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", atomic_read(&shost->host_busy));
 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         if (device_remove_file_self(dev, attr))
 726                 scsi_remove_device(to_scsi_device(dev));
 727         return count;
 728 };
 729 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 730
 731 static ssize_t
 732 store_state_field(struct device *dev, struct device_attribute *attr,
 733                   const char *buf, size_t count)
 734 {
 735         int i, ret;
 736         struct scsi_device *sdev = to_scsi_device(dev);
 737         enum scsi_device_state state = 0;
 738
 739         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 740                 const int len = strlen(sdev_states[i].name);
 741                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 742                    buf[len] == '\n') {
 743                         state = sdev_states[i].value;
 744                         break;
 745                 }
 746         }
 747         if (!state)
 748                 return -EINVAL;
 749
 750         mutex_lock(&sdev->state_mutex);
 751         ret = scsi_device_set_state(sdev, state);
 752         mutex_unlock(&sdev->state_mutex);
 753
 754         return ret == 0 ? count : -EINVAL;
 755 }
 756
 757 static ssize_t
 758 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 759 {
 760         struct scsi_device *sdev = to_scsi_device(dev);
 761         const char *name = scsi_device_state_name(sdev->sdev_state);
 762
 763         if (!name)
 764                 return -EINVAL;
 765
 766         return snprintf(buf, 20, "%s\n", name);
 767 }
 768
 769 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 770
 771 static ssize_t
 772 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 773                       char *buf)
 774 {
 775         struct scsi_device *sdev = to_scsi_device(dev);
 776         const char *name = "none";
 777
 778         if (sdev->simple_tags)
 779                 name = "simple";
 780
 781         return snprintf(buf, 20, "%s\n", name);
 782 }
 783
 784 static ssize_t
 785 store_queue_type_field(struct device *dev, struct device_attribute *attr,
 786                        const char *buf, size_t count)
 787 {
 788         struct scsi_device *sdev = to_scsi_device(dev);
 789
 790         if (!sdev->tagged_supported)
 791                 return -EINVAL;
 792
 793         sdev_printk(KERN_INFO, sdev,
 794                     "ignoring write to deprecated queue_type attribute");
 795         return count;
 796 }
 797
 798 static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 799                    store_queue_type_field);
 800
 801 #define sdev_vpd_pg_attr(_page)                                         \
 802 static ssize_t                                                  \
 803 show_vpd_##_page(struct file *filp, struct kobject *kobj,       \
 804                  struct bin_attribute *bin_attr,                        \
 805                  char *buf, loff_t off, size_t count)                   \
 806 {                                                                       \
 807         struct device *dev = container_of(kobj, struct device, kobj);   \
 808         struct scsi_device *sdev = to_scsi_device(dev);                 \
 809         struct scsi_vpd *vpd_page;                                      \
 810         int ret = -EINVAL;                                              \
 811                                                                         \
 812         rcu_read_lock();                                                \
 813         vpd_page = rcu_dereference(sdev->vpd_##_page);                  \
 814         if (vpd_page)                                                   \
 815                 ret = memory_read_from_buffer(buf, count, &off,         \
 816                                 vpd_page->data, vpd_page->len);         \
 817         rcu_read_unlock();                                              \
 818         return ret;                                                     \
 819 }                                                                       \
 820 static struct bin_attribute dev_attr_vpd_##_page = {            \
 821         .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO },   \
 822         .size = 0,                                                      \
 823         .read = show_vpd_##_page,                                       \
 824 };
 825
 826 sdev_vpd_pg_attr(pg83);
 827 sdev_vpd_pg_attr(pg80);
 828
 829 static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
 830                             struct bin_attribute *bin_attr,
 831                             char *buf, loff_t off, size_t count)
 832 {
 833         struct device *dev = container_of(kobj, struct device, kobj);
 834         struct scsi_device *sdev = to_scsi_device(dev);
 835
 836         if (!sdev->inquiry)
 837                 return -EINVAL;
 838
 839         return memory_read_from_buffer(buf, count, &off, sdev->inquiry,
 840                                        sdev->inquiry_len);
 841 }
 842
 843 static struct bin_attribute dev_attr_inquiry = {
 844         .attr = {
 845                 .name = "inquiry",
 846                 .mode = S_IRUGO,
 847         },
 848         .size = 0,
 849         .read = show_inquiry,
 850 };
 851
 852 static ssize_t
 853 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
 854                         char *buf)
 855 {
 856         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 857 }
 858
 859 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 860
 861 #define show_sdev_iostat(field)                                         \
 862 static ssize_t                                                          \
 863 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 864                     char *buf)                                          \
 865 {                                                                       \
 866         struct scsi_device *sdev = to_scsi_device(dev);                 \
 867         unsigned long long count = atomic_read(&sdev->field);           \
 868         return snprintf(buf, 20, "0x%llx\n", count);                    \
 869 }                                                                       \
 870 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 871
 872 show_sdev_iostat(iorequest_cnt);
 873 show_sdev_iostat(iodone_cnt);
 874 show_sdev_iostat(ioerr_cnt);
 875
 876 static ssize_t
 877 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 878 {
 879         struct scsi_device *sdev;
 880         sdev = to_scsi_device(dev);
 881         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 882 }
 883 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 884
 885 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 886 static ssize_t                                                          \
 887 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 888                      char *buf)                                         \
 889 {                                                                       \
 890         struct scsi_device *sdev = to_scsi_device(dev);                 \
 891         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 892         return snprintf(buf, 20, "%d\n", val);                          \
 893 }
 894
 895 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 896 static ssize_t                                                          \
 897 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 898                       const char *buf, size_t count)                    \
 899 {                                                                       \
 900         struct scsi_device *sdev = to_scsi_device(dev);                 \
 901         int val = simple_strtoul(buf, NULL, 0);                         \
 902         if (val == 0)                                                   \
 903                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 904         else if (val == 1)                                              \
 905                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 906         else                                                            \
 907                 return -EINVAL;                                         \
 908         return count;                                                   \
 909 }
 910
 911 #define DECLARE_EVT(name, Cap_name)                                     \
 912         DECLARE_EVT_SHOW(name, Cap_name)                                \
 913         DECLARE_EVT_STORE(name, Cap_name)                               \
 914         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 915                            sdev_store_evt_##name);
 916 #define REF_EVT(name) &dev_attr_evt_##name.attr
 917
 918 DECLARE_EVT(media_change, MEDIA_CHANGE)
 919 DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
 920 DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
 921 DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
 922 DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
 923 DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
 924
 925 static ssize_t
 926 sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
 927                        const char *buf, size_t count)
 928 {
 929         int depth, retval;
 930         struct scsi_device *sdev = to_scsi_device(dev);
 931         struct scsi_host_template *sht = sdev->host->hostt;
 932
 933         if (!sht->change_queue_depth)
 934                 return -EINVAL;
 935
 936         depth = simple_strtoul(buf, NULL, 0);
 937
 938         if (depth < 1 || depth > sdev->host->can_queue)
 939                 return -EINVAL;
 940
 941         retval = sht->change_queue_depth(sdev, depth);
 942         if (retval < 0)
 943                 return retval;
 944
 945         sdev->max_queue_depth = sdev->queue_depth;
 946
 947         return count;
 948 }
 949 sdev_show_function(queue_depth, "%d\n");
 950
 951 static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 952                    sdev_store_queue_depth);
 953
 954 static ssize_t
 955 sdev_show_wwid(struct device *dev, struct device_attribute *attr,
 956                     char *buf)
 957 {
 958         struct scsi_device *sdev = to_scsi_device(dev);
 959         ssize_t count;
 960
 961         count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
 962         if (count > 0) {
 963                 buf[count] = '\n';
 964                 count++;
 965         }
 966         return count;
 967 }
 968 static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
 969
 970 #define BLIST_FLAG_NAME(name) [ilog2(BLIST_##name)] = #name
 971 static const char *const sdev_bflags_name[] = {
 972 #include "scsi_devinfo_tbl.c"
 973 };
 974 #undef BLIST_FLAG_NAME
 975
 976 static ssize_t
 977 sdev_show_blacklist(struct device *dev, struct device_attribute *attr,
 978                     char *buf)
 979 {
 980         struct scsi_device *sdev = to_scsi_device(dev);
 981         int i;
 982         ssize_t len = 0;
 983
 984         for (i = 0; i < sizeof(sdev->sdev_bflags) * BITS_PER_BYTE; i++) {
 985                 const char *name = NULL;
 986
 987                 if (!(sdev->sdev_bflags & BIT(i)))
 988                         continue;
 989                 if (i < ARRAY_SIZE(sdev_bflags_name) && sdev_bflags_name[i])
 990                         name = sdev_bflags_name[i];
 991
 992                 if (name)
 993                         len += snprintf(buf + len, PAGE_SIZE - len,
 994                                         "%s%s", len ? " " : "", name);
 995                 else
 996                         len += snprintf(buf + len, PAGE_SIZE - len,
 997                                         "%sINVALID_BIT(%d)", len ? " " : "", i);
 998         }
 999         if (len)
1000                 len += snprintf(buf + len, PAGE_SIZE - len, "\n");
1001         return len;
1002 }
1003 static DEVICE_ATTR(blacklist, S_IRUGO, sdev_show_blacklist, NULL);
1004
1005 #ifdef CONFIG_SCSI_DH
1006 static ssize_t
1007 sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
1008                    char *buf)
1009 {
1010         struct scsi_device *sdev = to_scsi_device(dev);
1011
1012         if (!sdev->handler)
1013                 return snprintf(buf, 20, "detached\n");
1014
1015         return snprintf(buf, 20, "%s\n", sdev->handler->name);
1016 }
1017
1018 static ssize_t
1019 sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
1020                     const char *buf, size_t count)
1021 {
1022         struct scsi_device *sdev = to_scsi_device(dev);
1023         int err = -EINVAL;
1024
1025         if (sdev->sdev_state == SDEV_CANCEL ||
1026             sdev->sdev_state == SDEV_DEL)
1027                 return -ENODEV;
1028
1029         if (!sdev->handler) {
1030                 /*
1031                  * Attach to a device handler
1032                  */
1033                 err = scsi_dh_attach(sdev->request_queue, buf);
1034         } else if (!strncmp(buf, "activate", 8)) {
1035                 /*
1036                  * Activate a device handler
1037                  */
1038                 if (sdev->handler->activate)
1039                         err = sdev->handler->activate(sdev, NULL, NULL);
1040                 else
1041                         err = 0;
1042         } else if (!strncmp(buf, "detach", 6)) {
1043                 /*
1044                  * Detach from a device handler
1045                  */
1046                 sdev_printk(KERN_WARNING, sdev,
1047                             "can't detach handler %s.\n",
1048                             sdev->handler->name);
1049                 err = -EINVAL;
1050         }
1051
1052         return err < 0 ? err : count;
1053 }
1054
1055 static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
1056                    sdev_store_dh_state);
1057
1058 static ssize_t
1059 sdev_show_access_state(struct device *dev,
1060                        struct device_attribute *attr,
1061                        char *buf)
1062 {
1063         struct scsi_device *sdev = to_scsi_device(dev);
1064         unsigned char access_state;
1065         const char *access_state_name;
1066
1067         if (!sdev->handler)
1068                 return -EINVAL;
1069
1070         access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK);
1071         access_state_name = scsi_access_state_name(access_state);
1072
1073         return sprintf(buf, "%s\n",
1074                        access_state_name ? access_state_name : "unknown");
1075 }
1076 static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL);
1077
1078 static ssize_t
1079 sdev_show_preferred_path(struct device *dev,
1080                          struct device_attribute *attr,
1081                          char *buf)
1082 {
1083         struct scsi_device *sdev = to_scsi_device(dev);
1084
1085         if (!sdev->handler)
1086                 return -EINVAL;
1087
1088         if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED)
1089                 return sprintf(buf, "1\n");
1090         else
1091                 return sprintf(buf, "0\n");
1092 }
1093 static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL);
1094 #endif
1095
1096 static ssize_t
1097 sdev_show_queue_ramp_up_period(struct device *dev,
1098                                struct device_attribute *attr,
1099                                char *buf)
1100 {
1101         struct scsi_device *sdev;
1102         sdev = to_scsi_device(dev);
1103         return snprintf(buf, 20, "%u\n",
1104                         jiffies_to_msecs(sdev->queue_ramp_up_period));
1105 }
1106
1107 static ssize_t
1108 sdev_store_queue_ramp_up_period(struct device *dev,
1109                                 struct device_attribute *attr,
1110                                 const char *buf, size_t count)
1111 {
1112         struct scsi_device *sdev = to_scsi_device(dev);
1113         unsigned int period;
1114
1115         if (kstrtouint(buf, 10, &period))
1116                 return -EINVAL;
1117
1118         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
1119         return count;
1120 }
1121
1122 static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
1123                    sdev_show_queue_ramp_up_period,
1124                    sdev_store_queue_ramp_up_period);
1125
1126 static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
1127                                          struct attribute *attr, int i)
1128 {
1129         struct device *dev = container_of(kobj, struct device, kobj);
1130         struct scsi_device *sdev = to_scsi_device(dev);
1131
1132
1133         if (attr == &dev_attr_queue_depth.attr &&
1134             !sdev->host->hostt->change_queue_depth)
1135                 return S_IRUGO;
1136
1137         if (attr == &dev_attr_queue_ramp_up_period.attr &&
1138             !sdev->host->hostt->change_queue_depth)
1139                 return 0;
1140
1141 #ifdef CONFIG_SCSI_DH
1142         if (attr == &dev_attr_access_state.attr &&
1143             !sdev->handler)
1144                 return 0;
1145         if (attr == &dev_attr_preferred_path.attr &&
1146             !sdev->handler)
1147                 return 0;
1148 #endif
1149         return attr->mode;
1150 }
1151
1152 static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
1153                                              struct bin_attribute *attr, int i)
1154 {
1155         struct device *dev = container_of(kobj, struct device, kobj);
1156         struct scsi_device *sdev = to_scsi_device(dev);
1157
1158
1159         if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80)
1160                 return 0;
1161
1162         if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83)
1163                 return 0;
1164
1165         return S_IRUGO;
1166 }
1167
1168 /* Default template for device attributes.  May NOT be modified */
1169 static struct attribute *scsi_sdev_attrs[] = {
1170         &dev_attr_device_blocked.attr,
1171         &dev_attr_type.attr,
1172         &dev_attr_scsi_level.attr,
1173         &dev_attr_device_busy.attr,
1174         &dev_attr_vendor.attr,
1175         &dev_attr_model.attr,
1176         &dev_attr_rev.attr,
1177         &dev_attr_rescan.attr,
1178         &dev_attr_delete.attr,
1179         &dev_attr_state.attr,
1180         &dev_attr_timeout.attr,
1181         &dev_attr_eh_timeout.attr,
1182         &dev_attr_iocounterbits.attr,
1183         &dev_attr_iorequest_cnt.attr,
1184         &dev_attr_iodone_cnt.attr,
1185         &dev_attr_ioerr_cnt.attr,
1186         &dev_attr_modalias.attr,
1187         &dev_attr_queue_depth.attr,
1188         &dev_attr_queue_type.attr,
1189         &dev_attr_wwid.attr,
1190         &dev_attr_blacklist.attr,
1191 #ifdef CONFIG_SCSI_DH
1192         &dev_attr_dh_state.attr,
1193         &dev_attr_access_state.attr,
1194         &dev_attr_preferred_path.attr,
1195 #endif
1196         &dev_attr_queue_ramp_up_period.attr,
1197         REF_EVT(media_change),
1198         REF_EVT(inquiry_change_reported),
1199         REF_EVT(capacity_change_reported),
1200         REF_EVT(soft_threshold_reached),
1201         REF_EVT(mode_parameter_change_reported),
1202         REF_EVT(lun_change_reported),
1203         NULL
1204 };
1205
1206 static struct bin_attribute *scsi_sdev_bin_attrs[] = {
1207         &dev_attr_vpd_pg83,
1208         &dev_attr_vpd_pg80,
1209         &dev_attr_inquiry,
1210         NULL
1211 };
1212 static struct attribute_group scsi_sdev_attr_group = {
1213         .attrs =        scsi_sdev_attrs,
1214         .bin_attrs =    scsi_sdev_bin_attrs,
1215         .is_visible =   scsi_sdev_attr_is_visible,
1216         .is_bin_visible = scsi_sdev_bin_attr_is_visible,
1217 };
1218
1219 static const struct attribute_group *scsi_sdev_attr_groups[] = {
1220         &scsi_sdev_attr_group,
1221         NULL
1222 };
1223
1224 static int scsi_target_add(struct scsi_target *starget)
1225 {
1226         int error;
1227
1228         if (starget->state != STARGET_CREATED)
1229                 return 0;
1230
1231         error = device_add(&starget->dev);
1232         if (error) {
1233                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
1234                 return error;
1235         }
1236         transport_add_device(&starget->dev);
1237         starget->state = STARGET_RUNNING;
1238
1239         pm_runtime_set_active(&starget->dev);
1240         pm_runtime_enable(&starget->dev);
1241         device_enable_async_suspend(&starget->dev);
1242
1243         return 0;
1244 }
1245
1246 /**
1247  * scsi_sysfs_add_sdev - add scsi device to sysfs
1248  * @sdev:       scsi_device to add
1249  *
1250  * Return value:
1251  *      0 on Success / non-zero on Failure
1252  **/
1253 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1254 {
1255         int error, i;
1256         struct request_queue *rq = sdev->request_queue;
1257         struct scsi_target *starget = sdev->sdev_target;
1258
1259         error = scsi_target_add(starget);
1260         if (error)
1261                 return error;
1262
1263         transport_configure_device(&starget->dev);
1264
1265         device_enable_async_suspend(&sdev->sdev_gendev);
1266         scsi_autopm_get_target(starget);
1267         pm_runtime_set_active(&sdev->sdev_gendev);
1268         pm_runtime_forbid(&sdev->sdev_gendev);
1269         pm_runtime_enable(&sdev->sdev_gendev);
1270         scsi_autopm_put_target(starget);
1271
1272         scsi_autopm_get_device(sdev);
1273
1274         scsi_dh_add_device(sdev);
1275
1276         error = device_add(&sdev->sdev_gendev);
1277         if (error) {
1278                 sdev_printk(KERN_INFO, sdev,
1279                                 "failed to add device: %d\n", error);
1280                 scsi_dh_remove_device(sdev);
1281                 return error;
1282         }
1283
1284         device_enable_async_suspend(&sdev->sdev_dev);
1285         error = device_add(&sdev->sdev_dev);
1286         if (error) {
1287                 sdev_printk(KERN_INFO, sdev,
1288                                 "failed to add class device: %d\n", error);
1289                 scsi_dh_remove_device(sdev);
1290                 device_del(&sdev->sdev_gendev);
1291                 return error;
1292         }
1293         transport_add_device(&sdev->sdev_gendev);
1294         sdev->is_visible = 1;
1295
1296         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
1297
1298         if (error)
1299                 /* we're treating error on bsg register as non-fatal,
1300                  * so pretend nothing went wrong */
1301                 sdev_printk(KERN_INFO, sdev,
1302                             "Failed to register bsg queue, errno=%d\n", error);
1303
1304         /* add additional host specific attributes */
1305         if (sdev->host->hostt->sdev_attrs) {
1306                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
1307                         error = device_create_file(&sdev->sdev_gendev,
1308                                         sdev->host->hostt->sdev_attrs[i]);
1309                         if (error)
1310                                 return error;
1311                 }
1312         }
1313
1314         scsi_autopm_put_device(sdev);
1315         return error;
1316 }
1317
1318 void __scsi_remove_device(struct scsi_device *sdev)
1319 {
1320         struct device *dev = &sdev->sdev_gendev;
1321         int res;
1322
1323         /*
1324          * This cleanup path is not reentrant and while it is impossible
1325          * to get a new reference with scsi_device_get() someone can still
1326          * hold a previously acquired one.
1327          */
1328         if (sdev->sdev_state == SDEV_DEL)
1329                 return;
1330
1331         if (sdev->is_visible) {
1332                 /*
1333                  * If scsi_internal_target_block() is running concurrently,
1334                  * wait until it has finished before changing the device state.
1335                  */
1336                 mutex_lock(&sdev->state_mutex);
1337                 /*
1338                  * If blocked, we go straight to DEL and restart the queue so
1339                  * any commands issued during driver shutdown (like sync
1340                  * cache) are errored immediately.
1341                  */
1342                 res = scsi_device_set_state(sdev, SDEV_CANCEL);
1343                 if (res != 0) {
1344                         res = scsi_device_set_state(sdev, SDEV_DEL);
1345                         if (res == 0)
1346                                 scsi_start_queue(sdev);
1347                 }
1348                 mutex_unlock(&sdev->state_mutex);
1349
1350                 if (res != 0)
1351                         return;
1352
1353                 bsg_unregister_queue(sdev->request_queue);
1354                 device_unregister(&sdev->sdev_dev);
1355                 transport_remove_device(dev);
1356                 scsi_dh_remove_device(sdev);
1357                 device_del(dev);
1358         } else
1359                 put_device(&sdev->sdev_dev);
1360
1361         /*
1362          * Stop accepting new requests and wait until all queuecommand() and
1363          * scsi_run_queue() invocations have finished before tearing down the
1364          * device.
1365          */
1366         mutex_lock(&sdev->state_mutex);
1367         scsi_device_set_state(sdev, SDEV_DEL);
1368         mutex_unlock(&sdev->state_mutex);
1369
1370         blk_cleanup_queue(sdev->request_queue);
1371         cancel_work_sync(&sdev->requeue_work);
1372
1373         if (sdev->host->hostt->slave_destroy)
1374                 sdev->host->hostt->slave_destroy(sdev);
1375         transport_destroy_device(dev);
1376
1377         /*
1378          * Paired with the kref_get() in scsi_sysfs_initialize().  We have
1379          * remoed sysfs visibility from the device, so make the target
1380          * invisible if this was the last device underneath it.
1381          */
1382         scsi_target_reap(scsi_target(sdev));
1383
1384         put_device(dev);
1385 }
1386
1387 /**
1388  * scsi_remove_device - unregister a device from the scsi bus
1389  * @sdev:       scsi_device to unregister
1390  **/
1391 void scsi_remove_device(struct scsi_device *sdev)
1392 {
1393         struct Scsi_Host *shost = sdev->host;
1394
1395         mutex_lock(&shost->scan_mutex);
1396         __scsi_remove_device(sdev);
1397         mutex_unlock(&shost->scan_mutex);
1398 }
1399 EXPORT_SYMBOL(scsi_remove_device);
1400
1401 static void __scsi_remove_target(struct scsi_target *starget)
1402 {
1403         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1404         unsigned long flags;
1405         struct scsi_device *sdev;
1406
1407         spin_lock_irqsave(shost->host_lock, flags);
1408  restart:
1409         list_for_each_entry(sdev, &shost->__devices, siblings) {
1410                 /*
1411                  * We cannot call scsi_device_get() here, as
1412                  * we might've been called from rmmod() causing
1413                  * scsi_device_get() to fail the module_is_live()
1414                  * check.
1415                  */
1416                 if (sdev->channel != starget->channel ||
1417                     sdev->id != starget->id ||
1418                     !get_device(&sdev->sdev_gendev))
1419                         continue;
1420                 spin_unlock_irqrestore(shost->host_lock, flags);
1421                 scsi_remove_device(sdev);
1422                 put_device(&sdev->sdev_gendev);
1423                 spin_lock_irqsave(shost->host_lock, flags);
1424                 goto restart;
1425         }
1426         spin_unlock_irqrestore(shost->host_lock, flags);
1427 }
1428
1429 /**
1430  * scsi_remove_target - try to remove a target and all its devices
1431  * @dev: generic starget or parent of generic stargets to be removed
1432  *
1433  * Note: This is slightly racy.  It is possible that if the user
1434  * requests the addition of another device then the target won't be
1435  * removed.
1436  */
1437 void scsi_remove_target(struct device *dev)
1438 {
1439         struct Scsi_Host *shost = dev_to_shost(dev->parent);
1440         struct scsi_target *starget;
1441         unsigned long flags;
1442
1443 restart:
1444         spin_lock_irqsave(shost->host_lock, flags);
1445         list_for_each_entry(starget, &shost->__targets, siblings) {
1446                 if (starget->state == STARGET_DEL ||
1447                     starget->state == STARGET_REMOVE ||
1448                     starget->state == STARGET_CREATED_REMOVE)
1449                         continue;
1450                 if (starget->dev.parent == dev || &starget->dev == dev) {
1451                         kref_get(&starget->reap_ref);
1452                         if (starget->state == STARGET_CREATED)
1453                                 starget->state = STARGET_CREATED_REMOVE;
1454                         else
1455                                 starget->state = STARGET_REMOVE;
1456                         spin_unlock_irqrestore(shost->host_lock, flags);
1457                         __scsi_remove_target(starget);
1458                         scsi_target_reap(starget);
1459                         goto restart;
1460                 }
1461         }
1462         spin_unlock_irqrestore(shost->host_lock, flags);
1463 }
1464 EXPORT_SYMBOL(scsi_remove_target);
1465
1466 int scsi_register_driver(struct device_driver *drv)
1467 {
1468         drv->bus = &scsi_bus_type;
1469
1470         return driver_register(drv);
1471 }
1472 EXPORT_SYMBOL(scsi_register_driver);
1473
1474 int scsi_register_interface(struct class_interface *intf)
1475 {
1476         intf->class = &sdev_class;
1477
1478         return class_interface_register(intf);
1479 }
1480 EXPORT_SYMBOL(scsi_register_interface);
1481
1482 /**
1483  * scsi_sysfs_add_host - add scsi host to subsystem
1484  * @shost:     scsi host struct to add to subsystem
1485  **/
1486 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1487 {
1488         int error, i;
1489
1490         /* add host specific attributes */
1491         if (shost->hostt->shost_attrs) {
1492                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1493                         error = device_create_file(&shost->shost_dev,
1494                                         shost->hostt->shost_attrs[i]);
1495                         if (error)
1496                                 return error;
1497                 }
1498         }
1499
1500         transport_register_device(&shost->shost_gendev);
1501         transport_configure_device(&shost->shost_gendev);
1502         return 0;
1503 }
1504
1505 static struct device_type scsi_dev_type = {
1506         .name =         "scsi_device",
1507         .release =      scsi_device_dev_release,
1508         .groups =       scsi_sdev_attr_groups,
1509 };
1510
1511 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1512 {
1513         unsigned long flags;
1514         struct Scsi_Host *shost = sdev->host;
1515         struct scsi_target  *starget = sdev->sdev_target;
1516
1517         device_initialize(&sdev->sdev_gendev);
1518         sdev->sdev_gendev.bus = &scsi_bus_type;
1519         sdev->sdev_gendev.type = &scsi_dev_type;
1520         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu",
1521                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1522
1523         device_initialize(&sdev->sdev_dev);
1524         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1525         sdev->sdev_dev.class = &sdev_class;
1526         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu",
1527                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1528         /*
1529          * Get a default scsi_level from the target (derived from sibling
1530          * devices).  This is the best we can do for guessing how to set
1531          * sdev->lun_in_cdb for the initial INQUIRY command.  For LUN 0 the
1532          * setting doesn't matter, because all the bits are zero anyway.
1533          * But it does matter for higher LUNs.
1534          */
1535         sdev->scsi_level = starget->scsi_level;
1536         if (sdev->scsi_level <= SCSI_2 &&
1537                         sdev->scsi_level != SCSI_UNKNOWN &&
1538                         !shost->no_scsi2_lun_in_cdb)
1539                 sdev->lun_in_cdb = 1;
1540
1541         transport_setup_device(&sdev->sdev_gendev);
1542         spin_lock_irqsave(shost->host_lock, flags);
1543         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1544         list_add_tail(&sdev->siblings, &shost->__devices);
1545         spin_unlock_irqrestore(shost->host_lock, flags);
1546         /*
1547          * device can now only be removed via __scsi_remove_device() so hold
1548          * the target.  Target will be held in CREATED state until something
1549          * beneath it becomes visible (in which case it moves to RUNNING)
1550          */
1551         kref_get(&starget->reap_ref);
1552 }
1553
1554 int scsi_is_sdev_device(const struct device *dev)
1555 {
1556         return dev->type == &scsi_dev_type;
1557 }
1558 EXPORT_SYMBOL(scsi_is_sdev_device);
1559
1560 /* A blank transport template that is used in drivers that don't
1561  * yet implement Transport Attributes */
1562 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };