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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/slab.h>
25#include <linux/module.h>
26#include <linux/kernel.h>
27#include <linux/enclosure.h>
28
29#include <scsi/scsi.h>
30#include <scsi/scsi_cmnd.h>
31#include <scsi/scsi_dbg.h>
32#include <scsi/scsi_device.h>
33#include <scsi/scsi_driver.h>
34#include <scsi/scsi_host.h>
35
36struct ses_device {
37 unsigned char *page1;
38 unsigned char *page1_types;
39 unsigned char *page2;
40 unsigned char *page10;
41 short page1_len;
42 short page1_num_types;
43 short page2_len;
44 short page10_len;
45};
46
47struct ses_component {
48 u64 addr;
49 unsigned char *desc;
50};
51
52static int ses_probe(struct device *dev)
53{
54 struct scsi_device *sdev = to_scsi_device(dev);
55 int err = -ENODEV;
56
57 if (sdev->type != TYPE_ENCLOSURE)
58 goto out;
59
60 err = 0;
61 sdev_printk(KERN_NOTICE, sdev, "Attached Enclosure device\n");
62
63 out:
64 return err;
65}
66
67#define SES_TIMEOUT (30 * HZ)
68#define SES_RETRIES 3
69
70static int ses_recv_diag(struct scsi_device *sdev, int page_code,
71 void *buf, int bufflen)
72{
73 unsigned char cmd[] = {
74 RECEIVE_DIAGNOSTIC,
75 1, /* Set PCV bit */
76 page_code,
77 bufflen >> 8,
78 bufflen & 0xff,
79 0
80 };
81
82 return scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, bufflen,
83 NULL, SES_TIMEOUT, SES_RETRIES, NULL);
84}
85
86static int ses_send_diag(struct scsi_device *sdev, int page_code,
87 void *buf, int bufflen)
88{
89 u32 result;
90
91 unsigned char cmd[] = {
92 SEND_DIAGNOSTIC,
93 0x10, /* Set PF bit */
94 0,
95 bufflen >> 8,
96 bufflen & 0xff,
97 0
98 };
99
100 result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, buf, bufflen,
101 NULL, SES_TIMEOUT, SES_RETRIES, NULL);
102 if (result)
103 sdev_printk(KERN_ERR, sdev, "SEND DIAGNOSTIC result: %8x\n",
104 result);
105 return result;
106}
107
108static int ses_set_page2_descriptor(struct enclosure_device *edev,
109 struct enclosure_component *ecomp,
110 unsigned char *desc)
111{
112 int i, j, count = 0, descriptor = ecomp->number;
113 struct scsi_device *sdev = to_scsi_device(edev->edev.parent);
114 struct ses_device *ses_dev = edev->scratch;
115 unsigned char *type_ptr = ses_dev->page1_types;
116 unsigned char *desc_ptr = ses_dev->page2 + 8;
117
118 /* Clear everything */
119 memset(desc_ptr, 0, ses_dev->page2_len - 8);
120 for (i = 0; i < ses_dev->page1_num_types; i++, type_ptr += 4) {
121 for (j = 0; j < type_ptr[1]; j++) {
122 desc_ptr += 4;
123 if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
124 type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE)
125 continue;
126 if (count++ == descriptor) {
127 memcpy(desc_ptr, desc, 4);
128 /* set select */
129 desc_ptr[0] |= 0x80;
130 /* clear reserved, just in case */
131 desc_ptr[0] &= 0xf0;
132 }
133 }
134 }
135
136 return ses_send_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len);
137}
138
139static unsigned char *ses_get_page2_descriptor(struct enclosure_device *edev,
140 struct enclosure_component *ecomp)
141{
142 int i, j, count = 0, descriptor = ecomp->number;
143 struct scsi_device *sdev = to_scsi_device(edev->edev.parent);
144 struct ses_device *ses_dev = edev->scratch;
145 unsigned char *type_ptr = ses_dev->page1_types;
146 unsigned char *desc_ptr = ses_dev->page2 + 8;
147
148 ses_recv_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len);
149
150 for (i = 0; i < ses_dev->page1_num_types; i++, type_ptr += 4) {
151 for (j = 0; j < type_ptr[1]; j++) {
152 desc_ptr += 4;
153 if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
154 type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE)
155 continue;
156 if (count++ == descriptor)
157 return desc_ptr;
158 }
159 }
160 return NULL;
161}
162
163/* For device slot and array device slot elements, byte 3 bit 6
164 * is "fault sensed" while byte 3 bit 5 is "fault reqstd". As this
165 * code stands these bits are shifted 4 positions right so in
166 * sysfs they will appear as bits 2 and 1 respectively. Strange. */
167static void ses_get_fault(struct enclosure_device *edev,
168 struct enclosure_component *ecomp)
169{
170 unsigned char *desc;
171
172 desc = ses_get_page2_descriptor(edev, ecomp);
173 if (desc)
174 ecomp->fault = (desc[3] & 0x60) >> 4;
175}
176
177static int ses_set_fault(struct enclosure_device *edev,
178 struct enclosure_component *ecomp,
179 enum enclosure_component_setting val)
180{
181 unsigned char desc[4] = {0 };
182
183 switch (val) {
184 case ENCLOSURE_SETTING_DISABLED:
185 /* zero is disabled */
186 break;
187 case ENCLOSURE_SETTING_ENABLED:
188 desc[3] = 0x20;
189 break;
190 default:
191 /* SES doesn't do the SGPIO blink settings */
192 return -EINVAL;
193 }
194
195 return ses_set_page2_descriptor(edev, ecomp, desc);
196}
197
198static void ses_get_status(struct enclosure_device *edev,
199 struct enclosure_component *ecomp)
200{
201 unsigned char *desc;
202
203 desc = ses_get_page2_descriptor(edev, ecomp);
204 if (desc)
205 ecomp->status = (desc[0] & 0x0f);
206}
207
208static void ses_get_locate(struct enclosure_device *edev,
209 struct enclosure_component *ecomp)
210{
211 unsigned char *desc;
212
213 desc = ses_get_page2_descriptor(edev, ecomp);
214 if (desc)
215 ecomp->locate = (desc[2] & 0x02) ? 1 : 0;
216}
217
218static int ses_set_locate(struct enclosure_device *edev,
219 struct enclosure_component *ecomp,
220 enum enclosure_component_setting val)
221{
222 unsigned char desc[4] = {0 };
223
224 switch (val) {
225 case ENCLOSURE_SETTING_DISABLED:
226 /* zero is disabled */
227 break;
228 case ENCLOSURE_SETTING_ENABLED:
229 desc[2] = 0x02;
230 break;
231 default:
232 /* SES doesn't do the SGPIO blink settings */
233 return -EINVAL;
234 }
235 return ses_set_page2_descriptor(edev, ecomp, desc);
236}
237
238static int ses_set_active(struct enclosure_device *edev,
239 struct enclosure_component *ecomp,
240 enum enclosure_component_setting val)
241{
242 unsigned char desc[4] = {0 };
243
244 switch (val) {
245 case ENCLOSURE_SETTING_DISABLED:
246 /* zero is disabled */
247 ecomp->active = 0;
248 break;
249 case ENCLOSURE_SETTING_ENABLED:
250 desc[2] = 0x80;
251 ecomp->active = 1;
252 break;
253 default:
254 /* SES doesn't do the SGPIO blink settings */
255 return -EINVAL;
256 }
257 return ses_set_page2_descriptor(edev, ecomp, desc);
258}
259
260static struct enclosure_component_callbacks ses_enclosure_callbacks = {
261 .get_fault = ses_get_fault,
262 .set_fault = ses_set_fault,
263 .get_status = ses_get_status,
264 .get_locate = ses_get_locate,
265 .set_locate = ses_set_locate,
266 .set_active = ses_set_active,
267};
268
269struct ses_host_edev {
270 struct Scsi_Host *shost;
271 struct enclosure_device *edev;
272};
273
274#if 0
275int ses_match_host(struct enclosure_device *edev, void *data)
276{
277 struct ses_host_edev *sed = data;
278 struct scsi_device *sdev;
279
280 if (!scsi_is_sdev_device(edev->edev.parent))
281 return 0;
282
283 sdev = to_scsi_device(edev->edev.parent);
284
285 if (sdev->host != sed->shost)
286 return 0;
287
288 sed->edev = edev;
289 return 1;
290}
291#endif /* 0 */
292
293static void ses_process_descriptor(struct enclosure_component *ecomp,
294 unsigned char *desc)
295{
296 int eip = desc[0] & 0x10;
297 int invalid = desc[0] & 0x80;
298 enum scsi_protocol proto = desc[0] & 0x0f;
299 u64 addr = 0;
300 struct ses_component *scomp = ecomp->scratch;
301 unsigned char *d;
302
303 scomp->desc = desc;
304
305 if (invalid)
306 return;
307
308 switch (proto) {
309 case SCSI_PROTOCOL_SAS:
310 if (eip)
311 d = desc + 8;
312 else
313 d = desc + 4;
314 /* only take the phy0 addr */
315 addr = (u64)d[12] << 56 |
316 (u64)d[13] << 48 |
317 (u64)d[14] << 40 |
318 (u64)d[15] << 32 |
319 (u64)d[16] << 24 |
320 (u64)d[17] << 16 |
321 (u64)d[18] << 8 |
322 (u64)d[19];
323 break;
324 default:
325 /* FIXME: Need to add more protocols than just SAS */
326 break;
327 }
328 scomp->addr = addr;
329}
330
331struct efd {
332 u64 addr;
333 struct device *dev;
334};
335
336static int ses_enclosure_find_by_addr(struct enclosure_device *edev,
337 void *data)
338{
339 struct efd *efd = data;
340 int i;
341 struct ses_component *scomp;
342
343 if (!edev->component[0].scratch)
344 return 0;
345
346 for (i = 0; i < edev->components; i++) {
347 scomp = edev->component[i].scratch;
348 if (scomp->addr != efd->addr)
349 continue;
350
351 enclosure_add_device(edev, i, efd->dev);
352 return 1;
353 }
354 return 0;
355}
356
357#define INIT_ALLOC_SIZE 32
358
359static void ses_enclosure_data_process(struct enclosure_device *edev,
360 struct scsi_device *sdev,
361 int create)
362{
363 u32 result;
364 unsigned char *buf = NULL, *type_ptr, *desc_ptr, *addl_desc_ptr = NULL;
365 int i, j, page7_len, len, components;
366 struct ses_device *ses_dev = edev->scratch;
367 int types = ses_dev->page1_num_types;
368 unsigned char *hdr_buf = kzalloc(INIT_ALLOC_SIZE, GFP_KERNEL);
369
370 if (!hdr_buf)
371 goto simple_populate;
372
373 /* re-read page 10 */
374 if (ses_dev->page10)
375 ses_recv_diag(sdev, 10, ses_dev->page10, ses_dev->page10_len);
376 /* Page 7 for the descriptors is optional */
377 result = ses_recv_diag(sdev, 7, hdr_buf, INIT_ALLOC_SIZE);
378 if (result)
379 goto simple_populate;
380
381 page7_len = len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
382 /* add 1 for trailing '\0' we'll use */
383 buf = kzalloc(len + 1, GFP_KERNEL);
384 if (!buf)
385 goto simple_populate;
386 result = ses_recv_diag(sdev, 7, buf, len);
387 if (result) {
388 simple_populate:
389 kfree(buf);
390 buf = NULL;
391 desc_ptr = NULL;
392 len = 0;
393 page7_len = 0;
394 } else {
395 desc_ptr = buf + 8;
396 len = (desc_ptr[2] << 8) + desc_ptr[3];
397 /* skip past overall descriptor */
398 desc_ptr += len + 4;
399 }
400 if (ses_dev->page10)
401 addl_desc_ptr = ses_dev->page10 + 8;
402 type_ptr = ses_dev->page1_types;
403 components = 0;
404 for (i = 0; i < types; i++, type_ptr += 4) {
405 for (j = 0; j < type_ptr[1]; j++) {
406 char *name = NULL;
407 struct enclosure_component *ecomp;
408
409 if (desc_ptr) {
410 if (desc_ptr >= buf + page7_len) {
411 desc_ptr = NULL;
412 } else {
413 len = (desc_ptr[2] << 8) + desc_ptr[3];
414 desc_ptr += 4;
415 /* Add trailing zero - pushes into
416 * reserved space */
417 desc_ptr[len] = '\0';
418 name = desc_ptr;
419 }
420 }
421 if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
422 type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE) {
423
424 if (create)
425 ecomp = enclosure_component_register(edev,
426 components++,
427 type_ptr[0],
428 name);
429 else
430 ecomp = &edev->component[components++];
431
432 if (!IS_ERR(ecomp) && addl_desc_ptr)
433 ses_process_descriptor(ecomp,
434 addl_desc_ptr);
435 }
436 if (desc_ptr)
437 desc_ptr += len;
438
439 if (addl_desc_ptr)
440 addl_desc_ptr += addl_desc_ptr[1] + 2;
441
442 }
443 }
444 kfree(buf);
445 kfree(hdr_buf);
446}
447
448static void ses_match_to_enclosure(struct enclosure_device *edev,
449 struct scsi_device *sdev)
450{
451 unsigned char *buf;
452 unsigned char *desc;
453 unsigned int vpd_len;
454 struct efd efd = {
455 .addr = 0,
456 };
457
458 buf = kmalloc(INIT_ALLOC_SIZE, GFP_KERNEL);
459 if (!buf || scsi_get_vpd_page(sdev, 0x83, buf, INIT_ALLOC_SIZE))
460 goto free;
461
462 ses_enclosure_data_process(edev, to_scsi_device(edev->edev.parent), 0);
463
464 vpd_len = ((buf[2] << 8) | buf[3]) + 4;
465 kfree(buf);
466 buf = kmalloc(vpd_len, GFP_KERNEL);
467 if (!buf ||scsi_get_vpd_page(sdev, 0x83, buf, vpd_len))
468 goto free;
469
470 desc = buf + 4;
471 while (desc < buf + vpd_len) {
472 enum scsi_protocol proto = desc[0] >> 4;
473 u8 code_set = desc[0] & 0x0f;
474 u8 piv = desc[1] & 0x80;
475 u8 assoc = (desc[1] & 0x30) >> 4;
476 u8 type = desc[1] & 0x0f;
477 u8 len = desc[3];
478
479 if (piv && code_set == 1 && assoc == 1
480 && proto == SCSI_PROTOCOL_SAS && type == 3 && len == 8)
481 efd.addr = (u64)desc[4] << 56 |
482 (u64)desc[5] << 48 |
483 (u64)desc[6] << 40 |
484 (u64)desc[7] << 32 |
485 (u64)desc[8] << 24 |
486 (u64)desc[9] << 16 |
487 (u64)desc[10] << 8 |
488 (u64)desc[11];
489
490 desc += len + 4;
491 }
492 if (!efd.addr)
493 goto free;
494
495 efd.dev = &sdev->sdev_gendev;
496
497 enclosure_for_each_device(ses_enclosure_find_by_addr, &efd);
498 free:
499 kfree(buf);
500}
501
502static int ses_intf_add(struct device *cdev,
503 struct class_interface *intf)
504{
505 struct scsi_device *sdev = to_scsi_device(cdev->parent);
506 struct scsi_device *tmp_sdev;
507 unsigned char *buf = NULL, *hdr_buf, *type_ptr;
508 struct ses_device *ses_dev;
509 u32 result;
510 int i, types, len, components = 0;
511 int err = -ENOMEM;
512 int num_enclosures;
513 struct enclosure_device *edev;
514 struct ses_component *scomp = NULL;
515
516 if (!scsi_device_enclosure(sdev)) {
517 /* not an enclosure, but might be in one */
518 struct enclosure_device *prev = NULL;
519
520 while ((edev = enclosure_find(&sdev->host->shost_gendev, prev)) != NULL) {
521 ses_match_to_enclosure(edev, sdev);
522 prev = edev;
523 }
524 return -ENODEV;
525 }
526
527 /* TYPE_ENCLOSURE prints a message in probe */
528 if (sdev->type != TYPE_ENCLOSURE)
529 sdev_printk(KERN_NOTICE, sdev, "Embedded Enclosure Device\n");
530
531 ses_dev = kzalloc(sizeof(*ses_dev), GFP_KERNEL);
532 hdr_buf = kzalloc(INIT_ALLOC_SIZE, GFP_KERNEL);
533 if (!hdr_buf || !ses_dev)
534 goto err_init_free;
535
536 result = ses_recv_diag(sdev, 1, hdr_buf, INIT_ALLOC_SIZE);
537 if (result)
538 goto recv_failed;
539
540 len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
541 buf = kzalloc(len, GFP_KERNEL);
542 if (!buf)
543 goto err_free;
544
545 result = ses_recv_diag(sdev, 1, buf, len);
546 if (result)
547 goto recv_failed;
548
549 types = 0;
550
551 /* we always have one main enclosure and the rest are referred
552 * to as secondary subenclosures */
553 num_enclosures = buf[1] + 1;
554
555 /* begin at the enclosure descriptor */
556 type_ptr = buf + 8;
557 /* skip all the enclosure descriptors */
558 for (i = 0; i < num_enclosures && type_ptr < buf + len; i++) {
559 types += type_ptr[2];
560 type_ptr += type_ptr[3] + 4;
561 }
562
563 ses_dev->page1_types = type_ptr;
564 ses_dev->page1_num_types = types;
565
566 for (i = 0; i < types && type_ptr < buf + len; i++, type_ptr += 4) {
567 if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
568 type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE)
569 components += type_ptr[1];
570 }
571 ses_dev->page1 = buf;
572 ses_dev->page1_len = len;
573 buf = NULL;
574
575 result = ses_recv_diag(sdev, 2, hdr_buf, INIT_ALLOC_SIZE);
576 if (result)
577 goto recv_failed;
578
579 len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
580 buf = kzalloc(len, GFP_KERNEL);
581 if (!buf)
582 goto err_free;
583
584 /* make sure getting page 2 actually works */
585 result = ses_recv_diag(sdev, 2, buf, len);
586 if (result)
587 goto recv_failed;
588 ses_dev->page2 = buf;
589 ses_dev->page2_len = len;
590 buf = NULL;
591
592 /* The additional information page --- allows us
593 * to match up the devices */
594 result = ses_recv_diag(sdev, 10, hdr_buf, INIT_ALLOC_SIZE);
595 if (!result) {
596
597 len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
598 buf = kzalloc(len, GFP_KERNEL);
599 if (!buf)
600 goto err_free;
601
602 result = ses_recv_diag(sdev, 10, buf, len);
603 if (result)
604 goto recv_failed;
605 ses_dev->page10 = buf;
606 ses_dev->page10_len = len;
607 buf = NULL;
608 }
609 scomp = kzalloc(sizeof(struct ses_component) * components, GFP_KERNEL);
610 if (!scomp)
611 goto err_free;
612
613 edev = enclosure_register(cdev->parent, dev_name(&sdev->sdev_gendev),
614 components, &ses_enclosure_callbacks);
615 if (IS_ERR(edev)) {
616 err = PTR_ERR(edev);
617 goto err_free;
618 }
619
620 kfree(hdr_buf);
621
622 edev->scratch = ses_dev;
623 for (i = 0; i < components; i++)
624 edev->component[i].scratch = scomp + i;
625
626 ses_enclosure_data_process(edev, sdev, 1);
627
628 /* see if there are any devices matching before
629 * we found the enclosure */
630 shost_for_each_device(tmp_sdev, sdev->host) {
631 if (tmp_sdev->lun != 0 || scsi_device_enclosure(tmp_sdev))
632 continue;
633 ses_match_to_enclosure(edev, tmp_sdev);
634 }
635
636 return 0;
637
638 recv_failed:
639 sdev_printk(KERN_ERR, sdev, "Failed to get diagnostic page 0x%x\n",
640 result);
641 err = -ENODEV;
642 err_free:
643 kfree(buf);
644 kfree(scomp);
645 kfree(ses_dev->page10);
646 kfree(ses_dev->page2);
647 kfree(ses_dev->page1);
648 err_init_free:
649 kfree(ses_dev);
650 kfree(hdr_buf);
651 sdev_printk(KERN_ERR, sdev, "Failed to bind enclosure %d\n", err);
652 return err;
653}
654
655static int ses_remove(struct device *dev)
656{
657 return 0;
658}
659
660static void ses_intf_remove_component(struct scsi_device *sdev)
661{
662 struct enclosure_device *edev, *prev = NULL;
663
664 while ((edev = enclosure_find(&sdev->host->shost_gendev, prev)) != NULL) {
665 prev = edev;
666 if (!enclosure_remove_device(edev, &sdev->sdev_gendev))
667 break;
668 }
669 if (edev)
670 put_device(&edev->edev);
671}
672
673static void ses_intf_remove_enclosure(struct scsi_device *sdev)
674{
675 struct enclosure_device *edev;
676 struct ses_device *ses_dev;
677
678 /* exact match to this enclosure */
679 edev = enclosure_find(&sdev->sdev_gendev, NULL);
680 if (!edev)
681 return;
682
683 ses_dev = edev->scratch;
684 edev->scratch = NULL;
685
686 kfree(ses_dev->page10);
687 kfree(ses_dev->page1);
688 kfree(ses_dev->page2);
689 kfree(ses_dev);
690
691 kfree(edev->component[0].scratch);
692
693 put_device(&edev->edev);
694 enclosure_unregister(edev);
695}
696
697static void ses_intf_remove(struct device *cdev,
698 struct class_interface *intf)
699{
700 struct scsi_device *sdev = to_scsi_device(cdev->parent);
701
702 if (!scsi_device_enclosure(sdev))
703 ses_intf_remove_component(sdev);
704 else
705 ses_intf_remove_enclosure(sdev);
706}
707
708static struct class_interface ses_interface = {
709 .add_dev = ses_intf_add,
710 .remove_dev = ses_intf_remove,
711};
712
713static struct scsi_driver ses_template = {
714 .owner = THIS_MODULE,
715 .gendrv = {
716 .name = "ses",
717 .probe = ses_probe,
718 .remove = ses_remove,
719 },
720};
721
722static int __init ses_init(void)
723{
724 int err;
725
726 err = scsi_register_interface(&ses_interface);
727 if (err)
728 return err;
729
730 err = scsi_register_driver(&ses_template.gendrv);
731 if (err)
732 goto out_unreg;
733
734 return 0;
735
736 out_unreg:
737 scsi_unregister_interface(&ses_interface);
738 return err;
739}
740
741static void __exit ses_exit(void)
742{
743 scsi_unregister_driver(&ses_template.gendrv);
744 scsi_unregister_interface(&ses_interface);
745}
746
747module_init(ses_init);
748module_exit(ses_exit);
749
750MODULE_ALIAS_SCSI_DEVICE(TYPE_ENCLOSURE);
751
752MODULE_AUTHOR("James Bottomley");
753MODULE_DESCRIPTION("SCSI Enclosure Services (ses) driver");
754MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * SCSI Enclosure Services
4 *
5 * Copyright (C) 2008 James Bottomley <James.Bottomley@HansenPartnership.com>
6 */
7
8#include <linux/slab.h>
9#include <linux/module.h>
10#include <linux/kernel.h>
11#include <linux/enclosure.h>
12#include <linux/unaligned.h>
13
14#include <scsi/scsi.h>
15#include <scsi/scsi_cmnd.h>
16#include <scsi/scsi_dbg.h>
17#include <scsi/scsi_device.h>
18#include <scsi/scsi_driver.h>
19#include <scsi/scsi_host.h>
20
21#include <scsi/scsi_transport_sas.h>
22
23struct ses_device {
24 unsigned char *page1;
25 unsigned char *page1_types;
26 unsigned char *page2;
27 unsigned char *page10;
28 short page1_len;
29 short page1_num_types;
30 short page2_len;
31 short page10_len;
32};
33
34struct ses_component {
35 u64 addr;
36};
37
38static bool ses_page2_supported(struct enclosure_device *edev)
39{
40 struct ses_device *ses_dev = edev->scratch;
41
42 return (ses_dev->page2 != NULL);
43}
44
45static int ses_probe(struct device *dev)
46{
47 struct scsi_device *sdev = to_scsi_device(dev);
48 int err = -ENODEV;
49
50 if (sdev->type != TYPE_ENCLOSURE)
51 goto out;
52
53 err = 0;
54 sdev_printk(KERN_NOTICE, sdev, "Attached Enclosure device\n");
55
56 out:
57 return err;
58}
59
60#define SES_TIMEOUT (30 * HZ)
61#define SES_RETRIES 3
62
63static void init_device_slot_control(unsigned char *dest_desc,
64 struct enclosure_component *ecomp,
65 unsigned char *status)
66{
67 memcpy(dest_desc, status, 4);
68 dest_desc[0] = 0;
69 /* only clear byte 1 for ENCLOSURE_COMPONENT_DEVICE */
70 if (ecomp->type == ENCLOSURE_COMPONENT_DEVICE)
71 dest_desc[1] = 0;
72 dest_desc[2] &= 0xde;
73 dest_desc[3] &= 0x3c;
74}
75
76
77static int ses_recv_diag(struct scsi_device *sdev, int page_code,
78 void *buf, int bufflen)
79{
80 int ret;
81 unsigned char cmd[] = {
82 RECEIVE_DIAGNOSTIC,
83 1, /* Set PCV bit */
84 page_code,
85 bufflen >> 8,
86 bufflen & 0xff,
87 0
88 };
89 unsigned char recv_page_code;
90 struct scsi_failure failure_defs[] = {
91 {
92 .sense = UNIT_ATTENTION,
93 .asc = 0x29,
94 .ascq = SCMD_FAILURE_ASCQ_ANY,
95 .allowed = SES_RETRIES,
96 .result = SAM_STAT_CHECK_CONDITION,
97 },
98 {
99 .sense = NOT_READY,
100 .asc = SCMD_FAILURE_ASC_ANY,
101 .ascq = SCMD_FAILURE_ASCQ_ANY,
102 .allowed = SES_RETRIES,
103 .result = SAM_STAT_CHECK_CONDITION,
104 },
105 {}
106 };
107 struct scsi_failures failures = {
108 .failure_definitions = failure_defs,
109 };
110 const struct scsi_exec_args exec_args = {
111 .failures = &failures,
112 };
113
114 ret = scsi_execute_cmd(sdev, cmd, REQ_OP_DRV_IN, buf, bufflen,
115 SES_TIMEOUT, 1, &exec_args);
116 if (unlikely(ret))
117 return ret;
118
119 recv_page_code = ((unsigned char *)buf)[0];
120
121 if (likely(recv_page_code == page_code))
122 return ret;
123
124 /* successful diagnostic but wrong page code. This happens to some
125 * USB devices, just print a message and pretend there was an error */
126
127 sdev_printk(KERN_ERR, sdev,
128 "Wrong diagnostic page; asked for %d got %u\n",
129 page_code, recv_page_code);
130
131 return -EINVAL;
132}
133
134static int ses_send_diag(struct scsi_device *sdev, int page_code,
135 void *buf, int bufflen)
136{
137 int result;
138
139 unsigned char cmd[] = {
140 SEND_DIAGNOSTIC,
141 0x10, /* Set PF bit */
142 0,
143 bufflen >> 8,
144 bufflen & 0xff,
145 0
146 };
147 struct scsi_failure failure_defs[] = {
148 {
149 .sense = UNIT_ATTENTION,
150 .asc = 0x29,
151 .ascq = SCMD_FAILURE_ASCQ_ANY,
152 .allowed = SES_RETRIES,
153 .result = SAM_STAT_CHECK_CONDITION,
154 },
155 {
156 .sense = NOT_READY,
157 .asc = SCMD_FAILURE_ASC_ANY,
158 .ascq = SCMD_FAILURE_ASCQ_ANY,
159 .allowed = SES_RETRIES,
160 .result = SAM_STAT_CHECK_CONDITION,
161 },
162 {}
163 };
164 struct scsi_failures failures = {
165 .failure_definitions = failure_defs,
166 };
167 const struct scsi_exec_args exec_args = {
168 .failures = &failures,
169 };
170
171 result = scsi_execute_cmd(sdev, cmd, REQ_OP_DRV_OUT, buf, bufflen,
172 SES_TIMEOUT, 1, &exec_args);
173 if (result)
174 sdev_printk(KERN_ERR, sdev, "SEND DIAGNOSTIC result: %8x\n",
175 result);
176 return result;
177}
178
179static int ses_set_page2_descriptor(struct enclosure_device *edev,
180 struct enclosure_component *ecomp,
181 unsigned char *desc)
182{
183 int i, j, count = 0, descriptor = ecomp->number;
184 struct scsi_device *sdev = to_scsi_device(edev->edev.parent);
185 struct ses_device *ses_dev = edev->scratch;
186 unsigned char *type_ptr = ses_dev->page1_types;
187 unsigned char *desc_ptr = ses_dev->page2 + 8;
188
189 /* Clear everything */
190 memset(desc_ptr, 0, ses_dev->page2_len - 8);
191 for (i = 0; i < ses_dev->page1_num_types; i++, type_ptr += 4) {
192 for (j = 0; j < type_ptr[1]; j++) {
193 desc_ptr += 4;
194 if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
195 type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE)
196 continue;
197 if (count++ == descriptor) {
198 memcpy(desc_ptr, desc, 4);
199 /* set select */
200 desc_ptr[0] |= 0x80;
201 /* clear reserved, just in case */
202 desc_ptr[0] &= 0xf0;
203 }
204 }
205 }
206
207 return ses_send_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len);
208}
209
210static unsigned char *ses_get_page2_descriptor(struct enclosure_device *edev,
211 struct enclosure_component *ecomp)
212{
213 int i, j, count = 0, descriptor = ecomp->number;
214 struct scsi_device *sdev = to_scsi_device(edev->edev.parent);
215 struct ses_device *ses_dev = edev->scratch;
216 unsigned char *type_ptr = ses_dev->page1_types;
217 unsigned char *desc_ptr = ses_dev->page2 + 8;
218
219 if (ses_recv_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len) < 0)
220 return NULL;
221
222 for (i = 0; i < ses_dev->page1_num_types; i++, type_ptr += 4) {
223 for (j = 0; j < type_ptr[1]; j++) {
224 desc_ptr += 4;
225 if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
226 type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE)
227 continue;
228 if (count++ == descriptor)
229 return desc_ptr;
230 }
231 }
232 return NULL;
233}
234
235/* For device slot and array device slot elements, byte 3 bit 6
236 * is "fault sensed" while byte 3 bit 5 is "fault reqstd". As this
237 * code stands these bits are shifted 4 positions right so in
238 * sysfs they will appear as bits 2 and 1 respectively. Strange. */
239static void ses_get_fault(struct enclosure_device *edev,
240 struct enclosure_component *ecomp)
241{
242 unsigned char *desc;
243
244 if (!ses_page2_supported(edev)) {
245 ecomp->fault = 0;
246 return;
247 }
248 desc = ses_get_page2_descriptor(edev, ecomp);
249 if (desc)
250 ecomp->fault = (desc[3] & 0x60) >> 4;
251}
252
253static int ses_set_fault(struct enclosure_device *edev,
254 struct enclosure_component *ecomp,
255 enum enclosure_component_setting val)
256{
257 unsigned char desc[4];
258 unsigned char *desc_ptr;
259
260 if (!ses_page2_supported(edev))
261 return -EINVAL;
262
263 desc_ptr = ses_get_page2_descriptor(edev, ecomp);
264
265 if (!desc_ptr)
266 return -EIO;
267
268 init_device_slot_control(desc, ecomp, desc_ptr);
269
270 switch (val) {
271 case ENCLOSURE_SETTING_DISABLED:
272 desc[3] &= 0xdf;
273 break;
274 case ENCLOSURE_SETTING_ENABLED:
275 desc[3] |= 0x20;
276 break;
277 default:
278 /* SES doesn't do the SGPIO blink settings */
279 return -EINVAL;
280 }
281
282 return ses_set_page2_descriptor(edev, ecomp, desc);
283}
284
285static void ses_get_status(struct enclosure_device *edev,
286 struct enclosure_component *ecomp)
287{
288 unsigned char *desc;
289
290 if (!ses_page2_supported(edev)) {
291 ecomp->status = 0;
292 return;
293 }
294 desc = ses_get_page2_descriptor(edev, ecomp);
295 if (desc)
296 ecomp->status = (desc[0] & 0x0f);
297}
298
299static void ses_get_locate(struct enclosure_device *edev,
300 struct enclosure_component *ecomp)
301{
302 unsigned char *desc;
303
304 if (!ses_page2_supported(edev)) {
305 ecomp->locate = 0;
306 return;
307 }
308 desc = ses_get_page2_descriptor(edev, ecomp);
309 if (desc)
310 ecomp->locate = (desc[2] & 0x02) ? 1 : 0;
311}
312
313static int ses_set_locate(struct enclosure_device *edev,
314 struct enclosure_component *ecomp,
315 enum enclosure_component_setting val)
316{
317 unsigned char desc[4];
318 unsigned char *desc_ptr;
319
320 if (!ses_page2_supported(edev))
321 return -EINVAL;
322
323 desc_ptr = ses_get_page2_descriptor(edev, ecomp);
324
325 if (!desc_ptr)
326 return -EIO;
327
328 init_device_slot_control(desc, ecomp, desc_ptr);
329
330 switch (val) {
331 case ENCLOSURE_SETTING_DISABLED:
332 desc[2] &= 0xfd;
333 break;
334 case ENCLOSURE_SETTING_ENABLED:
335 desc[2] |= 0x02;
336 break;
337 default:
338 /* SES doesn't do the SGPIO blink settings */
339 return -EINVAL;
340 }
341 return ses_set_page2_descriptor(edev, ecomp, desc);
342}
343
344static int ses_set_active(struct enclosure_device *edev,
345 struct enclosure_component *ecomp,
346 enum enclosure_component_setting val)
347{
348 unsigned char desc[4];
349 unsigned char *desc_ptr;
350
351 if (!ses_page2_supported(edev))
352 return -EINVAL;
353
354 desc_ptr = ses_get_page2_descriptor(edev, ecomp);
355
356 if (!desc_ptr)
357 return -EIO;
358
359 init_device_slot_control(desc, ecomp, desc_ptr);
360
361 switch (val) {
362 case ENCLOSURE_SETTING_DISABLED:
363 desc[2] &= 0x7f;
364 ecomp->active = 0;
365 break;
366 case ENCLOSURE_SETTING_ENABLED:
367 desc[2] |= 0x80;
368 ecomp->active = 1;
369 break;
370 default:
371 /* SES doesn't do the SGPIO blink settings */
372 return -EINVAL;
373 }
374 return ses_set_page2_descriptor(edev, ecomp, desc);
375}
376
377static int ses_show_id(struct enclosure_device *edev, char *buf)
378{
379 struct ses_device *ses_dev = edev->scratch;
380 unsigned long long id = get_unaligned_be64(ses_dev->page1+8+4);
381
382 return sprintf(buf, "%#llx\n", id);
383}
384
385static void ses_get_power_status(struct enclosure_device *edev,
386 struct enclosure_component *ecomp)
387{
388 unsigned char *desc;
389
390 if (!ses_page2_supported(edev)) {
391 ecomp->power_status = 0;
392 return;
393 }
394
395 desc = ses_get_page2_descriptor(edev, ecomp);
396 if (desc)
397 ecomp->power_status = (desc[3] & 0x10) ? 0 : 1;
398}
399
400static int ses_set_power_status(struct enclosure_device *edev,
401 struct enclosure_component *ecomp,
402 int val)
403{
404 unsigned char desc[4];
405 unsigned char *desc_ptr;
406
407 if (!ses_page2_supported(edev))
408 return -EINVAL;
409
410 desc_ptr = ses_get_page2_descriptor(edev, ecomp);
411
412 if (!desc_ptr)
413 return -EIO;
414
415 init_device_slot_control(desc, ecomp, desc_ptr);
416
417 switch (val) {
418 /* power = 1 is device_off = 0 and vice versa */
419 case 0:
420 desc[3] |= 0x10;
421 break;
422 case 1:
423 desc[3] &= 0xef;
424 break;
425 default:
426 return -EINVAL;
427 }
428 ecomp->power_status = val;
429 return ses_set_page2_descriptor(edev, ecomp, desc);
430}
431
432static struct enclosure_component_callbacks ses_enclosure_callbacks = {
433 .get_fault = ses_get_fault,
434 .set_fault = ses_set_fault,
435 .get_status = ses_get_status,
436 .get_locate = ses_get_locate,
437 .set_locate = ses_set_locate,
438 .get_power_status = ses_get_power_status,
439 .set_power_status = ses_set_power_status,
440 .set_active = ses_set_active,
441 .show_id = ses_show_id,
442};
443
444struct ses_host_edev {
445 struct Scsi_Host *shost;
446 struct enclosure_device *edev;
447};
448
449#if 0
450int ses_match_host(struct enclosure_device *edev, void *data)
451{
452 struct ses_host_edev *sed = data;
453 struct scsi_device *sdev;
454
455 if (!scsi_is_sdev_device(edev->edev.parent))
456 return 0;
457
458 sdev = to_scsi_device(edev->edev.parent);
459
460 if (sdev->host != sed->shost)
461 return 0;
462
463 sed->edev = edev;
464 return 1;
465}
466#endif /* 0 */
467
468static int ses_process_descriptor(struct enclosure_component *ecomp,
469 unsigned char *desc, int max_desc_len)
470{
471 int eip = desc[0] & 0x10;
472 int invalid = desc[0] & 0x80;
473 enum scsi_protocol proto = desc[0] & 0x0f;
474 u64 addr = 0;
475 int slot = -1;
476 struct ses_component *scomp = ecomp->scratch;
477 unsigned char *d;
478
479 if (invalid)
480 return 0;
481
482 switch (proto) {
483 case SCSI_PROTOCOL_FCP:
484 if (eip) {
485 if (max_desc_len <= 7)
486 return 1;
487 d = desc + 4;
488 slot = d[3];
489 }
490 break;
491 case SCSI_PROTOCOL_SAS:
492
493 if (eip) {
494 if (max_desc_len <= 27)
495 return 1;
496 d = desc + 4;
497 slot = d[3];
498 d = desc + 8;
499 } else {
500 if (max_desc_len <= 23)
501 return 1;
502 d = desc + 4;
503 }
504
505
506 /* only take the phy0 addr */
507 addr = (u64)d[12] << 56 |
508 (u64)d[13] << 48 |
509 (u64)d[14] << 40 |
510 (u64)d[15] << 32 |
511 (u64)d[16] << 24 |
512 (u64)d[17] << 16 |
513 (u64)d[18] << 8 |
514 (u64)d[19];
515 break;
516 default:
517 /* FIXME: Need to add more protocols than just SAS */
518 break;
519 }
520 ecomp->slot = slot;
521 scomp->addr = addr;
522
523 return 0;
524}
525
526struct efd {
527 u64 addr;
528 struct device *dev;
529};
530
531static int ses_enclosure_find_by_addr(struct enclosure_device *edev,
532 void *data)
533{
534 struct efd *efd = data;
535 int i;
536 struct ses_component *scomp;
537
538 for (i = 0; i < edev->components; i++) {
539 scomp = edev->component[i].scratch;
540 if (scomp->addr != efd->addr)
541 continue;
542
543 if (enclosure_add_device(edev, i, efd->dev) == 0)
544 kobject_uevent(&efd->dev->kobj, KOBJ_CHANGE);
545 return 1;
546 }
547 return 0;
548}
549
550#define INIT_ALLOC_SIZE 32
551
552static void ses_enclosure_data_process(struct enclosure_device *edev,
553 struct scsi_device *sdev,
554 int create)
555{
556 u32 result;
557 unsigned char *buf = NULL, *type_ptr, *desc_ptr, *addl_desc_ptr = NULL;
558 int i, j, page7_len, len, components;
559 struct ses_device *ses_dev = edev->scratch;
560 int types = ses_dev->page1_num_types;
561 unsigned char *hdr_buf = kzalloc(INIT_ALLOC_SIZE, GFP_KERNEL);
562
563 if (!hdr_buf)
564 goto simple_populate;
565
566 /* re-read page 10 */
567 if (ses_dev->page10)
568 ses_recv_diag(sdev, 10, ses_dev->page10, ses_dev->page10_len);
569 /* Page 7 for the descriptors is optional */
570 result = ses_recv_diag(sdev, 7, hdr_buf, INIT_ALLOC_SIZE);
571 if (result)
572 goto simple_populate;
573
574 page7_len = len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
575 /* add 1 for trailing '\0' we'll use */
576 buf = kzalloc(len + 1, GFP_KERNEL);
577 if (!buf)
578 goto simple_populate;
579 result = ses_recv_diag(sdev, 7, buf, len);
580 if (result) {
581 simple_populate:
582 kfree(buf);
583 buf = NULL;
584 desc_ptr = NULL;
585 len = 0;
586 page7_len = 0;
587 } else {
588 desc_ptr = buf + 8;
589 len = (desc_ptr[2] << 8) + desc_ptr[3];
590 /* skip past overall descriptor */
591 desc_ptr += len + 4;
592 }
593 if (ses_dev->page10 && ses_dev->page10_len > 9)
594 addl_desc_ptr = ses_dev->page10 + 8;
595 type_ptr = ses_dev->page1_types;
596 components = 0;
597 for (i = 0; i < types; i++, type_ptr += 4) {
598 for (j = 0; j < type_ptr[1]; j++) {
599 char *name = NULL;
600 struct enclosure_component *ecomp;
601 int max_desc_len;
602
603 if (desc_ptr) {
604 if (desc_ptr + 3 >= buf + page7_len) {
605 desc_ptr = NULL;
606 } else {
607 len = (desc_ptr[2] << 8) + desc_ptr[3];
608 desc_ptr += 4;
609 if (desc_ptr + len > buf + page7_len)
610 desc_ptr = NULL;
611 else {
612 /* Add trailing zero - pushes into
613 * reserved space */
614 desc_ptr[len] = '\0';
615 name = desc_ptr;
616 }
617 }
618 }
619 if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
620 type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE) {
621
622 if (create)
623 ecomp = enclosure_component_alloc(
624 edev,
625 components++,
626 type_ptr[0],
627 name);
628 else if (components < edev->components)
629 ecomp = &edev->component[components++];
630 else
631 ecomp = ERR_PTR(-EINVAL);
632
633 if (!IS_ERR(ecomp)) {
634 if (addl_desc_ptr) {
635 max_desc_len = ses_dev->page10_len -
636 (addl_desc_ptr - ses_dev->page10);
637 if (ses_process_descriptor(ecomp,
638 addl_desc_ptr,
639 max_desc_len))
640 addl_desc_ptr = NULL;
641 }
642 if (create)
643 enclosure_component_register(
644 ecomp);
645 }
646 }
647 if (desc_ptr)
648 desc_ptr += len;
649
650 if (addl_desc_ptr &&
651 /* only find additional descriptions for specific devices */
652 (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
653 type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE ||
654 type_ptr[0] == ENCLOSURE_COMPONENT_SAS_EXPANDER ||
655 /* these elements are optional */
656 type_ptr[0] == ENCLOSURE_COMPONENT_SCSI_TARGET_PORT ||
657 type_ptr[0] == ENCLOSURE_COMPONENT_SCSI_INITIATOR_PORT ||
658 type_ptr[0] == ENCLOSURE_COMPONENT_CONTROLLER_ELECTRONICS)) {
659 addl_desc_ptr += addl_desc_ptr[1] + 2;
660 if (addl_desc_ptr + 1 >= ses_dev->page10 + ses_dev->page10_len)
661 addl_desc_ptr = NULL;
662 }
663 }
664 }
665 kfree(buf);
666 kfree(hdr_buf);
667}
668
669static void ses_match_to_enclosure(struct enclosure_device *edev,
670 struct scsi_device *sdev,
671 int refresh)
672{
673 struct scsi_device *edev_sdev = to_scsi_device(edev->edev.parent);
674 struct efd efd = {
675 .addr = 0,
676 };
677
678 if (refresh)
679 ses_enclosure_data_process(edev, edev_sdev, 0);
680
681 if (scsi_is_sas_rphy(sdev->sdev_target->dev.parent))
682 efd.addr = sas_get_address(sdev);
683
684 if (efd.addr) {
685 efd.dev = &sdev->sdev_gendev;
686
687 enclosure_for_each_device(ses_enclosure_find_by_addr, &efd);
688 }
689}
690
691static int ses_intf_add(struct device *cdev)
692{
693 struct scsi_device *sdev = to_scsi_device(cdev->parent);
694 struct scsi_device *tmp_sdev;
695 unsigned char *buf = NULL, *hdr_buf, *type_ptr, page;
696 struct ses_device *ses_dev;
697 u32 result;
698 int i, types, len, components = 0;
699 int err = -ENOMEM;
700 int num_enclosures;
701 struct enclosure_device *edev;
702 struct ses_component *scomp = NULL;
703
704 if (!scsi_device_enclosure(sdev)) {
705 /* not an enclosure, but might be in one */
706 struct enclosure_device *prev = NULL;
707
708 while ((edev = enclosure_find(&sdev->host->shost_gendev, prev)) != NULL) {
709 ses_match_to_enclosure(edev, sdev, 1);
710 prev = edev;
711 }
712 return -ENODEV;
713 }
714
715 /* TYPE_ENCLOSURE prints a message in probe */
716 if (sdev->type != TYPE_ENCLOSURE)
717 sdev_printk(KERN_NOTICE, sdev, "Embedded Enclosure Device\n");
718
719 ses_dev = kzalloc(sizeof(*ses_dev), GFP_KERNEL);
720 hdr_buf = kzalloc(INIT_ALLOC_SIZE, GFP_KERNEL);
721 if (!hdr_buf || !ses_dev)
722 goto err_init_free;
723
724 page = 1;
725 result = ses_recv_diag(sdev, page, hdr_buf, INIT_ALLOC_SIZE);
726 if (result)
727 goto recv_failed;
728
729 len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
730 buf = kzalloc(len, GFP_KERNEL);
731 if (!buf)
732 goto err_free;
733
734 result = ses_recv_diag(sdev, page, buf, len);
735 if (result)
736 goto recv_failed;
737
738 types = 0;
739
740 /* we always have one main enclosure and the rest are referred
741 * to as secondary subenclosures */
742 num_enclosures = buf[1] + 1;
743
744 /* begin at the enclosure descriptor */
745 type_ptr = buf + 8;
746 /* skip all the enclosure descriptors */
747 for (i = 0; i < num_enclosures && type_ptr < buf + len; i++) {
748 types += type_ptr[2];
749 type_ptr += type_ptr[3] + 4;
750 }
751
752 ses_dev->page1_types = type_ptr;
753 ses_dev->page1_num_types = types;
754
755 for (i = 0; i < types && type_ptr < buf + len; i++, type_ptr += 4) {
756 if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
757 type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE)
758 components += type_ptr[1];
759 }
760
761 ses_dev->page1 = buf;
762 ses_dev->page1_len = len;
763 buf = NULL;
764
765 page = 2;
766 result = ses_recv_diag(sdev, page, hdr_buf, INIT_ALLOC_SIZE);
767 if (result)
768 goto page2_not_supported;
769
770 len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
771 buf = kzalloc(len, GFP_KERNEL);
772 if (!buf)
773 goto err_free;
774
775 /* make sure getting page 2 actually works */
776 result = ses_recv_diag(sdev, 2, buf, len);
777 if (result)
778 goto recv_failed;
779 ses_dev->page2 = buf;
780 ses_dev->page2_len = len;
781 buf = NULL;
782
783 /* The additional information page --- allows us
784 * to match up the devices */
785 page = 10;
786 result = ses_recv_diag(sdev, page, hdr_buf, INIT_ALLOC_SIZE);
787 if (!result) {
788
789 len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
790 buf = kzalloc(len, GFP_KERNEL);
791 if (!buf)
792 goto err_free;
793
794 result = ses_recv_diag(sdev, page, buf, len);
795 if (result)
796 goto recv_failed;
797 ses_dev->page10 = buf;
798 ses_dev->page10_len = len;
799 buf = NULL;
800 }
801page2_not_supported:
802 if (components > 0) {
803 scomp = kcalloc(components, sizeof(struct ses_component), GFP_KERNEL);
804 if (!scomp)
805 goto err_free;
806 }
807
808 edev = enclosure_register(cdev->parent, dev_name(&sdev->sdev_gendev),
809 components, &ses_enclosure_callbacks);
810 if (IS_ERR(edev)) {
811 err = PTR_ERR(edev);
812 goto err_free;
813 }
814
815 kfree(hdr_buf);
816
817 edev->scratch = ses_dev;
818 for (i = 0; i < components; i++)
819 edev->component[i].scratch = scomp + i;
820
821 ses_enclosure_data_process(edev, sdev, 1);
822
823 /* see if there are any devices matching before
824 * we found the enclosure */
825 shost_for_each_device(tmp_sdev, sdev->host) {
826 if (tmp_sdev->lun != 0 || scsi_device_enclosure(tmp_sdev))
827 continue;
828 ses_match_to_enclosure(edev, tmp_sdev, 0);
829 }
830
831 return 0;
832
833 recv_failed:
834 sdev_printk(KERN_ERR, sdev, "Failed to get diagnostic page 0x%x\n",
835 page);
836 err = -ENODEV;
837 err_free:
838 kfree(buf);
839 kfree(scomp);
840 kfree(ses_dev->page10);
841 kfree(ses_dev->page2);
842 kfree(ses_dev->page1);
843 err_init_free:
844 kfree(ses_dev);
845 kfree(hdr_buf);
846 sdev_printk(KERN_ERR, sdev, "Failed to bind enclosure %d\n", err);
847 return err;
848}
849
850static int ses_remove(struct device *dev)
851{
852 return 0;
853}
854
855static void ses_intf_remove_component(struct scsi_device *sdev)
856{
857 struct enclosure_device *edev, *prev = NULL;
858
859 while ((edev = enclosure_find(&sdev->host->shost_gendev, prev)) != NULL) {
860 prev = edev;
861 if (!enclosure_remove_device(edev, &sdev->sdev_gendev))
862 break;
863 }
864 if (edev)
865 put_device(&edev->edev);
866}
867
868static void ses_intf_remove_enclosure(struct scsi_device *sdev)
869{
870 struct enclosure_device *edev;
871 struct ses_device *ses_dev;
872
873 /* exact match to this enclosure */
874 edev = enclosure_find(&sdev->sdev_gendev, NULL);
875 if (!edev)
876 return;
877
878 ses_dev = edev->scratch;
879 edev->scratch = NULL;
880
881 kfree(ses_dev->page10);
882 kfree(ses_dev->page1);
883 kfree(ses_dev->page2);
884 kfree(ses_dev);
885
886 if (edev->components)
887 kfree(edev->component[0].scratch);
888
889 put_device(&edev->edev);
890 enclosure_unregister(edev);
891}
892
893static void ses_intf_remove(struct device *cdev)
894{
895 struct scsi_device *sdev = to_scsi_device(cdev->parent);
896
897 if (!scsi_device_enclosure(sdev))
898 ses_intf_remove_component(sdev);
899 else
900 ses_intf_remove_enclosure(sdev);
901}
902
903static struct class_interface ses_interface = {
904 .add_dev = ses_intf_add,
905 .remove_dev = ses_intf_remove,
906};
907
908static struct scsi_driver ses_template = {
909 .gendrv = {
910 .name = "ses",
911 .probe = ses_probe,
912 .remove = ses_remove,
913 },
914};
915
916static int __init ses_init(void)
917{
918 int err;
919
920 err = scsi_register_interface(&ses_interface);
921 if (err)
922 return err;
923
924 err = scsi_register_driver(&ses_template.gendrv);
925 if (err)
926 goto out_unreg;
927
928 return 0;
929
930 out_unreg:
931 scsi_unregister_interface(&ses_interface);
932 return err;
933}
934
935static void __exit ses_exit(void)
936{
937 scsi_unregister_driver(&ses_template.gendrv);
938 scsi_unregister_interface(&ses_interface);
939}
940
941module_init(ses_init);
942module_exit(ses_exit);
943
944MODULE_ALIAS_SCSI_DEVICE(TYPE_ENCLOSURE);
945
946MODULE_AUTHOR("James Bottomley");
947MODULE_DESCRIPTION("SCSI Enclosure Services (ses) driver");
948MODULE_LICENSE("GPL v2");