drivers/scsi/scsi_sysfs.c

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