[SCSI] megaraid_sas: Fix FastPath I/O to work on degraded raid 1
[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         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
338 static 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
345 static 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 */
351 static 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
364 static 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
377 struct 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 };
385 EXPORT_SYMBOL_GPL(scsi_bus_type);
386
387 int 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
401 void 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)                                \
412 static ssize_t                                                          \
413 sdev_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)                        \
427 static 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                                                                         \
437 static ssize_t                                                          \
438 sdev_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 }                                                                       \
446 static 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                                                                         \
458 static ssize_t                                                          \
459 sdev_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 }                                                                       \
472 static 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  */
478 static 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  */
494 sdev_rd_attr (device_blocked, "%d\n");
495 sdev_rd_attr (queue_depth, "%d\n");
496 sdev_rd_attr (type, "%d\n");
497 sdev_rd_attr (scsi_level, "%d\n");
498 sdev_rd_attr (vendor, "%.8s\n");
499 sdev_rd_attr (model, "%.16s\n");
500 sdev_rd_attr (rev, "%.4s\n");
501
502 /*
503  * TODO: can we make these symlinks to the block layer ones?
504  */
505 static ssize_t
506 sdev_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
513 static ssize_t
514 sdev_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 }
524 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
525
526 static ssize_t
527 store_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 }
533 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
534
535 static void sdev_store_delete_callback(struct device *dev)
536 {
537         scsi_remove_device(to_scsi_device(dev));
538 }
539
540 static ssize_t
541 sdev_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 };
554 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
555
556 static ssize_t
557 store_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
580 static ssize_t
581 show_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
592 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
593
594 static ssize_t
595 show_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
609 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
610
611 static ssize_t
612 show_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
617 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
618
619 #define show_sdev_iostat(field)                                         \
620 static ssize_t                                                          \
621 show_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 }                                                                       \
628 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
629
630 show_sdev_iostat(iorequest_cnt);
631 show_sdev_iostat(iodone_cnt);
632 show_sdev_iostat(ioerr_cnt);
633
634 static ssize_t
635 sdev_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 }
641 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
642
643 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
644 static ssize_t                                                          \
645 sdev_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)                               \
654 static ssize_t                                                          \
655 sdev_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
676 DECLARE_EVT(media_change, MEDIA_CHANGE)
677
678 /* Default template for device attributes.  May NOT be modified */
679 static 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
699 static struct attribute_group scsi_sdev_attr_group = {
700         .attrs =        scsi_sdev_attrs,
701 };
702
703 static const struct attribute_group *scsi_sdev_attr_groups[] = {
704         &scsi_sdev_attr_group,
705         NULL
706 };
707
708 static ssize_t
709 sdev_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
734 static 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
738 static ssize_t
739 sdev_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
749 static ssize_t
750 sdev_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
764 static 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
769 static ssize_t
770 sdev_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
798 static 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
820 static 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  **/
831 int 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
917 void __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  **/
948 void 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 }
956 EXPORT_SYMBOL(scsi_remove_device);
957
958 static 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
982 static 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  */
997 void 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 }
1008 EXPORT_SYMBOL(scsi_remove_target);
1009
1010 int scsi_register_driver(struct device_driver *drv)
1011 {
1012         drv->bus = &scsi_bus_type;
1013
1014         return driver_register(drv);
1015 }
1016 EXPORT_SYMBOL(scsi_register_driver);
1017
1018 int scsi_register_interface(struct class_interface *intf)
1019 {
1020         intf->class = &sdev_class;
1021
1022         return class_interface_register(intf);
1023 }
1024 EXPORT_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  **/
1030 int 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
1049 static struct device_type scsi_dev_type = {
1050         .name =         "scsi_device",
1051         .release =      scsi_device_dev_release,
1052         .groups =       scsi_sdev_attr_groups,
1053 };
1054
1055 void 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
1080 int scsi_is_sdev_device(const struct device *dev)
1081 {
1082         return dev->type == &scsi_dev_type;
1083 }
1084 EXPORT_SYMBOL(scsi_is_sdev_device);
1085
1086 /* A blank transport template that is used in drivers that don't
1087  * yet implement Transport Attributes */
1088 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };