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