blob: dae59d1da07a720b11f2f74b5696263a8d863e3b [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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/config.h>
10#include <linux/module.h>
11#include <linux/init.h>
12#include <linux/blkdev.h>
13#include <linux/device.h>
14
15#include <scsi/scsi.h>
16#include <scsi/scsi_device.h>
17#include <scsi/scsi_host.h>
18#include <scsi/scsi_tcq.h>
19#include <scsi/scsi_transport.h>
20
21#include "scsi_priv.h"
22#include "scsi_logging.h"
23
24static 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
37const char *scsi_device_state_name(enum scsi_device_state state)
38{
39 int i;
40 char *name = NULL;
41
42 for (i = 0; i < sizeof(sdev_states)/sizeof(sdev_states[0]); i++) {
43 if (sdev_states[i].value == state) {
44 name = sdev_states[i].name;
45 break;
46 }
47 }
48 return name;
49}
50
Mike Andersond3301872005-06-16 11:12:38 -070051static 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};
61const char *scsi_host_state_name(enum scsi_host_state state)
62{
63 int i;
64 char *name = NULL;
65
66 for (i = 0; i < sizeof(shost_states)/sizeof(shost_states[0]); i++) {
67 if (shost_states[i].value == state) {
68 name = shost_states[i].name;
69 break;
70 }
71 }
72 return name;
73}
74
Linus Torvalds1da177e2005-04-16 15:20:36 -070075static int check_set(unsigned int *val, char *src)
76{
77 char *last;
78
79 if (strncmp(src, "-", 20) == 0) {
80 *val = SCAN_WILD_CARD;
81 } else {
82 /*
83 * Doesn't check for int overflow
84 */
85 *val = simple_strtoul(src, &last, 0);
86 if (*last != '\0')
87 return 1;
88 }
89 return 0;
90}
91
92static int scsi_scan(struct Scsi_Host *shost, const char *str)
93{
94 char s1[15], s2[15], s3[15], junk;
95 unsigned int channel, id, lun;
96 int res;
97
98 res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk);
99 if (res != 3)
100 return -EINVAL;
101 if (check_set(&channel, s1))
102 return -EINVAL;
103 if (check_set(&id, s2))
104 return -EINVAL;
105 if (check_set(&lun, s3))
106 return -EINVAL;
107 res = scsi_scan_host_selected(shost, channel, id, lun, 1);
108 return res;
109}
110
111/*
112 * shost_show_function: macro to create an attr function that can be used to
113 * show a non-bit field.
114 */
115#define shost_show_function(name, field, format_string) \
116static ssize_t \
117show_##name (struct class_device *class_dev, char *buf) \
118{ \
119 struct Scsi_Host *shost = class_to_shost(class_dev); \
120 return snprintf (buf, 20, format_string, shost->field); \
121}
122
123/*
124 * shost_rd_attr: macro to create a function and attribute variable for a
125 * read only field.
126 */
127#define shost_rd_attr2(name, field, format_string) \
128 shost_show_function(name, field, format_string) \
129static CLASS_DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
130
131#define shost_rd_attr(field, format_string) \
132shost_rd_attr2(field, field, format_string)
133
134/*
135 * Create the actual show/store functions and data structures.
136 */
137
138static ssize_t store_scan(struct class_device *class_dev, const char *buf,
139 size_t count)
140{
141 struct Scsi_Host *shost = class_to_shost(class_dev);
142 int res;
143
144 res = scsi_scan(shost, buf);
145 if (res == 0)
146 res = count;
147 return res;
148};
149static CLASS_DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
150
Mike Andersond3301872005-06-16 11:12:38 -0700151static ssize_t
152store_shost_state(struct class_device *class_dev, const char *buf, size_t count)
153{
154 int i;
155 struct Scsi_Host *shost = class_to_shost(class_dev);
156 enum scsi_host_state state = 0;
157
158 for (i = 0; i < sizeof(shost_states)/sizeof(shost_states[0]); i++) {
159 const int len = strlen(shost_states[i].name);
160 if (strncmp(shost_states[i].name, buf, len) == 0 &&
161 buf[len] == '\n') {
162 state = shost_states[i].value;
163 break;
164 }
165 }
166 if (!state)
167 return -EINVAL;
168
169 if (scsi_host_set_state(shost, state))
170 return -EINVAL;
171 return count;
172}
173
174static ssize_t
175show_shost_state(struct class_device *class_dev, char *buf)
176{
177 struct Scsi_Host *shost = class_to_shost(class_dev);
178 const char *name = scsi_host_state_name(shost->shost_state);
179
180 if (!name)
181 return -EINVAL;
182
183 return snprintf(buf, 20, "%s\n", name);
184}
185
186static CLASS_DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
187
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188shost_rd_attr(unique_id, "%u\n");
189shost_rd_attr(host_busy, "%hu\n");
190shost_rd_attr(cmd_per_lun, "%hd\n");
191shost_rd_attr(sg_tablesize, "%hu\n");
192shost_rd_attr(unchecked_isa_dma, "%d\n");
193shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
194
195static struct class_device_attribute *scsi_sysfs_shost_attrs[] = {
196 &class_device_attr_unique_id,
197 &class_device_attr_host_busy,
198 &class_device_attr_cmd_per_lun,
199 &class_device_attr_sg_tablesize,
200 &class_device_attr_unchecked_isa_dma,
201 &class_device_attr_proc_name,
202 &class_device_attr_scan,
Mike Andersond3301872005-06-16 11:12:38 -0700203 &class_device_attr_state,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 NULL
205};
206
207static void scsi_device_cls_release(struct class_device *class_dev)
208{
209 struct scsi_device *sdev;
210
211 sdev = class_to_sdev(class_dev);
212 put_device(&sdev->sdev_gendev);
213}
214
Adrian Bunk52c1da32005-06-23 22:05:33 -0700215static void scsi_device_dev_release(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216{
217 struct scsi_device *sdev;
218 struct device *parent;
219 struct scsi_target *starget;
220 unsigned long flags;
221
222 parent = dev->parent;
223 sdev = to_scsi_device(dev);
224 starget = to_scsi_target(parent);
225
226 spin_lock_irqsave(sdev->host->host_lock, flags);
227 starget->reap_ref++;
228 list_del(&sdev->siblings);
229 list_del(&sdev->same_target_siblings);
230 list_del(&sdev->starved_entry);
231 spin_unlock_irqrestore(sdev->host->host_lock, flags);
232
233 if (sdev->request_queue) {
234 sdev->request_queue->queuedata = NULL;
235 scsi_free_queue(sdev->request_queue);
c2a93312005-04-12 16:38:09 -0500236 /* temporary expedient, try to catch use of queue lock
237 * after free of sdev */
238 sdev->request_queue = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 }
240
241 scsi_target_reap(scsi_target(sdev));
242
243 kfree(sdev->inquiry);
244 kfree(sdev);
245
246 if (parent)
247 put_device(parent);
248}
249
Adrian Bunk52c1da32005-06-23 22:05:33 -0700250static struct class sdev_class = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 .name = "scsi_device",
252 .release = scsi_device_cls_release,
253};
254
255/* all probing is done in the individual ->probe routines */
256static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
257{
258 struct scsi_device *sdp = to_scsi_device(dev);
259 if (sdp->no_uld_attach)
260 return 0;
261 return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
262}
263
264struct bus_type scsi_bus_type = {
265 .name = "scsi",
266 .match = scsi_bus_match,
267};
268
269int scsi_sysfs_register(void)
270{
271 int error;
272
273 error = bus_register(&scsi_bus_type);
274 if (!error) {
275 error = class_register(&sdev_class);
276 if (error)
277 bus_unregister(&scsi_bus_type);
278 }
279
280 return error;
281}
282
283void scsi_sysfs_unregister(void)
284{
285 class_unregister(&sdev_class);
286 bus_unregister(&scsi_bus_type);
287}
288
289/*
290 * sdev_show_function: macro to create an attr function that can be used to
291 * show a non-bit field.
292 */
293#define sdev_show_function(field, format_string) \
294static ssize_t \
Yani Ioannou10523b32005-05-17 06:43:37 -0400295sdev_show_##field (struct device *dev, struct device_attribute *attr, char *buf) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296{ \
297 struct scsi_device *sdev; \
298 sdev = to_scsi_device(dev); \
299 return snprintf (buf, 20, format_string, sdev->field); \
300} \
301
302/*
303 * sdev_rd_attr: macro to create a function and attribute variable for a
304 * read only field.
305 */
306#define sdev_rd_attr(field, format_string) \
307 sdev_show_function(field, format_string) \
308static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
309
310
311/*
312 * sdev_rd_attr: create a function and attribute variable for a
313 * read/write field.
314 */
315#define sdev_rw_attr(field, format_string) \
316 sdev_show_function(field, format_string) \
317 \
318static ssize_t \
Yani Ioannou10523b32005-05-17 06:43:37 -0400319sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320{ \
321 struct scsi_device *sdev; \
322 sdev = to_scsi_device(dev); \
323 snscanf (buf, 20, format_string, &sdev->field); \
324 return count; \
325} \
326static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
327
328/* Currently we don't export bit fields, but we might in future,
329 * so leave this code in */
330#if 0
331/*
332 * sdev_rd_attr: create a function and attribute variable for a
333 * read/write bit field.
334 */
335#define sdev_rw_attr_bit(field) \
336 sdev_show_function(field, "%d\n") \
337 \
338static ssize_t \
Yani Ioannou10523b32005-05-17 06:43:37 -0400339sdev_store_##field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340{ \
341 int ret; \
342 struct scsi_device *sdev; \
343 ret = scsi_sdev_check_buf_bit(buf); \
344 if (ret >= 0) { \
345 sdev = to_scsi_device(dev); \
346 sdev->field = ret; \
347 ret = count; \
348 } \
349 return ret; \
350} \
351static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
352
353/*
354 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
355 * else return -EINVAL.
356 */
357static int scsi_sdev_check_buf_bit(const char *buf)
358{
359 if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
360 if (buf[0] == '1')
361 return 1;
362 else if (buf[0] == '0')
363 return 0;
364 else
365 return -EINVAL;
366 } else
367 return -EINVAL;
368}
369#endif
370/*
371 * Create the actual show/store functions and data structures.
372 */
373sdev_rd_attr (device_blocked, "%d\n");
374sdev_rd_attr (queue_depth, "%d\n");
375sdev_rd_attr (type, "%d\n");
376sdev_rd_attr (scsi_level, "%d\n");
377sdev_rd_attr (vendor, "%.8s\n");
378sdev_rd_attr (model, "%.16s\n");
379sdev_rd_attr (rev, "%.4s\n");
380
381static ssize_t
Yani Ioannou10523b32005-05-17 06:43:37 -0400382sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383{
384 struct scsi_device *sdev;
385 sdev = to_scsi_device(dev);
386 return snprintf (buf, 20, "%d\n", sdev->timeout / HZ);
387}
388
389static ssize_t
Yani Ioannou10523b32005-05-17 06:43:37 -0400390sdev_store_timeout (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391{
392 struct scsi_device *sdev;
393 int timeout;
394 sdev = to_scsi_device(dev);
395 sscanf (buf, "%d\n", &timeout);
396 sdev->timeout = timeout * HZ;
397 return count;
398}
399static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
400
401static ssize_t
Yani Ioannou10523b32005-05-17 06:43:37 -0400402store_rescan_field (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403{
404 scsi_rescan_device(dev);
405 return count;
406}
407static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
408
Yani Ioannou10523b32005-05-17 06:43:37 -0400409static ssize_t sdev_store_delete(struct device *dev, struct device_attribute *attr, const char *buf,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 size_t count)
411{
412 scsi_remove_device(to_scsi_device(dev));
413 return count;
414};
415static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
416
417static ssize_t
Yani Ioannou10523b32005-05-17 06:43:37 -0400418store_state_field(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419{
420 int i;
421 struct scsi_device *sdev = to_scsi_device(dev);
422 enum scsi_device_state state = 0;
423
424 for (i = 0; i < sizeof(sdev_states)/sizeof(sdev_states[0]); i++) {
425 const int len = strlen(sdev_states[i].name);
426 if (strncmp(sdev_states[i].name, buf, len) == 0 &&
427 buf[len] == '\n') {
428 state = sdev_states[i].value;
429 break;
430 }
431 }
432 if (!state)
433 return -EINVAL;
434
435 if (scsi_device_set_state(sdev, state))
436 return -EINVAL;
437 return count;
438}
439
440static ssize_t
Yani Ioannou10523b32005-05-17 06:43:37 -0400441show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442{
443 struct scsi_device *sdev = to_scsi_device(dev);
444 const char *name = scsi_device_state_name(sdev->sdev_state);
445
446 if (!name)
447 return -EINVAL;
448
449 return snprintf(buf, 20, "%s\n", name);
450}
451
452static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
453
454static ssize_t
Yani Ioannou10523b32005-05-17 06:43:37 -0400455show_queue_type_field(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456{
457 struct scsi_device *sdev = to_scsi_device(dev);
458 const char *name = "none";
459
460 if (sdev->ordered_tags)
461 name = "ordered";
462 else if (sdev->simple_tags)
463 name = "simple";
464
465 return snprintf(buf, 20, "%s\n", name);
466}
467
468static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
469
470static ssize_t
Yani Ioannou10523b32005-05-17 06:43:37 -0400471show_iostat_counterbits(struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472{
473 return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
474}
475
476static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
477
478#define show_sdev_iostat(field) \
479static ssize_t \
Yani Ioannou10523b32005-05-17 06:43:37 -0400480show_iostat_##field(struct device *dev, struct device_attribute *attr, char *buf) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481{ \
482 struct scsi_device *sdev = to_scsi_device(dev); \
483 unsigned long long count = atomic_read(&sdev->field); \
484 return snprintf(buf, 20, "0x%llx\n", count); \
485} \
486static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
487
488show_sdev_iostat(iorequest_cnt);
489show_sdev_iostat(iodone_cnt);
490show_sdev_iostat(ioerr_cnt);
491
492
493/* Default template for device attributes. May NOT be modified */
494static struct device_attribute *scsi_sysfs_sdev_attrs[] = {
495 &dev_attr_device_blocked,
496 &dev_attr_queue_depth,
497 &dev_attr_queue_type,
498 &dev_attr_type,
499 &dev_attr_scsi_level,
500 &dev_attr_vendor,
501 &dev_attr_model,
502 &dev_attr_rev,
503 &dev_attr_rescan,
504 &dev_attr_delete,
505 &dev_attr_state,
506 &dev_attr_timeout,
507 &dev_attr_iocounterbits,
508 &dev_attr_iorequest_cnt,
509 &dev_attr_iodone_cnt,
510 &dev_attr_ioerr_cnt,
511 NULL
512};
513
Yani Ioannou10523b32005-05-17 06:43:37 -0400514static ssize_t sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr, const char *buf,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 size_t count)
516{
517 int depth, retval;
518 struct scsi_device *sdev = to_scsi_device(dev);
519 struct scsi_host_template *sht = sdev->host->hostt;
520
521 if (!sht->change_queue_depth)
522 return -EINVAL;
523
524 depth = simple_strtoul(buf, NULL, 0);
525
526 if (depth < 1)
527 return -EINVAL;
528
529 retval = sht->change_queue_depth(sdev, depth);
530 if (retval < 0)
531 return retval;
532
533 return count;
534}
535
536static struct device_attribute sdev_attr_queue_depth_rw =
537 __ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
538 sdev_store_queue_depth_rw);
539
Yani Ioannou10523b32005-05-17 06:43:37 -0400540static ssize_t sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr, const char *buf,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 size_t count)
542{
543 struct scsi_device *sdev = to_scsi_device(dev);
544 struct scsi_host_template *sht = sdev->host->hostt;
545 int tag_type = 0, retval;
546 int prev_tag_type = scsi_get_tag_type(sdev);
547
548 if (!sdev->tagged_supported || !sht->change_queue_type)
549 return -EINVAL;
550
551 if (strncmp(buf, "ordered", 7) == 0)
552 tag_type = MSG_ORDERED_TAG;
553 else if (strncmp(buf, "simple", 6) == 0)
554 tag_type = MSG_SIMPLE_TAG;
555 else if (strncmp(buf, "none", 4) != 0)
556 return -EINVAL;
557
558 if (tag_type == prev_tag_type)
559 return count;
560
561 retval = sht->change_queue_type(sdev, tag_type);
562 if (retval < 0)
563 return retval;
564
565 return count;
566}
567
568static struct device_attribute sdev_attr_queue_type_rw =
569 __ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
570 sdev_store_queue_type_rw);
571
572static struct device_attribute *attr_changed_internally(
573 struct Scsi_Host *shost,
574 struct device_attribute * attr)
575{
576 if (!strcmp("queue_depth", attr->attr.name)
577 && shost->hostt->change_queue_depth)
578 return &sdev_attr_queue_depth_rw;
579 else if (!strcmp("queue_type", attr->attr.name)
580 && shost->hostt->change_queue_type)
581 return &sdev_attr_queue_type_rw;
582 return attr;
583}
584
585
586static struct device_attribute *attr_overridden(
587 struct device_attribute **attrs,
588 struct device_attribute *attr)
589{
590 int i;
591
592 if (!attrs)
593 return NULL;
594 for (i = 0; attrs[i]; i++)
595 if (!strcmp(attrs[i]->attr.name, attr->attr.name))
596 return attrs[i];
597 return NULL;
598}
599
600static int attr_add(struct device *dev, struct device_attribute *attr)
601{
602 struct device_attribute *base_attr;
603
604 /*
605 * Spare the caller from having to copy things it's not interested in.
606 */
607 base_attr = attr_overridden(scsi_sysfs_sdev_attrs, attr);
608 if (base_attr) {
609 /* extend permissions */
610 attr->attr.mode |= base_attr->attr.mode;
611
612 /* override null show/store with default */
613 if (!attr->show)
614 attr->show = base_attr->show;
615 if (!attr->store)
616 attr->store = base_attr->store;
617 }
618
619 return device_create_file(dev, attr);
620}
621
622/**
623 * scsi_sysfs_add_sdev - add scsi device to sysfs
624 * @sdev: scsi_device to add
625 *
626 * Return value:
627 * 0 on Success / non-zero on Failure
628 **/
629int scsi_sysfs_add_sdev(struct scsi_device *sdev)
630{
631 int error, i;
632
633 if ((error = scsi_device_set_state(sdev, SDEV_RUNNING)) != 0)
634 return error;
635
636 error = device_add(&sdev->sdev_gendev);
637 if (error) {
638 put_device(sdev->sdev_gendev.parent);
639 printk(KERN_INFO "error 1\n");
640 return error;
641 }
642 error = class_device_add(&sdev->sdev_classdev);
643 if (error) {
644 printk(KERN_INFO "error 2\n");
645 goto clean_device;
646 }
647
648 /* take a reference for the sdev_classdev; this is
649 * released by the sdev_class .release */
650 get_device(&sdev->sdev_gendev);
651 if (sdev->host->hostt->sdev_attrs) {
652 for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
653 error = attr_add(&sdev->sdev_gendev,
654 sdev->host->hostt->sdev_attrs[i]);
655 if (error) {
656 scsi_remove_device(sdev);
657 goto out;
658 }
659 }
660 }
661
662 for (i = 0; scsi_sysfs_sdev_attrs[i]; i++) {
663 if (!attr_overridden(sdev->host->hostt->sdev_attrs,
664 scsi_sysfs_sdev_attrs[i])) {
665 struct device_attribute * attr =
666 attr_changed_internally(sdev->host,
667 scsi_sysfs_sdev_attrs[i]);
668 error = device_create_file(&sdev->sdev_gendev, attr);
669 if (error) {
670 scsi_remove_device(sdev);
671 goto out;
672 }
673 }
674 }
675
676 transport_add_device(&sdev->sdev_gendev);
677 out:
678 return error;
679
680 clean_device:
681 scsi_device_set_state(sdev, SDEV_CANCEL);
682
683 device_del(&sdev->sdev_gendev);
684 transport_destroy_device(&sdev->sdev_gendev);
685 put_device(&sdev->sdev_gendev);
686
687 return error;
688}
689
690/**
691 * scsi_remove_device - unregister a device from the scsi bus
692 * @sdev: scsi_device to unregister
693 **/
694void scsi_remove_device(struct scsi_device *sdev)
695{
696 struct Scsi_Host *shost = sdev->host;
697
698 down(&shost->scan_mutex);
699 if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
700 goto out;
701
702 class_device_unregister(&sdev->sdev_classdev);
703 device_del(&sdev->sdev_gendev);
704 scsi_device_set_state(sdev, SDEV_DEL);
705 if (sdev->host->hostt->slave_destroy)
706 sdev->host->hostt->slave_destroy(sdev);
707 transport_unregister_device(&sdev->sdev_gendev);
708 put_device(&sdev->sdev_gendev);
709out:
710 up(&shost->scan_mutex);
711}
712EXPORT_SYMBOL(scsi_remove_device);
713
714void __scsi_remove_target(struct scsi_target *starget)
715{
716 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
717 unsigned long flags;
718 struct scsi_device *sdev, *tmp;
719
720 spin_lock_irqsave(shost->host_lock, flags);
721 starget->reap_ref++;
722 list_for_each_entry_safe(sdev, tmp, &shost->__devices, siblings) {
723 if (sdev->channel != starget->channel ||
724 sdev->id != starget->id)
725 continue;
726 spin_unlock_irqrestore(shost->host_lock, flags);
727 scsi_remove_device(sdev);
728 spin_lock_irqsave(shost->host_lock, flags);
729 }
730 spin_unlock_irqrestore(shost->host_lock, flags);
731 scsi_target_reap(starget);
732}
733
mochel@digitalimplant.org20b1e672005-03-24 19:03:59 -0800734static int __remove_child (struct device * dev, void * data)
735{
736 if (scsi_is_target_device(dev))
737 __scsi_remove_target(to_scsi_target(dev));
738 return 0;
739}
740
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741/**
742 * scsi_remove_target - try to remove a target and all its devices
743 * @dev: generic starget or parent of generic stargets to be removed
744 *
745 * Note: This is slightly racy. It is possible that if the user
746 * requests the addition of another device then the target won't be
747 * removed.
748 */
749void scsi_remove_target(struct device *dev)
750{
mochel@digitalimplant.org20b1e672005-03-24 19:03:59 -0800751 struct device *rdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752
753 if (scsi_is_target_device(dev)) {
754 __scsi_remove_target(to_scsi_target(dev));
755 return;
756 }
757
758 rdev = get_device(dev);
mochel@digitalimplant.org20b1e672005-03-24 19:03:59 -0800759 device_for_each_child(dev, NULL, __remove_child);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 put_device(rdev);
761}
762EXPORT_SYMBOL(scsi_remove_target);
763
764int scsi_register_driver(struct device_driver *drv)
765{
766 drv->bus = &scsi_bus_type;
767
768 return driver_register(drv);
769}
770EXPORT_SYMBOL(scsi_register_driver);
771
772int scsi_register_interface(struct class_interface *intf)
773{
774 intf->class = &sdev_class;
775
776 return class_interface_register(intf);
777}
778EXPORT_SYMBOL(scsi_register_interface);
779
780
781static struct class_device_attribute *class_attr_overridden(
782 struct class_device_attribute **attrs,
783 struct class_device_attribute *attr)
784{
785 int i;
786
787 if (!attrs)
788 return NULL;
789 for (i = 0; attrs[i]; i++)
790 if (!strcmp(attrs[i]->attr.name, attr->attr.name))
791 return attrs[i];
792 return NULL;
793}
794
795static int class_attr_add(struct class_device *classdev,
796 struct class_device_attribute *attr)
797{
798 struct class_device_attribute *base_attr;
799
800 /*
801 * Spare the caller from having to copy things it's not interested in.
802 */
803 base_attr = class_attr_overridden(scsi_sysfs_shost_attrs, attr);
804 if (base_attr) {
805 /* extend permissions */
806 attr->attr.mode |= base_attr->attr.mode;
807
808 /* override null show/store with default */
809 if (!attr->show)
810 attr->show = base_attr->show;
811 if (!attr->store)
812 attr->store = base_attr->store;
813 }
814
815 return class_device_create_file(classdev, attr);
816}
817
818/**
819 * scsi_sysfs_add_host - add scsi host to subsystem
820 * @shost: scsi host struct to add to subsystem
821 * @dev: parent struct device pointer
822 **/
823int scsi_sysfs_add_host(struct Scsi_Host *shost)
824{
825 int error, i;
826
827 if (shost->hostt->shost_attrs) {
828 for (i = 0; shost->hostt->shost_attrs[i]; i++) {
829 error = class_attr_add(&shost->shost_classdev,
830 shost->hostt->shost_attrs[i]);
831 if (error)
832 return error;
833 }
834 }
835
836 for (i = 0; scsi_sysfs_shost_attrs[i]; i++) {
837 if (!class_attr_overridden(shost->hostt->shost_attrs,
838 scsi_sysfs_shost_attrs[i])) {
839 error = class_device_create_file(&shost->shost_classdev,
840 scsi_sysfs_shost_attrs[i]);
841 if (error)
842 return error;
843 }
844 }
845
846 transport_register_device(&shost->shost_gendev);
847 return 0;
848}
849
850void scsi_sysfs_device_initialize(struct scsi_device *sdev)
851{
852 unsigned long flags;
853 struct Scsi_Host *shost = sdev->host;
854 struct scsi_target *starget = sdev->sdev_target;
855
856 device_initialize(&sdev->sdev_gendev);
857 sdev->sdev_gendev.bus = &scsi_bus_type;
858 sdev->sdev_gendev.release = scsi_device_dev_release;
859 sprintf(sdev->sdev_gendev.bus_id,"%d:%d:%d:%d",
860 sdev->host->host_no, sdev->channel, sdev->id,
861 sdev->lun);
862
863 class_device_initialize(&sdev->sdev_classdev);
864 sdev->sdev_classdev.dev = &sdev->sdev_gendev;
865 sdev->sdev_classdev.class = &sdev_class;
866 snprintf(sdev->sdev_classdev.class_id, BUS_ID_SIZE,
867 "%d:%d:%d:%d", sdev->host->host_no,
868 sdev->channel, sdev->id, sdev->lun);
869 sdev->scsi_level = SCSI_2;
870 transport_setup_device(&sdev->sdev_gendev);
871 spin_lock_irqsave(shost->host_lock, flags);
872 list_add_tail(&sdev->same_target_siblings, &starget->devices);
873 list_add_tail(&sdev->siblings, &shost->__devices);
874 spin_unlock_irqrestore(shost->host_lock, flags);
875}
876
877int scsi_is_sdev_device(const struct device *dev)
878{
879 return dev->release == scsi_device_dev_release;
880}
881EXPORT_SYMBOL(scsi_is_sdev_device);
882
883/* A blank transport template that is used in drivers that don't
884 * yet implement Transport Attributes */
885struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };