Loading...
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_BLOCK, "blocked" },
39 { SDEV_CREATED_BLOCK, "created-blocked" },
40};
41
42const char *scsi_device_state_name(enum scsi_device_state state)
43{
44 int i;
45 char *name = NULL;
46
47 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
48 if (sdev_states[i].value == state) {
49 name = sdev_states[i].name;
50 break;
51 }
52 }
53 return name;
54}
55
56static const struct {
57 enum scsi_host_state value;
58 char *name;
59} shost_states[] = {
60 { SHOST_CREATED, "created" },
61 { SHOST_RUNNING, "running" },
62 { SHOST_CANCEL, "cancel" },
63 { SHOST_DEL, "deleted" },
64 { SHOST_RECOVERY, "recovery" },
65 { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
66 { SHOST_DEL_RECOVERY, "deleted/recovery", },
67};
68const char *scsi_host_state_name(enum scsi_host_state state)
69{
70 int i;
71 char *name = NULL;
72
73 for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
74 if (shost_states[i].value == state) {
75 name = shost_states[i].name;
76 break;
77 }
78 }
79 return name;
80}
81
82static int check_set(unsigned int *val, char *src)
83{
84 char *last;
85
86 if (strncmp(src, "-", 20) == 0) {
87 *val = SCAN_WILD_CARD;
88 } else {
89 /*
90 * Doesn't check for int overflow
91 */
92 *val = simple_strtoul(src, &last, 0);
93 if (*last != '\0')
94 return 1;
95 }
96 return 0;
97}
98
99static int scsi_scan(struct Scsi_Host *shost, const char *str)
100{
101 char s1[15], s2[15], s3[15], junk;
102 unsigned int channel, id, lun;
103 int res;
104
105 res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk);
106 if (res != 3)
107 return -EINVAL;
108 if (check_set(&channel, s1))
109 return -EINVAL;
110 if (check_set(&id, s2))
111 return -EINVAL;
112 if (check_set(&lun, s3))
113 return -EINVAL;
114 if (shost->transportt->user_scan)
115 res = shost->transportt->user_scan(shost, channel, id, lun);
116 else
117 res = scsi_scan_host_selected(shost, channel, id, lun, 1);
118 return res;
119}
120
121/*
122 * shost_show_function: macro to create an attr function that can be used to
123 * show a non-bit field.
124 */
125#define shost_show_function(name, field, format_string) \
126static ssize_t \
127show_##name (struct device *dev, struct device_attribute *attr, \
128 char *buf) \
129{ \
130 struct Scsi_Host *shost = class_to_shost(dev); \
131 return snprintf (buf, 20, format_string, shost->field); \
132}
133
134/*
135 * shost_rd_attr: macro to create a function and attribute variable for a
136 * read only field.
137 */
138#define shost_rd_attr2(name, field, format_string) \
139 shost_show_function(name, field, format_string) \
140static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
141
142#define shost_rd_attr(field, format_string) \
143shost_rd_attr2(field, field, format_string)
144
145/*
146 * Create the actual show/store functions and data structures.
147 */
148
149static ssize_t
150store_scan(struct device *dev, struct device_attribute *attr,
151 const char *buf, size_t count)
152{
153 struct Scsi_Host *shost = class_to_shost(dev);
154 int res;
155
156 res = scsi_scan(shost, buf);
157 if (res == 0)
158 res = count;
159 return res;
160};
161static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
162
163static ssize_t
164store_shost_state(struct device *dev, struct device_attribute *attr,
165 const char *buf, size_t count)
166{
167 int i;
168 struct Scsi_Host *shost = class_to_shost(dev);
169 enum scsi_host_state state = 0;
170
171 for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
172 const int len = strlen(shost_states[i].name);
173 if (strncmp(shost_states[i].name, buf, len) == 0 &&
174 buf[len] == '\n') {
175 state = shost_states[i].value;
176 break;
177 }
178 }
179 if (!state)
180 return -EINVAL;
181
182 if (scsi_host_set_state(shost, state))
183 return -EINVAL;
184 return count;
185}
186
187static ssize_t
188show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
189{
190 struct Scsi_Host *shost = class_to_shost(dev);
191 const char *name = scsi_host_state_name(shost->shost_state);
192
193 if (!name)
194 return -EINVAL;
195
196 return snprintf(buf, 20, "%s\n", name);
197}
198
199/* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
200struct device_attribute dev_attr_hstate =
201 __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
202
203static ssize_t
204show_shost_mode(unsigned int mode, char *buf)
205{
206 ssize_t len = 0;
207
208 if (mode & MODE_INITIATOR)
209 len = sprintf(buf, "%s", "Initiator");
210
211 if (mode & MODE_TARGET)
212 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
213
214 len += sprintf(buf + len, "\n");
215
216 return len;
217}
218
219static ssize_t
220show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
221 char *buf)
222{
223 struct Scsi_Host *shost = class_to_shost(dev);
224 unsigned int supported_mode = shost->hostt->supported_mode;
225
226 if (supported_mode == MODE_UNKNOWN)
227 /* by default this should be initiator */
228 supported_mode = MODE_INITIATOR;
229
230 return show_shost_mode(supported_mode, buf);
231}
232
233static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
234
235static ssize_t
236show_shost_active_mode(struct device *dev,
237 struct device_attribute *attr, char *buf)
238{
239 struct Scsi_Host *shost = class_to_shost(dev);
240
241 if (shost->active_mode == MODE_UNKNOWN)
242 return snprintf(buf, 20, "unknown\n");
243 else
244 return show_shost_mode(shost->active_mode, buf);
245}
246
247static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
248
249shost_rd_attr(unique_id, "%u\n");
250shost_rd_attr(host_busy, "%hu\n");
251shost_rd_attr(cmd_per_lun, "%hd\n");
252shost_rd_attr(can_queue, "%hd\n");
253shost_rd_attr(sg_tablesize, "%hu\n");
254shost_rd_attr(sg_prot_tablesize, "%hu\n");
255shost_rd_attr(unchecked_isa_dma, "%d\n");
256shost_rd_attr(prot_capabilities, "%u\n");
257shost_rd_attr(prot_guard_type, "%hd\n");
258shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
259
260static struct attribute *scsi_sysfs_shost_attrs[] = {
261 &dev_attr_unique_id.attr,
262 &dev_attr_host_busy.attr,
263 &dev_attr_cmd_per_lun.attr,
264 &dev_attr_can_queue.attr,
265 &dev_attr_sg_tablesize.attr,
266 &dev_attr_sg_prot_tablesize.attr,
267 &dev_attr_unchecked_isa_dma.attr,
268 &dev_attr_proc_name.attr,
269 &dev_attr_scan.attr,
270 &dev_attr_hstate.attr,
271 &dev_attr_supported_mode.attr,
272 &dev_attr_active_mode.attr,
273 &dev_attr_prot_capabilities.attr,
274 &dev_attr_prot_guard_type.attr,
275 NULL
276};
277
278struct attribute_group scsi_shost_attr_group = {
279 .attrs = scsi_sysfs_shost_attrs,
280};
281
282const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
283 &scsi_shost_attr_group,
284 NULL
285};
286
287static void scsi_device_cls_release(struct device *class_dev)
288{
289 struct scsi_device *sdev;
290
291 sdev = class_to_sdev(class_dev);
292 put_device(&sdev->sdev_gendev);
293}
294
295static void scsi_device_dev_release_usercontext(struct work_struct *work)
296{
297 struct scsi_device *sdev;
298 struct device *parent;
299 struct scsi_target *starget;
300 struct list_head *this, *tmp;
301 unsigned long flags;
302
303 sdev = container_of(work, struct scsi_device, ew.work);
304
305 parent = sdev->sdev_gendev.parent;
306 starget = to_scsi_target(parent);
307
308 spin_lock_irqsave(sdev->host->host_lock, flags);
309 starget->reap_ref++;
310 list_del(&sdev->siblings);
311 list_del(&sdev->same_target_siblings);
312 list_del(&sdev->starved_entry);
313 spin_unlock_irqrestore(sdev->host->host_lock, flags);
314
315 cancel_work_sync(&sdev->event_work);
316
317 list_for_each_safe(this, tmp, &sdev->event_list) {
318 struct scsi_event *evt;
319
320 evt = list_entry(this, struct scsi_event, node);
321 list_del(&evt->node);
322 kfree(evt);
323 }
324
325 blk_put_queue(sdev->request_queue);
326 /* NULL queue means the device can't be used */
327 sdev->request_queue = NULL;
328
329 scsi_target_reap(scsi_target(sdev));
330
331 kfree(sdev->inquiry);
332 kfree(sdev);
333
334 if (parent)
335 put_device(parent);
336}
337
338static void scsi_device_dev_release(struct device *dev)
339{
340 struct scsi_device *sdp = to_scsi_device(dev);
341 execute_in_process_context(scsi_device_dev_release_usercontext,
342 &sdp->ew);
343}
344
345static struct class sdev_class = {
346 .name = "scsi_device",
347 .dev_release = scsi_device_cls_release,
348};
349
350/* all probing is done in the individual ->probe routines */
351static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
352{
353 struct scsi_device *sdp;
354
355 if (dev->type != &scsi_dev_type)
356 return 0;
357
358 sdp = to_scsi_device(dev);
359 if (sdp->no_uld_attach)
360 return 0;
361 return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
362}
363
364static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
365{
366 struct scsi_device *sdev;
367
368 if (dev->type != &scsi_dev_type)
369 return 0;
370
371 sdev = to_scsi_device(dev);
372
373 add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
374 return 0;
375}
376
377struct bus_type scsi_bus_type = {
378 .name = "scsi",
379 .match = scsi_bus_match,
380 .uevent = scsi_bus_uevent,
381#ifdef CONFIG_PM
382 .pm = &scsi_bus_pm_ops,
383#endif
384};
385EXPORT_SYMBOL_GPL(scsi_bus_type);
386
387int scsi_sysfs_register(void)
388{
389 int error;
390
391 error = bus_register(&scsi_bus_type);
392 if (!error) {
393 error = class_register(&sdev_class);
394 if (error)
395 bus_unregister(&scsi_bus_type);
396 }
397
398 return error;
399}
400
401void scsi_sysfs_unregister(void)
402{
403 class_unregister(&sdev_class);
404 bus_unregister(&scsi_bus_type);
405}
406
407/*
408 * sdev_show_function: macro to create an attr function that can be used to
409 * show a non-bit field.
410 */
411#define sdev_show_function(field, format_string) \
412static ssize_t \
413sdev_show_##field (struct device *dev, struct device_attribute *attr, \
414 char *buf) \
415{ \
416 struct scsi_device *sdev; \
417 sdev = to_scsi_device(dev); \
418 return snprintf (buf, 20, format_string, sdev->field); \
419} \
420
421/*
422 * sdev_rd_attr: macro to create a function and attribute variable for a
423 * read only field.
424 */
425#define sdev_rd_attr(field, format_string) \
426 sdev_show_function(field, format_string) \
427static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
428
429
430/*
431 * sdev_rw_attr: create a function and attribute variable for a
432 * read/write field.
433 */
434#define sdev_rw_attr(field, format_string) \
435 sdev_show_function(field, format_string) \
436 \
437static ssize_t \
438sdev_store_##field (struct device *dev, struct device_attribute *attr, \
439 const char *buf, size_t count) \
440{ \
441 struct scsi_device *sdev; \
442 sdev = to_scsi_device(dev); \
443 sscanf (buf, format_string, &sdev->field); \
444 return count; \
445} \
446static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
447
448/* Currently we don't export bit fields, but we might in future,
449 * so leave this code in */
450#if 0
451/*
452 * sdev_rd_attr: create a function and attribute variable for a
453 * read/write bit field.
454 */
455#define sdev_rw_attr_bit(field) \
456 sdev_show_function(field, "%d\n") \
457 \
458static ssize_t \
459sdev_store_##field (struct device *dev, struct device_attribute *attr, \
460 const char *buf, size_t count) \
461{ \
462 int ret; \
463 struct scsi_device *sdev; \
464 ret = scsi_sdev_check_buf_bit(buf); \
465 if (ret >= 0) { \
466 sdev = to_scsi_device(dev); \
467 sdev->field = ret; \
468 ret = count; \
469 } \
470 return ret; \
471} \
472static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
473
474/*
475 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
476 * else return -EINVAL.
477 */
478static int scsi_sdev_check_buf_bit(const char *buf)
479{
480 if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
481 if (buf[0] == '1')
482 return 1;
483 else if (buf[0] == '0')
484 return 0;
485 else
486 return -EINVAL;
487 } else
488 return -EINVAL;
489}
490#endif
491/*
492 * Create the actual show/store functions and data structures.
493 */
494sdev_rd_attr (device_blocked, "%d\n");
495sdev_rd_attr (queue_depth, "%d\n");
496sdev_rd_attr (type, "%d\n");
497sdev_rd_attr (scsi_level, "%d\n");
498sdev_rd_attr (vendor, "%.8s\n");
499sdev_rd_attr (model, "%.16s\n");
500sdev_rd_attr (rev, "%.4s\n");
501
502/*
503 * TODO: can we make these symlinks to the block layer ones?
504 */
505static ssize_t
506sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
507{
508 struct scsi_device *sdev;
509 sdev = to_scsi_device(dev);
510 return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
511}
512
513static ssize_t
514sdev_store_timeout (struct device *dev, struct device_attribute *attr,
515 const char *buf, size_t count)
516{
517 struct scsi_device *sdev;
518 int timeout;
519 sdev = to_scsi_device(dev);
520 sscanf (buf, "%d\n", &timeout);
521 blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
522 return count;
523}
524static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
525
526static ssize_t
527store_rescan_field (struct device *dev, struct device_attribute *attr,
528 const char *buf, size_t count)
529{
530 scsi_rescan_device(dev);
531 return count;
532}
533static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
534
535static void sdev_store_delete_callback(struct device *dev)
536{
537 scsi_remove_device(to_scsi_device(dev));
538}
539
540static ssize_t
541sdev_store_delete(struct device *dev, struct device_attribute *attr,
542 const char *buf, size_t count)
543{
544 int rc;
545
546 /* An attribute cannot be unregistered by one of its own methods,
547 * so we have to use this roundabout approach.
548 */
549 rc = device_schedule_callback(dev, sdev_store_delete_callback);
550 if (rc)
551 count = rc;
552 return count;
553};
554static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
555
556static ssize_t
557store_state_field(struct device *dev, struct device_attribute *attr,
558 const char *buf, size_t count)
559{
560 int i;
561 struct scsi_device *sdev = to_scsi_device(dev);
562 enum scsi_device_state state = 0;
563
564 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
565 const int len = strlen(sdev_states[i].name);
566 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
567 buf[len] == '\n') {
568 state = sdev_states[i].value;
569 break;
570 }
571 }
572 if (!state)
573 return -EINVAL;
574
575 if (scsi_device_set_state(sdev, state))
576 return -EINVAL;
577 return count;
578}
579
580static ssize_t
581show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
582{
583 struct scsi_device *sdev = to_scsi_device(dev);
584 const char *name = scsi_device_state_name(sdev->sdev_state);
585
586 if (!name)
587 return -EINVAL;
588
589 return snprintf(buf, 20, "%s\n", name);
590}
591
592static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
593
594static ssize_t
595show_queue_type_field(struct device *dev, struct device_attribute *attr,
596 char *buf)
597{
598 struct scsi_device *sdev = to_scsi_device(dev);
599 const char *name = "none";
600
601 if (sdev->ordered_tags)
602 name = "ordered";
603 else if (sdev->simple_tags)
604 name = "simple";
605
606 return snprintf(buf, 20, "%s\n", name);
607}
608
609static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
610
611static ssize_t
612show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf)
613{
614 return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
615}
616
617static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
618
619#define show_sdev_iostat(field) \
620static ssize_t \
621show_iostat_##field(struct device *dev, struct device_attribute *attr, \
622 char *buf) \
623{ \
624 struct scsi_device *sdev = to_scsi_device(dev); \
625 unsigned long long count = atomic_read(&sdev->field); \
626 return snprintf(buf, 20, "0x%llx\n", count); \
627} \
628static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
629
630show_sdev_iostat(iorequest_cnt);
631show_sdev_iostat(iodone_cnt);
632show_sdev_iostat(ioerr_cnt);
633
634static ssize_t
635sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
636{
637 struct scsi_device *sdev;
638 sdev = to_scsi_device(dev);
639 return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
640}
641static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
642
643#define DECLARE_EVT_SHOW(name, Cap_name) \
644static ssize_t \
645sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
646 char *buf) \
647{ \
648 struct scsi_device *sdev = to_scsi_device(dev); \
649 int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
650 return snprintf(buf, 20, "%d\n", val); \
651}
652
653#define DECLARE_EVT_STORE(name, Cap_name) \
654static ssize_t \
655sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
656 const char *buf, size_t count) \
657{ \
658 struct scsi_device *sdev = to_scsi_device(dev); \
659 int val = simple_strtoul(buf, NULL, 0); \
660 if (val == 0) \
661 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
662 else if (val == 1) \
663 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
664 else \
665 return -EINVAL; \
666 return count; \
667}
668
669#define DECLARE_EVT(name, Cap_name) \
670 DECLARE_EVT_SHOW(name, Cap_name) \
671 DECLARE_EVT_STORE(name, Cap_name) \
672 static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name, \
673 sdev_store_evt_##name);
674#define REF_EVT(name) &dev_attr_evt_##name.attr
675
676DECLARE_EVT(media_change, MEDIA_CHANGE)
677
678/* Default template for device attributes. May NOT be modified */
679static struct attribute *scsi_sdev_attrs[] = {
680 &dev_attr_device_blocked.attr,
681 &dev_attr_type.attr,
682 &dev_attr_scsi_level.attr,
683 &dev_attr_vendor.attr,
684 &dev_attr_model.attr,
685 &dev_attr_rev.attr,
686 &dev_attr_rescan.attr,
687 &dev_attr_delete.attr,
688 &dev_attr_state.attr,
689 &dev_attr_timeout.attr,
690 &dev_attr_iocounterbits.attr,
691 &dev_attr_iorequest_cnt.attr,
692 &dev_attr_iodone_cnt.attr,
693 &dev_attr_ioerr_cnt.attr,
694 &dev_attr_modalias.attr,
695 REF_EVT(media_change),
696 NULL
697};
698
699static struct attribute_group scsi_sdev_attr_group = {
700 .attrs = scsi_sdev_attrs,
701};
702
703static const struct attribute_group *scsi_sdev_attr_groups[] = {
704 &scsi_sdev_attr_group,
705 NULL
706};
707
708static ssize_t
709sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
710 const char *buf, size_t count)
711{
712 int depth, retval;
713 struct scsi_device *sdev = to_scsi_device(dev);
714 struct scsi_host_template *sht = sdev->host->hostt;
715
716 if (!sht->change_queue_depth)
717 return -EINVAL;
718
719 depth = simple_strtoul(buf, NULL, 0);
720
721 if (depth < 1)
722 return -EINVAL;
723
724 retval = sht->change_queue_depth(sdev, depth,
725 SCSI_QDEPTH_DEFAULT);
726 if (retval < 0)
727 return retval;
728
729 sdev->max_queue_depth = sdev->queue_depth;
730
731 return count;
732}
733
734static struct device_attribute sdev_attr_queue_depth_rw =
735 __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
736 sdev_store_queue_depth_rw);
737
738static ssize_t
739sdev_show_queue_ramp_up_period(struct device *dev,
740 struct device_attribute *attr,
741 char *buf)
742{
743 struct scsi_device *sdev;
744 sdev = to_scsi_device(dev);
745 return snprintf(buf, 20, "%u\n",
746 jiffies_to_msecs(sdev->queue_ramp_up_period));
747}
748
749static ssize_t
750sdev_store_queue_ramp_up_period(struct device *dev,
751 struct device_attribute *attr,
752 const char *buf, size_t count)
753{
754 struct scsi_device *sdev = to_scsi_device(dev);
755 unsigned long period;
756
757 if (strict_strtoul(buf, 10, &period))
758 return -EINVAL;
759
760 sdev->queue_ramp_up_period = msecs_to_jiffies(period);
761 return period;
762}
763
764static struct device_attribute sdev_attr_queue_ramp_up_period =
765 __ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
766 sdev_show_queue_ramp_up_period,
767 sdev_store_queue_ramp_up_period);
768
769static ssize_t
770sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
771 const char *buf, size_t count)
772{
773 struct scsi_device *sdev = to_scsi_device(dev);
774 struct scsi_host_template *sht = sdev->host->hostt;
775 int tag_type = 0, retval;
776 int prev_tag_type = scsi_get_tag_type(sdev);
777
778 if (!sdev->tagged_supported || !sht->change_queue_type)
779 return -EINVAL;
780
781 if (strncmp(buf, "ordered", 7) == 0)
782 tag_type = MSG_ORDERED_TAG;
783 else if (strncmp(buf, "simple", 6) == 0)
784 tag_type = MSG_SIMPLE_TAG;
785 else if (strncmp(buf, "none", 4) != 0)
786 return -EINVAL;
787
788 if (tag_type == prev_tag_type)
789 return count;
790
791 retval = sht->change_queue_type(sdev, tag_type);
792 if (retval < 0)
793 return retval;
794
795 return count;
796}
797
798static int scsi_target_add(struct scsi_target *starget)
799{
800 int error;
801
802 if (starget->state != STARGET_CREATED)
803 return 0;
804
805 error = device_add(&starget->dev);
806 if (error) {
807 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
808 return error;
809 }
810 transport_add_device(&starget->dev);
811 starget->state = STARGET_RUNNING;
812
813 pm_runtime_set_active(&starget->dev);
814 pm_runtime_enable(&starget->dev);
815 device_enable_async_suspend(&starget->dev);
816
817 return 0;
818}
819
820static struct device_attribute sdev_attr_queue_type_rw =
821 __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
822 sdev_store_queue_type_rw);
823
824/**
825 * scsi_sysfs_add_sdev - add scsi device to sysfs
826 * @sdev: scsi_device to add
827 *
828 * Return value:
829 * 0 on Success / non-zero on Failure
830 **/
831int scsi_sysfs_add_sdev(struct scsi_device *sdev)
832{
833 int error, i;
834 struct request_queue *rq = sdev->request_queue;
835 struct scsi_target *starget = sdev->sdev_target;
836
837 error = scsi_device_set_state(sdev, SDEV_RUNNING);
838 if (error)
839 return error;
840
841 error = scsi_target_add(starget);
842 if (error)
843 return error;
844
845 transport_configure_device(&starget->dev);
846
847 device_enable_async_suspend(&sdev->sdev_gendev);
848 scsi_autopm_get_target(starget);
849 pm_runtime_set_active(&sdev->sdev_gendev);
850 pm_runtime_forbid(&sdev->sdev_gendev);
851 pm_runtime_enable(&sdev->sdev_gendev);
852 scsi_autopm_put_target(starget);
853
854 /* The following call will keep sdev active indefinitely, until
855 * its driver does a corresponding scsi_autopm_pm_device(). Only
856 * drivers supporting autosuspend will do this.
857 */
858 scsi_autopm_get_device(sdev);
859
860 error = device_add(&sdev->sdev_gendev);
861 if (error) {
862 sdev_printk(KERN_INFO, sdev,
863 "failed to add device: %d\n", error);
864 return error;
865 }
866 device_enable_async_suspend(&sdev->sdev_dev);
867 error = device_add(&sdev->sdev_dev);
868 if (error) {
869 sdev_printk(KERN_INFO, sdev,
870 "failed to add class device: %d\n", error);
871 device_del(&sdev->sdev_gendev);
872 return error;
873 }
874 transport_add_device(&sdev->sdev_gendev);
875 sdev->is_visible = 1;
876
877 /* create queue files, which may be writable, depending on the host */
878 if (sdev->host->hostt->change_queue_depth) {
879 error = device_create_file(&sdev->sdev_gendev,
880 &sdev_attr_queue_depth_rw);
881 error = device_create_file(&sdev->sdev_gendev,
882 &sdev_attr_queue_ramp_up_period);
883 }
884 else
885 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
886 if (error)
887 return error;
888
889 if (sdev->host->hostt->change_queue_type)
890 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
891 else
892 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
893 if (error)
894 return error;
895
896 error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
897
898 if (error)
899 /* we're treating error on bsg register as non-fatal,
900 * so pretend nothing went wrong */
901 sdev_printk(KERN_INFO, sdev,
902 "Failed to register bsg queue, errno=%d\n", error);
903
904 /* add additional host specific attributes */
905 if (sdev->host->hostt->sdev_attrs) {
906 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
907 error = device_create_file(&sdev->sdev_gendev,
908 sdev->host->hostt->sdev_attrs[i]);
909 if (error)
910 return error;
911 }
912 }
913
914 return error;
915}
916
917void __scsi_remove_device(struct scsi_device *sdev)
918{
919 struct device *dev = &sdev->sdev_gendev;
920
921 if (sdev->is_visible) {
922 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
923 return;
924
925 bsg_unregister_queue(sdev->request_queue);
926 device_unregister(&sdev->sdev_dev);
927 transport_remove_device(dev);
928 device_del(dev);
929 } else
930 put_device(&sdev->sdev_dev);
931 scsi_device_set_state(sdev, SDEV_DEL);
932 if (sdev->host->hostt->slave_destroy)
933 sdev->host->hostt->slave_destroy(sdev);
934 transport_destroy_device(dev);
935
936 /* cause the request function to reject all I/O requests */
937 sdev->request_queue->queuedata = NULL;
938
939 /* Freeing the queue signals to block that we're done */
940 scsi_free_queue(sdev->request_queue);
941 put_device(dev);
942}
943
944/**
945 * scsi_remove_device - unregister a device from the scsi bus
946 * @sdev: scsi_device to unregister
947 **/
948void scsi_remove_device(struct scsi_device *sdev)
949{
950 struct Scsi_Host *shost = sdev->host;
951
952 mutex_lock(&shost->scan_mutex);
953 __scsi_remove_device(sdev);
954 mutex_unlock(&shost->scan_mutex);
955}
956EXPORT_SYMBOL(scsi_remove_device);
957
958static void __scsi_remove_target(struct scsi_target *starget)
959{
960 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
961 unsigned long flags;
962 struct scsi_device *sdev;
963
964 spin_lock_irqsave(shost->host_lock, flags);
965 starget->reap_ref++;
966 restart:
967 list_for_each_entry(sdev, &shost->__devices, siblings) {
968 if (sdev->channel != starget->channel ||
969 sdev->id != starget->id ||
970 scsi_device_get(sdev))
971 continue;
972 spin_unlock_irqrestore(shost->host_lock, flags);
973 scsi_remove_device(sdev);
974 scsi_device_put(sdev);
975 spin_lock_irqsave(shost->host_lock, flags);
976 goto restart;
977 }
978 spin_unlock_irqrestore(shost->host_lock, flags);
979 scsi_target_reap(starget);
980}
981
982static int __remove_child (struct device * dev, void * data)
983{
984 if (scsi_is_target_device(dev))
985 __scsi_remove_target(to_scsi_target(dev));
986 return 0;
987}
988
989/**
990 * scsi_remove_target - try to remove a target and all its devices
991 * @dev: generic starget or parent of generic stargets to be removed
992 *
993 * Note: This is slightly racy. It is possible that if the user
994 * requests the addition of another device then the target won't be
995 * removed.
996 */
997void scsi_remove_target(struct device *dev)
998{
999 if (scsi_is_target_device(dev)) {
1000 __scsi_remove_target(to_scsi_target(dev));
1001 return;
1002 }
1003
1004 get_device(dev);
1005 device_for_each_child(dev, NULL, __remove_child);
1006 put_device(dev);
1007}
1008EXPORT_SYMBOL(scsi_remove_target);
1009
1010int scsi_register_driver(struct device_driver *drv)
1011{
1012 drv->bus = &scsi_bus_type;
1013
1014 return driver_register(drv);
1015}
1016EXPORT_SYMBOL(scsi_register_driver);
1017
1018int scsi_register_interface(struct class_interface *intf)
1019{
1020 intf->class = &sdev_class;
1021
1022 return class_interface_register(intf);
1023}
1024EXPORT_SYMBOL(scsi_register_interface);
1025
1026/**
1027 * scsi_sysfs_add_host - add scsi host to subsystem
1028 * @shost: scsi host struct to add to subsystem
1029 **/
1030int scsi_sysfs_add_host(struct Scsi_Host *shost)
1031{
1032 int error, i;
1033
1034 /* add host specific attributes */
1035 if (shost->hostt->shost_attrs) {
1036 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1037 error = device_create_file(&shost->shost_dev,
1038 shost->hostt->shost_attrs[i]);
1039 if (error)
1040 return error;
1041 }
1042 }
1043
1044 transport_register_device(&shost->shost_gendev);
1045 transport_configure_device(&shost->shost_gendev);
1046 return 0;
1047}
1048
1049static struct device_type scsi_dev_type = {
1050 .name = "scsi_device",
1051 .release = scsi_device_dev_release,
1052 .groups = scsi_sdev_attr_groups,
1053};
1054
1055void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1056{
1057 unsigned long flags;
1058 struct Scsi_Host *shost = sdev->host;
1059 struct scsi_target *starget = sdev->sdev_target;
1060
1061 device_initialize(&sdev->sdev_gendev);
1062 sdev->sdev_gendev.bus = &scsi_bus_type;
1063 sdev->sdev_gendev.type = &scsi_dev_type;
1064 dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%d",
1065 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1066
1067 device_initialize(&sdev->sdev_dev);
1068 sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1069 sdev->sdev_dev.class = &sdev_class;
1070 dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%d",
1071 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1072 sdev->scsi_level = starget->scsi_level;
1073 transport_setup_device(&sdev->sdev_gendev);
1074 spin_lock_irqsave(shost->host_lock, flags);
1075 list_add_tail(&sdev->same_target_siblings, &starget->devices);
1076 list_add_tail(&sdev->siblings, &shost->__devices);
1077 spin_unlock_irqrestore(shost->host_lock, flags);
1078}
1079
1080int scsi_is_sdev_device(const struct device *dev)
1081{
1082 return dev->type == &scsi_dev_type;
1083}
1084EXPORT_SYMBOL(scsi_is_sdev_device);
1085
1086/* A blank transport template that is used in drivers that don't
1087 * yet implement Transport Attributes */
1088struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };
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(const char *str)
251{
252 if (sysfs_streq(str, "adapter"))
253 return SCSI_ADAPTER_RESET;
254 else if (sysfs_streq(str, "firmware"))
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 int type;
268
269 type = check_reset_type(buf);
270 if (!type)
271 goto exit_store_host_reset;
272
273 if (sht->host_reset)
274 ret = sht->host_reset(shost, type);
275
276exit_store_host_reset:
277 if (ret == 0)
278 ret = count;
279 return ret;
280}
281
282static DEVICE_ATTR(host_reset, S_IWUSR, NULL, store_host_reset);
283
284static ssize_t
285show_shost_eh_deadline(struct device *dev,
286 struct device_attribute *attr, char *buf)
287{
288 struct Scsi_Host *shost = class_to_shost(dev);
289
290 if (shost->eh_deadline == -1)
291 return snprintf(buf, strlen("off") + 2, "off\n");
292 return sprintf(buf, "%u\n", shost->eh_deadline / HZ);
293}
294
295static ssize_t
296store_shost_eh_deadline(struct device *dev, struct device_attribute *attr,
297 const char *buf, size_t count)
298{
299 struct Scsi_Host *shost = class_to_shost(dev);
300 int ret = -EINVAL;
301 unsigned long deadline, flags;
302
303 if (shost->transportt &&
304 (shost->transportt->eh_strategy_handler ||
305 !shost->hostt->eh_host_reset_handler))
306 return ret;
307
308 if (!strncmp(buf, "off", strlen("off")))
309 deadline = -1;
310 else {
311 ret = kstrtoul(buf, 10, &deadline);
312 if (ret)
313 return ret;
314 if (deadline * HZ > UINT_MAX)
315 return -EINVAL;
316 }
317
318 spin_lock_irqsave(shost->host_lock, flags);
319 if (scsi_host_in_recovery(shost))
320 ret = -EBUSY;
321 else {
322 if (deadline == -1)
323 shost->eh_deadline = -1;
324 else
325 shost->eh_deadline = deadline * HZ;
326
327 ret = count;
328 }
329 spin_unlock_irqrestore(shost->host_lock, flags);
330
331 return ret;
332}
333
334static DEVICE_ATTR(eh_deadline, S_IRUGO | S_IWUSR, show_shost_eh_deadline, store_shost_eh_deadline);
335
336shost_rd_attr(unique_id, "%u\n");
337shost_rd_attr(host_busy, "%hu\n");
338shost_rd_attr(cmd_per_lun, "%hd\n");
339shost_rd_attr(can_queue, "%hd\n");
340shost_rd_attr(sg_tablesize, "%hu\n");
341shost_rd_attr(sg_prot_tablesize, "%hu\n");
342shost_rd_attr(unchecked_isa_dma, "%d\n");
343shost_rd_attr(prot_capabilities, "%u\n");
344shost_rd_attr(prot_guard_type, "%hd\n");
345shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
346
347static struct attribute *scsi_sysfs_shost_attrs[] = {
348 &dev_attr_unique_id.attr,
349 &dev_attr_host_busy.attr,
350 &dev_attr_cmd_per_lun.attr,
351 &dev_attr_can_queue.attr,
352 &dev_attr_sg_tablesize.attr,
353 &dev_attr_sg_prot_tablesize.attr,
354 &dev_attr_unchecked_isa_dma.attr,
355 &dev_attr_proc_name.attr,
356 &dev_attr_scan.attr,
357 &dev_attr_hstate.attr,
358 &dev_attr_supported_mode.attr,
359 &dev_attr_active_mode.attr,
360 &dev_attr_prot_capabilities.attr,
361 &dev_attr_prot_guard_type.attr,
362 &dev_attr_host_reset.attr,
363 &dev_attr_eh_deadline.attr,
364 NULL
365};
366
367struct attribute_group scsi_shost_attr_group = {
368 .attrs = scsi_sysfs_shost_attrs,
369};
370
371const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
372 &scsi_shost_attr_group,
373 NULL
374};
375
376static void scsi_device_cls_release(struct device *class_dev)
377{
378 struct scsi_device *sdev;
379
380 sdev = class_to_sdev(class_dev);
381 put_device(&sdev->sdev_gendev);
382}
383
384static void scsi_device_dev_release_usercontext(struct work_struct *work)
385{
386 struct scsi_device *sdev;
387 struct device *parent;
388 struct list_head *this, *tmp;
389 unsigned long flags;
390
391 sdev = container_of(work, struct scsi_device, ew.work);
392
393 parent = sdev->sdev_gendev.parent;
394
395 spin_lock_irqsave(sdev->host->host_lock, flags);
396 list_del(&sdev->siblings);
397 list_del(&sdev->same_target_siblings);
398 list_del(&sdev->starved_entry);
399 spin_unlock_irqrestore(sdev->host->host_lock, flags);
400
401 cancel_work_sync(&sdev->event_work);
402
403 list_for_each_safe(this, tmp, &sdev->event_list) {
404 struct scsi_event *evt;
405
406 evt = list_entry(this, struct scsi_event, node);
407 list_del(&evt->node);
408 kfree(evt);
409 }
410
411 blk_put_queue(sdev->request_queue);
412 /* NULL queue means the device can't be used */
413 sdev->request_queue = NULL;
414
415 kfree(sdev->vpd_pg83);
416 kfree(sdev->vpd_pg80);
417 kfree(sdev->inquiry);
418 kfree(sdev);
419
420 if (parent)
421 put_device(parent);
422}
423
424static void scsi_device_dev_release(struct device *dev)
425{
426 struct scsi_device *sdp = to_scsi_device(dev);
427 execute_in_process_context(scsi_device_dev_release_usercontext,
428 &sdp->ew);
429}
430
431static struct class sdev_class = {
432 .name = "scsi_device",
433 .dev_release = scsi_device_cls_release,
434};
435
436/* all probing is done in the individual ->probe routines */
437static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
438{
439 struct scsi_device *sdp;
440
441 if (dev->type != &scsi_dev_type)
442 return 0;
443
444 sdp = to_scsi_device(dev);
445 if (sdp->no_uld_attach)
446 return 0;
447 return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
448}
449
450static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
451{
452 struct scsi_device *sdev;
453
454 if (dev->type != &scsi_dev_type)
455 return 0;
456
457 sdev = to_scsi_device(dev);
458
459 add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
460 return 0;
461}
462
463struct bus_type scsi_bus_type = {
464 .name = "scsi",
465 .match = scsi_bus_match,
466 .uevent = scsi_bus_uevent,
467#ifdef CONFIG_PM
468 .pm = &scsi_bus_pm_ops,
469#endif
470};
471EXPORT_SYMBOL_GPL(scsi_bus_type);
472
473int scsi_sysfs_register(void)
474{
475 int error;
476
477 error = bus_register(&scsi_bus_type);
478 if (!error) {
479 error = class_register(&sdev_class);
480 if (error)
481 bus_unregister(&scsi_bus_type);
482 }
483
484 return error;
485}
486
487void scsi_sysfs_unregister(void)
488{
489 class_unregister(&sdev_class);
490 bus_unregister(&scsi_bus_type);
491}
492
493/*
494 * sdev_show_function: macro to create an attr function that can be used to
495 * show a non-bit field.
496 */
497#define sdev_show_function(field, format_string) \
498static ssize_t \
499sdev_show_##field (struct device *dev, struct device_attribute *attr, \
500 char *buf) \
501{ \
502 struct scsi_device *sdev; \
503 sdev = to_scsi_device(dev); \
504 return snprintf (buf, 20, format_string, sdev->field); \
505} \
506
507/*
508 * sdev_rd_attr: macro to create a function and attribute variable for a
509 * read only field.
510 */
511#define sdev_rd_attr(field, format_string) \
512 sdev_show_function(field, format_string) \
513static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
514
515
516/*
517 * sdev_rw_attr: create a function and attribute variable for a
518 * read/write field.
519 */
520#define sdev_rw_attr(field, format_string) \
521 sdev_show_function(field, format_string) \
522 \
523static ssize_t \
524sdev_store_##field (struct device *dev, struct device_attribute *attr, \
525 const char *buf, size_t count) \
526{ \
527 struct scsi_device *sdev; \
528 sdev = to_scsi_device(dev); \
529 sscanf (buf, format_string, &sdev->field); \
530 return count; \
531} \
532static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
533
534/* Currently we don't export bit fields, but we might in future,
535 * so leave this code in */
536#if 0
537/*
538 * sdev_rd_attr: create a function and attribute variable for a
539 * read/write bit field.
540 */
541#define sdev_rw_attr_bit(field) \
542 sdev_show_function(field, "%d\n") \
543 \
544static ssize_t \
545sdev_store_##field (struct device *dev, struct device_attribute *attr, \
546 const char *buf, size_t count) \
547{ \
548 int ret; \
549 struct scsi_device *sdev; \
550 ret = scsi_sdev_check_buf_bit(buf); \
551 if (ret >= 0) { \
552 sdev = to_scsi_device(dev); \
553 sdev->field = ret; \
554 ret = count; \
555 } \
556 return ret; \
557} \
558static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
559
560/*
561 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
562 * else return -EINVAL.
563 */
564static int scsi_sdev_check_buf_bit(const char *buf)
565{
566 if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
567 if (buf[0] == '1')
568 return 1;
569 else if (buf[0] == '0')
570 return 0;
571 else
572 return -EINVAL;
573 } else
574 return -EINVAL;
575}
576#endif
577/*
578 * Create the actual show/store functions and data structures.
579 */
580sdev_rd_attr (device_blocked, "%d\n");
581sdev_rd_attr (device_busy, "%d\n");
582sdev_rd_attr (type, "%d\n");
583sdev_rd_attr (scsi_level, "%d\n");
584sdev_rd_attr (vendor, "%.8s\n");
585sdev_rd_attr (model, "%.16s\n");
586sdev_rd_attr (rev, "%.4s\n");
587
588/*
589 * TODO: can we make these symlinks to the block layer ones?
590 */
591static ssize_t
592sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
593{
594 struct scsi_device *sdev;
595 sdev = to_scsi_device(dev);
596 return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
597}
598
599static ssize_t
600sdev_store_timeout (struct device *dev, struct device_attribute *attr,
601 const char *buf, size_t count)
602{
603 struct scsi_device *sdev;
604 int timeout;
605 sdev = to_scsi_device(dev);
606 sscanf (buf, "%d\n", &timeout);
607 blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
608 return count;
609}
610static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
611
612static ssize_t
613sdev_show_eh_timeout(struct device *dev, struct device_attribute *attr, char *buf)
614{
615 struct scsi_device *sdev;
616 sdev = to_scsi_device(dev);
617 return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
618}
619
620static ssize_t
621sdev_store_eh_timeout(struct device *dev, struct device_attribute *attr,
622 const char *buf, size_t count)
623{
624 struct scsi_device *sdev;
625 unsigned int eh_timeout;
626 int err;
627
628 if (!capable(CAP_SYS_ADMIN))
629 return -EACCES;
630
631 sdev = to_scsi_device(dev);
632 err = kstrtouint(buf, 10, &eh_timeout);
633 if (err)
634 return err;
635 sdev->eh_timeout = eh_timeout * HZ;
636
637 return count;
638}
639static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
640
641static ssize_t
642store_rescan_field (struct device *dev, struct device_attribute *attr,
643 const char *buf, size_t count)
644{
645 scsi_rescan_device(dev);
646 return count;
647}
648static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
649
650static ssize_t
651sdev_store_delete(struct device *dev, struct device_attribute *attr,
652 const char *buf, size_t count)
653{
654 if (device_remove_file_self(dev, attr))
655 scsi_remove_device(to_scsi_device(dev));
656 return count;
657};
658static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
659
660static ssize_t
661store_state_field(struct device *dev, struct device_attribute *attr,
662 const char *buf, size_t count)
663{
664 int i;
665 struct scsi_device *sdev = to_scsi_device(dev);
666 enum scsi_device_state state = 0;
667
668 for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
669 const int len = strlen(sdev_states[i].name);
670 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
671 buf[len] == '\n') {
672 state = sdev_states[i].value;
673 break;
674 }
675 }
676 if (!state)
677 return -EINVAL;
678
679 if (scsi_device_set_state(sdev, state))
680 return -EINVAL;
681 return count;
682}
683
684static ssize_t
685show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
686{
687 struct scsi_device *sdev = to_scsi_device(dev);
688 const char *name = scsi_device_state_name(sdev->sdev_state);
689
690 if (!name)
691 return -EINVAL;
692
693 return snprintf(buf, 20, "%s\n", name);
694}
695
696static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
697
698static ssize_t
699show_queue_type_field(struct device *dev, struct device_attribute *attr,
700 char *buf)
701{
702 struct scsi_device *sdev = to_scsi_device(dev);
703 const char *name = "none";
704
705 if (sdev->ordered_tags)
706 name = "ordered";
707 else if (sdev->simple_tags)
708 name = "simple";
709
710 return snprintf(buf, 20, "%s\n", name);
711}
712
713static ssize_t
714store_queue_type_field(struct device *dev, struct device_attribute *attr,
715 const char *buf, size_t count)
716{
717 struct scsi_device *sdev = to_scsi_device(dev);
718 struct scsi_host_template *sht = sdev->host->hostt;
719 int tag_type = 0, retval;
720 int prev_tag_type = scsi_get_tag_type(sdev);
721
722 if (!sdev->tagged_supported || !sht->change_queue_type)
723 return -EINVAL;
724
725 if (strncmp(buf, "ordered", 7) == 0)
726 tag_type = MSG_ORDERED_TAG;
727 else if (strncmp(buf, "simple", 6) == 0)
728 tag_type = MSG_SIMPLE_TAG;
729 else if (strncmp(buf, "none", 4) != 0)
730 return -EINVAL;
731
732 if (tag_type == prev_tag_type)
733 return count;
734
735 retval = sht->change_queue_type(sdev, tag_type);
736 if (retval < 0)
737 return retval;
738
739 return count;
740}
741
742static DEVICE_ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
743 store_queue_type_field);
744
745#define sdev_vpd_pg_attr(_page) \
746static ssize_t \
747show_vpd_##_page(struct file *filp, struct kobject *kobj, \
748 struct bin_attribute *bin_attr, \
749 char *buf, loff_t off, size_t count) \
750{ \
751 struct device *dev = container_of(kobj, struct device, kobj); \
752 struct scsi_device *sdev = to_scsi_device(dev); \
753 if (!sdev->vpd_##_page) \
754 return -EINVAL; \
755 return memory_read_from_buffer(buf, count, &off, \
756 sdev->vpd_##_page, \
757 sdev->vpd_##_page##_len); \
758} \
759static struct bin_attribute dev_attr_vpd_##_page = { \
760 .attr = {.name = __stringify(vpd_##_page), .mode = S_IRUGO }, \
761 .size = 0, \
762 .read = show_vpd_##_page, \
763};
764
765sdev_vpd_pg_attr(pg83);
766sdev_vpd_pg_attr(pg80);
767
768static ssize_t
769show_iostat_counterbits(struct device *dev, struct device_attribute *attr,
770 char *buf)
771{
772 return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
773}
774
775static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
776
777#define show_sdev_iostat(field) \
778static ssize_t \
779show_iostat_##field(struct device *dev, struct device_attribute *attr, \
780 char *buf) \
781{ \
782 struct scsi_device *sdev = to_scsi_device(dev); \
783 unsigned long long count = atomic_read(&sdev->field); \
784 return snprintf(buf, 20, "0x%llx\n", count); \
785} \
786static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
787
788show_sdev_iostat(iorequest_cnt);
789show_sdev_iostat(iodone_cnt);
790show_sdev_iostat(ioerr_cnt);
791
792static ssize_t
793sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
794{
795 struct scsi_device *sdev;
796 sdev = to_scsi_device(dev);
797 return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
798}
799static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
800
801#define DECLARE_EVT_SHOW(name, Cap_name) \
802static ssize_t \
803sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
804 char *buf) \
805{ \
806 struct scsi_device *sdev = to_scsi_device(dev); \
807 int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
808 return snprintf(buf, 20, "%d\n", val); \
809}
810
811#define DECLARE_EVT_STORE(name, Cap_name) \
812static ssize_t \
813sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
814 const char *buf, size_t count) \
815{ \
816 struct scsi_device *sdev = to_scsi_device(dev); \
817 int val = simple_strtoul(buf, NULL, 0); \
818 if (val == 0) \
819 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
820 else if (val == 1) \
821 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
822 else \
823 return -EINVAL; \
824 return count; \
825}
826
827#define DECLARE_EVT(name, Cap_name) \
828 DECLARE_EVT_SHOW(name, Cap_name) \
829 DECLARE_EVT_STORE(name, Cap_name) \
830 static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name, \
831 sdev_store_evt_##name);
832#define REF_EVT(name) &dev_attr_evt_##name.attr
833
834DECLARE_EVT(media_change, MEDIA_CHANGE)
835DECLARE_EVT(inquiry_change_reported, INQUIRY_CHANGE_REPORTED)
836DECLARE_EVT(capacity_change_reported, CAPACITY_CHANGE_REPORTED)
837DECLARE_EVT(soft_threshold_reached, SOFT_THRESHOLD_REACHED_REPORTED)
838DECLARE_EVT(mode_parameter_change_reported, MODE_PARAMETER_CHANGE_REPORTED)
839DECLARE_EVT(lun_change_reported, LUN_CHANGE_REPORTED)
840
841static ssize_t
842sdev_store_queue_depth(struct device *dev, struct device_attribute *attr,
843 const char *buf, size_t count)
844{
845 int depth, retval;
846 struct scsi_device *sdev = to_scsi_device(dev);
847 struct scsi_host_template *sht = sdev->host->hostt;
848
849 if (!sht->change_queue_depth)
850 return -EINVAL;
851
852 depth = simple_strtoul(buf, NULL, 0);
853
854 if (depth < 1)
855 return -EINVAL;
856
857 retval = sht->change_queue_depth(sdev, depth,
858 SCSI_QDEPTH_DEFAULT);
859 if (retval < 0)
860 return retval;
861
862 sdev->max_queue_depth = sdev->queue_depth;
863
864 return count;
865}
866sdev_show_function(queue_depth, "%d\n");
867
868static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
869 sdev_store_queue_depth);
870
871static ssize_t
872sdev_show_queue_ramp_up_period(struct device *dev,
873 struct device_attribute *attr,
874 char *buf)
875{
876 struct scsi_device *sdev;
877 sdev = to_scsi_device(dev);
878 return snprintf(buf, 20, "%u\n",
879 jiffies_to_msecs(sdev->queue_ramp_up_period));
880}
881
882static ssize_t
883sdev_store_queue_ramp_up_period(struct device *dev,
884 struct device_attribute *attr,
885 const char *buf, size_t count)
886{
887 struct scsi_device *sdev = to_scsi_device(dev);
888 unsigned long period;
889
890 if (strict_strtoul(buf, 10, &period))
891 return -EINVAL;
892
893 sdev->queue_ramp_up_period = msecs_to_jiffies(period);
894 return period;
895}
896
897static DEVICE_ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
898 sdev_show_queue_ramp_up_period,
899 sdev_store_queue_ramp_up_period);
900
901static umode_t scsi_sdev_attr_is_visible(struct kobject *kobj,
902 struct attribute *attr, int i)
903{
904 struct device *dev = container_of(kobj, struct device, kobj);
905 struct scsi_device *sdev = to_scsi_device(dev);
906
907
908 if (attr == &dev_attr_queue_depth.attr &&
909 !sdev->host->hostt->change_queue_depth)
910 return S_IRUGO;
911
912 if (attr == &dev_attr_queue_ramp_up_period.attr &&
913 !sdev->host->hostt->change_queue_depth)
914 return 0;
915
916 if (attr == &dev_attr_queue_type.attr &&
917 !sdev->host->hostt->change_queue_type)
918 return S_IRUGO;
919
920 return attr->mode;
921}
922
923/* Default template for device attributes. May NOT be modified */
924static struct attribute *scsi_sdev_attrs[] = {
925 &dev_attr_device_blocked.attr,
926 &dev_attr_type.attr,
927 &dev_attr_scsi_level.attr,
928 &dev_attr_device_busy.attr,
929 &dev_attr_vendor.attr,
930 &dev_attr_model.attr,
931 &dev_attr_rev.attr,
932 &dev_attr_rescan.attr,
933 &dev_attr_delete.attr,
934 &dev_attr_state.attr,
935 &dev_attr_timeout.attr,
936 &dev_attr_eh_timeout.attr,
937 &dev_attr_iocounterbits.attr,
938 &dev_attr_iorequest_cnt.attr,
939 &dev_attr_iodone_cnt.attr,
940 &dev_attr_ioerr_cnt.attr,
941 &dev_attr_modalias.attr,
942 &dev_attr_queue_depth.attr,
943 &dev_attr_queue_type.attr,
944 &dev_attr_queue_ramp_up_period.attr,
945 REF_EVT(media_change),
946 REF_EVT(inquiry_change_reported),
947 REF_EVT(capacity_change_reported),
948 REF_EVT(soft_threshold_reached),
949 REF_EVT(mode_parameter_change_reported),
950 REF_EVT(lun_change_reported),
951 NULL
952};
953
954static struct bin_attribute *scsi_sdev_bin_attrs[] = {
955 &dev_attr_vpd_pg83,
956 &dev_attr_vpd_pg80,
957 NULL
958};
959static struct attribute_group scsi_sdev_attr_group = {
960 .attrs = scsi_sdev_attrs,
961 .bin_attrs = scsi_sdev_bin_attrs,
962 .is_visible = scsi_sdev_attr_is_visible,
963};
964
965static const struct attribute_group *scsi_sdev_attr_groups[] = {
966 &scsi_sdev_attr_group,
967 NULL
968};
969
970static int scsi_target_add(struct scsi_target *starget)
971{
972 int error;
973
974 if (starget->state != STARGET_CREATED)
975 return 0;
976
977 error = device_add(&starget->dev);
978 if (error) {
979 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
980 return error;
981 }
982 transport_add_device(&starget->dev);
983 starget->state = STARGET_RUNNING;
984
985 pm_runtime_set_active(&starget->dev);
986 pm_runtime_enable(&starget->dev);
987 device_enable_async_suspend(&starget->dev);
988
989 return 0;
990}
991
992/**
993 * scsi_sysfs_add_sdev - add scsi device to sysfs
994 * @sdev: scsi_device to add
995 *
996 * Return value:
997 * 0 on Success / non-zero on Failure
998 **/
999int scsi_sysfs_add_sdev(struct scsi_device *sdev)
1000{
1001 int error, i;
1002 struct request_queue *rq = sdev->request_queue;
1003 struct scsi_target *starget = sdev->sdev_target;
1004
1005 error = scsi_device_set_state(sdev, SDEV_RUNNING);
1006 if (error)
1007 return error;
1008
1009 error = scsi_target_add(starget);
1010 if (error)
1011 return error;
1012
1013 transport_configure_device(&starget->dev);
1014
1015 device_enable_async_suspend(&sdev->sdev_gendev);
1016 scsi_autopm_get_target(starget);
1017 pm_runtime_set_active(&sdev->sdev_gendev);
1018 pm_runtime_forbid(&sdev->sdev_gendev);
1019 pm_runtime_enable(&sdev->sdev_gendev);
1020 scsi_autopm_put_target(starget);
1021
1022 /* The following call will keep sdev active indefinitely, until
1023 * its driver does a corresponding scsi_autopm_pm_device(). Only
1024 * drivers supporting autosuspend will do this.
1025 */
1026 scsi_autopm_get_device(sdev);
1027
1028 error = device_add(&sdev->sdev_gendev);
1029 if (error) {
1030 sdev_printk(KERN_INFO, sdev,
1031 "failed to add device: %d\n", error);
1032 return error;
1033 }
1034 device_enable_async_suspend(&sdev->sdev_dev);
1035 error = device_add(&sdev->sdev_dev);
1036 if (error) {
1037 sdev_printk(KERN_INFO, sdev,
1038 "failed to add class device: %d\n", error);
1039 device_del(&sdev->sdev_gendev);
1040 return error;
1041 }
1042 transport_add_device(&sdev->sdev_gendev);
1043 sdev->is_visible = 1;
1044
1045 error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
1046
1047 if (error)
1048 /* we're treating error on bsg register as non-fatal,
1049 * so pretend nothing went wrong */
1050 sdev_printk(KERN_INFO, sdev,
1051 "Failed to register bsg queue, errno=%d\n", error);
1052
1053 /* add additional host specific attributes */
1054 if (sdev->host->hostt->sdev_attrs) {
1055 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
1056 error = device_create_file(&sdev->sdev_gendev,
1057 sdev->host->hostt->sdev_attrs[i]);
1058 if (error)
1059 return error;
1060 }
1061 }
1062
1063 return error;
1064}
1065
1066void __scsi_remove_device(struct scsi_device *sdev)
1067{
1068 struct device *dev = &sdev->sdev_gendev;
1069
1070 if (sdev->is_visible) {
1071 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
1072 return;
1073
1074 bsg_unregister_queue(sdev->request_queue);
1075 device_unregister(&sdev->sdev_dev);
1076 transport_remove_device(dev);
1077 device_del(dev);
1078 } else
1079 put_device(&sdev->sdev_dev);
1080
1081 /*
1082 * Stop accepting new requests and wait until all queuecommand() and
1083 * scsi_run_queue() invocations have finished before tearing down the
1084 * device.
1085 */
1086 scsi_device_set_state(sdev, SDEV_DEL);
1087 blk_cleanup_queue(sdev->request_queue);
1088 cancel_work_sync(&sdev->requeue_work);
1089
1090 if (sdev->host->hostt->slave_destroy)
1091 sdev->host->hostt->slave_destroy(sdev);
1092 transport_destroy_device(dev);
1093
1094 /*
1095 * Paired with the kref_get() in scsi_sysfs_initialize(). We have
1096 * remoed sysfs visibility from the device, so make the target
1097 * invisible if this was the last device underneath it.
1098 */
1099 scsi_target_reap(scsi_target(sdev));
1100
1101 put_device(dev);
1102}
1103
1104/**
1105 * scsi_remove_device - unregister a device from the scsi bus
1106 * @sdev: scsi_device to unregister
1107 **/
1108void scsi_remove_device(struct scsi_device *sdev)
1109{
1110 struct Scsi_Host *shost = sdev->host;
1111
1112 mutex_lock(&shost->scan_mutex);
1113 __scsi_remove_device(sdev);
1114 mutex_unlock(&shost->scan_mutex);
1115}
1116EXPORT_SYMBOL(scsi_remove_device);
1117
1118static void __scsi_remove_target(struct scsi_target *starget)
1119{
1120 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1121 unsigned long flags;
1122 struct scsi_device *sdev;
1123
1124 spin_lock_irqsave(shost->host_lock, flags);
1125 restart:
1126 list_for_each_entry(sdev, &shost->__devices, siblings) {
1127 if (sdev->channel != starget->channel ||
1128 sdev->id != starget->id ||
1129 scsi_device_get(sdev))
1130 continue;
1131 spin_unlock_irqrestore(shost->host_lock, flags);
1132 scsi_remove_device(sdev);
1133 scsi_device_put(sdev);
1134 spin_lock_irqsave(shost->host_lock, flags);
1135 goto restart;
1136 }
1137 spin_unlock_irqrestore(shost->host_lock, flags);
1138}
1139
1140/**
1141 * scsi_remove_target - try to remove a target and all its devices
1142 * @dev: generic starget or parent of generic stargets to be removed
1143 *
1144 * Note: This is slightly racy. It is possible that if the user
1145 * requests the addition of another device then the target won't be
1146 * removed.
1147 */
1148void scsi_remove_target(struct device *dev)
1149{
1150 struct Scsi_Host *shost = dev_to_shost(dev->parent);
1151 struct scsi_target *starget, *last = NULL;
1152 unsigned long flags;
1153
1154 /* remove targets being careful to lookup next entry before
1155 * deleting the last
1156 */
1157 spin_lock_irqsave(shost->host_lock, flags);
1158 list_for_each_entry(starget, &shost->__targets, siblings) {
1159 if (starget->state == STARGET_DEL)
1160 continue;
1161 if (starget->dev.parent == dev || &starget->dev == dev) {
1162 /* assuming new targets arrive at the end */
1163 kref_get(&starget->reap_ref);
1164 spin_unlock_irqrestore(shost->host_lock, flags);
1165 if (last)
1166 scsi_target_reap(last);
1167 last = starget;
1168 __scsi_remove_target(starget);
1169 spin_lock_irqsave(shost->host_lock, flags);
1170 }
1171 }
1172 spin_unlock_irqrestore(shost->host_lock, flags);
1173
1174 if (last)
1175 scsi_target_reap(last);
1176}
1177EXPORT_SYMBOL(scsi_remove_target);
1178
1179int scsi_register_driver(struct device_driver *drv)
1180{
1181 drv->bus = &scsi_bus_type;
1182
1183 return driver_register(drv);
1184}
1185EXPORT_SYMBOL(scsi_register_driver);
1186
1187int scsi_register_interface(struct class_interface *intf)
1188{
1189 intf->class = &sdev_class;
1190
1191 return class_interface_register(intf);
1192}
1193EXPORT_SYMBOL(scsi_register_interface);
1194
1195/**
1196 * scsi_sysfs_add_host - add scsi host to subsystem
1197 * @shost: scsi host struct to add to subsystem
1198 **/
1199int scsi_sysfs_add_host(struct Scsi_Host *shost)
1200{
1201 int error, i;
1202
1203 /* add host specific attributes */
1204 if (shost->hostt->shost_attrs) {
1205 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1206 error = device_create_file(&shost->shost_dev,
1207 shost->hostt->shost_attrs[i]);
1208 if (error)
1209 return error;
1210 }
1211 }
1212
1213 transport_register_device(&shost->shost_gendev);
1214 transport_configure_device(&shost->shost_gendev);
1215 return 0;
1216}
1217
1218static struct device_type scsi_dev_type = {
1219 .name = "scsi_device",
1220 .release = scsi_device_dev_release,
1221 .groups = scsi_sdev_attr_groups,
1222};
1223
1224void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1225{
1226 unsigned long flags;
1227 struct Scsi_Host *shost = sdev->host;
1228 struct scsi_target *starget = sdev->sdev_target;
1229
1230 device_initialize(&sdev->sdev_gendev);
1231 sdev->sdev_gendev.bus = &scsi_bus_type;
1232 sdev->sdev_gendev.type = &scsi_dev_type;
1233 dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%d",
1234 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1235
1236 device_initialize(&sdev->sdev_dev);
1237 sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1238 sdev->sdev_dev.class = &sdev_class;
1239 dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%d",
1240 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1241 sdev->scsi_level = starget->scsi_level;
1242 transport_setup_device(&sdev->sdev_gendev);
1243 spin_lock_irqsave(shost->host_lock, flags);
1244 list_add_tail(&sdev->same_target_siblings, &starget->devices);
1245 list_add_tail(&sdev->siblings, &shost->__devices);
1246 spin_unlock_irqrestore(shost->host_lock, flags);
1247 /*
1248 * device can now only be removed via __scsi_remove_device() so hold
1249 * the target. Target will be held in CREATED state until something
1250 * beneath it becomes visible (in which case it moves to RUNNING)
1251 */
1252 kref_get(&starget->reap_ref);
1253}
1254
1255int scsi_is_sdev_device(const struct device *dev)
1256{
1257 return dev->type == &scsi_dev_type;
1258}
1259EXPORT_SYMBOL(scsi_is_sdev_device);
1260
1261/* A blank transport template that is used in drivers that don't
1262 * yet implement Transport Attributes */
1263struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };