Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[linux-2.6] / 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         { SDEV_CREATED_BLOCK, "created-blocked" },
38 };
39
40 const char *scsi_device_state_name(enum scsi_device_state state)
41 {
42         int i;
43         char *name = NULL;
44
45         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
46                 if (sdev_states[i].value == state) {
47                         name = sdev_states[i].name;
48                         break;
49                 }
50         }
51         return name;
52 }
53
54 static const struct {
55         enum scsi_host_state    value;
56         char                    *name;
57 } shost_states[] = {
58         { SHOST_CREATED, "created" },
59         { SHOST_RUNNING, "running" },
60         { SHOST_CANCEL, "cancel" },
61         { SHOST_DEL, "deleted" },
62         { SHOST_RECOVERY, "recovery" },
63         { SHOST_CANCEL_RECOVERY, "cancel/recovery" },
64         { SHOST_DEL_RECOVERY, "deleted/recovery", },
65 };
66 const char *scsi_host_state_name(enum scsi_host_state state)
67 {
68         int i;
69         char *name = NULL;
70
71         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
72                 if (shost_states[i].value == state) {
73                         name = shost_states[i].name;
74                         break;
75                 }
76         }
77         return name;
78 }
79
80 static int check_set(unsigned int *val, char *src)
81 {
82         char *last;
83
84         if (strncmp(src, "-", 20) == 0) {
85                 *val = SCAN_WILD_CARD;
86         } else {
87                 /*
88                  * Doesn't check for int overflow
89                  */
90                 *val = simple_strtoul(src, &last, 0);
91                 if (*last != '\0')
92                         return 1;
93         }
94         return 0;
95 }
96
97 static int scsi_scan(struct Scsi_Host *shost, const char *str)
98 {
99         char s1[15], s2[15], s3[15], junk;
100         unsigned int channel, id, lun;
101         int res;
102
103         res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk);
104         if (res != 3)
105                 return -EINVAL;
106         if (check_set(&channel, s1))
107                 return -EINVAL;
108         if (check_set(&id, s2))
109                 return -EINVAL;
110         if (check_set(&lun, s3))
111                 return -EINVAL;
112         if (shost->transportt->user_scan)
113                 res = shost->transportt->user_scan(shost, channel, id, lun);
114         else
115                 res = scsi_scan_host_selected(shost, channel, id, lun, 1);
116         return res;
117 }
118
119 /*
120  * shost_show_function: macro to create an attr function that can be used to
121  * show a non-bit field.
122  */
123 #define shost_show_function(name, field, format_string)                 \
124 static ssize_t                                                          \
125 show_##name (struct device *dev, struct device_attribute *attr,         \
126              char *buf)                                                 \
127 {                                                                       \
128         struct Scsi_Host *shost = class_to_shost(dev);                  \
129         return snprintf (buf, 20, format_string, shost->field);         \
130 }
131
132 /*
133  * shost_rd_attr: macro to create a function and attribute variable for a
134  * read only field.
135  */
136 #define shost_rd_attr2(name, field, format_string)                      \
137         shost_show_function(name, field, format_string)                 \
138 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
139
140 #define shost_rd_attr(field, format_string) \
141 shost_rd_attr2(field, field, format_string)
142
143 /*
144  * Create the actual show/store functions and data structures.
145  */
146
147 static ssize_t
148 store_scan(struct device *dev, struct device_attribute *attr,
149            const char *buf, size_t count)
150 {
151         struct Scsi_Host *shost = class_to_shost(dev);
152         int res;
153
154         res = scsi_scan(shost, buf);
155         if (res == 0)
156                 res = count;
157         return res;
158 };
159 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
160
161 static ssize_t
162 store_shost_state(struct device *dev, struct device_attribute *attr,
163                   const char *buf, size_t count)
164 {
165         int i;
166         struct Scsi_Host *shost = class_to_shost(dev);
167         enum scsi_host_state state = 0;
168
169         for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
170                 const int len = strlen(shost_states[i].name);
171                 if (strncmp(shost_states[i].name, buf, len) == 0 &&
172                    buf[len] == '\n') {
173                         state = shost_states[i].value;
174                         break;
175                 }
176         }
177         if (!state)
178                 return -EINVAL;
179
180         if (scsi_host_set_state(shost, state))
181                 return -EINVAL;
182         return count;
183 }
184
185 static ssize_t
186 show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
187 {
188         struct Scsi_Host *shost = class_to_shost(dev);
189         const char *name = scsi_host_state_name(shost->shost_state);
190
191         if (!name)
192                 return -EINVAL;
193
194         return snprintf(buf, 20, "%s\n", name);
195 }
196
197 /* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
198 struct device_attribute dev_attr_hstate =
199         __ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
200
201 static ssize_t
202 show_shost_mode(unsigned int mode, char *buf)
203 {
204         ssize_t len = 0;
205
206         if (mode & MODE_INITIATOR)
207                 len = sprintf(buf, "%s", "Initiator");
208
209         if (mode & MODE_TARGET)
210                 len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
211
212         len += sprintf(buf + len, "\n");
213
214         return len;
215 }
216
217 static ssize_t
218 show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
219                           char *buf)
220 {
221         struct Scsi_Host *shost = class_to_shost(dev);
222         unsigned int supported_mode = shost->hostt->supported_mode;
223
224         if (supported_mode == MODE_UNKNOWN)
225                 /* by default this should be initiator */
226                 supported_mode = MODE_INITIATOR;
227
228         return show_shost_mode(supported_mode, buf);
229 }
230
231 static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
232
233 static ssize_t
234 show_shost_active_mode(struct device *dev,
235                        struct device_attribute *attr, char *buf)
236 {
237         struct Scsi_Host *shost = class_to_shost(dev);
238
239         if (shost->active_mode == MODE_UNKNOWN)
240                 return snprintf(buf, 20, "unknown\n");
241         else
242                 return show_shost_mode(shost->active_mode, buf);
243 }
244
245 static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
246
247 shost_rd_attr(unique_id, "%u\n");
248 shost_rd_attr(host_busy, "%hu\n");
249 shost_rd_attr(cmd_per_lun, "%hd\n");
250 shost_rd_attr(can_queue, "%hd\n");
251 shost_rd_attr(sg_tablesize, "%hu\n");
252 shost_rd_attr(unchecked_isa_dma, "%d\n");
253 shost_rd_attr(prot_capabilities, "%u\n");
254 shost_rd_attr(prot_guard_type, "%hd\n");
255 shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
256
257 static struct attribute *scsi_sysfs_shost_attrs[] = {
258         &dev_attr_unique_id.attr,
259         &dev_attr_host_busy.attr,
260         &dev_attr_cmd_per_lun.attr,
261         &dev_attr_can_queue.attr,
262         &dev_attr_sg_tablesize.attr,
263         &dev_attr_unchecked_isa_dma.attr,
264         &dev_attr_proc_name.attr,
265         &dev_attr_scan.attr,
266         &dev_attr_hstate.attr,
267         &dev_attr_supported_mode.attr,
268         &dev_attr_active_mode.attr,
269         &dev_attr_prot_capabilities.attr,
270         &dev_attr_prot_guard_type.attr,
271         NULL
272 };
273
274 struct attribute_group scsi_shost_attr_group = {
275         .attrs =        scsi_sysfs_shost_attrs,
276 };
277
278 struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
279         &scsi_shost_attr_group,
280         NULL
281 };
282
283 static void scsi_device_cls_release(struct device *class_dev)
284 {
285         struct scsi_device *sdev;
286
287         sdev = class_to_sdev(class_dev);
288         put_device(&sdev->sdev_gendev);
289 }
290
291 static void scsi_device_dev_release_usercontext(struct work_struct *work)
292 {
293         struct scsi_device *sdev;
294         struct device *parent;
295         struct scsi_target *starget;
296         struct list_head *this, *tmp;
297         unsigned long flags;
298
299         sdev = container_of(work, struct scsi_device, ew.work);
300
301         parent = sdev->sdev_gendev.parent;
302         starget = to_scsi_target(parent);
303
304         spin_lock_irqsave(sdev->host->host_lock, flags);
305         starget->reap_ref++;
306         list_del(&sdev->siblings);
307         list_del(&sdev->same_target_siblings);
308         list_del(&sdev->starved_entry);
309         spin_unlock_irqrestore(sdev->host->host_lock, flags);
310
311         cancel_work_sync(&sdev->event_work);
312
313         list_for_each_safe(this, tmp, &sdev->event_list) {
314                 struct scsi_event *evt;
315
316                 evt = list_entry(this, struct scsi_event, node);
317                 list_del(&evt->node);
318                 kfree(evt);
319         }
320
321         if (sdev->request_queue) {
322                 sdev->request_queue->queuedata = NULL;
323                 /* user context needed to free queue */
324                 scsi_free_queue(sdev->request_queue);
325                 /* temporary expedient, try to catch use of queue lock
326                  * after free of sdev */
327                 sdev->request_queue = NULL;
328         }
329
330         scsi_target_reap(scsi_target(sdev));
331
332         kfree(sdev->inquiry);
333         kfree(sdev);
334
335         if (parent)
336                 put_device(parent);
337 }
338
339 static void scsi_device_dev_release(struct device *dev)
340 {
341         struct scsi_device *sdp = to_scsi_device(dev);
342         execute_in_process_context(scsi_device_dev_release_usercontext,
343                                    &sdp->ew);
344 }
345
346 static struct class sdev_class = {
347         .name           = "scsi_device",
348         .dev_release    = scsi_device_cls_release,
349 };
350
351 /* all probing is done in the individual ->probe routines */
352 static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
353 {
354         struct scsi_device *sdp;
355
356         if (dev->type != &scsi_dev_type)
357                 return 0;
358
359         sdp = to_scsi_device(dev);
360         if (sdp->no_uld_attach)
361                 return 0;
362         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
363 }
364
365 static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
366 {
367         struct scsi_device *sdev;
368
369         if (dev->type != &scsi_dev_type)
370                 return 0;
371
372         sdev = to_scsi_device(dev);
373
374         add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
375         return 0;
376 }
377
378 static int scsi_bus_suspend(struct device * dev, pm_message_t state)
379 {
380         struct device_driver *drv;
381         struct scsi_device *sdev;
382         int err;
383
384         if (dev->type != &scsi_dev_type)
385                 return 0;
386
387         drv = dev->driver;
388         sdev = to_scsi_device(dev);
389
390         err = scsi_device_quiesce(sdev);
391         if (err)
392                 return err;
393
394         if (drv && drv->suspend) {
395                 err = drv->suspend(dev, state);
396                 if (err)
397                         return err;
398         }
399
400         return 0;
401 }
402
403 static int scsi_bus_resume(struct device * dev)
404 {
405         struct device_driver *drv;
406         struct scsi_device *sdev;
407         int err = 0;
408
409         if (dev->type != &scsi_dev_type)
410                 return 0;
411
412         drv = dev->driver;
413         sdev = to_scsi_device(dev);
414
415         if (drv && drv->resume)
416                 err = drv->resume(dev);
417
418         scsi_device_resume(sdev);
419
420         return err;
421 }
422
423 static int scsi_bus_remove(struct device *dev)
424 {
425         struct device_driver *drv = dev->driver;
426         struct scsi_device *sdev = to_scsi_device(dev);
427         int err = 0;
428
429         /* reset the prep_fn back to the default since the
430          * driver may have altered it and it's being removed */
431         blk_queue_prep_rq(sdev->request_queue, scsi_prep_fn);
432
433         if (drv && drv->remove)
434                 err = drv->remove(dev);
435
436         return 0;
437 }
438
439 struct bus_type scsi_bus_type = {
440         .name           = "scsi",
441         .match          = scsi_bus_match,
442         .uevent         = scsi_bus_uevent,
443         .suspend        = scsi_bus_suspend,
444         .resume         = scsi_bus_resume,
445         .remove         = scsi_bus_remove,
446 };
447 EXPORT_SYMBOL_GPL(scsi_bus_type);
448
449 int scsi_sysfs_register(void)
450 {
451         int error;
452
453         error = bus_register(&scsi_bus_type);
454         if (!error) {
455                 error = class_register(&sdev_class);
456                 if (error)
457                         bus_unregister(&scsi_bus_type);
458         }
459
460         return error;
461 }
462
463 void scsi_sysfs_unregister(void)
464 {
465         class_unregister(&sdev_class);
466         bus_unregister(&scsi_bus_type);
467 }
468
469 /*
470  * sdev_show_function: macro to create an attr function that can be used to
471  * show a non-bit field.
472  */
473 #define sdev_show_function(field, format_string)                                \
474 static ssize_t                                                          \
475 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
476                    char *buf)                                           \
477 {                                                                       \
478         struct scsi_device *sdev;                                       \
479         sdev = to_scsi_device(dev);                                     \
480         return snprintf (buf, 20, format_string, sdev->field);          \
481 }                                                                       \
482
483 /*
484  * sdev_rd_attr: macro to create a function and attribute variable for a
485  * read only field.
486  */
487 #define sdev_rd_attr(field, format_string)                              \
488         sdev_show_function(field, format_string)                        \
489 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
490
491
492 /*
493  * sdev_rd_attr: create a function and attribute variable for a
494  * read/write field.
495  */
496 #define sdev_rw_attr(field, format_string)                              \
497         sdev_show_function(field, format_string)                                \
498                                                                         \
499 static ssize_t                                                          \
500 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
501                     const char *buf, size_t count)                      \
502 {                                                                       \
503         struct scsi_device *sdev;                                       \
504         sdev = to_scsi_device(dev);                                     \
505         snscanf (buf, 20, format_string, &sdev->field);                 \
506         return count;                                                   \
507 }                                                                       \
508 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
509
510 /* Currently we don't export bit fields, but we might in future,
511  * so leave this code in */
512 #if 0
513 /*
514  * sdev_rd_attr: create a function and attribute variable for a
515  * read/write bit field.
516  */
517 #define sdev_rw_attr_bit(field)                                         \
518         sdev_show_function(field, "%d\n")                                       \
519                                                                         \
520 static ssize_t                                                          \
521 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
522                     const char *buf, size_t count)                      \
523 {                                                                       \
524         int ret;                                                        \
525         struct scsi_device *sdev;                                       \
526         ret = scsi_sdev_check_buf_bit(buf);                             \
527         if (ret >= 0)   {                                               \
528                 sdev = to_scsi_device(dev);                             \
529                 sdev->field = ret;                                      \
530                 ret = count;                                            \
531         }                                                               \
532         return ret;                                                     \
533 }                                                                       \
534 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
535
536 /*
537  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
538  * else return -EINVAL.
539  */
540 static int scsi_sdev_check_buf_bit(const char *buf)
541 {
542         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
543                 if (buf[0] == '1')
544                         return 1;
545                 else if (buf[0] == '0')
546                         return 0;
547                 else 
548                         return -EINVAL;
549         } else
550                 return -EINVAL;
551 }
552 #endif
553 /*
554  * Create the actual show/store functions and data structures.
555  */
556 sdev_rd_attr (device_blocked, "%d\n");
557 sdev_rd_attr (queue_depth, "%d\n");
558 sdev_rd_attr (type, "%d\n");
559 sdev_rd_attr (scsi_level, "%d\n");
560 sdev_rd_attr (vendor, "%.8s\n");
561 sdev_rd_attr (model, "%.16s\n");
562 sdev_rd_attr (rev, "%.4s\n");
563
564 /*
565  * TODO: can we make these symlinks to the block layer ones?
566  */
567 static ssize_t
568 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
569 {
570         struct scsi_device *sdev;
571         sdev = to_scsi_device(dev);
572         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
573 }
574
575 static ssize_t
576 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
577                     const char *buf, size_t count)
578 {
579         struct scsi_device *sdev;
580         int timeout;
581         sdev = to_scsi_device(dev);
582         sscanf (buf, "%d\n", &timeout);
583         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
584         return count;
585 }
586 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
587
588 static ssize_t
589 store_rescan_field (struct device *dev, struct device_attribute *attr,
590                     const char *buf, size_t count)
591 {
592         scsi_rescan_device(dev);
593         return count;
594 }
595 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
596
597 static void sdev_store_delete_callback(struct device *dev)
598 {
599         scsi_remove_device(to_scsi_device(dev));
600 }
601
602 static ssize_t
603 sdev_store_delete(struct device *dev, struct device_attribute *attr,
604                   const char *buf, size_t count)
605 {
606         int rc;
607
608         /* An attribute cannot be unregistered by one of its own methods,
609          * so we have to use this roundabout approach.
610          */
611         rc = device_schedule_callback(dev, sdev_store_delete_callback);
612         if (rc)
613                 count = rc;
614         return count;
615 };
616 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
617
618 static ssize_t
619 store_state_field(struct device *dev, struct device_attribute *attr,
620                   const char *buf, size_t count)
621 {
622         int i;
623         struct scsi_device *sdev = to_scsi_device(dev);
624         enum scsi_device_state state = 0;
625
626         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
627                 const int len = strlen(sdev_states[i].name);
628                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
629                    buf[len] == '\n') {
630                         state = sdev_states[i].value;
631                         break;
632                 }
633         }
634         if (!state)
635                 return -EINVAL;
636
637         if (scsi_device_set_state(sdev, state))
638                 return -EINVAL;
639         return count;
640 }
641
642 static ssize_t
643 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
644 {
645         struct scsi_device *sdev = to_scsi_device(dev);
646         const char *name = scsi_device_state_name(sdev->sdev_state);
647
648         if (!name)
649                 return -EINVAL;
650
651         return snprintf(buf, 20, "%s\n", name);
652 }
653
654 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
655
656 static ssize_t
657 show_queue_type_field(struct device *dev, struct device_attribute *attr,
658                       char *buf)
659 {
660         struct scsi_device *sdev = to_scsi_device(dev);
661         const char *name = "none";
662
663         if (sdev->ordered_tags)
664                 name = "ordered";
665         else if (sdev->simple_tags)
666                 name = "simple";
667
668         return snprintf(buf, 20, "%s\n", name);
669 }
670
671 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
672
673 static ssize_t
674 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,                              char *buf)
675 {
676         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
677 }
678
679 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
680
681 #define show_sdev_iostat(field)                                         \
682 static ssize_t                                                          \
683 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
684                     char *buf)                                          \
685 {                                                                       \
686         struct scsi_device *sdev = to_scsi_device(dev);                 \
687         unsigned long long count = atomic_read(&sdev->field);           \
688         return snprintf(buf, 20, "0x%llx\n", count);                    \
689 }                                                                       \
690 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
691
692 show_sdev_iostat(iorequest_cnt);
693 show_sdev_iostat(iodone_cnt);
694 show_sdev_iostat(ioerr_cnt);
695
696 static ssize_t
697 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
698 {
699         struct scsi_device *sdev;
700         sdev = to_scsi_device(dev);
701         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
702 }
703 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
704
705 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
706 static ssize_t                                                          \
707 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
708                      char *buf)                                         \
709 {                                                                       \
710         struct scsi_device *sdev = to_scsi_device(dev);                 \
711         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
712         return snprintf(buf, 20, "%d\n", val);                          \
713 }
714
715 #define DECLARE_EVT_STORE(name, Cap_name)                               \
716 static ssize_t                                                          \
717 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
718                       const char *buf, size_t count)                    \
719 {                                                                       \
720         struct scsi_device *sdev = to_scsi_device(dev);                 \
721         int val = simple_strtoul(buf, NULL, 0);                         \
722         if (val == 0)                                                   \
723                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
724         else if (val == 1)                                              \
725                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
726         else                                                            \
727                 return -EINVAL;                                         \
728         return count;                                                   \
729 }
730
731 #define DECLARE_EVT(name, Cap_name)                                     \
732         DECLARE_EVT_SHOW(name, Cap_name)                                \
733         DECLARE_EVT_STORE(name, Cap_name)                               \
734         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
735                            sdev_store_evt_##name);
736 #define REF_EVT(name) &dev_attr_evt_##name.attr
737
738 DECLARE_EVT(media_change, MEDIA_CHANGE)
739
740 /* Default template for device attributes.  May NOT be modified */
741 static struct attribute *scsi_sdev_attrs[] = {
742         &dev_attr_device_blocked.attr,
743         &dev_attr_type.attr,
744         &dev_attr_scsi_level.attr,
745         &dev_attr_vendor.attr,
746         &dev_attr_model.attr,
747         &dev_attr_rev.attr,
748         &dev_attr_rescan.attr,
749         &dev_attr_delete.attr,
750         &dev_attr_state.attr,
751         &dev_attr_timeout.attr,
752         &dev_attr_iocounterbits.attr,
753         &dev_attr_iorequest_cnt.attr,
754         &dev_attr_iodone_cnt.attr,
755         &dev_attr_ioerr_cnt.attr,
756         &dev_attr_modalias.attr,
757         REF_EVT(media_change),
758         NULL
759 };
760
761 static struct attribute_group scsi_sdev_attr_group = {
762         .attrs =        scsi_sdev_attrs,
763 };
764
765 static struct attribute_group *scsi_sdev_attr_groups[] = {
766         &scsi_sdev_attr_group,
767         NULL
768 };
769
770 static ssize_t
771 sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
772                           const char *buf, size_t count)
773 {
774         int depth, retval;
775         struct scsi_device *sdev = to_scsi_device(dev);
776         struct scsi_host_template *sht = sdev->host->hostt;
777
778         if (!sht->change_queue_depth)
779                 return -EINVAL;
780
781         depth = simple_strtoul(buf, NULL, 0);
782
783         if (depth < 1)
784                 return -EINVAL;
785
786         retval = sht->change_queue_depth(sdev, depth);
787         if (retval < 0)
788                 return retval;
789
790         return count;
791 }
792
793 static struct device_attribute sdev_attr_queue_depth_rw =
794         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
795                sdev_store_queue_depth_rw);
796
797 static ssize_t
798 sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
799                          const char *buf, size_t count)
800 {
801         struct scsi_device *sdev = to_scsi_device(dev);
802         struct scsi_host_template *sht = sdev->host->hostt;
803         int tag_type = 0, retval;
804         int prev_tag_type = scsi_get_tag_type(sdev);
805
806         if (!sdev->tagged_supported || !sht->change_queue_type)
807                 return -EINVAL;
808
809         if (strncmp(buf, "ordered", 7) == 0)
810                 tag_type = MSG_ORDERED_TAG;
811         else if (strncmp(buf, "simple", 6) == 0)
812                 tag_type = MSG_SIMPLE_TAG;
813         else if (strncmp(buf, "none", 4) != 0)
814                 return -EINVAL;
815
816         if (tag_type == prev_tag_type)
817                 return count;
818
819         retval = sht->change_queue_type(sdev, tag_type);
820         if (retval < 0)
821                 return retval;
822
823         return count;
824 }
825
826 static int scsi_target_add(struct scsi_target *starget)
827 {
828         int error;
829
830         if (starget->state != STARGET_CREATED)
831                 return 0;
832
833         error = device_add(&starget->dev);
834         if (error) {
835                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
836                 get_device(&starget->dev);
837                 scsi_target_reap(starget);
838                 put_device(&starget->dev);
839                 return error;
840         }
841         transport_add_device(&starget->dev);
842         starget->state = STARGET_RUNNING;
843
844         return 0;
845 }
846
847 static struct device_attribute sdev_attr_queue_type_rw =
848         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
849                sdev_store_queue_type_rw);
850
851 /**
852  * scsi_sysfs_add_sdev - add scsi device to sysfs
853  * @sdev:       scsi_device to add
854  *
855  * Return value:
856  *      0 on Success / non-zero on Failure
857  **/
858 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
859 {
860         int error, i;
861         struct request_queue *rq = sdev->request_queue;
862         struct scsi_target *starget = sdev->sdev_target;
863
864         if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0)
865                 return error;
866
867         error = scsi_target_add(starget);
868         if (error)
869                 return error;
870
871         transport_configure_device(&starget->dev);
872         error = device_add(&sdev->sdev_gendev);
873         if (error) {
874                 put_device(sdev->sdev_gendev.parent);
875                 printk(KERN_INFO "error 1\n");
876                 return error;
877         }
878         error = device_add(&sdev->sdev_dev);
879         if (error) {
880                 printk(KERN_INFO "error 2\n");
881                 goto clean_device;
882         }
883
884         /* take a reference for the sdev_dev; this is
885          * released by the sdev_class .release */
886         get_device(&sdev->sdev_gendev);
887
888         /* create queue files, which may be writable, depending on the host */
889         if (sdev->host->hostt->change_queue_depth)
890                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_depth_rw);
891         else
892                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
893         if (error) {
894                 __scsi_remove_device(sdev);
895                 goto out;
896         }
897         if (sdev->host->hostt->change_queue_type)
898                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
899         else
900                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
901         if (error) {
902                 __scsi_remove_device(sdev);
903                 goto out;
904         }
905
906         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
907
908         if (error)
909                 sdev_printk(KERN_INFO, sdev,
910                             "Failed to register bsg queue, errno=%d\n", error);
911
912         /* we're treating error on bsg register as non-fatal, so pretend
913          * nothing went wrong */
914         error = 0;
915
916         /* add additional host specific attributes */
917         if (sdev->host->hostt->sdev_attrs) {
918                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
919                         error = device_create_file(&sdev->sdev_gendev,
920                                         sdev->host->hostt->sdev_attrs[i]);
921                         if (error) {
922                                 __scsi_remove_device(sdev);
923                                 goto out;
924                         }
925                 }
926         }
927
928         transport_add_device(&sdev->sdev_gendev);
929  out:
930         return error;
931
932  clean_device:
933         scsi_device_set_state(sdev, SDEV_CANCEL);
934
935         device_del(&sdev->sdev_gendev);
936         transport_destroy_device(&sdev->sdev_gendev);
937         put_device(&sdev->sdev_gendev);
938
939         return error;
940 }
941
942 void __scsi_remove_device(struct scsi_device *sdev)
943 {
944         struct device *dev = &sdev->sdev_gendev;
945
946         if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
947                 return;
948
949         bsg_unregister_queue(sdev->request_queue);
950         device_unregister(&sdev->sdev_dev);
951         transport_remove_device(dev);
952         device_del(dev);
953         scsi_device_set_state(sdev, SDEV_DEL);
954         if (sdev->host->hostt->slave_destroy)
955                 sdev->host->hostt->slave_destroy(sdev);
956         transport_destroy_device(dev);
957         put_device(dev);
958 }
959
960 /**
961  * scsi_remove_device - unregister a device from the scsi bus
962  * @sdev:       scsi_device to unregister
963  **/
964 void scsi_remove_device(struct scsi_device *sdev)
965 {
966         struct Scsi_Host *shost = sdev->host;
967
968         mutex_lock(&shost->scan_mutex);
969         __scsi_remove_device(sdev);
970         mutex_unlock(&shost->scan_mutex);
971 }
972 EXPORT_SYMBOL(scsi_remove_device);
973
974 static void __scsi_remove_target(struct scsi_target *starget)
975 {
976         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
977         unsigned long flags;
978         struct scsi_device *sdev;
979
980         spin_lock_irqsave(shost->host_lock, flags);
981         starget->reap_ref++;
982  restart:
983         list_for_each_entry(sdev, &shost->__devices, siblings) {
984                 if (sdev->channel != starget->channel ||
985                     sdev->id != starget->id ||
986                     sdev->sdev_state == SDEV_DEL)
987                         continue;
988                 spin_unlock_irqrestore(shost->host_lock, flags);
989                 scsi_remove_device(sdev);
990                 spin_lock_irqsave(shost->host_lock, flags);
991                 goto restart;
992         }
993         spin_unlock_irqrestore(shost->host_lock, flags);
994         scsi_target_reap(starget);
995 }
996
997 static int __remove_child (struct device * dev, void * data)
998 {
999         if (scsi_is_target_device(dev))
1000                 __scsi_remove_target(to_scsi_target(dev));
1001         return 0;
1002 }
1003
1004 /**
1005  * scsi_remove_target - try to remove a target and all its devices
1006  * @dev: generic starget or parent of generic stargets to be removed
1007  *
1008  * Note: This is slightly racy.  It is possible that if the user
1009  * requests the addition of another device then the target won't be
1010  * removed.
1011  */
1012 void scsi_remove_target(struct device *dev)
1013 {
1014         struct device *rdev;
1015
1016         if (scsi_is_target_device(dev)) {
1017                 __scsi_remove_target(to_scsi_target(dev));
1018                 return;
1019         }
1020
1021         rdev = get_device(dev);
1022         device_for_each_child(dev, NULL, __remove_child);
1023         put_device(rdev);
1024 }
1025 EXPORT_SYMBOL(scsi_remove_target);
1026
1027 int scsi_register_driver(struct device_driver *drv)
1028 {
1029         drv->bus = &scsi_bus_type;
1030
1031         return driver_register(drv);
1032 }
1033 EXPORT_SYMBOL(scsi_register_driver);
1034
1035 int scsi_register_interface(struct class_interface *intf)
1036 {
1037         intf->class = &sdev_class;
1038
1039         return class_interface_register(intf);
1040 }
1041 EXPORT_SYMBOL(scsi_register_interface);
1042
1043 /**
1044  * scsi_sysfs_add_host - add scsi host to subsystem
1045  * @shost:     scsi host struct to add to subsystem
1046  * @dev:       parent struct device pointer
1047  **/
1048 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1049 {
1050         int error, i;
1051
1052         /* add host specific attributes */
1053         if (shost->hostt->shost_attrs) {
1054                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1055                         error = device_create_file(&shost->shost_dev,
1056                                         shost->hostt->shost_attrs[i]);
1057                         if (error)
1058                                 return error;
1059                 }
1060         }
1061
1062         transport_register_device(&shost->shost_gendev);
1063         transport_configure_device(&shost->shost_gendev);
1064         return 0;
1065 }
1066
1067 static struct device_type scsi_dev_type = {
1068         .name =         "scsi_device",
1069         .release =      scsi_device_dev_release,
1070         .groups =       scsi_sdev_attr_groups,
1071 };
1072
1073 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1074 {
1075         unsigned long flags;
1076         struct Scsi_Host *shost = sdev->host;
1077         struct scsi_target  *starget = sdev->sdev_target;
1078
1079         device_initialize(&sdev->sdev_gendev);
1080         sdev->sdev_gendev.bus = &scsi_bus_type;
1081         sdev->sdev_gendev.type = &scsi_dev_type;
1082         sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d",
1083                 sdev->host->host_no, sdev->channel, sdev->id,
1084                 sdev->lun);
1085         
1086         device_initialize(&sdev->sdev_dev);
1087         sdev->sdev_dev.parent = &sdev->sdev_gendev;
1088         sdev->sdev_dev.class = &sdev_class;
1089         snprintf(sdev->sdev_dev.bus_id, BUS_ID_SIZE,
1090                  "%d:%d:%d:%d", sdev->host->host_no,
1091                  sdev->channel, sdev->id, sdev->lun);
1092         sdev->scsi_level = starget->scsi_level;
1093         transport_setup_device(&sdev->sdev_gendev);
1094         spin_lock_irqsave(shost->host_lock, flags);
1095         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1096         list_add_tail(&sdev->siblings, &shost->__devices);
1097         spin_unlock_irqrestore(shost->host_lock, flags);
1098 }
1099
1100 int scsi_is_sdev_device(const struct device *dev)
1101 {
1102         return dev->type == &scsi_dev_type;
1103 }
1104 EXPORT_SYMBOL(scsi_is_sdev_device);
1105
1106 /* A blank transport template that is used in drivers that don't
1107  * yet implement Transport Attributes */
1108 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };