release/src-rt-6.x.4708/linux/linux-2.6.36/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_transport.h>
  21 #include <scsi/scsi_driver.h>
  22
  23 #include "scsi_priv.h"
  24 #include "scsi_logging.h"
  25
  26 static struct device_type scsi_dev_type;
  27
  28 static const struct {
  29         enum scsi_device_state  value;
  30         char                    *name;
  31 } sdev_states[] = {
  32         { SDEV_CREATED, "created" },
  33         { SDEV_RUNNING, "running" },
  34         { SDEV_CANCEL, "cancel" },
  35         { SDEV_DEL, "deleted" },
  36         { SDEV_QUIESCE, "quiesce" },
  37         { SDEV_OFFLINE, "offline" },
  38         { SDEV_BLOCK,   "blocked" },
  39         { SDEV_CREATED_BLOCK, "created-blocked" },
  40 };
  41
  42 const char *scsi_device_state_name(enum scsi_device_state state)
  43 {
  44         int i;
  45         char *name = NULL;
  46
  47         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
  48                 if (sdev_states[i].value == state) {
  49                         name = sdev_states[i].name;
  50                         break;
  51                 }
  52         }
  53         return name;
  54 }
  55
  56 static const struct {
  57         enum scsi_host_state    value;
  58         char                    *name;
  59 } shost_states[] = {
  60         { SHOST_CREATED, "created" },
  61         { SHOST_RUNNING, "running" },
  62         { SHOST_CANCEL, "cancel" },
  63         { SHOST_DEL, "deleted" },
  64         { SHOST_RECOVERY, "recovery" },
  65         { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
  66         { SHOST_DEL_RECOVERY, "deleted/recovery", },
  67 };
  68 const char *scsi_host_state_name(enum scsi_host_state state)
  69 {
  70         int i;
  71         char *name = NULL;
  72
  73         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
  74                 if (shost_states[i].value == state) {
  75                         name = shost_states[i].name;
  76                         break;
  77                 }
  78         }
  79         return name;
  80 }
  81
  82 static int check_set(unsigned int *val, char *src)
  83 {
  84         char *last;
  85
  86         if (strncmp(src, "-", 20) == 0) {
  87                 *val = SCAN_WILD_CARD;
  88         } else {
  89                 /*
  90                  * Doesn't check for int overflow
  91                  */
  92                 *val = simple_strtoul(src, &last, 0);
  93                 if (*last != '\0')
  94                         return 1;
  95         }
  96         return 0;
  97 }
  98
  99 static int scsi_scan(struct Scsi_Host *shost, const char *str)
 100 {
 101         char s1[15], s2[15], s3[15], junk;
 102         unsigned int channel, id, lun;
 103         int res;
 104
 105         res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk);
 106         if (res != 3)
 107                 return -EINVAL;
 108         if (check_set(&channel, s1))
 109                 return -EINVAL;
 110         if (check_set(&id, s2))
 111                 return -EINVAL;
 112         if (check_set(&lun, s3))
 113                 return -EINVAL;
 114         if (shost->transportt->user_scan)
 115                 res = shost->transportt->user_scan(shost, channel, id, lun);
 116         else
 117                 res = scsi_scan_host_selected(shost, channel, id, lun, 1);
 118         return res;
 119 }
 120
 121 /*
 122  * shost_show_function: macro to create an attr function that can be used to
 123  * show a non-bit field.
 124  */
 125 #define shost_show_function(name, field, format_string)                 \
 126 static ssize_t                                                          \
 127 show_##name (struct device *dev, struct device_attribute *attr,         \
 128              char *buf)                                                 \
 129 {                                                                       \
 130         struct Scsi_Host *shost = class_to_shost(dev);                  \
 131         return snprintf (buf, 20, format_string, shost->field);         \
 132 }
 133
 134 /*
 135  * shost_rd_attr: macro to create a function and attribute variable for a
 136  * read only field.
 137  */
 138 #define shost_rd_attr2(name, field, format_string)                      \
 139         shost_show_function(name, field, format_string)                 \
 140 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
 141
 142 #define shost_rd_attr(field, format_string) \
 143 shost_rd_attr2(field, field, format_string)
 144
 145 /*
 146  * Create the actual show/store functions and data structures.
 147  */
 148
 149 static ssize_t
 150 store_scan(struct device *dev, struct device_attribute *attr,
 151            const char *buf, size_t count)
 152 {
 153         struct Scsi_Host *shost = class_to_shost(dev);
 154         int res;
 155
 156         res = scsi_scan(shost, buf);
 157         if (res == 0)
 158                 res = count;
 159         return res;
 160 };
 161 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
 162
 163 static ssize_t
 164 store_shost_state(struct device *dev, struct device_attribute *attr,
 165                   const char *buf, size_t count)
 166 {
 167         int i;
 168         struct Scsi_Host *shost = class_to_shost(dev);
 169         enum scsi_host_state state = 0;
 170
 171         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
 172                 const int len = strlen(shost_states[i].name);
 173                 if (strncmp(shost_states[i].name, buf, len) == 0 &&
 174                    buf[len] == '\n') {
 175                         state = shost_states[i].value;
 176                         break;
 177                 }
 178         }
 179         if (!state)
 180                 return -EINVAL;
 181
 182         if (scsi_host_set_state(shost, state))
 183                 return -EINVAL;
 184         return count;
 185 }
 186
 187 static ssize_t
 188 show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
 189 {
 190         struct Scsi_Host *shost = class_to_shost(dev);
 191         const char *name = scsi_host_state_name(shost->shost_state);
 192
 193         if (!name)
 194                 return -EINVAL;
 195
 196         return snprintf(buf, 20, "%s\n", name);
 197 }
 198
 199 /* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
 200 struct device_attribute dev_attr_hstate =
 201         __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
 202
 203 static ssize_t
 204 show_shost_mode(unsigned int mode, char *buf)
 205 {
 206         ssize_t len = 0;
 207
 208         if (mode & MODE_INITIATOR)
 209                 len = sprintf(buf, "%s", "Initiator");
 210
 211         if (mode & MODE_TARGET)
 212                 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
 213
 214         len += sprintf(buf + len, "\n");
 215
 216         return len;
 217 }
 218
 219 static ssize_t
 220 show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
 221                           char *buf)
 222 {
 223         struct Scsi_Host *shost = class_to_shost(dev);
 224         unsigned int supported_mode = shost->hostt->supported_mode;
 225
 226         if (supported_mode == MODE_UNKNOWN)
 227                 /* by default this should be initiator */
 228                 supported_mode = MODE_INITIATOR;
 229
 230         return show_shost_mode(supported_mode, buf);
 231 }
 232
 233 static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
 234
 235 static ssize_t
 236 show_shost_active_mode(struct device *dev,
 237                        struct device_attribute *attr, char *buf)
 238 {
 239         struct Scsi_Host *shost = class_to_shost(dev);
 240
 241         if (shost->active_mode == MODE_UNKNOWN)
 242                 return snprintf(buf, 20, "unknown\n");
 243         else
 244                 return show_shost_mode(shost->active_mode, buf);
 245 }
 246
 247 static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
 248
 249 shost_rd_attr(unique_id, "%u\n");
 250 shost_rd_attr(host_busy, "%hu\n");
 251 shost_rd_attr(cmd_per_lun, "%hd\n");
 252 shost_rd_attr(can_queue, "%hd\n");
 253 shost_rd_attr(sg_tablesize, "%hu\n");
 254 shost_rd_attr(unchecked_isa_dma, "%d\n");
 255 shost_rd_attr(prot_capabilities, "%u\n");
 256 shost_rd_attr(prot_guard_type, "%hd\n");
 257 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
 258
 259 static struct attribute *scsi_sysfs_shost_attrs[] = {
 260         &dev_attr_unique_id.attr,
 261         &dev_attr_host_busy.attr,
 262         &dev_attr_cmd_per_lun.attr,
 263         &dev_attr_can_queue.attr,
 264         &dev_attr_sg_tablesize.attr,
 265         &dev_attr_unchecked_isa_dma.attr,
 266         &dev_attr_proc_name.attr,
 267         &dev_attr_scan.attr,
 268         &dev_attr_hstate.attr,
 269         &dev_attr_supported_mode.attr,
 270         &dev_attr_active_mode.attr,
 271         &dev_attr_prot_capabilities.attr,
 272         &dev_attr_prot_guard_type.attr,
 273         NULL
 274 };
 275
 276 struct attribute_group scsi_shost_attr_group = {
 277         .attrs =        scsi_sysfs_shost_attrs,
 278 };
 279
 280 const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
 281         &scsi_shost_attr_group,
 282         NULL
 283 };
 284
 285 static void scsi_device_cls_release(struct device *class_dev)
 286 {
 287         struct scsi_device *sdev;
 288
 289         sdev = class_to_sdev(class_dev);
 290         put_device(&sdev->sdev_gendev);
 291 }
 292
 293 static void scsi_device_dev_release_usercontext(struct work_struct *work)
 294 {
 295         struct scsi_device *sdev;
 296         struct device *parent;
 297         struct scsi_target *starget;
 298         struct list_head *this, *tmp;
 299         unsigned long flags;
 300
 301         sdev = container_of(work, struct scsi_device, ew.work);
 302
 303         parent = sdev->sdev_gendev.parent;
 304         starget = to_scsi_target(parent);
 305
 306         spin_lock_irqsave(sdev->host->host_lock, flags);
 307         starget->reap_ref++;
 308         list_del(&sdev->siblings);
 309         list_del(&sdev->same_target_siblings);
 310         list_del(&sdev->starved_entry);
 311         spin_unlock_irqrestore(sdev->host->host_lock, flags);
 312
 313         cancel_work_sync(&sdev->event_work);
 314
 315         list_for_each_safe(this, tmp, &sdev->event_list) {
 316                 struct scsi_event *evt;
 317
 318                 evt = list_entry(this, struct scsi_event, node);
 319                 list_del(&evt->node);
 320                 kfree(evt);
 321         }
 322
 323         if (sdev->request_queue) {
 324                 sdev->request_queue->queuedata = NULL;
 325                 /* user context needed to free queue */
 326                 scsi_free_queue(sdev->request_queue);
 327                 /* temporary expedient, try to catch use of queue lock
 328                  * after free of sdev */
 329                 sdev->request_queue = NULL;
 330         }
 331
 332         scsi_target_reap(scsi_target(sdev));
 333
 334         kfree(sdev->inquiry);
 335         kfree(sdev);
 336
 337         if (parent)
 338                 put_device(parent);
 339 }
 340
 341 static void scsi_device_dev_release(struct device *dev)
 342 {
 343         struct scsi_device *sdp = to_scsi_device(dev);
 344         execute_in_process_context(scsi_device_dev_release_usercontext,
 345                                    &sdp->ew);
 346 }
 347
 348 static struct class sdev_class = {
 349         .name           = "scsi_device",
 350         .dev_release    = scsi_device_cls_release,
 351 };
 352
 353 /* all probing is done in the individual ->probe routines */
 354 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 355 {
 356         struct scsi_device *sdp;
 357
 358         if (dev->type != &scsi_dev_type)
 359                 return 0;
 360
 361         sdp = to_scsi_device(dev);
 362         if (sdp->no_uld_attach)
 363                 return 0;
 364         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 365 }
 366
 367 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 368 {
 369         struct scsi_device *sdev;
 370
 371         if (dev->type != &scsi_dev_type)
 372                 return 0;
 373
 374         sdev = to_scsi_device(dev);
 375
 376         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 377         return 0;
 378 }
 379
 380 struct bus_type scsi_bus_type = {
 381         .name           = "scsi",
 382         .match          = scsi_bus_match,
 383         .uevent         = scsi_bus_uevent,
 384 #ifdef CONFIG_PM_OPS
 385         .pm             = &scsi_bus_pm_ops,
 386 #endif
 387 };
 388 EXPORT_SYMBOL_GPL(scsi_bus_type);
 389
 390 int scsi_sysfs_register(void)
 391 {
 392         int error;
 393
 394         error = bus_register(&scsi_bus_type);
 395         if (!error) {
 396                 error = class_register(&sdev_class);
 397                 if (error)
 398                         bus_unregister(&scsi_bus_type);
 399         }
 400
 401         return error;
 402 }
 403
 404 void scsi_sysfs_unregister(void)
 405 {
 406         class_unregister(&sdev_class);
 407         bus_unregister(&scsi_bus_type);
 408 }
 409
 410 /*
 411  * sdev_show_function: macro to create an attr function that can be used to
 412  * show a non-bit field.
 413  */
 414 #define sdev_show_function(field, format_string)                                \
 415 static ssize_t                                                          \
 416 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 417                    char *buf)                                           \
 418 {                                                                       \
 419         struct scsi_device *sdev;                                       \
 420         sdev = to_scsi_device(dev);                                     \
 421         return snprintf (buf, 20, format_string, sdev->field);          \
 422 }                                                                       \
 423
 424 /*
 425  * sdev_rd_attr: macro to create a function and attribute variable for a
 426  * read only field.
 427  */
 428 #define sdev_rd_attr(field, format_string)                              \
 429         sdev_show_function(field, format_string)                        \
 430 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 431
 432
 433 /*
 434  * sdev_rw_attr: create a function and attribute variable for a
 435  * read/write field.
 436  */
 437 #define sdev_rw_attr(field, format_string)                              \
 438         sdev_show_function(field, format_string)                                \
 439                                                                         \
 440 static ssize_t                                                          \
 441 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 442                     const char *buf, size_t count)                      \
 443 {                                                                       \
 444         struct scsi_device *sdev;                                       \
 445         sdev = to_scsi_device(dev);                                     \
 446         sscanf (buf, format_string, &sdev->field);                      \
 447         return count;                                                   \
 448 }                                                                       \
 449 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 450
 451 /* Currently we don't export bit fields, but we might in future,
 452  * so leave this code in */
 453 /*
 454  * Create the actual show/store functions and data structures.
 455  */
 456 sdev_rd_attr (device_blocked, "%d\n");
 457 sdev_rd_attr (queue_depth, "%d\n");
 458 sdev_rd_attr (type, "%d\n");
 459 sdev_rd_attr (scsi_level, "%d\n");
 460 sdev_rd_attr (vendor, "%.8s\n");
 461 sdev_rd_attr (model, "%.16s\n");
 462 sdev_rd_attr (rev, "%.4s\n");
 463
 464 /*
 465  * TODO: can we make these symlinks to the block layer ones?
 466  */
 467 static ssize_t
 468 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 469 {
 470         struct scsi_device *sdev;
 471         sdev = to_scsi_device(dev);
 472         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
 473 }
 474
 475 static ssize_t
 476 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 477                     const char *buf, size_t count)
 478 {
 479         struct scsi_device *sdev;
 480         int timeout;
 481         sdev = to_scsi_device(dev);
 482         sscanf (buf, "%d\n", &timeout);
 483         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
 484         return count;
 485 }
 486 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 487
 488 static ssize_t
 489 store_rescan_field (struct device *dev, struct device_attribute *attr,
 490                     const char *buf, size_t count)
 491 {
 492         scsi_rescan_device(dev);
 493         return count;
 494 }
 495 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 496
 497 static void sdev_store_delete_callback(struct device *dev)
 498 {
 499         scsi_remove_device(to_scsi_device(dev));
 500 }
 501
 502 static ssize_t
 503 sdev_store_delete(struct device *dev, struct device_attribute *attr,
 504                   const char *buf, size_t count)
 505 {
 506         int rc;
 507
 508         /* An attribute cannot be unregistered by one of its own methods,
 509          * so we have to use this roundabout approach.
 510          */
 511         rc = device_schedule_callback(dev, sdev_store_delete_callback);
 512         if (rc)
 513                 count = rc;
 514         return count;
 515 };
 516 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 517
 518 static ssize_t
 519 store_state_field(struct device *dev, struct device_attribute *attr,
 520                   const char *buf, size_t count)
 521 {
 522         int i;
 523         struct scsi_device *sdev = to_scsi_device(dev);
 524         enum scsi_device_state state = 0;
 525
 526         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 527                 const int len = strlen(sdev_states[i].name);
 528                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 529                    buf[len] == '\n') {
 530                         state = sdev_states[i].value;
 531                         break;
 532                 }
 533         }
 534         if (!state)
 535                 return -EINVAL;
 536
 537         if (scsi_device_set_state(sdev, state))
 538                 return -EINVAL;
 539         return count;
 540 }
 541
 542 static ssize_t
 543 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 544 {
 545         struct scsi_device *sdev = to_scsi_device(dev);
 546         const char *name = scsi_device_state_name(sdev->sdev_state);
 547
 548         if (!name)
 549                 return -EINVAL;
 550
 551         return snprintf(buf, 20, "%s\n", name);
 552 }
 553
 554 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 555
 556 static ssize_t
 557 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 558                       char *buf)
 559 {
 560         struct scsi_device *sdev = to_scsi_device(dev);
 561         const char *name = "none";
 562
 563         if (sdev->ordered_tags)
 564                 name = "ordered";
 565         else if (sdev->simple_tags)
 566                 name = "simple";
 567
 568         return snprintf(buf, 20, "%s\n", name);
 569 }
 570
 571 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
 572
 573 static ssize_t
 574 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,                              char *buf)
 575 {
 576         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 577 }
 578
 579 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 580
 581 #define show_sdev_iostat(field)                                         \
 582 static ssize_t                                                          \
 583 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 584                     char *buf)                                          \
 585 {                                                                       \
 586         struct scsi_device *sdev = to_scsi_device(dev);                 \
 587         unsigned long long count = atomic_read(&sdev->field);           \
 588         return snprintf(buf, 20, "0x%llx\n", count);                    \
 589 }                                                                       \
 590 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 591
 592 show_sdev_iostat(iorequest_cnt);
 593 show_sdev_iostat(iodone_cnt);
 594 show_sdev_iostat(ioerr_cnt);
 595
 596 static ssize_t
 597 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 598 {
 599         struct scsi_device *sdev;
 600         sdev = to_scsi_device(dev);
 601         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 602 }
 603 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 604
 605 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 606 static ssize_t                                                          \
 607 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 608                      char *buf)                                         \
 609 {                                                                       \
 610         struct scsi_device *sdev = to_scsi_device(dev);                 \
 611         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 612         return snprintf(buf, 20, "%d\n", val);                          \
 613 }
 614
 615 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 616 static ssize_t                                                          \
 617 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 618                       const char *buf, size_t count)                    \
 619 {                                                                       \
 620         struct scsi_device *sdev = to_scsi_device(dev);                 \
 621         int val = simple_strtoul(buf, NULL, 0);                         \
 622         if (val == 0)                                                   \
 623                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 624         else if (val == 1)                                              \
 625                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 626         else                                                            \
 627                 return -EINVAL;                                         \
 628         return count;                                                   \
 629 }
 630
 631 #define DECLARE_EVT(name, Cap_name)                                     \
 632         DECLARE_EVT_SHOW(name, Cap_name)                                \
 633         DECLARE_EVT_STORE(name, Cap_name)                               \
 634         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 635                            sdev_store_evt_##name);
 636 #define REF_EVT(name) &dev_attr_evt_##name.attr
 637
 638 DECLARE_EVT(media_change, MEDIA_CHANGE)
 639
 640 /* Default template for device attributes.  May NOT be modified */
 641 static struct attribute *scsi_sdev_attrs[] = {
 642         &dev_attr_device_blocked.attr,
 643         &dev_attr_type.attr,
 644         &dev_attr_scsi_level.attr,
 645         &dev_attr_vendor.attr,
 646         &dev_attr_model.attr,
 647         &dev_attr_rev.attr,
 648         &dev_attr_rescan.attr,
 649         &dev_attr_delete.attr,
 650         &dev_attr_state.attr,
 651         &dev_attr_timeout.attr,
 652         &dev_attr_iocounterbits.attr,
 653         &dev_attr_iorequest_cnt.attr,
 654         &dev_attr_iodone_cnt.attr,
 655         &dev_attr_ioerr_cnt.attr,
 656         &dev_attr_modalias.attr,
 657         REF_EVT(media_change),
 658         NULL
 659 };
 660
 661 static struct attribute_group scsi_sdev_attr_group = {
 662         .attrs =        scsi_sdev_attrs,
 663 };
 664
 665 static const struct attribute_group *scsi_sdev_attr_groups[] = {
 666         &scsi_sdev_attr_group,
 667         NULL
 668 };
 669
 670 static ssize_t
 671 sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
 672                           const char *buf, size_t count)
 673 {
 674         int depth, retval;
 675         struct scsi_device *sdev = to_scsi_device(dev);
 676         struct scsi_host_template *sht = sdev->host->hostt;
 677
 678         if (!sht->change_queue_depth)
 679                 return -EINVAL;
 680
 681         depth = simple_strtoul(buf, NULL, 0);
 682
 683         if (depth < 1)
 684                 return -EINVAL;
 685
 686         retval = sht->change_queue_depth(sdev, depth,
 687                                          SCSI_QDEPTH_DEFAULT);
 688         if (retval < 0)
 689                 return retval;
 690
 691         sdev->max_queue_depth = sdev->queue_depth;
 692
 693         return count;
 694 }
 695
 696 static struct device_attribute sdev_attr_queue_depth_rw =
 697         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 698                sdev_store_queue_depth_rw);
 699
 700 static ssize_t
 701 sdev_show_queue_ramp_up_period(struct device *dev,
 702                                struct device_attribute *attr,
 703                                char *buf)
 704 {
 705         struct scsi_device *sdev;
 706         sdev = to_scsi_device(dev);
 707         return snprintf(buf, 20, "%u\n",
 708                         jiffies_to_msecs(sdev->queue_ramp_up_period));
 709 }
 710
 711 static ssize_t
 712 sdev_store_queue_ramp_up_period(struct device *dev,
 713                                 struct device_attribute *attr,
 714                                 const char *buf, size_t count)
 715 {
 716         struct scsi_device *sdev = to_scsi_device(dev);
 717         unsigned long period;
 718
 719         if (strict_strtoul(buf, 10, &period))
 720                 return -EINVAL;
 721
 722         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
 723         return period;
 724 }
 725
 726 static struct device_attribute sdev_attr_queue_ramp_up_period =
 727         __ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
 728                sdev_show_queue_ramp_up_period,
 729                sdev_store_queue_ramp_up_period);
 730
 731 static ssize_t
 732 sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
 733                          const char *buf, size_t count)
 734 {
 735         struct scsi_device *sdev = to_scsi_device(dev);
 736         struct scsi_host_template *sht = sdev->host->hostt;
 737         int tag_type = 0, retval;
 738         int prev_tag_type = scsi_get_tag_type(sdev);
 739
 740         if (!sdev->tagged_supported || !sht->change_queue_type)
 741                 return -EINVAL;
 742
 743         if (strncmp(buf, "ordered", 7) == 0)
 744                 tag_type = MSG_ORDERED_TAG;
 745         else if (strncmp(buf, "simple", 6) == 0)
 746                 tag_type = MSG_SIMPLE_TAG;
 747         else if (strncmp(buf, "none", 4) != 0)
 748                 return -EINVAL;
 749
 750         if (tag_type == prev_tag_type)
 751                 return count;
 752
 753         retval = sht->change_queue_type(sdev, tag_type);
 754         if (retval < 0)
 755                 return retval;
 756
 757         return count;
 758 }
 759
 760 static int scsi_target_add(struct scsi_target *starget)
 761 {
 762         int error;
 763
 764         if (starget->state != STARGET_CREATED)
 765                 return 0;
 766
 767         error = device_add(&starget->dev);
 768         if (error) {
 769                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
 770                 return error;
 771         }
 772         transport_add_device(&starget->dev);
 773         starget->state = STARGET_RUNNING;
 774
 775         pm_runtime_set_active(&starget->dev);
 776         pm_runtime_enable(&starget->dev);
 777         device_enable_async_suspend(&starget->dev);
 778
 779         return 0;
 780 }
 781
 782 static struct device_attribute sdev_attr_queue_type_rw =
 783         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 784                sdev_store_queue_type_rw);
 785
 786 /**
 787  * scsi_sysfs_add_sdev - add scsi device to sysfs
 788  * @sdev:       scsi_device to add
 789  *
 790  * Return value:
 791  *      0 on Success / non-zero on Failure
 792  **/
 793 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 794 {
 795         int error, i;
 796         struct request_queue *rq = sdev->request_queue;
 797         struct scsi_target *starget = sdev->sdev_target;
 798
 799         error = scsi_device_set_state(sdev, SDEV_RUNNING);
 800         if (error)
 801                 return error;
 802
 803         error = scsi_target_add(starget);
 804         if (error)
 805                 return error;
 806
 807         transport_configure_device(&starget->dev);
 808
 809         device_enable_async_suspend(&sdev->sdev_gendev);
 810         scsi_autopm_get_target(starget);
 811         pm_runtime_set_active(&sdev->sdev_gendev);
 812         pm_runtime_forbid(&sdev->sdev_gendev);
 813         pm_runtime_enable(&sdev->sdev_gendev);
 814         scsi_autopm_put_target(starget);
 815
 816         /* The following call will keep sdev active indefinitely, until
 817          * its driver does a corresponding scsi_autopm_pm_device().  Only
 818          * drivers supporting autosuspend will do this.
 819          */
 820         scsi_autopm_get_device(sdev);
 821
 822         error = device_add(&sdev->sdev_gendev);
 823         if (error) {
 824                 printk(KERN_INFO "error 1\n");
 825                 return error;
 826         }
 827         device_enable_async_suspend(&sdev->sdev_dev);
 828         error = device_add(&sdev->sdev_dev);
 829         if (error) {
 830                 printk(KERN_INFO "error 2\n");
 831                 device_del(&sdev->sdev_gendev);
 832                 return error;
 833         }
 834         transport_add_device(&sdev->sdev_gendev);
 835         sdev->is_visible = 1;
 836
 837         /* create queue files, which may be writable, depending on the host */
 838         if (sdev->host->hostt->change_queue_depth) {
 839                 error = device_create_file(&sdev->sdev_gendev,
 840                                            &sdev_attr_queue_depth_rw);
 841                 error = device_create_file(&sdev->sdev_gendev,
 842                                            &sdev_attr_queue_ramp_up_period);
 843         }
 844         else
 845                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
 846         if (error)
 847                 return error;
 848
 849         if (sdev->host->hostt->change_queue_type)
 850                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
 851         else
 852                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
 853         if (error)
 854                 return error;
 855
 856         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
 857
 858         if (error)
 859                 /* we're treating error on bsg register as non-fatal,
 860                  * so pretend nothing went wrong */
 861                 sdev_printk(KERN_INFO, sdev,
 862                             "Failed to register bsg queue, errno=%d\n", error);
 863
 864         /* add additional host specific attributes */
 865         if (sdev->host->hostt->sdev_attrs) {
 866                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
 867                         error = device_create_file(&sdev->sdev_gendev,
 868                                         sdev->host->hostt->sdev_attrs[i]);
 869                         if (error)
 870                                 return error;
 871                 }
 872         }
 873
 874         return error;
 875 }
 876
 877 void __scsi_remove_device(struct scsi_device *sdev)
 878 {
 879         struct device *dev = &sdev->sdev_gendev;
 880
 881         if (sdev->is_visible) {
 882                 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
 883                         return;
 884
 885                 bsg_unregister_queue(sdev->request_queue);
 886                 device_unregister(&sdev->sdev_dev);
 887                 transport_remove_device(dev);
 888                 device_del(dev);
 889         } else
 890                 put_device(&sdev->sdev_dev);
 891         scsi_device_set_state(sdev, SDEV_DEL);
 892         if (sdev->host->hostt->slave_destroy)
 893                 sdev->host->hostt->slave_destroy(sdev);
 894         transport_destroy_device(dev);
 895         put_device(dev);
 896 }
 897
 898 /**
 899  * scsi_remove_device - unregister a device from the scsi bus
 900  * @sdev:       scsi_device to unregister
 901  **/
 902 void scsi_remove_device(struct scsi_device *sdev)
 903 {
 904         struct Scsi_Host *shost = sdev->host;
 905
 906         mutex_lock(&shost->scan_mutex);
 907         __scsi_remove_device(sdev);
 908         mutex_unlock(&shost->scan_mutex);
 909 }
 910 EXPORT_SYMBOL(scsi_remove_device);
 911
 912 static void __scsi_remove_target(struct scsi_target *starget)
 913 {
 914         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 915         unsigned long flags;
 916         struct scsi_device *sdev;
 917
 918         spin_lock_irqsave(shost->host_lock, flags);
 919         starget->reap_ref++;
 920  restart:
 921         list_for_each_entry(sdev, &shost->__devices, siblings) {
 922                 if (sdev->channel != starget->channel ||
 923                     sdev->id != starget->id ||
 924                     scsi_device_get(sdev))
 925                         continue;
 926                 spin_unlock_irqrestore(shost->host_lock, flags);
 927                 scsi_remove_device(sdev);
 928                 scsi_device_put(sdev);
 929                 spin_lock_irqsave(shost->host_lock, flags);
 930                 goto restart;
 931         }
 932         spin_unlock_irqrestore(shost->host_lock, flags);
 933         scsi_target_reap(starget);
 934 }
 935
 936 static int __remove_child (struct device * dev, void * data)
 937 {
 938         if (scsi_is_target_device(dev))
 939                 __scsi_remove_target(to_scsi_target(dev));
 940         return 0;
 941 }
 942
 943 /**
 944  * scsi_remove_target - try to remove a target and all its devices
 945  * @dev: generic starget or parent of generic stargets to be removed
 946  *
 947  * Note: This is slightly racy.  It is possible that if the user
 948  * requests the addition of another device then the target won't be
 949  * removed.
 950  */
 951 void scsi_remove_target(struct device *dev)
 952 {
 953         struct device *rdev;
 954
 955         if (scsi_is_target_device(dev)) {
 956                 __scsi_remove_target(to_scsi_target(dev));
 957                 return;
 958         }
 959
 960         rdev = get_device(dev);
 961         device_for_each_child(dev, NULL, __remove_child);
 962         put_device(rdev);
 963 }
 964 EXPORT_SYMBOL(scsi_remove_target);
 965
 966 int scsi_register_driver(struct device_driver *drv)
 967 {
 968         drv->bus = &scsi_bus_type;
 969
 970         return driver_register(drv);
 971 }
 972 EXPORT_SYMBOL(scsi_register_driver);
 973
 974 int scsi_register_interface(struct class_interface *intf)
 975 {
 976         intf->class = &sdev_class;
 977
 978         return class_interface_register(intf);
 979 }
 980 EXPORT_SYMBOL(scsi_register_interface);
 981
 982 /**
 983  * scsi_sysfs_add_host - add scsi host to subsystem
 984  * @shost:     scsi host struct to add to subsystem
 985  **/
 986 int scsi_sysfs_add_host(struct Scsi_Host *shost)
 987 {
 988         int error, i;
 989
 990         /* add host specific attributes */
 991         if (shost->hostt->shost_attrs) {
 992                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
 993                         error = device_create_file(&shost->shost_dev,
 994                                         shost->hostt->shost_attrs[i]);
 995                         if (error)
 996                                 return error;
 997                 }
 998         }
 999
1000         transport_register_device(&shost->shost_gendev);
1001         transport_configure_device(&shost->shost_gendev);
1002         return 0;
1003 }
1004
1005 static struct device_type scsi_dev_type = {
1006         .name =         "scsi_device",
1007         .release =      scsi_device_dev_release,
1008         .groups =       scsi_sdev_attr_groups,
1009 };
1010
1011 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1012 {
1013         unsigned long flags;
1014         struct Scsi_Host *shost = sdev->host;
1015         struct scsi_target  *starget = sdev->sdev_target;
1016
1017         device_initialize(&sdev->sdev_gendev);
1018         sdev->sdev_gendev.bus = &scsi_bus_type;
1019         sdev->sdev_gendev.type = &scsi_dev_type;
1020         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%d",
1021                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1022
1023         device_initialize(&sdev->sdev_dev);
1024         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1025         sdev->sdev_dev.class = &sdev_class;
1026         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%d",
1027                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1028         sdev->scsi_level = starget->scsi_level;
1029         transport_setup_device(&sdev->sdev_gendev);
1030         spin_lock_irqsave(shost->host_lock, flags);
1031         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1032         list_add_tail(&sdev->siblings, &shost->__devices);
1033         spin_unlock_irqrestore(shost->host_lock, flags);
1034 }
1035
1036 int scsi_is_sdev_device(const struct device *dev)
1037 {
1038         return dev->type == &scsi_dev_type;
1039 }
1040 EXPORT_SYMBOL(scsi_is_sdev_device);
1041
1042 /* A blank transport template that is used in drivers that don't
1043  * yet implement Transport Attributes */
1044 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };