block: unify request timeout handling
[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_attr(prot_capabilities, "%u\n");
253 shost_rd_attr(prot_guard_type, "%hd\n");
254 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
255
256 static struct attribute *scsi_sysfs_shost_attrs[] = {
257         &dev_attr_unique_id.attr,
258         &dev_attr_host_busy.attr,
259         &dev_attr_cmd_per_lun.attr,
260         &dev_attr_can_queue.attr,
261         &dev_attr_sg_tablesize.attr,
262         &dev_attr_unchecked_isa_dma.attr,
263         &dev_attr_proc_name.attr,
264         &dev_attr_scan.attr,
265         &dev_attr_hstate.attr,
266         &dev_attr_supported_mode.attr,
267         &dev_attr_active_mode.attr,
268         &dev_attr_prot_capabilities.attr,
269         &dev_attr_prot_guard_type.attr,
270         NULL
271 };
272
273 struct attribute_group scsi_shost_attr_group = {
274         .attrs =        scsi_sysfs_shost_attrs,
275 };
276
277 struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
278         &scsi_shost_attr_group,
279         NULL
280 };
281
282 static void scsi_device_cls_release(struct device *class_dev)
283 {
284         struct scsi_device *sdev;
285
286         sdev = class_to_sdev(class_dev);
287         put_device(&sdev->sdev_gendev);
288 }
289
290 static void scsi_device_dev_release_usercontext(struct work_struct *work)
291 {
292         struct scsi_device *sdev;
293         struct device *parent;
294         struct scsi_target *starget;
295         struct list_head *this, *tmp;
296         unsigned long flags;
297
298         sdev = container_of(work, struct scsi_device, ew.work);
299
300         parent = sdev->sdev_gendev.parent;
301         starget = to_scsi_target(parent);
302
303         spin_lock_irqsave(sdev->host->host_lock, flags);
304         starget->reap_ref++;
305         list_del(&sdev->siblings);
306         list_del(&sdev->same_target_siblings);
307         list_del(&sdev->starved_entry);
308         spin_unlock_irqrestore(sdev->host->host_lock, flags);
309
310         cancel_work_sync(&sdev->event_work);
311
312         list_for_each_safe(this, tmp, &sdev->event_list) {
313                 struct scsi_event *evt;
314
315                 evt = list_entry(this, struct scsi_event, node);
316                 list_del(&evt->node);
317                 kfree(evt);
318         }
319
320         if (sdev->request_queue) {
321                 sdev->request_queue->queuedata = NULL;
322                 /* user context needed to free queue */
323                 scsi_free_queue(sdev->request_queue);
324                 /* temporary expedient, try to catch use of queue lock
325                  * after free of sdev */
326                 sdev->request_queue = NULL;
327         }
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 static int scsi_bus_suspend(struct device * dev, pm_message_t state)
378 {
379         struct device_driver *drv;
380         struct scsi_device *sdev;
381         int err;
382
383         if (dev->type != &scsi_dev_type)
384                 return 0;
385
386         drv = dev->driver;
387         sdev = to_scsi_device(dev);
388
389         err = scsi_device_quiesce(sdev);
390         if (err)
391                 return err;
392
393         if (drv && drv->suspend) {
394                 err = drv->suspend(dev, state);
395                 if (err)
396                         return err;
397         }
398
399         return 0;
400 }
401
402 static int scsi_bus_resume(struct device * dev)
403 {
404         struct device_driver *drv;
405         struct scsi_device *sdev;
406         int err = 0;
407
408         if (dev->type != &scsi_dev_type)
409                 return 0;
410
411         drv = dev->driver;
412         sdev = to_scsi_device(dev);
413
414         if (drv && drv->resume)
415                 err = drv->resume(dev);
416
417         scsi_device_resume(sdev);
418
419         return err;
420 }
421
422 static int scsi_bus_remove(struct device *dev)
423 {
424         struct device_driver *drv = dev->driver;
425         struct scsi_device *sdev = to_scsi_device(dev);
426         int err = 0;
427
428         /* reset the prep_fn back to the default since the
429          * driver may have altered it and it's being removed */
430         blk_queue_prep_rq(sdev->request_queue, scsi_prep_fn);
431
432         if (drv && drv->remove)
433                 err = drv->remove(dev);
434
435         return 0;
436 }
437
438 struct bus_type scsi_bus_type = {
439         .name           = "scsi",
440         .match          = scsi_bus_match,
441         .uevent         = scsi_bus_uevent,
442         .suspend        = scsi_bus_suspend,
443         .resume         = scsi_bus_resume,
444         .remove         = scsi_bus_remove,
445 };
446 EXPORT_SYMBOL_GPL(scsi_bus_type);
447
448 int scsi_sysfs_register(void)
449 {
450         int error;
451
452         error = bus_register(&scsi_bus_type);
453         if (!error) {
454                 error = class_register(&sdev_class);
455                 if (error)
456                         bus_unregister(&scsi_bus_type);
457         }
458
459         return error;
460 }
461
462 void scsi_sysfs_unregister(void)
463 {
464         class_unregister(&sdev_class);
465         bus_unregister(&scsi_bus_type);
466 }
467
468 /*
469  * sdev_show_function: macro to create an attr function that can be used to
470  * show a non-bit field.
471  */
472 #define sdev_show_function(field, format_string)                                \
473 static ssize_t                                                          \
474 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
475                    char *buf)                                           \
476 {                                                                       \
477         struct scsi_device *sdev;                                       \
478         sdev = to_scsi_device(dev);                                     \
479         return snprintf (buf, 20, format_string, sdev->field);          \
480 }                                                                       \
481
482 /*
483  * sdev_rd_attr: macro to create a function and attribute variable for a
484  * read only field.
485  */
486 #define sdev_rd_attr(field, format_string)                              \
487         sdev_show_function(field, format_string)                        \
488 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
489
490
491 /*
492  * sdev_rd_attr: create a function and attribute variable for a
493  * read/write field.
494  */
495 #define sdev_rw_attr(field, format_string)                              \
496         sdev_show_function(field, format_string)                                \
497                                                                         \
498 static ssize_t                                                          \
499 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
500                     const char *buf, size_t count)                      \
501 {                                                                       \
502         struct scsi_device *sdev;                                       \
503         sdev = to_scsi_device(dev);                                     \
504         snscanf (buf, 20, format_string, &sdev->field);                 \
505         return count;                                                   \
506 }                                                                       \
507 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
508
509 /* Currently we don't export bit fields, but we might in future,
510  * so leave this code in */
511 #if 0
512 /*
513  * sdev_rd_attr: create a function and attribute variable for a
514  * read/write bit field.
515  */
516 #define sdev_rw_attr_bit(field)                                         \
517         sdev_show_function(field, "%d\n")                                       \
518                                                                         \
519 static ssize_t                                                          \
520 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
521                     const char *buf, size_t count)                      \
522 {                                                                       \
523         int ret;                                                        \
524         struct scsi_device *sdev;                                       \
525         ret = scsi_sdev_check_buf_bit(buf);                             \
526         if (ret >= 0)   {                                               \
527                 sdev = to_scsi_device(dev);                             \
528                 sdev->field = ret;                                      \
529                 ret = count;                                            \
530         }                                                               \
531         return ret;                                                     \
532 }                                                                       \
533 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
534
535 /*
536  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
537  * else return -EINVAL.
538  */
539 static int scsi_sdev_check_buf_bit(const char *buf)
540 {
541         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
542                 if (buf[0] == '1')
543                         return 1;
544                 else if (buf[0] == '0')
545                         return 0;
546                 else 
547                         return -EINVAL;
548         } else
549                 return -EINVAL;
550 }
551 #endif
552 /*
553  * Create the actual show/store functions and data structures.
554  */
555 sdev_rd_attr (device_blocked, "%d\n");
556 sdev_rd_attr (queue_depth, "%d\n");
557 sdev_rd_attr (type, "%d\n");
558 sdev_rd_attr (scsi_level, "%d\n");
559 sdev_rd_attr (vendor, "%.8s\n");
560 sdev_rd_attr (model, "%.16s\n");
561 sdev_rd_attr (rev, "%.4s\n");
562
563 /*
564  * TODO: can we make these symlinks to the block layer ones?
565  */
566 static ssize_t
567 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
568 {
569         struct scsi_device *sdev;
570         sdev = to_scsi_device(dev);
571         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
572 }
573
574 static ssize_t
575 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
576                     const char *buf, size_t count)
577 {
578         struct scsi_device *sdev;
579         int timeout;
580         sdev = to_scsi_device(dev);
581         sscanf (buf, "%d\n", &timeout);
582         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
583         return count;
584 }
585 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
586
587 static ssize_t
588 store_rescan_field (struct device *dev, struct device_attribute *attr,
589                     const char *buf, size_t count)
590 {
591         scsi_rescan_device(dev);
592         return count;
593 }
594 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
595
596 static void sdev_store_delete_callback(struct device *dev)
597 {
598         scsi_remove_device(to_scsi_device(dev));
599 }
600
601 static ssize_t
602 sdev_store_delete(struct device *dev, struct device_attribute *attr,
603                   const char *buf, size_t count)
604 {
605         int rc;
606
607         /* An attribute cannot be unregistered by one of its own methods,
608          * so we have to use this roundabout approach.
609          */
610         rc = device_schedule_callback(dev, sdev_store_delete_callback);
611         if (rc)
612                 count = rc;
613         return count;
614 };
615 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
616
617 static ssize_t
618 store_state_field(struct device *dev, struct device_attribute *attr,
619                   const char *buf, size_t count)
620 {
621         int i;
622         struct scsi_device *sdev = to_scsi_device(dev);
623         enum scsi_device_state state = 0;
624
625         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
626                 const int len = strlen(sdev_states[i].name);
627                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
628                    buf[len] == '\n') {
629                         state = sdev_states[i].value;
630                         break;
631                 }
632         }
633         if (!state)
634                 return -EINVAL;
635
636         if (scsi_device_set_state(sdev, state))
637                 return -EINVAL;
638         return count;
639 }
640
641 static ssize_t
642 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
643 {
644         struct scsi_device *sdev = to_scsi_device(dev);
645         const char *name = scsi_device_state_name(sdev->sdev_state);
646
647         if (!name)
648                 return -EINVAL;
649
650         return snprintf(buf, 20, "%s\n", name);
651 }
652
653 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
654
655 static ssize_t
656 show_queue_type_field(struct device *dev, struct device_attribute *attr,
657                       char *buf)
658 {
659         struct scsi_device *sdev = to_scsi_device(dev);
660         const char *name = "none";
661
662         if (sdev->ordered_tags)
663                 name = "ordered";
664         else if (sdev->simple_tags)
665                 name = "simple";
666
667         return snprintf(buf, 20, "%s\n", name);
668 }
669
670 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
671
672 static ssize_t
673 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,                              char *buf)
674 {
675         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
676 }
677
678 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
679
680 #define show_sdev_iostat(field)                                         \
681 static ssize_t                                                          \
682 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
683                     char *buf)                                          \
684 {                                                                       \
685         struct scsi_device *sdev = to_scsi_device(dev);                 \
686         unsigned long long count = atomic_read(&sdev->field);           \
687         return snprintf(buf, 20, "0x%llx\n", count);                    \
688 }                                                                       \
689 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
690
691 show_sdev_iostat(iorequest_cnt);
692 show_sdev_iostat(iodone_cnt);
693 show_sdev_iostat(ioerr_cnt);
694
695 static ssize_t
696 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
697 {
698         struct scsi_device *sdev;
699         sdev = to_scsi_device(dev);
700         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
701 }
702 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
703
704 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
705 static ssize_t                                                          \
706 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
707                      char *buf)                                         \
708 {                                                                       \
709         struct scsi_device *sdev = to_scsi_device(dev);                 \
710         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
711         return snprintf(buf, 20, "%d\n", val);                          \
712 }
713
714 #define DECLARE_EVT_STORE(name, Cap_name)                               \
715 static ssize_t                                                          \
716 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
717                       const char *buf, size_t count)                    \
718 {                                                                       \
719         struct scsi_device *sdev = to_scsi_device(dev);                 \
720         int val = simple_strtoul(buf, NULL, 0);                         \
721         if (val == 0)                                                   \
722                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
723         else if (val == 1)                                              \
724                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
725         else                                                            \
726                 return -EINVAL;                                         \
727         return count;                                                   \
728 }
729
730 #define DECLARE_EVT(name, Cap_name)                                     \
731         DECLARE_EVT_SHOW(name, Cap_name)                                \
732         DECLARE_EVT_STORE(name, Cap_name)                               \
733         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
734                            sdev_store_evt_##name);
735 #define REF_EVT(name) &dev_attr_evt_##name.attr
736
737 DECLARE_EVT(media_change, MEDIA_CHANGE)
738
739 /* Default template for device attributes.  May NOT be modified */
740 static struct attribute *scsi_sdev_attrs[] = {
741         &dev_attr_device_blocked.attr,
742         &dev_attr_type.attr,
743         &dev_attr_scsi_level.attr,
744         &dev_attr_vendor.attr,
745         &dev_attr_model.attr,
746         &dev_attr_rev.attr,
747         &dev_attr_rescan.attr,
748         &dev_attr_delete.attr,
749         &dev_attr_state.attr,
750         &dev_attr_timeout.attr,
751         &dev_attr_iocounterbits.attr,
752         &dev_attr_iorequest_cnt.attr,
753         &dev_attr_iodone_cnt.attr,
754         &dev_attr_ioerr_cnt.attr,
755         &dev_attr_modalias.attr,
756         REF_EVT(media_change),
757         NULL
758 };
759
760 static struct attribute_group scsi_sdev_attr_group = {
761         .attrs =        scsi_sdev_attrs,
762 };
763
764 static struct attribute_group *scsi_sdev_attr_groups[] = {
765         &scsi_sdev_attr_group,
766         NULL
767 };
768
769 static ssize_t
770 sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
771                           const char *buf, size_t count)
772 {
773         int depth, retval;
774         struct scsi_device *sdev = to_scsi_device(dev);
775         struct scsi_host_template *sht = sdev->host->hostt;
776
777         if (!sht->change_queue_depth)
778                 return -EINVAL;
779
780         depth = simple_strtoul(buf, NULL, 0);
781
782         if (depth < 1)
783                 return -EINVAL;
784
785         retval = sht->change_queue_depth(sdev, depth);
786         if (retval < 0)
787                 return retval;
788
789         return count;
790 }
791
792 static struct device_attribute sdev_attr_queue_depth_rw =
793         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
794                sdev_store_queue_depth_rw);
795
796 static ssize_t
797 sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
798                          const char *buf, size_t count)
799 {
800         struct scsi_device *sdev = to_scsi_device(dev);
801         struct scsi_host_template *sht = sdev->host->hostt;
802         int tag_type = 0, retval;
803         int prev_tag_type = scsi_get_tag_type(sdev);
804
805         if (!sdev->tagged_supported || !sht->change_queue_type)
806                 return -EINVAL;
807
808         if (strncmp(buf, "ordered", 7) == 0)
809                 tag_type = MSG_ORDERED_TAG;
810         else if (strncmp(buf, "simple", 6) == 0)
811                 tag_type = MSG_SIMPLE_TAG;
812         else if (strncmp(buf, "none", 4) != 0)
813                 return -EINVAL;
814
815         if (tag_type == prev_tag_type)
816                 return count;
817
818         retval = sht->change_queue_type(sdev, tag_type);
819         if (retval < 0)
820                 return retval;
821
822         return count;
823 }
824
825 static int scsi_target_add(struct scsi_target *starget)
826 {
827         int error;
828
829         if (starget->state != STARGET_CREATED)
830                 return 0;
831
832         error = device_add(&starget->dev);
833         if (error) {
834                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
835                 get_device(&starget->dev);
836                 scsi_target_reap(starget);
837                 put_device(&starget->dev);
838                 return error;
839         }
840         transport_add_device(&starget->dev);
841         starget->state = STARGET_RUNNING;
842
843         return 0;
844 }
845
846 static struct device_attribute sdev_attr_queue_type_rw =
847         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
848                sdev_store_queue_type_rw);
849
850 /**
851  * scsi_sysfs_add_sdev - add scsi device to sysfs
852  * @sdev:       scsi_device to add
853  *
854  * Return value:
855  *      0 on Success / non-zero on Failure
856  **/
857 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
858 {
859         int error, i;
860         struct request_queue *rq = sdev->request_queue;
861         struct scsi_target *starget = sdev->sdev_target;
862
863         if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0)
864                 return error;
865
866         error = scsi_target_add(starget);
867         if (error)
868                 return error;
869
870         transport_configure_device(&starget->dev);
871         error = device_add(&sdev->sdev_gendev);
872         if (error) {
873                 put_device(sdev->sdev_gendev.parent);
874                 printk(KERN_INFO "error 1\n");
875                 return error;
876         }
877         error = device_add(&sdev->sdev_dev);
878         if (error) {
879                 printk(KERN_INFO "error 2\n");
880                 goto clean_device;
881         }
882
883         /* take a reference for the sdev_dev; this is
884          * released by the sdev_class .release */
885         get_device(&sdev->sdev_gendev);
886
887         /* create queue files, which may be writable, depending on the host */
888         if (sdev->host->hostt->change_queue_depth)
889                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_depth_rw);
890         else
891                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
892         if (error) {
893                 __scsi_remove_device(sdev);
894                 goto out;
895         }
896         if (sdev->host->hostt->change_queue_type)
897                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
898         else
899                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
900         if (error) {
901                 __scsi_remove_device(sdev);
902                 goto out;
903         }
904
905         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
906
907         if (error)
908                 sdev_printk(KERN_INFO, sdev,
909                             "Failed to register bsg queue, errno=%d\n", error);
910
911         /* we're treating error on bsg register as non-fatal, so pretend
912          * nothing went wrong */
913         error = 0;
914
915         /* add additional host specific attributes */
916         if (sdev->host->hostt->sdev_attrs) {
917                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
918                         error = device_create_file(&sdev->sdev_gendev,
919                                         sdev->host->hostt->sdev_attrs[i]);
920                         if (error) {
921                                 __scsi_remove_device(sdev);
922                                 goto out;
923                         }
924                 }
925         }
926
927         transport_add_device(&sdev->sdev_gendev);
928  out:
929         return error;
930
931  clean_device:
932         scsi_device_set_state(sdev, SDEV_CANCEL);
933
934         device_del(&sdev->sdev_gendev);
935         transport_destroy_device(&sdev->sdev_gendev);
936         put_device(&sdev->sdev_gendev);
937
938         return error;
939 }
940
941 void __scsi_remove_device(struct scsi_device *sdev)
942 {
943         struct device *dev = &sdev->sdev_gendev;
944
945         if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
946                 return;
947
948         bsg_unregister_queue(sdev->request_queue);
949         device_unregister(&sdev->sdev_dev);
950         transport_remove_device(dev);
951         device_del(dev);
952         scsi_device_set_state(sdev, SDEV_DEL);
953         if (sdev->host->hostt->slave_destroy)
954                 sdev->host->hostt->slave_destroy(sdev);
955         transport_destroy_device(dev);
956         put_device(dev);
957 }
958
959 /**
960  * scsi_remove_device - unregister a device from the scsi bus
961  * @sdev:       scsi_device to unregister
962  **/
963 void scsi_remove_device(struct scsi_device *sdev)
964 {
965         struct Scsi_Host *shost = sdev->host;
966
967         mutex_lock(&shost->scan_mutex);
968         __scsi_remove_device(sdev);
969         mutex_unlock(&shost->scan_mutex);
970 }
971 EXPORT_SYMBOL(scsi_remove_device);
972
973 static void __scsi_remove_target(struct scsi_target *starget)
974 {
975         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
976         unsigned long flags;
977         struct scsi_device *sdev;
978
979         spin_lock_irqsave(shost->host_lock, flags);
980         starget->reap_ref++;
981  restart:
982         list_for_each_entry(sdev, &shost->__devices, siblings) {
983                 if (sdev->channel != starget->channel ||
984                     sdev->id != starget->id ||
985                     sdev->sdev_state == SDEV_DEL)
986                         continue;
987                 spin_unlock_irqrestore(shost->host_lock, flags);
988                 scsi_remove_device(sdev);
989                 spin_lock_irqsave(shost->host_lock, flags);
990                 goto restart;
991         }
992         spin_unlock_irqrestore(shost->host_lock, flags);
993         scsi_target_reap(starget);
994 }
995
996 static int __remove_child (struct device * dev, void * data)
997 {
998         if (scsi_is_target_device(dev))
999                 __scsi_remove_target(to_scsi_target(dev));
1000         return 0;
1001 }
1002
1003 /**
1004  * scsi_remove_target - try to remove a target and all its devices
1005  * @dev: generic starget or parent of generic stargets to be removed
1006  *
1007  * Note: This is slightly racy.  It is possible that if the user
1008  * requests the addition of another device then the target won't be
1009  * removed.
1010  */
1011 void scsi_remove_target(struct device *dev)
1012 {
1013         struct device *rdev;
1014
1015         if (scsi_is_target_device(dev)) {
1016                 __scsi_remove_target(to_scsi_target(dev));
1017                 return;
1018         }
1019
1020         rdev = get_device(dev);
1021         device_for_each_child(dev, NULL, __remove_child);
1022         put_device(rdev);
1023 }
1024 EXPORT_SYMBOL(scsi_remove_target);
1025
1026 int scsi_register_driver(struct device_driver *drv)
1027 {
1028         drv->bus = &scsi_bus_type;
1029
1030         return driver_register(drv);
1031 }
1032 EXPORT_SYMBOL(scsi_register_driver);
1033
1034 int scsi_register_interface(struct class_interface *intf)
1035 {
1036         intf->class = &sdev_class;
1037
1038         return class_interface_register(intf);
1039 }
1040 EXPORT_SYMBOL(scsi_register_interface);
1041
1042 /**
1043  * scsi_sysfs_add_host - add scsi host to subsystem
1044  * @shost:     scsi host struct to add to subsystem
1045  * @dev:       parent struct device pointer
1046  **/
1047 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1048 {
1049         int error, i;
1050
1051         /* add host specific attributes */
1052         if (shost->hostt->shost_attrs) {
1053                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1054                         error = device_create_file(&shost->shost_dev,
1055                                         shost->hostt->shost_attrs[i]);
1056                         if (error)
1057                                 return error;
1058                 }
1059         }
1060
1061         transport_register_device(&shost->shost_gendev);
1062         transport_configure_device(&shost->shost_gendev);
1063         return 0;
1064 }
1065
1066 static struct device_type scsi_dev_type = {
1067         .name =         "scsi_device",
1068         .release =      scsi_device_dev_release,
1069         .groups =       scsi_sdev_attr_groups,
1070 };
1071
1072 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1073 {
1074         unsigned long flags;
1075         struct Scsi_Host *shost = sdev->host;
1076         struct scsi_target  *starget = sdev->sdev_target;
1077
1078         device_initialize(&sdev->sdev_gendev);
1079         sdev->sdev_gendev.bus = &scsi_bus_type;
1080         sdev->sdev_gendev.type = &scsi_dev_type;
1081         sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d",
1082                 sdev->host->host_no, sdev->channel, sdev->id,
1083                 sdev->lun);
1084         
1085         device_initialize(&sdev->sdev_dev);
1086         sdev->sdev_dev.parent = &sdev->sdev_gendev;
1087         sdev->sdev_dev.class = &sdev_class;
1088         snprintf(sdev->sdev_dev.bus_id, BUS_ID_SIZE,
1089                  "%d:%d:%d:%d", sdev->host->host_no,
1090                  sdev->channel, sdev->id, sdev->lun);
1091         sdev->scsi_level = starget->scsi_level;
1092         transport_setup_device(&sdev->sdev_gendev);
1093         spin_lock_irqsave(shost->host_lock, flags);
1094         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1095         list_add_tail(&sdev->siblings, &shost->__devices);
1096         spin_unlock_irqrestore(shost->host_lock, flags);
1097 }
1098
1099 int scsi_is_sdev_device(const struct device *dev)
1100 {
1101         return dev->type == &scsi_dev_type;
1102 }
1103 EXPORT_SYMBOL(scsi_is_sdev_device);
1104
1105 /* A blank transport template that is used in drivers that don't
1106  * yet implement Transport Attributes */
1107 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };