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#include <linux/bsg.h> 17 18#include <scsi/scsi.h> 19#include <scsi/scsi_device.h> 20#include <scsi/scsi_host.h> 21#include <scsi/scsi_tcq.h> 22#include <scsi/scsi_dh.h> 23#include <scsi/scsi_transport.h> 24#include <scsi/scsi_driver.h> 25#include <scsi/scsi_devinfo.h> 26 27#include "scsi_priv.h" 28#include "scsi_logging.h" 29 30static const struct device_type scsi_dev_type; 31 32static const struct { 33 enum scsi_device_state value; 34 char *name; 35} sdev_states[] = { 36 { SDEV_CREATED, "created" }, 37 { SDEV_RUNNING, "running" }, 38 { SDEV_CANCEL, "cancel" }, 39 { SDEV_DEL, "deleted" }, 40 { SDEV_QUIESCE, "quiesce" }, 41 { SDEV_OFFLINE, "offline" }, 42 { SDEV_TRANSPORT_OFFLINE, "transport-offline" }, 43 { SDEV_BLOCK, "blocked" }, 44 { SDEV_CREATED_BLOCK, "created-blocked" }, 45}; 46 47const char *scsi_device_state_name(enum scsi_device_state state) 48{ 49 int i; 50 char *name = NULL; 51 52 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) { 53 if (sdev_states[i].value == state) { 54 name = sdev_states[i].name; 55 break; 56 } 57 } 58 return name; 59} 60 61static const struct { 62 enum scsi_host_state value; 63 char *name; 64} shost_states[] = { 65 { SHOST_CREATED, "created" }, 66 { SHOST_RUNNING, "running" }, 67 { SHOST_CANCEL, "cancel" }, 68 { SHOST_DEL, "deleted" }, 69 { SHOST_RECOVERY, "recovery" }, 70 { SHOST_CANCEL_RECOVERY, "cancel/recovery" }, 71 { SHOST_DEL_RECOVERY, "deleted/recovery", }, 72}; 73const char *scsi_host_state_name(enum scsi_host_state state) 74{ 75 int i; 76 char *name = NULL; 77 78 for (i = 0; i < ARRAY_SIZE(shost_states); i++) { 79 if (shost_states[i].value == state) { 80 name = shost_states[i].name; 81 break; 82 } 83 } 84 return name; 85} 86 87#ifdef CONFIG_SCSI_DH 88static const struct { 89 unsigned char value; 90 char *name; 91} sdev_access_states[] = { 92 { SCSI_ACCESS_STATE_OPTIMAL, "active/optimized" }, 93 { SCSI_ACCESS_STATE_ACTIVE, "active/non-optimized" }, 94 { SCSI_ACCESS_STATE_STANDBY, "standby" }, 95 { SCSI_ACCESS_STATE_UNAVAILABLE, "unavailable" }, 96 { SCSI_ACCESS_STATE_LBA, "lba-dependent" }, 97 { SCSI_ACCESS_STATE_OFFLINE, "offline" }, 98 { SCSI_ACCESS_STATE_TRANSITIONING, "transitioning" }, 99}; 100 101static const char *scsi_access_state_name(unsigned char state) 102{ 103 int i; 104 char *name = NULL; 105 106 for (i = 0; i < ARRAY_SIZE(sdev_access_states); i++) { 107 if (sdev_access_states[i].value == state) { 108 name = sdev_access_states[i].name; 109 break; 110 } 111 } 112 return name; 113} 114#endif 115 116static int check_set(unsigned long long *val, char *src) 117{ 118 char *last; 119 120 if (strcmp(src, "-") == 0) { 121 *val = SCAN_WILD_CARD; 122 } else { 123 /* 124 * Doesn't check for int overflow 125 */ 126 *val = simple_strtoull(src, &last, 0); 127 if (*last != '\0') 128 return 1; 129 } 130 return 0; 131} 132 133static int scsi_scan(struct Scsi_Host *shost, const char *str) 134{ 135 char s1[15], s2[15], s3[17], junk; 136 unsigned long long channel, id, lun; 137 int res; 138 139 res = sscanf(str, "%10s %10s %16s %c", s1, s2, s3, &junk); 140 if (res != 3) 141 return -EINVAL; 142 if (check_set(&channel, s1)) 143 return -EINVAL; 144 if (check_set(&id, s2)) 145 return -EINVAL; 146 if (check_set(&lun, s3)) 147 return -EINVAL; 148 if (shost->transportt->user_scan) 149 res = shost->transportt->user_scan(shost, channel, id, lun); 150 else 151 res = scsi_scan_host_selected(shost, channel, id, lun, 152 SCSI_SCAN_MANUAL); 153 return res; 154} 155 156/* 157 * shost_show_function: macro to create an attr function that can be used to 158 * show a non-bit field. 159 */ 160#define shost_show_function(name, field, format_string) \ 161static ssize_t \ 162show_##name (struct device *dev, struct device_attribute *attr, \ 163 char *buf) \ 164{ \ 165 struct Scsi_Host *shost = class_to_shost(dev); \ 166 return snprintf (buf, 20, format_string, shost->field); \ 167} 168 169/* 170 * shost_rd_attr: macro to create a function and attribute variable for a 171 * read only field. 172 */ 173#define shost_rd_attr2(name, field, format_string) \ 174 shost_show_function(name, field, format_string) \ 175static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL); 176 177#define shost_rd_attr(field, format_string) \ 178shost_rd_attr2(field, field, format_string) 179 180/* 181 * Create the actual show/store functions and data structures. 182 */ 183 184static ssize_t 185store_scan(struct device *dev, struct device_attribute *attr, 186 const char *buf, size_t count) 187{ 188 struct Scsi_Host *shost = class_to_shost(dev); 189 int res; 190 191 res = scsi_scan(shost, buf); 192 if (res == 0) 193 res = count; 194 return res; 195}; 196static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan); 197 198static ssize_t 199store_shost_state(struct device *dev, struct device_attribute *attr, 200 const char *buf, size_t count) 201{ 202 int i; 203 struct Scsi_Host *shost = class_to_shost(dev); 204 enum scsi_host_state state = 0; 205 206 for (i = 0; i < ARRAY_SIZE(shost_states); i++) { 207 const int len = strlen(shost_states[i].name); 208 if (strncmp(shost_states[i].name, buf, len) == 0 && 209 buf[len] == '\n') { 210 state = shost_states[i].value; 211 break; 212 } 213 } 214 if (!state) 215 return -EINVAL; 216 217 if (scsi_host_set_state(shost, state)) 218 return -EINVAL; 219 return count; 220} 221 222static ssize_t 223show_shost_state(struct device *dev, struct device_attribute *attr, char *buf) 224{ 225 struct Scsi_Host *shost = class_to_shost(dev); 226 const char *name = scsi_host_state_name(shost->shost_state); 227 228 if (!name) 229 return -EINVAL; 230 231 return snprintf(buf, 20, "%s\n", name); 232} 233 234/* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */ 235static struct device_attribute dev_attr_hstate = 236 __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state); 237 238static ssize_t 239show_shost_mode(unsigned int mode, char *buf) 240{ 241 ssize_t len = 0; 242 243 if (mode & MODE_INITIATOR) 244 len = sprintf(buf, "%s", "Initiator"); 245 246 if (mode & MODE_TARGET) 247 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target"); 248 249 len += sprintf(buf + len, "\n"); 250 251 return len; 252} 253 254static ssize_t 255show_shost_supported_mode(struct device *dev, struct device_attribute *attr, 256 char *buf) 257{ 258 struct Scsi_Host *shost = class_to_shost(dev); 259 unsigned int supported_mode = shost->hostt->supported_mode; 260 261 if (supported_mode == MODE_UNKNOWN) 262 /* by default this should be initiator */ 263 supported_mode = MODE_INITIATOR; 264 265 return show_shost_mode(supported_mode, buf); 266} 267 268static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL); 269 270static ssize_t 271show_shost_active_mode(struct device *dev, 272 struct device_attribute *attr, char *buf) 273{ 274 struct Scsi_Host *shost = class_to_shost(dev); 275 276 if (shost->active_mode == MODE_UNKNOWN) 277 return snprintf(buf, 20, "unknown\n"); 278 else 279 return show_shost_mode(shost->active_mode, buf); 280} 281 282static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL); 283 284static int check_reset_type(const char *str) 285{ 286 if (sysfs_streq(str, "adapter")) 287 return SCSI_ADAPTER_RESET; 288 else if (sysfs_streq(str, "firmware")) 289 return SCSI_FIRMWARE_RESET; 290 else 291 return 0; 292} 293 294static ssize_t 295store_host_reset(struct device *dev, struct device_attribute *attr, 296 const char *buf, size_t count) 297{ 298 struct Scsi_Host *shost = class_to_shost(dev); 299 const struct scsi_host_template *sht = shost->hostt; 300 int ret = -EINVAL; 301 int type; 302 303 type = check_reset_type(buf); 304 if (!type) 305 goto exit_store_host_reset; 306 307 if (sht->host_reset) 308 ret = sht->host_reset(shost, type); 309 else 310 ret = -EOPNOTSUPP; 311 312exit_store_host_reset: 313 if (ret == 0) 314 ret = count; 315 return ret; 316} 317 318static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset); 319 320static ssize_t 321show_shost_eh_deadline(struct device *dev, 322 struct device_attribute *attr, char *buf) 323{ 324 struct Scsi_Host *shost = class_to_shost(dev); 325 326 if (shost->eh_deadline == -1) 327 return snprintf(buf, strlen("off") + 2, "off\n"); 328 return sprintf(buf, "%u\n", shost->eh_deadline / HZ); 329} 330 331static ssize_t 332store_shost_eh_deadline(struct device *dev, struct device_attribute *attr, 333 const char *buf, size_t count) 334{ 335 struct Scsi_Host *shost = class_to_shost(dev); 336 int ret = -EINVAL; 337 unsigned long deadline, flags; 338 339 if (shost->transportt && 340 (shost->transportt->eh_strategy_handler || 341 !shost->hostt->eh_host_reset_handler)) 342 return ret; 343 344 if (!strncmp(buf, "off", strlen("off"))) 345 deadline = -1; 346 else { 347 ret = kstrtoul(buf, 10, &deadline); 348 if (ret) 349 return ret; 350 if (deadline * HZ > UINT_MAX) 351 return -EINVAL; 352 } 353 354 spin_lock_irqsave(shost->host_lock, flags); 355 if (scsi_host_in_recovery(shost)) 356 ret = -EBUSY; 357 else { 358 if (deadline == -1) 359 shost->eh_deadline = -1; 360 else 361 shost->eh_deadline = deadline * HZ; 362 363 ret = count; 364 } 365 spin_unlock_irqrestore(shost->host_lock, flags); 366 367 return ret; 368} 369 370static DEVICE_ATTR(eh_deadline, S_IRUGO | S_IWUSR, show_shost_eh_deadline, store_shost_eh_deadline); 371 372shost_rd_attr(unique_id, "%u\n"); 373shost_rd_attr(cmd_per_lun, "%hd\n"); 374shost_rd_attr(can_queue, "%d\n"); 375shost_rd_attr(sg_tablesize, "%hu\n"); 376shost_rd_attr(sg_prot_tablesize, "%hu\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_proc_name.attr, 415 &dev_attr_scan.attr, 416 &dev_attr_hstate.attr, 417 &dev_attr_supported_mode.attr, 418 &dev_attr_active_mode.attr, 419 &dev_attr_prot_capabilities.attr, 420 &dev_attr_prot_guard_type.attr, 421 &dev_attr_host_reset.attr, 422 &dev_attr_eh_deadline.attr, 423 &dev_attr_nr_hw_queues.attr, 424 NULL 425}; 426 427static const struct attribute_group scsi_shost_attr_group = { 428 .attrs = scsi_sysfs_shost_attrs, 429}; 430 431const struct attribute_group *scsi_shost_groups[] = { 432 &scsi_shost_attr_group, 433 NULL 434}; 435 436static void scsi_device_cls_release(struct device *class_dev) 437{ 438 struct scsi_device *sdev; 439 440 sdev = class_to_sdev(class_dev); 441 put_device(&sdev->sdev_gendev); 442} 443 444static void scsi_device_dev_release(struct device *dev) 445{ 446 struct scsi_device *sdev = to_scsi_device(dev); 447 struct device *parent; 448 struct list_head *this, *tmp; 449 struct scsi_vpd *vpd_pg80 = NULL, *vpd_pg83 = NULL; 450 struct scsi_vpd *vpd_pg0 = NULL, *vpd_pg89 = NULL; 451 struct scsi_vpd *vpd_pgb0 = NULL, *vpd_pgb1 = NULL, *vpd_pgb2 = NULL; 452 struct scsi_vpd *vpd_pgb7 = NULL; 453 unsigned long flags; 454 455 might_sleep(); 456 457 scsi_dh_release_device(sdev); 458 459 parent = sdev->sdev_gendev.parent; 460 461 spin_lock_irqsave(sdev->host->host_lock, flags); 462 list_del(&sdev->siblings); 463 list_del(&sdev->same_target_siblings); 464 list_del(&sdev->starved_entry); 465 spin_unlock_irqrestore(sdev->host->host_lock, flags); 466 467 cancel_work_sync(&sdev->event_work); 468 469 list_for_each_safe(this, tmp, &sdev->event_list) { 470 struct scsi_event *evt; 471 472 evt = list_entry(this, struct scsi_event, node); 473 list_del(&evt->node); 474 kfree(evt); 475 } 476 477 blk_put_queue(sdev->request_queue); 478 /* NULL queue means the device can't be used */ 479 sdev->request_queue = NULL; 480 481 sbitmap_free(&sdev->budget_map); 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 vpd_pgb0 = rcu_replace_pointer(sdev->vpd_pgb0, vpd_pgb0, 493 lockdep_is_held(&sdev->inquiry_mutex)); 494 vpd_pgb1 = rcu_replace_pointer(sdev->vpd_pgb1, vpd_pgb1, 495 lockdep_is_held(&sdev->inquiry_mutex)); 496 vpd_pgb2 = rcu_replace_pointer(sdev->vpd_pgb2, vpd_pgb2, 497 lockdep_is_held(&sdev->inquiry_mutex)); 498 vpd_pgb7 = rcu_replace_pointer(sdev->vpd_pgb7, vpd_pgb7, 499 lockdep_is_held(&sdev->inquiry_mutex)); 500 mutex_unlock(&sdev->inquiry_mutex); 501 502 if (vpd_pg0) 503 kfree_rcu(vpd_pg0, rcu); 504 if (vpd_pg83) 505 kfree_rcu(vpd_pg83, rcu); 506 if (vpd_pg80) 507 kfree_rcu(vpd_pg80, rcu); 508 if (vpd_pg89) 509 kfree_rcu(vpd_pg89, rcu); 510 if (vpd_pgb0) 511 kfree_rcu(vpd_pgb0, rcu); 512 if (vpd_pgb1) 513 kfree_rcu(vpd_pgb1, rcu); 514 if (vpd_pgb2) 515 kfree_rcu(vpd_pgb2, rcu); 516 if (vpd_pgb7) 517 kfree_rcu(vpd_pgb7, rcu); 518 kfree(sdev->inquiry); 519 kfree(sdev); 520 521 if (parent) 522 put_device(parent); 523} 524 525static struct class sdev_class = { 526 .name = "scsi_device", 527 .dev_release = scsi_device_cls_release, 528}; 529 530/* all probing is done in the individual ->probe routines */ 531static int scsi_bus_match(struct device *dev, struct device_driver *gendrv) 532{ 533 struct scsi_device *sdp; 534 535 if (dev->type != &scsi_dev_type) 536 return 0; 537 538 sdp = to_scsi_device(dev); 539 if (sdp->no_uld_attach) 540 return 0; 541 return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0; 542} 543 544static int scsi_bus_uevent(const struct device *dev, struct kobj_uevent_env *env) 545{ 546 const struct scsi_device *sdev; 547 548 if (dev->type != &scsi_dev_type) 549 return 0; 550 551 sdev = to_scsi_device(dev); 552 553 add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type); 554 return 0; 555} 556 557const struct bus_type scsi_bus_type = { 558 .name = "scsi", 559 .match = scsi_bus_match, 560 .uevent = scsi_bus_uevent, 561#ifdef CONFIG_PM 562 .pm = &scsi_bus_pm_ops, 563#endif 564}; 565 566int scsi_sysfs_register(void) 567{ 568 int error; 569 570 error = bus_register(&scsi_bus_type); 571 if (!error) { 572 error = class_register(&sdev_class); 573 if (error) 574 bus_unregister(&scsi_bus_type); 575 } 576 577 return error; 578} 579 580void scsi_sysfs_unregister(void) 581{ 582 class_unregister(&sdev_class); 583 bus_unregister(&scsi_bus_type); 584} 585 586/* 587 * sdev_show_function: macro to create an attr function that can be used to 588 * show a non-bit field. 589 */ 590#define sdev_show_function(field, format_string) \ 591static ssize_t \ 592sdev_show_##field (struct device *dev, struct device_attribute *attr, \ 593 char *buf) \ 594{ \ 595 struct scsi_device *sdev; \ 596 sdev = to_scsi_device(dev); \ 597 return snprintf (buf, 20, format_string, sdev->field); \ 598} \ 599 600/* 601 * sdev_rd_attr: macro to create a function and attribute variable for a 602 * read only field. 603 */ 604#define sdev_rd_attr(field, format_string) \ 605 sdev_show_function(field, format_string) \ 606static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL); 607 608 609/* 610 * sdev_rw_attr: create a function and attribute variable for a 611 * read/write field. 612 */ 613#define sdev_rw_attr(field, format_string) \ 614 sdev_show_function(field, format_string) \ 615 \ 616static ssize_t \ 617sdev_store_##field (struct device *dev, struct device_attribute *attr, \ 618 const char *buf, size_t count) \ 619{ \ 620 struct scsi_device *sdev; \ 621 sdev = to_scsi_device(dev); \ 622 sscanf (buf, format_string, &sdev->field); \ 623 return count; \ 624} \ 625static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); 626 627/* Currently we don't export bit fields, but we might in future, 628 * so leave this code in */ 629#if 0 630/* 631 * sdev_rd_attr: create a function and attribute variable for a 632 * read/write bit field. 633 */ 634#define sdev_rw_attr_bit(field) \ 635 sdev_show_function(field, "%d\n") \ 636 \ 637static ssize_t \ 638sdev_store_##field (struct device *dev, struct device_attribute *attr, \ 639 const char *buf, size_t count) \ 640{ \ 641 int ret; \ 642 struct scsi_device *sdev; \ 643 ret = scsi_sdev_check_buf_bit(buf); \ 644 if (ret >= 0) { \ 645 sdev = to_scsi_device(dev); \ 646 sdev->field = ret; \ 647 ret = count; \ 648 } \ 649 return ret; \ 650} \ 651static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field); 652 653/* 654 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1", 655 * else return -EINVAL. 656 */ 657static int scsi_sdev_check_buf_bit(const char *buf) 658{ 659 if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) { 660 if (buf[0] == '1') 661 return 1; 662 else if (buf[0] == '0') 663 return 0; 664 else 665 return -EINVAL; 666 } else 667 return -EINVAL; 668} 669#endif 670/* 671 * Create the actual show/store functions and data structures. 672 */ 673sdev_rd_attr (type, "%d\n"); 674sdev_rd_attr (scsi_level, "%d\n"); 675sdev_rd_attr (vendor, "%.8s\n"); 676sdev_rd_attr (model, "%.16s\n"); 677sdev_rd_attr (rev, "%.4s\n"); 678sdev_rd_attr (cdl_supported, "%d\n"); 679 680static ssize_t 681sdev_show_device_busy(struct device *dev, struct device_attribute *attr, 682 char *buf) 683{ 684 struct scsi_device *sdev = to_scsi_device(dev); 685 return snprintf(buf, 20, "%d\n", scsi_device_busy(sdev)); 686} 687static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL); 688 689static ssize_t 690sdev_show_device_blocked(struct device *dev, struct device_attribute *attr, 691 char *buf) 692{ 693 struct scsi_device *sdev = to_scsi_device(dev); 694 return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_blocked)); 695} 696static DEVICE_ATTR(device_blocked, S_IRUGO, sdev_show_device_blocked, NULL); 697 698/* 699 * TODO: can we make these symlinks to the block layer ones? 700 */ 701static ssize_t 702sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf) 703{ 704 struct scsi_device *sdev; 705 sdev = to_scsi_device(dev); 706 return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ); 707} 708 709static ssize_t 710sdev_store_timeout (struct device *dev, struct device_attribute *attr, 711 const char *buf, size_t count) 712{ 713 struct scsi_device *sdev; 714 int timeout; 715 sdev = to_scsi_device(dev); 716 sscanf (buf, "%d\n", &timeout); 717 blk_queue_rq_timeout(sdev->request_queue, timeout * HZ); 718 return count; 719} 720static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout); 721 722static ssize_t 723sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf) 724{ 725 struct scsi_device *sdev; 726 sdev = to_scsi_device(dev); 727 return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ); 728} 729 730static ssize_t 731sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr, 732 const char *buf, size_t count) 733{ 734 struct scsi_device *sdev; 735 unsigned int eh_timeout; 736 int err; 737 738 if (!capable(CAP_SYS_ADMIN)) 739 return -EACCES; 740 741 sdev = to_scsi_device(dev); 742 err = kstrtouint(buf, 10, &eh_timeout); 743 if (err) 744 return err; 745 sdev->eh_timeout = eh_timeout * HZ; 746 747 return count; 748} 749static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout); 750 751static ssize_t 752store_rescan_field (struct device *dev, struct device_attribute *attr, 753 const char *buf, size_t count) 754{ 755 scsi_rescan_device(to_scsi_device(dev)); 756 return count; 757} 758static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field); 759 760static ssize_t 761sdev_store_delete(struct device *dev, struct device_attribute *attr, 762 const char *buf, size_t count) 763{ 764 struct kernfs_node *kn; 765 struct scsi_device *sdev = to_scsi_device(dev); 766 767 /* 768 * We need to try to get module, avoiding the module been removed 769 * during delete. 770 */ 771 if (scsi_device_get(sdev)) 772 return -ENODEV; 773 774 kn = sysfs_break_active_protection(&dev->kobj, &attr->attr); 775 WARN_ON_ONCE(!kn); 776 /* 777 * Concurrent writes into the "delete" sysfs attribute may trigger 778 * concurrent calls to device_remove_file() and scsi_remove_device(). 779 * device_remove_file() handles concurrent removal calls by 780 * serializing these and by ignoring the second and later removal 781 * attempts. Concurrent calls of scsi_remove_device() are 782 * serialized. The second and later calls of scsi_remove_device() are 783 * ignored because the first call of that function changes the device 784 * state into SDEV_DEL. 785 */ 786 device_remove_file(dev, attr); 787 scsi_remove_device(sdev); 788 if (kn) 789 sysfs_unbreak_active_protection(kn); 790 scsi_device_put(sdev); 791 return count; 792}; 793static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete); 794 795static ssize_t 796store_state_field(struct device *dev, struct device_attribute *attr, 797 const char *buf, size_t count) 798{ 799 int i, ret; 800 struct scsi_device *sdev = to_scsi_device(dev); 801 enum scsi_device_state state = 0; 802 bool rescan_dev = false; 803 804 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) { 805 const int len = strlen(sdev_states[i].name); 806 if (strncmp(sdev_states[i].name, buf, len) == 0 && 807 buf[len] == '\n') { 808 state = sdev_states[i].value; 809 break; 810 } 811 } 812 switch (state) { 813 case SDEV_RUNNING: 814 case SDEV_OFFLINE: 815 break; 816 default: 817 return -EINVAL; 818 } 819 820 mutex_lock(&sdev->state_mutex); 821 switch (sdev->sdev_state) { 822 case SDEV_RUNNING: 823 case SDEV_OFFLINE: 824 break; 825 default: 826 mutex_unlock(&sdev->state_mutex); 827 return -EINVAL; 828 } 829 if (sdev->sdev_state == SDEV_RUNNING && state == SDEV_RUNNING) { 830 ret = 0; 831 } else { 832 ret = scsi_device_set_state(sdev, state); 833 if (ret == 0 && state == SDEV_RUNNING) 834 rescan_dev = true; 835 } 836 mutex_unlock(&sdev->state_mutex); 837 838 if (rescan_dev) { 839 /* 840 * If the device state changes to SDEV_RUNNING, we need to 841 * run the queue to avoid I/O hang, and rescan the device 842 * to revalidate it. Running the queue first is necessary 843 * because another thread may be waiting inside 844 * blk_mq_freeze_queue_wait() and because that call may be 845 * waiting for pending I/O to finish. 846 */ 847 blk_mq_run_hw_queues(sdev->request_queue, true); 848 scsi_rescan_device(sdev); 849 } 850 851 return ret == 0 ? count : -EINVAL; 852} 853 854static ssize_t 855show_state_field(struct device *dev, struct device_attribute *attr, char *buf) 856{ 857 struct scsi_device *sdev = to_scsi_device(dev); 858 const char *name = scsi_device_state_name(sdev->sdev_state); 859 860 if (!name) 861 return -EINVAL; 862 863 return snprintf(buf, 20, "%s\n", name); 864} 865 866static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field); 867 868static ssize_t 869show_queue_type_field(struct device *dev, struct device_attribute *attr, 870 char *buf) 871{ 872 struct scsi_device *sdev = to_scsi_device(dev); 873 const char *name = "none"; 874 875 if (sdev->simple_tags) 876 name = "simple"; 877 878 return snprintf(buf, 20, "%s\n", name); 879} 880 881static ssize_t 882store_queue_type_field(struct device *dev, struct device_attribute *attr, 883 const char *buf, size_t count) 884{ 885 struct scsi_device *sdev = to_scsi_device(dev); 886 887 if (!sdev->tagged_supported) 888 return -EINVAL; 889 890 sdev_printk(KERN_INFO, sdev, 891 "ignoring write to deprecated queue_type attribute"); 892 return count; 893} 894 895static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field, 896 store_queue_type_field); 897 898#define sdev_vpd_pg_attr(_page) \ 899static ssize_t \ 900show_vpd_##_page(struct file *filp, struct kobject *kobj, \ 901 struct bin_attribute *bin_attr, \ 902 char *buf, loff_t off, size_t count) \ 903{ \ 904 struct device *dev = kobj_to_dev(kobj); \ 905 struct scsi_device *sdev = to_scsi_device(dev); \ 906 struct scsi_vpd *vpd_page; \ 907 int ret = -EINVAL; \ 908 \ 909 rcu_read_lock(); \ 910 vpd_page = rcu_dereference(sdev->vpd_##_page); \ 911 if (vpd_page) \ 912 ret = memory_read_from_buffer(buf, count, &off, \ 913 vpd_page->data, vpd_page->len); \ 914 rcu_read_unlock(); \ 915 return ret; \ 916} \ 917static struct bin_attribute dev_attr_vpd_##_page = { \ 918 .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO }, \ 919 .size = 0, \ 920 .read = show_vpd_##_page, \ 921}; 922 923sdev_vpd_pg_attr(pg83); 924sdev_vpd_pg_attr(pg80); 925sdev_vpd_pg_attr(pg89); 926sdev_vpd_pg_attr(pgb0); 927sdev_vpd_pg_attr(pgb1); 928sdev_vpd_pg_attr(pgb2); 929sdev_vpd_pg_attr(pgb7); 930sdev_vpd_pg_attr(pg0); 931 932static ssize_t show_inquiry(struct file *filep, struct kobject *kobj, 933 struct bin_attribute *bin_attr, 934 char *buf, loff_t off, size_t count) 935{ 936 struct device *dev = kobj_to_dev(kobj); 937 struct scsi_device *sdev = to_scsi_device(dev); 938 939 if (!sdev->inquiry) 940 return -EINVAL; 941 942 return memory_read_from_buffer(buf, count, &off, sdev->inquiry, 943 sdev->inquiry_len); 944} 945 946static struct bin_attribute dev_attr_inquiry = { 947 .attr = { 948 .name = "inquiry", 949 .mode = S_IRUGO, 950 }, 951 .size = 0, 952 .read = show_inquiry, 953}; 954 955static ssize_t 956show_iostat_counterbits(struct device *dev, struct device_attribute *attr, 957 char *buf) 958{ 959 return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8); 960} 961 962static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL); 963 964#define show_sdev_iostat(field) \ 965static ssize_t \ 966show_iostat_##field(struct device *dev, struct device_attribute *attr, \ 967 char *buf) \ 968{ \ 969 struct scsi_device *sdev = to_scsi_device(dev); \ 970 unsigned long long count = atomic_read(&sdev->field); \ 971 return snprintf(buf, 20, "0x%llx\n", count); \ 972} \ 973static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL) 974 975show_sdev_iostat(iorequest_cnt); 976show_sdev_iostat(iodone_cnt); 977show_sdev_iostat(ioerr_cnt); 978show_sdev_iostat(iotmo_cnt); 979 980static ssize_t 981sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf) 982{ 983 struct scsi_device *sdev; 984 sdev = to_scsi_device(dev); 985 return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type); 986} 987static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL); 988 989#define DECLARE_EVT_SHOW(name, Cap_name) \ 990static ssize_t \ 991sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \ 992 char *buf) \ 993{ \ 994 struct scsi_device *sdev = to_scsi_device(dev); \ 995 int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\ 996 return snprintf(buf, 20, "%d\n", val); \ 997} 998 999#define DECLARE_EVT_STORE(name, Cap_name) \ 1000static ssize_t \ 1001sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\ 1002 const char *buf, size_t count) \ 1003{ \ 1004 struct scsi_device *sdev = to_scsi_device(dev); \ 1005 int val = simple_strtoul(buf, NULL, 0); \ 1006 if (val == 0) \ 1007 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \ 1008 else if (val == 1) \ 1009 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \ 1010 else \ 1011 return -EINVAL; \ 1012 return count; \ 1013} 1014 1015#define DECLARE_EVT(name, Cap_name) \ 1016 DECLARE_EVT_SHOW(name, Cap_name) \ 1017 DECLARE_EVT_STORE(name, Cap_name) \ 1018 static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name, \ 1019 sdev_store_evt_##name); 1020#define REF_EVT(name) &dev_attr_evt_##name.attr 1021 1022DECLARE_EVT(media_change, MEDIA_CHANGE) 1023DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED) 1024DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED) 1025DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED) 1026DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED) 1027DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED) 1028 1029static ssize_t 1030sdev_store_queue_depth(struct device *dev, struct device_attribute *attr, 1031 const char *buf, size_t count) 1032{ 1033 int depth, retval; 1034 struct scsi_device *sdev = to_scsi_device(dev); 1035 const struct scsi_host_template *sht = sdev->host->hostt; 1036 1037 if (!sht->change_queue_depth) 1038 return -EINVAL; 1039 1040 depth = simple_strtoul(buf, NULL, 0); 1041 1042 if (depth < 1 || depth > sdev->host->can_queue) 1043 return -EINVAL; 1044 1045 retval = sht->change_queue_depth(sdev, depth); 1046 if (retval < 0) 1047 return retval; 1048 1049 sdev->max_queue_depth = sdev->queue_depth; 1050 1051 return count; 1052} 1053sdev_show_function(queue_depth, "%d\n"); 1054 1055static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth, 1056 sdev_store_queue_depth); 1057 1058static ssize_t 1059sdev_show_wwid(struct device *dev, struct device_attribute *attr, 1060 char *buf) 1061{ 1062 struct scsi_device *sdev = to_scsi_device(dev); 1063 ssize_t count; 1064 1065 count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE); 1066 if (count > 0) { 1067 buf[count] = '\n'; 1068 count++; 1069 } 1070 return count; 1071} 1072static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL); 1073 1074#define BLIST_FLAG_NAME(name) \ 1075 [const_ilog2((__force __u64)BLIST_##name)] = #name 1076static const char *const sdev_bflags_name[] = { 1077#include "scsi_devinfo_tbl.c" 1078}; 1079#undef BLIST_FLAG_NAME 1080 1081static ssize_t 1082sdev_show_blacklist(struct device *dev, struct device_attribute *attr, 1083 char *buf) 1084{ 1085 struct scsi_device *sdev = to_scsi_device(dev); 1086 int i; 1087 ssize_t len = 0; 1088 1089 for (i = 0; i < sizeof(sdev->sdev_bflags) * BITS_PER_BYTE; i++) { 1090 const char *name = NULL; 1091 1092 if (!(sdev->sdev_bflags & (__force blist_flags_t)BIT(i))) 1093 continue; 1094 if (i < ARRAY_SIZE(sdev_bflags_name) && sdev_bflags_name[i]) 1095 name = sdev_bflags_name[i]; 1096 1097 if (name) 1098 len += scnprintf(buf + len, PAGE_SIZE - len, 1099 "%s%s", len ? " " : "", name); 1100 else 1101 len += scnprintf(buf + len, PAGE_SIZE - len, 1102 "%sINVALID_BIT(%d)", len ? " " : "", i); 1103 } 1104 if (len) 1105 len += scnprintf(buf + len, PAGE_SIZE - len, "\n"); 1106 return len; 1107} 1108static DEVICE_ATTR(blacklist, S_IRUGO, sdev_show_blacklist, NULL); 1109 1110#ifdef CONFIG_SCSI_DH 1111static ssize_t 1112sdev_show_dh_state(struct device *dev, struct device_attribute *attr, 1113 char *buf) 1114{ 1115 struct scsi_device *sdev = to_scsi_device(dev); 1116 1117 if (!sdev->handler) 1118 return snprintf(buf, 20, "detached\n"); 1119 1120 return snprintf(buf, 20, "%s\n", sdev->handler->name); 1121} 1122 1123static ssize_t 1124sdev_store_dh_state(struct device *dev, struct device_attribute *attr, 1125 const char *buf, size_t count) 1126{ 1127 struct scsi_device *sdev = to_scsi_device(dev); 1128 int err = -EINVAL; 1129 1130 if (sdev->sdev_state == SDEV_CANCEL || 1131 sdev->sdev_state == SDEV_DEL) 1132 return -ENODEV; 1133 1134 if (!sdev->handler) { 1135 /* 1136 * Attach to a device handler 1137 */ 1138 err = scsi_dh_attach(sdev->request_queue, buf); 1139 } else if (!strncmp(buf, "activate", 8)) { 1140 /* 1141 * Activate a device handler 1142 */ 1143 if (sdev->handler->activate) 1144 err = sdev->handler->activate(sdev, NULL, NULL); 1145 else 1146 err = 0; 1147 } else if (!strncmp(buf, "detach", 6)) { 1148 /* 1149 * Detach from a device handler 1150 */ 1151 sdev_printk(KERN_WARNING, sdev, 1152 "can't detach handler %s.\n", 1153 sdev->handler->name); 1154 err = -EINVAL; 1155 } 1156 1157 return err < 0 ? err : count; 1158} 1159 1160static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state, 1161 sdev_store_dh_state); 1162 1163static ssize_t 1164sdev_show_access_state(struct device *dev, 1165 struct device_attribute *attr, 1166 char *buf) 1167{ 1168 struct scsi_device *sdev = to_scsi_device(dev); 1169 unsigned char access_state; 1170 const char *access_state_name; 1171 1172 if (!sdev->handler) 1173 return -EINVAL; 1174 1175 access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK); 1176 access_state_name = scsi_access_state_name(access_state); 1177 1178 return sprintf(buf, "%s\n", 1179 access_state_name ? access_state_name : "unknown"); 1180} 1181static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL); 1182 1183static ssize_t 1184sdev_show_preferred_path(struct device *dev, 1185 struct device_attribute *attr, 1186 char *buf) 1187{ 1188 struct scsi_device *sdev = to_scsi_device(dev); 1189 1190 if (!sdev->handler) 1191 return -EINVAL; 1192 1193 if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED) 1194 return sprintf(buf, "1\n"); 1195 else 1196 return sprintf(buf, "0\n"); 1197} 1198static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL); 1199#endif 1200 1201static ssize_t 1202sdev_show_queue_ramp_up_period(struct device *dev, 1203 struct device_attribute *attr, 1204 char *buf) 1205{ 1206 struct scsi_device *sdev; 1207 sdev = to_scsi_device(dev); 1208 return snprintf(buf, 20, "%u\n", 1209 jiffies_to_msecs(sdev->queue_ramp_up_period)); 1210} 1211 1212static ssize_t 1213sdev_store_queue_ramp_up_period(struct device *dev, 1214 struct device_attribute *attr, 1215 const char *buf, size_t count) 1216{ 1217 struct scsi_device *sdev = to_scsi_device(dev); 1218 unsigned int period; 1219 1220 if (kstrtouint(buf, 10, &period)) 1221 return -EINVAL; 1222 1223 sdev->queue_ramp_up_period = msecs_to_jiffies(period); 1224 return count; 1225} 1226 1227static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR, 1228 sdev_show_queue_ramp_up_period, 1229 sdev_store_queue_ramp_up_period); 1230 1231static ssize_t sdev_show_cdl_enable(struct device *dev, 1232 struct device_attribute *attr, char *buf) 1233{ 1234 struct scsi_device *sdev = to_scsi_device(dev); 1235 1236 return sysfs_emit(buf, "%d\n", (int)sdev->cdl_enable); 1237} 1238 1239static ssize_t sdev_store_cdl_enable(struct device *dev, 1240 struct device_attribute *attr, 1241 const char *buf, size_t count) 1242{ 1243 int ret; 1244 bool v; 1245 1246 if (kstrtobool(buf, &v)) 1247 return -EINVAL; 1248 1249 ret = scsi_cdl_enable(to_scsi_device(dev), v); 1250 if (ret) 1251 return ret; 1252 1253 return count; 1254} 1255static DEVICE_ATTR(cdl_enable, S_IRUGO | S_IWUSR, 1256 sdev_show_cdl_enable, sdev_store_cdl_enable); 1257 1258static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj, 1259 struct attribute *attr, int i) 1260{ 1261 struct device *dev = kobj_to_dev(kobj); 1262 struct scsi_device *sdev = to_scsi_device(dev); 1263 1264 1265 if (attr == &dev_attr_queue_depth.attr && 1266 !sdev->host->hostt->change_queue_depth) 1267 return S_IRUGO; 1268 1269 if (attr == &dev_attr_queue_ramp_up_period.attr && 1270 !sdev->host->hostt->change_queue_depth) 1271 return 0; 1272 1273 return attr->mode; 1274} 1275 1276static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj, 1277 struct bin_attribute *attr, int i) 1278{ 1279 struct device *dev = kobj_to_dev(kobj); 1280 struct scsi_device *sdev = to_scsi_device(dev); 1281 1282 1283 if (attr == &dev_attr_vpd_pg0 && !sdev->vpd_pg0) 1284 return 0; 1285 1286 if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80) 1287 return 0; 1288 1289 if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83) 1290 return 0; 1291 1292 if (attr == &dev_attr_vpd_pg89 && !sdev->vpd_pg89) 1293 return 0; 1294 1295 if (attr == &dev_attr_vpd_pgb0 && !sdev->vpd_pgb0) 1296 return 0; 1297 1298 if (attr == &dev_attr_vpd_pgb1 && !sdev->vpd_pgb1) 1299 return 0; 1300 1301 if (attr == &dev_attr_vpd_pgb2 && !sdev->vpd_pgb2) 1302 return 0; 1303 1304 if (attr == &dev_attr_vpd_pgb7 && !sdev->vpd_pgb7) 1305 return 0; 1306 1307 return S_IRUGO; 1308} 1309 1310/* Default template for device attributes. May NOT be modified */ 1311static struct attribute *scsi_sdev_attrs[] = { 1312 &dev_attr_device_blocked.attr, 1313 &dev_attr_type.attr, 1314 &dev_attr_scsi_level.attr, 1315 &dev_attr_device_busy.attr, 1316 &dev_attr_vendor.attr, 1317 &dev_attr_model.attr, 1318 &dev_attr_rev.attr, 1319 &dev_attr_rescan.attr, 1320 &dev_attr_delete.attr, 1321 &dev_attr_state.attr, 1322 &dev_attr_timeout.attr, 1323 &dev_attr_eh_timeout.attr, 1324 &dev_attr_iocounterbits.attr, 1325 &dev_attr_iorequest_cnt.attr, 1326 &dev_attr_iodone_cnt.attr, 1327 &dev_attr_ioerr_cnt.attr, 1328 &dev_attr_iotmo_cnt.attr, 1329 &dev_attr_modalias.attr, 1330 &dev_attr_queue_depth.attr, 1331 &dev_attr_queue_type.attr, 1332 &dev_attr_wwid.attr, 1333 &dev_attr_blacklist.attr, 1334#ifdef CONFIG_SCSI_DH 1335 &dev_attr_dh_state.attr, 1336 &dev_attr_access_state.attr, 1337 &dev_attr_preferred_path.attr, 1338#endif 1339 &dev_attr_queue_ramp_up_period.attr, 1340 &dev_attr_cdl_supported.attr, 1341 &dev_attr_cdl_enable.attr, 1342 REF_EVT(media_change), 1343 REF_EVT(inquiry_change_reported), 1344 REF_EVT(capacity_change_reported), 1345 REF_EVT(soft_threshold_reached), 1346 REF_EVT(mode_parameter_change_reported), 1347 REF_EVT(lun_change_reported), 1348 NULL 1349}; 1350 1351static struct bin_attribute *scsi_sdev_bin_attrs[] = { 1352 &dev_attr_vpd_pg0, 1353 &dev_attr_vpd_pg83, 1354 &dev_attr_vpd_pg80, 1355 &dev_attr_vpd_pg89, 1356 &dev_attr_vpd_pgb0, 1357 &dev_attr_vpd_pgb1, 1358 &dev_attr_vpd_pgb2, 1359 &dev_attr_vpd_pgb7, 1360 &dev_attr_inquiry, 1361 NULL 1362}; 1363static struct attribute_group scsi_sdev_attr_group = { 1364 .attrs = scsi_sdev_attrs, 1365 .bin_attrs = scsi_sdev_bin_attrs, 1366 .is_visible = scsi_sdev_attr_is_visible, 1367 .is_bin_visible = scsi_sdev_bin_attr_is_visible, 1368}; 1369 1370static const struct attribute_group *scsi_sdev_attr_groups[] = { 1371 &scsi_sdev_attr_group, 1372 NULL 1373}; 1374 1375static int scsi_target_add(struct scsi_target *starget) 1376{ 1377 int error; 1378 1379 if (starget->state != STARGET_CREATED) 1380 return 0; 1381 1382 error = device_add(&starget->dev); 1383 if (error) { 1384 dev_err(&starget->dev, "target device_add failed, error %d\n", error); 1385 return error; 1386 } 1387 transport_add_device(&starget->dev); 1388 starget->state = STARGET_RUNNING; 1389 1390 pm_runtime_set_active(&starget->dev); 1391 pm_runtime_enable(&starget->dev); 1392 device_enable_async_suspend(&starget->dev); 1393 1394 return 0; 1395} 1396 1397/** 1398 * scsi_sysfs_add_sdev - add scsi device to sysfs 1399 * @sdev: scsi_device to add 1400 * 1401 * Return value: 1402 * 0 on Success / non-zero on Failure 1403 **/ 1404int scsi_sysfs_add_sdev(struct scsi_device *sdev) 1405{ 1406 int error; 1407 struct scsi_target *starget = sdev->sdev_target; 1408 1409 error = scsi_target_add(starget); 1410 if (error) 1411 return error; 1412 1413 transport_configure_device(&starget->dev); 1414 1415 device_enable_async_suspend(&sdev->sdev_gendev); 1416 scsi_autopm_get_target(starget); 1417 pm_runtime_set_active(&sdev->sdev_gendev); 1418 if (!sdev->rpm_autosuspend) 1419 pm_runtime_forbid(&sdev->sdev_gendev); 1420 pm_runtime_enable(&sdev->sdev_gendev); 1421 scsi_autopm_put_target(starget); 1422 1423 scsi_autopm_get_device(sdev); 1424 1425 scsi_dh_add_device(sdev); 1426 1427 error = device_add(&sdev->sdev_gendev); 1428 if (error) { 1429 sdev_printk(KERN_INFO, sdev, 1430 "failed to add device: %d\n", error); 1431 return error; 1432 } 1433 1434 device_enable_async_suspend(&sdev->sdev_dev); 1435 error = device_add(&sdev->sdev_dev); 1436 if (error) { 1437 sdev_printk(KERN_INFO, sdev, 1438 "failed to add class device: %d\n", error); 1439 device_del(&sdev->sdev_gendev); 1440 return error; 1441 } 1442 transport_add_device(&sdev->sdev_gendev); 1443 sdev->is_visible = 1; 1444 1445 if (IS_ENABLED(CONFIG_BLK_DEV_BSG)) { 1446 sdev->bsg_dev = scsi_bsg_register_queue(sdev); 1447 if (IS_ERR(sdev->bsg_dev)) { 1448 error = PTR_ERR(sdev->bsg_dev); 1449 sdev_printk(KERN_INFO, sdev, 1450 "Failed to register bsg queue, errno=%d\n", 1451 error); 1452 sdev->bsg_dev = NULL; 1453 } 1454 } 1455 1456 scsi_autopm_put_device(sdev); 1457 return error; 1458} 1459 1460void __scsi_remove_device(struct scsi_device *sdev) 1461{ 1462 struct device *dev = &sdev->sdev_gendev; 1463 int res; 1464 1465 /* 1466 * This cleanup path is not reentrant and while it is impossible 1467 * to get a new reference with scsi_device_get() someone can still 1468 * hold a previously acquired one. 1469 */ 1470 if (sdev->sdev_state == SDEV_DEL) 1471 return; 1472 1473 if (sdev->is_visible) { 1474 /* 1475 * If scsi_internal_target_block() is running concurrently, 1476 * wait until it has finished before changing the device state. 1477 */ 1478 mutex_lock(&sdev->state_mutex); 1479 /* 1480 * If blocked, we go straight to DEL and restart the queue so 1481 * any commands issued during driver shutdown (like sync 1482 * cache) are errored immediately. 1483 */ 1484 res = scsi_device_set_state(sdev, SDEV_CANCEL); 1485 if (res != 0) { 1486 res = scsi_device_set_state(sdev, SDEV_DEL); 1487 if (res == 0) 1488 scsi_start_queue(sdev); 1489 } 1490 mutex_unlock(&sdev->state_mutex); 1491 1492 if (res != 0) 1493 return; 1494 1495 if (IS_ENABLED(CONFIG_BLK_DEV_BSG) && sdev->bsg_dev) 1496 bsg_unregister_queue(sdev->bsg_dev); 1497 device_unregister(&sdev->sdev_dev); 1498 transport_remove_device(dev); 1499 device_del(dev); 1500 } else 1501 put_device(&sdev->sdev_dev); 1502 1503 /* 1504 * Stop accepting new requests and wait until all queuecommand() and 1505 * scsi_run_queue() invocations have finished before tearing down the 1506 * device. 1507 */ 1508 mutex_lock(&sdev->state_mutex); 1509 scsi_device_set_state(sdev, SDEV_DEL); 1510 mutex_unlock(&sdev->state_mutex); 1511 1512 blk_mq_destroy_queue(sdev->request_queue); 1513 kref_put(&sdev->host->tagset_refcnt, scsi_mq_free_tags); 1514 cancel_work_sync(&sdev->requeue_work); 1515 1516 if (sdev->host->hostt->slave_destroy) 1517 sdev->host->hostt->slave_destroy(sdev); 1518 transport_destroy_device(dev); 1519 1520 /* 1521 * Paired with the kref_get() in scsi_sysfs_initialize(). We have 1522 * removed sysfs visibility from the device, so make the target 1523 * invisible if this was the last device underneath it. 1524 */ 1525 scsi_target_reap(scsi_target(sdev)); 1526 1527 put_device(dev); 1528} 1529 1530/** 1531 * scsi_remove_device - unregister a device from the scsi bus 1532 * @sdev: scsi_device to unregister 1533 **/ 1534void scsi_remove_device(struct scsi_device *sdev) 1535{ 1536 struct Scsi_Host *shost = sdev->host; 1537 1538 mutex_lock(&shost->scan_mutex); 1539 __scsi_remove_device(sdev); 1540 mutex_unlock(&shost->scan_mutex); 1541} 1542EXPORT_SYMBOL(scsi_remove_device); 1543 1544static void __scsi_remove_target(struct scsi_target *starget) 1545{ 1546 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 1547 unsigned long flags; 1548 struct scsi_device *sdev; 1549 1550 spin_lock_irqsave(shost->host_lock, flags); 1551 restart: 1552 list_for_each_entry(sdev, &shost->__devices, siblings) { 1553 /* 1554 * We cannot call scsi_device_get() here, as 1555 * we might've been called from rmmod() causing 1556 * scsi_device_get() to fail the module_is_live() 1557 * check. 1558 */ 1559 if (sdev->channel != starget->channel || 1560 sdev->id != starget->id) 1561 continue; 1562 if (sdev->sdev_state == SDEV_DEL || 1563 sdev->sdev_state == SDEV_CANCEL || 1564 !get_device(&sdev->sdev_gendev)) 1565 continue; 1566 spin_unlock_irqrestore(shost->host_lock, flags); 1567 scsi_remove_device(sdev); 1568 put_device(&sdev->sdev_gendev); 1569 spin_lock_irqsave(shost->host_lock, flags); 1570 goto restart; 1571 } 1572 spin_unlock_irqrestore(shost->host_lock, flags); 1573} 1574 1575/** 1576 * scsi_remove_target - try to remove a target and all its devices 1577 * @dev: generic starget or parent of generic stargets to be removed 1578 * 1579 * Note: This is slightly racy. It is possible that if the user 1580 * requests the addition of another device then the target won't be 1581 * removed. 1582 */ 1583void scsi_remove_target(struct device *dev) 1584{ 1585 struct Scsi_Host *shost = dev_to_shost(dev->parent); 1586 struct scsi_target *starget; 1587 unsigned long flags; 1588 1589restart: 1590 spin_lock_irqsave(shost->host_lock, flags); 1591 list_for_each_entry(starget, &shost->__targets, siblings) { 1592 if (starget->state == STARGET_DEL || 1593 starget->state == STARGET_REMOVE || 1594 starget->state == STARGET_CREATED_REMOVE) 1595 continue; 1596 if (starget->dev.parent == dev || &starget->dev == dev) { 1597 kref_get(&starget->reap_ref); 1598 if (starget->state == STARGET_CREATED) 1599 starget->state = STARGET_CREATED_REMOVE; 1600 else 1601 starget->state = STARGET_REMOVE; 1602 spin_unlock_irqrestore(shost->host_lock, flags); 1603 __scsi_remove_target(starget); 1604 scsi_target_reap(starget); 1605 goto restart; 1606 } 1607 } 1608 spin_unlock_irqrestore(shost->host_lock, flags); 1609} 1610EXPORT_SYMBOL(scsi_remove_target); 1611 1612int scsi_register_driver(struct device_driver *drv) 1613{ 1614 drv->bus = &scsi_bus_type; 1615 1616 return driver_register(drv); 1617} 1618EXPORT_SYMBOL(scsi_register_driver); 1619 1620int scsi_register_interface(struct class_interface *intf) 1621{ 1622 intf->class = &sdev_class; 1623 1624 return class_interface_register(intf); 1625} 1626EXPORT_SYMBOL(scsi_register_interface); 1627 1628/** 1629 * scsi_sysfs_add_host - add scsi host to subsystem 1630 * @shost: scsi host struct to add to subsystem 1631 **/ 1632int scsi_sysfs_add_host(struct Scsi_Host *shost) 1633{ 1634 transport_register_device(&shost->shost_gendev); 1635 transport_configure_device(&shost->shost_gendev); 1636 return 0; 1637} 1638 1639static const struct device_type scsi_dev_type = { 1640 .name = "scsi_device", 1641 .release = scsi_device_dev_release, 1642 .groups = scsi_sdev_attr_groups, 1643}; 1644 1645void scsi_sysfs_device_initialize(struct scsi_device *sdev) 1646{ 1647 unsigned long flags; 1648 struct Scsi_Host *shost = sdev->host; 1649 const struct scsi_host_template *hostt = shost->hostt; 1650 struct scsi_target *starget = sdev->sdev_target; 1651 1652 device_initialize(&sdev->sdev_gendev); 1653 sdev->sdev_gendev.bus = &scsi_bus_type; 1654 sdev->sdev_gendev.type = &scsi_dev_type; 1655 scsi_enable_async_suspend(&sdev->sdev_gendev); 1656 dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu", 1657 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun); 1658 sdev->sdev_gendev.groups = hostt->sdev_groups; 1659 1660 device_initialize(&sdev->sdev_dev); 1661 sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev); 1662 sdev->sdev_dev.class = &sdev_class; 1663 dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu", 1664 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun); 1665 /* 1666 * Get a default scsi_level from the target (derived from sibling 1667 * devices). This is the best we can do for guessing how to set 1668 * sdev->lun_in_cdb for the initial INQUIRY command. For LUN 0 the 1669 * setting doesn't matter, because all the bits are zero anyway. 1670 * But it does matter for higher LUNs. 1671 */ 1672 sdev->scsi_level = starget->scsi_level; 1673 if (sdev->scsi_level <= SCSI_2 && 1674 sdev->scsi_level != SCSI_UNKNOWN && 1675 !shost->no_scsi2_lun_in_cdb) 1676 sdev->lun_in_cdb = 1; 1677 1678 transport_setup_device(&sdev->sdev_gendev); 1679 spin_lock_irqsave(shost->host_lock, flags); 1680 list_add_tail(&sdev->same_target_siblings, &starget->devices); 1681 list_add_tail(&sdev->siblings, &shost->__devices); 1682 spin_unlock_irqrestore(shost->host_lock, flags); 1683 /* 1684 * device can now only be removed via __scsi_remove_device() so hold 1685 * the target. Target will be held in CREATED state until something 1686 * beneath it becomes visible (in which case it moves to RUNNING) 1687 */ 1688 kref_get(&starget->reap_ref); 1689} 1690 1691int scsi_is_sdev_device(const struct device *dev) 1692{ 1693 return dev->type == &scsi_dev_type; 1694} 1695EXPORT_SYMBOL(scsi_is_sdev_device); 1696 1697/* A blank transport template that is used in drivers that don't 1698 * yet implement Transport Attributes */ 1699struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, }; 1700