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
  20 #include "scsi_priv.h"
  21 #include "scsi_logging.h"
  22
  23 static const struct {
  24         enum scsi_device_state  value;
  25         char                    *name;
  26 } sdev_states[] = {
  27         { SDEV_CREATED, "created" },
  28         { SDEV_RUNNING, "running" },
  29         { SDEV_CANCEL, "cancel" },
  30         { SDEV_DEL, "deleted" },
  31         { SDEV_QUIESCE, "quiesce" },
  32         { SDEV_OFFLINE, "offline" },
  33         { SDEV_BLOCK,   "blocked" },
  34 };
  35
  36 const char *scsi_device_state_name(enum scsi_device_state state)
  37 {
  38         int i;
  39         char *name = NULL;
  40
  41         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
  42                 if (sdev_states[i].value == state) {
  43                         name = sdev_states[i].name;
  44                         break;
  45                 }
  46         }
  47         return name;
  48 }
  49
  50 static const struct {
  51         enum scsi_host_state    value;
  52         char                    *name;
  53 } shost_states[] = {
  54         { SHOST_CREATED, "created" },
  55         { SHOST_RUNNING, "running" },
  56         { SHOST_CANCEL, "cancel" },
  57         { SHOST_DEL, "deleted" },
  58         { SHOST_RECOVERY, "recovery" },
  59         { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
  60         { SHOST_DEL_RECOVERY, "deleted/recovery", },
  61 };
  62 const char *scsi_host_state_name(enum scsi_host_state state)
  63 {
  64         int i;
  65         char *name = NULL;
  66
  67         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
  68                 if (shost_states[i].value == state) {
  69                         name = shost_states[i].name;
  70                         break;
  71                 }
  72         }
  73         return name;
  74 }
  75
  76 static int check_set(unsigned int *val, char *src)
  77 {
  78         char *last;
  79
  80         if (strncmp(src, "-", 20) == 0) {
  81                 *val = SCAN_WILD_CARD;
  82         } else {
  83                 /*
  84                  * Doesn't check for int overflow
  85                  */
  86                 *val = simple_strtoul(src, &last, 0);
  87                 if (*last != '\0')
  88                         return 1;
  89         }
  90         return 0;
  91 }
  92
  93 static int scsi_scan(struct Scsi_Host *shost, const char *str)
  94 {
  95         char s1[15], s2[15], s3[15], junk;
  96         unsigned int channel, id, lun;
  97         int res;
  98
  99         res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk);
 100         if (res != 3)
 101                 return -EINVAL;
 102         if (check_set(&channel, s1))
 103                 return -EINVAL;
 104         if (check_set(&id, s2))
 105                 return -EINVAL;
 106         if (check_set(&lun, s3))
 107                 return -EINVAL;
 108         if (shost->transportt->user_scan)
 109                 res = shost->transportt->user_scan(shost, channel, id, lun);
 110         else
 111                 res = scsi_scan_host_selected(shost, channel, id, lun, 1);
 112         return res;
 113 }
 114
 115 /*
 116  * shost_show_function: macro to create an attr function that can be used to
 117  * show a non-bit field.
 118  */
 119 #define shost_show_function(name, field, format_string)                 \
 120 static ssize_t                                                          \
 121 show_##name (struct class_device *class_dev, char *buf)                 \
 122 {                                                                       \
 123         struct Scsi_Host *shost = class_to_shost(class_dev);            \
 124         return snprintf (buf, 20, format_string, shost->field);         \
 125 }
 126
 127 /*
 128  * shost_rd_attr: macro to create a function and attribute variable for a
 129  * read only field.
 130  */
 131 #define shost_rd_attr2(name, field, format_string)                      \
 132         shost_show_function(name, field, format_string)                 \
 133 static CLASS_DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
 134
 135 #define shost_rd_attr(field, format_string) \
 136 shost_rd_attr2(field, field, format_string)
 137
 138 /*
 139  * Create the actual show/store functions and data structures.
 140  */
 141
 142 static ssize_t store_scan(struct class_device *class_dev, const char *buf,
 143                           size_t count)
 144 {
 145         struct Scsi_Host *shost = class_to_shost(class_dev);
 146         int res;
 147
 148         res = scsi_scan(shost, buf);
 149         if (res == 0)
 150                 res = count;
 151         return res;
 152 };
 153 static CLASS_DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
 154
 155 static ssize_t
 156 store_shost_state(struct class_device *class_dev, const char *buf, size_t count)
 157 {
 158         int i;
 159         struct Scsi_Host *shost = class_to_shost(class_dev);
 160         enum scsi_host_state state = 0;
 161
 162         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
 163                 const int len = strlen(shost_states[i].name);
 164                 if (strncmp(shost_states[i].name, buf, len) == 0 &&
 165                    buf[len] == '\n') {
 166                         state = shost_states[i].value;
 167                         break;
 168                 }
 169         }
 170         if (!state)
 171                 return -EINVAL;
 172
 173         if (scsi_host_set_state(shost, state))
 174                 return -EINVAL;
 175         return count;
 176 }
 177
 178 static ssize_t
 179 show_shost_state(struct class_device *class_dev, char *buf)
 180 {
 181         struct Scsi_Host *shost = class_to_shost(class_dev);
 182         const char *name = scsi_host_state_name(shost->shost_state);
 183
 184         if (!name)
 185                 return -EINVAL;
 186
 187         return snprintf(buf, 20, "%s\n", name);
 188 }
 189
 190 static CLASS_DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
 191
 192 shost_rd_attr(unique_id, "%u\n");
 193 shost_rd_attr(host_busy, "%hu\n");
 194 shost_rd_attr(cmd_per_lun, "%hd\n");
 195 shost_rd_attr(can_queue, "%hd\n");
 196 shost_rd_attr(sg_tablesize, "%hu\n");
 197 shost_rd_attr(unchecked_isa_dma, "%d\n");
 198 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
 199
 200 static struct class_device_attribute *scsi_sysfs_shost_attrs[] = {
 201         &class_device_attr_unique_id,
 202         &class_device_attr_host_busy,
 203         &class_device_attr_cmd_per_lun,
 204         &class_device_attr_can_queue,
 205         &class_device_attr_sg_tablesize,
 206         &class_device_attr_unchecked_isa_dma,
 207         &class_device_attr_proc_name,
 208         &class_device_attr_scan,
 209         &class_device_attr_state,
 210         NULL
 211 };
 212
 213 static void scsi_device_cls_release(struct class_device *class_dev)
 214 {
 215         struct scsi_device *sdev;
 216
 217         sdev = class_to_sdev(class_dev);
 218         put_device(&sdev->sdev_gendev);
 219 }
 220
 221 static void scsi_device_dev_release_usercontext(struct work_struct *work)
 222 {
 223         struct scsi_device *sdev;
 224         struct device *parent;
 225         struct scsi_target *starget;
 226         unsigned long flags;
 227
 228         sdev = container_of(work, struct scsi_device, ew.work);
 229
 230         parent = sdev->sdev_gendev.parent;
 231         starget = to_scsi_target(parent);
 232
 233         spin_lock_irqsave(sdev->host->host_lock, flags);
 234         starget->reap_ref++;
 235         list_del(&sdev->siblings);
 236         list_del(&sdev->same_target_siblings);
 237         list_del(&sdev->starved_entry);
 238         spin_unlock_irqrestore(sdev->host->host_lock, flags);
 239
 240         if (sdev->request_queue) {
 241                 sdev->request_queue->queuedata = NULL;
 242                 /* user context needed to free queue */
 243                 scsi_free_queue(sdev->request_queue);
 244                 /* temporary expedient, try to catch use of queue lock
 245                  * after free of sdev */
 246                 sdev->request_queue = NULL;
 247         }
 248
 249         scsi_target_reap(scsi_target(sdev));
 250
 251         kfree(sdev->inquiry);
 252         kfree(sdev);
 253
 254         if (parent)
 255                 put_device(parent);
 256 }
 257
 258 static void scsi_device_dev_release(struct device *dev)
 259 {
 260         struct scsi_device *sdp = to_scsi_device(dev);
 261         execute_in_process_context(scsi_device_dev_release_usercontext,
 262                                    &sdp->ew);
 263 }
 264
 265 static struct class sdev_class = {
 266         .name           = "scsi_device",
 267         .release        = scsi_device_cls_release,
 268 };
 269
 270 /* all probing is done in the individual ->probe routines */
 271 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 272 {
 273         struct scsi_device *sdp = to_scsi_device(dev);
 274         if (sdp->no_uld_attach)
 275                 return 0;
 276         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 277 }
 278
 279 static int scsi_bus_uevent(struct device *dev, char **envp, int num_envp,
 280                            char *buffer, int buffer_size)
 281 {
 282         struct scsi_device *sdev = to_scsi_device(dev);
 283         int i = 0;
 284         int length = 0;
 285
 286         add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length,
 287                        "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 288         envp[i] = NULL;
 289         return 0;
 290 }
 291
 292 static int scsi_bus_suspend(struct device * dev, pm_message_t state)
 293 {
 294         struct device_driver *drv = dev->driver;
 295         struct scsi_device *sdev = to_scsi_device(dev);
 296         struct scsi_host_template *sht = sdev->host->hostt;
 297         int err;
 298
 299         err = scsi_device_quiesce(sdev);
 300         if (err)
 301                 return err;
 302
 303         /* call HLD suspend first */
 304         if (drv && drv->suspend) {
 305                 err = drv->suspend(dev, state);
 306                 if (err)
 307                         return err;
 308         }
 309
 310         /* then, call host suspend */
 311         if (sht->suspend) {
 312                 err = sht->suspend(sdev, state);
 313                 if (err) {
 314                         if (drv && drv->resume)
 315                                 drv->resume(dev);
 316                         return err;
 317                 }
 318         }
 319
 320         return 0;
 321 }
 322
 323 static int scsi_bus_resume(struct device * dev)
 324 {
 325         struct device_driver *drv = dev->driver;
 326         struct scsi_device *sdev = to_scsi_device(dev);
 327         struct scsi_host_template *sht = sdev->host->hostt;
 328         int err = 0, err2 = 0;
 329
 330         /* call host resume first */
 331         if (sht->resume)
 332                 err = sht->resume(sdev);
 333
 334         /* then, call HLD resume */
 335         if (drv && drv->resume)
 336                 err2 = drv->resume(dev);
 337
 338         scsi_device_resume(sdev);
 339
 340         /* favor LLD failure */
 341         return err ? err : err2;;
 342 }
 343
 344 struct bus_type scsi_bus_type = {
 345         .name           = "scsi",
 346         .match          = scsi_bus_match,
 347         .uevent         = scsi_bus_uevent,
 348         .suspend        = scsi_bus_suspend,
 349         .resume         = scsi_bus_resume,
 350 };
 351
 352 int scsi_sysfs_register(void)
 353 {
 354         int error;
 355
 356         error = bus_register(&scsi_bus_type);
 357         if (!error) {
 358                 error = class_register(&sdev_class);
 359                 if (error)
 360                         bus_unregister(&scsi_bus_type);
 361         }
 362
 363         return error;
 364 }
 365
 366 void scsi_sysfs_unregister(void)
 367 {
 368         class_unregister(&sdev_class);
 369         bus_unregister(&scsi_bus_type);
 370 }
 371
 372 /*
 373  * sdev_show_function: macro to create an attr function that can be used to
 374  * show a non-bit field.
 375  */
 376 #define sdev_show_function(field, format_string)                                \
 377 static ssize_t                                                          \
 378 sdev_show_##field (struct device *dev, struct device_attribute *attr, char *buf)                                \
 379 {                                                                       \
 380         struct scsi_device *sdev;                                       \
 381         sdev = to_scsi_device(dev);                                     \
 382         return snprintf (buf, 20, format_string, sdev->field);          \
 383 }                                                                       \
 384
 385 /*
 386  * sdev_rd_attr: macro to create a function and attribute variable for a
 387  * read only field.
 388  */
 389 #define sdev_rd_attr(field, format_string)                              \
 390         sdev_show_function(field, format_string)                        \
 391 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 392
 393
 394 /*
 395  * sdev_rd_attr: create a function and attribute variable for a
 396  * read/write field.
 397  */
 398 #define sdev_rw_attr(field, format_string)                              \
 399         sdev_show_function(field, format_string)                                \
 400                                                                         \
 401 static ssize_t                                                          \
 402 sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)   \
 403 {                                                                       \
 404         struct scsi_device *sdev;                                       \
 405         sdev = to_scsi_device(dev);                                     \
 406         snscanf (buf, 20, format_string, &sdev->field);                 \
 407         return count;                                                   \
 408 }                                                                       \
 409 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 410
 411 /* Currently we don't export bit fields, but we might in future,
 412  * so leave this code in */
 413 #if 0
 414 /*
 415  * sdev_rd_attr: create a function and attribute variable for a
 416  * read/write bit field.
 417  */
 418 #define sdev_rw_attr_bit(field)                                         \
 419         sdev_show_function(field, "%d\n")                                       \
 420                                                                         \
 421 static ssize_t                                                          \
 422 sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)   \
 423 {                                                                       \
 424         int ret;                                                        \
 425         struct scsi_device *sdev;                                       \
 426         ret = scsi_sdev_check_buf_bit(buf);                             \
 427         if (ret >= 0)   {                                               \
 428                 sdev = to_scsi_device(dev);                             \
 429                 sdev->field = ret;                                      \
 430                 ret = count;                                            \
 431         }                                                               \
 432         return ret;                                                     \
 433 }                                                                       \
 434 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 435
 436 /*
 437  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 438  * else return -EINVAL.
 439  */
 440 static int scsi_sdev_check_buf_bit(const char *buf)
 441 {
 442         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 443                 if (buf[0] == '1')
 444                         return 1;
 445                 else if (buf[0] == '0')
 446                         return 0;
 447                 else
 448                         return -EINVAL;
 449         } else
 450                 return -EINVAL;
 451 }
 452 #endif
 453 /*
 454  * Create the actual show/store functions and data structures.
 455  */
 456 sdev_rd_attr (device_blocked, "%d\n");
 457 sdev_rd_attr (queue_depth, "%d\n");
 458 sdev_rd_attr (type, "%d\n");
 459 sdev_rd_attr (scsi_level, "%d\n");
 460 sdev_rd_attr (vendor, "%.8s\n");
 461 sdev_rd_attr (model, "%.16s\n");
 462 sdev_rd_attr (rev, "%.4s\n");
 463
 464 static ssize_t
 465 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 466 {
 467         struct scsi_device *sdev;
 468         sdev = to_scsi_device(dev);
 469         return snprintf (buf, 20, "%d\n", sdev->timeout / HZ);
 470 }
 471
 472 static ssize_t
 473 sdev_store_timeout (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 474 {
 475         struct scsi_device *sdev;
 476         int timeout;
 477         sdev = to_scsi_device(dev);
 478         sscanf (buf, "%d\n", &timeout);
 479         sdev->timeout = timeout * HZ;
 480         return count;
 481 }
 482 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 483
 484 static ssize_t
 485 store_rescan_field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 486 {
 487         scsi_rescan_device(dev);
 488         return count;
 489 }
 490 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 491
 492 static void sdev_store_delete_callback(struct device *dev)
 493 {
 494         scsi_remove_device(to_scsi_device(dev));
 495 }
 496
 497 static ssize_t sdev_store_delete(struct device *dev, struct device_attribute *attr, const char *buf,
 498                                  size_t count)
 499 {
 500         int rc;
 501
 502         /* An attribute cannot be unregistered by one of its own methods,
 503          * so we have to use this roundabout approach.
 504          */
 505         rc = device_schedule_callback(dev, sdev_store_delete_callback);
 506         if (rc)
 507                 count = rc;
 508         return count;
 509 };
 510 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 511
 512 static ssize_t
 513 store_state_field(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 514 {
 515         int i;
 516         struct scsi_device *sdev = to_scsi_device(dev);
 517         enum scsi_device_state state = 0;
 518
 519         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 520                 const int len = strlen(sdev_states[i].name);
 521                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 522                    buf[len] == '\n') {
 523                         state = sdev_states[i].value;
 524                         break;
 525                 }
 526         }
 527         if (!state)
 528                 return -EINVAL;
 529
 530         if (scsi_device_set_state(sdev, state))
 531                 return -EINVAL;
 532         return count;
 533 }
 534
 535 static ssize_t
 536 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 537 {
 538         struct scsi_device *sdev = to_scsi_device(dev);
 539         const char *name = scsi_device_state_name(sdev->sdev_state);
 540
 541         if (!name)
 542                 return -EINVAL;
 543
 544         return snprintf(buf, 20, "%s\n", name);
 545 }
 546
 547 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 548
 549 static ssize_t
 550 show_queue_type_field(struct device *dev, struct device_attribute *attr, char *buf)
 551 {
 552         struct scsi_device *sdev = to_scsi_device(dev);
 553         const char *name = "none";
 554
 555         if (sdev->ordered_tags)
 556                 name = "ordered";
 557         else if (sdev->simple_tags)
 558                 name = "simple";
 559
 560         return snprintf(buf, 20, "%s\n", name);
 561 }
 562
 563 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
 564
 565 static ssize_t
 566 show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf)
 567 {
 568         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 569 }
 570
 571 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 572
 573 #define show_sdev_iostat(field)                                         \
 574 static ssize_t                                                          \
 575 show_iostat_##field(struct device *dev, struct device_attribute *attr, char *buf)                       \
 576 {                                                                       \
 577         struct scsi_device *sdev = to_scsi_device(dev);                 \
 578         unsigned long long count = atomic_read(&sdev->field);           \
 579         return snprintf(buf, 20, "0x%llx\n", count);                    \
 580 }                                                                       \
 581 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 582
 583 show_sdev_iostat(iorequest_cnt);
 584 show_sdev_iostat(iodone_cnt);
 585 show_sdev_iostat(ioerr_cnt);
 586
 587 static ssize_t
 588 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 589 {
 590         struct scsi_device *sdev;
 591         sdev = to_scsi_device(dev);
 592         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 593 }
 594 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 595
 596 /* Default template for device attributes.  May NOT be modified */
 597 static struct device_attribute *scsi_sysfs_sdev_attrs[] = {
 598         &dev_attr_device_blocked,
 599         &dev_attr_queue_depth,
 600         &dev_attr_queue_type,
 601         &dev_attr_type,
 602         &dev_attr_scsi_level,
 603         &dev_attr_vendor,
 604         &dev_attr_model,
 605         &dev_attr_rev,
 606         &dev_attr_rescan,
 607         &dev_attr_delete,
 608         &dev_attr_state,
 609         &dev_attr_timeout,
 610         &dev_attr_iocounterbits,
 611         &dev_attr_iorequest_cnt,
 612         &dev_attr_iodone_cnt,
 613         &dev_attr_ioerr_cnt,
 614         &dev_attr_modalias,
 615         NULL
 616 };
 617
 618 static ssize_t sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr, const char *buf,
 619                                          size_t count)
 620 {
 621         int depth, retval;
 622         struct scsi_device *sdev = to_scsi_device(dev);
 623         struct scsi_host_template *sht = sdev->host->hostt;
 624
 625         if (!sht->change_queue_depth)
 626                 return -EINVAL;
 627
 628         depth = simple_strtoul(buf, NULL, 0);
 629
 630         if (depth < 1)
 631                 return -EINVAL;
 632
 633         retval = sht->change_queue_depth(sdev, depth);
 634         if (retval < 0)
 635                 return retval;
 636
 637         return count;
 638 }
 639
 640 static struct device_attribute sdev_attr_queue_depth_rw =
 641         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 642                sdev_store_queue_depth_rw);
 643
 644 static ssize_t sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr, const char *buf,
 645                                         size_t count)
 646 {
 647         struct scsi_device *sdev = to_scsi_device(dev);
 648         struct scsi_host_template *sht = sdev->host->hostt;
 649         int tag_type = 0, retval;
 650         int prev_tag_type = scsi_get_tag_type(sdev);
 651
 652         if (!sdev->tagged_supported || !sht->change_queue_type)
 653                 return -EINVAL;
 654
 655         if (strncmp(buf, "ordered", 7) == 0)
 656                 tag_type = MSG_ORDERED_TAG;
 657         else if (strncmp(buf, "simple", 6) == 0)
 658                 tag_type = MSG_SIMPLE_TAG;
 659         else if (strncmp(buf, "none", 4) != 0)
 660                 return -EINVAL;
 661
 662         if (tag_type == prev_tag_type)
 663                 return count;
 664
 665         retval = sht->change_queue_type(sdev, tag_type);
 666         if (retval < 0)
 667                 return retval;
 668
 669         return count;
 670 }
 671
 672 static struct device_attribute sdev_attr_queue_type_rw =
 673         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 674                sdev_store_queue_type_rw);
 675
 676 static struct device_attribute *attr_changed_internally(
 677                 struct Scsi_Host *shost,
 678                 struct device_attribute * attr)
 679 {
 680         if (!strcmp("queue_depth", attr->attr.name)
 681             && shost->hostt->change_queue_depth)
 682                 return &sdev_attr_queue_depth_rw;
 683         else if (!strcmp("queue_type", attr->attr.name)
 684             && shost->hostt->change_queue_type)
 685                 return &sdev_attr_queue_type_rw;
 686         return attr;
 687 }
 688
 689
 690 static struct device_attribute *attr_overridden(
 691                 struct device_attribute **attrs,
 692                 struct device_attribute *attr)
 693 {
 694         int i;
 695
 696         if (!attrs)
 697                 return NULL;
 698         for (i = 0; attrs[i]; i++)
 699                 if (!strcmp(attrs[i]->attr.name, attr->attr.name))
 700                         return attrs[i];
 701         return NULL;
 702 }
 703
 704 static int attr_add(struct device *dev, struct device_attribute *attr)
 705 {
 706         struct device_attribute *base_attr;
 707
 708         /*
 709          * Spare the caller from having to copy things it's not interested in.
 710          */
 711         base_attr = attr_overridden(scsi_sysfs_sdev_attrs, attr);
 712         if (base_attr) {
 713                 /* extend permissions */
 714                 attr->attr.mode |= base_attr->attr.mode;
 715
 716                 /* override null show/store with default */
 717                 if (!attr->show)
 718                         attr->show = base_attr->show;
 719                 if (!attr->store)
 720                         attr->store = base_attr->store;
 721         }
 722
 723         return device_create_file(dev, attr);
 724 }
 725
 726 /**
 727  * scsi_sysfs_add_sdev - add scsi device to sysfs
 728  * @sdev:       scsi_device to add
 729  *
 730  * Return value:
 731  *      0 on Success / non-zero on Failure
 732  **/
 733 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 734 {
 735         int error, i;
 736
 737         if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0)
 738                 return error;
 739
 740         error = device_add(&sdev->sdev_gendev);
 741         if (error) {
 742                 put_device(sdev->sdev_gendev.parent);
 743                 printk(KERN_INFO "error 1\n");
 744                 return error;
 745         }
 746         error = class_device_add(&sdev->sdev_classdev);
 747         if (error) {
 748                 printk(KERN_INFO "error 2\n");
 749                 goto clean_device;
 750         }
 751
 752         /* take a reference for the sdev_classdev; this is
 753          * released by the sdev_class .release */
 754         get_device(&sdev->sdev_gendev);
 755         if (sdev->host->hostt->sdev_attrs) {
 756                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
 757                         error = attr_add(&sdev->sdev_gendev,
 758                                         sdev->host->hostt->sdev_attrs[i]);
 759                         if (error) {
 760                                 __scsi_remove_device(sdev);
 761                                 goto out;
 762                         }
 763                 }
 764         }
 765
 766         for (i = 0; scsi_sysfs_sdev_attrs[i]; i++) {
 767                 if (!attr_overridden(sdev->host->hostt->sdev_attrs,
 768                                         scsi_sysfs_sdev_attrs[i])) {
 769                         struct device_attribute * attr =
 770                                 attr_changed_internally(sdev->host,
 771                                                         scsi_sysfs_sdev_attrs[i]);
 772                         error = device_create_file(&sdev->sdev_gendev, attr);
 773                         if (error) {
 774                                 __scsi_remove_device(sdev);
 775                                 goto out;
 776                         }
 777                 }
 778         }
 779
 780         transport_add_device(&sdev->sdev_gendev);
 781  out:
 782         return error;
 783
 784  clean_device:
 785         scsi_device_set_state(sdev, SDEV_CANCEL);
 786
 787         device_del(&sdev->sdev_gendev);
 788         transport_destroy_device(&sdev->sdev_gendev);
 789         put_device(&sdev->sdev_gendev);
 790
 791         return error;
 792 }
 793
 794 void __scsi_remove_device(struct scsi_device *sdev)
 795 {
 796         struct device *dev = &sdev->sdev_gendev;
 797
 798         if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
 799                 return;
 800
 801         class_device_unregister(&sdev->sdev_classdev);
 802         transport_remove_device(dev);
 803         device_del(dev);
 804         scsi_device_set_state(sdev, SDEV_DEL);
 805         if (sdev->host->hostt->slave_destroy)
 806                 sdev->host->hostt->slave_destroy(sdev);
 807         transport_destroy_device(dev);
 808         put_device(dev);
 809 }
 810
 811 /**
 812  * scsi_remove_device - unregister a device from the scsi bus
 813  * @sdev:       scsi_device to unregister
 814  **/
 815 void scsi_remove_device(struct scsi_device *sdev)
 816 {
 817         struct Scsi_Host *shost = sdev->host;
 818
 819         mutex_lock(&shost->scan_mutex);
 820         __scsi_remove_device(sdev);
 821         mutex_unlock(&shost->scan_mutex);
 822 }
 823 EXPORT_SYMBOL(scsi_remove_device);
 824
 825 void __scsi_remove_target(struct scsi_target *starget)
 826 {
 827         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 828         unsigned long flags;
 829         struct scsi_device *sdev;
 830
 831         spin_lock_irqsave(shost->host_lock, flags);
 832         starget->reap_ref++;
 833  restart:
 834         list_for_each_entry(sdev, &shost->__devices, siblings) {
 835                 if (sdev->channel != starget->channel ||
 836                     sdev->id != starget->id ||
 837                     sdev->sdev_state == SDEV_DEL)
 838                         continue;
 839                 spin_unlock_irqrestore(shost->host_lock, flags);
 840                 scsi_remove_device(sdev);
 841                 spin_lock_irqsave(shost->host_lock, flags);
 842                 goto restart;
 843         }
 844         spin_unlock_irqrestore(shost->host_lock, flags);
 845         scsi_target_reap(starget);
 846 }
 847
 848 static int __remove_child (struct device * dev, void * data)
 849 {
 850         if (scsi_is_target_device(dev))
 851                 __scsi_remove_target(to_scsi_target(dev));
 852         return 0;
 853 }
 854
 855 /**
 856  * scsi_remove_target - try to remove a target and all its devices
 857  * @dev: generic starget or parent of generic stargets to be removed
 858  *
 859  * Note: This is slightly racy.  It is possible that if the user
 860  * requests the addition of another device then the target won't be
 861  * removed.
 862  */
 863 void scsi_remove_target(struct device *dev)
 864 {
 865         struct device *rdev;
 866
 867         if (scsi_is_target_device(dev)) {
 868                 __scsi_remove_target(to_scsi_target(dev));
 869                 return;
 870         }
 871
 872         rdev = get_device(dev);
 873         device_for_each_child(dev, NULL, __remove_child);
 874         put_device(rdev);
 875 }
 876 EXPORT_SYMBOL(scsi_remove_target);
 877
 878 int scsi_register_driver(struct device_driver *drv)
 879 {
 880         drv->bus = &scsi_bus_type;
 881
 882         return driver_register(drv);
 883 }
 884 EXPORT_SYMBOL(scsi_register_driver);
 885
 886 int scsi_register_interface(struct class_interface *intf)
 887 {
 888         intf->class = &sdev_class;
 889
 890         return class_interface_register(intf);
 891 }
 892 EXPORT_SYMBOL(scsi_register_interface);
 893
 894
 895 static struct class_device_attribute *class_attr_overridden(
 896                 struct class_device_attribute **attrs,
 897                 struct class_device_attribute *attr)
 898 {
 899         int i;
 900
 901         if (!attrs)
 902                 return NULL;
 903         for (i = 0; attrs[i]; i++)
 904                 if (!strcmp(attrs[i]->attr.name, attr->attr.name))
 905                         return attrs[i];
 906         return NULL;
 907 }
 908
 909 static int class_attr_add(struct class_device *classdev,
 910                 struct class_device_attribute *attr)
 911 {
 912         struct class_device_attribute *base_attr;
 913
 914         /*
 915          * Spare the caller from having to copy things it's not interested in.
 916          */
 917         base_attr = class_attr_overridden(scsi_sysfs_shost_attrs, attr);
 918         if (base_attr) {
 919                 /* extend permissions */
 920                 attr->attr.mode |= base_attr->attr.mode;
 921
 922                 /* override null show/store with default */
 923                 if (!attr->show)
 924                         attr->show = base_attr->show;
 925                 if (!attr->store)
 926                         attr->store = base_attr->store;
 927         }
 928
 929         return class_device_create_file(classdev, attr);
 930 }
 931
 932 /**
 933  * scsi_sysfs_add_host - add scsi host to subsystem
 934  * @shost:     scsi host struct to add to subsystem
 935  * @dev:       parent struct device pointer
 936  **/
 937 int scsi_sysfs_add_host(struct Scsi_Host *shost)
 938 {
 939         int error, i;
 940
 941         if (shost->hostt->shost_attrs) {
 942                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
 943                         error = class_attr_add(&shost->shost_classdev,
 944                                         shost->hostt->shost_attrs[i]);
 945                         if (error)
 946                                 return error;
 947                 }
 948         }
 949
 950         for (i = 0; scsi_sysfs_shost_attrs[i]; i++) {
 951                 if (!class_attr_overridden(shost->hostt->shost_attrs,
 952                                         scsi_sysfs_shost_attrs[i])) {
 953                         error = class_device_create_file(&shost->shost_classdev,
 954                                         scsi_sysfs_shost_attrs[i]);
 955                         if (error)
 956                                 return error;
 957                 }
 958         }
 959
 960         transport_register_device(&shost->shost_gendev);
 961         return 0;
 962 }
 963
 964 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
 965 {
 966         unsigned long flags;
 967         struct Scsi_Host *shost = sdev->host;
 968         struct scsi_target  *starget = sdev->sdev_target;
 969
 970         device_initialize(&sdev->sdev_gendev);
 971         sdev->sdev_gendev.bus = &scsi_bus_type;
 972         sdev->sdev_gendev.release = scsi_device_dev_release;
 973         sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d",
 974                 sdev->host->host_no, sdev->channel, sdev->id,
 975                 sdev->lun);
 976
 977         class_device_initialize(&sdev->sdev_classdev);
 978         sdev->sdev_classdev.dev = &sdev->sdev_gendev;
 979         sdev->sdev_classdev.class = &sdev_class;
 980         snprintf(sdev->sdev_classdev.class_id, BUS_ID_SIZE,
 981                  "%d:%d:%d:%d", sdev->host->host_no,
 982                  sdev->channel, sdev->id, sdev->lun);
 983         sdev->scsi_level = starget->scsi_level;
 984         transport_setup_device(&sdev->sdev_gendev);
 985         spin_lock_irqsave(shost->host_lock, flags);
 986         list_add_tail(&sdev->same_target_siblings, &starget->devices);
 987         list_add_tail(&sdev->siblings, &shost->__devices);
 988         spin_unlock_irqrestore(shost->host_lock, flags);
 989 }
 990
 991 int scsi_is_sdev_device(const struct device *dev)
 992 {
 993         return dev->release == scsi_device_dev_release;
 994 }
 995 EXPORT_SYMBOL(scsi_is_sdev_device);
 996
 997 /* A blank transport template that is used in drivers that don't
 998  * yet implement Transport Attributes */
 999 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };