release/src-rt-6.x.4708/linux/linux-2.6.36/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"
  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/vtoc.h>
  28 #include <asm/diag.h>
  29
  30 #include "dasd_int.h"
  31 #include "dasd_diag.h"
  32
  33 #define PRINTK_HEADER "dasd(diag):"
  34
  35 MODULE_LICENSE("GPL");
  36
  37 /* The maximum number of blocks per request (max_blocks) is dependent on the
  38  * amount of storage that is available in the static I/O buffer for each
  39  * device. Currently each device gets 2 pages. We want to fit two requests
  40  * into the available memory so that we can immediately start the next if one
  41  * finishes. */
  42 #define DIAG_MAX_BLOCKS (((2 * PAGE_SIZE - sizeof(struct dasd_ccw_req) - \
  43                            sizeof(struct dasd_diag_req)) / \
  44                            sizeof(struct dasd_diag_bio)) / 2)
  45 #define DIAG_MAX_RETRIES        32
  46 #define DIAG_TIMEOUT            50
  47
  48 static struct dasd_discipline dasd_diag_discipline;
  49
  50 struct dasd_diag_private {
  51         struct dasd_diag_characteristics rdc_data;
  52         struct dasd_diag_rw_io iob;
  53         struct dasd_diag_init_io iib;
  54         blocknum_t pt_block;
  55         struct ccw_dev_id dev_id;
  56 };
  57
  58 struct dasd_diag_req {
  59         unsigned int block_count;
  60         struct dasd_diag_bio bio[0];
  61 };
  62
  63 static const u8 DASD_DIAG_CMS1[] = { 0xc3, 0xd4, 0xe2, 0xf1 };/* EBCDIC CMS1 */
  64
  65 /* Perform DIAG250 call with block I/O parameter list iob (input and output)
  66  * and function code cmd.
  67  * In case of an exception return 3. Otherwise return result of bitwise OR of
  68  * resulting condition code and DIAG return code. */
  69 static inline int dia250(void *iob, int cmd)
  70 {
  71         register unsigned long reg2 asm ("2") = (unsigned long) iob;
  72         typedef union {
  73                 struct dasd_diag_init_io init_io;
  74                 struct dasd_diag_rw_io rw_io;
  75         } addr_type;
  76         int rc;
  77
  78         rc = 3;
  79         asm volatile(
  80                 "       diag    2,%2,0x250\n"
  81                 "0:     ipm     %0\n"
  82                 "       srl     %0,28\n"
  83                 "       or      %0,3\n"
  84                 "1:\n"
  85                 EX_TABLE(0b,1b)
  86                 : "+d" (rc), "=m" (*(addr_type *) iob)
  87                 : "d" (cmd), "d" (reg2), "m" (*(addr_type *) iob)
  88                 : "3", "cc");
  89         return rc;
  90 }
  91
  92 /* Initialize block I/O to DIAG device using the specified blocksize and
  93  * block offset. On success, return zero and set end_block to contain the
  94  * number of blocks on the device minus the specified offset. Return non-zero
  95  * otherwise. */
  96 static inline int
  97 mdsk_init_io(struct dasd_device *device, unsigned int blocksize,
  98              blocknum_t offset, blocknum_t *end_block)
  99 {
 100         struct dasd_diag_private *private;
 101         struct dasd_diag_init_io *iib;
 102         int rc;
 103
 104         private = (struct dasd_diag_private *) device->private;
 105         iib = &private->iib;
 106         memset(iib, 0, sizeof (struct dasd_diag_init_io));
 107
 108         iib->dev_nr = private->dev_id.devno;
 109         iib->block_size = blocksize;
 110         iib->offset = offset;
 111         iib->flaga = DASD_DIAG_FLAGA_DEFAULT;
 112
 113         rc = dia250(iib, INIT_BIO);
 114
 115         if ((rc & 3) == 0 && end_block)
 116                 *end_block = iib->end_block;
 117
 118         return rc;
 119 }
 120
 121 /* Remove block I/O environment for device. Return zero on success, non-zero
 122  * otherwise. */
 123 static inline int
 124 mdsk_term_io(struct dasd_device * device)
 125 {
 126         struct dasd_diag_private *private;
 127         struct dasd_diag_init_io *iib;
 128         int rc;
 129
 130         private = (struct dasd_diag_private *) device->private;
 131         iib = &private->iib;
 132         memset(iib, 0, sizeof (struct dasd_diag_init_io));
 133         iib->dev_nr = private->dev_id.devno;
 134         rc = dia250(iib, TERM_BIO);
 135         return rc;
 136 }
 137
 138 /* Error recovery for failed DIAG requests - try to reestablish the DIAG
 139  * environment. */
 140 static void
 141 dasd_diag_erp(struct dasd_device *device)
 142 {
 143         int rc;
 144
 145         mdsk_term_io(device);
 146         rc = mdsk_init_io(device, device->block->bp_block, 0, NULL);
 147         if (rc == 4) {
 148                 if (!(test_and_set_bit(DASD_FLAG_DEVICE_RO, &device->flags)))
 149                         pr_warning("%s: The access mode of a DIAG device "
 150                                    "changed to read-only\n",
 151                                    dev_name(&device->cdev->dev));
 152                 rc = 0;
 153         }
 154         if (rc)
 155                 pr_warning("%s: DIAG ERP failed with "
 156                             "rc=%d\n", dev_name(&device->cdev->dev), rc);
 157 }
 158
 159 /* Start a given request at the device. Return zero on success, non-zero
 160  * otherwise. */
 161 static int
 162 dasd_start_diag(struct dasd_ccw_req * cqr)
 163 {
 164         struct dasd_device *device;
 165         struct dasd_diag_private *private;
 166         struct dasd_diag_req *dreq;
 167         int rc;
 168
 169         device = cqr->startdev;
 170         if (cqr->retries < 0) {
 171                 DBF_DEV_EVENT(DBF_ERR, device, "DIAG start_IO: request %p "
 172                             "- no retry left)", cqr);
 173                 cqr->status = DASD_CQR_ERROR;
 174                 return -EIO;
 175         }
 176         private = (struct dasd_diag_private *) device->private;
 177         dreq = (struct dasd_diag_req *) cqr->data;
 178
 179         private->iob.dev_nr = private->dev_id.devno;
 180         private->iob.key = 0;
 181         private->iob.flags = DASD_DIAG_RWFLAG_ASYNC;
 182         private->iob.block_count = dreq->block_count;
 183         private->iob.interrupt_params = (addr_t) cqr;
 184         private->iob.bio_list = dreq->bio;
 185         private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT;
 186
 187         cqr->startclk = get_clock();
 188         cqr->starttime = jiffies;
 189         cqr->retries--;
 190
 191         rc = dia250(&private->iob, RW_BIO);
 192         switch (rc) {
 193         case 0: /* Synchronous I/O finished successfully */
 194                 cqr->stopclk = get_clock();
 195                 cqr->status = DASD_CQR_SUCCESS;
 196                 /* Indicate to calling function that only a dasd_schedule_bh()
 197                    and no timer is needed */
 198                 rc = -EACCES;
 199                 break;
 200         case 8: /* Asynchronous I/O was started */
 201                 cqr->status = DASD_CQR_IN_IO;
 202                 rc = 0;
 203                 break;
 204         default: /* Error condition */
 205                 cqr->status = DASD_CQR_QUEUED;
 206                 DBF_DEV_EVENT(DBF_WARNING, device, "dia250 returned rc=%d", rc);
 207                 dasd_diag_erp(device);
 208                 rc = -EIO;
 209                 break;
 210         }
 211         cqr->intrc = rc;
 212         return rc;
 213 }
 214
 215 /* Terminate given request at the device. */
 216 static int
 217 dasd_diag_term_IO(struct dasd_ccw_req * cqr)
 218 {
 219         struct dasd_device *device;
 220
 221         device = cqr->startdev;
 222         mdsk_term_io(device);
 223         mdsk_init_io(device, device->block->bp_block, 0, NULL);
 224         cqr->status = DASD_CQR_CLEAR_PENDING;
 225         cqr->stopclk = get_clock();
 226         dasd_schedule_device_bh(device);
 227         return 0;
 228 }
 229
 230 /* Handle external interruption. */
 231 static void
 232 dasd_ext_handler(__u16 code)
 233 {
 234         struct dasd_ccw_req *cqr, *next;
 235         struct dasd_device *device;
 236         unsigned long long expires;
 237         unsigned long flags;
 238         u8 int_code, status;
 239         addr_t ip;
 240         int rc;
 241
 242         int_code = *((u8 *) DASD_DIAG_LC_INT_CODE);
 243         status = *((u8 *) DASD_DIAG_LC_INT_STATUS);
 244         switch (int_code) {
 245         case DASD_DIAG_CODE_31BIT:
 246                 ip = (addr_t) *((u32 *) DASD_DIAG_LC_INT_PARM_31BIT);
 247                 break;
 248         case DASD_DIAG_CODE_64BIT:
 249                 ip = (addr_t) *((u64 *) DASD_DIAG_LC_INT_PARM_64BIT);
 250                 break;
 251         default:
 252                 return;
 253         }
 254         if (!ip) {              /* no intparm: unsolicited interrupt */
 255                 DBF_EVENT(DBF_NOTICE, "%s", "caught unsolicited "
 256                               "interrupt");
 257                 return;
 258         }
 259         cqr = (struct dasd_ccw_req *) ip;
 260         device = (struct dasd_device *) cqr->startdev;
 261         if (strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
 262                 DBF_DEV_EVENT(DBF_WARNING, device,
 263                             " magic number of dasd_ccw_req 0x%08X doesn't"
 264                             " match discipline 0x%08X",
 265                             cqr->magic, *(int *) (&device->discipline->name));
 266                 return;
 267         }
 268
 269         /* get irq lock to modify request queue */
 270         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 271
 272         /* Check for a pending clear operation */
 273         if (cqr->status == DASD_CQR_CLEAR_PENDING) {
 274                 cqr->status = DASD_CQR_CLEARED;
 275                 dasd_device_clear_timer(device);
 276                 dasd_schedule_device_bh(device);
 277                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 278                 return;
 279         }
 280
 281         cqr->stopclk = get_clock();
 282
 283         expires = 0;
 284         if (status == 0) {
 285                 cqr->status = DASD_CQR_SUCCESS;
 286                 /* Start first request on queue if possible -> fast_io. */
 287                 if (!list_empty(&device->ccw_queue)) {
 288                         next = list_entry(device->ccw_queue.next,
 289                                           struct dasd_ccw_req, devlist);
 290                         if (next->status == DASD_CQR_QUEUED) {
 291                                 rc = dasd_start_diag(next);
 292                                 if (rc == 0)
 293                                         expires = next->expires;
 294                         }
 295                 }
 296         } else {
 297                 cqr->status = DASD_CQR_QUEUED;
 298                 DBF_DEV_EVENT(DBF_DEBUG, device, "interrupt status for "
 299                             "request %p was %d (%d retries left)", cqr, status,
 300                             cqr->retries);
 301                 dasd_diag_erp(device);
 302         }
 303
 304         if (expires != 0)
 305                 dasd_device_set_timer(device, expires);
 306         else
 307                 dasd_device_clear_timer(device);
 308         dasd_schedule_device_bh(device);
 309
 310         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 311 }
 312
 313 /* Check whether device can be controlled by DIAG discipline. Return zero on
 314  * success, non-zero otherwise. */
 315 static int
 316 dasd_diag_check_device(struct dasd_device *device)
 317 {
 318         struct dasd_block *block;
 319         struct dasd_diag_private *private;
 320         struct dasd_diag_characteristics *rdc_data;
 321         struct dasd_diag_bio bio;
 322         struct vtoc_cms_label *label;
 323         blocknum_t end_block;
 324         unsigned int sb, bsize;
 325         int rc;
 326
 327         private = (struct dasd_diag_private *) device->private;
 328         if (private == NULL) {
 329                 private = kzalloc(sizeof(struct dasd_diag_private),GFP_KERNEL);
 330                 if (private == NULL) {
 331                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 332                                 "Allocating memory for private DASD data "
 333                                       "failed\n");
 334                         return -ENOMEM;
 335                 }
 336                 ccw_device_get_id(device->cdev, &private->dev_id);
 337                 device->private = (void *) private;
 338         }
 339         block = dasd_alloc_block();
 340         if (IS_ERR(block)) {
 341                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 342                             "could not allocate dasd block structure");
 343                 device->private = NULL;
 344                 kfree(private);
 345                 return PTR_ERR(block);
 346         }
 347         device->block = block;
 348         block->base = device;
 349
 350         /* Read Device Characteristics */
 351         rdc_data = (void *) &(private->rdc_data);
 352         rdc_data->dev_nr = private->dev_id.devno;
 353         rdc_data->rdc_len = sizeof (struct dasd_diag_characteristics);
 354
 355         rc = diag210((struct diag210 *) rdc_data);
 356         if (rc) {
 357                 DBF_DEV_EVENT(DBF_WARNING, device, "failed to retrieve device "
 358                             "information (rc=%d)", rc);
 359                 rc = -EOPNOTSUPP;
 360                 goto out;
 361         }
 362
 363         device->default_expires = DIAG_TIMEOUT;
 364
 365         /* Figure out position of label block */
 366         switch (private->rdc_data.vdev_class) {
 367         case DEV_CLASS_FBA:
 368                 private->pt_block = 1;
 369                 break;
 370         case DEV_CLASS_ECKD:
 371                 private->pt_block = 2;
 372                 break;
 373         default:
 374                 pr_warning("%s: Device type %d is not supported "
 375                            "in DIAG mode\n", dev_name(&device->cdev->dev),
 376                            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                         pr_warning("%s: A 64-bit DIAG call failed\n",
 418                                    dev_name(&device->cdev->dev));
 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                 pr_warning("%s: Accessing the DASD failed because of an "
 428                            "incorrect format (rc=%d)\n",
 429                            dev_name(&device->cdev->dev), rc);
 430                 rc = -EIO;
 431                 goto out_label;
 432         }
 433         /* check for label block */
 434         if (memcmp(label->label_id, DASD_DIAG_CMS1,
 435                   sizeof(DASD_DIAG_CMS1)) == 0) {
 436                 /* get formatted blocksize from label block */
 437                 bsize = (unsigned int) label->block_size;
 438                 block->blocks = (unsigned long) label->block_count;
 439         } else
 440                 block->blocks = end_block;
 441         block->bp_block = bsize;
 442         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
 443         for (sb = 512; sb < bsize; sb = sb << 1)
 444                 block->s2b_shift++;
 445         rc = mdsk_init_io(device, block->bp_block, 0, NULL);
 446         if (rc && (rc != 4)) {
 447                 pr_warning("%s: DIAG initialization failed with rc=%d\n",
 448                            dev_name(&device->cdev->dev), rc);
 449                 rc = -EIO;
 450         } else {
 451                 if (rc == 4)
 452                         set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
 453                 pr_info("%s: New DASD with %ld byte/block, total size %ld "
 454                         "KB%s\n", dev_name(&device->cdev->dev),
 455                         (unsigned long) block->bp_block,
 456                         (unsigned long) (block->blocks <<
 457                                          block->s2b_shift) >> 1,
 458                         (rc == 4) ? ", read-only device" : "");
 459                 rc = 0;
 460         }
 461 out_label:
 462         free_page((long) label);
 463 out:
 464         if (rc) {
 465                 device->block = NULL;
 466                 dasd_free_block(block);
 467                 device->private = NULL;
 468                 kfree(private);
 469         }
 470         return rc;
 471 }
 472
 473 /* Fill in virtual disk geometry for device. Return zero on success, non-zero
 474  * otherwise. */
 475 static int
 476 dasd_diag_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
 477 {
 478         if (dasd_check_blocksize(block->bp_block) != 0)
 479                 return -EINVAL;
 480         geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
 481         geo->heads = 16;
 482         geo->sectors = 128 >> block->s2b_shift;
 483         return 0;
 484 }
 485
 486 static dasd_erp_fn_t
 487 dasd_diag_erp_action(struct dasd_ccw_req * cqr)
 488 {
 489         return dasd_default_erp_action;
 490 }
 491
 492 static dasd_erp_fn_t
 493 dasd_diag_erp_postaction(struct dasd_ccw_req * cqr)
 494 {
 495         return dasd_default_erp_postaction;
 496 }
 497
 498 /* Create DASD request from block device request. Return pointer to new
 499  * request on success, ERR_PTR otherwise. */
 500 static struct dasd_ccw_req *dasd_diag_build_cp(struct dasd_device *memdev,
 501                                                struct dasd_block *block,
 502                                                struct request *req)
 503 {
 504         struct dasd_ccw_req *cqr;
 505         struct dasd_diag_req *dreq;
 506         struct dasd_diag_bio *dbio;
 507         struct req_iterator iter;
 508         struct bio_vec *bv;
 509         char *dst;
 510         unsigned int count, datasize;
 511         sector_t recid, first_rec, last_rec;
 512         unsigned int blksize, off;
 513         unsigned char rw_cmd;
 514
 515         if (rq_data_dir(req) == READ)
 516                 rw_cmd = MDSK_READ_REQ;
 517         else if (rq_data_dir(req) == WRITE)
 518                 rw_cmd = MDSK_WRITE_REQ;
 519         else
 520                 return ERR_PTR(-EINVAL);
 521         blksize = block->bp_block;
 522         /* Calculate record id of first and last block. */
 523         first_rec = blk_rq_pos(req) >> block->s2b_shift;
 524         last_rec =
 525                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
 526         /* Check struct bio and count the number of blocks for the request. */
 527         count = 0;
 528         rq_for_each_segment(bv, req, iter) {
 529                 if (bv->bv_len & (blksize - 1))
 530                         /* Fba can only do full blocks. */
 531                         return ERR_PTR(-EINVAL);
 532                 count += bv->bv_len >> (block->s2b_shift + 9);
 533         }
 534         /* Paranoia. */
 535         if (count != last_rec - first_rec + 1)
 536                 return ERR_PTR(-EINVAL);
 537         /* Build the request */
 538         datasize = sizeof(struct dasd_diag_req) +
 539                 count*sizeof(struct dasd_diag_bio);
 540         cqr = dasd_smalloc_request(DASD_DIAG_MAGIC, 0, datasize, memdev);
 541         if (IS_ERR(cqr))
 542                 return cqr;
 543
 544         dreq = (struct dasd_diag_req *) cqr->data;
 545         dreq->block_count = count;
 546         dbio = dreq->bio;
 547         recid = first_rec;
 548         rq_for_each_segment(bv, req, iter) {
 549                 dst = page_address(bv->bv_page) + bv->bv_offset;
 550                 for (off = 0; off < bv->bv_len; off += blksize) {
 551                         memset(dbio, 0, sizeof (struct dasd_diag_bio));
 552                         dbio->type = rw_cmd;
 553                         dbio->block_number = recid + 1;
 554                         dbio->buffer = dst;
 555                         dbio++;
 556                         dst += blksize;
 557                         recid++;
 558                 }
 559         }
 560         cqr->retries = DIAG_MAX_RETRIES;
 561         cqr->buildclk = get_clock();
 562         if (blk_noretry_request(req) ||
 563             block->base->features & DASD_FEATURE_FAILFAST)
 564                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
 565         cqr->startdev = memdev;
 566         cqr->memdev = memdev;
 567         cqr->block = block;
 568         cqr->expires = memdev->default_expires * HZ;
 569         cqr->status = DASD_CQR_FILLED;
 570         return cqr;
 571 }
 572
 573 /* Release DASD request. Return non-zero if request was successful, zero
 574  * otherwise. */
 575 static int
 576 dasd_diag_free_cp(struct dasd_ccw_req *cqr, struct request *req)
 577 {
 578         int status;
 579
 580         status = cqr->status == DASD_CQR_DONE;
 581         dasd_sfree_request(cqr, cqr->memdev);
 582         return status;
 583 }
 584
 585 static void dasd_diag_handle_terminated_request(struct dasd_ccw_req *cqr)
 586 {
 587         cqr->status = DASD_CQR_FILLED;
 588 };
 589
 590 /* Fill in IOCTL data for device. */
 591 static int
 592 dasd_diag_fill_info(struct dasd_device * device,
 593                     struct dasd_information2_t * info)
 594 {
 595         struct dasd_diag_private *private;
 596
 597         private = (struct dasd_diag_private *) device->private;
 598         info->label_block = (unsigned int) private->pt_block;
 599         info->FBA_layout = 1;
 600         info->format = DASD_FORMAT_LDL;
 601         info->characteristics_size = sizeof (struct dasd_diag_characteristics);
 602         memcpy(info->characteristics,
 603                &((struct dasd_diag_private *) device->private)->rdc_data,
 604                sizeof (struct dasd_diag_characteristics));
 605         info->confdata_size = 0;
 606         return 0;
 607 }
 608
 609 static void
 610 dasd_diag_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
 611                      struct irb *stat)
 612 {
 613         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 614                     "dump sense not available for DIAG data");
 615 }
 616
 617 static struct dasd_discipline dasd_diag_discipline = {
 618         .owner = THIS_MODULE,
 619         .name = "DIAG",
 620         .ebcname = "DIAG",
 621         .max_blocks = DIAG_MAX_BLOCKS,
 622         .check_device = dasd_diag_check_device,
 623         .fill_geometry = dasd_diag_fill_geometry,
 624         .start_IO = dasd_start_diag,
 625         .term_IO = dasd_diag_term_IO,
 626         .handle_terminated_request = dasd_diag_handle_terminated_request,
 627         .erp_action = dasd_diag_erp_action,
 628         .erp_postaction = dasd_diag_erp_postaction,
 629         .build_cp = dasd_diag_build_cp,
 630         .free_cp = dasd_diag_free_cp,
 631         .dump_sense = dasd_diag_dump_sense,
 632         .fill_info = dasd_diag_fill_info,
 633 };
 634
 635 static int __init
 636 dasd_diag_init(void)
 637 {
 638         if (!MACHINE_IS_VM) {
 639                 pr_info("Discipline %s cannot be used without z/VM\n",
 640                         dasd_diag_discipline.name);
 641                 return -ENODEV;
 642         }
 643         ASCEBC(dasd_diag_discipline.ebcname, 4);
 644
 645         ctl_set_bit(0, 9);
 646         register_external_interrupt(0x2603, dasd_ext_handler);
 647         dasd_diag_discipline_pointer = &dasd_diag_discipline;
 648         return 0;
 649 }
 650
 651 static void __exit
 652 dasd_diag_cleanup(void)
 653 {
 654         unregister_external_interrupt(0x2603, dasd_ext_handler);
 655         ctl_clear_bit(0, 9);
 656         dasd_diag_discipline_pointer = NULL;
 657 }
 658
 659 module_init(dasd_diag_init);
 660 module_exit(dasd_diag_cleanup);