drivers/scsi/scsi_sysfs.c

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