drivers/scsi/scsi_sysfs.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * scsi_sysfs.c
   4  *
   5  * SCSI sysfs interface routines.
   6  *
   7  * Created to pull SCSI mid layer sysfs routines into one file.
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/slab.h>
  12 #include <linux/init.h>
  13 #include <linux/blkdev.h>
  14 #include <linux/device.h>
  15 #include <linux/pm_runtime.h>
  16
  17 #include <scsi/scsi.h>
  18 #include <scsi/scsi_device.h>
  19 #include <scsi/scsi_host.h>
  20 #include <scsi/scsi_tcq.h>
  21 #include <scsi/scsi_dh.h>
  22 #include <scsi/scsi_transport.h>
  23 #include <scsi/scsi_driver.h>
  24 #include <scsi/scsi_devinfo.h>
  25
  26 #include "scsi_priv.h"
  27 #include "scsi_logging.h"
  28
  29 static struct device_type scsi_dev_type;
  30
  31 static const struct {
  32         enum scsi_device_state  value;
  33         char                    *name;
  34 } sdev_states[] = {
  35         { SDEV_CREATED, "created" },
  36         { SDEV_RUNNING, "running" },
  37         { SDEV_CANCEL, "cancel" },
  38         { SDEV_DEL, "deleted" },
  39         { SDEV_QUIESCE, "quiesce" },
  40         { SDEV_OFFLINE, "offline" },
  41         { SDEV_TRANSPORT_OFFLINE, "transport-offline" },
  42         { SDEV_BLOCK,   "blocked" },
  43         { SDEV_CREATED_BLOCK, "created-blocked" },
  44 };
  45
  46 const char *scsi_device_state_name(enum scsi_device_state state)
  47 {
  48         int i;
  49         char *name = NULL;
  50
  51         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
  52                 if (sdev_states[i].value == state) {
  53                         name = sdev_states[i].name;
  54                         break;
  55                 }
  56         }
  57         return name;
  58 }
  59
  60 static const struct {
  61         enum scsi_host_state    value;
  62         char                    *name;
  63 } shost_states[] = {
  64         { SHOST_CREATED, "created" },
  65         { SHOST_RUNNING, "running" },
  66         { SHOST_CANCEL, "cancel" },
  67         { SHOST_DEL, "deleted" },
  68         { SHOST_RECOVERY, "recovery" },
  69         { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
  70         { SHOST_DEL_RECOVERY, "deleted/recovery", },
  71 };
  72 const char *scsi_host_state_name(enum scsi_host_state state)
  73 {
  74         int i;
  75         char *name = NULL;
  76
  77         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
  78                 if (shost_states[i].value == state) {
  79                         name = shost_states[i].name;
  80                         break;
  81                 }
  82         }
  83         return name;
  84 }
  85
  86 #ifdef CONFIG_SCSI_DH
  87 static const struct {
  88         unsigned char   value;
  89         char            *name;
  90 } sdev_access_states[] = {
  91         { SCSI_ACCESS_STATE_OPTIMAL, "active/optimized" },
  92         { SCSI_ACCESS_STATE_ACTIVE, "active/non-optimized" },
  93         { SCSI_ACCESS_STATE_STANDBY, "standby" },
  94         { SCSI_ACCESS_STATE_UNAVAILABLE, "unavailable" },
  95         { SCSI_ACCESS_STATE_LBA, "lba-dependent" },
  96         { SCSI_ACCESS_STATE_OFFLINE, "offline" },
  97         { SCSI_ACCESS_STATE_TRANSITIONING, "transitioning" },
  98 };
  99
 100 static const char *scsi_access_state_name(unsigned char state)
 101 {
 102         int i;
 103         char *name = NULL;
 104
 105         for (i = 0; i < ARRAY_SIZE(sdev_access_states); i++) {
 106                 if (sdev_access_states[i].value == state) {
 107                         name = sdev_access_states[i].name;
 108                         break;
 109                 }
 110         }
 111         return name;
 112 }
 113 #endif
 114
 115 static int check_set(unsigned long long *val, char *src)
 116 {
 117         char *last;
 118
 119         if (strcmp(src, "-") == 0) {
 120                 *val = SCAN_WILD_CARD;
 121         } else {
 122                 /*
 123                  * Doesn't check for int overflow
 124                  */
 125                 *val = simple_strtoull(src, &last, 0);
 126                 if (*last != '\0')
 127                         return 1;
 128         }
 129         return 0;
 130 }
 131
 132 static int scsi_scan(struct Scsi_Host *shost, const char *str)
 133 {
 134         char s1[15], s2[15], s3[17], junk;
 135         unsigned long long channel, id, lun;
 136         int res;
 137
 138         res = sscanf(str, "%10s %10s %16s %c", s1, s2, s3, &junk);
 139         if (res != 3)
 140                 return -EINVAL;
 141         if (check_set(&channel, s1))
 142                 return -EINVAL;
 143         if (check_set(&id, s2))
 144                 return -EINVAL;
 145         if (check_set(&lun, s3))
 146                 return -EINVAL;
 147         if (shost->transportt->user_scan)
 148                 res = shost->transportt->user_scan(shost, channel, id, lun);
 149         else
 150                 res = scsi_scan_host_selected(shost, channel, id, lun,
 151                                               SCSI_SCAN_MANUAL);
 152         return res;
 153 }
 154
 155 /*
 156  * shost_show_function: macro to create an attr function that can be used to
 157  * show a non-bit field.
 158  */
 159 #define shost_show_function(name, field, format_string)                 \
 160 static ssize_t                                                          \
 161 show_##name (struct device *dev, struct device_attribute *attr,         \
 162              char *buf)                                                 \
 163 {                                                                       \
 164         struct Scsi_Host *shost = class_to_shost(dev);                  \
 165         return snprintf (buf, 20, format_string, shost->field);         \
 166 }
 167
 168 /*
 169  * shost_rd_attr: macro to create a function and attribute variable for a
 170  * read only field.
 171  */
 172 #define shost_rd_attr2(name, field, format_string)                      \
 173         shost_show_function(name, field, format_string)                 \
 174 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
 175
 176 #define shost_rd_attr(field, format_string) \
 177 shost_rd_attr2(field, field, format_string)
 178
 179 /*
 180  * Create the actual show/store functions and data structures.
 181  */
 182
 183 static ssize_t
 184 store_scan(struct device *dev, struct device_attribute *attr,
 185            const char *buf, size_t count)
 186 {
 187         struct Scsi_Host *shost = class_to_shost(dev);
 188         int res;
 189
 190         res = scsi_scan(shost, buf);
 191         if (res == 0)
 192                 res = count;
 193         return res;
 194 };
 195 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
 196
 197 static ssize_t
 198 store_shost_state(struct device *dev, struct device_attribute *attr,
 199                   const char *buf, size_t count)
 200 {
 201         int i;
 202         struct Scsi_Host *shost = class_to_shost(dev);
 203         enum scsi_host_state state = 0;
 204
 205         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
 206                 const int len = strlen(shost_states[i].name);
 207                 if (strncmp(shost_states[i].name, buf, len) == 0 &&
 208                    buf[len] == '\n') {
 209                         state = shost_states[i].value;
 210                         break;
 211                 }
 212         }
 213         if (!state)
 214                 return -EINVAL;
 215
 216         if (scsi_host_set_state(shost, state))
 217                 return -EINVAL;
 218         return count;
 219 }
 220
 221 static ssize_t
 222 show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
 223 {
 224         struct Scsi_Host *shost = class_to_shost(dev);
 225         const char *name = scsi_host_state_name(shost->shost_state);
 226
 227         if (!name)
 228                 return -EINVAL;
 229
 230         return snprintf(buf, 20, "%s\n", name);
 231 }
 232
 233 /* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
 234 static struct device_attribute dev_attr_hstate =
 235         __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
 236
 237 static ssize_t
 238 show_shost_mode(unsigned int mode, char *buf)
 239 {
 240         ssize_t len = 0;
 241
 242         if (mode & MODE_INITIATOR)
 243                 len = sprintf(buf, "%s", "Initiator");
 244
 245         if (mode & MODE_TARGET)
 246                 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
 247
 248         len += sprintf(buf + len, "\n");
 249
 250         return len;
 251 }
 252
 253 static ssize_t
 254 show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
 255                           char *buf)
 256 {
 257         struct Scsi_Host *shost = class_to_shost(dev);
 258         unsigned int supported_mode = shost->hostt->supported_mode;
 259
 260         if (supported_mode == MODE_UNKNOWN)
 261                 /* by default this should be initiator */
 262                 supported_mode = MODE_INITIATOR;
 263
 264         return show_shost_mode(supported_mode, buf);
 265 }
 266
 267 static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
 268
 269 static ssize_t
 270 show_shost_active_mode(struct device *dev,
 271                        struct device_attribute *attr, char *buf)
 272 {
 273         struct Scsi_Host *shost = class_to_shost(dev);
 274
 275         if (shost->active_mode == MODE_UNKNOWN)
 276                 return snprintf(buf, 20, "unknown\n");
 277         else
 278                 return show_shost_mode(shost->active_mode, buf);
 279 }
 280
 281 static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
 282
 283 static int check_reset_type(const char *str)
 284 {
 285         if (sysfs_streq(str, "adapter"))
 286                 return SCSI_ADAPTER_RESET;
 287         else if (sysfs_streq(str, "firmware"))
 288                 return SCSI_FIRMWARE_RESET;
 289         else
 290                 return 0;
 291 }
 292
 293 static ssize_t
 294 store_host_reset(struct device *dev, struct device_attribute *attr,
 295                 const char *buf, size_t count)
 296 {
 297         struct Scsi_Host *shost = class_to_shost(dev);
 298         struct scsi_host_template *sht = shost->hostt;
 299         int ret = -EINVAL;
 300         int type;
 301
 302         type = check_reset_type(buf);
 303         if (!type)
 304                 goto exit_store_host_reset;
 305
 306         if (sht->host_reset)
 307                 ret = sht->host_reset(shost, type);
 308         else
 309                 ret = -EOPNOTSUPP;
 310
 311 exit_store_host_reset:
 312         if (ret == 0)
 313                 ret = count;
 314         return ret;
 315 }
 316
 317 static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
 318
 319 static ssize_t
 320 show_shost_eh_deadline(struct device *dev,
 321                       struct device_attribute *attr, char *buf)
 322 {
 323         struct Scsi_Host *shost = class_to_shost(dev);
 324
 325         if (shost->eh_deadline == -1)
 326                 return snprintf(buf, strlen("off") + 2, "off\n");
 327         return sprintf(buf, "%u\n", shost->eh_deadline / HZ);
 328 }
 329
 330 static ssize_t
 331 store_shost_eh_deadline(struct device *dev, struct device_attribute *attr,
 332                 const char *buf, size_t count)
 333 {
 334         struct Scsi_Host *shost = class_to_shost(dev);
 335         int ret = -EINVAL;
 336         unsigned long deadline, flags;
 337
 338         if (shost->transportt &&
 339             (shost->transportt->eh_strategy_handler ||
 340              !shost->hostt->eh_host_reset_handler))
 341                 return ret;
 342
 343         if (!strncmp(buf, "off", strlen("off")))
 344                 deadline = -1;
 345         else {
 346                 ret = kstrtoul(buf, 10, &deadline);
 347                 if (ret)
 348                         return ret;
 349                 if (deadline * HZ > UINT_MAX)
 350                         return -EINVAL;
 351         }
 352
 353         spin_lock_irqsave(shost->host_lock, flags);
 354         if (scsi_host_in_recovery(shost))
 355                 ret = -EBUSY;
 356         else {
 357                 if (deadline == -1)
 358                         shost->eh_deadline = -1;
 359                 else
 360                         shost->eh_deadline = deadline * HZ;
 361
 362                 ret = count;
 363         }
 364         spin_unlock_irqrestore(shost->host_lock, flags);
 365
 366         return ret;
 367 }
 368
 369 static DEVICE_ATTR(eh_deadline, S_IRUGO | S_IWUSR, show_shost_eh_deadline, store_shost_eh_deadline);
 370
 371 shost_rd_attr(unique_id, "%u\n");
 372 shost_rd_attr(cmd_per_lun, "%hd\n");
 373 shost_rd_attr(can_queue, "%hd\n");
 374 shost_rd_attr(sg_tablesize, "%hu\n");
 375 shost_rd_attr(sg_prot_tablesize, "%hu\n");
 376 shost_rd_attr(unchecked_isa_dma, "%d\n");
 377 shost_rd_attr(prot_capabilities, "%u\n");
 378 shost_rd_attr(prot_guard_type, "%hd\n");
 379 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
 380
 381 static ssize_t
 382 show_host_busy(struct device *dev, struct device_attribute *attr, char *buf)
 383 {
 384         struct Scsi_Host *shost = class_to_shost(dev);
 385         return snprintf(buf, 20, "%d\n", scsi_host_busy(shost));
 386 }
 387 static DEVICE_ATTR(host_busy, S_IRUGO, show_host_busy, NULL);
 388
 389 static ssize_t
 390 show_use_blk_mq(struct device *dev, struct device_attribute *attr, char *buf)
 391 {
 392         return sprintf(buf, "1\n");
 393 }
 394 static DEVICE_ATTR(use_blk_mq, S_IRUGO, show_use_blk_mq, NULL);
 395
 396 static struct attribute *scsi_sysfs_shost_attrs[] = {
 397         &dev_attr_use_blk_mq.attr,
 398         &dev_attr_unique_id.attr,
 399         &dev_attr_host_busy.attr,
 400         &dev_attr_cmd_per_lun.attr,
 401         &dev_attr_can_queue.attr,
 402         &dev_attr_sg_tablesize.attr,
 403         &dev_attr_sg_prot_tablesize.attr,
 404         &dev_attr_unchecked_isa_dma.attr,
 405         &dev_attr_proc_name.attr,
 406         &dev_attr_scan.attr,
 407         &dev_attr_hstate.attr,
 408         &dev_attr_supported_mode.attr,
 409         &dev_attr_active_mode.attr,
 410         &dev_attr_prot_capabilities.attr,
 411         &dev_attr_prot_guard_type.attr,
 412         &dev_attr_host_reset.attr,
 413         &dev_attr_eh_deadline.attr,
 414         NULL
 415 };
 416
 417 static struct attribute_group scsi_shost_attr_group = {
 418         .attrs =        scsi_sysfs_shost_attrs,
 419 };
 420
 421 const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
 422         &scsi_shost_attr_group,
 423         NULL
 424 };
 425
 426 static void scsi_device_cls_release(struct device *class_dev)
 427 {
 428         struct scsi_device *sdev;
 429
 430         sdev = class_to_sdev(class_dev);
 431         put_device(&sdev->sdev_gendev);
 432 }
 433
 434 static void scsi_device_dev_release_usercontext(struct work_struct *work)
 435 {
 436         struct scsi_device *sdev;
 437         struct device *parent;
 438         struct list_head *this, *tmp;
 439         struct scsi_vpd *vpd_pg80 = NULL, *vpd_pg83 = NULL;
 440         struct scsi_vpd *vpd_pg0 = NULL, *vpd_pg89 = NULL;
 441         unsigned long flags;
 442
 443         sdev = container_of(work, struct scsi_device, ew.work);
 444
 445         scsi_dh_release_device(sdev);
 446
 447         parent = sdev->sdev_gendev.parent;
 448
 449         spin_lock_irqsave(sdev->host->host_lock, flags);
 450         list_del(&sdev->siblings);
 451         list_del(&sdev->same_target_siblings);
 452         list_del(&sdev->starved_entry);
 453         spin_unlock_irqrestore(sdev->host->host_lock, flags);
 454
 455         cancel_work_sync(&sdev->event_work);
 456
 457         list_for_each_safe(this, tmp, &sdev->event_list) {
 458                 struct scsi_event *evt;
 459
 460                 evt = list_entry(this, struct scsi_event, node);
 461                 list_del(&evt->node);
 462                 kfree(evt);
 463         }
 464
 465         blk_put_queue(sdev->request_queue);
 466         /* NULL queue means the device can't be used */
 467         sdev->request_queue = NULL;
 468
 469         mutex_lock(&sdev->inquiry_mutex);
 470         vpd_pg0 = rcu_replace_pointer(sdev->vpd_pg0, vpd_pg0,
 471                                        lockdep_is_held(&sdev->inquiry_mutex));
 472         vpd_pg80 = rcu_replace_pointer(sdev->vpd_pg80, vpd_pg80,
 473                                        lockdep_is_held(&sdev->inquiry_mutex));
 474         vpd_pg83 = rcu_replace_pointer(sdev->vpd_pg83, vpd_pg83,
 475                                        lockdep_is_held(&sdev->inquiry_mutex));
 476         vpd_pg89 = rcu_replace_pointer(sdev->vpd_pg89, vpd_pg89,
 477                                        lockdep_is_held(&sdev->inquiry_mutex));
 478         mutex_unlock(&sdev->inquiry_mutex);
 479
 480         if (vpd_pg0)
 481                 kfree_rcu(vpd_pg0, rcu);
 482         if (vpd_pg83)
 483                 kfree_rcu(vpd_pg83, rcu);
 484         if (vpd_pg80)
 485                 kfree_rcu(vpd_pg80, rcu);
 486         if (vpd_pg89)
 487                 kfree_rcu(vpd_pg89, rcu);
 488         kfree(sdev->inquiry);
 489         kfree(sdev);
 490
 491         if (parent)
 492                 put_device(parent);
 493 }
 494
 495 static void scsi_device_dev_release(struct device *dev)
 496 {
 497         struct scsi_device *sdp = to_scsi_device(dev);
 498         execute_in_process_context(scsi_device_dev_release_usercontext,
 499                                    &sdp->ew);
 500 }
 501
 502 static struct class sdev_class = {
 503         .name           = "scsi_device",
 504         .dev_release    = scsi_device_cls_release,
 505 };
 506
 507 /* all probing is done in the individual ->probe routines */
 508 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 509 {
 510         struct scsi_device *sdp;
 511
 512         if (dev->type != &scsi_dev_type)
 513                 return 0;
 514
 515         sdp = to_scsi_device(dev);
 516         if (sdp->no_uld_attach)
 517                 return 0;
 518         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 519 }
 520
 521 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 522 {
 523         struct scsi_device *sdev;
 524
 525         if (dev->type != &scsi_dev_type)
 526                 return 0;
 527
 528         sdev = to_scsi_device(dev);
 529
 530         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 531         return 0;
 532 }
 533
 534 struct bus_type scsi_bus_type = {
 535         .name           = "scsi",
 536         .match          = scsi_bus_match,
 537         .uevent         = scsi_bus_uevent,
 538 #ifdef CONFIG_PM
 539         .pm             = &scsi_bus_pm_ops,
 540 #endif
 541 };
 542 EXPORT_SYMBOL_GPL(scsi_bus_type);
 543
 544 int scsi_sysfs_register(void)
 545 {
 546         int error;
 547
 548         error = bus_register(&scsi_bus_type);
 549         if (!error) {
 550                 error = class_register(&sdev_class);
 551                 if (error)
 552                         bus_unregister(&scsi_bus_type);
 553         }
 554
 555         return error;
 556 }
 557
 558 void scsi_sysfs_unregister(void)
 559 {
 560         class_unregister(&sdev_class);
 561         bus_unregister(&scsi_bus_type);
 562 }
 563
 564 /*
 565  * sdev_show_function: macro to create an attr function that can be used to
 566  * show a non-bit field.
 567  */
 568 #define sdev_show_function(field, format_string)                                \
 569 static ssize_t                                                          \
 570 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 571                    char *buf)                                           \
 572 {                                                                       \
 573         struct scsi_device *sdev;                                       \
 574         sdev = to_scsi_device(dev);                                     \
 575         return snprintf (buf, 20, format_string, sdev->field);          \
 576 }                                                                       \
 577
 578 /*
 579  * sdev_rd_attr: macro to create a function and attribute variable for a
 580  * read only field.
 581  */
 582 #define sdev_rd_attr(field, format_string)                              \
 583         sdev_show_function(field, format_string)                        \
 584 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 585
 586
 587 /*
 588  * sdev_rw_attr: create a function and attribute variable for a
 589  * read/write field.
 590  */
 591 #define sdev_rw_attr(field, format_string)                              \
 592         sdev_show_function(field, format_string)                                \
 593                                                                         \
 594 static ssize_t                                                          \
 595 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 596                     const char *buf, size_t count)                      \
 597 {                                                                       \
 598         struct scsi_device *sdev;                                       \
 599         sdev = to_scsi_device(dev);                                     \
 600         sscanf (buf, format_string, &sdev->field);                      \
 601         return count;                                                   \
 602 }                                                                       \
 603 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 604
 605 /* Currently we don't export bit fields, but we might in future,
 606  * so leave this code in */
 607 #if 0
 608 /*
 609  * sdev_rd_attr: create a function and attribute variable for a
 610  * read/write bit field.
 611  */
 612 #define sdev_rw_attr_bit(field)                                         \
 613         sdev_show_function(field, "%d\n")                                       \
 614                                                                         \
 615 static ssize_t                                                          \
 616 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 617                     const char *buf, size_t count)                      \
 618 {                                                                       \
 619         int ret;                                                        \
 620         struct scsi_device *sdev;                                       \
 621         ret = scsi_sdev_check_buf_bit(buf);                             \
 622         if (ret >= 0)   {                                               \
 623                 sdev = to_scsi_device(dev);                             \
 624                 sdev->field = ret;                                      \
 625                 ret = count;                                            \
 626         }                                                               \
 627         return ret;                                                     \
 628 }                                                                       \
 629 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 630
 631 /*
 632  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 633  * else return -EINVAL.
 634  */
 635 static int scsi_sdev_check_buf_bit(const char *buf)
 636 {
 637         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 638                 if (buf[0] == '1')
 639                         return 1;
 640                 else if (buf[0] == '0')
 641                         return 0;
 642                 else
 643                         return -EINVAL;
 644         } else
 645                 return -EINVAL;
 646 }
 647 #endif
 648 /*
 649  * Create the actual show/store functions and data structures.
 650  */
 651 sdev_rd_attr (type, "%d\n");
 652 sdev_rd_attr (scsi_level, "%d\n");
 653 sdev_rd_attr (vendor, "%.8s\n");
 654 sdev_rd_attr (model, "%.16s\n");
 655 sdev_rd_attr (rev, "%.4s\n");
 656
 657 static ssize_t
 658 sdev_show_device_busy(struct device *dev, struct device_attribute *attr,
 659                 char *buf)
 660 {
 661         struct scsi_device *sdev = to_scsi_device(dev);
 662         return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_busy));
 663 }
 664 static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL);
 665
 666 static ssize_t
 667 sdev_show_device_blocked(struct device *dev, struct device_attribute *attr,
 668                 char *buf)
 669 {
 670         struct scsi_device *sdev = to_scsi_device(dev);
 671         return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_blocked));
 672 }
 673 static DEVICE_ATTR(device_blocked, S_IRUGO, sdev_show_device_blocked, NULL);
 674
 675 /*
 676  * TODO: can we make these symlinks to the block layer ones?
 677  */
 678 static ssize_t
 679 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 680 {
 681         struct scsi_device *sdev;
 682         sdev = to_scsi_device(dev);
 683         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
 684 }
 685
 686 static ssize_t
 687 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 688                     const char *buf, size_t count)
 689 {
 690         struct scsi_device *sdev;
 691         int timeout;
 692         sdev = to_scsi_device(dev);
 693         sscanf (buf, "%d\n", &timeout);
 694         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
 695         return count;
 696 }
 697 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 698
 699 static ssize_t
 700 sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 701 {
 702         struct scsi_device *sdev;
 703         sdev = to_scsi_device(dev);
 704         return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
 705 }
 706
 707 static ssize_t
 708 sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
 709                     const char *buf, size_t count)
 710 {
 711         struct scsi_device *sdev;
 712         unsigned int eh_timeout;
 713         int err;
 714
 715         if (!capable(CAP_SYS_ADMIN))
 716                 return -EACCES;
 717
 718         sdev = to_scsi_device(dev);
 719         err = kstrtouint(buf, 10, &eh_timeout);
 720         if (err)
 721                 return err;
 722         sdev->eh_timeout = eh_timeout * HZ;
 723
 724         return count;
 725 }
 726 static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
 727
 728 static ssize_t
 729 store_rescan_field (struct device *dev, struct device_attribute *attr,
 730                     const char *buf, size_t count)
 731 {
 732         scsi_rescan_device(dev);
 733         return count;
 734 }
 735 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 736
 737 static ssize_t
 738 sdev_store_delete(struct device *dev, struct device_attribute *attr,
 739                   const char *buf, size_t count)
 740 {
 741         struct kernfs_node *kn;
 742         struct scsi_device *sdev = to_scsi_device(dev);
 743
 744         /*
 745          * We need to try to get module, avoiding the module been removed
 746          * during delete.
 747          */
 748         if (scsi_device_get(sdev))
 749                 return -ENODEV;
 750
 751         kn = sysfs_break_active_protection(&dev->kobj, &attr->attr);
 752         WARN_ON_ONCE(!kn);
 753         /*
 754          * Concurrent writes into the "delete" sysfs attribute may trigger
 755          * concurrent calls to device_remove_file() and scsi_remove_device().
 756          * device_remove_file() handles concurrent removal calls by
 757          * serializing these and by ignoring the second and later removal
 758          * attempts.  Concurrent calls of scsi_remove_device() are
 759          * serialized. The second and later calls of scsi_remove_device() are
 760          * ignored because the first call of that function changes the device
 761          * state into SDEV_DEL.
 762          */
 763         device_remove_file(dev, attr);
 764         scsi_remove_device(sdev);
 765         if (kn)
 766                 sysfs_unbreak_active_protection(kn);
 767         scsi_device_put(sdev);
 768         return count;
 769 };
 770 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 771
 772 static ssize_t
 773 store_state_field(struct device *dev, struct device_attribute *attr,
 774                   const char *buf, size_t count)
 775 {
 776         int i, ret;
 777         struct scsi_device *sdev = to_scsi_device(dev);
 778         enum scsi_device_state state = 0;
 779
 780         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 781                 const int len = strlen(sdev_states[i].name);
 782                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 783                    buf[len] == '\n') {
 784                         state = sdev_states[i].value;
 785                         break;
 786                 }
 787         }
 788         switch (state) {
 789         case SDEV_RUNNING:
 790         case SDEV_OFFLINE:
 791                 break;
 792         default:
 793                 return -EINVAL;
 794         }
 795
 796         mutex_lock(&sdev->state_mutex);
 797         ret = scsi_device_set_state(sdev, state);
 798         /*
 799          * If the device state changes to SDEV_RUNNING, we need to run
 800          * the queue to avoid I/O hang.
 801          */
 802         if (ret == 0 && state == SDEV_RUNNING)
 803                 blk_mq_run_hw_queues(sdev->request_queue, true);
 804         mutex_unlock(&sdev->state_mutex);
 805
 806         return ret == 0 ? count : -EINVAL;
 807 }
 808
 809 static ssize_t
 810 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 811 {
 812         struct scsi_device *sdev = to_scsi_device(dev);
 813         const char *name = scsi_device_state_name(sdev->sdev_state);
 814
 815         if (!name)
 816                 return -EINVAL;
 817
 818         return snprintf(buf, 20, "%s\n", name);
 819 }
 820
 821 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 822
 823 static ssize_t
 824 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 825                       char *buf)
 826 {
 827         struct scsi_device *sdev = to_scsi_device(dev);
 828         const char *name = "none";
 829
 830         if (sdev->simple_tags)
 831                 name = "simple";
 832
 833         return snprintf(buf, 20, "%s\n", name);
 834 }
 835
 836 static ssize_t
 837 store_queue_type_field(struct device *dev, struct device_attribute *attr,
 838                        const char *buf, size_t count)
 839 {
 840         struct scsi_device *sdev = to_scsi_device(dev);
 841
 842         if (!sdev->tagged_supported)
 843                 return -EINVAL;
 844
 845         sdev_printk(KERN_INFO, sdev,
 846                     "ignoring write to deprecated queue_type attribute");
 847         return count;
 848 }
 849
 850 static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 851                    store_queue_type_field);
 852
 853 #define sdev_vpd_pg_attr(_page)                                         \
 854 static ssize_t                                                  \
 855 show_vpd_##_page(struct file *filp, struct kobject *kobj,       \
 856                  struct bin_attribute *bin_attr,                        \
 857                  char *buf, loff_t off, size_t count)                   \
 858 {                                                                       \
 859         struct device *dev = container_of(kobj, struct device, kobj);   \
 860         struct scsi_device *sdev = to_scsi_device(dev);                 \
 861         struct scsi_vpd *vpd_page;                                      \
 862         int ret = -EINVAL;                                              \
 863                                                                         \
 864         rcu_read_lock();                                                \
 865         vpd_page = rcu_dereference(sdev->vpd_##_page);                  \
 866         if (vpd_page)                                                   \
 867                 ret = memory_read_from_buffer(buf, count, &off,         \
 868                                 vpd_page->data, vpd_page->len);         \
 869         rcu_read_unlock();                                              \
 870         return ret;                                                     \
 871 }                                                                       \
 872 static struct bin_attribute dev_attr_vpd_##_page = {            \
 873         .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO },   \
 874         .size = 0,                                                      \
 875         .read = show_vpd_##_page,                                       \
 876 };
 877
 878 sdev_vpd_pg_attr(pg83);
 879 sdev_vpd_pg_attr(pg80);
 880 sdev_vpd_pg_attr(pg89);
 881 sdev_vpd_pg_attr(pg0);
 882
 883 static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
 884                             struct bin_attribute *bin_attr,
 885                             char *buf, loff_t off, size_t count)
 886 {
 887         struct device *dev = container_of(kobj, struct device, kobj);
 888         struct scsi_device *sdev = to_scsi_device(dev);
 889
 890         if (!sdev->inquiry)
 891                 return -EINVAL;
 892
 893         return memory_read_from_buffer(buf, count, &off, sdev->inquiry,
 894                                        sdev->inquiry_len);
 895 }
 896
 897 static struct bin_attribute dev_attr_inquiry = {
 898         .attr = {
 899                 .name = "inquiry",
 900                 .mode = S_IRUGO,
 901         },
 902         .size = 0,
 903         .read = show_inquiry,
 904 };
 905
 906 static ssize_t
 907 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
 908                         char *buf)
 909 {
 910         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 911 }
 912
 913 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 914
 915 #define show_sdev_iostat(field)                                         \
 916 static ssize_t                                                          \
 917 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 918                     char *buf)                                          \
 919 {                                                                       \
 920         struct scsi_device *sdev = to_scsi_device(dev);                 \
 921         unsigned long long count = atomic_read(&sdev->field);           \
 922         return snprintf(buf, 20, "0x%llx\n", count);                    \
 923 }                                                                       \
 924 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 925
 926 show_sdev_iostat(iorequest_cnt);
 927 show_sdev_iostat(iodone_cnt);
 928 show_sdev_iostat(ioerr_cnt);
 929
 930 static ssize_t
 931 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 932 {
 933         struct scsi_device *sdev;
 934         sdev = to_scsi_device(dev);
 935         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 936 }
 937 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 938
 939 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 940 static ssize_t                                                          \
 941 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 942                      char *buf)                                         \
 943 {                                                                       \
 944         struct scsi_device *sdev = to_scsi_device(dev);                 \
 945         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 946         return snprintf(buf, 20, "%d\n", val);                          \
 947 }
 948
 949 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 950 static ssize_t                                                          \
 951 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 952                       const char *buf, size_t count)                    \
 953 {                                                                       \
 954         struct scsi_device *sdev = to_scsi_device(dev);                 \
 955         int val = simple_strtoul(buf, NULL, 0);                         \
 956         if (val == 0)                                                   \
 957                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 958         else if (val == 1)                                              \
 959                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 960         else                                                            \
 961                 return -EINVAL;                                         \
 962         return count;                                                   \
 963 }
 964
 965 #define DECLARE_EVT(name, Cap_name)                                     \
 966         DECLARE_EVT_SHOW(name, Cap_name)                                \
 967         DECLARE_EVT_STORE(name, Cap_name)                               \
 968         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 969                            sdev_store_evt_##name);
 970 #define REF_EVT(name) &dev_attr_evt_##name.attr
 971
 972 DECLARE_EVT(media_change, MEDIA_CHANGE)
 973 DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
 974 DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
 975 DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
 976 DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
 977 DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
 978
 979 static ssize_t
 980 sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
 981                        const char *buf, size_t count)
 982 {
 983         int depth, retval;
 984         struct scsi_device *sdev = to_scsi_device(dev);
 985         struct scsi_host_template *sht = sdev->host->hostt;
 986
 987         if (!sht->change_queue_depth)
 988                 return -EINVAL;
 989
 990         depth = simple_strtoul(buf, NULL, 0);
 991
 992         if (depth < 1 || depth > sdev->host->can_queue)
 993                 return -EINVAL;
 994
 995         retval = sht->change_queue_depth(sdev, depth);
 996         if (retval < 0)
 997                 return retval;
 998
 999         sdev->max_queue_depth = sdev->queue_depth;
1000
1001         return count;
1002 }
1003 sdev_show_function(queue_depth, "%d\n");
1004
1005 static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
1006                    sdev_store_queue_depth);
1007
1008 static ssize_t
1009 sdev_show_wwid(struct device *dev, struct device_attribute *attr,
1010                     char *buf)
1011 {
1012         struct scsi_device *sdev = to_scsi_device(dev);
1013         ssize_t count;
1014
1015         count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
1016         if (count > 0) {
1017                 buf[count] = '\n';
1018                 count++;
1019         }
1020         return count;
1021 }
1022 static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
1023
1024 #define BLIST_FLAG_NAME(name)                                   \
1025         [const_ilog2((__force __u64)BLIST_##name)] = #name
1026 static const char *const sdev_bflags_name[] = {
1027 #include "scsi_devinfo_tbl.c"
1028 };
1029 #undef BLIST_FLAG_NAME
1030
1031 static ssize_t
1032 sdev_show_blacklist(struct device *dev, struct device_attribute *attr,
1033                     char *buf)
1034 {
1035         struct scsi_device *sdev = to_scsi_device(dev);
1036         int i;
1037         ssize_t len = 0;
1038
1039         for (i = 0; i < sizeof(sdev->sdev_bflags) * BITS_PER_BYTE; i++) {
1040                 const char *name = NULL;
1041
1042                 if (!(sdev->sdev_bflags & (__force blist_flags_t)BIT(i)))
1043                         continue;
1044                 if (i < ARRAY_SIZE(sdev_bflags_name) && sdev_bflags_name[i])
1045                         name = sdev_bflags_name[i];
1046
1047                 if (name)
1048                         len += snprintf(buf + len, PAGE_SIZE - len,
1049                                         "%s%s", len ? " " : "", name);
1050                 else
1051                         len += snprintf(buf + len, PAGE_SIZE - len,
1052                                         "%sINVALID_BIT(%d)", len ? " " : "", i);
1053         }
1054         if (len)
1055                 len += snprintf(buf + len, PAGE_SIZE - len, "\n");
1056         return len;
1057 }
1058 static DEVICE_ATTR(blacklist, S_IRUGO, sdev_show_blacklist, NULL);
1059
1060 #ifdef CONFIG_SCSI_DH
1061 static ssize_t
1062 sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
1063                    char *buf)
1064 {
1065         struct scsi_device *sdev = to_scsi_device(dev);
1066
1067         if (!sdev->handler)
1068                 return snprintf(buf, 20, "detached\n");
1069
1070         return snprintf(buf, 20, "%s\n", sdev->handler->name);
1071 }
1072
1073 static ssize_t
1074 sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
1075                     const char *buf, size_t count)
1076 {
1077         struct scsi_device *sdev = to_scsi_device(dev);
1078         int err = -EINVAL;
1079
1080         if (sdev->sdev_state == SDEV_CANCEL ||
1081             sdev->sdev_state == SDEV_DEL)
1082                 return -ENODEV;
1083
1084         if (!sdev->handler) {
1085                 /*
1086                  * Attach to a device handler
1087                  */
1088                 err = scsi_dh_attach(sdev->request_queue, buf);
1089         } else if (!strncmp(buf, "activate", 8)) {
1090                 /*
1091                  * Activate a device handler
1092                  */
1093                 if (sdev->handler->activate)
1094                         err = sdev->handler->activate(sdev, NULL, NULL);
1095                 else
1096                         err = 0;
1097         } else if (!strncmp(buf, "detach", 6)) {
1098                 /*
1099                  * Detach from a device handler
1100                  */
1101                 sdev_printk(KERN_WARNING, sdev,
1102                             "can't detach handler %s.\n",
1103                             sdev->handler->name);
1104                 err = -EINVAL;
1105         }
1106
1107         return err < 0 ? err : count;
1108 }
1109
1110 static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
1111                    sdev_store_dh_state);
1112
1113 static ssize_t
1114 sdev_show_access_state(struct device *dev,
1115                        struct device_attribute *attr,
1116                        char *buf)
1117 {
1118         struct scsi_device *sdev = to_scsi_device(dev);
1119         unsigned char access_state;
1120         const char *access_state_name;
1121
1122         if (!sdev->handler)
1123                 return -EINVAL;
1124
1125         access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK);
1126         access_state_name = scsi_access_state_name(access_state);
1127
1128         return sprintf(buf, "%s\n",
1129                        access_state_name ? access_state_name : "unknown");
1130 }
1131 static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL);
1132
1133 static ssize_t
1134 sdev_show_preferred_path(struct device *dev,
1135                          struct device_attribute *attr,
1136                          char *buf)
1137 {
1138         struct scsi_device *sdev = to_scsi_device(dev);
1139
1140         if (!sdev->handler)
1141                 return -EINVAL;
1142
1143         if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED)
1144                 return sprintf(buf, "1\n");
1145         else
1146                 return sprintf(buf, "0\n");
1147 }
1148 static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL);
1149 #endif
1150
1151 static ssize_t
1152 sdev_show_queue_ramp_up_period(struct device *dev,
1153                                struct device_attribute *attr,
1154                                char *buf)
1155 {
1156         struct scsi_device *sdev;
1157         sdev = to_scsi_device(dev);
1158         return snprintf(buf, 20, "%u\n",
1159                         jiffies_to_msecs(sdev->queue_ramp_up_period));
1160 }
1161
1162 static ssize_t
1163 sdev_store_queue_ramp_up_period(struct device *dev,
1164                                 struct device_attribute *attr,
1165                                 const char *buf, size_t count)
1166 {
1167         struct scsi_device *sdev = to_scsi_device(dev);
1168         unsigned int period;
1169
1170         if (kstrtouint(buf, 10, &period))
1171                 return -EINVAL;
1172
1173         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
1174         return count;
1175 }
1176
1177 static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
1178                    sdev_show_queue_ramp_up_period,
1179                    sdev_store_queue_ramp_up_period);
1180
1181 static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
1182                                          struct attribute *attr, int i)
1183 {
1184         struct device *dev = container_of(kobj, struct device, kobj);
1185         struct scsi_device *sdev = to_scsi_device(dev);
1186
1187
1188         if (attr == &dev_attr_queue_depth.attr &&
1189             !sdev->host->hostt->change_queue_depth)
1190                 return S_IRUGO;
1191
1192         if (attr == &dev_attr_queue_ramp_up_period.attr &&
1193             !sdev->host->hostt->change_queue_depth)
1194                 return 0;
1195
1196 #ifdef CONFIG_SCSI_DH
1197         if (attr == &dev_attr_access_state.attr &&
1198             !sdev->handler)
1199                 return 0;
1200         if (attr == &dev_attr_preferred_path.attr &&
1201             !sdev->handler)
1202                 return 0;
1203 #endif
1204         return attr->mode;
1205 }
1206
1207 static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
1208                                              struct bin_attribute *attr, int i)
1209 {
1210         struct device *dev = container_of(kobj, struct device, kobj);
1211         struct scsi_device *sdev = to_scsi_device(dev);
1212
1213
1214         if (attr == &dev_attr_vpd_pg0 && !sdev->vpd_pg0)
1215                 return 0;
1216
1217         if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80)
1218                 return 0;
1219
1220         if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83)
1221                 return 0;
1222
1223         if (attr == &dev_attr_vpd_pg89 && !sdev->vpd_pg89)
1224                 return 0;
1225
1226         return S_IRUGO;
1227 }
1228
1229 /* Default template for device attributes.  May NOT be modified */
1230 static struct attribute *scsi_sdev_attrs[] = {
1231         &dev_attr_device_blocked.attr,
1232         &dev_attr_type.attr,
1233         &dev_attr_scsi_level.attr,
1234         &dev_attr_device_busy.attr,
1235         &dev_attr_vendor.attr,
1236         &dev_attr_model.attr,
1237         &dev_attr_rev.attr,
1238         &dev_attr_rescan.attr,
1239         &dev_attr_delete.attr,
1240         &dev_attr_state.attr,
1241         &dev_attr_timeout.attr,
1242         &dev_attr_eh_timeout.attr,
1243         &dev_attr_iocounterbits.attr,
1244         &dev_attr_iorequest_cnt.attr,
1245         &dev_attr_iodone_cnt.attr,
1246         &dev_attr_ioerr_cnt.attr,
1247         &dev_attr_modalias.attr,
1248         &dev_attr_queue_depth.attr,
1249         &dev_attr_queue_type.attr,
1250         &dev_attr_wwid.attr,
1251         &dev_attr_blacklist.attr,
1252 #ifdef CONFIG_SCSI_DH
1253         &dev_attr_dh_state.attr,
1254         &dev_attr_access_state.attr,
1255         &dev_attr_preferred_path.attr,
1256 #endif
1257         &dev_attr_queue_ramp_up_period.attr,
1258         REF_EVT(media_change),
1259         REF_EVT(inquiry_change_reported),
1260         REF_EVT(capacity_change_reported),
1261         REF_EVT(soft_threshold_reached),
1262         REF_EVT(mode_parameter_change_reported),
1263         REF_EVT(lun_change_reported),
1264         NULL
1265 };
1266
1267 static struct bin_attribute *scsi_sdev_bin_attrs[] = {
1268         &dev_attr_vpd_pg0,
1269         &dev_attr_vpd_pg83,
1270         &dev_attr_vpd_pg80,
1271         &dev_attr_vpd_pg89,
1272         &dev_attr_inquiry,
1273         NULL
1274 };
1275 static struct attribute_group scsi_sdev_attr_group = {
1276         .attrs =        scsi_sdev_attrs,
1277         .bin_attrs =    scsi_sdev_bin_attrs,
1278         .is_visible =   scsi_sdev_attr_is_visible,
1279         .is_bin_visible = scsi_sdev_bin_attr_is_visible,
1280 };
1281
1282 static const struct attribute_group *scsi_sdev_attr_groups[] = {
1283         &scsi_sdev_attr_group,
1284         NULL
1285 };
1286
1287 static int scsi_target_add(struct scsi_target *starget)
1288 {
1289         int error;
1290
1291         if (starget->state != STARGET_CREATED)
1292                 return 0;
1293
1294         error = device_add(&starget->dev);
1295         if (error) {
1296                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
1297                 return error;
1298         }
1299         transport_add_device(&starget->dev);
1300         starget->state = STARGET_RUNNING;
1301
1302         pm_runtime_set_active(&starget->dev);
1303         pm_runtime_enable(&starget->dev);
1304         device_enable_async_suspend(&starget->dev);
1305
1306         return 0;
1307 }
1308
1309 /**
1310  * scsi_sysfs_add_sdev - add scsi device to sysfs
1311  * @sdev:       scsi_device to add
1312  *
1313  * Return value:
1314  *      0 on Success / non-zero on Failure
1315  **/
1316 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1317 {
1318         int error, i;
1319         struct request_queue *rq = sdev->request_queue;
1320         struct scsi_target *starget = sdev->sdev_target;
1321
1322         error = scsi_target_add(starget);
1323         if (error)
1324                 return error;
1325
1326         transport_configure_device(&starget->dev);
1327
1328         device_enable_async_suspend(&sdev->sdev_gendev);
1329         scsi_autopm_get_target(starget);
1330         pm_runtime_set_active(&sdev->sdev_gendev);
1331         if (!sdev->rpm_autosuspend)
1332                 pm_runtime_forbid(&sdev->sdev_gendev);
1333         pm_runtime_enable(&sdev->sdev_gendev);
1334         scsi_autopm_put_target(starget);
1335
1336         scsi_autopm_get_device(sdev);
1337
1338         scsi_dh_add_device(sdev);
1339
1340         error = device_add(&sdev->sdev_gendev);
1341         if (error) {
1342                 sdev_printk(KERN_INFO, sdev,
1343                                 "failed to add device: %d\n", error);
1344                 return error;
1345         }
1346
1347         device_enable_async_suspend(&sdev->sdev_dev);
1348         error = device_add(&sdev->sdev_dev);
1349         if (error) {
1350                 sdev_printk(KERN_INFO, sdev,
1351                                 "failed to add class device: %d\n", error);
1352                 device_del(&sdev->sdev_gendev);
1353                 return error;
1354         }
1355         transport_add_device(&sdev->sdev_gendev);
1356         sdev->is_visible = 1;
1357
1358         error = bsg_scsi_register_queue(rq, &sdev->sdev_gendev);
1359         if (error)
1360                 /* we're treating error on bsg register as non-fatal,
1361                  * so pretend nothing went wrong */
1362                 sdev_printk(KERN_INFO, sdev,
1363                             "Failed to register bsg queue, errno=%d\n", error);
1364
1365         /* add additional host specific attributes */
1366         if (sdev->host->hostt->sdev_attrs) {
1367                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
1368                         error = device_create_file(&sdev->sdev_gendev,
1369                                         sdev->host->hostt->sdev_attrs[i]);
1370                         if (error)
1371                                 return error;
1372                 }
1373         }
1374
1375         if (sdev->host->hostt->sdev_groups) {
1376                 error = sysfs_create_groups(&sdev->sdev_gendev.kobj,
1377                                 sdev->host->hostt->sdev_groups);
1378                 if (error)
1379                         return error;
1380         }
1381
1382         scsi_autopm_put_device(sdev);
1383         return error;
1384 }
1385
1386 void __scsi_remove_device(struct scsi_device *sdev)
1387 {
1388         struct device *dev = &sdev->sdev_gendev;
1389         int res;
1390
1391         /*
1392          * This cleanup path is not reentrant and while it is impossible
1393          * to get a new reference with scsi_device_get() someone can still
1394          * hold a previously acquired one.
1395          */
1396         if (sdev->sdev_state == SDEV_DEL)
1397                 return;
1398
1399         if (sdev->is_visible) {
1400                 /*
1401                  * If scsi_internal_target_block() is running concurrently,
1402                  * wait until it has finished before changing the device state.
1403                  */
1404                 mutex_lock(&sdev->state_mutex);
1405                 /*
1406                  * If blocked, we go straight to DEL and restart the queue so
1407                  * any commands issued during driver shutdown (like sync
1408                  * cache) are errored immediately.
1409                  */
1410                 res = scsi_device_set_state(sdev, SDEV_CANCEL);
1411                 if (res != 0) {
1412                         res = scsi_device_set_state(sdev, SDEV_DEL);
1413                         if (res == 0)
1414                                 scsi_start_queue(sdev);
1415                 }
1416                 mutex_unlock(&sdev->state_mutex);
1417
1418                 if (res != 0)
1419                         return;
1420
1421                 if (sdev->host->hostt->sdev_groups)
1422                         sysfs_remove_groups(&sdev->sdev_gendev.kobj,
1423                                         sdev->host->hostt->sdev_groups);
1424
1425                 bsg_unregister_queue(sdev->request_queue);
1426                 device_unregister(&sdev->sdev_dev);
1427                 transport_remove_device(dev);
1428                 device_del(dev);
1429         } else
1430                 put_device(&sdev->sdev_dev);
1431
1432         /*
1433          * Stop accepting new requests and wait until all queuecommand() and
1434          * scsi_run_queue() invocations have finished before tearing down the
1435          * device.
1436          */
1437         mutex_lock(&sdev->state_mutex);
1438         scsi_device_set_state(sdev, SDEV_DEL);
1439         mutex_unlock(&sdev->state_mutex);
1440
1441         blk_cleanup_queue(sdev->request_queue);
1442         cancel_work_sync(&sdev->requeue_work);
1443
1444         if (sdev->host->hostt->slave_destroy)
1445                 sdev->host->hostt->slave_destroy(sdev);
1446         transport_destroy_device(dev);
1447
1448         /*
1449          * Paired with the kref_get() in scsi_sysfs_initialize().  We have
1450          * remoed sysfs visibility from the device, so make the target
1451          * invisible if this was the last device underneath it.
1452          */
1453         scsi_target_reap(scsi_target(sdev));
1454
1455         put_device(dev);
1456 }
1457
1458 /**
1459  * scsi_remove_device - unregister a device from the scsi bus
1460  * @sdev:       scsi_device to unregister
1461  **/
1462 void scsi_remove_device(struct scsi_device *sdev)
1463 {
1464         struct Scsi_Host *shost = sdev->host;
1465
1466         mutex_lock(&shost->scan_mutex);
1467         __scsi_remove_device(sdev);
1468         mutex_unlock(&shost->scan_mutex);
1469 }
1470 EXPORT_SYMBOL(scsi_remove_device);
1471
1472 static void __scsi_remove_target(struct scsi_target *starget)
1473 {
1474         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1475         unsigned long flags;
1476         struct scsi_device *sdev;
1477
1478         spin_lock_irqsave(shost->host_lock, flags);
1479  restart:
1480         list_for_each_entry(sdev, &shost->__devices, siblings) {
1481                 /*
1482                  * We cannot call scsi_device_get() here, as
1483                  * we might've been called from rmmod() causing
1484                  * scsi_device_get() to fail the module_is_live()
1485                  * check.
1486                  */
1487                 if (sdev->channel != starget->channel ||
1488                     sdev->id != starget->id)
1489                         continue;
1490                 if (sdev->sdev_state == SDEV_DEL ||
1491                     sdev->sdev_state == SDEV_CANCEL ||
1492                     !get_device(&sdev->sdev_gendev))
1493                         continue;
1494                 spin_unlock_irqrestore(shost->host_lock, flags);
1495                 scsi_remove_device(sdev);
1496                 put_device(&sdev->sdev_gendev);
1497                 spin_lock_irqsave(shost->host_lock, flags);
1498                 goto restart;
1499         }
1500         spin_unlock_irqrestore(shost->host_lock, flags);
1501 }
1502
1503 /**
1504  * scsi_remove_target - try to remove a target and all its devices
1505  * @dev: generic starget or parent of generic stargets to be removed
1506  *
1507  * Note: This is slightly racy.  It is possible that if the user
1508  * requests the addition of another device then the target won't be
1509  * removed.
1510  */
1511 void scsi_remove_target(struct device *dev)
1512 {
1513         struct Scsi_Host *shost = dev_to_shost(dev->parent);
1514         struct scsi_target *starget;
1515         unsigned long flags;
1516
1517 restart:
1518         spin_lock_irqsave(shost->host_lock, flags);
1519         list_for_each_entry(starget, &shost->__targets, siblings) {
1520                 if (starget->state == STARGET_DEL ||
1521                     starget->state == STARGET_REMOVE ||
1522                     starget->state == STARGET_CREATED_REMOVE)
1523                         continue;
1524                 if (starget->dev.parent == dev || &starget->dev == dev) {
1525                         kref_get(&starget->reap_ref);
1526                         if (starget->state == STARGET_CREATED)
1527                                 starget->state = STARGET_CREATED_REMOVE;
1528                         else
1529                                 starget->state = STARGET_REMOVE;
1530                         spin_unlock_irqrestore(shost->host_lock, flags);
1531                         __scsi_remove_target(starget);
1532                         scsi_target_reap(starget);
1533                         goto restart;
1534                 }
1535         }
1536         spin_unlock_irqrestore(shost->host_lock, flags);
1537 }
1538 EXPORT_SYMBOL(scsi_remove_target);
1539
1540 int scsi_register_driver(struct device_driver *drv)
1541 {
1542         drv->bus = &scsi_bus_type;
1543
1544         return driver_register(drv);
1545 }
1546 EXPORT_SYMBOL(scsi_register_driver);
1547
1548 int scsi_register_interface(struct class_interface *intf)
1549 {
1550         intf->class = &sdev_class;
1551
1552         return class_interface_register(intf);
1553 }
1554 EXPORT_SYMBOL(scsi_register_interface);
1555
1556 /**
1557  * scsi_sysfs_add_host - add scsi host to subsystem
1558  * @shost:     scsi host struct to add to subsystem
1559  **/
1560 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1561 {
1562         int error, i;
1563
1564         /* add host specific attributes */
1565         if (shost->hostt->shost_attrs) {
1566                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1567                         error = device_create_file(&shost->shost_dev,
1568                                         shost->hostt->shost_attrs[i]);
1569                         if (error)
1570                                 return error;
1571                 }
1572         }
1573
1574         transport_register_device(&shost->shost_gendev);
1575         transport_configure_device(&shost->shost_gendev);
1576         return 0;
1577 }
1578
1579 static struct device_type scsi_dev_type = {
1580         .name =         "scsi_device",
1581         .release =      scsi_device_dev_release,
1582         .groups =       scsi_sdev_attr_groups,
1583 };
1584
1585 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1586 {
1587         unsigned long flags;
1588         struct Scsi_Host *shost = sdev->host;
1589         struct scsi_target  *starget = sdev->sdev_target;
1590
1591         device_initialize(&sdev->sdev_gendev);
1592         sdev->sdev_gendev.bus = &scsi_bus_type;
1593         sdev->sdev_gendev.type = &scsi_dev_type;
1594         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu",
1595                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1596
1597         device_initialize(&sdev->sdev_dev);
1598         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1599         sdev->sdev_dev.class = &sdev_class;
1600         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu",
1601                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1602         /*
1603          * Get a default scsi_level from the target (derived from sibling
1604          * devices).  This is the best we can do for guessing how to set
1605          * sdev->lun_in_cdb for the initial INQUIRY command.  For LUN 0 the
1606          * setting doesn't matter, because all the bits are zero anyway.
1607          * But it does matter for higher LUNs.
1608          */
1609         sdev->scsi_level = starget->scsi_level;
1610         if (sdev->scsi_level <= SCSI_2 &&
1611                         sdev->scsi_level != SCSI_UNKNOWN &&
1612                         !shost->no_scsi2_lun_in_cdb)
1613                 sdev->lun_in_cdb = 1;
1614
1615         transport_setup_device(&sdev->sdev_gendev);
1616         spin_lock_irqsave(shost->host_lock, flags);
1617         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1618         list_add_tail(&sdev->siblings, &shost->__devices);
1619         spin_unlock_irqrestore(shost->host_lock, flags);
1620         /*
1621          * device can now only be removed via __scsi_remove_device() so hold
1622          * the target.  Target will be held in CREATED state until something
1623          * beneath it becomes visible (in which case it moves to RUNNING)
1624          */
1625         kref_get(&starget->reap_ref);
1626 }
1627
1628 int scsi_is_sdev_device(const struct device *dev)
1629 {
1630         return dev->type == &scsi_dev_type;
1631 }
1632 EXPORT_SYMBOL(scsi_is_sdev_device);
1633
1634 /* A blank transport template that is used in drivers that don't
1635  * yet implement Transport Attributes */
1636 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };