drivers/s390/block/dasd_diag.c

   1 /*
   2  * File...........: linux/drivers/s390/block/dasd_diag.c
   3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4  * Based on.......: linux/drivers/s390/block/mdisk.c
   5  * ...............: by Hartmunt Penner <hpenner@de.ibm.com>
   6  * Bugreports.to..: <Linux390@de.ibm.com>
   7  * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
   8  *
   9  */
  10
  11 #define KMSG_COMPONENT "dasd-diag"
  12
  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/ebcdic.h>
  25 #include <asm/io.h>
  26 #include <asm/s390_ext.h>
  27 #include <asm/todclk.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 * HZ
  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 /* Initialize block I/O to DIAG device using the specified blocksize and
  94  * block offset. On success, return zero and set end_block to contain the
  95  * number of blocks on the device minus the specified offset. Return non-zero
  96  * otherwise. */
  97 static inline int
  98 mdsk_init_io(struct dasd_device *device, unsigned int blocksize,
  99              blocknum_t offset, blocknum_t *end_block)
 100 {
 101         struct dasd_diag_private *private;
 102         struct dasd_diag_init_io *iib;
 103         int rc;
 104
 105         private = (struct dasd_diag_private *) device->private;
 106         iib = &private->iib;
 107         memset(iib, 0, sizeof (struct dasd_diag_init_io));
 108
 109         iib->dev_nr = private->dev_id.devno;
 110         iib->block_size = blocksize;
 111         iib->offset = offset;
 112         iib->flaga = DASD_DIAG_FLAGA_DEFAULT;
 113
 114         rc = dia250(iib, INIT_BIO);
 115
 116         if ((rc & 3) == 0 && end_block)
 117                 *end_block = iib->end_block;
 118
 119         return rc;
 120 }
 121
 122 /* Remove block I/O environment for device. Return zero on success, non-zero
 123  * otherwise. */
 124 static inline int
 125 mdsk_term_io(struct dasd_device * device)
 126 {
 127         struct dasd_diag_private *private;
 128         struct dasd_diag_init_io *iib;
 129         int rc;
 130
 131         private = (struct dasd_diag_private *) device->private;
 132         iib = &private->iib;
 133         memset(iib, 0, sizeof (struct dasd_diag_init_io));
 134         iib->dev_nr = private->dev_id.devno;
 135         rc = dia250(iib, TERM_BIO);
 136         return rc;
 137 }
 138
 139 /* Error recovery for failed DIAG requests - try to reestablish the DIAG
 140  * environment. */
 141 static void
 142 dasd_diag_erp(struct dasd_device *device)
 143 {
 144         int rc;
 145
 146         mdsk_term_io(device);
 147         rc = mdsk_init_io(device, device->block->bp_block, 0, NULL);
 148         if (rc == 4) {
 149                 if (!(device->features & DASD_FEATURE_READONLY)) {
 150                         dev_warn(&device->cdev->dev,
 151                                  "The access mode of a DIAG device changed"
 152                                  " to read-only");
 153                         device->features |= DASD_FEATURE_READONLY;
 154                 }
 155                 rc = 0;
 156         }
 157         if (rc)
 158                 dev_warn(&device->cdev->dev, "DIAG ERP failed with "
 159                             "rc=%d\n", rc);
 160 }
 161
 162 /* Start a given request at the device. Return zero on success, non-zero
 163  * otherwise. */
 164 static int
 165 dasd_start_diag(struct dasd_ccw_req * cqr)
 166 {
 167         struct dasd_device *device;
 168         struct dasd_diag_private *private;
 169         struct dasd_diag_req *dreq;
 170         int rc;
 171
 172         device = cqr->startdev;
 173         if (cqr->retries < 0) {
 174                 DBF_DEV_EVENT(DBF_ERR, device, "DIAG start_IO: request %p "
 175                             "- no retry left)", cqr);
 176                 cqr->status = DASD_CQR_ERROR;
 177                 return -EIO;
 178         }
 179         private = (struct dasd_diag_private *) device->private;
 180         dreq = (struct dasd_diag_req *) cqr->data;
 181
 182         private->iob.dev_nr = private->dev_id.devno;
 183         private->iob.key = 0;
 184         private->iob.flags = DASD_DIAG_RWFLAG_ASYNC;
 185         private->iob.block_count = dreq->block_count;
 186         private->iob.interrupt_params = (addr_t) cqr;
 187         private->iob.bio_list = dreq->bio;
 188         private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT;
 189
 190         cqr->startclk = get_clock();
 191         cqr->starttime = jiffies;
 192         cqr->retries--;
 193
 194         rc = dia250(&private->iob, RW_BIO);
 195         switch (rc) {
 196         case 0: /* Synchronous I/O finished successfully */
 197                 cqr->stopclk = get_clock();
 198                 cqr->status = DASD_CQR_SUCCESS;
 199                 /* Indicate to calling function that only a dasd_schedule_bh()
 200                    and no timer is needed */
 201                 rc = -EACCES;
 202                 break;
 203         case 8: /* Asynchronous I/O was started */
 204                 cqr->status = DASD_CQR_IN_IO;
 205                 rc = 0;
 206                 break;
 207         default: /* Error condition */
 208                 cqr->status = DASD_CQR_QUEUED;
 209                 DBF_DEV_EVENT(DBF_WARNING, device, "dia250 returned rc=%d", rc);
 210                 dasd_diag_erp(device);
 211                 rc = -EIO;
 212                 break;
 213         }
 214         cqr->intrc = rc;
 215         return rc;
 216 }
 217
 218 /* Terminate given request at the device. */
 219 static int
 220 dasd_diag_term_IO(struct dasd_ccw_req * cqr)
 221 {
 222         struct dasd_device *device;
 223
 224         device = cqr->startdev;
 225         mdsk_term_io(device);
 226         mdsk_init_io(device, device->block->bp_block, 0, NULL);
 227         cqr->status = DASD_CQR_CLEAR_PENDING;
 228         cqr->stopclk = get_clock();
 229         dasd_schedule_device_bh(device);
 230         return 0;
 231 }
 232
 233 /* Handle external interruption. */
 234 static void
 235 dasd_ext_handler(__u16 code)
 236 {
 237         struct dasd_ccw_req *cqr, *next;
 238         struct dasd_device *device;
 239         unsigned long long expires;
 240         unsigned long flags;
 241         u8 int_code, status;
 242         addr_t ip;
 243         int rc;
 244
 245         int_code = *((u8 *) DASD_DIAG_LC_INT_CODE);
 246         status = *((u8 *) DASD_DIAG_LC_INT_STATUS);
 247         switch (int_code) {
 248         case DASD_DIAG_CODE_31BIT:
 249                 ip = (addr_t) *((u32 *) DASD_DIAG_LC_INT_PARM_31BIT);
 250                 break;
 251         case DASD_DIAG_CODE_64BIT:
 252                 ip = (addr_t) *((u64 *) DASD_DIAG_LC_INT_PARM_64BIT);
 253                 break;
 254         default:
 255                 return;
 256         }
 257         if (!ip) {              /* no intparm: unsolicited interrupt */
 258                 DBF_EVENT(DBF_NOTICE, "%s", "caught unsolicited "
 259                               "interrupt");
 260                 return;
 261         }
 262         cqr = (struct dasd_ccw_req *) ip;
 263         device = (struct dasd_device *) cqr->startdev;
 264         if (strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
 265                 DBF_DEV_EVENT(DBF_WARNING, device,
 266                             " magic number of dasd_ccw_req 0x%08X doesn't"
 267                             " match discipline 0x%08X",
 268                             cqr->magic, *(int *) (&device->discipline->name));
 269                 return;
 270         }
 271
 272         /* get irq lock to modify request queue */
 273         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 274
 275         /* Check for a pending clear operation */
 276         if (cqr->status == DASD_CQR_CLEAR_PENDING) {
 277                 cqr->status = DASD_CQR_CLEARED;
 278                 dasd_device_clear_timer(device);
 279                 dasd_schedule_device_bh(device);
 280                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 281                 return;
 282         }
 283
 284         cqr->stopclk = get_clock();
 285
 286         expires = 0;
 287         if (status == 0) {
 288                 cqr->status = DASD_CQR_SUCCESS;
 289                 /* Start first request on queue if possible -> fast_io. */
 290                 if (!list_empty(&device->ccw_queue)) {
 291                         next = list_entry(device->ccw_queue.next,
 292                                           struct dasd_ccw_req, devlist);
 293                         if (next->status == DASD_CQR_QUEUED) {
 294                                 rc = dasd_start_diag(next);
 295                                 if (rc == 0)
 296                                         expires = next->expires;
 297                         }
 298                 }
 299         } else {
 300                 cqr->status = DASD_CQR_QUEUED;
 301                 DBF_DEV_EVENT(DBF_DEBUG, device, "interrupt status for "
 302                             "request %p was %d (%d retries left)", cqr, status,
 303                             cqr->retries);
 304                 dasd_diag_erp(device);
 305         }
 306
 307         if (expires != 0)
 308                 dasd_device_set_timer(device, expires);
 309         else
 310                 dasd_device_clear_timer(device);
 311         dasd_schedule_device_bh(device);
 312
 313         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 314 }
 315
 316 /* Check whether device can be controlled by DIAG discipline. Return zero on
 317  * success, non-zero otherwise. */
 318 static int
 319 dasd_diag_check_device(struct dasd_device *device)
 320 {
 321         struct dasd_block *block;
 322         struct dasd_diag_private *private;
 323         struct dasd_diag_characteristics *rdc_data;
 324         struct dasd_diag_bio bio;
 325         struct vtoc_cms_label *label;
 326         blocknum_t end_block;
 327         unsigned int sb, bsize;
 328         int rc;
 329
 330         private = (struct dasd_diag_private *) device->private;
 331         if (private == NULL) {
 332                 private = kzalloc(sizeof(struct dasd_diag_private),GFP_KERNEL);
 333                 if (private == NULL) {
 334                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 335                                 "Allocating memory for private DASD data "
 336                                       "failed\n");
 337                         return -ENOMEM;
 338                 }
 339                 ccw_device_get_id(device->cdev, &private->dev_id);
 340                 device->private = (void *) private;
 341         }
 342         block = dasd_alloc_block();
 343         if (IS_ERR(block)) {
 344                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 345                             "could not allocate dasd block structure");
 346                 device->private = NULL;
 347                 kfree(private);
 348                 return PTR_ERR(block);
 349         }
 350         device->block = block;
 351         block->base = device;
 352
 353         /* Read Device Characteristics */
 354         rdc_data = (void *) &(private->rdc_data);
 355         rdc_data->dev_nr = private->dev_id.devno;
 356         rdc_data->rdc_len = sizeof (struct dasd_diag_characteristics);
 357
 358         rc = diag210((struct diag210 *) rdc_data);
 359         if (rc) {
 360                 DBF_DEV_EVENT(DBF_WARNING, device, "failed to retrieve device "
 361                             "information (rc=%d)", rc);
 362                 rc = -EOPNOTSUPP;
 363                 goto out;
 364         }
 365
 366         /* Figure out position of label block */
 367         switch (private->rdc_data.vdev_class) {
 368         case DEV_CLASS_FBA:
 369                 private->pt_block = 1;
 370                 break;
 371         case DEV_CLASS_ECKD:
 372                 private->pt_block = 2;
 373                 break;
 374         default:
 375                 dev_warn(&device->cdev->dev, "Device type %d is not supported "
 376                             "in DIAG mode\n", private->rdc_data.vdev_class);
 377                 rc = -EOPNOTSUPP;
 378                 goto out;
 379         }
 380
 381         DBF_DEV_EVENT(DBF_INFO, device,
 382                       "%04X: %04X on real %04X/%02X",
 383                       rdc_data->dev_nr,
 384                       rdc_data->vdev_type,
 385                       rdc_data->rdev_type, rdc_data->rdev_model);
 386
 387         /* terminate all outstanding operations */
 388         mdsk_term_io(device);
 389
 390         /* figure out blocksize of device */
 391         label = (struct vtoc_cms_label *) get_zeroed_page(GFP_KERNEL);
 392         if (label == NULL)  {
 393                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 394                             "No memory to allocate initialization request");
 395                 rc = -ENOMEM;
 396                 goto out;
 397         }
 398         rc = 0;
 399         end_block = 0;
 400         /* try all sizes - needed for ECKD devices */
 401         for (bsize = 512; bsize <= PAGE_SIZE; bsize <<= 1) {
 402                 mdsk_init_io(device, bsize, 0, &end_block);
 403                 memset(&bio, 0, sizeof (struct dasd_diag_bio));
 404                 bio.type = MDSK_READ_REQ;
 405                 bio.block_number = private->pt_block + 1;
 406                 bio.buffer = label;
 407                 memset(&private->iob, 0, sizeof (struct dasd_diag_rw_io));
 408                 private->iob.dev_nr = rdc_data->dev_nr;
 409                 private->iob.key = 0;
 410                 private->iob.flags = 0; /* do synchronous io */
 411                 private->iob.block_count = 1;
 412                 private->iob.interrupt_params = 0;
 413                 private->iob.bio_list = &bio;
 414                 private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT;
 415                 rc = dia250(&private->iob, RW_BIO);
 416                 if (rc == 3) {
 417                         dev_warn(&device->cdev->dev,
 418                                 "A 64-bit DIAG call failed\n");
 419                         rc = -EOPNOTSUPP;
 420                         goto out_label;
 421                 }
 422                 mdsk_term_io(device);
 423                 if (rc == 0)
 424                         break;
 425         }
 426         if (bsize > PAGE_SIZE) {
 427                 dev_warn(&device->cdev->dev, "Accessing the DASD failed because"
 428                          " of an incorrect format (rc=%d)\n", rc);
 429                 rc = -EIO;
 430                 goto out_label;
 431         }
 432         /* check for label block */
 433         if (memcmp(label->label_id, DASD_DIAG_CMS1,
 434                   sizeof(DASD_DIAG_CMS1)) == 0) {
 435                 /* get formatted blocksize from label block */
 436                 bsize = (unsigned int) label->block_size;
 437                 block->blocks = (unsigned long) label->block_count;
 438         } else
 439                 block->blocks = end_block;
 440         block->bp_block = bsize;
 441         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
 442         for (sb = 512; sb < bsize; sb = sb << 1)
 443                 block->s2b_shift++;
 444         rc = mdsk_init_io(device, block->bp_block, 0, NULL);
 445         if (rc && (rc != 4)) {
 446                 dev_warn(&device->cdev->dev, "DIAG initialization "
 447                         "failed with rc=%d\n", rc);
 448                 rc = -EIO;
 449         } else {
 450                 if (rc == 4)
 451                         device->features |= DASD_FEATURE_READONLY;
 452                 dev_info(&device->cdev->dev,
 453                          "New DASD with %ld byte/block, total size %ld KB%s\n",
 454                          (unsigned long) block->bp_block,
 455                          (unsigned long) (block->blocks <<
 456                                           block->s2b_shift) >> 1,
 457                          (rc == 4) ? ", read-only device" : "");
 458                 rc = 0;
 459         }
 460 out_label:
 461         free_page((long) label);
 462 out:
 463         if (rc) {
 464                 device->block = NULL;
 465                 dasd_free_block(block);
 466                 device->private = NULL;
 467                 kfree(private);
 468         }
 469         return rc;
 470 }
 471
 472 /* Fill in virtual disk geometry for device. Return zero on success, non-zero
 473  * otherwise. */
 474 static int
 475 dasd_diag_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
 476 {
 477         if (dasd_check_blocksize(block->bp_block) != 0)
 478                 return -EINVAL;
 479         geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
 480         geo->heads = 16;
 481         geo->sectors = 128 >> block->s2b_shift;
 482         return 0;
 483 }
 484
 485 static dasd_erp_fn_t
 486 dasd_diag_erp_action(struct dasd_ccw_req * cqr)
 487 {
 488         return dasd_default_erp_action;
 489 }
 490
 491 static dasd_erp_fn_t
 492 dasd_diag_erp_postaction(struct dasd_ccw_req * cqr)
 493 {
 494         return dasd_default_erp_postaction;
 495 }
 496
 497 /* Create DASD request from block device request. Return pointer to new
 498  * request on success, ERR_PTR otherwise. */
 499 static struct dasd_ccw_req *dasd_diag_build_cp(struct dasd_device *memdev,
 500                                                struct dasd_block *block,
 501                                                struct request *req)
 502 {
 503         struct dasd_ccw_req *cqr;
 504         struct dasd_diag_req *dreq;
 505         struct dasd_diag_bio *dbio;
 506         struct req_iterator iter;
 507         struct bio_vec *bv;
 508         char *dst;
 509         unsigned int count, datasize;
 510         sector_t recid, first_rec, last_rec;
 511         unsigned int blksize, off;
 512         unsigned char rw_cmd;
 513
 514         if (rq_data_dir(req) == READ)
 515                 rw_cmd = MDSK_READ_REQ;
 516         else if (rq_data_dir(req) == WRITE)
 517                 rw_cmd = MDSK_WRITE_REQ;
 518         else
 519                 return ERR_PTR(-EINVAL);
 520         blksize = block->bp_block;
 521         /* Calculate record id of first and last block. */
 522         first_rec = blk_rq_pos(req) >> block->s2b_shift;
 523         last_rec =
 524                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
 525         /* Check struct bio and count the number of blocks for the request. */
 526         count = 0;
 527         rq_for_each_segment(bv, req, iter) {
 528                 if (bv->bv_len & (blksize - 1))
 529                         /* Fba can only do full blocks. */
 530                         return ERR_PTR(-EINVAL);
 531                 count += bv->bv_len >> (block->s2b_shift + 9);
 532         }
 533         /* Paranoia. */
 534         if (count != last_rec - first_rec + 1)
 535                 return ERR_PTR(-EINVAL);
 536         /* Build the request */
 537         datasize = sizeof(struct dasd_diag_req) +
 538                 count*sizeof(struct dasd_diag_bio);
 539         cqr = dasd_smalloc_request(DASD_DIAG_MAGIC, 0, datasize, memdev);
 540         if (IS_ERR(cqr))
 541                 return cqr;
 542
 543         dreq = (struct dasd_diag_req *) cqr->data;
 544         dreq->block_count = count;
 545         dbio = dreq->bio;
 546         recid = first_rec;
 547         rq_for_each_segment(bv, req, iter) {
 548                 dst = page_address(bv->bv_page) + bv->bv_offset;
 549                 for (off = 0; off < bv->bv_len; off += blksize) {
 550                         memset(dbio, 0, sizeof (struct dasd_diag_bio));
 551                         dbio->type = rw_cmd;
 552                         dbio->block_number = recid + 1;
 553                         dbio->buffer = dst;
 554                         dbio++;
 555                         dst += blksize;
 556                         recid++;
 557                 }
 558         }
 559         cqr->retries = DIAG_MAX_RETRIES;
 560         cqr->buildclk = get_clock();
 561         if (blk_noretry_request(req) ||
 562             block->base->features & DASD_FEATURE_FAILFAST)
 563                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
 564         cqr->startdev = memdev;
 565         cqr->memdev = memdev;
 566         cqr->block = block;
 567         cqr->expires = DIAG_TIMEOUT;
 568         cqr->status = DASD_CQR_FILLED;
 569         return cqr;
 570 }
 571
 572 /* Release DASD request. Return non-zero if request was successful, zero
 573  * otherwise. */
 574 static int
 575 dasd_diag_free_cp(struct dasd_ccw_req *cqr, struct request *req)
 576 {
 577         int status;
 578
 579         status = cqr->status == DASD_CQR_DONE;
 580         dasd_sfree_request(cqr, cqr->memdev);
 581         return status;
 582 }
 583
 584 static void dasd_diag_handle_terminated_request(struct dasd_ccw_req *cqr)
 585 {
 586         cqr->status = DASD_CQR_FILLED;
 587 };
 588
 589 /* Fill in IOCTL data for device. */
 590 static int
 591 dasd_diag_fill_info(struct dasd_device * device,
 592                     struct dasd_information2_t * info)
 593 {
 594         struct dasd_diag_private *private;
 595
 596         private = (struct dasd_diag_private *) device->private;
 597         info->label_block = (unsigned int) private->pt_block;
 598         info->FBA_layout = 1;
 599         info->format = DASD_FORMAT_LDL;
 600         info->characteristics_size = sizeof (struct dasd_diag_characteristics);
 601         memcpy(info->characteristics,
 602                &((struct dasd_diag_private *) device->private)->rdc_data,
 603                sizeof (struct dasd_diag_characteristics));
 604         info->confdata_size = 0;
 605         return 0;
 606 }
 607
 608 static void
 609 dasd_diag_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
 610                      struct irb *stat)
 611 {
 612         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 613                     "dump sense not available for DIAG data");
 614 }
 615
 616 static struct dasd_discipline dasd_diag_discipline = {
 617         .owner = THIS_MODULE,
 618         .name = "DIAG",
 619         .ebcname = "DIAG",
 620         .max_blocks = DIAG_MAX_BLOCKS,
 621         .check_device = dasd_diag_check_device,
 622         .fill_geometry = dasd_diag_fill_geometry,
 623         .start_IO = dasd_start_diag,
 624         .term_IO = dasd_diag_term_IO,
 625         .handle_terminated_request = dasd_diag_handle_terminated_request,
 626         .erp_action = dasd_diag_erp_action,
 627         .erp_postaction = dasd_diag_erp_postaction,
 628         .build_cp = dasd_diag_build_cp,
 629         .free_cp = dasd_diag_free_cp,
 630         .dump_sense = dasd_diag_dump_sense,
 631         .fill_info = dasd_diag_fill_info,
 632 };
 633
 634 static int __init
 635 dasd_diag_init(void)
 636 {
 637         if (!MACHINE_IS_VM) {
 638                 pr_info("Discipline %s cannot be used without z/VM\n",
 639                         dasd_diag_discipline.name);
 640                 return -ENODEV;
 641         }
 642         ASCEBC(dasd_diag_discipline.ebcname, 4);
 643
 644         ctl_set_bit(0, 9);
 645         register_external_interrupt(0x2603, dasd_ext_handler);
 646         dasd_diag_discipline_pointer = &dasd_diag_discipline;
 647         return 0;
 648 }
 649
 650 static void __exit
 651 dasd_diag_cleanup(void)
 652 {
 653         unregister_external_interrupt(0x2603, dasd_ext_handler);
 654         ctl_clear_bit(0, 9);
 655         dasd_diag_discipline_pointer = NULL;
 656 }
 657
 658 module_init(dasd_diag_init);
 659 module_exit(dasd_diag_cleanup);