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_TRANSPORT_OFFLINE, "transport-offline" },
  39         { SDEV_BLOCK,   "blocked" },
  40         { SDEV_CREATED_BLOCK, "created-blocked" },
  41 };
  42
  43 const char *scsi_device_state_name(enum scsi_device_state state)
  44 {
  45         int i;
  46         char *name = NULL;
  47
  48         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
  49                 if (sdev_states[i].value == state) {
  50                         name = sdev_states[i].name;
  51                         break;
  52                 }
  53         }
  54         return name;
  55 }
  56
  57 static const struct {
  58         enum scsi_host_state    value;
  59         char                    *name;
  60 } shost_states[] = {
  61         { SHOST_CREATED, "created" },
  62         { SHOST_RUNNING, "running" },
  63         { SHOST_CANCEL, "cancel" },
  64         { SHOST_DEL, "deleted" },
  65         { SHOST_RECOVERY, "recovery" },
  66         { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
  67         { SHOST_DEL_RECOVERY, "deleted/recovery", },
  68 };
  69 const char *scsi_host_state_name(enum scsi_host_state state)
  70 {
  71         int i;
  72         char *name = NULL;
  73
  74         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
  75                 if (shost_states[i].value == state) {
  76                         name = shost_states[i].name;
  77                         break;
  78                 }
  79         }
  80         return name;
  81 }
  82
  83 static int check_set(unsigned int *val, char *src)
  84 {
  85         char *last;
  86
  87         if (strncmp(src, "-", 20) == 0) {
  88                 *val = SCAN_WILD_CARD;
  89         } else {
  90                 /*
  91                  * Doesn't check for int overflow
  92                  */
  93                 *val = simple_strtoul(src, &last, 0);
  94                 if (*last != '\0')
  95                         return 1;
  96         }
  97         return 0;
  98 }
  99
 100 static int scsi_scan(struct Scsi_Host *shost, const char *str)
 101 {
 102         char s1[15], s2[15], s3[15], junk;
 103         unsigned int channel, id, lun;
 104         int res;
 105
 106         res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk);
 107         if (res != 3)
 108                 return -EINVAL;
 109         if (check_set(&channel, s1))
 110                 return -EINVAL;
 111         if (check_set(&id, s2))
 112                 return -EINVAL;
 113         if (check_set(&lun, s3))
 114                 return -EINVAL;
 115         if (shost->transportt->user_scan)
 116                 res = shost->transportt->user_scan(shost, channel, id, lun);
 117         else
 118                 res = scsi_scan_host_selected(shost, channel, id, lun, 1);
 119         return res;
 120 }
 121
 122 /*
 123  * shost_show_function: macro to create an attr function that can be used to
 124  * show a non-bit field.
 125  */
 126 #define shost_show_function(name, field, format_string)                 \
 127 static ssize_t                                                          \
 128 show_##name (struct device *dev, struct device_attribute *attr,         \
 129              char *buf)                                                 \
 130 {                                                                       \
 131         struct Scsi_Host *shost = class_to_shost(dev);                  \
 132         return snprintf (buf, 20, format_string, shost->field);         \
 133 }
 134
 135 /*
 136  * shost_rd_attr: macro to create a function and attribute variable for a
 137  * read only field.
 138  */
 139 #define shost_rd_attr2(name, field, format_string)                      \
 140         shost_show_function(name, field, format_string)                 \
 141 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
 142
 143 #define shost_rd_attr(field, format_string) \
 144 shost_rd_attr2(field, field, format_string)
 145
 146 /*
 147  * Create the actual show/store functions and data structures.
 148  */
 149
 150 static ssize_t
 151 store_scan(struct device *dev, struct device_attribute *attr,
 152            const char *buf, size_t count)
 153 {
 154         struct Scsi_Host *shost = class_to_shost(dev);
 155         int res;
 156
 157         res = scsi_scan(shost, buf);
 158         if (res == 0)
 159                 res = count;
 160         return res;
 161 };
 162 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
 163
 164 static ssize_t
 165 store_shost_state(struct device *dev, struct device_attribute *attr,
 166                   const char *buf, size_t count)
 167 {
 168         int i;
 169         struct Scsi_Host *shost = class_to_shost(dev);
 170         enum scsi_host_state state = 0;
 171
 172         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
 173                 const int len = strlen(shost_states[i].name);
 174                 if (strncmp(shost_states[i].name, buf, len) == 0 &&
 175                    buf[len] == '\n') {
 176                         state = shost_states[i].value;
 177                         break;
 178                 }
 179         }
 180         if (!state)
 181                 return -EINVAL;
 182
 183         if (scsi_host_set_state(shost, state))
 184                 return -EINVAL;
 185         return count;
 186 }
 187
 188 static ssize_t
 189 show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
 190 {
 191         struct Scsi_Host *shost = class_to_shost(dev);
 192         const char *name = scsi_host_state_name(shost->shost_state);
 193
 194         if (!name)
 195                 return -EINVAL;
 196
 197         return snprintf(buf, 20, "%s\n", name);
 198 }
 199
 200 /* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
 201 struct device_attribute dev_attr_hstate =
 202         __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
 203
 204 static ssize_t
 205 show_shost_mode(unsigned int mode, char *buf)
 206 {
 207         ssize_t len = 0;
 208
 209         if (mode & MODE_INITIATOR)
 210                 len = sprintf(buf, "%s", "Initiator");
 211
 212         if (mode & MODE_TARGET)
 213                 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
 214
 215         len += sprintf(buf + len, "\n");
 216
 217         return len;
 218 }
 219
 220 static ssize_t
 221 show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
 222                           char *buf)
 223 {
 224         struct Scsi_Host *shost = class_to_shost(dev);
 225         unsigned int supported_mode = shost->hostt->supported_mode;
 226
 227         if (supported_mode == MODE_UNKNOWN)
 228                 /* by default this should be initiator */
 229                 supported_mode = MODE_INITIATOR;
 230
 231         return show_shost_mode(supported_mode, buf);
 232 }
 233
 234 static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
 235
 236 static ssize_t
 237 show_shost_active_mode(struct device *dev,
 238                        struct device_attribute *attr, char *buf)
 239 {
 240         struct Scsi_Host *shost = class_to_shost(dev);
 241
 242         if (shost->active_mode == MODE_UNKNOWN)
 243                 return snprintf(buf, 20, "unknown\n");
 244         else
 245                 return show_shost_mode(shost->active_mode, buf);
 246 }
 247
 248 static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
 249
 250 static int check_reset_type(char *str)
 251 {
 252         if (strncmp(str, "adapter", 10) == 0)
 253                 return SCSI_ADAPTER_RESET;
 254         else if (strncmp(str, "firmware", 10) == 0)
 255                 return SCSI_FIRMWARE_RESET;
 256         else
 257                 return 0;
 258 }
 259
 260 static ssize_t
 261 store_host_reset(struct device *dev, struct device_attribute *attr,
 262                 const char *buf, size_t count)
 263 {
 264         struct Scsi_Host *shost = class_to_shost(dev);
 265         struct scsi_host_template *sht = shost->hostt;
 266         int ret = -EINVAL;
 267         char str[10];
 268         int type;
 269
 270         sscanf(buf, "%s", str);
 271         type = check_reset_type(str);
 272
 273         if (!type)
 274                 goto exit_store_host_reset;
 275
 276         if (sht->host_reset)
 277                 ret = sht->host_reset(shost, type);
 278
 279 exit_store_host_reset:
 280         if (ret == 0)
 281                 ret = count;
 282         return ret;
 283 }
 284
 285 static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
 286
 287 shost_rd_attr(unique_id, "%u\n");
 288 shost_rd_attr(host_busy, "%hu\n");
 289 shost_rd_attr(cmd_per_lun, "%hd\n");
 290 shost_rd_attr(can_queue, "%hd\n");
 291 shost_rd_attr(sg_tablesize, "%hu\n");
 292 shost_rd_attr(sg_prot_tablesize, "%hu\n");
 293 shost_rd_attr(unchecked_isa_dma, "%d\n");
 294 shost_rd_attr(prot_capabilities, "%u\n");
 295 shost_rd_attr(prot_guard_type, "%hd\n");
 296 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
 297
 298 static struct attribute *scsi_sysfs_shost_attrs[] = {
 299         &dev_attr_unique_id.attr,
 300         &dev_attr_host_busy.attr,
 301         &dev_attr_cmd_per_lun.attr,
 302         &dev_attr_can_queue.attr,
 303         &dev_attr_sg_tablesize.attr,
 304         &dev_attr_sg_prot_tablesize.attr,
 305         &dev_attr_unchecked_isa_dma.attr,
 306         &dev_attr_proc_name.attr,
 307         &dev_attr_scan.attr,
 308         &dev_attr_hstate.attr,
 309         &dev_attr_supported_mode.attr,
 310         &dev_attr_active_mode.attr,
 311         &dev_attr_prot_capabilities.attr,
 312         &dev_attr_prot_guard_type.attr,
 313         &dev_attr_host_reset.attr,
 314         NULL
 315 };
 316
 317 struct attribute_group scsi_shost_attr_group = {
 318         .attrs =        scsi_sysfs_shost_attrs,
 319 };
 320
 321 const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
 322         &scsi_shost_attr_group,
 323         NULL
 324 };
 325
 326 static void scsi_device_cls_release(struct device *class_dev)
 327 {
 328         struct scsi_device *sdev;
 329
 330         sdev = class_to_sdev(class_dev);
 331         put_device(&sdev->sdev_gendev);
 332 }
 333
 334 static void scsi_device_dev_release_usercontext(struct work_struct *work)
 335 {
 336         struct scsi_device *sdev;
 337         struct device *parent;
 338         struct scsi_target *starget;
 339         struct list_head *this, *tmp;
 340         unsigned long flags;
 341
 342         sdev = container_of(work, struct scsi_device, ew.work);
 343
 344         parent = sdev->sdev_gendev.parent;
 345         starget = to_scsi_target(parent);
 346
 347         spin_lock_irqsave(sdev->host->host_lock, flags);
 348         starget->reap_ref++;
 349         list_del(&sdev->siblings);
 350         list_del(&sdev->same_target_siblings);
 351         list_del(&sdev->starved_entry);
 352         spin_unlock_irqrestore(sdev->host->host_lock, flags);
 353
 354         cancel_work_sync(&sdev->event_work);
 355
 356         list_for_each_safe(this, tmp, &sdev->event_list) {
 357                 struct scsi_event *evt;
 358
 359                 evt = list_entry(this, struct scsi_event, node);
 360                 list_del(&evt->node);
 361                 kfree(evt);
 362         }
 363
 364         blk_put_queue(sdev->request_queue);
 365         /* NULL queue means the device can't be used */
 366         sdev->request_queue = NULL;
 367
 368         scsi_target_reap(scsi_target(sdev));
 369
 370         kfree(sdev->inquiry);
 371         kfree(sdev);
 372
 373         if (parent)
 374                 put_device(parent);
 375 }
 376
 377 static void scsi_device_dev_release(struct device *dev)
 378 {
 379         struct scsi_device *sdp = to_scsi_device(dev);
 380         execute_in_process_context(scsi_device_dev_release_usercontext,
 381                                    &sdp->ew);
 382 }
 383
 384 static struct class sdev_class = {
 385         .name           = "scsi_device",
 386         .dev_release    = scsi_device_cls_release,
 387 };
 388
 389 /* all probing is done in the individual ->probe routines */
 390 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 391 {
 392         struct scsi_device *sdp;
 393
 394         if (dev->type != &scsi_dev_type)
 395                 return 0;
 396
 397         sdp = to_scsi_device(dev);
 398         if (sdp->no_uld_attach)
 399                 return 0;
 400         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 401 }
 402
 403 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 404 {
 405         struct scsi_device *sdev;
 406
 407         if (dev->type != &scsi_dev_type)
 408                 return 0;
 409
 410         sdev = to_scsi_device(dev);
 411
 412         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 413         return 0;
 414 }
 415
 416 struct bus_type scsi_bus_type = {
 417         .name           = "scsi",
 418         .match          = scsi_bus_match,
 419         .uevent         = scsi_bus_uevent,
 420 #ifdef CONFIG_PM
 421         .pm             = &scsi_bus_pm_ops,
 422 #endif
 423 };
 424 EXPORT_SYMBOL_GPL(scsi_bus_type);
 425
 426 int scsi_sysfs_register(void)
 427 {
 428         int error;
 429
 430         error = bus_register(&scsi_bus_type);
 431         if (!error) {
 432                 error = class_register(&sdev_class);
 433                 if (error)
 434                         bus_unregister(&scsi_bus_type);
 435         }
 436
 437         return error;
 438 }
 439
 440 void scsi_sysfs_unregister(void)
 441 {
 442         class_unregister(&sdev_class);
 443         bus_unregister(&scsi_bus_type);
 444 }
 445
 446 /*
 447  * sdev_show_function: macro to create an attr function that can be used to
 448  * show a non-bit field.
 449  */
 450 #define sdev_show_function(field, format_string)                                \
 451 static ssize_t                                                          \
 452 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 453                    char *buf)                                           \
 454 {                                                                       \
 455         struct scsi_device *sdev;                                       \
 456         sdev = to_scsi_device(dev);                                     \
 457         return snprintf (buf, 20, format_string, sdev->field);          \
 458 }                                                                       \
 459
 460 /*
 461  * sdev_rd_attr: macro to create a function and attribute variable for a
 462  * read only field.
 463  */
 464 #define sdev_rd_attr(field, format_string)                              \
 465         sdev_show_function(field, format_string)                        \
 466 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 467
 468
 469 /*
 470  * sdev_rw_attr: create a function and attribute variable for a
 471  * read/write field.
 472  */
 473 #define sdev_rw_attr(field, format_string)                              \
 474         sdev_show_function(field, format_string)                                \
 475                                                                         \
 476 static ssize_t                                                          \
 477 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 478                     const char *buf, size_t count)                      \
 479 {                                                                       \
 480         struct scsi_device *sdev;                                       \
 481         sdev = to_scsi_device(dev);                                     \
 482         sscanf (buf, format_string, &sdev->field);                      \
 483         return count;                                                   \
 484 }                                                                       \
 485 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 486
 487 /* Currently we don't export bit fields, but we might in future,
 488  * so leave this code in */
 489 #if 0
 490 /*
 491  * sdev_rd_attr: create a function and attribute variable for a
 492  * read/write bit field.
 493  */
 494 #define sdev_rw_attr_bit(field)                                         \
 495         sdev_show_function(field, "%d\n")                                       \
 496                                                                         \
 497 static ssize_t                                                          \
 498 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 499                     const char *buf, size_t count)                      \
 500 {                                                                       \
 501         int ret;                                                        \
 502         struct scsi_device *sdev;                                       \
 503         ret = scsi_sdev_check_buf_bit(buf);                             \
 504         if (ret >= 0)   {                                               \
 505                 sdev = to_scsi_device(dev);                             \
 506                 sdev->field = ret;                                      \
 507                 ret = count;                                            \
 508         }                                                               \
 509         return ret;                                                     \
 510 }                                                                       \
 511 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 512
 513 /*
 514  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 515  * else return -EINVAL.
 516  */
 517 static int scsi_sdev_check_buf_bit(const char *buf)
 518 {
 519         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 520                 if (buf[0] == '1')
 521                         return 1;
 522                 else if (buf[0] == '0')
 523                         return 0;
 524                 else
 525                         return -EINVAL;
 526         } else
 527                 return -EINVAL;
 528 }
 529 #endif
 530 /*
 531  * Create the actual show/store functions and data structures.
 532  */
 533 sdev_rd_attr (device_blocked, "%d\n");
 534 sdev_rd_attr (queue_depth, "%d\n");
 535 sdev_rd_attr (type, "%d\n");
 536 sdev_rd_attr (scsi_level, "%d\n");
 537 sdev_rd_attr (vendor, "%.8s\n");
 538 sdev_rd_attr (model, "%.16s\n");
 539 sdev_rd_attr (rev, "%.4s\n");
 540
 541 /*
 542  * TODO: can we make these symlinks to the block layer ones?
 543  */
 544 static ssize_t
 545 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 546 {
 547         struct scsi_device *sdev;
 548         sdev = to_scsi_device(dev);
 549         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
 550 }
 551
 552 static ssize_t
 553 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 554                     const char *buf, size_t count)
 555 {
 556         struct scsi_device *sdev;
 557         int timeout;
 558         sdev = to_scsi_device(dev);
 559         sscanf (buf, "%d\n", &timeout);
 560         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
 561         return count;
 562 }
 563 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 564
 565 static ssize_t
 566 store_rescan_field (struct device *dev, struct device_attribute *attr,
 567                     const char *buf, size_t count)
 568 {
 569         scsi_rescan_device(dev);
 570         return count;
 571 }
 572 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 573
 574 static void sdev_store_delete_callback(struct device *dev)
 575 {
 576         scsi_remove_device(to_scsi_device(dev));
 577 }
 578
 579 static ssize_t
 580 sdev_store_delete(struct device *dev, struct device_attribute *attr,
 581                   const char *buf, size_t count)
 582 {
 583         int rc;
 584
 585         /* An attribute cannot be unregistered by one of its own methods,
 586          * so we have to use this roundabout approach.
 587          */
 588         rc = device_schedule_callback(dev, sdev_store_delete_callback);
 589         if (rc)
 590                 count = rc;
 591         return count;
 592 };
 593 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 594
 595 static ssize_t
 596 store_state_field(struct device *dev, struct device_attribute *attr,
 597                   const char *buf, size_t count)
 598 {
 599         int i;
 600         struct scsi_device *sdev = to_scsi_device(dev);
 601         enum scsi_device_state state = 0;
 602
 603         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 604                 const int len = strlen(sdev_states[i].name);
 605                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 606                    buf[len] == '\n') {
 607                         state = sdev_states[i].value;
 608                         break;
 609                 }
 610         }
 611         if (!state)
 612                 return -EINVAL;
 613
 614         if (scsi_device_set_state(sdev, state))
 615                 return -EINVAL;
 616         return count;
 617 }
 618
 619 static ssize_t
 620 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 621 {
 622         struct scsi_device *sdev = to_scsi_device(dev);
 623         const char *name = scsi_device_state_name(sdev->sdev_state);
 624
 625         if (!name)
 626                 return -EINVAL;
 627
 628         return snprintf(buf, 20, "%s\n", name);
 629 }
 630
 631 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 632
 633 static ssize_t
 634 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 635                       char *buf)
 636 {
 637         struct scsi_device *sdev = to_scsi_device(dev);
 638         const char *name = "none";
 639
 640         if (sdev->ordered_tags)
 641                 name = "ordered";
 642         else if (sdev->simple_tags)
 643                 name = "simple";
 644
 645         return snprintf(buf, 20, "%s\n", name);
 646 }
 647
 648 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
 649
 650 static ssize_t
 651 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,                              char *buf)
 652 {
 653         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 654 }
 655
 656 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 657
 658 #define show_sdev_iostat(field)                                         \
 659 static ssize_t                                                          \
 660 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 661                     char *buf)                                          \
 662 {                                                                       \
 663         struct scsi_device *sdev = to_scsi_device(dev);                 \
 664         unsigned long long count = atomic_read(&sdev->field);           \
 665         return snprintf(buf, 20, "0x%llx\n", count);                    \
 666 }                                                                       \
 667 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 668
 669 show_sdev_iostat(iorequest_cnt);
 670 show_sdev_iostat(iodone_cnt);
 671 show_sdev_iostat(ioerr_cnt);
 672
 673 static ssize_t
 674 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 675 {
 676         struct scsi_device *sdev;
 677         sdev = to_scsi_device(dev);
 678         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 679 }
 680 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 681
 682 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 683 static ssize_t                                                          \
 684 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 685                      char *buf)                                         \
 686 {                                                                       \
 687         struct scsi_device *sdev = to_scsi_device(dev);                 \
 688         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 689         return snprintf(buf, 20, "%d\n", val);                          \
 690 }
 691
 692 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 693 static ssize_t                                                          \
 694 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 695                       const char *buf, size_t count)                    \
 696 {                                                                       \
 697         struct scsi_device *sdev = to_scsi_device(dev);                 \
 698         int val = simple_strtoul(buf, NULL, 0);                         \
 699         if (val == 0)                                                   \
 700                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 701         else if (val == 1)                                              \
 702                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 703         else                                                            \
 704                 return -EINVAL;                                         \
 705         return count;                                                   \
 706 }
 707
 708 #define DECLARE_EVT(name, Cap_name)                                     \
 709         DECLARE_EVT_SHOW(name, Cap_name)                                \
 710         DECLARE_EVT_STORE(name, Cap_name)                               \
 711         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 712                            sdev_store_evt_##name);
 713 #define REF_EVT(name) &dev_attr_evt_##name.attr
 714
 715 DECLARE_EVT(media_change, MEDIA_CHANGE)
 716
 717 /* Default template for device attributes.  May NOT be modified */
 718 static struct attribute *scsi_sdev_attrs[] = {
 719         &dev_attr_device_blocked.attr,
 720         &dev_attr_type.attr,
 721         &dev_attr_scsi_level.attr,
 722         &dev_attr_vendor.attr,
 723         &dev_attr_model.attr,
 724         &dev_attr_rev.attr,
 725         &dev_attr_rescan.attr,
 726         &dev_attr_delete.attr,
 727         &dev_attr_state.attr,
 728         &dev_attr_timeout.attr,
 729         &dev_attr_iocounterbits.attr,
 730         &dev_attr_iorequest_cnt.attr,
 731         &dev_attr_iodone_cnt.attr,
 732         &dev_attr_ioerr_cnt.attr,
 733         &dev_attr_modalias.attr,
 734         REF_EVT(media_change),
 735         NULL
 736 };
 737
 738 static struct attribute_group scsi_sdev_attr_group = {
 739         .attrs =        scsi_sdev_attrs,
 740 };
 741
 742 static const struct attribute_group *scsi_sdev_attr_groups[] = {
 743         &scsi_sdev_attr_group,
 744         NULL
 745 };
 746
 747 static ssize_t
 748 sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
 749                           const char *buf, size_t count)
 750 {
 751         int depth, retval;
 752         struct scsi_device *sdev = to_scsi_device(dev);
 753         struct scsi_host_template *sht = sdev->host->hostt;
 754
 755         if (!sht->change_queue_depth)
 756                 return -EINVAL;
 757
 758         depth = simple_strtoul(buf, NULL, 0);
 759
 760         if (depth < 1)
 761                 return -EINVAL;
 762
 763         retval = sht->change_queue_depth(sdev, depth,
 764                                          SCSI_QDEPTH_DEFAULT);
 765         if (retval < 0)
 766                 return retval;
 767
 768         sdev->max_queue_depth = sdev->queue_depth;
 769
 770         return count;
 771 }
 772
 773 static struct device_attribute sdev_attr_queue_depth_rw =
 774         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 775                sdev_store_queue_depth_rw);
 776
 777 static ssize_t
 778 sdev_show_queue_ramp_up_period(struct device *dev,
 779                                struct device_attribute *attr,
 780                                char *buf)
 781 {
 782         struct scsi_device *sdev;
 783         sdev = to_scsi_device(dev);
 784         return snprintf(buf, 20, "%u\n",
 785                         jiffies_to_msecs(sdev->queue_ramp_up_period));
 786 }
 787
 788 static ssize_t
 789 sdev_store_queue_ramp_up_period(struct device *dev,
 790                                 struct device_attribute *attr,
 791                                 const char *buf, size_t count)
 792 {
 793         struct scsi_device *sdev = to_scsi_device(dev);
 794         unsigned long period;
 795
 796         if (strict_strtoul(buf, 10, &period))
 797                 return -EINVAL;
 798
 799         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
 800         return period;
 801 }
 802
 803 static struct device_attribute sdev_attr_queue_ramp_up_period =
 804         __ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
 805                sdev_show_queue_ramp_up_period,
 806                sdev_store_queue_ramp_up_period);
 807
 808 static ssize_t
 809 sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
 810                          const char *buf, size_t count)
 811 {
 812         struct scsi_device *sdev = to_scsi_device(dev);
 813         struct scsi_host_template *sht = sdev->host->hostt;
 814         int tag_type = 0, retval;
 815         int prev_tag_type = scsi_get_tag_type(sdev);
 816
 817         if (!sdev->tagged_supported || !sht->change_queue_type)
 818                 return -EINVAL;
 819
 820         if (strncmp(buf, "ordered", 7) == 0)
 821                 tag_type = MSG_ORDERED_TAG;
 822         else if (strncmp(buf, "simple", 6) == 0)
 823                 tag_type = MSG_SIMPLE_TAG;
 824         else if (strncmp(buf, "none", 4) != 0)
 825                 return -EINVAL;
 826
 827         if (tag_type == prev_tag_type)
 828                 return count;
 829
 830         retval = sht->change_queue_type(sdev, tag_type);
 831         if (retval < 0)
 832                 return retval;
 833
 834         return count;
 835 }
 836
 837 static int scsi_target_add(struct scsi_target *starget)
 838 {
 839         int error;
 840
 841         if (starget->state != STARGET_CREATED)
 842                 return 0;
 843
 844         error = device_add(&starget->dev);
 845         if (error) {
 846                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
 847                 return error;
 848         }
 849         transport_add_device(&starget->dev);
 850         starget->state = STARGET_RUNNING;
 851
 852         pm_runtime_set_active(&starget->dev);
 853         pm_runtime_enable(&starget->dev);
 854         device_enable_async_suspend(&starget->dev);
 855
 856         return 0;
 857 }
 858
 859 static struct device_attribute sdev_attr_queue_type_rw =
 860         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 861                sdev_store_queue_type_rw);
 862
 863 /**
 864  * scsi_sysfs_add_sdev - add scsi device to sysfs
 865  * @sdev:       scsi_device to add
 866  *
 867  * Return value:
 868  *      0 on Success / non-zero on Failure
 869  **/
 870 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 871 {
 872         int error, i;
 873         struct request_queue *rq = sdev->request_queue;
 874         struct scsi_target *starget = sdev->sdev_target;
 875
 876         error = scsi_device_set_state(sdev, SDEV_RUNNING);
 877         if (error)
 878                 return error;
 879
 880         error = scsi_target_add(starget);
 881         if (error)
 882                 return error;
 883
 884         transport_configure_device(&starget->dev);
 885
 886         device_enable_async_suspend(&sdev->sdev_gendev);
 887         scsi_autopm_get_target(starget);
 888         pm_runtime_set_active(&sdev->sdev_gendev);
 889         pm_runtime_forbid(&sdev->sdev_gendev);
 890         pm_runtime_enable(&sdev->sdev_gendev);
 891         scsi_autopm_put_target(starget);
 892
 893         /* The following call will keep sdev active indefinitely, until
 894          * its driver does a corresponding scsi_autopm_pm_device().  Only
 895          * drivers supporting autosuspend will do this.
 896          */
 897         scsi_autopm_get_device(sdev);
 898
 899         error = device_add(&sdev->sdev_gendev);
 900         if (error) {
 901                 sdev_printk(KERN_INFO, sdev,
 902                                 "failed to add device: %d\n", error);
 903                 return error;
 904         }
 905         device_enable_async_suspend(&sdev->sdev_dev);
 906         error = device_add(&sdev->sdev_dev);
 907         if (error) {
 908                 sdev_printk(KERN_INFO, sdev,
 909                                 "failed to add class device: %d\n", error);
 910                 device_del(&sdev->sdev_gendev);
 911                 return error;
 912         }
 913         transport_add_device(&sdev->sdev_gendev);
 914         sdev->is_visible = 1;
 915
 916         /* create queue files, which may be writable, depending on the host */
 917         if (sdev->host->hostt->change_queue_depth) {
 918                 error = device_create_file(&sdev->sdev_gendev,
 919                                            &sdev_attr_queue_depth_rw);
 920                 error = device_create_file(&sdev->sdev_gendev,
 921                                            &sdev_attr_queue_ramp_up_period);
 922         }
 923         else
 924                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
 925         if (error)
 926                 return error;
 927
 928         if (sdev->host->hostt->change_queue_type)
 929                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
 930         else
 931                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
 932         if (error)
 933                 return error;
 934
 935         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
 936
 937         if (error)
 938                 /* we're treating error on bsg register as non-fatal,
 939                  * so pretend nothing went wrong */
 940                 sdev_printk(KERN_INFO, sdev,
 941                             "Failed to register bsg queue, errno=%d\n", error);
 942
 943         /* add additional host specific attributes */
 944         if (sdev->host->hostt->sdev_attrs) {
 945                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
 946                         error = device_create_file(&sdev->sdev_gendev,
 947                                         sdev->host->hostt->sdev_attrs[i]);
 948                         if (error)
 949                                 return error;
 950                 }
 951         }
 952
 953         return error;
 954 }
 955
 956 void __scsi_remove_device(struct scsi_device *sdev)
 957 {
 958         struct device *dev = &sdev->sdev_gendev;
 959
 960         if (sdev->is_visible) {
 961                 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
 962                         return;
 963
 964                 bsg_unregister_queue(sdev->request_queue);
 965                 device_unregister(&sdev->sdev_dev);
 966                 transport_remove_device(dev);
 967                 device_del(dev);
 968         } else
 969                 put_device(&sdev->sdev_dev);
 970
 971         /*
 972          * Stop accepting new requests and wait until all queuecommand() and
 973          * scsi_run_queue() invocations have finished before tearing down the
 974          * device.
 975          */
 976         scsi_device_set_state(sdev, SDEV_DEL);
 977         blk_cleanup_queue(sdev->request_queue);
 978         cancel_work_sync(&sdev->requeue_work);
 979
 980         if (sdev->host->hostt->slave_destroy)
 981                 sdev->host->hostt->slave_destroy(sdev);
 982         transport_destroy_device(dev);
 983
 984         put_device(dev);
 985 }
 986
 987 /**
 988  * scsi_remove_device - unregister a device from the scsi bus
 989  * @sdev:       scsi_device to unregister
 990  **/
 991 void scsi_remove_device(struct scsi_device *sdev)
 992 {
 993         struct Scsi_Host *shost = sdev->host;
 994
 995         mutex_lock(&shost->scan_mutex);
 996         __scsi_remove_device(sdev);
 997         mutex_unlock(&shost->scan_mutex);
 998 }
 999 EXPORT_SYMBOL(scsi_remove_device);
1000
1001 static void __scsi_remove_target(struct scsi_target *starget)
1002 {
1003         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1004         unsigned long flags;
1005         struct scsi_device *sdev;
1006
1007         spin_lock_irqsave(shost->host_lock, flags);
1008  restart:
1009         list_for_each_entry(sdev, &shost->__devices, siblings) {
1010                 if (sdev->channel != starget->channel ||
1011                     sdev->id != starget->id ||
1012                     scsi_device_get(sdev))
1013                         continue;
1014                 spin_unlock_irqrestore(shost->host_lock, flags);
1015                 scsi_remove_device(sdev);
1016                 scsi_device_put(sdev);
1017                 spin_lock_irqsave(shost->host_lock, flags);
1018                 goto restart;
1019         }
1020         spin_unlock_irqrestore(shost->host_lock, flags);
1021 }
1022
1023 /**
1024  * scsi_remove_target - try to remove a target and all its devices
1025  * @dev: generic starget or parent of generic stargets to be removed
1026  *
1027  * Note: This is slightly racy.  It is possible that if the user
1028  * requests the addition of another device then the target won't be
1029  * removed.
1030  */
1031 void scsi_remove_target(struct device *dev)
1032 {
1033         struct Scsi_Host *shost = dev_to_shost(dev->parent);
1034         struct scsi_target *starget, *found;
1035         unsigned long flags;
1036
1037  restart:
1038         found = NULL;
1039         spin_lock_irqsave(shost->host_lock, flags);
1040         list_for_each_entry(starget, &shost->__targets, siblings) {
1041                 if (starget->state == STARGET_DEL)
1042                         continue;
1043                 if (starget->dev.parent == dev || &starget->dev == dev) {
1044                         found = starget;
1045                         found->reap_ref++;
1046                         break;
1047                 }
1048         }
1049         spin_unlock_irqrestore(shost->host_lock, flags);
1050
1051         if (found) {
1052                 __scsi_remove_target(found);
1053                 scsi_target_reap(found);
1054                 /* in the case where @dev has multiple starget children,
1055                  * continue removing.
1056                  *
1057                  * FIXME: does such a case exist?
1058                  */
1059                 goto restart;
1060         }
1061 }
1062 EXPORT_SYMBOL(scsi_remove_target);
1063
1064 int scsi_register_driver(struct device_driver *drv)
1065 {
1066         drv->bus = &scsi_bus_type;
1067
1068         return driver_register(drv);
1069 }
1070 EXPORT_SYMBOL(scsi_register_driver);
1071
1072 int scsi_register_interface(struct class_interface *intf)
1073 {
1074         intf->class = &sdev_class;
1075
1076         return class_interface_register(intf);
1077 }
1078 EXPORT_SYMBOL(scsi_register_interface);
1079
1080 /**
1081  * scsi_sysfs_add_host - add scsi host to subsystem
1082  * @shost:     scsi host struct to add to subsystem
1083  **/
1084 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1085 {
1086         int error, i;
1087
1088         /* add host specific attributes */
1089         if (shost->hostt->shost_attrs) {
1090                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1091                         error = device_create_file(&shost->shost_dev,
1092                                         shost->hostt->shost_attrs[i]);
1093                         if (error)
1094                                 return error;
1095                 }
1096         }
1097
1098         transport_register_device(&shost->shost_gendev);
1099         transport_configure_device(&shost->shost_gendev);
1100         return 0;
1101 }
1102
1103 static struct device_type scsi_dev_type = {
1104         .name =         "scsi_device",
1105         .release =      scsi_device_dev_release,
1106         .groups =       scsi_sdev_attr_groups,
1107 };
1108
1109 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1110 {
1111         unsigned long flags;
1112         struct Scsi_Host *shost = sdev->host;
1113         struct scsi_target  *starget = sdev->sdev_target;
1114
1115         device_initialize(&sdev->sdev_gendev);
1116         sdev->sdev_gendev.bus = &scsi_bus_type;
1117         sdev->sdev_gendev.type = &scsi_dev_type;
1118         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%d",
1119                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1120
1121         device_initialize(&sdev->sdev_dev);
1122         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1123         sdev->sdev_dev.class = &sdev_class;
1124         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%d",
1125                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1126         sdev->scsi_level = starget->scsi_level;
1127         transport_setup_device(&sdev->sdev_gendev);
1128         spin_lock_irqsave(shost->host_lock, flags);
1129         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1130         list_add_tail(&sdev->siblings, &shost->__devices);
1131         spin_unlock_irqrestore(shost->host_lock, flags);
1132 }
1133
1134 int scsi_is_sdev_device(const struct device *dev)
1135 {
1136         return dev->type == &scsi_dev_type;
1137 }
1138 EXPORT_SYMBOL(scsi_is_sdev_device);
1139
1140 /* A blank transport template that is used in drivers that don't
1141  * yet implement Transport Attributes */
1142 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };