Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-2.6] / drivers / scsi / ses.c
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
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);
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);
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 int ses_match_host(struct enclosure_device *edev, void *data)
268 {
269         struct ses_host_edev *sed = data;
270         struct scsi_device *sdev;
271
272         if (!scsi_is_sdev_device(edev->edev.parent))
273                 return 0;
274
275         sdev = to_scsi_device(edev->edev.parent);
276
277         if (sdev->host != sed->shost)
278                 return 0;
279
280         sed->edev = edev;
281         return 1;
282 }
283
284 static void ses_process_descriptor(struct enclosure_component *ecomp,
285                                    unsigned char *desc)
286 {
287         int eip = desc[0] & 0x10;
288         int invalid = desc[0] & 0x80;
289         enum scsi_protocol proto = desc[0] & 0x0f;
290         u64 addr = 0;
291         struct ses_component *scomp = ecomp->scratch;
292         unsigned char *d;
293
294         scomp->desc = desc;
295
296         if (invalid)
297                 return;
298
299         switch (proto) {
300         case SCSI_PROTOCOL_SAS:
301                 if (eip)
302                         d = desc + 8;
303                 else
304                         d = desc + 4;
305                 /* only take the phy0 addr */
306                 addr = (u64)d[12] << 56 |
307                         (u64)d[13] << 48 |
308                         (u64)d[14] << 40 |
309                         (u64)d[15] << 32 |
310                         (u64)d[16] << 24 |
311                         (u64)d[17] << 16 |
312                         (u64)d[18] << 8 |
313                         (u64)d[19];
314                 break;
315         default:
316                 /* FIXME: Need to add more protocols than just SAS */
317                 break;
318         }
319         scomp->addr = addr;
320 }
321
322 struct efd {
323         u64 addr;
324         struct device *dev;
325 };
326
327 static int ses_enclosure_find_by_addr(struct enclosure_device *edev,
328                                       void *data)
329 {
330         struct efd *efd = data;
331         int i;
332         struct ses_component *scomp;
333
334         if (!edev->component[0].scratch)
335                 return 0;
336
337         for (i = 0; i < edev->components; i++) {
338                 scomp = edev->component[i].scratch;
339                 if (scomp->addr != efd->addr)
340                         continue;
341
342                 enclosure_add_device(edev, i, efd->dev);
343                 return 1;
344         }
345         return 0;
346 }
347
348 #define VPD_INQUIRY_SIZE 512
349
350 static void ses_match_to_enclosure(struct enclosure_device *edev,
351                                    struct scsi_device *sdev)
352 {
353         unsigned char *buf = kmalloc(VPD_INQUIRY_SIZE, GFP_KERNEL);
354         unsigned char *desc;
355         int len;
356         struct efd efd = {
357                 .addr = 0,
358         };
359         unsigned char cmd[] = {
360                 INQUIRY,
361                 1,
362                 0x83,
363                 VPD_INQUIRY_SIZE >> 8,
364                 VPD_INQUIRY_SIZE & 0xff,
365                 0
366         };
367
368         if (!buf)
369                 return;
370
371         if (scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf,
372                              VPD_INQUIRY_SIZE, NULL, SES_TIMEOUT, SES_RETRIES))
373                 goto free;
374
375         len = (buf[2] << 8) + buf[3];
376         desc = buf + 4;
377         while (desc < buf + len) {
378                 enum scsi_protocol proto = desc[0] >> 4;
379                 u8 code_set = desc[0] & 0x0f;
380                 u8 piv = desc[1] & 0x80;
381                 u8 assoc = (desc[1] & 0x30) >> 4;
382                 u8 type = desc[1] & 0x0f;
383                 u8 len = desc[3];
384
385                 if (piv && code_set == 1 && assoc == 1 && code_set == 1
386                     && proto == SCSI_PROTOCOL_SAS && type == 3 && len == 8)
387                         efd.addr = (u64)desc[4] << 56 |
388                                 (u64)desc[5] << 48 |
389                                 (u64)desc[6] << 40 |
390                                 (u64)desc[7] << 32 |
391                                 (u64)desc[8] << 24 |
392                                 (u64)desc[9] << 16 |
393                                 (u64)desc[10] << 8 |
394                                 (u64)desc[11];
395
396                 desc += len + 4;
397         }
398         if (!efd.addr)
399                 goto free;
400
401         efd.dev = &sdev->sdev_gendev;
402
403         enclosure_for_each_device(ses_enclosure_find_by_addr, &efd);
404  free:
405         kfree(buf);
406 }
407
408 #define INIT_ALLOC_SIZE 32
409
410 static int ses_intf_add(struct device *cdev,
411                         struct class_interface *intf)
412 {
413         struct scsi_device *sdev = to_scsi_device(cdev->parent);
414         struct scsi_device *tmp_sdev;
415         unsigned char *buf = NULL, *hdr_buf, *type_ptr, *desc_ptr = NULL,
416                 *addl_desc_ptr = NULL;
417         struct ses_device *ses_dev;
418         u32 result;
419         int i, j, types, len, page7_len = 0, components = 0;
420         int err = -ENOMEM;
421         struct enclosure_device *edev;
422         struct ses_component *scomp = NULL;
423
424         if (!scsi_device_enclosure(sdev)) {
425                 /* not an enclosure, but might be in one */
426                 edev = enclosure_find(&sdev->host->shost_gendev);
427                 if (edev) {
428                         ses_match_to_enclosure(edev, sdev);
429                         put_device(&edev->edev);
430                 }
431                 return -ENODEV;
432         }
433
434         /* TYPE_ENCLOSURE prints a message in probe */
435         if (sdev->type != TYPE_ENCLOSURE)
436                 sdev_printk(KERN_NOTICE, sdev, "Embedded Enclosure Device\n");
437
438         ses_dev = kzalloc(sizeof(*ses_dev), GFP_KERNEL);
439         hdr_buf = kzalloc(INIT_ALLOC_SIZE, GFP_KERNEL);
440         if (!hdr_buf || !ses_dev)
441                 goto err_init_free;
442
443         result = ses_recv_diag(sdev, 1, hdr_buf, INIT_ALLOC_SIZE);
444         if (result)
445                 goto recv_failed;
446
447         if (hdr_buf[1] != 0) {
448                 /* FIXME: need subenclosure support; I've just never
449                  * seen a device with subenclosures and it makes the
450                  * traversal routines more complex */
451                 sdev_printk(KERN_ERR, sdev,
452                         "FIXME driver has no support for subenclosures (%d)\n",
453                         hdr_buf[1]);
454                 goto err_free;
455         }
456
457         len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
458         buf = kzalloc(len, GFP_KERNEL);
459         if (!buf)
460                 goto err_free;
461
462         result = ses_recv_diag(sdev, 1, buf, len);
463         if (result)
464                 goto recv_failed;
465
466         types = buf[10];
467
468         type_ptr = buf + 12 + buf[11];
469
470         for (i = 0; i < types; i++, type_ptr += 4) {
471                 if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
472                     type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE)
473                         components += type_ptr[1];
474         }
475         ses_dev->page1 = buf;
476         ses_dev->page1_len = len;
477         buf = NULL;
478
479         result = ses_recv_diag(sdev, 2, hdr_buf, INIT_ALLOC_SIZE);
480         if (result)
481                 goto recv_failed;
482
483         len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
484         buf = kzalloc(len, GFP_KERNEL);
485         if (!buf)
486                 goto err_free;
487
488         /* make sure getting page 2 actually works */
489         result = ses_recv_diag(sdev, 2, buf, len);
490         if (result)
491                 goto recv_failed;
492         ses_dev->page2 = buf;
493         ses_dev->page2_len = len;
494         buf = NULL;
495
496         /* The additional information page --- allows us
497          * to match up the devices */
498         result = ses_recv_diag(sdev, 10, hdr_buf, INIT_ALLOC_SIZE);
499         if (!result) {
500
501                 len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
502                 buf = kzalloc(len, GFP_KERNEL);
503                 if (!buf)
504                         goto err_free;
505
506                 result = ses_recv_diag(sdev, 10, buf, len);
507                 if (result)
508                         goto recv_failed;
509                 ses_dev->page10 = buf;
510                 ses_dev->page10_len = len;
511                 buf = NULL;
512         }
513
514         scomp = kzalloc(sizeof(struct ses_component) * components, GFP_KERNEL);
515         if (!scomp)
516                 goto err_free;
517
518         edev = enclosure_register(cdev->parent, sdev->sdev_gendev.bus_id,
519                                   components, &ses_enclosure_callbacks);
520         if (IS_ERR(edev)) {
521                 err = PTR_ERR(edev);
522                 goto err_free;
523         }
524
525         edev->scratch = ses_dev;
526         for (i = 0; i < components; i++)
527                 edev->component[i].scratch = scomp + i;
528
529         /* Page 7 for the descriptors is optional */
530         result = ses_recv_diag(sdev, 7, hdr_buf, INIT_ALLOC_SIZE);
531         if (result)
532                 goto simple_populate;
533
534         page7_len = len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
535         /* add 1 for trailing '\0' we'll use */
536         buf = kzalloc(len + 1, GFP_KERNEL);
537         if (!buf)
538                 goto simple_populate;
539         result = ses_recv_diag(sdev, 7, buf, len);
540         if (result) {
541  simple_populate:
542                 kfree(buf);
543                 buf = NULL;
544                 desc_ptr = NULL;
545                 addl_desc_ptr = NULL;
546         } else {
547                 desc_ptr = buf + 8;
548                 len = (desc_ptr[2] << 8) + desc_ptr[3];
549                 /* skip past overall descriptor */
550                 desc_ptr += len + 4;
551                 if (ses_dev->page10)
552                         addl_desc_ptr = ses_dev->page10 + 8;
553         }
554         type_ptr = ses_dev->page1 + 12 + ses_dev->page1[11];
555         components = 0;
556         for (i = 0; i < types; i++, type_ptr += 4) {
557                 for (j = 0; j < type_ptr[1]; j++) {
558                         char *name = NULL;
559                         struct enclosure_component *ecomp;
560
561                         if (desc_ptr) {
562                                 if (desc_ptr >= buf + page7_len) {
563                                         desc_ptr = NULL;
564                                 } else {
565                                         len = (desc_ptr[2] << 8) + desc_ptr[3];
566                                         desc_ptr += 4;
567                                         /* Add trailing zero - pushes into
568                                          * reserved space */
569                                         desc_ptr[len] = '\0';
570                                         name = desc_ptr;
571                                 }
572                         }
573                         if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
574                             type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE) {
575
576                                 ecomp = enclosure_component_register(edev,
577                                                              components++,
578                                                              type_ptr[0],
579                                                              name);
580
581                                 if (!IS_ERR(ecomp) && addl_desc_ptr)
582                                         ses_process_descriptor(ecomp,
583                                                                addl_desc_ptr);
584                         }
585                         if (desc_ptr)
586                                 desc_ptr += len;
587
588                         if (addl_desc_ptr)
589                                 addl_desc_ptr += addl_desc_ptr[1] + 2;
590
591                 }
592         }
593         kfree(buf);
594         kfree(hdr_buf);
595
596         /* see if there are any devices matching before
597          * we found the enclosure */
598         shost_for_each_device(tmp_sdev, sdev->host) {
599                 if (tmp_sdev->lun != 0 || scsi_device_enclosure(tmp_sdev))
600                         continue;
601                 ses_match_to_enclosure(edev, tmp_sdev);
602         }
603
604         return 0;
605
606  recv_failed:
607         sdev_printk(KERN_ERR, sdev, "Failed to get diagnostic page 0x%x\n",
608                     result);
609         err = -ENODEV;
610  err_free:
611         kfree(buf);
612         kfree(scomp);
613         kfree(ses_dev->page10);
614         kfree(ses_dev->page2);
615         kfree(ses_dev->page1);
616  err_init_free:
617         kfree(ses_dev);
618         kfree(hdr_buf);
619         sdev_printk(KERN_ERR, sdev, "Failed to bind enclosure %d\n", err);
620         return err;
621 }
622
623 static int ses_remove(struct device *dev)
624 {
625         return 0;
626 }
627
628 static void ses_intf_remove(struct device *cdev,
629                             struct class_interface *intf)
630 {
631         struct scsi_device *sdev = to_scsi_device(cdev->parent);
632         struct enclosure_device *edev;
633         struct ses_device *ses_dev;
634
635         if (!scsi_device_enclosure(sdev))
636                 return;
637
638         edev = enclosure_find(cdev->parent);
639         if (!edev)
640                 return;
641
642         ses_dev = edev->scratch;
643         edev->scratch = NULL;
644
645         kfree(ses_dev->page10);
646         kfree(ses_dev->page1);
647         kfree(ses_dev->page2);
648         kfree(ses_dev);
649
650         kfree(edev->component[0].scratch);
651
652         put_device(&edev->edev);
653         enclosure_unregister(edev);
654 }
655
656 static struct class_interface ses_interface = {
657         .add_dev        = ses_intf_add,
658         .remove_dev     = ses_intf_remove,
659 };
660
661 static struct scsi_driver ses_template = {
662         .owner                  = THIS_MODULE,
663         .gendrv = {
664                 .name           = "ses",
665                 .probe          = ses_probe,
666                 .remove         = ses_remove,
667         },
668 };
669
670 static int __init ses_init(void)
671 {
672         int err;
673
674         err = scsi_register_interface(&ses_interface);
675         if (err)
676                 return err;
677
678         err = scsi_register_driver(&ses_template.gendrv);
679         if (err)
680                 goto out_unreg;
681
682         return 0;
683
684  out_unreg:
685         scsi_unregister_interface(&ses_interface);
686         return err;
687 }
688
689 static void __exit ses_exit(void)
690 {
691         scsi_unregister_driver(&ses_template.gendrv);
692         scsi_unregister_interface(&ses_interface);
693 }
694
695 module_init(ses_init);
696 module_exit(ses_exit);
697
698 MODULE_ALIAS_SCSI_DEVICE(TYPE_ENCLOSURE);
699
700 MODULE_AUTHOR("James Bottomley");
701 MODULE_DESCRIPTION("SCSI Enclosure Services (ses) driver");
702 MODULE_LICENSE("GPL v2");