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/init.h>
  11 #include <linux/blkdev.h>
  12 #include <linux/device.h>
  13
  14 #include <scsi/scsi.h>
  15 #include <scsi/scsi_device.h>
  16 #include <scsi/scsi_host.h>
  17 #include <scsi/scsi_tcq.h>
  18 #include <scsi/scsi_transport.h>
  19 #include <scsi/scsi_driver.h>
  20
  21 #include "scsi_priv.h"
  22 #include "scsi_logging.h"
  23
  24 static const struct {
  25         enum scsi_device_state  value;
  26         char                    *name;
  27 } sdev_states[] = {
  28         { SDEV_CREATED, "created" },
  29         { SDEV_RUNNING, "running" },
  30         { SDEV_CANCEL, "cancel" },
  31         { SDEV_DEL, "deleted" },
  32         { SDEV_QUIESCE, "quiesce" },
  33         { SDEV_OFFLINE, "offline" },
  34         { SDEV_BLOCK,   "blocked" },
  35 };
  36
  37 const char *scsi_device_state_name(enum scsi_device_state state)
  38 {
  39         int i;
  40         char *name = NULL;
  41
  42         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
  43                 if (sdev_states[i].value == state) {
  44                         name = sdev_states[i].name;
  45                         break;
  46                 }
  47         }
  48         return name;
  49 }
  50
  51 static const struct {
  52         enum scsi_host_state    value;
  53         char                    *name;
  54 } shost_states[] = {
  55         { SHOST_CREATED, "created" },
  56         { SHOST_RUNNING, "running" },
  57         { SHOST_CANCEL, "cancel" },
  58         { SHOST_DEL, "deleted" },
  59         { SHOST_RECOVERY, "recovery" },
  60         { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
  61         { SHOST_DEL_RECOVERY, "deleted/recovery", },
  62 };
  63 const char *scsi_host_state_name(enum scsi_host_state state)
  64 {
  65         int i;
  66         char *name = NULL;
  67
  68         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
  69                 if (shost_states[i].value == state) {
  70                         name = shost_states[i].name;
  71                         break;
  72                 }
  73         }
  74         return name;
  75 }
  76
  77 static int check_set(unsigned int *val, char *src)
  78 {
  79         char *last;
  80
  81         if (strncmp(src, "-", 20) == 0) {
  82                 *val = SCAN_WILD_CARD;
  83         } else {
  84                 /*
  85                  * Doesn't check for int overflow
  86                  */
  87                 *val = simple_strtoul(src, &last, 0);
  88                 if (*last != '\0')
  89                         return 1;
  90         }
  91         return 0;
  92 }
  93
  94 static int scsi_scan(struct Scsi_Host *shost, const char *str)
  95 {
  96         char s1[15], s2[15], s3[15], junk;
  97         unsigned int channel, id, lun;
  98         int res;
  99
 100         res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk);
 101         if (res != 3)
 102                 return -EINVAL;
 103         if (check_set(&channel, s1))
 104                 return -EINVAL;
 105         if (check_set(&id, s2))
 106                 return -EINVAL;
 107         if (check_set(&lun, s3))
 108                 return -EINVAL;
 109         if (shost->transportt->user_scan)
 110                 res = shost->transportt->user_scan(shost, channel, id, lun);
 111         else
 112                 res = scsi_scan_host_selected(shost, channel, id, lun, 1);
 113         return res;
 114 }
 115
 116 /*
 117  * shost_show_function: macro to create an attr function that can be used to
 118  * show a non-bit field.
 119  */
 120 #define shost_show_function(name, field, format_string)                 \
 121 static ssize_t                                                          \
 122 show_##name (struct class_device *class_dev, char *buf)                 \
 123 {                                                                       \
 124         struct Scsi_Host *shost = class_to_shost(class_dev);            \
 125         return snprintf (buf, 20, format_string, shost->field);         \
 126 }
 127
 128 /*
 129  * shost_rd_attr: macro to create a function and attribute variable for a
 130  * read only field.
 131  */
 132 #define shost_rd_attr2(name, field, format_string)                      \
 133         shost_show_function(name, field, format_string)                 \
 134 static CLASS_DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
 135
 136 #define shost_rd_attr(field, format_string) \
 137 shost_rd_attr2(field, field, format_string)
 138
 139 /*
 140  * Create the actual show/store functions and data structures.
 141  */
 142
 143 static ssize_t store_scan(struct class_device *class_dev, const char *buf,
 144                           size_t count)
 145 {
 146         struct Scsi_Host *shost = class_to_shost(class_dev);
 147         int res;
 148
 149         res = scsi_scan(shost, buf);
 150         if (res == 0)
 151                 res = count;
 152         return res;
 153 };
 154 static CLASS_DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
 155
 156 static ssize_t
 157 store_shost_state(struct class_device *class_dev, const char *buf, size_t count)
 158 {
 159         int i;
 160         struct Scsi_Host *shost = class_to_shost(class_dev);
 161         enum scsi_host_state state = 0;
 162
 163         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
 164                 const int len = strlen(shost_states[i].name);
 165                 if (strncmp(shost_states[i].name, buf, len) == 0 &&
 166                    buf[len] == '\n') {
 167                         state = shost_states[i].value;
 168                         break;
 169                 }
 170         }
 171         if (!state)
 172                 return -EINVAL;
 173
 174         if (scsi_host_set_state(shost, state))
 175                 return -EINVAL;
 176         return count;
 177 }
 178
 179 static ssize_t
 180 show_shost_state(struct class_device *class_dev, char *buf)
 181 {
 182         struct Scsi_Host *shost = class_to_shost(class_dev);
 183         const char *name = scsi_host_state_name(shost->shost_state);
 184
 185         if (!name)
 186                 return -EINVAL;
 187
 188         return snprintf(buf, 20, "%s\n", name);
 189 }
 190
 191 static CLASS_DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
 192
 193 static ssize_t
 194 show_shost_mode(unsigned int mode, char *buf)
 195 {
 196         ssize_t len = 0;
 197
 198         if (mode & MODE_INITIATOR)
 199                 len = sprintf(buf, "%s", "Initiator");
 200
 201         if (mode & MODE_TARGET)
 202                 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
 203
 204         len += sprintf(buf + len, "\n");
 205
 206         return len;
 207 }
 208
 209 static ssize_t show_shost_supported_mode(struct class_device *class_dev, char *buf)
 210 {
 211         struct Scsi_Host *shost = class_to_shost(class_dev);
 212         unsigned int supported_mode = shost->hostt->supported_mode;
 213
 214         if (supported_mode == MODE_UNKNOWN)
 215                 /* by default this should be initiator */
 216                 supported_mode = MODE_INITIATOR;
 217
 218         return show_shost_mode(supported_mode, buf);
 219 }
 220
 221 static CLASS_DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
 222
 223 static ssize_t show_shost_active_mode(struct class_device *class_dev, char *buf)
 224 {
 225         struct Scsi_Host *shost = class_to_shost(class_dev);
 226
 227         if (shost->active_mode == MODE_UNKNOWN)
 228                 return snprintf(buf, 20, "unknown\n");
 229         else
 230                 return show_shost_mode(shost->active_mode, buf);
 231 }
 232
 233 static CLASS_DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
 234
 235 shost_rd_attr(unique_id, "%u\n");
 236 shost_rd_attr(host_busy, "%hu\n");
 237 shost_rd_attr(cmd_per_lun, "%hd\n");
 238 shost_rd_attr(can_queue, "%hd\n");
 239 shost_rd_attr(sg_tablesize, "%hu\n");
 240 shost_rd_attr(unchecked_isa_dma, "%d\n");
 241 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
 242
 243 static struct class_device_attribute *scsi_sysfs_shost_attrs[] = {
 244         &class_device_attr_unique_id,
 245         &class_device_attr_host_busy,
 246         &class_device_attr_cmd_per_lun,
 247         &class_device_attr_can_queue,
 248         &class_device_attr_sg_tablesize,
 249         &class_device_attr_unchecked_isa_dma,
 250         &class_device_attr_proc_name,
 251         &class_device_attr_scan,
 252         &class_device_attr_state,
 253         &class_device_attr_supported_mode,
 254         &class_device_attr_active_mode,
 255         NULL
 256 };
 257
 258 static void scsi_device_cls_release(struct class_device *class_dev)
 259 {
 260         struct scsi_device *sdev;
 261
 262         sdev = class_to_sdev(class_dev);
 263         put_device(&sdev->sdev_gendev);
 264 }
 265
 266 static void scsi_device_dev_release_usercontext(struct work_struct *work)
 267 {
 268         struct scsi_device *sdev;
 269         struct device *parent;
 270         struct scsi_target *starget;
 271         struct list_head *this, *tmp;
 272         unsigned long flags;
 273
 274         sdev = container_of(work, struct scsi_device, ew.work);
 275
 276         parent = sdev->sdev_gendev.parent;
 277         starget = to_scsi_target(parent);
 278
 279         spin_lock_irqsave(sdev->host->host_lock, flags);
 280         starget->reap_ref++;
 281         list_del(&sdev->siblings);
 282         list_del(&sdev->same_target_siblings);
 283         list_del(&sdev->starved_entry);
 284         spin_unlock_irqrestore(sdev->host->host_lock, flags);
 285
 286         cancel_work_sync(&sdev->event_work);
 287
 288         list_for_each_safe(this, tmp, &sdev->event_list) {
 289                 struct scsi_event *evt;
 290
 291                 evt = list_entry(this, struct scsi_event, node);
 292                 list_del(&evt->node);
 293                 kfree(evt);
 294         }
 295
 296         if (sdev->request_queue) {
 297                 sdev->request_queue->queuedata = NULL;
 298                 /* user context needed to free queue */
 299                 scsi_free_queue(sdev->request_queue);
 300                 /* temporary expedient, try to catch use of queue lock
 301                  * after free of sdev */
 302                 sdev->request_queue = NULL;
 303         }
 304
 305         scsi_target_reap(scsi_target(sdev));
 306
 307         kfree(sdev->inquiry);
 308         kfree(sdev);
 309
 310         if (parent)
 311                 put_device(parent);
 312 }
 313
 314 static void scsi_device_dev_release(struct device *dev)
 315 {
 316         struct scsi_device *sdp = to_scsi_device(dev);
 317         execute_in_process_context(scsi_device_dev_release_usercontext,
 318                                    &sdp->ew);
 319 }
 320
 321 static struct class sdev_class = {
 322         .name           = "scsi_device",
 323         .release        = scsi_device_cls_release,
 324 };
 325
 326 /* all probing is done in the individual ->probe routines */
 327 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 328 {
 329         struct scsi_device *sdp = to_scsi_device(dev);
 330         if (sdp->no_uld_attach)
 331                 return 0;
 332         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 333 }
 334
 335 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 336 {
 337         struct scsi_device *sdev = to_scsi_device(dev);
 338
 339         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 340         return 0;
 341 }
 342
 343 static int scsi_bus_suspend(struct device * dev, pm_message_t state)
 344 {
 345         struct device_driver *drv = dev->driver;
 346         struct scsi_device *sdev = to_scsi_device(dev);
 347         int err;
 348
 349         err = scsi_device_quiesce(sdev);
 350         if (err)
 351                 return err;
 352
 353         if (drv && drv->suspend) {
 354                 err = drv->suspend(dev, state);
 355                 if (err)
 356                         return err;
 357         }
 358
 359         return 0;
 360 }
 361
 362 static int scsi_bus_resume(struct device * dev)
 363 {
 364         struct device_driver *drv = dev->driver;
 365         struct scsi_device *sdev = to_scsi_device(dev);
 366         int err = 0;
 367
 368         if (drv && drv->resume)
 369                 err = drv->resume(dev);
 370
 371         scsi_device_resume(sdev);
 372
 373         return err;
 374 }
 375
 376 struct bus_type scsi_bus_type = {
 377         .name           = "scsi",
 378         .match          = scsi_bus_match,
 379         .uevent         = scsi_bus_uevent,
 380         .suspend        = scsi_bus_suspend,
 381         .resume         = scsi_bus_resume,
 382 };
 383
 384 int scsi_sysfs_register(void)
 385 {
 386         int error;
 387
 388         error = bus_register(&scsi_bus_type);
 389         if (!error) {
 390                 error = class_register(&sdev_class);
 391                 if (error)
 392                         bus_unregister(&scsi_bus_type);
 393         }
 394
 395         return error;
 396 }
 397
 398 void scsi_sysfs_unregister(void)
 399 {
 400         class_unregister(&sdev_class);
 401         bus_unregister(&scsi_bus_type);
 402 }
 403
 404 /*
 405  * sdev_show_function: macro to create an attr function that can be used to
 406  * show a non-bit field.
 407  */
 408 #define sdev_show_function(field, format_string)                                \
 409 static ssize_t                                                          \
 410 sdev_show_##field (struct device *dev, struct device_attribute *attr, char *buf)                                \
 411 {                                                                       \
 412         struct scsi_device *sdev;                                       \
 413         sdev = to_scsi_device(dev);                                     \
 414         return snprintf (buf, 20, format_string, sdev->field);          \
 415 }                                                                       \
 416
 417 /*
 418  * sdev_rd_attr: macro to create a function and attribute variable for a
 419  * read only field.
 420  */
 421 #define sdev_rd_attr(field, format_string)                              \
 422         sdev_show_function(field, format_string)                        \
 423 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 424
 425
 426 /*
 427  * sdev_rd_attr: create a function and attribute variable for a
 428  * read/write field.
 429  */
 430 #define sdev_rw_attr(field, format_string)                              \
 431         sdev_show_function(field, format_string)                                \
 432                                                                         \
 433 static ssize_t                                                          \
 434 sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)   \
 435 {                                                                       \
 436         struct scsi_device *sdev;                                       \
 437         sdev = to_scsi_device(dev);                                     \
 438         snscanf (buf, 20, format_string, &sdev->field);                 \
 439         return count;                                                   \
 440 }                                                                       \
 441 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 442
 443 /* Currently we don't export bit fields, but we might in future,
 444  * so leave this code in */
 445 #if 0
 446 /*
 447  * sdev_rd_attr: create a function and attribute variable for a
 448  * read/write bit field.
 449  */
 450 #define sdev_rw_attr_bit(field)                                         \
 451         sdev_show_function(field, "%d\n")                                       \
 452                                                                         \
 453 static ssize_t                                                          \
 454 sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)   \
 455 {                                                                       \
 456         int ret;                                                        \
 457         struct scsi_device *sdev;                                       \
 458         ret = scsi_sdev_check_buf_bit(buf);                             \
 459         if (ret >= 0)   {                                               \
 460                 sdev = to_scsi_device(dev);                             \
 461                 sdev->field = ret;                                      \
 462                 ret = count;                                            \
 463         }                                                               \
 464         return ret;                                                     \
 465 }                                                                       \
 466 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 467
 468 /*
 469  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 470  * else return -EINVAL.
 471  */
 472 static int scsi_sdev_check_buf_bit(const char *buf)
 473 {
 474         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 475                 if (buf[0] == '1')
 476                         return 1;
 477                 else if (buf[0] == '0')
 478                         return 0;
 479                 else
 480                         return -EINVAL;
 481         } else
 482                 return -EINVAL;
 483 }
 484 #endif
 485 /*
 486  * Create the actual show/store functions and data structures.
 487  */
 488 sdev_rd_attr (device_blocked, "%d\n");
 489 sdev_rd_attr (queue_depth, "%d\n");
 490 sdev_rd_attr (type, "%d\n");
 491 sdev_rd_attr (scsi_level, "%d\n");
 492 sdev_rd_attr (vendor, "%.8s\n");
 493 sdev_rd_attr (model, "%.16s\n");
 494 sdev_rd_attr (rev, "%.4s\n");
 495
 496 static ssize_t
 497 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 498 {
 499         struct scsi_device *sdev;
 500         sdev = to_scsi_device(dev);
 501         return snprintf (buf, 20, "%d\n", sdev->timeout / HZ);
 502 }
 503
 504 static ssize_t
 505 sdev_store_timeout (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 506 {
 507         struct scsi_device *sdev;
 508         int timeout;
 509         sdev = to_scsi_device(dev);
 510         sscanf (buf, "%d\n", &timeout);
 511         sdev->timeout = timeout * HZ;
 512         return count;
 513 }
 514 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 515
 516 static ssize_t
 517 store_rescan_field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 518 {
 519         scsi_rescan_device(dev);
 520         return count;
 521 }
 522 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 523
 524 static void sdev_store_delete_callback(struct device *dev)
 525 {
 526         scsi_remove_device(to_scsi_device(dev));
 527 }
 528
 529 static ssize_t sdev_store_delete(struct device *dev, struct device_attribute *attr, const char *buf,
 530                                  size_t count)
 531 {
 532         int rc;
 533
 534         /* An attribute cannot be unregistered by one of its own methods,
 535          * so we have to use this roundabout approach.
 536          */
 537         rc = device_schedule_callback(dev, sdev_store_delete_callback);
 538         if (rc)
 539                 count = rc;
 540         return count;
 541 };
 542 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 543
 544 static ssize_t
 545 store_state_field(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 546 {
 547         int i;
 548         struct scsi_device *sdev = to_scsi_device(dev);
 549         enum scsi_device_state state = 0;
 550
 551         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 552                 const int len = strlen(sdev_states[i].name);
 553                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 554                    buf[len] == '\n') {
 555                         state = sdev_states[i].value;
 556                         break;
 557                 }
 558         }
 559         if (!state)
 560                 return -EINVAL;
 561
 562         if (scsi_device_set_state(sdev, state))
 563                 return -EINVAL;
 564         return count;
 565 }
 566
 567 static ssize_t
 568 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 569 {
 570         struct scsi_device *sdev = to_scsi_device(dev);
 571         const char *name = scsi_device_state_name(sdev->sdev_state);
 572
 573         if (!name)
 574                 return -EINVAL;
 575
 576         return snprintf(buf, 20, "%s\n", name);
 577 }
 578
 579 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 580
 581 static ssize_t
 582 show_queue_type_field(struct device *dev, struct device_attribute *attr, char *buf)
 583 {
 584         struct scsi_device *sdev = to_scsi_device(dev);
 585         const char *name = "none";
 586
 587         if (sdev->ordered_tags)
 588                 name = "ordered";
 589         else if (sdev->simple_tags)
 590                 name = "simple";
 591
 592         return snprintf(buf, 20, "%s\n", name);
 593 }
 594
 595 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
 596
 597 static ssize_t
 598 show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf)
 599 {
 600         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 601 }
 602
 603 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 604
 605 #define show_sdev_iostat(field)                                         \
 606 static ssize_t                                                          \
 607 show_iostat_##field(struct device *dev, struct device_attribute *attr, char *buf)                       \
 608 {                                                                       \
 609         struct scsi_device *sdev = to_scsi_device(dev);                 \
 610         unsigned long long count = atomic_read(&sdev->field);           \
 611         return snprintf(buf, 20, "0x%llx\n", count);                    \
 612 }                                                                       \
 613 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 614
 615 show_sdev_iostat(iorequest_cnt);
 616 show_sdev_iostat(iodone_cnt);
 617 show_sdev_iostat(ioerr_cnt);
 618
 619 static ssize_t
 620 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 621 {
 622         struct scsi_device *sdev;
 623         sdev = to_scsi_device(dev);
 624         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 625 }
 626 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 627
 628 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 629 static ssize_t                                                          \
 630 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 631                                 char *buf)                              \
 632 {                                                                       \
 633         struct scsi_device *sdev = to_scsi_device(dev);                 \
 634         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 635         return snprintf(buf, 20, "%d\n", val);                          \
 636 }
 637
 638 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 639 static ssize_t                                                          \
 640 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr, \
 641                       const char *buf, size_t count)                    \
 642 {                                                                       \
 643         struct scsi_device *sdev = to_scsi_device(dev);                 \
 644         int val = simple_strtoul(buf, NULL, 0);                         \
 645         if (val == 0)                                                   \
 646                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 647         else if (val == 1)                                              \
 648                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 649         else                                                            \
 650                 return -EINVAL;                                         \
 651         return count;                                                   \
 652 }
 653
 654 #define DECLARE_EVT(name, Cap_name)                                     \
 655         DECLARE_EVT_SHOW(name, Cap_name)                                \
 656         DECLARE_EVT_STORE(name, Cap_name)                               \
 657         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 658                            sdev_store_evt_##name);
 659 #define REF_EVT(name) &dev_attr_evt_##name.attr
 660
 661 DECLARE_EVT(media_change, MEDIA_CHANGE)
 662
 663 /* Default template for device attributes.  May NOT be modified */
 664 static struct attribute *scsi_sdev_attrs[] = {
 665         &dev_attr_device_blocked.attr,
 666         &dev_attr_type.attr,
 667         &dev_attr_scsi_level.attr,
 668         &dev_attr_vendor.attr,
 669         &dev_attr_model.attr,
 670         &dev_attr_rev.attr,
 671         &dev_attr_rescan.attr,
 672         &dev_attr_delete.attr,
 673         &dev_attr_state.attr,
 674         &dev_attr_timeout.attr,
 675         &dev_attr_iocounterbits.attr,
 676         &dev_attr_iorequest_cnt.attr,
 677         &dev_attr_iodone_cnt.attr,
 678         &dev_attr_ioerr_cnt.attr,
 679         &dev_attr_modalias.attr,
 680         REF_EVT(media_change),
 681         NULL
 682 };
 683
 684 static struct attribute_group scsi_sdev_attr_group = {
 685         .attrs =        scsi_sdev_attrs,
 686 };
 687
 688 static struct attribute_group *scsi_sdev_attr_groups[] = {
 689         &scsi_sdev_attr_group,
 690         NULL
 691 };
 692
 693 static ssize_t sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr, const char *buf,
 694                                          size_t count)
 695 {
 696         int depth, retval;
 697         struct scsi_device *sdev = to_scsi_device(dev);
 698         struct scsi_host_template *sht = sdev->host->hostt;
 699
 700         if (!sht->change_queue_depth)
 701                 return -EINVAL;
 702
 703         depth = simple_strtoul(buf, NULL, 0);
 704
 705         if (depth < 1)
 706                 return -EINVAL;
 707
 708         retval = sht->change_queue_depth(sdev, depth);
 709         if (retval < 0)
 710                 return retval;
 711
 712         return count;
 713 }
 714
 715 static struct device_attribute sdev_attr_queue_depth_rw =
 716         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 717                sdev_store_queue_depth_rw);
 718
 719 static ssize_t sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr, const char *buf,
 720                                         size_t count)
 721 {
 722         struct scsi_device *sdev = to_scsi_device(dev);
 723         struct scsi_host_template *sht = sdev->host->hostt;
 724         int tag_type = 0, retval;
 725         int prev_tag_type = scsi_get_tag_type(sdev);
 726
 727         if (!sdev->tagged_supported || !sht->change_queue_type)
 728                 return -EINVAL;
 729
 730         if (strncmp(buf, "ordered", 7) == 0)
 731                 tag_type = MSG_ORDERED_TAG;
 732         else if (strncmp(buf, "simple", 6) == 0)
 733                 tag_type = MSG_SIMPLE_TAG;
 734         else if (strncmp(buf, "none", 4) != 0)
 735                 return -EINVAL;
 736
 737         if (tag_type == prev_tag_type)
 738                 return count;
 739
 740         retval = sht->change_queue_type(sdev, tag_type);
 741         if (retval < 0)
 742                 return retval;
 743
 744         return count;
 745 }
 746
 747 static struct device_attribute sdev_attr_queue_type_rw =
 748         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 749                sdev_store_queue_type_rw);
 750
 751 /**
 752  * scsi_sysfs_add_sdev - add scsi device to sysfs
 753  * @sdev:       scsi_device to add
 754  *
 755  * Return value:
 756  *      0 on Success / non-zero on Failure
 757  **/
 758 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 759 {
 760         int error, i;
 761         struct request_queue *rq = sdev->request_queue;
 762
 763         if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0)
 764                 return error;
 765
 766         error = device_add(&sdev->sdev_gendev);
 767         if (error) {
 768                 put_device(sdev->sdev_gendev.parent);
 769                 printk(KERN_INFO "error 1\n");
 770                 return error;
 771         }
 772         error = class_device_add(&sdev->sdev_classdev);
 773         if (error) {
 774                 printk(KERN_INFO "error 2\n");
 775                 goto clean_device;
 776         }
 777
 778         /* take a reference for the sdev_classdev; this is
 779          * released by the sdev_class .release */
 780         get_device(&sdev->sdev_gendev);
 781
 782         /* create queue files, which may be writable, depending on the host */
 783         if (sdev->host->hostt->change_queue_depth)
 784                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_depth_rw);
 785         else
 786                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
 787         if (error) {
 788                 __scsi_remove_device(sdev);
 789                 goto out;
 790         }
 791         if (sdev->host->hostt->change_queue_type)
 792                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
 793         else
 794                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
 795         if (error) {
 796                 __scsi_remove_device(sdev);
 797                 goto out;
 798         }
 799
 800         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL);
 801
 802         if (error)
 803                 sdev_printk(KERN_INFO, sdev,
 804                             "Failed to register bsg queue, errno=%d\n", error);
 805
 806         /* we're treating error on bsg register as non-fatal, so pretend
 807          * nothing went wrong */
 808         error = 0;
 809
 810         /* add additional host specific attributes */
 811         if (sdev->host->hostt->sdev_attrs) {
 812                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
 813                         error = device_create_file(&sdev->sdev_gendev,
 814                                         sdev->host->hostt->sdev_attrs[i]);
 815                         if (error) {
 816                                 __scsi_remove_device(sdev);
 817                                 goto out;
 818                         }
 819                 }
 820         }
 821
 822         transport_add_device(&sdev->sdev_gendev);
 823  out:
 824         return error;
 825
 826  clean_device:
 827         scsi_device_set_state(sdev, SDEV_CANCEL);
 828
 829         device_del(&sdev->sdev_gendev);
 830         transport_destroy_device(&sdev->sdev_gendev);
 831         put_device(&sdev->sdev_gendev);
 832
 833         return error;
 834 }
 835
 836 void __scsi_remove_device(struct scsi_device *sdev)
 837 {
 838         struct device *dev = &sdev->sdev_gendev;
 839
 840         if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
 841                 return;
 842
 843         bsg_unregister_queue(sdev->request_queue);
 844         class_device_unregister(&sdev->sdev_classdev);
 845         transport_remove_device(dev);
 846         device_del(dev);
 847         scsi_device_set_state(sdev, SDEV_DEL);
 848         if (sdev->host->hostt->slave_destroy)
 849                 sdev->host->hostt->slave_destroy(sdev);
 850         transport_destroy_device(dev);
 851         put_device(dev);
 852 }
 853
 854 /**
 855  * scsi_remove_device - unregister a device from the scsi bus
 856  * @sdev:       scsi_device to unregister
 857  **/
 858 void scsi_remove_device(struct scsi_device *sdev)
 859 {
 860         struct Scsi_Host *shost = sdev->host;
 861
 862         mutex_lock(&shost->scan_mutex);
 863         __scsi_remove_device(sdev);
 864         mutex_unlock(&shost->scan_mutex);
 865 }
 866 EXPORT_SYMBOL(scsi_remove_device);
 867
 868 static void __scsi_remove_target(struct scsi_target *starget)
 869 {
 870         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 871         unsigned long flags;
 872         struct scsi_device *sdev;
 873
 874         spin_lock_irqsave(shost->host_lock, flags);
 875         starget->reap_ref++;
 876  restart:
 877         list_for_each_entry(sdev, &shost->__devices, siblings) {
 878                 if (sdev->channel != starget->channel ||
 879                     sdev->id != starget->id ||
 880                     sdev->sdev_state == SDEV_DEL)
 881                         continue;
 882                 spin_unlock_irqrestore(shost->host_lock, flags);
 883                 scsi_remove_device(sdev);
 884                 spin_lock_irqsave(shost->host_lock, flags);
 885                 goto restart;
 886         }
 887         spin_unlock_irqrestore(shost->host_lock, flags);
 888         scsi_target_reap(starget);
 889 }
 890
 891 static int __remove_child (struct device * dev, void * data)
 892 {
 893         if (scsi_is_target_device(dev))
 894                 __scsi_remove_target(to_scsi_target(dev));
 895         return 0;
 896 }
 897
 898 /**
 899  * scsi_remove_target - try to remove a target and all its devices
 900  * @dev: generic starget or parent of generic stargets to be removed
 901  *
 902  * Note: This is slightly racy.  It is possible that if the user
 903  * requests the addition of another device then the target won't be
 904  * removed.
 905  */
 906 void scsi_remove_target(struct device *dev)
 907 {
 908         struct device *rdev;
 909
 910         if (scsi_is_target_device(dev)) {
 911                 __scsi_remove_target(to_scsi_target(dev));
 912                 return;
 913         }
 914
 915         rdev = get_device(dev);
 916         device_for_each_child(dev, NULL, __remove_child);
 917         put_device(rdev);
 918 }
 919 EXPORT_SYMBOL(scsi_remove_target);
 920
 921 int scsi_register_driver(struct device_driver *drv)
 922 {
 923         drv->bus = &scsi_bus_type;
 924
 925         return driver_register(drv);
 926 }
 927 EXPORT_SYMBOL(scsi_register_driver);
 928
 929 int scsi_register_interface(struct class_interface *intf)
 930 {
 931         intf->class = &sdev_class;
 932
 933         return class_interface_register(intf);
 934 }
 935 EXPORT_SYMBOL(scsi_register_interface);
 936
 937
 938 static struct class_device_attribute *class_attr_overridden(
 939                 struct class_device_attribute **attrs,
 940                 struct class_device_attribute *attr)
 941 {
 942         int i;
 943
 944         if (!attrs)
 945                 return NULL;
 946         for (i = 0; attrs[i]; i++)
 947                 if (!strcmp(attrs[i]->attr.name, attr->attr.name))
 948                         return attrs[i];
 949         return NULL;
 950 }
 951
 952 static int class_attr_add(struct class_device *classdev,
 953                 struct class_device_attribute *attr)
 954 {
 955         struct class_device_attribute *base_attr;
 956
 957         /*
 958          * Spare the caller from having to copy things it's not interested in.
 959          */
 960         base_attr = class_attr_overridden(scsi_sysfs_shost_attrs, attr);
 961         if (base_attr) {
 962                 /* extend permissions */
 963                 attr->attr.mode |= base_attr->attr.mode;
 964
 965                 /* override null show/store with default */
 966                 if (!attr->show)
 967                         attr->show = base_attr->show;
 968                 if (!attr->store)
 969                         attr->store = base_attr->store;
 970         }
 971
 972         return class_device_create_file(classdev, attr);
 973 }
 974
 975 /**
 976  * scsi_sysfs_add_host - add scsi host to subsystem
 977  * @shost:     scsi host struct to add to subsystem
 978  * @dev:       parent struct device pointer
 979  **/
 980 int scsi_sysfs_add_host(struct Scsi_Host *shost)
 981 {
 982         int error, i;
 983
 984         if (shost->hostt->shost_attrs) {
 985                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
 986                         error = class_attr_add(&shost->shost_classdev,
 987                                         shost->hostt->shost_attrs[i]);
 988                         if (error)
 989                                 return error;
 990                 }
 991         }
 992
 993         for (i = 0; scsi_sysfs_shost_attrs[i]; i++) {
 994                 if (!class_attr_overridden(shost->hostt->shost_attrs,
 995                                         scsi_sysfs_shost_attrs[i])) {
 996                         error = class_device_create_file(&shost->shost_classdev,
 997                                         scsi_sysfs_shost_attrs[i]);
 998                         if (error)
 999                                 return error;
1000                 }
1001         }
1002
1003         transport_register_device(&shost->shost_gendev);
1004         return 0;
1005 }
1006
1007 static struct device_type scsi_dev_type = {
1008         .name =         "scsi_device",
1009         .release =      scsi_device_dev_release,
1010         .groups =       scsi_sdev_attr_groups,
1011 };
1012
1013 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1014 {
1015         unsigned long flags;
1016         struct Scsi_Host *shost = sdev->host;
1017         struct scsi_target  *starget = sdev->sdev_target;
1018
1019         device_initialize(&sdev->sdev_gendev);
1020         sdev->sdev_gendev.bus = &scsi_bus_type;
1021         sdev->sdev_gendev.type = &scsi_dev_type;
1022         sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d",
1023                 sdev->host->host_no, sdev->channel, sdev->id,
1024                 sdev->lun);
1025
1026         class_device_initialize(&sdev->sdev_classdev);
1027         sdev->sdev_classdev.dev = &sdev->sdev_gendev;
1028         sdev->sdev_classdev.class = &sdev_class;
1029         snprintf(sdev->sdev_classdev.class_id, BUS_ID_SIZE,
1030                  "%d:%d:%d:%d", sdev->host->host_no,
1031                  sdev->channel, sdev->id, sdev->lun);
1032         sdev->scsi_level = starget->scsi_level;
1033         transport_setup_device(&sdev->sdev_gendev);
1034         spin_lock_irqsave(shost->host_lock, flags);
1035         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1036         list_add_tail(&sdev->siblings, &shost->__devices);
1037         spin_unlock_irqrestore(shost->host_lock, flags);
1038 }
1039
1040 int scsi_is_sdev_device(const struct device *dev)
1041 {
1042         return dev->type == &scsi_dev_type;
1043 }
1044 EXPORT_SYMBOL(scsi_is_sdev_device);
1045
1046 /* A blank transport template that is used in drivers that don't
1047  * yet implement Transport Attributes */
1048 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };