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, "%hd\n");
 374 shost_rd_attr(sg_tablesize, "%hu\n");
 375 shost_rd_attr(sg_prot_tablesize, "%hu\n");
 376 shost_rd_attr(unchecked_isa_dma, "%d\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 struct attribute *scsi_sysfs_shost_attrs[] = {
 397         &dev_attr_use_blk_mq.attr,
 398         &dev_attr_unique_id.attr,
 399         &dev_attr_host_busy.attr,
 400         &dev_attr_cmd_per_lun.attr,
 401         &dev_attr_can_queue.attr,
 402         &dev_attr_sg_tablesize.attr,
 403         &dev_attr_sg_prot_tablesize.attr,
 404         &dev_attr_unchecked_isa_dma.attr,
 405         &dev_attr_proc_name.attr,
 406         &dev_attr_scan.attr,
 407         &dev_attr_hstate.attr,
 408         &dev_attr_supported_mode.attr,
 409         &dev_attr_active_mode.attr,
 410         &dev_attr_prot_capabilities.attr,
 411         &dev_attr_prot_guard_type.attr,
 412         &dev_attr_host_reset.attr,
 413         &dev_attr_eh_deadline.attr,
 414         NULL
 415 };
 416
 417 static struct attribute_group scsi_shost_attr_group = {
 418         .attrs =        scsi_sysfs_shost_attrs,
 419 };
 420
 421 const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
 422         &scsi_shost_attr_group,
 423         NULL
 424 };
 425
 426 static void scsi_device_cls_release(struct device *class_dev)
 427 {
 428         struct scsi_device *sdev;
 429
 430         sdev = class_to_sdev(class_dev);
 431         put_device(&sdev->sdev_gendev);
 432 }
 433
 434 static void scsi_device_dev_release_usercontext(struct work_struct *work)
 435 {
 436         struct scsi_device *sdev;
 437         struct device *parent;
 438         struct list_head *this, *tmp;
 439         struct scsi_vpd *vpd_pg80 = NULL, *vpd_pg83 = NULL;
 440         unsigned long flags;
 441
 442         sdev = container_of(work, struct scsi_device, ew.work);
 443
 444         scsi_dh_release_device(sdev);
 445
 446         parent = sdev->sdev_gendev.parent;
 447
 448         spin_lock_irqsave(sdev->host->host_lock, flags);
 449         list_del(&sdev->siblings);
 450         list_del(&sdev->same_target_siblings);
 451         list_del(&sdev->starved_entry);
 452         spin_unlock_irqrestore(sdev->host->host_lock, flags);
 453
 454         cancel_work_sync(&sdev->event_work);
 455
 456         list_for_each_safe(this, tmp, &sdev->event_list) {
 457                 struct scsi_event *evt;
 458
 459                 evt = list_entry(this, struct scsi_event, node);
 460                 list_del(&evt->node);
 461                 kfree(evt);
 462         }
 463
 464         blk_put_queue(sdev->request_queue);
 465         /* NULL queue means the device can't be used */
 466         sdev->request_queue = NULL;
 467
 468         mutex_lock(&sdev->inquiry_mutex);
 469         rcu_swap_protected(sdev->vpd_pg80, vpd_pg80,
 470                            lockdep_is_held(&sdev->inquiry_mutex));
 471         rcu_swap_protected(sdev->vpd_pg83, vpd_pg83,
 472                            lockdep_is_held(&sdev->inquiry_mutex));
 473         mutex_unlock(&sdev->inquiry_mutex);
 474
 475         if (vpd_pg83)
 476                 kfree_rcu(vpd_pg83, rcu);
 477         if (vpd_pg80)
 478                 kfree_rcu(vpd_pg80, rcu);
 479         kfree(sdev->inquiry);
 480         kfree(sdev);
 481
 482         if (parent)
 483                 put_device(parent);
 484 }
 485
 486 static void scsi_device_dev_release(struct device *dev)
 487 {
 488         struct scsi_device *sdp = to_scsi_device(dev);
 489         execute_in_process_context(scsi_device_dev_release_usercontext,
 490                                    &sdp->ew);
 491 }
 492
 493 static struct class sdev_class = {
 494         .name           = "scsi_device",
 495         .dev_release    = scsi_device_cls_release,
 496 };
 497
 498 /* all probing is done in the individual ->probe routines */
 499 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 500 {
 501         struct scsi_device *sdp;
 502
 503         if (dev->type != &scsi_dev_type)
 504                 return 0;
 505
 506         sdp = to_scsi_device(dev);
 507         if (sdp->no_uld_attach)
 508                 return 0;
 509         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 510 }
 511
 512 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 513 {
 514         struct scsi_device *sdev;
 515
 516         if (dev->type != &scsi_dev_type)
 517                 return 0;
 518
 519         sdev = to_scsi_device(dev);
 520
 521         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 522         return 0;
 523 }
 524
 525 struct bus_type scsi_bus_type = {
 526         .name           = "scsi",
 527         .match          = scsi_bus_match,
 528         .uevent         = scsi_bus_uevent,
 529 #ifdef CONFIG_PM
 530         .pm             = &scsi_bus_pm_ops,
 531 #endif
 532 };
 533 EXPORT_SYMBOL_GPL(scsi_bus_type);
 534
 535 int scsi_sysfs_register(void)
 536 {
 537         int error;
 538
 539         error = bus_register(&scsi_bus_type);
 540         if (!error) {
 541                 error = class_register(&sdev_class);
 542                 if (error)
 543                         bus_unregister(&scsi_bus_type);
 544         }
 545
 546         return error;
 547 }
 548
 549 void scsi_sysfs_unregister(void)
 550 {
 551         class_unregister(&sdev_class);
 552         bus_unregister(&scsi_bus_type);
 553 }
 554
 555 /*
 556  * sdev_show_function: macro to create an attr function that can be used to
 557  * show a non-bit field.
 558  */
 559 #define sdev_show_function(field, format_string)                                \
 560 static ssize_t                                                          \
 561 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 562                    char *buf)                                           \
 563 {                                                                       \
 564         struct scsi_device *sdev;                                       \
 565         sdev = to_scsi_device(dev);                                     \
 566         return snprintf (buf, 20, format_string, sdev->field);          \
 567 }                                                                       \
 568
 569 /*
 570  * sdev_rd_attr: macro to create a function and attribute variable for a
 571  * read only field.
 572  */
 573 #define sdev_rd_attr(field, format_string)                              \
 574         sdev_show_function(field, format_string)                        \
 575 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 576
 577
 578 /*
 579  * sdev_rw_attr: create a function and attribute variable for a
 580  * read/write field.
 581  */
 582 #define sdev_rw_attr(field, format_string)                              \
 583         sdev_show_function(field, format_string)                                \
 584                                                                         \
 585 static ssize_t                                                          \
 586 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 587                     const char *buf, size_t count)                      \
 588 {                                                                       \
 589         struct scsi_device *sdev;                                       \
 590         sdev = to_scsi_device(dev);                                     \
 591         sscanf (buf, format_string, &sdev->field);                      \
 592         return count;                                                   \
 593 }                                                                       \
 594 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 595
 596 /* Currently we don't export bit fields, but we might in future,
 597  * so leave this code in */
 598 #if 0
 599 /*
 600  * sdev_rd_attr: create a function and attribute variable for a
 601  * read/write bit field.
 602  */
 603 #define sdev_rw_attr_bit(field)                                         \
 604         sdev_show_function(field, "%d\n")                                       \
 605                                                                         \
 606 static ssize_t                                                          \
 607 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 608                     const char *buf, size_t count)                      \
 609 {                                                                       \
 610         int ret;                                                        \
 611         struct scsi_device *sdev;                                       \
 612         ret = scsi_sdev_check_buf_bit(buf);                             \
 613         if (ret >= 0)   {                                               \
 614                 sdev = to_scsi_device(dev);                             \
 615                 sdev->field = ret;                                      \
 616                 ret = count;                                            \
 617         }                                                               \
 618         return ret;                                                     \
 619 }                                                                       \
 620 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 621
 622 /*
 623  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 624  * else return -EINVAL.
 625  */
 626 static int scsi_sdev_check_buf_bit(const char *buf)
 627 {
 628         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 629                 if (buf[0] == '1')
 630                         return 1;
 631                 else if (buf[0] == '0')
 632                         return 0;
 633                 else
 634                         return -EINVAL;
 635         } else
 636                 return -EINVAL;
 637 }
 638 #endif
 639 /*
 640  * Create the actual show/store functions and data structures.
 641  */
 642 sdev_rd_attr (type, "%d\n");
 643 sdev_rd_attr (scsi_level, "%d\n");
 644 sdev_rd_attr (vendor, "%.8s\n");
 645 sdev_rd_attr (model, "%.16s\n");
 646 sdev_rd_attr (rev, "%.4s\n");
 647
 648 static ssize_t
 649 sdev_show_device_busy(struct device *dev, struct device_attribute *attr,
 650                 char *buf)
 651 {
 652         struct scsi_device *sdev = to_scsi_device(dev);
 653         return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_busy));
 654 }
 655 static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL);
 656
 657 static ssize_t
 658 sdev_show_device_blocked(struct device *dev, struct device_attribute *attr,
 659                 char *buf)
 660 {
 661         struct scsi_device *sdev = to_scsi_device(dev);
 662         return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_blocked));
 663 }
 664 static DEVICE_ATTR(device_blocked, S_IRUGO, sdev_show_device_blocked, NULL);
 665
 666 /*
 667  * TODO: can we make these symlinks to the block layer ones?
 668  */
 669 static ssize_t
 670 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 671 {
 672         struct scsi_device *sdev;
 673         sdev = to_scsi_device(dev);
 674         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
 675 }
 676
 677 static ssize_t
 678 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 679                     const char *buf, size_t count)
 680 {
 681         struct scsi_device *sdev;
 682         int timeout;
 683         sdev = to_scsi_device(dev);
 684         sscanf (buf, "%d\n", &timeout);
 685         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
 686         return count;
 687 }
 688 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 689
 690 static ssize_t
 691 sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 692 {
 693         struct scsi_device *sdev;
 694         sdev = to_scsi_device(dev);
 695         return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
 696 }
 697
 698 static ssize_t
 699 sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
 700                     const char *buf, size_t count)
 701 {
 702         struct scsi_device *sdev;
 703         unsigned int eh_timeout;
 704         int err;
 705
 706         if (!capable(CAP_SYS_ADMIN))
 707                 return -EACCES;
 708
 709         sdev = to_scsi_device(dev);
 710         err = kstrtouint(buf, 10, &eh_timeout);
 711         if (err)
 712                 return err;
 713         sdev->eh_timeout = eh_timeout * HZ;
 714
 715         return count;
 716 }
 717 static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
 718
 719 static ssize_t
 720 store_rescan_field (struct device *dev, struct device_attribute *attr,
 721                     const char *buf, size_t count)
 722 {
 723         scsi_rescan_device(dev);
 724         return count;
 725 }
 726 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 727
 728 static ssize_t
 729 sdev_store_delete(struct device *dev, struct device_attribute *attr,
 730                   const char *buf, size_t count)
 731 {
 732         struct kernfs_node *kn;
 733
 734         kn = sysfs_break_active_protection(&dev->kobj, &attr->attr);
 735         WARN_ON_ONCE(!kn);
 736         /*
 737          * Concurrent writes into the "delete" sysfs attribute may trigger
 738          * concurrent calls to device_remove_file() and scsi_remove_device().
 739          * device_remove_file() handles concurrent removal calls by
 740          * serializing these and by ignoring the second and later removal
 741          * attempts.  Concurrent calls of scsi_remove_device() are
 742          * serialized. The second and later calls of scsi_remove_device() are
 743          * ignored because the first call of that function changes the device
 744          * state into SDEV_DEL.
 745          */
 746         device_remove_file(dev, attr);
 747         scsi_remove_device(to_scsi_device(dev));
 748         if (kn)
 749                 sysfs_unbreak_active_protection(kn);
 750         return count;
 751 };
 752 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 753
 754 static ssize_t
 755 store_state_field(struct device *dev, struct device_attribute *attr,
 756                   const char *buf, size_t count)
 757 {
 758         int i, ret;
 759         struct scsi_device *sdev = to_scsi_device(dev);
 760         enum scsi_device_state state = 0;
 761
 762         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 763                 const int len = strlen(sdev_states[i].name);
 764                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 765                    buf[len] == '\n') {
 766                         state = sdev_states[i].value;
 767                         break;
 768                 }
 769         }
 770         if (!state)
 771                 return -EINVAL;
 772
 773         mutex_lock(&sdev->state_mutex);
 774         ret = scsi_device_set_state(sdev, state);
 775         /*
 776          * If the device state changes to SDEV_RUNNING, we need to run
 777          * the queue to avoid I/O hang.
 778          */
 779         if (ret == 0 && state == SDEV_RUNNING)
 780                 blk_mq_run_hw_queues(sdev->request_queue, true);
 781         mutex_unlock(&sdev->state_mutex);
 782
 783         return ret == 0 ? count : -EINVAL;
 784 }
 785
 786 static ssize_t
 787 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 788 {
 789         struct scsi_device *sdev = to_scsi_device(dev);
 790         const char *name = scsi_device_state_name(sdev->sdev_state);
 791
 792         if (!name)
 793                 return -EINVAL;
 794
 795         return snprintf(buf, 20, "%s\n", name);
 796 }
 797
 798 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 799
 800 static ssize_t
 801 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 802                       char *buf)
 803 {
 804         struct scsi_device *sdev = to_scsi_device(dev);
 805         const char *name = "none";
 806
 807         if (sdev->simple_tags)
 808                 name = "simple";
 809
 810         return snprintf(buf, 20, "%s\n", name);
 811 }
 812
 813 static ssize_t
 814 store_queue_type_field(struct device *dev, struct device_attribute *attr,
 815                        const char *buf, size_t count)
 816 {
 817         struct scsi_device *sdev = to_scsi_device(dev);
 818
 819         if (!sdev->tagged_supported)
 820                 return -EINVAL;
 821
 822         sdev_printk(KERN_INFO, sdev,
 823                     "ignoring write to deprecated queue_type attribute");
 824         return count;
 825 }
 826
 827 static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 828                    store_queue_type_field);
 829
 830 #define sdev_vpd_pg_attr(_page)                                         \
 831 static ssize_t                                                  \
 832 show_vpd_##_page(struct file *filp, struct kobject *kobj,       \
 833                  struct bin_attribute *bin_attr,                        \
 834                  char *buf, loff_t off, size_t count)                   \
 835 {                                                                       \
 836         struct device *dev = container_of(kobj, struct device, kobj);   \
 837         struct scsi_device *sdev = to_scsi_device(dev);                 \
 838         struct scsi_vpd *vpd_page;                                      \
 839         int ret = -EINVAL;                                              \
 840                                                                         \
 841         rcu_read_lock();                                                \
 842         vpd_page = rcu_dereference(sdev->vpd_##_page);                  \
 843         if (vpd_page)                                                   \
 844                 ret = memory_read_from_buffer(buf, count, &off,         \
 845                                 vpd_page->data, vpd_page->len);         \
 846         rcu_read_unlock();                                              \
 847         return ret;                                                     \
 848 }                                                                       \
 849 static struct bin_attribute dev_attr_vpd_##_page = {            \
 850         .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO },   \
 851         .size = 0,                                                      \
 852         .read = show_vpd_##_page,                                       \
 853 };
 854
 855 sdev_vpd_pg_attr(pg83);
 856 sdev_vpd_pg_attr(pg80);
 857
 858 static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
 859                             struct bin_attribute *bin_attr,
 860                             char *buf, loff_t off, size_t count)
 861 {
 862         struct device *dev = container_of(kobj, struct device, kobj);
 863         struct scsi_device *sdev = to_scsi_device(dev);
 864
 865         if (!sdev->inquiry)
 866                 return -EINVAL;
 867
 868         return memory_read_from_buffer(buf, count, &off, sdev->inquiry,
 869                                        sdev->inquiry_len);
 870 }
 871
 872 static struct bin_attribute dev_attr_inquiry = {
 873         .attr = {
 874                 .name = "inquiry",
 875                 .mode = S_IRUGO,
 876         },
 877         .size = 0,
 878         .read = show_inquiry,
 879 };
 880
 881 static ssize_t
 882 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
 883                         char *buf)
 884 {
 885         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 886 }
 887
 888 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 889
 890 #define show_sdev_iostat(field)                                         \
 891 static ssize_t                                                          \
 892 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 893                     char *buf)                                          \
 894 {                                                                       \
 895         struct scsi_device *sdev = to_scsi_device(dev);                 \
 896         unsigned long long count = atomic_read(&sdev->field);           \
 897         return snprintf(buf, 20, "0x%llx\n", count);                    \
 898 }                                                                       \
 899 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 900
 901 show_sdev_iostat(iorequest_cnt);
 902 show_sdev_iostat(iodone_cnt);
 903 show_sdev_iostat(ioerr_cnt);
 904
 905 static ssize_t
 906 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 907 {
 908         struct scsi_device *sdev;
 909         sdev = to_scsi_device(dev);
 910         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 911 }
 912 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 913
 914 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 915 static ssize_t                                                          \
 916 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 917                      char *buf)                                         \
 918 {                                                                       \
 919         struct scsi_device *sdev = to_scsi_device(dev);                 \
 920         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 921         return snprintf(buf, 20, "%d\n", val);                          \
 922 }
 923
 924 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 925 static ssize_t                                                          \
 926 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 927                       const char *buf, size_t count)                    \
 928 {                                                                       \
 929         struct scsi_device *sdev = to_scsi_device(dev);                 \
 930         int val = simple_strtoul(buf, NULL, 0);                         \
 931         if (val == 0)                                                   \
 932                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 933         else if (val == 1)                                              \
 934                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 935         else                                                            \
 936                 return -EINVAL;                                         \
 937         return count;                                                   \
 938 }
 939
 940 #define DECLARE_EVT(name, Cap_name)                                     \
 941         DECLARE_EVT_SHOW(name, Cap_name)                                \
 942         DECLARE_EVT_STORE(name, Cap_name)                               \
 943         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 944                            sdev_store_evt_##name);
 945 #define REF_EVT(name) &dev_attr_evt_##name.attr
 946
 947 DECLARE_EVT(media_change, MEDIA_CHANGE)
 948 DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
 949 DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
 950 DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
 951 DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
 952 DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
 953
 954 static ssize_t
 955 sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
 956                        const char *buf, size_t count)
 957 {
 958         int depth, retval;
 959         struct scsi_device *sdev = to_scsi_device(dev);
 960         struct scsi_host_template *sht = sdev->host->hostt;
 961
 962         if (!sht->change_queue_depth)
 963                 return -EINVAL;
 964
 965         depth = simple_strtoul(buf, NULL, 0);
 966
 967         if (depth < 1 || depth > sdev->host->can_queue)
 968                 return -EINVAL;
 969
 970         retval = sht->change_queue_depth(sdev, depth);
 971         if (retval < 0)
 972                 return retval;
 973
 974         sdev->max_queue_depth = sdev->queue_depth;
 975
 976         return count;
 977 }
 978 sdev_show_function(queue_depth, "%d\n");
 979
 980 static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 981                    sdev_store_queue_depth);
 982
 983 static ssize_t
 984 sdev_show_wwid(struct device *dev, struct device_attribute *attr,
 985                     char *buf)
 986 {
 987         struct scsi_device *sdev = to_scsi_device(dev);
 988         ssize_t count;
 989
 990         count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
 991         if (count > 0) {
 992                 buf[count] = '\n';
 993                 count++;
 994         }
 995         return count;
 996 }
 997 static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
 998
 999 #define BLIST_FLAG_NAME(name)                                   \
1000         [const_ilog2((__force __u64)BLIST_##name)] = #name
1001 static const char *const sdev_bflags_name[] = {
1002 #include "scsi_devinfo_tbl.c"
1003 };
1004 #undef BLIST_FLAG_NAME
1005
1006 static ssize_t
1007 sdev_show_blacklist(struct device *dev, struct device_attribute *attr,
1008                     char *buf)
1009 {
1010         struct scsi_device *sdev = to_scsi_device(dev);
1011         int i;
1012         ssize_t len = 0;
1013
1014         for (i = 0; i < sizeof(sdev->sdev_bflags) * BITS_PER_BYTE; i++) {
1015                 const char *name = NULL;
1016
1017                 if (!(sdev->sdev_bflags & (__force blist_flags_t)BIT(i)))
1018                         continue;
1019                 if (i < ARRAY_SIZE(sdev_bflags_name) && sdev_bflags_name[i])
1020                         name = sdev_bflags_name[i];
1021
1022                 if (name)
1023                         len += snprintf(buf + len, PAGE_SIZE - len,
1024                                         "%s%s", len ? " " : "", name);
1025                 else
1026                         len += snprintf(buf + len, PAGE_SIZE - len,
1027                                         "%sINVALID_BIT(%d)", len ? " " : "", i);
1028         }
1029         if (len)
1030                 len += snprintf(buf + len, PAGE_SIZE - len, "\n");
1031         return len;
1032 }
1033 static DEVICE_ATTR(blacklist, S_IRUGO, sdev_show_blacklist, NULL);
1034
1035 #ifdef CONFIG_SCSI_DH
1036 static ssize_t
1037 sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
1038                    char *buf)
1039 {
1040         struct scsi_device *sdev = to_scsi_device(dev);
1041
1042         if (!sdev->handler)
1043                 return snprintf(buf, 20, "detached\n");
1044
1045         return snprintf(buf, 20, "%s\n", sdev->handler->name);
1046 }
1047
1048 static ssize_t
1049 sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
1050                     const char *buf, size_t count)
1051 {
1052         struct scsi_device *sdev = to_scsi_device(dev);
1053         int err = -EINVAL;
1054
1055         if (sdev->sdev_state == SDEV_CANCEL ||
1056             sdev->sdev_state == SDEV_DEL)
1057                 return -ENODEV;
1058
1059         if (!sdev->handler) {
1060                 /*
1061                  * Attach to a device handler
1062                  */
1063                 err = scsi_dh_attach(sdev->request_queue, buf);
1064         } else if (!strncmp(buf, "activate", 8)) {
1065                 /*
1066                  * Activate a device handler
1067                  */
1068                 if (sdev->handler->activate)
1069                         err = sdev->handler->activate(sdev, NULL, NULL);
1070                 else
1071                         err = 0;
1072         } else if (!strncmp(buf, "detach", 6)) {
1073                 /*
1074                  * Detach from a device handler
1075                  */
1076                 sdev_printk(KERN_WARNING, sdev,
1077                             "can't detach handler %s.\n",
1078                             sdev->handler->name);
1079                 err = -EINVAL;
1080         }
1081
1082         return err < 0 ? err : count;
1083 }
1084
1085 static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
1086                    sdev_store_dh_state);
1087
1088 static ssize_t
1089 sdev_show_access_state(struct device *dev,
1090                        struct device_attribute *attr,
1091                        char *buf)
1092 {
1093         struct scsi_device *sdev = to_scsi_device(dev);
1094         unsigned char access_state;
1095         const char *access_state_name;
1096
1097         if (!sdev->handler)
1098                 return -EINVAL;
1099
1100         access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK);
1101         access_state_name = scsi_access_state_name(access_state);
1102
1103         return sprintf(buf, "%s\n",
1104                        access_state_name ? access_state_name : "unknown");
1105 }
1106 static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL);
1107
1108 static ssize_t
1109 sdev_show_preferred_path(struct device *dev,
1110                          struct device_attribute *attr,
1111                          char *buf)
1112 {
1113         struct scsi_device *sdev = to_scsi_device(dev);
1114
1115         if (!sdev->handler)
1116                 return -EINVAL;
1117
1118         if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED)
1119                 return sprintf(buf, "1\n");
1120         else
1121                 return sprintf(buf, "0\n");
1122 }
1123 static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL);
1124 #endif
1125
1126 static ssize_t
1127 sdev_show_queue_ramp_up_period(struct device *dev,
1128                                struct device_attribute *attr,
1129                                char *buf)
1130 {
1131         struct scsi_device *sdev;
1132         sdev = to_scsi_device(dev);
1133         return snprintf(buf, 20, "%u\n",
1134                         jiffies_to_msecs(sdev->queue_ramp_up_period));
1135 }
1136
1137 static ssize_t
1138 sdev_store_queue_ramp_up_period(struct device *dev,
1139                                 struct device_attribute *attr,
1140                                 const char *buf, size_t count)
1141 {
1142         struct scsi_device *sdev = to_scsi_device(dev);
1143         unsigned int period;
1144
1145         if (kstrtouint(buf, 10, &period))
1146                 return -EINVAL;
1147
1148         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
1149         return count;
1150 }
1151
1152 static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
1153                    sdev_show_queue_ramp_up_period,
1154                    sdev_store_queue_ramp_up_period);
1155
1156 static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
1157                                          struct attribute *attr, int i)
1158 {
1159         struct device *dev = container_of(kobj, struct device, kobj);
1160         struct scsi_device *sdev = to_scsi_device(dev);
1161
1162
1163         if (attr == &dev_attr_queue_depth.attr &&
1164             !sdev->host->hostt->change_queue_depth)
1165                 return S_IRUGO;
1166
1167         if (attr == &dev_attr_queue_ramp_up_period.attr &&
1168             !sdev->host->hostt->change_queue_depth)
1169                 return 0;
1170
1171 #ifdef CONFIG_SCSI_DH
1172         if (attr == &dev_attr_access_state.attr &&
1173             !sdev->handler)
1174                 return 0;
1175         if (attr == &dev_attr_preferred_path.attr &&
1176             !sdev->handler)
1177                 return 0;
1178 #endif
1179         return attr->mode;
1180 }
1181
1182 static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
1183                                              struct bin_attribute *attr, int i)
1184 {
1185         struct device *dev = container_of(kobj, struct device, kobj);
1186         struct scsi_device *sdev = to_scsi_device(dev);
1187
1188
1189         if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80)
1190                 return 0;
1191
1192         if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83)
1193                 return 0;
1194
1195         return S_IRUGO;
1196 }
1197
1198 /* Default template for device attributes.  May NOT be modified */
1199 static struct attribute *scsi_sdev_attrs[] = {
1200         &dev_attr_device_blocked.attr,
1201         &dev_attr_type.attr,
1202         &dev_attr_scsi_level.attr,
1203         &dev_attr_device_busy.attr,
1204         &dev_attr_vendor.attr,
1205         &dev_attr_model.attr,
1206         &dev_attr_rev.attr,
1207         &dev_attr_rescan.attr,
1208         &dev_attr_delete.attr,
1209         &dev_attr_state.attr,
1210         &dev_attr_timeout.attr,
1211         &dev_attr_eh_timeout.attr,
1212         &dev_attr_iocounterbits.attr,
1213         &dev_attr_iorequest_cnt.attr,
1214         &dev_attr_iodone_cnt.attr,
1215         &dev_attr_ioerr_cnt.attr,
1216         &dev_attr_modalias.attr,
1217         &dev_attr_queue_depth.attr,
1218         &dev_attr_queue_type.attr,
1219         &dev_attr_wwid.attr,
1220         &dev_attr_blacklist.attr,
1221 #ifdef CONFIG_SCSI_DH
1222         &dev_attr_dh_state.attr,
1223         &dev_attr_access_state.attr,
1224         &dev_attr_preferred_path.attr,
1225 #endif
1226         &dev_attr_queue_ramp_up_period.attr,
1227         REF_EVT(media_change),
1228         REF_EVT(inquiry_change_reported),
1229         REF_EVT(capacity_change_reported),
1230         REF_EVT(soft_threshold_reached),
1231         REF_EVT(mode_parameter_change_reported),
1232         REF_EVT(lun_change_reported),
1233         NULL
1234 };
1235
1236 static struct bin_attribute *scsi_sdev_bin_attrs[] = {
1237         &dev_attr_vpd_pg83,
1238         &dev_attr_vpd_pg80,
1239         &dev_attr_inquiry,
1240         NULL
1241 };
1242 static struct attribute_group scsi_sdev_attr_group = {
1243         .attrs =        scsi_sdev_attrs,
1244         .bin_attrs =    scsi_sdev_bin_attrs,
1245         .is_visible =   scsi_sdev_attr_is_visible,
1246         .is_bin_visible = scsi_sdev_bin_attr_is_visible,
1247 };
1248
1249 static const struct attribute_group *scsi_sdev_attr_groups[] = {
1250         &scsi_sdev_attr_group,
1251         NULL
1252 };
1253
1254 static int scsi_target_add(struct scsi_target *starget)
1255 {
1256         int error;
1257
1258         if (starget->state != STARGET_CREATED)
1259                 return 0;
1260
1261         error = device_add(&starget->dev);
1262         if (error) {
1263                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
1264                 return error;
1265         }
1266         transport_add_device(&starget->dev);
1267         starget->state = STARGET_RUNNING;
1268
1269         pm_runtime_set_active(&starget->dev);
1270         pm_runtime_enable(&starget->dev);
1271         device_enable_async_suspend(&starget->dev);
1272
1273         return 0;
1274 }
1275
1276 /**
1277  * scsi_sysfs_add_sdev - add scsi device to sysfs
1278  * @sdev:       scsi_device to add
1279  *
1280  * Return value:
1281  *      0 on Success / non-zero on Failure
1282  **/
1283 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1284 {
1285         int error, i;
1286         struct request_queue *rq = sdev->request_queue;
1287         struct scsi_target *starget = sdev->sdev_target;
1288
1289         error = scsi_target_add(starget);
1290         if (error)
1291                 return error;
1292
1293         transport_configure_device(&starget->dev);
1294
1295         device_enable_async_suspend(&sdev->sdev_gendev);
1296         scsi_autopm_get_target(starget);
1297         pm_runtime_set_active(&sdev->sdev_gendev);
1298         pm_runtime_forbid(&sdev->sdev_gendev);
1299         pm_runtime_enable(&sdev->sdev_gendev);
1300         scsi_autopm_put_target(starget);
1301
1302         scsi_autopm_get_device(sdev);
1303
1304         scsi_dh_add_device(sdev);
1305
1306         error = device_add(&sdev->sdev_gendev);
1307         if (error) {
1308                 sdev_printk(KERN_INFO, sdev,
1309                                 "failed to add device: %d\n", error);
1310                 return error;
1311         }
1312
1313         device_enable_async_suspend(&sdev->sdev_dev);
1314         error = device_add(&sdev->sdev_dev);
1315         if (error) {
1316                 sdev_printk(KERN_INFO, sdev,
1317                                 "failed to add class device: %d\n", error);
1318                 device_del(&sdev->sdev_gendev);
1319                 return error;
1320         }
1321         transport_add_device(&sdev->sdev_gendev);
1322         sdev->is_visible = 1;
1323
1324         error = bsg_scsi_register_queue(rq, &sdev->sdev_gendev);
1325         if (error)
1326                 /* we're treating error on bsg register as non-fatal,
1327                  * so pretend nothing went wrong */
1328                 sdev_printk(KERN_INFO, sdev,
1329                             "Failed to register bsg queue, errno=%d\n", error);
1330
1331         /* add additional host specific attributes */
1332         if (sdev->host->hostt->sdev_attrs) {
1333                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
1334                         error = device_create_file(&sdev->sdev_gendev,
1335                                         sdev->host->hostt->sdev_attrs[i]);
1336                         if (error)
1337                                 return error;
1338                 }
1339         }
1340
1341         if (sdev->host->hostt->sdev_groups) {
1342                 error = sysfs_create_groups(&sdev->sdev_gendev.kobj,
1343                                 sdev->host->hostt->sdev_groups);
1344                 if (error)
1345                         return error;
1346         }
1347
1348         scsi_autopm_put_device(sdev);
1349         return error;
1350 }
1351
1352 void __scsi_remove_device(struct scsi_device *sdev)
1353 {
1354         struct device *dev = &sdev->sdev_gendev;
1355         int res;
1356
1357         /*
1358          * This cleanup path is not reentrant and while it is impossible
1359          * to get a new reference with scsi_device_get() someone can still
1360          * hold a previously acquired one.
1361          */
1362         if (sdev->sdev_state == SDEV_DEL)
1363                 return;
1364
1365         if (sdev->is_visible) {
1366                 /*
1367                  * If scsi_internal_target_block() is running concurrently,
1368                  * wait until it has finished before changing the device state.
1369                  */
1370                 mutex_lock(&sdev->state_mutex);
1371                 /*
1372                  * If blocked, we go straight to DEL and restart the queue so
1373                  * any commands issued during driver shutdown (like sync
1374                  * cache) are errored immediately.
1375                  */
1376                 res = scsi_device_set_state(sdev, SDEV_CANCEL);
1377                 if (res != 0) {
1378                         res = scsi_device_set_state(sdev, SDEV_DEL);
1379                         if (res == 0)
1380                                 scsi_start_queue(sdev);
1381                 }
1382                 mutex_unlock(&sdev->state_mutex);
1383
1384                 if (res != 0)
1385                         return;
1386
1387                 if (sdev->host->hostt->sdev_groups)
1388                         sysfs_remove_groups(&sdev->sdev_gendev.kobj,
1389                                         sdev->host->hostt->sdev_groups);
1390
1391                 bsg_unregister_queue(sdev->request_queue);
1392                 device_unregister(&sdev->sdev_dev);
1393                 transport_remove_device(dev);
1394                 device_del(dev);
1395         } else
1396                 put_device(&sdev->sdev_dev);
1397
1398         /*
1399          * Stop accepting new requests and wait until all queuecommand() and
1400          * scsi_run_queue() invocations have finished before tearing down the
1401          * device.
1402          */
1403         mutex_lock(&sdev->state_mutex);
1404         scsi_device_set_state(sdev, SDEV_DEL);
1405         mutex_unlock(&sdev->state_mutex);
1406
1407         blk_cleanup_queue(sdev->request_queue);
1408         cancel_work_sync(&sdev->requeue_work);
1409
1410         if (sdev->host->hostt->slave_destroy)
1411                 sdev->host->hostt->slave_destroy(sdev);
1412         transport_destroy_device(dev);
1413
1414         /*
1415          * Paired with the kref_get() in scsi_sysfs_initialize().  We have
1416          * remoed sysfs visibility from the device, so make the target
1417          * invisible if this was the last device underneath it.
1418          */
1419         scsi_target_reap(scsi_target(sdev));
1420
1421         put_device(dev);
1422 }
1423
1424 /**
1425  * scsi_remove_device - unregister a device from the scsi bus
1426  * @sdev:       scsi_device to unregister
1427  **/
1428 void scsi_remove_device(struct scsi_device *sdev)
1429 {
1430         struct Scsi_Host *shost = sdev->host;
1431
1432         mutex_lock(&shost->scan_mutex);
1433         __scsi_remove_device(sdev);
1434         mutex_unlock(&shost->scan_mutex);
1435 }
1436 EXPORT_SYMBOL(scsi_remove_device);
1437
1438 static void __scsi_remove_target(struct scsi_target *starget)
1439 {
1440         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1441         unsigned long flags;
1442         struct scsi_device *sdev;
1443
1444         spin_lock_irqsave(shost->host_lock, flags);
1445  restart:
1446         list_for_each_entry(sdev, &shost->__devices, siblings) {
1447                 /*
1448                  * We cannot call scsi_device_get() here, as
1449                  * we might've been called from rmmod() causing
1450                  * scsi_device_get() to fail the module_is_live()
1451                  * check.
1452                  */
1453                 if (sdev->channel != starget->channel ||
1454                     sdev->id != starget->id)
1455                         continue;
1456                 if (sdev->sdev_state == SDEV_DEL ||
1457                     sdev->sdev_state == SDEV_CANCEL ||
1458                     !get_device(&sdev->sdev_gendev))
1459                         continue;
1460                 spin_unlock_irqrestore(shost->host_lock, flags);
1461                 scsi_remove_device(sdev);
1462                 put_device(&sdev->sdev_gendev);
1463                 spin_lock_irqsave(shost->host_lock, flags);
1464                 goto restart;
1465         }
1466         spin_unlock_irqrestore(shost->host_lock, flags);
1467 }
1468
1469 /**
1470  * scsi_remove_target - try to remove a target and all its devices
1471  * @dev: generic starget or parent of generic stargets to be removed
1472  *
1473  * Note: This is slightly racy.  It is possible that if the user
1474  * requests the addition of another device then the target won't be
1475  * removed.
1476  */
1477 void scsi_remove_target(struct device *dev)
1478 {
1479         struct Scsi_Host *shost = dev_to_shost(dev->parent);
1480         struct scsi_target *starget;
1481         unsigned long flags;
1482
1483 restart:
1484         spin_lock_irqsave(shost->host_lock, flags);
1485         list_for_each_entry(starget, &shost->__targets, siblings) {
1486                 if (starget->state == STARGET_DEL ||
1487                     starget->state == STARGET_REMOVE ||
1488                     starget->state == STARGET_CREATED_REMOVE)
1489                         continue;
1490                 if (starget->dev.parent == dev || &starget->dev == dev) {
1491                         kref_get(&starget->reap_ref);
1492                         if (starget->state == STARGET_CREATED)
1493                                 starget->state = STARGET_CREATED_REMOVE;
1494                         else
1495                                 starget->state = STARGET_REMOVE;
1496                         spin_unlock_irqrestore(shost->host_lock, flags);
1497                         __scsi_remove_target(starget);
1498                         scsi_target_reap(starget);
1499                         goto restart;
1500                 }
1501         }
1502         spin_unlock_irqrestore(shost->host_lock, flags);
1503 }
1504 EXPORT_SYMBOL(scsi_remove_target);
1505
1506 int scsi_register_driver(struct device_driver *drv)
1507 {
1508         drv->bus = &scsi_bus_type;
1509
1510         return driver_register(drv);
1511 }
1512 EXPORT_SYMBOL(scsi_register_driver);
1513
1514 int scsi_register_interface(struct class_interface *intf)
1515 {
1516         intf->class = &sdev_class;
1517
1518         return class_interface_register(intf);
1519 }
1520 EXPORT_SYMBOL(scsi_register_interface);
1521
1522 /**
1523  * scsi_sysfs_add_host - add scsi host to subsystem
1524  * @shost:     scsi host struct to add to subsystem
1525  **/
1526 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1527 {
1528         int error, i;
1529
1530         /* add host specific attributes */
1531         if (shost->hostt->shost_attrs) {
1532                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1533                         error = device_create_file(&shost->shost_dev,
1534                                         shost->hostt->shost_attrs[i]);
1535                         if (error)
1536                                 return error;
1537                 }
1538         }
1539
1540         transport_register_device(&shost->shost_gendev);
1541         transport_configure_device(&shost->shost_gendev);
1542         return 0;
1543 }
1544
1545 static struct device_type scsi_dev_type = {
1546         .name =         "scsi_device",
1547         .release =      scsi_device_dev_release,
1548         .groups =       scsi_sdev_attr_groups,
1549 };
1550
1551 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1552 {
1553         unsigned long flags;
1554         struct Scsi_Host *shost = sdev->host;
1555         struct scsi_target  *starget = sdev->sdev_target;
1556
1557         device_initialize(&sdev->sdev_gendev);
1558         sdev->sdev_gendev.bus = &scsi_bus_type;
1559         sdev->sdev_gendev.type = &scsi_dev_type;
1560         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu",
1561                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1562
1563         device_initialize(&sdev->sdev_dev);
1564         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1565         sdev->sdev_dev.class = &sdev_class;
1566         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu",
1567                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1568         /*
1569          * Get a default scsi_level from the target (derived from sibling
1570          * devices).  This is the best we can do for guessing how to set
1571          * sdev->lun_in_cdb for the initial INQUIRY command.  For LUN 0 the
1572          * setting doesn't matter, because all the bits are zero anyway.
1573          * But it does matter for higher LUNs.
1574          */
1575         sdev->scsi_level = starget->scsi_level;
1576         if (sdev->scsi_level <= SCSI_2 &&
1577                         sdev->scsi_level != SCSI_UNKNOWN &&
1578                         !shost->no_scsi2_lun_in_cdb)
1579                 sdev->lun_in_cdb = 1;
1580
1581         transport_setup_device(&sdev->sdev_gendev);
1582         spin_lock_irqsave(shost->host_lock, flags);
1583         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1584         list_add_tail(&sdev->siblings, &shost->__devices);
1585         spin_unlock_irqrestore(shost->host_lock, flags);
1586         /*
1587          * device can now only be removed via __scsi_remove_device() so hold
1588          * the target.  Target will be held in CREATED state until something
1589          * beneath it becomes visible (in which case it moves to RUNNING)
1590          */
1591         kref_get(&starget->reap_ref);
1592 }
1593
1594 int scsi_is_sdev_device(const struct device *dev)
1595 {
1596         return dev->type == &scsi_dev_type;
1597 }
1598 EXPORT_SYMBOL(scsi_is_sdev_device);
1599
1600 /* A blank transport template that is used in drivers that don't
1601  * yet implement Transport Attributes */
1602 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };