scsi_sysfs.c revision a6a8d9f87eb8510a8f53672ea87703f62185d75f
1/* 2 * scsi_sysfs.c 3 * 4 * SCSI sysfs interface routines. 5 * 6 * Created to pull SCSI mid layer sysfs routines into one file. 7 */ 8 9#include <linux/module.h> 10#include <linux/init.h> 11#include <linux/blkdev.h> 12#include <linux/device.h> 13 14#include <scsi/scsi.h> 15#include <scsi/scsi_device.h> 16#include <scsi/scsi_host.h> 17#include <scsi/scsi_tcq.h> 18#include <scsi/scsi_transport.h> 19#include <scsi/scsi_driver.h> 20 21#include "scsi_priv.h" 22#include "scsi_logging.h" 23 24static struct device_type scsi_dev_type; 25 26static const struct { 27 enum scsi_device_state value; 28 char *name; 29} sdev_states[] = { 30 { SDEV_CREATED, "created" }, 31 { SDEV_RUNNING, "running" }, 32 { SDEV_CANCEL, "cancel" }, 33 { SDEV_DEL, "deleted" }, 34 { SDEV_QUIESCE, "quiesce" }, 35 { SDEV_OFFLINE, "offline" }, 36 { SDEV_BLOCK, "blocked" }, 37}; 38 39const char *scsi_device_state_name(enum scsi_device_state state) 40{ 41 int i; 42 char *name = NULL; 43 44 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) { 45 if (sdev_states[i].value == state) { 46 name = sdev_states[i].name; 47 break; 48 } 49 } 50 return name; 51} 52 53static const struct { 54 enum scsi_host_state value; 55 char *name; 56} shost_states[] = { 57 { SHOST_CREATED, "created" }, 58 { SHOST_RUNNING, "running" }, 59 { SHOST_CANCEL, "cancel" }, 60 { SHOST_DEL, "deleted" }, 61 { SHOST_RECOVERY, "recovery" }, 62 { SHOST_CANCEL_RECOVERY, "cancel/recovery" }, 63 { SHOST_DEL_RECOVERY, "deleted/recovery", }, 64}; 65const char *scsi_host_state_name(enum scsi_host_state state) 66{ 67 int i; 68 char *name = NULL; 69 70 for (i = 0; i < ARRAY_SIZE(shost_states); i++) { 71 if (shost_states[i].value == state) { 72 name = shost_states[i].name; 73 break; 74 } 75 } 76 return name; 77} 78 79static int check_set(unsigned int *val, char *src) 80{ 81 char *last; 82 83 if (strncmp(src, "-", 20) == 0) { 84 *val = SCAN_WILD_CARD; 85 } else { 86 /* 87 * Doesn't check for int overflow 88 */ 89 *val = simple_strtoul(src, &last, 0); 90 if (*last != '\0') 91 return 1; 92 } 93 return 0; 94} 95 96static int scsi_scan(struct Scsi_Host *shost, const char *str) 97{ 98 char s1[15], s2[15], s3[15], junk; 99 unsigned int channel, id, lun; 100 int res; 101 102 res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk); 103 if (res != 3) 104 return -EINVAL; 105 if (check_set(&channel, s1)) 106 return -EINVAL; 107 if (check_set(&id, s2)) 108 return -EINVAL; 109 if (check_set(&lun, s3)) 110 return -EINVAL; 111 if (shost->transportt->user_scan) 112 res = shost->transportt->user_scan(shost, channel, id, lun); 113 else 114 res = scsi_scan_host_selected(shost, channel, id, lun, 1); 115 return res; 116} 117 118/* 119 * shost_show_function: macro to create an attr function that can be used to 120 * show a non-bit field. 121 */ 122#define shost_show_function(name, field, format_string) \ 123static ssize_t \ 124show_##name (struct device *dev, struct device_attribute *attr, \ 125 char *buf) \ 126{ \ 127 struct Scsi_Host *shost = class_to_shost(dev); \ 128 return snprintf (buf, 20, format_string, shost->field); \ 129} 130 131/* 132 * shost_rd_attr: macro to create a function and attribute variable for a 133 * read only field. 134 */ 135#define shost_rd_attr2(name, field, format_string) \ 136 shost_show_function(name, field, format_string) \ 137static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL); 138 139#define shost_rd_attr(field, format_string) \ 140shost_rd_attr2(field, field, format_string) 141 142/* 143 * Create the actual show/store functions and data structures. 144 */ 145 146static ssize_t 147store_scan(struct device *dev, struct device_attribute *attr, 148 const char *buf, size_t count) 149{ 150 struct Scsi_Host *shost = class_to_shost(dev); 151 int res; 152 153 res = scsi_scan(shost, buf); 154 if (res == 0) 155 res = count; 156 return res; 157}; 158static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan); 159 160static ssize_t 161store_shost_state(struct device *dev, struct device_attribute *attr, 162 const char *buf, size_t count) 163{ 164 int i; 165 struct Scsi_Host *shost = class_to_shost(dev); 166 enum scsi_host_state state = 0; 167 168 for (i = 0; i < ARRAY_SIZE(shost_states); i++) { 169 const int len = strlen(shost_states[i].name); 170 if (strncmp(shost_states[i].name, buf, len) == 0 && 171 buf[len] == '\n') { 172 state = shost_states[i].value; 173 break; 174 } 175 } 176 if (!state) 177 return -EINVAL; 178 179 if (scsi_host_set_state(shost, state)) 180 return -EINVAL; 181 return count; 182} 183 184static ssize_t 185show_shost_state(struct device *dev, struct device_attribute *attr, char *buf) 186{ 187 struct Scsi_Host *shost = class_to_shost(dev); 188 const char *name = scsi_host_state_name(shost->shost_state); 189 190 if (!name) 191 return -EINVAL; 192 193 return snprintf(buf, 20, "%s\n", name); 194} 195 196/* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */ 197struct device_attribute dev_attr_hstate = 198 __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state); 199 200static ssize_t 201show_shost_mode(unsigned int mode, char *buf) 202{ 203 ssize_t len = 0; 204 205 if (mode & MODE_INITIATOR) 206 len = sprintf(buf, "%s", "Initiator"); 207 208 if (mode & MODE_TARGET) 209 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target"); 210 211 len += sprintf(buf + len, "\n"); 212 213 return len; 214} 215 216static ssize_t 217show_shost_supported_mode(struct device *dev, struct device_attribute *attr, 218 char *buf) 219{ 220 struct Scsi_Host *shost = class_to_shost(dev); 221 unsigned int supported_mode = shost->hostt->supported_mode; 222 223 if (supported_mode == MODE_UNKNOWN) 224 /* by default this should be initiator */ 225 supported_mode = MODE_INITIATOR; 226 227 return show_shost_mode(supported_mode, buf); 228} 229 230static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL); 231 232static ssize_t 233show_shost_active_mode(struct device *dev, 234 struct device_attribute *attr, char *buf) 235{ 236 struct Scsi_Host *shost = class_to_shost(dev); 237 238 if (shost->active_mode == MODE_UNKNOWN) 239 return snprintf(buf, 20, "unknown\n"); 240 else 241 return show_shost_mode(shost->active_mode, buf); 242} 243 244static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL); 245 246shost_rd_attr(unique_id, "%u\n"); 247shost_rd_attr(host_busy, "%hu\n"); 248shost_rd_attr(cmd_per_lun, "%hd\n"); 249shost_rd_attr(can_queue, "%hd\n"); 250shost_rd_attr(sg_tablesize, "%hu\n"); 251shost_rd_attr(unchecked_isa_dma, "%d\n"); 252shost_rd_attr2(proc_name, hostt->proc_name, "%s\n"); 253 254static struct attribute *scsi_sysfs_shost_attrs[] = { 255 &dev_attr_unique_id.attr, 256 &dev_attr_host_busy.attr, 257 &dev_attr_cmd_per_lun.attr, 258 &dev_attr_can_queue.attr, 259 &dev_attr_sg_tablesize.attr, 260 &dev_attr_unchecked_isa_dma.attr, 261 &dev_attr_proc_name.attr, 262 &dev_attr_scan.attr, 263 &dev_attr_hstate.attr, 264 &dev_attr_supported_mode.attr, 265 &dev_attr_active_mode.attr, 266 NULL 267}; 268 269struct attribute_group scsi_shost_attr_group = { 270 .attrs = scsi_sysfs_shost_attrs, 271}; 272 273struct attribute_group *scsi_sysfs_shost_attr_groups[] = { 274 &scsi_shost_attr_group, 275 NULL 276}; 277 278static void scsi_device_cls_release(struct device *class_dev) 279{ 280 struct scsi_device *sdev; 281 282 sdev = class_to_sdev(class_dev); 283 put_device(&sdev->sdev_gendev); 284} 285 286static void scsi_device_dev_release_usercontext(struct work_struct *work) 287{ 288 struct scsi_device *sdev; 289 struct device *parent; 290 struct scsi_target *starget; 291 struct list_head *this, *tmp; 292 unsigned long flags; 293 294 sdev = container_of(work, struct scsi_device, ew.work); 295 296 parent = sdev->sdev_gendev.parent; 297 starget = to_scsi_target(parent); 298 299 spin_lock_irqsave(sdev->host->host_lock, flags); 300 starget->reap_ref++; 301 list_del(&sdev->siblings); 302 list_del(&sdev->same_target_siblings); 303 list_del(&sdev->starved_entry); 304 spin_unlock_irqrestore(sdev->host->host_lock, flags); 305 306 cancel_work_sync(&sdev->event_work); 307 308 list_for_each_safe(this, tmp, &sdev->event_list) { 309 struct scsi_event *evt; 310 311 evt = list_entry(this, struct scsi_event, node); 312 list_del(&evt->node); 313 kfree(evt); 314 } 315 316 if (sdev->request_queue) { 317 sdev->request_queue->queuedata = NULL; 318 /* user context needed to free queue */ 319 scsi_free_queue(sdev->request_queue); 320 /* temporary expedient, try to catch use of queue lock 321 * after free of sdev */ 322 sdev->request_queue = NULL; 323 } 324 325 scsi_target_reap(scsi_target(sdev)); 326 327 kfree(sdev->inquiry); 328 kfree(sdev); 329 330 if (parent) 331 put_device(parent); 332} 333 334static void scsi_device_dev_release(struct device *dev) 335{ 336 struct scsi_device *sdp = to_scsi_device(dev); 337 execute_in_process_context(scsi_device_dev_release_usercontext, 338 &sdp->ew); 339} 340 341static struct class sdev_class = { 342 .name = "scsi_device", 343 .dev_release = scsi_device_cls_release, 344}; 345 346/* all probing is done in the individual ->probe routines */ 347static int scsi_bus_match(struct device *dev, struct device_driver *gendrv) 348{ 349 struct scsi_device *sdp; 350 351 if (dev->type != &scsi_dev_type) 352 return 0; 353 354 sdp = to_scsi_device(dev); 355 if (sdp->no_uld_attach) 356 return 0; 357 return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0; 358} 359 360static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env) 361{ 362 struct scsi_device *sdev; 363 364 if (dev->type != &scsi_dev_type) 365 return 0; 366 367 sdev = to_scsi_device(dev); 368 369 add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type); 370 return 0; 371} 372 373static int scsi_bus_suspend(struct device * dev, pm_message_t state) 374{ 375 struct device_driver *drv; 376 struct scsi_device *sdev; 377 int err; 378 379 if (dev->type != &scsi_dev_type) 380 return 0; 381 382 drv = dev->driver; 383 sdev = to_scsi_device(dev); 384 385 err = scsi_device_quiesce(sdev); 386 if (err) 387 return err; 388 389 if (drv && drv->suspend) { 390 err = drv->suspend(dev, state); 391 if (err) 392 return err; 393 } 394 395 return 0; 396} 397 398static int scsi_bus_resume(struct device * dev) 399{ 400 struct device_driver *drv; 401 struct scsi_device *sdev; 402 int err = 0; 403 404 if (dev->type != &scsi_dev_type) 405 return 0; 406 407 drv = dev->driver; 408 sdev = to_scsi_device(dev); 409 410 if (drv && drv->resume) 411 err = drv->resume(dev); 412 413 scsi_device_resume(sdev); 414 415 return err; 416} 417 418static int scsi_bus_remove(struct device *dev) 419{ 420 struct device_driver *drv = dev->driver; 421 struct scsi_device *sdev = to_scsi_device(dev); 422 int err = 0; 423 424 /* reset the prep_fn back to the default since the 425 * driver may have altered it and it's being removed */ 426 blk_queue_prep_rq(sdev->request_queue, scsi_prep_fn); 427 428 if (drv && drv->remove) 429 err = drv->remove(dev); 430 431 return 0; 432} 433 434struct bus_type scsi_bus_type = { 435 .name = "scsi", 436 .match = scsi_bus_match, 437 .uevent = scsi_bus_uevent, 438 .suspend = scsi_bus_suspend, 439 .resume = scsi_bus_resume, 440 .remove = scsi_bus_remove, 441}; 442EXPORT_SYMBOL_GPL(scsi_bus_type); 443 444int scsi_sysfs_register(void) 445{ 446 int error; 447 448 error = bus_register(&scsi_bus_type); 449 if (!error) { 450 error = class_register(&sdev_class); 451 if (error) 452 bus_unregister(&scsi_bus_type); 453 } 454 455 return error; 456} 457 458void scsi_sysfs_unregister(void) 459{ 460 class_unregister(&sdev_class); 461 bus_unregister(&scsi_bus_type); 462} 463 464/* 465 * sdev_show_function: macro to create an attr function that can be used to 466 * show a non-bit field. 467 */ 468#define sdev_show_function(field, format_string) \ 469static ssize_t \ 470sdev_show_##field (struct device *dev, struct device_attribute *attr, \ 471 char *buf) \ 472{ \ 473 struct scsi_device *sdev; \ 474 sdev = to_scsi_device(dev); \ 475 return snprintf (buf, 20, format_string, sdev->field); \ 476} \ 477 478/* 479 * sdev_rd_attr: macro to create a function and attribute variable for a 480 * read only field. 481 */ 482#define sdev_rd_attr(field, format_string) \ 483 sdev_show_function(field, format_string) \ 484static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL); 485 486 487/* 488 * sdev_rd_attr: create a function and attribute variable for a 489 * read/write field. 490 */ 491#define sdev_rw_attr(field, format_string) \ 492 sdev_show_function(field, format_string) \ 493 \ 494static ssize_t \ 495sdev_store_##field (struct device *dev, struct device_attribute *attr, \ 496 const char *buf, size_t count) \ 497{ \ 498 struct scsi_device *sdev; \ 499 sdev = to_scsi_device(dev); \ 500 snscanf (buf, 20, format_string, &sdev->field); \ 501 return count; \ 502} \ 503static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); 504 505/* Currently we don't export bit fields, but we might in future, 506 * so leave this code in */ 507#if 0 508/* 509 * sdev_rd_attr: create a function and attribute variable for a 510 * read/write bit field. 511 */ 512#define sdev_rw_attr_bit(field) \ 513 sdev_show_function(field, "%d\n") \ 514 \ 515static ssize_t \ 516sdev_store_##field (struct device *dev, struct device_attribute *attr, \ 517 const char *buf, size_t count) \ 518{ \ 519 int ret; \ 520 struct scsi_device *sdev; \ 521 ret = scsi_sdev_check_buf_bit(buf); \ 522 if (ret >= 0) { \ 523 sdev = to_scsi_device(dev); \ 524 sdev->field = ret; \ 525 ret = count; \ 526 } \ 527 return ret; \ 528} \ 529static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); 530 531/* 532 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1", 533 * else return -EINVAL. 534 */ 535static int scsi_sdev_check_buf_bit(const char *buf) 536{ 537 if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) { 538 if (buf[0] == '1') 539 return 1; 540 else if (buf[0] == '0') 541 return 0; 542 else 543 return -EINVAL; 544 } else 545 return -EINVAL; 546} 547#endif 548/* 549 * Create the actual show/store functions and data structures. 550 */ 551sdev_rd_attr (device_blocked, "%d\n"); 552sdev_rd_attr (queue_depth, "%d\n"); 553sdev_rd_attr (type, "%d\n"); 554sdev_rd_attr (scsi_level, "%d\n"); 555sdev_rd_attr (vendor, "%.8s\n"); 556sdev_rd_attr (model, "%.16s\n"); 557sdev_rd_attr (rev, "%.4s\n"); 558 559static ssize_t 560sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf) 561{ 562 struct scsi_device *sdev; 563 sdev = to_scsi_device(dev); 564 return snprintf (buf, 20, "%d\n", sdev->timeout / HZ); 565} 566 567static ssize_t 568sdev_store_timeout (struct device *dev, struct device_attribute *attr, 569 const char *buf, size_t count) 570{ 571 struct scsi_device *sdev; 572 int timeout; 573 sdev = to_scsi_device(dev); 574 sscanf (buf, "%d\n", &timeout); 575 sdev->timeout = timeout * HZ; 576 return count; 577} 578static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout); 579 580static ssize_t 581store_rescan_field (struct device *dev, struct device_attribute *attr, 582 const char *buf, size_t count) 583{ 584 scsi_rescan_device(dev); 585 return count; 586} 587static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field); 588 589static void sdev_store_delete_callback(struct device *dev) 590{ 591 scsi_remove_device(to_scsi_device(dev)); 592} 593 594static ssize_t 595sdev_store_delete(struct device *dev, struct device_attribute *attr, 596 const char *buf, size_t count) 597{ 598 int rc; 599 600 /* An attribute cannot be unregistered by one of its own methods, 601 * so we have to use this roundabout approach. 602 */ 603 rc = device_schedule_callback(dev, sdev_store_delete_callback); 604 if (rc) 605 count = rc; 606 return count; 607}; 608static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete); 609 610static ssize_t 611store_state_field(struct device *dev, struct device_attribute *attr, 612 const char *buf, size_t count) 613{ 614 int i; 615 struct scsi_device *sdev = to_scsi_device(dev); 616 enum scsi_device_state state = 0; 617 618 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) { 619 const int len = strlen(sdev_states[i].name); 620 if (strncmp(sdev_states[i].name, buf, len) == 0 && 621 buf[len] == '\n') { 622 state = sdev_states[i].value; 623 break; 624 } 625 } 626 if (!state) 627 return -EINVAL; 628 629 if (scsi_device_set_state(sdev, state)) 630 return -EINVAL; 631 return count; 632} 633 634static ssize_t 635show_state_field(struct device *dev, struct device_attribute *attr, char *buf) 636{ 637 struct scsi_device *sdev = to_scsi_device(dev); 638 const char *name = scsi_device_state_name(sdev->sdev_state); 639 640 if (!name) 641 return -EINVAL; 642 643 return snprintf(buf, 20, "%s\n", name); 644} 645 646static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field); 647 648static ssize_t 649show_queue_type_field(struct device *dev, struct device_attribute *attr, 650 char *buf) 651{ 652 struct scsi_device *sdev = to_scsi_device(dev); 653 const char *name = "none"; 654 655 if (sdev->ordered_tags) 656 name = "ordered"; 657 else if (sdev->simple_tags) 658 name = "simple"; 659 660 return snprintf(buf, 20, "%s\n", name); 661} 662 663static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL); 664 665static ssize_t 666show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf) 667{ 668 return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8); 669} 670 671static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL); 672 673#define show_sdev_iostat(field) \ 674static ssize_t \ 675show_iostat_##field(struct device *dev, struct device_attribute *attr, \ 676 char *buf) \ 677{ \ 678 struct scsi_device *sdev = to_scsi_device(dev); \ 679 unsigned long long count = atomic_read(&sdev->field); \ 680 return snprintf(buf, 20, "0x%llx\n", count); \ 681} \ 682static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL) 683 684show_sdev_iostat(iorequest_cnt); 685show_sdev_iostat(iodone_cnt); 686show_sdev_iostat(ioerr_cnt); 687 688static ssize_t 689sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf) 690{ 691 struct scsi_device *sdev; 692 sdev = to_scsi_device(dev); 693 return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type); 694} 695static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL); 696 697#define DECLARE_EVT_SHOW(name, Cap_name) \ 698static ssize_t \ 699sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \ 700 char *buf) \ 701{ \ 702 struct scsi_device *sdev = to_scsi_device(dev); \ 703 int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\ 704 return snprintf(buf, 20, "%d\n", val); \ 705} 706 707#define DECLARE_EVT_STORE(name, Cap_name) \ 708static ssize_t \ 709sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\ 710 const char *buf, size_t count) \ 711{ \ 712 struct scsi_device *sdev = to_scsi_device(dev); \ 713 int val = simple_strtoul(buf, NULL, 0); \ 714 if (val == 0) \ 715 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \ 716 else if (val == 1) \ 717 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \ 718 else \ 719 return -EINVAL; \ 720 return count; \ 721} 722 723#define DECLARE_EVT(name, Cap_name) \ 724 DECLARE_EVT_SHOW(name, Cap_name) \ 725 DECLARE_EVT_STORE(name, Cap_name) \ 726 static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name, \ 727 sdev_store_evt_##name); 728#define REF_EVT(name) &dev_attr_evt_##name.attr 729 730DECLARE_EVT(media_change, MEDIA_CHANGE) 731 732/* Default template for device attributes. May NOT be modified */ 733static struct attribute *scsi_sdev_attrs[] = { 734 &dev_attr_device_blocked.attr, 735 &dev_attr_type.attr, 736 &dev_attr_scsi_level.attr, 737 &dev_attr_vendor.attr, 738 &dev_attr_model.attr, 739 &dev_attr_rev.attr, 740 &dev_attr_rescan.attr, 741 &dev_attr_delete.attr, 742 &dev_attr_state.attr, 743 &dev_attr_timeout.attr, 744 &dev_attr_iocounterbits.attr, 745 &dev_attr_iorequest_cnt.attr, 746 &dev_attr_iodone_cnt.attr, 747 &dev_attr_ioerr_cnt.attr, 748 &dev_attr_modalias.attr, 749 REF_EVT(media_change), 750 NULL 751}; 752 753static struct attribute_group scsi_sdev_attr_group = { 754 .attrs = scsi_sdev_attrs, 755}; 756 757static struct attribute_group *scsi_sdev_attr_groups[] = { 758 &scsi_sdev_attr_group, 759 NULL 760}; 761 762static ssize_t 763sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr, 764 const char *buf, size_t count) 765{ 766 int depth, retval; 767 struct scsi_device *sdev = to_scsi_device(dev); 768 struct scsi_host_template *sht = sdev->host->hostt; 769 770 if (!sht->change_queue_depth) 771 return -EINVAL; 772 773 depth = simple_strtoul(buf, NULL, 0); 774 775 if (depth < 1) 776 return -EINVAL; 777 778 retval = sht->change_queue_depth(sdev, depth); 779 if (retval < 0) 780 return retval; 781 782 return count; 783} 784 785static struct device_attribute sdev_attr_queue_depth_rw = 786 __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth, 787 sdev_store_queue_depth_rw); 788 789static ssize_t 790sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr, 791 const char *buf, size_t count) 792{ 793 struct scsi_device *sdev = to_scsi_device(dev); 794 struct scsi_host_template *sht = sdev->host->hostt; 795 int tag_type = 0, retval; 796 int prev_tag_type = scsi_get_tag_type(sdev); 797 798 if (!sdev->tagged_supported || !sht->change_queue_type) 799 return -EINVAL; 800 801 if (strncmp(buf, "ordered", 7) == 0) 802 tag_type = MSG_ORDERED_TAG; 803 else if (strncmp(buf, "simple", 6) == 0) 804 tag_type = MSG_SIMPLE_TAG; 805 else if (strncmp(buf, "none", 4) != 0) 806 return -EINVAL; 807 808 if (tag_type == prev_tag_type) 809 return count; 810 811 retval = sht->change_queue_type(sdev, tag_type); 812 if (retval < 0) 813 return retval; 814 815 return count; 816} 817 818static int scsi_target_add(struct scsi_target *starget) 819{ 820 int error; 821 822 if (starget->state != STARGET_CREATED) 823 return 0; 824 825 error = device_add(&starget->dev); 826 if (error) { 827 dev_err(&starget->dev, "target device_add failed, error %d\n", error); 828 get_device(&starget->dev); 829 scsi_target_reap(starget); 830 put_device(&starget->dev); 831 return error; 832 } 833 transport_add_device(&starget->dev); 834 starget->state = STARGET_RUNNING; 835 836 return 0; 837} 838 839static struct device_attribute sdev_attr_queue_type_rw = 840 __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field, 841 sdev_store_queue_type_rw); 842 843/** 844 * scsi_sysfs_add_sdev - add scsi device to sysfs 845 * @sdev: scsi_device to add 846 * 847 * Return value: 848 * 0 on Success / non-zero on Failure 849 **/ 850int scsi_sysfs_add_sdev(struct scsi_device *sdev) 851{ 852 int error, i; 853 struct request_queue *rq = sdev->request_queue; 854 struct scsi_target *starget = sdev->sdev_target; 855 856 if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0) 857 return error; 858 859 error = scsi_target_add(starget); 860 if (error) 861 return error; 862 863 transport_configure_device(&starget->dev); 864 error = device_add(&sdev->sdev_gendev); 865 if (error) { 866 put_device(sdev->sdev_gendev.parent); 867 printk(KERN_INFO "error 1\n"); 868 return error; 869 } 870 error = device_add(&sdev->sdev_dev); 871 if (error) { 872 printk(KERN_INFO "error 2\n"); 873 goto clean_device; 874 } 875 876 /* take a reference for the sdev_dev; this is 877 * released by the sdev_class .release */ 878 get_device(&sdev->sdev_gendev); 879 880 /* create queue files, which may be writable, depending on the host */ 881 if (sdev->host->hostt->change_queue_depth) 882 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_depth_rw); 883 else 884 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth); 885 if (error) { 886 __scsi_remove_device(sdev); 887 goto out; 888 } 889 if (sdev->host->hostt->change_queue_type) 890 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw); 891 else 892 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type); 893 if (error) { 894 __scsi_remove_device(sdev); 895 goto out; 896 } 897 898 error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL); 899 900 if (error) 901 sdev_printk(KERN_INFO, sdev, 902 "Failed to register bsg queue, errno=%d\n", error); 903 904 /* we're treating error on bsg register as non-fatal, so pretend 905 * nothing went wrong */ 906 error = 0; 907 908 /* add additional host specific attributes */ 909 if (sdev->host->hostt->sdev_attrs) { 910 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) { 911 error = device_create_file(&sdev->sdev_gendev, 912 sdev->host->hostt->sdev_attrs[i]); 913 if (error) { 914 __scsi_remove_device(sdev); 915 goto out; 916 } 917 } 918 } 919 920 transport_add_device(&sdev->sdev_gendev); 921 out: 922 return error; 923 924 clean_device: 925 scsi_device_set_state(sdev, SDEV_CANCEL); 926 927 device_del(&sdev->sdev_gendev); 928 transport_destroy_device(&sdev->sdev_gendev); 929 put_device(&sdev->sdev_gendev); 930 931 return error; 932} 933 934void __scsi_remove_device(struct scsi_device *sdev) 935{ 936 struct device *dev = &sdev->sdev_gendev; 937 938 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0) 939 return; 940 941 bsg_unregister_queue(sdev->request_queue); 942 device_unregister(&sdev->sdev_dev); 943 transport_remove_device(dev); 944 device_del(dev); 945 scsi_device_set_state(sdev, SDEV_DEL); 946 if (sdev->host->hostt->slave_destroy) 947 sdev->host->hostt->slave_destroy(sdev); 948 transport_destroy_device(dev); 949 put_device(dev); 950} 951 952/** 953 * scsi_remove_device - unregister a device from the scsi bus 954 * @sdev: scsi_device to unregister 955 **/ 956void scsi_remove_device(struct scsi_device *sdev) 957{ 958 struct Scsi_Host *shost = sdev->host; 959 960 mutex_lock(&shost->scan_mutex); 961 __scsi_remove_device(sdev); 962 mutex_unlock(&shost->scan_mutex); 963} 964EXPORT_SYMBOL(scsi_remove_device); 965 966static void __scsi_remove_target(struct scsi_target *starget) 967{ 968 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 969 unsigned long flags; 970 struct scsi_device *sdev; 971 972 spin_lock_irqsave(shost->host_lock, flags); 973 starget->reap_ref++; 974 restart: 975 list_for_each_entry(sdev, &shost->__devices, siblings) { 976 if (sdev->channel != starget->channel || 977 sdev->id != starget->id || 978 sdev->sdev_state == SDEV_DEL) 979 continue; 980 spin_unlock_irqrestore(shost->host_lock, flags); 981 scsi_remove_device(sdev); 982 spin_lock_irqsave(shost->host_lock, flags); 983 goto restart; 984 } 985 spin_unlock_irqrestore(shost->host_lock, flags); 986 scsi_target_reap(starget); 987} 988 989static int __remove_child (struct device * dev, void * data) 990{ 991 if (scsi_is_target_device(dev)) 992 __scsi_remove_target(to_scsi_target(dev)); 993 return 0; 994} 995 996/** 997 * scsi_remove_target - try to remove a target and all its devices 998 * @dev: generic starget or parent of generic stargets to be removed 999 * 1000 * Note: This is slightly racy. It is possible that if the user 1001 * requests the addition of another device then the target won't be 1002 * removed. 1003 */ 1004void scsi_remove_target(struct device *dev) 1005{ 1006 struct device *rdev; 1007 1008 if (scsi_is_target_device(dev)) { 1009 __scsi_remove_target(to_scsi_target(dev)); 1010 return; 1011 } 1012 1013 rdev = get_device(dev); 1014 device_for_each_child(dev, NULL, __remove_child); 1015 put_device(rdev); 1016} 1017EXPORT_SYMBOL(scsi_remove_target); 1018 1019int scsi_register_driver(struct device_driver *drv) 1020{ 1021 drv->bus = &scsi_bus_type; 1022 1023 return driver_register(drv); 1024} 1025EXPORT_SYMBOL(scsi_register_driver); 1026 1027int scsi_register_interface(struct class_interface *intf) 1028{ 1029 intf->class = &sdev_class; 1030 1031 return class_interface_register(intf); 1032} 1033EXPORT_SYMBOL(scsi_register_interface); 1034 1035/** 1036 * scsi_sysfs_add_host - add scsi host to subsystem 1037 * @shost: scsi host struct to add to subsystem 1038 * @dev: parent struct device pointer 1039 **/ 1040int scsi_sysfs_add_host(struct Scsi_Host *shost) 1041{ 1042 int error, i; 1043 1044 /* add host specific attributes */ 1045 if (shost->hostt->shost_attrs) { 1046 for (i = 0; shost->hostt->shost_attrs[i]; i++) { 1047 error = device_create_file(&shost->shost_dev, 1048 shost->hostt->shost_attrs[i]); 1049 if (error) 1050 return error; 1051 } 1052 } 1053 1054 transport_register_device(&shost->shost_gendev); 1055 transport_configure_device(&shost->shost_gendev); 1056 return 0; 1057} 1058 1059static struct device_type scsi_dev_type = { 1060 .name = "scsi_device", 1061 .release = scsi_device_dev_release, 1062 .groups = scsi_sdev_attr_groups, 1063}; 1064 1065void scsi_sysfs_device_initialize(struct scsi_device *sdev) 1066{ 1067 unsigned long flags; 1068 struct Scsi_Host *shost = sdev->host; 1069 struct scsi_target *starget = sdev->sdev_target; 1070 1071 device_initialize(&sdev->sdev_gendev); 1072 sdev->sdev_gendev.bus = &scsi_bus_type; 1073 sdev->sdev_gendev.type = &scsi_dev_type; 1074 sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d", 1075 sdev->host->host_no, sdev->channel, sdev->id, 1076 sdev->lun); 1077 1078 device_initialize(&sdev->sdev_dev); 1079 sdev->sdev_dev.parent = &sdev->sdev_gendev; 1080 sdev->sdev_dev.class = &sdev_class; 1081 snprintf(sdev->sdev_dev.bus_id, BUS_ID_SIZE, 1082 "%d:%d:%d:%d", sdev->host->host_no, 1083 sdev->channel, sdev->id, sdev->lun); 1084 sdev->scsi_level = starget->scsi_level; 1085 transport_setup_device(&sdev->sdev_gendev); 1086 spin_lock_irqsave(shost->host_lock, flags); 1087 list_add_tail(&sdev->same_target_siblings, &starget->devices); 1088 list_add_tail(&sdev->siblings, &shost->__devices); 1089 spin_unlock_irqrestore(shost->host_lock, flags); 1090} 1091 1092int scsi_is_sdev_device(const struct device *dev) 1093{ 1094 return dev->type == &scsi_dev_type; 1095} 1096EXPORT_SYMBOL(scsi_is_sdev_device); 1097 1098/* A blank transport template that is used in drivers that don't 1099 * yet implement Transport Attributes */ 1100struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, }; 1101