[SCSI] add queue_depth ramp up code
[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         { 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 const 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 struct bus_type scsi_bus_type = {
424         .name           = "scsi",
425         .match          = scsi_bus_match,
426         .uevent         = scsi_bus_uevent,
427         .suspend        = scsi_bus_suspend,
428         .resume         = scsi_bus_resume,
429 };
430 EXPORT_SYMBOL_GPL(scsi_bus_type);
431
432 int scsi_sysfs_register(void)
433 {
434         int error;
435
436         error = bus_register(&scsi_bus_type);
437         if (!error) {
438                 error = class_register(&sdev_class);
439                 if (error)
440                         bus_unregister(&scsi_bus_type);
441         }
442
443         return error;
444 }
445
446 void scsi_sysfs_unregister(void)
447 {
448         class_unregister(&sdev_class);
449         bus_unregister(&scsi_bus_type);
450 }
451
452 /*
453  * sdev_show_function: macro to create an attr function that can be used to
454  * show a non-bit field.
455  */
456 #define sdev_show_function(field, format_string)                                \
457 static ssize_t                                                          \
458 sdev_show_##field (struct device *dev, struct device_attribute *attr,   \
459                    char *buf)                                           \
460 {                                                                       \
461         struct scsi_device *sdev;                                       \
462         sdev = to_scsi_device(dev);                                     \
463         return snprintf (buf, 20, format_string, sdev->field);          \
464 }                                                                       \
465
466 /*
467  * sdev_rd_attr: macro to create a function and attribute variable for a
468  * read only field.
469  */
470 #define sdev_rd_attr(field, format_string)                              \
471         sdev_show_function(field, format_string)                        \
472 static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
473
474
475 /*
476  * sdev_rd_attr: create a function and attribute variable for a
477  * read/write field.
478  */
479 #define sdev_rw_attr(field, format_string)                              \
480         sdev_show_function(field, format_string)                                \
481                                                                         \
482 static ssize_t                                                          \
483 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
484                     const char *buf, size_t count)                      \
485 {                                                                       \
486         struct scsi_device *sdev;                                       \
487         sdev = to_scsi_device(dev);                                     \
488         snscanf (buf, 20, format_string, &sdev->field);                 \
489         return count;                                                   \
490 }                                                                       \
491 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
492
493 /* Currently we don't export bit fields, but we might in future,
494  * so leave this code in */
495 #if 0
496 /*
497  * sdev_rd_attr: create a function and attribute variable for a
498  * read/write bit field.
499  */
500 #define sdev_rw_attr_bit(field)                                         \
501         sdev_show_function(field, "%d\n")                                       \
502                                                                         \
503 static ssize_t                                                          \
504 sdev_store_##field (struct device *dev, struct device_attribute *attr,  \
505                     const char *buf, size_t count)                      \
506 {                                                                       \
507         int ret;                                                        \
508         struct scsi_device *sdev;                                       \
509         ret = scsi_sdev_check_buf_bit(buf);                             \
510         if (ret >= 0)   {                                               \
511                 sdev = to_scsi_device(dev);                             \
512                 sdev->field = ret;                                      \
513                 ret = count;                                            \
514         }                                                               \
515         return ret;                                                     \
516 }                                                                       \
517 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
518
519 /*
520  * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
521  * else return -EINVAL.
522  */
523 static int scsi_sdev_check_buf_bit(const char *buf)
524 {
525         if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
526                 if (buf[0] == '1')
527                         return 1;
528                 else if (buf[0] == '0')
529                         return 0;
530                 else 
531                         return -EINVAL;
532         } else
533                 return -EINVAL;
534 }
535 #endif
536 /*
537  * Create the actual show/store functions and data structures.
538  */
539 sdev_rd_attr (device_blocked, "%d\n");
540 sdev_rd_attr (queue_depth, "%d\n");
541 sdev_rd_attr (type, "%d\n");
542 sdev_rd_attr (scsi_level, "%d\n");
543 sdev_rd_attr (vendor, "%.8s\n");
544 sdev_rd_attr (model, "%.16s\n");
545 sdev_rd_attr (rev, "%.4s\n");
546
547 /*
548  * TODO: can we make these symlinks to the block layer ones?
549  */
550 static ssize_t
551 sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
552 {
553         struct scsi_device *sdev;
554         sdev = to_scsi_device(dev);
555         return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
556 }
557
558 static ssize_t
559 sdev_store_timeout (struct device *dev, struct device_attribute *attr,
560                     const char *buf, size_t count)
561 {
562         struct scsi_device *sdev;
563         int timeout;
564         sdev = to_scsi_device(dev);
565         sscanf (buf, "%d\n", &timeout);
566         blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
567         return count;
568 }
569 static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
570
571 static ssize_t
572 store_rescan_field (struct device *dev, struct device_attribute *attr,
573                     const char *buf, size_t count)
574 {
575         scsi_rescan_device(dev);
576         return count;
577 }
578 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
579
580 static void sdev_store_delete_callback(struct device *dev)
581 {
582         scsi_remove_device(to_scsi_device(dev));
583 }
584
585 static ssize_t
586 sdev_store_delete(struct device *dev, struct device_attribute *attr,
587                   const char *buf, size_t count)
588 {
589         int rc;
590
591         /* An attribute cannot be unregistered by one of its own methods,
592          * so we have to use this roundabout approach.
593          */
594         rc = device_schedule_callback(dev, sdev_store_delete_callback);
595         if (rc)
596                 count = rc;
597         return count;
598 };
599 static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
600
601 static ssize_t
602 store_state_field(struct device *dev, struct device_attribute *attr,
603                   const char *buf, size_t count)
604 {
605         int i;
606         struct scsi_device *sdev = to_scsi_device(dev);
607         enum scsi_device_state state = 0;
608
609         for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
610                 const int len = strlen(sdev_states[i].name);
611                 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
612                    buf[len] == '\n') {
613                         state = sdev_states[i].value;
614                         break;
615                 }
616         }
617         if (!state)
618                 return -EINVAL;
619
620         if (scsi_device_set_state(sdev, state))
621                 return -EINVAL;
622         return count;
623 }
624
625 static ssize_t
626 show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
627 {
628         struct scsi_device *sdev = to_scsi_device(dev);
629         const char *name = scsi_device_state_name(sdev->sdev_state);
630
631         if (!name)
632                 return -EINVAL;
633
634         return snprintf(buf, 20, "%s\n", name);
635 }
636
637 static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
638
639 static ssize_t
640 show_queue_type_field(struct device *dev, struct device_attribute *attr,
641                       char *buf)
642 {
643         struct scsi_device *sdev = to_scsi_device(dev);
644         const char *name = "none";
645
646         if (sdev->ordered_tags)
647                 name = "ordered";
648         else if (sdev->simple_tags)
649                 name = "simple";
650
651         return snprintf(buf, 20, "%s\n", name);
652 }
653
654 static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
655
656 static ssize_t
657 show_iostat_counterbits(struct device *dev, struct device_attribute *attr,                              char *buf)
658 {
659         return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
660 }
661
662 static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
663
664 #define show_sdev_iostat(field)                                         \
665 static ssize_t                                                          \
666 show_iostat_##field(struct device *dev, struct device_attribute *attr,  \
667                     char *buf)                                          \
668 {                                                                       \
669         struct scsi_device *sdev = to_scsi_device(dev);                 \
670         unsigned long long count = atomic_read(&sdev->field);           \
671         return snprintf(buf, 20, "0x%llx\n", count);                    \
672 }                                                                       \
673 static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
674
675 show_sdev_iostat(iorequest_cnt);
676 show_sdev_iostat(iodone_cnt);
677 show_sdev_iostat(ioerr_cnt);
678
679 static ssize_t
680 sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
681 {
682         struct scsi_device *sdev;
683         sdev = to_scsi_device(dev);
684         return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
685 }
686 static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
687
688 #define DECLARE_EVT_SHOW(name, Cap_name)                                \
689 static ssize_t                                                          \
690 sdev_show_evt_##name(struct device *dev, struct device_attribute *attr, \
691                      char *buf)                                         \
692 {                                                                       \
693         struct scsi_device *sdev = to_scsi_device(dev);                 \
694         int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
695         return snprintf(buf, 20, "%d\n", val);                          \
696 }
697
698 #define DECLARE_EVT_STORE(name, Cap_name)                               \
699 static ssize_t                                                          \
700 sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
701                       const char *buf, size_t count)                    \
702 {                                                                       \
703         struct scsi_device *sdev = to_scsi_device(dev);                 \
704         int val = simple_strtoul(buf, NULL, 0);                         \
705         if (val == 0)                                                   \
706                 clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events); \
707         else if (val == 1)                                              \
708                 set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);   \
709         else                                                            \
710                 return -EINVAL;                                         \
711         return count;                                                   \
712 }
713
714 #define DECLARE_EVT(name, Cap_name)                                     \
715         DECLARE_EVT_SHOW(name, Cap_name)                                \
716         DECLARE_EVT_STORE(name, Cap_name)                               \
717         static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,   \
718                            sdev_store_evt_##name);
719 #define REF_EVT(name) &dev_attr_evt_##name.attr
720
721 DECLARE_EVT(media_change, MEDIA_CHANGE)
722
723 /* Default template for device attributes.  May NOT be modified */
724 static struct attribute *scsi_sdev_attrs[] = {
725         &dev_attr_device_blocked.attr,
726         &dev_attr_type.attr,
727         &dev_attr_scsi_level.attr,
728         &dev_attr_vendor.attr,
729         &dev_attr_model.attr,
730         &dev_attr_rev.attr,
731         &dev_attr_rescan.attr,
732         &dev_attr_delete.attr,
733         &dev_attr_state.attr,
734         &dev_attr_timeout.attr,
735         &dev_attr_iocounterbits.attr,
736         &dev_attr_iorequest_cnt.attr,
737         &dev_attr_iodone_cnt.attr,
738         &dev_attr_ioerr_cnt.attr,
739         &dev_attr_modalias.attr,
740         REF_EVT(media_change),
741         NULL
742 };
743
744 static struct attribute_group scsi_sdev_attr_group = {
745         .attrs =        scsi_sdev_attrs,
746 };
747
748 static const struct attribute_group *scsi_sdev_attr_groups[] = {
749         &scsi_sdev_attr_group,
750         NULL
751 };
752
753 static ssize_t
754 sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
755                           const char *buf, size_t count)
756 {
757         int depth, retval;
758         struct scsi_device *sdev = to_scsi_device(dev);
759         struct scsi_host_template *sht = sdev->host->hostt;
760
761         if (!sht->change_queue_depth)
762                 return -EINVAL;
763
764         depth = simple_strtoul(buf, NULL, 0);
765
766         if (depth < 1)
767                 return -EINVAL;
768
769         retval = sht->change_queue_depth(sdev, depth,
770                                          SCSI_QDEPTH_DEFAULT);
771         if (retval < 0)
772                 return retval;
773
774         sdev->max_queue_depth = sdev->queue_depth;
775
776         return count;
777 }
778
779 static struct device_attribute sdev_attr_queue_depth_rw =
780         __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
781                sdev_store_queue_depth_rw);
782
783 static ssize_t
784 sdev_show_queue_ramp_up_period(struct device *dev,
785                                struct device_attribute *attr,
786                                char *buf)
787 {
788         struct scsi_device *sdev;
789         sdev = to_scsi_device(dev);
790         return snprintf(buf, 20, "%u\n",
791                         jiffies_to_msecs(sdev->queue_ramp_up_period));
792 }
793
794 static ssize_t
795 sdev_store_queue_ramp_up_period(struct device *dev,
796                                 struct device_attribute *attr,
797                                 const char *buf, size_t count)
798 {
799         struct scsi_device *sdev = to_scsi_device(dev);
800         unsigned long period;
801
802         if (strict_strtoul(buf, 10, &period))
803                 return -EINVAL;
804
805         sdev->queue_ramp_up_period = msecs_to_jiffies(period);
806         return period;
807 }
808
809 static struct device_attribute sdev_attr_queue_ramp_up_period =
810         __ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
811                sdev_show_queue_ramp_up_period,
812                sdev_store_queue_ramp_up_period);
813
814 static ssize_t
815 sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
816                          const char *buf, size_t count)
817 {
818         struct scsi_device *sdev = to_scsi_device(dev);
819         struct scsi_host_template *sht = sdev->host->hostt;
820         int tag_type = 0, retval;
821         int prev_tag_type = scsi_get_tag_type(sdev);
822
823         if (!sdev->tagged_supported || !sht->change_queue_type)
824                 return -EINVAL;
825
826         if (strncmp(buf, "ordered", 7) == 0)
827                 tag_type = MSG_ORDERED_TAG;
828         else if (strncmp(buf, "simple", 6) == 0)
829                 tag_type = MSG_SIMPLE_TAG;
830         else if (strncmp(buf, "none", 4) != 0)
831                 return -EINVAL;
832
833         if (tag_type == prev_tag_type)
834                 return count;
835
836         retval = sht->change_queue_type(sdev, tag_type);
837         if (retval < 0)
838                 return retval;
839
840         return count;
841 }
842
843 static int scsi_target_add(struct scsi_target *starget)
844 {
845         int error;
846
847         if (starget->state != STARGET_CREATED)
848                 return 0;
849
850         error = device_add(&starget->dev);
851         if (error) {
852                 dev_err(&starget->dev, "target device_add failed, error %d\n", error);
853                 get_device(&starget->dev);
854                 scsi_target_reap(starget);
855                 put_device(&starget->dev);
856                 return error;
857         }
858         transport_add_device(&starget->dev);
859         starget->state = STARGET_RUNNING;
860
861         return 0;
862 }
863
864 static struct device_attribute sdev_attr_queue_type_rw =
865         __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
866                sdev_store_queue_type_rw);
867
868 /**
869  * scsi_sysfs_add_sdev - add scsi device to sysfs
870  * @sdev:       scsi_device to add
871  *
872  * Return value:
873  *      0 on Success / non-zero on Failure
874  **/
875 int scsi_sysfs_add_sdev(struct scsi_device *sdev)
876 {
877         int error, i;
878         struct request_queue *rq = sdev->request_queue;
879         struct scsi_target *starget = sdev->sdev_target;
880
881         if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0)
882                 return error;
883
884         error = scsi_target_add(starget);
885         if (error)
886                 return error;
887
888         transport_configure_device(&starget->dev);
889         error = device_add(&sdev->sdev_gendev);
890         if (error) {
891                 put_device(sdev->sdev_gendev.parent);
892                 printk(KERN_INFO "error 1\n");
893                 return error;
894         }
895         error = device_add(&sdev->sdev_dev);
896         if (error) {
897                 printk(KERN_INFO "error 2\n");
898                 goto clean_device;
899         }
900
901         /* create queue files, which may be writable, depending on the host */
902         if (sdev->host->hostt->change_queue_depth) {
903                 error = device_create_file(&sdev->sdev_gendev,
904                                            &sdev_attr_queue_depth_rw);
905                 error = device_create_file(&sdev->sdev_gendev,
906                                            &sdev_attr_queue_ramp_up_period);
907         }
908         else
909                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
910         if (error) {
911                 __scsi_remove_device(sdev);
912                 goto out;
913         }
914         if (sdev->host->hostt->change_queue_type)
915                 error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
916         else
917                 error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
918         if (error) {
919                 __scsi_remove_device(sdev);
920                 goto out;
921         }
922
923         error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
924
925         if (error)
926                 sdev_printk(KERN_INFO, sdev,
927                             "Failed to register bsg queue, errno=%d\n", error);
928
929         /* we're treating error on bsg register as non-fatal, so pretend
930          * nothing went wrong */
931         error = 0;
932
933         /* add additional host specific attributes */
934         if (sdev->host->hostt->sdev_attrs) {
935                 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
936                         error = device_create_file(&sdev->sdev_gendev,
937                                         sdev->host->hostt->sdev_attrs[i]);
938                         if (error) {
939                                 __scsi_remove_device(sdev);
940                                 goto out;
941                         }
942                 }
943         }
944
945         transport_add_device(&sdev->sdev_gendev);
946  out:
947         return error;
948
949  clean_device:
950         scsi_device_set_state(sdev, SDEV_CANCEL);
951
952         device_del(&sdev->sdev_gendev);
953         transport_destroy_device(&sdev->sdev_gendev);
954         put_device(&sdev->sdev_dev);
955         put_device(&sdev->sdev_gendev);
956
957         return error;
958 }
959
960 void __scsi_remove_device(struct scsi_device *sdev)
961 {
962         struct device *dev = &sdev->sdev_gendev;
963
964         if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
965                 return;
966
967         bsg_unregister_queue(sdev->request_queue);
968         device_unregister(&sdev->sdev_dev);
969         transport_remove_device(dev);
970         device_del(dev);
971         scsi_device_set_state(sdev, SDEV_DEL);
972         if (sdev->host->hostt->slave_destroy)
973                 sdev->host->hostt->slave_destroy(sdev);
974         transport_destroy_device(dev);
975         put_device(dev);
976 }
977
978 /**
979  * scsi_remove_device - unregister a device from the scsi bus
980  * @sdev:       scsi_device to unregister
981  **/
982 void scsi_remove_device(struct scsi_device *sdev)
983 {
984         struct Scsi_Host *shost = sdev->host;
985
986         mutex_lock(&shost->scan_mutex);
987         __scsi_remove_device(sdev);
988         mutex_unlock(&shost->scan_mutex);
989 }
990 EXPORT_SYMBOL(scsi_remove_device);
991
992 static void __scsi_remove_target(struct scsi_target *starget)
993 {
994         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
995         unsigned long flags;
996         struct scsi_device *sdev;
997
998         spin_lock_irqsave(shost->host_lock, flags);
999         starget->reap_ref++;
1000  restart:
1001         list_for_each_entry(sdev, &shost->__devices, siblings) {
1002                 if (sdev->channel != starget->channel ||
1003                     sdev->id != starget->id ||
1004                     sdev->sdev_state == SDEV_DEL)
1005                         continue;
1006                 spin_unlock_irqrestore(shost->host_lock, flags);
1007                 scsi_remove_device(sdev);
1008                 spin_lock_irqsave(shost->host_lock, flags);
1009                 goto restart;
1010         }
1011         spin_unlock_irqrestore(shost->host_lock, flags);
1012         scsi_target_reap(starget);
1013 }
1014
1015 static int __remove_child (struct device * dev, void * data)
1016 {
1017         if (scsi_is_target_device(dev))
1018                 __scsi_remove_target(to_scsi_target(dev));
1019         return 0;
1020 }
1021
1022 /**
1023  * scsi_remove_target - try to remove a target and all its devices
1024  * @dev: generic starget or parent of generic stargets to be removed
1025  *
1026  * Note: This is slightly racy.  It is possible that if the user
1027  * requests the addition of another device then the target won't be
1028  * removed.
1029  */
1030 void scsi_remove_target(struct device *dev)
1031 {
1032         struct device *rdev;
1033
1034         if (scsi_is_target_device(dev)) {
1035                 __scsi_remove_target(to_scsi_target(dev));
1036                 return;
1037         }
1038
1039         rdev = get_device(dev);
1040         device_for_each_child(dev, NULL, __remove_child);
1041         put_device(rdev);
1042 }
1043 EXPORT_SYMBOL(scsi_remove_target);
1044
1045 int scsi_register_driver(struct device_driver *drv)
1046 {
1047         drv->bus = &scsi_bus_type;
1048
1049         return driver_register(drv);
1050 }
1051 EXPORT_SYMBOL(scsi_register_driver);
1052
1053 int scsi_register_interface(struct class_interface *intf)
1054 {
1055         intf->class = &sdev_class;
1056
1057         return class_interface_register(intf);
1058 }
1059 EXPORT_SYMBOL(scsi_register_interface);
1060
1061 /**
1062  * scsi_sysfs_add_host - add scsi host to subsystem
1063  * @shost:     scsi host struct to add to subsystem
1064  **/
1065 int scsi_sysfs_add_host(struct Scsi_Host *shost)
1066 {
1067         int error, i;
1068
1069         /* add host specific attributes */
1070         if (shost->hostt->shost_attrs) {
1071                 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1072                         error = device_create_file(&shost->shost_dev,
1073                                         shost->hostt->shost_attrs[i]);
1074                         if (error)
1075                                 return error;
1076                 }
1077         }
1078
1079         transport_register_device(&shost->shost_gendev);
1080         transport_configure_device(&shost->shost_gendev);
1081         return 0;
1082 }
1083
1084 static struct device_type scsi_dev_type = {
1085         .name =         "scsi_device",
1086         .release =      scsi_device_dev_release,
1087         .groups =       scsi_sdev_attr_groups,
1088 };
1089
1090 void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1091 {
1092         unsigned long flags;
1093         struct Scsi_Host *shost = sdev->host;
1094         struct scsi_target  *starget = sdev->sdev_target;
1095
1096         device_initialize(&sdev->sdev_gendev);
1097         sdev->sdev_gendev.bus = &scsi_bus_type;
1098         sdev->sdev_gendev.type = &scsi_dev_type;
1099         dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%d",
1100                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1101
1102         device_initialize(&sdev->sdev_dev);
1103         sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1104         sdev->sdev_dev.class = &sdev_class;
1105         dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%d",
1106                      sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
1107         sdev->scsi_level = starget->scsi_level;
1108         transport_setup_device(&sdev->sdev_gendev);
1109         spin_lock_irqsave(shost->host_lock, flags);
1110         list_add_tail(&sdev->same_target_siblings, &starget->devices);
1111         list_add_tail(&sdev->siblings, &shost->__devices);
1112         spin_unlock_irqrestore(shost->host_lock, flags);
1113 }
1114
1115 int scsi_is_sdev_device(const struct device *dev)
1116 {
1117         return dev->type == &scsi_dev_type;
1118 }
1119 EXPORT_SYMBOL(scsi_is_sdev_device);
1120
1121 /* A blank transport template that is used in drivers that don't
1122  * yet implement Transport Attributes */
1123 struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };