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 #include <linux/stddef.h> 12 #include <linux/kernel.h> 13 #include <linux/slab.h> 14 #include <linux/hdreg.h> 15 #include <linux/bio.h> 16 #include <linux/module.h> 17 #include <linux/init.h> 18 #include <linux/jiffies.h> 19 20 #include <asm/dasd.h> 21 #include <asm/debug.h> 22 #include <asm/ebcdic.h> 23 #include <asm/io.h> 24 #include <asm/s390_ext.h> 25 #include <asm/todclk.h> 26 #include <asm/vtoc.h> 27 #include <asm/diag.h> 28 29 #include "dasd_int.h" 30 #include "dasd_diag.h" 31 32 #define PRINTK_HEADER "dasd(diag):" 33 34 MODULE_LICENSE("GPL"); 35 36 /* The maximum number of blocks per request (max_blocks) is dependent on the 37 * amount of storage that is available in the static I/O buffer for each 38 * device. Currently each device gets 2 pages. We want to fit two requests 39 * into the available memory so that we can immediately start the next if one 40 * finishes. */ 41 #define DIAG_MAX_BLOCKS (((2 * PAGE_SIZE - sizeof(struct dasd_ccw_req) - \ 42 sizeof(struct dasd_diag_req)) / \ 43 sizeof(struct dasd_diag_bio)) / 2) 44 #define DIAG_MAX_RETRIES 32 45 #define DIAG_TIMEOUT 50 * HZ 46 47 static struct dasd_discipline dasd_diag_discipline; 48 49 struct dasd_diag_private { 50 struct dasd_diag_characteristics rdc_data; 51 struct dasd_diag_rw_io iob; 52 struct dasd_diag_init_io iib; 53 blocknum_t pt_block; 54 struct ccw_dev_id dev_id; 55 }; 56 57 struct dasd_diag_req { 58 unsigned int block_count; 59 struct dasd_diag_bio bio[0]; 60 }; 61 62 static const u8 DASD_DIAG_CMS1[] = { 0xc3, 0xd4, 0xe2, 0xf1 };/* EBCDIC CMS1 */ 63 64 /* Perform DIAG250 call with block I/O parameter list iob (input and output) 65 * and function code cmd. 66 * In case of an exception return 3. Otherwise return result of bitwise OR of 67 * resulting condition code and DIAG return code. */ 68 static inline int dia250(void *iob, int cmd) 69 { 70 register unsigned long reg2 asm ("2") = (unsigned long) iob; 71 typedef union { 72 struct dasd_diag_init_io init_io; 73 struct dasd_diag_rw_io rw_io; 74 } addr_type; 75 int rc; 76 77 rc = 3; 78 asm volatile( 79 " diag 2,%2,0x250\n" 80 "0: ipm %0\n" 81 " srl %0,28\n" 82 " or %0,3\n" 83 "1:\n" 84 EX_TABLE(0b,1b) 85 : "+d" (rc), "=m" (*(addr_type *) iob) 86 : "d" (cmd), "d" (reg2), "m" (*(addr_type *) iob) 87 : "3", "cc"); 88 return rc; 89 } 90 91 /* Initialize block I/O to DIAG device using the specified blocksize and 92 * block offset. On success, return zero and set end_block to contain the 93 * number of blocks on the device minus the specified offset. Return non-zero 94 * otherwise. */ 95 static inline int 96 mdsk_init_io(struct dasd_device *device, unsigned int blocksize, 97 blocknum_t offset, blocknum_t *end_block) 98 { 99 struct dasd_diag_private *private; 100 struct dasd_diag_init_io *iib; 101 int rc; 102 103 private = (struct dasd_diag_private *) device->private; 104 iib = &private->iib; 105 memset(iib, 0, sizeof (struct dasd_diag_init_io)); 106 107 iib->dev_nr = private->dev_id.devno; 108 iib->block_size = blocksize; 109 iib->offset = offset; 110 iib->flaga = DASD_DIAG_FLAGA_DEFAULT; 111 112 rc = dia250(iib, INIT_BIO); 113 114 if ((rc & 3) == 0 && end_block) 115 *end_block = iib->end_block; 116 117 return rc; 118 } 119 120 /* Remove block I/O environment for device. Return zero on success, non-zero 121 * otherwise. */ 122 static inline int 123 mdsk_term_io(struct dasd_device * device) 124 { 125 struct dasd_diag_private *private; 126 struct dasd_diag_init_io *iib; 127 int rc; 128 129 private = (struct dasd_diag_private *) device->private; 130 iib = &private->iib; 131 memset(iib, 0, sizeof (struct dasd_diag_init_io)); 132 iib->dev_nr = private->dev_id.devno; 133 rc = dia250(iib, TERM_BIO); 134 return rc; 135 } 136 137 /* Error recovery for failed DIAG requests - try to reestablish the DIAG 138 * environment. */ 139 static void 140 dasd_diag_erp(struct dasd_device *device) 141 { 142 int rc; 143 144 mdsk_term_io(device); 145 rc = mdsk_init_io(device, device->block->bp_block, 0, NULL); 146 if (rc) 147 DEV_MESSAGE(KERN_WARNING, device, "DIAG ERP unsuccessful, " 148 "rc=%d", rc); 149 } 150 151 /* Start a given request at the device. Return zero on success, non-zero 152 * otherwise. */ 153 static int 154 dasd_start_diag(struct dasd_ccw_req * cqr) 155 { 156 struct dasd_device *device; 157 struct dasd_diag_private *private; 158 struct dasd_diag_req *dreq; 159 int rc; 160 161 device = cqr->startdev; 162 if (cqr->retries < 0) { 163 DEV_MESSAGE(KERN_WARNING, device, "DIAG start_IO: request %p " 164 "- no retry left)", cqr); 165 cqr->status = DASD_CQR_ERROR; 166 return -EIO; 167 } 168 private = (struct dasd_diag_private *) device->private; 169 dreq = (struct dasd_diag_req *) cqr->data; 170 171 private->iob.dev_nr = private->dev_id.devno; 172 private->iob.key = 0; 173 private->iob.flags = DASD_DIAG_RWFLAG_ASYNC; 174 private->iob.block_count = dreq->block_count; 175 private->iob.interrupt_params = (addr_t) cqr; 176 private->iob.bio_list = dreq->bio; 177 private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT; 178 179 cqr->startclk = get_clock(); 180 cqr->starttime = jiffies; 181 cqr->retries--; 182 183 rc = dia250(&private->iob, RW_BIO); 184 switch (rc) { 185 case 0: /* Synchronous I/O finished successfully */ 186 cqr->stopclk = get_clock(); 187 cqr->status = DASD_CQR_SUCCESS; 188 /* Indicate to calling function that only a dasd_schedule_bh() 189 and no timer is needed */ 190 rc = -EACCES; 191 break; 192 case 8: /* Asynchronous I/O was started */ 193 cqr->status = DASD_CQR_IN_IO; 194 rc = 0; 195 break; 196 default: /* Error condition */ 197 cqr->status = DASD_CQR_QUEUED; 198 DEV_MESSAGE(KERN_WARNING, device, "dia250 returned rc=%d", rc); 199 dasd_diag_erp(device); 200 rc = -EIO; 201 break; 202 } 203 return rc; 204 } 205 206 /* Terminate given request at the device. */ 207 static int 208 dasd_diag_term_IO(struct dasd_ccw_req * cqr) 209 { 210 struct dasd_device *device; 211 212 device = cqr->startdev; 213 mdsk_term_io(device); 214 mdsk_init_io(device, device->block->bp_block, 0, NULL); 215 cqr->status = DASD_CQR_CLEAR_PENDING; 216 cqr->stopclk = get_clock(); 217 dasd_schedule_device_bh(device); 218 return 0; 219 } 220 221 /* Handle external interruption. */ 222 static void 223 dasd_ext_handler(__u16 code) 224 { 225 struct dasd_ccw_req *cqr, *next; 226 struct dasd_device *device; 227 unsigned long long expires; 228 unsigned long flags; 229 u8 int_code, status; 230 addr_t ip; 231 int rc; 232 233 int_code = *((u8 *) DASD_DIAG_LC_INT_CODE); 234 status = *((u8 *) DASD_DIAG_LC_INT_STATUS); 235 switch (int_code) { 236 case DASD_DIAG_CODE_31BIT: 237 ip = (addr_t) *((u32 *) DASD_DIAG_LC_INT_PARM_31BIT); 238 break; 239 case DASD_DIAG_CODE_64BIT: 240 ip = (addr_t) *((u64 *) DASD_DIAG_LC_INT_PARM_64BIT); 241 break; 242 default: 243 return; 244 } 245 if (!ip) { /* no intparm: unsolicited interrupt */ 246 MESSAGE(KERN_DEBUG, "%s", "caught unsolicited interrupt"); 247 return; 248 } 249 cqr = (struct dasd_ccw_req *) ip; 250 device = (struct dasd_device *) cqr->startdev; 251 if (strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { 252 DEV_MESSAGE(KERN_WARNING, device, 253 " magic number of dasd_ccw_req 0x%08X doesn't" 254 " match discipline 0x%08X", 255 cqr->magic, *(int *) (&device->discipline->name)); 256 return; 257 } 258 259 /* get irq lock to modify request queue */ 260 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 261 262 /* Check for a pending clear operation */ 263 if (cqr->status == DASD_CQR_CLEAR_PENDING) { 264 cqr->status = DASD_CQR_CLEARED; 265 dasd_device_clear_timer(device); 266 dasd_schedule_device_bh(device); 267 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 268 return; 269 } 270 271 cqr->stopclk = get_clock(); 272 273 expires = 0; 274 if (status == 0) { 275 cqr->status = DASD_CQR_SUCCESS; 276 /* Start first request on queue if possible -> fast_io. */ 277 if (!list_empty(&device->ccw_queue)) { 278 next = list_entry(device->ccw_queue.next, 279 struct dasd_ccw_req, devlist); 280 if (next->status == DASD_CQR_QUEUED) { 281 rc = dasd_start_diag(next); 282 if (rc == 0) 283 expires = next->expires; 284 else if (rc != -EACCES) 285 DEV_MESSAGE(KERN_WARNING, device, "%s", 286 "Interrupt fastpath " 287 "failed!"); 288 } 289 } 290 } else { 291 cqr->status = DASD_CQR_QUEUED; 292 DEV_MESSAGE(KERN_WARNING, 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 DEV_MESSAGE(KERN_WARNING, device, "%s", 326 "memory allocation failed for private data"); 327 return -ENOMEM; 328 } 329 ccw_device_get_id(device->cdev, &private->dev_id); 330 device->private = (void *) private; 331 } 332 block = dasd_alloc_block(); 333 if (IS_ERR(block)) { 334 DEV_MESSAGE(KERN_WARNING, device, "%s", 335 "could not allocate dasd block structure"); 336 device->private = NULL; 337 kfree(private); 338 return PTR_ERR(block); 339 } 340 device->block = block; 341 block->base = device; 342 343 /* Read Device Characteristics */ 344 rdc_data = (void *) &(private->rdc_data); 345 rdc_data->dev_nr = private->dev_id.devno; 346 rdc_data->rdc_len = sizeof (struct dasd_diag_characteristics); 347 348 rc = diag210((struct diag210 *) rdc_data); 349 if (rc) { 350 DEV_MESSAGE(KERN_WARNING, device, "failed to retrieve device " 351 "information (rc=%d)", rc); 352 rc = -EOPNOTSUPP; 353 goto out; 354 } 355 356 /* Figure out position of label block */ 357 switch (private->rdc_data.vdev_class) { 358 case DEV_CLASS_FBA: 359 private->pt_block = 1; 360 break; 361 case DEV_CLASS_ECKD: 362 private->pt_block = 2; 363 break; 364 default: 365 DEV_MESSAGE(KERN_WARNING, device, "unsupported device class " 366 "(class=%d)", private->rdc_data.vdev_class); 367 rc = -EOPNOTSUPP; 368 goto out; 369 } 370 371 DBF_DEV_EVENT(DBF_INFO, device, 372 "%04X: %04X on real %04X/%02X", 373 rdc_data->dev_nr, 374 rdc_data->vdev_type, 375 rdc_data->rdev_type, rdc_data->rdev_model); 376 377 /* terminate all outstanding operations */ 378 mdsk_term_io(device); 379 380 /* figure out blocksize of device */ 381 label = (struct vtoc_cms_label *) get_zeroed_page(GFP_KERNEL); 382 if (label == NULL) { 383 DEV_MESSAGE(KERN_WARNING, device, "%s", 384 "No memory to allocate initialization request"); 385 rc = -ENOMEM; 386 goto out; 387 } 388 rc = 0; 389 end_block = 0; 390 /* try all sizes - needed for ECKD devices */ 391 for (bsize = 512; bsize <= PAGE_SIZE; bsize <<= 1) { 392 mdsk_init_io(device, bsize, 0, &end_block); 393 memset(&bio, 0, sizeof (struct dasd_diag_bio)); 394 bio.type = MDSK_READ_REQ; 395 bio.block_number = private->pt_block + 1; 396 bio.buffer = label; 397 memset(&private->iob, 0, sizeof (struct dasd_diag_rw_io)); 398 private->iob.dev_nr = rdc_data->dev_nr; 399 private->iob.key = 0; 400 private->iob.flags = 0; /* do synchronous io */ 401 private->iob.block_count = 1; 402 private->iob.interrupt_params = 0; 403 private->iob.bio_list = &bio; 404 private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT; 405 rc = dia250(&private->iob, RW_BIO); 406 if (rc == 3) { 407 DEV_MESSAGE(KERN_WARNING, device, "%s", 408 "DIAG call failed"); 409 rc = -EOPNOTSUPP; 410 goto out_label; 411 } 412 mdsk_term_io(device); 413 if (rc == 0) 414 break; 415 } 416 if (bsize > PAGE_SIZE) { 417 DEV_MESSAGE(KERN_WARNING, device, "device access failed " 418 "(rc=%d)", rc); 419 rc = -EIO; 420 goto out_label; 421 } 422 /* check for label block */ 423 if (memcmp(label->label_id, DASD_DIAG_CMS1, 424 sizeof(DASD_DIAG_CMS1)) == 0) { 425 /* get formatted blocksize from label block */ 426 bsize = (unsigned int) label->block_size; 427 block->blocks = (unsigned long) label->block_count; 428 } else 429 block->blocks = end_block; 430 block->bp_block = bsize; 431 block->s2b_shift = 0; /* bits to shift 512 to get a block */ 432 for (sb = 512; sb < bsize; sb = sb << 1) 433 block->s2b_shift++; 434 rc = mdsk_init_io(device, block->bp_block, 0, NULL); 435 if (rc) { 436 DEV_MESSAGE(KERN_WARNING, device, "DIAG initialization " 437 "failed (rc=%d)", rc); 438 rc = -EIO; 439 } else { 440 DEV_MESSAGE(KERN_INFO, device, 441 "(%ld B/blk): %ldkB", 442 (unsigned long) block->bp_block, 443 (unsigned long) (block->blocks << 444 block->s2b_shift) >> 1); 445 } 446 out_label: 447 free_page((long) label); 448 out: 449 if (rc) { 450 device->block = NULL; 451 dasd_free_block(block); 452 device->private = NULL; 453 kfree(private); 454 } 455 return rc; 456 } 457 458 /* Fill in virtual disk geometry for device. Return zero on success, non-zero 459 * otherwise. */ 460 static int 461 dasd_diag_fill_geometry(struct dasd_block *block, struct hd_geometry *geo) 462 { 463 if (dasd_check_blocksize(block->bp_block) != 0) 464 return -EINVAL; 465 geo->cylinders = (block->blocks << block->s2b_shift) >> 10; 466 geo->heads = 16; 467 geo->sectors = 128 >> block->s2b_shift; 468 return 0; 469 } 470 471 static dasd_erp_fn_t 472 dasd_diag_erp_action(struct dasd_ccw_req * cqr) 473 { 474 return dasd_default_erp_action; 475 } 476 477 static dasd_erp_fn_t 478 dasd_diag_erp_postaction(struct dasd_ccw_req * cqr) 479 { 480 return dasd_default_erp_postaction; 481 } 482 483 /* Create DASD request from block device request. Return pointer to new 484 * request on success, ERR_PTR otherwise. */ 485 static struct dasd_ccw_req *dasd_diag_build_cp(struct dasd_device *memdev, 486 struct dasd_block *block, 487 struct request *req) 488 { 489 struct dasd_ccw_req *cqr; 490 struct dasd_diag_req *dreq; 491 struct dasd_diag_bio *dbio; 492 struct req_iterator iter; 493 struct bio_vec *bv; 494 char *dst; 495 unsigned int count, datasize; 496 sector_t recid, first_rec, last_rec; 497 unsigned int blksize, off; 498 unsigned char rw_cmd; 499 500 if (rq_data_dir(req) == READ) 501 rw_cmd = MDSK_READ_REQ; 502 else if (rq_data_dir(req) == WRITE) 503 rw_cmd = MDSK_WRITE_REQ; 504 else 505 return ERR_PTR(-EINVAL); 506 blksize = block->bp_block; 507 /* Calculate record id of first and last block. */ 508 first_rec = req->sector >> block->s2b_shift; 509 last_rec = (req->sector + req->nr_sectors - 1) >> block->s2b_shift; 510 /* Check struct bio and count the number of blocks for the request. */ 511 count = 0; 512 rq_for_each_segment(bv, req, iter) { 513 if (bv->bv_len & (blksize - 1)) 514 /* Fba can only do full blocks. */ 515 return ERR_PTR(-EINVAL); 516 count += bv->bv_len >> (block->s2b_shift + 9); 517 } 518 /* Paranoia. */ 519 if (count != last_rec - first_rec + 1) 520 return ERR_PTR(-EINVAL); 521 /* Build the request */ 522 datasize = sizeof(struct dasd_diag_req) + 523 count*sizeof(struct dasd_diag_bio); 524 cqr = dasd_smalloc_request(dasd_diag_discipline.name, 0, 525 datasize, memdev); 526 if (IS_ERR(cqr)) 527 return cqr; 528 529 dreq = (struct dasd_diag_req *) cqr->data; 530 dreq->block_count = count; 531 dbio = dreq->bio; 532 recid = first_rec; 533 rq_for_each_segment(bv, req, iter) { 534 dst = page_address(bv->bv_page) + bv->bv_offset; 535 for (off = 0; off < bv->bv_len; off += blksize) { 536 memset(dbio, 0, sizeof (struct dasd_diag_bio)); 537 dbio->type = rw_cmd; 538 dbio->block_number = recid + 1; 539 dbio->buffer = dst; 540 dbio++; 541 dst += blksize; 542 recid++; 543 } 544 } 545 cqr->retries = DIAG_MAX_RETRIES; 546 cqr->buildclk = get_clock(); 547 if (req->cmd_flags & REQ_FAILFAST) 548 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); 549 cqr->startdev = memdev; 550 cqr->memdev = memdev; 551 cqr->block = block; 552 cqr->expires = DIAG_TIMEOUT; 553 cqr->status = DASD_CQR_FILLED; 554 return cqr; 555 } 556 557 /* Release DASD request. Return non-zero if request was successful, zero 558 * otherwise. */ 559 static int 560 dasd_diag_free_cp(struct dasd_ccw_req *cqr, struct request *req) 561 { 562 int status; 563 564 status = cqr->status == DASD_CQR_DONE; 565 dasd_sfree_request(cqr, cqr->memdev); 566 return status; 567 } 568 569 static void dasd_diag_handle_terminated_request(struct dasd_ccw_req *cqr) 570 { 571 cqr->status = DASD_CQR_FILLED; 572 }; 573 574 /* Fill in IOCTL data for device. */ 575 static int 576 dasd_diag_fill_info(struct dasd_device * device, 577 struct dasd_information2_t * info) 578 { 579 struct dasd_diag_private *private; 580 581 private = (struct dasd_diag_private *) device->private; 582 info->label_block = (unsigned int) private->pt_block; 583 info->FBA_layout = 1; 584 info->format = DASD_FORMAT_LDL; 585 info->characteristics_size = sizeof (struct dasd_diag_characteristics); 586 memcpy(info->characteristics, 587 &((struct dasd_diag_private *) device->private)->rdc_data, 588 sizeof (struct dasd_diag_characteristics)); 589 info->confdata_size = 0; 590 return 0; 591 } 592 593 static void 594 dasd_diag_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req, 595 struct irb *stat) 596 { 597 DEV_MESSAGE(KERN_ERR, device, "%s", 598 "dump sense not available for DIAG data"); 599 } 600 601 static struct dasd_discipline dasd_diag_discipline = { 602 .owner = THIS_MODULE, 603 .name = "DIAG", 604 .ebcname = "DIAG", 605 .max_blocks = DIAG_MAX_BLOCKS, 606 .check_device = dasd_diag_check_device, 607 .fill_geometry = dasd_diag_fill_geometry, 608 .start_IO = dasd_start_diag, 609 .term_IO = dasd_diag_term_IO, 610 .handle_terminated_request = dasd_diag_handle_terminated_request, 611 .erp_action = dasd_diag_erp_action, 612 .erp_postaction = dasd_diag_erp_postaction, 613 .build_cp = dasd_diag_build_cp, 614 .free_cp = dasd_diag_free_cp, 615 .dump_sense = dasd_diag_dump_sense, 616 .fill_info = dasd_diag_fill_info, 617 }; 618 619 static int __init 620 dasd_diag_init(void) 621 { 622 if (!MACHINE_IS_VM) { 623 MESSAGE_LOG(KERN_INFO, 624 "Machine is not VM: %s " 625 "discipline not initializing", 626 dasd_diag_discipline.name); 627 return -ENODEV; 628 } 629 ASCEBC(dasd_diag_discipline.ebcname, 4); 630 631 ctl_set_bit(0, 9); 632 register_external_interrupt(0x2603, dasd_ext_handler); 633 dasd_diag_discipline_pointer = &dasd_diag_discipline; 634 return 0; 635 } 636 637 static void __exit 638 dasd_diag_cleanup(void) 639 { 640 unregister_external_interrupt(0x2603, dasd_ext_handler); 641 ctl_clear_bit(0, 9); 642 dasd_diag_discipline_pointer = NULL; 643 } 644 645 module_init(dasd_diag_init); 646 module_exit(dasd_diag_cleanup); 647