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net/mlx5e: Make function mlx5e_change_rep_mtu() static
[linux-2.6/btrfs-unstable.git] / drivers / scsi / ses.c
blob62f04c0511cfe9cb95ccd1eb36e202fb11da6334
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 #include <asm/unaligned.h>
29
30 #include <scsi/scsi.h>
31 #include <scsi/scsi_cmnd.h>
32 #include <scsi/scsi_dbg.h>
33 #include <scsi/scsi_device.h>
34 #include <scsi/scsi_driver.h>
35 #include <scsi/scsi_host.h>
36
37 #include <scsi/scsi_transport_sas.h>
38
39 struct ses_device {
40 unsigned char *page1;
41 unsigned char *page1_types;
42 unsigned char *page2;
43 unsigned char *page10;
44 short page1_len;
45 short page1_num_types;
46 short page2_len;
47 short page10_len;
48 };
49
50 struct ses_component {
51 u64 addr;
52 };
53
54 static bool ses_page2_supported(struct enclosure_device *edev)
55 {
56 struct ses_device *ses_dev = edev->scratch;
57
58 return (ses_dev->page2 != NULL);
59 }
60
61 static int ses_probe(struct device *dev)
62 {
63 struct scsi_device *sdev = to_scsi_device(dev);
64 int err = -ENODEV;
65
66 if (sdev->type != TYPE_ENCLOSURE)
67 goto out;
68
69 err = 0;
70 sdev_printk(KERN_NOTICE, sdev, "Attached Enclosure device\n");
71
72 out:
73 return err;
74 }
75
76 #define SES_TIMEOUT (30 * HZ)
77 #define SES_RETRIES 3
78
79 static void init_device_slot_control(unsigned char *dest_desc,
80 struct enclosure_component *ecomp,
81 unsigned char *status)
82 {
83 memcpy(dest_desc, status, 4);
84 dest_desc[0] = 0;
85 /* only clear byte 1 for ENCLOSURE_COMPONENT_DEVICE */
86 if (ecomp->type == ENCLOSURE_COMPONENT_DEVICE)
87 dest_desc[1] = 0;
88 dest_desc[2] &= 0xde;
89 dest_desc[3] &= 0x3c;
90 }
91
92
93 static int ses_recv_diag(struct scsi_device *sdev, int page_code,
94 void *buf, int bufflen)
95 {
96 int ret;
97 unsigned char cmd[] = {
98 RECEIVE_DIAGNOSTIC,
99 1, /* Set PCV bit */
100 page_code,
101 bufflen >> 8,
102 bufflen & 0xff,
103 0
104 };
105 unsigned char recv_page_code;
106
107 ret = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, bufflen,
108 NULL, SES_TIMEOUT, SES_RETRIES, NULL);
109 if (unlikely(ret))
110 return ret;
111
112 recv_page_code = ((unsigned char *)buf)[0];
113
114 if (likely(recv_page_code == page_code))
115 return ret;
116
117 /* successful diagnostic but wrong page code. This happens to some
118 * USB devices, just print a message and pretend there was an error */
119
120 sdev_printk(KERN_ERR, sdev,
121 "Wrong diagnostic page; asked for %d got %u\n",
122 page_code, recv_page_code);
123
124 return -EINVAL;
125 }
126
127 static int ses_send_diag(struct scsi_device *sdev, int page_code,
128 void *buf, int bufflen)
129 {
130 u32 result;
131
132 unsigned char cmd[] = {
133 SEND_DIAGNOSTIC,
134 0x10, /* Set PF bit */
135 0,
136 bufflen >> 8,
137 bufflen & 0xff,
138 0
139 };
140
141 result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, buf, bufflen,
142 NULL, SES_TIMEOUT, SES_RETRIES, NULL);
143 if (result)
144 sdev_printk(KERN_ERR, sdev, "SEND DIAGNOSTIC result: %8x\n",
145 result);
146 return result;
147 }
148
149 static int ses_set_page2_descriptor(struct enclosure_device *edev,
150 struct enclosure_component *ecomp,
151 unsigned char *desc)
152 {
153 int i, j, count = 0, descriptor = ecomp->number;
154 struct scsi_device *sdev = to_scsi_device(edev->edev.parent);
155 struct ses_device *ses_dev = edev->scratch;
156 unsigned char *type_ptr = ses_dev->page1_types;
157 unsigned char *desc_ptr = ses_dev->page2 + 8;
158
159 /* Clear everything */
160 memset(desc_ptr, 0, ses_dev->page2_len - 8);
161 for (i = 0; i < ses_dev->page1_num_types; i++, type_ptr += 4) {
162 for (j = 0; j < type_ptr[1]; j++) {
163 desc_ptr += 4;
164 if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
165 type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE)
166 continue;
167 if (count++ == descriptor) {
168 memcpy(desc_ptr, desc, 4);
169 /* set select */
170 desc_ptr[0] |= 0x80;
171 /* clear reserved, just in case */
172 desc_ptr[0] &= 0xf0;
173 }
174 }
175 }
176
177 return ses_send_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len);
178 }
179
180 static unsigned char *ses_get_page2_descriptor(struct enclosure_device *edev,
181 struct enclosure_component *ecomp)
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 if (ses_recv_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len) < 0)
190 return NULL;
191
192 for (i = 0; i < ses_dev->page1_num_types; i++, type_ptr += 4) {
193 for (j = 0; j < type_ptr[1]; j++) {
194 desc_ptr += 4;
195 if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
196 type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE)
197 continue;
198 if (count++ == descriptor)
199 return desc_ptr;
200 }
201 }
202 return NULL;
203 }
204
205 /* For device slot and array device slot elements, byte 3 bit 6
206 * is "fault sensed" while byte 3 bit 5 is "fault reqstd". As this
207 * code stands these bits are shifted 4 positions right so in
208 * sysfs they will appear as bits 2 and 1 respectively. Strange. */
209 static void ses_get_fault(struct enclosure_device *edev,
210 struct enclosure_component *ecomp)
211 {
212 unsigned char *desc;
213
214 if (!ses_page2_supported(edev)) {
215 ecomp->fault = 0;
216 return;
217 }
218 desc = ses_get_page2_descriptor(edev, ecomp);
219 if (desc)
220 ecomp->fault = (desc[3] & 0x60) >> 4;
221 }
222
223 static int ses_set_fault(struct enclosure_device *edev,
224 struct enclosure_component *ecomp,
225 enum enclosure_component_setting val)
226 {
227 unsigned char desc[4];
228 unsigned char *desc_ptr;
229
230 if (!ses_page2_supported(edev))
231 return -EINVAL;
232
233 desc_ptr = ses_get_page2_descriptor(edev, ecomp);
234
235 if (!desc_ptr)
236 return -EIO;
237
238 init_device_slot_control(desc, ecomp, desc_ptr);
239
240 switch (val) {
241 case ENCLOSURE_SETTING_DISABLED:
242 desc[3] &= 0xdf;
243 break;
244 case ENCLOSURE_SETTING_ENABLED:
245 desc[3] |= 0x20;
246 break;
247 default:
248 /* SES doesn't do the SGPIO blink settings */
249 return -EINVAL;
250 }
251
252 return ses_set_page2_descriptor(edev, ecomp, desc);
253 }
254
255 static void ses_get_status(struct enclosure_device *edev,
256 struct enclosure_component *ecomp)
257 {
258 unsigned char *desc;
259
260 if (!ses_page2_supported(edev)) {
261 ecomp->status = 0;
262 return;
263 }
264 desc = ses_get_page2_descriptor(edev, ecomp);
265 if (desc)
266 ecomp->status = (desc[0] & 0x0f);
267 }
268
269 static void ses_get_locate(struct enclosure_device *edev,
270 struct enclosure_component *ecomp)
271 {
272 unsigned char *desc;
273
274 if (!ses_page2_supported(edev)) {
275 ecomp->locate = 0;
276 return;
277 }
278 desc = ses_get_page2_descriptor(edev, ecomp);
279 if (desc)
280 ecomp->locate = (desc[2] & 0x02) ? 1 : 0;
281 }
282
283 static int ses_set_locate(struct enclosure_device *edev,
284 struct enclosure_component *ecomp,
285 enum enclosure_component_setting val)
286 {
287 unsigned char desc[4];
288 unsigned char *desc_ptr;
289
290 if (!ses_page2_supported(edev))
291 return -EINVAL;
292
293 desc_ptr = ses_get_page2_descriptor(edev, ecomp);
294
295 if (!desc_ptr)
296 return -EIO;
297
298 init_device_slot_control(desc, ecomp, desc_ptr);
299
300 switch (val) {
301 case ENCLOSURE_SETTING_DISABLED:
302 desc[2] &= 0xfd;
303 break;
304 case ENCLOSURE_SETTING_ENABLED:
305 desc[2] |= 0x02;
306 break;
307 default:
308 /* SES doesn't do the SGPIO blink settings */
309 return -EINVAL;
310 }
311 return ses_set_page2_descriptor(edev, ecomp, desc);
312 }
313
314 static int ses_set_active(struct enclosure_device *edev,
315 struct enclosure_component *ecomp,
316 enum enclosure_component_setting val)
317 {
318 unsigned char desc[4];
319 unsigned char *desc_ptr;
320
321 if (!ses_page2_supported(edev))
322 return -EINVAL;
323
324 desc_ptr = ses_get_page2_descriptor(edev, ecomp);
325
326 if (!desc_ptr)
327 return -EIO;
328
329 init_device_slot_control(desc, ecomp, desc_ptr);
330
331 switch (val) {
332 case ENCLOSURE_SETTING_DISABLED:
333 desc[2] &= 0x7f;
334 ecomp->active = 0;
335 break;
336 case ENCLOSURE_SETTING_ENABLED:
337 desc[2] |= 0x80;
338 ecomp->active = 1;
339 break;
340 default:
341 /* SES doesn't do the SGPIO blink settings */
342 return -EINVAL;
343 }
344 return ses_set_page2_descriptor(edev, ecomp, desc);
345 }
346
347 static int ses_show_id(struct enclosure_device *edev, char *buf)
348 {
349 struct ses_device *ses_dev = edev->scratch;
350 unsigned long long id = get_unaligned_be64(ses_dev->page1+8+4);
351
352 return sprintf(buf, "%#llx\n", id);
353 }
354
355 static void ses_get_power_status(struct enclosure_device *edev,
356 struct enclosure_component *ecomp)
357 {
358 unsigned char *desc;
359
360 if (!ses_page2_supported(edev)) {
361 ecomp->power_status = 0;
362 return;
363 }
364
365 desc = ses_get_page2_descriptor(edev, ecomp);
366 if (desc)
367 ecomp->power_status = (desc[3] & 0x10) ? 0 : 1;
368 }
369
370 static int ses_set_power_status(struct enclosure_device *edev,
371 struct enclosure_component *ecomp,
372 int val)
373 {
374 unsigned char desc[4];
375 unsigned char *desc_ptr;
376
377 if (!ses_page2_supported(edev))
378 return -EINVAL;
379
380 desc_ptr = ses_get_page2_descriptor(edev, ecomp);
381
382 if (!desc_ptr)
383 return -EIO;
384
385 init_device_slot_control(desc, ecomp, desc_ptr);
386
387 switch (val) {
388 /* power = 1 is device_off = 0 and vice versa */
389 case 0:
390 desc[3] |= 0x10;
391 break;
392 case 1:
393 desc[3] &= 0xef;
394 break;
395 default:
396 return -EINVAL;
397 }
398 ecomp->power_status = val;
399 return ses_set_page2_descriptor(edev, ecomp, desc);
400 }
401
402 static struct enclosure_component_callbacks ses_enclosure_callbacks = {
403 .get_fault = ses_get_fault,
404 .set_fault = ses_set_fault,
405 .get_status = ses_get_status,
406 .get_locate = ses_get_locate,
407 .set_locate = ses_set_locate,
408 .get_power_status = ses_get_power_status,
409 .set_power_status = ses_set_power_status,
410 .set_active = ses_set_active,
411 .show_id = ses_show_id,
412 };
413
414 struct ses_host_edev {
415 struct Scsi_Host *shost;
416 struct enclosure_device *edev;
417 };
418
419 #if 0
420 int ses_match_host(struct enclosure_device *edev, void *data)
421 {
422 struct ses_host_edev *sed = data;
423 struct scsi_device *sdev;
424
425 if (!scsi_is_sdev_device(edev->edev.parent))
426 return 0;
427
428 sdev = to_scsi_device(edev->edev.parent);
429
430 if (sdev->host != sed->shost)
431 return 0;
432
433 sed->edev = edev;
434 return 1;
435 }
436 #endif /* 0 */
437
438 static void ses_process_descriptor(struct enclosure_component *ecomp,
439 unsigned char *desc)
440 {
441 int eip = desc[0] & 0x10;
442 int invalid = desc[0] & 0x80;
443 enum scsi_protocol proto = desc[0] & 0x0f;
444 u64 addr = 0;
445 int slot = -1;
446 struct ses_component *scomp = ecomp->scratch;
447 unsigned char *d;
448
449 if (invalid)
450 return;
451
452 switch (proto) {
453 case SCSI_PROTOCOL_FCP:
454 if (eip) {
455 d = desc + 4;
456 slot = d[3];
457 }
458 break;
459 case SCSI_PROTOCOL_SAS:
460 if (eip) {
461 d = desc + 4;
462 slot = d[3];
463 d = desc + 8;
464 } else
465 d = desc + 4;
466 /* only take the phy0 addr */
467 addr = (u64)d[12] << 56 |
468 (u64)d[13] << 48 |
469 (u64)d[14] << 40 |
470 (u64)d[15] << 32 |
471 (u64)d[16] << 24 |
472 (u64)d[17] << 16 |
473 (u64)d[18] << 8 |
474 (u64)d[19];
475 break;
476 default:
477 /* FIXME: Need to add more protocols than just SAS */
478 break;
479 }
480 ecomp->slot = slot;
481 scomp->addr = addr;
482 }
483
484 struct efd {
485 u64 addr;
486 struct device *dev;
487 };
488
489 static int ses_enclosure_find_by_addr(struct enclosure_device *edev,
490 void *data)
491 {
492 struct efd *efd = data;
493 int i;
494 struct ses_component *scomp;
495
496 if (!edev->component[0].scratch)
497 return 0;
498
499 for (i = 0; i < edev->components; i++) {
500 scomp = edev->component[i].scratch;
501 if (scomp->addr != efd->addr)
502 continue;
503
504 if (enclosure_add_device(edev, i, efd->dev) == 0)
505 kobject_uevent(&efd->dev->kobj, KOBJ_CHANGE);
506 return 1;
507 }
508 return 0;
509 }
510
511 #define INIT_ALLOC_SIZE 32
512
513 static void ses_enclosure_data_process(struct enclosure_device *edev,
514 struct scsi_device *sdev,
515 int create)
516 {
517 u32 result;
518 unsigned char *buf = NULL, *type_ptr, *desc_ptr, *addl_desc_ptr = NULL;
519 int i, j, page7_len, len, components;
520 struct ses_device *ses_dev = edev->scratch;
521 int types = ses_dev->page1_num_types;
522 unsigned char *hdr_buf = kzalloc(INIT_ALLOC_SIZE, GFP_KERNEL);
523
524 if (!hdr_buf)
525 goto simple_populate;
526
527 /* re-read page 10 */
528 if (ses_dev->page10)
529 ses_recv_diag(sdev, 10, ses_dev->page10, ses_dev->page10_len);
530 /* Page 7 for the descriptors is optional */
531 result = ses_recv_diag(sdev, 7, hdr_buf, INIT_ALLOC_SIZE);
532 if (result)
533 goto simple_populate;
534
535 page7_len = len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
536 /* add 1 for trailing '\0' we'll use */
537 buf = kzalloc(len + 1, GFP_KERNEL);
538 if (!buf)
539 goto simple_populate;
540 result = ses_recv_diag(sdev, 7, buf, len);
541 if (result) {
542 simple_populate:
543 kfree(buf);
544 buf = NULL;
545 desc_ptr = NULL;
546 len = 0;
547 page7_len = 0;
548 } else {
549 desc_ptr = buf + 8;
550 len = (desc_ptr[2] << 8) + desc_ptr[3];
551 /* skip past overall descriptor */
552 desc_ptr += len + 4;
553 }
554 if (ses_dev->page10)
555 addl_desc_ptr = ses_dev->page10 + 8;
556 type_ptr = ses_dev->page1_types;
557 components = 0;
558 for (i = 0; i < types; i++, type_ptr += 4) {
559 for (j = 0; j < type_ptr[1]; j++) {
560 char *name = NULL;
561 struct enclosure_component *ecomp;
562
563 if (desc_ptr) {
564 if (desc_ptr >= buf + page7_len) {
565 desc_ptr = NULL;
566 } else {
567 len = (desc_ptr[2] << 8) + desc_ptr[3];
568 desc_ptr += 4;
569 /* Add trailing zero - pushes into
570 * reserved space */
571 desc_ptr[len] = '\0';
572 name = desc_ptr;
573 }
574 }
575 if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
576 type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE) {
577
578 if (create)
579 ecomp = enclosure_component_alloc(
580 edev,
581 components++,
582 type_ptr[0],
583 name);
584 else
585 ecomp = &edev->component[components++];
586
587 if (!IS_ERR(ecomp)) {
588 if (addl_desc_ptr)
589 ses_process_descriptor(
590 ecomp,
591 addl_desc_ptr);
592 if (create)
593 enclosure_component_register(
594 ecomp);
595 }
596 }
597 if (desc_ptr)
598 desc_ptr += len;
599
600 if (addl_desc_ptr &&
601 /* only find additional descriptions for specific devices */
602 (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
603 type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE ||
604 type_ptr[0] == ENCLOSURE_COMPONENT_SAS_EXPANDER ||
605 /* these elements are optional */
606 type_ptr[0] == ENCLOSURE_COMPONENT_SCSI_TARGET_PORT ||
607 type_ptr[0] == ENCLOSURE_COMPONENT_SCSI_INITIATOR_PORT ||
608 type_ptr[0] == ENCLOSURE_COMPONENT_CONTROLLER_ELECTRONICS))
609 addl_desc_ptr += addl_desc_ptr[1] + 2;
610
611 }
612 }
613 kfree(buf);
614 kfree(hdr_buf);
615 }
616
617 static void ses_match_to_enclosure(struct enclosure_device *edev,
618 struct scsi_device *sdev,
619 int refresh)
620 {
621 struct scsi_device *edev_sdev = to_scsi_device(edev->edev.parent);
622 struct efd efd = {
623 .addr = 0,
624 };
625
626 if (refresh)
627 ses_enclosure_data_process(edev, edev_sdev, 0);
628
629 if (scsi_is_sas_rphy(sdev->sdev_target->dev.parent))
630 efd.addr = sas_get_address(sdev);
631
632 if (efd.addr) {
633 efd.dev = &sdev->sdev_gendev;
634
635 enclosure_for_each_device(ses_enclosure_find_by_addr, &efd);
636 }
637 }
638
639 static int ses_intf_add(struct device *cdev,
640 struct class_interface *intf)
641 {
642 struct scsi_device *sdev = to_scsi_device(cdev->parent);
643 struct scsi_device *tmp_sdev;
644 unsigned char *buf = NULL, *hdr_buf, *type_ptr, page;
645 struct ses_device *ses_dev;
646 u32 result;
647 int i, types, len, components = 0;
648 int err = -ENOMEM;
649 int num_enclosures;
650 struct enclosure_device *edev;
651 struct ses_component *scomp = NULL;
652
653 if (!scsi_device_enclosure(sdev)) {
654 /* not an enclosure, but might be in one */
655 struct enclosure_device *prev = NULL;
656
657 while ((edev = enclosure_find(&sdev->host->shost_gendev, prev)) != NULL) {
658 ses_match_to_enclosure(edev, sdev, 1);
659 prev = edev;
660 }
661 return -ENODEV;
662 }
663
664 /* TYPE_ENCLOSURE prints a message in probe */
665 if (sdev->type != TYPE_ENCLOSURE)
666 sdev_printk(KERN_NOTICE, sdev, "Embedded Enclosure Device\n");
667
668 ses_dev = kzalloc(sizeof(*ses_dev), GFP_KERNEL);
669 hdr_buf = kzalloc(INIT_ALLOC_SIZE, GFP_KERNEL);
670 if (!hdr_buf || !ses_dev)
671 goto err_init_free;
672
673 page = 1;
674 result = ses_recv_diag(sdev, page, hdr_buf, INIT_ALLOC_SIZE);
675 if (result)
676 goto recv_failed;
677
678 len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
679 buf = kzalloc(len, GFP_KERNEL);
680 if (!buf)
681 goto err_free;
682
683 result = ses_recv_diag(sdev, page, buf, len);
684 if (result)
685 goto recv_failed;
686
687 types = 0;
688
689 /* we always have one main enclosure and the rest are referred
690 * to as secondary subenclosures */
691 num_enclosures = buf[1] + 1;
692
693 /* begin at the enclosure descriptor */
694 type_ptr = buf + 8;
695 /* skip all the enclosure descriptors */
696 for (i = 0; i < num_enclosures && type_ptr < buf + len; i++) {
697 types += type_ptr[2];
698 type_ptr += type_ptr[3] + 4;
699 }
700
701 ses_dev->page1_types = type_ptr;
702 ses_dev->page1_num_types = types;
703
704 for (i = 0; i < types && type_ptr < buf + len; i++, type_ptr += 4) {
705 if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
706 type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE)
707 components += type_ptr[1];
708 }
709 ses_dev->page1 = buf;
710 ses_dev->page1_len = len;
711 buf = NULL;
712
713 page = 2;
714 result = ses_recv_diag(sdev, page, hdr_buf, INIT_ALLOC_SIZE);
715 if (result)
716 goto page2_not_supported;
717
718 len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
719 buf = kzalloc(len, GFP_KERNEL);
720 if (!buf)
721 goto err_free;
722
723 /* make sure getting page 2 actually works */
724 result = ses_recv_diag(sdev, 2, buf, len);
725 if (result)
726 goto recv_failed;
727 ses_dev->page2 = buf;
728 ses_dev->page2_len = len;
729 buf = NULL;
730
731 /* The additional information page --- allows us
732 * to match up the devices */
733 page = 10;
734 result = ses_recv_diag(sdev, page, hdr_buf, INIT_ALLOC_SIZE);
735 if (!result) {
736
737 len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
738 buf = kzalloc(len, GFP_KERNEL);
739 if (!buf)
740 goto err_free;
741
742 result = ses_recv_diag(sdev, page, buf, len);
743 if (result)
744 goto recv_failed;
745 ses_dev->page10 = buf;
746 ses_dev->page10_len = len;
747 buf = NULL;
748 }
749 page2_not_supported:
750 scomp = kzalloc(sizeof(struct ses_component) * components, GFP_KERNEL);
751 if (!scomp)
752 goto err_free;
753
754 edev = enclosure_register(cdev->parent, dev_name(&sdev->sdev_gendev),
755 components, &ses_enclosure_callbacks);
756 if (IS_ERR(edev)) {
757 err = PTR_ERR(edev);
758 goto err_free;
759 }
760
761 kfree(hdr_buf);
762
763 edev->scratch = ses_dev;
764 for (i = 0; i < components; i++)
765 edev->component[i].scratch = scomp + i;
766
767 ses_enclosure_data_process(edev, sdev, 1);
768
769 /* see if there are any devices matching before
770 * we found the enclosure */
771 shost_for_each_device(tmp_sdev, sdev->host) {
772 if (tmp_sdev->lun != 0 || scsi_device_enclosure(tmp_sdev))
773 continue;
774 ses_match_to_enclosure(edev, tmp_sdev, 0);
775 }
776
777 return 0;
778
779 recv_failed:
780 sdev_printk(KERN_ERR, sdev, "Failed to get diagnostic page 0x%x\n",
781 page);
782 err = -ENODEV;
783 err_free:
784 kfree(buf);
785 kfree(scomp);
786 kfree(ses_dev->page10);
787 kfree(ses_dev->page2);
788 kfree(ses_dev->page1);
789 err_init_free:
790 kfree(ses_dev);
791 kfree(hdr_buf);
792 sdev_printk(KERN_ERR, sdev, "Failed to bind enclosure %d\n", err);
793 return err;
794 }
795
796 static int ses_remove(struct device *dev)
797 {
798 return 0;
799 }
800
801 static void ses_intf_remove_component(struct scsi_device *sdev)
802 {
803 struct enclosure_device *edev, *prev = NULL;
804
805 while ((edev = enclosure_find(&sdev->host->shost_gendev, prev)) != NULL) {
806 prev = edev;
807 if (!enclosure_remove_device(edev, &sdev->sdev_gendev))
808 break;
809 }
810 if (edev)
811 put_device(&edev->edev);
812 }
813
814 static void ses_intf_remove_enclosure(struct scsi_device *sdev)
815 {
816 struct enclosure_device *edev;
817 struct ses_device *ses_dev;
818
819 /* exact match to this enclosure */
820 edev = enclosure_find(&sdev->sdev_gendev, NULL);
821 if (!edev)
822 return;
823
824 ses_dev = edev->scratch;
825 edev->scratch = NULL;
826
827 kfree(ses_dev->page10);
828 kfree(ses_dev->page1);
829 kfree(ses_dev->page2);
830 kfree(ses_dev);
831
832 kfree(edev->component[0].scratch);
833
834 put_device(&edev->edev);
835 enclosure_unregister(edev);
836 }
837
838 static void ses_intf_remove(struct device *cdev,
839 struct class_interface *intf)
840 {
841 struct scsi_device *sdev = to_scsi_device(cdev->parent);
842
843 if (!scsi_device_enclosure(sdev))
844 ses_intf_remove_component(sdev);
845 else
846 ses_intf_remove_enclosure(sdev);
847 }
848
849 static struct class_interface ses_interface = {
850 .add_dev = ses_intf_add,
851 .remove_dev = ses_intf_remove,
852 };
853
854 static struct scsi_driver ses_template = {
855 .gendrv = {
856 .name = "ses",
857 .owner = THIS_MODULE,
858 .probe = ses_probe,
859 .remove = ses_remove,
860 },
861 };
862
863 static int __init ses_init(void)
864 {
865 int err;
866
867 err = scsi_register_interface(&ses_interface);
868 if (err)
869 return err;
870
871 err = scsi_register_driver(&ses_template.gendrv);
872 if (err)
873 goto out_unreg;
874
875 return 0;
876
877 out_unreg:
878 scsi_unregister_interface(&ses_interface);
879 return err;
880 }
881
882 static void __exit ses_exit(void)
883 {
884 scsi_unregister_driver(&ses_template.gendrv);
885 scsi_unregister_interface(&ses_interface);
886 }
887
888 module_init(ses_init);
889 module_exit(ses_exit);
890
891 MODULE_ALIAS_SCSI_DEVICE(TYPE_ENCLOSURE);
892
893 MODULE_AUTHOR("James Bottomley");
894 MODULE_DESCRIPTION("SCSI Enclosure Services (ses) driver");
895 MODULE_LICENSE("GPL v2");
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