drivers/scsi/scsi_sysfs.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * scsi_sysfs.c
   4  *
   5  * SCSI sysfs interface routines.
   6  *
   7  * Created to pull SCSI mid layer sysfs routines into one file.
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/slab.h>
  12 #include <linux/init.h>
  13 #include <linux/blkdev.h>
  14 #include <linux/device.h>
  15 #include <linux/pm_runtime.h>
  16
  17 #include <scsi/scsi.h>
  18 #include <scsi/scsi_device.h>
  19 #include <scsi/scsi_host.h>
  20 #include <scsi/scsi_tcq.h>
  21 #include <scsi/scsi_dh.h>
  22 #include <scsi/scsi_transport.h>
  23 #include <scsi/scsi_driver.h>
  24 #include <scsi/scsi_devinfo.h>
  25
  26 #include "scsi_priv.h"
  27 #include "scsi_logging.h"
  28
  29 static struct device_type scsi_dev_type;
  30
  31 static const struct {
  32         enum scsi_device_state  value;
  33         char                    *name;
  34 } sdev_states[] = {
  35         { SDEV_CREATED, "created" },
  36         { SDEV_RUNNING, "running" },
  37         { SDEV_CANCEL, "cancel" },
  38         { SDEV_DEL, "deleted" },
  39         { SDEV_QUIESCE, "quiesce" },
  40         { SDEV_OFFLINE, "offline" },
  41         { SDEV_TRANSPORT_OFFLINE, "transport-offline" },
  42         { SDEV_BLOCK,   "blocked" },
  43         { SDEV_CREATED_BLOCK, "created-blocked" },
  44 };
  45
  46 const char *scsi_device_state_name(enum scsi_device_state state)
  47 {
  48         int i;
  49         char *name = NULL;
  50
  51         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
  52                 if (sdev_states[i].value == state) {
  53                         name = sdev_states[i].name;
  54                         break;
  55                 }
  56         }
  57         return name;
  58 }
  59
  60 static const struct {
  61         enum scsi_host_state    value;
  62         char                    *name;
  63 } shost_states[] = {
  64         { SHOST_CREATED, "created" },
  65         { SHOST_RUNNING, "running" },
  66         { SHOST_CANCEL, "cancel" },
  67         { SHOST_DEL, "deleted" },
  68         { SHOST_RECOVERY, "recovery" },
  69         { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
  70         { SHOST_DEL_RECOVERY, "deleted/recovery", },
  71 };
  72 const char *scsi_host_state_name(enum scsi_host_state state)
  73 {
  74         int i;
  75         char *name = NULL;
  76
  77         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
  78                 if (shost_states[i].value == state) {
  79                         name = shost_states[i].name;
  80                         break;
  81                 }
  82         }
  83         return name;
  84 }
  85
  86 #ifdef CONFIG_SCSI_DH
  87 static const struct {
  88         unsigned char   value;
  89         char            *name;
  90 } sdev_access_states[] = {
  91         { SCSI_ACCESS_STATE_OPTIMAL, "active/optimized" },
  92         { SCSI_ACCESS_STATE_ACTIVE, "active/non-optimized" },
  93         { SCSI_ACCESS_STATE_STANDBY, "standby" },
  94         { SCSI_ACCESS_STATE_UNAVAILABLE, "unavailable" },
  95         { SCSI_ACCESS_STATE_LBA, "lba-dependent" },
  96         { SCSI_ACCESS_STATE_OFFLINE, "offline" },
  97         { SCSI_ACCESS_STATE_TRANSITIONING, "transitioning" },
  98 };
  99
 100 static const char *scsi_access_state_name(unsigned char state)
 101 {
 102         int i;
 103         char *name = NULL;
 104
 105         for (i = 0; i < ARRAY_SIZE(sdev_access_states); i++) {
 106                 if (sdev_access_states[i].value == state) {
 107                         name = sdev_access_states[i].name;
 108                         break;
 109                 }
 110         }
 111         return name;
 112 }
 113 #endif
 114
 115 static int check_set(unsigned long long *val, char *src)
 116 {
 117         char *last;
 118
 119         if (strcmp(src, "-") == 0) {
 120                 *val = SCAN_WILD_CARD;
 121         } else {
 122                 /*
 123                  * Doesn't check for int overflow
 124                  */
 125                 *val = simple_strtoull(src, &last, 0);
 126                 if (*last != '\0')
 127                         return 1;
 128         }
 129         return 0;
 130 }
 131
 132 static int scsi_scan(struct Scsi_Host *shost, const char *str)
 133 {
 134         char s1[15], s2[15], s3[17], junk;
 135         unsigned long long channel, id, lun;
 136         int res;
 137
 138         res = sscanf(str, "%10s %10s %16s %c", s1, s2, s3, &junk);
 139         if (res != 3)
 140                 return -EINVAL;
 141         if (check_set(&channel, s1))
 142                 return -EINVAL;
 143         if (check_set(&id, s2))
 144                 return -EINVAL;
 145         if (check_set(&lun, s3))
 146                 return -EINVAL;
 147         if (shost->transportt->user_scan)
 148                 res = shost->transportt->user_scan(shost, channel, id, lun);
 149         else
 150                 res = scsi_scan_host_selected(shost, channel, id, lun,
 151                                               SCSI_SCAN_MANUAL);
 152         return res;
 153 }
 154
 155 /*
 156  * shost_show_function: macro to create an attr function that can be used to
 157  * show a non-bit field.
 158  */
 159 #define shost_show_function(name, field, format_string)                 \
 160 static ssize_t                                                          \
 161 show_##name (struct device *dev, struct device_attribute *attr,         \
 162              char *buf)                                                 \
 163 {                                                                       \
 164         struct Scsi_Host *shost = class_to_shost(dev);                  \
 165         return snprintf (buf, 20, format_string, shost->field);         \
 166 }
 167
 168 /*
 169  * shost_rd_attr: macro to create a function and attribute variable for a
 170  * read only field.
 171  */
 172 #define shost_rd_attr2(name, field, format_string)                      \
 173         shost_show_function(name, field, format_string)                 \
 174 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
 175
 176 #define shost_rd_attr(field, format_string) \
 177 shost_rd_attr2(field, field, format_string)
 178
 179 /*
 180  * Create the actual show/store functions and data structures.
 181  */
 182
 183 static ssize_t
 184 store_scan(struct device *dev, struct device_attribute *attr,
 185            const char *buf, size_t count)
 186 {
 187         struct Scsi_Host *shost = class_to_shost(dev);
 188         int res;
 189
 190         res = scsi_scan(shost, buf);
 191         if (res == 0)
 192                 res = count;
 193         return res;
 194 };
 195 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
 196
 197 static ssize_t
 198 store_shost_state(struct device *dev, struct device_attribute *attr,
 199                   const char *buf, size_t count)
 200 {
 201         int i;
 202         struct Scsi_Host *shost = class_to_shost(dev);
 203         enum scsi_host_state state = 0;
 204
 205         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
 206                 const int len = strlen(shost_states[i].name);
 207                 if (strncmp(shost_states[i].name, buf, len) == 0 &&
 208                    buf[len] == '\n') {
 209                         state = shost_states[i].value;
 210                         break;
 211                 }
 212         }
 213         if (!state)
 214                 return -EINVAL;
 215
 216         if (scsi_host_set_state(shost, state))
 217                 return -EINVAL;
 218         return count;
 219 }
 220
 221 static ssize_t
 222 show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
 223 {
 224         struct Scsi_Host *shost = class_to_shost(dev);
 225         const char *name = scsi_host_state_name(shost->shost_state);
 226
 227         if (!name)
 228                 return -EINVAL;
 229
 230         return snprintf(buf, 20, "%s\n", name);
 231 }
 232
 233 /* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
 234 static struct device_attribute dev_attr_hstate =
 235         __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
 236
 237 static ssize_t
 238 show_shost_mode(unsigned int mode, char *buf)
 239 {
 240         ssize_t len = 0;
 241
 242         if (mode & MODE_INITIATOR)
 243                 len = sprintf(buf, "%s", "Initiator");
 244
 245         if (mode & MODE_TARGET)
 246                 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
 247
 248         len += sprintf(buf + len, "\n");
 249
 250         return len;
 251 }
 252
 253 static ssize_t
 254 show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
 255                           char *buf)
 256 {
 257         struct Scsi_Host *shost = class_to_shost(dev);
 258         unsigned int supported_mode = shost->hostt->supported_mode;
 259
 260         if (supported_mode == MODE_UNKNOWN)
 261                 /* by default this should be initiator */
 262                 supported_mode = MODE_INITIATOR;
 263
 264         return show_shost_mode(supported_mode, buf);
 265 }
 266
 267 static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
 268
 269 static ssize_t
 270 show_shost_active_mode(struct device *dev,
 271                        struct device_attribute *attr, char *buf)
 272 {
 273         struct Scsi_Host *shost = class_to_shost(dev);
 274
 275         if (shost->active_mode == MODE_UNKNOWN)
 276                 return snprintf(buf, 20, "unknown\n");
 277         else
 278                 return show_shost_mode(shost->active_mode, buf);
 279 }
 280
 281 static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
 282
 283 static int check_reset_type(const char *str)
 284 {
 285         if (sysfs_streq(str, "adapter"))
 286                 return SCSI_ADAPTER_RESET;
 287         else if (sysfs_streq(str, "firmware"))
 288                 return SCSI_FIRMWARE_RESET;
 289         else
 290                 return 0;
 291 }
 292
 293 static ssize_t
 294 store_host_reset(struct device *dev, struct device_attribute *attr,
 295                 const char *buf, size_t count)
 296 {
 297         struct Scsi_Host *shost = class_to_shost(dev);
 298         struct scsi_host_template *sht = shost->hostt;
 299         int ret = -EINVAL;
 300         int type;
 301
 302         type = check_reset_type(buf);
 303         if (!type)
 304                 goto exit_store_host_reset;
 305
 306         if (sht->host_reset)
 307                 ret = sht->host_reset(shost, type);
 308         else
 309                 ret = -EOPNOTSUPP;
 310
 311 exit_store_host_reset:
 312         if (ret == 0)
 313                 ret = count;
 314         return ret;
 315 }
 316
 317 static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
 318
 319 static ssize_t
 320 show_shost_eh_deadline(struct device *dev,
 321                       struct device_attribute *attr, char *buf)
 322 {
 323         struct Scsi_Host *shost = class_to_shost(dev);
 324
 325         if (shost->eh_deadline == -1)
 326                 return snprintf(buf, strlen("off") + 2, "off\n");
 327         return sprintf(buf, "%u\n", shost->eh_deadline / HZ);
 328 }
 329
 330 static ssize_t
 331 store_shost_eh_deadline(struct device *dev, struct device_attribute *attr,
 332                 const char *buf, size_t count)
 333 {
 334         struct Scsi_Host *shost = class_to_shost(dev);
 335         int ret = -EINVAL;
 336         unsigned long deadline, flags;
 337
 338         if (shost->transportt &&
 339             (shost->transportt->eh_strategy_handler ||
 340              !shost->hostt->eh_host_reset_handler))
 341                 return ret;
 342
 343         if (!strncmp(buf, "off", strlen("off")))
 344                 deadline = -1;
 345         else {
 346                 ret = kstrtoul(buf, 10, &deadline);
 347                 if (ret)
 348                         return ret;
 349                 if (deadline * HZ > UINT_MAX)
 350                         return -EINVAL;
 351         }
 352
 353         spin_lock_irqsave(shost->host_lock, flags);
 354         if (scsi_host_in_recovery(shost))
 355                 ret = -EBUSY;
 356         else {
 357                 if (deadline == -1)
 358                         shost->eh_deadline = -1;
 359                 else
 360                         shost->eh_deadline = deadline * HZ;
 361
 362                 ret = count;
 363         }
 364         spin_unlock_irqrestore(shost->host_lock, flags);
 365
 366         return ret;
 367 }
 368
 369 static DEVICE_ATTR(eh_deadline, S_IRUGO | S_IWUSR, show_shost_eh_deadline, store_shost_eh_deadline);
 370
 371 shost_rd_attr(unique_id, "%u\n");
 372 shost_rd_attr(cmd_per_lun, "%hd\n");
 373 shost_rd_attr(can_queue, "%hd\n");
 374 shost_rd_attr(sg_tablesize, "%hu\n");
 375 shost_rd_attr(sg_prot_tablesize, "%hu\n");
 376 shost_rd_attr(unchecked_isa_dma, "%d\n");
 377 shost_rd_attr(prot_capabilities, "%u\n");
 378 shost_rd_attr(prot_guard_type, "%hd\n");
 379 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
 380
 381 static ssize_t
 382 show_host_busy(struct device *dev, struct device_attribute *attr, char *buf)
 383 {
 384         struct Scsi_Host *shost = class_to_shost(dev);
 385         return snprintf(buf, 20, "%d\n", scsi_host_busy(shost));
 386 }
 387 static DEVICE_ATTR(host_busy, S_IRUGO, show_host_busy, NULL);
 388
 389 static ssize_t
 390 show_use_blk_mq(struct device *dev, struct device_attribute *attr, char *buf)
 391 {
 392         return sprintf(buf, "1\n");
 393 }
 394 static DEVICE_ATTR(use_blk_mq, S_IRUGO, show_use_blk_mq, NULL);
 395
 396 static struct attribute *scsi_sysfs_shost_attrs[] = {
 397         &dev_attr_use_blk_mq.attr,
 398         &dev_attr_unique_id.attr,
 399         &dev_attr_host_busy.attr,
 400         &dev_attr_cmd_per_lun.attr,
 401         &dev_attr_can_queue.attr,
 402         &dev_attr_sg_tablesize.attr,
 403         &dev_attr_sg_prot_tablesize.attr,
 404         &dev_attr_unchecked_isa_dma.attr,
 405         &dev_attr_proc_name.attr,
 406         &dev_attr_scan.attr,
 407         &dev_attr_hstate.attr,
 408         &dev_attr_supported_mode.attr,
 409         &dev_attr_active_mode.attr,
 410         &dev_attr_prot_capabilities.attr,
 411         &dev_attr_prot_guard_type.attr,
 412         &dev_attr_host_reset.attr,
 413         &dev_attr_eh_deadline.attr,
 414         NULL
 415 };
 416
 417 static struct attribute_group scsi_shost_attr_group = {
 418         .attrs =        scsi_sysfs_shost_attrs,
 419 };
 420
 421 const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
 422         &scsi_shost_attr_group,
 423         NULL
 424 };
 425
 426 static void scsi_device_cls_release(struct device *class_dev)
 427 {
 428         struct scsi_device *sdev;
 429
 430         sdev = class_to_sdev(class_dev);
 431         put_device(&sdev->sdev_gendev);
 432 }
 433
 434 static void scsi_device_dev_release_usercontext(struct work_struct *work)
 435 {
 436         struct scsi_device *sdev;
 437         struct device *parent;
 438         struct list_head *this, *tmp;
 439         struct scsi_vpd *vpd_pg80 = NULL, *vpd_pg83 = NULL;
 440         unsigned long flags;
 441         struct module *mod;
 442
 443         sdev = container_of(work, struct scsi_device, ew.work);
 444
 445         mod = sdev->host->hostt->module;
 446
 447         scsi_dh_release_device(sdev);
 448
 449         parent = sdev->sdev_gendev.parent;
 450
 451         spin_lock_irqsave(sdev->host->host_lock, flags);
 452         list_del(&sdev->siblings);
 453         list_del(&sdev->same_target_siblings);
 454         list_del(&sdev->starved_entry);
 455         spin_unlock_irqrestore(sdev->host->host_lock, flags);
 456
 457         cancel_work_sync(&sdev->event_work);
 458
 459         list_for_each_safe(this, tmp, &sdev->event_list) {
 460                 struct scsi_event *evt;
 461
 462                 evt = list_entry(this, struct scsi_event, node);
 463                 list_del(&evt->node);
 464                 kfree(evt);
 465         }
 466
 467         blk_put_queue(sdev->request_queue);
 468         /* NULL queue means the device can't be used */
 469         sdev->request_queue = NULL;
 470
 471         mutex_lock(&sdev->inquiry_mutex);
 472         rcu_swap_protected(sdev->vpd_pg80, vpd_pg80,
 473                            lockdep_is_held(&sdev->inquiry_mutex));
 474         rcu_swap_protected(sdev->vpd_pg83, vpd_pg83,
 475                            lockdep_is_held(&sdev->inquiry_mutex));
 476         mutex_unlock(&sdev->inquiry_mutex);
 477
 478         if (vpd_pg83)
 479                 kfree_rcu(vpd_pg83, rcu);
 480         if (vpd_pg80)
 481                 kfree_rcu(vpd_pg80, rcu);
 482         kfree(sdev->inquiry);
 483         kfree(sdev);
 484
 485         if (parent)
 486                 put_device(parent);
 487         module_put(mod);
 488 }
 489
 490 static void scsi_device_dev_release(struct device *dev)
 491 {
 492         struct scsi_device *sdp = to_scsi_device(dev);
 493
 494         /* Set module pointer as NULL in case of module unloading */
 495         if (!try_module_get(sdp->host->hostt->module))
 496                 sdp->host->hostt->module = NULL;
 497
 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         bool rescan_dev = false;
 780
 781         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 782                 const int len = strlen(sdev_states[i].name);
 783                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 784                    buf[len] == '\n') {
 785                         state = sdev_states[i].value;
 786                         break;
 787                 }
 788         }
 789         switch (state) {
 790         case SDEV_RUNNING:
 791         case SDEV_OFFLINE:
 792                 break;
 793         default:
 794                 return -EINVAL;
 795         }
 796
 797         mutex_lock(&sdev->state_mutex);
 798         if (sdev->sdev_state == SDEV_RUNNING && state == SDEV_RUNNING) {
 799                 ret = 0;
 800         } else {
 801                 ret = scsi_device_set_state(sdev, state);
 802                 if (ret == 0 && state == SDEV_RUNNING)
 803                         rescan_dev = true;
 804         }
 805         mutex_unlock(&sdev->state_mutex);
 806
 807         if (rescan_dev) {
 808                 /*
 809                  * If the device state changes to SDEV_RUNNING, we need to
 810                  * run the queue to avoid I/O hang, and rescan the device
 811                  * to revalidate it. Running the queue first is necessary
 812                  * because another thread may be waiting inside
 813                  * blk_mq_freeze_queue_wait() and because that call may be
 814                  * waiting for pending I/O to finish.
 815                  */
 816                 blk_mq_run_hw_queues(sdev->request_queue, true);
 817                 scsi_rescan_device(dev);
 818         }
 819
 820         return ret == 0 ? count : -EINVAL;
 821 }
 822
 823 static ssize_t
 824 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 825 {
 826         struct scsi_device *sdev = to_scsi_device(dev);
 827         const char *name = scsi_device_state_name(sdev->sdev_state);
 828
 829         if (!name)
 830                 return -EINVAL;
 831
 832         return snprintf(buf, 20, "%s\n", name);
 833 }
 834
 835 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 836
 837 static ssize_t
 838 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 839                       char *buf)
 840 {
 841         struct scsi_device *sdev = to_scsi_device(dev);
 842         const char *name = "none";
 843
 844         if (sdev->simple_tags)
 845                 name = "simple";
 846
 847         return snprintf(buf, 20, "%s\n", name);
 848 }
 849
 850 static ssize_t
 851 store_queue_type_field(struct device *dev, struct device_attribute *attr,
 852                        const char *buf, size_t count)
 853 {
 854         struct scsi_device *sdev = to_scsi_device(dev);
 855
 856         if (!sdev->tagged_supported)
 857                 return -EINVAL;
 858
 859         sdev_printk(KERN_INFO, sdev,
 860                     "ignoring write to deprecated queue_type attribute");
 861         return count;
 862 }
 863
 864 static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 865                    store_queue_type_field);
 866
 867 #define sdev_vpd_pg_attr(_page)                                         \
 868 static ssize_t                                                  \
 869 show_vpd_##_page(struct file *filp, struct kobject *kobj,       \
 870                  struct bin_attribute *bin_attr,                        \
 871                  char *buf, loff_t off, size_t count)                   \
 872 {                                                                       \
 873         struct device *dev = container_of(kobj, struct device, kobj);   \
 874         struct scsi_device *sdev = to_scsi_device(dev);                 \
 875         struct scsi_vpd *vpd_page;                                      \
 876         int ret = -EINVAL;                                              \
 877                                                                         \
 878         rcu_read_lock();                                                \
 879         vpd_page = rcu_dereference(sdev->vpd_##_page);                  \
 880         if (vpd_page)                                                   \
 881                 ret = memory_read_from_buffer(buf, count, &off,         \
 882                                 vpd_page->data, vpd_page->len);         \
 883         rcu_read_unlock();                                              \
 884         return ret;                                                     \
 885 }                                                                       \
 886 static struct bin_attribute dev_attr_vpd_##_page = {            \
 887         .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO },   \
 888         .size = 0,                                                      \
 889         .read = show_vpd_##_page,                                       \
 890 };
 891
 892 sdev_vpd_pg_attr(pg83);
 893 sdev_vpd_pg_attr(pg80);
 894
 895 static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
 896                             struct bin_attribute *bin_attr,
 897                             char *buf, loff_t off, size_t count)
 898 {
 899         struct device *dev = container_of(kobj, struct device, kobj);
 900         struct scsi_device *sdev = to_scsi_device(dev);
 901
 902         if (!sdev->inquiry)
 903                 return -EINVAL;
 904
 905         return memory_read_from_buffer(buf, count, &off, sdev->inquiry,
 906                                        sdev->inquiry_len);
 907 }
 908
 909 static struct bin_attribute dev_attr_inquiry = {
 910         .attr = {
 911                 .name = "inquiry",
 912                 .mode = S_IRUGO,
 913         },
 914         .size = 0,
 915         .read = show_inquiry,
 916 };
 917
 918 static ssize_t
 919 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
 920                         char *buf)
 921 {
 922         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 923 }
 924
 925 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 926
 927 #define show_sdev_iostat(field)                                         \
 928 static ssize_t                                                          \
 929 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 930                     char *buf)                                          \
 931 {                                                                       \
 932         struct scsi_device *sdev = to_scsi_device(dev);                 \
 933         unsigned long long count = atomic_read(&sdev->field);           \
 934         return snprintf(buf, 20, "0x%llx\n", count);                    \
 935 }                                                                       \
 936 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 937
 938 show_sdev_iostat(iorequest_cnt);
 939 show_sdev_iostat(iodone_cnt);
 940 show_sdev_iostat(ioerr_cnt);
 941
 942 static ssize_t
 943 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 944 {
 945         struct scsi_device *sdev;
 946         sdev = to_scsi_device(dev);
 947         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 948 }
 949 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 950
 951 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 952 static ssize_t                                                          \
 953 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 954                      char *buf)                                         \
 955 {                                                                       \
 956         struct scsi_device *sdev = to_scsi_device(dev);                 \
 957         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 958         return snprintf(buf, 20, "%d\n", val);                          \
 959 }
 960
 961 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 962 static ssize_t                                                          \
 963 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 964                       const char *buf, size_t count)                    \
 965 {                                                                       \
 966         struct scsi_device *sdev = to_scsi_device(dev);                 \
 967         int val = simple_strtoul(buf, NULL, 0);                         \
 968         if (val == 0)                                                   \
 969                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 970         else if (val == 1)                                              \
 971                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 972         else                                                            \
 973                 return -EINVAL;                                         \
 974         return count;                                                   \
 975 }
 976
 977 #define DECLARE_EVT(name, Cap_name)                                     \
 978         DECLARE_EVT_SHOW(name, Cap_name)                                \
 979         DECLARE_EVT_STORE(name, Cap_name)                               \
 980         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 981                            sdev_store_evt_##name);
 982 #define REF_EVT(name) &dev_attr_evt_##name.attr
 983
 984 DECLARE_EVT(media_change, MEDIA_CHANGE)
 985 DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
 986 DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
 987 DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
 988 DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
 989 DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
 990
 991 static ssize_t
 992 sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
 993                        const char *buf, size_t count)
 994 {
 995         int depth, retval;
 996         struct scsi_device *sdev = to_scsi_device(dev);
 997         struct scsi_host_template *sht = sdev->host->hostt;
 998
 999         if (!sht->change_queue_depth)
1000                 return -EINVAL;
1001
1002         depth = simple_strtoul(buf, NULL, 0);
1003
1004         if (depth < 1 || depth > sdev->host->can_queue)
1005                 return -EINVAL;
1006
1007         retval = sht->change_queue_depth(sdev, depth);
1008         if (retval < 0)
1009                 return retval;
1010
1011         sdev->max_queue_depth = sdev->queue_depth;
1012
1013         return count;
1014 }
1015 sdev_show_function(queue_depth, "%d\n");
1016
1017 static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
1018                    sdev_store_queue_depth);
1019
1020 static ssize_t
1021 sdev_show_wwid(struct device *dev, struct device_attribute *attr,
1022                     char *buf)
1023 {
1024         struct scsi_device *sdev = to_scsi_device(dev);
1025         ssize_t count;
1026
1027         count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
1028         if (count > 0) {
1029                 buf[count] = '\n';
1030                 count++;
1031         }
1032         return count;
1033 }
1034 static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
1035
1036 #define BLIST_FLAG_NAME(name)                                   \
1037         [const_ilog2((__force __u64)BLIST_##name)] = #name
1038 static const char *const sdev_bflags_name[] = {
1039 #include "scsi_devinfo_tbl.c"
1040 };
1041 #undef BLIST_FLAG_NAME
1042
1043 static ssize_t
1044 sdev_show_blacklist(struct device *dev, struct device_attribute *attr,
1045                     char *buf)
1046 {
1047         struct scsi_device *sdev = to_scsi_device(dev);
1048         int i;
1049         ssize_t len = 0;
1050
1051         for (i = 0; i < sizeof(sdev->sdev_bflags) * BITS_PER_BYTE; i++) {
1052                 const char *name = NULL;
1053
1054                 if (!(sdev->sdev_bflags & (__force blist_flags_t)BIT(i)))
1055                         continue;
1056                 if (i < ARRAY_SIZE(sdev_bflags_name) && sdev_bflags_name[i])
1057                         name = sdev_bflags_name[i];
1058
1059                 if (name)
1060                         len += snprintf(buf + len, PAGE_SIZE - len,
1061                                         "%s%s", len ? " " : "", name);
1062                 else
1063                         len += snprintf(buf + len, PAGE_SIZE - len,
1064                                         "%sINVALID_BIT(%d)", len ? " " : "", i);
1065         }
1066         if (len)
1067                 len += snprintf(buf + len, PAGE_SIZE - len, "\n");
1068         return len;
1069 }
1070 static DEVICE_ATTR(blacklist, S_IRUGO, sdev_show_blacklist, NULL);
1071
1072 #ifdef CONFIG_SCSI_DH
1073 static ssize_t
1074 sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
1075                    char *buf)
1076 {
1077         struct scsi_device *sdev = to_scsi_device(dev);
1078
1079         if (!sdev->handler)
1080                 return snprintf(buf, 20, "detached\n");
1081
1082         return snprintf(buf, 20, "%s\n", sdev->handler->name);
1083 }
1084
1085 static ssize_t
1086 sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
1087                     const char *buf, size_t count)
1088 {
1089         struct scsi_device *sdev = to_scsi_device(dev);
1090         int err = -EINVAL;
1091
1092         if (sdev->sdev_state == SDEV_CANCEL ||
1093             sdev->sdev_state == SDEV_DEL)
1094                 return -ENODEV;
1095
1096         if (!sdev->handler) {
1097                 /*
1098                  * Attach to a device handler
1099                  */
1100                 err = scsi_dh_attach(sdev->request_queue, buf);
1101         } else if (!strncmp(buf, "activate", 8)) {
1102                 /*
1103                  * Activate a device handler
1104                  */
1105                 if (sdev->handler->activate)
1106                         err = sdev->handler->activate(sdev, NULL, NULL);
1107                 else
1108                         err = 0;
1109         } else if (!strncmp(buf, "detach", 6)) {
1110                 /*
1111                  * Detach from a device handler
1112                  */
1113                 sdev_printk(KERN_WARNING, sdev,
1114                             "can't detach handler %s.\n",
1115                             sdev->handler->name);
1116                 err = -EINVAL;
1117         }
1118
1119         return err < 0 ? err : count;
1120 }
1121
1122 static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
1123                    sdev_store_dh_state);
1124
1125 static ssize_t
1126 sdev_show_access_state(struct device *dev,
1127                        struct device_attribute *attr,
1128                        char *buf)
1129 {
1130         struct scsi_device *sdev = to_scsi_device(dev);
1131         unsigned char access_state;
1132         const char *access_state_name;
1133
1134         if (!sdev->handler)
1135                 return -EINVAL;
1136
1137         access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK);
1138         access_state_name = scsi_access_state_name(access_state);
1139
1140         return sprintf(buf, "%s\n",
1141                        access_state_name ? access_state_name : "unknown");
1142 }
1143 static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL);
1144
1145 static ssize_t
1146 sdev_show_preferred_path(struct device *dev,
1147                          struct device_attribute *attr,
1148                          char *buf)
1149 {
1150         struct scsi_device *sdev = to_scsi_device(dev);
1151
1152         if (!sdev->handler)
1153                 return -EINVAL;
1154
1155         if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED)
1156                 return sprintf(buf, "1\n");
1157         else
1158                 return sprintf(buf, "0\n");
1159 }
1160 static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL);
1161 #endif
1162
1163 static ssize_t
1164 sdev_show_queue_ramp_up_period(struct device *dev,
1165                                struct device_attribute *attr,
1166                                char *buf)
1167 {
1168         struct scsi_device *sdev;
1169         sdev = to_scsi_device(dev);
1170         return snprintf(buf, 20, "%u\n",
1171                         jiffies_to_msecs(sdev->queue_ramp_up_period));
1172 }
1173
1174 static ssize_t
1175 sdev_store_queue_ramp_up_period(struct device *dev,
1176                                 struct device_attribute *attr,
1177                                 const char *buf, size_t count)
1178 {
1179         struct scsi_device *sdev = to_scsi_device(dev);
1180         unsigned int period;
1181
1182         if (kstrtouint(buf, 10, &period))
1183                 return -EINVAL;
1184
1185         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
1186         return count;
1187 }
1188
1189 static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
1190                    sdev_show_queue_ramp_up_period,
1191                    sdev_store_queue_ramp_up_period);
1192
1193 static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
1194                                          struct attribute *attr, int i)
1195 {
1196         struct device *dev = container_of(kobj, struct device, kobj);
1197         struct scsi_device *sdev = to_scsi_device(dev);
1198
1199
1200         if (attr == &dev_attr_queue_depth.attr &&
1201             !sdev->host->hostt->change_queue_depth)
1202                 return S_IRUGO;
1203
1204         if (attr == &dev_attr_queue_ramp_up_period.attr &&
1205             !sdev->host->hostt->change_queue_depth)
1206                 return 0;
1207
1208 #ifdef CONFIG_SCSI_DH
1209         if (attr == &dev_attr_access_state.attr &&
1210             !sdev->handler)
1211                 return 0;
1212         if (attr == &dev_attr_preferred_path.attr &&
1213             !sdev->handler)
1214                 return 0;
1215 #endif
1216         return attr->mode;
1217 }
1218
1219 static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
1220                                              struct bin_attribute *attr, int i)
1221 {
1222         struct device *dev = container_of(kobj, struct device, kobj);
1223         struct scsi_device *sdev = to_scsi_device(dev);
1224
1225
1226         if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80)
1227                 return 0;
1228
1229         if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83)
1230                 return 0;
1231
1232         return S_IRUGO;
1233 }
1234
1235 /* Default template for device attributes.  May NOT be modified */
1236 static struct attribute *scsi_sdev_attrs[] = {
1237         &dev_attr_device_blocked.attr,
1238         &dev_attr_type.attr,
1239         &dev_attr_scsi_level.attr,
1240         &dev_attr_device_busy.attr,
1241         &dev_attr_vendor.attr,
1242         &dev_attr_model.attr,
1243         &dev_attr_rev.attr,
1244         &dev_attr_rescan.attr,
1245         &dev_attr_delete.attr,
1246         &dev_attr_state.attr,
1247         &dev_attr_timeout.attr,
1248         &dev_attr_eh_timeout.attr,
1249         &dev_attr_iocounterbits.attr,
1250         &dev_attr_iorequest_cnt.attr,
1251         &dev_attr_iodone_cnt.attr,
1252         &dev_attr_ioerr_cnt.attr,
1253         &dev_attr_modalias.attr,
1254         &dev_attr_queue_depth.attr,
1255         &dev_attr_queue_type.attr,
1256         &dev_attr_wwid.attr,
1257         &dev_attr_blacklist.attr,
1258 #ifdef CONFIG_SCSI_DH
1259         &dev_attr_dh_state.attr,
1260         &dev_attr_access_state.attr,
1261         &dev_attr_preferred_path.attr,
1262 #endif
1263         &dev_attr_queue_ramp_up_period.attr,
1264         REF_EVT(media_change),
1265         REF_EVT(inquiry_change_reported),
1266         REF_EVT(capacity_change_reported),
1267         REF_EVT(soft_threshold_reached),
1268         REF_EVT(mode_parameter_change_reported),
1269         REF_EVT(lun_change_reported),
1270         NULL
1271 };
1272
1273 static struct bin_attribute *scsi_sdev_bin_attrs[] = {
1274         &dev_attr_vpd_pg83,
1275         &dev_attr_vpd_pg80,
1276         &dev_attr_inquiry,
1277         NULL
1278 };
1279 static struct attribute_group scsi_sdev_attr_group = {
1280         .attrs =        scsi_sdev_attrs,
1281         .bin_attrs =    scsi_sdev_bin_attrs,
1282         .is_visible =   scsi_sdev_attr_is_visible,
1283         .is_bin_visible = scsi_sdev_bin_attr_is_visible,
1284 };
1285
1286 static const struct attribute_group *scsi_sdev_attr_groups[] = {
1287         &scsi_sdev_attr_group,
1288         NULL
1289 };
1290
1291 static int scsi_target_add(struct scsi_target *starget)
1292 {
1293         int error;
1294
1295         if (starget->state != STARGET_CREATED)
1296                 return 0;
1297
1298         error = device_add(&starget->dev);
1299         if (error) {
1300                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
1301                 return error;
1302         }
1303         transport_add_device(&starget->dev);
1304         starget->state = STARGET_RUNNING;
1305
1306         pm_runtime_set_active(&starget->dev);
1307         pm_runtime_enable(&starget->dev);
1308         device_enable_async_suspend(&starget->dev);
1309
1310         return 0;
1311 }
1312
1313 /**
1314  * scsi_sysfs_add_sdev - add scsi device to sysfs
1315  * @sdev:       scsi_device to add
1316  *
1317  * Return value:
1318  *      0 on Success / non-zero on Failure
1319  **/
1320 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1321 {
1322         int error, i;
1323         struct request_queue *rq = sdev->request_queue;
1324         struct scsi_target *starget = sdev->sdev_target;
1325
1326         error = scsi_target_add(starget);
1327         if (error)
1328                 return error;
1329
1330         transport_configure_device(&starget->dev);
1331
1332         device_enable_async_suspend(&sdev->sdev_gendev);
1333         scsi_autopm_get_target(starget);
1334         pm_runtime_set_active(&sdev->sdev_gendev);
1335         pm_runtime_forbid(&sdev->sdev_gendev);
1336         pm_runtime_enable(&sdev->sdev_gendev);
1337         scsi_autopm_put_target(starget);
1338
1339         scsi_autopm_get_device(sdev);
1340
1341         scsi_dh_add_device(sdev);
1342
1343         error = device_add(&sdev->sdev_gendev);
1344         if (error) {
1345                 sdev_printk(KERN_INFO, sdev,
1346                                 "failed to add device: %d\n", error);
1347                 return error;
1348         }
1349
1350         device_enable_async_suspend(&sdev->sdev_dev);
1351         error = device_add(&sdev->sdev_dev);
1352         if (error) {
1353                 sdev_printk(KERN_INFO, sdev,
1354                                 "failed to add class device: %d\n", error);
1355                 device_del(&sdev->sdev_gendev);
1356                 return error;
1357         }
1358         transport_add_device(&sdev->sdev_gendev);
1359         sdev->is_visible = 1;
1360
1361         error = bsg_scsi_register_queue(rq, &sdev->sdev_gendev);
1362         if (error)
1363                 /* we're treating error on bsg register as non-fatal,
1364                  * so pretend nothing went wrong */
1365                 sdev_printk(KERN_INFO, sdev,
1366                             "Failed to register bsg queue, errno=%d\n", error);
1367
1368         /* add additional host specific attributes */
1369         if (sdev->host->hostt->sdev_attrs) {
1370                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
1371                         error = device_create_file(&sdev->sdev_gendev,
1372                                         sdev->host->hostt->sdev_attrs[i]);
1373                         if (error)
1374                                 return error;
1375                 }
1376         }
1377
1378         if (sdev->host->hostt->sdev_groups) {
1379                 error = sysfs_create_groups(&sdev->sdev_gendev.kobj,
1380                                 sdev->host->hostt->sdev_groups);
1381                 if (error)
1382                         return error;
1383         }
1384
1385         scsi_autopm_put_device(sdev);
1386         return error;
1387 }
1388
1389 void __scsi_remove_device(struct scsi_device *sdev)
1390 {
1391         struct device *dev = &sdev->sdev_gendev;
1392         int res;
1393
1394         /*
1395          * This cleanup path is not reentrant and while it is impossible
1396          * to get a new reference with scsi_device_get() someone can still
1397          * hold a previously acquired one.
1398          */
1399         if (sdev->sdev_state == SDEV_DEL)
1400                 return;
1401
1402         if (sdev->is_visible) {
1403                 /*
1404                  * If scsi_internal_target_block() is running concurrently,
1405                  * wait until it has finished before changing the device state.
1406                  */
1407                 mutex_lock(&sdev->state_mutex);
1408                 /*
1409                  * If blocked, we go straight to DEL and restart the queue so
1410                  * any commands issued during driver shutdown (like sync
1411                  * cache) are errored immediately.
1412                  */
1413                 res = scsi_device_set_state(sdev, SDEV_CANCEL);
1414                 if (res != 0) {
1415                         res = scsi_device_set_state(sdev, SDEV_DEL);
1416                         if (res == 0)
1417                                 scsi_start_queue(sdev);
1418                 }
1419                 mutex_unlock(&sdev->state_mutex);
1420
1421                 if (res != 0)
1422                         return;
1423
1424                 if (sdev->host->hostt->sdev_groups)
1425                         sysfs_remove_groups(&sdev->sdev_gendev.kobj,
1426                                         sdev->host->hostt->sdev_groups);
1427
1428                 bsg_unregister_queue(sdev->request_queue);
1429                 device_unregister(&sdev->sdev_dev);
1430                 transport_remove_device(dev);
1431                 device_del(dev);
1432         } else
1433                 put_device(&sdev->sdev_dev);
1434
1435         /*
1436          * Stop accepting new requests and wait until all queuecommand() and
1437          * scsi_run_queue() invocations have finished before tearing down the
1438          * device.
1439          */
1440         mutex_lock(&sdev->state_mutex);
1441         scsi_device_set_state(sdev, SDEV_DEL);
1442         mutex_unlock(&sdev->state_mutex);
1443
1444         blk_cleanup_queue(sdev->request_queue);
1445         cancel_work_sync(&sdev->requeue_work);
1446
1447         if (sdev->host->hostt->slave_destroy)
1448                 sdev->host->hostt->slave_destroy(sdev);
1449         transport_destroy_device(dev);
1450
1451         /*
1452          * Paired with the kref_get() in scsi_sysfs_initialize().  We have
1453          * remoed sysfs visibility from the device, so make the target
1454          * invisible if this was the last device underneath it.
1455          */
1456         scsi_target_reap(scsi_target(sdev));
1457
1458         put_device(dev);
1459 }
1460
1461 /**
1462  * scsi_remove_device - unregister a device from the scsi bus
1463  * @sdev:       scsi_device to unregister
1464  **/
1465 void scsi_remove_device(struct scsi_device *sdev)
1466 {
1467         struct Scsi_Host *shost = sdev->host;
1468
1469         mutex_lock(&shost->scan_mutex);
1470         __scsi_remove_device(sdev);
1471         mutex_unlock(&shost->scan_mutex);
1472 }
1473 EXPORT_SYMBOL(scsi_remove_device);
1474
1475 static void __scsi_remove_target(struct scsi_target *starget)
1476 {
1477         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1478         unsigned long flags;
1479         struct scsi_device *sdev;
1480
1481         spin_lock_irqsave(shost->host_lock, flags);
1482  restart:
1483         list_for_each_entry(sdev, &shost->__devices, siblings) {
1484                 /*
1485                  * We cannot call scsi_device_get() here, as
1486                  * we might've been called from rmmod() causing
1487                  * scsi_device_get() to fail the module_is_live()
1488                  * check.
1489                  */
1490                 if (sdev->channel != starget->channel ||
1491                     sdev->id != starget->id)
1492                         continue;
1493                 if (sdev->sdev_state == SDEV_DEL ||
1494                     sdev->sdev_state == SDEV_CANCEL ||
1495                     !get_device(&sdev->sdev_gendev))
1496                         continue;
1497                 spin_unlock_irqrestore(shost->host_lock, flags);
1498                 scsi_remove_device(sdev);
1499                 put_device(&sdev->sdev_gendev);
1500                 spin_lock_irqsave(shost->host_lock, flags);
1501                 goto restart;
1502         }
1503         spin_unlock_irqrestore(shost->host_lock, flags);
1504 }
1505
1506 /**
1507  * scsi_remove_target - try to remove a target and all its devices
1508  * @dev: generic starget or parent of generic stargets to be removed
1509  *
1510  * Note: This is slightly racy.  It is possible that if the user
1511  * requests the addition of another device then the target won't be
1512  * removed.
1513  */
1514 void scsi_remove_target(struct device *dev)
1515 {
1516         struct Scsi_Host *shost = dev_to_shost(dev->parent);
1517         struct scsi_target *starget;
1518         unsigned long flags;
1519
1520 restart:
1521         spin_lock_irqsave(shost->host_lock, flags);
1522         list_for_each_entry(starget, &shost->__targets, siblings) {
1523                 if (starget->state == STARGET_DEL ||
1524                     starget->state == STARGET_REMOVE ||
1525                     starget->state == STARGET_CREATED_REMOVE)
1526                         continue;
1527                 if (starget->dev.parent == dev || &starget->dev == dev) {
1528                         kref_get(&starget->reap_ref);
1529                         if (starget->state == STARGET_CREATED)
1530                                 starget->state = STARGET_CREATED_REMOVE;
1531                         else
1532                                 starget->state = STARGET_REMOVE;
1533                         spin_unlock_irqrestore(shost->host_lock, flags);
1534                         __scsi_remove_target(starget);
1535                         scsi_target_reap(starget);
1536                         goto restart;
1537                 }
1538         }
1539         spin_unlock_irqrestore(shost->host_lock, flags);
1540 }
1541 EXPORT_SYMBOL(scsi_remove_target);
1542
1543 int scsi_register_driver(struct device_driver *drv)
1544 {
1545         drv->bus = &scsi_bus_type;
1546
1547         return driver_register(drv);
1548 }
1549 EXPORT_SYMBOL(scsi_register_driver);
1550
1551 int scsi_register_interface(struct class_interface *intf)
1552 {
1553         intf->class = &sdev_class;
1554
1555         return class_interface_register(intf);
1556 }
1557 EXPORT_SYMBOL(scsi_register_interface);
1558
1559 /**
1560  * scsi_sysfs_add_host - add scsi host to subsystem
1561  * @shost:     scsi host struct to add to subsystem
1562  **/
1563 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1564 {
1565         int error, i;
1566
1567         /* add host specific attributes */
1568         if (shost->hostt->shost_attrs) {
1569                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1570                         error = device_create_file(&shost->shost_dev,
1571                                         shost->hostt->shost_attrs[i]);
1572                         if (error)
1573                                 return error;
1574                 }
1575         }
1576
1577         transport_register_device(&shost->shost_gendev);
1578         transport_configure_device(&shost->shost_gendev);
1579         return 0;
1580 }
1581
1582 static struct device_type scsi_dev_type = {
1583         .name =         "scsi_device",
1584         .release =      scsi_device_dev_release,
1585         .groups =       scsi_sdev_attr_groups,
1586 };
1587
1588 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1589 {
1590         unsigned long flags;
1591         struct Scsi_Host *shost = sdev->host;
1592         struct scsi_target  *starget = sdev->sdev_target;
1593
1594         device_initialize(&sdev->sdev_gendev);
1595         sdev->sdev_gendev.bus = &scsi_bus_type;
1596         sdev->sdev_gendev.type = &scsi_dev_type;
1597         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu",
1598                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1599
1600         device_initialize(&sdev->sdev_dev);
1601         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1602         sdev->sdev_dev.class = &sdev_class;
1603         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu",
1604                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1605         /*
1606          * Get a default scsi_level from the target (derived from sibling
1607          * devices).  This is the best we can do for guessing how to set
1608          * sdev->lun_in_cdb for the initial INQUIRY command.  For LUN 0 the
1609          * setting doesn't matter, because all the bits are zero anyway.
1610          * But it does matter for higher LUNs.
1611          */
1612         sdev->scsi_level = starget->scsi_level;
1613         if (sdev->scsi_level <= SCSI_2 &&
1614                         sdev->scsi_level != SCSI_UNKNOWN &&
1615                         !shost->no_scsi2_lun_in_cdb)
1616                 sdev->lun_in_cdb = 1;
1617
1618         transport_setup_device(&sdev->sdev_gendev);
1619         spin_lock_irqsave(shost->host_lock, flags);
1620         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1621         list_add_tail(&sdev->siblings, &shost->__devices);
1622         spin_unlock_irqrestore(shost->host_lock, flags);
1623         /*
1624          * device can now only be removed via __scsi_remove_device() so hold
1625          * the target.  Target will be held in CREATED state until something
1626          * beneath it becomes visible (in which case it moves to RUNNING)
1627          */
1628         kref_get(&starget->reap_ref);
1629 }
1630
1631 int scsi_is_sdev_device(const struct device *dev)
1632 {
1633         return dev->type == &scsi_dev_type;
1634 }
1635 EXPORT_SYMBOL(scsi_is_sdev_device);
1636
1637 /* A blank transport template that is used in drivers that don't
1638  * yet implement Transport Attributes */
1639 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };