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 struct device_type scsi_dev_type;
  25
  26 static const struct {
  27         enum scsi_device_state  value;
  28         char                    *name;
  29 } sdev_states[] = {
  30         { SDEV_CREATED, "created" },
  31         { SDEV_RUNNING, "running" },
  32         { SDEV_CANCEL, "cancel" },
  33         { SDEV_DEL, "deleted" },
  34         { SDEV_QUIESCE, "quiesce" },
  35         { SDEV_OFFLINE, "offline" },
  36         { SDEV_BLOCK,   "blocked" },
  37 };
  38
  39 const char *scsi_device_state_name(enum scsi_device_state state)
  40 {
  41         int i;
  42         char *name = NULL;
  43
  44         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
  45                 if (sdev_states[i].value == state) {
  46                         name = sdev_states[i].name;
  47                         break;
  48                 }
  49         }
  50         return name;
  51 }
  52
  53 static const struct {
  54         enum scsi_host_state    value;
  55         char                    *name;
  56 } shost_states[] = {
  57         { SHOST_CREATED, "created" },
  58         { SHOST_RUNNING, "running" },
  59         { SHOST_CANCEL, "cancel" },
  60         { SHOST_DEL, "deleted" },
  61         { SHOST_RECOVERY, "recovery" },
  62         { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
  63         { SHOST_DEL_RECOVERY, "deleted/recovery", },
  64 };
  65 const char *scsi_host_state_name(enum scsi_host_state state)
  66 {
  67         int i;
  68         char *name = NULL;
  69
  70         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
  71                 if (shost_states[i].value == state) {
  72                         name = shost_states[i].name;
  73                         break;
  74                 }
  75         }
  76         return name;
  77 }
  78
  79 static int check_set(unsigned int *val, char *src)
  80 {
  81         char *last;
  82
  83         if (strncmp(src, "-", 20) == 0) {
  84                 *val = SCAN_WILD_CARD;
  85         } else {
  86                 /*
  87                  * Doesn't check for int overflow
  88                  */
  89                 *val = simple_strtoul(src, &last, 0);
  90                 if (*last != '\0')
  91                         return 1;
  92         }
  93         return 0;
  94 }
  95
  96 static int scsi_scan(struct Scsi_Host *shost, const char *str)
  97 {
  98         char s1[15], s2[15], s3[15], junk;
  99         unsigned int channel, id, lun;
 100         int res;
 101
 102         res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk);
 103         if (res != 3)
 104                 return -EINVAL;
 105         if (check_set(&channel, s1))
 106                 return -EINVAL;
 107         if (check_set(&id, s2))
 108                 return -EINVAL;
 109         if (check_set(&lun, s3))
 110                 return -EINVAL;
 111         if (shost->transportt->user_scan)
 112                 res = shost->transportt->user_scan(shost, channel, id, lun);
 113         else
 114                 res = scsi_scan_host_selected(shost, channel, id, lun, 1);
 115         return res;
 116 }
 117
 118 /*
 119  * shost_show_function: macro to create an attr function that can be used to
 120  * show a non-bit field.
 121  */
 122 #define shost_show_function(name, field, format_string)                 \
 123 static ssize_t                                                          \
 124 show_##name (struct device *dev, struct device_attribute *attr,         \
 125              char *buf)                                                 \
 126 {                                                                       \
 127         struct Scsi_Host *shost = class_to_shost(dev);                  \
 128         return snprintf (buf, 20, format_string, shost->field);         \
 129 }
 130
 131 /*
 132  * shost_rd_attr: macro to create a function and attribute variable for a
 133  * read only field.
 134  */
 135 #define shost_rd_attr2(name, field, format_string)                      \
 136         shost_show_function(name, field, format_string)                 \
 137 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
 138
 139 #define shost_rd_attr(field, format_string) \
 140 shost_rd_attr2(field, field, format_string)
 141
 142 /*
 143  * Create the actual show/store functions and data structures.
 144  */
 145
 146 static ssize_t
 147 store_scan(struct device *dev, struct device_attribute *attr,
 148            const char *buf, size_t count)
 149 {
 150         struct Scsi_Host *shost = class_to_shost(dev);
 151         int res;
 152
 153         res = scsi_scan(shost, buf);
 154         if (res == 0)
 155                 res = count;
 156         return res;
 157 };
 158 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
 159
 160 static ssize_t
 161 store_shost_state(struct device *dev, struct device_attribute *attr,
 162                   const char *buf, size_t count)
 163 {
 164         int i;
 165         struct Scsi_Host *shost = class_to_shost(dev);
 166         enum scsi_host_state state = 0;
 167
 168         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
 169                 const int len = strlen(shost_states[i].name);
 170                 if (strncmp(shost_states[i].name, buf, len) == 0 &&
 171                    buf[len] == '\n') {
 172                         state = shost_states[i].value;
 173                         break;
 174                 }
 175         }
 176         if (!state)
 177                 return -EINVAL;
 178
 179         if (scsi_host_set_state(shost, state))
 180                 return -EINVAL;
 181         return count;
 182 }
 183
 184 static ssize_t
 185 show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
 186 {
 187         struct Scsi_Host *shost = class_to_shost(dev);
 188         const char *name = scsi_host_state_name(shost->shost_state);
 189
 190         if (!name)
 191                 return -EINVAL;
 192
 193         return snprintf(buf, 20, "%s\n", name);
 194 }
 195
 196 /* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
 197 struct device_attribute dev_attr_hstate =
 198         __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
 199
 200 static ssize_t
 201 show_shost_mode(unsigned int mode, char *buf)
 202 {
 203         ssize_t len = 0;
 204
 205         if (mode & MODE_INITIATOR)
 206                 len = sprintf(buf, "%s", "Initiator");
 207
 208         if (mode & MODE_TARGET)
 209                 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
 210
 211         len += sprintf(buf + len, "\n");
 212
 213         return len;
 214 }
 215
 216 static ssize_t
 217 show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
 218                           char *buf)
 219 {
 220         struct Scsi_Host *shost = class_to_shost(dev);
 221         unsigned int supported_mode = shost->hostt->supported_mode;
 222
 223         if (supported_mode == MODE_UNKNOWN)
 224                 /* by default this should be initiator */
 225                 supported_mode = MODE_INITIATOR;
 226
 227         return show_shost_mode(supported_mode, buf);
 228 }
 229
 230 static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
 231
 232 static ssize_t
 233 show_shost_active_mode(struct device *dev,
 234                        struct device_attribute *attr, char *buf)
 235 {
 236         struct Scsi_Host *shost = class_to_shost(dev);
 237
 238         if (shost->active_mode == MODE_UNKNOWN)
 239                 return snprintf(buf, 20, "unknown\n");
 240         else
 241                 return show_shost_mode(shost->active_mode, buf);
 242 }
 243
 244 static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
 245
 246 shost_rd_attr(unique_id, "%u\n");
 247 shost_rd_attr(host_busy, "%hu\n");
 248 shost_rd_attr(cmd_per_lun, "%hd\n");
 249 shost_rd_attr(can_queue, "%hd\n");
 250 shost_rd_attr(sg_tablesize, "%hu\n");
 251 shost_rd_attr(unchecked_isa_dma, "%d\n");
 252 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
 253
 254 static struct attribute *scsi_sysfs_shost_attrs[] = {
 255         &dev_attr_unique_id.attr,
 256         &dev_attr_host_busy.attr,
 257         &dev_attr_cmd_per_lun.attr,
 258         &dev_attr_can_queue.attr,
 259         &dev_attr_sg_tablesize.attr,
 260         &dev_attr_unchecked_isa_dma.attr,
 261         &dev_attr_proc_name.attr,
 262         &dev_attr_scan.attr,
 263         &dev_attr_hstate.attr,
 264         &dev_attr_supported_mode.attr,
 265         &dev_attr_active_mode.attr,
 266         NULL
 267 };
 268
 269 struct attribute_group scsi_shost_attr_group = {
 270         .attrs =        scsi_sysfs_shost_attrs,
 271 };
 272
 273 struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
 274         &scsi_shost_attr_group,
 275         NULL
 276 };
 277
 278 static void scsi_device_cls_release(struct device *class_dev)
 279 {
 280         struct scsi_device *sdev;
 281
 282         sdev = class_to_sdev(class_dev);
 283         put_device(&sdev->sdev_gendev);
 284 }
 285
 286 static void scsi_device_dev_release_usercontext(struct work_struct *work)
 287 {
 288         struct scsi_device *sdev;
 289         struct device *parent;
 290         struct scsi_target *starget;
 291         struct list_head *this, *tmp;
 292         unsigned long flags;
 293
 294         sdev = container_of(work, struct scsi_device, ew.work);
 295
 296         parent = sdev->sdev_gendev.parent;
 297         starget = to_scsi_target(parent);
 298
 299         spin_lock_irqsave(sdev->host->host_lock, flags);
 300         starget->reap_ref++;
 301         list_del(&sdev->siblings);
 302         list_del(&sdev->same_target_siblings);
 303         list_del(&sdev->starved_entry);
 304         spin_unlock_irqrestore(sdev->host->host_lock, flags);
 305
 306         cancel_work_sync(&sdev->event_work);
 307
 308         list_for_each_safe(this, tmp, &sdev->event_list) {
 309                 struct scsi_event *evt;
 310
 311                 evt = list_entry(this, struct scsi_event, node);
 312                 list_del(&evt->node);
 313                 kfree(evt);
 314         }
 315
 316         if (sdev->request_queue) {
 317                 sdev->request_queue->queuedata = NULL;
 318                 /* user context needed to free queue */
 319                 scsi_free_queue(sdev->request_queue);
 320                 /* temporary expedient, try to catch use of queue lock
 321                  * after free of sdev */
 322                 sdev->request_queue = NULL;
 323         }
 324
 325         scsi_target_reap(scsi_target(sdev));
 326
 327         kfree(sdev->inquiry);
 328         kfree(sdev);
 329
 330         if (parent)
 331                 put_device(parent);
 332 }
 333
 334 static void scsi_device_dev_release(struct device *dev)
 335 {
 336         struct scsi_device *sdp = to_scsi_device(dev);
 337         execute_in_process_context(scsi_device_dev_release_usercontext,
 338                                    &sdp->ew);
 339 }
 340
 341 static struct class sdev_class = {
 342         .name           = "scsi_device",
 343         .dev_release    = scsi_device_cls_release,
 344 };
 345
 346 /* all probing is done in the individual ->probe routines */
 347 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 348 {
 349         struct scsi_device *sdp;
 350
 351         if (dev->type != &scsi_dev_type)
 352                 return 0;
 353
 354         sdp = to_scsi_device(dev);
 355         if (sdp->no_uld_attach)
 356                 return 0;
 357         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 358 }
 359
 360 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 361 {
 362         struct scsi_device *sdev;
 363
 364         if (dev->type != &scsi_dev_type)
 365                 return 0;
 366
 367         sdev = to_scsi_device(dev);
 368
 369         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 370         return 0;
 371 }
 372
 373 static int scsi_bus_suspend(struct device * dev, pm_message_t state)
 374 {
 375         struct device_driver *drv;
 376         struct scsi_device *sdev;
 377         int err;
 378
 379         if (dev->type != &scsi_dev_type)
 380                 return 0;
 381
 382         drv = dev->driver;
 383         sdev = to_scsi_device(dev);
 384
 385         err = scsi_device_quiesce(sdev);
 386         if (err)
 387                 return err;
 388
 389         if (drv && drv->suspend) {
 390                 err = drv->suspend(dev, state);
 391                 if (err)
 392                         return err;
 393         }
 394
 395         return 0;
 396 }
 397
 398 static int scsi_bus_resume(struct device * dev)
 399 {
 400         struct device_driver *drv;
 401         struct scsi_device *sdev;
 402         int err = 0;
 403
 404         if (dev->type != &scsi_dev_type)
 405                 return 0;
 406
 407         drv = dev->driver;
 408         sdev = to_scsi_device(dev);
 409
 410         if (drv && drv->resume)
 411                 err = drv->resume(dev);
 412
 413         scsi_device_resume(sdev);
 414
 415         return err;
 416 }
 417
 418 static int scsi_bus_remove(struct device *dev)
 419 {
 420         struct device_driver *drv = dev->driver;
 421         struct scsi_device *sdev = to_scsi_device(dev);
 422         int err = 0;
 423
 424         /* reset the prep_fn back to the default since the
 425          * driver may have altered it and it's being removed */
 426         blk_queue_prep_rq(sdev->request_queue, scsi_prep_fn);
 427
 428         if (drv && drv->remove)
 429                 err = drv->remove(dev);
 430
 431         return 0;
 432 }
 433
 434 struct bus_type scsi_bus_type = {
 435         .name           = "scsi",
 436         .match          = scsi_bus_match,
 437         .uevent         = scsi_bus_uevent,
 438         .suspend        = scsi_bus_suspend,
 439         .resume         = scsi_bus_resume,
 440         .remove         = scsi_bus_remove,
 441 };
 442
 443 int scsi_sysfs_register(void)
 444 {
 445         int error;
 446
 447         error = bus_register(&scsi_bus_type);
 448         if (!error) {
 449                 error = class_register(&sdev_class);
 450                 if (error)
 451                         bus_unregister(&scsi_bus_type);
 452         }
 453
 454         return error;
 455 }
 456
 457 void scsi_sysfs_unregister(void)
 458 {
 459         class_unregister(&sdev_class);
 460         bus_unregister(&scsi_bus_type);
 461 }
 462
 463 /*
 464  * sdev_show_function: macro to create an attr function that can be used to
 465  * show a non-bit field.
 466  */
 467 #define sdev_show_function(field, format_string)                                \
 468 static ssize_t                                                          \
 469 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 470                    char *buf)                                           \
 471 {                                                                       \
 472         struct scsi_device *sdev;                                       \
 473         sdev = to_scsi_device(dev);                                     \
 474         return snprintf (buf, 20, format_string, sdev->field);          \
 475 }                                                                       \
 476
 477 /*
 478  * sdev_rd_attr: macro to create a function and attribute variable for a
 479  * read only field.
 480  */
 481 #define sdev_rd_attr(field, format_string)                              \
 482         sdev_show_function(field, format_string)                        \
 483 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 484
 485
 486 /*
 487  * sdev_rd_attr: create a function and attribute variable for a
 488  * read/write field.
 489  */
 490 #define sdev_rw_attr(field, format_string)                              \
 491         sdev_show_function(field, format_string)                                \
 492                                                                         \
 493 static ssize_t                                                          \
 494 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 495                     const char *buf, size_t count)                      \
 496 {                                                                       \
 497         struct scsi_device *sdev;                                       \
 498         sdev = to_scsi_device(dev);                                     \
 499         snscanf (buf, 20, format_string, &sdev->field);                 \
 500         return count;                                                   \
 501 }                                                                       \
 502 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 503
 504 /* Currently we don't export bit fields, but we might in future,
 505  * so leave this code in */
 506 #if 0
 507 /*
 508  * sdev_rd_attr: create a function and attribute variable for a
 509  * read/write bit field.
 510  */
 511 #define sdev_rw_attr_bit(field)                                         \
 512         sdev_show_function(field, "%d\n")                                       \
 513                                                                         \
 514 static ssize_t                                                          \
 515 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 516                     const char *buf, size_t count)                      \
 517 {                                                                       \
 518         int ret;                                                        \
 519         struct scsi_device *sdev;                                       \
 520         ret = scsi_sdev_check_buf_bit(buf);                             \
 521         if (ret >= 0)   {                                               \
 522                 sdev = to_scsi_device(dev);                             \
 523                 sdev->field = ret;                                      \
 524                 ret = count;                                            \
 525         }                                                               \
 526         return ret;                                                     \
 527 }                                                                       \
 528 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 529
 530 /*
 531  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 532  * else return -EINVAL.
 533  */
 534 static int scsi_sdev_check_buf_bit(const char *buf)
 535 {
 536         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 537                 if (buf[0] == '1')
 538                         return 1;
 539                 else if (buf[0] == '0')
 540                         return 0;
 541                 else
 542                         return -EINVAL;
 543         } else
 544                 return -EINVAL;
 545 }
 546 #endif
 547 /*
 548  * Create the actual show/store functions and data structures.
 549  */
 550 sdev_rd_attr (device_blocked, "%d\n");
 551 sdev_rd_attr (queue_depth, "%d\n");
 552 sdev_rd_attr (type, "%d\n");
 553 sdev_rd_attr (scsi_level, "%d\n");
 554 sdev_rd_attr (vendor, "%.8s\n");
 555 sdev_rd_attr (model, "%.16s\n");
 556 sdev_rd_attr (rev, "%.4s\n");
 557
 558 static ssize_t
 559 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 560 {
 561         struct scsi_device *sdev;
 562         sdev = to_scsi_device(dev);
 563         return snprintf (buf, 20, "%d\n", sdev->timeout / HZ);
 564 }
 565
 566 static ssize_t
 567 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 568                     const char *buf, size_t count)
 569 {
 570         struct scsi_device *sdev;
 571         int timeout;
 572         sdev = to_scsi_device(dev);
 573         sscanf (buf, "%d\n", &timeout);
 574         sdev->timeout = timeout * HZ;
 575         return count;
 576 }
 577 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 578
 579 static ssize_t
 580 store_rescan_field (struct device *dev, struct device_attribute *attr,
 581                     const char *buf, size_t count)
 582 {
 583         scsi_rescan_device(dev);
 584         return count;
 585 }
 586 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 587
 588 static void sdev_store_delete_callback(struct device *dev)
 589 {
 590         scsi_remove_device(to_scsi_device(dev));
 591 }
 592
 593 static ssize_t
 594 sdev_store_delete(struct device *dev, struct device_attribute *attr,
 595                   const char *buf, size_t count)
 596 {
 597         int rc;
 598
 599         /* An attribute cannot be unregistered by one of its own methods,
 600          * so we have to use this roundabout approach.
 601          */
 602         rc = device_schedule_callback(dev, sdev_store_delete_callback);
 603         if (rc)
 604                 count = rc;
 605         return count;
 606 };
 607 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 608
 609 static ssize_t
 610 store_state_field(struct device *dev, struct device_attribute *attr,
 611                   const char *buf, size_t count)
 612 {
 613         int i;
 614         struct scsi_device *sdev = to_scsi_device(dev);
 615         enum scsi_device_state state = 0;
 616
 617         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 618                 const int len = strlen(sdev_states[i].name);
 619                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 620                    buf[len] == '\n') {
 621                         state = sdev_states[i].value;
 622                         break;
 623                 }
 624         }
 625         if (!state)
 626                 return -EINVAL;
 627
 628         if (scsi_device_set_state(sdev, state))
 629                 return -EINVAL;
 630         return count;
 631 }
 632
 633 static ssize_t
 634 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 635 {
 636         struct scsi_device *sdev = to_scsi_device(dev);
 637         const char *name = scsi_device_state_name(sdev->sdev_state);
 638
 639         if (!name)
 640                 return -EINVAL;
 641
 642         return snprintf(buf, 20, "%s\n", name);
 643 }
 644
 645 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 646
 647 static ssize_t
 648 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 649                       char *buf)
 650 {
 651         struct scsi_device *sdev = to_scsi_device(dev);
 652         const char *name = "none";
 653
 654         if (sdev->ordered_tags)
 655                 name = "ordered";
 656         else if (sdev->simple_tags)
 657                 name = "simple";
 658
 659         return snprintf(buf, 20, "%s\n", name);
 660 }
 661
 662 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
 663
 664 static ssize_t
 665 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,                              char *buf)
 666 {
 667         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 668 }
 669
 670 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 671
 672 #define show_sdev_iostat(field)                                         \
 673 static ssize_t                                                          \
 674 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 675                     char *buf)                                          \
 676 {                                                                       \
 677         struct scsi_device *sdev = to_scsi_device(dev);                 \
 678         unsigned long long count = atomic_read(&sdev->field);           \
 679         return snprintf(buf, 20, "0x%llx\n", count);                    \
 680 }                                                                       \
 681 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 682
 683 show_sdev_iostat(iorequest_cnt);
 684 show_sdev_iostat(iodone_cnt);
 685 show_sdev_iostat(ioerr_cnt);
 686
 687 static ssize_t
 688 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 689 {
 690         struct scsi_device *sdev;
 691         sdev = to_scsi_device(dev);
 692         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 693 }
 694 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 695
 696 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 697 static ssize_t                                                          \
 698 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 699                      char *buf)                                         \
 700 {                                                                       \
 701         struct scsi_device *sdev = to_scsi_device(dev);                 \
 702         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 703         return snprintf(buf, 20, "%d\n", val);                          \
 704 }
 705
 706 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 707 static ssize_t                                                          \
 708 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 709                       const char *buf, size_t count)                    \
 710 {                                                                       \
 711         struct scsi_device *sdev = to_scsi_device(dev);                 \
 712         int val = simple_strtoul(buf, NULL, 0);                         \
 713         if (val == 0)                                                   \
 714                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 715         else if (val == 1)                                              \
 716                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 717         else                                                            \
 718                 return -EINVAL;                                         \
 719         return count;                                                   \
 720 }
 721
 722 #define DECLARE_EVT(name, Cap_name)                                     \
 723         DECLARE_EVT_SHOW(name, Cap_name)                                \
 724         DECLARE_EVT_STORE(name, Cap_name)                               \
 725         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 726                            sdev_store_evt_##name);
 727 #define REF_EVT(name) &dev_attr_evt_##name.attr
 728
 729 DECLARE_EVT(media_change, MEDIA_CHANGE)
 730
 731 /* Default template for device attributes.  May NOT be modified */
 732 static struct attribute *scsi_sdev_attrs[] = {
 733         &dev_attr_device_blocked.attr,
 734         &dev_attr_type.attr,
 735         &dev_attr_scsi_level.attr,
 736         &dev_attr_vendor.attr,
 737         &dev_attr_model.attr,
 738         &dev_attr_rev.attr,
 739         &dev_attr_rescan.attr,
 740         &dev_attr_delete.attr,
 741         &dev_attr_state.attr,
 742         &dev_attr_timeout.attr,
 743         &dev_attr_iocounterbits.attr,
 744         &dev_attr_iorequest_cnt.attr,
 745         &dev_attr_iodone_cnt.attr,
 746         &dev_attr_ioerr_cnt.attr,
 747         &dev_attr_modalias.attr,
 748         REF_EVT(media_change),
 749         NULL
 750 };
 751
 752 static struct attribute_group scsi_sdev_attr_group = {
 753         .attrs =        scsi_sdev_attrs,
 754 };
 755
 756 static struct attribute_group *scsi_sdev_attr_groups[] = {
 757         &scsi_sdev_attr_group,
 758         NULL
 759 };
 760
 761 static ssize_t
 762 sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
 763                           const char *buf, size_t count)
 764 {
 765         int depth, retval;
 766         struct scsi_device *sdev = to_scsi_device(dev);
 767         struct scsi_host_template *sht = sdev->host->hostt;
 768
 769         if (!sht->change_queue_depth)
 770                 return -EINVAL;
 771
 772         depth = simple_strtoul(buf, NULL, 0);
 773
 774         if (depth < 1)
 775                 return -EINVAL;
 776
 777         retval = sht->change_queue_depth(sdev, depth);
 778         if (retval < 0)
 779                 return retval;
 780
 781         return count;
 782 }
 783
 784 static struct device_attribute sdev_attr_queue_depth_rw =
 785         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 786                sdev_store_queue_depth_rw);
 787
 788 static ssize_t
 789 sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
 790                          const char *buf, size_t count)
 791 {
 792         struct scsi_device *sdev = to_scsi_device(dev);
 793         struct scsi_host_template *sht = sdev->host->hostt;
 794         int tag_type = 0, retval;
 795         int prev_tag_type = scsi_get_tag_type(sdev);
 796
 797         if (!sdev->tagged_supported || !sht->change_queue_type)
 798                 return -EINVAL;
 799
 800         if (strncmp(buf, "ordered", 7) == 0)
 801                 tag_type = MSG_ORDERED_TAG;
 802         else if (strncmp(buf, "simple", 6) == 0)
 803                 tag_type = MSG_SIMPLE_TAG;
 804         else if (strncmp(buf, "none", 4) != 0)
 805                 return -EINVAL;
 806
 807         if (tag_type == prev_tag_type)
 808                 return count;
 809
 810         retval = sht->change_queue_type(sdev, tag_type);
 811         if (retval < 0)
 812                 return retval;
 813
 814         return count;
 815 }
 816
 817 static int scsi_target_add(struct scsi_target *starget)
 818 {
 819         int error;
 820
 821         if (starget->state != STARGET_CREATED)
 822                 return 0;
 823
 824         error = device_add(&starget->dev);
 825         if (error) {
 826                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
 827                 get_device(&starget->dev);
 828                 scsi_target_reap(starget);
 829                 put_device(&starget->dev);
 830                 return error;
 831         }
 832         transport_add_device(&starget->dev);
 833         starget->state = STARGET_RUNNING;
 834
 835         return 0;
 836 }
 837
 838 static struct device_attribute sdev_attr_queue_type_rw =
 839         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 840                sdev_store_queue_type_rw);
 841
 842 /**
 843  * scsi_sysfs_add_sdev - add scsi device to sysfs
 844  * @sdev:       scsi_device to add
 845  *
 846  * Return value:
 847  *      0 on Success / non-zero on Failure
 848  **/
 849 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 850 {
 851         int error, i;
 852         struct request_queue *rq = sdev->request_queue;
 853         struct scsi_target *starget = sdev->sdev_target;
 854
 855         if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0)
 856                 return error;
 857
 858         error = scsi_target_add(starget);
 859         if (error)
 860                 return error;
 861
 862         transport_configure_device(&starget->dev);
 863         error = device_add(&sdev->sdev_gendev);
 864         if (error) {
 865                 put_device(sdev->sdev_gendev.parent);
 866                 printk(KERN_INFO "error 1\n");
 867                 return error;
 868         }
 869         error = device_add(&sdev->sdev_dev);
 870         if (error) {
 871                 printk(KERN_INFO "error 2\n");
 872                 goto clean_device;
 873         }
 874
 875         /* take a reference for the sdev_dev; this is
 876          * released by the sdev_class .release */
 877         get_device(&sdev->sdev_gendev);
 878
 879         /* create queue files, which may be writable, depending on the host */
 880         if (sdev->host->hostt->change_queue_depth)
 881                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_depth_rw);
 882         else
 883                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
 884         if (error) {
 885                 __scsi_remove_device(sdev);
 886                 goto out;
 887         }
 888         if (sdev->host->hostt->change_queue_type)
 889                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
 890         else
 891                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
 892         if (error) {
 893                 __scsi_remove_device(sdev);
 894                 goto out;
 895         }
 896
 897         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
 898
 899         if (error)
 900                 sdev_printk(KERN_INFO, sdev,
 901                             "Failed to register bsg queue, errno=%d\n", error);
 902
 903         /* we're treating error on bsg register as non-fatal, so pretend
 904          * nothing went wrong */
 905         error = 0;
 906
 907         /* add additional host specific attributes */
 908         if (sdev->host->hostt->sdev_attrs) {
 909                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
 910                         error = device_create_file(&sdev->sdev_gendev,
 911                                         sdev->host->hostt->sdev_attrs[i]);
 912                         if (error) {
 913                                 __scsi_remove_device(sdev);
 914                                 goto out;
 915                         }
 916                 }
 917         }
 918
 919         transport_add_device(&sdev->sdev_gendev);
 920  out:
 921         return error;
 922
 923  clean_device:
 924         scsi_device_set_state(sdev, SDEV_CANCEL);
 925
 926         device_del(&sdev->sdev_gendev);
 927         transport_destroy_device(&sdev->sdev_gendev);
 928         put_device(&sdev->sdev_gendev);
 929
 930         return error;
 931 }
 932
 933 void __scsi_remove_device(struct scsi_device *sdev)
 934 {
 935         struct device *dev = &sdev->sdev_gendev;
 936
 937         if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
 938                 return;
 939
 940         bsg_unregister_queue(sdev->request_queue);
 941         device_unregister(&sdev->sdev_dev);
 942         transport_remove_device(dev);
 943         device_del(dev);
 944         scsi_device_set_state(sdev, SDEV_DEL);
 945         if (sdev->host->hostt->slave_destroy)
 946                 sdev->host->hostt->slave_destroy(sdev);
 947         transport_destroy_device(dev);
 948         put_device(dev);
 949 }
 950
 951 /**
 952  * scsi_remove_device - unregister a device from the scsi bus
 953  * @sdev:       scsi_device to unregister
 954  **/
 955 void scsi_remove_device(struct scsi_device *sdev)
 956 {
 957         struct Scsi_Host *shost = sdev->host;
 958
 959         mutex_lock(&shost->scan_mutex);
 960         __scsi_remove_device(sdev);
 961         mutex_unlock(&shost->scan_mutex);
 962 }
 963 EXPORT_SYMBOL(scsi_remove_device);
 964
 965 static void __scsi_remove_target(struct scsi_target *starget)
 966 {
 967         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 968         unsigned long flags;
 969         struct scsi_device *sdev;
 970
 971         spin_lock_irqsave(shost->host_lock, flags);
 972         starget->reap_ref++;
 973  restart:
 974         list_for_each_entry(sdev, &shost->__devices, siblings) {
 975                 if (sdev->channel != starget->channel ||
 976                     sdev->id != starget->id ||
 977                     sdev->sdev_state == SDEV_DEL)
 978                         continue;
 979                 spin_unlock_irqrestore(shost->host_lock, flags);
 980                 scsi_remove_device(sdev);
 981                 spin_lock_irqsave(shost->host_lock, flags);
 982                 goto restart;
 983         }
 984         spin_unlock_irqrestore(shost->host_lock, flags);
 985         scsi_target_reap(starget);
 986 }
 987
 988 static int __remove_child (struct device * dev, void * data)
 989 {
 990         if (scsi_is_target_device(dev))
 991                 __scsi_remove_target(to_scsi_target(dev));
 992         return 0;
 993 }
 994
 995 /**
 996  * scsi_remove_target - try to remove a target and all its devices
 997  * @dev: generic starget or parent of generic stargets to be removed
 998  *
 999  * Note: This is slightly racy.  It is possible that if the user
1000  * requests the addition of another device then the target won't be
1001  * removed.
1002  */
1003 void scsi_remove_target(struct device *dev)
1004 {
1005         struct device *rdev;
1006
1007         if (scsi_is_target_device(dev)) {
1008                 __scsi_remove_target(to_scsi_target(dev));
1009                 return;
1010         }
1011
1012         rdev = get_device(dev);
1013         device_for_each_child(dev, NULL, __remove_child);
1014         put_device(rdev);
1015 }
1016 EXPORT_SYMBOL(scsi_remove_target);
1017
1018 int scsi_register_driver(struct device_driver *drv)
1019 {
1020         drv->bus = &scsi_bus_type;
1021
1022         return driver_register(drv);
1023 }
1024 EXPORT_SYMBOL(scsi_register_driver);
1025
1026 int scsi_register_interface(struct class_interface *intf)
1027 {
1028         intf->class = &sdev_class;
1029
1030         return class_interface_register(intf);
1031 }
1032 EXPORT_SYMBOL(scsi_register_interface);
1033
1034 /**
1035  * scsi_sysfs_add_host - add scsi host to subsystem
1036  * @shost:     scsi host struct to add to subsystem
1037  * @dev:       parent struct device pointer
1038  **/
1039 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1040 {
1041         int error, i;
1042
1043         /* add host specific attributes */
1044         if (shost->hostt->shost_attrs) {
1045                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1046                         error = device_create_file(&shost->shost_dev,
1047                                         shost->hostt->shost_attrs[i]);
1048                         if (error)
1049                                 return error;
1050                 }
1051         }
1052
1053         transport_register_device(&shost->shost_gendev);
1054         transport_configure_device(&shost->shost_gendev);
1055         return 0;
1056 }
1057
1058 static struct device_type scsi_dev_type = {
1059         .name =         "scsi_device",
1060         .release =      scsi_device_dev_release,
1061         .groups =       scsi_sdev_attr_groups,
1062 };
1063
1064 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1065 {
1066         unsigned long flags;
1067         struct Scsi_Host *shost = sdev->host;
1068         struct scsi_target  *starget = sdev->sdev_target;
1069
1070         device_initialize(&sdev->sdev_gendev);
1071         sdev->sdev_gendev.bus = &scsi_bus_type;
1072         sdev->sdev_gendev.type = &scsi_dev_type;
1073         sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d",
1074                 sdev->host->host_no, sdev->channel, sdev->id,
1075                 sdev->lun);
1076
1077         device_initialize(&sdev->sdev_dev);
1078         sdev->sdev_dev.parent = &sdev->sdev_gendev;
1079         sdev->sdev_dev.class = &sdev_class;
1080         snprintf(sdev->sdev_dev.bus_id, BUS_ID_SIZE,
1081                  "%d:%d:%d:%d", sdev->host->host_no,
1082                  sdev->channel, sdev->id, sdev->lun);
1083         sdev->scsi_level = starget->scsi_level;
1084         transport_setup_device(&sdev->sdev_gendev);
1085         spin_lock_irqsave(shost->host_lock, flags);
1086         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1087         list_add_tail(&sdev->siblings, &shost->__devices);
1088         spin_unlock_irqrestore(shost->host_lock, flags);
1089 }
1090
1091 int scsi_is_sdev_device(const struct device *dev)
1092 {
1093         return dev->type == &scsi_dev_type;
1094 }
1095 EXPORT_SYMBOL(scsi_is_sdev_device);
1096
1097 /* A blank transport template that is used in drivers that don't
1098  * yet implement Transport Attributes */
1099 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };