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