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