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/todclk.h> 28 #include <asm/vtoc.h> 29 #include <asm/diag.h> 30 31 #include "dasd_int.h" 32 #include "dasd_diag.h" 33 34 #define PRINTK_HEADER "dasd(diag):" 35 36 MODULE_LICENSE("GPL"); 37 38 /* The maximum number of blocks per request (max_blocks) is dependent on the 39 * amount of storage that is available in the static I/O buffer for each 40 * device. Currently each device gets 2 pages. We want to fit two requests 41 * into the available memory so that we can immediately start the next if one 42 * finishes. */ 43 #define DIAG_MAX_BLOCKS (((2 * PAGE_SIZE - sizeof(struct dasd_ccw_req) - \ 44 sizeof(struct dasd_diag_req)) / \ 45 sizeof(struct dasd_diag_bio)) / 2) 46 #define DIAG_MAX_RETRIES 32 47 #define DIAG_TIMEOUT 50 * HZ 48 49 static struct dasd_discipline dasd_diag_discipline; 50 51 struct dasd_diag_private { 52 struct dasd_diag_characteristics rdc_data; 53 struct dasd_diag_rw_io iob; 54 struct dasd_diag_init_io iib; 55 blocknum_t pt_block; 56 struct ccw_dev_id dev_id; 57 }; 58 59 struct dasd_diag_req { 60 unsigned int block_count; 61 struct dasd_diag_bio bio[0]; 62 }; 63 64 static const u8 DASD_DIAG_CMS1[] = { 0xc3, 0xd4, 0xe2, 0xf1 };/* EBCDIC CMS1 */ 65 66 /* Perform DIAG250 call with block I/O parameter list iob (input and output) 67 * and function code cmd. 68 * In case of an exception return 3. Otherwise return result of bitwise OR of 69 * resulting condition code and DIAG return code. */ 70 static inline int dia250(void *iob, int cmd) 71 { 72 register unsigned long reg2 asm ("2") = (unsigned long) iob; 73 typedef union { 74 struct dasd_diag_init_io init_io; 75 struct dasd_diag_rw_io rw_io; 76 } addr_type; 77 int rc; 78 79 rc = 3; 80 asm volatile( 81 " diag 2,%2,0x250\n" 82 "0: ipm %0\n" 83 " srl %0,28\n" 84 " or %0,3\n" 85 "1:\n" 86 EX_TABLE(0b,1b) 87 : "+d" (rc), "=m" (*(addr_type *) iob) 88 : "d" (cmd), "d" (reg2), "m" (*(addr_type *) iob) 89 : "3", "cc"); 90 return rc; 91 } 92 93 /* Initialize block I/O to DIAG device using the specified blocksize and 94 * block offset. On success, return zero and set end_block to contain the 95 * number of blocks on the device minus the specified offset. Return non-zero 96 * otherwise. */ 97 static inline int 98 mdsk_init_io(struct dasd_device *device, unsigned int blocksize, 99 blocknum_t offset, blocknum_t *end_block) 100 { 101 struct dasd_diag_private *private; 102 struct dasd_diag_init_io *iib; 103 int rc; 104 105 private = (struct dasd_diag_private *) device->private; 106 iib = &private->iib; 107 memset(iib, 0, sizeof (struct dasd_diag_init_io)); 108 109 iib->dev_nr = private->dev_id.devno; 110 iib->block_size = blocksize; 111 iib->offset = offset; 112 iib->flaga = DASD_DIAG_FLAGA_DEFAULT; 113 114 rc = dia250(iib, INIT_BIO); 115 116 if ((rc & 3) == 0 && end_block) 117 *end_block = iib->end_block; 118 119 return rc; 120 } 121 122 /* Remove block I/O environment for device. Return zero on success, non-zero 123 * otherwise. */ 124 static inline int 125 mdsk_term_io(struct dasd_device * device) 126 { 127 struct dasd_diag_private *private; 128 struct dasd_diag_init_io *iib; 129 int rc; 130 131 private = (struct dasd_diag_private *) device->private; 132 iib = &private->iib; 133 memset(iib, 0, sizeof (struct dasd_diag_init_io)); 134 iib->dev_nr = private->dev_id.devno; 135 rc = dia250(iib, TERM_BIO); 136 return rc; 137 } 138 139 /* Error recovery for failed DIAG requests - try to reestablish the DIAG 140 * environment. */ 141 static void 142 dasd_diag_erp(struct dasd_device *device) 143 { 144 int rc; 145 146 mdsk_term_io(device); 147 rc = mdsk_init_io(device, device->block->bp_block, 0, NULL); 148 if (rc) 149 dev_warn(&device->cdev->dev, "DIAG ERP failed with " 150 "rc=%d\n", rc); 151 } 152 153 /* Start a given request at the device. Return zero on success, non-zero 154 * otherwise. */ 155 static int 156 dasd_start_diag(struct dasd_ccw_req * cqr) 157 { 158 struct dasd_device *device; 159 struct dasd_diag_private *private; 160 struct dasd_diag_req *dreq; 161 int rc; 162 163 device = cqr->startdev; 164 if (cqr->retries < 0) { 165 DBF_DEV_EVENT(DBF_ERR, device, "DIAG start_IO: request %p " 166 "- no retry left)", cqr); 167 cqr->status = DASD_CQR_ERROR; 168 return -EIO; 169 } 170 private = (struct dasd_diag_private *) device->private; 171 dreq = (struct dasd_diag_req *) cqr->data; 172 173 private->iob.dev_nr = private->dev_id.devno; 174 private->iob.key = 0; 175 private->iob.flags = DASD_DIAG_RWFLAG_ASYNC; 176 private->iob.block_count = dreq->block_count; 177 private->iob.interrupt_params = (addr_t) cqr; 178 private->iob.bio_list = dreq->bio; 179 private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT; 180 181 cqr->startclk = get_clock(); 182 cqr->starttime = jiffies; 183 cqr->retries--; 184 185 rc = dia250(&private->iob, RW_BIO); 186 switch (rc) { 187 case 0: /* Synchronous I/O finished successfully */ 188 cqr->stopclk = get_clock(); 189 cqr->status = DASD_CQR_SUCCESS; 190 /* Indicate to calling function that only a dasd_schedule_bh() 191 and no timer is needed */ 192 rc = -EACCES; 193 break; 194 case 8: /* Asynchronous I/O was started */ 195 cqr->status = DASD_CQR_IN_IO; 196 rc = 0; 197 break; 198 default: /* Error condition */ 199 cqr->status = DASD_CQR_QUEUED; 200 DBF_DEV_EVENT(DBF_WARNING, device, "dia250 returned rc=%d", rc); 201 dasd_diag_erp(device); 202 rc = -EIO; 203 break; 204 } 205 cqr->intrc = rc; 206 return rc; 207 } 208 209 /* Terminate given request at the device. */ 210 static int 211 dasd_diag_term_IO(struct dasd_ccw_req * cqr) 212 { 213 struct dasd_device *device; 214 215 device = cqr->startdev; 216 mdsk_term_io(device); 217 mdsk_init_io(device, device->block->bp_block, 0, NULL); 218 cqr->status = DASD_CQR_CLEAR_PENDING; 219 cqr->stopclk = get_clock(); 220 dasd_schedule_device_bh(device); 221 return 0; 222 } 223 224 /* Handle external interruption. */ 225 static void 226 dasd_ext_handler(__u16 code) 227 { 228 struct dasd_ccw_req *cqr, *next; 229 struct dasd_device *device; 230 unsigned long long expires; 231 unsigned long flags; 232 u8 int_code, status; 233 addr_t ip; 234 int rc; 235 236 int_code = *((u8 *) DASD_DIAG_LC_INT_CODE); 237 status = *((u8 *) DASD_DIAG_LC_INT_STATUS); 238 switch (int_code) { 239 case DASD_DIAG_CODE_31BIT: 240 ip = (addr_t) *((u32 *) DASD_DIAG_LC_INT_PARM_31BIT); 241 break; 242 case DASD_DIAG_CODE_64BIT: 243 ip = (addr_t) *((u64 *) DASD_DIAG_LC_INT_PARM_64BIT); 244 break; 245 default: 246 return; 247 } 248 if (!ip) { /* no intparm: unsolicited interrupt */ 249 DBF_EVENT(DBF_NOTICE, "%s", "caught unsolicited " 250 "interrupt"); 251 return; 252 } 253 cqr = (struct dasd_ccw_req *) ip; 254 device = (struct dasd_device *) cqr->startdev; 255 if (strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { 256 DBF_DEV_EVENT(DBF_WARNING, device, 257 " magic number of dasd_ccw_req 0x%08X doesn't" 258 " match discipline 0x%08X", 259 cqr->magic, *(int *) (&device->discipline->name)); 260 return; 261 } 262 263 /* get irq lock to modify request queue */ 264 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 265 266 /* Check for a pending clear operation */ 267 if (cqr->status == DASD_CQR_CLEAR_PENDING) { 268 cqr->status = DASD_CQR_CLEARED; 269 dasd_device_clear_timer(device); 270 dasd_schedule_device_bh(device); 271 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 272 return; 273 } 274 275 cqr->stopclk = get_clock(); 276 277 expires = 0; 278 if (status == 0) { 279 cqr->status = DASD_CQR_SUCCESS; 280 /* Start first request on queue if possible -> fast_io. */ 281 if (!list_empty(&device->ccw_queue)) { 282 next = list_entry(device->ccw_queue.next, 283 struct dasd_ccw_req, devlist); 284 if (next->status == DASD_CQR_QUEUED) { 285 rc = dasd_start_diag(next); 286 if (rc == 0) 287 expires = next->expires; 288 } 289 } 290 } else { 291 cqr->status = DASD_CQR_QUEUED; 292 DBF_DEV_EVENT(DBF_DEBUG, device, "interrupt status for " 293 "request %p was %d (%d retries left)", cqr, status, 294 cqr->retries); 295 dasd_diag_erp(device); 296 } 297 298 if (expires != 0) 299 dasd_device_set_timer(device, expires); 300 else 301 dasd_device_clear_timer(device); 302 dasd_schedule_device_bh(device); 303 304 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 305 } 306 307 /* Check whether device can be controlled by DIAG discipline. Return zero on 308 * success, non-zero otherwise. */ 309 static int 310 dasd_diag_check_device(struct dasd_device *device) 311 { 312 struct dasd_block *block; 313 struct dasd_diag_private *private; 314 struct dasd_diag_characteristics *rdc_data; 315 struct dasd_diag_bio bio; 316 struct vtoc_cms_label *label; 317 blocknum_t end_block; 318 unsigned int sb, bsize; 319 int rc; 320 321 private = (struct dasd_diag_private *) device->private; 322 if (private == NULL) { 323 private = kzalloc(sizeof(struct dasd_diag_private),GFP_KERNEL); 324 if (private == NULL) { 325 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 326 "Allocating memory for private DASD data " 327 "failed\n"); 328 return -ENOMEM; 329 } 330 ccw_device_get_id(device->cdev, &private->dev_id); 331 device->private = (void *) private; 332 } 333 block = dasd_alloc_block(); 334 if (IS_ERR(block)) { 335 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 336 "could not allocate dasd block structure"); 337 device->private = NULL; 338 kfree(private); 339 return PTR_ERR(block); 340 } 341 device->block = block; 342 block->base = device; 343 344 /* Read Device Characteristics */ 345 rdc_data = (void *) &(private->rdc_data); 346 rdc_data->dev_nr = private->dev_id.devno; 347 rdc_data->rdc_len = sizeof (struct dasd_diag_characteristics); 348 349 rc = diag210((struct diag210 *) rdc_data); 350 if (rc) { 351 DBF_DEV_EVENT(DBF_WARNING, device, "failed to retrieve device " 352 "information (rc=%d)", rc); 353 rc = -EOPNOTSUPP; 354 goto out; 355 } 356 357 /* Figure out position of label block */ 358 switch (private->rdc_data.vdev_class) { 359 case DEV_CLASS_FBA: 360 private->pt_block = 1; 361 break; 362 case DEV_CLASS_ECKD: 363 private->pt_block = 2; 364 break; 365 default: 366 dev_warn(&device->cdev->dev, "Device type %d is not supported " 367 "in DIAG mode\n", private->rdc_data.vdev_class); 368 rc = -EOPNOTSUPP; 369 goto out; 370 } 371 372 DBF_DEV_EVENT(DBF_INFO, device, 373 "%04X: %04X on real %04X/%02X", 374 rdc_data->dev_nr, 375 rdc_data->vdev_type, 376 rdc_data->rdev_type, rdc_data->rdev_model); 377 378 /* terminate all outstanding operations */ 379 mdsk_term_io(device); 380 381 /* figure out blocksize of device */ 382 label = (struct vtoc_cms_label *) get_zeroed_page(GFP_KERNEL); 383 if (label == NULL) { 384 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 385 "No memory to allocate initialization request"); 386 rc = -ENOMEM; 387 goto out; 388 } 389 rc = 0; 390 end_block = 0; 391 /* try all sizes - needed for ECKD devices */ 392 for (bsize = 512; bsize <= PAGE_SIZE; bsize <<= 1) { 393 mdsk_init_io(device, bsize, 0, &end_block); 394 memset(&bio, 0, sizeof (struct dasd_diag_bio)); 395 bio.type = MDSK_READ_REQ; 396 bio.block_number = private->pt_block + 1; 397 bio.buffer = label; 398 memset(&private->iob, 0, sizeof (struct dasd_diag_rw_io)); 399 private->iob.dev_nr = rdc_data->dev_nr; 400 private->iob.key = 0; 401 private->iob.flags = 0; /* do synchronous io */ 402 private->iob.block_count = 1; 403 private->iob.interrupt_params = 0; 404 private->iob.bio_list = &bio; 405 private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT; 406 rc = dia250(&private->iob, RW_BIO); 407 if (rc == 3) { 408 dev_warn(&device->cdev->dev, 409 "A 64-bit DIAG call failed\n"); 410 rc = -EOPNOTSUPP; 411 goto out_label; 412 } 413 mdsk_term_io(device); 414 if (rc == 0) 415 break; 416 } 417 if (bsize > PAGE_SIZE) { 418 dev_warn(&device->cdev->dev, "Accessing the DASD failed because" 419 " of an incorrect format (rc=%d)\n", rc); 420 rc = -EIO; 421 goto out_label; 422 } 423 /* check for label block */ 424 if (memcmp(label->label_id, DASD_DIAG_CMS1, 425 sizeof(DASD_DIAG_CMS1)) == 0) { 426 /* get formatted blocksize from label block */ 427 bsize = (unsigned int) label->block_size; 428 block->blocks = (unsigned long) label->block_count; 429 } else 430 block->blocks = end_block; 431 block->bp_block = bsize; 432 block->s2b_shift = 0; /* bits to shift 512 to get a block */ 433 for (sb = 512; sb < bsize; sb = sb << 1) 434 block->s2b_shift++; 435 rc = mdsk_init_io(device, block->bp_block, 0, NULL); 436 if (rc) { 437 dev_warn(&device->cdev->dev, "DIAG initialization " 438 "failed with rc=%d\n", rc); 439 rc = -EIO; 440 } else { 441 dev_info(&device->cdev->dev, 442 "New DASD with %ld byte/block, total size %ld KB\n", 443 (unsigned long) block->bp_block, 444 (unsigned long) (block->blocks << 445 block->s2b_shift) >> 1); 446 } 447 out_label: 448 free_page((long) label); 449 out: 450 if (rc) { 451 device->block = NULL; 452 dasd_free_block(block); 453 device->private = NULL; 454 kfree(private); 455 } 456 return rc; 457 } 458 459 /* Fill in virtual disk geometry for device. Return zero on success, non-zero 460 * otherwise. */ 461 static int 462 dasd_diag_fill_geometry(struct dasd_block *block, struct hd_geometry *geo) 463 { 464 if (dasd_check_blocksize(block->bp_block) != 0) 465 return -EINVAL; 466 geo->cylinders = (block->blocks << block->s2b_shift) >> 10; 467 geo->heads = 16; 468 geo->sectors = 128 >> block->s2b_shift; 469 return 0; 470 } 471 472 static dasd_erp_fn_t 473 dasd_diag_erp_action(struct dasd_ccw_req * cqr) 474 { 475 return dasd_default_erp_action; 476 } 477 478 static dasd_erp_fn_t 479 dasd_diag_erp_postaction(struct dasd_ccw_req * cqr) 480 { 481 return dasd_default_erp_postaction; 482 } 483 484 /* Create DASD request from block device request. Return pointer to new 485 * request on success, ERR_PTR otherwise. */ 486 static struct dasd_ccw_req *dasd_diag_build_cp(struct dasd_device *memdev, 487 struct dasd_block *block, 488 struct request *req) 489 { 490 struct dasd_ccw_req *cqr; 491 struct dasd_diag_req *dreq; 492 struct dasd_diag_bio *dbio; 493 struct req_iterator iter; 494 struct bio_vec *bv; 495 char *dst; 496 unsigned int count, datasize; 497 sector_t recid, first_rec, last_rec; 498 unsigned int blksize, off; 499 unsigned char rw_cmd; 500 501 if (rq_data_dir(req) == READ) 502 rw_cmd = MDSK_READ_REQ; 503 else if (rq_data_dir(req) == WRITE) 504 rw_cmd = MDSK_WRITE_REQ; 505 else 506 return ERR_PTR(-EINVAL); 507 blksize = block->bp_block; 508 /* Calculate record id of first and last block. */ 509 first_rec = blk_rq_pos(req) >> block->s2b_shift; 510 last_rec = 511 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift; 512 /* Check struct bio and count the number of blocks for the request. */ 513 count = 0; 514 rq_for_each_segment(bv, req, iter) { 515 if (bv->bv_len & (blksize - 1)) 516 /* Fba can only do full blocks. */ 517 return ERR_PTR(-EINVAL); 518 count += bv->bv_len >> (block->s2b_shift + 9); 519 } 520 /* Paranoia. */ 521 if (count != last_rec - first_rec + 1) 522 return ERR_PTR(-EINVAL); 523 /* Build the request */ 524 datasize = sizeof(struct dasd_diag_req) + 525 count*sizeof(struct dasd_diag_bio); 526 cqr = dasd_smalloc_request(dasd_diag_discipline.name, 0, 527 datasize, memdev); 528 if (IS_ERR(cqr)) 529 return cqr; 530 531 dreq = (struct dasd_diag_req *) cqr->data; 532 dreq->block_count = count; 533 dbio = dreq->bio; 534 recid = first_rec; 535 rq_for_each_segment(bv, req, iter) { 536 dst = page_address(bv->bv_page) + bv->bv_offset; 537 for (off = 0; off < bv->bv_len; off += blksize) { 538 memset(dbio, 0, sizeof (struct dasd_diag_bio)); 539 dbio->type = rw_cmd; 540 dbio->block_number = recid + 1; 541 dbio->buffer = dst; 542 dbio++; 543 dst += blksize; 544 recid++; 545 } 546 } 547 cqr->retries = DIAG_MAX_RETRIES; 548 cqr->buildclk = get_clock(); 549 if (blk_noretry_request(req) || 550 block->base->features & DASD_FEATURE_FAILFAST) 551 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); 552 cqr->startdev = memdev; 553 cqr->memdev = memdev; 554 cqr->block = block; 555 cqr->expires = DIAG_TIMEOUT; 556 cqr->status = DASD_CQR_FILLED; 557 return cqr; 558 } 559 560 /* Release DASD request. Return non-zero if request was successful, zero 561 * otherwise. */ 562 static int 563 dasd_diag_free_cp(struct dasd_ccw_req *cqr, struct request *req) 564 { 565 int status; 566 567 status = cqr->status == DASD_CQR_DONE; 568 dasd_sfree_request(cqr, cqr->memdev); 569 return status; 570 } 571 572 static void dasd_diag_handle_terminated_request(struct dasd_ccw_req *cqr) 573 { 574 cqr->status = DASD_CQR_FILLED; 575 }; 576 577 /* Fill in IOCTL data for device. */ 578 static int 579 dasd_diag_fill_info(struct dasd_device * device, 580 struct dasd_information2_t * info) 581 { 582 struct dasd_diag_private *private; 583 584 private = (struct dasd_diag_private *) device->private; 585 info->label_block = (unsigned int) private->pt_block; 586 info->FBA_layout = 1; 587 info->format = DASD_FORMAT_LDL; 588 info->characteristics_size = sizeof (struct dasd_diag_characteristics); 589 memcpy(info->characteristics, 590 &((struct dasd_diag_private *) device->private)->rdc_data, 591 sizeof (struct dasd_diag_characteristics)); 592 info->confdata_size = 0; 593 return 0; 594 } 595 596 static void 597 dasd_diag_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req, 598 struct irb *stat) 599 { 600 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 601 "dump sense not available for DIAG data"); 602 } 603 604 static struct dasd_discipline dasd_diag_discipline = { 605 .owner = THIS_MODULE, 606 .name = "DIAG", 607 .ebcname = "DIAG", 608 .max_blocks = DIAG_MAX_BLOCKS, 609 .check_device = dasd_diag_check_device, 610 .fill_geometry = dasd_diag_fill_geometry, 611 .start_IO = dasd_start_diag, 612 .term_IO = dasd_diag_term_IO, 613 .handle_terminated_request = dasd_diag_handle_terminated_request, 614 .erp_action = dasd_diag_erp_action, 615 .erp_postaction = dasd_diag_erp_postaction, 616 .build_cp = dasd_diag_build_cp, 617 .free_cp = dasd_diag_free_cp, 618 .dump_sense = dasd_diag_dump_sense, 619 .fill_info = dasd_diag_fill_info, 620 }; 621 622 static int __init 623 dasd_diag_init(void) 624 { 625 if (!MACHINE_IS_VM) { 626 pr_info("Discipline %s cannot be used without z/VM\n", 627 dasd_diag_discipline.name); 628 return -ENODEV; 629 } 630 ASCEBC(dasd_diag_discipline.ebcname, 4); 631 632 ctl_set_bit(0, 9); 633 register_external_interrupt(0x2603, dasd_ext_handler); 634 dasd_diag_discipline_pointer = &dasd_diag_discipline; 635 return 0; 636 } 637 638 static void __exit 639 dasd_diag_cleanup(void) 640 { 641 unregister_external_interrupt(0x2603, dasd_ext_handler); 642 ctl_clear_bit(0, 9); 643 dasd_diag_discipline_pointer = NULL; 644 } 645 646 module_init(dasd_diag_init); 647 module_exit(dasd_diag_cleanup); 648