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