[SCSI] Host protection capabilities
[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 static ssize_t
564 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
565 {
566         struct scsi_device *sdev;
567         sdev = to_scsi_device(dev);
568         return snprintf (buf, 20, "%d\n", sdev->timeout / HZ);
569 }
570
571 static ssize_t
572 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
573                     const char *buf, size_t count)
574 {
575         struct scsi_device *sdev;
576         int timeout;
577         sdev = to_scsi_device(dev);
578         sscanf (buf, "%d\n", &timeout);
579         sdev->timeout = timeout * HZ;
580         return count;
581 }
582 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
583
584 static ssize_t
585 store_rescan_field (struct device *dev, struct device_attribute *attr,
586                     const char *buf, size_t count)
587 {
588         scsi_rescan_device(dev);
589         return count;
590 }
591 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
592
593 static void sdev_store_delete_callback(struct device *dev)
594 {
595         scsi_remove_device(to_scsi_device(dev));
596 }
597
598 static ssize_t
599 sdev_store_delete(struct device *dev, struct device_attribute *attr,
600                   const char *buf, size_t count)
601 {
602         int rc;
603
604         /* An attribute cannot be unregistered by one of its own methods,
605          * so we have to use this roundabout approach.
606          */
607         rc = device_schedule_callback(dev, sdev_store_delete_callback);
608         if (rc)
609                 count = rc;
610         return count;
611 };
612 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
613
614 static ssize_t
615 store_state_field(struct device *dev, struct device_attribute *attr,
616                   const char *buf, size_t count)
617 {
618         int i;
619         struct scsi_device *sdev = to_scsi_device(dev);
620         enum scsi_device_state state = 0;
621
622         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
623                 const int len = strlen(sdev_states[i].name);
624                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
625                    buf[len] == '\n') {
626                         state = sdev_states[i].value;
627                         break;
628                 }
629         }
630         if (!state)
631                 return -EINVAL;
632
633         if (scsi_device_set_state(sdev, state))
634                 return -EINVAL;
635         return count;
636 }
637
638 static ssize_t
639 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
640 {
641         struct scsi_device *sdev = to_scsi_device(dev);
642         const char *name = scsi_device_state_name(sdev->sdev_state);
643
644         if (!name)
645                 return -EINVAL;
646
647         return snprintf(buf, 20, "%s\n", name);
648 }
649
650 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
651
652 static ssize_t
653 show_queue_type_field(struct device *dev, struct device_attribute *attr,
654                       char *buf)
655 {
656         struct scsi_device *sdev = to_scsi_device(dev);
657         const char *name = "none";
658
659         if (sdev->ordered_tags)
660                 name = "ordered";
661         else if (sdev->simple_tags)
662                 name = "simple";
663
664         return snprintf(buf, 20, "%s\n", name);
665 }
666
667 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
668
669 static ssize_t
670 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,                              char *buf)
671 {
672         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
673 }
674
675 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
676
677 #define show_sdev_iostat(field)                                         \
678 static ssize_t                                                          \
679 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
680                     char *buf)                                          \
681 {                                                                       \
682         struct scsi_device *sdev = to_scsi_device(dev);                 \
683         unsigned long long count = atomic_read(&sdev->field);           \
684         return snprintf(buf, 20, "0x%llx\n", count);                    \
685 }                                                                       \
686 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
687
688 show_sdev_iostat(iorequest_cnt);
689 show_sdev_iostat(iodone_cnt);
690 show_sdev_iostat(ioerr_cnt);
691
692 static ssize_t
693 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
694 {
695         struct scsi_device *sdev;
696         sdev = to_scsi_device(dev);
697         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
698 }
699 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
700
701 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
702 static ssize_t                                                          \
703 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
704                      char *buf)                                         \
705 {                                                                       \
706         struct scsi_device *sdev = to_scsi_device(dev);                 \
707         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
708         return snprintf(buf, 20, "%d\n", val);                          \
709 }
710
711 #define DECLARE_EVT_STORE(name, Cap_name)                               \
712 static ssize_t                                                          \
713 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
714                       const char *buf, size_t count)                    \
715 {                                                                       \
716         struct scsi_device *sdev = to_scsi_device(dev);                 \
717         int val = simple_strtoul(buf, NULL, 0);                         \
718         if (val == 0)                                                   \
719                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
720         else if (val == 1)                                              \
721                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
722         else                                                            \
723                 return -EINVAL;                                         \
724         return count;                                                   \
725 }
726
727 #define DECLARE_EVT(name, Cap_name)                                     \
728         DECLARE_EVT_SHOW(name, Cap_name)                                \
729         DECLARE_EVT_STORE(name, Cap_name)                               \
730         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
731                            sdev_store_evt_##name);
732 #define REF_EVT(name) &dev_attr_evt_##name.attr
733
734 DECLARE_EVT(media_change, MEDIA_CHANGE)
735
736 /* Default template for device attributes.  May NOT be modified */
737 static struct attribute *scsi_sdev_attrs[] = {
738         &dev_attr_device_blocked.attr,
739         &dev_attr_type.attr,
740         &dev_attr_scsi_level.attr,
741         &dev_attr_vendor.attr,
742         &dev_attr_model.attr,
743         &dev_attr_rev.attr,
744         &dev_attr_rescan.attr,
745         &dev_attr_delete.attr,
746         &dev_attr_state.attr,
747         &dev_attr_timeout.attr,
748         &dev_attr_iocounterbits.attr,
749         &dev_attr_iorequest_cnt.attr,
750         &dev_attr_iodone_cnt.attr,
751         &dev_attr_ioerr_cnt.attr,
752         &dev_attr_modalias.attr,
753         REF_EVT(media_change),
754         NULL
755 };
756
757 static struct attribute_group scsi_sdev_attr_group = {
758         .attrs =        scsi_sdev_attrs,
759 };
760
761 static struct attribute_group *scsi_sdev_attr_groups[] = {
762         &scsi_sdev_attr_group,
763         NULL
764 };
765
766 static ssize_t
767 sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
768                           const char *buf, size_t count)
769 {
770         int depth, retval;
771         struct scsi_device *sdev = to_scsi_device(dev);
772         struct scsi_host_template *sht = sdev->host->hostt;
773
774         if (!sht->change_queue_depth)
775                 return -EINVAL;
776
777         depth = simple_strtoul(buf, NULL, 0);
778
779         if (depth < 1)
780                 return -EINVAL;
781
782         retval = sht->change_queue_depth(sdev, depth);
783         if (retval < 0)
784                 return retval;
785
786         return count;
787 }
788
789 static struct device_attribute sdev_attr_queue_depth_rw =
790         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
791                sdev_store_queue_depth_rw);
792
793 static ssize_t
794 sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
795                          const char *buf, size_t count)
796 {
797         struct scsi_device *sdev = to_scsi_device(dev);
798         struct scsi_host_template *sht = sdev->host->hostt;
799         int tag_type = 0, retval;
800         int prev_tag_type = scsi_get_tag_type(sdev);
801
802         if (!sdev->tagged_supported || !sht->change_queue_type)
803                 return -EINVAL;
804
805         if (strncmp(buf, "ordered", 7) == 0)
806                 tag_type = MSG_ORDERED_TAG;
807         else if (strncmp(buf, "simple", 6) == 0)
808                 tag_type = MSG_SIMPLE_TAG;
809         else if (strncmp(buf, "none", 4) != 0)
810                 return -EINVAL;
811
812         if (tag_type == prev_tag_type)
813                 return count;
814
815         retval = sht->change_queue_type(sdev, tag_type);
816         if (retval < 0)
817                 return retval;
818
819         return count;
820 }
821
822 static int scsi_target_add(struct scsi_target *starget)
823 {
824         int error;
825
826         if (starget->state != STARGET_CREATED)
827                 return 0;
828
829         error = device_add(&starget->dev);
830         if (error) {
831                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
832                 get_device(&starget->dev);
833                 scsi_target_reap(starget);
834                 put_device(&starget->dev);
835                 return error;
836         }
837         transport_add_device(&starget->dev);
838         starget->state = STARGET_RUNNING;
839
840         return 0;
841 }
842
843 static struct device_attribute sdev_attr_queue_type_rw =
844         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
845                sdev_store_queue_type_rw);
846
847 /**
848  * scsi_sysfs_add_sdev - add scsi device to sysfs
849  * @sdev:       scsi_device to add
850  *
851  * Return value:
852  *      0 on Success / non-zero on Failure
853  **/
854 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
855 {
856         int error, i;
857         struct request_queue *rq = sdev->request_queue;
858         struct scsi_target *starget = sdev->sdev_target;
859
860         if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0)
861                 return error;
862
863         error = scsi_target_add(starget);
864         if (error)
865                 return error;
866
867         transport_configure_device(&starget->dev);
868         error = device_add(&sdev->sdev_gendev);
869         if (error) {
870                 put_device(sdev->sdev_gendev.parent);
871                 printk(KERN_INFO "error 1\n");
872                 return error;
873         }
874         error = device_add(&sdev->sdev_dev);
875         if (error) {
876                 printk(KERN_INFO "error 2\n");
877                 goto clean_device;
878         }
879
880         /* take a reference for the sdev_dev; this is
881          * released by the sdev_class .release */
882         get_device(&sdev->sdev_gendev);
883
884         /* create queue files, which may be writable, depending on the host */
885         if (sdev->host->hostt->change_queue_depth)
886                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_depth_rw);
887         else
888                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
889         if (error) {
890                 __scsi_remove_device(sdev);
891                 goto out;
892         }
893         if (sdev->host->hostt->change_queue_type)
894                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
895         else
896                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
897         if (error) {
898                 __scsi_remove_device(sdev);
899                 goto out;
900         }
901
902         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
903
904         if (error)
905                 sdev_printk(KERN_INFO, sdev,
906                             "Failed to register bsg queue, errno=%d\n", error);
907
908         /* we're treating error on bsg register as non-fatal, so pretend
909          * nothing went wrong */
910         error = 0;
911
912         /* add additional host specific attributes */
913         if (sdev->host->hostt->sdev_attrs) {
914                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
915                         error = device_create_file(&sdev->sdev_gendev,
916                                         sdev->host->hostt->sdev_attrs[i]);
917                         if (error) {
918                                 __scsi_remove_device(sdev);
919                                 goto out;
920                         }
921                 }
922         }
923
924         transport_add_device(&sdev->sdev_gendev);
925  out:
926         return error;
927
928  clean_device:
929         scsi_device_set_state(sdev, SDEV_CANCEL);
930
931         device_del(&sdev->sdev_gendev);
932         transport_destroy_device(&sdev->sdev_gendev);
933         put_device(&sdev->sdev_gendev);
934
935         return error;
936 }
937
938 void __scsi_remove_device(struct scsi_device *sdev)
939 {
940         struct device *dev = &sdev->sdev_gendev;
941
942         if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
943                 return;
944
945         bsg_unregister_queue(sdev->request_queue);
946         device_unregister(&sdev->sdev_dev);
947         transport_remove_device(dev);
948         device_del(dev);
949         scsi_device_set_state(sdev, SDEV_DEL);
950         if (sdev->host->hostt->slave_destroy)
951                 sdev->host->hostt->slave_destroy(sdev);
952         transport_destroy_device(dev);
953         put_device(dev);
954 }
955
956 /**
957  * scsi_remove_device - unregister a device from the scsi bus
958  * @sdev:       scsi_device to unregister
959  **/
960 void scsi_remove_device(struct scsi_device *sdev)
961 {
962         struct Scsi_Host *shost = sdev->host;
963
964         mutex_lock(&shost->scan_mutex);
965         __scsi_remove_device(sdev);
966         mutex_unlock(&shost->scan_mutex);
967 }
968 EXPORT_SYMBOL(scsi_remove_device);
969
970 static void __scsi_remove_target(struct scsi_target *starget)
971 {
972         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
973         unsigned long flags;
974         struct scsi_device *sdev;
975
976         spin_lock_irqsave(shost->host_lock, flags);
977         starget->reap_ref++;
978  restart:
979         list_for_each_entry(sdev, &shost->__devices, siblings) {
980                 if (sdev->channel != starget->channel ||
981                     sdev->id != starget->id ||
982                     sdev->sdev_state == SDEV_DEL)
983                         continue;
984                 spin_unlock_irqrestore(shost->host_lock, flags);
985                 scsi_remove_device(sdev);
986                 spin_lock_irqsave(shost->host_lock, flags);
987                 goto restart;
988         }
989         spin_unlock_irqrestore(shost->host_lock, flags);
990         scsi_target_reap(starget);
991 }
992
993 static int __remove_child (struct device * dev, void * data)
994 {
995         if (scsi_is_target_device(dev))
996                 __scsi_remove_target(to_scsi_target(dev));
997         return 0;
998 }
999
1000 /**
1001  * scsi_remove_target - try to remove a target and all its devices
1002  * @dev: generic starget or parent of generic stargets to be removed
1003  *
1004  * Note: This is slightly racy.  It is possible that if the user
1005  * requests the addition of another device then the target won't be
1006  * removed.
1007  */
1008 void scsi_remove_target(struct device *dev)
1009 {
1010         struct device *rdev;
1011
1012         if (scsi_is_target_device(dev)) {
1013                 __scsi_remove_target(to_scsi_target(dev));
1014                 return;
1015         }
1016
1017         rdev = get_device(dev);
1018         device_for_each_child(dev, NULL, __remove_child);
1019         put_device(rdev);
1020 }
1021 EXPORT_SYMBOL(scsi_remove_target);
1022
1023 int scsi_register_driver(struct device_driver *drv)
1024 {
1025         drv->bus = &scsi_bus_type;
1026
1027         return driver_register(drv);
1028 }
1029 EXPORT_SYMBOL(scsi_register_driver);
1030
1031 int scsi_register_interface(struct class_interface *intf)
1032 {
1033         intf->class = &sdev_class;
1034
1035         return class_interface_register(intf);
1036 }
1037 EXPORT_SYMBOL(scsi_register_interface);
1038
1039 /**
1040  * scsi_sysfs_add_host - add scsi host to subsystem
1041  * @shost:     scsi host struct to add to subsystem
1042  * @dev:       parent struct device pointer
1043  **/
1044 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1045 {
1046         int error, i;
1047
1048         /* add host specific attributes */
1049         if (shost->hostt->shost_attrs) {
1050                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1051                         error = device_create_file(&shost->shost_dev,
1052                                         shost->hostt->shost_attrs[i]);
1053                         if (error)
1054                                 return error;
1055                 }
1056         }
1057
1058         transport_register_device(&shost->shost_gendev);
1059         transport_configure_device(&shost->shost_gendev);
1060         return 0;
1061 }
1062
1063 static struct device_type scsi_dev_type = {
1064         .name =         "scsi_device",
1065         .release =      scsi_device_dev_release,
1066         .groups =       scsi_sdev_attr_groups,
1067 };
1068
1069 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1070 {
1071         unsigned long flags;
1072         struct Scsi_Host *shost = sdev->host;
1073         struct scsi_target  *starget = sdev->sdev_target;
1074
1075         device_initialize(&sdev->sdev_gendev);
1076         sdev->sdev_gendev.bus = &scsi_bus_type;
1077         sdev->sdev_gendev.type = &scsi_dev_type;
1078         sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d",
1079                 sdev->host->host_no, sdev->channel, sdev->id,
1080                 sdev->lun);
1081         
1082         device_initialize(&sdev->sdev_dev);
1083         sdev->sdev_dev.parent = &sdev->sdev_gendev;
1084         sdev->sdev_dev.class = &sdev_class;
1085         snprintf(sdev->sdev_dev.bus_id, BUS_ID_SIZE,
1086                  "%d:%d:%d:%d", sdev->host->host_no,
1087                  sdev->channel, sdev->id, sdev->lun);
1088         sdev->scsi_level = starget->scsi_level;
1089         transport_setup_device(&sdev->sdev_gendev);
1090         spin_lock_irqsave(shost->host_lock, flags);
1091         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1092         list_add_tail(&sdev->siblings, &shost->__devices);
1093         spin_unlock_irqrestore(shost->host_lock, flags);
1094 }
1095
1096 int scsi_is_sdev_device(const struct device *dev)
1097 {
1098         return dev->type == &scsi_dev_type;
1099 }
1100 EXPORT_SYMBOL(scsi_is_sdev_device);
1101
1102 /* A blank transport template that is used in drivers that don't
1103  * yet implement Transport Attributes */
1104 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };