1 /* 2 * File...........: linux/drivers/s390/block/dasd.c 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 #define KMSG_COMPONENT "dasd" 12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 13 14 #include <linux/kmod.h> 15 #include <linux/init.h> 16 #include <linux/interrupt.h> 17 #include <linux/ctype.h> 18 #include <linux/major.h> 19 #include <linux/slab.h> 20 #include <linux/hdreg.h> 21 #include <linux/async.h> 22 #include <linux/mutex.h> 23 #include <linux/debugfs.h> 24 #include <linux/seq_file.h> 25 #include <linux/vmalloc.h> 26 27 #include <asm/ccwdev.h> 28 #include <asm/ebcdic.h> 29 #include <asm/idals.h> 30 #include <asm/itcw.h> 31 #include <asm/diag.h> 32 33 /* This is ugly... */ 34 #define PRINTK_HEADER "dasd:" 35 36 #include "dasd_int.h" 37 /* 38 * SECTION: Constant definitions to be used within this file 39 */ 40 #define DASD_CHANQ_MAX_SIZE 4 41 42 #define DASD_SLEEPON_START_TAG (void *) 1 43 #define DASD_SLEEPON_END_TAG (void *) 2 44 45 /* 46 * SECTION: exported variables of dasd.c 47 */ 48 debug_info_t *dasd_debug_area; 49 static struct dentry *dasd_debugfs_root_entry; 50 struct dasd_discipline *dasd_diag_discipline_pointer; 51 void dasd_int_handler(struct ccw_device *, unsigned long, struct irb *); 52 53 MODULE_AUTHOR("Holger Smolinski <Holger.Smolinski@de.ibm.com>"); 54 MODULE_DESCRIPTION("Linux on S/390 DASD device driver," 55 " Copyright 2000 IBM Corporation"); 56 MODULE_SUPPORTED_DEVICE("dasd"); 57 MODULE_LICENSE("GPL"); 58 59 /* 60 * SECTION: prototypes for static functions of dasd.c 61 */ 62 static int dasd_alloc_queue(struct dasd_block *); 63 static void dasd_setup_queue(struct dasd_block *); 64 static void dasd_free_queue(struct dasd_block *); 65 static void dasd_flush_request_queue(struct dasd_block *); 66 static int dasd_flush_block_queue(struct dasd_block *); 67 static void dasd_device_tasklet(struct dasd_device *); 68 static void dasd_block_tasklet(struct dasd_block *); 69 static void do_kick_device(struct work_struct *); 70 static void do_restore_device(struct work_struct *); 71 static void do_reload_device(struct work_struct *); 72 static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *); 73 static void dasd_device_timeout(unsigned long); 74 static void dasd_block_timeout(unsigned long); 75 static void __dasd_process_erp(struct dasd_device *, struct dasd_ccw_req *); 76 static void dasd_profile_init(struct dasd_profile *, struct dentry *); 77 static void dasd_profile_exit(struct dasd_profile *); 78 79 /* 80 * SECTION: Operations on the device structure. 81 */ 82 static wait_queue_head_t dasd_init_waitq; 83 static wait_queue_head_t dasd_flush_wq; 84 static wait_queue_head_t generic_waitq; 85 86 /* 87 * Allocate memory for a new device structure. 88 */ 89 struct dasd_device *dasd_alloc_device(void) 90 { 91 struct dasd_device *device; 92 93 device = kzalloc(sizeof(struct dasd_device), GFP_ATOMIC); 94 if (!device) 95 return ERR_PTR(-ENOMEM); 96 97 /* Get two pages for normal block device operations. */ 98 device->ccw_mem = (void *) __get_free_pages(GFP_ATOMIC | GFP_DMA, 1); 99 if (!device->ccw_mem) { 100 kfree(device); 101 return ERR_PTR(-ENOMEM); 102 } 103 /* Get one page for error recovery. */ 104 device->erp_mem = (void *) get_zeroed_page(GFP_ATOMIC | GFP_DMA); 105 if (!device->erp_mem) { 106 free_pages((unsigned long) device->ccw_mem, 1); 107 kfree(device); 108 return ERR_PTR(-ENOMEM); 109 } 110 111 dasd_init_chunklist(&device->ccw_chunks, device->ccw_mem, PAGE_SIZE*2); 112 dasd_init_chunklist(&device->erp_chunks, device->erp_mem, PAGE_SIZE); 113 spin_lock_init(&device->mem_lock); 114 atomic_set(&device->tasklet_scheduled, 0); 115 tasklet_init(&device->tasklet, 116 (void (*)(unsigned long)) dasd_device_tasklet, 117 (unsigned long) device); 118 INIT_LIST_HEAD(&device->ccw_queue); 119 init_timer(&device->timer); 120 device->timer.function = dasd_device_timeout; 121 device->timer.data = (unsigned long) device; 122 INIT_WORK(&device->kick_work, do_kick_device); 123 INIT_WORK(&device->restore_device, do_restore_device); 124 INIT_WORK(&device->reload_device, do_reload_device); 125 device->state = DASD_STATE_NEW; 126 device->target = DASD_STATE_NEW; 127 mutex_init(&device->state_mutex); 128 spin_lock_init(&device->profile.lock); 129 return device; 130 } 131 132 /* 133 * Free memory of a device structure. 134 */ 135 void dasd_free_device(struct dasd_device *device) 136 { 137 kfree(device->private); 138 free_page((unsigned long) device->erp_mem); 139 free_pages((unsigned long) device->ccw_mem, 1); 140 kfree(device); 141 } 142 143 /* 144 * Allocate memory for a new device structure. 145 */ 146 struct dasd_block *dasd_alloc_block(void) 147 { 148 struct dasd_block *block; 149 150 block = kzalloc(sizeof(*block), GFP_ATOMIC); 151 if (!block) 152 return ERR_PTR(-ENOMEM); 153 /* open_count = 0 means device online but not in use */ 154 atomic_set(&block->open_count, -1); 155 156 spin_lock_init(&block->request_queue_lock); 157 atomic_set(&block->tasklet_scheduled, 0); 158 tasklet_init(&block->tasklet, 159 (void (*)(unsigned long)) dasd_block_tasklet, 160 (unsigned long) block); 161 INIT_LIST_HEAD(&block->ccw_queue); 162 spin_lock_init(&block->queue_lock); 163 init_timer(&block->timer); 164 block->timer.function = dasd_block_timeout; 165 block->timer.data = (unsigned long) block; 166 spin_lock_init(&block->profile.lock); 167 168 return block; 169 } 170 171 /* 172 * Free memory of a device structure. 173 */ 174 void dasd_free_block(struct dasd_block *block) 175 { 176 kfree(block); 177 } 178 179 /* 180 * Make a new device known to the system. 181 */ 182 static int dasd_state_new_to_known(struct dasd_device *device) 183 { 184 int rc; 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); 191 192 if (device->block) { 193 rc = dasd_alloc_queue(device->block); 194 if (rc) { 195 dasd_put_device(device); 196 return rc; 197 } 198 } 199 device->state = DASD_STATE_KNOWN; 200 return 0; 201 } 202 203 /* 204 * Let the system forget about a device. 205 */ 206 static int dasd_state_known_to_new(struct dasd_device *device) 207 { 208 /* Disable extended error reporting for this device. */ 209 dasd_eer_disable(device); 210 /* Forget the discipline information. */ 211 if (device->discipline) { 212 if (device->discipline->uncheck_device) 213 device->discipline->uncheck_device(device); 214 module_put(device->discipline->owner); 215 } 216 device->discipline = NULL; 217 if (device->base_discipline) 218 module_put(device->base_discipline->owner); 219 device->base_discipline = NULL; 220 device->state = DASD_STATE_NEW; 221 222 if (device->block) 223 dasd_free_queue(device->block); 224 225 /* Give up reference we took in dasd_state_new_to_known. */ 226 dasd_put_device(device); 227 return 0; 228 } 229 230 static struct dentry *dasd_debugfs_setup(const char *name, 231 struct dentry *base_dentry) 232 { 233 struct dentry *pde; 234 235 if (!base_dentry) 236 return NULL; 237 pde = debugfs_create_dir(name, base_dentry); 238 if (!pde || IS_ERR(pde)) 239 return NULL; 240 return pde; 241 } 242 243 /* 244 * Request the irq line for the device. 245 */ 246 static int dasd_state_known_to_basic(struct dasd_device *device) 247 { 248 struct dasd_block *block = device->block; 249 int rc; 250 251 /* Allocate and register gendisk structure. */ 252 if (block) { 253 rc = dasd_gendisk_alloc(block); 254 if (rc) 255 return rc; 256 block->debugfs_dentry = 257 dasd_debugfs_setup(block->gdp->disk_name, 258 dasd_debugfs_root_entry); 259 dasd_profile_init(&block->profile, block->debugfs_dentry); 260 if (dasd_global_profile_level == DASD_PROFILE_ON) 261 dasd_profile_on(&device->block->profile); 262 } 263 device->debugfs_dentry = 264 dasd_debugfs_setup(dev_name(&device->cdev->dev), 265 dasd_debugfs_root_entry); 266 dasd_profile_init(&device->profile, device->debugfs_dentry); 267 268 /* register 'device' debug area, used for all DBF_DEV_XXX calls */ 269 device->debug_area = debug_register(dev_name(&device->cdev->dev), 4, 1, 270 8 * sizeof(long)); 271 debug_register_view(device->debug_area, &debug_sprintf_view); 272 debug_set_level(device->debug_area, DBF_WARNING); 273 DBF_DEV_EVENT(DBF_EMERG, device, "%s", "debug area created"); 274 275 device->state = DASD_STATE_BASIC; 276 return 0; 277 } 278 279 /* 280 * Release the irq line for the device. Terminate any running i/o. 281 */ 282 static int dasd_state_basic_to_known(struct dasd_device *device) 283 { 284 int rc; 285 if (device->block) { 286 dasd_profile_exit(&device->block->profile); 287 if (device->block->debugfs_dentry) 288 debugfs_remove(device->block->debugfs_dentry); 289 dasd_gendisk_free(device->block); 290 dasd_block_clear_timer(device->block); 291 } 292 rc = dasd_flush_device_queue(device); 293 if (rc) 294 return rc; 295 dasd_device_clear_timer(device); 296 dasd_profile_exit(&device->profile); 297 if (device->debugfs_dentry) 298 debugfs_remove(device->debugfs_dentry); 299 300 DBF_DEV_EVENT(DBF_EMERG, device, "%p debug area deleted", device); 301 if (device->debug_area != NULL) { 302 debug_unregister(device->debug_area); 303 device->debug_area = NULL; 304 } 305 device->state = DASD_STATE_KNOWN; 306 return 0; 307 } 308 309 /* 310 * Do the initial analysis. The do_analysis function may return 311 * -EAGAIN in which case the device keeps the state DASD_STATE_BASIC 312 * until the discipline decides to continue the startup sequence 313 * by calling the function dasd_change_state. The eckd disciplines 314 * uses this to start a ccw that detects the format. The completion 315 * interrupt for this detection ccw uses the kernel event daemon to 316 * trigger the call to dasd_change_state. All this is done in the 317 * discipline code, see dasd_eckd.c. 318 * After the analysis ccw is done (do_analysis returned 0) the block 319 * device is setup. 320 * In case the analysis returns an error, the device setup is stopped 321 * (a fake disk was already added to allow formatting). 322 */ 323 static int dasd_state_basic_to_ready(struct dasd_device *device) 324 { 325 int rc; 326 struct dasd_block *block; 327 328 rc = 0; 329 block = device->block; 330 /* make disk known with correct capacity */ 331 if (block) { 332 if (block->base->discipline->do_analysis != NULL) 333 rc = block->base->discipline->do_analysis(block); 334 if (rc) { 335 if (rc != -EAGAIN) 336 device->state = DASD_STATE_UNFMT; 337 return rc; 338 } 339 dasd_setup_queue(block); 340 set_capacity(block->gdp, 341 block->blocks << block->s2b_shift); 342 device->state = DASD_STATE_READY; 343 rc = dasd_scan_partitions(block); 344 if (rc) 345 device->state = DASD_STATE_BASIC; 346 } else { 347 device->state = DASD_STATE_READY; 348 } 349 return rc; 350 } 351 352 /* 353 * Remove device from block device layer. Destroy dirty buffers. 354 * Forget format information. Check if the target level is basic 355 * and if it is create fake disk for formatting. 356 */ 357 static int dasd_state_ready_to_basic(struct dasd_device *device) 358 { 359 int rc; 360 361 device->state = DASD_STATE_BASIC; 362 if (device->block) { 363 struct dasd_block *block = device->block; 364 rc = dasd_flush_block_queue(block); 365 if (rc) { 366 device->state = DASD_STATE_READY; 367 return rc; 368 } 369 dasd_flush_request_queue(block); 370 dasd_destroy_partitions(block); 371 block->blocks = 0; 372 block->bp_block = 0; 373 block->s2b_shift = 0; 374 } 375 return 0; 376 } 377 378 /* 379 * Back to basic. 380 */ 381 static int dasd_state_unfmt_to_basic(struct dasd_device *device) 382 { 383 device->state = DASD_STATE_BASIC; 384 return 0; 385 } 386 387 /* 388 * Make the device online and schedule the bottom half to start 389 * the requeueing of requests from the linux request queue to the 390 * ccw queue. 391 */ 392 static int 393 dasd_state_ready_to_online(struct dasd_device * device) 394 { 395 int rc; 396 struct gendisk *disk; 397 struct disk_part_iter piter; 398 struct hd_struct *part; 399 400 if (device->discipline->ready_to_online) { 401 rc = device->discipline->ready_to_online(device); 402 if (rc) 403 return rc; 404 } 405 device->state = DASD_STATE_ONLINE; 406 if (device->block) { 407 dasd_schedule_block_bh(device->block); 408 if ((device->features & DASD_FEATURE_USERAW)) { 409 disk = device->block->gdp; 410 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE); 411 return 0; 412 } 413 disk = device->block->bdev->bd_disk; 414 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); 415 while ((part = disk_part_iter_next(&piter))) 416 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); 417 disk_part_iter_exit(&piter); 418 } 419 return 0; 420 } 421 422 /* 423 * Stop the requeueing of requests again. 424 */ 425 static int dasd_state_online_to_ready(struct dasd_device *device) 426 { 427 int rc; 428 struct gendisk *disk; 429 struct disk_part_iter piter; 430 struct hd_struct *part; 431 432 if (device->discipline->online_to_ready) { 433 rc = device->discipline->online_to_ready(device); 434 if (rc) 435 return rc; 436 } 437 device->state = DASD_STATE_READY; 438 if (device->block && !(device->features & DASD_FEATURE_USERAW)) { 439 disk = device->block->bdev->bd_disk; 440 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); 441 while ((part = disk_part_iter_next(&piter))) 442 kobject_uevent(&part_to_dev(part)->kobj, KOBJ_CHANGE); 443 disk_part_iter_exit(&piter); 444 } 445 return 0; 446 } 447 448 /* 449 * Device startup state changes. 450 */ 451 static int dasd_increase_state(struct dasd_device *device) 452 { 453 int rc; 454 455 rc = 0; 456 if (device->state == DASD_STATE_NEW && 457 device->target >= DASD_STATE_KNOWN) 458 rc = dasd_state_new_to_known(device); 459 460 if (!rc && 461 device->state == DASD_STATE_KNOWN && 462 device->target >= DASD_STATE_BASIC) 463 rc = dasd_state_known_to_basic(device); 464 465 if (!rc && 466 device->state == DASD_STATE_BASIC && 467 device->target >= DASD_STATE_READY) 468 rc = dasd_state_basic_to_ready(device); 469 470 if (!rc && 471 device->state == DASD_STATE_UNFMT && 472 device->target > DASD_STATE_UNFMT) 473 rc = -EPERM; 474 475 if (!rc && 476 device->state == DASD_STATE_READY && 477 device->target >= DASD_STATE_ONLINE) 478 rc = dasd_state_ready_to_online(device); 479 480 return rc; 481 } 482 483 /* 484 * Device shutdown state changes. 485 */ 486 static int dasd_decrease_state(struct dasd_device *device) 487 { 488 int rc; 489 490 rc = 0; 491 if (device->state == DASD_STATE_ONLINE && 492 device->target <= DASD_STATE_READY) 493 rc = dasd_state_online_to_ready(device); 494 495 if (!rc && 496 device->state == DASD_STATE_READY && 497 device->target <= DASD_STATE_BASIC) 498 rc = dasd_state_ready_to_basic(device); 499 500 if (!rc && 501 device->state == DASD_STATE_UNFMT && 502 device->target <= DASD_STATE_BASIC) 503 rc = dasd_state_unfmt_to_basic(device); 504 505 if (!rc && 506 device->state == DASD_STATE_BASIC && 507 device->target <= DASD_STATE_KNOWN) 508 rc = dasd_state_basic_to_known(device); 509 510 if (!rc && 511 device->state == DASD_STATE_KNOWN && 512 device->target <= DASD_STATE_NEW) 513 rc = dasd_state_known_to_new(device); 514 515 return rc; 516 } 517 518 /* 519 * This is the main startup/shutdown routine. 520 */ 521 static void dasd_change_state(struct dasd_device *device) 522 { 523 int rc; 524 525 if (device->state == device->target) 526 /* Already where we want to go today... */ 527 return; 528 if (device->state < device->target) 529 rc = dasd_increase_state(device); 530 else 531 rc = dasd_decrease_state(device); 532 if (rc == -EAGAIN) 533 return; 534 if (rc) 535 device->target = device->state; 536 537 if (device->state == device->target) 538 wake_up(&dasd_init_waitq); 539 540 /* let user-space know that the device status changed */ 541 kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE); 542 } 543 544 /* 545 * Kick starter for devices that did not complete the startup/shutdown 546 * procedure or were sleeping because of a pending state. 547 * dasd_kick_device will schedule a call do do_kick_device to the kernel 548 * event daemon. 549 */ 550 static void do_kick_device(struct work_struct *work) 551 { 552 struct dasd_device *device = container_of(work, struct dasd_device, kick_work); 553 mutex_lock(&device->state_mutex); 554 dasd_change_state(device); 555 mutex_unlock(&device->state_mutex); 556 dasd_schedule_device_bh(device); 557 dasd_put_device(device); 558 } 559 560 void dasd_kick_device(struct dasd_device *device) 561 { 562 dasd_get_device(device); 563 /* queue call to dasd_kick_device to the kernel event daemon. */ 564 schedule_work(&device->kick_work); 565 } 566 567 /* 568 * dasd_reload_device will schedule a call do do_reload_device to the kernel 569 * event daemon. 570 */ 571 static void do_reload_device(struct work_struct *work) 572 { 573 struct dasd_device *device = container_of(work, struct dasd_device, 574 reload_device); 575 device->discipline->reload(device); 576 dasd_put_device(device); 577 } 578 579 void dasd_reload_device(struct dasd_device *device) 580 { 581 dasd_get_device(device); 582 /* queue call to dasd_reload_device to the kernel event daemon. */ 583 schedule_work(&device->reload_device); 584 } 585 EXPORT_SYMBOL(dasd_reload_device); 586 587 /* 588 * dasd_restore_device will schedule a call do do_restore_device to the kernel 589 * event daemon. 590 */ 591 static void do_restore_device(struct work_struct *work) 592 { 593 struct dasd_device *device = container_of(work, struct dasd_device, 594 restore_device); 595 device->cdev->drv->restore(device->cdev); 596 dasd_put_device(device); 597 } 598 599 void dasd_restore_device(struct dasd_device *device) 600 { 601 dasd_get_device(device); 602 /* queue call to dasd_restore_device to the kernel event daemon. */ 603 schedule_work(&device->restore_device); 604 } 605 606 /* 607 * Set the target state for a device and starts the state change. 608 */ 609 void dasd_set_target_state(struct dasd_device *device, int target) 610 { 611 dasd_get_device(device); 612 mutex_lock(&device->state_mutex); 613 /* If we are in probeonly mode stop at DASD_STATE_READY. */ 614 if (dasd_probeonly && target > DASD_STATE_READY) 615 target = DASD_STATE_READY; 616 if (device->target != target) { 617 if (device->state == target) 618 wake_up(&dasd_init_waitq); 619 device->target = target; 620 } 621 if (device->state != device->target) 622 dasd_change_state(device); 623 mutex_unlock(&device->state_mutex); 624 dasd_put_device(device); 625 } 626 627 /* 628 * Enable devices with device numbers in [from..to]. 629 */ 630 static inline int _wait_for_device(struct dasd_device *device) 631 { 632 return (device->state == device->target); 633 } 634 635 void dasd_enable_device(struct dasd_device *device) 636 { 637 dasd_set_target_state(device, DASD_STATE_ONLINE); 638 if (device->state <= DASD_STATE_KNOWN) 639 /* No discipline for device found. */ 640 dasd_set_target_state(device, DASD_STATE_NEW); 641 /* Now wait for the devices to come up. */ 642 wait_event(dasd_init_waitq, _wait_for_device(device)); 643 644 dasd_reload_device(device); 645 if (device->discipline->kick_validate) 646 device->discipline->kick_validate(device); 647 } 648 649 /* 650 * SECTION: device operation (interrupt handler, start i/o, term i/o ...) 651 */ 652 653 unsigned int dasd_global_profile_level = DASD_PROFILE_OFF; 654 655 #ifdef CONFIG_DASD_PROFILE 656 struct dasd_profile_info dasd_global_profile_data; 657 static struct dentry *dasd_global_profile_dentry; 658 static struct dentry *dasd_debugfs_global_entry; 659 660 /* 661 * Add profiling information for cqr before execution. 662 */ 663 static void dasd_profile_start(struct dasd_block *block, 664 struct dasd_ccw_req *cqr, 665 struct request *req) 666 { 667 struct list_head *l; 668 unsigned int counter; 669 struct dasd_device *device; 670 671 /* count the length of the chanq for statistics */ 672 counter = 0; 673 if (dasd_global_profile_level || block->profile.data) 674 list_for_each(l, &block->ccw_queue) 675 if (++counter >= 31) 676 break; 677 678 if (dasd_global_profile_level) { 679 dasd_global_profile_data.dasd_io_nr_req[counter]++; 680 if (rq_data_dir(req) == READ) 681 dasd_global_profile_data.dasd_read_nr_req[counter]++; 682 } 683 684 spin_lock(&block->profile.lock); 685 if (block->profile.data) 686 block->profile.data->dasd_io_nr_req[counter]++; 687 if (rq_data_dir(req) == READ) 688 block->profile.data->dasd_read_nr_req[counter]++; 689 spin_unlock(&block->profile.lock); 690 691 /* 692 * We count the request for the start device, even though it may run on 693 * some other device due to error recovery. This way we make sure that 694 * we count each request only once. 695 */ 696 device = cqr->startdev; 697 if (device->profile.data) { 698 counter = 1; /* request is not yet queued on the start device */ 699 list_for_each(l, &device->ccw_queue) 700 if (++counter >= 31) 701 break; 702 } 703 spin_lock(&device->profile.lock); 704 if (device->profile.data) { 705 device->profile.data->dasd_io_nr_req[counter]++; 706 if (rq_data_dir(req) == READ) 707 device->profile.data->dasd_read_nr_req[counter]++; 708 } 709 spin_unlock(&device->profile.lock); 710 } 711 712 /* 713 * Add profiling information for cqr after execution. 714 */ 715 716 #define dasd_profile_counter(value, index) \ 717 { \ 718 for (index = 0; index < 31 && value >> (2+index); index++) \ 719 ; \ 720 } 721 722 static void dasd_profile_end_add_data(struct dasd_profile_info *data, 723 int is_alias, 724 int is_tpm, 725 int is_read, 726 long sectors, 727 int sectors_ind, 728 int tottime_ind, 729 int tottimeps_ind, 730 int strtime_ind, 731 int irqtime_ind, 732 int irqtimeps_ind, 733 int endtime_ind) 734 { 735 /* in case of an overflow, reset the whole profile */ 736 if (data->dasd_io_reqs == UINT_MAX) { 737 memset(data, 0, sizeof(*data)); 738 getnstimeofday(&data->starttod); 739 } 740 data->dasd_io_reqs++; 741 data->dasd_io_sects += sectors; 742 if (is_alias) 743 data->dasd_io_alias++; 744 if (is_tpm) 745 data->dasd_io_tpm++; 746 747 data->dasd_io_secs[sectors_ind]++; 748 data->dasd_io_times[tottime_ind]++; 749 data->dasd_io_timps[tottimeps_ind]++; 750 data->dasd_io_time1[strtime_ind]++; 751 data->dasd_io_time2[irqtime_ind]++; 752 data->dasd_io_time2ps[irqtimeps_ind]++; 753 data->dasd_io_time3[endtime_ind]++; 754 755 if (is_read) { 756 data->dasd_read_reqs++; 757 data->dasd_read_sects += sectors; 758 if (is_alias) 759 data->dasd_read_alias++; 760 if (is_tpm) 761 data->dasd_read_tpm++; 762 data->dasd_read_secs[sectors_ind]++; 763 data->dasd_read_times[tottime_ind]++; 764 data->dasd_read_time1[strtime_ind]++; 765 data->dasd_read_time2[irqtime_ind]++; 766 data->dasd_read_time3[endtime_ind]++; 767 } 768 } 769 770 static void dasd_profile_end(struct dasd_block *block, 771 struct dasd_ccw_req *cqr, 772 struct request *req) 773 { 774 long strtime, irqtime, endtime, tottime; /* in microseconds */ 775 long tottimeps, sectors; 776 struct dasd_device *device; 777 int sectors_ind, tottime_ind, tottimeps_ind, strtime_ind; 778 int irqtime_ind, irqtimeps_ind, endtime_ind; 779 780 device = cqr->startdev; 781 if (!(dasd_global_profile_level || 782 block->profile.data || 783 device->profile.data)) 784 return; 785 786 sectors = blk_rq_sectors(req); 787 if (!cqr->buildclk || !cqr->startclk || 788 !cqr->stopclk || !cqr->endclk || 789 !sectors) 790 return; 791 792 strtime = ((cqr->startclk - cqr->buildclk) >> 12); 793 irqtime = ((cqr->stopclk - cqr->startclk) >> 12); 794 endtime = ((cqr->endclk - cqr->stopclk) >> 12); 795 tottime = ((cqr->endclk - cqr->buildclk) >> 12); 796 tottimeps = tottime / sectors; 797 798 dasd_profile_counter(sectors, sectors_ind); 799 dasd_profile_counter(tottime, tottime_ind); 800 dasd_profile_counter(tottimeps, tottimeps_ind); 801 dasd_profile_counter(strtime, strtime_ind); 802 dasd_profile_counter(irqtime, irqtime_ind); 803 dasd_profile_counter(irqtime / sectors, irqtimeps_ind); 804 dasd_profile_counter(endtime, endtime_ind); 805 806 if (dasd_global_profile_level) { 807 dasd_profile_end_add_data(&dasd_global_profile_data, 808 cqr->startdev != block->base, 809 cqr->cpmode == 1, 810 rq_data_dir(req) == READ, 811 sectors, sectors_ind, tottime_ind, 812 tottimeps_ind, strtime_ind, 813 irqtime_ind, irqtimeps_ind, 814 endtime_ind); 815 } 816 817 spin_lock(&block->profile.lock); 818 if (block->profile.data) 819 dasd_profile_end_add_data(block->profile.data, 820 cqr->startdev != block->base, 821 cqr->cpmode == 1, 822 rq_data_dir(req) == READ, 823 sectors, sectors_ind, tottime_ind, 824 tottimeps_ind, strtime_ind, 825 irqtime_ind, irqtimeps_ind, 826 endtime_ind); 827 spin_unlock(&block->profile.lock); 828 829 spin_lock(&device->profile.lock); 830 if (device->profile.data) 831 dasd_profile_end_add_data(device->profile.data, 832 cqr->startdev != block->base, 833 cqr->cpmode == 1, 834 rq_data_dir(req) == READ, 835 sectors, sectors_ind, tottime_ind, 836 tottimeps_ind, strtime_ind, 837 irqtime_ind, irqtimeps_ind, 838 endtime_ind); 839 spin_unlock(&device->profile.lock); 840 } 841 842 void dasd_profile_reset(struct dasd_profile *profile) 843 { 844 struct dasd_profile_info *data; 845 846 spin_lock_bh(&profile->lock); 847 data = profile->data; 848 if (!data) { 849 spin_unlock_bh(&profile->lock); 850 return; 851 } 852 memset(data, 0, sizeof(*data)); 853 getnstimeofday(&data->starttod); 854 spin_unlock_bh(&profile->lock); 855 } 856 857 void dasd_global_profile_reset(void) 858 { 859 memset(&dasd_global_profile_data, 0, sizeof(dasd_global_profile_data)); 860 getnstimeofday(&dasd_global_profile_data.starttod); 861 } 862 863 int dasd_profile_on(struct dasd_profile *profile) 864 { 865 struct dasd_profile_info *data; 866 867 data = kzalloc(sizeof(*data), GFP_KERNEL); 868 if (!data) 869 return -ENOMEM; 870 spin_lock_bh(&profile->lock); 871 if (profile->data) { 872 spin_unlock_bh(&profile->lock); 873 kfree(data); 874 return 0; 875 } 876 getnstimeofday(&data->starttod); 877 profile->data = data; 878 spin_unlock_bh(&profile->lock); 879 return 0; 880 } 881 882 void dasd_profile_off(struct dasd_profile *profile) 883 { 884 spin_lock_bh(&profile->lock); 885 kfree(profile->data); 886 profile->data = NULL; 887 spin_unlock_bh(&profile->lock); 888 } 889 890 char *dasd_get_user_string(const char __user *user_buf, size_t user_len) 891 { 892 char *buffer; 893 894 buffer = vmalloc(user_len + 1); 895 if (buffer == NULL) 896 return ERR_PTR(-ENOMEM); 897 if (copy_from_user(buffer, user_buf, user_len) != 0) { 898 vfree(buffer); 899 return ERR_PTR(-EFAULT); 900 } 901 /* got the string, now strip linefeed. */ 902 if (buffer[user_len - 1] == '\n') 903 buffer[user_len - 1] = 0; 904 else 905 buffer[user_len] = 0; 906 return buffer; 907 } 908 909 static ssize_t dasd_stats_write(struct file *file, 910 const char __user *user_buf, 911 size_t user_len, loff_t *pos) 912 { 913 char *buffer, *str; 914 int rc; 915 struct seq_file *m = (struct seq_file *)file->private_data; 916 struct dasd_profile *prof = m->private; 917 918 if (user_len > 65536) 919 user_len = 65536; 920 buffer = dasd_get_user_string(user_buf, user_len); 921 if (IS_ERR(buffer)) 922 return PTR_ERR(buffer); 923 924 str = skip_spaces(buffer); 925 rc = user_len; 926 if (strncmp(str, "reset", 5) == 0) { 927 dasd_profile_reset(prof); 928 } else if (strncmp(str, "on", 2) == 0) { 929 rc = dasd_profile_on(prof); 930 if (!rc) 931 rc = user_len; 932 } else if (strncmp(str, "off", 3) == 0) { 933 dasd_profile_off(prof); 934 } else 935 rc = -EINVAL; 936 vfree(buffer); 937 return rc; 938 } 939 940 static void dasd_stats_array(struct seq_file *m, unsigned int *array) 941 { 942 int i; 943 944 for (i = 0; i < 32; i++) 945 seq_printf(m, "%u ", array[i]); 946 seq_putc(m, '\n'); 947 } 948 949 static void dasd_stats_seq_print(struct seq_file *m, 950 struct dasd_profile_info *data) 951 { 952 seq_printf(m, "start_time %ld.%09ld\n", 953 data->starttod.tv_sec, data->starttod.tv_nsec); 954 seq_printf(m, "total_requests %u\n", data->dasd_io_reqs); 955 seq_printf(m, "total_sectors %u\n", data->dasd_io_sects); 956 seq_printf(m, "total_pav %u\n", data->dasd_io_alias); 957 seq_printf(m, "total_hpf %u\n", data->dasd_io_tpm); 958 seq_printf(m, "histogram_sectors "); 959 dasd_stats_array(m, data->dasd_io_secs); 960 seq_printf(m, "histogram_io_times "); 961 dasd_stats_array(m, data->dasd_io_times); 962 seq_printf(m, "histogram_io_times_weighted "); 963 dasd_stats_array(m, data->dasd_io_timps); 964 seq_printf(m, "histogram_time_build_to_ssch "); 965 dasd_stats_array(m, data->dasd_io_time1); 966 seq_printf(m, "histogram_time_ssch_to_irq "); 967 dasd_stats_array(m, data->dasd_io_time2); 968 seq_printf(m, "histogram_time_ssch_to_irq_weighted "); 969 dasd_stats_array(m, data->dasd_io_time2ps); 970 seq_printf(m, "histogram_time_irq_to_end "); 971 dasd_stats_array(m, data->dasd_io_time3); 972 seq_printf(m, "histogram_ccw_queue_length "); 973 dasd_stats_array(m, data->dasd_io_nr_req); 974 seq_printf(m, "total_read_requests %u\n", data->dasd_read_reqs); 975 seq_printf(m, "total_read_sectors %u\n", data->dasd_read_sects); 976 seq_printf(m, "total_read_pav %u\n", data->dasd_read_alias); 977 seq_printf(m, "total_read_hpf %u\n", data->dasd_read_tpm); 978 seq_printf(m, "histogram_read_sectors "); 979 dasd_stats_array(m, data->dasd_read_secs); 980 seq_printf(m, "histogram_read_times "); 981 dasd_stats_array(m, data->dasd_read_times); 982 seq_printf(m, "histogram_read_time_build_to_ssch "); 983 dasd_stats_array(m, data->dasd_read_time1); 984 seq_printf(m, "histogram_read_time_ssch_to_irq "); 985 dasd_stats_array(m, data->dasd_read_time2); 986 seq_printf(m, "histogram_read_time_irq_to_end "); 987 dasd_stats_array(m, data->dasd_read_time3); 988 seq_printf(m, "histogram_read_ccw_queue_length "); 989 dasd_stats_array(m, data->dasd_read_nr_req); 990 } 991 992 static int dasd_stats_show(struct seq_file *m, void *v) 993 { 994 struct dasd_profile *profile; 995 struct dasd_profile_info *data; 996 997 profile = m->private; 998 spin_lock_bh(&profile->lock); 999 data = profile->data; 1000 if (!data) { 1001 spin_unlock_bh(&profile->lock); 1002 seq_printf(m, "disabled\n"); 1003 return 0; 1004 } 1005 dasd_stats_seq_print(m, data); 1006 spin_unlock_bh(&profile->lock); 1007 return 0; 1008 } 1009 1010 static int dasd_stats_open(struct inode *inode, struct file *file) 1011 { 1012 struct dasd_profile *profile = inode->i_private; 1013 return single_open(file, dasd_stats_show, profile); 1014 } 1015 1016 static const struct file_operations dasd_stats_raw_fops = { 1017 .owner = THIS_MODULE, 1018 .open = dasd_stats_open, 1019 .read = seq_read, 1020 .llseek = seq_lseek, 1021 .release = single_release, 1022 .write = dasd_stats_write, 1023 }; 1024 1025 static ssize_t dasd_stats_global_write(struct file *file, 1026 const char __user *user_buf, 1027 size_t user_len, loff_t *pos) 1028 { 1029 char *buffer, *str; 1030 ssize_t rc; 1031 1032 if (user_len > 65536) 1033 user_len = 65536; 1034 buffer = dasd_get_user_string(user_buf, user_len); 1035 if (IS_ERR(buffer)) 1036 return PTR_ERR(buffer); 1037 str = skip_spaces(buffer); 1038 rc = user_len; 1039 if (strncmp(str, "reset", 5) == 0) { 1040 dasd_global_profile_reset(); 1041 } else if (strncmp(str, "on", 2) == 0) { 1042 dasd_global_profile_reset(); 1043 dasd_global_profile_level = DASD_PROFILE_GLOBAL_ONLY; 1044 } else if (strncmp(str, "off", 3) == 0) { 1045 dasd_global_profile_level = DASD_PROFILE_OFF; 1046 } else 1047 rc = -EINVAL; 1048 vfree(buffer); 1049 return rc; 1050 } 1051 1052 static int dasd_stats_global_show(struct seq_file *m, void *v) 1053 { 1054 if (!dasd_global_profile_level) { 1055 seq_printf(m, "disabled\n"); 1056 return 0; 1057 } 1058 dasd_stats_seq_print(m, &dasd_global_profile_data); 1059 return 0; 1060 } 1061 1062 static int dasd_stats_global_open(struct inode *inode, struct file *file) 1063 { 1064 return single_open(file, dasd_stats_global_show, NULL); 1065 } 1066 1067 static const struct file_operations dasd_stats_global_fops = { 1068 .owner = THIS_MODULE, 1069 .open = dasd_stats_global_open, 1070 .read = seq_read, 1071 .llseek = seq_lseek, 1072 .release = single_release, 1073 .write = dasd_stats_global_write, 1074 }; 1075 1076 static void dasd_profile_init(struct dasd_profile *profile, 1077 struct dentry *base_dentry) 1078 { 1079 umode_t mode; 1080 struct dentry *pde; 1081 1082 if (!base_dentry) 1083 return; 1084 profile->dentry = NULL; 1085 profile->data = NULL; 1086 mode = (S_IRUSR | S_IWUSR | S_IFREG); 1087 pde = debugfs_create_file("statistics", mode, base_dentry, 1088 profile, &dasd_stats_raw_fops); 1089 if (pde && !IS_ERR(pde)) 1090 profile->dentry = pde; 1091 return; 1092 } 1093 1094 static void dasd_profile_exit(struct dasd_profile *profile) 1095 { 1096 dasd_profile_off(profile); 1097 if (profile->dentry) { 1098 debugfs_remove(profile->dentry); 1099 profile->dentry = NULL; 1100 } 1101 } 1102 1103 static void dasd_statistics_removeroot(void) 1104 { 1105 dasd_global_profile_level = DASD_PROFILE_OFF; 1106 if (dasd_global_profile_dentry) { 1107 debugfs_remove(dasd_global_profile_dentry); 1108 dasd_global_profile_dentry = NULL; 1109 } 1110 if (dasd_debugfs_global_entry) 1111 debugfs_remove(dasd_debugfs_global_entry); 1112 if (dasd_debugfs_root_entry) 1113 debugfs_remove(dasd_debugfs_root_entry); 1114 } 1115 1116 static void dasd_statistics_createroot(void) 1117 { 1118 umode_t mode; 1119 struct dentry *pde; 1120 1121 dasd_debugfs_root_entry = NULL; 1122 dasd_debugfs_global_entry = NULL; 1123 dasd_global_profile_dentry = NULL; 1124 pde = debugfs_create_dir("dasd", NULL); 1125 if (!pde || IS_ERR(pde)) 1126 goto error; 1127 dasd_debugfs_root_entry = pde; 1128 pde = debugfs_create_dir("global", dasd_debugfs_root_entry); 1129 if (!pde || IS_ERR(pde)) 1130 goto error; 1131 dasd_debugfs_global_entry = pde; 1132 1133 mode = (S_IRUSR | S_IWUSR | S_IFREG); 1134 pde = debugfs_create_file("statistics", mode, dasd_debugfs_global_entry, 1135 NULL, &dasd_stats_global_fops); 1136 if (!pde || IS_ERR(pde)) 1137 goto error; 1138 dasd_global_profile_dentry = pde; 1139 return; 1140 1141 error: 1142 DBF_EVENT(DBF_ERR, "%s", 1143 "Creation of the dasd debugfs interface failed"); 1144 dasd_statistics_removeroot(); 1145 return; 1146 } 1147 1148 #else 1149 #define dasd_profile_start(block, cqr, req) do {} while (0) 1150 #define dasd_profile_end(block, cqr, req) do {} while (0) 1151 1152 static void dasd_statistics_createroot(void) 1153 { 1154 return; 1155 } 1156 1157 static void dasd_statistics_removeroot(void) 1158 { 1159 return; 1160 } 1161 1162 int dasd_stats_generic_show(struct seq_file *m, void *v) 1163 { 1164 seq_printf(m, "Statistics are not activated in this kernel\n"); 1165 return 0; 1166 } 1167 1168 static void dasd_profile_init(struct dasd_profile *profile, 1169 struct dentry *base_dentry) 1170 { 1171 return; 1172 } 1173 1174 static void dasd_profile_exit(struct dasd_profile *profile) 1175 { 1176 return; 1177 } 1178 1179 int dasd_profile_on(struct dasd_profile *profile) 1180 { 1181 return 0; 1182 } 1183 1184 #endif /* CONFIG_DASD_PROFILE */ 1185 1186 /* 1187 * Allocate memory for a channel program with 'cplength' channel 1188 * command words and 'datasize' additional space. There are two 1189 * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed 1190 * memory and 2) dasd_smalloc_request uses the static ccw memory 1191 * that gets allocated for each device. 1192 */ 1193 struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength, 1194 int datasize, 1195 struct dasd_device *device) 1196 { 1197 struct dasd_ccw_req *cqr; 1198 1199 /* Sanity checks */ 1200 BUG_ON(datasize > PAGE_SIZE || 1201 (cplength*sizeof(struct ccw1)) > PAGE_SIZE); 1202 1203 cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC); 1204 if (cqr == NULL) 1205 return ERR_PTR(-ENOMEM); 1206 cqr->cpaddr = NULL; 1207 if (cplength > 0) { 1208 cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1), 1209 GFP_ATOMIC | GFP_DMA); 1210 if (cqr->cpaddr == NULL) { 1211 kfree(cqr); 1212 return ERR_PTR(-ENOMEM); 1213 } 1214 } 1215 cqr->data = NULL; 1216 if (datasize > 0) { 1217 cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA); 1218 if (cqr->data == NULL) { 1219 kfree(cqr->cpaddr); 1220 kfree(cqr); 1221 return ERR_PTR(-ENOMEM); 1222 } 1223 } 1224 cqr->magic = magic; 1225 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); 1226 dasd_get_device(device); 1227 return cqr; 1228 } 1229 1230 struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength, 1231 int datasize, 1232 struct dasd_device *device) 1233 { 1234 unsigned long flags; 1235 struct dasd_ccw_req *cqr; 1236 char *data; 1237 int size; 1238 1239 size = (sizeof(struct dasd_ccw_req) + 7L) & -8L; 1240 if (cplength > 0) 1241 size += cplength * sizeof(struct ccw1); 1242 if (datasize > 0) 1243 size += datasize; 1244 spin_lock_irqsave(&device->mem_lock, flags); 1245 cqr = (struct dasd_ccw_req *) 1246 dasd_alloc_chunk(&device->ccw_chunks, size); 1247 spin_unlock_irqrestore(&device->mem_lock, flags); 1248 if (cqr == NULL) 1249 return ERR_PTR(-ENOMEM); 1250 memset(cqr, 0, sizeof(struct dasd_ccw_req)); 1251 data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L); 1252 cqr->cpaddr = NULL; 1253 if (cplength > 0) { 1254 cqr->cpaddr = (struct ccw1 *) data; 1255 data += cplength*sizeof(struct ccw1); 1256 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1)); 1257 } 1258 cqr->data = NULL; 1259 if (datasize > 0) { 1260 cqr->data = data; 1261 memset(cqr->data, 0, datasize); 1262 } 1263 cqr->magic = magic; 1264 set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags); 1265 dasd_get_device(device); 1266 return cqr; 1267 } 1268 1269 /* 1270 * Free memory of a channel program. This function needs to free all the 1271 * idal lists that might have been created by dasd_set_cda and the 1272 * struct dasd_ccw_req itself. 1273 */ 1274 void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) 1275 { 1276 #ifdef CONFIG_64BIT 1277 struct ccw1 *ccw; 1278 1279 /* Clear any idals used for the request. */ 1280 ccw = cqr->cpaddr; 1281 do { 1282 clear_normalized_cda(ccw); 1283 } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC)); 1284 #endif 1285 kfree(cqr->cpaddr); 1286 kfree(cqr->data); 1287 kfree(cqr); 1288 dasd_put_device(device); 1289 } 1290 1291 void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device) 1292 { 1293 unsigned long flags; 1294 1295 spin_lock_irqsave(&device->mem_lock, flags); 1296 dasd_free_chunk(&device->ccw_chunks, cqr); 1297 spin_unlock_irqrestore(&device->mem_lock, flags); 1298 dasd_put_device(device); 1299 } 1300 1301 /* 1302 * Check discipline magic in cqr. 1303 */ 1304 static inline int dasd_check_cqr(struct dasd_ccw_req *cqr) 1305 { 1306 struct dasd_device *device; 1307 1308 if (cqr == NULL) 1309 return -EINVAL; 1310 device = cqr->startdev; 1311 if (strncmp((char *) &cqr->magic, device->discipline->ebcname, 4)) { 1312 DBF_DEV_EVENT(DBF_WARNING, device, 1313 " dasd_ccw_req 0x%08x magic doesn't match" 1314 " discipline 0x%08x", 1315 cqr->magic, 1316 *(unsigned int *) device->discipline->name); 1317 return -EINVAL; 1318 } 1319 return 0; 1320 } 1321 1322 /* 1323 * Terminate the current i/o and set the request to clear_pending. 1324 * Timer keeps device runnig. 1325 * ccw_device_clear can fail if the i/o subsystem 1326 * is in a bad mood. 1327 */ 1328 int dasd_term_IO(struct dasd_ccw_req *cqr) 1329 { 1330 struct dasd_device *device; 1331 int retries, rc; 1332 char errorstring[ERRORLENGTH]; 1333 1334 /* Check the cqr */ 1335 rc = dasd_check_cqr(cqr); 1336 if (rc) 1337 return rc; 1338 retries = 0; 1339 device = (struct dasd_device *) cqr->startdev; 1340 while ((retries < 5) && (cqr->status == DASD_CQR_IN_IO)) { 1341 rc = ccw_device_clear(device->cdev, (long) cqr); 1342 switch (rc) { 1343 case 0: /* termination successful */ 1344 cqr->status = DASD_CQR_CLEAR_PENDING; 1345 cqr->stopclk = get_clock(); 1346 cqr->starttime = 0; 1347 DBF_DEV_EVENT(DBF_DEBUG, device, 1348 "terminate cqr %p successful", 1349 cqr); 1350 break; 1351 case -ENODEV: 1352 DBF_DEV_EVENT(DBF_ERR, device, "%s", 1353 "device gone, retry"); 1354 break; 1355 case -EIO: 1356 DBF_DEV_EVENT(DBF_ERR, device, "%s", 1357 "I/O error, retry"); 1358 break; 1359 case -EINVAL: 1360 case -EBUSY: 1361 DBF_DEV_EVENT(DBF_ERR, device, "%s", 1362 "device busy, retry later"); 1363 break; 1364 default: 1365 /* internal error 10 - unknown rc*/ 1366 snprintf(errorstring, ERRORLENGTH, "10 %d", rc); 1367 dev_err(&device->cdev->dev, "An error occurred in the " 1368 "DASD device driver, reason=%s\n", errorstring); 1369 BUG(); 1370 break; 1371 } 1372 retries++; 1373 } 1374 dasd_schedule_device_bh(device); 1375 return rc; 1376 } 1377 1378 /* 1379 * Start the i/o. This start_IO can fail if the channel is really busy. 1380 * In that case set up a timer to start the request later. 1381 */ 1382 int dasd_start_IO(struct dasd_ccw_req *cqr) 1383 { 1384 struct dasd_device *device; 1385 int rc; 1386 char errorstring[ERRORLENGTH]; 1387 1388 /* Check the cqr */ 1389 rc = dasd_check_cqr(cqr); 1390 if (rc) { 1391 cqr->intrc = rc; 1392 return rc; 1393 } 1394 device = (struct dasd_device *) cqr->startdev; 1395 if (((cqr->block && 1396 test_bit(DASD_FLAG_LOCK_STOLEN, &cqr->block->base->flags)) || 1397 test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) && 1398 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { 1399 DBF_DEV_EVENT(DBF_DEBUG, device, "start_IO: return request %p " 1400 "because of stolen lock", cqr); 1401 cqr->status = DASD_CQR_ERROR; 1402 cqr->intrc = -EPERM; 1403 return -EPERM; 1404 } 1405 if (cqr->retries < 0) { 1406 /* internal error 14 - start_IO run out of retries */ 1407 sprintf(errorstring, "14 %p", cqr); 1408 dev_err(&device->cdev->dev, "An error occurred in the DASD " 1409 "device driver, reason=%s\n", errorstring); 1410 cqr->status = DASD_CQR_ERROR; 1411 return -EIO; 1412 } 1413 cqr->startclk = get_clock(); 1414 cqr->starttime = jiffies; 1415 cqr->retries--; 1416 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { 1417 cqr->lpm &= device->path_data.opm; 1418 if (!cqr->lpm) 1419 cqr->lpm = device->path_data.opm; 1420 } 1421 if (cqr->cpmode == 1) { 1422 rc = ccw_device_tm_start(device->cdev, cqr->cpaddr, 1423 (long) cqr, cqr->lpm); 1424 } else { 1425 rc = ccw_device_start(device->cdev, cqr->cpaddr, 1426 (long) cqr, cqr->lpm, 0); 1427 } 1428 switch (rc) { 1429 case 0: 1430 cqr->status = DASD_CQR_IN_IO; 1431 break; 1432 case -EBUSY: 1433 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1434 "start_IO: device busy, retry later"); 1435 break; 1436 case -ETIMEDOUT: 1437 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1438 "start_IO: request timeout, retry later"); 1439 break; 1440 case -EACCES: 1441 /* -EACCES indicates that the request used only a subset of the 1442 * available paths and all these paths are gone. If the lpm of 1443 * this request was only a subset of the opm (e.g. the ppm) then 1444 * we just do a retry with all available paths. 1445 * If we already use the full opm, something is amiss, and we 1446 * need a full path verification. 1447 */ 1448 if (test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) { 1449 DBF_DEV_EVENT(DBF_WARNING, device, 1450 "start_IO: selected paths gone (%x)", 1451 cqr->lpm); 1452 } else if (cqr->lpm != device->path_data.opm) { 1453 cqr->lpm = device->path_data.opm; 1454 DBF_DEV_EVENT(DBF_DEBUG, device, "%s", 1455 "start_IO: selected paths gone," 1456 " retry on all paths"); 1457 } else { 1458 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1459 "start_IO: all paths in opm gone," 1460 " do path verification"); 1461 dasd_generic_last_path_gone(device); 1462 device->path_data.opm = 0; 1463 device->path_data.ppm = 0; 1464 device->path_data.npm = 0; 1465 device->path_data.tbvpm = 1466 ccw_device_get_path_mask(device->cdev); 1467 } 1468 break; 1469 case -ENODEV: 1470 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1471 "start_IO: -ENODEV device gone, retry"); 1472 break; 1473 case -EIO: 1474 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1475 "start_IO: -EIO device gone, retry"); 1476 break; 1477 case -EINVAL: 1478 /* most likely caused in power management context */ 1479 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1480 "start_IO: -EINVAL device currently " 1481 "not accessible"); 1482 break; 1483 default: 1484 /* internal error 11 - unknown rc */ 1485 snprintf(errorstring, ERRORLENGTH, "11 %d", rc); 1486 dev_err(&device->cdev->dev, 1487 "An error occurred in the DASD device driver, " 1488 "reason=%s\n", errorstring); 1489 BUG(); 1490 break; 1491 } 1492 cqr->intrc = rc; 1493 return rc; 1494 } 1495 1496 /* 1497 * Timeout function for dasd devices. This is used for different purposes 1498 * 1) missing interrupt handler for normal operation 1499 * 2) delayed start of request where start_IO failed with -EBUSY 1500 * 3) timeout for missing state change interrupts 1501 * The head of the ccw queue will have status DASD_CQR_IN_IO for 1), 1502 * DASD_CQR_QUEUED for 2) and 3). 1503 */ 1504 static void dasd_device_timeout(unsigned long ptr) 1505 { 1506 unsigned long flags; 1507 struct dasd_device *device; 1508 1509 device = (struct dasd_device *) ptr; 1510 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 1511 /* re-activate request queue */ 1512 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING); 1513 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 1514 dasd_schedule_device_bh(device); 1515 } 1516 1517 /* 1518 * Setup timeout for a device in jiffies. 1519 */ 1520 void dasd_device_set_timer(struct dasd_device *device, int expires) 1521 { 1522 if (expires == 0) 1523 del_timer(&device->timer); 1524 else 1525 mod_timer(&device->timer, jiffies + expires); 1526 } 1527 1528 /* 1529 * Clear timeout for a device. 1530 */ 1531 void dasd_device_clear_timer(struct dasd_device *device) 1532 { 1533 del_timer(&device->timer); 1534 } 1535 1536 static void dasd_handle_killed_request(struct ccw_device *cdev, 1537 unsigned long intparm) 1538 { 1539 struct dasd_ccw_req *cqr; 1540 struct dasd_device *device; 1541 1542 if (!intparm) 1543 return; 1544 cqr = (struct dasd_ccw_req *) intparm; 1545 if (cqr->status != DASD_CQR_IN_IO) { 1546 DBF_EVENT_DEVID(DBF_DEBUG, cdev, 1547 "invalid status in handle_killed_request: " 1548 "%02x", cqr->status); 1549 return; 1550 } 1551 1552 device = dasd_device_from_cdev_locked(cdev); 1553 if (IS_ERR(device)) { 1554 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", 1555 "unable to get device from cdev"); 1556 return; 1557 } 1558 1559 if (!cqr->startdev || 1560 device != cqr->startdev || 1561 strncmp(cqr->startdev->discipline->ebcname, 1562 (char *) &cqr->magic, 4)) { 1563 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", 1564 "invalid device in request"); 1565 dasd_put_device(device); 1566 return; 1567 } 1568 1569 /* Schedule request to be retried. */ 1570 cqr->status = DASD_CQR_QUEUED; 1571 1572 dasd_device_clear_timer(device); 1573 dasd_schedule_device_bh(device); 1574 dasd_put_device(device); 1575 } 1576 1577 void dasd_generic_handle_state_change(struct dasd_device *device) 1578 { 1579 /* First of all start sense subsystem status request. */ 1580 dasd_eer_snss(device); 1581 1582 dasd_device_remove_stop_bits(device, DASD_STOPPED_PENDING); 1583 dasd_schedule_device_bh(device); 1584 if (device->block) 1585 dasd_schedule_block_bh(device->block); 1586 } 1587 1588 /* 1589 * Interrupt handler for "normal" ssch-io based dasd devices. 1590 */ 1591 void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, 1592 struct irb *irb) 1593 { 1594 struct dasd_ccw_req *cqr, *next; 1595 struct dasd_device *device; 1596 unsigned long long now; 1597 int expires; 1598 1599 if (IS_ERR(irb)) { 1600 switch (PTR_ERR(irb)) { 1601 case -EIO: 1602 break; 1603 case -ETIMEDOUT: 1604 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: " 1605 "request timed out\n", __func__); 1606 break; 1607 default: 1608 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: " 1609 "unknown error %ld\n", __func__, 1610 PTR_ERR(irb)); 1611 } 1612 dasd_handle_killed_request(cdev, intparm); 1613 return; 1614 } 1615 1616 now = get_clock(); 1617 cqr = (struct dasd_ccw_req *) intparm; 1618 /* check for conditions that should be handled immediately */ 1619 if (!cqr || 1620 !(scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && 1621 scsw_cstat(&irb->scsw) == 0)) { 1622 if (cqr) 1623 memcpy(&cqr->irb, irb, sizeof(*irb)); 1624 device = dasd_device_from_cdev_locked(cdev); 1625 if (IS_ERR(device)) 1626 return; 1627 /* ignore unsolicited interrupts for DIAG discipline */ 1628 if (device->discipline == dasd_diag_discipline_pointer) { 1629 dasd_put_device(device); 1630 return; 1631 } 1632 device->discipline->dump_sense_dbf(device, irb, "int"); 1633 if (device->features & DASD_FEATURE_ERPLOG) 1634 device->discipline->dump_sense(device, cqr, irb); 1635 device->discipline->check_for_device_change(device, cqr, irb); 1636 dasd_put_device(device); 1637 } 1638 if (!cqr) 1639 return; 1640 1641 device = (struct dasd_device *) cqr->startdev; 1642 if (!device || 1643 strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { 1644 DBF_EVENT_DEVID(DBF_DEBUG, cdev, "%s", 1645 "invalid device in request"); 1646 return; 1647 } 1648 1649 /* Check for clear pending */ 1650 if (cqr->status == DASD_CQR_CLEAR_PENDING && 1651 scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) { 1652 cqr->status = DASD_CQR_CLEARED; 1653 dasd_device_clear_timer(device); 1654 wake_up(&dasd_flush_wq); 1655 dasd_schedule_device_bh(device); 1656 return; 1657 } 1658 1659 /* check status - the request might have been killed by dyn detach */ 1660 if (cqr->status != DASD_CQR_IN_IO) { 1661 DBF_DEV_EVENT(DBF_DEBUG, device, "invalid status: bus_id %s, " 1662 "status %02x", dev_name(&cdev->dev), cqr->status); 1663 return; 1664 } 1665 1666 next = NULL; 1667 expires = 0; 1668 if (scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) && 1669 scsw_cstat(&irb->scsw) == 0) { 1670 /* request was completed successfully */ 1671 cqr->status = DASD_CQR_SUCCESS; 1672 cqr->stopclk = now; 1673 /* Start first request on queue if possible -> fast_io. */ 1674 if (cqr->devlist.next != &device->ccw_queue) { 1675 next = list_entry(cqr->devlist.next, 1676 struct dasd_ccw_req, devlist); 1677 } 1678 } else { /* error */ 1679 /* 1680 * If we don't want complex ERP for this request, then just 1681 * reset this and retry it in the fastpath 1682 */ 1683 if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) && 1684 cqr->retries > 0) { 1685 if (cqr->lpm == device->path_data.opm) 1686 DBF_DEV_EVENT(DBF_DEBUG, device, 1687 "default ERP in fastpath " 1688 "(%i retries left)", 1689 cqr->retries); 1690 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) 1691 cqr->lpm = device->path_data.opm; 1692 cqr->status = DASD_CQR_QUEUED; 1693 next = cqr; 1694 } else 1695 cqr->status = DASD_CQR_ERROR; 1696 } 1697 if (next && (next->status == DASD_CQR_QUEUED) && 1698 (!device->stopped)) { 1699 if (device->discipline->start_IO(next) == 0) 1700 expires = next->expires; 1701 } 1702 if (expires != 0) 1703 dasd_device_set_timer(device, expires); 1704 else 1705 dasd_device_clear_timer(device); 1706 dasd_schedule_device_bh(device); 1707 } 1708 1709 enum uc_todo dasd_generic_uc_handler(struct ccw_device *cdev, struct irb *irb) 1710 { 1711 struct dasd_device *device; 1712 1713 device = dasd_device_from_cdev_locked(cdev); 1714 1715 if (IS_ERR(device)) 1716 goto out; 1717 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) || 1718 device->state != device->target || 1719 !device->discipline->check_for_device_change){ 1720 dasd_put_device(device); 1721 goto out; 1722 } 1723 if (device->discipline->dump_sense_dbf) 1724 device->discipline->dump_sense_dbf(device, irb, "uc"); 1725 device->discipline->check_for_device_change(device, NULL, irb); 1726 dasd_put_device(device); 1727 out: 1728 return UC_TODO_RETRY; 1729 } 1730 EXPORT_SYMBOL_GPL(dasd_generic_uc_handler); 1731 1732 /* 1733 * If we have an error on a dasd_block layer request then we cancel 1734 * and return all further requests from the same dasd_block as well. 1735 */ 1736 static void __dasd_device_recovery(struct dasd_device *device, 1737 struct dasd_ccw_req *ref_cqr) 1738 { 1739 struct list_head *l, *n; 1740 struct dasd_ccw_req *cqr; 1741 1742 /* 1743 * only requeue request that came from the dasd_block layer 1744 */ 1745 if (!ref_cqr->block) 1746 return; 1747 1748 list_for_each_safe(l, n, &device->ccw_queue) { 1749 cqr = list_entry(l, struct dasd_ccw_req, devlist); 1750 if (cqr->status == DASD_CQR_QUEUED && 1751 ref_cqr->block == cqr->block) { 1752 cqr->status = DASD_CQR_CLEARED; 1753 } 1754 } 1755 }; 1756 1757 /* 1758 * Remove those ccw requests from the queue that need to be returned 1759 * to the upper layer. 1760 */ 1761 static void __dasd_device_process_ccw_queue(struct dasd_device *device, 1762 struct list_head *final_queue) 1763 { 1764 struct list_head *l, *n; 1765 struct dasd_ccw_req *cqr; 1766 1767 /* Process request with final status. */ 1768 list_for_each_safe(l, n, &device->ccw_queue) { 1769 cqr = list_entry(l, struct dasd_ccw_req, devlist); 1770 1771 /* Stop list processing at the first non-final request. */ 1772 if (cqr->status == DASD_CQR_QUEUED || 1773 cqr->status == DASD_CQR_IN_IO || 1774 cqr->status == DASD_CQR_CLEAR_PENDING) 1775 break; 1776 if (cqr->status == DASD_CQR_ERROR) { 1777 __dasd_device_recovery(device, cqr); 1778 } 1779 /* Rechain finished requests to final queue */ 1780 list_move_tail(&cqr->devlist, final_queue); 1781 } 1782 } 1783 1784 /* 1785 * the cqrs from the final queue are returned to the upper layer 1786 * by setting a dasd_block state and calling the callback function 1787 */ 1788 static void __dasd_device_process_final_queue(struct dasd_device *device, 1789 struct list_head *final_queue) 1790 { 1791 struct list_head *l, *n; 1792 struct dasd_ccw_req *cqr; 1793 struct dasd_block *block; 1794 void (*callback)(struct dasd_ccw_req *, void *data); 1795 void *callback_data; 1796 char errorstring[ERRORLENGTH]; 1797 1798 list_for_each_safe(l, n, final_queue) { 1799 cqr = list_entry(l, struct dasd_ccw_req, devlist); 1800 list_del_init(&cqr->devlist); 1801 block = cqr->block; 1802 callback = cqr->callback; 1803 callback_data = cqr->callback_data; 1804 if (block) 1805 spin_lock_bh(&block->queue_lock); 1806 switch (cqr->status) { 1807 case DASD_CQR_SUCCESS: 1808 cqr->status = DASD_CQR_DONE; 1809 break; 1810 case DASD_CQR_ERROR: 1811 cqr->status = DASD_CQR_NEED_ERP; 1812 break; 1813 case DASD_CQR_CLEARED: 1814 cqr->status = DASD_CQR_TERMINATED; 1815 break; 1816 default: 1817 /* internal error 12 - wrong cqr status*/ 1818 snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status); 1819 dev_err(&device->cdev->dev, 1820 "An error occurred in the DASD device driver, " 1821 "reason=%s\n", errorstring); 1822 BUG(); 1823 } 1824 if (cqr->callback != NULL) 1825 (callback)(cqr, callback_data); 1826 if (block) 1827 spin_unlock_bh(&block->queue_lock); 1828 } 1829 } 1830 1831 /* 1832 * Take a look at the first request on the ccw queue and check 1833 * if it reached its expire time. If so, terminate the IO. 1834 */ 1835 static void __dasd_device_check_expire(struct dasd_device *device) 1836 { 1837 struct dasd_ccw_req *cqr; 1838 1839 if (list_empty(&device->ccw_queue)) 1840 return; 1841 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); 1842 if ((cqr->status == DASD_CQR_IN_IO && cqr->expires != 0) && 1843 (time_after_eq(jiffies, cqr->expires + cqr->starttime))) { 1844 if (device->discipline->term_IO(cqr) != 0) { 1845 /* Hmpf, try again in 5 sec */ 1846 dev_err(&device->cdev->dev, 1847 "cqr %p timed out (%lus) but cannot be " 1848 "ended, retrying in 5 s\n", 1849 cqr, (cqr->expires/HZ)); 1850 cqr->expires += 5*HZ; 1851 dasd_device_set_timer(device, 5*HZ); 1852 } else { 1853 dev_err(&device->cdev->dev, 1854 "cqr %p timed out (%lus), %i retries " 1855 "remaining\n", cqr, (cqr->expires/HZ), 1856 cqr->retries); 1857 } 1858 } 1859 } 1860 1861 /* 1862 * Take a look at the first request on the ccw queue and check 1863 * if it needs to be started. 1864 */ 1865 static void __dasd_device_start_head(struct dasd_device *device) 1866 { 1867 struct dasd_ccw_req *cqr; 1868 int rc; 1869 1870 if (list_empty(&device->ccw_queue)) 1871 return; 1872 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); 1873 if (cqr->status != DASD_CQR_QUEUED) 1874 return; 1875 /* when device is stopped, return request to previous layer 1876 * exception: only the disconnect or unresumed bits are set and the 1877 * cqr is a path verification request 1878 */ 1879 if (device->stopped && 1880 !(!(device->stopped & ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM)) 1881 && test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))) { 1882 cqr->intrc = -EAGAIN; 1883 cqr->status = DASD_CQR_CLEARED; 1884 dasd_schedule_device_bh(device); 1885 return; 1886 } 1887 1888 rc = device->discipline->start_IO(cqr); 1889 if (rc == 0) 1890 dasd_device_set_timer(device, cqr->expires); 1891 else if (rc == -EACCES) { 1892 dasd_schedule_device_bh(device); 1893 } else 1894 /* Hmpf, try again in 1/2 sec */ 1895 dasd_device_set_timer(device, 50); 1896 } 1897 1898 static void __dasd_device_check_path_events(struct dasd_device *device) 1899 { 1900 int rc; 1901 1902 if (device->path_data.tbvpm) { 1903 if (device->stopped & ~(DASD_STOPPED_DC_WAIT | 1904 DASD_UNRESUMED_PM)) 1905 return; 1906 rc = device->discipline->verify_path( 1907 device, device->path_data.tbvpm); 1908 if (rc) 1909 dasd_device_set_timer(device, 50); 1910 else 1911 device->path_data.tbvpm = 0; 1912 } 1913 }; 1914 1915 /* 1916 * Go through all request on the dasd_device request queue, 1917 * terminate them on the cdev if necessary, and return them to the 1918 * submitting layer via callback. 1919 * Note: 1920 * Make sure that all 'submitting layers' still exist when 1921 * this function is called!. In other words, when 'device' is a base 1922 * device then all block layer requests must have been removed before 1923 * via dasd_flush_block_queue. 1924 */ 1925 int dasd_flush_device_queue(struct dasd_device *device) 1926 { 1927 struct dasd_ccw_req *cqr, *n; 1928 int rc; 1929 struct list_head flush_queue; 1930 1931 INIT_LIST_HEAD(&flush_queue); 1932 spin_lock_irq(get_ccwdev_lock(device->cdev)); 1933 rc = 0; 1934 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { 1935 /* Check status and move request to flush_queue */ 1936 switch (cqr->status) { 1937 case DASD_CQR_IN_IO: 1938 rc = device->discipline->term_IO(cqr); 1939 if (rc) { 1940 /* unable to terminate requeust */ 1941 dev_err(&device->cdev->dev, 1942 "Flushing the DASD request queue " 1943 "failed for request %p\n", cqr); 1944 /* stop flush processing */ 1945 goto finished; 1946 } 1947 break; 1948 case DASD_CQR_QUEUED: 1949 cqr->stopclk = get_clock(); 1950 cqr->status = DASD_CQR_CLEARED; 1951 break; 1952 default: /* no need to modify the others */ 1953 break; 1954 } 1955 list_move_tail(&cqr->devlist, &flush_queue); 1956 } 1957 finished: 1958 spin_unlock_irq(get_ccwdev_lock(device->cdev)); 1959 /* 1960 * After this point all requests must be in state CLEAR_PENDING, 1961 * CLEARED, SUCCESS or ERROR. Now wait for CLEAR_PENDING to become 1962 * one of the others. 1963 */ 1964 list_for_each_entry_safe(cqr, n, &flush_queue, devlist) 1965 wait_event(dasd_flush_wq, 1966 (cqr->status != DASD_CQR_CLEAR_PENDING)); 1967 /* 1968 * Now set each request back to TERMINATED, DONE or NEED_ERP 1969 * and call the callback function of flushed requests 1970 */ 1971 __dasd_device_process_final_queue(device, &flush_queue); 1972 return rc; 1973 } 1974 1975 /* 1976 * Acquire the device lock and process queues for the device. 1977 */ 1978 static void dasd_device_tasklet(struct dasd_device *device) 1979 { 1980 struct list_head final_queue; 1981 1982 atomic_set (&device->tasklet_scheduled, 0); 1983 INIT_LIST_HEAD(&final_queue); 1984 spin_lock_irq(get_ccwdev_lock(device->cdev)); 1985 /* Check expire time of first request on the ccw queue. */ 1986 __dasd_device_check_expire(device); 1987 /* find final requests on ccw queue */ 1988 __dasd_device_process_ccw_queue(device, &final_queue); 1989 __dasd_device_check_path_events(device); 1990 spin_unlock_irq(get_ccwdev_lock(device->cdev)); 1991 /* Now call the callback function of requests with final status */ 1992 __dasd_device_process_final_queue(device, &final_queue); 1993 spin_lock_irq(get_ccwdev_lock(device->cdev)); 1994 /* Now check if the head of the ccw queue needs to be started. */ 1995 __dasd_device_start_head(device); 1996 spin_unlock_irq(get_ccwdev_lock(device->cdev)); 1997 dasd_put_device(device); 1998 } 1999 2000 /* 2001 * Schedules a call to dasd_tasklet over the device tasklet. 2002 */ 2003 void dasd_schedule_device_bh(struct dasd_device *device) 2004 { 2005 /* Protect against rescheduling. */ 2006 if (atomic_cmpxchg (&device->tasklet_scheduled, 0, 1) != 0) 2007 return; 2008 dasd_get_device(device); 2009 tasklet_hi_schedule(&device->tasklet); 2010 } 2011 2012 void dasd_device_set_stop_bits(struct dasd_device *device, int bits) 2013 { 2014 device->stopped |= bits; 2015 } 2016 EXPORT_SYMBOL_GPL(dasd_device_set_stop_bits); 2017 2018 void dasd_device_remove_stop_bits(struct dasd_device *device, int bits) 2019 { 2020 device->stopped &= ~bits; 2021 if (!device->stopped) 2022 wake_up(&generic_waitq); 2023 } 2024 EXPORT_SYMBOL_GPL(dasd_device_remove_stop_bits); 2025 2026 /* 2027 * Queue a request to the head of the device ccw_queue. 2028 * Start the I/O if possible. 2029 */ 2030 void dasd_add_request_head(struct dasd_ccw_req *cqr) 2031 { 2032 struct dasd_device *device; 2033 unsigned long flags; 2034 2035 device = cqr->startdev; 2036 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 2037 cqr->status = DASD_CQR_QUEUED; 2038 list_add(&cqr->devlist, &device->ccw_queue); 2039 /* let the bh start the request to keep them in order */ 2040 dasd_schedule_device_bh(device); 2041 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 2042 } 2043 2044 /* 2045 * Queue a request to the tail of the device ccw_queue. 2046 * Start the I/O if possible. 2047 */ 2048 void dasd_add_request_tail(struct dasd_ccw_req *cqr) 2049 { 2050 struct dasd_device *device; 2051 unsigned long flags; 2052 2053 device = cqr->startdev; 2054 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 2055 cqr->status = DASD_CQR_QUEUED; 2056 list_add_tail(&cqr->devlist, &device->ccw_queue); 2057 /* let the bh start the request to keep them in order */ 2058 dasd_schedule_device_bh(device); 2059 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 2060 } 2061 2062 /* 2063 * Wakeup helper for the 'sleep_on' functions. 2064 */ 2065 void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data) 2066 { 2067 spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev)); 2068 cqr->callback_data = DASD_SLEEPON_END_TAG; 2069 spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev)); 2070 wake_up(&generic_waitq); 2071 } 2072 EXPORT_SYMBOL_GPL(dasd_wakeup_cb); 2073 2074 static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr) 2075 { 2076 struct dasd_device *device; 2077 int rc; 2078 2079 device = cqr->startdev; 2080 spin_lock_irq(get_ccwdev_lock(device->cdev)); 2081 rc = (cqr->callback_data == DASD_SLEEPON_END_TAG); 2082 spin_unlock_irq(get_ccwdev_lock(device->cdev)); 2083 return rc; 2084 } 2085 2086 /* 2087 * checks if error recovery is necessary, returns 1 if yes, 0 otherwise. 2088 */ 2089 static int __dasd_sleep_on_erp(struct dasd_ccw_req *cqr) 2090 { 2091 struct dasd_device *device; 2092 dasd_erp_fn_t erp_fn; 2093 2094 if (cqr->status == DASD_CQR_FILLED) 2095 return 0; 2096 device = cqr->startdev; 2097 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) { 2098 if (cqr->status == DASD_CQR_TERMINATED) { 2099 device->discipline->handle_terminated_request(cqr); 2100 return 1; 2101 } 2102 if (cqr->status == DASD_CQR_NEED_ERP) { 2103 erp_fn = device->discipline->erp_action(cqr); 2104 erp_fn(cqr); 2105 return 1; 2106 } 2107 if (cqr->status == DASD_CQR_FAILED) 2108 dasd_log_sense(cqr, &cqr->irb); 2109 if (cqr->refers) { 2110 __dasd_process_erp(device, cqr); 2111 return 1; 2112 } 2113 } 2114 return 0; 2115 } 2116 2117 static int __dasd_sleep_on_loop_condition(struct dasd_ccw_req *cqr) 2118 { 2119 if (test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) { 2120 if (cqr->refers) /* erp is not done yet */ 2121 return 1; 2122 return ((cqr->status != DASD_CQR_DONE) && 2123 (cqr->status != DASD_CQR_FAILED)); 2124 } else 2125 return (cqr->status == DASD_CQR_FILLED); 2126 } 2127 2128 static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible) 2129 { 2130 struct dasd_device *device; 2131 int rc; 2132 struct list_head ccw_queue; 2133 struct dasd_ccw_req *cqr; 2134 2135 INIT_LIST_HEAD(&ccw_queue); 2136 maincqr->status = DASD_CQR_FILLED; 2137 device = maincqr->startdev; 2138 list_add(&maincqr->blocklist, &ccw_queue); 2139 for (cqr = maincqr; __dasd_sleep_on_loop_condition(cqr); 2140 cqr = list_first_entry(&ccw_queue, 2141 struct dasd_ccw_req, blocklist)) { 2142 2143 if (__dasd_sleep_on_erp(cqr)) 2144 continue; 2145 if (cqr->status != DASD_CQR_FILLED) /* could be failed */ 2146 continue; 2147 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) && 2148 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { 2149 cqr->status = DASD_CQR_FAILED; 2150 cqr->intrc = -EPERM; 2151 continue; 2152 } 2153 /* Non-temporary stop condition will trigger fail fast */ 2154 if (device->stopped & ~DASD_STOPPED_PENDING && 2155 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && 2156 (!dasd_eer_enabled(device))) { 2157 cqr->status = DASD_CQR_FAILED; 2158 continue; 2159 } 2160 /* Don't try to start requests if device is stopped */ 2161 if (interruptible) { 2162 rc = wait_event_interruptible( 2163 generic_waitq, !(device->stopped)); 2164 if (rc == -ERESTARTSYS) { 2165 cqr->status = DASD_CQR_FAILED; 2166 maincqr->intrc = rc; 2167 continue; 2168 } 2169 } else 2170 wait_event(generic_waitq, !(device->stopped)); 2171 2172 if (!cqr->callback) 2173 cqr->callback = dasd_wakeup_cb; 2174 2175 cqr->callback_data = DASD_SLEEPON_START_TAG; 2176 dasd_add_request_tail(cqr); 2177 if (interruptible) { 2178 rc = wait_event_interruptible( 2179 generic_waitq, _wait_for_wakeup(cqr)); 2180 if (rc == -ERESTARTSYS) { 2181 dasd_cancel_req(cqr); 2182 /* wait (non-interruptible) for final status */ 2183 wait_event(generic_waitq, 2184 _wait_for_wakeup(cqr)); 2185 cqr->status = DASD_CQR_FAILED; 2186 maincqr->intrc = rc; 2187 continue; 2188 } 2189 } else 2190 wait_event(generic_waitq, _wait_for_wakeup(cqr)); 2191 } 2192 2193 maincqr->endclk = get_clock(); 2194 if ((maincqr->status != DASD_CQR_DONE) && 2195 (maincqr->intrc != -ERESTARTSYS)) 2196 dasd_log_sense(maincqr, &maincqr->irb); 2197 if (maincqr->status == DASD_CQR_DONE) 2198 rc = 0; 2199 else if (maincqr->intrc) 2200 rc = maincqr->intrc; 2201 else 2202 rc = -EIO; 2203 return rc; 2204 } 2205 2206 /* 2207 * Queue a request to the tail of the device ccw_queue and wait for 2208 * it's completion. 2209 */ 2210 int dasd_sleep_on(struct dasd_ccw_req *cqr) 2211 { 2212 return _dasd_sleep_on(cqr, 0); 2213 } 2214 2215 /* 2216 * Queue a request to the tail of the device ccw_queue and wait 2217 * interruptible for it's completion. 2218 */ 2219 int dasd_sleep_on_interruptible(struct dasd_ccw_req *cqr) 2220 { 2221 return _dasd_sleep_on(cqr, 1); 2222 } 2223 2224 /* 2225 * Whoa nelly now it gets really hairy. For some functions (e.g. steal lock 2226 * for eckd devices) the currently running request has to be terminated 2227 * and be put back to status queued, before the special request is added 2228 * to the head of the queue. Then the special request is waited on normally. 2229 */ 2230 static inline int _dasd_term_running_cqr(struct dasd_device *device) 2231 { 2232 struct dasd_ccw_req *cqr; 2233 int rc; 2234 2235 if (list_empty(&device->ccw_queue)) 2236 return 0; 2237 cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist); 2238 rc = device->discipline->term_IO(cqr); 2239 if (!rc) 2240 /* 2241 * CQR terminated because a more important request is pending. 2242 * Undo decreasing of retry counter because this is 2243 * not an error case. 2244 */ 2245 cqr->retries++; 2246 return rc; 2247 } 2248 2249 int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr) 2250 { 2251 struct dasd_device *device; 2252 int rc; 2253 2254 device = cqr->startdev; 2255 if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags) && 2256 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { 2257 cqr->status = DASD_CQR_FAILED; 2258 cqr->intrc = -EPERM; 2259 return -EIO; 2260 } 2261 spin_lock_irq(get_ccwdev_lock(device->cdev)); 2262 rc = _dasd_term_running_cqr(device); 2263 if (rc) { 2264 spin_unlock_irq(get_ccwdev_lock(device->cdev)); 2265 return rc; 2266 } 2267 cqr->callback = dasd_wakeup_cb; 2268 cqr->callback_data = DASD_SLEEPON_START_TAG; 2269 cqr->status = DASD_CQR_QUEUED; 2270 /* 2271 * add new request as second 2272 * first the terminated cqr needs to be finished 2273 */ 2274 list_add(&cqr->devlist, device->ccw_queue.next); 2275 2276 /* let the bh start the request to keep them in order */ 2277 dasd_schedule_device_bh(device); 2278 2279 spin_unlock_irq(get_ccwdev_lock(device->cdev)); 2280 2281 wait_event(generic_waitq, _wait_for_wakeup(cqr)); 2282 2283 if (cqr->status == DASD_CQR_DONE) 2284 rc = 0; 2285 else if (cqr->intrc) 2286 rc = cqr->intrc; 2287 else 2288 rc = -EIO; 2289 return rc; 2290 } 2291 2292 /* 2293 * Cancels a request that was started with dasd_sleep_on_req. 2294 * This is useful to timeout requests. The request will be 2295 * terminated if it is currently in i/o. 2296 * Returns 1 if the request has been terminated. 2297 * 0 if there was no need to terminate the request (not started yet) 2298 * negative error code if termination failed 2299 * Cancellation of a request is an asynchronous operation! The calling 2300 * function has to wait until the request is properly returned via callback. 2301 */ 2302 int dasd_cancel_req(struct dasd_ccw_req *cqr) 2303 { 2304 struct dasd_device *device = cqr->startdev; 2305 unsigned long flags; 2306 int rc; 2307 2308 rc = 0; 2309 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 2310 switch (cqr->status) { 2311 case DASD_CQR_QUEUED: 2312 /* request was not started - just set to cleared */ 2313 cqr->status = DASD_CQR_CLEARED; 2314 break; 2315 case DASD_CQR_IN_IO: 2316 /* request in IO - terminate IO and release again */ 2317 rc = device->discipline->term_IO(cqr); 2318 if (rc) { 2319 dev_err(&device->cdev->dev, 2320 "Cancelling request %p failed with rc=%d\n", 2321 cqr, rc); 2322 } else { 2323 cqr->stopclk = get_clock(); 2324 } 2325 break; 2326 default: /* already finished or clear pending - do nothing */ 2327 break; 2328 } 2329 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 2330 dasd_schedule_device_bh(device); 2331 return rc; 2332 } 2333 2334 2335 /* 2336 * SECTION: Operations of the dasd_block layer. 2337 */ 2338 2339 /* 2340 * Timeout function for dasd_block. This is used when the block layer 2341 * is waiting for something that may not come reliably, (e.g. a state 2342 * change interrupt) 2343 */ 2344 static void dasd_block_timeout(unsigned long ptr) 2345 { 2346 unsigned long flags; 2347 struct dasd_block *block; 2348 2349 block = (struct dasd_block *) ptr; 2350 spin_lock_irqsave(get_ccwdev_lock(block->base->cdev), flags); 2351 /* re-activate request queue */ 2352 dasd_device_remove_stop_bits(block->base, DASD_STOPPED_PENDING); 2353 spin_unlock_irqrestore(get_ccwdev_lock(block->base->cdev), flags); 2354 dasd_schedule_block_bh(block); 2355 } 2356 2357 /* 2358 * Setup timeout for a dasd_block in jiffies. 2359 */ 2360 void dasd_block_set_timer(struct dasd_block *block, int expires) 2361 { 2362 if (expires == 0) 2363 del_timer(&block->timer); 2364 else 2365 mod_timer(&block->timer, jiffies + expires); 2366 } 2367 2368 /* 2369 * Clear timeout for a dasd_block. 2370 */ 2371 void dasd_block_clear_timer(struct dasd_block *block) 2372 { 2373 del_timer(&block->timer); 2374 } 2375 2376 /* 2377 * Process finished error recovery ccw. 2378 */ 2379 static void __dasd_process_erp(struct dasd_device *device, 2380 struct dasd_ccw_req *cqr) 2381 { 2382 dasd_erp_fn_t erp_fn; 2383 2384 if (cqr->status == DASD_CQR_DONE) 2385 DBF_DEV_EVENT(DBF_NOTICE, device, "%s", "ERP successful"); 2386 else 2387 dev_err(&device->cdev->dev, "ERP failed for the DASD\n"); 2388 erp_fn = device->discipline->erp_postaction(cqr); 2389 erp_fn(cqr); 2390 } 2391 2392 /* 2393 * Fetch requests from the block device queue. 2394 */ 2395 static void __dasd_process_request_queue(struct dasd_block *block) 2396 { 2397 struct request_queue *queue; 2398 struct request *req; 2399 struct dasd_ccw_req *cqr; 2400 struct dasd_device *basedev; 2401 unsigned long flags; 2402 queue = block->request_queue; 2403 basedev = block->base; 2404 /* No queue ? Then there is nothing to do. */ 2405 if (queue == NULL) 2406 return; 2407 2408 /* 2409 * We requeue request from the block device queue to the ccw 2410 * queue only in two states. In state DASD_STATE_READY the 2411 * partition detection is done and we need to requeue requests 2412 * for that. State DASD_STATE_ONLINE is normal block device 2413 * operation. 2414 */ 2415 if (basedev->state < DASD_STATE_READY) { 2416 while ((req = blk_fetch_request(block->request_queue))) 2417 __blk_end_request_all(req, -EIO); 2418 return; 2419 } 2420 /* Now we try to fetch requests from the request queue */ 2421 while ((req = blk_peek_request(queue))) { 2422 if (basedev->features & DASD_FEATURE_READONLY && 2423 rq_data_dir(req) == WRITE) { 2424 DBF_DEV_EVENT(DBF_ERR, basedev, 2425 "Rejecting write request %p", 2426 req); 2427 blk_start_request(req); 2428 __blk_end_request_all(req, -EIO); 2429 continue; 2430 } 2431 cqr = basedev->discipline->build_cp(basedev, block, req); 2432 if (IS_ERR(cqr)) { 2433 if (PTR_ERR(cqr) == -EBUSY) 2434 break; /* normal end condition */ 2435 if (PTR_ERR(cqr) == -ENOMEM) 2436 break; /* terminate request queue loop */ 2437 if (PTR_ERR(cqr) == -EAGAIN) { 2438 /* 2439 * The current request cannot be build right 2440 * now, we have to try later. If this request 2441 * is the head-of-queue we stop the device 2442 * for 1/2 second. 2443 */ 2444 if (!list_empty(&block->ccw_queue)) 2445 break; 2446 spin_lock_irqsave( 2447 get_ccwdev_lock(basedev->cdev), flags); 2448 dasd_device_set_stop_bits(basedev, 2449 DASD_STOPPED_PENDING); 2450 spin_unlock_irqrestore( 2451 get_ccwdev_lock(basedev->cdev), flags); 2452 dasd_block_set_timer(block, HZ/2); 2453 break; 2454 } 2455 DBF_DEV_EVENT(DBF_ERR, basedev, 2456 "CCW creation failed (rc=%ld) " 2457 "on request %p", 2458 PTR_ERR(cqr), req); 2459 blk_start_request(req); 2460 __blk_end_request_all(req, -EIO); 2461 continue; 2462 } 2463 /* 2464 * Note: callback is set to dasd_return_cqr_cb in 2465 * __dasd_block_start_head to cover erp requests as well 2466 */ 2467 cqr->callback_data = (void *) req; 2468 cqr->status = DASD_CQR_FILLED; 2469 blk_start_request(req); 2470 list_add_tail(&cqr->blocklist, &block->ccw_queue); 2471 dasd_profile_start(block, cqr, req); 2472 } 2473 } 2474 2475 static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr) 2476 { 2477 struct request *req; 2478 int status; 2479 int error = 0; 2480 2481 req = (struct request *) cqr->callback_data; 2482 dasd_profile_end(cqr->block, cqr, req); 2483 status = cqr->block->base->discipline->free_cp(cqr, req); 2484 if (status <= 0) 2485 error = status ? status : -EIO; 2486 __blk_end_request_all(req, error); 2487 } 2488 2489 /* 2490 * Process ccw request queue. 2491 */ 2492 static void __dasd_process_block_ccw_queue(struct dasd_block *block, 2493 struct list_head *final_queue) 2494 { 2495 struct list_head *l, *n; 2496 struct dasd_ccw_req *cqr; 2497 dasd_erp_fn_t erp_fn; 2498 unsigned long flags; 2499 struct dasd_device *base = block->base; 2500 2501 restart: 2502 /* Process request with final status. */ 2503 list_for_each_safe(l, n, &block->ccw_queue) { 2504 cqr = list_entry(l, struct dasd_ccw_req, blocklist); 2505 if (cqr->status != DASD_CQR_DONE && 2506 cqr->status != DASD_CQR_FAILED && 2507 cqr->status != DASD_CQR_NEED_ERP && 2508 cqr->status != DASD_CQR_TERMINATED) 2509 continue; 2510 2511 if (cqr->status == DASD_CQR_TERMINATED) { 2512 base->discipline->handle_terminated_request(cqr); 2513 goto restart; 2514 } 2515 2516 /* Process requests that may be recovered */ 2517 if (cqr->status == DASD_CQR_NEED_ERP) { 2518 erp_fn = base->discipline->erp_action(cqr); 2519 if (IS_ERR(erp_fn(cqr))) 2520 continue; 2521 goto restart; 2522 } 2523 2524 /* log sense for fatal error */ 2525 if (cqr->status == DASD_CQR_FAILED) { 2526 dasd_log_sense(cqr, &cqr->irb); 2527 } 2528 2529 /* First of all call extended error reporting. */ 2530 if (dasd_eer_enabled(base) && 2531 cqr->status == DASD_CQR_FAILED) { 2532 dasd_eer_write(base, cqr, DASD_EER_FATALERROR); 2533 2534 /* restart request */ 2535 cqr->status = DASD_CQR_FILLED; 2536 cqr->retries = 255; 2537 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); 2538 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE); 2539 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), 2540 flags); 2541 goto restart; 2542 } 2543 2544 /* Process finished ERP request. */ 2545 if (cqr->refers) { 2546 __dasd_process_erp(base, cqr); 2547 goto restart; 2548 } 2549 2550 /* Rechain finished requests to final queue */ 2551 cqr->endclk = get_clock(); 2552 list_move_tail(&cqr->blocklist, final_queue); 2553 } 2554 } 2555 2556 static void dasd_return_cqr_cb(struct dasd_ccw_req *cqr, void *data) 2557 { 2558 dasd_schedule_block_bh(cqr->block); 2559 } 2560 2561 static void __dasd_block_start_head(struct dasd_block *block) 2562 { 2563 struct dasd_ccw_req *cqr; 2564 2565 if (list_empty(&block->ccw_queue)) 2566 return; 2567 /* We allways begin with the first requests on the queue, as some 2568 * of previously started requests have to be enqueued on a 2569 * dasd_device again for error recovery. 2570 */ 2571 list_for_each_entry(cqr, &block->ccw_queue, blocklist) { 2572 if (cqr->status != DASD_CQR_FILLED) 2573 continue; 2574 if (test_bit(DASD_FLAG_LOCK_STOLEN, &block->base->flags) && 2575 !test_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags)) { 2576 cqr->status = DASD_CQR_FAILED; 2577 cqr->intrc = -EPERM; 2578 dasd_schedule_block_bh(block); 2579 continue; 2580 } 2581 /* Non-temporary stop condition will trigger fail fast */ 2582 if (block->base->stopped & ~DASD_STOPPED_PENDING && 2583 test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && 2584 (!dasd_eer_enabled(block->base))) { 2585 cqr->status = DASD_CQR_FAILED; 2586 dasd_schedule_block_bh(block); 2587 continue; 2588 } 2589 /* Don't try to start requests if device is stopped */ 2590 if (block->base->stopped) 2591 return; 2592 2593 /* just a fail safe check, should not happen */ 2594 if (!cqr->startdev) 2595 cqr->startdev = block->base; 2596 2597 /* make sure that the requests we submit find their way back */ 2598 cqr->callback = dasd_return_cqr_cb; 2599 2600 dasd_add_request_tail(cqr); 2601 } 2602 } 2603 2604 /* 2605 * Central dasd_block layer routine. Takes requests from the generic 2606 * block layer request queue, creates ccw requests, enqueues them on 2607 * a dasd_device and processes ccw requests that have been returned. 2608 */ 2609 static void dasd_block_tasklet(struct dasd_block *block) 2610 { 2611 struct list_head final_queue; 2612 struct list_head *l, *n; 2613 struct dasd_ccw_req *cqr; 2614 2615 atomic_set(&block->tasklet_scheduled, 0); 2616 INIT_LIST_HEAD(&final_queue); 2617 spin_lock(&block->queue_lock); 2618 /* Finish off requests on ccw queue */ 2619 __dasd_process_block_ccw_queue(block, &final_queue); 2620 spin_unlock(&block->queue_lock); 2621 /* Now call the callback function of requests with final status */ 2622 spin_lock_irq(&block->request_queue_lock); 2623 list_for_each_safe(l, n, &final_queue) { 2624 cqr = list_entry(l, struct dasd_ccw_req, blocklist); 2625 list_del_init(&cqr->blocklist); 2626 __dasd_cleanup_cqr(cqr); 2627 } 2628 spin_lock(&block->queue_lock); 2629 /* Get new request from the block device request queue */ 2630 __dasd_process_request_queue(block); 2631 /* Now check if the head of the ccw queue needs to be started. */ 2632 __dasd_block_start_head(block); 2633 spin_unlock(&block->queue_lock); 2634 spin_unlock_irq(&block->request_queue_lock); 2635 dasd_put_device(block->base); 2636 } 2637 2638 static void _dasd_wake_block_flush_cb(struct dasd_ccw_req *cqr, void *data) 2639 { 2640 wake_up(&dasd_flush_wq); 2641 } 2642 2643 /* 2644 * Go through all request on the dasd_block request queue, cancel them 2645 * on the respective dasd_device, and return them to the generic 2646 * block layer. 2647 */ 2648 static int dasd_flush_block_queue(struct dasd_block *block) 2649 { 2650 struct dasd_ccw_req *cqr, *n; 2651 int rc, i; 2652 struct list_head flush_queue; 2653 2654 INIT_LIST_HEAD(&flush_queue); 2655 spin_lock_bh(&block->queue_lock); 2656 rc = 0; 2657 restart: 2658 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) { 2659 /* if this request currently owned by a dasd_device cancel it */ 2660 if (cqr->status >= DASD_CQR_QUEUED) 2661 rc = dasd_cancel_req(cqr); 2662 if (rc < 0) 2663 break; 2664 /* Rechain request (including erp chain) so it won't be 2665 * touched by the dasd_block_tasklet anymore. 2666 * Replace the callback so we notice when the request 2667 * is returned from the dasd_device layer. 2668 */ 2669 cqr->callback = _dasd_wake_block_flush_cb; 2670 for (i = 0; cqr != NULL; cqr = cqr->refers, i++) 2671 list_move_tail(&cqr->blocklist, &flush_queue); 2672 if (i > 1) 2673 /* moved more than one request - need to restart */ 2674 goto restart; 2675 } 2676 spin_unlock_bh(&block->queue_lock); 2677 /* Now call the callback function of flushed requests */ 2678 restart_cb: 2679 list_for_each_entry_safe(cqr, n, &flush_queue, blocklist) { 2680 wait_event(dasd_flush_wq, (cqr->status < DASD_CQR_QUEUED)); 2681 /* Process finished ERP request. */ 2682 if (cqr->refers) { 2683 spin_lock_bh(&block->queue_lock); 2684 __dasd_process_erp(block->base, cqr); 2685 spin_unlock_bh(&block->queue_lock); 2686 /* restart list_for_xx loop since dasd_process_erp 2687 * might remove multiple elements */ 2688 goto restart_cb; 2689 } 2690 /* call the callback function */ 2691 spin_lock_irq(&block->request_queue_lock); 2692 cqr->endclk = get_clock(); 2693 list_del_init(&cqr->blocklist); 2694 __dasd_cleanup_cqr(cqr); 2695 spin_unlock_irq(&block->request_queue_lock); 2696 } 2697 return rc; 2698 } 2699 2700 /* 2701 * Schedules a call to dasd_tasklet over the device tasklet. 2702 */ 2703 void dasd_schedule_block_bh(struct dasd_block *block) 2704 { 2705 /* Protect against rescheduling. */ 2706 if (atomic_cmpxchg(&block->tasklet_scheduled, 0, 1) != 0) 2707 return; 2708 /* life cycle of block is bound to it's base device */ 2709 dasd_get_device(block->base); 2710 tasklet_hi_schedule(&block->tasklet); 2711 } 2712 2713 2714 /* 2715 * SECTION: external block device operations 2716 * (request queue handling, open, release, etc.) 2717 */ 2718 2719 /* 2720 * Dasd request queue function. Called from ll_rw_blk.c 2721 */ 2722 static void do_dasd_request(struct request_queue *queue) 2723 { 2724 struct dasd_block *block; 2725 2726 block = queue->queuedata; 2727 spin_lock(&block->queue_lock); 2728 /* Get new request from the block device request queue */ 2729 __dasd_process_request_queue(block); 2730 /* Now check if the head of the ccw queue needs to be started. */ 2731 __dasd_block_start_head(block); 2732 spin_unlock(&block->queue_lock); 2733 } 2734 2735 /* 2736 * Allocate and initialize request queue and default I/O scheduler. 2737 */ 2738 static int dasd_alloc_queue(struct dasd_block *block) 2739 { 2740 int rc; 2741 2742 block->request_queue = blk_init_queue(do_dasd_request, 2743 &block->request_queue_lock); 2744 if (block->request_queue == NULL) 2745 return -ENOMEM; 2746 2747 block->request_queue->queuedata = block; 2748 2749 elevator_exit(block->request_queue->elevator); 2750 block->request_queue->elevator = NULL; 2751 rc = elevator_init(block->request_queue, "deadline"); 2752 if (rc) { 2753 blk_cleanup_queue(block->request_queue); 2754 return rc; 2755 } 2756 return 0; 2757 } 2758 2759 /* 2760 * Allocate and initialize request queue. 2761 */ 2762 static void dasd_setup_queue(struct dasd_block *block) 2763 { 2764 int max; 2765 2766 if (block->base->features & DASD_FEATURE_USERAW) { 2767 /* 2768 * the max_blocks value for raw_track access is 256 2769 * it is higher than the native ECKD value because we 2770 * only need one ccw per track 2771 * so the max_hw_sectors are 2772 * 2048 x 512B = 1024kB = 16 tracks 2773 */ 2774 max = 2048; 2775 } else { 2776 max = block->base->discipline->max_blocks << block->s2b_shift; 2777 } 2778 blk_queue_logical_block_size(block->request_queue, 2779 block->bp_block); 2780 blk_queue_max_hw_sectors(block->request_queue, max); 2781 blk_queue_max_segments(block->request_queue, -1L); 2782 /* with page sized segments we can translate each segement into 2783 * one idaw/tidaw 2784 */ 2785 blk_queue_max_segment_size(block->request_queue, PAGE_SIZE); 2786 blk_queue_segment_boundary(block->request_queue, PAGE_SIZE - 1); 2787 } 2788 2789 /* 2790 * Deactivate and free request queue. 2791 */ 2792 static void dasd_free_queue(struct dasd_block *block) 2793 { 2794 if (block->request_queue) { 2795 blk_cleanup_queue(block->request_queue); 2796 block->request_queue = NULL; 2797 } 2798 } 2799 2800 /* 2801 * Flush request on the request queue. 2802 */ 2803 static void dasd_flush_request_queue(struct dasd_block *block) 2804 { 2805 struct request *req; 2806 2807 if (!block->request_queue) 2808 return; 2809 2810 spin_lock_irq(&block->request_queue_lock); 2811 while ((req = blk_fetch_request(block->request_queue))) 2812 __blk_end_request_all(req, -EIO); 2813 spin_unlock_irq(&block->request_queue_lock); 2814 } 2815 2816 static int dasd_open(struct block_device *bdev, fmode_t mode) 2817 { 2818 struct dasd_device *base; 2819 int rc; 2820 2821 base = dasd_device_from_gendisk(bdev->bd_disk); 2822 if (!base) 2823 return -ENODEV; 2824 2825 atomic_inc(&base->block->open_count); 2826 if (test_bit(DASD_FLAG_OFFLINE, &base->flags)) { 2827 rc = -ENODEV; 2828 goto unlock; 2829 } 2830 2831 if (!try_module_get(base->discipline->owner)) { 2832 rc = -EINVAL; 2833 goto unlock; 2834 } 2835 2836 if (dasd_probeonly) { 2837 dev_info(&base->cdev->dev, 2838 "Accessing the DASD failed because it is in " 2839 "probeonly mode\n"); 2840 rc = -EPERM; 2841 goto out; 2842 } 2843 2844 if (base->state <= DASD_STATE_BASIC) { 2845 DBF_DEV_EVENT(DBF_ERR, base, " %s", 2846 " Cannot open unrecognized device"); 2847 rc = -ENODEV; 2848 goto out; 2849 } 2850 2851 if ((mode & FMODE_WRITE) && 2852 (test_bit(DASD_FLAG_DEVICE_RO, &base->flags) || 2853 (base->features & DASD_FEATURE_READONLY))) { 2854 rc = -EROFS; 2855 goto out; 2856 } 2857 2858 dasd_put_device(base); 2859 return 0; 2860 2861 out: 2862 module_put(base->discipline->owner); 2863 unlock: 2864 atomic_dec(&base->block->open_count); 2865 dasd_put_device(base); 2866 return rc; 2867 } 2868 2869 static int dasd_release(struct gendisk *disk, fmode_t mode) 2870 { 2871 struct dasd_device *base; 2872 2873 base = dasd_device_from_gendisk(disk); 2874 if (!base) 2875 return -ENODEV; 2876 2877 atomic_dec(&base->block->open_count); 2878 module_put(base->discipline->owner); 2879 dasd_put_device(base); 2880 return 0; 2881 } 2882 2883 /* 2884 * Return disk geometry. 2885 */ 2886 static int dasd_getgeo(struct block_device *bdev, struct hd_geometry *geo) 2887 { 2888 struct dasd_device *base; 2889 2890 base = dasd_device_from_gendisk(bdev->bd_disk); 2891 if (!base) 2892 return -ENODEV; 2893 2894 if (!base->discipline || 2895 !base->discipline->fill_geometry) { 2896 dasd_put_device(base); 2897 return -EINVAL; 2898 } 2899 base->discipline->fill_geometry(base->block, geo); 2900 geo->start = get_start_sect(bdev) >> base->block->s2b_shift; 2901 dasd_put_device(base); 2902 return 0; 2903 } 2904 2905 const struct block_device_operations 2906 dasd_device_operations = { 2907 .owner = THIS_MODULE, 2908 .open = dasd_open, 2909 .release = dasd_release, 2910 .ioctl = dasd_ioctl, 2911 .compat_ioctl = dasd_ioctl, 2912 .getgeo = dasd_getgeo, 2913 }; 2914 2915 /******************************************************************************* 2916 * end of block device operations 2917 */ 2918 2919 static void 2920 dasd_exit(void) 2921 { 2922 #ifdef CONFIG_PROC_FS 2923 dasd_proc_exit(); 2924 #endif 2925 dasd_eer_exit(); 2926 if (dasd_page_cache != NULL) { 2927 kmem_cache_destroy(dasd_page_cache); 2928 dasd_page_cache = NULL; 2929 } 2930 dasd_gendisk_exit(); 2931 dasd_devmap_exit(); 2932 if (dasd_debug_area != NULL) { 2933 debug_unregister(dasd_debug_area); 2934 dasd_debug_area = NULL; 2935 } 2936 dasd_statistics_removeroot(); 2937 } 2938 2939 /* 2940 * SECTION: common functions for ccw_driver use 2941 */ 2942 2943 /* 2944 * Is the device read-only? 2945 * Note that this function does not report the setting of the 2946 * readonly device attribute, but how it is configured in z/VM. 2947 */ 2948 int dasd_device_is_ro(struct dasd_device *device) 2949 { 2950 struct ccw_dev_id dev_id; 2951 struct diag210 diag_data; 2952 int rc; 2953 2954 if (!MACHINE_IS_VM) 2955 return 0; 2956 ccw_device_get_id(device->cdev, &dev_id); 2957 memset(&diag_data, 0, sizeof(diag_data)); 2958 diag_data.vrdcdvno = dev_id.devno; 2959 diag_data.vrdclen = sizeof(diag_data); 2960 rc = diag210(&diag_data); 2961 if (rc == 0 || rc == 2) { 2962 return diag_data.vrdcvfla & 0x80; 2963 } else { 2964 DBF_EVENT(DBF_WARNING, "diag210 failed for dev=%04x with rc=%d", 2965 dev_id.devno, rc); 2966 return 0; 2967 } 2968 } 2969 EXPORT_SYMBOL_GPL(dasd_device_is_ro); 2970 2971 static void dasd_generic_auto_online(void *data, async_cookie_t cookie) 2972 { 2973 struct ccw_device *cdev = data; 2974 int ret; 2975 2976 ret = ccw_device_set_online(cdev); 2977 if (ret) 2978 pr_warning("%s: Setting the DASD online failed with rc=%d\n", 2979 dev_name(&cdev->dev), ret); 2980 } 2981 2982 /* 2983 * Initial attempt at a probe function. this can be simplified once 2984 * the other detection code is gone. 2985 */ 2986 int dasd_generic_probe(struct ccw_device *cdev, 2987 struct dasd_discipline *discipline) 2988 { 2989 int ret; 2990 2991 ret = dasd_add_sysfs_files(cdev); 2992 if (ret) { 2993 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", 2994 "dasd_generic_probe: could not add " 2995 "sysfs entries"); 2996 return ret; 2997 } 2998 cdev->handler = &dasd_int_handler; 2999 3000 /* 3001 * Automatically online either all dasd devices (dasd_autodetect) 3002 * or all devices specified with dasd= parameters during 3003 * initial probe. 3004 */ 3005 if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) || 3006 (dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0)) 3007 async_schedule(dasd_generic_auto_online, cdev); 3008 return 0; 3009 } 3010 3011 /* 3012 * This will one day be called from a global not_oper handler. 3013 * It is also used by driver_unregister during module unload. 3014 */ 3015 void dasd_generic_remove(struct ccw_device *cdev) 3016 { 3017 struct dasd_device *device; 3018 struct dasd_block *block; 3019 3020 cdev->handler = NULL; 3021 3022 dasd_remove_sysfs_files(cdev); 3023 device = dasd_device_from_cdev(cdev); 3024 if (IS_ERR(device)) 3025 return; 3026 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { 3027 /* Already doing offline processing */ 3028 dasd_put_device(device); 3029 return; 3030 } 3031 /* 3032 * This device is removed unconditionally. Set offline 3033 * flag to prevent dasd_open from opening it while it is 3034 * no quite down yet. 3035 */ 3036 dasd_set_target_state(device, DASD_STATE_NEW); 3037 /* dasd_delete_device destroys the device reference. */ 3038 block = device->block; 3039 dasd_delete_device(device); 3040 /* 3041 * life cycle of block is bound to device, so delete it after 3042 * device was safely removed 3043 */ 3044 if (block) 3045 dasd_free_block(block); 3046 } 3047 3048 /* 3049 * Activate a device. This is called from dasd_{eckd,fba}_probe() when either 3050 * the device is detected for the first time and is supposed to be used 3051 * or the user has started activation through sysfs. 3052 */ 3053 int dasd_generic_set_online(struct ccw_device *cdev, 3054 struct dasd_discipline *base_discipline) 3055 { 3056 struct dasd_discipline *discipline; 3057 struct dasd_device *device; 3058 int rc; 3059 3060 /* first online clears initial online feature flag */ 3061 dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0); 3062 device = dasd_create_device(cdev); 3063 if (IS_ERR(device)) 3064 return PTR_ERR(device); 3065 3066 discipline = base_discipline; 3067 if (device->features & DASD_FEATURE_USEDIAG) { 3068 if (!dasd_diag_discipline_pointer) { 3069 pr_warning("%s Setting the DASD online failed because " 3070 "of missing DIAG discipline\n", 3071 dev_name(&cdev->dev)); 3072 dasd_delete_device(device); 3073 return -ENODEV; 3074 } 3075 discipline = dasd_diag_discipline_pointer; 3076 } 3077 if (!try_module_get(base_discipline->owner)) { 3078 dasd_delete_device(device); 3079 return -EINVAL; 3080 } 3081 if (!try_module_get(discipline->owner)) { 3082 module_put(base_discipline->owner); 3083 dasd_delete_device(device); 3084 return -EINVAL; 3085 } 3086 device->base_discipline = base_discipline; 3087 device->discipline = discipline; 3088 3089 /* check_device will allocate block device if necessary */ 3090 rc = discipline->check_device(device); 3091 if (rc) { 3092 pr_warning("%s Setting the DASD online with discipline %s " 3093 "failed with rc=%i\n", 3094 dev_name(&cdev->dev), discipline->name, rc); 3095 module_put(discipline->owner); 3096 module_put(base_discipline->owner); 3097 dasd_delete_device(device); 3098 return rc; 3099 } 3100 3101 dasd_set_target_state(device, DASD_STATE_ONLINE); 3102 if (device->state <= DASD_STATE_KNOWN) { 3103 pr_warning("%s Setting the DASD online failed because of a " 3104 "missing discipline\n", dev_name(&cdev->dev)); 3105 rc = -ENODEV; 3106 dasd_set_target_state(device, DASD_STATE_NEW); 3107 if (device->block) 3108 dasd_free_block(device->block); 3109 dasd_delete_device(device); 3110 } else 3111 pr_debug("dasd_generic device %s found\n", 3112 dev_name(&cdev->dev)); 3113 3114 wait_event(dasd_init_waitq, _wait_for_device(device)); 3115 3116 dasd_put_device(device); 3117 return rc; 3118 } 3119 3120 int dasd_generic_set_offline(struct ccw_device *cdev) 3121 { 3122 struct dasd_device *device; 3123 struct dasd_block *block; 3124 int max_count, open_count; 3125 3126 device = dasd_device_from_cdev(cdev); 3127 if (IS_ERR(device)) 3128 return PTR_ERR(device); 3129 if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags)) { 3130 /* Already doing offline processing */ 3131 dasd_put_device(device); 3132 return 0; 3133 } 3134 /* 3135 * We must make sure that this device is currently not in use. 3136 * The open_count is increased for every opener, that includes 3137 * the blkdev_get in dasd_scan_partitions. We are only interested 3138 * in the other openers. 3139 */ 3140 if (device->block) { 3141 max_count = device->block->bdev ? 0 : -1; 3142 open_count = atomic_read(&device->block->open_count); 3143 if (open_count > max_count) { 3144 if (open_count > 0) 3145 pr_warning("%s: The DASD cannot be set offline " 3146 "with open count %i\n", 3147 dev_name(&cdev->dev), open_count); 3148 else 3149 pr_warning("%s: The DASD cannot be set offline " 3150 "while it is in use\n", 3151 dev_name(&cdev->dev)); 3152 clear_bit(DASD_FLAG_OFFLINE, &device->flags); 3153 dasd_put_device(device); 3154 return -EBUSY; 3155 } 3156 } 3157 dasd_set_target_state(device, DASD_STATE_NEW); 3158 /* dasd_delete_device destroys the device reference. */ 3159 block = device->block; 3160 dasd_delete_device(device); 3161 /* 3162 * life cycle of block is bound to device, so delete it after 3163 * device was safely removed 3164 */ 3165 if (block) 3166 dasd_free_block(block); 3167 return 0; 3168 } 3169 3170 int dasd_generic_last_path_gone(struct dasd_device *device) 3171 { 3172 struct dasd_ccw_req *cqr; 3173 3174 dev_warn(&device->cdev->dev, "No operational channel path is left " 3175 "for the device\n"); 3176 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone"); 3177 /* First of all call extended error reporting. */ 3178 dasd_eer_write(device, NULL, DASD_EER_NOPATH); 3179 3180 if (device->state < DASD_STATE_BASIC) 3181 return 0; 3182 /* Device is active. We want to keep it. */ 3183 list_for_each_entry(cqr, &device->ccw_queue, devlist) 3184 if ((cqr->status == DASD_CQR_IN_IO) || 3185 (cqr->status == DASD_CQR_CLEAR_PENDING)) { 3186 cqr->status = DASD_CQR_QUEUED; 3187 cqr->retries++; 3188 } 3189 dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT); 3190 dasd_device_clear_timer(device); 3191 dasd_schedule_device_bh(device); 3192 return 1; 3193 } 3194 EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone); 3195 3196 int dasd_generic_path_operational(struct dasd_device *device) 3197 { 3198 dev_info(&device->cdev->dev, "A channel path to the device has become " 3199 "operational\n"); 3200 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational"); 3201 dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT); 3202 if (device->stopped & DASD_UNRESUMED_PM) { 3203 dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM); 3204 dasd_restore_device(device); 3205 return 1; 3206 } 3207 dasd_schedule_device_bh(device); 3208 if (device->block) 3209 dasd_schedule_block_bh(device->block); 3210 return 1; 3211 } 3212 EXPORT_SYMBOL_GPL(dasd_generic_path_operational); 3213 3214 int dasd_generic_notify(struct ccw_device *cdev, int event) 3215 { 3216 struct dasd_device *device; 3217 int ret; 3218 3219 device = dasd_device_from_cdev_locked(cdev); 3220 if (IS_ERR(device)) 3221 return 0; 3222 ret = 0; 3223 switch (event) { 3224 case CIO_GONE: 3225 case CIO_BOXED: 3226 case CIO_NO_PATH: 3227 device->path_data.opm = 0; 3228 device->path_data.ppm = 0; 3229 device->path_data.npm = 0; 3230 ret = dasd_generic_last_path_gone(device); 3231 break; 3232 case CIO_OPER: 3233 ret = 1; 3234 if (device->path_data.opm) 3235 ret = dasd_generic_path_operational(device); 3236 break; 3237 } 3238 dasd_put_device(device); 3239 return ret; 3240 } 3241 3242 void dasd_generic_path_event(struct ccw_device *cdev, int *path_event) 3243 { 3244 int chp; 3245 __u8 oldopm, eventlpm; 3246 struct dasd_device *device; 3247 3248 device = dasd_device_from_cdev_locked(cdev); 3249 if (IS_ERR(device)) 3250 return; 3251 for (chp = 0; chp < 8; chp++) { 3252 eventlpm = 0x80 >> chp; 3253 if (path_event[chp] & PE_PATH_GONE) { 3254 oldopm = device->path_data.opm; 3255 device->path_data.opm &= ~eventlpm; 3256 device->path_data.ppm &= ~eventlpm; 3257 device->path_data.npm &= ~eventlpm; 3258 if (oldopm && !device->path_data.opm) 3259 dasd_generic_last_path_gone(device); 3260 } 3261 if (path_event[chp] & PE_PATH_AVAILABLE) { 3262 device->path_data.opm &= ~eventlpm; 3263 device->path_data.ppm &= ~eventlpm; 3264 device->path_data.npm &= ~eventlpm; 3265 device->path_data.tbvpm |= eventlpm; 3266 dasd_schedule_device_bh(device); 3267 } 3268 if (path_event[chp] & PE_PATHGROUP_ESTABLISHED) { 3269 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 3270 "Pathgroup re-established\n"); 3271 if (device->discipline->kick_validate) 3272 device->discipline->kick_validate(device); 3273 } 3274 } 3275 dasd_put_device(device); 3276 } 3277 EXPORT_SYMBOL_GPL(dasd_generic_path_event); 3278 3279 int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm) 3280 { 3281 if (!device->path_data.opm && lpm) { 3282 device->path_data.opm = lpm; 3283 dasd_generic_path_operational(device); 3284 } else 3285 device->path_data.opm |= lpm; 3286 return 0; 3287 } 3288 EXPORT_SYMBOL_GPL(dasd_generic_verify_path); 3289 3290 3291 int dasd_generic_pm_freeze(struct ccw_device *cdev) 3292 { 3293 struct dasd_ccw_req *cqr, *n; 3294 int rc; 3295 struct list_head freeze_queue; 3296 struct dasd_device *device = dasd_device_from_cdev(cdev); 3297 3298 if (IS_ERR(device)) 3299 return PTR_ERR(device); 3300 3301 /* mark device as suspended */ 3302 set_bit(DASD_FLAG_SUSPENDED, &device->flags); 3303 3304 if (device->discipline->freeze) 3305 rc = device->discipline->freeze(device); 3306 3307 /* disallow new I/O */ 3308 dasd_device_set_stop_bits(device, DASD_STOPPED_PM); 3309 /* clear active requests */ 3310 INIT_LIST_HEAD(&freeze_queue); 3311 spin_lock_irq(get_ccwdev_lock(cdev)); 3312 rc = 0; 3313 list_for_each_entry_safe(cqr, n, &device->ccw_queue, devlist) { 3314 /* Check status and move request to flush_queue */ 3315 if (cqr->status == DASD_CQR_IN_IO) { 3316 rc = device->discipline->term_IO(cqr); 3317 if (rc) { 3318 /* unable to terminate requeust */ 3319 dev_err(&device->cdev->dev, 3320 "Unable to terminate request %p " 3321 "on suspend\n", cqr); 3322 spin_unlock_irq(get_ccwdev_lock(cdev)); 3323 dasd_put_device(device); 3324 return rc; 3325 } 3326 } 3327 list_move_tail(&cqr->devlist, &freeze_queue); 3328 } 3329 3330 spin_unlock_irq(get_ccwdev_lock(cdev)); 3331 3332 list_for_each_entry_safe(cqr, n, &freeze_queue, devlist) { 3333 wait_event(dasd_flush_wq, 3334 (cqr->status != DASD_CQR_CLEAR_PENDING)); 3335 if (cqr->status == DASD_CQR_CLEARED) 3336 cqr->status = DASD_CQR_QUEUED; 3337 } 3338 /* move freeze_queue to start of the ccw_queue */ 3339 spin_lock_irq(get_ccwdev_lock(cdev)); 3340 list_splice_tail(&freeze_queue, &device->ccw_queue); 3341 spin_unlock_irq(get_ccwdev_lock(cdev)); 3342 3343 dasd_put_device(device); 3344 return rc; 3345 } 3346 EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze); 3347 3348 int dasd_generic_restore_device(struct ccw_device *cdev) 3349 { 3350 struct dasd_device *device = dasd_device_from_cdev(cdev); 3351 int rc = 0; 3352 3353 if (IS_ERR(device)) 3354 return PTR_ERR(device); 3355 3356 /* allow new IO again */ 3357 dasd_device_remove_stop_bits(device, 3358 (DASD_STOPPED_PM | DASD_UNRESUMED_PM)); 3359 3360 dasd_schedule_device_bh(device); 3361 3362 /* 3363 * call discipline restore function 3364 * if device is stopped do nothing e.g. for disconnected devices 3365 */ 3366 if (device->discipline->restore && !(device->stopped)) 3367 rc = device->discipline->restore(device); 3368 if (rc || device->stopped) 3369 /* 3370 * if the resume failed for the DASD we put it in 3371 * an UNRESUMED stop state 3372 */ 3373 device->stopped |= DASD_UNRESUMED_PM; 3374 3375 if (device->block) 3376 dasd_schedule_block_bh(device->block); 3377 3378 clear_bit(DASD_FLAG_SUSPENDED, &device->flags); 3379 dasd_put_device(device); 3380 return 0; 3381 } 3382 EXPORT_SYMBOL_GPL(dasd_generic_restore_device); 3383 3384 static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device, 3385 void *rdc_buffer, 3386 int rdc_buffer_size, 3387 int magic) 3388 { 3389 struct dasd_ccw_req *cqr; 3390 struct ccw1 *ccw; 3391 unsigned long *idaw; 3392 3393 cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device); 3394 3395 if (IS_ERR(cqr)) { 3396 /* internal error 13 - Allocating the RDC request failed*/ 3397 dev_err(&device->cdev->dev, 3398 "An error occurred in the DASD device driver, " 3399 "reason=%s\n", "13"); 3400 return cqr; 3401 } 3402 3403 ccw = cqr->cpaddr; 3404 ccw->cmd_code = CCW_CMD_RDC; 3405 if (idal_is_needed(rdc_buffer, rdc_buffer_size)) { 3406 idaw = (unsigned long *) (cqr->data); 3407 ccw->cda = (__u32)(addr_t) idaw; 3408 ccw->flags = CCW_FLAG_IDA; 3409 idaw = idal_create_words(idaw, rdc_buffer, rdc_buffer_size); 3410 } else { 3411 ccw->cda = (__u32)(addr_t) rdc_buffer; 3412 ccw->flags = 0; 3413 } 3414 3415 ccw->count = rdc_buffer_size; 3416 cqr->startdev = device; 3417 cqr->memdev = device; 3418 cqr->expires = 10*HZ; 3419 cqr->retries = 256; 3420 cqr->buildclk = get_clock(); 3421 cqr->status = DASD_CQR_FILLED; 3422 return cqr; 3423 } 3424 3425 3426 int dasd_generic_read_dev_chars(struct dasd_device *device, int magic, 3427 void *rdc_buffer, int rdc_buffer_size) 3428 { 3429 int ret; 3430 struct dasd_ccw_req *cqr; 3431 3432 cqr = dasd_generic_build_rdc(device, rdc_buffer, rdc_buffer_size, 3433 magic); 3434 if (IS_ERR(cqr)) 3435 return PTR_ERR(cqr); 3436 3437 ret = dasd_sleep_on(cqr); 3438 dasd_sfree_request(cqr, cqr->memdev); 3439 return ret; 3440 } 3441 EXPORT_SYMBOL_GPL(dasd_generic_read_dev_chars); 3442 3443 /* 3444 * In command mode and transport mode we need to look for sense 3445 * data in different places. The sense data itself is allways 3446 * an array of 32 bytes, so we can unify the sense data access 3447 * for both modes. 3448 */ 3449 char *dasd_get_sense(struct irb *irb) 3450 { 3451 struct tsb *tsb = NULL; 3452 char *sense = NULL; 3453 3454 if (scsw_is_tm(&irb->scsw) && (irb->scsw.tm.fcxs == 0x01)) { 3455 if (irb->scsw.tm.tcw) 3456 tsb = tcw_get_tsb((struct tcw *)(unsigned long) 3457 irb->scsw.tm.tcw); 3458 if (tsb && tsb->length == 64 && tsb->flags) 3459 switch (tsb->flags & 0x07) { 3460 case 1: /* tsa_iostat */ 3461 sense = tsb->tsa.iostat.sense; 3462 break; 3463 case 2: /* tsa_ddpc */ 3464 sense = tsb->tsa.ddpc.sense; 3465 break; 3466 default: 3467 /* currently we don't use interrogate data */ 3468 break; 3469 } 3470 } else if (irb->esw.esw0.erw.cons) { 3471 sense = irb->ecw; 3472 } 3473 return sense; 3474 } 3475 EXPORT_SYMBOL_GPL(dasd_get_sense); 3476 3477 static int __init dasd_init(void) 3478 { 3479 int rc; 3480 3481 init_waitqueue_head(&dasd_init_waitq); 3482 init_waitqueue_head(&dasd_flush_wq); 3483 init_waitqueue_head(&generic_waitq); 3484 3485 /* register 'common' DASD debug area, used for all DBF_XXX calls */ 3486 dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long)); 3487 if (dasd_debug_area == NULL) { 3488 rc = -ENOMEM; 3489 goto failed; 3490 } 3491 debug_register_view(dasd_debug_area, &debug_sprintf_view); 3492 debug_set_level(dasd_debug_area, DBF_WARNING); 3493 3494 DBF_EVENT(DBF_EMERG, "%s", "debug area created"); 3495 3496 dasd_diag_discipline_pointer = NULL; 3497 3498 dasd_statistics_createroot(); 3499 3500 rc = dasd_devmap_init(); 3501 if (rc) 3502 goto failed; 3503 rc = dasd_gendisk_init(); 3504 if (rc) 3505 goto failed; 3506 rc = dasd_parse(); 3507 if (rc) 3508 goto failed; 3509 rc = dasd_eer_init(); 3510 if (rc) 3511 goto failed; 3512 #ifdef CONFIG_PROC_FS 3513 rc = dasd_proc_init(); 3514 if (rc) 3515 goto failed; 3516 #endif 3517 3518 return 0; 3519 failed: 3520 pr_info("The DASD device driver could not be initialized\n"); 3521 dasd_exit(); 3522 return rc; 3523 } 3524 3525 module_init(dasd_init); 3526 module_exit(dasd_exit); 3527 3528 EXPORT_SYMBOL(dasd_debug_area); 3529 EXPORT_SYMBOL(dasd_diag_discipline_pointer); 3530 3531 EXPORT_SYMBOL(dasd_add_request_head); 3532 EXPORT_SYMBOL(dasd_add_request_tail); 3533 EXPORT_SYMBOL(dasd_cancel_req); 3534 EXPORT_SYMBOL(dasd_device_clear_timer); 3535 EXPORT_SYMBOL(dasd_block_clear_timer); 3536 EXPORT_SYMBOL(dasd_enable_device); 3537 EXPORT_SYMBOL(dasd_int_handler); 3538 EXPORT_SYMBOL(dasd_kfree_request); 3539 EXPORT_SYMBOL(dasd_kick_device); 3540 EXPORT_SYMBOL(dasd_kmalloc_request); 3541 EXPORT_SYMBOL(dasd_schedule_device_bh); 3542 EXPORT_SYMBOL(dasd_schedule_block_bh); 3543 EXPORT_SYMBOL(dasd_set_target_state); 3544 EXPORT_SYMBOL(dasd_device_set_timer); 3545 EXPORT_SYMBOL(dasd_block_set_timer); 3546 EXPORT_SYMBOL(dasd_sfree_request); 3547 EXPORT_SYMBOL(dasd_sleep_on); 3548 EXPORT_SYMBOL(dasd_sleep_on_immediatly); 3549 EXPORT_SYMBOL(dasd_sleep_on_interruptible); 3550 EXPORT_SYMBOL(dasd_smalloc_request); 3551 EXPORT_SYMBOL(dasd_start_IO); 3552 EXPORT_SYMBOL(dasd_term_IO); 3553 3554 EXPORT_SYMBOL_GPL(dasd_generic_probe); 3555 EXPORT_SYMBOL_GPL(dasd_generic_remove); 3556 EXPORT_SYMBOL_GPL(dasd_generic_notify); 3557 EXPORT_SYMBOL_GPL(dasd_generic_set_online); 3558 EXPORT_SYMBOL_GPL(dasd_generic_set_offline); 3559 EXPORT_SYMBOL_GPL(dasd_generic_handle_state_change); 3560 EXPORT_SYMBOL_GPL(dasd_flush_device_queue); 3561 EXPORT_SYMBOL_GPL(dasd_alloc_block); 3562 EXPORT_SYMBOL_GPL(dasd_free_block); 3563