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lockdep: Reintroduce generation count to make BFS faster
[linux-2.6.git] / drivers / scsi / ses.c
blob4f618f48735627c089b4d119ed85e7df03342b79
1 /*
2 * SCSI Enclosure Services
3 *
4 * Copyright (C) 2008 James Bottomley <James.Bottomley@HansenPartnership.com>
5 *
6 **-----------------------------------------------------------------------------
7 **
8 ** This program is free software; you can redistribute it and/or
9 ** modify it under the terms of the GNU General Public License
10 ** version 2 as published by the Free Software Foundation.
11 **
12 ** This program is distributed in the hope that it will be useful,
13 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
14 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 ** GNU General Public License for more details.
16 **
17 ** You should have received a copy of the GNU General Public License
18 ** along with this program; if not, write to the Free Software
19 ** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 **
21 **-----------------------------------------------------------------------------
22 */
23
24 #include <linux/module.h>
25 #include <linux/kernel.h>
26 #include <linux/enclosure.h>
27
28 #include <scsi/scsi.h>
29 #include <scsi/scsi_cmnd.h>
30 #include <scsi/scsi_dbg.h>
31 #include <scsi/scsi_device.h>
32 #include <scsi/scsi_driver.h>
33 #include <scsi/scsi_host.h>
34
35 struct ses_device {
36 unsigned char *page1;
37 unsigned char *page2;
38 unsigned char *page10;
39 short page1_len;
40 short page2_len;
41 short page10_len;
42 };
43
44 struct ses_component {
45 u64 addr;
46 unsigned char *desc;
47 };
48
49 static int ses_probe(struct device *dev)
50 {
51 struct scsi_device *sdev = to_scsi_device(dev);
52 int err = -ENODEV;
53
54 if (sdev->type != TYPE_ENCLOSURE)
55 goto out;
56
57 err = 0;
58 sdev_printk(KERN_NOTICE, sdev, "Attached Enclosure device\n");
59
60 out:
61 return err;
62 }
63
64 #define SES_TIMEOUT (30 * HZ)
65 #define SES_RETRIES 3
66
67 static int ses_recv_diag(struct scsi_device *sdev, int page_code,
68 void *buf, int bufflen)
69 {
70 unsigned char cmd[] = {
71 RECEIVE_DIAGNOSTIC,
72 1, /* Set PCV bit */
73 page_code,
74 bufflen >> 8,
75 bufflen & 0xff,
76 0
77 };
78
79 return scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, bufflen,
80 NULL, SES_TIMEOUT, SES_RETRIES, NULL);
81 }
82
83 static int ses_send_diag(struct scsi_device *sdev, int page_code,
84 void *buf, int bufflen)
85 {
86 u32 result;
87
88 unsigned char cmd[] = {
89 SEND_DIAGNOSTIC,
90 0x10, /* Set PF bit */
91 0,
92 bufflen >> 8,
93 bufflen & 0xff,
94 0
95 };
96
97 result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, buf, bufflen,
98 NULL, SES_TIMEOUT, SES_RETRIES, NULL);
99 if (result)
100 sdev_printk(KERN_ERR, sdev, "SEND DIAGNOSTIC result: %8x\n",
101 result);
102 return result;
103 }
104
105 static int ses_set_page2_descriptor(struct enclosure_device *edev,
106 struct enclosure_component *ecomp,
107 unsigned char *desc)
108 {
109 int i, j, count = 0, descriptor = ecomp->number;
110 struct scsi_device *sdev = to_scsi_device(edev->edev.parent);
111 struct ses_device *ses_dev = edev->scratch;
112 unsigned char *type_ptr = ses_dev->page1 + 12 + ses_dev->page1[11];
113 unsigned char *desc_ptr = ses_dev->page2 + 8;
114
115 /* Clear everything */
116 memset(desc_ptr, 0, ses_dev->page2_len - 8);
117 for (i = 0; i < ses_dev->page1[10]; i++, type_ptr += 4) {
118 for (j = 0; j < type_ptr[1]; j++) {
119 desc_ptr += 4;
120 if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
121 type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE)
122 continue;
123 if (count++ == descriptor) {
124 memcpy(desc_ptr, desc, 4);
125 /* set select */
126 desc_ptr[0] |= 0x80;
127 /* clear reserved, just in case */
128 desc_ptr[0] &= 0xf0;
129 }
130 }
131 }
132
133 return ses_send_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len);
134 }
135
136 static unsigned char *ses_get_page2_descriptor(struct enclosure_device *edev,
137 struct enclosure_component *ecomp)
138 {
139 int i, j, count = 0, descriptor = ecomp->number;
140 struct scsi_device *sdev = to_scsi_device(edev->edev.parent);
141 struct ses_device *ses_dev = edev->scratch;
142 unsigned char *type_ptr = ses_dev->page1 + 12 + ses_dev->page1[11];
143 unsigned char *desc_ptr = ses_dev->page2 + 8;
144
145 ses_recv_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len);
146
147 for (i = 0; i < ses_dev->page1[10]; i++, type_ptr += 4) {
148 for (j = 0; j < type_ptr[1]; j++) {
149 desc_ptr += 4;
150 if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
151 type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE)
152 continue;
153 if (count++ == descriptor)
154 return desc_ptr;
155 }
156 }
157 return NULL;
158 }
159
160 static void ses_get_fault(struct enclosure_device *edev,
161 struct enclosure_component *ecomp)
162 {
163 unsigned char *desc;
164
165 desc = ses_get_page2_descriptor(edev, ecomp);
166 if (desc)
167 ecomp->fault = (desc[3] & 0x60) >> 4;
168 }
169
170 static int ses_set_fault(struct enclosure_device *edev,
171 struct enclosure_component *ecomp,
172 enum enclosure_component_setting val)
173 {
174 unsigned char desc[4] = {0 };
175
176 switch (val) {
177 case ENCLOSURE_SETTING_DISABLED:
178 /* zero is disabled */
179 break;
180 case ENCLOSURE_SETTING_ENABLED:
181 desc[2] = 0x02;
182 break;
183 default:
184 /* SES doesn't do the SGPIO blink settings */
185 return -EINVAL;
186 }
187
188 return ses_set_page2_descriptor(edev, ecomp, desc);
189 }
190
191 static void ses_get_status(struct enclosure_device *edev,
192 struct enclosure_component *ecomp)
193 {
194 unsigned char *desc;
195
196 desc = ses_get_page2_descriptor(edev, ecomp);
197 if (desc)
198 ecomp->status = (desc[0] & 0x0f);
199 }
200
201 static void ses_get_locate(struct enclosure_device *edev,
202 struct enclosure_component *ecomp)
203 {
204 unsigned char *desc;
205
206 desc = ses_get_page2_descriptor(edev, ecomp);
207 if (desc)
208 ecomp->locate = (desc[2] & 0x02) ? 1 : 0;
209 }
210
211 static int ses_set_locate(struct enclosure_device *edev,
212 struct enclosure_component *ecomp,
213 enum enclosure_component_setting val)
214 {
215 unsigned char desc[4] = {0 };
216
217 switch (val) {
218 case ENCLOSURE_SETTING_DISABLED:
219 /* zero is disabled */
220 break;
221 case ENCLOSURE_SETTING_ENABLED:
222 desc[2] = 0x02;
223 break;
224 default:
225 /* SES doesn't do the SGPIO blink settings */
226 return -EINVAL;
227 }
228 return ses_set_page2_descriptor(edev, ecomp, desc);
229 }
230
231 static int ses_set_active(struct enclosure_device *edev,
232 struct enclosure_component *ecomp,
233 enum enclosure_component_setting val)
234 {
235 unsigned char desc[4] = {0 };
236
237 switch (val) {
238 case ENCLOSURE_SETTING_DISABLED:
239 /* zero is disabled */
240 ecomp->active = 0;
241 break;
242 case ENCLOSURE_SETTING_ENABLED:
243 desc[2] = 0x80;
244 ecomp->active = 1;
245 break;
246 default:
247 /* SES doesn't do the SGPIO blink settings */
248 return -EINVAL;
249 }
250 return ses_set_page2_descriptor(edev, ecomp, desc);
251 }
252
253 static struct enclosure_component_callbacks ses_enclosure_callbacks = {
254 .get_fault = ses_get_fault,
255 .set_fault = ses_set_fault,
256 .get_status = ses_get_status,
257 .get_locate = ses_get_locate,
258 .set_locate = ses_set_locate,
259 .set_active = ses_set_active,
260 };
261
262 struct ses_host_edev {
263 struct Scsi_Host *shost;
264 struct enclosure_device *edev;
265 };
266
267 #if 0
268 int ses_match_host(struct enclosure_device *edev, void *data)
269 {
270 struct ses_host_edev *sed = data;
271 struct scsi_device *sdev;
272
273 if (!scsi_is_sdev_device(edev->edev.parent))
274 return 0;
275
276 sdev = to_scsi_device(edev->edev.parent);
277
278 if (sdev->host != sed->shost)
279 return 0;
280
281 sed->edev = edev;
282 return 1;
283 }
284 #endif /* 0 */
285
286 static void ses_process_descriptor(struct enclosure_component *ecomp,
287 unsigned char *desc)
288 {
289 int eip = desc[0] & 0x10;
290 int invalid = desc[0] & 0x80;
291 enum scsi_protocol proto = desc[0] & 0x0f;
292 u64 addr = 0;
293 struct ses_component *scomp = ecomp->scratch;
294 unsigned char *d;
295
296 scomp->desc = desc;
297
298 if (invalid)
299 return;
300
301 switch (proto) {
302 case SCSI_PROTOCOL_SAS:
303 if (eip)
304 d = desc + 8;
305 else
306 d = desc + 4;
307 /* only take the phy0 addr */
308 addr = (u64)d[12] << 56 |
309 (u64)d[13] << 48 |
310 (u64)d[14] << 40 |
311 (u64)d[15] << 32 |
312 (u64)d[16] << 24 |
313 (u64)d[17] << 16 |
314 (u64)d[18] << 8 |
315 (u64)d[19];
316 break;
317 default:
318 /* FIXME: Need to add more protocols than just SAS */
319 break;
320 }
321 scomp->addr = addr;
322 }
323
324 struct efd {
325 u64 addr;
326 struct device *dev;
327 };
328
329 static int ses_enclosure_find_by_addr(struct enclosure_device *edev,
330 void *data)
331 {
332 struct efd *efd = data;
333 int i;
334 struct ses_component *scomp;
335
336 if (!edev->component[0].scratch)
337 return 0;
338
339 for (i = 0; i < edev->components; i++) {
340 scomp = edev->component[i].scratch;
341 if (scomp->addr != efd->addr)
342 continue;
343
344 enclosure_add_device(edev, i, efd->dev);
345 return 1;
346 }
347 return 0;
348 }
349
350 static void ses_match_to_enclosure(struct enclosure_device *edev,
351 struct scsi_device *sdev)
352 {
353 unsigned char *buf;
354 unsigned char *desc;
355 unsigned int vpd_len;
356 struct efd efd = {
357 .addr = 0,
358 };
359
360 buf = scsi_get_vpd_page(sdev, 0x83);
361 if (!buf)
362 return;
363
364 vpd_len = ((buf[2] << 8) | buf[3]) + 4;
365
366 desc = buf + 4;
367 while (desc < buf + vpd_len) {
368 enum scsi_protocol proto = desc[0] >> 4;
369 u8 code_set = desc[0] & 0x0f;
370 u8 piv = desc[1] & 0x80;
371 u8 assoc = (desc[1] & 0x30) >> 4;
372 u8 type = desc[1] & 0x0f;
373 u8 len = desc[3];
374
375 if (piv && code_set == 1 && assoc == 1
376 && proto == SCSI_PROTOCOL_SAS && type == 3 && len == 8)
377 efd.addr = (u64)desc[4] << 56 |
378 (u64)desc[5] << 48 |
379 (u64)desc[6] << 40 |
380 (u64)desc[7] << 32 |
381 (u64)desc[8] << 24 |
382 (u64)desc[9] << 16 |
383 (u64)desc[10] << 8 |
384 (u64)desc[11];
385
386 desc += len + 4;
387 }
388 if (!efd.addr)
389 goto free;
390
391 efd.dev = &sdev->sdev_gendev;
392
393 enclosure_for_each_device(ses_enclosure_find_by_addr, &efd);
394 free:
395 kfree(buf);
396 }
397
398 #define INIT_ALLOC_SIZE 32
399
400 static int ses_intf_add(struct device *cdev,
401 struct class_interface *intf)
402 {
403 struct scsi_device *sdev = to_scsi_device(cdev->parent);
404 struct scsi_device *tmp_sdev;
405 unsigned char *buf = NULL, *hdr_buf, *type_ptr, *desc_ptr = NULL,
406 *addl_desc_ptr = NULL;
407 struct ses_device *ses_dev;
408 u32 result;
409 int i, j, types, len, page7_len = 0, components = 0;
410 int err = -ENOMEM;
411 struct enclosure_device *edev;
412 struct ses_component *scomp = NULL;
413
414 if (!scsi_device_enclosure(sdev)) {
415 /* not an enclosure, but might be in one */
416 edev = enclosure_find(&sdev->host->shost_gendev);
417 if (edev) {
418 ses_match_to_enclosure(edev, sdev);
419 put_device(&edev->edev);
420 }
421 return -ENODEV;
422 }
423
424 /* TYPE_ENCLOSURE prints a message in probe */
425 if (sdev->type != TYPE_ENCLOSURE)
426 sdev_printk(KERN_NOTICE, sdev, "Embedded Enclosure Device\n");
427
428 ses_dev = kzalloc(sizeof(*ses_dev), GFP_KERNEL);
429 hdr_buf = kzalloc(INIT_ALLOC_SIZE, GFP_KERNEL);
430 if (!hdr_buf || !ses_dev)
431 goto err_init_free;
432
433 result = ses_recv_diag(sdev, 1, hdr_buf, INIT_ALLOC_SIZE);
434 if (result)
435 goto recv_failed;
436
437 if (hdr_buf[1] != 0) {
438 /* FIXME: need subenclosure support; I've just never
439 * seen a device with subenclosures and it makes the
440 * traversal routines more complex */
441 sdev_printk(KERN_ERR, sdev,
442 "FIXME driver has no support for subenclosures (%d)\n",
443 hdr_buf[1]);
444 goto err_free;
445 }
446
447 len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
448 buf = kzalloc(len, GFP_KERNEL);
449 if (!buf)
450 goto err_free;
451
452 result = ses_recv_diag(sdev, 1, buf, len);
453 if (result)
454 goto recv_failed;
455
456 types = buf[10];
457
458 type_ptr = buf + 12 + buf[11];
459
460 for (i = 0; i < types; i++, type_ptr += 4) {
461 if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
462 type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE)
463 components += type_ptr[1];
464 }
465 ses_dev->page1 = buf;
466 ses_dev->page1_len = len;
467 buf = NULL;
468
469 result = ses_recv_diag(sdev, 2, hdr_buf, INIT_ALLOC_SIZE);
470 if (result)
471 goto recv_failed;
472
473 len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
474 buf = kzalloc(len, GFP_KERNEL);
475 if (!buf)
476 goto err_free;
477
478 /* make sure getting page 2 actually works */
479 result = ses_recv_diag(sdev, 2, buf, len);
480 if (result)
481 goto recv_failed;
482 ses_dev->page2 = buf;
483 ses_dev->page2_len = len;
484 buf = NULL;
485
486 /* The additional information page --- allows us
487 * to match up the devices */
488 result = ses_recv_diag(sdev, 10, hdr_buf, INIT_ALLOC_SIZE);
489 if (!result) {
490
491 len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
492 buf = kzalloc(len, GFP_KERNEL);
493 if (!buf)
494 goto err_free;
495
496 result = ses_recv_diag(sdev, 10, buf, len);
497 if (result)
498 goto recv_failed;
499 ses_dev->page10 = buf;
500 ses_dev->page10_len = len;
501 buf = NULL;
502 }
503
504 scomp = kzalloc(sizeof(struct ses_component) * components, GFP_KERNEL);
505 if (!scomp)
506 goto err_free;
507
508 edev = enclosure_register(cdev->parent, dev_name(&sdev->sdev_gendev),
509 components, &ses_enclosure_callbacks);
510 if (IS_ERR(edev)) {
511 err = PTR_ERR(edev);
512 goto err_free;
513 }
514
515 edev->scratch = ses_dev;
516 for (i = 0; i < components; i++)
517 edev->component[i].scratch = scomp + i;
518
519 /* Page 7 for the descriptors is optional */
520 result = ses_recv_diag(sdev, 7, hdr_buf, INIT_ALLOC_SIZE);
521 if (result)
522 goto simple_populate;
523
524 page7_len = len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
525 /* add 1 for trailing '\0' we'll use */
526 buf = kzalloc(len + 1, GFP_KERNEL);
527 if (!buf)
528 goto simple_populate;
529 result = ses_recv_diag(sdev, 7, buf, len);
530 if (result) {
531 simple_populate:
532 kfree(buf);
533 buf = NULL;
534 desc_ptr = NULL;
535 addl_desc_ptr = NULL;
536 } else {
537 desc_ptr = buf + 8;
538 len = (desc_ptr[2] << 8) + desc_ptr[3];
539 /* skip past overall descriptor */
540 desc_ptr += len + 4;
541 if (ses_dev->page10)
542 addl_desc_ptr = ses_dev->page10 + 8;
543 }
544 type_ptr = ses_dev->page1 + 12 + ses_dev->page1[11];
545 components = 0;
546 for (i = 0; i < types; i++, type_ptr += 4) {
547 for (j = 0; j < type_ptr[1]; j++) {
548 char *name = NULL;
549 struct enclosure_component *ecomp;
550
551 if (desc_ptr) {
552 if (desc_ptr >= buf + page7_len) {
553 desc_ptr = NULL;
554 } else {
555 len = (desc_ptr[2] << 8) + desc_ptr[3];
556 desc_ptr += 4;
557 /* Add trailing zero - pushes into
558 * reserved space */
559 desc_ptr[len] = '\0';
560 name = desc_ptr;
561 }
562 }
563 if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
564 type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE) {
565
566 ecomp = enclosure_component_register(edev,
567 components++,
568 type_ptr[0],
569 name);
570
571 if (!IS_ERR(ecomp) && addl_desc_ptr)
572 ses_process_descriptor(ecomp,
573 addl_desc_ptr);
574 }
575 if (desc_ptr)
576 desc_ptr += len;
577
578 if (addl_desc_ptr)
579 addl_desc_ptr += addl_desc_ptr[1] + 2;
580
581 }
582 }
583 kfree(buf);
584 kfree(hdr_buf);
585
586 /* see if there are any devices matching before
587 * we found the enclosure */
588 shost_for_each_device(tmp_sdev, sdev->host) {
589 if (tmp_sdev->lun != 0 || scsi_device_enclosure(tmp_sdev))
590 continue;
591 ses_match_to_enclosure(edev, tmp_sdev);
592 }
593
594 return 0;
595
596 recv_failed:
597 sdev_printk(KERN_ERR, sdev, "Failed to get diagnostic page 0x%x\n",
598 result);
599 err = -ENODEV;
600 err_free:
601 kfree(buf);
602 kfree(scomp);
603 kfree(ses_dev->page10);
604 kfree(ses_dev->page2);
605 kfree(ses_dev->page1);
606 err_init_free:
607 kfree(ses_dev);
608 kfree(hdr_buf);
609 sdev_printk(KERN_ERR, sdev, "Failed to bind enclosure %d\n", err);
610 return err;
611 }
612
613 static int ses_remove(struct device *dev)
614 {
615 return 0;
616 }
617
618 static void ses_intf_remove(struct device *cdev,
619 struct class_interface *intf)
620 {
621 struct scsi_device *sdev = to_scsi_device(cdev->parent);
622 struct enclosure_device *edev;
623 struct ses_device *ses_dev;
624
625 if (!scsi_device_enclosure(sdev))
626 return;
627
628 edev = enclosure_find(cdev->parent);
629 if (!edev)
630 return;
631
632 ses_dev = edev->scratch;
633 edev->scratch = NULL;
634
635 kfree(ses_dev->page10);
636 kfree(ses_dev->page1);
637 kfree(ses_dev->page2);
638 kfree(ses_dev);
639
640 kfree(edev->component[0].scratch);
641
642 put_device(&edev->edev);
643 enclosure_unregister(edev);
644 }
645
646 static struct class_interface ses_interface = {
647 .add_dev = ses_intf_add,
648 .remove_dev = ses_intf_remove,
649 };
650
651 static struct scsi_driver ses_template = {
652 .owner = THIS_MODULE,
653 .gendrv = {
654 .name = "ses",
655 .probe = ses_probe,
656 .remove = ses_remove,
657 },
658 };
659
660 static int __init ses_init(void)
661 {
662 int err;
663
664 err = scsi_register_interface(&ses_interface);
665 if (err)
666 return err;
667
668 err = scsi_register_driver(&ses_template.gendrv);
669 if (err)
670 goto out_unreg;
671
672 return 0;
673
674 out_unreg:
675 scsi_unregister_interface(&ses_interface);
676 return err;
677 }
678
679 static void __exit ses_exit(void)
680 {
681 scsi_unregister_driver(&ses_template.gendrv);
682 scsi_unregister_interface(&ses_interface);
683 }
684
685 module_init(ses_init);
686 module_exit(ses_exit);
687
688 MODULE_ALIAS_SCSI_DEVICE(TYPE_ENCLOSURE);
689
690 MODULE_AUTHOR("James Bottomley");
691 MODULE_DESCRIPTION("SCSI Enclosure Services (ses) driver");
692 MODULE_LICENSE("GPL v2");
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