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 26 static struct device_type scsi_dev_type; 27 28 static 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_TRANSPORT_OFFLINE, "transport-offline" }, 39 { SDEV_BLOCK, "blocked" }, 40 { SDEV_CREATED_BLOCK, "created-blocked" }, 41 }; 42 43 const char *scsi_device_state_name(enum scsi_device_state state) 44 { 45 int i; 46 char *name = NULL; 47 48 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) { 49 if (sdev_states[i].value == state) { 50 name = sdev_states[i].name; 51 break; 52 } 53 } 54 return name; 55 } 56 57 static const struct { 58 enum scsi_host_state value; 59 char *name; 60 } shost_states[] = { 61 { SHOST_CREATED, "created" }, 62 { SHOST_RUNNING, "running" }, 63 { SHOST_CANCEL, "cancel" }, 64 { SHOST_DEL, "deleted" }, 65 { SHOST_RECOVERY, "recovery" }, 66 { SHOST_CANCEL_RECOVERY, "cancel/recovery" }, 67 { SHOST_DEL_RECOVERY, "deleted/recovery", }, 68 }; 69 const char *scsi_host_state_name(enum scsi_host_state state) 70 { 71 int i; 72 char *name = NULL; 73 74 for (i = 0; i < ARRAY_SIZE(shost_states); i++) { 75 if (shost_states[i].value == state) { 76 name = shost_states[i].name; 77 break; 78 } 79 } 80 return name; 81 } 82 83 static int check_set(unsigned int *val, char *src) 84 { 85 char *last; 86 87 if (strncmp(src, "-", 20) == 0) { 88 *val = SCAN_WILD_CARD; 89 } else { 90 /* 91 * Doesn't check for int overflow 92 */ 93 *val = simple_strtoul(src, &last, 0); 94 if (*last != '\0') 95 return 1; 96 } 97 return 0; 98 } 99 100 static int scsi_scan(struct Scsi_Host *shost, const char *str) 101 { 102 char s1[15], s2[15], s3[15], junk; 103 unsigned int channel, id, lun; 104 int res; 105 106 res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk); 107 if (res != 3) 108 return -EINVAL; 109 if (check_set(&channel, s1)) 110 return -EINVAL; 111 if (check_set(&id, s2)) 112 return -EINVAL; 113 if (check_set(&lun, s3)) 114 return -EINVAL; 115 if (shost->transportt->user_scan) 116 res = shost->transportt->user_scan(shost, channel, id, lun); 117 else 118 res = scsi_scan_host_selected(shost, channel, id, lun, 1); 119 return res; 120 } 121 122 /* 123 * shost_show_function: macro to create an attr function that can be used to 124 * show a non-bit field. 125 */ 126 #define shost_show_function(name, field, format_string) \ 127 static ssize_t \ 128 show_##name (struct device *dev, struct device_attribute *attr, \ 129 char *buf) \ 130 { \ 131 struct Scsi_Host *shost = class_to_shost(dev); \ 132 return snprintf (buf, 20, format_string, shost->field); \ 133 } 134 135 /* 136 * shost_rd_attr: macro to create a function and attribute variable for a 137 * read only field. 138 */ 139 #define shost_rd_attr2(name, field, format_string) \ 140 shost_show_function(name, field, format_string) \ 141 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL); 142 143 #define shost_rd_attr(field, format_string) \ 144 shost_rd_attr2(field, field, format_string) 145 146 /* 147 * Create the actual show/store functions and data structures. 148 */ 149 150 static ssize_t 151 store_scan(struct device *dev, struct device_attribute *attr, 152 const char *buf, size_t count) 153 { 154 struct Scsi_Host *shost = class_to_shost(dev); 155 int res; 156 157 res = scsi_scan(shost, buf); 158 if (res == 0) 159 res = count; 160 return res; 161 }; 162 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan); 163 164 static ssize_t 165 store_shost_state(struct device *dev, struct device_attribute *attr, 166 const char *buf, size_t count) 167 { 168 int i; 169 struct Scsi_Host *shost = class_to_shost(dev); 170 enum scsi_host_state state = 0; 171 172 for (i = 0; i < ARRAY_SIZE(shost_states); i++) { 173 const int len = strlen(shost_states[i].name); 174 if (strncmp(shost_states[i].name, buf, len) == 0 && 175 buf[len] == '\n') { 176 state = shost_states[i].value; 177 break; 178 } 179 } 180 if (!state) 181 return -EINVAL; 182 183 if (scsi_host_set_state(shost, state)) 184 return -EINVAL; 185 return count; 186 } 187 188 static ssize_t 189 show_shost_state(struct device *dev, struct device_attribute *attr, char *buf) 190 { 191 struct Scsi_Host *shost = class_to_shost(dev); 192 const char *name = scsi_host_state_name(shost->shost_state); 193 194 if (!name) 195 return -EINVAL; 196 197 return snprintf(buf, 20, "%s\n", name); 198 } 199 200 /* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */ 201 struct device_attribute dev_attr_hstate = 202 __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state); 203 204 static ssize_t 205 show_shost_mode(unsigned int mode, char *buf) 206 { 207 ssize_t len = 0; 208 209 if (mode & MODE_INITIATOR) 210 len = sprintf(buf, "%s", "Initiator"); 211 212 if (mode & MODE_TARGET) 213 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target"); 214 215 len += sprintf(buf + len, "\n"); 216 217 return len; 218 } 219 220 static ssize_t 221 show_shost_supported_mode(struct device *dev, struct device_attribute *attr, 222 char *buf) 223 { 224 struct Scsi_Host *shost = class_to_shost(dev); 225 unsigned int supported_mode = shost->hostt->supported_mode; 226 227 if (supported_mode == MODE_UNKNOWN) 228 /* by default this should be initiator */ 229 supported_mode = MODE_INITIATOR; 230 231 return show_shost_mode(supported_mode, buf); 232 } 233 234 static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL); 235 236 static ssize_t 237 show_shost_active_mode(struct device *dev, 238 struct device_attribute *attr, char *buf) 239 { 240 struct Scsi_Host *shost = class_to_shost(dev); 241 242 if (shost->active_mode == MODE_UNKNOWN) 243 return snprintf(buf, 20, "unknown\n"); 244 else 245 return show_shost_mode(shost->active_mode, buf); 246 } 247 248 static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL); 249 250 static int check_reset_type(const char *str) 251 { 252 if (sysfs_streq(str, "adapter")) 253 return SCSI_ADAPTER_RESET; 254 else if (sysfs_streq(str, "firmware")) 255 return SCSI_FIRMWARE_RESET; 256 else 257 return 0; 258 } 259 260 static ssize_t 261 store_host_reset(struct device *dev, struct device_attribute *attr, 262 const char *buf, size_t count) 263 { 264 struct Scsi_Host *shost = class_to_shost(dev); 265 struct scsi_host_template *sht = shost->hostt; 266 int ret = -EINVAL; 267 int type; 268 269 type = check_reset_type(buf); 270 if (!type) 271 goto exit_store_host_reset; 272 273 if (sht->host_reset) 274 ret = sht->host_reset(shost, type); 275 276 exit_store_host_reset: 277 if (ret == 0) 278 ret = count; 279 return ret; 280 } 281 282 static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset); 283 284 shost_rd_attr(unique_id, "%u\n"); 285 shost_rd_attr(host_busy, "%hu\n"); 286 shost_rd_attr(cmd_per_lun, "%hd\n"); 287 shost_rd_attr(can_queue, "%hd\n"); 288 shost_rd_attr(sg_tablesize, "%hu\n"); 289 shost_rd_attr(sg_prot_tablesize, "%hu\n"); 290 shost_rd_attr(unchecked_isa_dma, "%d\n"); 291 shost_rd_attr(prot_capabilities, "%u\n"); 292 shost_rd_attr(prot_guard_type, "%hd\n"); 293 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n"); 294 295 static struct attribute *scsi_sysfs_shost_attrs[] = { 296 &dev_attr_unique_id.attr, 297 &dev_attr_host_busy.attr, 298 &dev_attr_cmd_per_lun.attr, 299 &dev_attr_can_queue.attr, 300 &dev_attr_sg_tablesize.attr, 301 &dev_attr_sg_prot_tablesize.attr, 302 &dev_attr_unchecked_isa_dma.attr, 303 &dev_attr_proc_name.attr, 304 &dev_attr_scan.attr, 305 &dev_attr_hstate.attr, 306 &dev_attr_supported_mode.attr, 307 &dev_attr_active_mode.attr, 308 &dev_attr_prot_capabilities.attr, 309 &dev_attr_prot_guard_type.attr, 310 &dev_attr_host_reset.attr, 311 NULL 312 }; 313 314 struct attribute_group scsi_shost_attr_group = { 315 .attrs = scsi_sysfs_shost_attrs, 316 }; 317 318 const struct attribute_group *scsi_sysfs_shost_attr_groups[] = { 319 &scsi_shost_attr_group, 320 NULL 321 }; 322 323 static void scsi_device_cls_release(struct device *class_dev) 324 { 325 struct scsi_device *sdev; 326 327 sdev = class_to_sdev(class_dev); 328 put_device(&sdev->sdev_gendev); 329 } 330 331 static void scsi_device_dev_release_usercontext(struct work_struct *work) 332 { 333 struct scsi_device *sdev; 334 struct device *parent; 335 struct scsi_target *starget; 336 struct list_head *this, *tmp; 337 unsigned long flags; 338 339 sdev = container_of(work, struct scsi_device, ew.work); 340 341 parent = sdev->sdev_gendev.parent; 342 starget = to_scsi_target(parent); 343 344 spin_lock_irqsave(sdev->host->host_lock, flags); 345 starget->reap_ref++; 346 list_del(&sdev->siblings); 347 list_del(&sdev->same_target_siblings); 348 list_del(&sdev->starved_entry); 349 spin_unlock_irqrestore(sdev->host->host_lock, flags); 350 351 cancel_work_sync(&sdev->event_work); 352 353 list_for_each_safe(this, tmp, &sdev->event_list) { 354 struct scsi_event *evt; 355 356 evt = list_entry(this, struct scsi_event, node); 357 list_del(&evt->node); 358 kfree(evt); 359 } 360 361 blk_put_queue(sdev->request_queue); 362 /* NULL queue means the device can't be used */ 363 sdev->request_queue = NULL; 364 365 scsi_target_reap(scsi_target(sdev)); 366 367 kfree(sdev->inquiry); 368 kfree(sdev); 369 370 if (parent) 371 put_device(parent); 372 } 373 374 static void scsi_device_dev_release(struct device *dev) 375 { 376 struct scsi_device *sdp = to_scsi_device(dev); 377 execute_in_process_context(scsi_device_dev_release_usercontext, 378 &sdp->ew); 379 } 380 381 static struct class sdev_class = { 382 .name = "scsi_device", 383 .dev_release = scsi_device_cls_release, 384 }; 385 386 /* all probing is done in the individual ->probe routines */ 387 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv) 388 { 389 struct scsi_device *sdp; 390 391 if (dev->type != &scsi_dev_type) 392 return 0; 393 394 sdp = to_scsi_device(dev); 395 if (sdp->no_uld_attach) 396 return 0; 397 return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0; 398 } 399 400 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env) 401 { 402 struct scsi_device *sdev; 403 404 if (dev->type != &scsi_dev_type) 405 return 0; 406 407 sdev = to_scsi_device(dev); 408 409 add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type); 410 return 0; 411 } 412 413 struct bus_type scsi_bus_type = { 414 .name = "scsi", 415 .match = scsi_bus_match, 416 .uevent = scsi_bus_uevent, 417 #ifdef CONFIG_PM 418 .pm = &scsi_bus_pm_ops, 419 #endif 420 }; 421 EXPORT_SYMBOL_GPL(scsi_bus_type); 422 423 int scsi_sysfs_register(void) 424 { 425 int error; 426 427 error = bus_register(&scsi_bus_type); 428 if (!error) { 429 error = class_register(&sdev_class); 430 if (error) 431 bus_unregister(&scsi_bus_type); 432 } 433 434 return error; 435 } 436 437 void scsi_sysfs_unregister(void) 438 { 439 class_unregister(&sdev_class); 440 bus_unregister(&scsi_bus_type); 441 } 442 443 /* 444 * sdev_show_function: macro to create an attr function that can be used to 445 * show a non-bit field. 446 */ 447 #define sdev_show_function(field, format_string) \ 448 static ssize_t \ 449 sdev_show_##field (struct device *dev, struct device_attribute *attr, \ 450 char *buf) \ 451 { \ 452 struct scsi_device *sdev; \ 453 sdev = to_scsi_device(dev); \ 454 return snprintf (buf, 20, format_string, sdev->field); \ 455 } \ 456 457 /* 458 * sdev_rd_attr: macro to create a function and attribute variable for a 459 * read only field. 460 */ 461 #define sdev_rd_attr(field, format_string) \ 462 sdev_show_function(field, format_string) \ 463 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL); 464 465 466 /* 467 * sdev_rw_attr: create a function and attribute variable for a 468 * read/write field. 469 */ 470 #define sdev_rw_attr(field, format_string) \ 471 sdev_show_function(field, format_string) \ 472 \ 473 static ssize_t \ 474 sdev_store_##field (struct device *dev, struct device_attribute *attr, \ 475 const char *buf, size_t count) \ 476 { \ 477 struct scsi_device *sdev; \ 478 sdev = to_scsi_device(dev); \ 479 sscanf (buf, format_string, &sdev->field); \ 480 return count; \ 481 } \ 482 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); 483 484 /* Currently we don't export bit fields, but we might in future, 485 * so leave this code in */ 486 #if 0 487 /* 488 * sdev_rd_attr: create a function and attribute variable for a 489 * read/write bit field. 490 */ 491 #define sdev_rw_attr_bit(field) \ 492 sdev_show_function(field, "%d\n") \ 493 \ 494 static ssize_t \ 495 sdev_store_##field (struct device *dev, struct device_attribute *attr, \ 496 const char *buf, size_t count) \ 497 { \ 498 int ret; \ 499 struct scsi_device *sdev; \ 500 ret = scsi_sdev_check_buf_bit(buf); \ 501 if (ret >= 0) { \ 502 sdev = to_scsi_device(dev); \ 503 sdev->field = ret; \ 504 ret = count; \ 505 } \ 506 return ret; \ 507 } \ 508 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); 509 510 /* 511 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1", 512 * else return -EINVAL. 513 */ 514 static int scsi_sdev_check_buf_bit(const char *buf) 515 { 516 if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) { 517 if (buf[0] == '1') 518 return 1; 519 else if (buf[0] == '0') 520 return 0; 521 else 522 return -EINVAL; 523 } else 524 return -EINVAL; 525 } 526 #endif 527 /* 528 * Create the actual show/store functions and data structures. 529 */ 530 sdev_rd_attr (device_blocked, "%d\n"); 531 sdev_rd_attr (queue_depth, "%d\n"); 532 sdev_rd_attr (type, "%d\n"); 533 sdev_rd_attr (scsi_level, "%d\n"); 534 sdev_rd_attr (vendor, "%.8s\n"); 535 sdev_rd_attr (model, "%.16s\n"); 536 sdev_rd_attr (rev, "%.4s\n"); 537 538 /* 539 * TODO: can we make these symlinks to the block layer ones? 540 */ 541 static ssize_t 542 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf) 543 { 544 struct scsi_device *sdev; 545 sdev = to_scsi_device(dev); 546 return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ); 547 } 548 549 static ssize_t 550 sdev_store_timeout (struct device *dev, struct device_attribute *attr, 551 const char *buf, size_t count) 552 { 553 struct scsi_device *sdev; 554 int timeout; 555 sdev = to_scsi_device(dev); 556 sscanf (buf, "%d\n", &timeout); 557 blk_queue_rq_timeout(sdev->request_queue, timeout * HZ); 558 return count; 559 } 560 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout); 561 562 static ssize_t 563 store_rescan_field (struct device *dev, struct device_attribute *attr, 564 const char *buf, size_t count) 565 { 566 scsi_rescan_device(dev); 567 return count; 568 } 569 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field); 570 571 static void sdev_store_delete_callback(struct device *dev) 572 { 573 scsi_remove_device(to_scsi_device(dev)); 574 } 575 576 static ssize_t 577 sdev_store_delete(struct device *dev, struct device_attribute *attr, 578 const char *buf, size_t count) 579 { 580 int rc; 581 582 /* An attribute cannot be unregistered by one of its own methods, 583 * so we have to use this roundabout approach. 584 */ 585 rc = device_schedule_callback(dev, sdev_store_delete_callback); 586 if (rc) 587 count = rc; 588 return count; 589 }; 590 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete); 591 592 static ssize_t 593 store_state_field(struct device *dev, struct device_attribute *attr, 594 const char *buf, size_t count) 595 { 596 int i; 597 struct scsi_device *sdev = to_scsi_device(dev); 598 enum scsi_device_state state = 0; 599 600 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) { 601 const int len = strlen(sdev_states[i].name); 602 if (strncmp(sdev_states[i].name, buf, len) == 0 && 603 buf[len] == '\n') { 604 state = sdev_states[i].value; 605 break; 606 } 607 } 608 if (!state) 609 return -EINVAL; 610 611 if (scsi_device_set_state(sdev, state)) 612 return -EINVAL; 613 return count; 614 } 615 616 static ssize_t 617 show_state_field(struct device *dev, struct device_attribute *attr, char *buf) 618 { 619 struct scsi_device *sdev = to_scsi_device(dev); 620 const char *name = scsi_device_state_name(sdev->sdev_state); 621 622 if (!name) 623 return -EINVAL; 624 625 return snprintf(buf, 20, "%s\n", name); 626 } 627 628 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field); 629 630 static ssize_t 631 show_queue_type_field(struct device *dev, struct device_attribute *attr, 632 char *buf) 633 { 634 struct scsi_device *sdev = to_scsi_device(dev); 635 const char *name = "none"; 636 637 if (sdev->ordered_tags) 638 name = "ordered"; 639 else if (sdev->simple_tags) 640 name = "simple"; 641 642 return snprintf(buf, 20, "%s\n", name); 643 } 644 645 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL); 646 647 static ssize_t 648 show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf) 649 { 650 return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8); 651 } 652 653 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL); 654 655 #define show_sdev_iostat(field) \ 656 static ssize_t \ 657 show_iostat_##field(struct device *dev, struct device_attribute *attr, \ 658 char *buf) \ 659 { \ 660 struct scsi_device *sdev = to_scsi_device(dev); \ 661 unsigned long long count = atomic_read(&sdev->field); \ 662 return snprintf(buf, 20, "0x%llx\n", count); \ 663 } \ 664 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL) 665 666 show_sdev_iostat(iorequest_cnt); 667 show_sdev_iostat(iodone_cnt); 668 show_sdev_iostat(ioerr_cnt); 669 670 static ssize_t 671 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf) 672 { 673 struct scsi_device *sdev; 674 sdev = to_scsi_device(dev); 675 return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type); 676 } 677 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL); 678 679 #define DECLARE_EVT_SHOW(name, Cap_name) \ 680 static ssize_t \ 681 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \ 682 char *buf) \ 683 { \ 684 struct scsi_device *sdev = to_scsi_device(dev); \ 685 int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\ 686 return snprintf(buf, 20, "%d\n", val); \ 687 } 688 689 #define DECLARE_EVT_STORE(name, Cap_name) \ 690 static ssize_t \ 691 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\ 692 const char *buf, size_t count) \ 693 { \ 694 struct scsi_device *sdev = to_scsi_device(dev); \ 695 int val = simple_strtoul(buf, NULL, 0); \ 696 if (val == 0) \ 697 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \ 698 else if (val == 1) \ 699 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \ 700 else \ 701 return -EINVAL; \ 702 return count; \ 703 } 704 705 #define DECLARE_EVT(name, Cap_name) \ 706 DECLARE_EVT_SHOW(name, Cap_name) \ 707 DECLARE_EVT_STORE(name, Cap_name) \ 708 static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name, \ 709 sdev_store_evt_##name); 710 #define REF_EVT(name) &dev_attr_evt_##name.attr 711 712 DECLARE_EVT(media_change, MEDIA_CHANGE) 713 714 /* Default template for device attributes. May NOT be modified */ 715 static struct attribute *scsi_sdev_attrs[] = { 716 &dev_attr_device_blocked.attr, 717 &dev_attr_type.attr, 718 &dev_attr_scsi_level.attr, 719 &dev_attr_vendor.attr, 720 &dev_attr_model.attr, 721 &dev_attr_rev.attr, 722 &dev_attr_rescan.attr, 723 &dev_attr_delete.attr, 724 &dev_attr_state.attr, 725 &dev_attr_timeout.attr, 726 &dev_attr_iocounterbits.attr, 727 &dev_attr_iorequest_cnt.attr, 728 &dev_attr_iodone_cnt.attr, 729 &dev_attr_ioerr_cnt.attr, 730 &dev_attr_modalias.attr, 731 REF_EVT(media_change), 732 NULL 733 }; 734 735 static struct attribute_group scsi_sdev_attr_group = { 736 .attrs = scsi_sdev_attrs, 737 }; 738 739 static const struct attribute_group *scsi_sdev_attr_groups[] = { 740 &scsi_sdev_attr_group, 741 NULL 742 }; 743 744 static ssize_t 745 sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr, 746 const char *buf, size_t count) 747 { 748 int depth, retval; 749 struct scsi_device *sdev = to_scsi_device(dev); 750 struct scsi_host_template *sht = sdev->host->hostt; 751 752 if (!sht->change_queue_depth) 753 return -EINVAL; 754 755 depth = simple_strtoul(buf, NULL, 0); 756 757 if (depth < 1) 758 return -EINVAL; 759 760 retval = sht->change_queue_depth(sdev, depth, 761 SCSI_QDEPTH_DEFAULT); 762 if (retval < 0) 763 return retval; 764 765 sdev->max_queue_depth = sdev->queue_depth; 766 767 return count; 768 } 769 770 static struct device_attribute sdev_attr_queue_depth_rw = 771 __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth, 772 sdev_store_queue_depth_rw); 773 774 static ssize_t 775 sdev_show_queue_ramp_up_period(struct device *dev, 776 struct device_attribute *attr, 777 char *buf) 778 { 779 struct scsi_device *sdev; 780 sdev = to_scsi_device(dev); 781 return snprintf(buf, 20, "%u\n", 782 jiffies_to_msecs(sdev->queue_ramp_up_period)); 783 } 784 785 static ssize_t 786 sdev_store_queue_ramp_up_period(struct device *dev, 787 struct device_attribute *attr, 788 const char *buf, size_t count) 789 { 790 struct scsi_device *sdev = to_scsi_device(dev); 791 unsigned long period; 792 793 if (strict_strtoul(buf, 10, &period)) 794 return -EINVAL; 795 796 sdev->queue_ramp_up_period = msecs_to_jiffies(period); 797 return period; 798 } 799 800 static struct device_attribute sdev_attr_queue_ramp_up_period = 801 __ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR, 802 sdev_show_queue_ramp_up_period, 803 sdev_store_queue_ramp_up_period); 804 805 static ssize_t 806 sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr, 807 const char *buf, size_t count) 808 { 809 struct scsi_device *sdev = to_scsi_device(dev); 810 struct scsi_host_template *sht = sdev->host->hostt; 811 int tag_type = 0, retval; 812 int prev_tag_type = scsi_get_tag_type(sdev); 813 814 if (!sdev->tagged_supported || !sht->change_queue_type) 815 return -EINVAL; 816 817 if (strncmp(buf, "ordered", 7) == 0) 818 tag_type = MSG_ORDERED_TAG; 819 else if (strncmp(buf, "simple", 6) == 0) 820 tag_type = MSG_SIMPLE_TAG; 821 else if (strncmp(buf, "none", 4) != 0) 822 return -EINVAL; 823 824 if (tag_type == prev_tag_type) 825 return count; 826 827 retval = sht->change_queue_type(sdev, tag_type); 828 if (retval < 0) 829 return retval; 830 831 return count; 832 } 833 834 static int scsi_target_add(struct scsi_target *starget) 835 { 836 int error; 837 838 if (starget->state != STARGET_CREATED) 839 return 0; 840 841 error = device_add(&starget->dev); 842 if (error) { 843 dev_err(&starget->dev, "target device_add failed, error %d\n", error); 844 return error; 845 } 846 transport_add_device(&starget->dev); 847 starget->state = STARGET_RUNNING; 848 849 pm_runtime_set_active(&starget->dev); 850 pm_runtime_enable(&starget->dev); 851 device_enable_async_suspend(&starget->dev); 852 853 return 0; 854 } 855 856 static struct device_attribute sdev_attr_queue_type_rw = 857 __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field, 858 sdev_store_queue_type_rw); 859 860 /** 861 * scsi_sysfs_add_sdev - add scsi device to sysfs 862 * @sdev: scsi_device to add 863 * 864 * Return value: 865 * 0 on Success / non-zero on Failure 866 **/ 867 int scsi_sysfs_add_sdev(struct scsi_device *sdev) 868 { 869 int error, i; 870 struct request_queue *rq = sdev->request_queue; 871 struct scsi_target *starget = sdev->sdev_target; 872 873 error = scsi_device_set_state(sdev, SDEV_RUNNING); 874 if (error) 875 return error; 876 877 error = scsi_target_add(starget); 878 if (error) 879 return error; 880 881 transport_configure_device(&starget->dev); 882 883 device_enable_async_suspend(&sdev->sdev_gendev); 884 scsi_autopm_get_target(starget); 885 pm_runtime_set_active(&sdev->sdev_gendev); 886 pm_runtime_forbid(&sdev->sdev_gendev); 887 pm_runtime_enable(&sdev->sdev_gendev); 888 scsi_autopm_put_target(starget); 889 890 /* The following call will keep sdev active indefinitely, until 891 * its driver does a corresponding scsi_autopm_pm_device(). Only 892 * drivers supporting autosuspend will do this. 893 */ 894 scsi_autopm_get_device(sdev); 895 896 error = device_add(&sdev->sdev_gendev); 897 if (error) { 898 sdev_printk(KERN_INFO, sdev, 899 "failed to add device: %d\n", error); 900 return error; 901 } 902 device_enable_async_suspend(&sdev->sdev_dev); 903 error = device_add(&sdev->sdev_dev); 904 if (error) { 905 sdev_printk(KERN_INFO, sdev, 906 "failed to add class device: %d\n", error); 907 device_del(&sdev->sdev_gendev); 908 return error; 909 } 910 transport_add_device(&sdev->sdev_gendev); 911 sdev->is_visible = 1; 912 913 /* create queue files, which may be writable, depending on the host */ 914 if (sdev->host->hostt->change_queue_depth) { 915 error = device_create_file(&sdev->sdev_gendev, 916 &sdev_attr_queue_depth_rw); 917 error = device_create_file(&sdev->sdev_gendev, 918 &sdev_attr_queue_ramp_up_period); 919 } 920 else 921 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth); 922 if (error) 923 return error; 924 925 if (sdev->host->hostt->change_queue_type) 926 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw); 927 else 928 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type); 929 if (error) 930 return error; 931 932 error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL); 933 934 if (error) 935 /* we're treating error on bsg register as non-fatal, 936 * so pretend nothing went wrong */ 937 sdev_printk(KERN_INFO, sdev, 938 "Failed to register bsg queue, errno=%d\n", error); 939 940 /* add additional host specific attributes */ 941 if (sdev->host->hostt->sdev_attrs) { 942 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) { 943 error = device_create_file(&sdev->sdev_gendev, 944 sdev->host->hostt->sdev_attrs[i]); 945 if (error) 946 return error; 947 } 948 } 949 950 return error; 951 } 952 953 void __scsi_remove_device(struct scsi_device *sdev) 954 { 955 struct device *dev = &sdev->sdev_gendev; 956 957 if (sdev->is_visible) { 958 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0) 959 return; 960 961 bsg_unregister_queue(sdev->request_queue); 962 device_unregister(&sdev->sdev_dev); 963 transport_remove_device(dev); 964 device_del(dev); 965 } else 966 put_device(&sdev->sdev_dev); 967 968 /* 969 * Stop accepting new requests and wait until all queuecommand() and 970 * scsi_run_queue() invocations have finished before tearing down the 971 * device. 972 */ 973 scsi_device_set_state(sdev, SDEV_DEL); 974 blk_cleanup_queue(sdev->request_queue); 975 cancel_work_sync(&sdev->requeue_work); 976 977 if (sdev->host->hostt->slave_destroy) 978 sdev->host->hostt->slave_destroy(sdev); 979 transport_destroy_device(dev); 980 981 put_device(dev); 982 } 983 984 /** 985 * scsi_remove_device - unregister a device from the scsi bus 986 * @sdev: scsi_device to unregister 987 **/ 988 void scsi_remove_device(struct scsi_device *sdev) 989 { 990 struct Scsi_Host *shost = sdev->host; 991 992 mutex_lock(&shost->scan_mutex); 993 __scsi_remove_device(sdev); 994 mutex_unlock(&shost->scan_mutex); 995 } 996 EXPORT_SYMBOL(scsi_remove_device); 997 998 static void __scsi_remove_target(struct scsi_target *starget) 999 { 1000 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 1001 unsigned long flags; 1002 struct scsi_device *sdev; 1003 1004 spin_lock_irqsave(shost->host_lock, flags); 1005 restart: 1006 list_for_each_entry(sdev, &shost->__devices, siblings) { 1007 if (sdev->channel != starget->channel || 1008 sdev->id != starget->id || 1009 scsi_device_get(sdev)) 1010 continue; 1011 spin_unlock_irqrestore(shost->host_lock, flags); 1012 scsi_remove_device(sdev); 1013 scsi_device_put(sdev); 1014 spin_lock_irqsave(shost->host_lock, flags); 1015 goto restart; 1016 } 1017 spin_unlock_irqrestore(shost->host_lock, flags); 1018 } 1019 1020 /** 1021 * scsi_remove_target - try to remove a target and all its devices 1022 * @dev: generic starget or parent of generic stargets to be removed 1023 * 1024 * Note: This is slightly racy. It is possible that if the user 1025 * requests the addition of another device then the target won't be 1026 * removed. 1027 */ 1028 void scsi_remove_target(struct device *dev) 1029 { 1030 struct Scsi_Host *shost = dev_to_shost(dev->parent); 1031 struct scsi_target *starget, *last = NULL; 1032 unsigned long flags; 1033 1034 /* remove targets being careful to lookup next entry before 1035 * deleting the last 1036 */ 1037 spin_lock_irqsave(shost->host_lock, flags); 1038 list_for_each_entry(starget, &shost->__targets, siblings) { 1039 if (starget->state == STARGET_DEL) 1040 continue; 1041 if (starget->dev.parent == dev || &starget->dev == dev) { 1042 /* assuming new targets arrive at the end */ 1043 starget->reap_ref++; 1044 spin_unlock_irqrestore(shost->host_lock, flags); 1045 if (last) 1046 scsi_target_reap(last); 1047 last = starget; 1048 __scsi_remove_target(starget); 1049 spin_lock_irqsave(shost->host_lock, flags); 1050 } 1051 } 1052 spin_unlock_irqrestore(shost->host_lock, flags); 1053 1054 if (last) 1055 scsi_target_reap(last); 1056 } 1057 EXPORT_SYMBOL(scsi_remove_target); 1058 1059 int scsi_register_driver(struct device_driver *drv) 1060 { 1061 drv->bus = &scsi_bus_type; 1062 1063 return driver_register(drv); 1064 } 1065 EXPORT_SYMBOL(scsi_register_driver); 1066 1067 int scsi_register_interface(struct class_interface *intf) 1068 { 1069 intf->class = &sdev_class; 1070 1071 return class_interface_register(intf); 1072 } 1073 EXPORT_SYMBOL(scsi_register_interface); 1074 1075 /** 1076 * scsi_sysfs_add_host - add scsi host to subsystem 1077 * @shost: scsi host struct to add to subsystem 1078 **/ 1079 int scsi_sysfs_add_host(struct Scsi_Host *shost) 1080 { 1081 int error, i; 1082 1083 /* add host specific attributes */ 1084 if (shost->hostt->shost_attrs) { 1085 for (i = 0; shost->hostt->shost_attrs[i]; i++) { 1086 error = device_create_file(&shost->shost_dev, 1087 shost->hostt->shost_attrs[i]); 1088 if (error) 1089 return error; 1090 } 1091 } 1092 1093 transport_register_device(&shost->shost_gendev); 1094 transport_configure_device(&shost->shost_gendev); 1095 return 0; 1096 } 1097 1098 static struct device_type scsi_dev_type = { 1099 .name = "scsi_device", 1100 .release = scsi_device_dev_release, 1101 .groups = scsi_sdev_attr_groups, 1102 }; 1103 1104 void scsi_sysfs_device_initialize(struct scsi_device *sdev) 1105 { 1106 unsigned long flags; 1107 struct Scsi_Host *shost = sdev->host; 1108 struct scsi_target *starget = sdev->sdev_target; 1109 1110 device_initialize(&sdev->sdev_gendev); 1111 sdev->sdev_gendev.bus = &scsi_bus_type; 1112 sdev->sdev_gendev.type = &scsi_dev_type; 1113 dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%d", 1114 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun); 1115 1116 device_initialize(&sdev->sdev_dev); 1117 sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev); 1118 sdev->sdev_dev.class = &sdev_class; 1119 dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%d", 1120 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun); 1121 sdev->scsi_level = starget->scsi_level; 1122 transport_setup_device(&sdev->sdev_gendev); 1123 spin_lock_irqsave(shost->host_lock, flags); 1124 list_add_tail(&sdev->same_target_siblings, &starget->devices); 1125 list_add_tail(&sdev->siblings, &shost->__devices); 1126 spin_unlock_irqrestore(shost->host_lock, flags); 1127 } 1128 1129 int scsi_is_sdev_device(const struct device *dev) 1130 { 1131 return dev->type == &scsi_dev_type; 1132 } 1133 EXPORT_SYMBOL(scsi_is_sdev_device); 1134 1135 /* A blank transport template that is used in drivers that don't 1136 * yet implement Transport Attributes */ 1137 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, }; 1138