drivers/s390/block/dasd_diag.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   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  * Copyright IBM Corp. 1999, 2000
   8  *
   9  */
  10
  11 #define KMSG_COMPONENT "dasd"
  12
  13 #include <linux/kernel_stat.h>
  14 #include <linux/stddef.h>
  15 #include <linux/kernel.h>
  16 #include <linux/slab.h>
  17 #include <linux/hdreg.h>
  18 #include <linux/bio.h>
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21 #include <linux/jiffies.h>
  22 #include <asm/asm-extable.h>
  23 #include <asm/dasd.h>
  24 #include <asm/debug.h>
  25 #include <asm/diag.h>
  26 #include <asm/ebcdic.h>
  27 #include <asm/io.h>
  28 #include <asm/irq.h>
  29 #include <asm/vtoc.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[];
  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         union register_pair rx = { .even = (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 cc;
  78
  79         cc = 3;
  80         asm volatile(
  81                 "       diag    %[rx],%[cmd],0x250\n"
  82                 "0:     ipm     %[cc]\n"
  83                 "       srl     %[cc],28\n"
  84                 "1:\n"
  85                 EX_TABLE(0b,1b)
  86                 : [cc] "+&d" (cc), [rx] "+&d" (rx.pair), "+m" (*(addr_type *)iob)
  87                 : [cmd] "d" (cmd)
  88                 : "cc");
  89         return cc | rx.odd;
  90 }
  91
  92 static inline int dia250(void *iob, int cmd)
  93 {
  94         diag_stat_inc(DIAG_STAT_X250);
  95         return __dia250(iob, cmd);
  96 }
  97
  98 /* Initialize block I/O to DIAG device using the specified blocksize and
  99  * block offset. On success, return zero and set end_block to contain the
 100  * number of blocks on the device minus the specified offset. Return non-zero
 101  * otherwise. */
 102 static inline int
 103 mdsk_init_io(struct dasd_device *device, unsigned int blocksize,
 104              blocknum_t offset, blocknum_t *end_block)
 105 {
 106         struct dasd_diag_private *private = device->private;
 107         struct dasd_diag_init_io *iib = &private->iib;
 108         int rc;
 109
 110         memset(iib, 0, sizeof (struct dasd_diag_init_io));
 111
 112         iib->dev_nr = private->dev_id.devno;
 113         iib->block_size = blocksize;
 114         iib->offset = offset;
 115         iib->flaga = DASD_DIAG_FLAGA_DEFAULT;
 116
 117         rc = dia250(iib, INIT_BIO);
 118
 119         if ((rc & 3) == 0 && end_block)
 120                 *end_block = iib->end_block;
 121
 122         return rc;
 123 }
 124
 125 /* Remove block I/O environment for device. Return zero on success, non-zero
 126  * otherwise. */
 127 static inline int
 128 mdsk_term_io(struct dasd_device * device)
 129 {
 130         struct dasd_diag_private *private = device->private;
 131         struct dasd_diag_init_io *iib = &private->iib;
 132         int rc;
 133
 134         memset(iib, 0, sizeof (struct dasd_diag_init_io));
 135         iib->dev_nr = private->dev_id.devno;
 136         rc = dia250(iib, TERM_BIO);
 137         return rc;
 138 }
 139
 140 /* Error recovery for failed DIAG requests - try to reestablish the DIAG
 141  * environment. */
 142 static void
 143 dasd_diag_erp(struct dasd_device *device)
 144 {
 145         int rc;
 146
 147         mdsk_term_io(device);
 148         rc = mdsk_init_io(device, device->block->bp_block, 0, NULL);
 149         if (rc == 4) {
 150                 if (!(test_and_set_bit(DASD_FLAG_DEVICE_RO, &device->flags)))
 151                         pr_warn("%s: The access mode of a DIAG device changed to read-only\n",
 152                                 dev_name(&device->cdev->dev));
 153                 rc = 0;
 154         }
 155         if (rc)
 156                 pr_warn("%s: DIAG ERP failed with rc=%d\n",
 157                         dev_name(&device->cdev->dev), rc);
 158 }
 159
 160 /* Start a given request at the device. Return zero on success, non-zero
 161  * otherwise. */
 162 static int
 163 dasd_start_diag(struct dasd_ccw_req * cqr)
 164 {
 165         struct dasd_device *device;
 166         struct dasd_diag_private *private;
 167         struct dasd_diag_req *dreq;
 168         int rc;
 169
 170         device = cqr->startdev;
 171         if (cqr->retries < 0) {
 172                 DBF_DEV_EVENT(DBF_ERR, device, "DIAG start_IO: request %p "
 173                             "- no retry left)", cqr);
 174                 cqr->status = DASD_CQR_ERROR;
 175                 return -EIO;
 176         }
 177         private = device->private;
 178         dreq = cqr->data;
 179
 180         private->iob.dev_nr = private->dev_id.devno;
 181         private->iob.key = 0;
 182         private->iob.flags = DASD_DIAG_RWFLAG_ASYNC;
 183         private->iob.block_count = dreq->block_count;
 184         private->iob.interrupt_params = (addr_t) cqr;
 185         private->iob.bio_list = dreq->bio;
 186         private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT;
 187
 188         cqr->startclk = get_tod_clock();
 189         cqr->starttime = jiffies;
 190         cqr->retries--;
 191
 192         rc = dia250(&private->iob, RW_BIO);
 193         switch (rc) {
 194         case 0: /* Synchronous I/O finished successfully */
 195                 cqr->stopclk = get_tod_clock();
 196                 cqr->status = DASD_CQR_SUCCESS;
 197                 /* Indicate to calling function that only a dasd_schedule_bh()
 198                    and no timer is needed */
 199                 rc = -EACCES;
 200                 break;
 201         case 8: /* Asynchronous I/O was started */
 202                 cqr->status = DASD_CQR_IN_IO;
 203                 rc = 0;
 204                 break;
 205         default: /* Error condition */
 206                 cqr->status = DASD_CQR_QUEUED;
 207                 DBF_DEV_EVENT(DBF_WARNING, device, "dia250 returned rc=%d", rc);
 208                 dasd_diag_erp(device);
 209                 rc = -EIO;
 210                 break;
 211         }
 212         cqr->intrc = rc;
 213         return rc;
 214 }
 215
 216 /* Terminate given request at the device. */
 217 static int
 218 dasd_diag_term_IO(struct dasd_ccw_req * cqr)
 219 {
 220         struct dasd_device *device;
 221
 222         device = cqr->startdev;
 223         mdsk_term_io(device);
 224         mdsk_init_io(device, device->block->bp_block, 0, NULL);
 225         cqr->status = DASD_CQR_CLEAR_PENDING;
 226         cqr->stopclk = get_tod_clock();
 227         dasd_schedule_device_bh(device);
 228         return 0;
 229 }
 230
 231 /* Handle external interruption. */
 232 static void dasd_ext_handler(struct ext_code ext_code,
 233                              unsigned int param32, unsigned long param64)
 234 {
 235         struct dasd_ccw_req *cqr, *next;
 236         struct dasd_device *device;
 237         unsigned long expires;
 238         unsigned long flags;
 239         addr_t ip;
 240         int rc;
 241
 242         switch (ext_code.subcode >> 8) {
 243         case DASD_DIAG_CODE_31BIT:
 244                 ip = (addr_t) param32;
 245                 break;
 246         case DASD_DIAG_CODE_64BIT:
 247                 ip = (addr_t) param64;
 248                 break;
 249         default:
 250                 return;
 251         }
 252         inc_irq_stat(IRQEXT_DSD);
 253         if (!ip) {              /* no intparm: unsolicited interrupt */
 254                 DBF_EVENT(DBF_NOTICE, "%s", "caught unsolicited "
 255                               "interrupt");
 256                 return;
 257         }
 258         cqr = (struct dasd_ccw_req *) ip;
 259         device = (struct dasd_device *) cqr->startdev;
 260         if (strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
 261                 DBF_DEV_EVENT(DBF_WARNING, device,
 262                             " magic number of dasd_ccw_req 0x%08X doesn't"
 263                             " match discipline 0x%08X",
 264                             cqr->magic, *(int *) (&device->discipline->name));
 265                 return;
 266         }
 267
 268         /* get irq lock to modify request queue */
 269         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 270
 271         /* Check for a pending clear operation */
 272         if (cqr->status == DASD_CQR_CLEAR_PENDING) {
 273                 cqr->status = DASD_CQR_CLEARED;
 274                 dasd_device_clear_timer(device);
 275                 dasd_schedule_device_bh(device);
 276                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 277                 return;
 278         }
 279
 280         cqr->stopclk = get_tod_clock();
 281
 282         expires = 0;
 283         if ((ext_code.subcode & 0xff) == 0) {
 284                 cqr->status = DASD_CQR_SUCCESS;
 285                 /* Start first request on queue if possible -> fast_io. */
 286                 if (!list_empty(&device->ccw_queue)) {
 287                         next = list_entry(device->ccw_queue.next,
 288                                           struct dasd_ccw_req, devlist);
 289                         if (next->status == DASD_CQR_QUEUED) {
 290                                 rc = dasd_start_diag(next);
 291                                 if (rc == 0)
 292                                         expires = next->expires;
 293                         }
 294                 }
 295         } else {
 296                 cqr->status = DASD_CQR_QUEUED;
 297                 DBF_DEV_EVENT(DBF_DEBUG, device, "interrupt status for "
 298                               "request %p was %d (%d retries left)", cqr,
 299                               ext_code.subcode & 0xff, cqr->retries);
 300                 dasd_diag_erp(device);
 301         }
 302
 303         if (expires != 0)
 304                 dasd_device_set_timer(device, expires);
 305         else
 306                 dasd_device_clear_timer(device);
 307         dasd_schedule_device_bh(device);
 308
 309         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 310 }
 311
 312 /* Check whether device can be controlled by DIAG discipline. Return zero on
 313  * success, non-zero otherwise. */
 314 static int
 315 dasd_diag_check_device(struct dasd_device *device)
 316 {
 317         struct dasd_diag_private *private = device->private;
 318         struct dasd_diag_characteristics *rdc_data;
 319         struct vtoc_cms_label *label;
 320         struct dasd_block *block;
 321         struct dasd_diag_bio *bio;
 322         unsigned int sb, bsize;
 323         blocknum_t end_block;
 324         int rc;
 325
 326         if (private == NULL) {
 327                 private = kzalloc(sizeof(*private), GFP_KERNEL);
 328                 if (private == NULL) {
 329                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 330                                 "Allocating memory for private DASD data "
 331                                       "failed\n");
 332                         return -ENOMEM;
 333                 }
 334                 ccw_device_get_id(device->cdev, &private->dev_id);
 335                 device->private = private;
 336         }
 337         block = dasd_alloc_block();
 338         if (IS_ERR(block)) {
 339                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 340                             "could not allocate dasd block structure");
 341                 device->private = NULL;
 342                 kfree(private);
 343                 return PTR_ERR(block);
 344         }
 345         device->block = block;
 346         block->base = device;
 347
 348         /* Read Device Characteristics */
 349         rdc_data = &private->rdc_data;
 350         rdc_data->dev_nr = private->dev_id.devno;
 351         rdc_data->rdc_len = sizeof (struct dasd_diag_characteristics);
 352
 353         rc = diag210((struct diag210 *) rdc_data);
 354         if (rc) {
 355                 DBF_DEV_EVENT(DBF_WARNING, device, "failed to retrieve device "
 356                             "information (rc=%d)", rc);
 357                 rc = -EOPNOTSUPP;
 358                 goto out;
 359         }
 360
 361         device->default_expires = DIAG_TIMEOUT;
 362         device->default_retries = DIAG_MAX_RETRIES;
 363
 364         /* Figure out position of label block */
 365         switch (private->rdc_data.vdev_class) {
 366         case DEV_CLASS_FBA:
 367                 private->pt_block = 1;
 368                 break;
 369         case DEV_CLASS_ECKD:
 370                 private->pt_block = 2;
 371                 break;
 372         default:
 373                 pr_warn("%s: Device type %d is not supported in DIAG mode\n",
 374                         dev_name(&device->cdev->dev),
 375                         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         bio = kzalloc(sizeof(*bio), GFP_KERNEL);
 398         if (bio == NULL)  {
 399                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 400                               "No memory to allocate initialization bio");
 401                 rc = -ENOMEM;
 402                 goto out_label;
 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(*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_warn("%s: A 64-bit DIAG call failed\n",
 424                                 dev_name(&device->cdev->dev));
 425                         rc = -EOPNOTSUPP;
 426                         goto out_bio;
 427                 }
 428                 mdsk_term_io(device);
 429                 if (rc == 0)
 430                         break;
 431         }
 432         if (bsize > PAGE_SIZE) {
 433                 pr_warn("%s: Accessing the DASD failed because of an incorrect format (rc=%d)\n",
 434                         dev_name(&device->cdev->dev), rc);
 435                 rc = -EIO;
 436                 goto out_bio;
 437         }
 438         /* check for label block */
 439         if (memcmp(label->label_id, DASD_DIAG_CMS1,
 440                   sizeof(DASD_DIAG_CMS1)) == 0) {
 441                 /* get formatted blocksize from label block */
 442                 bsize = (unsigned int) label->block_size;
 443                 block->blocks = (unsigned long) label->block_count;
 444         } else
 445                 block->blocks = end_block;
 446         block->bp_block = bsize;
 447         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
 448         for (sb = 512; sb < bsize; sb = sb << 1)
 449                 block->s2b_shift++;
 450         rc = mdsk_init_io(device, block->bp_block, 0, NULL);
 451         if (rc && (rc != 4)) {
 452                 pr_warn("%s: DIAG initialization failed with rc=%d\n",
 453                         dev_name(&device->cdev->dev), rc);
 454                 rc = -EIO;
 455         } else {
 456                 if (rc == 4)
 457                         set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
 458                 pr_info("%s: New DASD with %ld byte/block, total size %ld "
 459                         "KB%s\n", dev_name(&device->cdev->dev),
 460                         (unsigned long) block->bp_block,
 461                         (unsigned long) (block->blocks <<
 462                                          block->s2b_shift) >> 1,
 463                         (rc == 4) ? ", read-only device" : "");
 464                 rc = 0;
 465         }
 466 out_bio:
 467         kfree(bio);
 468 out_label:
 469         free_page((long) label);
 470 out:
 471         if (rc) {
 472                 device->block = NULL;
 473                 dasd_free_block(block);
 474                 device->private = NULL;
 475                 kfree(private);
 476         }
 477         return rc;
 478 }
 479
 480 /* Fill in virtual disk geometry for device. Return zero on success, non-zero
 481  * otherwise. */
 482 static int
 483 dasd_diag_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
 484 {
 485         if (dasd_check_blocksize(block->bp_block) != 0)
 486                 return -EINVAL;
 487         geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
 488         geo->heads = 16;
 489         geo->sectors = 128 >> block->s2b_shift;
 490         return 0;
 491 }
 492
 493 static dasd_erp_fn_t
 494 dasd_diag_erp_action(struct dasd_ccw_req * cqr)
 495 {
 496         return dasd_default_erp_action;
 497 }
 498
 499 static dasd_erp_fn_t
 500 dasd_diag_erp_postaction(struct dasd_ccw_req * cqr)
 501 {
 502         return dasd_default_erp_postaction;
 503 }
 504
 505 /* Create DASD request from block device request. Return pointer to new
 506  * request on success, ERR_PTR otherwise. */
 507 static struct dasd_ccw_req *dasd_diag_build_cp(struct dasd_device *memdev,
 508                                                struct dasd_block *block,
 509                                                struct request *req)
 510 {
 511         struct dasd_ccw_req *cqr;
 512         struct dasd_diag_req *dreq;
 513         struct dasd_diag_bio *dbio;
 514         struct req_iterator iter;
 515         struct bio_vec bv;
 516         char *dst;
 517         unsigned int count;
 518         sector_t recid, first_rec, last_rec;
 519         unsigned int blksize, off;
 520         unsigned char rw_cmd;
 521
 522         if (rq_data_dir(req) == READ)
 523                 rw_cmd = MDSK_READ_REQ;
 524         else if (rq_data_dir(req) == WRITE)
 525                 rw_cmd = MDSK_WRITE_REQ;
 526         else
 527                 return ERR_PTR(-EINVAL);
 528         blksize = block->bp_block;
 529         /* Calculate record id of first and last block. */
 530         first_rec = blk_rq_pos(req) >> block->s2b_shift;
 531         last_rec =
 532                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
 533         /* Check struct bio and count the number of blocks for the request. */
 534         count = 0;
 535         rq_for_each_segment(bv, req, iter) {
 536                 if (bv.bv_len & (blksize - 1))
 537                         /* Fba can only do full blocks. */
 538                         return ERR_PTR(-EINVAL);
 539                 count += bv.bv_len >> (block->s2b_shift + 9);
 540         }
 541         /* Paranoia. */
 542         if (count != last_rec - first_rec + 1)
 543                 return ERR_PTR(-EINVAL);
 544         /* Build the request */
 545         cqr = dasd_smalloc_request(DASD_DIAG_MAGIC, 0, struct_size(dreq, bio, count),
 546                                    memdev, blk_mq_rq_to_pdu(req));
 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 = bvec_virt(&bv);
 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 = device->private;
 605
 606         info->label_block = (unsigned int) private->pt_block;
 607         info->FBA_layout = 1;
 608         info->format = DASD_FORMAT_LDL;
 609         info->characteristics_size = sizeof(private->rdc_data);
 610         memcpy(info->characteristics, &private->rdc_data,
 611                sizeof(private->rdc_data));
 612         info->confdata_size = 0;
 613         return 0;
 614 }
 615
 616 static void
 617 dasd_diag_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
 618                      struct irb *stat)
 619 {
 620         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 621                     "dump sense not available for DIAG data");
 622 }
 623
 624 /*
 625  * Initialize block layer request queue.
 626  */
 627 static void dasd_diag_setup_blk_queue(struct dasd_block *block)
 628 {
 629         unsigned int logical_block_size = block->bp_block;
 630         struct request_queue *q = block->request_queue;
 631         int max;
 632
 633         max = DIAG_MAX_BLOCKS << block->s2b_shift;
 634         blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
 635         q->limits.max_dev_sectors = max;
 636         blk_queue_logical_block_size(q, logical_block_size);
 637         blk_queue_max_hw_sectors(q, max);
 638         blk_queue_max_segments(q, USHRT_MAX);
 639         /* With page sized segments each segment can be translated into one idaw/tidaw */
 640         blk_queue_max_segment_size(q, PAGE_SIZE);
 641         blk_queue_segment_boundary(q, PAGE_SIZE - 1);
 642 }
 643
 644 static int dasd_diag_pe_handler(struct dasd_device *device,
 645                                 __u8 tbvpm, __u8 fcsecpm)
 646 {
 647         return dasd_generic_verify_path(device, tbvpm);
 648 }
 649
 650 static struct dasd_discipline dasd_diag_discipline = {
 651         .owner = THIS_MODULE,
 652         .name = "DIAG",
 653         .ebcname = "DIAG",
 654         .check_device = dasd_diag_check_device,
 655         .pe_handler = dasd_diag_pe_handler,
 656         .fill_geometry = dasd_diag_fill_geometry,
 657         .setup_blk_queue = dasd_diag_setup_blk_queue,
 658         .start_IO = dasd_start_diag,
 659         .term_IO = dasd_diag_term_IO,
 660         .handle_terminated_request = dasd_diag_handle_terminated_request,
 661         .erp_action = dasd_diag_erp_action,
 662         .erp_postaction = dasd_diag_erp_postaction,
 663         .build_cp = dasd_diag_build_cp,
 664         .free_cp = dasd_diag_free_cp,
 665         .dump_sense = dasd_diag_dump_sense,
 666         .fill_info = dasd_diag_fill_info,
 667 };
 668
 669 static int __init
 670 dasd_diag_init(void)
 671 {
 672         if (!MACHINE_IS_VM) {
 673                 pr_info("Discipline %s cannot be used without z/VM\n",
 674                         dasd_diag_discipline.name);
 675                 return -ENODEV;
 676         }
 677         ASCEBC(dasd_diag_discipline.ebcname, 4);
 678
 679         irq_subclass_register(IRQ_SUBCLASS_SERVICE_SIGNAL);
 680         register_external_irq(EXT_IRQ_CP_SERVICE, dasd_ext_handler);
 681         dasd_diag_discipline_pointer = &dasd_diag_discipline;
 682         return 0;
 683 }
 684
 685 static void __exit
 686 dasd_diag_cleanup(void)
 687 {
 688         unregister_external_irq(EXT_IRQ_CP_SERVICE, dasd_ext_handler);
 689         irq_subclass_unregister(IRQ_SUBCLASS_SERVICE_SIGNAL);
 690         dasd_diag_discipline_pointer = NULL;
 691 }
 692
 693 module_init(dasd_diag_init);
 694 module_exit(dasd_diag_cleanup);