1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> 4 * Horst Hummel <Horst.Hummel@de.ibm.com> 5 * Carsten Otte <Cotte@de.ibm.com> 6 * Martin Schwidefsky <schwidefsky@de.ibm.com> 7 * Bugreports.to..: <Linux390@de.ibm.com> 8 * Copyright IBM Corp. 1999, 2009 9 */ 10 11 #include <linux/kmod.h> 12 #include <linux/init.h> 13 #include <linux/interrupt.h> 14 #include <linux/ctype.h> 15 #include <linux/major.h> 16 #include <linux/slab.h> 17 #include <linux/hdreg.h> 18 #include <linux/async.h> 19 #include <linux/mutex.h> 20 #include <linux/debugfs.h> 21 #include <linux/seq_file.h> 22 #include <linux/vmalloc.h> 23 24 #include <asm/machine.h> 25 #include <asm/ccwdev.h> 26 #include <asm/ebcdic.h> 27 #include <asm/idals.h> 28 #include <asm/itcw.h> 29 #include <asm/diag.h> 30 31 #include "dasd_int.h" 32 /* 33 * SECTION: Constant definitions to be used within this file 34 */ 35 #define DASD_CHANQ_MAX_SIZE 4 36 37 #define DASD_DIAG_MOD "dasd_diag_mod" 38 39 /* 40 * SECTION: exported variables of dasd.c 41 */ 42 debug_info_t *dasd_debug_area; 43 EXPORT_SYMBOL(dasd_debug_area); 44 static struct dentry *dasd_debugfs_root_entry; 45 struct dasd_discipline *dasd_diag_discipline_pointer; 46 EXPORT_SYMBOL(dasd_diag_discipline_pointer); 47 void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *); 48 49 MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>"); 50 MODULE_DESCRIPTION("Linux on S/390 DASD device driver," 51 " Copyright IBM Corp. 2000"); 52 MODULE_LICENSE("GPL"); 53 54 /* 55 * SECTION: prototypes for static functions of dasd.c 56 */ 57 static int dasd_flush_block_queue(struct dasd_block *); 58 static void dasd_device_tasklet(unsigned long); 59 static void dasd_block_tasklet(unsigned long); 60 static void do_kick_device(struct work_struct *); 61 static void do_reload_device(struct work_struct *); 62 static void do_requeue_requests(struct work_struct *); 63 static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *); 64 static void dasd_device_timeout(struct timer_list *); 65 static void dasd_block_timeout(struct timer_list *); 66 static void __dasd_process_erp(struct dasd_device *, struct dasd_ccw_req *); 67 static void dasd_profile_init(struct dasd_profile *, struct dentry *); 68 static void dasd_profile_exit(struct dasd_profile *); 69 static void dasd_hosts_init(struct dentry *, struct dasd_device *); 70 static void dasd_hosts_exit(struct dasd_device *); 71 static int dasd_handle_autoquiesce(struct dasd_device *, struct dasd_ccw_req *, 72 unsigned int); 73 /* 74 * SECTION: Operations on the device structure. 75 */ 76 static wait_queue_head_t dasd_init_waitq; 77 static wait_queue_head_t dasd_flush_wq; 78 static wait_queue_head_t generic_waitq; 79 static wait_queue_head_t shutdown_waitq; 80 81 /* 82 * Allocate memory for a new device structure. 83 */ 84 struct dasd_device *dasd_alloc_device(void) 85 { 86 struct dasd_device *device; 87 88 device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC); 89 if (!device) 90 return ERR_PTR(-ENOMEM); 91 92 /* Get two pages for normal block device operations. */ 93 device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1); 94 if (!device->ccw_mem) { 95 kfree(device); 96 return ERR_PTR(-ENOMEM); 97 } 98 /* Get one page for error recovery. */ 99 device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA); 100 if (!device->erp_mem) { 101 free_pages((unsigned long) device->ccw_mem, 1); 102 kfree(device); 103 return ERR_PTR(-ENOMEM); 104 } 105 /* Get two pages for ese format. */ 106 device->ese_mem = (void *)__get_free_pages(GFP_ATOMIC | GFP_DMA, 1); 107 if (!device->ese_mem) { 108 free_page((unsigned long) device->erp_mem); 109 free_pages((unsigned long) device->ccw_mem, 1); 110 kfree(device); 111 return ERR_PTR(-ENOMEM); 112 } 113 114 dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2); 115 dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE); 116 dasd_init_chunklist(&device->ese_chunks, device->ese_mem, PAGE_SIZE * 2); 117 spin_lock_init(&device->mem_lock); 118 atomic_set(&device->tasklet_scheduled, 0); 119 tasklet_init(&device->tasklet, dasd_device_tasklet, 120 (unsigned long) device); 121 INIT_LIST_HEAD(&device->ccw_queue); 122 timer_setup(&device->timer, dasd_device_timeout, 0); 123 INIT_WORK(&device->kick_work, do_kick_device); 124 INIT_WORK(&device->reload_device, do_reload_device); 125 INIT_WORK(&device->requeue_requests, do_requeue_requests); 126 device->state = DASD_STATE_NEW; 127 device->target = DASD_STATE_NEW; 128 mutex_init(&device->state_mutex); 129 spin_lock_init(&device->profile.lock); 130 return device; 131 } 132 133 /* 134 * Free memory of a device structure. 135 */ 136 void dasd_free_device(struct dasd_device *device) 137 { 138 kfree(device->private); 139 free_pages((unsigned long) device->ese_mem, 1); 140 free_page((unsigned long) device->erp_mem); 141 free_pages((unsigned long) device->ccw_mem, 1); 142 kfree(device); 143 } 144 145 /* 146 * Allocate memory for a new device structure. 147 */ 148 struct dasd_block *dasd_alloc_block(void) 149 { 150 struct dasd_block *block; 151 152 block = kzalloc(sizeof(*block), GFP_ATOMIC); 153 if (!block) 154 return ERR_PTR(-ENOMEM); 155 /* open_count = 0 means device online but not in use */ 156 atomic_set(&block->open_count, -1); 157 158 atomic_set(&block->tasklet_scheduled, 0); 159 tasklet_init(&block->tasklet, dasd_block_tasklet, 160 (unsigned long) block); 161 INIT_LIST_HEAD(&block->ccw_queue); 162 spin_lock_init(&block->queue_lock); 163 INIT_LIST_HEAD(&block->format_list); 164 spin_lock_init(&block->format_lock); 165 timer_setup(&block->timer, dasd_block_timeout, 0); 166 spin_lock_init(&block->profile.lock); 167 168 return block; 169 } 170 EXPORT_SYMBOL_GPL(dasd_alloc_block); 171 172 /* 173 * Free memory of a device structure. 174 */ 175 void dasd_free_block(struct dasd_block *block) 176 { 177 kfree(block); 178 } 179 EXPORT_SYMBOL_GPL(dasd_free_block); 180 181 /* 182 * Make a new device known to the system. 183 */ 184 static int dasd_state_new_to_known(struct dasd_device *device) 185 { 186 /* 187 * As long as the device is not in state DASD_STATE_NEW we want to 188 * keep the reference count > 0. 189 */ 190 dasd_get_device(device); 191 device->state = DASD_STATE_KNOWN; 192 return 0; 193 } 194 195 /* 196 * Let the system forget about a device. 197 */ 198 static int dasd_state_known_to_new(struct dasd_device *device) 199 { 200 /* Disable extended error reporting for this device. */ 201 dasd_eer_disable(device); 202 device->state = DASD_STATE_NEW; 203 204 /* Give up reference we took in dasd_state_new_to_known. */ 205 dasd_put_device(device); 206 return 0; 207 } 208 209 static struct dentry *dasd_debugfs_setup(const char *name, 210 struct dentry *base_dentry) 211 { 212 struct dentry *pde; 213 214 if (!base_dentry) 215 return NULL; 216 pde = debugfs_create_dir(name, base_dentry); 217 if (!pde || IS_ERR(pde)) 218 return NULL; 219 return pde; 220 } 221 222 /* 223 * Request the irq line for the device. 224 */ 225 static int dasd_state_known_to_basic(struct dasd_device *device) 226 { 227 struct dasd_block *block = device->block; 228 int rc = 0; 229 230 /* Allocate and register gendisk structure. */ 231 if (block) { 232 rc = dasd_gendisk_alloc(block); 233 if (rc) 234 return rc; 235 block->debugfs_dentry = 236 dasd_debugfs_setup(block->gdp->disk_name, 237 dasd_debugfs_root_entry); 238 dasd_profile_init(&block->profile, block->debugfs_dentry); 239 if (dasd_global_profile_level == DASD_PROFILE_ON) 240 dasd_profile_on(&device->block->profile); 241 } 242 device->debugfs_dentry = 243 dasd_debugfs_setup(dev_name(&device->cdev->dev), 244 dasd_debugfs_root_entry); 245 dasd_profile_init(&device->profile, device->debugfs_dentry); 246 dasd_hosts_init(device->debugfs_dentry, device); 247 248 /* register 'device' debug area, used for all DBF_DEV_XXX calls */ 249 device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1, 250 8 * sizeof(long)); 251 debug_register_view(device->debug_area, &debug_sprintf_view); 252 debug_set_level(device->debug_area, DBF_WARNING); 253 DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created"); 254 255 device->state = DASD_STATE_BASIC; 256 257 return rc; 258 } 259 260 /* 261 * Release the irq line for the device. Terminate any running i/o. 262 */ 263 static int dasd_state_basic_to_known(struct dasd_device *device) 264 { 265 int rc; 266 267 if (device->discipline->basic_to_known) { 268 rc = device->discipline->basic_to_known(device); 269 if (rc) 270 return rc; 271 } 272 273 if (device->block) { 274 dasd_profile_exit(&device->block->profile); 275 debugfs_remove(device->block->debugfs_dentry); 276 dasd_gendisk_free(device->block); 277 dasd_block_clear_timer(device->block); 278 } 279 rc = dasd_flush_device_queue(device); 280 if (rc) 281 return rc; 282 dasd_device_clear_timer(device); 283 dasd_profile_exit(&device->profile); 284 dasd_hosts_exit(device); 285 debugfs_remove(device->debugfs_dentry); 286 DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device); 287 if (device->debug_area != NULL) { 288 debug_unregister(device->debug_area); 289 device->debug_area = NULL; 290 } 291 device->state = DASD_STATE_KNOWN; 292 return 0; 293 } 294 295 /* 296 * Do the initial analysis. The do_analysis function may return 297 * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC 298 * until the discipline decides to continue the startup sequence 299 * by calling the function dasd_change_state. The eckd disciplines 300 * uses this to start a ccw that detects the format. The completion 301 * interrupt for this detection ccw uses the kernel event daemon to 302 * trigger the call to dasd_change_state. All this is done in the 303 * discipline code, see dasd_eckd.c. 304 * After the analysis ccw is done (do_analysis returned 0) the block 305 * device is setup. 306 * In case the analysis returns an error, the device setup is stopped 307 * (a fake disk was already added to allow formatting). 308 */ 309 static int dasd_state_basic_to_ready(struct dasd_device *device) 310 { 311 struct dasd_block *block = device->block; 312 struct queue_limits lim; 313 int rc = 0; 314 315 /* make disk known with correct capacity */ 316 if (!block) { 317 device->state = DASD_STATE_READY; 318 goto out; 319 } 320 321 if (block->base->discipline->do_analysis != NULL) 322 rc = block->base->discipline->do_analysis(block); 323 if (rc) { 324 if (rc == -EAGAIN) 325 return rc; 326 device->state = DASD_STATE_UNFMT; 327 kobject_uevent(&disk_to_dev(device->block->gdp)->kobj, 328 KOBJ_CHANGE); 329 goto out; 330 } 331 332 lim = queue_limits_start_update(block->gdp->queue); 333 lim.max_dev_sectors = device->discipline->max_sectors(block); 334 lim.max_hw_sectors = lim.max_dev_sectors; 335 lim.logical_block_size = block->bp_block; 336 337 if (device->discipline->has_discard) { 338 unsigned int max_bytes; 339 340 lim.discard_granularity = block->bp_block; 341 342 /* Calculate max_discard_sectors and make it PAGE aligned */ 343 max_bytes = USHRT_MAX * block->bp_block; 344 max_bytes = ALIGN_DOWN(max_bytes, PAGE_SIZE); 345 346 lim.max_hw_discard_sectors = max_bytes / block->bp_block; 347 lim.max_write_zeroes_sectors = lim.max_hw_discard_sectors; 348 } 349 rc = queue_limits_commit_update(block->gdp->queue, &lim); 350 if (rc) 351 return rc; 352 353 set_capacity(block->gdp, block->blocks << block->s2b_shift); 354 device->state = DASD_STATE_READY; 355 356 rc = dasd_scan_partitions(block); 357 if (rc) { 358 device->state = DASD_STATE_BASIC; 359 return rc; 360 } 361 362 out: 363 if (device->discipline->basic_to_ready) 364 rc = device->discipline->basic_to_ready(device); 365 return rc; 366 } 367 368 static inline 369 int _wait_for_empty_queues(struct dasd_device *device) 370 { 371 if (device->block) 372 return list_empty(&device->ccw_queue) && 373 list_empty(&device->block->ccw_queue); 374 else 375 return list_empty(&device->ccw_queue); 376 } 377 378 /* 379 * Remove device from block device layer. Destroy dirty buffers. 380 * Forget format information. Check if the target level is basic 381 * and if it is create fake disk for formatting. 382 */ 383 static int dasd_state_ready_to_basic(struct dasd_device *device) 384 { 385 int rc; 386 387 device->state = DASD_STATE_BASIC; 388 if (device->block) { 389 struct dasd_block *block = device->block; 390 rc = dasd_flush_block_queue(block); 391 if (rc) { 392 device->state = DASD_STATE_READY; 393 return rc; 394 } 395 dasd_destroy_partitions(block); 396 block->blocks = 0; 397 block->bp_block = 0; 398 block->s2b_shift = 0; 399 } 400 return 0; 401 } 402 403 /* 404 * Back to basic. 405 */ 406 static int dasd_state_unfmt_to_basic(struct dasd_device *device) 407 { 408 device->state = DASD_STATE_BASIC; 409 return 0; 410 } 411 412 /* 413 * Make the device online and schedule the bottom half to start 414 * the requeueing of requests from the linux request queue to the 415 * ccw queue. 416 */ 417 static int 418 dasd_state_ready_to_online(struct dasd_device * device) 419 { 420 device->state = DASD_STATE_ONLINE; 421 if (device->block) { 422 dasd_schedule_block_bh(device->block); 423 if ((device->features & DASD_FEATURE_USERAW)) { 424 kobject_uevent(&disk_to_dev(device->block->gdp)->kobj, 425 KOBJ_CHANGE); 426 return 0; 427 } 428 disk_uevent(file_bdev(device->block->bdev_file)->bd_disk, 429 KOBJ_CHANGE); 430 } 431 return 0; 432 } 433 434 /* 435 * Stop the requeueing of requests again. 436 */ 437 static int dasd_state_online_to_ready(struct dasd_device *device) 438 { 439 int rc; 440 441 if (device->discipline->online_to_ready) { 442 rc = device->discipline->online_to_ready(device); 443 if (rc) 444 return rc; 445 } 446 447 device->state = DASD_STATE_READY; 448 if (device->block && !(device->features & DASD_FEATURE_USERAW)) 449 disk_uevent(file_bdev(device->block->bdev_file)->bd_disk, 450 KOBJ_CHANGE); 451 return 0; 452 } 453 454 /* 455 * Device startup state changes. 456 */ 457 static int dasd_increase_state(struct dasd_device *device) 458 { 459 int rc; 460 461 rc = 0; 462 if (device->state == DASD_STATE_NEW && 463 device->target >= DASD_STATE_KNOWN) 464 rc = dasd_state_new_to_known(device); 465 466 if (!rc && 467 device->state == DASD_STATE_KNOWN && 468 device->target >= DASD_STATE_BASIC) 469 rc = dasd_state_known_to_basic(device); 470 471 if (!rc && 472 device->state == DASD_STATE_BASIC && 473 device->target >= DASD_STATE_READY) 474 rc = dasd_state_basic_to_ready(device); 475 476 if (!rc && 477 device->state == DASD_STATE_UNFMT && 478 device->target > DASD_STATE_UNFMT) 479 rc = -EPERM; 480 481 if (!rc && 482 device->state == DASD_STATE_READY && 483 device->target >= DASD_STATE_ONLINE) 484 rc = dasd_state_ready_to_online(device); 485 486 return rc; 487 } 488 489 /* 490 * Device shutdown state changes. 491 */ 492 static int dasd_decrease_state(struct dasd_device *device) 493 { 494 int rc; 495 496 rc = 0; 497 if (device->state == DASD_STATE_ONLINE && 498 device->target <= DASD_STATE_READY) 499 rc = dasd_state_online_to_ready(device); 500 501 if (!rc && 502 device->state == DASD_STATE_READY && 503 device->target <= DASD_STATE_BASIC) 504 rc = dasd_state_ready_to_basic(device); 505 506 if (!rc && 507 device->state == DASD_STATE_UNFMT && 508 device->target <= DASD_STATE_BASIC) 509 rc = dasd_state_unfmt_to_basic(device); 510 511 if (!rc && 512 device->state == DASD_STATE_BASIC && 513 device->target <= DASD_STATE_KNOWN) 514 rc = dasd_state_basic_to_known(device); 515 516 if (!rc && 517 device->state == DASD_STATE_KNOWN && 518 device->target <= DASD_STATE_NEW) 519 rc = dasd_state_known_to_new(device); 520 521 return rc; 522 } 523 524 /* 525 * This is the main startup/shutdown routine. 526 */ 527 static void dasd_change_state(struct dasd_device *device) 528 { 529 int rc; 530 531 if (device->state == device->target) 532 /* Already where we want to go today... */ 533 return; 534 if (device->state < device->target) 535 rc = dasd_increase_state(device); 536 else 537 rc = dasd_decrease_state(device); 538 if (rc == -EAGAIN) 539 return; 540 if (rc) 541 device->target = device->state; 542 543 /* let user-space know that the device status changed */ 544 kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE); 545 546 if (device->state == device->target) 547 wake_up(&dasd_init_waitq); 548 } 549 550 /* 551 * Kick starter for devices that did not complete the startup/shutdown 552 * procedure or were sleeping because of a pending state. 553 * dasd_kick_device will schedule a call do do_kick_device to the kernel 554 * event daemon. 555 */ 556 static void do_kick_device(struct work_struct *work) 557 { 558 struct dasd_device *device = container_of(work, struct dasd_device, kick_work); 559 mutex_lock(&device->state_mutex); 560 dasd_change_state(device); 561 mutex_unlock(&device->state_mutex); 562 dasd_schedule_device_bh(device); 563 dasd_put_device(device); 564 } 565 566 void dasd_kick_device(struct dasd_device *device) 567 { 568 dasd_get_device(device); 569 /* queue call to dasd_kick_device to the kernel event daemon. */ 570 if (!schedule_work(&device->kick_work)) 571 dasd_put_device(device); 572 } 573 EXPORT_SYMBOL(dasd_kick_device); 574 575 /* 576 * dasd_reload_device will schedule a call do do_reload_device to the kernel 577 * event daemon. 578 */ 579 static void do_reload_device(struct work_struct *work) 580 { 581 struct dasd_device *device = container_of(work, struct dasd_device, 582 reload_device); 583 device->discipline->reload(device); 584 dasd_put_device(device); 585 } 586 587 void dasd_reload_device(struct dasd_device *device) 588 { 589 dasd_get_device(device); 590 /* queue call to dasd_reload_device to the kernel event daemon. */ 591 if (!schedule_work(&device->reload_device)) 592 dasd_put_device(device); 593 } 594 EXPORT_SYMBOL(dasd_reload_device); 595 596 /* 597 * Set the target state for a device and starts the state change. 598 */ 599 void dasd_set_target_state(struct dasd_device *device, int target) 600 { 601 dasd_get_device(device); 602 mutex_lock(&device->state_mutex); 603 /* If we are in probeonly mode stop at DASD_STATE_READY. */ 604 if (dasd_probeonly && target > DASD_STATE_READY) 605 target = DASD_STATE_READY; 606 if (device->target != target) { 607 if (device->state == target) 608 wake_up(&dasd_init_waitq); 609 device->target = target; 610 } 611 if (device->state != device->target) 612 dasd_change_state(device); 613 mutex_unlock(&device->state_mutex); 614 dasd_put_device(device); 615 } 616 617 /* 618 * Enable devices with device numbers in [from..to]. 619 */ 620 static inline int _wait_for_device(struct dasd_device *device) 621 { 622 return (device->state == device->target); 623 } 624 625 void dasd_enable_device(struct dasd_device *device) 626 { 627 dasd_set_target_state(device, DASD_STATE_ONLINE); 628 if (device->state <= DASD_STATE_KNOWN) 629 /* No discipline for device found. */ 630 dasd_set_target_state(device, DASD_STATE_NEW); 631 /* Now wait for the devices to come up. */ 632 wait_event(dasd_init_waitq, _wait_for_device(device)); 633 634 dasd_reload_device(device); 635 if (device->discipline->kick_validate) 636 device->discipline->kick_validate(device); 637 } 638 EXPORT_SYMBOL(dasd_enable_device); 639 640 /* 641 * SECTION: device operation (interrupt handler, start i/o, term i/o ...) 642 */ 643 644 unsigned int dasd_global_profile_level = DASD_PROFILE_OFF; 645 646 #ifdef CONFIG_DASD_PROFILE 647 struct dasd_profile dasd_global_profile = { 648 .lock = __SPIN_LOCK_UNLOCKED(dasd_global_profile.lock), 649 }; 650 static struct dentry *dasd_debugfs_global_entry; 651 652 /* 653 * Add profiling information for cqr before execution. 654 */ 655 static void dasd_profile_start(struct dasd_block *block, 656 struct dasd_ccw_req *cqr, 657 struct request *req) 658 { 659 struct list_head *l; 660 unsigned int counter; 661 struct dasd_device *device; 662 663 /* count the length of the chanq for statistics */ 664 counter = 0; 665 if (dasd_global_profile_level || block->profile.data) 666 list_for_each(l, &block->ccw_queue) 667 if (++counter >= 31) 668 break; 669 670 spin_lock(&dasd_global_profile.lock); 671 if (dasd_global_profile.data) { 672 dasd_global_profile.data->dasd_io_nr_req[counter]++; 673 if (rq_data_dir(req) == READ) 674 dasd_global_profile.data->dasd_read_nr_req[counter]++; 675 } 676 spin_unlock(&dasd_global_profile.lock); 677 678 spin_lock(&block->profile.lock); 679 if (block->profile.data) { 680 block->profile.data->dasd_io_nr_req[counter]++; 681 if (rq_data_dir(req) == READ) 682 block->profile.data->dasd_read_nr_req[counter]++; 683 } 684 spin_unlock(&block->profile.lock); 685 686 /* 687 * We count the request for the start device, even though it may run on 688 * some other device due to error recovery. This way we make sure that 689 * we count each request only once. 690 */ 691 device = cqr->startdev; 692 if (!device->profile.data) 693 return; 694 695 spin_lock(get_ccwdev_lock(device->cdev)); 696 counter = 1; /* request is not yet queued on the start device */ 697 list_for_each(l, &device->ccw_queue) 698 if (++counter >= 31) 699 break; 700 spin_unlock(get_ccwdev_lock(device->cdev)); 701 702 spin_lock(&device->profile.lock); 703 device->profile.data->dasd_io_nr_req[counter]++; 704 if (rq_data_dir(req) == READ) 705 device->profile.data->dasd_read_nr_req[counter]++; 706 spin_unlock(&device->profile.lock); 707 } 708 709 /* 710 * Add profiling information for cqr after execution. 711 */ 712 713 #define dasd_profile_counter(value, index) \ 714 { \ 715 for (index = 0; index < 31 && value >> (2+index); index++) \ 716 ; \ 717 } 718 719 static void dasd_profile_end_add_data(struct dasd_profile_info *data, 720 int is_alias, 721 int is_tpm, 722 int is_read, 723 long sectors, 724 int sectors_ind, 725 int tottime_ind, 726 int tottimeps_ind, 727 int strtime_ind, 728 int irqtime_ind, 729 int irqtimeps_ind, 730 int endtime_ind) 731 { 732 /* in case of an overflow, reset the whole profile */ 733 if (data->dasd_io_reqs == UINT_MAX) { 734 memset(data, 0, sizeof(*data)); 735 ktime_get_real_ts64(&data->starttod); 736 } 737 data->dasd_io_reqs++; 738 data->dasd_io_sects += sectors; 739 if (is_alias) 740 data->dasd_io_alias++; 741 if (is_tpm) 742 data->dasd_io_tpm++; 743 744 data->dasd_io_secs[sectors_ind]++; 745 data->dasd_io_times[tottime_ind]++; 746 data->dasd_io_timps[tottimeps_ind]++; 747 data->dasd_io_time1[strtime_ind]++; 748 data->dasd_io_time2[irqtime_ind]++; 749 data->dasd_io_time2ps[irqtimeps_ind]++; 750 data->dasd_io_time3[endtime_ind]++; 751 752 if (is_read) { 753 data->dasd_read_reqs++; 754 data->dasd_read_sects += sectors; 755 if (is_alias) 756 data->dasd_read_alias++; 757 if (is_tpm) 758 data->dasd_read_tpm++; 759 data->dasd_read_secs[sectors_ind]++; 760 data->dasd_read_times[tottime_ind]++; 761 data->dasd_read_time1[strtime_ind]++; 762 data->dasd_read_time2[irqtime_ind]++; 763 data->dasd_read_time3[endtime_ind]++; 764 } 765 } 766 767 static void dasd_profile_end(struct dasd_block *block, 768 struct dasd_ccw_req *cqr, 769 struct request *req) 770 { 771 unsigned long strtime, irqtime, endtime, tottime; 772 unsigned long tottimeps, sectors; 773 struct dasd_device *device; 774 int sectors_ind, tottime_ind, tottimeps_ind, strtime_ind; 775 int irqtime_ind, irqtimeps_ind, endtime_ind; 776 struct dasd_profile_info *data; 777 778 device = cqr->startdev; 779 if (!(dasd_global_profile_level || 780 block->profile.data || 781 device->profile.data)) 782 return; 783 784 sectors = blk_rq_sectors(req); 785 if (!cqr->buildclk || !cqr->startclk || 786 !cqr->stopclk || !cqr->endclk || 787 !sectors) 788 return; 789 790 strtime = ((cqr->startclk - cqr->buildclk) >> 12); 791 irqtime = ((cqr->stopclk - cqr->startclk) >> 12); 792 endtime = ((cqr->endclk - cqr->stopclk) >> 12); 793 tottime = ((cqr->endclk - cqr->buildclk) >> 12); 794 tottimeps = tottime / sectors; 795 796 dasd_profile_counter(sectors, sectors_ind); 797 dasd_profile_counter(tottime, tottime_ind); 798 dasd_profile_counter(tottimeps, tottimeps_ind); 799 dasd_profile_counter(strtime, strtime_ind); 800 dasd_profile_counter(irqtime, irqtime_ind); 801 dasd_profile_counter(irqtime / sectors, irqtimeps_ind); 802 dasd_profile_counter(endtime, endtime_ind); 803 804 spin_lock(&dasd_global_profile.lock); 805 if (dasd_global_profile.data) { 806 data = dasd_global_profile.data; 807 data->dasd_sum_times += tottime; 808 data->dasd_sum_time_str += strtime; 809 data->dasd_sum_time_irq += irqtime; 810 data->dasd_sum_time_end += endtime; 811 dasd_profile_end_add_data(dasd_global_profile.data, 812 cqr->startdev != block->base, 813 cqr->cpmode == 1, 814 rq_data_dir(req) == READ, 815 sectors, sectors_ind, tottime_ind, 816 tottimeps_ind, strtime_ind, 817 irqtime_ind, irqtimeps_ind, 818 endtime_ind); 819 } 820 spin_unlock(&dasd_global_profile.lock); 821 822 spin_lock(&block->profile.lock); 823 if (block->profile.data) { 824 data = block->profile.data; 825 data->dasd_sum_times += tottime; 826 data->dasd_sum_time_str += strtime; 827 data->dasd_sum_time_irq += irqtime; 828 data->dasd_sum_time_end += endtime; 829 dasd_profile_end_add_data(block->profile.data, 830 cqr->startdev != block->base, 831 cqr->cpmode == 1, 832 rq_data_dir(req) == READ, 833 sectors, sectors_ind, tottime_ind, 834 tottimeps_ind, strtime_ind, 835 irqtime_ind, irqtimeps_ind, 836 endtime_ind); 837 } 838 spin_unlock(&block->profile.lock); 839 840 spin_lock(&device->profile.lock); 841 if (device->profile.data) { 842 data = device->profile.data; 843 data->dasd_sum_times += tottime; 844 data->dasd_sum_time_str += strtime; 845 data->dasd_sum_time_irq += irqtime; 846 data->dasd_sum_time_end += endtime; 847 dasd_profile_end_add_data(device->profile.data, 848 cqr->startdev != block->base, 849 cqr->cpmode == 1, 850 rq_data_dir(req) == READ, 851 sectors, sectors_ind, tottime_ind, 852 tottimeps_ind, strtime_ind, 853 irqtime_ind, irqtimeps_ind, 854 endtime_ind); 855 } 856 spin_unlock(&device->profile.lock); 857 } 858 859 void dasd_profile_reset(struct dasd_profile *profile) 860 { 861 struct dasd_profile_info *data; 862 863 spin_lock_bh(&profile->lock); 864 data = profile->data; 865 if (!data) { 866 spin_unlock_bh(&profile->lock); 867 return; 868 } 869 memset(data, 0, sizeof(*data)); 870 ktime_get_real_ts64(&data->starttod); 871 spin_unlock_bh(&profile->lock); 872 } 873 874 int dasd_profile_on(struct dasd_profile *profile) 875 { 876 struct dasd_profile_info *data; 877 878 data = kzalloc(sizeof(*data), GFP_KERNEL); 879 if (!data) 880 return -ENOMEM; 881 spin_lock_bh(&profile->lock); 882 if (profile->data) { 883 spin_unlock_bh(&profile->lock); 884 kfree(data); 885 return 0; 886 } 887 ktime_get_real_ts64(&data->starttod); 888 profile->data = data; 889 spin_unlock_bh(&profile->lock); 890 return 0; 891 } 892 893 void dasd_profile_off(struct dasd_profile *profile) 894 { 895 spin_lock_bh(&profile->lock); 896 kfree(profile->data); 897 profile->data = NULL; 898 spin_unlock_bh(&profile->lock); 899 } 900 901 char *dasd_get_user_string(const char __user *user_buf, size_t user_len) 902 { 903 char *buffer; 904 905 buffer = vmalloc(user_len + 1); 906 if (buffer == NULL) 907 return ERR_PTR(-ENOMEM); 908 if (copy_from_user(buffer, user_buf, user_len) != 0) { 909 vfree(buffer); 910 return ERR_PTR(-EFAULT); 911 } 912 /* got the string, now strip linefeed. */ 913 if (buffer[user_len - 1] == '\n') 914 buffer[user_len - 1] = 0; 915 else 916 buffer[user_len] = 0; 917 return buffer; 918 } 919 920 static ssize_t dasd_stats_write(struct file *file, 921 const char __user *user_buf, 922 size_t user_len, loff_t *pos) 923 { 924 char *buffer, *str; 925 int rc; 926 struct seq_file *m = (struct seq_file *)file->private_data; 927 struct dasd_profile *prof = m->private; 928 929 if (user_len > 65536) 930 user_len = 65536; 931 buffer = dasd_get_user_string(user_buf, user_len); 932 if (IS_ERR(buffer)) 933 return PTR_ERR(buffer); 934 935 str = skip_spaces(buffer); 936 rc = user_len; 937 if (strncmp(str, "reset", 5) == 0) { 938 dasd_profile_reset(prof); 939 } else if (strncmp(str, "on", 2) == 0) { 940 rc = dasd_profile_on(prof); 941 if (rc) 942 goto out; 943 rc = user_len; 944 if (prof == &dasd_global_profile) { 945 dasd_profile_reset(prof); 946 dasd_global_profile_level = DASD_PROFILE_GLOBAL_ONLY; 947 } 948 } else if (strncmp(str, "off", 3) == 0) { 949 if (prof == &dasd_global_profile) 950 dasd_global_profile_level = DASD_PROFILE_OFF; 951 dasd_profile_off(prof); 952 } else 953 rc = -EINVAL; 954 out: 955 vfree(buffer); 956 return rc; 957 } 958 959 static void dasd_stats_array(struct seq_file *m, unsigned int *array) 960 { 961 int i; 962 963 for (i = 0; i < 32; i++) 964 seq_printf(m, "%u ", array[i]); 965 seq_putc(m, '\n'); 966 } 967 968 static void dasd_stats_seq_print(struct seq_file *m, 969 struct dasd_profile_info *data) 970 { 971 seq_printf(m, "start_time %lld.%09ld\n", 972 (s64)data->starttod.tv_sec, data->starttod.tv_nsec); 973 seq_printf(m, "total_requests %u\n", data->dasd_io_reqs); 974 seq_printf(m, "total_sectors %u\n", data->dasd_io_sects); 975 seq_printf(m, "total_pav %u\n", data->dasd_io_alias); 976 seq_printf(m, "total_hpf %u\n", data->dasd_io_tpm); 977 seq_printf(m, "avg_total %lu\n", data->dasd_io_reqs ? 978 data->dasd_sum_times / data->dasd_io_reqs : 0UL); 979 seq_printf(m, "avg_build_to_ssch %lu\n", data->dasd_io_reqs ? 980 data->dasd_sum_time_str / data->dasd_io_reqs : 0UL); 981 seq_printf(m, "avg_ssch_to_irq %lu\n", data->dasd_io_reqs ? 982 data->dasd_sum_time_irq / data->dasd_io_reqs : 0UL); 983 seq_printf(m, "avg_irq_to_end %lu\n", data->dasd_io_reqs ? 984 data->dasd_sum_time_end / data->dasd_io_reqs : 0UL); 985 seq_puts(m, "histogram_sectors "); 986 dasd_stats_array(m, data->dasd_io_secs); 987 seq_puts(m, "histogram_io_times "); 988 dasd_stats_array(m, data->dasd_io_times); 989 seq_puts(m, "histogram_io_times_weighted "); 990 dasd_stats_array(m, data->dasd_io_timps); 991 seq_puts(m, "histogram_time_build_to_ssch "); 992 dasd_stats_array(m, data->dasd_io_time1); 993 seq_puts(m, "histogram_time_ssch_to_irq "); 994 dasd_stats_array(m, data->dasd_io_time2); 995 seq_puts(m, "histogram_time_ssch_to_irq_weighted "); 996 dasd_stats_array(m, data->dasd_io_time2ps); 997 seq_puts(m, "histogram_time_irq_to_end "); 998 dasd_stats_array(m, data->dasd_io_time3); 999 seq_puts(m, "histogram_ccw_queue_length "); 1000 dasd_stats_array(m, data->dasd_io_nr_req); 1001 seq_printf(m, "total_read_requests %u\n", data->dasd_read_reqs); 1002 seq_printf(m, "total_read_sectors %u\n", data->dasd_read_sects); 1003 seq_printf(m, "total_read_pav %u\n", data->dasd_read_alias); 1004 seq_printf(m, "total_read_hpf %u\n", data->dasd_read_tpm); 1005 seq_puts(m, "histogram_read_sectors "); 1006 dasd_stats_array(m, data->dasd_read_secs); 1007 seq_puts(m, "histogram_read_times "); 1008 dasd_stats_array(m, data->dasd_read_times); 1009 seq_puts(m, "histogram_read_time_build_to_ssch "); 1010 dasd_stats_array(m, data->dasd_read_time1); 1011 seq_puts(m, "histogram_read_time_ssch_to_irq "); 1012 dasd_stats_array(m, data->dasd_read_time2); 1013 seq_puts(m, "histogram_read_time_irq_to_end "); 1014 dasd_stats_array(m, data->dasd_read_time3); 1015 seq_puts(m, "histogram_read_ccw_queue_length "); 1016 dasd_stats_array(m, data->dasd_read_nr_req); 1017 } 1018 1019 static int dasd_stats_show(struct seq_file *m, void *v) 1020 { 1021 struct dasd_profile *profile; 1022 struct dasd_profile_info *data; 1023 1024 profile = m->private; 1025 spin_lock_bh(&profile->lock); 1026 data = profile->data; 1027 if (!data) { 1028 spin_unlock_bh(&profile->lock); 1029 seq_puts(m, "disabled\n"); 1030 return 0; 1031 } 1032 dasd_stats_seq_print(m, data); 1033 spin_unlock_bh(&profile->lock); 1034 return 0; 1035 } 1036 1037 static int dasd_stats_open(struct inode *inode, struct file *file) 1038 { 1039 struct dasd_profile *profile = inode->i_private; 1040 return single_open(file, dasd_stats_show, profile); 1041 } 1042 1043 static const struct file_operations dasd_stats_raw_fops = { 1044 .owner = THIS_MODULE, 1045 .open = dasd_stats_open, 1046 .read = seq_read, 1047 .llseek = seq_lseek, 1048 .release = single_release, 1049 .write = dasd_stats_write, 1050 }; 1051 1052 static void dasd_profile_init(struct dasd_profile *profile, 1053 struct dentry *base_dentry) 1054 { 1055 umode_t mode; 1056 struct dentry *pde; 1057 1058 if (!base_dentry) 1059 return; 1060 profile->dentry = NULL; 1061 profile->data = NULL; 1062 mode = (S_IRUSR | S_IWUSR | S_IFREG); 1063 pde = debugfs_create_file("statistics", mode, base_dentry, 1064 profile, &dasd_stats_raw_fops); 1065 if (pde && !IS_ERR(pde)) 1066 profile->dentry = pde; 1067 return; 1068 } 1069 1070 static void dasd_profile_exit(struct dasd_profile *profile) 1071 { 1072 dasd_profile_off(profile); 1073 debugfs_remove(profile->dentry); 1074 profile->dentry = NULL; 1075 } 1076 1077 static void dasd_statistics_removeroot(void) 1078 { 1079 dasd_global_profile_level = DASD_PROFILE_OFF; 1080 dasd_profile_exit(&dasd_global_profile); 1081 debugfs_remove(dasd_debugfs_global_entry); 1082 debugfs_remove(dasd_debugfs_root_entry); 1083 } 1084 1085 static void dasd_statistics_createroot(void) 1086 { 1087 struct dentry *pde; 1088 1089 dasd_debugfs_root_entry = NULL; 1090 pde = debugfs_create_dir("dasd", NULL); 1091 if (!pde || IS_ERR(pde)) 1092 goto error; 1093 dasd_debugfs_root_entry = pde; 1094 pde = debugfs_create_dir("global", dasd_debugfs_root_entry); 1095 if (!pde || IS_ERR(pde)) 1096 goto error; 1097 dasd_debugfs_global_entry = pde; 1098 dasd_profile_init(&dasd_global_profile, dasd_debugfs_global_entry); 1099 return; 1100 1101 error: 1102 DBF_EVENT(DBF_ERR, "%s", 1103 "Creation of the dasd debugfs interface failed"); 1104 dasd_statistics_removeroot(); 1105 return; 1106 } 1107 1108 #else 1109 #define dasd_profile_start(block, cqr, req) do {} while (0) 1110 #define dasd_profile_end(block, cqr, req) do {} while (0) 1111 1112 static void dasd_statistics_createroot(void) 1113 { 1114 return; 1115 } 1116 1117 static void dasd_statistics_removeroot(void) 1118 { 1119 return; 1120 } 1121 1122 static void dasd_profile_init(struct dasd_profile *profile, 1123 struct dentry *base_dentry) 1124 { 1125 return; 1126 } 1127 1128 static void dasd_profile_exit(struct dasd_profile *profile) 1129 { 1130 return; 1131 } 1132 1133 int dasd_profile_on(struct dasd_profile *profile) 1134 { 1135 return 0; 1136 } 1137 1138 #endif /* CONFIG_DASD_PROFILE */ 1139 1140 static int dasd_hosts_show(struct seq_file *m, void *v) 1141 { 1142 struct dasd_device *device; 1143 int rc = -EOPNOTSUPP; 1144 1145 device = m->private; 1146 dasd_get_device(device); 1147 1148 if (device->discipline->hosts_print) 1149 rc = device->discipline->hosts_print(device, m); 1150 1151 dasd_put_device(device); 1152 return rc; 1153 } 1154 1155 DEFINE_SHOW_ATTRIBUTE(dasd_hosts); 1156 1157 static void dasd_hosts_exit(struct dasd_device *device) 1158 { 1159 debugfs_remove(device->hosts_dentry); 1160 device->hosts_dentry = NULL; 1161 } 1162 1163 static void dasd_hosts_init(struct dentry *base_dentry, 1164 struct dasd_device *device) 1165 { 1166 struct dentry *pde; 1167 umode_t mode; 1168 1169 if (!base_dentry) 1170 return; 1171 1172 mode = S_IRUSR | S_IFREG; 1173 pde = debugfs_create_file("host_access_list", mode, base_dentry, 1174 device, &dasd_hosts_fops); 1175 if (pde && !IS_ERR(pde)) 1176 device->hosts_dentry = pde; 1177 } 1178 1179 struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength, int datasize, 1180 struct dasd_device *device, 1181 struct dasd_ccw_req *cqr) 1182 { 1183 unsigned long flags; 1184 char *data, *chunk; 1185 int size = 0; 1186 1187 if (cplength > 0) 1188 size += cplength * sizeof(struct ccw1); 1189 if (datasize > 0) 1190 size += datasize; 1191 if (!cqr) 1192 size += (sizeof(*cqr) + 7L) & -8L; 1193 1194 spin_lock_irqsave(&device->mem_lock, flags); 1195 data = chunk = dasd_alloc_chunk(&device->ccw_chunks, size); 1196 spin_unlock_irqrestore(&device->mem_lock, flags); 1197 if (!chunk) 1198 return ERR_PTR(-ENOMEM); 1199 if (!cqr) { 1200 cqr = (void *) data; 1201 data += (sizeof(*cqr) + 7L) & -8L; 1202 } 1203 memset(cqr, 0, sizeof(*cqr)); 1204 cqr->mem_chunk = chunk; 1205 if (cplength > 0) { 1206 cqr->cpaddr = data; 1207 data += cplength * sizeof(struct ccw1); 1208 memset(cqr->cpaddr, 0, cplength * sizeof(struct ccw1)); 1209 } 1210 if (datasize > 0) { 1211 cqr->data = data; 1212 memset(cqr->data, 0, datasize); 1213 } 1214 cqr->magic = magic; 1215 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); 1216 dasd_get_device(device); 1217 return cqr; 1218 } 1219 EXPORT_SYMBOL(dasd_smalloc_request); 1220 1221 struct dasd_ccw_req *dasd_fmalloc_request(int magic, int cplength, 1222 int datasize, 1223 struct dasd_device *device) 1224 { 1225 struct dasd_ccw_req *cqr; 1226 unsigned long flags; 1227 int size, cqr_size; 1228 char *data; 1229 1230 cqr_size = (sizeof(*cqr) + 7L) & -8L; 1231 size = cqr_size; 1232 if (cplength > 0) 1233 size += cplength * sizeof(struct ccw1); 1234 if (datasize > 0) 1235 size += datasize; 1236 1237 spin_lock_irqsave(&device->mem_lock, flags); 1238 cqr = dasd_alloc_chunk(&device->ese_chunks, size); 1239 spin_unlock_irqrestore(&device->mem_lock, flags); 1240 if (!cqr) 1241 return ERR_PTR(-ENOMEM); 1242 memset(cqr, 0, sizeof(*cqr)); 1243 data = (char *)cqr + cqr_size; 1244 cqr->cpaddr = NULL; 1245 if (cplength > 0) { 1246 cqr->cpaddr = data; 1247 data += cplength * sizeof(struct ccw1); 1248 memset(cqr->cpaddr, 0, cplength * sizeof(struct ccw1)); 1249 } 1250 cqr->data = NULL; 1251 if (datasize > 0) { 1252 cqr->data = data; 1253 memset(cqr->data, 0, datasize); 1254 } 1255 1256 cqr->magic = magic; 1257 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); 1258 dasd_get_device(device); 1259 1260 return cqr; 1261 } 1262 EXPORT_SYMBOL(dasd_fmalloc_request); 1263 1264 void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) 1265 { 1266 unsigned long flags; 1267 1268 spin_lock_irqsave(&device->mem_lock, flags); 1269 dasd_free_chunk(&device->ccw_chunks, cqr->mem_chunk); 1270 spin_unlock_irqrestore(&device->mem_lock, flags); 1271 dasd_put_device(device); 1272 } 1273 EXPORT_SYMBOL(dasd_sfree_request); 1274 1275 void dasd_ffree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) 1276 { 1277 unsigned long flags; 1278 1279 spin_lock_irqsave(&device->mem_lock, flags); 1280 dasd_free_chunk(&device->ese_chunks, cqr); 1281 spin_unlock_irqrestore(&device->mem_lock, flags); 1282 dasd_put_device(device); 1283 } 1284 EXPORT_SYMBOL(dasd_ffree_request); 1285 1286 /* 1287 * Check discipline magic in cqr. 1288 */ 1289 static inline int dasd_check_cqr(struct dasd_ccw_req *cqr) 1290 { 1291 struct dasd_device *device; 1292 1293 if (cqr == NULL) 1294 return -EINVAL; 1295 device = cqr->startdev; 1296 if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) { 1297 DBF_DEV_EVENT(DBF_WARNING, device, 1298 " dasd_ccw_req 0x%08x magic doesn't match" 1299 " discipline 0x%08x", 1300 cqr->magic, 1301 *(unsigned int *) device->discipline->name); 1302 return -EINVAL; 1303 } 1304 return 0; 1305 } 1306 1307 /* 1308 * Terminate the current i/o and set the request to clear_pending. 1309 * Timer keeps device runnig. 1310 * ccw_device_clear can fail if the i/o subsystem 1311 * is in a bad mood. 1312 */ 1313 int dasd_term_IO(struct dasd_ccw_req *cqr) 1314 { 1315 struct dasd_device *device; 1316 int retries, rc; 1317 1318 /* Check the cqr */ 1319 rc = dasd_check_cqr(cqr); 1320 if (rc) 1321 return rc; 1322 retries = 0; 1323 device = (struct dasd_device *) cqr->startdev; 1324 while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) { 1325 rc = ccw_device_clear(device->cdev, (long) cqr); 1326 switch (rc) { 1327 case 0: /* termination successful */ 1328 cqr->status = DASD_CQR_CLEAR_PENDING; 1329 cqr->stopclk = get_tod_clock(); 1330 cqr->starttime = 0; 1331 DBF_DEV_EVENT(DBF_DEBUG, device, 1332 "terminate cqr %p successful", 1333 cqr); 1334 break; 1335 case -ENODEV: 1336 DBF_DEV_EVENT(DBF_ERR, device, "%s", 1337 "device gone, retry"); 1338 break; 1339 case -EINVAL: 1340 /* 1341 * device not valid so no I/O could be running 1342 * handle CQR as termination successful 1343 */ 1344 cqr->status = DASD_CQR_CLEARED; 1345 cqr->stopclk = get_tod_clock(); 1346 cqr->starttime = 0; 1347 /* no retries for invalid devices */ 1348 cqr->retries = -1; 1349 DBF_DEV_EVENT(DBF_ERR, device, "%s", 1350 "EINVAL, handle as terminated"); 1351 /* fake rc to success */ 1352 rc = 0; 1353 break; 1354 default: 1355 dev_err(&device->cdev->dev, 1356 "Unexpected error during request termination %d\n", rc); 1357 BUG(); 1358 break; 1359 } 1360 retries++; 1361 } 1362 dasd_schedule_device_bh(device); 1363 return rc; 1364 } 1365 EXPORT_SYMBOL(dasd_term_IO); 1366 1367 /* 1368 * Start the i/o. This start_IO can fail if the channel is really busy. 1369 * In that case set up a timer to start the request later. 1370 */ 1371 int dasd_start_IO(struct dasd_ccw_req *cqr) 1372 { 1373 struct dasd_device *device; 1374 int rc; 1375 1376 /* Check the cqr */ 1377 rc = dasd_check_cqr(cqr); 1378 if (rc) { 1379 cqr->intrc = rc; 1380 return rc; 1381 } 1382 device = (struct dasd_device *) cqr->startdev; 1383 if (((cqr->block && 1384 test_bit(DASD_FLAG_LOCK_STOLEN, &cqr->block->base->flags)) || 1385 test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) && 1386 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { 1387 DBF_DEV_EVENT(DBF_DEBUG, device, "start_IO: return request %p " 1388 "because of stolen lock", cqr); 1389 cqr->status = DASD_CQR_ERROR; 1390 cqr->intrc = -EPERM; 1391 return -EPERM; 1392 } 1393 if (cqr->retries < 0) { 1394 dev_err(&device->cdev->dev, 1395 "Start I/O ran out of retries\n"); 1396 cqr->status = DASD_CQR_ERROR; 1397 return -EIO; 1398 } 1399 cqr->startclk = get_tod_clock(); 1400 cqr->starttime = jiffies; 1401 cqr->retries--; 1402 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { 1403 cqr->lpm &= dasd_path_get_opm(device); 1404 if (!cqr->lpm) 1405 cqr->lpm = dasd_path_get_opm(device); 1406 } 1407 /* 1408 * remember the amount of formatted tracks to prevent double format on 1409 * ESE devices 1410 */ 1411 if (cqr->block) 1412 cqr->trkcount = atomic_read(&cqr->block->trkcount); 1413 1414 if (cqr->cpmode == 1) { 1415 rc = ccw_device_tm_start(device->cdev, cqr->cpaddr, 1416 (long) cqr, cqr->lpm); 1417 } else { 1418 rc = ccw_device_start(device->cdev, cqr->cpaddr, 1419 (long) cqr, cqr->lpm, 0); 1420 } 1421 switch (rc) { 1422 case 0: 1423 cqr->status = DASD_CQR_IN_IO; 1424 break; 1425 case -EBUSY: 1426 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1427 "start_IO: device busy, retry later"); 1428 break; 1429 case -EACCES: 1430 /* -EACCES indicates that the request used only a subset of the 1431 * available paths and all these paths are gone. If the lpm of 1432 * this request was only a subset of the opm (e.g. the ppm) then 1433 * we just do a retry with all available paths. 1434 * If we already use the full opm, something is amiss, and we 1435 * need a full path verification. 1436 */ 1437 if (test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { 1438 DBF_DEV_EVENT(DBF_WARNING, device, 1439 "start_IO: selected paths gone (%x)", 1440 cqr->lpm); 1441 } else if (cqr->lpm != dasd_path_get_opm(device)) { 1442 cqr->lpm = dasd_path_get_opm(device); 1443 DBF_DEV_EVENT(DBF_DEBUG, device, "%s", 1444 "start_IO: selected paths gone," 1445 " retry on all paths"); 1446 } else { 1447 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1448 "start_IO: all paths in opm gone," 1449 " do path verification"); 1450 dasd_generic_last_path_gone(device); 1451 dasd_path_no_path(device); 1452 dasd_path_set_tbvpm(device, 1453 ccw_device_get_path_mask( 1454 device->cdev)); 1455 } 1456 break; 1457 case -ENODEV: 1458 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1459 "start_IO: -ENODEV device gone, retry"); 1460 /* this is equivalent to CC=3 for SSCH report this to EER */ 1461 dasd_handle_autoquiesce(device, cqr, DASD_EER_STARTIO); 1462 break; 1463 case -EIO: 1464 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1465 "start_IO: -EIO device gone, retry"); 1466 break; 1467 case -EINVAL: 1468 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1469 "start_IO: -EINVAL device currently " 1470 "not accessible"); 1471 break; 1472 default: 1473 dev_err(&device->cdev->dev, 1474 "Unexpected error during request start %d", rc); 1475 BUG(); 1476 break; 1477 } 1478 cqr->intrc = rc; 1479 return rc; 1480 } 1481 EXPORT_SYMBOL(dasd_start_IO); 1482 1483 /* 1484 * Timeout function for dasd devices. This is used for different purposes 1485 * 1) missing interrupt handler for normal operation 1486 * 2) delayed start of request where start_IO failed with -EBUSY 1487 * 3) timeout for missing state change interrupts 1488 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1), 1489 * DASD_CQR_QUEUED for 2) and 3). 1490 */ 1491 static void dasd_device_timeout(struct timer_list *t) 1492 { 1493 unsigned long flags; 1494 struct dasd_device *device; 1495 1496 device = from_timer(device, t, timer); 1497 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 1498 /* re-activate request queue */ 1499 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING); 1500 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 1501 dasd_schedule_device_bh(device); 1502 } 1503 1504 /* 1505 * Setup timeout for a device in jiffies. 1506 */ 1507 void dasd_device_set_timer(struct dasd_device *device, int expires) 1508 { 1509 if (expires == 0) 1510 del_timer(&device->timer); 1511 else 1512 mod_timer(&device->timer, jiffies + expires); 1513 } 1514 EXPORT_SYMBOL(dasd_device_set_timer); 1515 1516 /* 1517 * Clear timeout for a device. 1518 */ 1519 void dasd_device_clear_timer(struct dasd_device *device) 1520 { 1521 del_timer(&device->timer); 1522 } 1523 EXPORT_SYMBOL(dasd_device_clear_timer); 1524 1525 static void dasd_handle_killed_request(struct ccw_device *cdev, 1526 unsigned long intparm) 1527 { 1528 struct dasd_ccw_req *cqr; 1529 struct dasd_device *device; 1530 1531 if (!intparm) 1532 return; 1533 cqr = (struct dasd_ccw_req *) intparm; 1534 if (cqr->status != DASD_CQR_IN_IO) { 1535 DBF_EVENT_DEVID(DBF_DEBUG, cdev, 1536 "invalid status in handle_killed_request: " 1537 "%02x", cqr->status); 1538 return; 1539 } 1540 1541 device = dasd_device_from_cdev_locked(cdev); 1542 if (IS_ERR(device)) { 1543 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", 1544 "unable to get device from cdev"); 1545 return; 1546 } 1547 1548 if (!cqr->startdev || 1549 device != cqr->startdev || 1550 strncmp(cqr->startdev->discipline->ebcname, 1551 (char *) &cqr->magic, 4)) { 1552 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", 1553 "invalid device in request"); 1554 dasd_put_device(device); 1555 return; 1556 } 1557 1558 /* Schedule request to be retried. */ 1559 cqr->status = DASD_CQR_QUEUED; 1560 1561 dasd_device_clear_timer(device); 1562 dasd_schedule_device_bh(device); 1563 dasd_put_device(device); 1564 } 1565 1566 void dasd_generic_handle_state_change(struct dasd_device *device) 1567 { 1568 /* First of all start sense subsystem status request. */ 1569 dasd_eer_snss(device); 1570 1571 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING); 1572 dasd_schedule_device_bh(device); 1573 if (device->block) { 1574 dasd_schedule_block_bh(device->block); 1575 if (device->block->gdp) 1576 blk_mq_run_hw_queues(device->block->gdp->queue, true); 1577 } 1578 } 1579 EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change); 1580 1581 static int dasd_check_hpf_error(struct irb *irb) 1582 { 1583 return (scsw_tm_is_valid_schxs(&irb->scsw) && 1584 (irb->scsw.tm.sesq == SCSW_SESQ_DEV_NOFCX || 1585 irb->scsw.tm.sesq == SCSW_SESQ_PATH_NOFCX)); 1586 } 1587 1588 static int dasd_ese_needs_format(struct dasd_block *block, struct irb *irb) 1589 { 1590 struct dasd_device *device = NULL; 1591 u8 *sense = NULL; 1592 1593 if (!block) 1594 return 0; 1595 device = block->base; 1596 if (!device || !device->discipline->is_ese) 1597 return 0; 1598 if (!device->discipline->is_ese(device)) 1599 return 0; 1600 1601 sense = dasd_get_sense(irb); 1602 if (!sense) 1603 return 0; 1604 1605 if (sense[1] & SNS1_NO_REC_FOUND) 1606 return 1; 1607 1608 if ((sense[1] & SNS1_INV_TRACK_FORMAT) && 1609 scsw_is_tm(&irb->scsw) && 1610 !(sense[2] & SNS2_ENV_DATA_PRESENT)) 1611 return 1; 1612 1613 return 0; 1614 } 1615 1616 static int dasd_ese_oos_cond(u8 *sense) 1617 { 1618 return sense[0] & SNS0_EQUIPMENT_CHECK && 1619 sense[1] & SNS1_PERM_ERR && 1620 sense[1] & SNS1_WRITE_INHIBITED && 1621 sense[25] == 0x01; 1622 } 1623 1624 /* 1625 * Interrupt handler for "normal" ssch-io based dasd devices. 1626 */ 1627 void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, 1628 struct irb *irb) 1629 { 1630 struct dasd_ccw_req *cqr, *next, *fcqr; 1631 struct dasd_device *device; 1632 unsigned long now; 1633 int nrf_suppressed = 0; 1634 int it_suppressed = 0; 1635 struct request *req; 1636 u8 *sense = NULL; 1637 int expires; 1638 1639 cqr = (struct dasd_ccw_req *) intparm; 1640 if (IS_ERR(irb)) { 1641 switch (PTR_ERR(irb)) { 1642 case -EIO: 1643 if (cqr && cqr->status == DASD_CQR_CLEAR_PENDING) { 1644 device = cqr->startdev; 1645 cqr->status = DASD_CQR_CLEARED; 1646 dasd_device_clear_timer(device); 1647 wake_up(&dasd_flush_wq); 1648 dasd_schedule_device_bh(device); 1649 return; 1650 } 1651 break; 1652 case -ETIMEDOUT: 1653 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: " 1654 "request timed out\n", __func__); 1655 break; 1656 default: 1657 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: " 1658 "unknown error %ld\n", __func__, 1659 PTR_ERR(irb)); 1660 } 1661 dasd_handle_killed_request(cdev, intparm); 1662 return; 1663 } 1664 1665 now = get_tod_clock(); 1666 /* check for conditions that should be handled immediately */ 1667 if (!cqr || 1668 !(scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && 1669 scsw_cstat(&irb->scsw) == 0)) { 1670 if (cqr) 1671 memcpy(&cqr->irb, irb, sizeof(*irb)); 1672 device = dasd_device_from_cdev_locked(cdev); 1673 if (IS_ERR(device)) 1674 return; 1675 /* ignore unsolicited interrupts for DIAG discipline */ 1676 if (device->discipline == dasd_diag_discipline_pointer) { 1677 dasd_put_device(device); 1678 return; 1679 } 1680 1681 /* 1682 * In some cases 'File Protected' or 'No Record Found' errors 1683 * might be expected and debug log messages for the 1684 * corresponding interrupts shouldn't be written then. 1685 * Check if either of the according suppress bits is set. 1686 */ 1687 sense = dasd_get_sense(irb); 1688 if (sense) { 1689 it_suppressed = (sense[1] & SNS1_INV_TRACK_FORMAT) && 1690 !(sense[2] & SNS2_ENV_DATA_PRESENT) && 1691 test_bit(DASD_CQR_SUPPRESS_IT, &cqr->flags); 1692 nrf_suppressed = (sense[1] & SNS1_NO_REC_FOUND) && 1693 test_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags); 1694 1695 /* 1696 * Extent pool probably out-of-space. 1697 * Stop device and check exhaust level. 1698 */ 1699 if (dasd_ese_oos_cond(sense)) { 1700 dasd_generic_space_exhaust(device, cqr); 1701 device->discipline->ext_pool_exhaust(device, cqr); 1702 dasd_put_device(device); 1703 return; 1704 } 1705 } 1706 if (!(it_suppressed || nrf_suppressed)) 1707 device->discipline->dump_sense_dbf(device, irb, "int"); 1708 1709 if (device->features & DASD_FEATURE_ERPLOG) 1710 device->discipline->dump_sense(device, cqr, irb); 1711 device->discipline->check_for_device_change(device, cqr, irb); 1712 dasd_put_device(device); 1713 } 1714 1715 /* check for attention message */ 1716 if (scsw_dstat(&irb->scsw) & DEV_STAT_ATTENTION) { 1717 device = dasd_device_from_cdev_locked(cdev); 1718 if (!IS_ERR(device)) { 1719 device->discipline->check_attention(device, 1720 irb->esw.esw1.lpum); 1721 dasd_put_device(device); 1722 } 1723 } 1724 1725 if (!cqr) 1726 return; 1727 1728 device = (struct dasd_device *) cqr->startdev; 1729 if (!device || 1730 strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { 1731 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", 1732 "invalid device in request"); 1733 return; 1734 } 1735 1736 if (dasd_ese_needs_format(cqr->block, irb)) { 1737 req = dasd_get_callback_data(cqr); 1738 if (!req) { 1739 cqr->status = DASD_CQR_ERROR; 1740 return; 1741 } 1742 if (rq_data_dir(req) == READ) { 1743 device->discipline->ese_read(cqr, irb); 1744 cqr->status = DASD_CQR_SUCCESS; 1745 cqr->stopclk = now; 1746 dasd_device_clear_timer(device); 1747 dasd_schedule_device_bh(device); 1748 return; 1749 } 1750 fcqr = device->discipline->ese_format(device, cqr, irb); 1751 if (IS_ERR(fcqr)) { 1752 if (PTR_ERR(fcqr) == -EINVAL) { 1753 cqr->status = DASD_CQR_ERROR; 1754 return; 1755 } 1756 /* 1757 * If we can't format now, let the request go 1758 * one extra round. Maybe we can format later. 1759 */ 1760 cqr->status = DASD_CQR_QUEUED; 1761 dasd_schedule_device_bh(device); 1762 return; 1763 } else { 1764 fcqr->status = DASD_CQR_QUEUED; 1765 cqr->status = DASD_CQR_QUEUED; 1766 list_add(&fcqr->devlist, &device->ccw_queue); 1767 dasd_schedule_device_bh(device); 1768 return; 1769 } 1770 } 1771 1772 /* Check for clear pending */ 1773 if (cqr->status == DASD_CQR_CLEAR_PENDING && 1774 scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) { 1775 cqr->status = DASD_CQR_CLEARED; 1776 dasd_device_clear_timer(device); 1777 wake_up(&dasd_flush_wq); 1778 dasd_schedule_device_bh(device); 1779 return; 1780 } 1781 1782 /* check status - the request might have been killed by dyn detach */ 1783 if (cqr->status != DASD_CQR_IN_IO) { 1784 DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, " 1785 "status %02x", dev_name(&cdev->dev), cqr->status); 1786 return; 1787 } 1788 1789 next = NULL; 1790 expires = 0; 1791 if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && 1792 scsw_cstat(&irb->scsw) == 0) { 1793 /* request was completed successfully */ 1794 cqr->status = DASD_CQR_SUCCESS; 1795 cqr->stopclk = now; 1796 /* Start first request on queue if possible -> fast_io. */ 1797 if (cqr->devlist.next != &device->ccw_queue) { 1798 next = list_entry(cqr->devlist.next, 1799 struct dasd_ccw_req, devlist); 1800 } 1801 } else { /* error */ 1802 /* check for HPF error 1803 * call discipline function to requeue all requests 1804 * and disable HPF accordingly 1805 */ 1806 if (cqr->cpmode && dasd_check_hpf_error(irb) && 1807 device->discipline->handle_hpf_error) 1808 device->discipline->handle_hpf_error(device, irb); 1809 /* 1810 * If we don't want complex ERP for this request, then just 1811 * reset this and retry it in the fastpath 1812 */ 1813 if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) && 1814 cqr->retries > 0) { 1815 if (cqr->lpm == dasd_path_get_opm(device)) 1816 DBF_DEV_EVENT(DBF_DEBUG, device, 1817 "default ERP in fastpath " 1818 "(%i retries left)", 1819 cqr->retries); 1820 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) 1821 cqr->lpm = dasd_path_get_opm(device); 1822 cqr->status = DASD_CQR_QUEUED; 1823 next = cqr; 1824 } else 1825 cqr->status = DASD_CQR_ERROR; 1826 } 1827 if (next && (next->status == DASD_CQR_QUEUED) && 1828 (!device->stopped)) { 1829 if (device->discipline->start_IO(next) == 0) 1830 expires = next->expires; 1831 } 1832 if (expires != 0) 1833 dasd_device_set_timer(device, expires); 1834 else 1835 dasd_device_clear_timer(device); 1836 dasd_schedule_device_bh(device); 1837 } 1838 EXPORT_SYMBOL(dasd_int_handler); 1839 1840 enum uc_todo dasd_generic_uc_handler(struct ccw_device *cdev, struct irb *irb) 1841 { 1842 struct dasd_device *device; 1843 1844 device = dasd_device_from_cdev_locked(cdev); 1845 1846 if (IS_ERR(device)) 1847 goto out; 1848 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) || 1849 device->state != device->target || 1850 !device->discipline->check_for_device_change){ 1851 dasd_put_device(device); 1852 goto out; 1853 } 1854 if (device->discipline->dump_sense_dbf) 1855 device->discipline->dump_sense_dbf(device, irb, "uc"); 1856 device->discipline->check_for_device_change(device, NULL, irb); 1857 dasd_put_device(device); 1858 out: 1859 return UC_TODO_RETRY; 1860 } 1861 EXPORT_SYMBOL_GPL(dasd_generic_uc_handler); 1862 1863 /* 1864 * If we have an error on a dasd_block layer request then we cancel 1865 * and return all further requests from the same dasd_block as well. 1866 */ 1867 static void __dasd_device_recovery(struct dasd_device *device, 1868 struct dasd_ccw_req *ref_cqr) 1869 { 1870 struct list_head *l, *n; 1871 struct dasd_ccw_req *cqr; 1872 1873 /* 1874 * only requeue request that came from the dasd_block layer 1875 */ 1876 if (!ref_cqr->block) 1877 return; 1878 1879 list_for_each_safe(l, n, &device->ccw_queue) { 1880 cqr = list_entry(l, struct dasd_ccw_req, devlist); 1881 if (cqr->status == DASD_CQR_QUEUED && 1882 ref_cqr->block == cqr->block) { 1883 cqr->status = DASD_CQR_CLEARED; 1884 } 1885 } 1886 }; 1887 1888 /* 1889 * Remove those ccw requests from the queue that need to be returned 1890 * to the upper layer. 1891 */ 1892 static void __dasd_device_process_ccw_queue(struct dasd_device *device, 1893 struct list_head *final_queue) 1894 { 1895 struct list_head *l, *n; 1896 struct dasd_ccw_req *cqr; 1897 1898 /* Process request with final status. */ 1899 list_for_each_safe(l, n, &device->ccw_queue) { 1900 cqr = list_entry(l, struct dasd_ccw_req, devlist); 1901 1902 /* Skip any non-final request. */ 1903 if (cqr->status == DASD_CQR_QUEUED || 1904 cqr->status == DASD_CQR_IN_IO || 1905 cqr->status == DASD_CQR_CLEAR_PENDING) 1906 continue; 1907 if (cqr->status == DASD_CQR_ERROR) { 1908 __dasd_device_recovery(device, cqr); 1909 } 1910 /* Rechain finished requests to final queue */ 1911 list_move_tail(&cqr->devlist, final_queue); 1912 } 1913 } 1914 1915 static void __dasd_process_cqr(struct dasd_device *device, 1916 struct dasd_ccw_req *cqr) 1917 { 1918 switch (cqr->status) { 1919 case DASD_CQR_SUCCESS: 1920 cqr->status = DASD_CQR_DONE; 1921 break; 1922 case DASD_CQR_ERROR: 1923 cqr->status = DASD_CQR_NEED_ERP; 1924 break; 1925 case DASD_CQR_CLEARED: 1926 cqr->status = DASD_CQR_TERMINATED; 1927 break; 1928 default: 1929 dev_err(&device->cdev->dev, 1930 "Unexpected CQR status %02x", cqr->status); 1931 BUG(); 1932 } 1933 if (cqr->callback) 1934 cqr->callback(cqr, cqr->callback_data); 1935 } 1936 1937 /* 1938 * the cqrs from the final queue are returned to the upper layer 1939 * by setting a dasd_block state and calling the callback function 1940 */ 1941 static void __dasd_device_process_final_queue(struct dasd_device *device, 1942 struct list_head *final_queue) 1943 { 1944 struct list_head *l, *n; 1945 struct dasd_ccw_req *cqr; 1946 struct dasd_block *block; 1947 1948 list_for_each_safe(l, n, final_queue) { 1949 cqr = list_entry(l, struct dasd_ccw_req, devlist); 1950 list_del_init(&cqr->devlist); 1951 block = cqr->block; 1952 if (!block) { 1953 __dasd_process_cqr(device, cqr); 1954 } else { 1955 spin_lock_bh(&block->queue_lock); 1956 __dasd_process_cqr(device, cqr); 1957 spin_unlock_bh(&block->queue_lock); 1958 } 1959 } 1960 } 1961 1962 /* 1963 * check if device should be autoquiesced due to too many timeouts 1964 */ 1965 static void __dasd_device_check_autoquiesce_timeout(struct dasd_device *device, 1966 struct dasd_ccw_req *cqr) 1967 { 1968 if ((device->default_retries - cqr->retries) >= device->aq_timeouts) 1969 dasd_handle_autoquiesce(device, cqr, DASD_EER_TIMEOUTS); 1970 } 1971 1972 /* 1973 * Take a look at the first request on the ccw queue and check 1974 * if it reached its expire time. If so, terminate the IO. 1975 */ 1976 static void __dasd_device_check_expire(struct dasd_device *device) 1977 { 1978 struct dasd_ccw_req *cqr; 1979 1980 if (list_empty(&device->ccw_queue)) 1981 return; 1982 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); 1983 if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) && 1984 (time_after_eq(jiffies, cqr->expires + cqr->starttime))) { 1985 if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { 1986 /* 1987 * IO in safe offline processing should not 1988 * run out of retries 1989 */ 1990 cqr->retries++; 1991 } 1992 if (device->discipline->term_IO(cqr) != 0) { 1993 /* Hmpf, try again in 5 sec */ 1994 dev_err(&device->cdev->dev, 1995 "CQR timed out (%lus) but cannot be ended, retrying in 5s\n", 1996 (cqr->expires / HZ)); 1997 cqr->expires += 5*HZ; 1998 dasd_device_set_timer(device, 5*HZ); 1999 } else { 2000 dev_err(&device->cdev->dev, 2001 "CQR timed out (%lus), %i retries remaining\n", 2002 (cqr->expires / HZ), cqr->retries); 2003 } 2004 __dasd_device_check_autoquiesce_timeout(device, cqr); 2005 } 2006 } 2007 2008 /* 2009 * return 1 when device is not eligible for IO 2010 */ 2011 static int __dasd_device_is_unusable(struct dasd_device *device, 2012 struct dasd_ccw_req *cqr) 2013 { 2014 int mask = ~(DASD_STOPPED_DC_WAIT | DASD_STOPPED_NOSPC); 2015 2016 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) && 2017 !test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { 2018 /* 2019 * dasd is being set offline 2020 * but it is no safe offline where we have to allow I/O 2021 */ 2022 return 1; 2023 } 2024 if (device->stopped) { 2025 if (device->stopped & mask) { 2026 /* stopped and CQR will not change that. */ 2027 return 1; 2028 } 2029 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { 2030 /* CQR is not able to change device to 2031 * operational. */ 2032 return 1; 2033 } 2034 /* CQR required to get device operational. */ 2035 } 2036 return 0; 2037 } 2038 2039 /* 2040 * Take a look at the first request on the ccw queue and check 2041 * if it needs to be started. 2042 */ 2043 static void __dasd_device_start_head(struct dasd_device *device) 2044 { 2045 struct dasd_ccw_req *cqr; 2046 int rc; 2047 2048 if (list_empty(&device->ccw_queue)) 2049 return; 2050 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); 2051 if (cqr->status != DASD_CQR_QUEUED) 2052 return; 2053 /* if device is not usable return request to upper layer */ 2054 if (__dasd_device_is_unusable(device, cqr)) { 2055 cqr->intrc = -EAGAIN; 2056 cqr->status = DASD_CQR_CLEARED; 2057 dasd_schedule_device_bh(device); 2058 return; 2059 } 2060 2061 rc = device->discipline->start_IO(cqr); 2062 if (rc == 0) 2063 dasd_device_set_timer(device, cqr->expires); 2064 else if (rc == -EACCES) { 2065 dasd_schedule_device_bh(device); 2066 } else 2067 /* Hmpf, try again in 1/2 sec */ 2068 dasd_device_set_timer(device, 50); 2069 } 2070 2071 static void __dasd_device_check_path_events(struct dasd_device *device) 2072 { 2073 __u8 tbvpm, fcsecpm; 2074 int rc; 2075 2076 tbvpm = dasd_path_get_tbvpm(device); 2077 fcsecpm = dasd_path_get_fcsecpm(device); 2078 2079 if (!tbvpm && !fcsecpm) 2080 return; 2081 2082 if (device->stopped & ~(DASD_STOPPED_DC_WAIT)) 2083 return; 2084 2085 dasd_path_clear_all_verify(device); 2086 dasd_path_clear_all_fcsec(device); 2087 2088 rc = device->discipline->pe_handler(device, tbvpm, fcsecpm); 2089 if (rc) { 2090 dasd_path_add_tbvpm(device, tbvpm); 2091 dasd_path_add_fcsecpm(device, fcsecpm); 2092 dasd_device_set_timer(device, 50); 2093 } 2094 }; 2095 2096 /* 2097 * Go through all request on the dasd_device request queue, 2098 * terminate them on the cdev if necessary, and return them to the 2099 * submitting layer via callback. 2100 * Note: 2101 * Make sure that all 'submitting layers' still exist when 2102 * this function is called!. In other words, when 'device' is a base 2103 * device then all block layer requests must have been removed before 2104 * via dasd_flush_block_queue. 2105 */ 2106 int dasd_flush_device_queue(struct dasd_device *device) 2107 { 2108 struct dasd_ccw_req *cqr, *n; 2109 int rc; 2110 struct list_head flush_queue; 2111 2112 INIT_LIST_HEAD(&flush_queue); 2113 spin_lock_irq(get_ccwdev_lock(device->cdev)); 2114 rc = 0; 2115 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { 2116 /* Check status and move request to flush_queue */ 2117 switch (cqr->status) { 2118 case DASD_CQR_IN_IO: 2119 rc = device->discipline->term_IO(cqr); 2120 if (rc) { 2121 /* unable to terminate request */ 2122 dev_err(&device->cdev->dev, 2123 "Flushing the DASD request queue failed\n"); 2124 /* stop flush processing */ 2125 goto finished; 2126 } 2127 break; 2128 case DASD_CQR_QUEUED: 2129 cqr->stopclk = get_tod_clock(); 2130 cqr->status = DASD_CQR_CLEARED; 2131 break; 2132 default: /* no need to modify the others */ 2133 break; 2134 } 2135 list_move_tail(&cqr->devlist, &flush_queue); 2136 } 2137 finished: 2138 spin_unlock_irq(get_ccwdev_lock(device->cdev)); 2139 /* 2140 * After this point all requests must be in state CLEAR_PENDING, 2141 * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become 2142 * one of the others. 2143 */ 2144 list_for_each_entry_safe(cqr, n, &flush_queue, devlist) 2145 wait_event(dasd_flush_wq, 2146 (cqr->status != DASD_CQR_CLEAR_PENDING)); 2147 /* 2148 * Now set each request back to TERMINATED, DONE or NEED_ERP 2149 * and call the callback function of flushed requests 2150 */ 2151 __dasd_device_process_final_queue(device, &flush_queue); 2152 return rc; 2153 } 2154 EXPORT_SYMBOL_GPL(dasd_flush_device_queue); 2155 2156 /* 2157 * Acquire the device lock and process queues for the device. 2158 */ 2159 static void dasd_device_tasklet(unsigned long data) 2160 { 2161 struct dasd_device *device = (struct dasd_device *) data; 2162 struct list_head final_queue; 2163 2164 atomic_set (&device->tasklet_scheduled, 0); 2165 INIT_LIST_HEAD(&final_queue); 2166 spin_lock_irq(get_ccwdev_lock(device->cdev)); 2167 /* Check expire time of first request on the ccw queue. */ 2168 __dasd_device_check_expire(device); 2169 /* find final requests on ccw queue */ 2170 __dasd_device_process_ccw_queue(device, &final_queue); 2171 __dasd_device_check_path_events(device); 2172 spin_unlock_irq(get_ccwdev_lock(device->cdev)); 2173 /* Now call the callback function of requests with final status */ 2174 __dasd_device_process_final_queue(device, &final_queue); 2175 spin_lock_irq(get_ccwdev_lock(device->cdev)); 2176 /* Now check if the head of the ccw queue needs to be started. */ 2177 __dasd_device_start_head(device); 2178 spin_unlock_irq(get_ccwdev_lock(device->cdev)); 2179 if (waitqueue_active(&shutdown_waitq)) 2180 wake_up(&shutdown_waitq); 2181 dasd_put_device(device); 2182 } 2183 2184 /* 2185 * Schedules a call to dasd_tasklet over the device tasklet. 2186 */ 2187 void dasd_schedule_device_bh(struct dasd_device *device) 2188 { 2189 /* Protect against rescheduling. */ 2190 if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0) 2191 return; 2192 dasd_get_device(device); 2193 tasklet_hi_schedule(&device->tasklet); 2194 } 2195 EXPORT_SYMBOL(dasd_schedule_device_bh); 2196 2197 void dasd_device_set_stop_bits(struct dasd_device *device, int bits) 2198 { 2199 device->stopped |= bits; 2200 } 2201 EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits); 2202 2203 void dasd_device_remove_stop_bits(struct dasd_device *device, int bits) 2204 { 2205 device->stopped &= ~bits; 2206 if (!device->stopped) 2207 wake_up(&generic_waitq); 2208 } 2209 EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits); 2210 2211 /* 2212 * Queue a request to the head of the device ccw_queue. 2213 * Start the I/O if possible. 2214 */ 2215 void dasd_add_request_head(struct dasd_ccw_req *cqr) 2216 { 2217 struct dasd_device *device; 2218 unsigned long flags; 2219 2220 device = cqr->startdev; 2221 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 2222 cqr->status = DASD_CQR_QUEUED; 2223 list_add(&cqr->devlist, &device->ccw_queue); 2224 /* let the bh start the request to keep them in order */ 2225 dasd_schedule_device_bh(device); 2226 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 2227 } 2228 EXPORT_SYMBOL(dasd_add_request_head); 2229 2230 /* 2231 * Queue a request to the tail of the device ccw_queue. 2232 * Start the I/O if possible. 2233 */ 2234 void dasd_add_request_tail(struct dasd_ccw_req *cqr) 2235 { 2236 struct dasd_device *device; 2237 unsigned long flags; 2238 2239 device = cqr->startdev; 2240 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 2241 cqr->status = DASD_CQR_QUEUED; 2242 list_add_tail(&cqr->devlist, &device->ccw_queue); 2243 /* let the bh start the request to keep them in order */ 2244 dasd_schedule_device_bh(device); 2245 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 2246 } 2247 EXPORT_SYMBOL(dasd_add_request_tail); 2248 2249 /* 2250 * Wakeup helper for the 'sleep_on' functions. 2251 */ 2252 void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data) 2253 { 2254 spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev)); 2255 cqr->callback_data = DASD_SLEEPON_END_TAG; 2256 spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev)); 2257 wake_up(&generic_waitq); 2258 } 2259 EXPORT_SYMBOL_GPL(dasd_wakeup_cb); 2260 2261 static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr) 2262 { 2263 struct dasd_device *device; 2264 int rc; 2265 2266 device = cqr->startdev; 2267 spin_lock_irq(get_ccwdev_lock(device->cdev)); 2268 rc = (cqr->callback_data == DASD_SLEEPON_END_TAG); 2269 spin_unlock_irq(get_ccwdev_lock(device->cdev)); 2270 return rc; 2271 } 2272 2273 /* 2274 * checks if error recovery is necessary, returns 1 if yes, 0 otherwise. 2275 */ 2276 static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr) 2277 { 2278 struct dasd_device *device; 2279 dasd_erp_fn_t erp_fn; 2280 2281 if (cqr->status == DASD_CQR_FILLED) 2282 return 0; 2283 device = cqr->startdev; 2284 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) { 2285 if (cqr->status == DASD_CQR_TERMINATED) { 2286 device->discipline->handle_terminated_request(cqr); 2287 return 1; 2288 } 2289 if (cqr->status == DASD_CQR_NEED_ERP) { 2290 erp_fn = device->discipline->erp_action(cqr); 2291 erp_fn(cqr); 2292 return 1; 2293 } 2294 if (cqr->status == DASD_CQR_FAILED) 2295 dasd_log_sense(cqr, &cqr->irb); 2296 if (cqr->refers) { 2297 __dasd_process_erp(device, cqr); 2298 return 1; 2299 } 2300 } 2301 return 0; 2302 } 2303 2304 static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr) 2305 { 2306 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) { 2307 if (cqr->refers) /* erp is not done yet */ 2308 return 1; 2309 return ((cqr->status != DASD_CQR_DONE) && 2310 (cqr->status != DASD_CQR_FAILED)); 2311 } else 2312 return (cqr->status == DASD_CQR_FILLED); 2313 } 2314 2315 static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible) 2316 { 2317 struct dasd_device *device; 2318 int rc; 2319 struct list_head ccw_queue; 2320 struct dasd_ccw_req *cqr; 2321 2322 INIT_LIST_HEAD(&ccw_queue); 2323 maincqr->status = DASD_CQR_FILLED; 2324 device = maincqr->startdev; 2325 list_add(&maincqr->blocklist, &ccw_queue); 2326 for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr); 2327 cqr = list_first_entry(&ccw_queue, 2328 struct dasd_ccw_req, blocklist)) { 2329 2330 if (__dasd_sleep_on_erp(cqr)) 2331 continue; 2332 if (cqr->status != DASD_CQR_FILLED) /* could be failed */ 2333 continue; 2334 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) && 2335 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { 2336 cqr->status = DASD_CQR_FAILED; 2337 cqr->intrc = -EPERM; 2338 continue; 2339 } 2340 /* Non-temporary stop condition will trigger fail fast */ 2341 if (device->stopped & ~DASD_STOPPED_PENDING && 2342 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && 2343 !dasd_eer_enabled(device) && device->aq_mask == 0) { 2344 cqr->status = DASD_CQR_FAILED; 2345 cqr->intrc = -ENOLINK; 2346 continue; 2347 } 2348 /* 2349 * Don't try to start requests if device is in 2350 * offline processing, it might wait forever 2351 */ 2352 if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) { 2353 cqr->status = DASD_CQR_FAILED; 2354 cqr->intrc = -ENODEV; 2355 continue; 2356 } 2357 /* 2358 * Don't try to start requests if device is stopped 2359 * except path verification requests 2360 */ 2361 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { 2362 if (interruptible) { 2363 rc = wait_event_interruptible( 2364 generic_waitq, !(device->stopped)); 2365 if (rc == -ERESTARTSYS) { 2366 cqr->status = DASD_CQR_FAILED; 2367 maincqr->intrc = rc; 2368 continue; 2369 } 2370 } else 2371 wait_event(generic_waitq, !(device->stopped)); 2372 } 2373 if (!cqr->callback) 2374 cqr->callback = dasd_wakeup_cb; 2375 2376 cqr->callback_data = DASD_SLEEPON_START_TAG; 2377 dasd_add_request_tail(cqr); 2378 if (interruptible) { 2379 rc = wait_event_interruptible( 2380 generic_waitq, _wait_for_wakeup(cqr)); 2381 if (rc == -ERESTARTSYS) { 2382 dasd_cancel_req(cqr); 2383 /* wait (non-interruptible) for final status */ 2384 wait_event(generic_waitq, 2385 _wait_for_wakeup(cqr)); 2386 cqr->status = DASD_CQR_FAILED; 2387 maincqr->intrc = rc; 2388 continue; 2389 } 2390 } else 2391 wait_event(generic_waitq, _wait_for_wakeup(cqr)); 2392 } 2393 2394 maincqr->endclk = get_tod_clock(); 2395 if ((maincqr->status != DASD_CQR_DONE) && 2396 (maincqr->intrc != -ERESTARTSYS)) 2397 dasd_log_sense(maincqr, &maincqr->irb); 2398 if (maincqr->status == DASD_CQR_DONE) 2399 rc = 0; 2400 else if (maincqr->intrc) 2401 rc = maincqr->intrc; 2402 else 2403 rc = -EIO; 2404 return rc; 2405 } 2406 2407 static inline int _wait_for_wakeup_queue(struct list_head *ccw_queue) 2408 { 2409 struct dasd_ccw_req *cqr; 2410 2411 list_for_each_entry(cqr, ccw_queue, blocklist) { 2412 if (cqr->callback_data != DASD_SLEEPON_END_TAG) 2413 return 0; 2414 } 2415 2416 return 1; 2417 } 2418 2419 static int _dasd_sleep_on_queue(struct list_head *ccw_queue, int interruptible) 2420 { 2421 struct dasd_device *device; 2422 struct dasd_ccw_req *cqr, *n; 2423 u8 *sense = NULL; 2424 int rc; 2425 2426 retry: 2427 list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) { 2428 device = cqr->startdev; 2429 if (cqr->status != DASD_CQR_FILLED) /*could be failed*/ 2430 continue; 2431 2432 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) && 2433 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { 2434 cqr->status = DASD_CQR_FAILED; 2435 cqr->intrc = -EPERM; 2436 continue; 2437 } 2438 /*Non-temporary stop condition will trigger fail fast*/ 2439 if (device->stopped & ~DASD_STOPPED_PENDING && 2440 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && 2441 !dasd_eer_enabled(device)) { 2442 cqr->status = DASD_CQR_FAILED; 2443 cqr->intrc = -EAGAIN; 2444 continue; 2445 } 2446 2447 /*Don't try to start requests if device is stopped*/ 2448 if (interruptible) { 2449 rc = wait_event_interruptible( 2450 generic_waitq, !device->stopped); 2451 if (rc == -ERESTARTSYS) { 2452 cqr->status = DASD_CQR_FAILED; 2453 cqr->intrc = rc; 2454 continue; 2455 } 2456 } else 2457 wait_event(generic_waitq, !(device->stopped)); 2458 2459 if (!cqr->callback) 2460 cqr->callback = dasd_wakeup_cb; 2461 cqr->callback_data = DASD_SLEEPON_START_TAG; 2462 dasd_add_request_tail(cqr); 2463 } 2464 2465 wait_event(generic_waitq, _wait_for_wakeup_queue(ccw_queue)); 2466 2467 rc = 0; 2468 list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) { 2469 /* 2470 * In some cases certain errors might be expected and 2471 * error recovery would be unnecessary in these cases. 2472 * Check if the according suppress bit is set. 2473 */ 2474 sense = dasd_get_sense(&cqr->irb); 2475 if (sense && (sense[1] & SNS1_INV_TRACK_FORMAT) && 2476 !(sense[2] & SNS2_ENV_DATA_PRESENT) && 2477 test_bit(DASD_CQR_SUPPRESS_IT, &cqr->flags)) 2478 continue; 2479 if (sense && (sense[1] & SNS1_NO_REC_FOUND) && 2480 test_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags)) 2481 continue; 2482 if (scsw_cstat(&cqr->irb.scsw) == 0x40 && 2483 test_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags)) 2484 continue; 2485 2486 /* 2487 * for alias devices simplify error recovery and 2488 * return to upper layer 2489 * do not skip ERP requests 2490 */ 2491 if (cqr->startdev != cqr->basedev && !cqr->refers && 2492 (cqr->status == DASD_CQR_TERMINATED || 2493 cqr->status == DASD_CQR_NEED_ERP)) 2494 return -EAGAIN; 2495 2496 /* normal recovery for basedev IO */ 2497 if (__dasd_sleep_on_erp(cqr)) 2498 /* handle erp first */ 2499 goto retry; 2500 } 2501 2502 return 0; 2503 } 2504 2505 /* 2506 * Queue a request to the tail of the device ccw_queue and wait for 2507 * it's completion. 2508 */ 2509 int dasd_sleep_on(struct dasd_ccw_req *cqr) 2510 { 2511 return _dasd_sleep_on(cqr, 0); 2512 } 2513 EXPORT_SYMBOL(dasd_sleep_on); 2514 2515 /* 2516 * Start requests from a ccw_queue and wait for their completion. 2517 */ 2518 int dasd_sleep_on_queue(struct list_head *ccw_queue) 2519 { 2520 return _dasd_sleep_on_queue(ccw_queue, 0); 2521 } 2522 EXPORT_SYMBOL(dasd_sleep_on_queue); 2523 2524 /* 2525 * Start requests from a ccw_queue and wait interruptible for their completion. 2526 */ 2527 int dasd_sleep_on_queue_interruptible(struct list_head *ccw_queue) 2528 { 2529 return _dasd_sleep_on_queue(ccw_queue, 1); 2530 } 2531 EXPORT_SYMBOL(dasd_sleep_on_queue_interruptible); 2532 2533 /* 2534 * Queue a request to the tail of the device ccw_queue and wait 2535 * interruptible for it's completion. 2536 */ 2537 int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr) 2538 { 2539 return _dasd_sleep_on(cqr, 1); 2540 } 2541 EXPORT_SYMBOL(dasd_sleep_on_interruptible); 2542 2543 /* 2544 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock 2545 * for eckd devices) the currently running request has to be terminated 2546 * and be put back to status queued, before the special request is added 2547 * to the head of the queue. Then the special request is waited on normally. 2548 */ 2549 static inline int _dasd_term_running_cqr(struct dasd_device *device) 2550 { 2551 struct dasd_ccw_req *cqr; 2552 int rc; 2553 2554 if (list_empty(&device->ccw_queue)) 2555 return 0; 2556 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); 2557 rc = device->discipline->term_IO(cqr); 2558 if (!rc) 2559 /* 2560 * CQR terminated because a more important request is pending. 2561 * Undo decreasing of retry counter because this is 2562 * not an error case. 2563 */ 2564 cqr->retries++; 2565 return rc; 2566 } 2567 2568 int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr) 2569 { 2570 struct dasd_device *device; 2571 int rc; 2572 2573 device = cqr->startdev; 2574 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) && 2575 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { 2576 cqr->status = DASD_CQR_FAILED; 2577 cqr->intrc = -EPERM; 2578 return -EIO; 2579 } 2580 spin_lock_irq(get_ccwdev_lock(device->cdev)); 2581 rc = _dasd_term_running_cqr(device); 2582 if (rc) { 2583 spin_unlock_irq(get_ccwdev_lock(device->cdev)); 2584 return rc; 2585 } 2586 cqr->callback = dasd_wakeup_cb; 2587 cqr->callback_data = DASD_SLEEPON_START_TAG; 2588 cqr->status = DASD_CQR_QUEUED; 2589 /* 2590 * add new request as second 2591 * first the terminated cqr needs to be finished 2592 */ 2593 list_add(&cqr->devlist, device->ccw_queue.next); 2594 2595 /* let the bh start the request to keep them in order */ 2596 dasd_schedule_device_bh(device); 2597 2598 spin_unlock_irq(get_ccwdev_lock(device->cdev)); 2599 2600 wait_event(generic_waitq, _wait_for_wakeup(cqr)); 2601 2602 if (cqr->status == DASD_CQR_DONE) 2603 rc = 0; 2604 else if (cqr->intrc) 2605 rc = cqr->intrc; 2606 else 2607 rc = -EIO; 2608 2609 /* kick tasklets */ 2610 dasd_schedule_device_bh(device); 2611 if (device->block) 2612 dasd_schedule_block_bh(device->block); 2613 2614 return rc; 2615 } 2616 EXPORT_SYMBOL(dasd_sleep_on_immediatly); 2617 2618 /* 2619 * Cancels a request that was started with dasd_sleep_on_req. 2620 * This is useful to timeout requests. The request will be 2621 * terminated if it is currently in i/o. 2622 * Returns 0 if request termination was successful 2623 * negative error code if termination failed 2624 * Cancellation of a request is an asynchronous operation! The calling 2625 * function has to wait until the request is properly returned via callback. 2626 */ 2627 static int __dasd_cancel_req(struct dasd_ccw_req *cqr) 2628 { 2629 struct dasd_device *device = cqr->startdev; 2630 int rc = 0; 2631 2632 switch (cqr->status) { 2633 case DASD_CQR_QUEUED: 2634 /* request was not started - just set to cleared */ 2635 cqr->status = DASD_CQR_CLEARED; 2636 break; 2637 case DASD_CQR_IN_IO: 2638 /* request in IO - terminate IO and release again */ 2639 rc = device->discipline->term_IO(cqr); 2640 if (rc) { 2641 dev_err(&device->cdev->dev, 2642 "Cancelling request failed with rc=%d\n", rc); 2643 } else { 2644 cqr->stopclk = get_tod_clock(); 2645 } 2646 break; 2647 default: /* already finished or clear pending - do nothing */ 2648 break; 2649 } 2650 dasd_schedule_device_bh(device); 2651 return rc; 2652 } 2653 2654 int dasd_cancel_req(struct dasd_ccw_req *cqr) 2655 { 2656 struct dasd_device *device = cqr->startdev; 2657 unsigned long flags; 2658 int rc; 2659 2660 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 2661 rc = __dasd_cancel_req(cqr); 2662 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 2663 return rc; 2664 } 2665 2666 /* 2667 * SECTION: Operations of the dasd_block layer. 2668 */ 2669 2670 /* 2671 * Timeout function for dasd_block. This is used when the block layer 2672 * is waiting for something that may not come reliably, (e.g. a state 2673 * change interrupt) 2674 */ 2675 static void dasd_block_timeout(struct timer_list *t) 2676 { 2677 unsigned long flags; 2678 struct dasd_block *block; 2679 2680 block = from_timer(block, t, timer); 2681 spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags); 2682 /* re-activate request queue */ 2683 dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING); 2684 spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags); 2685 dasd_schedule_block_bh(block); 2686 blk_mq_run_hw_queues(block->gdp->queue, true); 2687 } 2688 2689 /* 2690 * Setup timeout for a dasd_block in jiffies. 2691 */ 2692 void dasd_block_set_timer(struct dasd_block *block, int expires) 2693 { 2694 if (expires == 0) 2695 del_timer(&block->timer); 2696 else 2697 mod_timer(&block->timer, jiffies + expires); 2698 } 2699 EXPORT_SYMBOL(dasd_block_set_timer); 2700 2701 /* 2702 * Clear timeout for a dasd_block. 2703 */ 2704 void dasd_block_clear_timer(struct dasd_block *block) 2705 { 2706 del_timer(&block->timer); 2707 } 2708 EXPORT_SYMBOL(dasd_block_clear_timer); 2709 2710 /* 2711 * Process finished error recovery ccw. 2712 */ 2713 static void __dasd_process_erp(struct dasd_device *device, 2714 struct dasd_ccw_req *cqr) 2715 { 2716 dasd_erp_fn_t erp_fn; 2717 2718 if (cqr->status == DASD_CQR_DONE) 2719 DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful"); 2720 else 2721 dev_err(&device->cdev->dev, "ERP failed for the DASD\n"); 2722 erp_fn = device->discipline->erp_postaction(cqr); 2723 erp_fn(cqr); 2724 } 2725 2726 static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr) 2727 { 2728 struct request *req; 2729 blk_status_t error = BLK_STS_OK; 2730 unsigned int proc_bytes; 2731 int status; 2732 2733 req = (struct request *) cqr->callback_data; 2734 dasd_profile_end(cqr->block, cqr, req); 2735 2736 proc_bytes = cqr->proc_bytes; 2737 status = cqr->block->base->discipline->free_cp(cqr, req); 2738 if (status < 0) 2739 error = errno_to_blk_status(status); 2740 else if (status == 0) { 2741 switch (cqr->intrc) { 2742 case -EPERM: 2743 /* 2744 * DASD doesn't implement SCSI/NVMe reservations, but it 2745 * implements a locking scheme similar to them. We 2746 * return this error when we no longer have the lock. 2747 */ 2748 error = BLK_STS_RESV_CONFLICT; 2749 break; 2750 case -ENOLINK: 2751 error = BLK_STS_TRANSPORT; 2752 break; 2753 case -ETIMEDOUT: 2754 error = BLK_STS_TIMEOUT; 2755 break; 2756 default: 2757 error = BLK_STS_IOERR; 2758 break; 2759 } 2760 } 2761 2762 /* 2763 * We need to take care for ETIMEDOUT errors here since the 2764 * complete callback does not get called in this case. 2765 * Take care of all errors here and avoid additional code to 2766 * transfer the error value to the complete callback. 2767 */ 2768 if (error) { 2769 blk_mq_end_request(req, error); 2770 blk_mq_run_hw_queues(req->q, true); 2771 } else { 2772 /* 2773 * Partial completed requests can happen with ESE devices. 2774 * During read we might have gotten a NRF error and have to 2775 * complete a request partially. 2776 */ 2777 if (proc_bytes) { 2778 blk_update_request(req, BLK_STS_OK, proc_bytes); 2779 blk_mq_requeue_request(req, true); 2780 } else if (likely(!blk_should_fake_timeout(req->q))) { 2781 blk_mq_complete_request(req); 2782 } 2783 } 2784 } 2785 2786 /* 2787 * Process ccw request queue. 2788 */ 2789 static void __dasd_process_block_ccw_queue(struct dasd_block *block, 2790 struct list_head *final_queue) 2791 { 2792 struct list_head *l, *n; 2793 struct dasd_ccw_req *cqr; 2794 dasd_erp_fn_t erp_fn; 2795 unsigned long flags; 2796 struct dasd_device *base = block->base; 2797 2798 restart: 2799 /* Process request with final status. */ 2800 list_for_each_safe(l, n, &block->ccw_queue) { 2801 cqr = list_entry(l, struct dasd_ccw_req, blocklist); 2802 if (cqr->status != DASD_CQR_DONE && 2803 cqr->status != DASD_CQR_FAILED && 2804 cqr->status != DASD_CQR_NEED_ERP && 2805 cqr->status != DASD_CQR_TERMINATED) 2806 continue; 2807 2808 if (cqr->status == DASD_CQR_TERMINATED) { 2809 base->discipline->handle_terminated_request(cqr); 2810 goto restart; 2811 } 2812 2813 /* Process requests that may be recovered */ 2814 if (cqr->status == DASD_CQR_NEED_ERP) { 2815 erp_fn = base->discipline->erp_action(cqr); 2816 if (IS_ERR(erp_fn(cqr))) 2817 continue; 2818 goto restart; 2819 } 2820 2821 /* log sense for fatal error */ 2822 if (cqr->status == DASD_CQR_FAILED) { 2823 dasd_log_sense(cqr, &cqr->irb); 2824 } 2825 2826 /* 2827 * First call extended error reporting and check for autoquiesce 2828 */ 2829 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); 2830 if (cqr->status == DASD_CQR_FAILED && 2831 dasd_handle_autoquiesce(base, cqr, DASD_EER_FATALERROR)) { 2832 cqr->status = DASD_CQR_FILLED; 2833 cqr->retries = 255; 2834 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags); 2835 goto restart; 2836 } 2837 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags); 2838 2839 /* Process finished ERP request. */ 2840 if (cqr->refers) { 2841 __dasd_process_erp(base, cqr); 2842 goto restart; 2843 } 2844 2845 /* Rechain finished requests to final queue */ 2846 cqr->endclk = get_tod_clock(); 2847 list_move_tail(&cqr->blocklist, final_queue); 2848 } 2849 } 2850 2851 static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data) 2852 { 2853 dasd_schedule_block_bh(cqr->block); 2854 } 2855 2856 static void __dasd_block_start_head(struct dasd_block *block) 2857 { 2858 struct dasd_ccw_req *cqr; 2859 2860 if (list_empty(&block->ccw_queue)) 2861 return; 2862 /* We allways begin with the first requests on the queue, as some 2863 * of previously started requests have to be enqueued on a 2864 * dasd_device again for error recovery. 2865 */ 2866 list_for_each_entry(cqr, &block->ccw_queue, blocklist) { 2867 if (cqr->status != DASD_CQR_FILLED) 2868 continue; 2869 if (test_bit(DASD_FLAG_LOCK_STOLEN, &block->base->flags) && 2870 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { 2871 cqr->status = DASD_CQR_FAILED; 2872 cqr->intrc = -EPERM; 2873 dasd_schedule_block_bh(block); 2874 continue; 2875 } 2876 /* Non-temporary stop condition will trigger fail fast */ 2877 if (block->base->stopped & ~DASD_STOPPED_PENDING && 2878 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && 2879 !dasd_eer_enabled(block->base) && block->base->aq_mask == 0) { 2880 cqr->status = DASD_CQR_FAILED; 2881 cqr->intrc = -ENOLINK; 2882 dasd_schedule_block_bh(block); 2883 continue; 2884 } 2885 /* Don't try to start requests if device is stopped */ 2886 if (block->base->stopped) 2887 return; 2888 2889 /* just a fail safe check, should not happen */ 2890 if (!cqr->startdev) 2891 cqr->startdev = block->base; 2892 2893 /* make sure that the requests we submit find their way back */ 2894 cqr->callback = dasd_return_cqr_cb; 2895 2896 dasd_add_request_tail(cqr); 2897 } 2898 } 2899 2900 /* 2901 * Central dasd_block layer routine. Takes requests from the generic 2902 * block layer request queue, creates ccw requests, enqueues them on 2903 * a dasd_device and processes ccw requests that have been returned. 2904 */ 2905 static void dasd_block_tasklet(unsigned long data) 2906 { 2907 struct dasd_block *block = (struct dasd_block *) data; 2908 struct list_head final_queue; 2909 struct list_head *l, *n; 2910 struct dasd_ccw_req *cqr; 2911 struct dasd_queue *dq; 2912 2913 atomic_set(&block->tasklet_scheduled, 0); 2914 INIT_LIST_HEAD(&final_queue); 2915 spin_lock_irq(&block->queue_lock); 2916 /* Finish off requests on ccw queue */ 2917 __dasd_process_block_ccw_queue(block, &final_queue); 2918 spin_unlock_irq(&block->queue_lock); 2919 2920 /* Now call the callback function of requests with final status */ 2921 list_for_each_safe(l, n, &final_queue) { 2922 cqr = list_entry(l, struct dasd_ccw_req, blocklist); 2923 dq = cqr->dq; 2924 spin_lock_irq(&dq->lock); 2925 list_del_init(&cqr->blocklist); 2926 __dasd_cleanup_cqr(cqr); 2927 spin_unlock_irq(&dq->lock); 2928 } 2929 2930 spin_lock_irq(&block->queue_lock); 2931 /* Now check if the head of the ccw queue needs to be started. */ 2932 __dasd_block_start_head(block); 2933 spin_unlock_irq(&block->queue_lock); 2934 2935 if (waitqueue_active(&shutdown_waitq)) 2936 wake_up(&shutdown_waitq); 2937 dasd_put_device(block->base); 2938 } 2939 2940 static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data) 2941 { 2942 wake_up(&dasd_flush_wq); 2943 } 2944 2945 /* 2946 * Requeue a request back to the block request queue 2947 * only works for block requests 2948 */ 2949 static void _dasd_requeue_request(struct dasd_ccw_req *cqr) 2950 { 2951 struct request *req; 2952 2953 /* 2954 * If the request is an ERP request there is nothing to requeue. 2955 * This will be done with the remaining original request. 2956 */ 2957 if (cqr->refers) 2958 return; 2959 spin_lock_irq(&cqr->dq->lock); 2960 req = (struct request *) cqr->callback_data; 2961 blk_mq_requeue_request(req, true); 2962 spin_unlock_irq(&cqr->dq->lock); 2963 2964 return; 2965 } 2966 2967 static int _dasd_requests_to_flushqueue(struct dasd_block *block, 2968 struct list_head *flush_queue) 2969 { 2970 struct dasd_ccw_req *cqr, *n; 2971 unsigned long flags; 2972 int rc, i; 2973 2974 spin_lock_irqsave(&block->queue_lock, flags); 2975 rc = 0; 2976 restart: 2977 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) { 2978 /* if this request currently owned by a dasd_device cancel it */ 2979 if (cqr->status >= DASD_CQR_QUEUED) 2980 rc = dasd_cancel_req(cqr); 2981 if (rc < 0) 2982 break; 2983 /* Rechain request (including erp chain) so it won't be 2984 * touched by the dasd_block_tasklet anymore. 2985 * Replace the callback so we notice when the request 2986 * is returned from the dasd_device layer. 2987 */ 2988 cqr->callback = _dasd_wake_block_flush_cb; 2989 for (i = 0; cqr; cqr = cqr->refers, i++) 2990 list_move_tail(&cqr->blocklist, flush_queue); 2991 if (i > 1) 2992 /* moved more than one request - need to restart */ 2993 goto restart; 2994 } 2995 spin_unlock_irqrestore(&block->queue_lock, flags); 2996 2997 return rc; 2998 } 2999 3000 /* 3001 * Go through all request on the dasd_block request queue, cancel them 3002 * on the respective dasd_device, and return them to the generic 3003 * block layer. 3004 */ 3005 static int dasd_flush_block_queue(struct dasd_block *block) 3006 { 3007 struct dasd_ccw_req *cqr, *n; 3008 struct list_head flush_queue; 3009 unsigned long flags; 3010 int rc; 3011 3012 INIT_LIST_HEAD(&flush_queue); 3013 rc = _dasd_requests_to_flushqueue(block, &flush_queue); 3014 3015 /* Now call the callback function of flushed requests */ 3016 restart_cb: 3017 list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) { 3018 wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED)); 3019 /* Process finished ERP request. */ 3020 if (cqr->refers) { 3021 spin_lock_bh(&block->queue_lock); 3022 __dasd_process_erp(block->base, cqr); 3023 spin_unlock_bh(&block->queue_lock); 3024 /* restart list_for_xx loop since dasd_process_erp 3025 * might remove multiple elements */ 3026 goto restart_cb; 3027 } 3028 /* call the callback function */ 3029 spin_lock_irqsave(&cqr->dq->lock, flags); 3030 cqr->endclk = get_tod_clock(); 3031 list_del_init(&cqr->blocklist); 3032 __dasd_cleanup_cqr(cqr); 3033 spin_unlock_irqrestore(&cqr->dq->lock, flags); 3034 } 3035 return rc; 3036 } 3037 3038 /* 3039 * Schedules a call to dasd_tasklet over the device tasklet. 3040 */ 3041 void dasd_schedule_block_bh(struct dasd_block *block) 3042 { 3043 /* Protect against rescheduling. */ 3044 if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0) 3045 return; 3046 /* life cycle of block is bound to it's base device */ 3047 dasd_get_device(block->base); 3048 tasklet_hi_schedule(&block->tasklet); 3049 } 3050 EXPORT_SYMBOL(dasd_schedule_block_bh); 3051 3052 3053 /* 3054 * SECTION: external block device operations 3055 * (request queue handling, open, release, etc.) 3056 */ 3057 3058 /* 3059 * Dasd request queue function. Called from ll_rw_blk.c 3060 */ 3061 static blk_status_t do_dasd_request(struct blk_mq_hw_ctx *hctx, 3062 const struct blk_mq_queue_data *qd) 3063 { 3064 struct dasd_block *block = hctx->queue->queuedata; 3065 struct dasd_queue *dq = hctx->driver_data; 3066 struct request *req = qd->rq; 3067 struct dasd_device *basedev; 3068 struct dasd_ccw_req *cqr; 3069 blk_status_t rc = BLK_STS_OK; 3070 3071 basedev = block->base; 3072 spin_lock_irq(&dq->lock); 3073 if (basedev->state < DASD_STATE_READY || 3074 test_bit(DASD_FLAG_OFFLINE, &basedev->flags)) { 3075 DBF_DEV_EVENT(DBF_ERR, basedev, 3076 "device not ready for request %p", req); 3077 rc = BLK_STS_IOERR; 3078 goto out; 3079 } 3080 3081 /* 3082 * if device is stopped do not fetch new requests 3083 * except failfast is active which will let requests fail 3084 * immediately in __dasd_block_start_head() 3085 */ 3086 if (basedev->stopped && !(basedev->features & DASD_FEATURE_FAILFAST)) { 3087 DBF_DEV_EVENT(DBF_ERR, basedev, 3088 "device stopped request %p", req); 3089 rc = BLK_STS_RESOURCE; 3090 goto out; 3091 } 3092 3093 if (basedev->features & DASD_FEATURE_READONLY && 3094 rq_data_dir(req) == WRITE) { 3095 DBF_DEV_EVENT(DBF_ERR, basedev, 3096 "Rejecting write request %p", req); 3097 rc = BLK_STS_IOERR; 3098 goto out; 3099 } 3100 3101 if (test_bit(DASD_FLAG_ABORTALL, &basedev->flags) && 3102 (basedev->features & DASD_FEATURE_FAILFAST || 3103 blk_noretry_request(req))) { 3104 DBF_DEV_EVENT(DBF_ERR, basedev, 3105 "Rejecting failfast request %p", req); 3106 rc = BLK_STS_IOERR; 3107 goto out; 3108 } 3109 3110 cqr = basedev->discipline->build_cp(basedev, block, req); 3111 if (IS_ERR(cqr)) { 3112 if (PTR_ERR(cqr) == -EBUSY || 3113 PTR_ERR(cqr) == -ENOMEM || 3114 PTR_ERR(cqr) == -EAGAIN) { 3115 rc = BLK_STS_RESOURCE; 3116 goto out; 3117 } 3118 DBF_DEV_EVENT(DBF_ERR, basedev, 3119 "CCW creation failed (rc=%ld) on request %p", 3120 PTR_ERR(cqr), req); 3121 rc = BLK_STS_IOERR; 3122 goto out; 3123 } 3124 /* 3125 * Note: callback is set to dasd_return_cqr_cb in 3126 * __dasd_block_start_head to cover erp requests as well 3127 */ 3128 cqr->callback_data = req; 3129 cqr->status = DASD_CQR_FILLED; 3130 cqr->dq = dq; 3131 3132 blk_mq_start_request(req); 3133 spin_lock(&block->queue_lock); 3134 list_add_tail(&cqr->blocklist, &block->ccw_queue); 3135 INIT_LIST_HEAD(&cqr->devlist); 3136 dasd_profile_start(block, cqr, req); 3137 dasd_schedule_block_bh(block); 3138 spin_unlock(&block->queue_lock); 3139 3140 out: 3141 spin_unlock_irq(&dq->lock); 3142 return rc; 3143 } 3144 3145 /* 3146 * Block timeout callback, called from the block layer 3147 * 3148 * Return values: 3149 * BLK_EH_RESET_TIMER if the request should be left running 3150 * BLK_EH_DONE if the request is handled or terminated 3151 * by the driver. 3152 */ 3153 enum blk_eh_timer_return dasd_times_out(struct request *req) 3154 { 3155 struct dasd_block *block = req->q->queuedata; 3156 struct dasd_device *device; 3157 struct dasd_ccw_req *cqr; 3158 unsigned long flags; 3159 int rc = 0; 3160 3161 cqr = blk_mq_rq_to_pdu(req); 3162 if (!cqr) 3163 return BLK_EH_DONE; 3164 3165 spin_lock_irqsave(&cqr->dq->lock, flags); 3166 device = cqr->startdev ? cqr->startdev : block->base; 3167 if (!device->blk_timeout) { 3168 spin_unlock_irqrestore(&cqr->dq->lock, flags); 3169 return BLK_EH_RESET_TIMER; 3170 } 3171 DBF_DEV_EVENT(DBF_WARNING, device, 3172 " dasd_times_out cqr %p status %x", 3173 cqr, cqr->status); 3174 3175 spin_lock(&block->queue_lock); 3176 spin_lock(get_ccwdev_lock(device->cdev)); 3177 cqr->retries = -1; 3178 cqr->intrc = -ETIMEDOUT; 3179 if (cqr->status >= DASD_CQR_QUEUED) { 3180 rc = __dasd_cancel_req(cqr); 3181 } else if (cqr->status == DASD_CQR_FILLED || 3182 cqr->status == DASD_CQR_NEED_ERP) { 3183 cqr->status = DASD_CQR_TERMINATED; 3184 } else if (cqr->status == DASD_CQR_IN_ERP) { 3185 struct dasd_ccw_req *searchcqr, *nextcqr, *tmpcqr; 3186 3187 list_for_each_entry_safe(searchcqr, nextcqr, 3188 &block->ccw_queue, blocklist) { 3189 tmpcqr = searchcqr; 3190 while (tmpcqr->refers) 3191 tmpcqr = tmpcqr->refers; 3192 if (tmpcqr != cqr) 3193 continue; 3194 /* searchcqr is an ERP request for cqr */ 3195 searchcqr->retries = -1; 3196 searchcqr->intrc = -ETIMEDOUT; 3197 if (searchcqr->status >= DASD_CQR_QUEUED) { 3198 rc = __dasd_cancel_req(searchcqr); 3199 } else if ((searchcqr->status == DASD_CQR_FILLED) || 3200 (searchcqr->status == DASD_CQR_NEED_ERP)) { 3201 searchcqr->status = DASD_CQR_TERMINATED; 3202 rc = 0; 3203 } else if (searchcqr->status == DASD_CQR_IN_ERP) { 3204 /* 3205 * Shouldn't happen; most recent ERP 3206 * request is at the front of queue 3207 */ 3208 continue; 3209 } 3210 break; 3211 } 3212 } 3213 spin_unlock(get_ccwdev_lock(device->cdev)); 3214 dasd_schedule_block_bh(block); 3215 spin_unlock(&block->queue_lock); 3216 spin_unlock_irqrestore(&cqr->dq->lock, flags); 3217 3218 return rc ? BLK_EH_RESET_TIMER : BLK_EH_DONE; 3219 } 3220 3221 static int dasd_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, 3222 unsigned int idx) 3223 { 3224 struct dasd_queue *dq = kzalloc(sizeof(*dq), GFP_KERNEL); 3225 3226 if (!dq) 3227 return -ENOMEM; 3228 3229 spin_lock_init(&dq->lock); 3230 hctx->driver_data = dq; 3231 3232 return 0; 3233 } 3234 3235 static void dasd_exit_hctx(struct blk_mq_hw_ctx *hctx, unsigned int idx) 3236 { 3237 kfree(hctx->driver_data); 3238 hctx->driver_data = NULL; 3239 } 3240 3241 static void dasd_request_done(struct request *req) 3242 { 3243 blk_mq_end_request(req, 0); 3244 blk_mq_run_hw_queues(req->q, true); 3245 } 3246 3247 struct blk_mq_ops dasd_mq_ops = { 3248 .queue_rq = do_dasd_request, 3249 .complete = dasd_request_done, 3250 .timeout = dasd_times_out, 3251 .init_hctx = dasd_init_hctx, 3252 .exit_hctx = dasd_exit_hctx, 3253 }; 3254 3255 static int dasd_open(struct gendisk *disk, blk_mode_t mode) 3256 { 3257 struct dasd_device *base; 3258 int rc; 3259 3260 base = dasd_device_from_gendisk(disk); 3261 if (!base) 3262 return -ENODEV; 3263 3264 atomic_inc(&base->block->open_count); 3265 if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) { 3266 rc = -ENODEV; 3267 goto unlock; 3268 } 3269 3270 if (!try_module_get(base->discipline->owner)) { 3271 rc = -EINVAL; 3272 goto unlock; 3273 } 3274 3275 if (dasd_probeonly) { 3276 dev_info(&base->cdev->dev, 3277 "Accessing the DASD failed because it is in " 3278 "probeonly mode\n"); 3279 rc = -EPERM; 3280 goto out; 3281 } 3282 3283 if (base->state <= DASD_STATE_BASIC) { 3284 DBF_DEV_EVENT(DBF_ERR, base, " %s", 3285 " Cannot open unrecognized device"); 3286 rc = -ENODEV; 3287 goto out; 3288 } 3289 if ((mode & BLK_OPEN_WRITE) && 3290 (test_bit(DASD_FLAG_DEVICE_RO, &base->flags) || 3291 (base->features & DASD_FEATURE_READONLY))) { 3292 rc = -EROFS; 3293 goto out; 3294 } 3295 dasd_put_device(base); 3296 return 0; 3297 3298 out: 3299 module_put(base->discipline->owner); 3300 unlock: 3301 atomic_dec(&base->block->open_count); 3302 dasd_put_device(base); 3303 return rc; 3304 } 3305 3306 static void dasd_release(struct gendisk *disk) 3307 { 3308 struct dasd_device *base = dasd_device_from_gendisk(disk); 3309 if (base) { 3310 atomic_dec(&base->block->open_count); 3311 module_put(base->discipline->owner); 3312 dasd_put_device(base); 3313 } 3314 } 3315 3316 /* 3317 * Return disk geometry. 3318 */ 3319 static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo) 3320 { 3321 struct dasd_device *base; 3322 3323 base = dasd_device_from_gendisk(bdev->bd_disk); 3324 if (!base) 3325 return -ENODEV; 3326 3327 if (!base->discipline || 3328 !base->discipline->fill_geometry) { 3329 dasd_put_device(base); 3330 return -EINVAL; 3331 } 3332 base->discipline->fill_geometry(base->block, geo); 3333 geo->start = get_start_sect(bdev) >> base->block->s2b_shift; 3334 dasd_put_device(base); 3335 return 0; 3336 } 3337 3338 const struct block_device_operations 3339 dasd_device_operations = { 3340 .owner = THIS_MODULE, 3341 .open = dasd_open, 3342 .release = dasd_release, 3343 .ioctl = dasd_ioctl, 3344 .compat_ioctl = dasd_ioctl, 3345 .getgeo = dasd_getgeo, 3346 .set_read_only = dasd_set_read_only, 3347 }; 3348 3349 /******************************************************************************* 3350 * end of block device operations 3351 */ 3352 3353 static void 3354 dasd_exit(void) 3355 { 3356 #ifdef CONFIG_PROC_FS 3357 dasd_proc_exit(); 3358 #endif 3359 dasd_eer_exit(); 3360 kmem_cache_destroy(dasd_page_cache); 3361 dasd_page_cache = NULL; 3362 dasd_gendisk_exit(); 3363 dasd_devmap_exit(); 3364 if (dasd_debug_area != NULL) { 3365 debug_unregister(dasd_debug_area); 3366 dasd_debug_area = NULL; 3367 } 3368 dasd_statistics_removeroot(); 3369 } 3370 3371 /* 3372 * SECTION: common functions for ccw_driver use 3373 */ 3374 3375 /* 3376 * Is the device read-only? 3377 * Note that this function does not report the setting of the 3378 * readonly device attribute, but how it is configured in z/VM. 3379 */ 3380 int dasd_device_is_ro(struct dasd_device *device) 3381 { 3382 struct ccw_dev_id dev_id; 3383 struct diag210 diag_data; 3384 int rc; 3385 3386 if (!machine_is_vm()) 3387 return 0; 3388 ccw_device_get_id(device->cdev, &dev_id); 3389 memset(&diag_data, 0, sizeof(diag_data)); 3390 diag_data.vrdcdvno = dev_id.devno; 3391 diag_data.vrdclen = sizeof(diag_data); 3392 rc = diag210(&diag_data); 3393 if (rc == 0 || rc == 2) { 3394 return diag_data.vrdcvfla & 0x80; 3395 } else { 3396 DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d", 3397 dev_id.devno, rc); 3398 return 0; 3399 } 3400 } 3401 EXPORT_SYMBOL_GPL(dasd_device_is_ro); 3402 3403 static void dasd_generic_auto_online(void *data, async_cookie_t cookie) 3404 { 3405 struct ccw_device *cdev = data; 3406 int ret; 3407 3408 ret = ccw_device_set_online(cdev); 3409 if (ret) 3410 dev_warn(&cdev->dev, "Setting the DASD online failed with rc=%d\n", ret); 3411 } 3412 3413 /* 3414 * Initial attempt at a probe function. this can be simplified once 3415 * the other detection code is gone. 3416 */ 3417 int dasd_generic_probe(struct ccw_device *cdev) 3418 { 3419 cdev->handler = &dasd_int_handler; 3420 3421 /* 3422 * Automatically online either all dasd devices (dasd_autodetect) 3423 * or all devices specified with dasd= parameters during 3424 * initial probe. 3425 */ 3426 if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) || 3427 (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0)) 3428 async_schedule(dasd_generic_auto_online, cdev); 3429 return 0; 3430 } 3431 EXPORT_SYMBOL_GPL(dasd_generic_probe); 3432 3433 void dasd_generic_free_discipline(struct dasd_device *device) 3434 { 3435 /* Forget the discipline information. */ 3436 if (device->discipline) { 3437 if (device->discipline->uncheck_device) 3438 device->discipline->uncheck_device(device); 3439 module_put(device->discipline->owner); 3440 device->discipline = NULL; 3441 } 3442 if (device->base_discipline) { 3443 module_put(device->base_discipline->owner); 3444 device->base_discipline = NULL; 3445 } 3446 } 3447 EXPORT_SYMBOL_GPL(dasd_generic_free_discipline); 3448 3449 /* 3450 * This will one day be called from a global not_oper handler. 3451 * It is also used by driver_unregister during module unload. 3452 */ 3453 void dasd_generic_remove(struct ccw_device *cdev) 3454 { 3455 struct dasd_device *device; 3456 struct dasd_block *block; 3457 3458 device = dasd_device_from_cdev(cdev); 3459 if (IS_ERR(device)) 3460 return; 3461 3462 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags) && 3463 !test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { 3464 /* Already doing offline processing */ 3465 dasd_put_device(device); 3466 return; 3467 } 3468 /* 3469 * This device is removed unconditionally. Set offline 3470 * flag to prevent dasd_open from opening it while it is 3471 * no quite down yet. 3472 */ 3473 dasd_set_target_state(device, DASD_STATE_NEW); 3474 cdev->handler = NULL; 3475 /* dasd_delete_device destroys the device reference. */ 3476 block = device->block; 3477 dasd_delete_device(device); 3478 /* 3479 * life cycle of block is bound to device, so delete it after 3480 * device was safely removed 3481 */ 3482 if (block) 3483 dasd_free_block(block); 3484 } 3485 EXPORT_SYMBOL_GPL(dasd_generic_remove); 3486 3487 /* 3488 * Activate a device. This is called from dasd_{eckd,fba}_probe() when either 3489 * the device is detected for the first time and is supposed to be used 3490 * or the user has started activation through sysfs. 3491 */ 3492 int dasd_generic_set_online(struct ccw_device *cdev, 3493 struct dasd_discipline *base_discipline) 3494 { 3495 struct dasd_discipline *discipline; 3496 struct dasd_device *device; 3497 struct device *dev; 3498 int rc; 3499 3500 dev = &cdev->dev; 3501 3502 /* first online clears initial online feature flag */ 3503 dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0); 3504 device = dasd_create_device(cdev); 3505 if (IS_ERR(device)) 3506 return PTR_ERR(device); 3507 3508 discipline = base_discipline; 3509 if (device->features & DASD_FEATURE_USEDIAG) { 3510 if (!dasd_diag_discipline_pointer) { 3511 /* Try to load the required module. */ 3512 rc = request_module(DASD_DIAG_MOD); 3513 if (rc) { 3514 dev_warn(dev, "Setting the DASD online failed " 3515 "because the required module %s " 3516 "could not be loaded (rc=%d)\n", 3517 DASD_DIAG_MOD, rc); 3518 dasd_delete_device(device); 3519 return -ENODEV; 3520 } 3521 } 3522 /* Module init could have failed, so check again here after 3523 * request_module(). */ 3524 if (!dasd_diag_discipline_pointer) { 3525 dev_warn(dev, "Setting the DASD online failed because of missing DIAG discipline\n"); 3526 dasd_delete_device(device); 3527 return -ENODEV; 3528 } 3529 discipline = dasd_diag_discipline_pointer; 3530 } 3531 if (!try_module_get(base_discipline->owner)) { 3532 dasd_delete_device(device); 3533 return -EINVAL; 3534 } 3535 device->base_discipline = base_discipline; 3536 if (!try_module_get(discipline->owner)) { 3537 dasd_delete_device(device); 3538 return -EINVAL; 3539 } 3540 device->discipline = discipline; 3541 3542 /* check_device will allocate block device if necessary */ 3543 rc = discipline->check_device(device); 3544 if (rc) { 3545 dev_warn(dev, "Setting the DASD online with discipline %s failed with rc=%i\n", 3546 discipline->name, rc); 3547 dasd_delete_device(device); 3548 return rc; 3549 } 3550 3551 dasd_set_target_state(device, DASD_STATE_ONLINE); 3552 if (device->state <= DASD_STATE_KNOWN) { 3553 dev_warn(dev, "Setting the DASD online failed because of a missing discipline\n"); 3554 rc = -ENODEV; 3555 dasd_set_target_state(device, DASD_STATE_NEW); 3556 if (device->block) 3557 dasd_free_block(device->block); 3558 dasd_delete_device(device); 3559 } else { 3560 dev_dbg(dev, "dasd_generic device found\n"); 3561 } 3562 3563 wait_event(dasd_init_waitq, _wait_for_device(device)); 3564 3565 dasd_put_device(device); 3566 return rc; 3567 } 3568 EXPORT_SYMBOL_GPL(dasd_generic_set_online); 3569 3570 int dasd_generic_set_offline(struct ccw_device *cdev) 3571 { 3572 int max_count, open_count, rc; 3573 struct dasd_device *device; 3574 struct dasd_block *block; 3575 unsigned long flags; 3576 struct device *dev; 3577 3578 dev = &cdev->dev; 3579 3580 rc = 0; 3581 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 3582 device = dasd_device_from_cdev_locked(cdev); 3583 if (IS_ERR(device)) { 3584 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 3585 return PTR_ERR(device); 3586 } 3587 3588 /* 3589 * We must make sure that this device is currently not in use. 3590 * The open_count is increased for every opener, that includes 3591 * the blkdev_get in dasd_scan_partitions. We are only interested 3592 * in the other openers. 3593 */ 3594 if (device->block) { 3595 max_count = device->block->bdev_file ? 0 : -1; 3596 open_count = atomic_read(&device->block->open_count); 3597 if (open_count > max_count) { 3598 if (open_count > 0) 3599 dev_warn(dev, "The DASD cannot be set offline with open count %i\n", 3600 open_count); 3601 else 3602 dev_warn(dev, "The DASD cannot be set offline while it is in use\n"); 3603 rc = -EBUSY; 3604 goto out_err; 3605 } 3606 } 3607 3608 /* 3609 * Test if the offline processing is already running and exit if so. 3610 * If a safe offline is being processed this could only be a normal 3611 * offline that should be able to overtake the safe offline and 3612 * cancel any I/O we do not want to wait for any longer 3613 */ 3614 if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) { 3615 if (test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { 3616 clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, 3617 &device->flags); 3618 } else { 3619 rc = -EBUSY; 3620 goto out_err; 3621 } 3622 } 3623 set_bit(DASD_FLAG_OFFLINE, &device->flags); 3624 3625 /* 3626 * if safe_offline is called set safe_offline_running flag and 3627 * clear safe_offline so that a call to normal offline 3628 * can overrun safe_offline processing 3629 */ 3630 if (test_and_clear_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags) && 3631 !test_and_set_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { 3632 /* need to unlock here to wait for outstanding I/O */ 3633 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 3634 /* 3635 * If we want to set the device safe offline all IO operations 3636 * should be finished before continuing the offline process 3637 * so sync bdev first and then wait for our queues to become 3638 * empty 3639 */ 3640 if (device->block && device->block->bdev_file) 3641 bdev_mark_dead(file_bdev(device->block->bdev_file), false); 3642 dasd_schedule_device_bh(device); 3643 rc = wait_event_interruptible(shutdown_waitq, 3644 _wait_for_empty_queues(device)); 3645 if (rc != 0) 3646 goto interrupted; 3647 3648 /* 3649 * check if a normal offline process overtook the offline 3650 * processing in this case simply do nothing beside returning 3651 * that we got interrupted 3652 * otherwise mark safe offline as not running any longer and 3653 * continue with normal offline 3654 */ 3655 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 3656 if (!test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { 3657 rc = -ERESTARTSYS; 3658 goto out_err; 3659 } 3660 clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags); 3661 } 3662 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 3663 3664 dasd_set_target_state(device, DASD_STATE_NEW); 3665 /* dasd_delete_device destroys the device reference. */ 3666 block = device->block; 3667 dasd_delete_device(device); 3668 /* 3669 * life cycle of block is bound to device, so delete it after 3670 * device was safely removed 3671 */ 3672 if (block) 3673 dasd_free_block(block); 3674 3675 return 0; 3676 3677 interrupted: 3678 /* interrupted by signal */ 3679 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 3680 clear_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags); 3681 clear_bit(DASD_FLAG_OFFLINE, &device->flags); 3682 out_err: 3683 dasd_put_device(device); 3684 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 3685 return rc; 3686 } 3687 EXPORT_SYMBOL_GPL(dasd_generic_set_offline); 3688 3689 int dasd_generic_last_path_gone(struct dasd_device *device) 3690 { 3691 struct dasd_ccw_req *cqr; 3692 3693 dev_warn(&device->cdev->dev, "No operational channel path is left " 3694 "for the device\n"); 3695 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone"); 3696 /* First call extended error reporting and check for autoquiesce. */ 3697 dasd_handle_autoquiesce(device, NULL, DASD_EER_NOPATH); 3698 3699 if (device->state < DASD_STATE_BASIC) 3700 return 0; 3701 /* Device is active. We want to keep it. */ 3702 list_for_each_entry(cqr, &device->ccw_queue, devlist) 3703 if ((cqr->status == DASD_CQR_IN_IO) || 3704 (cqr->status == DASD_CQR_CLEAR_PENDING)) { 3705 cqr->status = DASD_CQR_QUEUED; 3706 cqr->retries++; 3707 } 3708 dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT); 3709 dasd_device_clear_timer(device); 3710 dasd_schedule_device_bh(device); 3711 return 1; 3712 } 3713 EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone); 3714 3715 int dasd_generic_path_operational(struct dasd_device *device) 3716 { 3717 dev_info(&device->cdev->dev, "A channel path to the device has become " 3718 "operational\n"); 3719 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational"); 3720 dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT); 3721 dasd_schedule_device_bh(device); 3722 if (device->block) { 3723 dasd_schedule_block_bh(device->block); 3724 if (device->block->gdp) 3725 blk_mq_run_hw_queues(device->block->gdp->queue, true); 3726 } 3727 3728 if (!device->stopped) 3729 wake_up(&generic_waitq); 3730 3731 return 1; 3732 } 3733 EXPORT_SYMBOL_GPL(dasd_generic_path_operational); 3734 3735 int dasd_generic_notify(struct ccw_device *cdev, int event) 3736 { 3737 struct dasd_device *device; 3738 int ret; 3739 3740 device = dasd_device_from_cdev_locked(cdev); 3741 if (IS_ERR(device)) 3742 return 0; 3743 ret = 0; 3744 switch (event) { 3745 case CIO_GONE: 3746 case CIO_BOXED: 3747 case CIO_NO_PATH: 3748 dasd_path_no_path(device); 3749 ret = dasd_generic_last_path_gone(device); 3750 break; 3751 case CIO_OPER: 3752 ret = 1; 3753 if (dasd_path_get_opm(device)) 3754 ret = dasd_generic_path_operational(device); 3755 break; 3756 } 3757 dasd_put_device(device); 3758 return ret; 3759 } 3760 EXPORT_SYMBOL_GPL(dasd_generic_notify); 3761 3762 void dasd_generic_path_event(struct ccw_device *cdev, int *path_event) 3763 { 3764 struct dasd_device *device; 3765 int chp, oldopm, hpfpm, ifccpm; 3766 3767 device = dasd_device_from_cdev_locked(cdev); 3768 if (IS_ERR(device)) 3769 return; 3770 3771 oldopm = dasd_path_get_opm(device); 3772 for (chp = 0; chp < 8; chp++) { 3773 if (path_event[chp] & PE_PATH_GONE) { 3774 dasd_path_notoper(device, chp); 3775 } 3776 if (path_event[chp] & PE_PATH_AVAILABLE) { 3777 dasd_path_available(device, chp); 3778 dasd_schedule_device_bh(device); 3779 } 3780 if (path_event[chp] & PE_PATHGROUP_ESTABLISHED) { 3781 if (!dasd_path_is_operational(device, chp) && 3782 !dasd_path_need_verify(device, chp)) { 3783 /* 3784 * we can not establish a pathgroup on an 3785 * unavailable path, so trigger a path 3786 * verification first 3787 */ 3788 dasd_path_available(device, chp); 3789 dasd_schedule_device_bh(device); 3790 } 3791 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 3792 "Pathgroup re-established\n"); 3793 if (device->discipline->kick_validate) 3794 device->discipline->kick_validate(device); 3795 } 3796 if (path_event[chp] & PE_PATH_FCES_EVENT) { 3797 dasd_path_fcsec_update(device, chp); 3798 dasd_schedule_device_bh(device); 3799 } 3800 } 3801 hpfpm = dasd_path_get_hpfpm(device); 3802 ifccpm = dasd_path_get_ifccpm(device); 3803 if (!dasd_path_get_opm(device) && hpfpm) { 3804 /* 3805 * device has no operational paths but at least one path is 3806 * disabled due to HPF errors 3807 * disable HPF at all and use the path(s) again 3808 */ 3809 if (device->discipline->disable_hpf) 3810 device->discipline->disable_hpf(device); 3811 dasd_device_set_stop_bits(device, DASD_STOPPED_NOT_ACC); 3812 dasd_path_set_tbvpm(device, hpfpm); 3813 dasd_schedule_device_bh(device); 3814 dasd_schedule_requeue(device); 3815 } else if (!dasd_path_get_opm(device) && ifccpm) { 3816 /* 3817 * device has no operational paths but at least one path is 3818 * disabled due to IFCC errors 3819 * trigger path verification on paths with IFCC errors 3820 */ 3821 dasd_path_set_tbvpm(device, ifccpm); 3822 dasd_schedule_device_bh(device); 3823 } 3824 if (oldopm && !dasd_path_get_opm(device) && !hpfpm && !ifccpm) { 3825 dev_warn(&device->cdev->dev, 3826 "No verified channel paths remain for the device\n"); 3827 DBF_DEV_EVENT(DBF_WARNING, device, 3828 "%s", "last verified path gone"); 3829 /* First call extended error reporting and check for autoquiesce. */ 3830 dasd_handle_autoquiesce(device, NULL, DASD_EER_NOPATH); 3831 dasd_device_set_stop_bits(device, 3832 DASD_STOPPED_DC_WAIT); 3833 } 3834 dasd_put_device(device); 3835 } 3836 EXPORT_SYMBOL_GPL(dasd_generic_path_event); 3837 3838 int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm) 3839 { 3840 if (!dasd_path_get_opm(device) && lpm) { 3841 dasd_path_set_opm(device, lpm); 3842 dasd_generic_path_operational(device); 3843 } else 3844 dasd_path_add_opm(device, lpm); 3845 return 0; 3846 } 3847 EXPORT_SYMBOL_GPL(dasd_generic_verify_path); 3848 3849 void dasd_generic_space_exhaust(struct dasd_device *device, 3850 struct dasd_ccw_req *cqr) 3851 { 3852 /* First call extended error reporting and check for autoquiesce. */ 3853 dasd_handle_autoquiesce(device, NULL, DASD_EER_NOSPC); 3854 3855 if (device->state < DASD_STATE_BASIC) 3856 return; 3857 3858 if (cqr->status == DASD_CQR_IN_IO || 3859 cqr->status == DASD_CQR_CLEAR_PENDING) { 3860 cqr->status = DASD_CQR_QUEUED; 3861 cqr->retries++; 3862 } 3863 dasd_device_set_stop_bits(device, DASD_STOPPED_NOSPC); 3864 dasd_device_clear_timer(device); 3865 dasd_schedule_device_bh(device); 3866 } 3867 EXPORT_SYMBOL_GPL(dasd_generic_space_exhaust); 3868 3869 void dasd_generic_space_avail(struct dasd_device *device) 3870 { 3871 dev_info(&device->cdev->dev, "Extent pool space is available\n"); 3872 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "space available"); 3873 3874 dasd_device_remove_stop_bits(device, DASD_STOPPED_NOSPC); 3875 dasd_schedule_device_bh(device); 3876 3877 if (device->block) { 3878 dasd_schedule_block_bh(device->block); 3879 if (device->block->gdp) 3880 blk_mq_run_hw_queues(device->block->gdp->queue, true); 3881 } 3882 if (!device->stopped) 3883 wake_up(&generic_waitq); 3884 } 3885 EXPORT_SYMBOL_GPL(dasd_generic_space_avail); 3886 3887 /* 3888 * clear active requests and requeue them to block layer if possible 3889 */ 3890 int dasd_generic_requeue_all_requests(struct dasd_device *device) 3891 { 3892 struct dasd_block *block = device->block; 3893 struct list_head requeue_queue; 3894 struct dasd_ccw_req *cqr, *n; 3895 int rc; 3896 3897 if (!block) 3898 return 0; 3899 3900 INIT_LIST_HEAD(&requeue_queue); 3901 rc = _dasd_requests_to_flushqueue(block, &requeue_queue); 3902 3903 /* Now call the callback function of flushed requests */ 3904 restart_cb: 3905 list_for_each_entry_safe(cqr, n, &requeue_queue, blocklist) { 3906 wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED)); 3907 /* Process finished ERP request. */ 3908 if (cqr->refers) { 3909 spin_lock_bh(&block->queue_lock); 3910 __dasd_process_erp(block->base, cqr); 3911 spin_unlock_bh(&block->queue_lock); 3912 /* restart list_for_xx loop since dasd_process_erp 3913 * might remove multiple elements 3914 */ 3915 goto restart_cb; 3916 } 3917 _dasd_requeue_request(cqr); 3918 list_del_init(&cqr->blocklist); 3919 cqr->block->base->discipline->free_cp( 3920 cqr, (struct request *) cqr->callback_data); 3921 } 3922 dasd_schedule_device_bh(device); 3923 return rc; 3924 } 3925 EXPORT_SYMBOL_GPL(dasd_generic_requeue_all_requests); 3926 3927 static void do_requeue_requests(struct work_struct *work) 3928 { 3929 struct dasd_device *device = container_of(work, struct dasd_device, 3930 requeue_requests); 3931 dasd_generic_requeue_all_requests(device); 3932 dasd_device_remove_stop_bits(device, DASD_STOPPED_NOT_ACC); 3933 if (device->block) 3934 dasd_schedule_block_bh(device->block); 3935 dasd_put_device(device); 3936 } 3937 3938 void dasd_schedule_requeue(struct dasd_device *device) 3939 { 3940 dasd_get_device(device); 3941 /* queue call to dasd_reload_device to the kernel event daemon. */ 3942 if (!schedule_work(&device->requeue_requests)) 3943 dasd_put_device(device); 3944 } 3945 EXPORT_SYMBOL(dasd_schedule_requeue); 3946 3947 static int dasd_handle_autoquiesce(struct dasd_device *device, 3948 struct dasd_ccw_req *cqr, 3949 unsigned int reason) 3950 { 3951 /* in any case write eer message with reason */ 3952 if (dasd_eer_enabled(device)) 3953 dasd_eer_write(device, cqr, reason); 3954 3955 if (!test_bit(reason, &device->aq_mask)) 3956 return 0; 3957 3958 /* notify eer about autoquiesce */ 3959 if (dasd_eer_enabled(device)) 3960 dasd_eer_write(device, NULL, DASD_EER_AUTOQUIESCE); 3961 3962 dev_info(&device->cdev->dev, 3963 "The DASD has been put in the quiesce state\n"); 3964 dasd_device_set_stop_bits(device, DASD_STOPPED_QUIESCE); 3965 3966 if (device->features & DASD_FEATURE_REQUEUEQUIESCE) 3967 dasd_schedule_requeue(device); 3968 3969 return 1; 3970 } 3971 3972 static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device, 3973 int rdc_buffer_size, 3974 int magic) 3975 { 3976 struct dasd_ccw_req *cqr; 3977 struct ccw1 *ccw; 3978 3979 cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device, 3980 NULL); 3981 3982 if (IS_ERR(cqr)) { 3983 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", 3984 "Could not allocate RDC request"); 3985 return cqr; 3986 } 3987 3988 ccw = cqr->cpaddr; 3989 ccw->cmd_code = CCW_CMD_RDC; 3990 ccw->cda = virt_to_dma32(cqr->data); 3991 ccw->flags = 0; 3992 ccw->count = rdc_buffer_size; 3993 cqr->startdev = device; 3994 cqr->memdev = device; 3995 cqr->expires = 10*HZ; 3996 cqr->retries = 256; 3997 cqr->buildclk = get_tod_clock(); 3998 cqr->status = DASD_CQR_FILLED; 3999 return cqr; 4000 } 4001 4002 4003 int dasd_generic_read_dev_chars(struct dasd_device *device, int magic, 4004 void *rdc_buffer, int rdc_buffer_size) 4005 { 4006 int ret; 4007 struct dasd_ccw_req *cqr; 4008 4009 cqr = dasd_generic_build_rdc(device, rdc_buffer_size, magic); 4010 if (IS_ERR(cqr)) 4011 return PTR_ERR(cqr); 4012 4013 ret = dasd_sleep_on(cqr); 4014 if (ret == 0) 4015 memcpy(rdc_buffer, cqr->data, rdc_buffer_size); 4016 dasd_sfree_request(cqr, cqr->memdev); 4017 return ret; 4018 } 4019 EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars); 4020 4021 /* 4022 * In command mode and transport mode we need to look for sense 4023 * data in different places. The sense data itself is allways 4024 * an array of 32 bytes, so we can unify the sense data access 4025 * for both modes. 4026 */ 4027 char *dasd_get_sense(struct irb *irb) 4028 { 4029 struct tsb *tsb = NULL; 4030 char *sense = NULL; 4031 4032 if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) { 4033 if (irb->scsw.tm.tcw) 4034 tsb = tcw_get_tsb(dma32_to_virt(irb->scsw.tm.tcw)); 4035 if (tsb && tsb->length == 64 && tsb->flags) 4036 switch (tsb->flags & 0x07) { 4037 case 1: /* tsa_iostat */ 4038 sense = tsb->tsa.iostat.sense; 4039 break; 4040 case 2: /* tsa_ddpc */ 4041 sense = tsb->tsa.ddpc.sense; 4042 break; 4043 default: 4044 /* currently we don't use interrogate data */ 4045 break; 4046 } 4047 } else if (irb->esw.esw0.erw.cons) { 4048 sense = irb->ecw; 4049 } 4050 return sense; 4051 } 4052 EXPORT_SYMBOL_GPL(dasd_get_sense); 4053 4054 void dasd_generic_shutdown(struct ccw_device *cdev) 4055 { 4056 struct dasd_device *device; 4057 4058 device = dasd_device_from_cdev(cdev); 4059 if (IS_ERR(device)) 4060 return; 4061 4062 if (device->block) 4063 dasd_schedule_block_bh(device->block); 4064 4065 dasd_schedule_device_bh(device); 4066 4067 wait_event(shutdown_waitq, _wait_for_empty_queues(device)); 4068 } 4069 EXPORT_SYMBOL_GPL(dasd_generic_shutdown); 4070 4071 static int __init dasd_init(void) 4072 { 4073 int rc; 4074 4075 init_waitqueue_head(&dasd_init_waitq); 4076 init_waitqueue_head(&dasd_flush_wq); 4077 init_waitqueue_head(&generic_waitq); 4078 init_waitqueue_head(&shutdown_waitq); 4079 4080 /* register 'common' DASD debug area, used for all DBF_XXX calls */ 4081 dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long)); 4082 if (dasd_debug_area == NULL) { 4083 rc = -ENOMEM; 4084 goto failed; 4085 } 4086 debug_register_view(dasd_debug_area, &debug_sprintf_view); 4087 debug_set_level(dasd_debug_area, DBF_WARNING); 4088 4089 DBF_EVENT(DBF_EMERG, "%s", "debug area created"); 4090 4091 dasd_diag_discipline_pointer = NULL; 4092 4093 dasd_statistics_createroot(); 4094 4095 rc = dasd_devmap_init(); 4096 if (rc) 4097 goto failed; 4098 rc = dasd_gendisk_init(); 4099 if (rc) 4100 goto failed; 4101 rc = dasd_parse(); 4102 if (rc) 4103 goto failed; 4104 rc = dasd_eer_init(); 4105 if (rc) 4106 goto failed; 4107 #ifdef CONFIG_PROC_FS 4108 rc = dasd_proc_init(); 4109 if (rc) 4110 goto failed; 4111 #endif 4112 4113 return 0; 4114 failed: 4115 pr_info("The DASD device driver could not be initialized\n"); 4116 dasd_exit(); 4117 return rc; 4118 } 4119 4120 module_init(dasd_init); 4121 module_exit(dasd_exit); 4122