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         rcu_swap_protected(sdev->vpd_pg0, vpd_pg0,
 471                            lockdep_is_held(&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         rcu_swap_protected(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
 743         kn = sysfs_break_active_protection(&dev->kobj, &attr->attr);
 744         WARN_ON_ONCE(!kn);
 745         /*
 746          * Concurrent writes into the "delete" sysfs attribute may trigger
 747          * concurrent calls to device_remove_file() and scsi_remove_device().
 748          * device_remove_file() handles concurrent removal calls by
 749          * serializing these and by ignoring the second and later removal
 750          * attempts.  Concurrent calls of scsi_remove_device() are
 751          * serialized. The second and later calls of scsi_remove_device() are
 752          * ignored because the first call of that function changes the device
 753          * state into SDEV_DEL.
 754          */
 755         device_remove_file(dev, attr);
 756         scsi_remove_device(to_scsi_device(dev));
 757         if (kn)
 758                 sysfs_unbreak_active_protection(kn);
 759         return count;
 760 };
 761 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 762
 763 static ssize_t
 764 store_state_field(struct device *dev, struct device_attribute *attr,
 765                   const char *buf, size_t count)
 766 {
 767         int i, ret;
 768         struct scsi_device *sdev = to_scsi_device(dev);
 769         enum scsi_device_state state = 0;
 770
 771         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 772                 const int len = strlen(sdev_states[i].name);
 773                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 774                    buf[len] == '\n') {
 775                         state = sdev_states[i].value;
 776                         break;
 777                 }
 778         }
 779         switch (state) {
 780         case SDEV_RUNNING:
 781         case SDEV_OFFLINE:
 782                 break;
 783         default:
 784                 return -EINVAL;
 785         }
 786
 787         mutex_lock(&sdev->state_mutex);
 788         ret = scsi_device_set_state(sdev, state);
 789         /*
 790          * If the device state changes to SDEV_RUNNING, we need to run
 791          * the queue to avoid I/O hang.
 792          */
 793         if (ret == 0 && state == SDEV_RUNNING)
 794                 blk_mq_run_hw_queues(sdev->request_queue, true);
 795         mutex_unlock(&sdev->state_mutex);
 796
 797         return ret == 0 ? count : -EINVAL;
 798 }
 799
 800 static ssize_t
 801 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 802 {
 803         struct scsi_device *sdev = to_scsi_device(dev);
 804         const char *name = scsi_device_state_name(sdev->sdev_state);
 805
 806         if (!name)
 807                 return -EINVAL;
 808
 809         return snprintf(buf, 20, "%s\n", name);
 810 }
 811
 812 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 813
 814 static ssize_t
 815 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 816                       char *buf)
 817 {
 818         struct scsi_device *sdev = to_scsi_device(dev);
 819         const char *name = "none";
 820
 821         if (sdev->simple_tags)
 822                 name = "simple";
 823
 824         return snprintf(buf, 20, "%s\n", name);
 825 }
 826
 827 static ssize_t
 828 store_queue_type_field(struct device *dev, struct device_attribute *attr,
 829                        const char *buf, size_t count)
 830 {
 831         struct scsi_device *sdev = to_scsi_device(dev);
 832
 833         if (!sdev->tagged_supported)
 834                 return -EINVAL;
 835
 836         sdev_printk(KERN_INFO, sdev,
 837                     "ignoring write to deprecated queue_type attribute");
 838         return count;
 839 }
 840
 841 static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 842                    store_queue_type_field);
 843
 844 #define sdev_vpd_pg_attr(_page)                                         \
 845 static ssize_t                                                  \
 846 show_vpd_##_page(struct file *filp, struct kobject *kobj,       \
 847                  struct bin_attribute *bin_attr,                        \
 848                  char *buf, loff_t off, size_t count)                   \
 849 {                                                                       \
 850         struct device *dev = container_of(kobj, struct device, kobj);   \
 851         struct scsi_device *sdev = to_scsi_device(dev);                 \
 852         struct scsi_vpd *vpd_page;                                      \
 853         int ret = -EINVAL;                                              \
 854                                                                         \
 855         rcu_read_lock();                                                \
 856         vpd_page = rcu_dereference(sdev->vpd_##_page);                  \
 857         if (vpd_page)                                                   \
 858                 ret = memory_read_from_buffer(buf, count, &off,         \
 859                                 vpd_page->data, vpd_page->len);         \
 860         rcu_read_unlock();                                              \
 861         return ret;                                                     \
 862 }                                                                       \
 863 static struct bin_attribute dev_attr_vpd_##_page = {            \
 864         .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO },   \
 865         .size = 0,                                                      \
 866         .read = show_vpd_##_page,                                       \
 867 };
 868
 869 sdev_vpd_pg_attr(pg83);
 870 sdev_vpd_pg_attr(pg80);
 871 sdev_vpd_pg_attr(pg89);
 872 sdev_vpd_pg_attr(pg0);
 873
 874 static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
 875                             struct bin_attribute *bin_attr,
 876                             char *buf, loff_t off, size_t count)
 877 {
 878         struct device *dev = container_of(kobj, struct device, kobj);
 879         struct scsi_device *sdev = to_scsi_device(dev);
 880
 881         if (!sdev->inquiry)
 882                 return -EINVAL;
 883
 884         return memory_read_from_buffer(buf, count, &off, sdev->inquiry,
 885                                        sdev->inquiry_len);
 886 }
 887
 888 static struct bin_attribute dev_attr_inquiry = {
 889         .attr = {
 890                 .name = "inquiry",
 891                 .mode = S_IRUGO,
 892         },
 893         .size = 0,
 894         .read = show_inquiry,
 895 };
 896
 897 static ssize_t
 898 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
 899                         char *buf)
 900 {
 901         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 902 }
 903
 904 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 905
 906 #define show_sdev_iostat(field)                                         \
 907 static ssize_t                                                          \
 908 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 909                     char *buf)                                          \
 910 {                                                                       \
 911         struct scsi_device *sdev = to_scsi_device(dev);                 \
 912         unsigned long long count = atomic_read(&sdev->field);           \
 913         return snprintf(buf, 20, "0x%llx\n", count);                    \
 914 }                                                                       \
 915 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 916
 917 show_sdev_iostat(iorequest_cnt);
 918 show_sdev_iostat(iodone_cnt);
 919 show_sdev_iostat(ioerr_cnt);
 920
 921 static ssize_t
 922 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 923 {
 924         struct scsi_device *sdev;
 925         sdev = to_scsi_device(dev);
 926         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 927 }
 928 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 929
 930 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 931 static ssize_t                                                          \
 932 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 933                      char *buf)                                         \
 934 {                                                                       \
 935         struct scsi_device *sdev = to_scsi_device(dev);                 \
 936         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 937         return snprintf(buf, 20, "%d\n", val);                          \
 938 }
 939
 940 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 941 static ssize_t                                                          \
 942 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 943                       const char *buf, size_t count)                    \
 944 {                                                                       \
 945         struct scsi_device *sdev = to_scsi_device(dev);                 \
 946         int val = simple_strtoul(buf, NULL, 0);                         \
 947         if (val == 0)                                                   \
 948                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 949         else if (val == 1)                                              \
 950                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 951         else                                                            \
 952                 return -EINVAL;                                         \
 953         return count;                                                   \
 954 }
 955
 956 #define DECLARE_EVT(name, Cap_name)                                     \
 957         DECLARE_EVT_SHOW(name, Cap_name)                                \
 958         DECLARE_EVT_STORE(name, Cap_name)                               \
 959         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 960                            sdev_store_evt_##name);
 961 #define REF_EVT(name) &dev_attr_evt_##name.attr
 962
 963 DECLARE_EVT(media_change, MEDIA_CHANGE)
 964 DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
 965 DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
 966 DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
 967 DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
 968 DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
 969
 970 static ssize_t
 971 sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
 972                        const char *buf, size_t count)
 973 {
 974         int depth, retval;
 975         struct scsi_device *sdev = to_scsi_device(dev);
 976         struct scsi_host_template *sht = sdev->host->hostt;
 977
 978         if (!sht->change_queue_depth)
 979                 return -EINVAL;
 980
 981         depth = simple_strtoul(buf, NULL, 0);
 982
 983         if (depth < 1 || depth > sdev->host->can_queue)
 984                 return -EINVAL;
 985
 986         retval = sht->change_queue_depth(sdev, depth);
 987         if (retval < 0)
 988                 return retval;
 989
 990         sdev->max_queue_depth = sdev->queue_depth;
 991
 992         return count;
 993 }
 994 sdev_show_function(queue_depth, "%d\n");
 995
 996 static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 997                    sdev_store_queue_depth);
 998
 999 static ssize_t
1000 sdev_show_wwid(struct device *dev, struct device_attribute *attr,
1001                     char *buf)
1002 {
1003         struct scsi_device *sdev = to_scsi_device(dev);
1004         ssize_t count;
1005
1006         count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
1007         if (count > 0) {
1008                 buf[count] = '\n';
1009                 count++;
1010         }
1011         return count;
1012 }
1013 static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
1014
1015 #define BLIST_FLAG_NAME(name)                                   \
1016         [const_ilog2((__force __u64)BLIST_##name)] = #name
1017 static const char *const sdev_bflags_name[] = {
1018 #include "scsi_devinfo_tbl.c"
1019 };
1020 #undef BLIST_FLAG_NAME
1021
1022 static ssize_t
1023 sdev_show_blacklist(struct device *dev, struct device_attribute *attr,
1024                     char *buf)
1025 {
1026         struct scsi_device *sdev = to_scsi_device(dev);
1027         int i;
1028         ssize_t len = 0;
1029
1030         for (i = 0; i < sizeof(sdev->sdev_bflags) * BITS_PER_BYTE; i++) {
1031                 const char *name = NULL;
1032
1033                 if (!(sdev->sdev_bflags & (__force blist_flags_t)BIT(i)))
1034                         continue;
1035                 if (i < ARRAY_SIZE(sdev_bflags_name) && sdev_bflags_name[i])
1036                         name = sdev_bflags_name[i];
1037
1038                 if (name)
1039                         len += snprintf(buf + len, PAGE_SIZE - len,
1040                                         "%s%s", len ? " " : "", name);
1041                 else
1042                         len += snprintf(buf + len, PAGE_SIZE - len,
1043                                         "%sINVALID_BIT(%d)", len ? " " : "", i);
1044         }
1045         if (len)
1046                 len += snprintf(buf + len, PAGE_SIZE - len, "\n");
1047         return len;
1048 }
1049 static DEVICE_ATTR(blacklist, S_IRUGO, sdev_show_blacklist, NULL);
1050
1051 #ifdef CONFIG_SCSI_DH
1052 static ssize_t
1053 sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
1054                    char *buf)
1055 {
1056         struct scsi_device *sdev = to_scsi_device(dev);
1057
1058         if (!sdev->handler)
1059                 return snprintf(buf, 20, "detached\n");
1060
1061         return snprintf(buf, 20, "%s\n", sdev->handler->name);
1062 }
1063
1064 static ssize_t
1065 sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
1066                     const char *buf, size_t count)
1067 {
1068         struct scsi_device *sdev = to_scsi_device(dev);
1069         int err = -EINVAL;
1070
1071         if (sdev->sdev_state == SDEV_CANCEL ||
1072             sdev->sdev_state == SDEV_DEL)
1073                 return -ENODEV;
1074
1075         if (!sdev->handler) {
1076                 /*
1077                  * Attach to a device handler
1078                  */
1079                 err = scsi_dh_attach(sdev->request_queue, buf);
1080         } else if (!strncmp(buf, "activate", 8)) {
1081                 /*
1082                  * Activate a device handler
1083                  */
1084                 if (sdev->handler->activate)
1085                         err = sdev->handler->activate(sdev, NULL, NULL);
1086                 else
1087                         err = 0;
1088         } else if (!strncmp(buf, "detach", 6)) {
1089                 /*
1090                  * Detach from a device handler
1091                  */
1092                 sdev_printk(KERN_WARNING, sdev,
1093                             "can't detach handler %s.\n",
1094                             sdev->handler->name);
1095                 err = -EINVAL;
1096         }
1097
1098         return err < 0 ? err : count;
1099 }
1100
1101 static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
1102                    sdev_store_dh_state);
1103
1104 static ssize_t
1105 sdev_show_access_state(struct device *dev,
1106                        struct device_attribute *attr,
1107                        char *buf)
1108 {
1109         struct scsi_device *sdev = to_scsi_device(dev);
1110         unsigned char access_state;
1111         const char *access_state_name;
1112
1113         if (!sdev->handler)
1114                 return -EINVAL;
1115
1116         access_state = (sdev->access_state & SCSI_ACCESS_STATE_MASK);
1117         access_state_name = scsi_access_state_name(access_state);
1118
1119         return sprintf(buf, "%s\n",
1120                        access_state_name ? access_state_name : "unknown");
1121 }
1122 static DEVICE_ATTR(access_state, S_IRUGO, sdev_show_access_state, NULL);
1123
1124 static ssize_t
1125 sdev_show_preferred_path(struct device *dev,
1126                          struct device_attribute *attr,
1127                          char *buf)
1128 {
1129         struct scsi_device *sdev = to_scsi_device(dev);
1130
1131         if (!sdev->handler)
1132                 return -EINVAL;
1133
1134         if (sdev->access_state & SCSI_ACCESS_STATE_PREFERRED)
1135                 return sprintf(buf, "1\n");
1136         else
1137                 return sprintf(buf, "0\n");
1138 }
1139 static DEVICE_ATTR(preferred_path, S_IRUGO, sdev_show_preferred_path, NULL);
1140 #endif
1141
1142 static ssize_t
1143 sdev_show_queue_ramp_up_period(struct device *dev,
1144                                struct device_attribute *attr,
1145                                char *buf)
1146 {
1147         struct scsi_device *sdev;
1148         sdev = to_scsi_device(dev);
1149         return snprintf(buf, 20, "%u\n",
1150                         jiffies_to_msecs(sdev->queue_ramp_up_period));
1151 }
1152
1153 static ssize_t
1154 sdev_store_queue_ramp_up_period(struct device *dev,
1155                                 struct device_attribute *attr,
1156                                 const char *buf, size_t count)
1157 {
1158         struct scsi_device *sdev = to_scsi_device(dev);
1159         unsigned int period;
1160
1161         if (kstrtouint(buf, 10, &period))
1162                 return -EINVAL;
1163
1164         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
1165         return count;
1166 }
1167
1168 static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
1169                    sdev_show_queue_ramp_up_period,
1170                    sdev_store_queue_ramp_up_period);
1171
1172 static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
1173                                          struct attribute *attr, int i)
1174 {
1175         struct device *dev = container_of(kobj, struct device, kobj);
1176         struct scsi_device *sdev = to_scsi_device(dev);
1177
1178
1179         if (attr == &dev_attr_queue_depth.attr &&
1180             !sdev->host->hostt->change_queue_depth)
1181                 return S_IRUGO;
1182
1183         if (attr == &dev_attr_queue_ramp_up_period.attr &&
1184             !sdev->host->hostt->change_queue_depth)
1185                 return 0;
1186
1187 #ifdef CONFIG_SCSI_DH
1188         if (attr == &dev_attr_access_state.attr &&
1189             !sdev->handler)
1190                 return 0;
1191         if (attr == &dev_attr_preferred_path.attr &&
1192             !sdev->handler)
1193                 return 0;
1194 #endif
1195         return attr->mode;
1196 }
1197
1198 static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
1199                                              struct bin_attribute *attr, int i)
1200 {
1201         struct device *dev = container_of(kobj, struct device, kobj);
1202         struct scsi_device *sdev = to_scsi_device(dev);
1203
1204
1205         if (attr == &dev_attr_vpd_pg0 && !sdev->vpd_pg0)
1206                 return 0;
1207
1208         if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80)
1209                 return 0;
1210
1211         if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83)
1212                 return 0;
1213
1214         if (attr == &dev_attr_vpd_pg89 && !sdev->vpd_pg89)
1215                 return 0;
1216
1217         return S_IRUGO;
1218 }
1219
1220 /* Default template for device attributes.  May NOT be modified */
1221 static struct attribute *scsi_sdev_attrs[] = {
1222         &dev_attr_device_blocked.attr,
1223         &dev_attr_type.attr,
1224         &dev_attr_scsi_level.attr,
1225         &dev_attr_device_busy.attr,
1226         &dev_attr_vendor.attr,
1227         &dev_attr_model.attr,
1228         &dev_attr_rev.attr,
1229         &dev_attr_rescan.attr,
1230         &dev_attr_delete.attr,
1231         &dev_attr_state.attr,
1232         &dev_attr_timeout.attr,
1233         &dev_attr_eh_timeout.attr,
1234         &dev_attr_iocounterbits.attr,
1235         &dev_attr_iorequest_cnt.attr,
1236         &dev_attr_iodone_cnt.attr,
1237         &dev_attr_ioerr_cnt.attr,
1238         &dev_attr_modalias.attr,
1239         &dev_attr_queue_depth.attr,
1240         &dev_attr_queue_type.attr,
1241         &dev_attr_wwid.attr,
1242         &dev_attr_blacklist.attr,
1243 #ifdef CONFIG_SCSI_DH
1244         &dev_attr_dh_state.attr,
1245         &dev_attr_access_state.attr,
1246         &dev_attr_preferred_path.attr,
1247 #endif
1248         &dev_attr_queue_ramp_up_period.attr,
1249         REF_EVT(media_change),
1250         REF_EVT(inquiry_change_reported),
1251         REF_EVT(capacity_change_reported),
1252         REF_EVT(soft_threshold_reached),
1253         REF_EVT(mode_parameter_change_reported),
1254         REF_EVT(lun_change_reported),
1255         NULL
1256 };
1257
1258 static struct bin_attribute *scsi_sdev_bin_attrs[] = {
1259         &dev_attr_vpd_pg0,
1260         &dev_attr_vpd_pg83,
1261         &dev_attr_vpd_pg80,
1262         &dev_attr_vpd_pg89,
1263         &dev_attr_inquiry,
1264         NULL
1265 };
1266 static struct attribute_group scsi_sdev_attr_group = {
1267         .attrs =        scsi_sdev_attrs,
1268         .bin_attrs =    scsi_sdev_bin_attrs,
1269         .is_visible =   scsi_sdev_attr_is_visible,
1270         .is_bin_visible = scsi_sdev_bin_attr_is_visible,
1271 };
1272
1273 static const struct attribute_group *scsi_sdev_attr_groups[] = {
1274         &scsi_sdev_attr_group,
1275         NULL
1276 };
1277
1278 static int scsi_target_add(struct scsi_target *starget)
1279 {
1280         int error;
1281
1282         if (starget->state != STARGET_CREATED)
1283                 return 0;
1284
1285         error = device_add(&starget->dev);
1286         if (error) {
1287                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
1288                 return error;
1289         }
1290         transport_add_device(&starget->dev);
1291         starget->state = STARGET_RUNNING;
1292
1293         pm_runtime_set_active(&starget->dev);
1294         pm_runtime_enable(&starget->dev);
1295         device_enable_async_suspend(&starget->dev);
1296
1297         return 0;
1298 }
1299
1300 /**
1301  * scsi_sysfs_add_sdev - add scsi device to sysfs
1302  * @sdev:       scsi_device to add
1303  *
1304  * Return value:
1305  *      0 on Success / non-zero on Failure
1306  **/
1307 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1308 {
1309         int error, i;
1310         struct request_queue *rq = sdev->request_queue;
1311         struct scsi_target *starget = sdev->sdev_target;
1312
1313         error = scsi_target_add(starget);
1314         if (error)
1315                 return error;
1316
1317         transport_configure_device(&starget->dev);
1318
1319         device_enable_async_suspend(&sdev->sdev_gendev);
1320         scsi_autopm_get_target(starget);
1321         pm_runtime_set_active(&sdev->sdev_gendev);
1322         if (!sdev->rpm_autosuspend)
1323                 pm_runtime_forbid(&sdev->sdev_gendev);
1324         pm_runtime_enable(&sdev->sdev_gendev);
1325         scsi_autopm_put_target(starget);
1326
1327         scsi_autopm_get_device(sdev);
1328
1329         scsi_dh_add_device(sdev);
1330
1331         error = device_add(&sdev->sdev_gendev);
1332         if (error) {
1333                 sdev_printk(KERN_INFO, sdev,
1334                                 "failed to add device: %d\n", error);
1335                 return error;
1336         }
1337
1338         device_enable_async_suspend(&sdev->sdev_dev);
1339         error = device_add(&sdev->sdev_dev);
1340         if (error) {
1341                 sdev_printk(KERN_INFO, sdev,
1342                                 "failed to add class device: %d\n", error);
1343                 device_del(&sdev->sdev_gendev);
1344                 return error;
1345         }
1346         transport_add_device(&sdev->sdev_gendev);
1347         sdev->is_visible = 1;
1348
1349         error = bsg_scsi_register_queue(rq, &sdev->sdev_gendev);
1350         if (error)
1351                 /* we're treating error on bsg register as non-fatal,
1352                  * so pretend nothing went wrong */
1353                 sdev_printk(KERN_INFO, sdev,
1354                             "Failed to register bsg queue, errno=%d\n", error);
1355
1356         /* add additional host specific attributes */
1357         if (sdev->host->hostt->sdev_attrs) {
1358                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
1359                         error = device_create_file(&sdev->sdev_gendev,
1360                                         sdev->host->hostt->sdev_attrs[i]);
1361                         if (error)
1362                                 return error;
1363                 }
1364         }
1365
1366         if (sdev->host->hostt->sdev_groups) {
1367                 error = sysfs_create_groups(&sdev->sdev_gendev.kobj,
1368                                 sdev->host->hostt->sdev_groups);
1369                 if (error)
1370                         return error;
1371         }
1372
1373         scsi_autopm_put_device(sdev);
1374         return error;
1375 }
1376
1377 void __scsi_remove_device(struct scsi_device *sdev)
1378 {
1379         struct device *dev = &sdev->sdev_gendev;
1380         int res;
1381
1382         /*
1383          * This cleanup path is not reentrant and while it is impossible
1384          * to get a new reference with scsi_device_get() someone can still
1385          * hold a previously acquired one.
1386          */
1387         if (sdev->sdev_state == SDEV_DEL)
1388                 return;
1389
1390         if (sdev->is_visible) {
1391                 /*
1392                  * If scsi_internal_target_block() is running concurrently,
1393                  * wait until it has finished before changing the device state.
1394                  */
1395                 mutex_lock(&sdev->state_mutex);
1396                 /*
1397                  * If blocked, we go straight to DEL and restart the queue so
1398                  * any commands issued during driver shutdown (like sync
1399                  * cache) are errored immediately.
1400                  */
1401                 res = scsi_device_set_state(sdev, SDEV_CANCEL);
1402                 if (res != 0) {
1403                         res = scsi_device_set_state(sdev, SDEV_DEL);
1404                         if (res == 0)
1405                                 scsi_start_queue(sdev);
1406                 }
1407                 mutex_unlock(&sdev->state_mutex);
1408
1409                 if (res != 0)
1410                         return;
1411
1412                 if (sdev->host->hostt->sdev_groups)
1413                         sysfs_remove_groups(&sdev->sdev_gendev.kobj,
1414                                         sdev->host->hostt->sdev_groups);
1415
1416                 bsg_unregister_queue(sdev->request_queue);
1417                 device_unregister(&sdev->sdev_dev);
1418                 transport_remove_device(dev);
1419                 device_del(dev);
1420         } else
1421                 put_device(&sdev->sdev_dev);
1422
1423         /*
1424          * Stop accepting new requests and wait until all queuecommand() and
1425          * scsi_run_queue() invocations have finished before tearing down the
1426          * device.
1427          */
1428         mutex_lock(&sdev->state_mutex);
1429         scsi_device_set_state(sdev, SDEV_DEL);
1430         mutex_unlock(&sdev->state_mutex);
1431
1432         blk_cleanup_queue(sdev->request_queue);
1433         cancel_work_sync(&sdev->requeue_work);
1434
1435         if (sdev->host->hostt->slave_destroy)
1436                 sdev->host->hostt->slave_destroy(sdev);
1437         transport_destroy_device(dev);
1438
1439         /*
1440          * Paired with the kref_get() in scsi_sysfs_initialize().  We have
1441          * remoed sysfs visibility from the device, so make the target
1442          * invisible if this was the last device underneath it.
1443          */
1444         scsi_target_reap(scsi_target(sdev));
1445
1446         put_device(dev);
1447 }
1448
1449 /**
1450  * scsi_remove_device - unregister a device from the scsi bus
1451  * @sdev:       scsi_device to unregister
1452  **/
1453 void scsi_remove_device(struct scsi_device *sdev)
1454 {
1455         struct Scsi_Host *shost = sdev->host;
1456
1457         mutex_lock(&shost->scan_mutex);
1458         __scsi_remove_device(sdev);
1459         mutex_unlock(&shost->scan_mutex);
1460 }
1461 EXPORT_SYMBOL(scsi_remove_device);
1462
1463 static void __scsi_remove_target(struct scsi_target *starget)
1464 {
1465         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1466         unsigned long flags;
1467         struct scsi_device *sdev;
1468
1469         spin_lock_irqsave(shost->host_lock, flags);
1470  restart:
1471         list_for_each_entry(sdev, &shost->__devices, siblings) {
1472                 /*
1473                  * We cannot call scsi_device_get() here, as
1474                  * we might've been called from rmmod() causing
1475                  * scsi_device_get() to fail the module_is_live()
1476                  * check.
1477                  */
1478                 if (sdev->channel != starget->channel ||
1479                     sdev->id != starget->id)
1480                         continue;
1481                 if (sdev->sdev_state == SDEV_DEL ||
1482                     sdev->sdev_state == SDEV_CANCEL ||
1483                     !get_device(&sdev->sdev_gendev))
1484                         continue;
1485                 spin_unlock_irqrestore(shost->host_lock, flags);
1486                 scsi_remove_device(sdev);
1487                 put_device(&sdev->sdev_gendev);
1488                 spin_lock_irqsave(shost->host_lock, flags);
1489                 goto restart;
1490         }
1491         spin_unlock_irqrestore(shost->host_lock, flags);
1492 }
1493
1494 /**
1495  * scsi_remove_target - try to remove a target and all its devices
1496  * @dev: generic starget or parent of generic stargets to be removed
1497  *
1498  * Note: This is slightly racy.  It is possible that if the user
1499  * requests the addition of another device then the target won't be
1500  * removed.
1501  */
1502 void scsi_remove_target(struct device *dev)
1503 {
1504         struct Scsi_Host *shost = dev_to_shost(dev->parent);
1505         struct scsi_target *starget;
1506         unsigned long flags;
1507
1508 restart:
1509         spin_lock_irqsave(shost->host_lock, flags);
1510         list_for_each_entry(starget, &shost->__targets, siblings) {
1511                 if (starget->state == STARGET_DEL ||
1512                     starget->state == STARGET_REMOVE ||
1513                     starget->state == STARGET_CREATED_REMOVE)
1514                         continue;
1515                 if (starget->dev.parent == dev || &starget->dev == dev) {
1516                         kref_get(&starget->reap_ref);
1517                         if (starget->state == STARGET_CREATED)
1518                                 starget->state = STARGET_CREATED_REMOVE;
1519                         else
1520                                 starget->state = STARGET_REMOVE;
1521                         spin_unlock_irqrestore(shost->host_lock, flags);
1522                         __scsi_remove_target(starget);
1523                         scsi_target_reap(starget);
1524                         goto restart;
1525                 }
1526         }
1527         spin_unlock_irqrestore(shost->host_lock, flags);
1528 }
1529 EXPORT_SYMBOL(scsi_remove_target);
1530
1531 int scsi_register_driver(struct device_driver *drv)
1532 {
1533         drv->bus = &scsi_bus_type;
1534
1535         return driver_register(drv);
1536 }
1537 EXPORT_SYMBOL(scsi_register_driver);
1538
1539 int scsi_register_interface(struct class_interface *intf)
1540 {
1541         intf->class = &sdev_class;
1542
1543         return class_interface_register(intf);
1544 }
1545 EXPORT_SYMBOL(scsi_register_interface);
1546
1547 /**
1548  * scsi_sysfs_add_host - add scsi host to subsystem
1549  * @shost:     scsi host struct to add to subsystem
1550  **/
1551 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1552 {
1553         int error, i;
1554
1555         /* add host specific attributes */
1556         if (shost->hostt->shost_attrs) {
1557                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1558                         error = device_create_file(&shost->shost_dev,
1559                                         shost->hostt->shost_attrs[i]);
1560                         if (error)
1561                                 return error;
1562                 }
1563         }
1564
1565         transport_register_device(&shost->shost_gendev);
1566         transport_configure_device(&shost->shost_gendev);
1567         return 0;
1568 }
1569
1570 static struct device_type scsi_dev_type = {
1571         .name =         "scsi_device",
1572         .release =      scsi_device_dev_release,
1573         .groups =       scsi_sdev_attr_groups,
1574 };
1575
1576 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1577 {
1578         unsigned long flags;
1579         struct Scsi_Host *shost = sdev->host;
1580         struct scsi_target  *starget = sdev->sdev_target;
1581
1582         device_initialize(&sdev->sdev_gendev);
1583         sdev->sdev_gendev.bus = &scsi_bus_type;
1584         sdev->sdev_gendev.type = &scsi_dev_type;
1585         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu",
1586                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1587
1588         device_initialize(&sdev->sdev_dev);
1589         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1590         sdev->sdev_dev.class = &sdev_class;
1591         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu",
1592                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1593         /*
1594          * Get a default scsi_level from the target (derived from sibling
1595          * devices).  This is the best we can do for guessing how to set
1596          * sdev->lun_in_cdb for the initial INQUIRY command.  For LUN 0 the
1597          * setting doesn't matter, because all the bits are zero anyway.
1598          * But it does matter for higher LUNs.
1599          */
1600         sdev->scsi_level = starget->scsi_level;
1601         if (sdev->scsi_level <= SCSI_2 &&
1602                         sdev->scsi_level != SCSI_UNKNOWN &&
1603                         !shost->no_scsi2_lun_in_cdb)
1604                 sdev->lun_in_cdb = 1;
1605
1606         transport_setup_device(&sdev->sdev_gendev);
1607         spin_lock_irqsave(shost->host_lock, flags);
1608         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1609         list_add_tail(&sdev->siblings, &shost->__devices);
1610         spin_unlock_irqrestore(shost->host_lock, flags);
1611         /*
1612          * device can now only be removed via __scsi_remove_device() so hold
1613          * the target.  Target will be held in CREATED state until something
1614          * beneath it becomes visible (in which case it moves to RUNNING)
1615          */
1616         kref_get(&starget->reap_ref);
1617 }
1618
1619 int scsi_is_sdev_device(const struct device *dev)
1620 {
1621         return dev->type == &scsi_dev_type;
1622 }
1623 EXPORT_SYMBOL(scsi_is_sdev_device);
1624
1625 /* A blank transport template that is used in drivers that don't
1626  * yet implement Transport Attributes */
1627 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };