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