[SCSI] Fix race when removing SCSI devices
[linux-2.6.git] / drivers / scsi / scsi_sysfs.c
1 /*
2  * scsi_sysfs.c
3  *
4  * SCSI sysfs interface routines.
5  *
6  * Created to pull SCSI mid layer sysfs routines into one file.
7  */
8
9 #include <linux/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
26 static struct device_type scsi_dev_type;
27
28 static 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
42 const 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
56 static 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 };
68 const 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
82 static 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
99 static 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)                 \
126 static ssize_t                                                          \
127 show_##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)                 \
140 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
141
142 #define shost_rd_attr(field, format_string) \
143 shost_rd_attr2(field, field, format_string)
144
145 /*
146  * Create the actual show/store functions and data structures.
147  */
148
149 static ssize_t
150 store_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 };
161 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
162
163 static ssize_t
164 store_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
187 static ssize_t
188 show_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 */
200 struct device_attribute dev_attr_hstate =
201         __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
202
203 static ssize_t
204 show_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
219 static ssize_t
220 show_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
233 static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
234
235 static ssize_t
236 show_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
247 static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
248
249 shost_rd_attr(unique_id, "%u\n");
250 shost_rd_attr(host_busy, "%hu\n");
251 shost_rd_attr(cmd_per_lun, "%hd\n");
252 shost_rd_attr(can_queue, "%hd\n");
253 shost_rd_attr(sg_tablesize, "%hu\n");
254 shost_rd_attr(sg_prot_tablesize, "%hu\n");
255 shost_rd_attr(unchecked_isa_dma, "%d\n");
256 shost_rd_attr(prot_capabilities, "%u\n");
257 shost_rd_attr(prot_guard_type, "%hd\n");
258 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
259
260 static 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
278 struct attribute_group scsi_shost_attr_group = {
279         .attrs =        scsi_sysfs_shost_attrs,
280 };
281
282 const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
283         &scsi_shost_attr_group,
284         NULL
285 };
286
287 static 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
295 static 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         if (sdev->request_queue) {
326                 sdev->request_queue->queuedata = NULL;
327                 /* user context needed to free queue */
328                 scsi_free_queue(sdev->request_queue);
329                 /* temporary expedient, try to catch use of queue lock
330                  * after free of sdev */
331                 sdev->request_queue = NULL;
332         }
333
334         scsi_target_reap(scsi_target(sdev));
335
336         kfree(sdev->inquiry);
337         kfree(sdev);
338
339         if (parent)
340                 put_device(parent);
341 }
342
343 static void scsi_device_dev_release(struct device *dev)
344 {
345         struct scsi_device *sdp = to_scsi_device(dev);
346         execute_in_process_context(scsi_device_dev_release_usercontext,
347                                    &sdp->ew);
348 }
349
350 static struct class sdev_class = {
351         .name           = "scsi_device",
352         .dev_release    = scsi_device_cls_release,
353 };
354
355 /* all probing is done in the individual ->probe routines */
356 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
357 {
358         struct scsi_device *sdp;
359
360         if (dev->type != &scsi_dev_type)
361                 return 0;
362
363         sdp = to_scsi_device(dev);
364         if (sdp->no_uld_attach)
365                 return 0;
366         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
367 }
368
369 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
370 {
371         struct scsi_device *sdev;
372
373         if (dev->type != &scsi_dev_type)
374                 return 0;
375
376         sdev = to_scsi_device(dev);
377
378         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
379         return 0;
380 }
381
382 struct bus_type scsi_bus_type = {
383         .name           = "scsi",
384         .match          = scsi_bus_match,
385         .uevent         = scsi_bus_uevent,
386 #ifdef CONFIG_PM_OPS
387         .pm             = &scsi_bus_pm_ops,
388 #endif
389 };
390 EXPORT_SYMBOL_GPL(scsi_bus_type);
391
392 int scsi_sysfs_register(void)
393 {
394         int error;
395
396         error = bus_register(&scsi_bus_type);
397         if (!error) {
398                 error = class_register(&sdev_class);
399                 if (error)
400                         bus_unregister(&scsi_bus_type);
401         }
402
403         return error;
404 }
405
406 void scsi_sysfs_unregister(void)
407 {
408         class_unregister(&sdev_class);
409         bus_unregister(&scsi_bus_type);
410 }
411
412 /*
413  * sdev_show_function: macro to create an attr function that can be used to
414  * show a non-bit field.
415  */
416 #define sdev_show_function(field, format_string)                                \
417 static ssize_t                                                          \
418 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
419                    char *buf)                                           \
420 {                                                                       \
421         struct scsi_device *sdev;                                       \
422         sdev = to_scsi_device(dev);                                     \
423         return snprintf (buf, 20, format_string, sdev->field);          \
424 }                                                                       \
425
426 /*
427  * sdev_rd_attr: macro to create a function and attribute variable for a
428  * read only field.
429  */
430 #define sdev_rd_attr(field, format_string)                              \
431         sdev_show_function(field, format_string)                        \
432 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
433
434
435 /*
436  * sdev_rw_attr: create a function and attribute variable for a
437  * read/write field.
438  */
439 #define sdev_rw_attr(field, format_string)                              \
440         sdev_show_function(field, format_string)                                \
441                                                                         \
442 static ssize_t                                                          \
443 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
444                     const char *buf, size_t count)                      \
445 {                                                                       \
446         struct scsi_device *sdev;                                       \
447         sdev = to_scsi_device(dev);                                     \
448         sscanf (buf, format_string, &sdev->field);                      \
449         return count;                                                   \
450 }                                                                       \
451 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
452
453 /* Currently we don't export bit fields, but we might in future,
454  * so leave this code in */
455 #if 0
456 /*
457  * sdev_rd_attr: create a function and attribute variable for a
458  * read/write bit field.
459  */
460 #define sdev_rw_attr_bit(field)                                         \
461         sdev_show_function(field, "%d\n")                                       \
462                                                                         \
463 static ssize_t                                                          \
464 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
465                     const char *buf, size_t count)                      \
466 {                                                                       \
467         int ret;                                                        \
468         struct scsi_device *sdev;                                       \
469         ret = scsi_sdev_check_buf_bit(buf);                             \
470         if (ret >= 0)   {                                               \
471                 sdev = to_scsi_device(dev);                             \
472                 sdev->field = ret;                                      \
473                 ret = count;                                            \
474         }                                                               \
475         return ret;                                                     \
476 }                                                                       \
477 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
478
479 /*
480  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
481  * else return -EINVAL.
482  */
483 static int scsi_sdev_check_buf_bit(const char *buf)
484 {
485         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
486                 if (buf[0] == '1')
487                         return 1;
488                 else if (buf[0] == '0')
489                         return 0;
490                 else 
491                         return -EINVAL;
492         } else
493                 return -EINVAL;
494 }
495 #endif
496 /*
497  * Create the actual show/store functions and data structures.
498  */
499 sdev_rd_attr (device_blocked, "%d\n");
500 sdev_rd_attr (queue_depth, "%d\n");
501 sdev_rd_attr (type, "%d\n");
502 sdev_rd_attr (scsi_level, "%d\n");
503 sdev_rd_attr (vendor, "%.8s\n");
504 sdev_rd_attr (model, "%.16s\n");
505 sdev_rd_attr (rev, "%.4s\n");
506
507 /*
508  * TODO: can we make these symlinks to the block layer ones?
509  */
510 static ssize_t
511 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
512 {
513         struct scsi_device *sdev;
514         sdev = to_scsi_device(dev);
515         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
516 }
517
518 static ssize_t
519 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
520                     const char *buf, size_t count)
521 {
522         struct scsi_device *sdev;
523         int timeout;
524         sdev = to_scsi_device(dev);
525         sscanf (buf, "%d\n", &timeout);
526         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
527         return count;
528 }
529 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
530
531 static ssize_t
532 store_rescan_field (struct device *dev, struct device_attribute *attr,
533                     const char *buf, size_t count)
534 {
535         scsi_rescan_device(dev);
536         return count;
537 }
538 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
539
540 static void sdev_store_delete_callback(struct device *dev)
541 {
542         scsi_remove_device(to_scsi_device(dev));
543 }
544
545 static ssize_t
546 sdev_store_delete(struct device *dev, struct device_attribute *attr,
547                   const char *buf, size_t count)
548 {
549         int rc;
550
551         /* An attribute cannot be unregistered by one of its own methods,
552          * so we have to use this roundabout approach.
553          */
554         rc = device_schedule_callback(dev, sdev_store_delete_callback);
555         if (rc)
556                 count = rc;
557         return count;
558 };
559 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
560
561 static ssize_t
562 store_state_field(struct device *dev, struct device_attribute *attr,
563                   const char *buf, size_t count)
564 {
565         int i;
566         struct scsi_device *sdev = to_scsi_device(dev);
567         enum scsi_device_state state = 0;
568
569         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
570                 const int len = strlen(sdev_states[i].name);
571                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
572                    buf[len] == '\n') {
573                         state = sdev_states[i].value;
574                         break;
575                 }
576         }
577         if (!state)
578                 return -EINVAL;
579
580         if (scsi_device_set_state(sdev, state))
581                 return -EINVAL;
582         return count;
583 }
584
585 static ssize_t
586 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
587 {
588         struct scsi_device *sdev = to_scsi_device(dev);
589         const char *name = scsi_device_state_name(sdev->sdev_state);
590
591         if (!name)
592                 return -EINVAL;
593
594         return snprintf(buf, 20, "%s\n", name);
595 }
596
597 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
598
599 static ssize_t
600 show_queue_type_field(struct device *dev, struct device_attribute *attr,
601                       char *buf)
602 {
603         struct scsi_device *sdev = to_scsi_device(dev);
604         const char *name = "none";
605
606         if (sdev->ordered_tags)
607                 name = "ordered";
608         else if (sdev->simple_tags)
609                 name = "simple";
610
611         return snprintf(buf, 20, "%s\n", name);
612 }
613
614 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
615
616 static ssize_t
617 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,                              char *buf)
618 {
619         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
620 }
621
622 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
623
624 #define show_sdev_iostat(field)                                         \
625 static ssize_t                                                          \
626 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
627                     char *buf)                                          \
628 {                                                                       \
629         struct scsi_device *sdev = to_scsi_device(dev);                 \
630         unsigned long long count = atomic_read(&sdev->field);           \
631         return snprintf(buf, 20, "0x%llx\n", count);                    \
632 }                                                                       \
633 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
634
635 show_sdev_iostat(iorequest_cnt);
636 show_sdev_iostat(iodone_cnt);
637 show_sdev_iostat(ioerr_cnt);
638
639 static ssize_t
640 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
641 {
642         struct scsi_device *sdev;
643         sdev = to_scsi_device(dev);
644         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
645 }
646 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
647
648 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
649 static ssize_t                                                          \
650 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
651                      char *buf)                                         \
652 {                                                                       \
653         struct scsi_device *sdev = to_scsi_device(dev);                 \
654         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
655         return snprintf(buf, 20, "%d\n", val);                          \
656 }
657
658 #define DECLARE_EVT_STORE(name, Cap_name)                               \
659 static ssize_t                                                          \
660 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
661                       const char *buf, size_t count)                    \
662 {                                                                       \
663         struct scsi_device *sdev = to_scsi_device(dev);                 \
664         int val = simple_strtoul(buf, NULL, 0);                         \
665         if (val == 0)                                                   \
666                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
667         else if (val == 1)                                              \
668                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
669         else                                                            \
670                 return -EINVAL;                                         \
671         return count;                                                   \
672 }
673
674 #define DECLARE_EVT(name, Cap_name)                                     \
675         DECLARE_EVT_SHOW(name, Cap_name)                                \
676         DECLARE_EVT_STORE(name, Cap_name)                               \
677         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
678                            sdev_store_evt_##name);
679 #define REF_EVT(name) &dev_attr_evt_##name.attr
680
681 DECLARE_EVT(media_change, MEDIA_CHANGE)
682
683 /* Default template for device attributes.  May NOT be modified */
684 static struct attribute *scsi_sdev_attrs[] = {
685         &dev_attr_device_blocked.attr,
686         &dev_attr_type.attr,
687         &dev_attr_scsi_level.attr,
688         &dev_attr_vendor.attr,
689         &dev_attr_model.attr,
690         &dev_attr_rev.attr,
691         &dev_attr_rescan.attr,
692         &dev_attr_delete.attr,
693         &dev_attr_state.attr,
694         &dev_attr_timeout.attr,
695         &dev_attr_iocounterbits.attr,
696         &dev_attr_iorequest_cnt.attr,
697         &dev_attr_iodone_cnt.attr,
698         &dev_attr_ioerr_cnt.attr,
699         &dev_attr_modalias.attr,
700         REF_EVT(media_change),
701         NULL
702 };
703
704 static struct attribute_group scsi_sdev_attr_group = {
705         .attrs =        scsi_sdev_attrs,
706 };
707
708 static const struct attribute_group *scsi_sdev_attr_groups[] = {
709         &scsi_sdev_attr_group,
710         NULL
711 };
712
713 static ssize_t
714 sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
715                           const char *buf, size_t count)
716 {
717         int depth, retval;
718         struct scsi_device *sdev = to_scsi_device(dev);
719         struct scsi_host_template *sht = sdev->host->hostt;
720
721         if (!sht->change_queue_depth)
722                 return -EINVAL;
723
724         depth = simple_strtoul(buf, NULL, 0);
725
726         if (depth < 1)
727                 return -EINVAL;
728
729         retval = sht->change_queue_depth(sdev, depth,
730                                          SCSI_QDEPTH_DEFAULT);
731         if (retval < 0)
732                 return retval;
733
734         sdev->max_queue_depth = sdev->queue_depth;
735
736         return count;
737 }
738
739 static struct device_attribute sdev_attr_queue_depth_rw =
740         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
741                sdev_store_queue_depth_rw);
742
743 static ssize_t
744 sdev_show_queue_ramp_up_period(struct device *dev,
745                                struct device_attribute *attr,
746                                char *buf)
747 {
748         struct scsi_device *sdev;
749         sdev = to_scsi_device(dev);
750         return snprintf(buf, 20, "%u\n",
751                         jiffies_to_msecs(sdev->queue_ramp_up_period));
752 }
753
754 static ssize_t
755 sdev_store_queue_ramp_up_period(struct device *dev,
756                                 struct device_attribute *attr,
757                                 const char *buf, size_t count)
758 {
759         struct scsi_device *sdev = to_scsi_device(dev);
760         unsigned long period;
761
762         if (strict_strtoul(buf, 10, &period))
763                 return -EINVAL;
764
765         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
766         return period;
767 }
768
769 static struct device_attribute sdev_attr_queue_ramp_up_period =
770         __ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
771                sdev_show_queue_ramp_up_period,
772                sdev_store_queue_ramp_up_period);
773
774 static ssize_t
775 sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
776                          const char *buf, size_t count)
777 {
778         struct scsi_device *sdev = to_scsi_device(dev);
779         struct scsi_host_template *sht = sdev->host->hostt;
780         int tag_type = 0, retval;
781         int prev_tag_type = scsi_get_tag_type(sdev);
782
783         if (!sdev->tagged_supported || !sht->change_queue_type)
784                 return -EINVAL;
785
786         if (strncmp(buf, "ordered", 7) == 0)
787                 tag_type = MSG_ORDERED_TAG;
788         else if (strncmp(buf, "simple", 6) == 0)
789                 tag_type = MSG_SIMPLE_TAG;
790         else if (strncmp(buf, "none", 4) != 0)
791                 return -EINVAL;
792
793         if (tag_type == prev_tag_type)
794                 return count;
795
796         retval = sht->change_queue_type(sdev, tag_type);
797         if (retval < 0)
798                 return retval;
799
800         return count;
801 }
802
803 static int scsi_target_add(struct scsi_target *starget)
804 {
805         int error;
806
807         if (starget->state != STARGET_CREATED)
808                 return 0;
809
810         error = device_add(&starget->dev);
811         if (error) {
812                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
813                 return error;
814         }
815         transport_add_device(&starget->dev);
816         starget->state = STARGET_RUNNING;
817
818         pm_runtime_set_active(&starget->dev);
819         pm_runtime_enable(&starget->dev);
820         device_enable_async_suspend(&starget->dev);
821
822         return 0;
823 }
824
825 static struct device_attribute sdev_attr_queue_type_rw =
826         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
827                sdev_store_queue_type_rw);
828
829 /**
830  * scsi_sysfs_add_sdev - add scsi device to sysfs
831  * @sdev:       scsi_device to add
832  *
833  * Return value:
834  *      0 on Success / non-zero on Failure
835  **/
836 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
837 {
838         int error, i;
839         struct request_queue *rq = sdev->request_queue;
840         struct scsi_target *starget = sdev->sdev_target;
841
842         error = scsi_device_set_state(sdev, SDEV_RUNNING);
843         if (error)
844                 return error;
845
846         error = scsi_target_add(starget);
847         if (error)
848                 return error;
849
850         transport_configure_device(&starget->dev);
851
852         device_enable_async_suspend(&sdev->sdev_gendev);
853         scsi_autopm_get_target(starget);
854         pm_runtime_set_active(&sdev->sdev_gendev);
855         pm_runtime_forbid(&sdev->sdev_gendev);
856         pm_runtime_enable(&sdev->sdev_gendev);
857         scsi_autopm_put_target(starget);
858
859         /* The following call will keep sdev active indefinitely, until
860          * its driver does a corresponding scsi_autopm_pm_device().  Only
861          * drivers supporting autosuspend will do this.
862          */
863         scsi_autopm_get_device(sdev);
864
865         error = device_add(&sdev->sdev_gendev);
866         if (error) {
867                 printk(KERN_INFO "error 1\n");
868                 return error;
869         }
870         device_enable_async_suspend(&sdev->sdev_dev);
871         error = device_add(&sdev->sdev_dev);
872         if (error) {
873                 printk(KERN_INFO "error 2\n");
874                 device_del(&sdev->sdev_gendev);
875                 return error;
876         }
877         transport_add_device(&sdev->sdev_gendev);
878         sdev->is_visible = 1;
879
880         /* create queue files, which may be writable, depending on the host */
881         if (sdev->host->hostt->change_queue_depth) {
882                 error = device_create_file(&sdev->sdev_gendev,
883                                            &sdev_attr_queue_depth_rw);
884                 error = device_create_file(&sdev->sdev_gendev,
885                                            &sdev_attr_queue_ramp_up_period);
886         }
887         else
888                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
889         if (error)
890                 return error;
891
892         if (sdev->host->hostt->change_queue_type)
893                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
894         else
895                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
896         if (error)
897                 return error;
898
899         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
900
901         if (error)
902                 /* we're treating error on bsg register as non-fatal,
903                  * so pretend nothing went wrong */
904                 sdev_printk(KERN_INFO, sdev,
905                             "Failed to register bsg queue, errno=%d\n", error);
906
907         /* add additional host specific attributes */
908         if (sdev->host->hostt->sdev_attrs) {
909                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
910                         error = device_create_file(&sdev->sdev_gendev,
911                                         sdev->host->hostt->sdev_attrs[i]);
912                         if (error)
913                                 return error;
914                 }
915         }
916
917         return error;
918 }
919
920 void __scsi_remove_device(struct scsi_device *sdev)
921 {
922         struct device *dev = &sdev->sdev_gendev;
923
924         if (sdev->is_visible) {
925                 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
926                         return;
927
928                 bsg_unregister_queue(sdev->request_queue);
929                 device_unregister(&sdev->sdev_dev);
930                 transport_remove_device(dev);
931                 device_del(dev);
932         } else
933                 put_device(&sdev->sdev_dev);
934         scsi_device_set_state(sdev, SDEV_DEL);
935         if (sdev->host->hostt->slave_destroy)
936                 sdev->host->hostt->slave_destroy(sdev);
937         transport_destroy_device(dev);
938         put_device(dev);
939 }
940
941 /**
942  * scsi_remove_device - unregister a device from the scsi bus
943  * @sdev:       scsi_device to unregister
944  **/
945 void scsi_remove_device(struct scsi_device *sdev)
946 {
947         struct Scsi_Host *shost = sdev->host;
948
949         mutex_lock(&shost->scan_mutex);
950         __scsi_remove_device(sdev);
951         mutex_unlock(&shost->scan_mutex);
952 }
953 EXPORT_SYMBOL(scsi_remove_device);
954
955 static void __scsi_remove_target(struct scsi_target *starget)
956 {
957         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
958         unsigned long flags;
959         struct scsi_device *sdev;
960
961         spin_lock_irqsave(shost->host_lock, flags);
962         starget->reap_ref++;
963  restart:
964         list_for_each_entry(sdev, &shost->__devices, siblings) {
965                 if (sdev->channel != starget->channel ||
966                     sdev->id != starget->id ||
967                     scsi_device_get(sdev))
968                         continue;
969                 spin_unlock_irqrestore(shost->host_lock, flags);
970                 scsi_remove_device(sdev);
971                 scsi_device_put(sdev);
972                 spin_lock_irqsave(shost->host_lock, flags);
973                 goto restart;
974         }
975         spin_unlock_irqrestore(shost->host_lock, flags);
976         scsi_target_reap(starget);
977 }
978
979 static int __remove_child (struct device * dev, void * data)
980 {
981         if (scsi_is_target_device(dev))
982                 __scsi_remove_target(to_scsi_target(dev));
983         return 0;
984 }
985
986 /**
987  * scsi_remove_target - try to remove a target and all its devices
988  * @dev: generic starget or parent of generic stargets to be removed
989  *
990  * Note: This is slightly racy.  It is possible that if the user
991  * requests the addition of another device then the target won't be
992  * removed.
993  */
994 void scsi_remove_target(struct device *dev)
995 {
996         struct device *rdev;
997
998         if (scsi_is_target_device(dev)) {
999                 __scsi_remove_target(to_scsi_target(dev));
1000                 return;
1001         }
1002
1003         rdev = get_device(dev);
1004         device_for_each_child(dev, NULL, __remove_child);
1005         put_device(rdev);
1006 }
1007 EXPORT_SYMBOL(scsi_remove_target);
1008
1009 int scsi_register_driver(struct device_driver *drv)
1010 {
1011         drv->bus = &scsi_bus_type;
1012
1013         return driver_register(drv);
1014 }
1015 EXPORT_SYMBOL(scsi_register_driver);
1016
1017 int scsi_register_interface(struct class_interface *intf)
1018 {
1019         intf->class = &sdev_class;
1020
1021         return class_interface_register(intf);
1022 }
1023 EXPORT_SYMBOL(scsi_register_interface);
1024
1025 /**
1026  * scsi_sysfs_add_host - add scsi host to subsystem
1027  * @shost:     scsi host struct to add to subsystem
1028  **/
1029 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1030 {
1031         int error, i;
1032
1033         /* add host specific attributes */
1034         if (shost->hostt->shost_attrs) {
1035                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1036                         error = device_create_file(&shost->shost_dev,
1037                                         shost->hostt->shost_attrs[i]);
1038                         if (error)
1039                                 return error;
1040                 }
1041         }
1042
1043         transport_register_device(&shost->shost_gendev);
1044         transport_configure_device(&shost->shost_gendev);
1045         return 0;
1046 }
1047
1048 static struct device_type scsi_dev_type = {
1049         .name =         "scsi_device",
1050         .release =      scsi_device_dev_release,
1051         .groups =       scsi_sdev_attr_groups,
1052 };
1053
1054 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1055 {
1056         unsigned long flags;
1057         struct Scsi_Host *shost = sdev->host;
1058         struct scsi_target  *starget = sdev->sdev_target;
1059
1060         device_initialize(&sdev->sdev_gendev);
1061         sdev->sdev_gendev.bus = &scsi_bus_type;
1062         sdev->sdev_gendev.type = &scsi_dev_type;
1063         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%d",
1064                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1065
1066         device_initialize(&sdev->sdev_dev);
1067         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1068         sdev->sdev_dev.class = &sdev_class;
1069         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%d",
1070                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1071         sdev->scsi_level = starget->scsi_level;
1072         transport_setup_device(&sdev->sdev_gendev);
1073         spin_lock_irqsave(shost->host_lock, flags);
1074         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1075         list_add_tail(&sdev->siblings, &shost->__devices);
1076         spin_unlock_irqrestore(shost->host_lock, flags);
1077 }
1078
1079 int scsi_is_sdev_device(const struct device *dev)
1080 {
1081         return dev->type == &scsi_dev_type;
1082 }
1083 EXPORT_SYMBOL(scsi_is_sdev_device);
1084
1085 /* A blank transport template that is used in drivers that don't
1086  * yet implement Transport Attributes */
1087 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };