1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * scsi_sysfs.c 4 * 5 * SCSI sysfs interface routines. 6 * 7 * Created to pull SCSI mid layer sysfs routines into one file. 8 */ 9 10#include <linux/module.h> 11#include <linux/slab.h> 12#include <linux/init.h> 13#include <linux/blkdev.h> 14#include <linux/device.h> 15#include <linux/pm_runtime.h> 16 17#include <scsi/scsi.h> 18#include <scsi/scsi_device.h> 19#include <scsi/scsi_host.h> 20#include <scsi/scsi_tcq.h> 21#include <scsi/scsi_dh.h> 22#include <scsi/scsi_transport.h> 23#include <scsi/scsi_driver.h> 24#include <scsi/scsi_devinfo.h> 25 26#include "scsi_priv.h" 27#include "scsi_logging.h" 28 29static struct device_type scsi_dev_type; 30 31static const struct { 32 enum scsi_device_state value; 33 char *name; 34} sdev_states[] = { 35 { SDEV_CREATED, "created" }, 36 { SDEV_RUNNING, "running" }, 37 { SDEV_CANCEL, "cancel" }, 38 { SDEV_DEL, "deleted" }, 39 { SDEV_QUIESCE, "quiesce" }, 40 { SDEV_OFFLINE, "offline" }, 41 { SDEV_TRANSPORT_OFFLINE, "transport-offline" }, 42 { SDEV_BLOCK, "blocked" }, 43 { SDEV_CREATED_BLOCK, "created-blocked" }, 44}; 45 46const char *scsi_device_state_name(enum scsi_device_state state) 47{ 48 int i; 49 char *name = NULL; 50 51 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) { 52 if (sdev_states[i].value == state) { 53 name = sdev_states[i].name; 54 break; 55 } 56 } 57 return name; 58} 59 60static const struct { 61 enum scsi_host_state value; 62 char *name; 63} shost_states[] = { 64 { SHOST_CREATED, "created" }, 65 { SHOST_RUNNING, "running" }, 66 { SHOST_CANCEL, "cancel" }, 67 { SHOST_DEL, "deleted" }, 68 { SHOST_RECOVERY, "recovery" }, 69 { SHOST_CANCEL_RECOVERY, "cancel/recovery" }, 70 { SHOST_DEL_RECOVERY, "deleted/recovery", }, 71}; 72const char *scsi_host_state_name(enum scsi_host_state state) 73{ 74 int i; 75 char *name = NULL; 76 77 for (i = 0; i < ARRAY_SIZE(shost_states); i++) { 78 if (shost_states[i].value == state) { 79 name = shost_states[i].name; 80 break; 81 } 82 } 83 return name; 84} 85 86#ifdef CONFIG_SCSI_DH 87static const struct { 88 unsigned char value; 89 char *name; 90} sdev_access_states[] = { 91 { SCSI_ACCESS_STATE_OPTIMAL, "active/optimized" }, 92 { SCSI_ACCESS_STATE_ACTIVE, "active/non-optimized" }, 93 { SCSI_ACCESS_STATE_STANDBY, "standby" }, 94 { SCSI_ACCESS_STATE_UNAVAILABLE, "unavailable" }, 95 { SCSI_ACCESS_STATE_LBA, "lba-dependent" }, 96 { SCSI_ACCESS_STATE_OFFLINE, "offline" }, 97 { SCSI_ACCESS_STATE_TRANSITIONING, "transitioning" }, 98}; 99 100static const char *scsi_access_state_name(unsigned char state) 101{ 102 int i; 103 char *name = NULL; 104 105 for (i = 0; i < ARRAY_SIZE(sdev_access_states); i++) { 106 if (sdev_access_states[i].value == state) { 107 name = sdev_access_states[i].name; 108 break; 109 } 110 } 111 return name; 112} 113#endif 114 115static int check_set(unsigned long long *val, char *src) 116{ 117 char *last; 118 119 if (strcmp(src, "-") == 0) { 120 *val = SCAN_WILD_CARD; 121 } else { 122 /* 123 * Doesn't check for int overflow 124 */ 125 *val = simple_strtoull(src, &last, 0); 126 if (*last != '\0') 127 return 1; 128 } 129 return 0; 130} 131 132static int scsi_scan(struct Scsi_Host *shost, const char *str) 133{ 134 char s1[15], s2[15], s3[17], junk; 135 unsigned long long channel, id, lun; 136 int res; 137 138 res = sscanf(str, "%10s %10s %16s %c", s1, s2, s3, &junk); 139 if (res != 3) 140 return -EINVAL; 141 if (check_set(&channel, s1)) 142 return -EINVAL; 143 if (check_set(&id, s2)) 144 return -EINVAL; 145 if (check_set(&lun, s3)) 146 return -EINVAL; 147 if (shost->transportt->user_scan) 148 res = shost->transportt->user_scan(shost, channel, id, lun); 149 else 150 res = scsi_scan_host_selected(shost, channel, id, lun, 151 SCSI_SCAN_MANUAL); 152 return res; 153} 154 155/* 156 * shost_show_function: macro to create an attr function that can be used to 157 * show a non-bit field. 158 */ 159#define shost_show_function(name, field, format_string) \ 160static ssize_t \ 161show_##name (struct device *dev, struct device_attribute *attr, \ 162 char *buf) \ 163{ \ 164 struct Scsi_Host *shost = class_to_shost(dev); \ 165 return snprintf (buf, 20, format_string, shost->field); \ 166} 167 168/* 169 * shost_rd_attr: macro to create a function and attribute variable for a 170 * read only field. 171 */ 172#define shost_rd_attr2(name, field, format_string) \ 173 shost_show_function(name, field, format_string) \ 174static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL); 175 176#define shost_rd_attr(field, format_string) \ 177shost_rd_attr2(field, field, format_string) 178 179/* 180 * Create the actual show/store functions and data structures. 181 */ 182 183static ssize_t 184store_scan(struct device *dev, struct device_attribute *attr, 185 const char *buf, size_t count) 186{ 187 struct Scsi_Host *shost = class_to_shost(dev); 188 int res; 189 190 res = scsi_scan(shost, buf); 191 if (res == 0) 192 res = count; 193 return res; 194}; 195static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan); 196 197static ssize_t 198store_shost_state(struct device *dev, struct device_attribute *attr, 199 const char *buf, size_t count) 200{ 201 int i; 202 struct Scsi_Host *shost = class_to_shost(dev); 203 enum scsi_host_state state = 0; 204 205 for (i = 0; i < ARRAY_SIZE(shost_states); i++) { 206 const int len = strlen(shost_states[i].name); 207 if (strncmp(shost_states[i].name, buf, len) == 0 && 208 buf[len] == '\n') { 209 state = shost_states[i].value; 210 break; 211 } 212 } 213 if (!state) 214 return -EINVAL; 215 216 if (scsi_host_set_state(shost, state)) 217 return -EINVAL; 218 return count; 219} 220 221static ssize_t 222show_shost_state(struct device *dev, struct device_attribute *attr, char *buf) 223{ 224 struct Scsi_Host *shost = class_to_shost(dev); 225 const char *name = scsi_host_state_name(shost->shost_state); 226 227 if (!name) 228 return -EINVAL; 229 230 return snprintf(buf, 20, "%s\n", name); 231} 232 233/* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */ 234static struct device_attribute dev_attr_hstate = 235 __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state); 236 237static ssize_t 238show_shost_mode(unsigned int mode, char *buf) 239{ 240 ssize_t len = 0; 241 242 if (mode & MODE_INITIATOR) 243 len = sprintf(buf, "%s", "Initiator"); 244 245 if (mode & MODE_TARGET) 246 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target"); 247 248 len += sprintf(buf + len, "\n"); 249 250 return len; 251} 252 253static ssize_t 254show_shost_supported_mode(struct device *dev, struct device_attribute *attr, 255 char *buf) 256{ 257 struct Scsi_Host *shost = class_to_shost(dev); 258 unsigned int supported_mode = shost->hostt->supported_mode; 259 260 if (supported_mode == MODE_UNKNOWN) 261 /* by default this should be initiator */ 262 supported_mode = MODE_INITIATOR; 263 264 return show_shost_mode(supported_mode, buf); 265} 266 267static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL); 268 269static ssize_t 270show_shost_active_mode(struct device *dev, 271 struct device_attribute *attr, char *buf) 272{ 273 struct Scsi_Host *shost = class_to_shost(dev); 274 275 if (shost->active_mode == MODE_UNKNOWN) 276 return snprintf(buf, 20, "unknown\n"); 277 else 278 return show_shost_mode(shost->active_mode, buf); 279} 280 281static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL); 282 283static int check_reset_type(const char *str) 284{ 285 if (sysfs_streq(str, "adapter")) 286 return SCSI_ADAPTER_RESET; 287 else if (sysfs_streq(str, "firmware")) 288 return SCSI_FIRMWARE_RESET; 289 else 290 return 0; 291} 292 293static ssize_t 294store_host_reset(struct device *dev, struct device_attribute *attr, 295 const char *buf, size_t count) 296{ 297 struct Scsi_Host *shost = class_to_shost(dev); 298 struct scsi_host_template *sht = shost->hostt; 299 int ret = -EINVAL; 300 int type; 301 302 type = check_reset_type(buf); 303 if (!type) 304 goto exit_store_host_reset; 305 306 if (sht->host_reset) 307 ret = sht->host_reset(shost, type); 308 else 309 ret = -EOPNOTSUPP; 310 311exit_store_host_reset: 312 if (ret == 0) 313 ret = count; 314 return ret; 315} 316 317static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset); 318 319static ssize_t 320show_shost_eh_deadline(struct device *dev, 321 struct device_attribute *attr, char *buf) 322{ 323 struct Scsi_Host *shost = class_to_shost(dev); 324 325 if (shost->eh_deadline == -1) 326 return snprintf(buf, strlen("off") + 2, "off\n"); 327 return sprintf(buf, "%u\n", shost->eh_deadline / HZ); 328} 329 330static ssize_t 331store_shost_eh_deadline(struct device *dev, struct device_attribute *attr, 332 const char *buf, size_t count) 333{ 334 struct Scsi_Host *shost = class_to_shost(dev); 335 int ret = -EINVAL; 336 unsigned long deadline, flags; 337 338 if (shost->transportt && 339 (shost->transportt->eh_strategy_handler || 340 !shost->hostt->eh_host_reset_handler)) 341 return ret; 342 343 if (!strncmp(buf, "off", strlen("off"))) 344 deadline = -1; 345 else { 346 ret = kstrtoul(buf, 10, &deadline); 347 if (ret) 348 return ret; 349 if (deadline * HZ > UINT_MAX) 350 return -EINVAL; 351 } 352 353 spin_lock_irqsave(shost->host_lock, flags); 354 if (scsi_host_in_recovery(shost)) 355 ret = -EBUSY; 356 else { 357 if (deadline == -1) 358 shost->eh_deadline = -1; 359 else 360 shost->eh_deadline = deadline * HZ; 361 362 ret = count; 363 } 364 spin_unlock_irqrestore(shost->host_lock, flags); 365 366 return ret; 367} 368 369static DEVICE_ATTR(eh_deadline, S_IRUGO | S_IWUSR, show_shost_eh_deadline, store_shost_eh_deadline); 370 371shost_rd_attr(unique_id, "%u\n"); 372shost_rd_attr(cmd_per_lun, "%hd\n"); 373shost_rd_attr(can_queue, "%hd\n"); 374shost_rd_attr(sg_tablesize, "%hu\n"); 375shost_rd_attr(sg_prot_tablesize, "%hu\n"); 376shost_rd_attr(unchecked_isa_dma, "%d\n"); 377shost_rd_attr(prot_capabilities, "%u\n"); 378shost_rd_attr(prot_guard_type, "%hd\n"); 379shost_rd_attr2(proc_name, hostt->proc_name, "%s\n"); 380 381static ssize_t 382show_host_busy(struct device *dev, struct device_attribute *attr, char *buf) 383{ 384 struct Scsi_Host *shost = class_to_shost(dev); 385 return snprintf(buf, 20, "%d\n", scsi_host_busy(shost)); 386} 387static DEVICE_ATTR(host_busy, S_IRUGO, show_host_busy, NULL); 388 389static ssize_t 390show_use_blk_mq(struct device *dev, struct device_attribute *attr, char *buf) 391{ 392 return sprintf(buf, "1\n"); 393} 394static DEVICE_ATTR(use_blk_mq, S_IRUGO, show_use_blk_mq, NULL); 395 396static ssize_t 397show_nr_hw_queues(struct device *dev, struct device_attribute *attr, char *buf) 398{ 399 struct Scsi_Host *shost = class_to_shost(dev); 400 struct blk_mq_tag_set *tag_set = &shost->tag_set; 401 402 return snprintf(buf, 20, "%d\n", tag_set->nr_hw_queues); 403} 404static DEVICE_ATTR(nr_hw_queues, S_IRUGO, show_nr_hw_queues, NULL); 405 406static struct attribute *scsi_sysfs_shost_attrs[] = { 407 &dev_attr_use_blk_mq.attr, 408 &dev_attr_unique_id.attr, 409 &dev_attr_host_busy.attr, 410 &dev_attr_cmd_per_lun.attr, 411 &dev_attr_can_queue.attr, 412 &dev_attr_sg_tablesize.attr, 413 &dev_attr_sg_prot_tablesize.attr, 414 &dev_attr_unchecked_isa_dma.attr, 415 &dev_attr_proc_name.attr, 416 &dev_attr_scan.attr, 417 &dev_attr_hstate.attr, 418 &dev_attr_supported_mode.attr, 419 &dev_attr_active_mode.attr, 420 &dev_attr_prot_capabilities.attr, 421 &dev_attr_prot_guard_type.attr, 422 &dev_attr_host_reset.attr, 423 &dev_attr_eh_deadline.attr, 424 &dev_attr_nr_hw_queues.attr, 425 NULL 426}; 427 428static struct attribute_group scsi_shost_attr_group = { 429 .attrs = scsi_sysfs_shost_attrs, 430}; 431 432const struct attribute_group *scsi_sysfs_shost_attr_groups[] = { 433 &scsi_shost_attr_group, 434 NULL 435}; 436 437static void scsi_device_cls_release(struct device *class_dev) 438{ 439 struct scsi_device *sdev; 440 441 sdev = class_to_sdev(class_dev); 442 put_device(&sdev->sdev_gendev); 443} 444 445static void scsi_device_dev_release_usercontext(struct work_struct *work) 446{ 447 struct scsi_device *sdev; 448 struct device *parent; 449 struct list_head *this, *tmp; 450 struct scsi_vpd *vpd_pg80 = NULL, *vpd_pg83 = NULL; 451 struct scsi_vpd *vpd_pg0 = NULL, *vpd_pg89 = NULL; 452 unsigned long flags; 453 struct module *mod; 454 455 sdev = container_of(work, struct scsi_device, ew.work); 456 457 mod = sdev->host->hostt->module; 458 459 scsi_dh_release_device(sdev); 460 461 parent = sdev->sdev_gendev.parent; 462 463 spin_lock_irqsave(sdev->host->host_lock, flags); 464 list_del(&sdev->siblings); 465 list_del(&sdev->same_target_siblings); 466 list_del(&sdev->starved_entry); 467 spin_unlock_irqrestore(sdev->host->host_lock, flags); 468 469 cancel_work_sync(&sdev->event_work); 470 471 list_for_each_safe(this, tmp, &sdev->event_list) { 472 struct scsi_event *evt; 473 474 evt = list_entry(this, struct scsi_event, node); 475 list_del(&evt->node); 476 kfree(evt); 477 } 478 479 blk_put_queue(sdev->request_queue); 480 /* NULL queue means the device can't be used */ 481 sdev->request_queue = NULL; 482 483 mutex_lock(&sdev->inquiry_mutex); 484 vpd_pg0 = rcu_replace_pointer(sdev->vpd_pg0, vpd_pg0, 485 lockdep_is_held(&sdev->inquiry_mutex)); 486 vpd_pg80 = rcu_replace_pointer(sdev->vpd_pg80, vpd_pg80, 487 lockdep_is_held(&sdev->inquiry_mutex)); 488 vpd_pg83 = rcu_replace_pointer(sdev->vpd_pg83, vpd_pg83, 489 lockdep_is_held(&sdev->inquiry_mutex)); 490 vpd_pg89 = rcu_replace_pointer(sdev->vpd_pg89, vpd_pg89, 491 lockdep_is_held(&sdev->inquiry_mutex)); 492 mutex_unlock(&sdev->inquiry_mutex); 493 494 if (vpd_pg0) 495 kfree_rcu(vpd_pg0, rcu); 496 if (vpd_pg83) 497 kfree_rcu(vpd_pg83, rcu); 498 if (vpd_pg80) 499 kfree_rcu(vpd_pg80, rcu); 500 if (vpd_pg89) 501 kfree_rcu(vpd_pg89, rcu); 502 kfree(sdev->inquiry); 503 kfree(sdev); 504 505 if (parent) 506 put_device(parent); 507 module_put(mod); 508} 509 510static void scsi_device_dev_release(struct device *dev) 511{ 512 struct scsi_device *sdp = to_scsi_device(dev); 513 514 /* Set module pointer as NULL in case of module unloading */ 515 if (!try_module_get(sdp->host->hostt->module)) 516 sdp->host->hostt->module = NULL; 517 518 execute_in_process_context(scsi_device_dev_release_usercontext, 519 &sdp->ew); 520} 521 522static struct class sdev_class = { 523 .name = "scsi_device", 524 .dev_release = scsi_device_cls_release, 525}; 526 527/* all probing is done in the individual ->probe routines */ 528static int scsi_bus_match(struct device *dev, struct device_driver *gendrv) 529{ 530 struct scsi_device *sdp; 531 532 if (dev->type != &scsi_dev_type) 533 return 0; 534 535 sdp = to_scsi_device(dev); 536 if (sdp->no_uld_attach) 537 return 0; 538 return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0; 539} 540 541static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env) 542{ 543 struct scsi_device *sdev; 544 545 if (dev->type != &scsi_dev_type) 546 return 0; 547 548 sdev = to_scsi_device(dev); 549 550 add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type); 551 return 0; 552} 553 554struct bus_type scsi_bus_type = { 555 .name = "scsi", 556 .match = scsi_bus_match, 557 .uevent = scsi_bus_uevent, 558#ifdef CONFIG_PM 559 .pm = &scsi_bus_pm_ops, 560#endif 561}; 562EXPORT_SYMBOL_GPL(scsi_bus_type); 563 564int scsi_sysfs_register(void) 565{ 566 int error; 567 568 error = bus_register(&scsi_bus_type); 569 if (!error) { 570 error = class_register(&sdev_class); 571 if (error) 572 bus_unregister(&scsi_bus_type); 573 } 574 575 return error; 576} 577 578void scsi_sysfs_unregister(void) 579{ 580 class_unregister(&sdev_class); 581 bus_unregister(&scsi_bus_type); 582} 583 584/* 585 * sdev_show_function: macro to create an attr function that can be used to 586 * show a non-bit field. 587 */ 588#define sdev_show_function(field, format_string) \ 589static ssize_t \ 590sdev_show_##field (struct device *dev, struct device_attribute *attr, \ 591 char *buf) \ 592{ \ 593 struct scsi_device *sdev; \ 594 sdev = to_scsi_device(dev); \ 595 return snprintf (buf, 20, format_string, sdev->field); \ 596} \ 597 598/* 599 * sdev_rd_attr: macro to create a function and attribute variable for a 600 * read only field. 601 */ 602#define sdev_rd_attr(field, format_string) \ 603 sdev_show_function(field, format_string) \ 604static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL); 605 606 607/* 608 * sdev_rw_attr: create a function and attribute variable for a 609 * read/write field. 610 */ 611#define sdev_rw_attr(field, format_string) \ 612 sdev_show_function(field, format_string) \ 613 \ 614static ssize_t \ 615sdev_store_##field (struct device *dev, struct device_attribute *attr, \ 616 const char *buf, size_t count) \ 617{ \ 618 struct scsi_device *sdev; \ 619 sdev = to_scsi_device(dev); \ 620 sscanf (buf, format_string, &sdev->field); \ 621 return count; \ 622} \ 623static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); 624 625/* Currently we don't export bit fields, but we might in future, 626 * so leave this code in */ 627#if 0 628/* 629 * sdev_rd_attr: create a function and attribute variable for a 630 * read/write bit field. 631 */ 632#define sdev_rw_attr_bit(field) \ 633 sdev_show_function(field, "%d\n") \ 634 \ 635static ssize_t \ 636sdev_store_##field (struct device *dev, struct device_attribute *attr, \ 637 const char *buf, size_t count) \ 638{ \ 639 int ret; \ 640 struct scsi_device *sdev; \ 641 ret = scsi_sdev_check_buf_bit(buf); \ 642 if (ret >= 0) { \ 643 sdev = to_scsi_device(dev); \ 644 sdev->field = ret; \ 645 ret = count; \ 646 } \ 647 return ret; \ 648} \ 649static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); 650 651/* 652 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1", 653 * else return -EINVAL. 654 */ 655static int scsi_sdev_check_buf_bit(const char *buf) 656{ 657 if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) { 658 if (buf[0] == '1') 659 return 1; 660 else if (buf[0] == '0') 661 return 0; 662 else 663 return -EINVAL; 664 } else 665 return -EINVAL; 666} 667#endif 668/* 669 * Create the actual show/store functions and data structures. 670 */ 671sdev_rd_attr (type, "%d\n"); 672sdev_rd_attr (scsi_level, "%d\n"); 673sdev_rd_attr (vendor, "%.8s\n"); 674sdev_rd_attr (model, "%.16s\n"); 675sdev_rd_attr (rev, "%.4s\n"); 676 677static ssize_t 678sdev_show_device_busy(struct device *dev, struct device_attribute *attr, 679 char *buf) 680{ 681 struct scsi_device *sdev = to_scsi_device(dev); 682 return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_busy)); 683} 684static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL); 685 686static ssize_t 687sdev_show_device_blocked(struct device *dev, struct device_attribute *attr, 688 char *buf) 689{ 690 struct scsi_device *sdev = to_scsi_device(dev); 691 return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_blocked)); 692} 693static DEVICE_ATTR(device_blocked, S_IRUGO, sdev_show_device_blocked, NULL); 694 695/* 696 * TODO: can we make these symlinks to the block layer ones? 697 */ 698static ssize_t 699sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf) 700{ 701 struct scsi_device *sdev; 702 sdev = to_scsi_device(dev); 703 return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ); 704} 705 706static ssize_t 707sdev_store_timeout (struct device *dev, struct device_attribute *attr, 708 const char *buf, size_t count) 709{ 710 struct scsi_device *sdev; 711 int timeout; 712 sdev = to_scsi_device(dev); 713 sscanf (buf, "%d\n", &timeout); 714 blk_queue_rq_timeout(sdev->request_queue, timeout * HZ); 715 return count; 716} 717static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout); 718 719static ssize_t 720sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf) 721{ 722 struct scsi_device *sdev; 723 sdev = to_scsi_device(dev); 724 return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ); 725} 726 727static ssize_t 728sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr, 729 const char *buf, size_t count) 730{ 731 struct scsi_device *sdev; 732 unsigned int eh_timeout; 733 int err; 734 735 if (!capable(CAP_SYS_ADMIN)) 736 return -EACCES; 737 738 sdev = to_scsi_device(dev); 739 err = kstrtouint(buf, 10, &eh_timeout); 740 if (err) 741 return err; 742 sdev->eh_timeout = eh_timeout * HZ; 743 744 return count; 745} 746static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout); 747 748static ssize_t 749store_rescan_field (struct device *dev, struct device_attribute *attr, 750 const char *buf, size_t count) 751{ 752 scsi_rescan_device(dev); 753 return count; 754} 755static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field); 756 757static ssize_t 758sdev_store_delete(struct device *dev, struct device_attribute *attr, 759 const char *buf, size_t count) 760{ 761 struct kernfs_node *kn; 762 struct scsi_device *sdev = to_scsi_device(dev); 763 764 /* 765 * We need to try to get module, avoiding the module been removed 766 * during delete. 767 */ 768 if (scsi_device_get(sdev)) 769 return -ENODEV; 770 771 kn = sysfs_break_active_protection(&dev->kobj, &attr->attr); 772 WARN_ON_ONCE(!kn); 773 /* 774 * Concurrent writes into the "delete" sysfs attribute may trigger 775 * concurrent calls to device_remove_file() and scsi_remove_device(). 776 * device_remove_file() handles concurrent removal calls by 777 * serializing these and by ignoring the second and later removal 778 * attempts. Concurrent calls of scsi_remove_device() are 779 * serialized. The second and later calls of scsi_remove_device() are 780 * ignored because the first call of that function changes the device 781 * state into SDEV_DEL. 782 */ 783 device_remove_file(dev, attr); 784 scsi_remove_device(sdev); 785 if (kn) 786 sysfs_unbreak_active_protection(kn); 787 scsi_device_put(sdev); 788 return count; 789}; 790static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete); 791 792static ssize_t 793store_state_field(struct device *dev, struct device_attribute *attr, 794 const char *buf, size_t count) 795{ 796 int i, ret; 797 struct scsi_device *sdev = to_scsi_device(dev); 798 enum scsi_device_state state = 0; 799 bool rescan_dev = false; 800 801 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) { 802 const int len = strlen(sdev_states[i].name); 803 if (strncmp(sdev_states[i].name, buf, len) == 0 && 804 buf[len] == '\n') { 805 state = sdev_states[i].value; 806 break; 807 } 808 } 809 switch (state) { 810 case SDEV_RUNNING: 811 case SDEV_OFFLINE: 812 break; 813 default: 814 return -EINVAL; 815 } 816 817 mutex_lock(&sdev->state_mutex); 818 switch (sdev->sdev_state) { 819 case SDEV_RUNNING: 820 case SDEV_OFFLINE: 821 break; 822 default: 823 mutex_unlock(&sdev->state_mutex); 824 return -EINVAL; 825 } 826 if (sdev->sdev_state == SDEV_RUNNING && state == SDEV_RUNNING) { 827 ret = 0; 828 } else { 829 ret = scsi_device_set_state(sdev, state); 830 if (ret == 0 && state == SDEV_RUNNING) 831 rescan_dev = true; 832 } 833 mutex_unlock(&sdev->state_mutex); 834 835 if (rescan_dev) { 836 /* 837 * If the device state changes to SDEV_RUNNING, we need to 838 * run the queue to avoid I/O hang, and rescan the device 839 * to revalidate it. Running the queue first is necessary 840 * because another thread may be waiting inside 841 * blk_mq_freeze_queue_wait() and because that call may be 842 * waiting for pending I/O to finish. 843 */ 844 blk_mq_run_hw_queues(sdev->request_queue, true); 845 scsi_rescan_device(dev); 846 } 847 848 return ret == 0 ? count : -EINVAL; 849} 850 851static ssize_t 852show_state_field(struct device *dev, struct device_attribute *attr, char *buf) 853{ 854 struct scsi_device *sdev = to_scsi_device(dev); 855 const char *name = scsi_device_state_name(sdev->sdev_state); 856 857 if (!name) 858 return -EINVAL; 859 860 return snprintf(buf, 20, "%s\n", name); 861} 862 863static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field); 864 865static ssize_t 866show_queue_type_field(struct device *dev, struct device_attribute *attr, 867 char *buf) 868{ 869 struct scsi_device *sdev = to_scsi_device(dev); 870 const char *name = "none"; 871 872 if (sdev->simple_tags) 873 name = "simple"; 874 875 return snprintf(buf, 20, "%s\n", name); 876} 877 878static ssize_t 879store_queue_type_field(struct device *dev, struct device_attribute *attr, 880 const char *buf, size_t count) 881{ 882 struct scsi_device *sdev = to_scsi_device(dev); 883 884 if (!sdev->tagged_supported) 885 return -EINVAL; 886 887 sdev_printk(KERN_INFO, sdev, 888 "ignoring write to deprecated queue_type attribute"); 889 return count; 890} 891 892static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field, 893 store_queue_type_field); 894 895#define sdev_vpd_pg_attr(_page) \ 896static ssize_t \ 897show_vpd_##_page(struct file *filp, struct kobject *kobj, \ 898 struct bin_attribute *bin_attr, \ 899 char *buf, loff_t off, size_t count) \ 900{ \ 901 struct device *dev = kobj_to_dev(kobj); \ 902 struct scsi_device *sdev = to_scsi_device(dev); \ 903 struct scsi_vpd *vpd_page; \ 904 int ret = -EINVAL; \ 905 \ 906 rcu_read_lock(); \ 907 vpd_page = rcu_dereference(sdev->vpd_##_page); \ 908 if (vpd_page) \ 909 ret = memory_read_from_buffer(buf, count, &off, \ 910 vpd_page->data, vpd_page->len); \ 911 rcu_read_unlock(); \ 912 return ret; \ 913} \ 914static struct bin_attribute dev_attr_vpd_##_page = { \ 915 .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO }, \ 916 .size = 0, \ 917 .read = show_vpd_##_page, \ 918}; 919 920sdev_vpd_pg_attr(pg83); 921sdev_vpd_pg_attr(pg80); 922sdev_vpd_pg_attr(pg89); 923sdev_vpd_pg_attr(pg0); 924 925static ssize_t show_inquiry(struct file *filep, struct kobject *kobj, 926 struct bin_attribute *bin_attr, 927 char *buf, loff_t off, size_t count) 928{ 929 struct device *dev = kobj_to_dev(kobj); 930 struct scsi_device *sdev = to_scsi_device(dev); 931 932 if (!sdev->inquiry) 933 return -EINVAL; 934 935 return memory_read_from_buffer(buf, count, &off, sdev->inquiry, 936 sdev->inquiry_len); 937} 938 939static struct bin_attribute dev_attr_inquiry = { 940 .attr = { 941 .name = "inquiry", 942 .mode = S_IRUGO, 943 }, 944 .size = 0, 945 .read = show_inquiry, 946}; 947 948static ssize_t 949show_iostat_counterbits(struct device *dev, struct device_attribute *attr, 950 char *buf) 951{ 952 return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8); 953} 954 955static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL); 956 957#define show_sdev_iostat(field) \ 958static ssize_t \ 959show_iostat_##field(struct device *dev, struct device_attribute *attr, \ 960 char *buf) \ 961{ \ 962 struct scsi_device *sdev = to_scsi_device(dev); \ 963 unsigned long long count = atomic_read(&sdev->field); \ 964 return snprintf(buf, 20, "0x%llx\n", count); \ 965} \ 966static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL) 967 968show_sdev_iostat(iorequest_cnt); 969show_sdev_iostat(iodone_cnt); 970show_sdev_iostat(ioerr_cnt); 971 972static ssize_t 973sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf) 974{ 975 struct scsi_device *sdev; 976 sdev = to_scsi_device(dev); 977 return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type); 978} 979static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL); 980 981#define DECLARE_EVT_SHOW(name, Cap_name) \ 982static ssize_t \ 983sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \ 984 char *buf) \ 985{ \ 986 struct scsi_device *sdev = to_scsi_device(dev); \ 987 int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\ 988 return snprintf(buf, 20, "%d\n", val); \ 989} 990 991#define DECLARE_EVT_STORE(name, Cap_name) \ 992static ssize_t \ 993sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\ 994 const char *buf, size_t count) \ 995{ \ 996 struct scsi_device *sdev = to_scsi_device(dev); \ 997 int val = simple_strtoul(buf, NULL, 0); \ 998 if (val == 0) \ 999 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \ 1000 else if (val == 1) \ 1001 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \ 1002 else \ 1003 return -EINVAL; \ 1004 return count; \ 1005} 1006 1007#define DECLARE_EVT(name, Cap_name) \ 1008 DECLARE_EVT_SHOW(name, Cap_name) \ 1009 DECLARE_EVT_STORE(name, Cap_name) \ 1010 static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name, \ 1011 sdev_store_evt_##name); 1012#define REF_EVT(name) &dev_attr_evt_##name.attr 1013 1014DECLARE_EVT(media_change, MEDIA_CHANGE) 1015DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED) 1016DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED) 1017DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED) 1018DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED) 1019DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED) 1020 1021static ssize_t 1022sdev_store_queue_depth(struct device *dev, struct device_attribute *attr, 1023 const char *buf, size_t count) 1024{ 1025 int depth, retval; 1026 struct scsi_device *sdev = to_scsi_device(dev); 1027 struct scsi_host_template *sht = sdev->host->hostt; 1028 1029 if (!sht->change_queue_depth) 1030 return -EINVAL; 1031 1032 depth = simple_strtoul(buf, NULL, 0); 1033 1034 if (depth < 1 || depth > sdev->host->can_queue) 1035 return -EINVAL; 1036 1037 retval = sht->change_queue_depth(sdev, depth); 1038 if (retval < 0) 1039 return retval; 1040 1041 sdev->max_queue_depth = sdev->queue_depth; 1042 1043 return count; 1044} 1045sdev_show_function(queue_depth, "%d\n"); 1046 1047static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth, 1048 sdev_store_queue_depth); 1049 1050static ssize_t 1051sdev_show_wwid(struct device *dev, struct device_attribute *attr, 1052 char *buf) 1053{ 1054 struct scsi_device *sdev = to_scsi_device(dev); 1055 ssize_t count; 1056 1057 count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE); 1058 if (count > 0) { 1059 buf[count] = '\n'; 1060 count++; 1061 } 1062 return count; 1063} 1064static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL); 1065 1066#define BLIST_FLAG_NAME(name) \ 1067 [const_ilog2((__force __u64)BLIST_##name)] = #name 1068static const char *const sdev_bflags_name[] = { 1069#include "scsi_devinfo_tbl.c" 1070}; 1071#undef BLIST_FLAG_NAME 1072 1073static ssize_t 1074sdev_show_blacklist(struct device *dev, struct device_attribute *attr, 1075 char *buf) 1076{ 1077 struct scsi_device *sdev = to_scsi_device(dev); 1078 int i; 1079 ssize_t len = 0; 1080 1081 for (i = 0; i < sizeof(sdev->sdev_bflags) * BITS_PER_BYTE; i++) { 1082 const char *name = NULL; 1083 1084 if (!(sdev->sdev_bflags & (__force blist_flags_t)BIT(i))) 1085 continue; 1086 if (i < ARRAY_SIZE(sdev_bflags_name) && sdev_bflags_name[i]) 1087 name = sdev_bflags_name[i]; 1088 1089 if (name) 1090 len += scnprintf(buf + len, PAGE_SIZE - len, 1091 "%s%s", len ? " " : "", name); 1092 else 1093 len += scnprintf(buf + len, PAGE_SIZE - len, 1094 "%sINVALID_BIT(%d)", len ? " " : "", i); 1095 } 1096 if (len) 1097 len += scnprintf(buf + len, PAGE_SIZE - len, "\n"); 1098 return len; 1099} 1100static DEVICE_ATTR(blacklist, S_IRUGO, sdev_show_blacklist, NULL); 1101 1102#ifdef CONFIG_SCSI_DH 1103static ssize_t 1104sdev_show_dh_state(struct device *dev, struct device_attribute *attr, 1105 char *buf) 1106{ 1107 struct scsi_device *sdev = to_scsi_device(dev); 1108 1109 if (!sdev->handler) 1110 return snprintf(buf, 20, "detached\n"); 1111 1112 return snprintf(buf, 20, "%s\n", sdev->handler->name); 1113} 1114 1115static ssize_t 1116sdev_store_dh_state(struct device *dev, struct device_attribute *attr, 1117 const char *buf, size_t count) 1118{ 1119 struct scsi_device *sdev = to_scsi_device(dev); 1120 int err = -EINVAL; 1121 1122 if (sdev->sdev_state == SDEV_CANCEL || 1123 sdev->sdev_state == SDEV_DEL) 1124 return -ENODEV; 1125 1126 if (!sdev->handler) { 1127 /* 1128 * Attach to a device handler 1129 */ 1130 err = scsi_dh_attach(sdev->request_queue, buf); 1131 } else if (!strncmp(buf, "activate", 8)) { 1132 /* 1133 * Activate a device handler 1134 */ 1135 if (sdev->handler->activate) 1136 err = sdev->handler->activate(sdev, NULL, NULL); 1137 else 1138 err = 0; 1139 } else if (!strncmp(buf, "detach", 6)) { 1140 /* 1141 * Detach from a device handler 1142 */ 1143 sdev_printk(KERN_WARNING, sdev, 1144 "can't detach handler %s.\n", 1145 sdev->handler->name); 1146 err = -EINVAL; 1147 } 1148 1149 return err < 0 ? err : count; 1150} 1151 1152static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state, 1153 sdev_store_dh_state); 1154 1155static ssize_t 1156sdev_show_access_state(struct device *dev, 1157 struct device_attribute *attr, 1158 char *buf) 1159{ 1160 struct scsi_device *sdev = to_scsi_device(dev); 1161 unsigned char access_state; 1162 const char *access_state_name; 1163 1164 if (!sdev->handler) 1165 return -EINVAL; 1166 1167 access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK); 1168 access_state_name = scsi_access_state_name(access_state); 1169 1170 return sprintf(buf, "%s\n", 1171 access_state_name ? access_state_name : "unknown"); 1172} 1173static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL); 1174 1175static ssize_t 1176sdev_show_preferred_path(struct device *dev, 1177 struct device_attribute *attr, 1178 char *buf) 1179{ 1180 struct scsi_device *sdev = to_scsi_device(dev); 1181 1182 if (!sdev->handler) 1183 return -EINVAL; 1184 1185 if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED) 1186 return sprintf(buf, "1\n"); 1187 else 1188 return sprintf(buf, "0\n"); 1189} 1190static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL); 1191#endif 1192 1193static ssize_t 1194sdev_show_queue_ramp_up_period(struct device *dev, 1195 struct device_attribute *attr, 1196 char *buf) 1197{ 1198 struct scsi_device *sdev; 1199 sdev = to_scsi_device(dev); 1200 return snprintf(buf, 20, "%u\n", 1201 jiffies_to_msecs(sdev->queue_ramp_up_period)); 1202} 1203 1204static ssize_t 1205sdev_store_queue_ramp_up_period(struct device *dev, 1206 struct device_attribute *attr, 1207 const char *buf, size_t count) 1208{ 1209 struct scsi_device *sdev = to_scsi_device(dev); 1210 unsigned int period; 1211 1212 if (kstrtouint(buf, 10, &period)) 1213 return -EINVAL; 1214 1215 sdev->queue_ramp_up_period = msecs_to_jiffies(period); 1216 return count; 1217} 1218 1219static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR, 1220 sdev_show_queue_ramp_up_period, 1221 sdev_store_queue_ramp_up_period); 1222 1223static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj, 1224 struct attribute *attr, int i) 1225{ 1226 struct device *dev = kobj_to_dev(kobj); 1227 struct scsi_device *sdev = to_scsi_device(dev); 1228 1229 1230 if (attr == &dev_attr_queue_depth.attr && 1231 !sdev->host->hostt->change_queue_depth) 1232 return S_IRUGO; 1233 1234 if (attr == &dev_attr_queue_ramp_up_period.attr && 1235 !sdev->host->hostt->change_queue_depth) 1236 return 0; 1237 1238#ifdef CONFIG_SCSI_DH 1239 if (attr == &dev_attr_access_state.attr && 1240 !sdev->handler) 1241 return 0; 1242 if (attr == &dev_attr_preferred_path.attr && 1243 !sdev->handler) 1244 return 0; 1245#endif 1246 return attr->mode; 1247} 1248 1249static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj, 1250 struct bin_attribute *attr, int i) 1251{ 1252 struct device *dev = kobj_to_dev(kobj); 1253 struct scsi_device *sdev = to_scsi_device(dev); 1254 1255 1256 if (attr == &dev_attr_vpd_pg0 && !sdev->vpd_pg0) 1257 return 0; 1258 1259 if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80) 1260 return 0; 1261 1262 if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83) 1263 return 0; 1264 1265 if (attr == &dev_attr_vpd_pg89 && !sdev->vpd_pg89) 1266 return 0; 1267 1268 return S_IRUGO; 1269} 1270 1271/* Default template for device attributes. May NOT be modified */ 1272static struct attribute *scsi_sdev_attrs[] = { 1273 &dev_attr_device_blocked.attr, 1274 &dev_attr_type.attr, 1275 &dev_attr_scsi_level.attr, 1276 &dev_attr_device_busy.attr, 1277 &dev_attr_vendor.attr, 1278 &dev_attr_model.attr, 1279 &dev_attr_rev.attr, 1280 &dev_attr_rescan.attr, 1281 &dev_attr_delete.attr, 1282 &dev_attr_state.attr, 1283 &dev_attr_timeout.attr, 1284 &dev_attr_eh_timeout.attr, 1285 &dev_attr_iocounterbits.attr, 1286 &dev_attr_iorequest_cnt.attr, 1287 &dev_attr_iodone_cnt.attr, 1288 &dev_attr_ioerr_cnt.attr, 1289 &dev_attr_modalias.attr, 1290 &dev_attr_queue_depth.attr, 1291 &dev_attr_queue_type.attr, 1292 &dev_attr_wwid.attr, 1293 &dev_attr_blacklist.attr, 1294#ifdef CONFIG_SCSI_DH 1295 &dev_attr_dh_state.attr, 1296 &dev_attr_access_state.attr, 1297 &dev_attr_preferred_path.attr, 1298#endif 1299 &dev_attr_queue_ramp_up_period.attr, 1300 REF_EVT(media_change), 1301 REF_EVT(inquiry_change_reported), 1302 REF_EVT(capacity_change_reported), 1303 REF_EVT(soft_threshold_reached), 1304 REF_EVT(mode_parameter_change_reported), 1305 REF_EVT(lun_change_reported), 1306 NULL 1307}; 1308 1309static struct bin_attribute *scsi_sdev_bin_attrs[] = { 1310 &dev_attr_vpd_pg0, 1311 &dev_attr_vpd_pg83, 1312 &dev_attr_vpd_pg80, 1313 &dev_attr_vpd_pg89, 1314 &dev_attr_inquiry, 1315 NULL 1316}; 1317static struct attribute_group scsi_sdev_attr_group = { 1318 .attrs = scsi_sdev_attrs, 1319 .bin_attrs = scsi_sdev_bin_attrs, 1320 .is_visible = scsi_sdev_attr_is_visible, 1321 .is_bin_visible = scsi_sdev_bin_attr_is_visible, 1322}; 1323 1324static const struct attribute_group *scsi_sdev_attr_groups[] = { 1325 &scsi_sdev_attr_group, 1326 NULL 1327}; 1328 1329static int scsi_target_add(struct scsi_target *starget) 1330{ 1331 int error; 1332 1333 if (starget->state != STARGET_CREATED) 1334 return 0; 1335 1336 error = device_add(&starget->dev); 1337 if (error) { 1338 dev_err(&starget->dev, "target device_add failed, error %d\n", error); 1339 return error; 1340 } 1341 transport_add_device(&starget->dev); 1342 starget->state = STARGET_RUNNING; 1343 1344 pm_runtime_set_active(&starget->dev); 1345 pm_runtime_enable(&starget->dev); 1346 device_enable_async_suspend(&starget->dev); 1347 1348 return 0; 1349} 1350 1351/** 1352 * scsi_sysfs_add_sdev - add scsi device to sysfs 1353 * @sdev: scsi_device to add 1354 * 1355 * Return value: 1356 * 0 on Success / non-zero on Failure 1357 **/ 1358int scsi_sysfs_add_sdev(struct scsi_device *sdev) 1359{ 1360 int error, i; 1361 struct request_queue *rq = sdev->request_queue; 1362 struct scsi_target *starget = sdev->sdev_target; 1363 1364 error = scsi_target_add(starget); 1365 if (error) 1366 return error; 1367 1368 transport_configure_device(&starget->dev); 1369 1370 device_enable_async_suspend(&sdev->sdev_gendev); 1371 scsi_autopm_get_target(starget); 1372 pm_runtime_set_active(&sdev->sdev_gendev); 1373 if (!sdev->rpm_autosuspend) 1374 pm_runtime_forbid(&sdev->sdev_gendev); 1375 pm_runtime_enable(&sdev->sdev_gendev); 1376 scsi_autopm_put_target(starget); 1377 1378 scsi_autopm_get_device(sdev); 1379 1380 scsi_dh_add_device(sdev); 1381 1382 error = device_add(&sdev->sdev_gendev); 1383 if (error) { 1384 sdev_printk(KERN_INFO, sdev, 1385 "failed to add device: %d\n", error); 1386 return error; 1387 } 1388 1389 device_enable_async_suspend(&sdev->sdev_dev); 1390 error = device_add(&sdev->sdev_dev); 1391 if (error) { 1392 sdev_printk(KERN_INFO, sdev, 1393 "failed to add class device: %d\n", error); 1394 device_del(&sdev->sdev_gendev); 1395 return error; 1396 } 1397 transport_add_device(&sdev->sdev_gendev); 1398 sdev->is_visible = 1; 1399 1400 error = bsg_scsi_register_queue(rq, &sdev->sdev_gendev); 1401 if (error) 1402 /* we're treating error on bsg register as non-fatal, 1403 * so pretend nothing went wrong */ 1404 sdev_printk(KERN_INFO, sdev, 1405 "Failed to register bsg queue, errno=%d\n", error); 1406 1407 /* add additional host specific attributes */ 1408 if (sdev->host->hostt->sdev_attrs) { 1409 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) { 1410 error = device_create_file(&sdev->sdev_gendev, 1411 sdev->host->hostt->sdev_attrs[i]); 1412 if (error) 1413 return error; 1414 } 1415 } 1416 1417 if (sdev->host->hostt->sdev_groups) { 1418 error = sysfs_create_groups(&sdev->sdev_gendev.kobj, 1419 sdev->host->hostt->sdev_groups); 1420 if (error) 1421 return error; 1422 } 1423 1424 scsi_autopm_put_device(sdev); 1425 return error; 1426} 1427 1428void __scsi_remove_device(struct scsi_device *sdev) 1429{ 1430 struct device *dev = &sdev->sdev_gendev; 1431 int res; 1432 1433 /* 1434 * This cleanup path is not reentrant and while it is impossible 1435 * to get a new reference with scsi_device_get() someone can still 1436 * hold a previously acquired one. 1437 */ 1438 if (sdev->sdev_state == SDEV_DEL) 1439 return; 1440 1441 if (sdev->is_visible) { 1442 /* 1443 * If scsi_internal_target_block() is running concurrently, 1444 * wait until it has finished before changing the device state. 1445 */ 1446 mutex_lock(&sdev->state_mutex); 1447 /* 1448 * If blocked, we go straight to DEL and restart the queue so 1449 * any commands issued during driver shutdown (like sync 1450 * cache) are errored immediately. 1451 */ 1452 res = scsi_device_set_state(sdev, SDEV_CANCEL); 1453 if (res != 0) { 1454 res = scsi_device_set_state(sdev, SDEV_DEL); 1455 if (res == 0) 1456 scsi_start_queue(sdev); 1457 } 1458 mutex_unlock(&sdev->state_mutex); 1459 1460 if (res != 0) 1461 return; 1462 1463 if (sdev->host->hostt->sdev_groups) 1464 sysfs_remove_groups(&sdev->sdev_gendev.kobj, 1465 sdev->host->hostt->sdev_groups); 1466 1467 bsg_unregister_queue(sdev->request_queue); 1468 device_unregister(&sdev->sdev_dev); 1469 transport_remove_device(dev); 1470 device_del(dev); 1471 } else 1472 put_device(&sdev->sdev_dev); 1473 1474 /* 1475 * Stop accepting new requests and wait until all queuecommand() and 1476 * scsi_run_queue() invocations have finished before tearing down the 1477 * device. 1478 */ 1479 mutex_lock(&sdev->state_mutex); 1480 scsi_device_set_state(sdev, SDEV_DEL); 1481 mutex_unlock(&sdev->state_mutex); 1482 1483 blk_cleanup_queue(sdev->request_queue); 1484 cancel_work_sync(&sdev->requeue_work); 1485 1486 if (sdev->host->hostt->slave_destroy) 1487 sdev->host->hostt->slave_destroy(sdev); 1488 transport_destroy_device(dev); 1489 1490 /* 1491 * Paired with the kref_get() in scsi_sysfs_initialize(). We have 1492 * remoed sysfs visibility from the device, so make the target 1493 * invisible if this was the last device underneath it. 1494 */ 1495 scsi_target_reap(scsi_target(sdev)); 1496 1497 put_device(dev); 1498} 1499 1500/** 1501 * scsi_remove_device - unregister a device from the scsi bus 1502 * @sdev: scsi_device to unregister 1503 **/ 1504void scsi_remove_device(struct scsi_device *sdev) 1505{ 1506 struct Scsi_Host *shost = sdev->host; 1507 1508 mutex_lock(&shost->scan_mutex); 1509 __scsi_remove_device(sdev); 1510 mutex_unlock(&shost->scan_mutex); 1511} 1512EXPORT_SYMBOL(scsi_remove_device); 1513 1514static void __scsi_remove_target(struct scsi_target *starget) 1515{ 1516 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 1517 unsigned long flags; 1518 struct scsi_device *sdev; 1519 1520 spin_lock_irqsave(shost->host_lock, flags); 1521 restart: 1522 list_for_each_entry(sdev, &shost->__devices, siblings) { 1523 /* 1524 * We cannot call scsi_device_get() here, as 1525 * we might've been called from rmmod() causing 1526 * scsi_device_get() to fail the module_is_live() 1527 * check. 1528 */ 1529 if (sdev->channel != starget->channel || 1530 sdev->id != starget->id) 1531 continue; 1532 if (sdev->sdev_state == SDEV_DEL || 1533 sdev->sdev_state == SDEV_CANCEL || 1534 !get_device(&sdev->sdev_gendev)) 1535 continue; 1536 spin_unlock_irqrestore(shost->host_lock, flags); 1537 scsi_remove_device(sdev); 1538 put_device(&sdev->sdev_gendev); 1539 spin_lock_irqsave(shost->host_lock, flags); 1540 goto restart; 1541 } 1542 spin_unlock_irqrestore(shost->host_lock, flags); 1543} 1544 1545/** 1546 * scsi_remove_target - try to remove a target and all its devices 1547 * @dev: generic starget or parent of generic stargets to be removed 1548 * 1549 * Note: This is slightly racy. It is possible that if the user 1550 * requests the addition of another device then the target won't be 1551 * removed. 1552 */ 1553void scsi_remove_target(struct device *dev) 1554{ 1555 struct Scsi_Host *shost = dev_to_shost(dev->parent); 1556 struct scsi_target *starget; 1557 unsigned long flags; 1558 1559restart: 1560 spin_lock_irqsave(shost->host_lock, flags); 1561 list_for_each_entry(starget, &shost->__targets, siblings) { 1562 if (starget->state == STARGET_DEL || 1563 starget->state == STARGET_REMOVE || 1564 starget->state == STARGET_CREATED_REMOVE) 1565 continue; 1566 if (starget->dev.parent == dev || &starget->dev == dev) { 1567 kref_get(&starget->reap_ref); 1568 if (starget->state == STARGET_CREATED) 1569 starget->state = STARGET_CREATED_REMOVE; 1570 else 1571 starget->state = STARGET_REMOVE; 1572 spin_unlock_irqrestore(shost->host_lock, flags); 1573 __scsi_remove_target(starget); 1574 scsi_target_reap(starget); 1575 goto restart; 1576 } 1577 } 1578 spin_unlock_irqrestore(shost->host_lock, flags); 1579} 1580EXPORT_SYMBOL(scsi_remove_target); 1581 1582int scsi_register_driver(struct device_driver *drv) 1583{ 1584 drv->bus = &scsi_bus_type; 1585 1586 return driver_register(drv); 1587} 1588EXPORT_SYMBOL(scsi_register_driver); 1589 1590int scsi_register_interface(struct class_interface *intf) 1591{ 1592 intf->class = &sdev_class; 1593 1594 return class_interface_register(intf); 1595} 1596EXPORT_SYMBOL(scsi_register_interface); 1597 1598/** 1599 * scsi_sysfs_add_host - add scsi host to subsystem 1600 * @shost: scsi host struct to add to subsystem 1601 **/ 1602int scsi_sysfs_add_host(struct Scsi_Host *shost) 1603{ 1604 int error, i; 1605 1606 /* add host specific attributes */ 1607 if (shost->hostt->shost_attrs) { 1608 for (i = 0; shost->hostt->shost_attrs[i]; i++) { 1609 error = device_create_file(&shost->shost_dev, 1610 shost->hostt->shost_attrs[i]); 1611 if (error) 1612 return error; 1613 } 1614 } 1615 1616 transport_register_device(&shost->shost_gendev); 1617 transport_configure_device(&shost->shost_gendev); 1618 return 0; 1619} 1620 1621static struct device_type scsi_dev_type = { 1622 .name = "scsi_device", 1623 .release = scsi_device_dev_release, 1624 .groups = scsi_sdev_attr_groups, 1625}; 1626 1627void scsi_sysfs_device_initialize(struct scsi_device *sdev) 1628{ 1629 unsigned long flags; 1630 struct Scsi_Host *shost = sdev->host; 1631 struct scsi_target *starget = sdev->sdev_target; 1632 1633 device_initialize(&sdev->sdev_gendev); 1634 sdev->sdev_gendev.bus = &scsi_bus_type; 1635 sdev->sdev_gendev.type = &scsi_dev_type; 1636 dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu", 1637 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun); 1638 1639 device_initialize(&sdev->sdev_dev); 1640 sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev); 1641 sdev->sdev_dev.class = &sdev_class; 1642 dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu", 1643 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun); 1644 /* 1645 * Get a default scsi_level from the target (derived from sibling 1646 * devices). This is the best we can do for guessing how to set 1647 * sdev->lun_in_cdb for the initial INQUIRY command. For LUN 0 the 1648 * setting doesn't matter, because all the bits are zero anyway. 1649 * But it does matter for higher LUNs. 1650 */ 1651 sdev->scsi_level = starget->scsi_level; 1652 if (sdev->scsi_level <= SCSI_2 && 1653 sdev->scsi_level != SCSI_UNKNOWN && 1654 !shost->no_scsi2_lun_in_cdb) 1655 sdev->lun_in_cdb = 1; 1656 1657 transport_setup_device(&sdev->sdev_gendev); 1658 spin_lock_irqsave(shost->host_lock, flags); 1659 list_add_tail(&sdev->same_target_siblings, &starget->devices); 1660 list_add_tail(&sdev->siblings, &shost->__devices); 1661 spin_unlock_irqrestore(shost->host_lock, flags); 1662 /* 1663 * device can now only be removed via __scsi_remove_device() so hold 1664 * the target. Target will be held in CREATED state until something 1665 * beneath it becomes visible (in which case it moves to RUNNING) 1666 */ 1667 kref_get(&starget->reap_ref); 1668} 1669 1670int scsi_is_sdev_device(const struct device *dev) 1671{ 1672 return dev->type == &scsi_dev_type; 1673} 1674EXPORT_SYMBOL(scsi_is_sdev_device); 1675 1676/* A blank transport template that is used in drivers that don't 1677 * yet implement Transport Attributes */ 1678struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, }; 1679