2 * Target driver for EMC CLARiiON AX/CX-series hardware.
3 * Based on code from Lars Marowsky-Bree <lmb@suse.de>
4 * and Ed Goggin <egoggin@emc.com>.
6 * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
7 * Copyright (C) 2006 Mike Christie
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2, or (at your option)
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; see the file COPYING. If not, write to
21 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
23 #include <scsi/scsi.h>
24 #include <scsi/scsi_eh.h>
25 #include <scsi/scsi_dh.h>
26 #include <scsi/scsi_device.h>
28 #define CLARIION_NAME "emc"
30 #define CLARIION_TRESPASS_PAGE 0x22
31 #define CLARIION_BUFFER_SIZE 0xFC
32 #define CLARIION_TIMEOUT (60 * HZ)
33 #define CLARIION_RETRIES 3
34 #define CLARIION_UNBOUND_LU -1
35 #define CLARIION_SP_A 0
36 #define CLARIION_SP_B 1
39 #define CLARIION_SHORT_TRESPASS 1
40 #define CLARIION_HONOR_RESERVATIONS 2
43 #define CLARIION_LUN_UNINITIALIZED -1
44 #define CLARIION_LUN_UNBOUND 0
45 #define CLARIION_LUN_BOUND 1
46 #define CLARIION_LUN_OWNED 2
48 static unsigned char long_trespass[] = {
49 0, 0, 0, 0, 0, 0, 0, 0,
50 CLARIION_TRESPASS_PAGE, /* Page code */
51 0x09, /* Page length - 2 */
52 0x01, /* Trespass code */
53 0xff, 0xff, /* Trespass target */
54 0, 0, 0, 0, 0, 0 /* Reserved bytes / unknown */
57 static unsigned char short_trespass[] = {
59 CLARIION_TRESPASS_PAGE, /* Page code */
60 0x02, /* Page length - 2 */
61 0x01, /* Trespass code */
62 0xff, /* Trespass target */
65 static const char * lun_state[] =
72 struct clariion_dh_data {
75 * CLARIION_SHORT_TRESPASS
76 * Use short trespass command (FC-series) or the long version
77 * (default for AX/CX CLARiiON arrays).
79 * CLARIION_HONOR_RESERVATIONS
80 * Whether or not (default) to honor SCSI reservations when
81 * initiating a switch-over.
85 * I/O buffer for both MODE_SELECT and INQUIRY commands.
87 unsigned char buffer[CLARIION_BUFFER_SIZE];
89 * SCSI sense buffer for commands -- assumes serial issuance
90 * and completion sequence of all commands for same multipath.
92 unsigned char sense[SCSI_SENSE_BUFFERSIZE];
93 unsigned int senselen;
103 * which SP (A=0,B=1,UNBOUND=-1) is the default SP for this
108 * which SP (A=0,B=1,UNBOUND=-1) is the active SP for this
114 static inline struct clariion_dh_data
115 *get_clariion_data(struct scsi_device *sdev)
117 struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data;
118 BUG_ON(scsi_dh_data == NULL);
119 return ((struct clariion_dh_data *) scsi_dh_data->buf);
123 * Parse MODE_SELECT cmd reply.
125 static int trespass_endio(struct scsi_device *sdev, char *sense)
127 int err = SCSI_DH_IO;
128 struct scsi_sense_hdr sshdr;
130 if (!scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)) {
131 sdev_printk(KERN_ERR, sdev, "%s: Found valid sense data 0x%2x, "
132 "0x%2x, 0x%2x while sending CLARiiON trespass "
133 "command.\n", CLARIION_NAME, sshdr.sense_key,
134 sshdr.asc, sshdr.ascq);
136 if ((sshdr.sense_key == 0x05) && (sshdr.asc == 0x04) &&
137 (sshdr.ascq == 0x00)) {
139 * Array based copy in progress -- do not send
140 * mode_select or copy will be aborted mid-stream.
142 sdev_printk(KERN_INFO, sdev, "%s: Array Based Copy in "
143 "progress while sending CLARiiON trespass "
144 "command.\n", CLARIION_NAME);
145 err = SCSI_DH_DEV_TEMP_BUSY;
146 } else if ((sshdr.sense_key == 0x02) && (sshdr.asc == 0x04) &&
147 (sshdr.ascq == 0x03)) {
149 * LUN Not Ready - Manual Intervention Required
150 * indicates in-progress ucode upgrade (NDU).
152 sdev_printk(KERN_INFO, sdev, "%s: Detected in-progress "
153 "ucode upgrade NDU operation while sending "
154 "CLARiiON trespass command.\n", CLARIION_NAME);
155 err = SCSI_DH_DEV_TEMP_BUSY;
157 err = SCSI_DH_DEV_FAILED;
159 sdev_printk(KERN_INFO, sdev,
160 "%s: failed to send MODE SELECT, no sense available\n",
166 static int parse_sp_info_reply(struct scsi_device *sdev,
167 struct clariion_dh_data *csdev)
169 int err = SCSI_DH_OK;
171 /* check for in-progress ucode upgrade (NDU) */
172 if (csdev->buffer[48] != 0) {
173 sdev_printk(KERN_NOTICE, sdev, "%s: Detected in-progress "
174 "ucode upgrade NDU operation while finding "
175 "current active SP.", CLARIION_NAME);
176 err = SCSI_DH_DEV_TEMP_BUSY;
179 if (csdev->buffer[4] > 2) {
180 /* Invalid buffer format */
181 sdev_printk(KERN_NOTICE, sdev,
182 "%s: invalid VPD page 0xC0 format\n",
187 switch (csdev->buffer[28] & 0x0f) {
189 sdev_printk(KERN_NOTICE, sdev,
190 "%s: ALUA failover mode detected\n",
197 sdev_printk(KERN_WARNING, sdev,
198 "%s: Invalid failover mode %d\n",
199 CLARIION_NAME, csdev->buffer[28] & 0x0f);
204 csdev->default_sp = csdev->buffer[5];
205 csdev->lun_state = csdev->buffer[4];
206 csdev->current_sp = csdev->buffer[8];
207 csdev->port = csdev->buffer[7];
213 #define emc_default_str "FC (Legacy)"
215 static char * parse_sp_model(struct scsi_device *sdev, unsigned char *buffer)
217 unsigned char len = buffer[4] + 5;
218 char *sp_model = NULL;
219 unsigned char sp_len, serial_len;
222 sdev_printk(KERN_WARNING, sdev,
223 "%s: Invalid information section length %d\n",
225 /* Check for old FC arrays */
226 if (!strncmp(buffer + 8, "DGC", 3)) {
227 /* Old FC array, not supporting extended information */
228 sp_model = emc_default_str;
234 * Parse extended information for SP model number
236 serial_len = buffer[160];
237 if (serial_len == 0 || serial_len + 161 > len) {
238 sdev_printk(KERN_WARNING, sdev,
239 "%s: Invalid array serial number length %d\n",
240 CLARIION_NAME, serial_len);
244 if (sp_len == 0 || serial_len + sp_len + 161 > len) {
245 sdev_printk(KERN_WARNING, sdev,
246 "%s: Invalid model number length %d\n",
247 CLARIION_NAME, sp_len);
250 sp_model = &buffer[serial_len + 161];
251 /* Strip whitespace at the end */
252 while (sp_len > 1 && sp_model[sp_len - 1] == ' ')
255 sp_model[sp_len] = '\0';
262 * Get block request for REQ_BLOCK_PC command issued to path. Currently
263 * limited to MODE_SELECT (trespass) and INQUIRY (VPD page 0xC0) commands.
265 * Uses data and sense buffers in hardware handler context structure and
266 * assumes serial servicing of commands, both issuance and completion.
268 static struct request *get_req(struct scsi_device *sdev, int cmd,
269 unsigned char *buffer)
274 rq = blk_get_request(sdev->request_queue,
275 (cmd == MODE_SELECT) ? WRITE : READ, GFP_NOIO);
277 sdev_printk(KERN_INFO, sdev, "get_req: blk_get_request failed");
281 rq->cmd_len = COMMAND_SIZE(cmd);
286 len = sizeof(short_trespass);
287 rq->cmd_flags |= REQ_RW;
291 len = sizeof(long_trespass);
292 rq->cmd_flags |= REQ_RW;
296 len = CLARIION_BUFFER_SIZE;
297 memset(buffer, 0, len);
305 rq->cmd_type = REQ_TYPE_BLOCK_PC;
306 rq->cmd_flags |= REQ_FAILFAST;
307 rq->timeout = CLARIION_TIMEOUT;
308 rq->retries = CLARIION_RETRIES;
310 if (blk_rq_map_kern(rq->q, rq, buffer, len, GFP_NOIO)) {
318 static int send_inquiry_cmd(struct scsi_device *sdev, int page,
319 struct clariion_dh_data *csdev)
321 struct request *rq = get_req(sdev, INQUIRY, csdev->buffer);
325 return SCSI_DH_RES_TEMP_UNAVAIL;
327 rq->sense = csdev->sense;
328 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
329 rq->sense_len = csdev->senselen = 0;
331 rq->cmd[0] = INQUIRY;
336 err = blk_execute_rq(sdev->request_queue, NULL, rq, 1);
338 sdev_printk(KERN_INFO, sdev,
339 "%s: failed to send %s INQUIRY: %x\n",
340 CLARIION_NAME, page?"EVPD":"standard",
342 csdev->senselen = rq->sense_len;
351 static int send_trespass_cmd(struct scsi_device *sdev,
352 struct clariion_dh_data *csdev)
355 unsigned char *page22;
358 if (csdev->flags & CLARIION_SHORT_TRESPASS) {
359 page22 = short_trespass;
360 if (!(csdev->flags & CLARIION_HONOR_RESERVATIONS))
361 /* Set Honor Reservations bit */
363 len = sizeof(short_trespass);
366 page22 = long_trespass;
367 if (!(csdev->flags & CLARIION_HONOR_RESERVATIONS))
368 /* Set Honor Reservations bit */
370 len = sizeof(long_trespass);
371 cmd = MODE_SELECT_10;
373 BUG_ON((len > CLARIION_BUFFER_SIZE));
374 memcpy(csdev->buffer, page22, len);
376 rq = get_req(sdev, cmd, csdev->buffer);
378 return SCSI_DH_RES_TEMP_UNAVAIL;
380 rq->sense = csdev->sense;
381 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
382 rq->sense_len = csdev->senselen = 0;
384 err = blk_execute_rq(sdev->request_queue, NULL, rq, 1);
387 err = trespass_endio(sdev, csdev->sense);
389 sdev_printk(KERN_INFO, sdev,
390 "%s: failed to send MODE SELECT: %x\n",
391 CLARIION_NAME, rq->errors);
400 static int clariion_check_sense(struct scsi_device *sdev,
401 struct scsi_sense_hdr *sense_hdr)
403 switch (sense_hdr->sense_key) {
405 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x03)
407 * LUN Not Ready - Manual Intervention Required
408 * indicates this is a passive path.
410 * FIXME: However, if this is seen and EVPD C0
411 * indicates that this is due to a NDU in
412 * progress, we should set FAIL_PATH too.
413 * This indicates we might have to do a SCSI
414 * inquiry in the end_io path. Ugh.
416 * Can return FAILED only when we want the error
417 * recovery process to kick in.
421 case ILLEGAL_REQUEST:
422 if (sense_hdr->asc == 0x25 && sense_hdr->ascq == 0x01)
424 * An array based copy is in progress. Do not
425 * fail the path, do not bypass to another PG,
426 * do not retry. Fail the IO immediately.
427 * (Actually this is the same conclusion as in
428 * the default handler, but lets make sure.)
430 * Can return FAILED only when we want the error
431 * recovery process to kick in.
436 if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
438 * Unit Attention Code. This is the first IO
439 * to the new path, so just retry.
441 return ADD_TO_MLQUEUE;
445 return SCSI_RETURN_NOT_HANDLED;
448 static int clariion_prep_fn(struct scsi_device *sdev, struct request *req)
450 struct clariion_dh_data *h = get_clariion_data(sdev);
451 int ret = BLKPREP_OK;
453 if (h->lun_state != CLARIION_LUN_OWNED) {
455 req->cmd_flags |= REQ_QUIET;
461 static int clariion_std_inquiry(struct scsi_device *sdev,
462 struct clariion_dh_data *csdev)
467 err = send_inquiry_cmd(sdev, 0, csdev);
468 if (err != SCSI_DH_OK && csdev->senselen) {
469 struct scsi_sense_hdr sshdr;
471 if (scsi_normalize_sense(csdev->sense, SCSI_SENSE_BUFFERSIZE,
473 sdev_printk(KERN_ERR, sdev, "%s: INQUIRY sense code "
474 "%02x/%02x/%02x\n", CLARIION_NAME,
475 sshdr.sense_key, sshdr.asc, sshdr.ascq);
481 sp_model = parse_sp_model(sdev, csdev->buffer);
483 err = SCSI_DH_DEV_UNSUPP;
488 * FC Series arrays do not support long trespass
490 if (!strlen(sp_model) || !strncmp(sp_model, "FC",2))
491 csdev->flags |= CLARIION_SHORT_TRESPASS;
493 sdev_printk(KERN_INFO, sdev,
494 "%s: detected Clariion %s, flags %x\n",
495 CLARIION_NAME, sp_model, csdev->flags);
500 static int clariion_send_inquiry(struct scsi_device *sdev,
501 struct clariion_dh_data *csdev)
503 int err, retry = CLARIION_RETRIES;
506 err = send_inquiry_cmd(sdev, 0xC0, csdev);
507 if (err != SCSI_DH_OK && csdev->senselen) {
508 struct scsi_sense_hdr sshdr;
510 err = scsi_normalize_sense(csdev->sense, SCSI_SENSE_BUFFERSIZE,
515 err = clariion_check_sense(sdev, &sshdr);
516 if (retry > 0 && err == ADD_TO_MLQUEUE) {
520 sdev_printk(KERN_ERR, sdev, "%s: INQUIRY sense code "
521 "%02x/%02x/%02x\n", CLARIION_NAME,
522 sshdr.sense_key, sshdr.asc, sshdr.ascq);
525 err = parse_sp_info_reply(sdev, csdev);
530 static int clariion_activate(struct scsi_device *sdev)
532 struct clariion_dh_data *csdev = get_clariion_data(sdev);
535 result = clariion_send_inquiry(sdev, csdev);
536 if (result != SCSI_DH_OK)
539 if (csdev->lun_state == CLARIION_LUN_OWNED)
542 result = send_trespass_cmd(sdev, csdev);
543 if (result != SCSI_DH_OK)
545 sdev_printk(KERN_INFO, sdev,"%s: %s trespass command sent\n",
547 csdev->flags&CLARIION_SHORT_TRESPASS?"short":"long" );
550 result = clariion_send_inquiry(sdev, csdev);
551 if (result != SCSI_DH_OK)
555 sdev_printk(KERN_INFO, sdev,
556 "%s: at SP %c Port %d (%s, default SP %c)\n",
557 CLARIION_NAME, csdev->current_sp + 'A',
558 csdev->port, lun_state[csdev->lun_state],
559 csdev->default_sp + 'A');
564 static const struct scsi_dh_devlist clariion_dev_list[] = {
571 static int clariion_bus_attach(struct scsi_device *sdev);
572 static void clariion_bus_detach(struct scsi_device *sdev);
574 static struct scsi_device_handler clariion_dh = {
575 .name = CLARIION_NAME,
576 .module = THIS_MODULE,
577 .devlist = clariion_dev_list,
578 .attach = clariion_bus_attach,
579 .detach = clariion_bus_detach,
580 .check_sense = clariion_check_sense,
581 .activate = clariion_activate,
582 .prep_fn = clariion_prep_fn,
586 * TODO: need some interface so we can set trespass values
588 static int clariion_bus_attach(struct scsi_device *sdev)
590 struct scsi_dh_data *scsi_dh_data;
591 struct clariion_dh_data *h;
595 scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *)
596 + sizeof(*h) , GFP_KERNEL);
598 sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n",
603 scsi_dh_data->scsi_dh = &clariion_dh;
604 h = (struct clariion_dh_data *) scsi_dh_data->buf;
605 h->lun_state = CLARIION_LUN_UNINITIALIZED;
606 h->default_sp = CLARIION_UNBOUND_LU;
607 h->current_sp = CLARIION_UNBOUND_LU;
609 err = clariion_std_inquiry(sdev, h);
610 if (err != SCSI_DH_OK)
613 err = clariion_send_inquiry(sdev, h);
614 if (err != SCSI_DH_OK)
617 if (!try_module_get(THIS_MODULE))
620 spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
621 sdev->scsi_dh_data = scsi_dh_data;
622 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
624 sdev_printk(KERN_INFO, sdev,
625 "%s: connected to SP %c Port %d (%s, default SP %c)\n",
626 CLARIION_NAME, h->current_sp + 'A',
627 h->port, lun_state[h->lun_state],
628 h->default_sp + 'A');
634 sdev_printk(KERN_ERR, sdev, "%s: not attached\n",
639 static void clariion_bus_detach(struct scsi_device *sdev)
641 struct scsi_dh_data *scsi_dh_data;
644 spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
645 scsi_dh_data = sdev->scsi_dh_data;
646 sdev->scsi_dh_data = NULL;
647 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
649 sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n",
653 module_put(THIS_MODULE);
656 static int __init clariion_init(void)
660 r = scsi_register_device_handler(&clariion_dh);
662 printk(KERN_ERR "%s: Failed to register scsi device handler.",
667 static void __exit clariion_exit(void)
669 scsi_unregister_device_handler(&clariion_dh);
672 module_init(clariion_init);
673 module_exit(clariion_exit);
675 MODULE_DESCRIPTION("EMC CX/AX/FC-family driver");
676 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, Chandra Seetharaman <sekharan@us.ibm.com>");
677 MODULE_LICENSE("GPL");