thinkpad-acpi: explain errors from acpi_install_notify_handler
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / scsi / scsi_sysfs.c
blob91a93e0ed67a4f3a7853b9a2956419b9fd99c2a3
1 /*
2 * scsi_sysfs.c
4 * SCSI sysfs interface routines.
6 * Created to pull SCSI mid layer sysfs routines into one file.
7 */
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/blkdev.h>
12 #include <linux/device.h>
14 #include <scsi/scsi.h>
15 #include <scsi/scsi_device.h>
16 #include <scsi/scsi_host.h>
17 #include <scsi/scsi_tcq.h>
18 #include <scsi/scsi_transport.h>
19 #include <scsi/scsi_driver.h>
21 #include "scsi_priv.h"
22 #include "scsi_logging.h"
24 static struct device_type scsi_dev_type;
26 static const struct {
27 enum scsi_device_state value;
28 char *name;
29 } sdev_states[] = {
30 { SDEV_CREATED, "created" },
31 { SDEV_RUNNING, "running" },
32 { SDEV_CANCEL, "cancel" },
33 { SDEV_DEL, "deleted" },
34 { SDEV_QUIESCE, "quiesce" },
35 { SDEV_OFFLINE, "offline" },
36 { SDEV_BLOCK, "blocked" },
37 { SDEV_CREATED_BLOCK, "created-blocked" },
40 const char *scsi_device_state_name(enum scsi_device_state state)
42 int i;
43 char *name = NULL;
45 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
46 if (sdev_states[i].value == state) {
47 name = sdev_states[i].name;
48 break;
51 return name;
54 static const struct {
55 enum scsi_host_state value;
56 char *name;
57 } shost_states[] = {
58 { SHOST_CREATED, "created" },
59 { SHOST_RUNNING, "running" },
60 { SHOST_CANCEL, "cancel" },
61 { SHOST_DEL, "deleted" },
62 { SHOST_RECOVERY, "recovery" },
63 { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
64 { SHOST_DEL_RECOVERY, "deleted/recovery", },
66 const char *scsi_host_state_name(enum scsi_host_state state)
68 int i;
69 char *name = NULL;
71 for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
72 if (shost_states[i].value == state) {
73 name = shost_states[i].name;
74 break;
77 return name;
80 static int check_set(unsigned int *val, char *src)
82 char *last;
84 if (strncmp(src, "-", 20) == 0) {
85 *val = SCAN_WILD_CARD;
86 } else {
88 * Doesn't check for int overflow
90 *val = simple_strtoul(src, &last, 0);
91 if (*last != '\0')
92 return 1;
94 return 0;
97 static int scsi_scan(struct Scsi_Host *shost, const char *str)
99 char s1[15], s2[15], s3[15], junk;
100 unsigned int channel, id, lun;
101 int res;
103 res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk);
104 if (res != 3)
105 return -EINVAL;
106 if (check_set(&channel, s1))
107 return -EINVAL;
108 if (check_set(&id, s2))
109 return -EINVAL;
110 if (check_set(&lun, s3))
111 return -EINVAL;
112 if (shost->transportt->user_scan)
113 res = shost->transportt->user_scan(shost, channel, id, lun);
114 else
115 res = scsi_scan_host_selected(shost, channel, id, lun, 1);
116 return res;
120 * shost_show_function: macro to create an attr function that can be used to
121 * show a non-bit field.
123 #define shost_show_function(name, field, format_string) \
124 static ssize_t \
125 show_##name (struct device *dev, struct device_attribute *attr, \
126 char *buf) \
128 struct Scsi_Host *shost = class_to_shost(dev); \
129 return snprintf (buf, 20, format_string, shost->field); \
133 * shost_rd_attr: macro to create a function and attribute variable for a
134 * read only field.
136 #define shost_rd_attr2(name, field, format_string) \
137 shost_show_function(name, field, format_string) \
138 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
140 #define shost_rd_attr(field, format_string) \
141 shost_rd_attr2(field, field, format_string)
144 * Create the actual show/store functions and data structures.
147 static ssize_t
148 store_scan(struct device *dev, struct device_attribute *attr,
149 const char *buf, size_t count)
151 struct Scsi_Host *shost = class_to_shost(dev);
152 int res;
154 res = scsi_scan(shost, buf);
155 if (res == 0)
156 res = count;
157 return res;
159 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
161 static ssize_t
162 store_shost_state(struct device *dev, struct device_attribute *attr,
163 const char *buf, size_t count)
165 int i;
166 struct Scsi_Host *shost = class_to_shost(dev);
167 enum scsi_host_state state = 0;
169 for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
170 const int len = strlen(shost_states[i].name);
171 if (strncmp(shost_states[i].name, buf, len) == 0 &&
172 buf[len] == '\n') {
173 state = shost_states[i].value;
174 break;
177 if (!state)
178 return -EINVAL;
180 if (scsi_host_set_state(shost, state))
181 return -EINVAL;
182 return count;
185 static ssize_t
186 show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
188 struct Scsi_Host *shost = class_to_shost(dev);
189 const char *name = scsi_host_state_name(shost->shost_state);
191 if (!name)
192 return -EINVAL;
194 return snprintf(buf, 20, "%s\n", name);
197 /* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
198 struct device_attribute dev_attr_hstate =
199 __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
201 static ssize_t
202 show_shost_mode(unsigned int mode, char *buf)
204 ssize_t len = 0;
206 if (mode & MODE_INITIATOR)
207 len = sprintf(buf, "%s", "Initiator");
209 if (mode & MODE_TARGET)
210 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
212 len += sprintf(buf + len, "\n");
214 return len;
217 static ssize_t
218 show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
219 char *buf)
221 struct Scsi_Host *shost = class_to_shost(dev);
222 unsigned int supported_mode = shost->hostt->supported_mode;
224 if (supported_mode == MODE_UNKNOWN)
225 /* by default this should be initiator */
226 supported_mode = MODE_INITIATOR;
228 return show_shost_mode(supported_mode, buf);
231 static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
233 static ssize_t
234 show_shost_active_mode(struct device *dev,
235 struct device_attribute *attr, char *buf)
237 struct Scsi_Host *shost = class_to_shost(dev);
239 if (shost->active_mode == MODE_UNKNOWN)
240 return snprintf(buf, 20, "unknown\n");
241 else
242 return show_shost_mode(shost->active_mode, buf);
245 static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
247 shost_rd_attr(unique_id, "%u\n");
248 shost_rd_attr(host_busy, "%hu\n");
249 shost_rd_attr(cmd_per_lun, "%hd\n");
250 shost_rd_attr(can_queue, "%hd\n");
251 shost_rd_attr(sg_tablesize, "%hu\n");
252 shost_rd_attr(unchecked_isa_dma, "%d\n");
253 shost_rd_attr(prot_capabilities, "%u\n");
254 shost_rd_attr(prot_guard_type, "%hd\n");
255 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
257 static struct attribute *scsi_sysfs_shost_attrs[] = {
258 &dev_attr_unique_id.attr,
259 &dev_attr_host_busy.attr,
260 &dev_attr_cmd_per_lun.attr,
261 &dev_attr_can_queue.attr,
262 &dev_attr_sg_tablesize.attr,
263 &dev_attr_unchecked_isa_dma.attr,
264 &dev_attr_proc_name.attr,
265 &dev_attr_scan.attr,
266 &dev_attr_hstate.attr,
267 &dev_attr_supported_mode.attr,
268 &dev_attr_active_mode.attr,
269 &dev_attr_prot_capabilities.attr,
270 &dev_attr_prot_guard_type.attr,
271 NULL
274 struct attribute_group scsi_shost_attr_group = {
275 .attrs = scsi_sysfs_shost_attrs,
278 const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
279 &scsi_shost_attr_group,
280 NULL
283 static void scsi_device_cls_release(struct device *class_dev)
285 struct scsi_device *sdev;
287 sdev = class_to_sdev(class_dev);
288 put_device(&sdev->sdev_gendev);
291 static void scsi_device_dev_release_usercontext(struct work_struct *work)
293 struct scsi_device *sdev;
294 struct device *parent;
295 struct scsi_target *starget;
296 struct list_head *this, *tmp;
297 unsigned long flags;
299 sdev = container_of(work, struct scsi_device, ew.work);
301 parent = sdev->sdev_gendev.parent;
302 starget = to_scsi_target(parent);
304 spin_lock_irqsave(sdev->host->host_lock, flags);
305 starget->reap_ref++;
306 list_del(&sdev->siblings);
307 list_del(&sdev->same_target_siblings);
308 list_del(&sdev->starved_entry);
309 spin_unlock_irqrestore(sdev->host->host_lock, flags);
311 cancel_work_sync(&sdev->event_work);
313 list_for_each_safe(this, tmp, &sdev->event_list) {
314 struct scsi_event *evt;
316 evt = list_entry(this, struct scsi_event, node);
317 list_del(&evt->node);
318 kfree(evt);
321 blk_put_queue(sdev->request_queue);
322 /* NULL queue means the device can't be used */
323 sdev->request_queue = NULL;
325 scsi_target_reap(scsi_target(sdev));
327 kfree(sdev->inquiry);
328 kfree(sdev);
330 if (parent)
331 put_device(parent);
334 static void scsi_device_dev_release(struct device *dev)
336 struct scsi_device *sdp = to_scsi_device(dev);
337 execute_in_process_context(scsi_device_dev_release_usercontext,
338 &sdp->ew);
341 static struct class sdev_class = {
342 .name = "scsi_device",
343 .dev_release = scsi_device_cls_release,
346 /* all probing is done in the individual ->probe routines */
347 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
349 struct scsi_device *sdp;
351 if (dev->type != &scsi_dev_type)
352 return 0;
354 sdp = to_scsi_device(dev);
355 if (sdp->no_uld_attach)
356 return 0;
357 return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
360 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
362 struct scsi_device *sdev;
364 if (dev->type != &scsi_dev_type)
365 return 0;
367 sdev = to_scsi_device(dev);
369 add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
370 return 0;
373 static int scsi_bus_suspend(struct device * dev, pm_message_t state)
375 struct device_driver *drv;
376 struct scsi_device *sdev;
377 int err;
379 if (dev->type != &scsi_dev_type)
380 return 0;
382 drv = dev->driver;
383 sdev = to_scsi_device(dev);
385 err = scsi_device_quiesce(sdev);
386 if (err)
387 return err;
389 if (drv && drv->suspend) {
390 err = drv->suspend(dev, state);
391 if (err)
392 return err;
395 return 0;
398 static int scsi_bus_resume(struct device * dev)
400 struct device_driver *drv;
401 struct scsi_device *sdev;
402 int err = 0;
404 if (dev->type != &scsi_dev_type)
405 return 0;
407 drv = dev->driver;
408 sdev = to_scsi_device(dev);
410 if (drv && drv->resume)
411 err = drv->resume(dev);
413 scsi_device_resume(sdev);
415 return err;
418 struct bus_type scsi_bus_type = {
419 .name = "scsi",
420 .match = scsi_bus_match,
421 .uevent = scsi_bus_uevent,
422 .suspend = scsi_bus_suspend,
423 .resume = scsi_bus_resume,
425 EXPORT_SYMBOL_GPL(scsi_bus_type);
427 int scsi_sysfs_register(void)
429 int error;
431 error = bus_register(&scsi_bus_type);
432 if (!error) {
433 error = class_register(&sdev_class);
434 if (error)
435 bus_unregister(&scsi_bus_type);
438 return error;
441 void scsi_sysfs_unregister(void)
443 class_unregister(&sdev_class);
444 bus_unregister(&scsi_bus_type);
448 * sdev_show_function: macro to create an attr function that can be used to
449 * show a non-bit field.
451 #define sdev_show_function(field, format_string) \
452 static ssize_t \
453 sdev_show_##field (struct device *dev, struct device_attribute *attr, \
454 char *buf) \
456 struct scsi_device *sdev; \
457 sdev = to_scsi_device(dev); \
458 return snprintf (buf, 20, format_string, sdev->field); \
462 * sdev_rd_attr: macro to create a function and attribute variable for a
463 * read only field.
465 #define sdev_rd_attr(field, format_string) \
466 sdev_show_function(field, format_string) \
467 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
471 * sdev_rd_attr: create a function and attribute variable for a
472 * read/write field.
474 #define sdev_rw_attr(field, format_string) \
475 sdev_show_function(field, format_string) \
477 static ssize_t \
478 sdev_store_##field (struct device *dev, struct device_attribute *attr, \
479 const char *buf, size_t count) \
481 struct scsi_device *sdev; \
482 sdev = to_scsi_device(dev); \
483 snscanf (buf, 20, format_string, &sdev->field); \
484 return count; \
486 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
488 /* Currently we don't export bit fields, but we might in future,
489 * so leave this code in */
490 #if 0
492 * sdev_rd_attr: create a function and attribute variable for a
493 * read/write bit field.
495 #define sdev_rw_attr_bit(field) \
496 sdev_show_function(field, "%d\n") \
498 static ssize_t \
499 sdev_store_##field (struct device *dev, struct device_attribute *attr, \
500 const char *buf, size_t count) \
502 int ret; \
503 struct scsi_device *sdev; \
504 ret = scsi_sdev_check_buf_bit(buf); \
505 if (ret >= 0) { \
506 sdev = to_scsi_device(dev); \
507 sdev->field = ret; \
508 ret = count; \
510 return ret; \
512 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
515 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
516 * else return -EINVAL.
518 static int scsi_sdev_check_buf_bit(const char *buf)
520 if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
521 if (buf[0] == '1')
522 return 1;
523 else if (buf[0] == '0')
524 return 0;
525 else
526 return -EINVAL;
527 } else
528 return -EINVAL;
530 #endif
532 * Create the actual show/store functions and data structures.
534 sdev_rd_attr (device_blocked, "%d\n");
535 sdev_rd_attr (queue_depth, "%d\n");
536 sdev_rd_attr (type, "%d\n");
537 sdev_rd_attr (scsi_level, "%d\n");
538 sdev_rd_attr (vendor, "%.8s\n");
539 sdev_rd_attr (model, "%.16s\n");
540 sdev_rd_attr (rev, "%.4s\n");
543 * TODO: can we make these symlinks to the block layer ones?
545 static ssize_t
546 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
548 struct scsi_device *sdev;
549 sdev = to_scsi_device(dev);
550 return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
553 static ssize_t
554 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
555 const char *buf, size_t count)
557 struct scsi_device *sdev;
558 int timeout;
559 sdev = to_scsi_device(dev);
560 sscanf (buf, "%d\n", &timeout);
561 blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
562 return count;
564 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
566 static ssize_t
567 store_rescan_field (struct device *dev, struct device_attribute *attr,
568 const char *buf, size_t count)
570 scsi_rescan_device(dev);
571 return count;
573 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
575 static void sdev_store_delete_callback(struct device *dev)
577 scsi_remove_device(to_scsi_device(dev));
580 static ssize_t
581 sdev_store_delete(struct device *dev, struct device_attribute *attr,
582 const char *buf, size_t count)
584 int rc;
586 /* An attribute cannot be unregistered by one of its own methods,
587 * so we have to use this roundabout approach.
589 rc = device_schedule_callback(dev, sdev_store_delete_callback);
590 if (rc)
591 count = rc;
592 return count;
594 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
596 static ssize_t
597 store_state_field(struct device *dev, struct device_attribute *attr,
598 const char *buf, size_t count)
600 int i;
601 struct scsi_device *sdev = to_scsi_device(dev);
602 enum scsi_device_state state = 0;
604 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
605 const int len = strlen(sdev_states[i].name);
606 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
607 buf[len] == '\n') {
608 state = sdev_states[i].value;
609 break;
612 if (!state)
613 return -EINVAL;
615 if (scsi_device_set_state(sdev, state))
616 return -EINVAL;
617 return count;
620 static ssize_t
621 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
623 struct scsi_device *sdev = to_scsi_device(dev);
624 const char *name = scsi_device_state_name(sdev->sdev_state);
626 if (!name)
627 return -EINVAL;
629 return snprintf(buf, 20, "%s\n", name);
632 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
634 static ssize_t
635 show_queue_type_field(struct device *dev, struct device_attribute *attr,
636 char *buf)
638 struct scsi_device *sdev = to_scsi_device(dev);
639 const char *name = "none";
641 if (sdev->ordered_tags)
642 name = "ordered";
643 else if (sdev->simple_tags)
644 name = "simple";
646 return snprintf(buf, 20, "%s\n", name);
649 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
651 static ssize_t
652 show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf)
654 return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
657 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
659 #define show_sdev_iostat(field) \
660 static ssize_t \
661 show_iostat_##field(struct device *dev, struct device_attribute *attr, \
662 char *buf) \
664 struct scsi_device *sdev = to_scsi_device(dev); \
665 unsigned long long count = atomic_read(&sdev->field); \
666 return snprintf(buf, 20, "0x%llx\n", count); \
668 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
670 show_sdev_iostat(iorequest_cnt);
671 show_sdev_iostat(iodone_cnt);
672 show_sdev_iostat(ioerr_cnt);
674 static ssize_t
675 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
677 struct scsi_device *sdev;
678 sdev = to_scsi_device(dev);
679 return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
681 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
683 #define DECLARE_EVT_SHOW(name, Cap_name) \
684 static ssize_t \
685 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
686 char *buf) \
688 struct scsi_device *sdev = to_scsi_device(dev); \
689 int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
690 return snprintf(buf, 20, "%d\n", val); \
693 #define DECLARE_EVT_STORE(name, Cap_name) \
694 static ssize_t \
695 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
696 const char *buf, size_t count) \
698 struct scsi_device *sdev = to_scsi_device(dev); \
699 int val = simple_strtoul(buf, NULL, 0); \
700 if (val == 0) \
701 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
702 else if (val == 1) \
703 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
704 else \
705 return -EINVAL; \
706 return count; \
709 #define DECLARE_EVT(name, Cap_name) \
710 DECLARE_EVT_SHOW(name, Cap_name) \
711 DECLARE_EVT_STORE(name, Cap_name) \
712 static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name, \
713 sdev_store_evt_##name);
714 #define REF_EVT(name) &dev_attr_evt_##name.attr
716 DECLARE_EVT(media_change, MEDIA_CHANGE)
718 /* Default template for device attributes. May NOT be modified */
719 static struct attribute *scsi_sdev_attrs[] = {
720 &dev_attr_device_blocked.attr,
721 &dev_attr_type.attr,
722 &dev_attr_scsi_level.attr,
723 &dev_attr_vendor.attr,
724 &dev_attr_model.attr,
725 &dev_attr_rev.attr,
726 &dev_attr_rescan.attr,
727 &dev_attr_delete.attr,
728 &dev_attr_state.attr,
729 &dev_attr_timeout.attr,
730 &dev_attr_iocounterbits.attr,
731 &dev_attr_iorequest_cnt.attr,
732 &dev_attr_iodone_cnt.attr,
733 &dev_attr_ioerr_cnt.attr,
734 &dev_attr_modalias.attr,
735 REF_EVT(media_change),
736 NULL
739 static struct attribute_group scsi_sdev_attr_group = {
740 .attrs = scsi_sdev_attrs,
743 static const struct attribute_group *scsi_sdev_attr_groups[] = {
744 &scsi_sdev_attr_group,
745 NULL
748 static ssize_t
749 sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
750 const char *buf, size_t count)
752 int depth, retval;
753 struct scsi_device *sdev = to_scsi_device(dev);
754 struct scsi_host_template *sht = sdev->host->hostt;
756 if (!sht->change_queue_depth)
757 return -EINVAL;
759 depth = simple_strtoul(buf, NULL, 0);
761 if (depth < 1)
762 return -EINVAL;
764 retval = sht->change_queue_depth(sdev, depth);
765 if (retval < 0)
766 return retval;
768 return count;
771 static struct device_attribute sdev_attr_queue_depth_rw =
772 __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
773 sdev_store_queue_depth_rw);
775 static ssize_t
776 sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
777 const char *buf, size_t count)
779 struct scsi_device *sdev = to_scsi_device(dev);
780 struct scsi_host_template *sht = sdev->host->hostt;
781 int tag_type = 0, retval;
782 int prev_tag_type = scsi_get_tag_type(sdev);
784 if (!sdev->tagged_supported || !sht->change_queue_type)
785 return -EINVAL;
787 if (strncmp(buf, "ordered", 7) == 0)
788 tag_type = MSG_ORDERED_TAG;
789 else if (strncmp(buf, "simple", 6) == 0)
790 tag_type = MSG_SIMPLE_TAG;
791 else if (strncmp(buf, "none", 4) != 0)
792 return -EINVAL;
794 if (tag_type == prev_tag_type)
795 return count;
797 retval = sht->change_queue_type(sdev, tag_type);
798 if (retval < 0)
799 return retval;
801 return count;
804 static int scsi_target_add(struct scsi_target *starget)
806 int error;
808 if (starget->state != STARGET_CREATED)
809 return 0;
811 error = device_add(&starget->dev);
812 if (error) {
813 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
814 get_device(&starget->dev);
815 scsi_target_reap(starget);
816 put_device(&starget->dev);
817 return error;
819 transport_add_device(&starget->dev);
820 starget->state = STARGET_RUNNING;
822 return 0;
825 static struct device_attribute sdev_attr_queue_type_rw =
826 __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
827 sdev_store_queue_type_rw);
830 * scsi_sysfs_add_sdev - add scsi device to sysfs
831 * @sdev: scsi_device to add
833 * Return value:
834 * 0 on Success / non-zero on Failure
836 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
838 int error, i;
839 struct request_queue *rq = sdev->request_queue;
840 struct scsi_target *starget = sdev->sdev_target;
842 error = scsi_device_set_state(sdev, SDEV_RUNNING);
843 if (error)
844 return error;
846 error = scsi_target_add(starget);
847 if (error)
848 return error;
850 transport_configure_device(&starget->dev);
851 error = device_add(&sdev->sdev_gendev);
852 if (error) {
853 printk(KERN_INFO "error 1\n");
854 return error;
856 error = device_add(&sdev->sdev_dev);
857 if (error) {
858 printk(KERN_INFO "error 2\n");
859 device_del(&sdev->sdev_gendev);
860 return error;
862 transport_add_device(&sdev->sdev_gendev);
863 sdev->is_visible = 1;
865 /* create queue files, which may be writable, depending on the host */
866 if (sdev->host->hostt->change_queue_depth)
867 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_depth_rw);
868 else
869 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
870 if (error)
871 return error;
873 if (sdev->host->hostt->change_queue_type)
874 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
875 else
876 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
877 if (error)
878 return error;
880 error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
882 if (error)
883 /* we're treating error on bsg register as non-fatal,
884 * so pretend nothing went wrong */
885 sdev_printk(KERN_INFO, sdev,
886 "Failed to register bsg queue, errno=%d\n", error);
888 /* add additional host specific attributes */
889 if (sdev->host->hostt->sdev_attrs) {
890 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
891 error = device_create_file(&sdev->sdev_gendev,
892 sdev->host->hostt->sdev_attrs[i]);
893 if (error)
894 return error;
898 return error;
901 void __scsi_remove_device(struct scsi_device *sdev)
903 struct device *dev = &sdev->sdev_gendev;
905 if (sdev->is_visible) {
906 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
907 return;
909 bsg_unregister_queue(sdev->request_queue);
910 device_unregister(&sdev->sdev_dev);
911 transport_remove_device(dev);
912 device_del(dev);
913 } else
914 put_device(&sdev->sdev_dev);
915 scsi_device_set_state(sdev, SDEV_DEL);
916 if (sdev->host->hostt->slave_destroy)
917 sdev->host->hostt->slave_destroy(sdev);
918 transport_destroy_device(dev);
920 /* cause the request function to reject all I/O requests */
921 sdev->request_queue->queuedata = NULL;
923 /* Freeing the queue signals to block that we're done */
924 scsi_free_queue(sdev->request_queue);
925 put_device(dev);
929 * scsi_remove_device - unregister a device from the scsi bus
930 * @sdev: scsi_device to unregister
932 void scsi_remove_device(struct scsi_device *sdev)
934 struct Scsi_Host *shost = sdev->host;
936 mutex_lock(&shost->scan_mutex);
937 __scsi_remove_device(sdev);
938 mutex_unlock(&shost->scan_mutex);
940 EXPORT_SYMBOL(scsi_remove_device);
942 static void __scsi_remove_target(struct scsi_target *starget)
944 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
945 unsigned long flags;
946 struct scsi_device *sdev;
948 spin_lock_irqsave(shost->host_lock, flags);
949 starget->reap_ref++;
950 restart:
951 list_for_each_entry(sdev, &shost->__devices, siblings) {
952 if (sdev->channel != starget->channel ||
953 sdev->id != starget->id ||
954 scsi_device_get(sdev))
955 continue;
956 spin_unlock_irqrestore(shost->host_lock, flags);
957 scsi_remove_device(sdev);
958 scsi_device_put(sdev);
959 spin_lock_irqsave(shost->host_lock, flags);
960 goto restart;
962 spin_unlock_irqrestore(shost->host_lock, flags);
963 scsi_target_reap(starget);
966 static int __remove_child (struct device * dev, void * data)
968 if (scsi_is_target_device(dev))
969 __scsi_remove_target(to_scsi_target(dev));
970 return 0;
974 * scsi_remove_target - try to remove a target and all its devices
975 * @dev: generic starget or parent of generic stargets to be removed
977 * Note: This is slightly racy. It is possible that if the user
978 * requests the addition of another device then the target won't be
979 * removed.
981 void scsi_remove_target(struct device *dev)
983 struct device *rdev;
985 if (scsi_is_target_device(dev)) {
986 __scsi_remove_target(to_scsi_target(dev));
987 return;
990 rdev = get_device(dev);
991 device_for_each_child(dev, NULL, __remove_child);
992 put_device(rdev);
994 EXPORT_SYMBOL(scsi_remove_target);
996 int scsi_register_driver(struct device_driver *drv)
998 drv->bus = &scsi_bus_type;
1000 return driver_register(drv);
1002 EXPORT_SYMBOL(scsi_register_driver);
1004 int scsi_register_interface(struct class_interface *intf)
1006 intf->class = &sdev_class;
1008 return class_interface_register(intf);
1010 EXPORT_SYMBOL(scsi_register_interface);
1013 * scsi_sysfs_add_host - add scsi host to subsystem
1014 * @shost: scsi host struct to add to subsystem
1016 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1018 int error, i;
1020 /* add host specific attributes */
1021 if (shost->hostt->shost_attrs) {
1022 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1023 error = device_create_file(&shost->shost_dev,
1024 shost->hostt->shost_attrs[i]);
1025 if (error)
1026 return error;
1030 transport_register_device(&shost->shost_gendev);
1031 transport_configure_device(&shost->shost_gendev);
1032 return 0;
1035 static struct device_type scsi_dev_type = {
1036 .name = "scsi_device",
1037 .release = scsi_device_dev_release,
1038 .groups = scsi_sdev_attr_groups,
1041 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1043 unsigned long flags;
1044 struct Scsi_Host *shost = sdev->host;
1045 struct scsi_target *starget = sdev->sdev_target;
1047 device_initialize(&sdev->sdev_gendev);
1048 sdev->sdev_gendev.bus = &scsi_bus_type;
1049 sdev->sdev_gendev.type = &scsi_dev_type;
1050 dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%d",
1051 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1053 device_initialize(&sdev->sdev_dev);
1054 sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1055 sdev->sdev_dev.class = &sdev_class;
1056 dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%d",
1057 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1058 sdev->scsi_level = starget->scsi_level;
1059 transport_setup_device(&sdev->sdev_gendev);
1060 spin_lock_irqsave(shost->host_lock, flags);
1061 list_add_tail(&sdev->same_target_siblings, &starget->devices);
1062 list_add_tail(&sdev->siblings, &shost->__devices);
1063 spin_unlock_irqrestore(shost->host_lock, flags);
1066 int scsi_is_sdev_device(const struct device *dev)
1068 return dev->type == &scsi_dev_type;
1070 EXPORT_SYMBOL(scsi_is_sdev_device);
1072 /* A blank transport template that is used in drivers that don't
1073 * yet implement Transport Attributes */
1074 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };