[SCSI] bsg: add release callback support
[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/init.h>
11 #include <linux/blkdev.h>
12 #include <linux/device.h>
13
14 #include <scsi/scsi.h>
15 #include <scsi/scsi_device.h>
16 #include <scsi/scsi_host.h>
17 #include <scsi/scsi_tcq.h>
18 #include <scsi/scsi_transport.h>
19 #include <scsi/scsi_driver.h>
20
21 #include "scsi_priv.h"
22 #include "scsi_logging.h"
23
24 static struct device_type scsi_dev_type;
25
26 static const struct {
27         enum scsi_device_state  value;
28         char                    *name;
29 } sdev_states[] = {
30         { SDEV_CREATED, "created" },
31         { SDEV_RUNNING, "running" },
32         { SDEV_CANCEL, "cancel" },
33         { SDEV_DEL, "deleted" },
34         { SDEV_QUIESCE, "quiesce" },
35         { SDEV_OFFLINE, "offline" },
36         { SDEV_BLOCK,   "blocked" },
37 };
38
39 const char *scsi_device_state_name(enum scsi_device_state state)
40 {
41         int i;
42         char *name = NULL;
43
44         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
45                 if (sdev_states[i].value == state) {
46                         name = sdev_states[i].name;
47                         break;
48                 }
49         }
50         return name;
51 }
52
53 static const struct {
54         enum scsi_host_state    value;
55         char                    *name;
56 } shost_states[] = {
57         { SHOST_CREATED, "created" },
58         { SHOST_RUNNING, "running" },
59         { SHOST_CANCEL, "cancel" },
60         { SHOST_DEL, "deleted" },
61         { SHOST_RECOVERY, "recovery" },
62         { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
63         { SHOST_DEL_RECOVERY, "deleted/recovery", },
64 };
65 const char *scsi_host_state_name(enum scsi_host_state state)
66 {
67         int i;
68         char *name = NULL;
69
70         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
71                 if (shost_states[i].value == state) {
72                         name = shost_states[i].name;
73                         break;
74                 }
75         }
76         return name;
77 }
78
79 static int check_set(unsigned int *val, char *src)
80 {
81         char *last;
82
83         if (strncmp(src, "-", 20) == 0) {
84                 *val = SCAN_WILD_CARD;
85         } else {
86                 /*
87                  * Doesn't check for int overflow
88                  */
89                 *val = simple_strtoul(src, &last, 0);
90                 if (*last != '\0')
91                         return 1;
92         }
93         return 0;
94 }
95
96 static int scsi_scan(struct Scsi_Host *shost, const char *str)
97 {
98         char s1[15], s2[15], s3[15], junk;
99         unsigned int channel, id, lun;
100         int res;
101
102         res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk);
103         if (res != 3)
104                 return -EINVAL;
105         if (check_set(&channel, s1))
106                 return -EINVAL;
107         if (check_set(&id, s2))
108                 return -EINVAL;
109         if (check_set(&lun, s3))
110                 return -EINVAL;
111         if (shost->transportt->user_scan)
112                 res = shost->transportt->user_scan(shost, channel, id, lun);
113         else
114                 res = scsi_scan_host_selected(shost, channel, id, lun, 1);
115         return res;
116 }
117
118 /*
119  * shost_show_function: macro to create an attr function that can be used to
120  * show a non-bit field.
121  */
122 #define shost_show_function(name, field, format_string)                 \
123 static ssize_t                                                          \
124 show_##name (struct device *dev, struct device_attribute *attr,         \
125              char *buf)                                                 \
126 {                                                                       \
127         struct Scsi_Host *shost = class_to_shost(dev);                  \
128         return snprintf (buf, 20, format_string, shost->field);         \
129 }
130
131 /*
132  * shost_rd_attr: macro to create a function and attribute variable for a
133  * read only field.
134  */
135 #define shost_rd_attr2(name, field, format_string)                      \
136         shost_show_function(name, field, format_string)                 \
137 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
138
139 #define shost_rd_attr(field, format_string) \
140 shost_rd_attr2(field, field, format_string)
141
142 /*
143  * Create the actual show/store functions and data structures.
144  */
145
146 static ssize_t
147 store_scan(struct device *dev, struct device_attribute *attr,
148            const char *buf, size_t count)
149 {
150         struct Scsi_Host *shost = class_to_shost(dev);
151         int res;
152
153         res = scsi_scan(shost, buf);
154         if (res == 0)
155                 res = count;
156         return res;
157 };
158 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
159
160 static ssize_t
161 store_shost_state(struct device *dev, struct device_attribute *attr,
162                   const char *buf, size_t count)
163 {
164         int i;
165         struct Scsi_Host *shost = class_to_shost(dev);
166         enum scsi_host_state state = 0;
167
168         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
169                 const int len = strlen(shost_states[i].name);
170                 if (strncmp(shost_states[i].name, buf, len) == 0 &&
171                    buf[len] == '\n') {
172                         state = shost_states[i].value;
173                         break;
174                 }
175         }
176         if (!state)
177                 return -EINVAL;
178
179         if (scsi_host_set_state(shost, state))
180                 return -EINVAL;
181         return count;
182 }
183
184 static ssize_t
185 show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
186 {
187         struct Scsi_Host *shost = class_to_shost(dev);
188         const char *name = scsi_host_state_name(shost->shost_state);
189
190         if (!name)
191                 return -EINVAL;
192
193         return snprintf(buf, 20, "%s\n", name);
194 }
195
196 /* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
197 struct device_attribute dev_attr_hstate =
198         __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
199
200 static ssize_t
201 show_shost_mode(unsigned int mode, char *buf)
202 {
203         ssize_t len = 0;
204
205         if (mode & MODE_INITIATOR)
206                 len = sprintf(buf, "%s", "Initiator");
207
208         if (mode & MODE_TARGET)
209                 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
210
211         len += sprintf(buf + len, "\n");
212
213         return len;
214 }
215
216 static ssize_t
217 show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
218                           char *buf)
219 {
220         struct Scsi_Host *shost = class_to_shost(dev);
221         unsigned int supported_mode = shost->hostt->supported_mode;
222
223         if (supported_mode == MODE_UNKNOWN)
224                 /* by default this should be initiator */
225                 supported_mode = MODE_INITIATOR;
226
227         return show_shost_mode(supported_mode, buf);
228 }
229
230 static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
231
232 static ssize_t
233 show_shost_active_mode(struct device *dev,
234                        struct device_attribute *attr, char *buf)
235 {
236         struct Scsi_Host *shost = class_to_shost(dev);
237
238         if (shost->active_mode == MODE_UNKNOWN)
239                 return snprintf(buf, 20, "unknown\n");
240         else
241                 return show_shost_mode(shost->active_mode, buf);
242 }
243
244 static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
245
246 shost_rd_attr(unique_id, "%u\n");
247 shost_rd_attr(host_busy, "%hu\n");
248 shost_rd_attr(cmd_per_lun, "%hd\n");
249 shost_rd_attr(can_queue, "%hd\n");
250 shost_rd_attr(sg_tablesize, "%hu\n");
251 shost_rd_attr(unchecked_isa_dma, "%d\n");
252 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
253
254 static struct attribute *scsi_sysfs_shost_attrs[] = {
255         &dev_attr_unique_id.attr,
256         &dev_attr_host_busy.attr,
257         &dev_attr_cmd_per_lun.attr,
258         &dev_attr_can_queue.attr,
259         &dev_attr_sg_tablesize.attr,
260         &dev_attr_unchecked_isa_dma.attr,
261         &dev_attr_proc_name.attr,
262         &dev_attr_scan.attr,
263         &dev_attr_hstate.attr,
264         &dev_attr_supported_mode.attr,
265         &dev_attr_active_mode.attr,
266         NULL
267 };
268
269 struct attribute_group scsi_shost_attr_group = {
270         .attrs =        scsi_sysfs_shost_attrs,
271 };
272
273 struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
274         &scsi_shost_attr_group,
275         NULL
276 };
277
278 static void scsi_device_cls_release(struct device *class_dev)
279 {
280         struct scsi_device *sdev;
281
282         sdev = class_to_sdev(class_dev);
283         put_device(&sdev->sdev_gendev);
284 }
285
286 static void scsi_device_dev_release_usercontext(struct work_struct *work)
287 {
288         struct scsi_device *sdev;
289         struct device *parent;
290         struct scsi_target *starget;
291         struct list_head *this, *tmp;
292         unsigned long flags;
293
294         sdev = container_of(work, struct scsi_device, ew.work);
295
296         parent = sdev->sdev_gendev.parent;
297         starget = to_scsi_target(parent);
298
299         spin_lock_irqsave(sdev->host->host_lock, flags);
300         starget->reap_ref++;
301         list_del(&sdev->siblings);
302         list_del(&sdev->same_target_siblings);
303         list_del(&sdev->starved_entry);
304         spin_unlock_irqrestore(sdev->host->host_lock, flags);
305
306         cancel_work_sync(&sdev->event_work);
307
308         list_for_each_safe(this, tmp, &sdev->event_list) {
309                 struct scsi_event *evt;
310
311                 evt = list_entry(this, struct scsi_event, node);
312                 list_del(&evt->node);
313                 kfree(evt);
314         }
315
316         if (sdev->request_queue) {
317                 sdev->request_queue->queuedata = NULL;
318                 /* user context needed to free queue */
319                 scsi_free_queue(sdev->request_queue);
320                 /* temporary expedient, try to catch use of queue lock
321                  * after free of sdev */
322                 sdev->request_queue = NULL;
323         }
324
325         scsi_target_reap(scsi_target(sdev));
326
327         kfree(sdev->inquiry);
328         kfree(sdev);
329
330         if (parent)
331                 put_device(parent);
332 }
333
334 static void scsi_device_dev_release(struct device *dev)
335 {
336         struct scsi_device *sdp = to_scsi_device(dev);
337         execute_in_process_context(scsi_device_dev_release_usercontext,
338                                    &sdp->ew);
339 }
340
341 static struct class sdev_class = {
342         .name           = "scsi_device",
343         .dev_release    = scsi_device_cls_release,
344 };
345
346 /* all probing is done in the individual ->probe routines */
347 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
348 {
349         struct scsi_device *sdp;
350
351         if (dev->type != &scsi_dev_type)
352                 return 0;
353
354         sdp = to_scsi_device(dev);
355         if (sdp->no_uld_attach)
356                 return 0;
357         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
358 }
359
360 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
361 {
362         struct scsi_device *sdev = to_scsi_device(dev);
363
364         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
365         return 0;
366 }
367
368 static int scsi_bus_suspend(struct device * dev, pm_message_t state)
369 {
370         struct device_driver *drv;
371         struct scsi_device *sdev;
372         int err;
373
374         if (dev->type != &scsi_dev_type)
375                 return 0;
376
377         drv = dev->driver;
378         sdev = to_scsi_device(dev);
379
380         err = scsi_device_quiesce(sdev);
381         if (err)
382                 return err;
383
384         if (drv && drv->suspend) {
385                 err = drv->suspend(dev, state);
386                 if (err)
387                         return err;
388         }
389
390         return 0;
391 }
392
393 static int scsi_bus_resume(struct device * dev)
394 {
395         struct device_driver *drv;
396         struct scsi_device *sdev;
397         int err = 0;
398
399         if (dev->type != &scsi_dev_type)
400                 return 0;
401
402         drv = dev->driver;
403         sdev = to_scsi_device(dev);
404
405         if (drv && drv->resume)
406                 err = drv->resume(dev);
407
408         scsi_device_resume(sdev);
409
410         return err;
411 }
412
413 static int scsi_bus_remove(struct device *dev)
414 {
415         struct device_driver *drv = dev->driver;
416         struct scsi_device *sdev = to_scsi_device(dev);
417         int err = 0;
418
419         /* reset the prep_fn back to the default since the
420          * driver may have altered it and it's being removed */
421         blk_queue_prep_rq(sdev->request_queue, scsi_prep_fn);
422
423         if (drv && drv->remove)
424                 err = drv->remove(dev);
425
426         return 0;
427 }
428
429 struct bus_type scsi_bus_type = {
430         .name           = "scsi",
431         .match          = scsi_bus_match,
432         .uevent         = scsi_bus_uevent,
433         .suspend        = scsi_bus_suspend,
434         .resume         = scsi_bus_resume,
435         .remove         = scsi_bus_remove,
436 };
437
438 int scsi_sysfs_register(void)
439 {
440         int error;
441
442         error = bus_register(&scsi_bus_type);
443         if (!error) {
444                 error = class_register(&sdev_class);
445                 if (error)
446                         bus_unregister(&scsi_bus_type);
447         }
448
449         return error;
450 }
451
452 void scsi_sysfs_unregister(void)
453 {
454         class_unregister(&sdev_class);
455         bus_unregister(&scsi_bus_type);
456 }
457
458 /*
459  * sdev_show_function: macro to create an attr function that can be used to
460  * show a non-bit field.
461  */
462 #define sdev_show_function(field, format_string)                                \
463 static ssize_t                                                          \
464 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
465                    char *buf)                                           \
466 {                                                                       \
467         struct scsi_device *sdev;                                       \
468         sdev = to_scsi_device(dev);                                     \
469         return snprintf (buf, 20, format_string, sdev->field);          \
470 }                                                                       \
471
472 /*
473  * sdev_rd_attr: macro to create a function and attribute variable for a
474  * read only field.
475  */
476 #define sdev_rd_attr(field, format_string)                              \
477         sdev_show_function(field, format_string)                        \
478 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
479
480
481 /*
482  * sdev_rd_attr: create a function and attribute variable for a
483  * read/write field.
484  */
485 #define sdev_rw_attr(field, format_string)                              \
486         sdev_show_function(field, format_string)                                \
487                                                                         \
488 static ssize_t                                                          \
489 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
490                     const char *buf, size_t count)                      \
491 {                                                                       \
492         struct scsi_device *sdev;                                       \
493         sdev = to_scsi_device(dev);                                     \
494         snscanf (buf, 20, format_string, &sdev->field);                 \
495         return count;                                                   \
496 }                                                                       \
497 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
498
499 /* Currently we don't export bit fields, but we might in future,
500  * so leave this code in */
501 #if 0
502 /*
503  * sdev_rd_attr: create a function and attribute variable for a
504  * read/write bit field.
505  */
506 #define sdev_rw_attr_bit(field)                                         \
507         sdev_show_function(field, "%d\n")                                       \
508                                                                         \
509 static ssize_t                                                          \
510 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
511                     const char *buf, size_t count)                      \
512 {                                                                       \
513         int ret;                                                        \
514         struct scsi_device *sdev;                                       \
515         ret = scsi_sdev_check_buf_bit(buf);                             \
516         if (ret >= 0)   {                                               \
517                 sdev = to_scsi_device(dev);                             \
518                 sdev->field = ret;                                      \
519                 ret = count;                                            \
520         }                                                               \
521         return ret;                                                     \
522 }                                                                       \
523 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
524
525 /*
526  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
527  * else return -EINVAL.
528  */
529 static int scsi_sdev_check_buf_bit(const char *buf)
530 {
531         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
532                 if (buf[0] == '1')
533                         return 1;
534                 else if (buf[0] == '0')
535                         return 0;
536                 else 
537                         return -EINVAL;
538         } else
539                 return -EINVAL;
540 }
541 #endif
542 /*
543  * Create the actual show/store functions and data structures.
544  */
545 sdev_rd_attr (device_blocked, "%d\n");
546 sdev_rd_attr (queue_depth, "%d\n");
547 sdev_rd_attr (type, "%d\n");
548 sdev_rd_attr (scsi_level, "%d\n");
549 sdev_rd_attr (vendor, "%.8s\n");
550 sdev_rd_attr (model, "%.16s\n");
551 sdev_rd_attr (rev, "%.4s\n");
552
553 static ssize_t
554 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
555 {
556         struct scsi_device *sdev;
557         sdev = to_scsi_device(dev);
558         return snprintf (buf, 20, "%d\n", sdev->timeout / HZ);
559 }
560
561 static ssize_t
562 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
563                     const char *buf, size_t count)
564 {
565         struct scsi_device *sdev;
566         int timeout;
567         sdev = to_scsi_device(dev);
568         sscanf (buf, "%d\n", &timeout);
569         sdev->timeout = timeout * HZ;
570         return count;
571 }
572 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
573
574 static ssize_t
575 store_rescan_field (struct device *dev, struct device_attribute *attr,
576                     const char *buf, size_t count)
577 {
578         scsi_rescan_device(dev);
579         return count;
580 }
581 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
582
583 static void sdev_store_delete_callback(struct device *dev)
584 {
585         scsi_remove_device(to_scsi_device(dev));
586 }
587
588 static ssize_t
589 sdev_store_delete(struct device *dev, struct device_attribute *attr,
590                   const char *buf, size_t count)
591 {
592         int rc;
593
594         /* An attribute cannot be unregistered by one of its own methods,
595          * so we have to use this roundabout approach.
596          */
597         rc = device_schedule_callback(dev, sdev_store_delete_callback);
598         if (rc)
599                 count = rc;
600         return count;
601 };
602 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
603
604 static ssize_t
605 store_state_field(struct device *dev, struct device_attribute *attr,
606                   const char *buf, size_t count)
607 {
608         int i;
609         struct scsi_device *sdev = to_scsi_device(dev);
610         enum scsi_device_state state = 0;
611
612         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
613                 const int len = strlen(sdev_states[i].name);
614                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
615                    buf[len] == '\n') {
616                         state = sdev_states[i].value;
617                         break;
618                 }
619         }
620         if (!state)
621                 return -EINVAL;
622
623         if (scsi_device_set_state(sdev, state))
624                 return -EINVAL;
625         return count;
626 }
627
628 static ssize_t
629 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
630 {
631         struct scsi_device *sdev = to_scsi_device(dev);
632         const char *name = scsi_device_state_name(sdev->sdev_state);
633
634         if (!name)
635                 return -EINVAL;
636
637         return snprintf(buf, 20, "%s\n", name);
638 }
639
640 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
641
642 static ssize_t
643 show_queue_type_field(struct device *dev, struct device_attribute *attr,
644                       char *buf)
645 {
646         struct scsi_device *sdev = to_scsi_device(dev);
647         const char *name = "none";
648
649         if (sdev->ordered_tags)
650                 name = "ordered";
651         else if (sdev->simple_tags)
652                 name = "simple";
653
654         return snprintf(buf, 20, "%s\n", name);
655 }
656
657 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
658
659 static ssize_t
660 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,                              char *buf)
661 {
662         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
663 }
664
665 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
666
667 #define show_sdev_iostat(field)                                         \
668 static ssize_t                                                          \
669 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
670                     char *buf)                                          \
671 {                                                                       \
672         struct scsi_device *sdev = to_scsi_device(dev);                 \
673         unsigned long long count = atomic_read(&sdev->field);           \
674         return snprintf(buf, 20, "0x%llx\n", count);                    \
675 }                                                                       \
676 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
677
678 show_sdev_iostat(iorequest_cnt);
679 show_sdev_iostat(iodone_cnt);
680 show_sdev_iostat(ioerr_cnt);
681
682 static ssize_t
683 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
684 {
685         struct scsi_device *sdev;
686         sdev = to_scsi_device(dev);
687         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
688 }
689 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
690
691 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
692 static ssize_t                                                          \
693 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
694                      char *buf)                                         \
695 {                                                                       \
696         struct scsi_device *sdev = to_scsi_device(dev);                 \
697         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
698         return snprintf(buf, 20, "%d\n", val);                          \
699 }
700
701 #define DECLARE_EVT_STORE(name, Cap_name)                               \
702 static ssize_t                                                          \
703 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
704                       const char *buf, size_t count)                    \
705 {                                                                       \
706         struct scsi_device *sdev = to_scsi_device(dev);                 \
707         int val = simple_strtoul(buf, NULL, 0);                         \
708         if (val == 0)                                                   \
709                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
710         else if (val == 1)                                              \
711                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
712         else                                                            \
713                 return -EINVAL;                                         \
714         return count;                                                   \
715 }
716
717 #define DECLARE_EVT(name, Cap_name)                                     \
718         DECLARE_EVT_SHOW(name, Cap_name)                                \
719         DECLARE_EVT_STORE(name, Cap_name)                               \
720         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
721                            sdev_store_evt_##name);
722 #define REF_EVT(name) &dev_attr_evt_##name.attr
723
724 DECLARE_EVT(media_change, MEDIA_CHANGE)
725
726 /* Default template for device attributes.  May NOT be modified */
727 static struct attribute *scsi_sdev_attrs[] = {
728         &dev_attr_device_blocked.attr,
729         &dev_attr_type.attr,
730         &dev_attr_scsi_level.attr,
731         &dev_attr_vendor.attr,
732         &dev_attr_model.attr,
733         &dev_attr_rev.attr,
734         &dev_attr_rescan.attr,
735         &dev_attr_delete.attr,
736         &dev_attr_state.attr,
737         &dev_attr_timeout.attr,
738         &dev_attr_iocounterbits.attr,
739         &dev_attr_iorequest_cnt.attr,
740         &dev_attr_iodone_cnt.attr,
741         &dev_attr_ioerr_cnt.attr,
742         &dev_attr_modalias.attr,
743         REF_EVT(media_change),
744         NULL
745 };
746
747 static struct attribute_group scsi_sdev_attr_group = {
748         .attrs =        scsi_sdev_attrs,
749 };
750
751 static struct attribute_group *scsi_sdev_attr_groups[] = {
752         &scsi_sdev_attr_group,
753         NULL
754 };
755
756 static ssize_t
757 sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
758                           const char *buf, size_t count)
759 {
760         int depth, retval;
761         struct scsi_device *sdev = to_scsi_device(dev);
762         struct scsi_host_template *sht = sdev->host->hostt;
763
764         if (!sht->change_queue_depth)
765                 return -EINVAL;
766
767         depth = simple_strtoul(buf, NULL, 0);
768
769         if (depth < 1)
770                 return -EINVAL;
771
772         retval = sht->change_queue_depth(sdev, depth);
773         if (retval < 0)
774                 return retval;
775
776         return count;
777 }
778
779 static struct device_attribute sdev_attr_queue_depth_rw =
780         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
781                sdev_store_queue_depth_rw);
782
783 static ssize_t
784 sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
785                          const char *buf, size_t count)
786 {
787         struct scsi_device *sdev = to_scsi_device(dev);
788         struct scsi_host_template *sht = sdev->host->hostt;
789         int tag_type = 0, retval;
790         int prev_tag_type = scsi_get_tag_type(sdev);
791
792         if (!sdev->tagged_supported || !sht->change_queue_type)
793                 return -EINVAL;
794
795         if (strncmp(buf, "ordered", 7) == 0)
796                 tag_type = MSG_ORDERED_TAG;
797         else if (strncmp(buf, "simple", 6) == 0)
798                 tag_type = MSG_SIMPLE_TAG;
799         else if (strncmp(buf, "none", 4) != 0)
800                 return -EINVAL;
801
802         if (tag_type == prev_tag_type)
803                 return count;
804
805         retval = sht->change_queue_type(sdev, tag_type);
806         if (retval < 0)
807                 return retval;
808
809         return count;
810 }
811
812 static int scsi_target_add(struct scsi_target *starget)
813 {
814         int error;
815
816         if (starget->state != STARGET_CREATED)
817                 return 0;
818
819         error = device_add(&starget->dev);
820         if (error) {
821                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
822                 get_device(&starget->dev);
823                 scsi_target_reap(starget);
824                 put_device(&starget->dev);
825                 return error;
826         }
827         transport_add_device(&starget->dev);
828         starget->state = STARGET_RUNNING;
829
830         return 0;
831 }
832
833 static struct device_attribute sdev_attr_queue_type_rw =
834         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
835                sdev_store_queue_type_rw);
836
837 /**
838  * scsi_sysfs_add_sdev - add scsi device to sysfs
839  * @sdev:       scsi_device to add
840  *
841  * Return value:
842  *      0 on Success / non-zero on Failure
843  **/
844 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
845 {
846         int error, i;
847         struct request_queue *rq = sdev->request_queue;
848         struct scsi_target *starget = sdev->sdev_target;
849
850         if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0)
851                 return error;
852
853         error = scsi_target_add(starget);
854         if (error)
855                 return error;
856
857         transport_configure_device(&starget->dev);
858         error = device_add(&sdev->sdev_gendev);
859         if (error) {
860                 put_device(sdev->sdev_gendev.parent);
861                 printk(KERN_INFO "error 1\n");
862                 return error;
863         }
864         error = device_add(&sdev->sdev_dev);
865         if (error) {
866                 printk(KERN_INFO "error 2\n");
867                 goto clean_device;
868         }
869
870         /* take a reference for the sdev_dev; this is
871          * released by the sdev_class .release */
872         get_device(&sdev->sdev_gendev);
873
874         /* create queue files, which may be writable, depending on the host */
875         if (sdev->host->hostt->change_queue_depth)
876                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_depth_rw);
877         else
878                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
879         if (error) {
880                 __scsi_remove_device(sdev);
881                 goto out;
882         }
883         if (sdev->host->hostt->change_queue_type)
884                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
885         else
886                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
887         if (error) {
888                 __scsi_remove_device(sdev);
889                 goto out;
890         }
891
892         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
893
894         if (error)
895                 sdev_printk(KERN_INFO, sdev,
896                             "Failed to register bsg queue, errno=%d\n", error);
897
898         /* we're treating error on bsg register as non-fatal, so pretend
899          * nothing went wrong */
900         error = 0;
901
902         /* add additional host specific attributes */
903         if (sdev->host->hostt->sdev_attrs) {
904                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
905                         error = device_create_file(&sdev->sdev_gendev,
906                                         sdev->host->hostt->sdev_attrs[i]);
907                         if (error) {
908                                 __scsi_remove_device(sdev);
909                                 goto out;
910                         }
911                 }
912         }
913
914         transport_add_device(&sdev->sdev_gendev);
915  out:
916         return error;
917
918  clean_device:
919         scsi_device_set_state(sdev, SDEV_CANCEL);
920
921         device_del(&sdev->sdev_gendev);
922         transport_destroy_device(&sdev->sdev_gendev);
923         put_device(&sdev->sdev_gendev);
924
925         return error;
926 }
927
928 void __scsi_remove_device(struct scsi_device *sdev)
929 {
930         struct device *dev = &sdev->sdev_gendev;
931
932         if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
933                 return;
934
935         bsg_unregister_queue(sdev->request_queue);
936         device_unregister(&sdev->sdev_dev);
937         transport_remove_device(dev);
938         device_del(dev);
939         scsi_device_set_state(sdev, SDEV_DEL);
940         if (sdev->host->hostt->slave_destroy)
941                 sdev->host->hostt->slave_destroy(sdev);
942         transport_destroy_device(dev);
943         put_device(dev);
944 }
945
946 /**
947  * scsi_remove_device - unregister a device from the scsi bus
948  * @sdev:       scsi_device to unregister
949  **/
950 void scsi_remove_device(struct scsi_device *sdev)
951 {
952         struct Scsi_Host *shost = sdev->host;
953
954         mutex_lock(&shost->scan_mutex);
955         __scsi_remove_device(sdev);
956         mutex_unlock(&shost->scan_mutex);
957 }
958 EXPORT_SYMBOL(scsi_remove_device);
959
960 static void __scsi_remove_target(struct scsi_target *starget)
961 {
962         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
963         unsigned long flags;
964         struct scsi_device *sdev;
965
966         spin_lock_irqsave(shost->host_lock, flags);
967         starget->reap_ref++;
968  restart:
969         list_for_each_entry(sdev, &shost->__devices, siblings) {
970                 if (sdev->channel != starget->channel ||
971                     sdev->id != starget->id ||
972                     sdev->sdev_state == SDEV_DEL)
973                         continue;
974                 spin_unlock_irqrestore(shost->host_lock, flags);
975                 scsi_remove_device(sdev);
976                 spin_lock_irqsave(shost->host_lock, flags);
977                 goto restart;
978         }
979         spin_unlock_irqrestore(shost->host_lock, flags);
980         scsi_target_reap(starget);
981 }
982
983 static int __remove_child (struct device * dev, void * data)
984 {
985         if (scsi_is_target_device(dev))
986                 __scsi_remove_target(to_scsi_target(dev));
987         return 0;
988 }
989
990 /**
991  * scsi_remove_target - try to remove a target and all its devices
992  * @dev: generic starget or parent of generic stargets to be removed
993  *
994  * Note: This is slightly racy.  It is possible that if the user
995  * requests the addition of another device then the target won't be
996  * removed.
997  */
998 void scsi_remove_target(struct device *dev)
999 {
1000         struct device *rdev;
1001
1002         if (scsi_is_target_device(dev)) {
1003                 __scsi_remove_target(to_scsi_target(dev));
1004                 return;
1005         }
1006
1007         rdev = get_device(dev);
1008         device_for_each_child(dev, NULL, __remove_child);
1009         put_device(rdev);
1010 }
1011 EXPORT_SYMBOL(scsi_remove_target);
1012
1013 int scsi_register_driver(struct device_driver *drv)
1014 {
1015         drv->bus = &scsi_bus_type;
1016
1017         return driver_register(drv);
1018 }
1019 EXPORT_SYMBOL(scsi_register_driver);
1020
1021 int scsi_register_interface(struct class_interface *intf)
1022 {
1023         intf->class = &sdev_class;
1024
1025         return class_interface_register(intf);
1026 }
1027 EXPORT_SYMBOL(scsi_register_interface);
1028
1029 /**
1030  * scsi_sysfs_add_host - add scsi host to subsystem
1031  * @shost:     scsi host struct to add to subsystem
1032  * @dev:       parent struct device pointer
1033  **/
1034 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1035 {
1036         int error, i;
1037
1038         /* add host specific attributes */
1039         if (shost->hostt->shost_attrs) {
1040                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1041                         error = device_create_file(&shost->shost_dev,
1042                                         shost->hostt->shost_attrs[i]);
1043                         if (error)
1044                                 return error;
1045                 }
1046         }
1047
1048         transport_register_device(&shost->shost_gendev);
1049         transport_configure_device(&shost->shost_gendev);
1050         return 0;
1051 }
1052
1053 static struct device_type scsi_dev_type = {
1054         .name =         "scsi_device",
1055         .release =      scsi_device_dev_release,
1056         .groups =       scsi_sdev_attr_groups,
1057 };
1058
1059 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1060 {
1061         unsigned long flags;
1062         struct Scsi_Host *shost = sdev->host;
1063         struct scsi_target  *starget = sdev->sdev_target;
1064
1065         device_initialize(&sdev->sdev_gendev);
1066         sdev->sdev_gendev.bus = &scsi_bus_type;
1067         sdev->sdev_gendev.type = &scsi_dev_type;
1068         sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d",
1069                 sdev->host->host_no, sdev->channel, sdev->id,
1070                 sdev->lun);
1071         
1072         device_initialize(&sdev->sdev_dev);
1073         sdev->sdev_dev.parent = &sdev->sdev_gendev;
1074         sdev->sdev_dev.class = &sdev_class;
1075         snprintf(sdev->sdev_dev.bus_id, BUS_ID_SIZE,
1076                  "%d:%d:%d:%d", sdev->host->host_no,
1077                  sdev->channel, sdev->id, sdev->lun);
1078         sdev->scsi_level = starget->scsi_level;
1079         transport_setup_device(&sdev->sdev_gendev);
1080         spin_lock_irqsave(shost->host_lock, flags);
1081         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1082         list_add_tail(&sdev->siblings, &shost->__devices);
1083         spin_unlock_irqrestore(shost->host_lock, flags);
1084 }
1085
1086 int scsi_is_sdev_device(const struct device *dev)
1087 {
1088         return dev->type == &scsi_dev_type;
1089 }
1090 EXPORT_SYMBOL(scsi_is_sdev_device);
1091
1092 /* A blank transport template that is used in drivers that don't
1093  * yet implement Transport Attributes */
1094 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };