linux/drivers/scsi/scsi_sysfs.c
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   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/slab.h>
  11#include <linux/init.h>
  12#include <linux/blkdev.h>
  13#include <linux/device.h>
  14#include <linux/pm_runtime.h>
  15
  16#include <scsi/scsi.h>
  17#include <scsi/scsi_device.h>
  18#include <scsi/scsi_host.h>
  19#include <scsi/scsi_tcq.h>
  20#include <scsi/scsi_transport.h>
  21#include <scsi/scsi_driver.h>
  22
  23#include "scsi_priv.h"
  24#include "scsi_logging.h"
  25
  26static struct device_type scsi_dev_type;
  27
  28static const struct {
  29        enum scsi_device_state  value;
  30        char                    *name;
  31} sdev_states[] = {
  32        { SDEV_CREATED, "created" },
  33        { SDEV_RUNNING, "running" },
  34        { SDEV_CANCEL, "cancel" },
  35        { SDEV_DEL, "deleted" },
  36        { SDEV_QUIESCE, "quiesce" },
  37        { SDEV_OFFLINE, "offline" },
  38        { SDEV_TRANSPORT_OFFLINE, "transport-offline" },
  39        { SDEV_BLOCK,   "blocked" },
  40        { SDEV_CREATED_BLOCK, "created-blocked" },
  41};
  42
  43const char *scsi_device_state_name(enum scsi_device_state state)
  44{
  45        int i;
  46        char *name = NULL;
  47
  48        for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
  49                if (sdev_states[i].value == state) {
  50                        name = sdev_states[i].name;
  51                        break;
  52                }
  53        }
  54        return name;
  55}
  56
  57static const struct {
  58        enum scsi_host_state    value;
  59        char                    *name;
  60} shost_states[] = {
  61        { SHOST_CREATED, "created" },
  62        { SHOST_RUNNING, "running" },
  63        { SHOST_CANCEL, "cancel" },
  64        { SHOST_DEL, "deleted" },
  65        { SHOST_RECOVERY, "recovery" },
  66        { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
  67        { SHOST_DEL_RECOVERY, "deleted/recovery", },
  68};
  69const char *scsi_host_state_name(enum scsi_host_state state)
  70{
  71        int i;
  72        char *name = NULL;
  73
  74        for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
  75                if (shost_states[i].value == state) {
  76                        name = shost_states[i].name;
  77                        break;
  78                }
  79        }
  80        return name;
  81}
  82
  83static int check_set(unsigned int *val, char *src)
  84{
  85        char *last;
  86
  87        if (strncmp(src, "-", 20) == 0) {
  88                *val = SCAN_WILD_CARD;
  89        } else {
  90                /*
  91                 * Doesn't check for int overflow
  92                 */
  93                *val = simple_strtoul(src, &last, 0);
  94                if (*last != '\0')
  95                        return 1;
  96        }
  97        return 0;
  98}
  99
 100static int scsi_scan(struct Scsi_Host *shost, const char *str)
 101{
 102        char s1[15], s2[15], s3[15], junk;
 103        unsigned int channel, id, lun;
 104        int res;
 105
 106        res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk);
 107        if (res != 3)
 108                return -EINVAL;
 109        if (check_set(&channel, s1))
 110                return -EINVAL;
 111        if (check_set(&id, s2))
 112                return -EINVAL;
 113        if (check_set(&lun, s3))
 114                return -EINVAL;
 115        if (shost->transportt->user_scan)
 116                res = shost->transportt->user_scan(shost, channel, id, lun);
 117        else
 118                res = scsi_scan_host_selected(shost, channel, id, lun, 1);
 119        return res;
 120}
 121
 122/*
 123 * shost_show_function: macro to create an attr function that can be used to
 124 * show a non-bit field.
 125 */
 126#define shost_show_function(name, field, format_string)                 \
 127static ssize_t                                                          \
 128show_##name (struct device *dev, struct device_attribute *attr,         \
 129             char *buf)                                                 \
 130{                                                                       \
 131        struct Scsi_Host *shost = class_to_shost(dev);                  \
 132        return snprintf (buf, 20, format_string, shost->field);         \
 133}
 134
 135/*
 136 * shost_rd_attr: macro to create a function and attribute variable for a
 137 * read only field.
 138 */
 139#define shost_rd_attr2(name, field, format_string)                      \
 140        shost_show_function(name, field, format_string)                 \
 141static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
 142
 143#define shost_rd_attr(field, format_string) \
 144shost_rd_attr2(field, field, format_string)
 145
 146/*
 147 * Create the actual show/store functions and data structures.
 148 */
 149
 150static ssize_t
 151store_scan(struct device *dev, struct device_attribute *attr,
 152           const char *buf, size_t count)
 153{
 154        struct Scsi_Host *shost = class_to_shost(dev);
 155        int res;
 156
 157        res = scsi_scan(shost, buf);
 158        if (res == 0)
 159                res = count;
 160        return res;
 161};
 162static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
 163
 164static ssize_t
 165store_shost_state(struct device *dev, struct device_attribute *attr,
 166                  const char *buf, size_t count)
 167{
 168        int i;
 169        struct Scsi_Host *shost = class_to_shost(dev);
 170        enum scsi_host_state state = 0;
 171
 172        for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
 173                const int len = strlen(shost_states[i].name);
 174                if (strncmp(shost_states[i].name, buf, len) == 0 &&
 175                   buf[len] == '\n') {
 176                        state = shost_states[i].value;
 177                        break;
 178                }
 179        }
 180        if (!state)
 181                return -EINVAL;
 182
 183        if (scsi_host_set_state(shost, state))
 184                return -EINVAL;
 185        return count;
 186}
 187
 188static ssize_t
 189show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
 190{
 191        struct Scsi_Host *shost = class_to_shost(dev);
 192        const char *name = scsi_host_state_name(shost->shost_state);
 193
 194        if (!name)
 195                return -EINVAL;
 196
 197        return snprintf(buf, 20, "%s\n", name);
 198}
 199
 200/* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
 201struct device_attribute dev_attr_hstate =
 202        __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
 203
 204static ssize_t
 205show_shost_mode(unsigned int mode, char *buf)
 206{
 207        ssize_t len = 0;
 208
 209        if (mode & MODE_INITIATOR)
 210                len = sprintf(buf, "%s", "Initiator");
 211
 212        if (mode & MODE_TARGET)
 213                len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
 214
 215        len += sprintf(buf + len, "\n");
 216
 217        return len;
 218}
 219
 220static ssize_t
 221show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
 222                          char *buf)
 223{
 224        struct Scsi_Host *shost = class_to_shost(dev);
 225        unsigned int supported_mode = shost->hostt->supported_mode;
 226
 227        if (supported_mode == MODE_UNKNOWN)
 228                /* by default this should be initiator */
 229                supported_mode = MODE_INITIATOR;
 230
 231        return show_shost_mode(supported_mode, buf);
 232}
 233
 234static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
 235
 236static ssize_t
 237show_shost_active_mode(struct device *dev,
 238                       struct device_attribute *attr, char *buf)
 239{
 240        struct Scsi_Host *shost = class_to_shost(dev);
 241
 242        if (shost->active_mode == MODE_UNKNOWN)
 243                return snprintf(buf, 20, "unknown\n");
 244        else
 245                return show_shost_mode(shost->active_mode, buf);
 246}
 247
 248static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
 249
 250static int check_reset_type(char *str)
 251{
 252        if (strncmp(str, "adapter", 10) == 0)
 253                return SCSI_ADAPTER_RESET;
 254        else if (strncmp(str, "firmware", 10) == 0)
 255                return SCSI_FIRMWARE_RESET;
 256        else
 257                return 0;
 258}
 259
 260static ssize_t
 261store_host_reset(struct device *dev, struct device_attribute *attr,
 262                const char *buf, size_t count)
 263{
 264        struct Scsi_Host *shost = class_to_shost(dev);
 265        struct scsi_host_template *sht = shost->hostt;
 266        int ret = -EINVAL;
 267        char str[10];
 268        int type;
 269
 270        sscanf(buf, "%s", str);
 271        type = check_reset_type(str);
 272
 273        if (!type)
 274                goto exit_store_host_reset;
 275
 276        if (sht->host_reset)
 277                ret = sht->host_reset(shost, type);
 278
 279exit_store_host_reset:
 280        if (ret == 0)
 281                ret = count;
 282        return ret;
 283}
 284
 285static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
 286
 287shost_rd_attr(unique_id, "%u\n");
 288shost_rd_attr(host_busy, "%hu\n");
 289shost_rd_attr(cmd_per_lun, "%hd\n");
 290shost_rd_attr(can_queue, "%hd\n");
 291shost_rd_attr(sg_tablesize, "%hu\n");
 292shost_rd_attr(sg_prot_tablesize, "%hu\n");
 293shost_rd_attr(unchecked_isa_dma, "%d\n");
 294shost_rd_attr(prot_capabilities, "%u\n");
 295shost_rd_attr(prot_guard_type, "%hd\n");
 296shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
 297
 298static struct attribute *scsi_sysfs_shost_attrs[] = {
 299        &dev_attr_unique_id.attr,
 300        &dev_attr_host_busy.attr,
 301        &dev_attr_cmd_per_lun.attr,
 302        &dev_attr_can_queue.attr,
 303        &dev_attr_sg_tablesize.attr,
 304        &dev_attr_sg_prot_tablesize.attr,
 305        &dev_attr_unchecked_isa_dma.attr,
 306        &dev_attr_proc_name.attr,
 307        &dev_attr_scan.attr,
 308        &dev_attr_hstate.attr,
 309        &dev_attr_supported_mode.attr,
 310        &dev_attr_active_mode.attr,
 311        &dev_attr_prot_capabilities.attr,
 312        &dev_attr_prot_guard_type.attr,
 313        &dev_attr_host_reset.attr,
 314        NULL
 315};
 316
 317struct attribute_group scsi_shost_attr_group = {
 318        .attrs =        scsi_sysfs_shost_attrs,
 319};
 320
 321const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
 322        &scsi_shost_attr_group,
 323        NULL
 324};
 325
 326static void scsi_device_cls_release(struct device *class_dev)
 327{
 328        struct scsi_device *sdev;
 329
 330        sdev = class_to_sdev(class_dev);
 331        put_device(&sdev->sdev_gendev);
 332}
 333
 334static void scsi_device_dev_release_usercontext(struct work_struct *work)
 335{
 336        struct scsi_device *sdev;
 337        struct device *parent;
 338        struct scsi_target *starget;
 339        struct list_head *this, *tmp;
 340        unsigned long flags;
 341
 342        sdev = container_of(work, struct scsi_device, ew.work);
 343
 344        parent = sdev->sdev_gendev.parent;
 345        starget = to_scsi_target(parent);
 346
 347        spin_lock_irqsave(sdev->host->host_lock, flags);
 348        starget->reap_ref++;
 349        list_del(&sdev->siblings);
 350        list_del(&sdev->same_target_siblings);
 351        list_del(&sdev->starved_entry);
 352        spin_unlock_irqrestore(sdev->host->host_lock, flags);
 353
 354        cancel_work_sync(&sdev->event_work);
 355
 356        list_for_each_safe(this, tmp, &sdev->event_list) {
 357                struct scsi_event *evt;
 358
 359                evt = list_entry(this, struct scsi_event, node);
 360                list_del(&evt->node);
 361                kfree(evt);
 362        }
 363
 364        blk_put_queue(sdev->request_queue);
 365        /* NULL queue means the device can't be used */
 366        sdev->request_queue = NULL;
 367
 368        scsi_target_reap(scsi_target(sdev));
 369
 370        kfree(sdev->inquiry);
 371        kfree(sdev);
 372
 373        if (parent)
 374                put_device(parent);
 375}
 376
 377static void scsi_device_dev_release(struct device *dev)
 378{
 379        struct scsi_device *sdp = to_scsi_device(dev);
 380        execute_in_process_context(scsi_device_dev_release_usercontext,
 381                                   &sdp->ew);
 382}
 383
 384static struct class sdev_class = {
 385        .name           = "scsi_device",
 386        .dev_release    = scsi_device_cls_release,
 387};
 388
 389/* all probing is done in the individual ->probe routines */
 390static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 391{
 392        struct scsi_device *sdp;
 393
 394        if (dev->type != &scsi_dev_type)
 395                return 0;
 396
 397        sdp = to_scsi_device(dev);
 398        if (sdp->no_uld_attach)
 399                return 0;
 400        return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 401}
 402
 403static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 404{
 405        struct scsi_device *sdev;
 406
 407        if (dev->type != &scsi_dev_type)
 408                return 0;
 409
 410        sdev = to_scsi_device(dev);
 411
 412        add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 413        return 0;
 414}
 415
 416struct bus_type scsi_bus_type = {
 417        .name           = "scsi",
 418        .match          = scsi_bus_match,
 419        .uevent         = scsi_bus_uevent,
 420#ifdef CONFIG_PM
 421        .pm             = &scsi_bus_pm_ops,
 422#endif
 423};
 424EXPORT_SYMBOL_GPL(scsi_bus_type);
 425
 426int scsi_sysfs_register(void)
 427{
 428        int error;
 429
 430        error = bus_register(&scsi_bus_type);
 431        if (!error) {
 432                error = class_register(&sdev_class);
 433                if (error)
 434                        bus_unregister(&scsi_bus_type);
 435        }
 436
 437        return error;
 438}
 439
 440void scsi_sysfs_unregister(void)
 441{
 442        class_unregister(&sdev_class);
 443        bus_unregister(&scsi_bus_type);
 444}
 445
 446/*
 447 * sdev_show_function: macro to create an attr function that can be used to
 448 * show a non-bit field.
 449 */
 450#define sdev_show_function(field, format_string)                                \
 451static ssize_t                                                          \
 452sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
 453                   char *buf)                                           \
 454{                                                                       \
 455        struct scsi_device *sdev;                                       \
 456        sdev = to_scsi_device(dev);                                     \
 457        return snprintf (buf, 20, format_string, sdev->field);          \
 458}                                                                       \
 459
 460/*
 461 * sdev_rd_attr: macro to create a function and attribute variable for a
 462 * read only field.
 463 */
 464#define sdev_rd_attr(field, format_string)                              \
 465        sdev_show_function(field, format_string)                        \
 466static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 467
 468
 469/*
 470 * sdev_rw_attr: create a function and attribute variable for a
 471 * read/write field.
 472 */
 473#define sdev_rw_attr(field, format_string)                              \
 474        sdev_show_function(field, format_string)                                \
 475                                                                        \
 476static ssize_t                                                          \
 477sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 478                    const char *buf, size_t count)                      \
 479{                                                                       \
 480        struct scsi_device *sdev;                                       \
 481        sdev = to_scsi_device(dev);                                     \
 482        sscanf (buf, format_string, &sdev->field);                      \
 483        return count;                                                   \
 484}                                                                       \
 485static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 486
 487/* Currently we don't export bit fields, but we might in future,
 488 * so leave this code in */
 489#if 0
 490/*
 491 * sdev_rd_attr: create a function and attribute variable for a
 492 * read/write bit field.
 493 */
 494#define sdev_rw_attr_bit(field)                                         \
 495        sdev_show_function(field, "%d\n")                                       \
 496                                                                        \
 497static ssize_t                                                          \
 498sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
 499                    const char *buf, size_t count)                      \
 500{                                                                       \
 501        int ret;                                                        \
 502        struct scsi_device *sdev;                                       \
 503        ret = scsi_sdev_check_buf_bit(buf);                             \
 504        if (ret >= 0)   {                                               \
 505                sdev = to_scsi_device(dev);                             \
 506                sdev->field = ret;                                      \
 507                ret = count;                                            \
 508        }                                                               \
 509        return ret;                                                     \
 510}                                                                       \
 511static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 512
 513/*
 514 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 515 * else return -EINVAL.
 516 */
 517static int scsi_sdev_check_buf_bit(const char *buf)
 518{
 519        if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 520                if (buf[0] == '1')
 521                        return 1;
 522                else if (buf[0] == '0')
 523                        return 0;
 524                else 
 525                        return -EINVAL;
 526        } else
 527                return -EINVAL;
 528}
 529#endif
 530/*
 531 * Create the actual show/store functions and data structures.
 532 */
 533sdev_rd_attr (device_blocked, "%d\n");
 534sdev_rd_attr (queue_depth, "%d\n");
 535sdev_rd_attr (type, "%d\n");
 536sdev_rd_attr (scsi_level, "%d\n");
 537sdev_rd_attr (vendor, "%.8s\n");
 538sdev_rd_attr (model, "%.16s\n");
 539sdev_rd_attr (rev, "%.4s\n");
 540
 541/*
 542 * TODO: can we make these symlinks to the block layer ones?
 543 */
 544static ssize_t
 545sdev_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->request_queue->rq_timeout / HZ);
 550}
 551
 552static ssize_t
 553sdev_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        blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
 561        return count;
 562}
 563static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 564
 565static ssize_t
 566store_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}
 572static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 573
 574static void sdev_store_delete_callback(struct device *dev)
 575{
 576        scsi_remove_device(to_scsi_device(dev));
 577}
 578
 579static ssize_t
 580sdev_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};
 593static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 594
 595static ssize_t
 596store_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
 619static ssize_t
 620show_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
 631static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 632
 633static ssize_t
 634show_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
 648static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
 649
 650static ssize_t
 651show_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
 656static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 657
 658#define show_sdev_iostat(field)                                         \
 659static ssize_t                                                          \
 660show_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}                                                                       \
 667static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 668
 669show_sdev_iostat(iorequest_cnt);
 670show_sdev_iostat(iodone_cnt);
 671show_sdev_iostat(ioerr_cnt);
 672
 673static ssize_t
 674sdev_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}
 680static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 681
 682#define DECLARE_EVT_SHOW(name, Cap_name)                                \
 683static ssize_t                                                          \
 684sdev_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)                               \
 693static ssize_t                                                          \
 694sdev_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
 715DECLARE_EVT(media_change, MEDIA_CHANGE)
 716
 717/* Default template for device attributes.  May NOT be modified */
 718static 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
 738static struct attribute_group scsi_sdev_attr_group = {
 739        .attrs =        scsi_sdev_attrs,
 740};
 741
 742static const struct attribute_group *scsi_sdev_attr_groups[] = {
 743        &scsi_sdev_attr_group,
 744        NULL
 745};
 746
 747static ssize_t
 748sdev_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                                         SCSI_QDEPTH_DEFAULT);
 765        if (retval < 0)
 766                return retval;
 767
 768        sdev->max_queue_depth = sdev->queue_depth;
 769
 770        return count;
 771}
 772
 773static struct device_attribute sdev_attr_queue_depth_rw =
 774        __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 775               sdev_store_queue_depth_rw);
 776
 777static ssize_t
 778sdev_show_queue_ramp_up_period(struct device *dev,
 779                               struct device_attribute *attr,
 780                               char *buf)
 781{
 782        struct scsi_device *sdev;
 783        sdev = to_scsi_device(dev);
 784        return snprintf(buf, 20, "%u\n",
 785                        jiffies_to_msecs(sdev->queue_ramp_up_period));
 786}
 787
 788static ssize_t
 789sdev_store_queue_ramp_up_period(struct device *dev,
 790                                struct device_attribute *attr,
 791                                const char *buf, size_t count)
 792{
 793        struct scsi_device *sdev = to_scsi_device(dev);
 794        unsigned long period;
 795
 796        if (strict_strtoul(buf, 10, &period))
 797                return -EINVAL;
 798
 799        sdev->queue_ramp_up_period = msecs_to_jiffies(period);
 800        return period;
 801}
 802
 803static struct device_attribute sdev_attr_queue_ramp_up_period =
 804        __ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
 805               sdev_show_queue_ramp_up_period,
 806               sdev_store_queue_ramp_up_period);
 807
 808static ssize_t
 809sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
 810                         const char *buf, size_t count)
 811{
 812        struct scsi_device *sdev = to_scsi_device(dev);
 813        struct scsi_host_template *sht = sdev->host->hostt;
 814        int tag_type = 0, retval;
 815        int prev_tag_type = scsi_get_tag_type(sdev);
 816
 817        if (!sdev->tagged_supported || !sht->change_queue_type)
 818                return -EINVAL;
 819
 820        if (strncmp(buf, "ordered", 7) == 0)
 821                tag_type = MSG_ORDERED_TAG;
 822        else if (strncmp(buf, "simple", 6) == 0)
 823                tag_type = MSG_SIMPLE_TAG;
 824        else if (strncmp(buf, "none", 4) != 0)
 825                return -EINVAL;
 826
 827        if (tag_type == prev_tag_type)
 828                return count;
 829
 830        retval = sht->change_queue_type(sdev, tag_type);
 831        if (retval < 0)
 832                return retval;
 833
 834        return count;
 835}
 836
 837static int scsi_target_add(struct scsi_target *starget)
 838{
 839        int error;
 840
 841        if (starget->state != STARGET_CREATED)
 842                return 0;
 843
 844        error = device_add(&starget->dev);
 845        if (error) {
 846                dev_err(&starget->dev, "target device_add failed, error %d\n", error);
 847                return error;
 848        }
 849        transport_add_device(&starget->dev);
 850        starget->state = STARGET_RUNNING;
 851
 852        pm_runtime_set_active(&starget->dev);
 853        pm_runtime_enable(&starget->dev);
 854        device_enable_async_suspend(&starget->dev);
 855
 856        return 0;
 857}
 858
 859static struct device_attribute sdev_attr_queue_type_rw =
 860        __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 861               sdev_store_queue_type_rw);
 862
 863/**
 864 * scsi_sysfs_add_sdev - add scsi device to sysfs
 865 * @sdev:       scsi_device to add
 866 *
 867 * Return value:
 868 *      0 on Success / non-zero on Failure
 869 **/
 870int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 871{
 872        int error, i;
 873        struct request_queue *rq = sdev->request_queue;
 874        struct scsi_target *starget = sdev->sdev_target;
 875
 876        error = scsi_device_set_state(sdev, SDEV_RUNNING);
 877        if (error)
 878                return error;
 879
 880        error = scsi_target_add(starget);
 881        if (error)
 882                return error;
 883
 884        transport_configure_device(&starget->dev);
 885
 886        device_enable_async_suspend(&sdev->sdev_gendev);
 887        scsi_autopm_get_target(starget);
 888        pm_runtime_set_active(&sdev->sdev_gendev);
 889        pm_runtime_forbid(&sdev->sdev_gendev);
 890        pm_runtime_enable(&sdev->sdev_gendev);
 891        scsi_autopm_put_target(starget);
 892
 893        /* The following call will keep sdev active indefinitely, until
 894         * its driver does a corresponding scsi_autopm_pm_device().  Only
 895         * drivers supporting autosuspend will do this.
 896         */
 897        scsi_autopm_get_device(sdev);
 898
 899        error = device_add(&sdev->sdev_gendev);
 900        if (error) {
 901                sdev_printk(KERN_INFO, sdev,
 902                                "failed to add device: %d\n", error);
 903                return error;
 904        }
 905        device_enable_async_suspend(&sdev->sdev_dev);
 906        error = device_add(&sdev->sdev_dev);
 907        if (error) {
 908                sdev_printk(KERN_INFO, sdev,
 909                                "failed to add class device: %d\n", error);
 910                device_del(&sdev->sdev_gendev);
 911                return error;
 912        }
 913        transport_add_device(&sdev->sdev_gendev);
 914        sdev->is_visible = 1;
 915
 916        /* create queue files, which may be writable, depending on the host */
 917        if (sdev->host->hostt->change_queue_depth) {
 918                error = device_create_file(&sdev->sdev_gendev,
 919                                           &sdev_attr_queue_depth_rw);
 920                error = device_create_file(&sdev->sdev_gendev,
 921                                           &sdev_attr_queue_ramp_up_period);
 922        }
 923        else
 924                error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
 925        if (error)
 926                return error;
 927
 928        if (sdev->host->hostt->change_queue_type)
 929                error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
 930        else
 931                error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
 932        if (error)
 933                return error;
 934
 935        error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
 936
 937        if (error)
 938                /* we're treating error on bsg register as non-fatal,
 939                 * so pretend nothing went wrong */
 940                sdev_printk(KERN_INFO, sdev,
 941                            "Failed to register bsg queue, errno=%d\n", error);
 942
 943        /* add additional host specific attributes */
 944        if (sdev->host->hostt->sdev_attrs) {
 945                for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
 946                        error = device_create_file(&sdev->sdev_gendev,
 947                                        sdev->host->hostt->sdev_attrs[i]);
 948                        if (error)
 949                                return error;
 950                }
 951        }
 952
 953        return error;
 954}
 955
 956void __scsi_remove_device(struct scsi_device *sdev)
 957{
 958        struct device *dev = &sdev->sdev_gendev;
 959
 960        if (sdev->is_visible) {
 961                if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
 962                        return;
 963
 964                bsg_unregister_queue(sdev->request_queue);
 965                device_unregister(&sdev->sdev_dev);
 966                transport_remove_device(dev);
 967                device_del(dev);
 968        } else
 969                put_device(&sdev->sdev_dev);
 970
 971        /*
 972         * Stop accepting new requests and wait until all queuecommand() and
 973         * scsi_run_queue() invocations have finished before tearing down the
 974         * device.
 975         */
 976        scsi_device_set_state(sdev, SDEV_DEL);
 977        blk_cleanup_queue(sdev->request_queue);
 978        cancel_work_sync(&sdev->requeue_work);
 979
 980        if (sdev->host->hostt->slave_destroy)
 981                sdev->host->hostt->slave_destroy(sdev);
 982        transport_destroy_device(dev);
 983
 984        put_device(dev);
 985}
 986
 987/**
 988 * scsi_remove_device - unregister a device from the scsi bus
 989 * @sdev:       scsi_device to unregister
 990 **/
 991void scsi_remove_device(struct scsi_device *sdev)
 992{
 993        struct Scsi_Host *shost = sdev->host;
 994
 995        mutex_lock(&shost->scan_mutex);
 996        __scsi_remove_device(sdev);
 997        mutex_unlock(&shost->scan_mutex);
 998}
 999EXPORT_SYMBOL(scsi_remove_device);
1000
1001static void __scsi_remove_target(struct scsi_target *starget)
1002{
1003        struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1004        unsigned long flags;
1005        struct scsi_device *sdev;
1006
1007        spin_lock_irqsave(shost->host_lock, flags);
1008 restart:
1009        list_for_each_entry(sdev, &shost->__devices, siblings) {
1010                if (sdev->channel != starget->channel ||
1011                    sdev->id != starget->id ||
1012                    scsi_device_get(sdev))
1013                        continue;
1014                spin_unlock_irqrestore(shost->host_lock, flags);
1015                scsi_remove_device(sdev);
1016                scsi_device_put(sdev);
1017                spin_lock_irqsave(shost->host_lock, flags);
1018                goto restart;
1019        }
1020        spin_unlock_irqrestore(shost->host_lock, flags);
1021}
1022
1023/**
1024 * scsi_remove_target - try to remove a target and all its devices
1025 * @dev: generic starget or parent of generic stargets to be removed
1026 *
1027 * Note: This is slightly racy.  It is possible that if the user
1028 * requests the addition of another device then the target won't be
1029 * removed.
1030 */
1031void scsi_remove_target(struct device *dev)
1032{
1033        struct Scsi_Host *shost = dev_to_shost(dev->parent);
1034        struct scsi_target *starget, *last = NULL;
1035        unsigned long flags;
1036
1037        /* remove targets being careful to lookup next entry before
1038         * deleting the last
1039         */
1040        spin_lock_irqsave(shost->host_lock, flags);
1041        list_for_each_entry(starget, &shost->__targets, siblings) {
1042                if (starget->state == STARGET_DEL)
1043                        continue;
1044                if (starget->dev.parent == dev || &starget->dev == dev) {
1045                        /* assuming new targets arrive at the end */
1046                        starget->reap_ref++;
1047                        spin_unlock_irqrestore(shost->host_lock, flags);
1048                        if (last)
1049                                scsi_target_reap(last);
1050                        last = starget;
1051                        __scsi_remove_target(starget);
1052                        spin_lock_irqsave(shost->host_lock, flags);
1053                }
1054        }
1055        spin_unlock_irqrestore(shost->host_lock, flags);
1056
1057        if (last)
1058                scsi_target_reap(last);
1059}
1060EXPORT_SYMBOL(scsi_remove_target);
1061
1062int scsi_register_driver(struct device_driver *drv)
1063{
1064        drv->bus = &scsi_bus_type;
1065
1066        return driver_register(drv);
1067}
1068EXPORT_SYMBOL(scsi_register_driver);
1069
1070int scsi_register_interface(struct class_interface *intf)
1071{
1072        intf->class = &sdev_class;
1073
1074        return class_interface_register(intf);
1075}
1076EXPORT_SYMBOL(scsi_register_interface);
1077
1078/**
1079 * scsi_sysfs_add_host - add scsi host to subsystem
1080 * @shost:     scsi host struct to add to subsystem
1081 **/
1082int scsi_sysfs_add_host(struct Scsi_Host *shost)
1083{
1084        int error, i;
1085
1086        /* add host specific attributes */
1087        if (shost->hostt->shost_attrs) {
1088                for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1089                        error = device_create_file(&shost->shost_dev,
1090                                        shost->hostt->shost_attrs[i]);
1091                        if (error)
1092                                return error;
1093                }
1094        }
1095
1096        transport_register_device(&shost->shost_gendev);
1097        transport_configure_device(&shost->shost_gendev);
1098        return 0;
1099}
1100
1101static struct device_type scsi_dev_type = {
1102        .name =         "scsi_device",
1103        .release =      scsi_device_dev_release,
1104        .groups =       scsi_sdev_attr_groups,
1105};
1106
1107void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1108{
1109        unsigned long flags;
1110        struct Scsi_Host *shost = sdev->host;
1111        struct scsi_target  *starget = sdev->sdev_target;
1112
1113        device_initialize(&sdev->sdev_gendev);
1114        sdev->sdev_gendev.bus = &scsi_bus_type;
1115        sdev->sdev_gendev.type = &scsi_dev_type;
1116        dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%d",
1117                     sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1118
1119        device_initialize(&sdev->sdev_dev);
1120        sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1121        sdev->sdev_dev.class = &sdev_class;
1122        dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%d",
1123                     sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1124        sdev->scsi_level = starget->scsi_level;
1125        transport_setup_device(&sdev->sdev_gendev);
1126        spin_lock_irqsave(shost->host_lock, flags);
1127        list_add_tail(&sdev->same_target_siblings, &starget->devices);
1128        list_add_tail(&sdev->siblings, &shost->__devices);
1129        spin_unlock_irqrestore(shost->host_lock, flags);
1130}
1131
1132int scsi_is_sdev_device(const struct device *dev)
1133{
1134        return dev->type == &scsi_dev_type;
1135}
1136EXPORT_SYMBOL(scsi_is_sdev_device);
1137
1138/* A blank transport template that is used in drivers that don't
1139 * yet implement Transport Attributes */
1140struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };
1141
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