drivers/scsi/scsi_sysfs.c

   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
  30 static struct device_type scsi_dev_type;
  31
  32 static 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
  47 const 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
  61 static 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 };
  73 const 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
  88 static 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
 101 static 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
 116 static 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
 133 static 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)                 \
 161 static ssize_t                                                          \
 162 show_##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)                 \
 175 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
 176
 177 #define shost_rd_attr(field, format_string) \
 178 shost_rd_attr2(field, field, format_string)
 179
 180 /*
 181  * Create the actual show/store functions and data structures.
 182  */
 183
 184 static ssize_t
 185 store_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 };
 196 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
 197
 198 static ssize_t
 199 store_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
 222 static ssize_t
 223 show_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 */
 235 static struct device_attribute dev_attr_hstate =
 236         __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
 237
 238 static ssize_t
 239 show_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
 254 static ssize_t
 255 show_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
 268 static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
 269
 270 static ssize_t
 271 show_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
 282 static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
 283
 284 static 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
 294 static ssize_t
 295 store_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         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
 312 exit_store_host_reset:
 313         if (ret == 0)
 314                 ret = count;
 315         return ret;
 316 }
 317
 318 static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
 319
 320 static ssize_t
 321 show_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
 331 static ssize_t
 332 store_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
 370 static DEVICE_ATTR(eh_deadline, S_IRUGO | S_IWUSR, show_shost_eh_deadline, store_shost_eh_deadline);
 371
 372 shost_rd_attr(unique_id, "%u\n");
 373 shost_rd_attr(cmd_per_lun, "%hd\n");
 374 shost_rd_attr(can_queue, "%d\n");
 375 shost_rd_attr(sg_tablesize, "%hu\n");
 376 shost_rd_attr(sg_prot_tablesize, "%hu\n");
 377 shost_rd_attr(prot_capabilities, "%u\n");
 378 shost_rd_attr(prot_guard_type, "%hd\n");
 379 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
 380
 381 static ssize_t
 382 show_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 }
 387 static DEVICE_ATTR(host_busy, S_IRUGO, show_host_busy, NULL);
 388
 389 static ssize_t
 390 show_use_blk_mq(struct device *dev, struct device_attribute *attr, char *buf)
 391 {
 392         return sprintf(buf, "1\n");
 393 }
 394 static DEVICE_ATTR(use_blk_mq, S_IRUGO, show_use_blk_mq, NULL);
 395
 396 static ssize_t
 397 show_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 }
 404 static DEVICE_ATTR(nr_hw_queues, S_IRUGO, show_nr_hw_queues, NULL);
 405
 406 static 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
 427 static const struct attribute_group scsi_shost_attr_group = {
 428         .attrs =        scsi_sysfs_shost_attrs,
 429 };
 430
 431 const struct attribute_group *scsi_shost_groups[] = {
 432         &scsi_shost_attr_group,
 433         NULL
 434 };
 435
 436 static 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
 444 static void scsi_device_dev_release_usercontext(struct work_struct *work)
 445 {
 446         struct scsi_device *sdev;
 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         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         sbitmap_free(&sdev->budget_map);
 484
 485         mutex_lock(&sdev->inquiry_mutex);
 486         vpd_pg0 = rcu_replace_pointer(sdev->vpd_pg0, vpd_pg0,
 487                                        lockdep_is_held(&sdev->inquiry_mutex));
 488         vpd_pg80 = rcu_replace_pointer(sdev->vpd_pg80, vpd_pg80,
 489                                        lockdep_is_held(&sdev->inquiry_mutex));
 490         vpd_pg83 = rcu_replace_pointer(sdev->vpd_pg83, vpd_pg83,
 491                                        lockdep_is_held(&sdev->inquiry_mutex));
 492         vpd_pg89 = rcu_replace_pointer(sdev->vpd_pg89, vpd_pg89,
 493                                        lockdep_is_held(&sdev->inquiry_mutex));
 494         vpd_pgb0 = rcu_replace_pointer(sdev->vpd_pgb0, vpd_pgb0,
 495                                        lockdep_is_held(&sdev->inquiry_mutex));
 496         vpd_pgb1 = rcu_replace_pointer(sdev->vpd_pgb1, vpd_pgb1,
 497                                        lockdep_is_held(&sdev->inquiry_mutex));
 498         vpd_pgb2 = rcu_replace_pointer(sdev->vpd_pgb2, vpd_pgb2,
 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         kfree(sdev->inquiry);
 517         kfree(sdev);
 518
 519         if (parent)
 520                 put_device(parent);
 521         module_put(mod);
 522 }
 523
 524 static void scsi_device_dev_release(struct device *dev)
 525 {
 526         struct scsi_device *sdp = to_scsi_device(dev);
 527
 528         /* Set module pointer as NULL in case of module unloading */
 529         if (!try_module_get(sdp->host->hostt->module))
 530                 sdp->host->hostt->module = NULL;
 531
 532         execute_in_process_context(scsi_device_dev_release_usercontext,
 533                                    &sdp->ew);
 534 }
 535
 536 static struct class sdev_class = {
 537         .name           = "scsi_device",
 538         .dev_release    = scsi_device_cls_release,
 539 };
 540
 541 /* all probing is done in the individual ->probe routines */
 542 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 543 {
 544         struct scsi_device *sdp;
 545
 546         if (dev->type != &scsi_dev_type)
 547                 return 0;
 548
 549         sdp = to_scsi_device(dev);
 550         if (sdp->no_uld_attach)
 551                 return 0;
 552         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 553 }
 554
 555 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 556 {
 557         struct scsi_device *sdev;
 558
 559         if (dev->type != &scsi_dev_type)
 560                 return 0;
 561
 562         sdev = to_scsi_device(dev);
 563
 564         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 565         return 0;
 566 }
 567
 568 struct bus_type scsi_bus_type = {
 569         .name           = "scsi",
 570         .match          = scsi_bus_match,
 571         .uevent         = scsi_bus_uevent,
 572 #ifdef CONFIG_PM
 573         .pm             = &scsi_bus_pm_ops,
 574 #endif
 575 };
 576 EXPORT_SYMBOL_GPL(scsi_bus_type);
 577
 578 int scsi_sysfs_register(void)
 579 {
 580         int error;
 581
 582         error = bus_register(&scsi_bus_type);
 583         if (!error) {
 584                 error = class_register(&sdev_class);
 585                 if (error)
 586                         bus_unregister(&scsi_bus_type);
 587         }
 588
 589         return error;
 590 }
 591
 592 void scsi_sysfs_unregister(void)
 593 {
 594         class_unregister(&sdev_class);
 595         bus_unregister(&scsi_bus_type);
 596 }
 597
 598 /*
 599  * sdev_show_function: macro to create an attr function that can be used to
 600  * show a non-bit field.
 601  */
 602 #define sdev_show_function(field, format_string)                                \
 603 static ssize_t                                                          \
 604 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 605                    char *buf)                                           \
 606 {                                                                       \
 607         struct scsi_device *sdev;                                       \
 608         sdev = to_scsi_device(dev);                                     \
 609         return snprintf (buf, 20, format_string, sdev->field);          \
 610 }                                                                       \
 611
 612 /*
 613  * sdev_rd_attr: macro to create a function and attribute variable for a
 614  * read only field.
 615  */
 616 #define sdev_rd_attr(field, format_string)                              \
 617         sdev_show_function(field, format_string)                        \
 618 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 619
 620
 621 /*
 622  * sdev_rw_attr: create a function and attribute variable for a
 623  * read/write field.
 624  */
 625 #define sdev_rw_attr(field, format_string)                              \
 626         sdev_show_function(field, format_string)                                \
 627                                                                         \
 628 static ssize_t                                                          \
 629 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 630                     const char *buf, size_t count)                      \
 631 {                                                                       \
 632         struct scsi_device *sdev;                                       \
 633         sdev = to_scsi_device(dev);                                     \
 634         sscanf (buf, format_string, &sdev->field);                      \
 635         return count;                                                   \
 636 }                                                                       \
 637 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 638
 639 /* Currently we don't export bit fields, but we might in future,
 640  * so leave this code in */
 641 #if 0
 642 /*
 643  * sdev_rd_attr: create a function and attribute variable for a
 644  * read/write bit field.
 645  */
 646 #define sdev_rw_attr_bit(field)                                         \
 647         sdev_show_function(field, "%d\n")                                       \
 648                                                                         \
 649 static ssize_t                                                          \
 650 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 651                     const char *buf, size_t count)                      \
 652 {                                                                       \
 653         int ret;                                                        \
 654         struct scsi_device *sdev;                                       \
 655         ret = scsi_sdev_check_buf_bit(buf);                             \
 656         if (ret >= 0)   {                                               \
 657                 sdev = to_scsi_device(dev);                             \
 658                 sdev->field = ret;                                      \
 659                 ret = count;                                            \
 660         }                                                               \
 661         return ret;                                                     \
 662 }                                                                       \
 663 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 664
 665 /*
 666  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 667  * else return -EINVAL.
 668  */
 669 static int scsi_sdev_check_buf_bit(const char *buf)
 670 {
 671         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 672                 if (buf[0] == '1')
 673                         return 1;
 674                 else if (buf[0] == '0')
 675                         return 0;
 676                 else
 677                         return -EINVAL;
 678         } else
 679                 return -EINVAL;
 680 }
 681 #endif
 682 /*
 683  * Create the actual show/store functions and data structures.
 684  */
 685 sdev_rd_attr (type, "%d\n");
 686 sdev_rd_attr (scsi_level, "%d\n");
 687 sdev_rd_attr (vendor, "%.8s\n");
 688 sdev_rd_attr (model, "%.16s\n");
 689 sdev_rd_attr (rev, "%.4s\n");
 690
 691 static ssize_t
 692 sdev_show_device_busy(struct device *dev, struct device_attribute *attr,
 693                 char *buf)
 694 {
 695         struct scsi_device *sdev = to_scsi_device(dev);
 696         return snprintf(buf, 20, "%d\n", scsi_device_busy(sdev));
 697 }
 698 static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL);
 699
 700 static ssize_t
 701 sdev_show_device_blocked(struct device *dev, struct device_attribute *attr,
 702                 char *buf)
 703 {
 704         struct scsi_device *sdev = to_scsi_device(dev);
 705         return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_blocked));
 706 }
 707 static DEVICE_ATTR(device_blocked, S_IRUGO, sdev_show_device_blocked, NULL);
 708
 709 /*
 710  * TODO: can we make these symlinks to the block layer ones?
 711  */
 712 static ssize_t
 713 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 714 {
 715         struct scsi_device *sdev;
 716         sdev = to_scsi_device(dev);
 717         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
 718 }
 719
 720 static ssize_t
 721 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 722                     const char *buf, size_t count)
 723 {
 724         struct scsi_device *sdev;
 725         int timeout;
 726         sdev = to_scsi_device(dev);
 727         sscanf (buf, "%d\n", &timeout);
 728         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
 729         return count;
 730 }
 731 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 732
 733 static ssize_t
 734 sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 735 {
 736         struct scsi_device *sdev;
 737         sdev = to_scsi_device(dev);
 738         return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
 739 }
 740
 741 static ssize_t
 742 sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
 743                     const char *buf, size_t count)
 744 {
 745         struct scsi_device *sdev;
 746         unsigned int eh_timeout;
 747         int err;
 748
 749         if (!capable(CAP_SYS_ADMIN))
 750                 return -EACCES;
 751
 752         sdev = to_scsi_device(dev);
 753         err = kstrtouint(buf, 10, &eh_timeout);
 754         if (err)
 755                 return err;
 756         sdev->eh_timeout = eh_timeout * HZ;
 757
 758         return count;
 759 }
 760 static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
 761
 762 static ssize_t
 763 store_rescan_field (struct device *dev, struct device_attribute *attr,
 764                     const char *buf, size_t count)
 765 {
 766         scsi_rescan_device(dev);
 767         return count;
 768 }
 769 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 770
 771 static ssize_t
 772 sdev_store_delete(struct device *dev, struct device_attribute *attr,
 773                   const char *buf, size_t count)
 774 {
 775         struct kernfs_node *kn;
 776         struct scsi_device *sdev = to_scsi_device(dev);
 777
 778         /*
 779          * We need to try to get module, avoiding the module been removed
 780          * during delete.
 781          */
 782         if (scsi_device_get(sdev))
 783                 return -ENODEV;
 784
 785         kn = sysfs_break_active_protection(&dev->kobj, &attr->attr);
 786         WARN_ON_ONCE(!kn);
 787         /*
 788          * Concurrent writes into the "delete" sysfs attribute may trigger
 789          * concurrent calls to device_remove_file() and scsi_remove_device().
 790          * device_remove_file() handles concurrent removal calls by
 791          * serializing these and by ignoring the second and later removal
 792          * attempts.  Concurrent calls of scsi_remove_device() are
 793          * serialized. The second and later calls of scsi_remove_device() are
 794          * ignored because the first call of that function changes the device
 795          * state into SDEV_DEL.
 796          */
 797         device_remove_file(dev, attr);
 798         scsi_remove_device(sdev);
 799         if (kn)
 800                 sysfs_unbreak_active_protection(kn);
 801         scsi_device_put(sdev);
 802         return count;
 803 };
 804 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 805
 806 static ssize_t
 807 store_state_field(struct device *dev, struct device_attribute *attr,
 808                   const char *buf, size_t count)
 809 {
 810         int i, ret;
 811         struct scsi_device *sdev = to_scsi_device(dev);
 812         enum scsi_device_state state = 0;
 813         bool rescan_dev = false;
 814
 815         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 816                 const int len = strlen(sdev_states[i].name);
 817                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 818                    buf[len] == '\n') {
 819                         state = sdev_states[i].value;
 820                         break;
 821                 }
 822         }
 823         switch (state) {
 824         case SDEV_RUNNING:
 825         case SDEV_OFFLINE:
 826                 break;
 827         default:
 828                 return -EINVAL;
 829         }
 830
 831         mutex_lock(&sdev->state_mutex);
 832         if (sdev->sdev_state == SDEV_RUNNING && state == SDEV_RUNNING) {
 833                 ret = 0;
 834         } else {
 835                 ret = scsi_device_set_state(sdev, state);
 836                 if (ret == 0 && state == SDEV_RUNNING)
 837                         rescan_dev = true;
 838         }
 839         mutex_unlock(&sdev->state_mutex);
 840
 841         if (rescan_dev) {
 842                 /*
 843                  * If the device state changes to SDEV_RUNNING, we need to
 844                  * run the queue to avoid I/O hang, and rescan the device
 845                  * to revalidate it. Running the queue first is necessary
 846                  * because another thread may be waiting inside
 847                  * blk_mq_freeze_queue_wait() and because that call may be
 848                  * waiting for pending I/O to finish.
 849                  */
 850                 blk_mq_run_hw_queues(sdev->request_queue, true);
 851                 scsi_rescan_device(dev);
 852         }
 853
 854         return ret == 0 ? count : -EINVAL;
 855 }
 856
 857 static ssize_t
 858 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 859 {
 860         struct scsi_device *sdev = to_scsi_device(dev);
 861         const char *name = scsi_device_state_name(sdev->sdev_state);
 862
 863         if (!name)
 864                 return -EINVAL;
 865
 866         return snprintf(buf, 20, "%s\n", name);
 867 }
 868
 869 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 870
 871 static ssize_t
 872 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 873                       char *buf)
 874 {
 875         struct scsi_device *sdev = to_scsi_device(dev);
 876         const char *name = "none";
 877
 878         if (sdev->simple_tags)
 879                 name = "simple";
 880
 881         return snprintf(buf, 20, "%s\n", name);
 882 }
 883
 884 static ssize_t
 885 store_queue_type_field(struct device *dev, struct device_attribute *attr,
 886                        const char *buf, size_t count)
 887 {
 888         struct scsi_device *sdev = to_scsi_device(dev);
 889
 890         if (!sdev->tagged_supported)
 891                 return -EINVAL;
 892
 893         sdev_printk(KERN_INFO, sdev,
 894                     "ignoring write to deprecated queue_type attribute");
 895         return count;
 896 }
 897
 898 static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 899                    store_queue_type_field);
 900
 901 #define sdev_vpd_pg_attr(_page)                                         \
 902 static ssize_t                                                  \
 903 show_vpd_##_page(struct file *filp, struct kobject *kobj,       \
 904                  struct bin_attribute *bin_attr,                        \
 905                  char *buf, loff_t off, size_t count)                   \
 906 {                                                                       \
 907         struct device *dev = kobj_to_dev(kobj);                         \
 908         struct scsi_device *sdev = to_scsi_device(dev);                 \
 909         struct scsi_vpd *vpd_page;                                      \
 910         int ret = -EINVAL;                                              \
 911                                                                         \
 912         rcu_read_lock();                                                \
 913         vpd_page = rcu_dereference(sdev->vpd_##_page);                  \
 914         if (vpd_page)                                                   \
 915                 ret = memory_read_from_buffer(buf, count, &off,         \
 916                                 vpd_page->data, vpd_page->len);         \
 917         rcu_read_unlock();                                              \
 918         return ret;                                                     \
 919 }                                                                       \
 920 static struct bin_attribute dev_attr_vpd_##_page = {            \
 921         .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO },   \
 922         .size = 0,                                                      \
 923         .read = show_vpd_##_page,                                       \
 924 };
 925
 926 sdev_vpd_pg_attr(pg83);
 927 sdev_vpd_pg_attr(pg80);
 928 sdev_vpd_pg_attr(pg89);
 929 sdev_vpd_pg_attr(pgb0);
 930 sdev_vpd_pg_attr(pgb1);
 931 sdev_vpd_pg_attr(pgb2);
 932 sdev_vpd_pg_attr(pg0);
 933
 934 static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
 935                             struct bin_attribute *bin_attr,
 936                             char *buf, loff_t off, size_t count)
 937 {
 938         struct device *dev = kobj_to_dev(kobj);
 939         struct scsi_device *sdev = to_scsi_device(dev);
 940
 941         if (!sdev->inquiry)
 942                 return -EINVAL;
 943
 944         return memory_read_from_buffer(buf, count, &off, sdev->inquiry,
 945                                        sdev->inquiry_len);
 946 }
 947
 948 static struct bin_attribute dev_attr_inquiry = {
 949         .attr = {
 950                 .name = "inquiry",
 951                 .mode = S_IRUGO,
 952         },
 953         .size = 0,
 954         .read = show_inquiry,
 955 };
 956
 957 static ssize_t
 958 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
 959                         char *buf)
 960 {
 961         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 962 }
 963
 964 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 965
 966 #define show_sdev_iostat(field)                                         \
 967 static ssize_t                                                          \
 968 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 969                     char *buf)                                          \
 970 {                                                                       \
 971         struct scsi_device *sdev = to_scsi_device(dev);                 \
 972         unsigned long long count = atomic_read(&sdev->field);           \
 973         return snprintf(buf, 20, "0x%llx\n", count);                    \
 974 }                                                                       \
 975 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 976
 977 show_sdev_iostat(iorequest_cnt);
 978 show_sdev_iostat(iodone_cnt);
 979 show_sdev_iostat(ioerr_cnt);
 980
 981 static ssize_t
 982 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 983 {
 984         struct scsi_device *sdev;
 985         sdev = to_scsi_device(dev);
 986         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 987 }
 988 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 989
 990 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 991 static ssize_t                                                          \
 992 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 993                      char *buf)                                         \
 994 {                                                                       \
 995         struct scsi_device *sdev = to_scsi_device(dev);                 \
 996         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 997         return snprintf(buf, 20, "%d\n", val);                          \
 998 }
 999
1000 #define DECLARE_EVT_STORE(name, Cap_name)                               \
1001 static ssize_t                                                          \
1002 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
1003                       const char *buf, size_t count)                    \
1004 {                                                                       \
1005         struct scsi_device *sdev = to_scsi_device(dev);                 \
1006         int val = simple_strtoul(buf, NULL, 0);                         \
1007         if (val == 0)                                                   \
1008                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
1009         else if (val == 1)                                              \
1010                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
1011         else                                                            \
1012                 return -EINVAL;                                         \
1013         return count;                                                   \
1014 }
1015
1016 #define DECLARE_EVT(name, Cap_name)                                     \
1017         DECLARE_EVT_SHOW(name, Cap_name)                                \
1018         DECLARE_EVT_STORE(name, Cap_name)                               \
1019         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
1020                            sdev_store_evt_##name);
1021 #define REF_EVT(name) &dev_attr_evt_##name.attr
1022
1023 DECLARE_EVT(media_change, MEDIA_CHANGE)
1024 DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
1025 DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
1026 DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
1027 DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
1028 DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
1029
1030 static ssize_t
1031 sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
1032                        const char *buf, size_t count)
1033 {
1034         int depth, retval;
1035         struct scsi_device *sdev = to_scsi_device(dev);
1036         struct scsi_host_template *sht = sdev->host->hostt;
1037
1038         if (!sht->change_queue_depth)
1039                 return -EINVAL;
1040
1041         depth = simple_strtoul(buf, NULL, 0);
1042
1043         if (depth < 1 || depth > sdev->host->can_queue)
1044                 return -EINVAL;
1045
1046         retval = sht->change_queue_depth(sdev, depth);
1047         if (retval < 0)
1048                 return retval;
1049
1050         sdev->max_queue_depth = sdev->queue_depth;
1051
1052         return count;
1053 }
1054 sdev_show_function(queue_depth, "%d\n");
1055
1056 static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
1057                    sdev_store_queue_depth);
1058
1059 static ssize_t
1060 sdev_show_wwid(struct device *dev, struct device_attribute *attr,
1061                     char *buf)
1062 {
1063         struct scsi_device *sdev = to_scsi_device(dev);
1064         ssize_t count;
1065
1066         count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
1067         if (count > 0) {
1068                 buf[count] = '\n';
1069                 count++;
1070         }
1071         return count;
1072 }
1073 static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
1074
1075 #define BLIST_FLAG_NAME(name)                                   \
1076         [const_ilog2((__force __u64)BLIST_##name)] = #name
1077 static const char *const sdev_bflags_name[] = {
1078 #include "scsi_devinfo_tbl.c"
1079 };
1080 #undef BLIST_FLAG_NAME
1081
1082 static ssize_t
1083 sdev_show_blacklist(struct device *dev, struct device_attribute *attr,
1084                     char *buf)
1085 {
1086         struct scsi_device *sdev = to_scsi_device(dev);
1087         int i;
1088         ssize_t len = 0;
1089
1090         for (i = 0; i < sizeof(sdev->sdev_bflags) * BITS_PER_BYTE; i++) {
1091                 const char *name = NULL;
1092
1093                 if (!(sdev->sdev_bflags & (__force blist_flags_t)BIT(i)))
1094                         continue;
1095                 if (i < ARRAY_SIZE(sdev_bflags_name) && sdev_bflags_name[i])
1096                         name = sdev_bflags_name[i];
1097
1098                 if (name)
1099                         len += scnprintf(buf + len, PAGE_SIZE - len,
1100                                          "%s%s", len ? " " : "", name);
1101                 else
1102                         len += scnprintf(buf + len, PAGE_SIZE - len,
1103                                          "%sINVALID_BIT(%d)", len ? " " : "", i);
1104         }
1105         if (len)
1106                 len += scnprintf(buf + len, PAGE_SIZE - len, "\n");
1107         return len;
1108 }
1109 static DEVICE_ATTR(blacklist, S_IRUGO, sdev_show_blacklist, NULL);
1110
1111 #ifdef CONFIG_SCSI_DH
1112 static ssize_t
1113 sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
1114                    char *buf)
1115 {
1116         struct scsi_device *sdev = to_scsi_device(dev);
1117
1118         if (!sdev->handler)
1119                 return snprintf(buf, 20, "detached\n");
1120
1121         return snprintf(buf, 20, "%s\n", sdev->handler->name);
1122 }
1123
1124 static ssize_t
1125 sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
1126                     const char *buf, size_t count)
1127 {
1128         struct scsi_device *sdev = to_scsi_device(dev);
1129         int err = -EINVAL;
1130
1131         if (sdev->sdev_state == SDEV_CANCEL ||
1132             sdev->sdev_state == SDEV_DEL)
1133                 return -ENODEV;
1134
1135         if (!sdev->handler) {
1136                 /*
1137                  * Attach to a device handler
1138                  */
1139                 err = scsi_dh_attach(sdev->request_queue, buf);
1140         } else if (!strncmp(buf, "activate", 8)) {
1141                 /*
1142                  * Activate a device handler
1143                  */
1144                 if (sdev->handler->activate)
1145                         err = sdev->handler->activate(sdev, NULL, NULL);
1146                 else
1147                         err = 0;
1148         } else if (!strncmp(buf, "detach", 6)) {
1149                 /*
1150                  * Detach from a device handler
1151                  */
1152                 sdev_printk(KERN_WARNING, sdev,
1153                             "can't detach handler %s.\n",
1154                             sdev->handler->name);
1155                 err = -EINVAL;
1156         }
1157
1158         return err < 0 ? err : count;
1159 }
1160
1161 static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
1162                    sdev_store_dh_state);
1163
1164 static ssize_t
1165 sdev_show_access_state(struct device *dev,
1166                        struct device_attribute *attr,
1167                        char *buf)
1168 {
1169         struct scsi_device *sdev = to_scsi_device(dev);
1170         unsigned char access_state;
1171         const char *access_state_name;
1172
1173         if (!sdev->handler)
1174                 return -EINVAL;
1175
1176         access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK);
1177         access_state_name = scsi_access_state_name(access_state);
1178
1179         return sprintf(buf, "%s\n",
1180                        access_state_name ? access_state_name : "unknown");
1181 }
1182 static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL);
1183
1184 static ssize_t
1185 sdev_show_preferred_path(struct device *dev,
1186                          struct device_attribute *attr,
1187                          char *buf)
1188 {
1189         struct scsi_device *sdev = to_scsi_device(dev);
1190
1191         if (!sdev->handler)
1192                 return -EINVAL;
1193
1194         if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED)
1195                 return sprintf(buf, "1\n");
1196         else
1197                 return sprintf(buf, "0\n");
1198 }
1199 static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL);
1200 #endif
1201
1202 static ssize_t
1203 sdev_show_queue_ramp_up_period(struct device *dev,
1204                                struct device_attribute *attr,
1205                                char *buf)
1206 {
1207         struct scsi_device *sdev;
1208         sdev = to_scsi_device(dev);
1209         return snprintf(buf, 20, "%u\n",
1210                         jiffies_to_msecs(sdev->queue_ramp_up_period));
1211 }
1212
1213 static ssize_t
1214 sdev_store_queue_ramp_up_period(struct device *dev,
1215                                 struct device_attribute *attr,
1216                                 const char *buf, size_t count)
1217 {
1218         struct scsi_device *sdev = to_scsi_device(dev);
1219         unsigned int period;
1220
1221         if (kstrtouint(buf, 10, &period))
1222                 return -EINVAL;
1223
1224         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
1225         return count;
1226 }
1227
1228 static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
1229                    sdev_show_queue_ramp_up_period,
1230                    sdev_store_queue_ramp_up_period);
1231
1232 static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
1233                                          struct attribute *attr, int i)
1234 {
1235         struct device *dev = kobj_to_dev(kobj);
1236         struct scsi_device *sdev = to_scsi_device(dev);
1237
1238
1239         if (attr == &dev_attr_queue_depth.attr &&
1240             !sdev->host->hostt->change_queue_depth)
1241                 return S_IRUGO;
1242
1243         if (attr == &dev_attr_queue_ramp_up_period.attr &&
1244             !sdev->host->hostt->change_queue_depth)
1245                 return 0;
1246
1247         return attr->mode;
1248 }
1249
1250 static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
1251                                              struct bin_attribute *attr, int i)
1252 {
1253         struct device *dev = kobj_to_dev(kobj);
1254         struct scsi_device *sdev = to_scsi_device(dev);
1255
1256
1257         if (attr == &dev_attr_vpd_pg0 && !sdev->vpd_pg0)
1258                 return 0;
1259
1260         if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80)
1261                 return 0;
1262
1263         if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83)
1264                 return 0;
1265
1266         if (attr == &dev_attr_vpd_pg89 && !sdev->vpd_pg89)
1267                 return 0;
1268
1269         if (attr == &dev_attr_vpd_pgb0 && !sdev->vpd_pgb0)
1270                 return 0;
1271
1272         if (attr == &dev_attr_vpd_pgb1 && !sdev->vpd_pgb1)
1273                 return 0;
1274
1275         if (attr == &dev_attr_vpd_pgb2 && !sdev->vpd_pgb2)
1276                 return 0;
1277
1278         return S_IRUGO;
1279 }
1280
1281 /* Default template for device attributes.  May NOT be modified */
1282 static struct attribute *scsi_sdev_attrs[] = {
1283         &dev_attr_device_blocked.attr,
1284         &dev_attr_type.attr,
1285         &dev_attr_scsi_level.attr,
1286         &dev_attr_device_busy.attr,
1287         &dev_attr_vendor.attr,
1288         &dev_attr_model.attr,
1289         &dev_attr_rev.attr,
1290         &dev_attr_rescan.attr,
1291         &dev_attr_delete.attr,
1292         &dev_attr_state.attr,
1293         &dev_attr_timeout.attr,
1294         &dev_attr_eh_timeout.attr,
1295         &dev_attr_iocounterbits.attr,
1296         &dev_attr_iorequest_cnt.attr,
1297         &dev_attr_iodone_cnt.attr,
1298         &dev_attr_ioerr_cnt.attr,
1299         &dev_attr_modalias.attr,
1300         &dev_attr_queue_depth.attr,
1301         &dev_attr_queue_type.attr,
1302         &dev_attr_wwid.attr,
1303         &dev_attr_blacklist.attr,
1304 #ifdef CONFIG_SCSI_DH
1305         &dev_attr_dh_state.attr,
1306         &dev_attr_access_state.attr,
1307         &dev_attr_preferred_path.attr,
1308 #endif
1309         &dev_attr_queue_ramp_up_period.attr,
1310         REF_EVT(media_change),
1311         REF_EVT(inquiry_change_reported),
1312         REF_EVT(capacity_change_reported),
1313         REF_EVT(soft_threshold_reached),
1314         REF_EVT(mode_parameter_change_reported),
1315         REF_EVT(lun_change_reported),
1316         NULL
1317 };
1318
1319 static struct bin_attribute *scsi_sdev_bin_attrs[] = {
1320         &dev_attr_vpd_pg0,
1321         &dev_attr_vpd_pg83,
1322         &dev_attr_vpd_pg80,
1323         &dev_attr_vpd_pg89,
1324         &dev_attr_vpd_pgb0,
1325         &dev_attr_vpd_pgb1,
1326         &dev_attr_vpd_pgb2,
1327         &dev_attr_inquiry,
1328         NULL
1329 };
1330 static struct attribute_group scsi_sdev_attr_group = {
1331         .attrs =        scsi_sdev_attrs,
1332         .bin_attrs =    scsi_sdev_bin_attrs,
1333         .is_visible =   scsi_sdev_attr_is_visible,
1334         .is_bin_visible = scsi_sdev_bin_attr_is_visible,
1335 };
1336
1337 static const struct attribute_group *scsi_sdev_attr_groups[] = {
1338         &scsi_sdev_attr_group,
1339         NULL
1340 };
1341
1342 static int scsi_target_add(struct scsi_target *starget)
1343 {
1344         int error;
1345
1346         if (starget->state != STARGET_CREATED)
1347                 return 0;
1348
1349         error = device_add(&starget->dev);
1350         if (error) {
1351                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
1352                 return error;
1353         }
1354         transport_add_device(&starget->dev);
1355         starget->state = STARGET_RUNNING;
1356
1357         pm_runtime_set_active(&starget->dev);
1358         pm_runtime_enable(&starget->dev);
1359         device_enable_async_suspend(&starget->dev);
1360
1361         return 0;
1362 }
1363
1364 /**
1365  * scsi_sysfs_add_sdev - add scsi device to sysfs
1366  * @sdev:       scsi_device to add
1367  *
1368  * Return value:
1369  *      0 on Success / non-zero on Failure
1370  **/
1371 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1372 {
1373         int error;
1374         struct scsi_target *starget = sdev->sdev_target;
1375
1376         error = scsi_target_add(starget);
1377         if (error)
1378                 return error;
1379
1380         transport_configure_device(&starget->dev);
1381
1382         device_enable_async_suspend(&sdev->sdev_gendev);
1383         scsi_autopm_get_target(starget);
1384         pm_runtime_set_active(&sdev->sdev_gendev);
1385         if (!sdev->rpm_autosuspend)
1386                 pm_runtime_forbid(&sdev->sdev_gendev);
1387         pm_runtime_enable(&sdev->sdev_gendev);
1388         scsi_autopm_put_target(starget);
1389
1390         scsi_autopm_get_device(sdev);
1391
1392         scsi_dh_add_device(sdev);
1393
1394         error = device_add(&sdev->sdev_gendev);
1395         if (error) {
1396                 sdev_printk(KERN_INFO, sdev,
1397                                 "failed to add device: %d\n", error);
1398                 return error;
1399         }
1400
1401         device_enable_async_suspend(&sdev->sdev_dev);
1402         error = device_add(&sdev->sdev_dev);
1403         if (error) {
1404                 sdev_printk(KERN_INFO, sdev,
1405                                 "failed to add class device: %d\n", error);
1406                 device_del(&sdev->sdev_gendev);
1407                 return error;
1408         }
1409         transport_add_device(&sdev->sdev_gendev);
1410         sdev->is_visible = 1;
1411
1412         if (IS_ENABLED(CONFIG_BLK_DEV_BSG)) {
1413                 sdev->bsg_dev = scsi_bsg_register_queue(sdev);
1414                 if (IS_ERR(sdev->bsg_dev)) {
1415                         error = PTR_ERR(sdev->bsg_dev);
1416                         sdev_printk(KERN_INFO, sdev,
1417                                     "Failed to register bsg queue, errno=%d\n",
1418                                     error);
1419                         sdev->bsg_dev = NULL;
1420                 }
1421         }
1422
1423         scsi_autopm_put_device(sdev);
1424         return error;
1425 }
1426
1427 void __scsi_remove_device(struct scsi_device *sdev)
1428 {
1429         struct device *dev = &sdev->sdev_gendev;
1430         int res;
1431
1432         /*
1433          * This cleanup path is not reentrant and while it is impossible
1434          * to get a new reference with scsi_device_get() someone can still
1435          * hold a previously acquired one.
1436          */
1437         if (sdev->sdev_state == SDEV_DEL)
1438                 return;
1439
1440         if (sdev->is_visible) {
1441                 /*
1442                  * If scsi_internal_target_block() is running concurrently,
1443                  * wait until it has finished before changing the device state.
1444                  */
1445                 mutex_lock(&sdev->state_mutex);
1446                 /*
1447                  * If blocked, we go straight to DEL and restart the queue so
1448                  * any commands issued during driver shutdown (like sync
1449                  * cache) are errored immediately.
1450                  */
1451                 res = scsi_device_set_state(sdev, SDEV_CANCEL);
1452                 if (res != 0) {
1453                         res = scsi_device_set_state(sdev, SDEV_DEL);
1454                         if (res == 0)
1455                                 scsi_start_queue(sdev);
1456                 }
1457                 mutex_unlock(&sdev->state_mutex);
1458
1459                 if (res != 0)
1460                         return;
1461
1462                 if (IS_ENABLED(CONFIG_BLK_DEV_BSG) && sdev->bsg_dev)
1463                         bsg_unregister_queue(sdev->bsg_dev);
1464                 device_unregister(&sdev->sdev_dev);
1465                 transport_remove_device(dev);
1466                 device_del(dev);
1467         } else
1468                 put_device(&sdev->sdev_dev);
1469
1470         /*
1471          * Stop accepting new requests and wait until all queuecommand() and
1472          * scsi_run_queue() invocations have finished before tearing down the
1473          * device.
1474          */
1475         mutex_lock(&sdev->state_mutex);
1476         scsi_device_set_state(sdev, SDEV_DEL);
1477         mutex_unlock(&sdev->state_mutex);
1478
1479         blk_cleanup_queue(sdev->request_queue);
1480         cancel_work_sync(&sdev->requeue_work);
1481
1482         if (sdev->host->hostt->slave_destroy)
1483                 sdev->host->hostt->slave_destroy(sdev);
1484         transport_destroy_device(dev);
1485
1486         /*
1487          * Paired with the kref_get() in scsi_sysfs_initialize().  We have
1488          * removed sysfs visibility from the device, so make the target
1489          * invisible if this was the last device underneath it.
1490          */
1491         scsi_target_reap(scsi_target(sdev));
1492
1493         put_device(dev);
1494 }
1495
1496 /**
1497  * scsi_remove_device - unregister a device from the scsi bus
1498  * @sdev:       scsi_device to unregister
1499  **/
1500 void scsi_remove_device(struct scsi_device *sdev)
1501 {
1502         struct Scsi_Host *shost = sdev->host;
1503
1504         mutex_lock(&shost->scan_mutex);
1505         __scsi_remove_device(sdev);
1506         mutex_unlock(&shost->scan_mutex);
1507 }
1508 EXPORT_SYMBOL(scsi_remove_device);
1509
1510 static void __scsi_remove_target(struct scsi_target *starget)
1511 {
1512         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1513         unsigned long flags;
1514         struct scsi_device *sdev;
1515
1516         spin_lock_irqsave(shost->host_lock, flags);
1517  restart:
1518         list_for_each_entry(sdev, &shost->__devices, siblings) {
1519                 /*
1520                  * We cannot call scsi_device_get() here, as
1521                  * we might've been called from rmmod() causing
1522                  * scsi_device_get() to fail the module_is_live()
1523                  * check.
1524                  */
1525                 if (sdev->channel != starget->channel ||
1526                     sdev->id != starget->id)
1527                         continue;
1528                 if (sdev->sdev_state == SDEV_DEL ||
1529                     sdev->sdev_state == SDEV_CANCEL ||
1530                     !get_device(&sdev->sdev_gendev))
1531                         continue;
1532                 spin_unlock_irqrestore(shost->host_lock, flags);
1533                 scsi_remove_device(sdev);
1534                 put_device(&sdev->sdev_gendev);
1535                 spin_lock_irqsave(shost->host_lock, flags);
1536                 goto restart;
1537         }
1538         spin_unlock_irqrestore(shost->host_lock, flags);
1539 }
1540
1541 /**
1542  * scsi_remove_target - try to remove a target and all its devices
1543  * @dev: generic starget or parent of generic stargets to be removed
1544  *
1545  * Note: This is slightly racy.  It is possible that if the user
1546  * requests the addition of another device then the target won't be
1547  * removed.
1548  */
1549 void scsi_remove_target(struct device *dev)
1550 {
1551         struct Scsi_Host *shost = dev_to_shost(dev->parent);
1552         struct scsi_target *starget;
1553         unsigned long flags;
1554
1555 restart:
1556         spin_lock_irqsave(shost->host_lock, flags);
1557         list_for_each_entry(starget, &shost->__targets, siblings) {
1558                 if (starget->state == STARGET_DEL ||
1559                     starget->state == STARGET_REMOVE ||
1560                     starget->state == STARGET_CREATED_REMOVE)
1561                         continue;
1562                 if (starget->dev.parent == dev || &starget->dev == dev) {
1563                         kref_get(&starget->reap_ref);
1564                         if (starget->state == STARGET_CREATED)
1565                                 starget->state = STARGET_CREATED_REMOVE;
1566                         else
1567                                 starget->state = STARGET_REMOVE;
1568                         spin_unlock_irqrestore(shost->host_lock, flags);
1569                         __scsi_remove_target(starget);
1570                         scsi_target_reap(starget);
1571                         goto restart;
1572                 }
1573         }
1574         spin_unlock_irqrestore(shost->host_lock, flags);
1575 }
1576 EXPORT_SYMBOL(scsi_remove_target);
1577
1578 int scsi_register_driver(struct device_driver *drv)
1579 {
1580         drv->bus = &scsi_bus_type;
1581
1582         return driver_register(drv);
1583 }
1584 EXPORT_SYMBOL(scsi_register_driver);
1585
1586 int scsi_register_interface(struct class_interface *intf)
1587 {
1588         intf->class = &sdev_class;
1589
1590         return class_interface_register(intf);
1591 }
1592 EXPORT_SYMBOL(scsi_register_interface);
1593
1594 /**
1595  * scsi_sysfs_add_host - add scsi host to subsystem
1596  * @shost:     scsi host struct to add to subsystem
1597  **/
1598 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1599 {
1600         transport_register_device(&shost->shost_gendev);
1601         transport_configure_device(&shost->shost_gendev);
1602         return 0;
1603 }
1604
1605 static struct device_type scsi_dev_type = {
1606         .name =         "scsi_device",
1607         .release =      scsi_device_dev_release,
1608         .groups =       scsi_sdev_attr_groups,
1609 };
1610
1611 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1612 {
1613         unsigned long flags;
1614         struct Scsi_Host *shost = sdev->host;
1615         struct scsi_host_template *hostt = shost->hostt;
1616         struct scsi_target  *starget = sdev->sdev_target;
1617
1618         device_initialize(&sdev->sdev_gendev);
1619         sdev->sdev_gendev.bus = &scsi_bus_type;
1620         sdev->sdev_gendev.type = &scsi_dev_type;
1621         scsi_enable_async_suspend(&sdev->sdev_gendev);
1622         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu",
1623                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1624         sdev->sdev_gendev.groups = hostt->sdev_groups;
1625
1626         device_initialize(&sdev->sdev_dev);
1627         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1628         sdev->sdev_dev.class = &sdev_class;
1629         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu",
1630                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1631         /*
1632          * Get a default scsi_level from the target (derived from sibling
1633          * devices).  This is the best we can do for guessing how to set
1634          * sdev->lun_in_cdb for the initial INQUIRY command.  For LUN 0 the
1635          * setting doesn't matter, because all the bits are zero anyway.
1636          * But it does matter for higher LUNs.
1637          */
1638         sdev->scsi_level = starget->scsi_level;
1639         if (sdev->scsi_level <= SCSI_2 &&
1640                         sdev->scsi_level != SCSI_UNKNOWN &&
1641                         !shost->no_scsi2_lun_in_cdb)
1642                 sdev->lun_in_cdb = 1;
1643
1644         transport_setup_device(&sdev->sdev_gendev);
1645         spin_lock_irqsave(shost->host_lock, flags);
1646         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1647         list_add_tail(&sdev->siblings, &shost->__devices);
1648         spin_unlock_irqrestore(shost->host_lock, flags);
1649         /*
1650          * device can now only be removed via __scsi_remove_device() so hold
1651          * the target.  Target will be held in CREATED state until something
1652          * beneath it becomes visible (in which case it moves to RUNNING)
1653          */
1654         kref_get(&starget->reap_ref);
1655 }
1656
1657 int scsi_is_sdev_device(const struct device *dev)
1658 {
1659         return dev->type == &scsi_dev_type;
1660 }
1661 EXPORT_SYMBOL(scsi_is_sdev_device);
1662
1663 /* A blank transport template that is used in drivers that don't
1664  * yet implement Transport Attributes */
1665 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };