562fb3bce2611b2366603c723a2ae7192d0ad9f4
[sfrench/cifs-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(unchecked_isa_dma, "%d\n");
255 shost_rd_attr(prot_capabilities, "%u\n");
256 shost_rd_attr(prot_guard_type, "%hd\n");
257 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
258
259 static struct attribute *scsi_sysfs_shost_attrs[] = {
260         &dev_attr_unique_id.attr,
261         &dev_attr_host_busy.attr,
262         &dev_attr_cmd_per_lun.attr,
263         &dev_attr_can_queue.attr,
264         &dev_attr_sg_tablesize.attr,
265         &dev_attr_unchecked_isa_dma.attr,
266         &dev_attr_proc_name.attr,
267         &dev_attr_scan.attr,
268         &dev_attr_hstate.attr,
269         &dev_attr_supported_mode.attr,
270         &dev_attr_active_mode.attr,
271         &dev_attr_prot_capabilities.attr,
272         &dev_attr_prot_guard_type.attr,
273         NULL
274 };
275
276 struct attribute_group scsi_shost_attr_group = {
277         .attrs =        scsi_sysfs_shost_attrs,
278 };
279
280 const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
281         &scsi_shost_attr_group,
282         NULL
283 };
284
285 static void scsi_device_cls_release(struct device *class_dev)
286 {
287         struct scsi_device *sdev;
288
289         sdev = class_to_sdev(class_dev);
290         put_device(&sdev->sdev_gendev);
291 }
292
293 static void scsi_device_dev_release_usercontext(struct work_struct *work)
294 {
295         struct scsi_device *sdev;
296         struct device *parent;
297         struct scsi_target *starget;
298         struct list_head *this, *tmp;
299         unsigned long flags;
300
301         sdev = container_of(work, struct scsi_device, ew.work);
302
303         parent = sdev->sdev_gendev.parent;
304         starget = to_scsi_target(parent);
305
306         spin_lock_irqsave(sdev->host->host_lock, flags);
307         starget->reap_ref++;
308         list_del(&sdev->siblings);
309         list_del(&sdev->same_target_siblings);
310         list_del(&sdev->starved_entry);
311         spin_unlock_irqrestore(sdev->host->host_lock, flags);
312
313         cancel_work_sync(&sdev->event_work);
314
315         list_for_each_safe(this, tmp, &sdev->event_list) {
316                 struct scsi_event *evt;
317
318                 evt = list_entry(this, struct scsi_event, node);
319                 list_del(&evt->node);
320                 kfree(evt);
321         }
322
323         if (sdev->request_queue) {
324                 sdev->request_queue->queuedata = NULL;
325                 /* user context needed to free queue */
326                 scsi_free_queue(sdev->request_queue);
327                 /* temporary expedient, try to catch use of queue lock
328                  * after free of sdev */
329                 sdev->request_queue = NULL;
330         }
331
332         scsi_target_reap(scsi_target(sdev));
333
334         kfree(sdev->inquiry);
335         kfree(sdev);
336
337         if (parent)
338                 put_device(parent);
339 }
340
341 static void scsi_device_dev_release(struct device *dev)
342 {
343         struct scsi_device *sdp = to_scsi_device(dev);
344         execute_in_process_context(scsi_device_dev_release_usercontext,
345                                    &sdp->ew);
346 }
347
348 static struct class sdev_class = {
349         .name           = "scsi_device",
350         .dev_release    = scsi_device_cls_release,
351 };
352
353 /* all probing is done in the individual ->probe routines */
354 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
355 {
356         struct scsi_device *sdp;
357
358         if (dev->type != &scsi_dev_type)
359                 return 0;
360
361         sdp = to_scsi_device(dev);
362         if (sdp->no_uld_attach)
363                 return 0;
364         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
365 }
366
367 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
368 {
369         struct scsi_device *sdev;
370
371         if (dev->type != &scsi_dev_type)
372                 return 0;
373
374         sdev = to_scsi_device(dev);
375
376         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
377         return 0;
378 }
379
380 struct bus_type scsi_bus_type = {
381         .name           = "scsi",
382         .match          = scsi_bus_match,
383         .uevent         = scsi_bus_uevent,
384         .pm             = &scsi_bus_pm_ops,
385 };
386 EXPORT_SYMBOL_GPL(scsi_bus_type);
387
388 int scsi_sysfs_register(void)
389 {
390         int error;
391
392         error = bus_register(&scsi_bus_type);
393         if (!error) {
394                 error = class_register(&sdev_class);
395                 if (error)
396                         bus_unregister(&scsi_bus_type);
397         }
398
399         return error;
400 }
401
402 void scsi_sysfs_unregister(void)
403 {
404         class_unregister(&sdev_class);
405         bus_unregister(&scsi_bus_type);
406 }
407
408 /*
409  * sdev_show_function: macro to create an attr function that can be used to
410  * show a non-bit field.
411  */
412 #define sdev_show_function(field, format_string)                                \
413 static ssize_t                                                          \
414 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
415                    char *buf)                                           \
416 {                                                                       \
417         struct scsi_device *sdev;                                       \
418         sdev = to_scsi_device(dev);                                     \
419         return snprintf (buf, 20, format_string, sdev->field);          \
420 }                                                                       \
421
422 /*
423  * sdev_rd_attr: macro to create a function and attribute variable for a
424  * read only field.
425  */
426 #define sdev_rd_attr(field, format_string)                              \
427         sdev_show_function(field, format_string)                        \
428 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
429
430
431 /*
432  * sdev_rw_attr: create a function and attribute variable for a
433  * read/write field.
434  */
435 #define sdev_rw_attr(field, format_string)                              \
436         sdev_show_function(field, format_string)                                \
437                                                                         \
438 static ssize_t                                                          \
439 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
440                     const char *buf, size_t count)                      \
441 {                                                                       \
442         struct scsi_device *sdev;                                       \
443         sdev = to_scsi_device(dev);                                     \
444         sscanf (buf, format_string, &sdev->field);                      \
445         return count;                                                   \
446 }                                                                       \
447 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
448
449 /* Currently we don't export bit fields, but we might in future,
450  * so leave this code in */
451 #if 0
452 /*
453  * sdev_rd_attr: create a function and attribute variable for a
454  * read/write bit field.
455  */
456 #define sdev_rw_attr_bit(field)                                         \
457         sdev_show_function(field, "%d\n")                                       \
458                                                                         \
459 static ssize_t                                                          \
460 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
461                     const char *buf, size_t count)                      \
462 {                                                                       \
463         int ret;                                                        \
464         struct scsi_device *sdev;                                       \
465         ret = scsi_sdev_check_buf_bit(buf);                             \
466         if (ret >= 0)   {                                               \
467                 sdev = to_scsi_device(dev);                             \
468                 sdev->field = ret;                                      \
469                 ret = count;                                            \
470         }                                                               \
471         return ret;                                                     \
472 }                                                                       \
473 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
474
475 /*
476  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
477  * else return -EINVAL.
478  */
479 static int scsi_sdev_check_buf_bit(const char *buf)
480 {
481         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
482                 if (buf[0] == '1')
483                         return 1;
484                 else if (buf[0] == '0')
485                         return 0;
486                 else 
487                         return -EINVAL;
488         } else
489                 return -EINVAL;
490 }
491 #endif
492 /*
493  * Create the actual show/store functions and data structures.
494  */
495 sdev_rd_attr (device_blocked, "%d\n");
496 sdev_rd_attr (queue_depth, "%d\n");
497 sdev_rd_attr (type, "%d\n");
498 sdev_rd_attr (scsi_level, "%d\n");
499 sdev_rd_attr (vendor, "%.8s\n");
500 sdev_rd_attr (model, "%.16s\n");
501 sdev_rd_attr (rev, "%.4s\n");
502
503 /*
504  * TODO: can we make these symlinks to the block layer ones?
505  */
506 static ssize_t
507 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
508 {
509         struct scsi_device *sdev;
510         sdev = to_scsi_device(dev);
511         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
512 }
513
514 static ssize_t
515 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
516                     const char *buf, size_t count)
517 {
518         struct scsi_device *sdev;
519         int timeout;
520         sdev = to_scsi_device(dev);
521         sscanf (buf, "%d\n", &timeout);
522         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
523         return count;
524 }
525 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
526
527 static ssize_t
528 store_rescan_field (struct device *dev, struct device_attribute *attr,
529                     const char *buf, size_t count)
530 {
531         scsi_rescan_device(dev);
532         return count;
533 }
534 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
535
536 static void sdev_store_delete_callback(struct device *dev)
537 {
538         scsi_remove_device(to_scsi_device(dev));
539 }
540
541 static ssize_t
542 sdev_store_delete(struct device *dev, struct device_attribute *attr,
543                   const char *buf, size_t count)
544 {
545         int rc;
546
547         /* An attribute cannot be unregistered by one of its own methods,
548          * so we have to use this roundabout approach.
549          */
550         rc = device_schedule_callback(dev, sdev_store_delete_callback);
551         if (rc)
552                 count = rc;
553         return count;
554 };
555 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
556
557 static ssize_t
558 store_state_field(struct device *dev, struct device_attribute *attr,
559                   const char *buf, size_t count)
560 {
561         int i;
562         struct scsi_device *sdev = to_scsi_device(dev);
563         enum scsi_device_state state = 0;
564
565         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
566                 const int len = strlen(sdev_states[i].name);
567                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
568                    buf[len] == '\n') {
569                         state = sdev_states[i].value;
570                         break;
571                 }
572         }
573         if (!state)
574                 return -EINVAL;
575
576         if (scsi_device_set_state(sdev, state))
577                 return -EINVAL;
578         return count;
579 }
580
581 static ssize_t
582 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
583 {
584         struct scsi_device *sdev = to_scsi_device(dev);
585         const char *name = scsi_device_state_name(sdev->sdev_state);
586
587         if (!name)
588                 return -EINVAL;
589
590         return snprintf(buf, 20, "%s\n", name);
591 }
592
593 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
594
595 static ssize_t
596 show_queue_type_field(struct device *dev, struct device_attribute *attr,
597                       char *buf)
598 {
599         struct scsi_device *sdev = to_scsi_device(dev);
600         const char *name = "none";
601
602         if (sdev->ordered_tags)
603                 name = "ordered";
604         else if (sdev->simple_tags)
605                 name = "simple";
606
607         return snprintf(buf, 20, "%s\n", name);
608 }
609
610 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
611
612 static ssize_t
613 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,                              char *buf)
614 {
615         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
616 }
617
618 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
619
620 #define show_sdev_iostat(field)                                         \
621 static ssize_t                                                          \
622 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
623                     char *buf)                                          \
624 {                                                                       \
625         struct scsi_device *sdev = to_scsi_device(dev);                 \
626         unsigned long long count = atomic_read(&sdev->field);           \
627         return snprintf(buf, 20, "0x%llx\n", count);                    \
628 }                                                                       \
629 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
630
631 show_sdev_iostat(iorequest_cnt);
632 show_sdev_iostat(iodone_cnt);
633 show_sdev_iostat(ioerr_cnt);
634
635 static ssize_t
636 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
637 {
638         struct scsi_device *sdev;
639         sdev = to_scsi_device(dev);
640         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
641 }
642 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
643
644 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
645 static ssize_t                                                          \
646 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
647                      char *buf)                                         \
648 {                                                                       \
649         struct scsi_device *sdev = to_scsi_device(dev);                 \
650         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
651         return snprintf(buf, 20, "%d\n", val);                          \
652 }
653
654 #define DECLARE_EVT_STORE(name, Cap_name)                               \
655 static ssize_t                                                          \
656 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
657                       const char *buf, size_t count)                    \
658 {                                                                       \
659         struct scsi_device *sdev = to_scsi_device(dev);                 \
660         int val = simple_strtoul(buf, NULL, 0);                         \
661         if (val == 0)                                                   \
662                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
663         else if (val == 1)                                              \
664                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
665         else                                                            \
666                 return -EINVAL;                                         \
667         return count;                                                   \
668 }
669
670 #define DECLARE_EVT(name, Cap_name)                                     \
671         DECLARE_EVT_SHOW(name, Cap_name)                                \
672         DECLARE_EVT_STORE(name, Cap_name)                               \
673         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
674                            sdev_store_evt_##name);
675 #define REF_EVT(name) &dev_attr_evt_##name.attr
676
677 DECLARE_EVT(media_change, MEDIA_CHANGE)
678
679 /* Default template for device attributes.  May NOT be modified */
680 static struct attribute *scsi_sdev_attrs[] = {
681         &dev_attr_device_blocked.attr,
682         &dev_attr_type.attr,
683         &dev_attr_scsi_level.attr,
684         &dev_attr_vendor.attr,
685         &dev_attr_model.attr,
686         &dev_attr_rev.attr,
687         &dev_attr_rescan.attr,
688         &dev_attr_delete.attr,
689         &dev_attr_state.attr,
690         &dev_attr_timeout.attr,
691         &dev_attr_iocounterbits.attr,
692         &dev_attr_iorequest_cnt.attr,
693         &dev_attr_iodone_cnt.attr,
694         &dev_attr_ioerr_cnt.attr,
695         &dev_attr_modalias.attr,
696         REF_EVT(media_change),
697         NULL
698 };
699
700 static struct attribute_group scsi_sdev_attr_group = {
701         .attrs =        scsi_sdev_attrs,
702 };
703
704 static const struct attribute_group *scsi_sdev_attr_groups[] = {
705         &scsi_sdev_attr_group,
706         NULL
707 };
708
709 static ssize_t
710 sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
711                           const char *buf, size_t count)
712 {
713         int depth, retval;
714         struct scsi_device *sdev = to_scsi_device(dev);
715         struct scsi_host_template *sht = sdev->host->hostt;
716
717         if (!sht->change_queue_depth)
718                 return -EINVAL;
719
720         depth = simple_strtoul(buf, NULL, 0);
721
722         if (depth < 1)
723                 return -EINVAL;
724
725         retval = sht->change_queue_depth(sdev, depth,
726                                          SCSI_QDEPTH_DEFAULT);
727         if (retval < 0)
728                 return retval;
729
730         sdev->max_queue_depth = sdev->queue_depth;
731
732         return count;
733 }
734
735 static struct device_attribute sdev_attr_queue_depth_rw =
736         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
737                sdev_store_queue_depth_rw);
738
739 static ssize_t
740 sdev_show_queue_ramp_up_period(struct device *dev,
741                                struct device_attribute *attr,
742                                char *buf)
743 {
744         struct scsi_device *sdev;
745         sdev = to_scsi_device(dev);
746         return snprintf(buf, 20, "%u\n",
747                         jiffies_to_msecs(sdev->queue_ramp_up_period));
748 }
749
750 static ssize_t
751 sdev_store_queue_ramp_up_period(struct device *dev,
752                                 struct device_attribute *attr,
753                                 const char *buf, size_t count)
754 {
755         struct scsi_device *sdev = to_scsi_device(dev);
756         unsigned long period;
757
758         if (strict_strtoul(buf, 10, &period))
759                 return -EINVAL;
760
761         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
762         return period;
763 }
764
765 static struct device_attribute sdev_attr_queue_ramp_up_period =
766         __ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
767                sdev_show_queue_ramp_up_period,
768                sdev_store_queue_ramp_up_period);
769
770 static ssize_t
771 sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
772                          const char *buf, size_t count)
773 {
774         struct scsi_device *sdev = to_scsi_device(dev);
775         struct scsi_host_template *sht = sdev->host->hostt;
776         int tag_type = 0, retval;
777         int prev_tag_type = scsi_get_tag_type(sdev);
778
779         if (!sdev->tagged_supported || !sht->change_queue_type)
780                 return -EINVAL;
781
782         if (strncmp(buf, "ordered", 7) == 0)
783                 tag_type = MSG_ORDERED_TAG;
784         else if (strncmp(buf, "simple", 6) == 0)
785                 tag_type = MSG_SIMPLE_TAG;
786         else if (strncmp(buf, "none", 4) != 0)
787                 return -EINVAL;
788
789         if (tag_type == prev_tag_type)
790                 return count;
791
792         retval = sht->change_queue_type(sdev, tag_type);
793         if (retval < 0)
794                 return retval;
795
796         return count;
797 }
798
799 static int scsi_target_add(struct scsi_target *starget)
800 {
801         int error;
802
803         if (starget->state != STARGET_CREATED)
804                 return 0;
805
806         error = device_add(&starget->dev);
807         if (error) {
808                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
809                 return error;
810         }
811         transport_add_device(&starget->dev);
812         starget->state = STARGET_RUNNING;
813
814         pm_runtime_set_active(&starget->dev);
815         pm_runtime_enable(&starget->dev);
816         device_enable_async_suspend(&starget->dev);
817
818         return 0;
819 }
820
821 static struct device_attribute sdev_attr_queue_type_rw =
822         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
823                sdev_store_queue_type_rw);
824
825 /**
826  * scsi_sysfs_add_sdev - add scsi device to sysfs
827  * @sdev:       scsi_device to add
828  *
829  * Return value:
830  *      0 on Success / non-zero on Failure
831  **/
832 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
833 {
834         int error, i;
835         struct request_queue *rq = sdev->request_queue;
836         struct scsi_target *starget = sdev->sdev_target;
837
838         error = scsi_device_set_state(sdev, SDEV_RUNNING);
839         if (error)
840                 return error;
841
842         error = scsi_target_add(starget);
843         if (error)
844                 return error;
845
846         transport_configure_device(&starget->dev);
847
848         device_enable_async_suspend(&sdev->sdev_gendev);
849         scsi_autopm_get_target(starget);
850         pm_runtime_set_active(&sdev->sdev_gendev);
851         pm_runtime_forbid(&sdev->sdev_gendev);
852         pm_runtime_enable(&sdev->sdev_gendev);
853         scsi_autopm_put_target(starget);
854
855         /* The following call will keep sdev active indefinitely, until
856          * its driver does a corresponding scsi_autopm_pm_device().  Only
857          * drivers supporting autosuspend will do this.
858          */
859         scsi_autopm_get_device(sdev);
860
861         error = device_add(&sdev->sdev_gendev);
862         if (error) {
863                 printk(KERN_INFO "error 1\n");
864                 return error;
865         }
866         device_enable_async_suspend(&sdev->sdev_dev);
867         error = device_add(&sdev->sdev_dev);
868         if (error) {
869                 printk(KERN_INFO "error 2\n");
870                 device_del(&sdev->sdev_gendev);
871                 return error;
872         }
873         transport_add_device(&sdev->sdev_gendev);
874         sdev->is_visible = 1;
875
876         /* create queue files, which may be writable, depending on the host */
877         if (sdev->host->hostt->change_queue_depth) {
878                 error = device_create_file(&sdev->sdev_gendev,
879                                            &sdev_attr_queue_depth_rw);
880                 error = device_create_file(&sdev->sdev_gendev,
881                                            &sdev_attr_queue_ramp_up_period);
882         }
883         else
884                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
885         if (error)
886                 return error;
887
888         if (sdev->host->hostt->change_queue_type)
889                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
890         else
891                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
892         if (error)
893                 return error;
894
895         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
896
897         if (error)
898                 /* we're treating error on bsg register as non-fatal,
899                  * so pretend nothing went wrong */
900                 sdev_printk(KERN_INFO, sdev,
901                             "Failed to register bsg queue, errno=%d\n", error);
902
903         /* add additional host specific attributes */
904         if (sdev->host->hostt->sdev_attrs) {
905                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
906                         error = device_create_file(&sdev->sdev_gendev,
907                                         sdev->host->hostt->sdev_attrs[i]);
908                         if (error)
909                                 return error;
910                 }
911         }
912
913         return error;
914 }
915
916 void __scsi_remove_device(struct scsi_device *sdev)
917 {
918         struct device *dev = &sdev->sdev_gendev;
919
920         if (sdev->is_visible) {
921                 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
922                         return;
923
924                 bsg_unregister_queue(sdev->request_queue);
925                 device_unregister(&sdev->sdev_dev);
926                 transport_remove_device(dev);
927                 device_del(dev);
928         } else
929                 put_device(&sdev->sdev_dev);
930         scsi_device_set_state(sdev, SDEV_DEL);
931         if (sdev->host->hostt->slave_destroy)
932                 sdev->host->hostt->slave_destroy(sdev);
933         transport_destroy_device(dev);
934         put_device(dev);
935 }
936
937 /**
938  * scsi_remove_device - unregister a device from the scsi bus
939  * @sdev:       scsi_device to unregister
940  **/
941 void scsi_remove_device(struct scsi_device *sdev)
942 {
943         struct Scsi_Host *shost = sdev->host;
944
945         mutex_lock(&shost->scan_mutex);
946         __scsi_remove_device(sdev);
947         mutex_unlock(&shost->scan_mutex);
948 }
949 EXPORT_SYMBOL(scsi_remove_device);
950
951 static void __scsi_remove_target(struct scsi_target *starget)
952 {
953         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
954         unsigned long flags;
955         struct scsi_device *sdev;
956
957         spin_lock_irqsave(shost->host_lock, flags);
958         starget->reap_ref++;
959  restart:
960         list_for_each_entry(sdev, &shost->__devices, siblings) {
961                 if (sdev->channel != starget->channel ||
962                     sdev->id != starget->id ||
963                     sdev->sdev_state == SDEV_DEL)
964                         continue;
965                 spin_unlock_irqrestore(shost->host_lock, flags);
966                 scsi_remove_device(sdev);
967                 spin_lock_irqsave(shost->host_lock, flags);
968                 goto restart;
969         }
970         spin_unlock_irqrestore(shost->host_lock, flags);
971         scsi_target_reap(starget);
972 }
973
974 static int __remove_child (struct device * dev, void * data)
975 {
976         if (scsi_is_target_device(dev))
977                 __scsi_remove_target(to_scsi_target(dev));
978         return 0;
979 }
980
981 /**
982  * scsi_remove_target - try to remove a target and all its devices
983  * @dev: generic starget or parent of generic stargets to be removed
984  *
985  * Note: This is slightly racy.  It is possible that if the user
986  * requests the addition of another device then the target won't be
987  * removed.
988  */
989 void scsi_remove_target(struct device *dev)
990 {
991         struct device *rdev;
992
993         if (scsi_is_target_device(dev)) {
994                 __scsi_remove_target(to_scsi_target(dev));
995                 return;
996         }
997
998         rdev = get_device(dev);
999         device_for_each_child(dev, NULL, __remove_child);
1000         put_device(rdev);
1001 }
1002 EXPORT_SYMBOL(scsi_remove_target);
1003
1004 int scsi_register_driver(struct device_driver *drv)
1005 {
1006         drv->bus = &scsi_bus_type;
1007
1008         return driver_register(drv);
1009 }
1010 EXPORT_SYMBOL(scsi_register_driver);
1011
1012 int scsi_register_interface(struct class_interface *intf)
1013 {
1014         intf->class = &sdev_class;
1015
1016         return class_interface_register(intf);
1017 }
1018 EXPORT_SYMBOL(scsi_register_interface);
1019
1020 /**
1021  * scsi_sysfs_add_host - add scsi host to subsystem
1022  * @shost:     scsi host struct to add to subsystem
1023  **/
1024 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1025 {
1026         int error, i;
1027
1028         /* add host specific attributes */
1029         if (shost->hostt->shost_attrs) {
1030                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1031                         error = device_create_file(&shost->shost_dev,
1032                                         shost->hostt->shost_attrs[i]);
1033                         if (error)
1034                                 return error;
1035                 }
1036         }
1037
1038         transport_register_device(&shost->shost_gendev);
1039         transport_configure_device(&shost->shost_gendev);
1040         return 0;
1041 }
1042
1043 static struct device_type scsi_dev_type = {
1044         .name =         "scsi_device",
1045         .release =      scsi_device_dev_release,
1046         .groups =       scsi_sdev_attr_groups,
1047 };
1048
1049 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1050 {
1051         unsigned long flags;
1052         struct Scsi_Host *shost = sdev->host;
1053         struct scsi_target  *starget = sdev->sdev_target;
1054
1055         device_initialize(&sdev->sdev_gendev);
1056         sdev->sdev_gendev.bus = &scsi_bus_type;
1057         sdev->sdev_gendev.type = &scsi_dev_type;
1058         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%d",
1059                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1060
1061         device_initialize(&sdev->sdev_dev);
1062         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1063         sdev->sdev_dev.class = &sdev_class;
1064         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%d",
1065                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1066         sdev->scsi_level = starget->scsi_level;
1067         transport_setup_device(&sdev->sdev_gendev);
1068         spin_lock_irqsave(shost->host_lock, flags);
1069         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1070         list_add_tail(&sdev->siblings, &shost->__devices);
1071         spin_unlock_irqrestore(shost->host_lock, flags);
1072 }
1073
1074 int scsi_is_sdev_device(const struct device *dev)
1075 {
1076         return dev->type == &scsi_dev_type;
1077 }
1078 EXPORT_SYMBOL(scsi_is_sdev_device);
1079
1080 /* A blank transport template that is used in drivers that don't
1081  * yet implement Transport Attributes */
1082 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };