2 * SCSI Enclosure Services
4 * Copyright (C) 2008 James Bottomley <James.Bottomley@HansenPartnership.com>
6 **-----------------------------------------------------------------------------
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.
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.
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.
21 **-----------------------------------------------------------------------------
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>
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>
39 unsigned char *page1_types;
41 unsigned char *page10;
43 short page1_num_types;
48 struct ses_component {
52 static int ses_probe(struct device *dev)
54 struct scsi_device *sdev = to_scsi_device(dev);
57 if (sdev->type != TYPE_ENCLOSURE)
61 sdev_printk(KERN_NOTICE, sdev, "Attached Enclosure device\n");
67 #define SES_TIMEOUT (30 * HZ)
70 static void init_device_slot_control(unsigned char *dest_desc,
71 struct enclosure_component *ecomp,
72 unsigned char *status)
74 memcpy(dest_desc, status, 4);
76 /* only clear byte 1 for ENCLOSURE_COMPONENT_DEVICE */
77 if (ecomp->type == ENCLOSURE_COMPONENT_DEVICE)
84 static int ses_recv_diag(struct scsi_device *sdev, int page_code,
85 void *buf, int bufflen)
88 unsigned char cmd[] = {
96 unsigned char recv_page_code;
98 ret = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, bufflen,
99 NULL, SES_TIMEOUT, SES_RETRIES, NULL);
103 recv_page_code = ((unsigned char *)buf)[0];
105 if (likely(recv_page_code == page_code))
108 /* successful diagnostic but wrong page code. This happens to some
109 * USB devices, just print a message and pretend there was an error */
111 sdev_printk(KERN_ERR, sdev,
112 "Wrong diagnostic page; asked for %d got %u\n",
113 page_code, recv_page_code);
118 static int ses_send_diag(struct scsi_device *sdev, int page_code,
119 void *buf, int bufflen)
123 unsigned char cmd[] = {
125 0x10, /* Set PF bit */
132 result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, buf, bufflen,
133 NULL, SES_TIMEOUT, SES_RETRIES, NULL);
135 sdev_printk(KERN_ERR, sdev, "SEND DIAGNOSTIC result: %8x\n",
140 static int ses_set_page2_descriptor(struct enclosure_device *edev,
141 struct enclosure_component *ecomp,
144 int i, j, count = 0, descriptor = ecomp->number;
145 struct scsi_device *sdev = to_scsi_device(edev->edev.parent);
146 struct ses_device *ses_dev = edev->scratch;
147 unsigned char *type_ptr = ses_dev->page1_types;
148 unsigned char *desc_ptr = ses_dev->page2 + 8;
150 /* Clear everything */
151 memset(desc_ptr, 0, ses_dev->page2_len - 8);
152 for (i = 0; i < ses_dev->page1_num_types; i++, type_ptr += 4) {
153 for (j = 0; j < type_ptr[1]; j++) {
155 if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
156 type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE)
158 if (count++ == descriptor) {
159 memcpy(desc_ptr, desc, 4);
162 /* clear reserved, just in case */
168 return ses_send_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len);
171 static unsigned char *ses_get_page2_descriptor(struct enclosure_device *edev,
172 struct enclosure_component *ecomp)
174 int i, j, count = 0, descriptor = ecomp->number;
175 struct scsi_device *sdev = to_scsi_device(edev->edev.parent);
176 struct ses_device *ses_dev = edev->scratch;
177 unsigned char *type_ptr = ses_dev->page1_types;
178 unsigned char *desc_ptr = ses_dev->page2 + 8;
180 ses_recv_diag(sdev, 2, ses_dev->page2, ses_dev->page2_len);
182 for (i = 0; i < ses_dev->page1_num_types; i++, type_ptr += 4) {
183 for (j = 0; j < type_ptr[1]; j++) {
185 if (type_ptr[0] != ENCLOSURE_COMPONENT_DEVICE &&
186 type_ptr[0] != ENCLOSURE_COMPONENT_ARRAY_DEVICE)
188 if (count++ == descriptor)
195 /* For device slot and array device slot elements, byte 3 bit 6
196 * is "fault sensed" while byte 3 bit 5 is "fault reqstd". As this
197 * code stands these bits are shifted 4 positions right so in
198 * sysfs they will appear as bits 2 and 1 respectively. Strange. */
199 static void ses_get_fault(struct enclosure_device *edev,
200 struct enclosure_component *ecomp)
204 desc = ses_get_page2_descriptor(edev, ecomp);
206 ecomp->fault = (desc[3] & 0x60) >> 4;
209 static int ses_set_fault(struct enclosure_device *edev,
210 struct enclosure_component *ecomp,
211 enum enclosure_component_setting val)
213 unsigned char desc[4];
214 unsigned char *desc_ptr;
216 desc_ptr = ses_get_page2_descriptor(edev, ecomp);
221 init_device_slot_control(desc, ecomp, desc_ptr);
224 case ENCLOSURE_SETTING_DISABLED:
227 case ENCLOSURE_SETTING_ENABLED:
231 /* SES doesn't do the SGPIO blink settings */
235 return ses_set_page2_descriptor(edev, ecomp, desc);
238 static void ses_get_status(struct enclosure_device *edev,
239 struct enclosure_component *ecomp)
243 desc = ses_get_page2_descriptor(edev, ecomp);
245 ecomp->status = (desc[0] & 0x0f);
248 static void ses_get_locate(struct enclosure_device *edev,
249 struct enclosure_component *ecomp)
253 desc = ses_get_page2_descriptor(edev, ecomp);
255 ecomp->locate = (desc[2] & 0x02) ? 1 : 0;
258 static int ses_set_locate(struct enclosure_device *edev,
259 struct enclosure_component *ecomp,
260 enum enclosure_component_setting val)
262 unsigned char desc[4];
263 unsigned char *desc_ptr;
265 desc_ptr = ses_get_page2_descriptor(edev, ecomp);
270 init_device_slot_control(desc, ecomp, desc_ptr);
273 case ENCLOSURE_SETTING_DISABLED:
276 case ENCLOSURE_SETTING_ENABLED:
280 /* SES doesn't do the SGPIO blink settings */
283 return ses_set_page2_descriptor(edev, ecomp, desc);
286 static int ses_set_active(struct enclosure_device *edev,
287 struct enclosure_component *ecomp,
288 enum enclosure_component_setting val)
290 unsigned char desc[4];
291 unsigned char *desc_ptr;
293 desc_ptr = ses_get_page2_descriptor(edev, ecomp);
298 init_device_slot_control(desc, ecomp, desc_ptr);
301 case ENCLOSURE_SETTING_DISABLED:
305 case ENCLOSURE_SETTING_ENABLED:
310 /* SES doesn't do the SGPIO blink settings */
313 return ses_set_page2_descriptor(edev, ecomp, desc);
316 static int ses_show_id(struct enclosure_device *edev, char *buf)
318 struct ses_device *ses_dev = edev->scratch;
319 unsigned long long id = get_unaligned_be64(ses_dev->page1+8+4);
321 return sprintf(buf, "%#llx\n", id);
324 static void ses_get_power_status(struct enclosure_device *edev,
325 struct enclosure_component *ecomp)
329 desc = ses_get_page2_descriptor(edev, ecomp);
331 ecomp->power_status = (desc[3] & 0x10) ? 0 : 1;
334 static int ses_set_power_status(struct enclosure_device *edev,
335 struct enclosure_component *ecomp,
338 unsigned char desc[4];
339 unsigned char *desc_ptr;
341 desc_ptr = ses_get_page2_descriptor(edev, ecomp);
346 init_device_slot_control(desc, ecomp, desc_ptr);
349 /* power = 1 is device_off = 0 and vice versa */
359 ecomp->power_status = val;
360 return ses_set_page2_descriptor(edev, ecomp, desc);
363 static struct enclosure_component_callbacks ses_enclosure_callbacks = {
364 .get_fault = ses_get_fault,
365 .set_fault = ses_set_fault,
366 .get_status = ses_get_status,
367 .get_locate = ses_get_locate,
368 .set_locate = ses_set_locate,
369 .get_power_status = ses_get_power_status,
370 .set_power_status = ses_set_power_status,
371 .set_active = ses_set_active,
372 .show_id = ses_show_id,
375 struct ses_host_edev {
376 struct Scsi_Host *shost;
377 struct enclosure_device *edev;
381 int ses_match_host(struct enclosure_device *edev, void *data)
383 struct ses_host_edev *sed = data;
384 struct scsi_device *sdev;
386 if (!scsi_is_sdev_device(edev->edev.parent))
389 sdev = to_scsi_device(edev->edev.parent);
391 if (sdev->host != sed->shost)
399 static void ses_process_descriptor(struct enclosure_component *ecomp,
402 int eip = desc[0] & 0x10;
403 int invalid = desc[0] & 0x80;
404 enum scsi_protocol proto = desc[0] & 0x0f;
407 struct ses_component *scomp = ecomp->scratch;
414 case SCSI_PROTOCOL_FCP:
420 case SCSI_PROTOCOL_SAS:
427 /* only take the phy0 addr */
428 addr = (u64)d[12] << 56 |
438 /* FIXME: Need to add more protocols than just SAS */
450 static int ses_enclosure_find_by_addr(struct enclosure_device *edev,
453 struct efd *efd = data;
455 struct ses_component *scomp;
457 if (!edev->component[0].scratch)
460 for (i = 0; i < edev->components; i++) {
461 scomp = edev->component[i].scratch;
462 if (scomp->addr != efd->addr)
465 if (enclosure_add_device(edev, i, efd->dev) == 0)
466 kobject_uevent(&efd->dev->kobj, KOBJ_CHANGE);
472 #define INIT_ALLOC_SIZE 32
474 static void ses_enclosure_data_process(struct enclosure_device *edev,
475 struct scsi_device *sdev,
479 unsigned char *buf = NULL, *type_ptr, *desc_ptr, *addl_desc_ptr = NULL;
480 int i, j, page7_len, len, components;
481 struct ses_device *ses_dev = edev->scratch;
482 int types = ses_dev->page1_num_types;
483 unsigned char *hdr_buf = kzalloc(INIT_ALLOC_SIZE, GFP_KERNEL);
486 goto simple_populate;
488 /* re-read page 10 */
490 ses_recv_diag(sdev, 10, ses_dev->page10, ses_dev->page10_len);
491 /* Page 7 for the descriptors is optional */
492 result = ses_recv_diag(sdev, 7, hdr_buf, INIT_ALLOC_SIZE);
494 goto simple_populate;
496 page7_len = len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
497 /* add 1 for trailing '\0' we'll use */
498 buf = kzalloc(len + 1, GFP_KERNEL);
500 goto simple_populate;
501 result = ses_recv_diag(sdev, 7, buf, len);
511 len = (desc_ptr[2] << 8) + desc_ptr[3];
512 /* skip past overall descriptor */
516 addl_desc_ptr = ses_dev->page10 + 8;
517 type_ptr = ses_dev->page1_types;
519 for (i = 0; i < types; i++, type_ptr += 4) {
520 for (j = 0; j < type_ptr[1]; j++) {
522 struct enclosure_component *ecomp;
525 if (desc_ptr >= buf + page7_len) {
528 len = (desc_ptr[2] << 8) + desc_ptr[3];
530 /* Add trailing zero - pushes into
532 desc_ptr[len] = '\0';
536 if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
537 type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE) {
540 ecomp = enclosure_component_alloc(
546 ecomp = &edev->component[components++];
548 if (!IS_ERR(ecomp)) {
550 ses_process_descriptor(
554 enclosure_component_register(
562 /* only find additional descriptions for specific devices */
563 (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
564 type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE ||
565 type_ptr[0] == ENCLOSURE_COMPONENT_SAS_EXPANDER ||
566 /* these elements are optional */
567 type_ptr[0] == ENCLOSURE_COMPONENT_SCSI_TARGET_PORT ||
568 type_ptr[0] == ENCLOSURE_COMPONENT_SCSI_INITIATOR_PORT ||
569 type_ptr[0] == ENCLOSURE_COMPONENT_CONTROLLER_ELECTRONICS))
570 addl_desc_ptr += addl_desc_ptr[1] + 2;
578 static void ses_match_to_enclosure(struct enclosure_device *edev,
579 struct scsi_device *sdev)
586 ses_enclosure_data_process(edev, to_scsi_device(edev->edev.parent), 0);
588 if (!sdev->vpd_pg83_len)
591 desc = sdev->vpd_pg83 + 4;
592 while (desc < sdev->vpd_pg83 + sdev->vpd_pg83_len) {
593 enum scsi_protocol proto = desc[0] >> 4;
594 u8 code_set = desc[0] & 0x0f;
595 u8 piv = desc[1] & 0x80;
596 u8 assoc = (desc[1] & 0x30) >> 4;
597 u8 type = desc[1] & 0x0f;
600 if (piv && code_set == 1 && assoc == 1
601 && proto == SCSI_PROTOCOL_SAS && type == 3 && len == 8)
602 efd.addr = get_unaligned_be64(&desc[4]);
607 efd.dev = &sdev->sdev_gendev;
609 enclosure_for_each_device(ses_enclosure_find_by_addr, &efd);
613 static int ses_intf_add(struct device *cdev,
614 struct class_interface *intf)
616 struct scsi_device *sdev = to_scsi_device(cdev->parent);
617 struct scsi_device *tmp_sdev;
618 unsigned char *buf = NULL, *hdr_buf, *type_ptr;
619 struct ses_device *ses_dev;
621 int i, types, len, components = 0;
624 struct enclosure_device *edev;
625 struct ses_component *scomp = NULL;
627 if (!scsi_device_enclosure(sdev)) {
628 /* not an enclosure, but might be in one */
629 struct enclosure_device *prev = NULL;
631 while ((edev = enclosure_find(&sdev->host->shost_gendev, prev)) != NULL) {
632 ses_match_to_enclosure(edev, sdev);
638 /* TYPE_ENCLOSURE prints a message in probe */
639 if (sdev->type != TYPE_ENCLOSURE)
640 sdev_printk(KERN_NOTICE, sdev, "Embedded Enclosure Device\n");
642 ses_dev = kzalloc(sizeof(*ses_dev), GFP_KERNEL);
643 hdr_buf = kzalloc(INIT_ALLOC_SIZE, GFP_KERNEL);
644 if (!hdr_buf || !ses_dev)
647 result = ses_recv_diag(sdev, 1, hdr_buf, INIT_ALLOC_SIZE);
651 len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
652 buf = kzalloc(len, GFP_KERNEL);
656 result = ses_recv_diag(sdev, 1, buf, len);
662 /* we always have one main enclosure and the rest are referred
663 * to as secondary subenclosures */
664 num_enclosures = buf[1] + 1;
666 /* begin at the enclosure descriptor */
668 /* skip all the enclosure descriptors */
669 for (i = 0; i < num_enclosures && type_ptr < buf + len; i++) {
670 types += type_ptr[2];
671 type_ptr += type_ptr[3] + 4;
674 ses_dev->page1_types = type_ptr;
675 ses_dev->page1_num_types = types;
677 for (i = 0; i < types && type_ptr < buf + len; i++, type_ptr += 4) {
678 if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||
679 type_ptr[0] == ENCLOSURE_COMPONENT_ARRAY_DEVICE)
680 components += type_ptr[1];
682 ses_dev->page1 = buf;
683 ses_dev->page1_len = len;
686 result = ses_recv_diag(sdev, 2, hdr_buf, INIT_ALLOC_SIZE);
690 len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
691 buf = kzalloc(len, GFP_KERNEL);
695 /* make sure getting page 2 actually works */
696 result = ses_recv_diag(sdev, 2, buf, len);
699 ses_dev->page2 = buf;
700 ses_dev->page2_len = len;
703 /* The additional information page --- allows us
704 * to match up the devices */
705 result = ses_recv_diag(sdev, 10, hdr_buf, INIT_ALLOC_SIZE);
708 len = (hdr_buf[2] << 8) + hdr_buf[3] + 4;
709 buf = kzalloc(len, GFP_KERNEL);
713 result = ses_recv_diag(sdev, 10, buf, len);
716 ses_dev->page10 = buf;
717 ses_dev->page10_len = len;
720 scomp = kzalloc(sizeof(struct ses_component) * components, GFP_KERNEL);
724 edev = enclosure_register(cdev->parent, dev_name(&sdev->sdev_gendev),
725 components, &ses_enclosure_callbacks);
733 edev->scratch = ses_dev;
734 for (i = 0; i < components; i++)
735 edev->component[i].scratch = scomp + i;
737 ses_enclosure_data_process(edev, sdev, 1);
739 /* see if there are any devices matching before
740 * we found the enclosure */
741 shost_for_each_device(tmp_sdev, sdev->host) {
742 if (tmp_sdev->lun != 0 || scsi_device_enclosure(tmp_sdev))
744 ses_match_to_enclosure(edev, tmp_sdev);
750 sdev_printk(KERN_ERR, sdev, "Failed to get diagnostic page 0x%x\n",
756 kfree(ses_dev->page10);
757 kfree(ses_dev->page2);
758 kfree(ses_dev->page1);
762 sdev_printk(KERN_ERR, sdev, "Failed to bind enclosure %d\n", err);
766 static int ses_remove(struct device *dev)
771 static void ses_intf_remove_component(struct scsi_device *sdev)
773 struct enclosure_device *edev, *prev = NULL;
775 while ((edev = enclosure_find(&sdev->host->shost_gendev, prev)) != NULL) {
777 if (!enclosure_remove_device(edev, &sdev->sdev_gendev))
781 put_device(&edev->edev);
784 static void ses_intf_remove_enclosure(struct scsi_device *sdev)
786 struct enclosure_device *edev;
787 struct ses_device *ses_dev;
789 /* exact match to this enclosure */
790 edev = enclosure_find(&sdev->sdev_gendev, NULL);
794 ses_dev = edev->scratch;
795 edev->scratch = NULL;
797 kfree(ses_dev->page10);
798 kfree(ses_dev->page1);
799 kfree(ses_dev->page2);
802 kfree(edev->component[0].scratch);
804 put_device(&edev->edev);
805 enclosure_unregister(edev);
808 static void ses_intf_remove(struct device *cdev,
809 struct class_interface *intf)
811 struct scsi_device *sdev = to_scsi_device(cdev->parent);
813 if (!scsi_device_enclosure(sdev))
814 ses_intf_remove_component(sdev);
816 ses_intf_remove_enclosure(sdev);
819 static struct class_interface ses_interface = {
820 .add_dev = ses_intf_add,
821 .remove_dev = ses_intf_remove,
824 static struct scsi_driver ses_template = {
827 .owner = THIS_MODULE,
829 .remove = ses_remove,
833 static int __init ses_init(void)
837 err = scsi_register_interface(&ses_interface);
841 err = scsi_register_driver(&ses_template.gendrv);
848 scsi_unregister_interface(&ses_interface);
852 static void __exit ses_exit(void)
854 scsi_unregister_driver(&ses_template.gendrv);
855 scsi_unregister_interface(&ses_interface);
858 module_init(ses_init);
859 module_exit(ses_exit);
861 MODULE_ALIAS_SCSI_DEVICE(TYPE_ENCLOSURE);
863 MODULE_AUTHOR("James Bottomley");
864 MODULE_DESCRIPTION("SCSI Enclosure Services (ses) driver");
865 MODULE_LICENSE("GPL v2");