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 <linux/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 36MODULE_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 49static struct dasd_discipline dasd_diag_discipline; 50 51struct 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 59struct dasd_diag_req { 60 unsigned int block_count; 61 struct dasd_diag_bio bio[]; 62}; 63 64static 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. */ 70static 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 92static 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. */ 102static inline int 103mdsk_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. */ 127static inline int 128mdsk_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. */ 142static void 143dasd_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. */ 162static int 163dasd_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. */ 217static int 218dasd_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. */ 232static 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. */ 314static int 315dasd_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 } 466out_bio: 467 kfree(bio); 468out_label: 469 free_page((long) label); 470out: 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. */ 482static int 483dasd_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 493static dasd_erp_fn_t 494dasd_diag_erp_action(struct dasd_ccw_req * cqr) 495{ 496 return dasd_default_erp_action; 497} 498 499static dasd_erp_fn_t 500dasd_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. */ 507static 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. */ 581static int 582dasd_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 591static 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. */ 600static int 601dasd_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 616static void 617dasd_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 */ 627static 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->gdp->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 blk_queue_dma_alignment(q, PAGE_SIZE - 1); 643} 644 645static int dasd_diag_pe_handler(struct dasd_device *device, 646 __u8 tbvpm, __u8 fcsecpm) 647{ 648 return dasd_generic_verify_path(device, tbvpm); 649} 650 651static struct dasd_discipline dasd_diag_discipline = { 652 .owner = THIS_MODULE, 653 .name = "DIAG", 654 .ebcname = "DIAG", 655 .check_device = dasd_diag_check_device, 656 .pe_handler = dasd_diag_pe_handler, 657 .fill_geometry = dasd_diag_fill_geometry, 658 .setup_blk_queue = dasd_diag_setup_blk_queue, 659 .start_IO = dasd_start_diag, 660 .term_IO = dasd_diag_term_IO, 661 .handle_terminated_request = dasd_diag_handle_terminated_request, 662 .erp_action = dasd_diag_erp_action, 663 .erp_postaction = dasd_diag_erp_postaction, 664 .build_cp = dasd_diag_build_cp, 665 .free_cp = dasd_diag_free_cp, 666 .dump_sense = dasd_diag_dump_sense, 667 .fill_info = dasd_diag_fill_info, 668}; 669 670static int __init 671dasd_diag_init(void) 672{ 673 if (!MACHINE_IS_VM) { 674 pr_info("Discipline %s cannot be used without z/VM\n", 675 dasd_diag_discipline.name); 676 return -ENODEV; 677 } 678 ASCEBC(dasd_diag_discipline.ebcname, 4); 679 680 irq_subclass_register(IRQ_SUBCLASS_SERVICE_SIGNAL); 681 register_external_irq(EXT_IRQ_CP_SERVICE, dasd_ext_handler); 682 dasd_diag_discipline_pointer = &dasd_diag_discipline; 683 return 0; 684} 685 686static void __exit 687dasd_diag_cleanup(void) 688{ 689 unregister_external_irq(EXT_IRQ_CP_SERVICE, dasd_ext_handler); 690 irq_subclass_unregister(IRQ_SUBCLASS_SERVICE_SIGNAL); 691 dasd_diag_discipline_pointer = NULL; 692} 693 694module_init(dasd_diag_init); 695module_exit(dasd_diag_cleanup); 696