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