SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 device_attribute *scsi_sysfs_shost_attrs[] = {
 255         &dev_attr_unique_id,
 256         &dev_attr_host_busy,
 257         &dev_attr_cmd_per_lun,
 258         &dev_attr_can_queue,
 259         &dev_attr_sg_tablesize,
 260         &dev_attr_unchecked_isa_dma,
 261         &dev_attr_proc_name,
 262         &dev_attr_scan,
 263         &dev_attr_hstate,
 264         &dev_attr_supported_mode,
 265         &dev_attr_active_mode,
 266         NULL
 267 };
 268
 269 static void scsi_device_cls_release(struct device *class_dev)
 270 {
 271         struct scsi_device *sdev;
 272
 273         sdev = class_to_sdev(class_dev);
 274         put_device(&sdev->sdev_gendev);
 275 }
 276
 277 static void scsi_device_dev_release_usercontext(struct work_struct *work)
 278 {
 279         struct scsi_device *sdev;
 280         struct device *parent;
 281         struct scsi_target *starget;
 282         struct list_head *this, *tmp;
 283         unsigned long flags;
 284
 285         sdev = container_of(work, struct scsi_device, ew.work);
 286
 287         parent = sdev->sdev_gendev.parent;
 288         starget = to_scsi_target(parent);
 289
 290         spin_lock_irqsave(sdev->host->host_lock, flags);
 291         starget->reap_ref++;
 292         list_del(&sdev->siblings);
 293         list_del(&sdev->same_target_siblings);
 294         list_del(&sdev->starved_entry);
 295         spin_unlock_irqrestore(sdev->host->host_lock, flags);
 296
 297         cancel_work_sync(&sdev->event_work);
 298
 299         list_for_each_safe(this, tmp, &sdev->event_list) {
 300                 struct scsi_event *evt;
 301
 302                 evt = list_entry(this, struct scsi_event, node);
 303                 list_del(&evt->node);
 304                 kfree(evt);
 305         }
 306
 307         if (sdev->request_queue) {
 308                 sdev->request_queue->queuedata = NULL;
 309                 /* user context needed to free queue */
 310                 scsi_free_queue(sdev->request_queue);
 311                 /* temporary expedient, try to catch use of queue lock
 312                  * after free of sdev */
 313                 sdev->request_queue = NULL;
 314         }
 315
 316         scsi_target_reap(scsi_target(sdev));
 317
 318         kfree(sdev->inquiry);
 319         kfree(sdev);
 320
 321         if (parent)
 322                 put_device(parent);
 323 }
 324
 325 static void scsi_device_dev_release(struct device *dev)
 326 {
 327         struct scsi_device *sdp = to_scsi_device(dev);
 328         execute_in_process_context(scsi_device_dev_release_usercontext,
 329                                    &sdp->ew);
 330 }
 331
 332 static struct class sdev_class = {
 333         .name           = "scsi_device",
 334         .dev_release    = scsi_device_cls_release,
 335 };
 336
 337 /* all probing is done in the individual ->probe routines */
 338 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 339 {
 340         struct scsi_device *sdp;
 341
 342         if (dev->type != &scsi_dev_type)
 343                 return 0;
 344
 345         sdp = to_scsi_device(dev);
 346         if (sdp->no_uld_attach)
 347                 return 0;
 348         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 349 }
 350
 351 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 352 {
 353         struct scsi_device *sdev = to_scsi_device(dev);
 354
 355         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 356         return 0;
 357 }
 358
 359 static int scsi_bus_suspend(struct device * dev, pm_message_t state)
 360 {
 361         struct device_driver *drv;
 362         struct scsi_device *sdev;
 363         int err;
 364
 365         if (dev->type != &scsi_dev_type)
 366                 return 0;
 367
 368         drv = dev->driver;
 369         sdev = to_scsi_device(dev);
 370
 371         err = scsi_device_quiesce(sdev);
 372         if (err)
 373                 return err;
 374
 375         if (drv && drv->suspend) {
 376                 err = drv->suspend(dev, state);
 377                 if (err)
 378                         return err;
 379         }
 380
 381         return 0;
 382 }
 383
 384 static int scsi_bus_resume(struct device * dev)
 385 {
 386         struct device_driver *drv;
 387         struct scsi_device *sdev;
 388         int err = 0;
 389
 390         if (dev->type != &scsi_dev_type)
 391                 return 0;
 392
 393         drv = dev->driver;
 394         sdev = to_scsi_device(dev);
 395
 396         if (drv && drv->resume)
 397                 err = drv->resume(dev);
 398
 399         scsi_device_resume(sdev);
 400
 401         return err;
 402 }
 403
 404 static int scsi_bus_remove(struct device *dev)
 405 {
 406         struct device_driver *drv = dev->driver;
 407         struct scsi_device *sdev = to_scsi_device(dev);
 408         int err = 0;
 409
 410         /* reset the prep_fn back to the default since the
 411          * driver may have altered it and it's being removed */
 412         blk_queue_prep_rq(sdev->request_queue, scsi_prep_fn);
 413
 414         if (drv && drv->remove)
 415                 err = drv->remove(dev);
 416
 417         return 0;
 418 }
 419
 420 struct bus_type scsi_bus_type = {
 421         .name           = "scsi",
 422         .match          = scsi_bus_match,
 423         .uevent         = scsi_bus_uevent,
 424         .suspend        = scsi_bus_suspend,
 425         .resume         = scsi_bus_resume,
 426         .remove         = scsi_bus_remove,
 427 };
 428
 429 int scsi_sysfs_register(void)
 430 {
 431         int error;
 432
 433         error = bus_register(&scsi_bus_type);
 434         if (!error) {
 435                 error = class_register(&sdev_class);
 436                 if (error)
 437                         bus_unregister(&scsi_bus_type);
 438         }
 439
 440         return error;
 441 }
 442
 443 void scsi_sysfs_unregister(void)
 444 {
 445         class_unregister(&sdev_class);
 446         bus_unregister(&scsi_bus_type);
 447 }
 448
 449 /*
 450  * sdev_show_function: macro to create an attr function that can be used to
 451  * show a non-bit field.
 452  */
 453 #define sdev_show_function(field, format_string)                                \
 454 static ssize_t                                                          \
 455 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 456                    char *buf)                                           \
 457 {                                                                       \
 458         struct scsi_device *sdev;                                       \
 459         sdev = to_scsi_device(dev);                                     \
 460         return snprintf (buf, 20, format_string, sdev->field);          \
 461 }                                                                       \
 462
 463 /*
 464  * sdev_rd_attr: macro to create a function and attribute variable for a
 465  * read only field.
 466  */
 467 #define sdev_rd_attr(field, format_string)                              \
 468         sdev_show_function(field, format_string)                        \
 469 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 470
 471
 472 /*
 473  * sdev_rd_attr: create a function and attribute variable for a
 474  * read/write field.
 475  */
 476 #define sdev_rw_attr(field, format_string)                              \
 477         sdev_show_function(field, format_string)                                \
 478                                                                         \
 479 static ssize_t                                                          \
 480 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 481                     const char *buf, size_t count)                      \
 482 {                                                                       \
 483         struct scsi_device *sdev;                                       \
 484         sdev = to_scsi_device(dev);                                     \
 485         snscanf (buf, 20, format_string, &sdev->field);                 \
 486         return count;                                                   \
 487 }                                                                       \
 488 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 489
 490 /* Currently we don't export bit fields, but we might in future,
 491  * so leave this code in */
 492 #if 0
 493 /*
 494  * sdev_rd_attr: create a function and attribute variable for a
 495  * read/write bit field.
 496  */
 497 #define sdev_rw_attr_bit(field)                                         \
 498         sdev_show_function(field, "%d\n")                                       \
 499                                                                         \
 500 static ssize_t                                                          \
 501 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 502                     const char *buf, size_t count)                      \
 503 {                                                                       \
 504         int ret;                                                        \
 505         struct scsi_device *sdev;                                       \
 506         ret = scsi_sdev_check_buf_bit(buf);                             \
 507         if (ret >= 0)   {                                               \
 508                 sdev = to_scsi_device(dev);                             \
 509                 sdev->field = ret;                                      \
 510                 ret = count;                                            \
 511         }                                                               \
 512         return ret;                                                     \
 513 }                                                                       \
 514 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 515
 516 /*
 517  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 518  * else return -EINVAL.
 519  */
 520 static int scsi_sdev_check_buf_bit(const char *buf)
 521 {
 522         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 523                 if (buf[0] == '1')
 524                         return 1;
 525                 else if (buf[0] == '0')
 526                         return 0;
 527                 else
 528                         return -EINVAL;
 529         } else
 530                 return -EINVAL;
 531 }
 532 #endif
 533 /*
 534  * Create the actual show/store functions and data structures.
 535  */
 536 sdev_rd_attr (device_blocked, "%d\n");
 537 sdev_rd_attr (queue_depth, "%d\n");
 538 sdev_rd_attr (type, "%d\n");
 539 sdev_rd_attr (scsi_level, "%d\n");
 540 sdev_rd_attr (vendor, "%.8s\n");
 541 sdev_rd_attr (model, "%.16s\n");
 542 sdev_rd_attr (rev, "%.4s\n");
 543
 544 static ssize_t
 545 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 546 {
 547         struct scsi_device *sdev;
 548         sdev = to_scsi_device(dev);
 549         return snprintf (buf, 20, "%d\n", sdev->timeout / HZ);
 550 }
 551
 552 static ssize_t
 553 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 554                     const char *buf, size_t count)
 555 {
 556         struct scsi_device *sdev;
 557         int timeout;
 558         sdev = to_scsi_device(dev);
 559         sscanf (buf, "%d\n", &timeout);
 560         sdev->timeout = timeout * HZ;
 561         return count;
 562 }
 563 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 564
 565 static ssize_t
 566 store_rescan_field (struct device *dev, struct device_attribute *attr,
 567                     const char *buf, size_t count)
 568 {
 569         scsi_rescan_device(dev);
 570         return count;
 571 }
 572 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 573
 574 static void sdev_store_delete_callback(struct device *dev)
 575 {
 576         scsi_remove_device(to_scsi_device(dev));
 577 }
 578
 579 static ssize_t
 580 sdev_store_delete(struct device *dev, struct device_attribute *attr,
 581                   const char *buf, size_t count)
 582 {
 583         int rc;
 584
 585         /* An attribute cannot be unregistered by one of its own methods,
 586          * so we have to use this roundabout approach.
 587          */
 588         rc = device_schedule_callback(dev, sdev_store_delete_callback);
 589         if (rc)
 590                 count = rc;
 591         return count;
 592 };
 593 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 594
 595 static ssize_t
 596 store_state_field(struct device *dev, struct device_attribute *attr,
 597                   const char *buf, size_t count)
 598 {
 599         int i;
 600         struct scsi_device *sdev = to_scsi_device(dev);
 601         enum scsi_device_state state = 0;
 602
 603         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 604                 const int len = strlen(sdev_states[i].name);
 605                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 606                    buf[len] == '\n') {
 607                         state = sdev_states[i].value;
 608                         break;
 609                 }
 610         }
 611         if (!state)
 612                 return -EINVAL;
 613
 614         if (scsi_device_set_state(sdev, state))
 615                 return -EINVAL;
 616         return count;
 617 }
 618
 619 static ssize_t
 620 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 621 {
 622         struct scsi_device *sdev = to_scsi_device(dev);
 623         const char *name = scsi_device_state_name(sdev->sdev_state);
 624
 625         if (!name)
 626                 return -EINVAL;
 627
 628         return snprintf(buf, 20, "%s\n", name);
 629 }
 630
 631 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 632
 633 static ssize_t
 634 show_queue_type_field(struct device *dev, struct device_attribute *attr,
 635                       char *buf)
 636 {
 637         struct scsi_device *sdev = to_scsi_device(dev);
 638         const char *name = "none";
 639
 640         if (sdev->ordered_tags)
 641                 name = "ordered";
 642         else if (sdev->simple_tags)
 643                 name = "simple";
 644
 645         return snprintf(buf, 20, "%s\n", name);
 646 }
 647
 648 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
 649
 650 static ssize_t
 651 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,                              char *buf)
 652 {
 653         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 654 }
 655
 656 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 657
 658 #define show_sdev_iostat(field)                                         \
 659 static ssize_t                                                          \
 660 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
 661                     char *buf)                                          \
 662 {                                                                       \
 663         struct scsi_device *sdev = to_scsi_device(dev);                 \
 664         unsigned long long count = atomic_read(&sdev->field);           \
 665         return snprintf(buf, 20, "0x%llx\n", count);                    \
 666 }                                                                       \
 667 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 668
 669 show_sdev_iostat(iorequest_cnt);
 670 show_sdev_iostat(iodone_cnt);
 671 show_sdev_iostat(ioerr_cnt);
 672
 673 static ssize_t
 674 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 675 {
 676         struct scsi_device *sdev;
 677         sdev = to_scsi_device(dev);
 678         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 679 }
 680 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 681
 682 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
 683 static ssize_t                                                          \
 684 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
 685                      char *buf)                                         \
 686 {                                                                       \
 687         struct scsi_device *sdev = to_scsi_device(dev);                 \
 688         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 689         return snprintf(buf, 20, "%d\n", val);                          \
 690 }
 691
 692 #define DECLARE_EVT_STORE(name, Cap_name)                               \
 693 static ssize_t                                                          \
 694 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 695                       const char *buf, size_t count)                    \
 696 {                                                                       \
 697         struct scsi_device *sdev = to_scsi_device(dev);                 \
 698         int val = simple_strtoul(buf, NULL, 0);                         \
 699         if (val == 0)                                                   \
 700                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
 701         else if (val == 1)                                              \
 702                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
 703         else                                                            \
 704                 return -EINVAL;                                         \
 705         return count;                                                   \
 706 }
 707
 708 #define DECLARE_EVT(name, Cap_name)                                     \
 709         DECLARE_EVT_SHOW(name, Cap_name)                                \
 710         DECLARE_EVT_STORE(name, Cap_name)                               \
 711         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
 712                            sdev_store_evt_##name);
 713 #define REF_EVT(name) &dev_attr_evt_##name.attr
 714
 715 DECLARE_EVT(media_change, MEDIA_CHANGE)
 716
 717 /* Default template for device attributes.  May NOT be modified */
 718 static struct attribute *scsi_sdev_attrs[] = {
 719         &dev_attr_device_blocked.attr,
 720         &dev_attr_type.attr,
 721         &dev_attr_scsi_level.attr,
 722         &dev_attr_vendor.attr,
 723         &dev_attr_model.attr,
 724         &dev_attr_rev.attr,
 725         &dev_attr_rescan.attr,
 726         &dev_attr_delete.attr,
 727         &dev_attr_state.attr,
 728         &dev_attr_timeout.attr,
 729         &dev_attr_iocounterbits.attr,
 730         &dev_attr_iorequest_cnt.attr,
 731         &dev_attr_iodone_cnt.attr,
 732         &dev_attr_ioerr_cnt.attr,
 733         &dev_attr_modalias.attr,
 734         REF_EVT(media_change),
 735         NULL
 736 };
 737
 738 static struct attribute_group scsi_sdev_attr_group = {
 739         .attrs =        scsi_sdev_attrs,
 740 };
 741
 742 static struct attribute_group *scsi_sdev_attr_groups[] = {
 743         &scsi_sdev_attr_group,
 744         NULL
 745 };
 746
 747 static ssize_t
 748 sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
 749                           const char *buf, size_t count)
 750 {
 751         int depth, retval;
 752         struct scsi_device *sdev = to_scsi_device(dev);
 753         struct scsi_host_template *sht = sdev->host->hostt;
 754
 755         if (!sht->change_queue_depth)
 756                 return -EINVAL;
 757
 758         depth = simple_strtoul(buf, NULL, 0);
 759
 760         if (depth < 1)
 761                 return -EINVAL;
 762
 763         retval = sht->change_queue_depth(sdev, depth);
 764         if (retval < 0)
 765                 return retval;
 766
 767         return count;
 768 }
 769
 770 static struct device_attribute sdev_attr_queue_depth_rw =
 771         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 772                sdev_store_queue_depth_rw);
 773
 774 static ssize_t
 775 sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
 776                          const char *buf, size_t count)
 777 {
 778         struct scsi_device *sdev = to_scsi_device(dev);
 779         struct scsi_host_template *sht = sdev->host->hostt;
 780         int tag_type = 0, retval;
 781         int prev_tag_type = scsi_get_tag_type(sdev);
 782
 783         if (!sdev->tagged_supported || !sht->change_queue_type)
 784                 return -EINVAL;
 785
 786         if (strncmp(buf, "ordered", 7) == 0)
 787                 tag_type = MSG_ORDERED_TAG;
 788         else if (strncmp(buf, "simple", 6) == 0)
 789                 tag_type = MSG_SIMPLE_TAG;
 790         else if (strncmp(buf, "none", 4) != 0)
 791                 return -EINVAL;
 792
 793         if (tag_type == prev_tag_type)
 794                 return count;
 795
 796         retval = sht->change_queue_type(sdev, tag_type);
 797         if (retval < 0)
 798                 return retval;
 799
 800         return count;
 801 }
 802
 803 static struct device_attribute sdev_attr_queue_type_rw =
 804         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 805                sdev_store_queue_type_rw);
 806
 807 /**
 808  * scsi_sysfs_add_sdev - add scsi device to sysfs
 809  * @sdev:       scsi_device to add
 810  *
 811  * Return value:
 812  *      0 on Success / non-zero on Failure
 813  **/
 814 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 815 {
 816         int error, i;
 817         struct request_queue *rq = sdev->request_queue;
 818
 819         if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0)
 820                 return error;
 821
 822         error = device_add(&sdev->sdev_gendev);
 823         if (error) {
 824                 put_device(sdev->sdev_gendev.parent);
 825                 printk(KERN_INFO "error 1\n");
 826                 return error;
 827         }
 828         error = device_add(&sdev->sdev_dev);
 829         if (error) {
 830                 printk(KERN_INFO "error 2\n");
 831                 goto clean_device;
 832         }
 833
 834         /* take a reference for the sdev_dev; this is
 835          * released by the sdev_class .release */
 836         get_device(&sdev->sdev_gendev);
 837
 838         /* create queue files, which may be writable, depending on the host */
 839         if (sdev->host->hostt->change_queue_depth)
 840                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_depth_rw);
 841         else
 842                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
 843         if (error) {
 844                 __scsi_remove_device(sdev);
 845                 goto out;
 846         }
 847         if (sdev->host->hostt->change_queue_type)
 848                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
 849         else
 850                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
 851         if (error) {
 852                 __scsi_remove_device(sdev);
 853                 goto out;
 854         }
 855
 856         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL);
 857
 858         if (error)
 859                 sdev_printk(KERN_INFO, sdev,
 860                             "Failed to register bsg queue, errno=%d\n", error);
 861
 862         /* we're treating error on bsg register as non-fatal, so pretend
 863          * nothing went wrong */
 864         error = 0;
 865
 866         /* add additional host specific attributes */
 867         if (sdev->host->hostt->sdev_attrs) {
 868                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
 869                         error = device_create_file(&sdev->sdev_gendev,
 870                                         sdev->host->hostt->sdev_attrs[i]);
 871                         if (error) {
 872                                 __scsi_remove_device(sdev);
 873                                 goto out;
 874                         }
 875                 }
 876         }
 877
 878         transport_add_device(&sdev->sdev_gendev);
 879  out:
 880         return error;
 881
 882  clean_device:
 883         scsi_device_set_state(sdev, SDEV_CANCEL);
 884
 885         device_del(&sdev->sdev_gendev);
 886         transport_destroy_device(&sdev->sdev_gendev);
 887         put_device(&sdev->sdev_gendev);
 888
 889         return error;
 890 }
 891
 892 void __scsi_remove_device(struct scsi_device *sdev)
 893 {
 894         struct device *dev = &sdev->sdev_gendev;
 895
 896         if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
 897                 return;
 898
 899         bsg_unregister_queue(sdev->request_queue);
 900         device_unregister(&sdev->sdev_dev);
 901         transport_remove_device(dev);
 902         device_del(dev);
 903         scsi_device_set_state(sdev, SDEV_DEL);
 904         if (sdev->host->hostt->slave_destroy)
 905                 sdev->host->hostt->slave_destroy(sdev);
 906         transport_destroy_device(dev);
 907         put_device(dev);
 908 }
 909
 910 /**
 911  * scsi_remove_device - unregister a device from the scsi bus
 912  * @sdev:       scsi_device to unregister
 913  **/
 914 void scsi_remove_device(struct scsi_device *sdev)
 915 {
 916         struct Scsi_Host *shost = sdev->host;
 917
 918         mutex_lock(&shost->scan_mutex);
 919         __scsi_remove_device(sdev);
 920         mutex_unlock(&shost->scan_mutex);
 921 }
 922 EXPORT_SYMBOL(scsi_remove_device);
 923
 924 static void __scsi_remove_target(struct scsi_target *starget)
 925 {
 926         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 927         unsigned long flags;
 928         struct scsi_device *sdev;
 929
 930         spin_lock_irqsave(shost->host_lock, flags);
 931         starget->reap_ref++;
 932  restart:
 933         list_for_each_entry(sdev, &shost->__devices, siblings) {
 934                 if (sdev->channel != starget->channel ||
 935                     sdev->id != starget->id ||
 936                     sdev->sdev_state == SDEV_DEL)
 937                         continue;
 938                 spin_unlock_irqrestore(shost->host_lock, flags);
 939                 scsi_remove_device(sdev);
 940                 spin_lock_irqsave(shost->host_lock, flags);
 941                 goto restart;
 942         }
 943         spin_unlock_irqrestore(shost->host_lock, flags);
 944         scsi_target_reap(starget);
 945 }
 946
 947 static int __remove_child (struct device * dev, void * data)
 948 {
 949         if (scsi_is_target_device(dev))
 950                 __scsi_remove_target(to_scsi_target(dev));
 951         return 0;
 952 }
 953
 954 /**
 955  * scsi_remove_target - try to remove a target and all its devices
 956  * @dev: generic starget or parent of generic stargets to be removed
 957  *
 958  * Note: This is slightly racy.  It is possible that if the user
 959  * requests the addition of another device then the target won't be
 960  * removed.
 961  */
 962 void scsi_remove_target(struct device *dev)
 963 {
 964         struct device *rdev;
 965
 966         if (scsi_is_target_device(dev)) {
 967                 __scsi_remove_target(to_scsi_target(dev));
 968                 return;
 969         }
 970
 971         rdev = get_device(dev);
 972         device_for_each_child(dev, NULL, __remove_child);
 973         put_device(rdev);
 974 }
 975 EXPORT_SYMBOL(scsi_remove_target);
 976
 977 int scsi_register_driver(struct device_driver *drv)
 978 {
 979         drv->bus = &scsi_bus_type;
 980
 981         return driver_register(drv);
 982 }
 983 EXPORT_SYMBOL(scsi_register_driver);
 984
 985 int scsi_register_interface(struct class_interface *intf)
 986 {
 987         intf->class = &sdev_class;
 988
 989         return class_interface_register(intf);
 990 }
 991 EXPORT_SYMBOL(scsi_register_interface);
 992
 993
 994 static struct device_attribute *class_attr_overridden(
 995                 struct device_attribute **attrs,
 996                 struct device_attribute *attr)
 997 {
 998         int i;
 999
1000         if (!attrs)
1001                 return NULL;
1002         for (i = 0; attrs[i]; i++)
1003                 if (!strcmp(attrs[i]->attr.name, attr->attr.name))
1004                         return attrs[i];
1005         return NULL;
1006 }
1007
1008 static int class_attr_add(struct device *classdev,
1009                 struct device_attribute *attr)
1010 {
1011         struct device_attribute *base_attr;
1012
1013         /*
1014          * Spare the caller from having to copy things it's not interested in.
1015          */
1016         base_attr = class_attr_overridden(scsi_sysfs_shost_attrs, attr);
1017         if (base_attr) {
1018                 /* extend permissions */
1019                 attr->attr.mode |= base_attr->attr.mode;
1020
1021                 /* override null show/store with default */
1022                 if (!attr->show)
1023                         attr->show = base_attr->show;
1024                 if (!attr->store)
1025                         attr->store = base_attr->store;
1026         }
1027
1028         return device_create_file(classdev, attr);
1029 }
1030
1031 /**
1032  * scsi_sysfs_add_host - add scsi host to subsystem
1033  * @shost:     scsi host struct to add to subsystem
1034  * @dev:       parent struct device pointer
1035  **/
1036 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1037 {
1038         int error, i;
1039
1040         if (shost->hostt->shost_attrs) {
1041                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1042                         error = class_attr_add(&shost->shost_dev,
1043                                         shost->hostt->shost_attrs[i]);
1044                         if (error)
1045                                 return error;
1046                 }
1047         }
1048
1049         for (i = 0; scsi_sysfs_shost_attrs[i]; i++) {
1050                 if (!class_attr_overridden(shost->hostt->shost_attrs,
1051                                         scsi_sysfs_shost_attrs[i])) {
1052                         error = device_create_file(&shost->shost_dev,
1053                                         scsi_sysfs_shost_attrs[i]);
1054                         if (error)
1055                                 return error;
1056                 }
1057         }
1058
1059         transport_register_device(&shost->shost_gendev);
1060         transport_configure_device(&shost->shost_gendev);
1061         return 0;
1062 }
1063
1064 static struct device_type scsi_dev_type = {
1065         .name =         "scsi_device",
1066         .release =      scsi_device_dev_release,
1067         .groups =       scsi_sdev_attr_groups,
1068 };
1069
1070 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1071 {
1072         unsigned long flags;
1073         struct Scsi_Host *shost = sdev->host;
1074         struct scsi_target  *starget = sdev->sdev_target;
1075
1076         device_initialize(&sdev->sdev_gendev);
1077         sdev->sdev_gendev.bus = &scsi_bus_type;
1078         sdev->sdev_gendev.type = &scsi_dev_type;
1079         sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d",
1080                 sdev->host->host_no, sdev->channel, sdev->id,
1081                 sdev->lun);
1082
1083         device_initialize(&sdev->sdev_dev);
1084         sdev->sdev_dev.parent = &sdev->sdev_gendev;
1085         sdev->sdev_dev.class = &sdev_class;
1086         snprintf(sdev->sdev_dev.bus_id, BUS_ID_SIZE,
1087                  "%d:%d:%d:%d", sdev->host->host_no,
1088                  sdev->channel, sdev->id, sdev->lun);
1089         sdev->scsi_level = starget->scsi_level;
1090         transport_setup_device(&sdev->sdev_gendev);
1091         spin_lock_irqsave(shost->host_lock, flags);
1092         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1093         list_add_tail(&sdev->siblings, &shost->__devices);
1094         spin_unlock_irqrestore(shost->host_lock, flags);
1095 }
1096
1097 int scsi_is_sdev_device(const struct device *dev)
1098 {
1099         return dev->type == &scsi_dev_type;
1100 }
1101 EXPORT_SYMBOL(scsi_is_sdev_device);
1102
1103 /* A blank transport template that is used in drivers that don't
1104  * yet implement Transport Attributes */
1105 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };