4 * SCSI sysfs interface routines.
6 * Created to pull SCSI mid layer sysfs routines into one file.
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>
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_dh.h>
21 #include <scsi/scsi_transport.h>
22 #include <scsi/scsi_driver.h>
24 #include "scsi_priv.h"
25 #include "scsi_logging.h"
27 static struct device_type scsi_dev_type;
30 enum scsi_device_state value;
33 { SDEV_CREATED, "created" },
34 { SDEV_RUNNING, "running" },
35 { SDEV_CANCEL, "cancel" },
36 { SDEV_DEL, "deleted" },
37 { SDEV_QUIESCE, "quiesce" },
38 { SDEV_OFFLINE, "offline" },
39 { SDEV_TRANSPORT_OFFLINE, "transport-offline" },
40 { SDEV_BLOCK, "blocked" },
41 { SDEV_CREATED_BLOCK, "created-blocked" },
44 const char *scsi_device_state_name(enum scsi_device_state state)
49 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
50 if (sdev_states[i].value == state) {
51 name = sdev_states[i].name;
59 enum scsi_host_state value;
62 { SHOST_CREATED, "created" },
63 { SHOST_RUNNING, "running" },
64 { SHOST_CANCEL, "cancel" },
65 { SHOST_DEL, "deleted" },
66 { SHOST_RECOVERY, "recovery" },
67 { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
68 { SHOST_DEL_RECOVERY, "deleted/recovery", },
70 const char *scsi_host_state_name(enum scsi_host_state state)
75 for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
76 if (shost_states[i].value == state) {
77 name = shost_states[i].name;
84 static int check_set(unsigned long long *val, char *src)
88 if (strncmp(src, "-", 20) == 0) {
89 *val = SCAN_WILD_CARD;
92 * Doesn't check for int overflow
94 *val = simple_strtoull(src, &last, 0);
101 static int scsi_scan(struct Scsi_Host *shost, const char *str)
103 char s1[15], s2[15], s3[17], junk;
104 unsigned long long channel, id, lun;
107 res = sscanf(str, "%10s %10s %16s %c", s1, s2, s3, &junk);
110 if (check_set(&channel, s1))
112 if (check_set(&id, s2))
114 if (check_set(&lun, s3))
116 if (shost->transportt->user_scan)
117 res = shost->transportt->user_scan(shost, channel, id, lun);
119 res = scsi_scan_host_selected(shost, channel, id, lun, 1);
124 * shost_show_function: macro to create an attr function that can be used to
125 * show a non-bit field.
127 #define shost_show_function(name, field, format_string) \
129 show_##name (struct device *dev, struct device_attribute *attr, \
132 struct Scsi_Host *shost = class_to_shost(dev); \
133 return snprintf (buf, 20, format_string, shost->field); \
137 * shost_rd_attr: macro to create a function and attribute variable for a
140 #define shost_rd_attr2(name, field, format_string) \
141 shost_show_function(name, field, format_string) \
142 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
144 #define shost_rd_attr(field, format_string) \
145 shost_rd_attr2(field, field, format_string)
148 * Create the actual show/store functions and data structures.
152 store_scan(struct device *dev, struct device_attribute *attr,
153 const char *buf, size_t count)
155 struct Scsi_Host *shost = class_to_shost(dev);
158 res = scsi_scan(shost, buf);
163 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
166 store_shost_state(struct device *dev, struct device_attribute *attr,
167 const char *buf, size_t count)
170 struct Scsi_Host *shost = class_to_shost(dev);
171 enum scsi_host_state state = 0;
173 for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
174 const int len = strlen(shost_states[i].name);
175 if (strncmp(shost_states[i].name, buf, len) == 0 &&
177 state = shost_states[i].value;
184 if (scsi_host_set_state(shost, state))
190 show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
192 struct Scsi_Host *shost = class_to_shost(dev);
193 const char *name = scsi_host_state_name(shost->shost_state);
198 return snprintf(buf, 20, "%s\n", name);
201 /* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
202 struct device_attribute dev_attr_hstate =
203 __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
206 show_shost_mode(unsigned int mode, char *buf)
210 if (mode & MODE_INITIATOR)
211 len = sprintf(buf, "%s", "Initiator");
213 if (mode & MODE_TARGET)
214 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
216 len += sprintf(buf + len, "\n");
222 show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
225 struct Scsi_Host *shost = class_to_shost(dev);
226 unsigned int supported_mode = shost->hostt->supported_mode;
228 if (supported_mode == MODE_UNKNOWN)
229 /* by default this should be initiator */
230 supported_mode = MODE_INITIATOR;
232 return show_shost_mode(supported_mode, buf);
235 static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
238 show_shost_active_mode(struct device *dev,
239 struct device_attribute *attr, char *buf)
241 struct Scsi_Host *shost = class_to_shost(dev);
243 if (shost->active_mode == MODE_UNKNOWN)
244 return snprintf(buf, 20, "unknown\n");
246 return show_shost_mode(shost->active_mode, buf);
249 static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
251 static int check_reset_type(const char *str)
253 if (sysfs_streq(str, "adapter"))
254 return SCSI_ADAPTER_RESET;
255 else if (sysfs_streq(str, "firmware"))
256 return SCSI_FIRMWARE_RESET;
262 store_host_reset(struct device *dev, struct device_attribute *attr,
263 const char *buf, size_t count)
265 struct Scsi_Host *shost = class_to_shost(dev);
266 struct scsi_host_template *sht = shost->hostt;
270 type = check_reset_type(buf);
272 goto exit_store_host_reset;
275 ret = sht->host_reset(shost, type);
277 exit_store_host_reset:
283 static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
286 show_shost_eh_deadline(struct device *dev,
287 struct device_attribute *attr, char *buf)
289 struct Scsi_Host *shost = class_to_shost(dev);
291 if (shost->eh_deadline == -1)
292 return snprintf(buf, strlen("off") + 2, "off\n");
293 return sprintf(buf, "%u\n", shost->eh_deadline / HZ);
297 store_shost_eh_deadline(struct device *dev, struct device_attribute *attr,
298 const char *buf, size_t count)
300 struct Scsi_Host *shost = class_to_shost(dev);
302 unsigned long deadline, flags;
304 if (shost->transportt &&
305 (shost->transportt->eh_strategy_handler ||
306 !shost->hostt->eh_host_reset_handler))
309 if (!strncmp(buf, "off", strlen("off")))
312 ret = kstrtoul(buf, 10, &deadline);
315 if (deadline * HZ > UINT_MAX)
319 spin_lock_irqsave(shost->host_lock, flags);
320 if (scsi_host_in_recovery(shost))
324 shost->eh_deadline = -1;
326 shost->eh_deadline = deadline * HZ;
330 spin_unlock_irqrestore(shost->host_lock, flags);
335 static DEVICE_ATTR(eh_deadline, S_IRUGO | S_IWUSR, show_shost_eh_deadline, store_shost_eh_deadline);
337 shost_rd_attr(use_blk_mq, "%d\n");
338 shost_rd_attr(unique_id, "%u\n");
339 shost_rd_attr(cmd_per_lun, "%hd\n");
340 shost_rd_attr(can_queue, "%hd\n");
341 shost_rd_attr(sg_tablesize, "%hu\n");
342 shost_rd_attr(sg_prot_tablesize, "%hu\n");
343 shost_rd_attr(unchecked_isa_dma, "%d\n");
344 shost_rd_attr(prot_capabilities, "%u\n");
345 shost_rd_attr(prot_guard_type, "%hd\n");
346 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
349 show_host_busy(struct device *dev, struct device_attribute *attr, char *buf)
351 struct Scsi_Host *shost = class_to_shost(dev);
352 return snprintf(buf, 20, "%d\n", atomic_read(&shost->host_busy));
354 static DEVICE_ATTR(host_busy, S_IRUGO, show_host_busy, NULL);
356 static struct attribute *scsi_sysfs_shost_attrs[] = {
357 &dev_attr_use_blk_mq.attr,
358 &dev_attr_unique_id.attr,
359 &dev_attr_host_busy.attr,
360 &dev_attr_cmd_per_lun.attr,
361 &dev_attr_can_queue.attr,
362 &dev_attr_sg_tablesize.attr,
363 &dev_attr_sg_prot_tablesize.attr,
364 &dev_attr_unchecked_isa_dma.attr,
365 &dev_attr_proc_name.attr,
367 &dev_attr_hstate.attr,
368 &dev_attr_supported_mode.attr,
369 &dev_attr_active_mode.attr,
370 &dev_attr_prot_capabilities.attr,
371 &dev_attr_prot_guard_type.attr,
372 &dev_attr_host_reset.attr,
373 &dev_attr_eh_deadline.attr,
377 struct attribute_group scsi_shost_attr_group = {
378 .attrs = scsi_sysfs_shost_attrs,
381 const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
382 &scsi_shost_attr_group,
386 static void scsi_device_cls_release(struct device *class_dev)
388 struct scsi_device *sdev;
390 sdev = class_to_sdev(class_dev);
391 put_device(&sdev->sdev_gendev);
394 static void scsi_device_dev_release_usercontext(struct work_struct *work)
396 struct scsi_device *sdev;
397 struct device *parent;
398 struct list_head *this, *tmp;
401 sdev = container_of(work, struct scsi_device, ew.work);
403 scsi_dh_release_device(sdev);
405 parent = sdev->sdev_gendev.parent;
407 spin_lock_irqsave(sdev->host->host_lock, flags);
408 list_del(&sdev->siblings);
409 list_del(&sdev->same_target_siblings);
410 list_del(&sdev->starved_entry);
411 spin_unlock_irqrestore(sdev->host->host_lock, flags);
413 cancel_work_sync(&sdev->event_work);
415 list_for_each_safe(this, tmp, &sdev->event_list) {
416 struct scsi_event *evt;
418 evt = list_entry(this, struct scsi_event, node);
419 list_del(&evt->node);
423 blk_put_queue(sdev->request_queue);
424 /* NULL queue means the device can't be used */
425 sdev->request_queue = NULL;
427 kfree(sdev->vpd_pg83);
428 kfree(sdev->vpd_pg80);
429 kfree(sdev->inquiry);
436 static void scsi_device_dev_release(struct device *dev)
438 struct scsi_device *sdp = to_scsi_device(dev);
439 execute_in_process_context(scsi_device_dev_release_usercontext,
443 static struct class sdev_class = {
444 .name = "scsi_device",
445 .dev_release = scsi_device_cls_release,
448 /* all probing is done in the individual ->probe routines */
449 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
451 struct scsi_device *sdp;
453 if (dev->type != &scsi_dev_type)
456 sdp = to_scsi_device(dev);
457 if (sdp->no_uld_attach)
459 return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
462 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
464 struct scsi_device *sdev;
466 if (dev->type != &scsi_dev_type)
469 sdev = to_scsi_device(dev);
471 add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
475 struct bus_type scsi_bus_type = {
477 .match = scsi_bus_match,
478 .uevent = scsi_bus_uevent,
480 .pm = &scsi_bus_pm_ops,
483 EXPORT_SYMBOL_GPL(scsi_bus_type);
485 int scsi_sysfs_register(void)
489 error = bus_register(&scsi_bus_type);
491 error = class_register(&sdev_class);
493 bus_unregister(&scsi_bus_type);
499 void scsi_sysfs_unregister(void)
501 class_unregister(&sdev_class);
502 bus_unregister(&scsi_bus_type);
506 * sdev_show_function: macro to create an attr function that can be used to
507 * show a non-bit field.
509 #define sdev_show_function(field, format_string) \
511 sdev_show_##field (struct device *dev, struct device_attribute *attr, \
514 struct scsi_device *sdev; \
515 sdev = to_scsi_device(dev); \
516 return snprintf (buf, 20, format_string, sdev->field); \
520 * sdev_rd_attr: macro to create a function and attribute variable for a
523 #define sdev_rd_attr(field, format_string) \
524 sdev_show_function(field, format_string) \
525 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
529 * sdev_rw_attr: create a function and attribute variable for a
532 #define sdev_rw_attr(field, format_string) \
533 sdev_show_function(field, format_string) \
536 sdev_store_##field (struct device *dev, struct device_attribute *attr, \
537 const char *buf, size_t count) \
539 struct scsi_device *sdev; \
540 sdev = to_scsi_device(dev); \
541 sscanf (buf, format_string, &sdev->field); \
544 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
546 /* Currently we don't export bit fields, but we might in future,
547 * so leave this code in */
550 * sdev_rd_attr: create a function and attribute variable for a
551 * read/write bit field.
553 #define sdev_rw_attr_bit(field) \
554 sdev_show_function(field, "%d\n") \
557 sdev_store_##field (struct device *dev, struct device_attribute *attr, \
558 const char *buf, size_t count) \
561 struct scsi_device *sdev; \
562 ret = scsi_sdev_check_buf_bit(buf); \
564 sdev = to_scsi_device(dev); \
570 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
573 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
574 * else return -EINVAL.
576 static int scsi_sdev_check_buf_bit(const char *buf)
578 if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
581 else if (buf[0] == '0')
590 * Create the actual show/store functions and data structures.
592 sdev_rd_attr (type, "%d\n");
593 sdev_rd_attr (scsi_level, "%d\n");
594 sdev_rd_attr (vendor, "%.8s\n");
595 sdev_rd_attr (model, "%.16s\n");
596 sdev_rd_attr (rev, "%.4s\n");
599 sdev_show_device_busy(struct device *dev, struct device_attribute *attr,
602 struct scsi_device *sdev = to_scsi_device(dev);
603 return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_busy));
605 static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL);
608 sdev_show_device_blocked(struct device *dev, struct device_attribute *attr,
611 struct scsi_device *sdev = to_scsi_device(dev);
612 return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_blocked));
614 static DEVICE_ATTR(device_blocked, S_IRUGO, sdev_show_device_blocked, NULL);
617 * TODO: can we make these symlinks to the block layer ones?
620 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
622 struct scsi_device *sdev;
623 sdev = to_scsi_device(dev);
624 return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
628 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
629 const char *buf, size_t count)
631 struct scsi_device *sdev;
633 sdev = to_scsi_device(dev);
634 sscanf (buf, "%d\n", &timeout);
635 blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
638 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
641 sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
643 struct scsi_device *sdev;
644 sdev = to_scsi_device(dev);
645 return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
649 sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
650 const char *buf, size_t count)
652 struct scsi_device *sdev;
653 unsigned int eh_timeout;
656 if (!capable(CAP_SYS_ADMIN))
659 sdev = to_scsi_device(dev);
660 err = kstrtouint(buf, 10, &eh_timeout);
663 sdev->eh_timeout = eh_timeout * HZ;
667 static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
670 store_rescan_field (struct device *dev, struct device_attribute *attr,
671 const char *buf, size_t count)
673 scsi_rescan_device(dev);
676 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
679 sdev_store_delete(struct device *dev, struct device_attribute *attr,
680 const char *buf, size_t count)
682 if (device_remove_file_self(dev, attr))
683 scsi_remove_device(to_scsi_device(dev));
686 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
689 store_state_field(struct device *dev, struct device_attribute *attr,
690 const char *buf, size_t count)
693 struct scsi_device *sdev = to_scsi_device(dev);
694 enum scsi_device_state state = 0;
696 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
697 const int len = strlen(sdev_states[i].name);
698 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
700 state = sdev_states[i].value;
707 if (scsi_device_set_state(sdev, state))
713 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
715 struct scsi_device *sdev = to_scsi_device(dev);
716 const char *name = scsi_device_state_name(sdev->sdev_state);
721 return snprintf(buf, 20, "%s\n", name);
724 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
727 show_queue_type_field(struct device *dev, struct device_attribute *attr,
730 struct scsi_device *sdev = to_scsi_device(dev);
731 const char *name = "none";
733 if (sdev->simple_tags)
736 return snprintf(buf, 20, "%s\n", name);
740 store_queue_type_field(struct device *dev, struct device_attribute *attr,
741 const char *buf, size_t count)
743 struct scsi_device *sdev = to_scsi_device(dev);
745 if (!sdev->tagged_supported)
748 sdev_printk(KERN_INFO, sdev,
749 "ignoring write to deprecated queue_type attribute");
753 static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
754 store_queue_type_field);
756 #define sdev_vpd_pg_attr(_page) \
758 show_vpd_##_page(struct file *filp, struct kobject *kobj, \
759 struct bin_attribute *bin_attr, \
760 char *buf, loff_t off, size_t count) \
762 struct device *dev = container_of(kobj, struct device, kobj); \
763 struct scsi_device *sdev = to_scsi_device(dev); \
765 if (!sdev->vpd_##_page) \
768 ret = memory_read_from_buffer(buf, count, &off, \
769 rcu_dereference(sdev->vpd_##_page), \
770 sdev->vpd_##_page##_len); \
774 static struct bin_attribute dev_attr_vpd_##_page = { \
775 .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO }, \
777 .read = show_vpd_##_page, \
780 sdev_vpd_pg_attr(pg83);
781 sdev_vpd_pg_attr(pg80);
783 static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
784 struct bin_attribute *bin_attr,
785 char *buf, loff_t off, size_t count)
787 struct device *dev = container_of(kobj, struct device, kobj);
788 struct scsi_device *sdev = to_scsi_device(dev);
793 return memory_read_from_buffer(buf, count, &off, sdev->inquiry,
797 static struct bin_attribute dev_attr_inquiry = {
803 .read = show_inquiry,
807 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
810 return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
813 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
815 #define show_sdev_iostat(field) \
817 show_iostat_##field(struct device *dev, struct device_attribute *attr, \
820 struct scsi_device *sdev = to_scsi_device(dev); \
821 unsigned long long count = atomic_read(&sdev->field); \
822 return snprintf(buf, 20, "0x%llx\n", count); \
824 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
826 show_sdev_iostat(iorequest_cnt);
827 show_sdev_iostat(iodone_cnt);
828 show_sdev_iostat(ioerr_cnt);
831 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
833 struct scsi_device *sdev;
834 sdev = to_scsi_device(dev);
835 return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
837 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
839 #define DECLARE_EVT_SHOW(name, Cap_name) \
841 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
844 struct scsi_device *sdev = to_scsi_device(dev); \
845 int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
846 return snprintf(buf, 20, "%d\n", val); \
849 #define DECLARE_EVT_STORE(name, Cap_name) \
851 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
852 const char *buf, size_t count) \
854 struct scsi_device *sdev = to_scsi_device(dev); \
855 int val = simple_strtoul(buf, NULL, 0); \
857 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
859 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
865 #define DECLARE_EVT(name, Cap_name) \
866 DECLARE_EVT_SHOW(name, Cap_name) \
867 DECLARE_EVT_STORE(name, Cap_name) \
868 static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name, \
869 sdev_store_evt_##name);
870 #define REF_EVT(name) &dev_attr_evt_##name.attr
872 DECLARE_EVT(media_change, MEDIA_CHANGE)
873 DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
874 DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
875 DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
876 DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
877 DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
880 sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
881 const char *buf, size_t count)
884 struct scsi_device *sdev = to_scsi_device(dev);
885 struct scsi_host_template *sht = sdev->host->hostt;
887 if (!sht->change_queue_depth)
890 depth = simple_strtoul(buf, NULL, 0);
892 if (depth < 1 || depth > sdev->host->can_queue)
895 retval = sht->change_queue_depth(sdev, depth);
899 sdev->max_queue_depth = sdev->queue_depth;
903 sdev_show_function(queue_depth, "%d\n");
905 static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
906 sdev_store_queue_depth);
909 sdev_show_wwid(struct device *dev, struct device_attribute *attr,
912 struct scsi_device *sdev = to_scsi_device(dev);
915 count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
922 static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
924 #ifdef CONFIG_SCSI_DH
926 sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
929 struct scsi_device *sdev = to_scsi_device(dev);
932 return snprintf(buf, 20, "detached\n");
934 return snprintf(buf, 20, "%s\n", sdev->handler->name);
938 sdev_store_dh_state(struct device *dev, struct device_attribute *attr,
939 const char *buf, size_t count)
941 struct scsi_device *sdev = to_scsi_device(dev);
944 if (sdev->sdev_state == SDEV_CANCEL ||
945 sdev->sdev_state == SDEV_DEL)
948 if (!sdev->handler) {
950 * Attach to a device handler
952 err = scsi_dh_attach(sdev->request_queue, buf);
953 } else if (!strncmp(buf, "activate", 8)) {
955 * Activate a device handler
957 if (sdev->handler->activate)
958 err = sdev->handler->activate(sdev, NULL, NULL);
961 } else if (!strncmp(buf, "detach", 6)) {
963 * Detach from a device handler
965 sdev_printk(KERN_WARNING, sdev,
966 "can't detach handler %s.\n",
967 sdev->handler->name);
971 return err < 0 ? err : count;
974 static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
975 sdev_store_dh_state);
979 sdev_show_queue_ramp_up_period(struct device *dev,
980 struct device_attribute *attr,
983 struct scsi_device *sdev;
984 sdev = to_scsi_device(dev);
985 return snprintf(buf, 20, "%u\n",
986 jiffies_to_msecs(sdev->queue_ramp_up_period));
990 sdev_store_queue_ramp_up_period(struct device *dev,
991 struct device_attribute *attr,
992 const char *buf, size_t count)
994 struct scsi_device *sdev = to_scsi_device(dev);
997 if (kstrtouint(buf, 10, &period))
1000 sdev->queue_ramp_up_period = msecs_to_jiffies(period);
1004 static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
1005 sdev_show_queue_ramp_up_period,
1006 sdev_store_queue_ramp_up_period);
1008 static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
1009 struct attribute *attr, int i)
1011 struct device *dev = container_of(kobj, struct device, kobj);
1012 struct scsi_device *sdev = to_scsi_device(dev);
1015 if (attr == &dev_attr_queue_depth.attr &&
1016 !sdev->host->hostt->change_queue_depth)
1019 if (attr == &dev_attr_queue_ramp_up_period.attr &&
1020 !sdev->host->hostt->change_queue_depth)
1026 /* Default template for device attributes. May NOT be modified */
1027 static struct attribute *scsi_sdev_attrs[] = {
1028 &dev_attr_device_blocked.attr,
1029 &dev_attr_type.attr,
1030 &dev_attr_scsi_level.attr,
1031 &dev_attr_device_busy.attr,
1032 &dev_attr_vendor.attr,
1033 &dev_attr_model.attr,
1035 &dev_attr_rescan.attr,
1036 &dev_attr_delete.attr,
1037 &dev_attr_state.attr,
1038 &dev_attr_timeout.attr,
1039 &dev_attr_eh_timeout.attr,
1040 &dev_attr_iocounterbits.attr,
1041 &dev_attr_iorequest_cnt.attr,
1042 &dev_attr_iodone_cnt.attr,
1043 &dev_attr_ioerr_cnt.attr,
1044 &dev_attr_modalias.attr,
1045 &dev_attr_queue_depth.attr,
1046 &dev_attr_queue_type.attr,
1047 &dev_attr_wwid.attr,
1048 #ifdef CONFIG_SCSI_DH
1049 &dev_attr_dh_state.attr,
1051 &dev_attr_queue_ramp_up_period.attr,
1052 REF_EVT(media_change),
1053 REF_EVT(inquiry_change_reported),
1054 REF_EVT(capacity_change_reported),
1055 REF_EVT(soft_threshold_reached),
1056 REF_EVT(mode_parameter_change_reported),
1057 REF_EVT(lun_change_reported),
1061 static struct bin_attribute *scsi_sdev_bin_attrs[] = {
1067 static struct attribute_group scsi_sdev_attr_group = {
1068 .attrs = scsi_sdev_attrs,
1069 .bin_attrs = scsi_sdev_bin_attrs,
1070 .is_visible = scsi_sdev_attr_is_visible,
1073 static const struct attribute_group *scsi_sdev_attr_groups[] = {
1074 &scsi_sdev_attr_group,
1078 static int scsi_target_add(struct scsi_target *starget)
1082 if (starget->state != STARGET_CREATED)
1085 error = device_add(&starget->dev);
1087 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
1090 transport_add_device(&starget->dev);
1091 starget->state = STARGET_RUNNING;
1093 pm_runtime_set_active(&starget->dev);
1094 pm_runtime_enable(&starget->dev);
1095 device_enable_async_suspend(&starget->dev);
1101 * scsi_sysfs_add_sdev - add scsi device to sysfs
1102 * @sdev: scsi_device to add
1105 * 0 on Success / non-zero on Failure
1107 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1110 struct request_queue *rq = sdev->request_queue;
1111 struct scsi_target *starget = sdev->sdev_target;
1113 error = scsi_device_set_state(sdev, SDEV_RUNNING);
1117 error = scsi_target_add(starget);
1121 transport_configure_device(&starget->dev);
1123 device_enable_async_suspend(&sdev->sdev_gendev);
1124 scsi_autopm_get_target(starget);
1125 pm_runtime_set_active(&sdev->sdev_gendev);
1126 pm_runtime_forbid(&sdev->sdev_gendev);
1127 pm_runtime_enable(&sdev->sdev_gendev);
1128 scsi_autopm_put_target(starget);
1130 scsi_autopm_get_device(sdev);
1132 error = device_add(&sdev->sdev_gendev);
1134 sdev_printk(KERN_INFO, sdev,
1135 "failed to add device: %d\n", error);
1139 error = scsi_dh_add_device(sdev);
1142 * device_handler is optional, so any error can be ignored
1144 sdev_printk(KERN_INFO, sdev,
1145 "failed to add device handler: %d\n", error);
1147 device_enable_async_suspend(&sdev->sdev_dev);
1148 error = device_add(&sdev->sdev_dev);
1150 sdev_printk(KERN_INFO, sdev,
1151 "failed to add class device: %d\n", error);
1152 scsi_dh_remove_device(sdev);
1153 device_del(&sdev->sdev_gendev);
1156 transport_add_device(&sdev->sdev_gendev);
1157 sdev->is_visible = 1;
1159 error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
1162 /* we're treating error on bsg register as non-fatal,
1163 * so pretend nothing went wrong */
1164 sdev_printk(KERN_INFO, sdev,
1165 "Failed to register bsg queue, errno=%d\n", error);
1167 /* add additional host specific attributes */
1168 if (sdev->host->hostt->sdev_attrs) {
1169 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
1170 error = device_create_file(&sdev->sdev_gendev,
1171 sdev->host->hostt->sdev_attrs[i]);
1177 scsi_autopm_put_device(sdev);
1181 void __scsi_remove_device(struct scsi_device *sdev)
1183 struct device *dev = &sdev->sdev_gendev;
1186 * This cleanup path is not reentrant and while it is impossible
1187 * to get a new reference with scsi_device_get() someone can still
1188 * hold a previously acquired one.
1190 if (sdev->sdev_state == SDEV_DEL)
1193 if (sdev->is_visible) {
1194 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
1197 bsg_unregister_queue(sdev->request_queue);
1198 device_unregister(&sdev->sdev_dev);
1199 transport_remove_device(dev);
1200 scsi_dh_remove_device(sdev);
1203 put_device(&sdev->sdev_dev);
1206 * Stop accepting new requests and wait until all queuecommand() and
1207 * scsi_run_queue() invocations have finished before tearing down the
1210 scsi_device_set_state(sdev, SDEV_DEL);
1211 blk_cleanup_queue(sdev->request_queue);
1212 cancel_work_sync(&sdev->requeue_work);
1214 if (sdev->host->hostt->slave_destroy)
1215 sdev->host->hostt->slave_destroy(sdev);
1216 transport_destroy_device(dev);
1219 * Paired with the kref_get() in scsi_sysfs_initialize(). We have
1220 * remoed sysfs visibility from the device, so make the target
1221 * invisible if this was the last device underneath it.
1223 scsi_target_reap(scsi_target(sdev));
1229 * scsi_remove_device - unregister a device from the scsi bus
1230 * @sdev: scsi_device to unregister
1232 void scsi_remove_device(struct scsi_device *sdev)
1234 struct Scsi_Host *shost = sdev->host;
1236 mutex_lock(&shost->scan_mutex);
1237 __scsi_remove_device(sdev);
1238 mutex_unlock(&shost->scan_mutex);
1240 EXPORT_SYMBOL(scsi_remove_device);
1242 static void __scsi_remove_target(struct scsi_target *starget)
1244 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1245 unsigned long flags;
1246 struct scsi_device *sdev;
1248 spin_lock_irqsave(shost->host_lock, flags);
1250 list_for_each_entry(sdev, &shost->__devices, siblings) {
1251 if (sdev->channel != starget->channel ||
1252 sdev->id != starget->id ||
1253 scsi_device_get(sdev))
1255 spin_unlock_irqrestore(shost->host_lock, flags);
1256 scsi_remove_device(sdev);
1257 scsi_device_put(sdev);
1258 spin_lock_irqsave(shost->host_lock, flags);
1261 spin_unlock_irqrestore(shost->host_lock, flags);
1265 * scsi_remove_target - try to remove a target and all its devices
1266 * @dev: generic starget or parent of generic stargets to be removed
1268 * Note: This is slightly racy. It is possible that if the user
1269 * requests the addition of another device then the target won't be
1272 void scsi_remove_target(struct device *dev)
1274 struct Scsi_Host *shost = dev_to_shost(dev->parent);
1275 struct scsi_target *starget, *last_target = NULL;
1276 unsigned long flags;
1279 spin_lock_irqsave(shost->host_lock, flags);
1280 list_for_each_entry(starget, &shost->__targets, siblings) {
1281 if (starget->state == STARGET_DEL ||
1282 starget == last_target)
1284 if (starget->dev.parent == dev || &starget->dev == dev) {
1285 kref_get(&starget->reap_ref);
1286 last_target = starget;
1287 spin_unlock_irqrestore(shost->host_lock, flags);
1288 __scsi_remove_target(starget);
1289 scsi_target_reap(starget);
1293 spin_unlock_irqrestore(shost->host_lock, flags);
1295 EXPORT_SYMBOL(scsi_remove_target);
1297 int scsi_register_driver(struct device_driver *drv)
1299 drv->bus = &scsi_bus_type;
1301 return driver_register(drv);
1303 EXPORT_SYMBOL(scsi_register_driver);
1305 int scsi_register_interface(struct class_interface *intf)
1307 intf->class = &sdev_class;
1309 return class_interface_register(intf);
1311 EXPORT_SYMBOL(scsi_register_interface);
1314 * scsi_sysfs_add_host - add scsi host to subsystem
1315 * @shost: scsi host struct to add to subsystem
1317 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1321 /* add host specific attributes */
1322 if (shost->hostt->shost_attrs) {
1323 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1324 error = device_create_file(&shost->shost_dev,
1325 shost->hostt->shost_attrs[i]);
1331 transport_register_device(&shost->shost_gendev);
1332 transport_configure_device(&shost->shost_gendev);
1336 static struct device_type scsi_dev_type = {
1337 .name = "scsi_device",
1338 .release = scsi_device_dev_release,
1339 .groups = scsi_sdev_attr_groups,
1342 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1344 unsigned long flags;
1345 struct Scsi_Host *shost = sdev->host;
1346 struct scsi_target *starget = sdev->sdev_target;
1348 device_initialize(&sdev->sdev_gendev);
1349 sdev->sdev_gendev.bus = &scsi_bus_type;
1350 sdev->sdev_gendev.type = &scsi_dev_type;
1351 dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%llu",
1352 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1354 device_initialize(&sdev->sdev_dev);
1355 sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1356 sdev->sdev_dev.class = &sdev_class;
1357 dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%llu",
1358 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1360 * Get a default scsi_level from the target (derived from sibling
1361 * devices). This is the best we can do for guessing how to set
1362 * sdev->lun_in_cdb for the initial INQUIRY command. For LUN 0 the
1363 * setting doesn't matter, because all the bits are zero anyway.
1364 * But it does matter for higher LUNs.
1366 sdev->scsi_level = starget->scsi_level;
1367 if (sdev->scsi_level <= SCSI_2 &&
1368 sdev->scsi_level != SCSI_UNKNOWN &&
1369 !shost->no_scsi2_lun_in_cdb)
1370 sdev->lun_in_cdb = 1;
1372 transport_setup_device(&sdev->sdev_gendev);
1373 spin_lock_irqsave(shost->host_lock, flags);
1374 list_add_tail(&sdev->same_target_siblings, &starget->devices);
1375 list_add_tail(&sdev->siblings, &shost->__devices);
1376 spin_unlock_irqrestore(shost->host_lock, flags);
1378 * device can now only be removed via __scsi_remove_device() so hold
1379 * the target. Target will be held in CREATED state until something
1380 * beneath it becomes visible (in which case it moves to RUNNING)
1382 kref_get(&starget->reap_ref);
1385 int scsi_is_sdev_device(const struct device *dev)
1387 return dev->type == &scsi_dev_type;
1389 EXPORT_SYMBOL(scsi_is_sdev_device);
1391 /* A blank transport template that is used in drivers that don't
1392 * yet implement Transport Attributes */
1393 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };