct dasd_device *device)
 322 {
 323         struct dasd_block *block;
 324         struct dasd_diag_private *private;
 325         struct dasd_diag_characteristics *rdc_data;
 326         struct dasd_diag_bio bio;
 327         struct vtoc_cms_label *label;
 328         blocknum_t end_block;
 329         unsigned int sb, bsize;
 330         int rc;
 331
 332         private = (struct dasd_diag_private *) device->private;
 333         if (private == NULL) {
 334                 private = kzalloc(sizeof(struct dasd_diag_private),GFP_KERNEL);
 335                 if (private == NULL) {
 336                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 337                                 "Allocating memory for private DASD data "
 338                                       "failed\n");
 339                         return -ENOMEM;
 340                 }
 341                 ccw_device_get_id(device->cdev, &private->dev_id);
 342                 device->private = (void *) private;
 343         }
 344         block = dasd_alloc_block();
 345         if (IS_ERR(block)) {
 346                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 347                             "could not allocate dasd block structure");
 348                 device->private = NULL;
 349                 kfree(private);
 350                 return PTR_ERR(block);
 351         }
 352         device->block = block;
 353         block->base = device;
 354
 355         /* Read Device Characteristics */
 356         rdc_data = (void *) &(private->rdc_data);
 357         rdc_data->dev_nr = private->dev_id.devno;
 358         rdc_data->rdc_len = sizeof (struct dasd_diag_characteristics);
 359
 360         rc = diag210((struct diag210 *) rdc_data);
 361         if (rc) {
 362                 DBF_DEV_EVENT(DBF_WARNING, device, "failed to retrieve device "
 363                             "information (rc=%d)", rc);
 364                 rc = -EOPNOTSUPP;
 365                 goto out;
 366         }
 367
 368         device->default_expires = DIAG_TIMEOUT;
 369         device->default_retries = DIAG_MAX_RETRIES;
 370
 371         /* Figure out position of label block */
 372         switch (private->rdc_data.vdev_class) {
 373         case DEV_CLASS_FBA:
 374                 private->pt_block = 1;
 375                 break;
 376         case DEV_CLASS_ECKD:
 377                 private->pt_block = 2;
 378                 break;
 379         default:
 380                 pr_warning("%s: Device type %d is not supported "
 381                            "in DIAG mode\n", dev_name(&device->cdev->dev),
 382                            private->rdc_data.vdev_class);
 383                 rc = -EOPNOTSUPP;
 384                 goto out;
 385         }
 386
 387         DBF_DEV_EVENT(DBF_INFO, device,
 388                       "%04X: %04X on real %04X/%02X",
 389                       rdc_data->dev_nr,
 390                       rdc_data->vdev_type,
 391                       rdc_data->rdev_type, rdc_data->rdev_model);
 392
 393         /* terminate all outstanding operations */
 394         mdsk_term_io(device);
 395
 396         /* figure out blocksize of device */
 397         label = (struct vtoc_cms_label *) get_zeroed_page(GFP_KERNEL);
 398         if (label == NULL)  {
 399                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 400                             "No memory to allocate initialization request");
 401                 rc = -ENOMEM;
 402                 goto out;
 403         }
 404         rc = 0;
 405         end_block = 0;
 406         /* try all sizes - needed for ECKD devices */
 407         for (bsize = 512; bsize <= PAGE_SIZE; bsize <<= 1) {
 408                 mdsk_init_io(device, bsize, 0, &end_block);
 409                 memset(&bio, 0, sizeof (struct dasd_diag_bio));
 410                 bio.type = MDSK_READ_REQ;
 411                 bio.block_number = private->pt_block + 1;
 412                 bio.buffer = label;
 413                 memset(&private->iob, 0, sizeof (struct dasd_diag_rw_io));
 414                 private->iob.dev_nr = rdc_data->dev_nr;
 415                 private->iob.key = 0;
 416                 private->iob.flags = 0; /* do synchronous io */
 417                 private->iob.block_count = 1;
 418                 private->iob.interrupt_params = 0;
 419                 private->iob.bio_list = &bio;
 420                 private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT;
 421                 rc = dia250(&private->iob, RW_BIO);
 422                 if (rc == 3) {
 423                         pr_warning("%s: A 64-bit DIAG call failed\n",
 424                                    dev_name(&device->cdev->dev));
 425                         rc = -EOPNOTSUPP;
 426                         goto out_label;
 427                 }
 428                 mdsk_term_io(device);
 429                 if (rc == 0)
 430                         break;
 431         }
 432         if (bsize > PAGE_SIZE) {
 433                 pr_warning("%s: Accessing the DASD failed because of an "
 434                            "incorrect format (rc=%d)\n",
 435                            dev_name(&device->cdev->dev), rc);
 436                 rc = -EIO;
 437                 goto out_label;
 438         }
 439         /* check for label block */
 440         if (memcmp(label->label_id, DASD_DIAG_CMS1,
 441                   sizeof(DASD_DIAG_CMS1)) == 0) {
 442                 /* get formatted blocksize from label block */
 443                 bsize = (unsigned int) label->block_size;
 444                 block->blocks = (unsigned long) label->block_count;
 445         } else
 446                 block->blocks = end_block;
 447         block->bp_block = bsize;
 448         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
 449         for (sb = 512; sb < bsize; sb = sb << 1)
 450                 block->s2b_shift++;
 451         rc = mdsk_init_io(device, block->bp_block, 0, NULL);
 452         if (rc && (rc != 4)) {
 453                 pr_warning("%s: DIAG initialization failed with rc=%d\n",
 454                            dev_name(&device->cdev->dev), rc);
 455                 rc = -EIO;
 456         } else {
 457                 if (rc == 4)
 458                         set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
 459                 pr_info("%s: New DASD with %ld byte/block, total size %ld "
 460                         "KB%s\n", dev_name(&device->cdev->dev),
 461                         (unsigned long) block->bp_block,
 462                         (unsigned long) (block->blocks <<
 463                                          block->s2b_shift) >> 1,
 464                         (rc == 4) ? ", read-only device" : "");
 465                 rc = 0;
 466         }
 467 out_label:
 468         free_page((long) label);
 469 out:
 470         if (rc) {
 471                 device->block = NULL;
 472                 dasd_free_block(block);
 473                 device->private = NULL;
 474                 kfree(private);
 475         }
 476         return rc;
 477 }
 478
 479 /* Fill in virtual disk geometry for device. Return zero on success, non-zero
 480  * otherwise. */
 481 static int
 482 dasd_diag_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
 483 {
 484         if (dasd_check_blocksize(block->bp_block) != 0)
 485                 return -EINVAL;
 486         geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
 487         geo->heads = 16;
 488         geo->sectors = 128 >> block->s2b_shift;
 489         return 0;
 490 }
 491
 492 static dasd_erp_fn_t
 493 dasd_diag_erp_action(struct dasd_ccw_req * cqr)
 494 {
 495         return dasd_default_erp_action;
 496 }
 497
 498 static dasd_erp_fn_t
 499 dasd_diag_erp_postaction(struct dasd_ccw_req * cqr)
 500 {
 501         return dasd_default_erp_postaction;
 502 }
 503
 504 /* Create DASD request from block device request. Return pointer to new
 505  * request on success, ERR_PTR otherwise. */
 506 static struct dasd_ccw_req *dasd_diag_build_cp(struct dasd_device *memdev,
 507                                                struct dasd_block *block,
 508                                                struct request *req)
 509 {
 510         struct dasd_ccw_req *cqr;
 511         struct dasd_diag_req *dreq;
 512         struct dasd_diag_bio *dbio;
 513         struct req_iterator iter;
 514         struct bio_vec bv;
 515         char *dst;
 516         unsigned int count, datasize;
 517         sector_t recid, first_rec, last_rec;
 518         unsigned int blksize, off;
 519         unsigned char rw_cmd;
 520
 521         if (rq_data_dir(req) == READ)
 522                 rw_cmd = MDSK_READ_REQ;
 523         else if (rq_data_dir(req) == WRITE)
 524                 rw_cmd = MDSK_WRITE_REQ;
 525         else
 526                 return ERR_PTR(-EINVAL);
 527         blksize = block->bp_block;
 528         /* Calculate record id of first and last block. */
 529         first_rec = blk_rq_pos(req) >> block->s2b_shift;
 530         last_rec =
 531                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
 532         /* Check struct bio and count the number of blocks for the request. */
 533         count = 0;
 534         rq_for_each_segment(bv, req, iter) {
 535                 if (bv.bv_len & (blksize - 1))
 536                         /* Fba can only do full blocks. */
 537                         return ERR_PTR(-EINVAL);
 538                 count += bv.bv_len >> (block->s2b_shift + 9);
 539         }
 540         /* Paranoia. */
 541         if (count != last_rec - first_rec + 1)
 542                 return ERR_PTR(-EINVAL);
 543         /* Build the request */
 544         datasize = sizeof(struct dasd_diag_req) +
 545                 count*sizeof(struct dasd_diag_bio);
 546         cqr = dasd_smalloc_request(DASD_DIAG_MAGIC, 0, datasize, memdev);
 547         if (IS_ERR(cqr))
 548                 return cqr;
 549
 550         dreq = (struct dasd_diag_req *) cqr->data;
 551         dreq->block_count = count;
 552         dbio = dreq->bio;
 553         recid = first_rec;
 554         rq_for_each_segment(bv, req, iter) {
 555                 dst = page_address(bv.bv_page) + bv.bv_offset;
 556                 for (off = 0; off < bv.bv_len; off += blksize) {
 557                         memset(dbio, 0, sizeof (struct dasd_diag_bio));
 558                         dbio->type = rw_cmd;
 559                         dbio->block_number = recid + 1;
 560                         dbio->buffer = dst;
 561                         dbio++;
 562                         dst += blksize;
 563                         recid++;
 564                 }
 565         }
 566         cqr->retries = memdev->default_retries;
 567         cqr->buildclk = get_tod_clock();
 568         if (blk_noretry_request(req) ||
 569             block->base->features & DASD_FEATURE_FAILFAST)
 570                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
 571         cqr->startdev = memdev;
 572         cqr->memdev = memdev;
 573         cqr->block = block;
 574         cqr->expires = memdev->default_expires * HZ;
 575         cqr->status = DASD_CQR_FILLED;
 576         return cqr;
 577 }
 578
 579 /* Release DASD request. Return non-zero if request was successful, zero
 580  * otherwise. */
 581 static int
 582 dasd_diag_free_cp(struct dasd_ccw_req *cqr, struct request *req)
 583 {
 584         int status;
 585
 586         status = cqr->status == DASD_CQR_DONE;
 587         dasd_sfree_request(cqr, cqr->memdev);
 588         return status;
 589 }
 590
 591 static void dasd_diag_handle_terminated_request(struct dasd_ccw_req *cqr)
 592 {
 593         if (cqr->retries < 0)
 594                 cqr->status = DASD_CQR_FAILED;
 595         else
 596                 cqr->status = DASD_CQR_FILLED;
 597 };
 598
 599 /* Fill in IOCTL data for device. */
 600 static int
 601 dasd_diag_fill_info(struct dasd_device * device,
 602                     struct dasd_information2_t * info)
 603 {
 604         struct dasd_diag_private *private;
 605
 606         private = (struct dasd_diag_private *) device->private;
 607         info->label_block = (unsigned int) private->pt_block;
 608         info->FBA_layout = 1;
 609         info->format = DASD_FORMAT_LDL;
 610         info->characteristics_size = sizeof (struct dasd_diag_characteristics);
 611         memcpy(info->characteristics,
 612                &((struct dasd_diag_private *) device->private)->rdc_data,
 613                sizeof (struct dasd_diag_characteristics));
 614         info->confdata_size = 0;
 615         return 0;
 616 }
 617
 618 static void
 619 dasd_diag_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
 620                      struct irb *stat)
 621 {
 622         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 623                     "dump sense not available for DIAG data");
 624 }
 625
 626 static struct dasd_discipline dasd_diag_discipline = {
 627         .owner = THIS_MODULE,
 628         .name = "DIAG",
 629         .ebcname = "DIAG",
 630         .max_blocks = DIAG_MAX_BLOCKS,
 631         .check_device = dasd_diag_check_device,
 632         .verify_path = dasd_generic_verify_path,
 633         .fill_geometry = dasd_diag_fill_geometry,
 634         .start_IO = dasd_start_diag,
 635         .term_IO = dasd_diag_term_IO,
 636         .handle_terminated_request = dasd_diag_handle_terminated_request,
 637         .erp_action = dasd_diag_erp_action,
 638         .erp_postaction = dasd_diag_erp_postaction,
 639         .build_cp = dasd_diag_build_cp,
 640         .free_cp = dasd_diag_free_cp,
 641         .dump_sense = dasd_diag_dump_sense,
 642         .fill_info = dasd_diag_fill_info,
 643 };
 644
 645 static int __init
 646 dasd_diag_init(void)
 647 {
 648         if (!MACHINE_IS_VM) {
 649                 pr_info("Discipline %s cannot be used without z/VM\n",
 650                         dasd_diag_discipline.name);
 651                 return -ENODEV;
 652         }
 653         ASCEBC(dasd_diag_discipline.ebcname, 4);
 654
 655         irq_subclass_register(IRQ_SUBCLASS_SERVICE_SIGNAL);
 656         register_external_irq(EXT_IRQ_CP_SERVICE, dasd_ext_handler);
 657         dasd_diag_discipline_pointer = &dasd_diag_discipline;
 658         return 0;
 659 }
 660
 661 static void __exit
 662 dasd_diag_cleanup(void)
 663 {
 664         unregister_external_irq(EXT_IRQ_CP_SERVICE, dasd_ext_handler);
 665         irq_subclass_unregister(IRQ_SUBCLASS_SERVICE_SIGNAL);
 666         dasd_diag_discipline_pointer = NULL;
 667 }
 668
 669 module_init(dasd_diag_init);
 670 module_exit(dasd_diag_cleanup);