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/config.h>
  10 #include <linux/module.h>
  11 #include <linux/init.h>
  12 #include <linux/blkdev.h>
  13 #include <linux/device.h>
  14
  15 #include <scsi/scsi.h>
  16 #include <scsi/scsi_device.h>
  17 #include <scsi/scsi_host.h>
  18 #include <scsi/scsi_tcq.h>
  19 #include <scsi/scsi_transport.h>
  20
  21 #include "scsi_priv.h"
  22 #include "scsi_logging.h"
  23
  24 static struct {
  25         enum scsi_device_state  value;
  26         char                    *name;
  27 } sdev_states[] = {
  28         { SDEV_CREATED, "created" },
  29         { SDEV_RUNNING, "running" },
  30         { SDEV_CANCEL, "cancel" },
  31         { SDEV_DEL, "deleted" },
  32         { SDEV_QUIESCE, "quiesce" },
  33         { SDEV_OFFLINE, "offline" },
  34         { SDEV_BLOCK,   "blocked" },
  35 };
  36
  37 const char *scsi_device_state_name(enum scsi_device_state state)
  38 {
  39         int i;
  40         char *name = NULL;
  41
  42         for (i = 0; i < sizeof(sdev_states)/sizeof(sdev_states[0]); i++) {
  43                 if (sdev_states[i].value == state) {
  44                         name = sdev_states[i].name;
  45                         break;
  46                 }
  47         }
  48         return name;
  49 }
  50
  51 static int check_set(unsigned int *val, char *src)
  52 {
  53         char *last;
  54
  55         if (strncmp(src, "-", 20) == 0) {
  56                 *val = SCAN_WILD_CARD;
  57         } else {
  58                 /*
  59                  * Doesn't check for int overflow
  60                  */
  61                 *val = simple_strtoul(src, &last, 0);
  62                 if (*last != '\0')
  63                         return 1;
  64         }
  65         return 0;
  66 }
  67
  68 static int scsi_scan(struct Scsi_Host *shost, const char *str)
  69 {
  70         char s1[15], s2[15], s3[15], junk;
  71         unsigned int channel, id, lun;
  72         int res;
  73
  74         res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk);
  75         if (res != 3)
  76                 return -EINVAL;
  77         if (check_set(&channel, s1))
  78                 return -EINVAL;
  79         if (check_set(&id, s2))
  80                 return -EINVAL;
  81         if (check_set(&lun, s3))
  82                 return -EINVAL;
  83         res = scsi_scan_host_selected(shost, channel, id, lun, 1);
  84         return res;
  85 }
  86
  87 /*
  88  * shost_show_function: macro to create an attr function that can be used to
  89  * show a non-bit field.
  90  */
  91 #define shost_show_function(name, field, format_string)                 \
  92 static ssize_t                                                          \
  93 show_##name (struct class_device *class_dev, char *buf)                 \
  94 {                                                                       \
  95         struct Scsi_Host *shost = class_to_shost(class_dev);            \
  96         return snprintf (buf, 20, format_string, shost->field);         \
  97 }
  98
  99 /*
 100  * shost_rd_attr: macro to create a function and attribute variable for a
 101  * read only field.
 102  */
 103 #define shost_rd_attr2(name, field, format_string)                      \
 104         shost_show_function(name, field, format_string)                 \
 105 static CLASS_DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
 106
 107 #define shost_rd_attr(field, format_string) \
 108 shost_rd_attr2(field, field, format_string)
 109
 110 /*
 111  * Create the actual show/store functions and data structures.
 112  */
 113
 114 static ssize_t store_scan(struct class_device *class_dev, const char *buf,
 115                           size_t count)
 116 {
 117         struct Scsi_Host *shost = class_to_shost(class_dev);
 118         int res;
 119
 120         res = scsi_scan(shost, buf);
 121         if (res == 0)
 122                 res = count;
 123         return res;
 124 };
 125 static CLASS_DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
 126
 127 shost_rd_attr(unique_id, "%u\n");
 128 shost_rd_attr(host_busy, "%hu\n");
 129 shost_rd_attr(cmd_per_lun, "%hd\n");
 130 shost_rd_attr(sg_tablesize, "%hu\n");
 131 shost_rd_attr(unchecked_isa_dma, "%d\n");
 132 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
 133
 134 static struct class_device_attribute *scsi_sysfs_shost_attrs[] = {
 135         &class_device_attr_unique_id,
 136         &class_device_attr_host_busy,
 137         &class_device_attr_cmd_per_lun,
 138         &class_device_attr_sg_tablesize,
 139         &class_device_attr_unchecked_isa_dma,
 140         &class_device_attr_proc_name,
 141         &class_device_attr_scan,
 142         NULL
 143 };
 144
 145 static void scsi_device_cls_release(struct class_device *class_dev)
 146 {
 147         struct scsi_device *sdev;
 148
 149         sdev = class_to_sdev(class_dev);
 150         put_device(&sdev->sdev_gendev);
 151 }
 152
 153 void scsi_device_dev_release(struct device *dev)
 154 {
 155         struct scsi_device *sdev;
 156         struct device *parent;
 157         struct scsi_target *starget;
 158         unsigned long flags;
 159
 160         parent = dev->parent;
 161         sdev = to_scsi_device(dev);
 162         starget = to_scsi_target(parent);
 163
 164         spin_lock_irqsave(sdev->host->host_lock, flags);
 165         starget->reap_ref++;
 166         list_del(&sdev->siblings);
 167         list_del(&sdev->same_target_siblings);
 168         list_del(&sdev->starved_entry);
 169         spin_unlock_irqrestore(sdev->host->host_lock, flags);
 170
 171         if (sdev->request_queue) {
 172                 sdev->request_queue->queuedata = NULL;
 173                 scsi_free_queue(sdev->request_queue);
 174         }
 175
 176         scsi_target_reap(scsi_target(sdev));
 177
 178         kfree(sdev->inquiry);
 179         kfree(sdev);
 180
 181         if (parent)
 182                 put_device(parent);
 183 }
 184
 185 struct class sdev_class = {
 186         .name           = "scsi_device",
 187         .release        = scsi_device_cls_release,
 188 };
 189
 190 /* all probing is done in the individual ->probe routines */
 191 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 192 {
 193         struct scsi_device *sdp = to_scsi_device(dev);
 194         if (sdp->no_uld_attach)
 195                 return 0;
 196         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 197 }
 198
 199 struct bus_type scsi_bus_type = {
 200         .name           = "scsi",
 201         .match          = scsi_bus_match,
 202 };
 203
 204 int scsi_sysfs_register(void)
 205 {
 206         int error;
 207
 208         error = bus_register(&scsi_bus_type);
 209         if (!error) {
 210                 error = class_register(&sdev_class);
 211                 if (error)
 212                         bus_unregister(&scsi_bus_type);
 213         }
 214
 215         return error;
 216 }
 217
 218 void scsi_sysfs_unregister(void)
 219 {
 220         class_unregister(&sdev_class);
 221         bus_unregister(&scsi_bus_type);
 222 }
 223
 224 /*
 225  * sdev_show_function: macro to create an attr function that can be used to
 226  * show a non-bit field.
 227  */
 228 #define sdev_show_function(field, format_string)                                \
 229 static ssize_t                                                          \
 230 sdev_show_##field (struct device *dev, char *buf)                               \
 231 {                                                                       \
 232         struct scsi_device *sdev;                                       \
 233         sdev = to_scsi_device(dev);                                     \
 234         return snprintf (buf, 20, format_string, sdev->field);          \
 235 }                                                                       \
 236
 237 /*
 238  * sdev_rd_attr: macro to create a function and attribute variable for a
 239  * read only field.
 240  */
 241 #define sdev_rd_attr(field, format_string)                              \
 242         sdev_show_function(field, format_string)                        \
 243 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 244
 245
 246 /*
 247  * sdev_rd_attr: create a function and attribute variable for a
 248  * read/write field.
 249  */
 250 #define sdev_rw_attr(field, format_string)                              \
 251         sdev_show_function(field, format_string)                                \
 252                                                                         \
 253 static ssize_t                                                          \
 254 sdev_store_##field (struct device *dev, const char *buf, size_t count)  \
 255 {                                                                       \
 256         struct scsi_device *sdev;                                       \
 257         sdev = to_scsi_device(dev);                                     \
 258         snscanf (buf, 20, format_string, &sdev->field);                 \
 259         return count;                                                   \
 260 }                                                                       \
 261 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 262
 263 /* Currently we don't export bit fields, but we might in future,
 264  * so leave this code in */
 265 #if 0
 266 /*
 267  * sdev_rd_attr: create a function and attribute variable for a
 268  * read/write bit field.
 269  */
 270 #define sdev_rw_attr_bit(field)                                         \
 271         sdev_show_function(field, "%d\n")                                       \
 272                                                                         \
 273 static ssize_t                                                          \
 274 sdev_store_##field (struct device *dev, const char *buf, size_t count)  \
 275 {                                                                       \
 276         int ret;                                                        \
 277         struct scsi_device *sdev;                                       \
 278         ret = scsi_sdev_check_buf_bit(buf);                             \
 279         if (ret >= 0)   {                                               \
 280                 sdev = to_scsi_device(dev);                             \
 281                 sdev->field = ret;                                      \
 282                 ret = count;                                            \
 283         }                                                               \
 284         return ret;                                                     \
 285 }                                                                       \
 286 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 287
 288 /*
 289  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 290  * else return -EINVAL.
 291  */
 292 static int scsi_sdev_check_buf_bit(const char *buf)
 293 {
 294         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 295                 if (buf[0] == '1')
 296                         return 1;
 297                 else if (buf[0] == '0')
 298                         return 0;
 299                 else
 300                         return -EINVAL;
 301         } else
 302                 return -EINVAL;
 303 }
 304 #endif
 305 /*
 306  * Create the actual show/store functions and data structures.
 307  */
 308 sdev_rd_attr (device_blocked, "%d\n");
 309 sdev_rd_attr (queue_depth, "%d\n");
 310 sdev_rd_attr (type, "%d\n");
 311 sdev_rd_attr (scsi_level, "%d\n");
 312 sdev_rd_attr (vendor, "%.8s\n");
 313 sdev_rd_attr (model, "%.16s\n");
 314 sdev_rd_attr (rev, "%.4s\n");
 315
 316 static ssize_t
 317 sdev_show_timeout (struct device *dev, char *buf)
 318 {
 319         struct scsi_device *sdev;
 320         sdev = to_scsi_device(dev);
 321         return snprintf (buf, 20, "%d\n", sdev->timeout / HZ);
 322 }
 323
 324 static ssize_t
 325 sdev_store_timeout (struct device *dev, const char *buf, size_t count)
 326 {
 327         struct scsi_device *sdev;
 328         int timeout;
 329         sdev = to_scsi_device(dev);
 330         sscanf (buf, "%d\n", &timeout);
 331         sdev->timeout = timeout * HZ;
 332         return count;
 333 }
 334 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 335
 336 static ssize_t
 337 store_rescan_field (struct device *dev, const char *buf, size_t count)
 338 {
 339         scsi_rescan_device(dev);
 340         return count;
 341 }
 342 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 343
 344 static ssize_t sdev_store_delete(struct device *dev, const char *buf,
 345                                  size_t count)
 346 {
 347         scsi_remove_device(to_scsi_device(dev));
 348         return count;
 349 };
 350 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 351
 352 static ssize_t
 353 store_state_field(struct device *dev, const char *buf, size_t count)
 354 {
 355         int i;
 356         struct scsi_device *sdev = to_scsi_device(dev);
 357         enum scsi_device_state state = 0;
 358
 359         for (i = 0; i < sizeof(sdev_states)/sizeof(sdev_states[0]); i++) {
 360                 const int len = strlen(sdev_states[i].name);
 361                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 362                    buf[len] == '\n') {
 363                         state = sdev_states[i].value;
 364                         break;
 365                 }
 366         }
 367         if (!state)
 368                 return -EINVAL;
 369
 370         if (scsi_device_set_state(sdev, state))
 371                 return -EINVAL;
 372         return count;
 373 }
 374
 375 static ssize_t
 376 show_state_field(struct device *dev, char *buf)
 377 {
 378         struct scsi_device *sdev = to_scsi_device(dev);
 379         const char *name = scsi_device_state_name(sdev->sdev_state);
 380
 381         if (!name)
 382                 return -EINVAL;
 383
 384         return snprintf(buf, 20, "%s\n", name);
 385 }
 386
 387 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 388
 389 static ssize_t
 390 show_queue_type_field(struct device *dev, char *buf)
 391 {
 392         struct scsi_device *sdev = to_scsi_device(dev);
 393         const char *name = "none";
 394
 395         if (sdev->ordered_tags)
 396                 name = "ordered";
 397         else if (sdev->simple_tags)
 398                 name = "simple";
 399
 400         return snprintf(buf, 20, "%s\n", name);
 401 }
 402
 403 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
 404
 405 static ssize_t
 406 show_iostat_counterbits(struct device *dev, char *buf)
 407 {
 408         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 409 }
 410
 411 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 412
 413 #define show_sdev_iostat(field)                                         \
 414 static ssize_t                                                          \
 415 show_iostat_##field(struct device *dev, char *buf)                      \
 416 {                                                                       \
 417         struct scsi_device *sdev = to_scsi_device(dev);                 \
 418         unsigned long long count = atomic_read(&sdev->field);           \
 419         return snprintf(buf, 20, "0x%llx\n", count);                    \
 420 }                                                                       \
 421 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 422
 423 show_sdev_iostat(iorequest_cnt);
 424 show_sdev_iostat(iodone_cnt);
 425 show_sdev_iostat(ioerr_cnt);
 426
 427
 428 /* Default template for device attributes.  May NOT be modified */
 429 static struct device_attribute *scsi_sysfs_sdev_attrs[] = {
 430         &dev_attr_device_blocked,
 431         &dev_attr_queue_depth,
 432         &dev_attr_queue_type,
 433         &dev_attr_type,
 434         &dev_attr_scsi_level,
 435         &dev_attr_vendor,
 436         &dev_attr_model,
 437         &dev_attr_rev,
 438         &dev_attr_rescan,
 439         &dev_attr_delete,
 440         &dev_attr_state,
 441         &dev_attr_timeout,
 442         &dev_attr_iocounterbits,
 443         &dev_attr_iorequest_cnt,
 444         &dev_attr_iodone_cnt,
 445         &dev_attr_ioerr_cnt,
 446         NULL
 447 };
 448
 449 static ssize_t sdev_store_queue_depth_rw(struct device *dev, const char *buf,
 450                                          size_t count)
 451 {
 452         int depth, retval;
 453         struct scsi_device *sdev = to_scsi_device(dev);
 454         struct scsi_host_template *sht = sdev->host->hostt;
 455
 456         if (!sht->change_queue_depth)
 457                 return -EINVAL;
 458
 459         depth = simple_strtoul(buf, NULL, 0);
 460
 461         if (depth < 1)
 462                 return -EINVAL;
 463
 464         retval = sht->change_queue_depth(sdev, depth);
 465         if (retval < 0)
 466                 return retval;
 467
 468         return count;
 469 }
 470
 471 static struct device_attribute sdev_attr_queue_depth_rw =
 472         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 473                sdev_store_queue_depth_rw);
 474
 475 static ssize_t sdev_store_queue_type_rw(struct device *dev, const char *buf,
 476                                         size_t count)
 477 {
 478         struct scsi_device *sdev = to_scsi_device(dev);
 479         struct scsi_host_template *sht = sdev->host->hostt;
 480         int tag_type = 0, retval;
 481         int prev_tag_type = scsi_get_tag_type(sdev);
 482
 483         if (!sdev->tagged_supported || !sht->change_queue_type)
 484                 return -EINVAL;
 485
 486         if (strncmp(buf, "ordered", 7) == 0)
 487                 tag_type = MSG_ORDERED_TAG;
 488         else if (strncmp(buf, "simple", 6) == 0)
 489                 tag_type = MSG_SIMPLE_TAG;
 490         else if (strncmp(buf, "none", 4) != 0)
 491                 return -EINVAL;
 492
 493         if (tag_type == prev_tag_type)
 494                 return count;
 495
 496         retval = sht->change_queue_type(sdev, tag_type);
 497         if (retval < 0)
 498                 return retval;
 499
 500         return count;
 501 }
 502
 503 static struct device_attribute sdev_attr_queue_type_rw =
 504         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 505                sdev_store_queue_type_rw);
 506
 507 static struct device_attribute *attr_changed_internally(
 508                 struct Scsi_Host *shost,
 509                 struct device_attribute * attr)
 510 {
 511         if (!strcmp("queue_depth", attr->attr.name)
 512             && shost->hostt->change_queue_depth)
 513                 return &sdev_attr_queue_depth_rw;
 514         else if (!strcmp("queue_type", attr->attr.name)
 515             && shost->hostt->change_queue_type)
 516                 return &sdev_attr_queue_type_rw;
 517         return attr;
 518 }
 519
 520
 521 static struct device_attribute *attr_overridden(
 522                 struct device_attribute **attrs,
 523                 struct device_attribute *attr)
 524 {
 525         int i;
 526
 527         if (!attrs)
 528                 return NULL;
 529         for (i = 0; attrs[i]; i++)
 530                 if (!strcmp(attrs[i]->attr.name, attr->attr.name))
 531                         return attrs[i];
 532         return NULL;
 533 }
 534
 535 static int attr_add(struct device *dev, struct device_attribute *attr)
 536 {
 537         struct device_attribute *base_attr;
 538
 539         /*
 540          * Spare the caller from having to copy things it's not interested in.
 541          */
 542         base_attr = attr_overridden(scsi_sysfs_sdev_attrs, attr);
 543         if (base_attr) {
 544                 /* extend permissions */
 545                 attr->attr.mode |= base_attr->attr.mode;
 546
 547                 /* override null show/store with default */
 548                 if (!attr->show)
 549                         attr->show = base_attr->show;
 550                 if (!attr->store)
 551                         attr->store = base_attr->store;
 552         }
 553
 554         return device_create_file(dev, attr);
 555 }
 556
 557 /**
 558  * scsi_sysfs_add_sdev - add scsi device to sysfs
 559  * @sdev:       scsi_device to add
 560  *
 561  * Return value:
 562  *      0 on Success / non-zero on Failure
 563  **/
 564 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 565 {
 566         int error, i;
 567
 568         if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0)
 569                 return error;
 570
 571         error = device_add(&sdev->sdev_gendev);
 572         if (error) {
 573                 put_device(sdev->sdev_gendev.parent);
 574                 printk(KERN_INFO "error 1\n");
 575                 return error;
 576         }
 577         error = class_device_add(&sdev->sdev_classdev);
 578         if (error) {
 579                 printk(KERN_INFO "error 2\n");
 580                 goto clean_device;
 581         }
 582
 583         /* take a reference for the sdev_classdev; this is
 584          * released by the sdev_class .release */
 585         get_device(&sdev->sdev_gendev);
 586         if (sdev->host->hostt->sdev_attrs) {
 587                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
 588                         error = attr_add(&sdev->sdev_gendev,
 589                                         sdev->host->hostt->sdev_attrs[i]);
 590                         if (error) {
 591                                 scsi_remove_device(sdev);
 592                                 goto out;
 593                         }
 594                 }
 595         }
 596
 597         for (i = 0; scsi_sysfs_sdev_attrs[i]; i++) {
 598                 if (!attr_overridden(sdev->host->hostt->sdev_attrs,
 599                                         scsi_sysfs_sdev_attrs[i])) {
 600                         struct device_attribute * attr =
 601                                 attr_changed_internally(sdev->host,
 602                                                         scsi_sysfs_sdev_attrs[i]);
 603                         error = device_create_file(&sdev->sdev_gendev, attr);
 604                         if (error) {
 605                                 scsi_remove_device(sdev);
 606                                 goto out;
 607                         }
 608                 }
 609         }
 610
 611         transport_add_device(&sdev->sdev_gendev);
 612  out:
 613         return error;
 614
 615  clean_device:
 616         scsi_device_set_state(sdev, SDEV_CANCEL);
 617
 618         device_del(&sdev->sdev_gendev);
 619         transport_destroy_device(&sdev->sdev_gendev);
 620         put_device(&sdev->sdev_gendev);
 621
 622         return error;
 623 }
 624
 625 /**
 626  * scsi_remove_device - unregister a device from the scsi bus
 627  * @sdev:       scsi_device to unregister
 628  **/
 629 void scsi_remove_device(struct scsi_device *sdev)
 630 {
 631         struct Scsi_Host *shost = sdev->host;
 632
 633         down(&shost->scan_mutex);
 634         if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
 635                 goto out;
 636
 637         class_device_unregister(&sdev->sdev_classdev);
 638         device_del(&sdev->sdev_gendev);
 639         scsi_device_set_state(sdev, SDEV_DEL);
 640         if (sdev->host->hostt->slave_destroy)
 641                 sdev->host->hostt->slave_destroy(sdev);
 642         transport_unregister_device(&sdev->sdev_gendev);
 643         put_device(&sdev->sdev_gendev);
 644 out:
 645         up(&shost->scan_mutex);
 646 }
 647 EXPORT_SYMBOL(scsi_remove_device);
 648
 649 void __scsi_remove_target(struct scsi_target *starget)
 650 {
 651         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 652         unsigned long flags;
 653         struct scsi_device *sdev, *tmp;
 654
 655         spin_lock_irqsave(shost->host_lock, flags);
 656         starget->reap_ref++;
 657         list_for_each_entry_safe(sdev, tmp, &shost->__devices, siblings) {
 658                 if (sdev->channel != starget->channel ||
 659                     sdev->id != starget->id)
 660                         continue;
 661                 spin_unlock_irqrestore(shost->host_lock, flags);
 662                 scsi_remove_device(sdev);
 663                 spin_lock_irqsave(shost->host_lock, flags);
 664         }
 665         spin_unlock_irqrestore(shost->host_lock, flags);
 666         scsi_target_reap(starget);
 667 }
 668
 669 /**
 670  * scsi_remove_target - try to remove a target and all its devices
 671  * @dev: generic starget or parent of generic stargets to be removed
 672  *
 673  * Note: This is slightly racy.  It is possible that if the user
 674  * requests the addition of another device then the target won't be
 675  * removed.
 676  */
 677 void scsi_remove_target(struct device *dev)
 678 {
 679         struct device *rdev, *idev, *next;
 680
 681         if (scsi_is_target_device(dev)) {
 682                 __scsi_remove_target(to_scsi_target(dev));
 683                 return;
 684         }
 685
 686         rdev = get_device(dev);
 687         list_for_each_entry_safe(idev, next, &dev->children, node) {
 688                 if (scsi_is_target_device(idev))
 689                         __scsi_remove_target(to_scsi_target(idev));
 690         }
 691         put_device(rdev);
 692 }
 693 EXPORT_SYMBOL(scsi_remove_target);
 694
 695 int scsi_register_driver(struct device_driver *drv)
 696 {
 697         drv->bus = &scsi_bus_type;
 698
 699         return driver_register(drv);
 700 }
 701 EXPORT_SYMBOL(scsi_register_driver);
 702
 703 int scsi_register_interface(struct class_interface *intf)
 704 {
 705         intf->class = &sdev_class;
 706
 707         return class_interface_register(intf);
 708 }
 709 EXPORT_SYMBOL(scsi_register_interface);
 710
 711
 712 static struct class_device_attribute *class_attr_overridden(
 713                 struct class_device_attribute **attrs,
 714                 struct class_device_attribute *attr)
 715 {
 716         int i;
 717
 718         if (!attrs)
 719                 return NULL;
 720         for (i = 0; attrs[i]; i++)
 721                 if (!strcmp(attrs[i]->attr.name, attr->attr.name))
 722                         return attrs[i];
 723         return NULL;
 724 }
 725
 726 static int class_attr_add(struct class_device *classdev,
 727                 struct class_device_attribute *attr)
 728 {
 729         struct class_device_attribute *base_attr;
 730
 731         /*
 732          * Spare the caller from having to copy things it's not interested in.
 733          */
 734         base_attr = class_attr_overridden(scsi_sysfs_shost_attrs, attr);
 735         if (base_attr) {
 736                 /* extend permissions */
 737                 attr->attr.mode |= base_attr->attr.mode;
 738
 739                 /* override null show/store with default */
 740                 if (!attr->show)
 741                         attr->show = base_attr->show;
 742                 if (!attr->store)
 743                         attr->store = base_attr->store;
 744         }
 745
 746         return class_device_create_file(classdev, attr);
 747 }
 748
 749 /**
 750  * scsi_sysfs_add_host - add scsi host to subsystem
 751  * @shost:     scsi host struct to add to subsystem
 752  * @dev:       parent struct device pointer
 753  **/
 754 int scsi_sysfs_add_host(struct Scsi_Host *shost)
 755 {
 756         int error, i;
 757
 758         if (shost->hostt->shost_attrs) {
 759                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
 760                         error = class_attr_add(&shost->shost_classdev,
 761                                         shost->hostt->shost_attrs[i]);
 762                         if (error)
 763                                 return error;
 764                 }
 765         }
 766
 767         for (i = 0; scsi_sysfs_shost_attrs[i]; i++) {
 768                 if (!class_attr_overridden(shost->hostt->shost_attrs,
 769                                         scsi_sysfs_shost_attrs[i])) {
 770                         error = class_device_create_file(&shost->shost_classdev,
 771                                         scsi_sysfs_shost_attrs[i]);
 772                         if (error)
 773                                 return error;
 774                 }
 775         }
 776
 777         transport_register_device(&shost->shost_gendev);
 778         return 0;
 779 }
 780
 781 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
 782 {
 783         unsigned long flags;
 784         struct Scsi_Host *shost = sdev->host;
 785         struct scsi_target  *starget = sdev->sdev_target;
 786
 787         device_initialize(&sdev->sdev_gendev);
 788         sdev->sdev_gendev.bus = &scsi_bus_type;
 789         sdev->sdev_gendev.release = scsi_device_dev_release;
 790         sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d",
 791                 sdev->host->host_no, sdev->channel, sdev->id,
 792                 sdev->lun);
 793
 794         class_device_initialize(&sdev->sdev_classdev);
 795         sdev->sdev_classdev.dev = &sdev->sdev_gendev;
 796         sdev->sdev_classdev.class = &sdev_class;
 797         snprintf(sdev->sdev_classdev.class_id, BUS_ID_SIZE,
 798                  "%d:%d:%d:%d", sdev->host->host_no,
 799                  sdev->channel, sdev->id, sdev->lun);
 800         sdev->scsi_level = SCSI_2;
 801         transport_setup_device(&sdev->sdev_gendev);
 802         spin_lock_irqsave(shost->host_lock, flags);
 803         list_add_tail(&sdev->same_target_siblings, &starget->devices);
 804         list_add_tail(&sdev->siblings, &shost->__devices);
 805         spin_unlock_irqrestore(shost->host_lock, flags);
 806 }
 807
 808 int scsi_is_sdev_device(const struct device *dev)
 809 {
 810         return dev->release == scsi_device_dev_release;
 811 }
 812 EXPORT_SYMBOL(scsi_is_sdev_device);
 813
 814 /* A blank transport template that is used in drivers that don't
 815  * yet implement Transport Attributes */
 816 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };