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(const char *str)
 251 {
 252         if (sysfs_streq(str, "adapter"))
 253                 return SCSI_ADAPTER_RESET;
 254         else if (sysfs_streq(str, "firmware"))
 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         int type;
 268
 269         type = check_reset_type(buf);
 270         if (!type)
 271                 goto exit_store_host_reset;
 272
 273         if (sht->host_reset)
 274                 ret = sht->host_reset(shost, type);
 275
 276 exit_store_host_reset:
 277         if (ret == 0)
 278                 ret = count;
 279         return ret;
 280 }
 281
 282 static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
 283
 284 shost_rd_attr(unique_id, "%u\n");
 285 shost_rd_attr(host_busy, "%hu\n");
 286 shost_rd_attr(cmd_per_lun, "%hd\n");
 287 shost_rd_attr(can_queue, "%hd\n");
 288 shost_rd_attr(sg_tablesize, "%hu\n");
 289 shost_rd_attr(sg_prot_tablesize, "%hu\n");
 290 shost_rd_attr(unchecked_isa_dma, "%d\n");
 291 shost_rd_attr(prot_capabilities, "%u\n");
 292 shost_rd_attr(prot_guard_type, "%hd\n");
 293 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
 294
 295 static struct attribute *scsi_sysfs_shost_attrs[] = {
 296         &dev_attr_unique_id.attr,
 297         &dev_attr_host_busy.attr,
 298         &dev_attr_cmd_per_lun.attr,
 299         &dev_attr_can_queue.attr,
 300         &dev_attr_sg_tablesize.attr,
 301         &dev_attr_sg_prot_tablesize.attr,
 302         &dev_attr_unchecked_isa_dma.attr,
 303         &dev_attr_proc_name.attr,
 304         &dev_attr_scan.attr,
 305         &dev_attr_hstate.attr,
 306         &dev_attr_supported_mode.attr,
 307         &dev_attr_active_mode.attr,
 308         &dev_attr_prot_capabilities.attr,
 309         &dev_attr_prot_guard_type.attr,
 310         &dev_attr_host_reset.attr,
 311         NULL
 312 };
 313
 314 struct attribute_group scsi_shost_attr_group = {
 315         .attrs =        scsi_sysfs_shost_attrs,
 316 };
 317
 318 const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
 319         &scsi_shost_attr_group,
 320         NULL
 321 };
 322
 323 static void scsi_device_cls_release(struct device *class_dev)
 324 {
 325         struct scsi_device *sdev;
 326
 327         sdev = class_to_sdev(class_dev);
 328         put_device(&sdev->sdev_gendev);
 329 }
 330
 331 static void scsi_device_dev_release_usercontext(struct work_struct *work)
 332 {
 333         struct scsi_device *sdev;
 334         struct device *parent;
 335         struct scsi_target *starget;
 336         struct list_head *this, *tmp;
 337         unsigned long flags;
 338
 339         sdev = container_of(work, struct scsi_device, ew.work);
 340
 341         parent = sdev->sdev_gendev.parent;
 342         starget = to_scsi_target(parent);
 343
 344         spin_lock_irqsave(sdev->host->host_lock, flags);
 345         starget->reap_ref++;
 346         list_del(&sdev->siblings);
 347         list_del(&sdev->same_target_siblings);
 348         list_del(&sdev->starved_entry);
 349         spin_unlock_irqrestore(sdev->host->host_lock, flags);
 350
 351         cancel_work_sync(&sdev->event_work);
 352
 353         list_for_each_safe(this, tmp, &sdev->event_list) {
 354                 struct scsi_event *evt;
 355
 356                 evt = list_entry(this, struct scsi_event, node);
 357                 list_del(&evt->node);
 358                 kfree(evt);
 359         }
 360
 361         blk_put_queue(sdev->request_queue);
 362         /* NULL queue means the device can't be used */
 363         sdev->request_queue = NULL;
 364
 365         scsi_target_reap(scsi_target(sdev));
 366
 367         kfree(sdev->inquiry);
 368         kfree(sdev);
 369
 370         if (parent)
 371                 put_device(parent);
 372 }
 373
 374 static void scsi_device_dev_release(struct device *dev)
 375 {
 376         struct scsi_device *sdp = to_scsi_device(dev);
 377         execute_in_process_context(scsi_device_dev_release_usercontext,
 378                                    &sdp->ew);
 379 }
 380
 381 static struct class sdev_class = {
 382         .name           = "scsi_device",
 383         .dev_release    = scsi_device_cls_release,
 384 };
 385
 386 /* all probing is done in the individual ->probe routines */
 387 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 388 {
 389         struct scsi_device *sdp;
 390
 391         if (dev->type != &scsi_dev_type)
 392                 return 0;
 393
 394         sdp = to_scsi_device(dev);
 395         if (sdp->no_uld_attach)
 396                 return 0;
 397         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 398 }
 399
 400 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 401 {
 402         struct scsi_device *sdev;
 403
 404         if (dev->type != &scsi_dev_type)
 405                 return 0;
 406
 407         sdev = to_scsi_device(dev);
 408
 409         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 410         return 0;
 411 }
 412
 413 struct bus_type scsi_bus_type = {
 414         .name           = "scsi",
 415         .match          = scsi_bus_match,
 416         .uevent         = scsi_bus_uevent,
 417 #ifdef CONFIG_PM
 418         .pm             = &scsi_bus_pm_ops,
 419 #endif
 420 };
 421 EXPORT_SYMBOL_GPL(scsi_bus_type);
 422
 423 int scsi_sysfs_register(void)
 424 {
 425         int error;
 426
 427         error = bus_register(&scsi_bus_type);
 428         if (!error) {
 429                 error = class_register(&sdev_class);
 430                 if (error)
 431                         bus_unregister(&scsi_bus_type);
 432         }
 433
 434         return error;
 435 }
 436
 437 void scsi_sysfs_unregister(void)
 438 {
 439         class_unregister(&sdev_class);
 440         bus_unregister(&scsi_bus_type);
 441 }
 442
 443 /*
 444  * sdev_show_function: macro to create an attr function that can be used to
 445  * show a non-bit field.
 446  */
 447 #define sdev_show_function(field, format_string)                                \
 448 static ssize_t                                                          \
 449 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 450                    char *buf)                                           \
 451 {                                                                       \
 452         struct scsi_device *sdev;                                       \
 453         sdev = to_scsi_device(dev);                                     \
 454         return snprintf (buf, 20, format_string, sdev->field);          \
 455 }                                                                       \
 456
 457 /*
 458  * sdev_rd_attr: macro to create a function and attribute variable for a
 459  * read only field.
 460  */
 461 #define sdev_rd_attr(field, format_string)                              \
 462         sdev_show_function(field, format_string)                        \
 463 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 464
 465
 466 /*
 467  * sdev_rw_attr: create a function and attribute variable for a
 468  * read/write field.
 469  */
 470 #define sdev_rw_attr(field, format_string)                              \
 471         sdev_show_function(field, format_string)                                \
 472                                                                         \
 473 static ssize_t                                                          \
 474 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 475                     const char *buf, size_t count)                      \
 476 {                                                                       \
 477         struct scsi_device *sdev;                                       \
 478         sdev = to_scsi_device(dev);                                     \
 479         sscanf (buf, format_string, &sdev->field);                      \
 480         return count;                                                   \
 481 }                                                                       \
 482 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 483
 484 /* Currently we don't export bit fields, but we might in future,
 485  * so leave this code in */
 486 #if 0
 487 /*
 488  * sdev_rd_attr: create a function and attribute variable for a
 489  * read/write bit field.
 490  */
 491 #define sdev_rw_attr_bit(field)                                         \
 492         sdev_show_function(field, "%d\n")                                       \
 493                                                                         \
 494 static ssize_t                                                          \
 495 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 496                     const char *buf, size_t count)                      \
 497 {                                                                       \
 498         int ret;                                                        \
 499         struct scsi_device *sdev;                                       \
 500         ret = scsi_sdev_check_buf_bit(buf);                             \
 501         if (ret >= 0)   {                                               \
 502                 sdev = to_scsi_device(dev);                             \
 503                 sdev->field = ret;                                      \
 504                 ret = count;                                            \
 505         }                                                               \
 506         return ret;                                                     \
 507 }                                                                       \
 508 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 509
 510 /*
 511  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 512  * else return -EINVAL.
 513  */
 514 static int scsi_sdev_check_buf_bit(const char *buf)
 515 {
 516         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 517                 if (buf[0] == '1')
 518                         return 1;
 519                 else if (buf[0] == '0')
 520                         return 0;
 521                 else
 522                         return -EINVAL;
 523         } else
 524                 return -EINVAL;
 525 }
 526 #endif
 527 /*
 528  * Create the actual show/store functions and data structures.
 529  */
 530 sdev_rd_attr (device_blocked, "%d\n");
 531 sdev_rd_attr (queue_depth, "%d\n");
 532 sdev_rd_attr (type, "%d\n");
 533 sdev_rd_attr (scsi_level, "%d\n");
 534 sdev_rd_attr (vendor, "%.8s\n");
 535 sdev_rd_attr (model, "%.16s\n");
 536 sdev_rd_attr (rev, "%.4s\n");
 537
 538 /*
 539  * TODO: can we make these symlinks to the block layer ones?
 540  */
 541 static ssize_t
 542 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 543 {
 544         struct scsi_device *sdev;
 545         sdev = to_scsi_device(dev);
 546         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
 547 }
 548
 549 static ssize_t
 550 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 551                     const char *buf, size_t count)
 552 {
 553         struct scsi_device *sdev;
 554         int timeout;
 555         sdev = to_scsi_device(dev);
 556         sscanf (buf, "%d\n", &timeout);
 557         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
 558         return count;
 559 }
 560 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 561
 562 static ssize_t
 563 sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 564 {
 565         struct scsi_device *sdev;
 566         sdev = to_scsi_device(dev);
 567         return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
 568 }
 569
 570 static ssize_t
 571 sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
 572                     const char *buf, size_t count)
 573 {
 574         struct scsi_device *sdev;
 575         unsigned int eh_timeout;
 576         int err;
 577
 578         if (!capable(CAP_SYS_ADMIN))
 579                 return -EACCES;
 580
 581         sdev = to_scsi_device(dev);
 582         err = kstrtouint(buf, 10, &eh_timeout);
 583         if (err)
 584                 return err;
 585         sdev->eh_timeout = eh_timeout * HZ;
 586
 587         return count;
 588 }
 589 static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
 590
 591 static ssize_t
 592 store_rescan_field (struct device *dev, struct device_attribute *attr,
 593                     const char *buf, size_t count)
 594 {
 595         scsi_rescan_device(dev);
 596         return count;
 597 }
 598 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 599
 600 static void sdev_store_delete_callback(struct device *dev)
 601 {
 602         scsi_remove_device(to_scsi_device(dev));
 603 }
 604
 605 static ssize_t
 606 sdev_store_delete(struct device *dev, struct device_attribute *attr,
 607                   const char *buf, size_t count)
 608 {
 609         int rc;
 610
 611         /* An attribute cannot be unregistered by one of its own methods,
 612          * so we have to use this roundabout approach.
 613          */
 614         rc = device_schedule_callback(dev, sdev_store_delete_callback);
 615         if (rc)
 616                 count = rc;
 617         return count;
 618 };
 619 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 620
 621 static ssize_t
 622 store_state_field(struct device *dev, struct device_attribute *attr,
 623                   const char *buf, size_t count)
 624 {
 625         int i;
 626         struct scsi_device *sdev = to_scsi_device(dev);
 627         enum scsi_device_state state = 0;
 628
 629         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 630                 const int len = strlen(sdev_states[i].name);
 631                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 632                    buf[len] == '\n') {
 633                         state = sdev_states[i].value;
 634                         break;
 635                 }
 636         }
 637         if (!state)
 638                 return -EINVAL;
 639
 640         if (scsi_device_set_state(sdev, state))
 641                 return -EINVAL;
 642         return count;
 643 }
 644
 645 static ssize_t
 646 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 647 {
 648         struct scsi_device *sdev = to_scsi_device(dev);
 649         const char *name = scsi_device_state_name(sdev->sdev_state);
 650
 651         if (!name)
 652                 return -EINVAL;
 653
 654         return snprintf(buf, 20, "%s\n", name);
 655 }
 656
 657 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 658
 659 static ssize_t
 660 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 661                       char *buf)
 662 {
 663         struct scsi_device *sdev = to_scsi_device(dev);
 664         const char *name = "none";
 665
 666         if (sdev->ordered_tags)
 667                 name = "ordered";
 668         else if (sdev->simple_tags)
 669                 name = "simple";
 670
 671         return snprintf(buf, 20, "%s\n", name);
 672 }
 673
 674 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
 675
 676 static ssize_t
 677 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,                              char *buf)
 678 {
 679         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 680 }
 681
 682 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 683
 684 #define show_sdev_iostat(field)                                         \
 685 static ssize_t                                                          \
 686 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 687                     char *buf)                                          \
 688 {                                                                       \
 689         struct scsi_device *sdev = to_scsi_device(dev);                 \
 690         unsigned long long count = atomic_read(&sdev->field);           \
 691         return snprintf(buf, 20, "0x%llx\n", count);                    \
 692 }                                                                       \
 693 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 694
 695 show_sdev_iostat(iorequest_cnt);
 696 show_sdev_iostat(iodone_cnt);
 697 show_sdev_iostat(ioerr_cnt);
 698
 699 static ssize_t
 700 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 701 {
 702         struct scsi_device *sdev;
 703         sdev = to_scsi_device(dev);
 704         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 705 }
 706 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 707
 708 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 709 static ssize_t                                                          \
 710 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 711                      char *buf)                                         \
 712 {                                                                       \
 713         struct scsi_device *sdev = to_scsi_device(dev);                 \
 714         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 715         return snprintf(buf, 20, "%d\n", val);                          \
 716 }
 717
 718 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 719 static ssize_t                                                          \
 720 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 721                       const char *buf, size_t count)                    \
 722 {                                                                       \
 723         struct scsi_device *sdev = to_scsi_device(dev);                 \
 724         int val = simple_strtoul(buf, NULL, 0);                         \
 725         if (val == 0)                                                   \
 726                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 727         else if (val == 1)                                              \
 728                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 729         else                                                            \
 730                 return -EINVAL;                                         \
 731         return count;                                                   \
 732 }
 733
 734 #define DECLARE_EVT(name, Cap_name)                                     \
 735         DECLARE_EVT_SHOW(name, Cap_name)                                \
 736         DECLARE_EVT_STORE(name, Cap_name)                               \
 737         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 738                            sdev_store_evt_##name);
 739 #define REF_EVT(name) &dev_attr_evt_##name.attr
 740
 741 DECLARE_EVT(media_change, MEDIA_CHANGE)
 742 DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
 743 DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
 744 DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
 745 DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
 746 DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
 747
 748 /* Default template for device attributes.  May NOT be modified */
 749 static struct attribute *scsi_sdev_attrs[] = {
 750         &dev_attr_device_blocked.attr,
 751         &dev_attr_type.attr,
 752         &dev_attr_scsi_level.attr,
 753         &dev_attr_vendor.attr,
 754         &dev_attr_model.attr,
 755         &dev_attr_rev.attr,
 756         &dev_attr_rescan.attr,
 757         &dev_attr_delete.attr,
 758         &dev_attr_state.attr,
 759         &dev_attr_timeout.attr,
 760         &dev_attr_eh_timeout.attr,
 761         &dev_attr_iocounterbits.attr,
 762         &dev_attr_iorequest_cnt.attr,
 763         &dev_attr_iodone_cnt.attr,
 764         &dev_attr_ioerr_cnt.attr,
 765         &dev_attr_modalias.attr,
 766         REF_EVT(media_change),
 767         REF_EVT(inquiry_change_reported),
 768         REF_EVT(capacity_change_reported),
 769         REF_EVT(soft_threshold_reached),
 770         REF_EVT(mode_parameter_change_reported),
 771         REF_EVT(lun_change_reported),
 772         NULL
 773 };
 774
 775 static struct attribute_group scsi_sdev_attr_group = {
 776         .attrs =        scsi_sdev_attrs,
 777 };
 778
 779 static const struct attribute_group *scsi_sdev_attr_groups[] = {
 780         &scsi_sdev_attr_group,
 781         NULL
 782 };
 783
 784 static ssize_t
 785 sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
 786                           const char *buf, size_t count)
 787 {
 788         int depth, retval;
 789         struct scsi_device *sdev = to_scsi_device(dev);
 790         struct scsi_host_template *sht = sdev->host->hostt;
 791
 792         if (!sht->change_queue_depth)
 793                 return -EINVAL;
 794
 795         depth = simple_strtoul(buf, NULL, 0);
 796
 797         if (depth < 1)
 798                 return -EINVAL;
 799
 800         retval = sht->change_queue_depth(sdev, depth,
 801                                          SCSI_QDEPTH_DEFAULT);
 802         if (retval < 0)
 803                 return retval;
 804
 805         sdev->max_queue_depth = sdev->queue_depth;
 806
 807         return count;
 808 }
 809
 810 static struct device_attribute sdev_attr_queue_depth_rw =
 811         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 812                sdev_store_queue_depth_rw);
 813
 814 static ssize_t
 815 sdev_show_queue_ramp_up_period(struct device *dev,
 816                                struct device_attribute *attr,
 817                                char *buf)
 818 {
 819         struct scsi_device *sdev;
 820         sdev = to_scsi_device(dev);
 821         return snprintf(buf, 20, "%u\n",
 822                         jiffies_to_msecs(sdev->queue_ramp_up_period));
 823 }
 824
 825 static ssize_t
 826 sdev_store_queue_ramp_up_period(struct device *dev,
 827                                 struct device_attribute *attr,
 828                                 const char *buf, size_t count)
 829 {
 830         struct scsi_device *sdev = to_scsi_device(dev);
 831         unsigned long period;
 832
 833         if (strict_strtoul(buf, 10, &period))
 834                 return -EINVAL;
 835
 836         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
 837         return period;
 838 }
 839
 840 static struct device_attribute sdev_attr_queue_ramp_up_period =
 841         __ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
 842                sdev_show_queue_ramp_up_period,
 843                sdev_store_queue_ramp_up_period);
 844
 845 static ssize_t
 846 sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
 847                          const char *buf, size_t count)
 848 {
 849         struct scsi_device *sdev = to_scsi_device(dev);
 850         struct scsi_host_template *sht = sdev->host->hostt;
 851         int tag_type = 0, retval;
 852         int prev_tag_type = scsi_get_tag_type(sdev);
 853
 854         if (!sdev->tagged_supported || !sht->change_queue_type)
 855                 return -EINVAL;
 856
 857         if (strncmp(buf, "ordered", 7) == 0)
 858                 tag_type = MSG_ORDERED_TAG;
 859         else if (strncmp(buf, "simple", 6) == 0)
 860                 tag_type = MSG_SIMPLE_TAG;
 861         else if (strncmp(buf, "none", 4) != 0)
 862                 return -EINVAL;
 863
 864         if (tag_type == prev_tag_type)
 865                 return count;
 866
 867         retval = sht->change_queue_type(sdev, tag_type);
 868         if (retval < 0)
 869                 return retval;
 870
 871         return count;
 872 }
 873
 874 static int scsi_target_add(struct scsi_target *starget)
 875 {
 876         int error;
 877
 878         if (starget->state != STARGET_CREATED)
 879                 return 0;
 880
 881         error = device_add(&starget->dev);
 882         if (error) {
 883                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
 884                 return error;
 885         }
 886         transport_add_device(&starget->dev);
 887         starget->state = STARGET_RUNNING;
 888
 889         pm_runtime_set_active(&starget->dev);
 890         pm_runtime_enable(&starget->dev);
 891         device_enable_async_suspend(&starget->dev);
 892
 893         return 0;
 894 }
 895
 896 static struct device_attribute sdev_attr_queue_type_rw =
 897         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 898                sdev_store_queue_type_rw);
 899
 900 /**
 901  * scsi_sysfs_add_sdev - add scsi device to sysfs
 902  * @sdev:       scsi_device to add
 903  *
 904  * Return value:
 905  *      0 on Success / non-zero on Failure
 906  **/
 907 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 908 {
 909         int error, i;
 910         struct request_queue *rq = sdev->request_queue;
 911         struct scsi_target *starget = sdev->sdev_target;
 912
 913         error = scsi_device_set_state(sdev, SDEV_RUNNING);
 914         if (error)
 915                 return error;
 916
 917         error = scsi_target_add(starget);
 918         if (error)
 919                 return error;
 920
 921         transport_configure_device(&starget->dev);
 922
 923         device_enable_async_suspend(&sdev->sdev_gendev);
 924         scsi_autopm_get_target(starget);
 925         pm_runtime_set_active(&sdev->sdev_gendev);
 926         pm_runtime_forbid(&sdev->sdev_gendev);
 927         pm_runtime_enable(&sdev->sdev_gendev);
 928         scsi_autopm_put_target(starget);
 929
 930         /* The following call will keep sdev active indefinitely, until
 931          * its driver does a corresponding scsi_autopm_pm_device().  Only
 932          * drivers supporting autosuspend will do this.
 933          */
 934         scsi_autopm_get_device(sdev);
 935
 936         error = device_add(&sdev->sdev_gendev);
 937         if (error) {
 938                 sdev_printk(KERN_INFO, sdev,
 939                                 "failed to add device: %d\n", error);
 940                 return error;
 941         }
 942         device_enable_async_suspend(&sdev->sdev_dev);
 943         error = device_add(&sdev->sdev_dev);
 944         if (error) {
 945                 sdev_printk(KERN_INFO, sdev,
 946                                 "failed to add class device: %d\n", error);
 947                 device_del(&sdev->sdev_gendev);
 948                 return error;
 949         }
 950         transport_add_device(&sdev->sdev_gendev);
 951         sdev->is_visible = 1;
 952
 953         /* create queue files, which may be writable, depending on the host */
 954         if (sdev->host->hostt->change_queue_depth) {
 955                 error = device_create_file(&sdev->sdev_gendev,
 956                                            &sdev_attr_queue_depth_rw);
 957                 error = device_create_file(&sdev->sdev_gendev,
 958                                            &sdev_attr_queue_ramp_up_period);
 959         }
 960         else
 961                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
 962         if (error)
 963                 return error;
 964
 965         if (sdev->host->hostt->change_queue_type)
 966                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
 967         else
 968                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
 969         if (error)
 970                 return error;
 971
 972         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
 973
 974         if (error)
 975                 /* we're treating error on bsg register as non-fatal,
 976                  * so pretend nothing went wrong */
 977                 sdev_printk(KERN_INFO, sdev,
 978                             "Failed to register bsg queue, errno=%d\n", error);
 979
 980         /* add additional host specific attributes */
 981         if (sdev->host->hostt->sdev_attrs) {
 982                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
 983                         error = device_create_file(&sdev->sdev_gendev,
 984                                         sdev->host->hostt->sdev_attrs[i]);
 985                         if (error)
 986                                 return error;
 987                 }
 988         }
 989
 990         return error;
 991 }
 992
 993 void __scsi_remove_device(struct scsi_device *sdev)
 994 {
 995         struct device *dev = &sdev->sdev_gendev;
 996
 997         if (sdev->is_visible) {
 998                 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
 999                         return;
1000
1001                 bsg_unregister_queue(sdev->request_queue);
1002                 device_unregister(&sdev->sdev_dev);
1003                 transport_remove_device(dev);
1004                 device_del(dev);
1005         } else
1006                 put_device(&sdev->sdev_dev);
1007
1008         /*
1009          * Stop accepting new requests and wait until all queuecommand() and
1010          * scsi_run_queue() invocations have finished before tearing down the
1011          * device.
1012          */
1013         scsi_device_set_state(sdev, SDEV_DEL);
1014         blk_cleanup_queue(sdev->request_queue);
1015         cancel_work_sync(&sdev->requeue_work);
1016
1017         if (sdev->host->hostt->slave_destroy)
1018                 sdev->host->hostt->slave_destroy(sdev);
1019         transport_destroy_device(dev);
1020
1021         put_device(dev);
1022 }
1023
1024 /**
1025  * scsi_remove_device - unregister a device from the scsi bus
1026  * @sdev:       scsi_device to unregister
1027  **/
1028 void scsi_remove_device(struct scsi_device *sdev)
1029 {
1030         struct Scsi_Host *shost = sdev->host;
1031
1032         mutex_lock(&shost->scan_mutex);
1033         __scsi_remove_device(sdev);
1034         mutex_unlock(&shost->scan_mutex);
1035 }
1036 EXPORT_SYMBOL(scsi_remove_device);
1037
1038 static void __scsi_remove_target(struct scsi_target *starget)
1039 {
1040         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1041         unsigned long flags;
1042         struct scsi_device *sdev;
1043
1044         spin_lock_irqsave(shost->host_lock, flags);
1045  restart:
1046         list_for_each_entry(sdev, &shost->__devices, siblings) {
1047                 if (sdev->channel != starget->channel ||
1048                     sdev->id != starget->id ||
1049                     scsi_device_get(sdev))
1050                         continue;
1051                 spin_unlock_irqrestore(shost->host_lock, flags);
1052                 scsi_remove_device(sdev);
1053                 scsi_device_put(sdev);
1054                 spin_lock_irqsave(shost->host_lock, flags);
1055                 goto restart;
1056         }
1057         spin_unlock_irqrestore(shost->host_lock, flags);
1058 }
1059
1060 /**
1061  * scsi_remove_target - try to remove a target and all its devices
1062  * @dev: generic starget or parent of generic stargets to be removed
1063  *
1064  * Note: This is slightly racy.  It is possible that if the user
1065  * requests the addition of another device then the target won't be
1066  * removed.
1067  */
1068 void scsi_remove_target(struct device *dev)
1069 {
1070         struct Scsi_Host *shost = dev_to_shost(dev->parent);
1071         struct scsi_target *starget, *last = NULL;
1072         unsigned long flags;
1073
1074         /* remove targets being careful to lookup next entry before
1075          * deleting the last
1076          */
1077         spin_lock_irqsave(shost->host_lock, flags);
1078         list_for_each_entry(starget, &shost->__targets, siblings) {
1079                 if (starget->state == STARGET_DEL)
1080                         continue;
1081                 if (starget->dev.parent == dev || &starget->dev == dev) {
1082                         /* assuming new targets arrive at the end */
1083                         starget->reap_ref++;
1084                         spin_unlock_irqrestore(shost->host_lock, flags);
1085                         if (last)
1086                                 scsi_target_reap(last);
1087                         last = starget;
1088                         __scsi_remove_target(starget);
1089                         spin_lock_irqsave(shost->host_lock, flags);
1090                 }
1091         }
1092         spin_unlock_irqrestore(shost->host_lock, flags);
1093
1094         if (last)
1095                 scsi_target_reap(last);
1096 }
1097 EXPORT_SYMBOL(scsi_remove_target);
1098
1099 int scsi_register_driver(struct device_driver *drv)
1100 {
1101         drv->bus = &scsi_bus_type;
1102
1103         return driver_register(drv);
1104 }
1105 EXPORT_SYMBOL(scsi_register_driver);
1106
1107 int scsi_register_interface(struct class_interface *intf)
1108 {
1109         intf->class = &sdev_class;
1110
1111         return class_interface_register(intf);
1112 }
1113 EXPORT_SYMBOL(scsi_register_interface);
1114
1115 /**
1116  * scsi_sysfs_add_host - add scsi host to subsystem
1117  * @shost:     scsi host struct to add to subsystem
1118  **/
1119 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1120 {
1121         int error, i;
1122
1123         /* add host specific attributes */
1124         if (shost->hostt->shost_attrs) {
1125                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1126                         error = device_create_file(&shost->shost_dev,
1127                                         shost->hostt->shost_attrs[i]);
1128                         if (error)
1129                                 return error;
1130                 }
1131         }
1132
1133         transport_register_device(&shost->shost_gendev);
1134         transport_configure_device(&shost->shost_gendev);
1135         return 0;
1136 }
1137
1138 static struct device_type scsi_dev_type = {
1139         .name =         "scsi_device",
1140         .release =      scsi_device_dev_release,
1141         .groups =       scsi_sdev_attr_groups,
1142 };
1143
1144 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1145 {
1146         unsigned long flags;
1147         struct Scsi_Host *shost = sdev->host;
1148         struct scsi_target  *starget = sdev->sdev_target;
1149
1150         device_initialize(&sdev->sdev_gendev);
1151         sdev->sdev_gendev.bus = &scsi_bus_type;
1152         sdev->sdev_gendev.type = &scsi_dev_type;
1153         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%d",
1154                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1155
1156         device_initialize(&sdev->sdev_dev);
1157         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1158         sdev->sdev_dev.class = &sdev_class;
1159         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%d",
1160                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1161         sdev->scsi_level = starget->scsi_level;
1162         transport_setup_device(&sdev->sdev_gendev);
1163         spin_lock_irqsave(shost->host_lock, flags);
1164         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1165         list_add_tail(&sdev->siblings, &shost->__devices);
1166         spin_unlock_irqrestore(shost->host_lock, flags);
1167 }
1168
1169 int scsi_is_sdev_device(const struct device *dev)
1170 {
1171         return dev->type == &scsi_dev_type;
1172 }
1173 EXPORT_SYMBOL(scsi_is_sdev_device);
1174
1175 /* A blank transport template that is used in drivers that don't
1176  * yet implement Transport Attributes */
1177 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };