Loading...
1/*
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>.
5 *
6 * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
7 * Copyright (C) 2006 Mike Christie
8 *
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)
12 * any later version.
13 *
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.
18 *
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.
22 */
23#include <linux/slab.h>
24#include <scsi/scsi.h>
25#include <scsi/scsi_eh.h>
26#include <scsi/scsi_dh.h>
27#include <scsi/scsi_device.h>
28
29#define CLARIION_NAME "emc"
30
31#define CLARIION_TRESPASS_PAGE 0x22
32#define CLARIION_BUFFER_SIZE 0xFC
33#define CLARIION_TIMEOUT (60 * HZ)
34#define CLARIION_RETRIES 3
35#define CLARIION_UNBOUND_LU -1
36#define CLARIION_SP_A 0
37#define CLARIION_SP_B 1
38
39/* Flags */
40#define CLARIION_SHORT_TRESPASS 1
41#define CLARIION_HONOR_RESERVATIONS 2
42
43/* LUN states */
44#define CLARIION_LUN_UNINITIALIZED -1
45#define CLARIION_LUN_UNBOUND 0
46#define CLARIION_LUN_BOUND 1
47#define CLARIION_LUN_OWNED 2
48
49static unsigned char long_trespass[] = {
50 0, 0, 0, 0, 0, 0, 0, 0,
51 CLARIION_TRESPASS_PAGE, /* Page code */
52 0x09, /* Page length - 2 */
53 0x01, /* Trespass code */
54 0xff, 0xff, /* Trespass target */
55 0, 0, 0, 0, 0, 0 /* Reserved bytes / unknown */
56};
57
58static unsigned char short_trespass[] = {
59 0, 0, 0, 0,
60 CLARIION_TRESPASS_PAGE, /* Page code */
61 0x02, /* Page length - 2 */
62 0x01, /* Trespass code */
63 0xff, /* Trespass target */
64};
65
66static const char * lun_state[] =
67{
68 "not bound",
69 "bound",
70 "owned",
71};
72
73struct clariion_dh_data {
74 /*
75 * Flags:
76 * CLARIION_SHORT_TRESPASS
77 * Use short trespass command (FC-series) or the long version
78 * (default for AX/CX CLARiiON arrays).
79 *
80 * CLARIION_HONOR_RESERVATIONS
81 * Whether or not (default) to honor SCSI reservations when
82 * initiating a switch-over.
83 */
84 unsigned flags;
85 /*
86 * I/O buffer for both MODE_SELECT and INQUIRY commands.
87 */
88 unsigned char buffer[CLARIION_BUFFER_SIZE];
89 /*
90 * SCSI sense buffer for commands -- assumes serial issuance
91 * and completion sequence of all commands for same multipath.
92 */
93 unsigned char sense[SCSI_SENSE_BUFFERSIZE];
94 unsigned int senselen;
95 /*
96 * LUN state
97 */
98 int lun_state;
99 /*
100 * SP Port number
101 */
102 int port;
103 /*
104 * which SP (A=0,B=1,UNBOUND=-1) is the default SP for this
105 * path's mapped LUN
106 */
107 int default_sp;
108 /*
109 * which SP (A=0,B=1,UNBOUND=-1) is the active SP for this
110 * path's mapped LUN
111 */
112 int current_sp;
113};
114
115static inline struct clariion_dh_data
116 *get_clariion_data(struct scsi_device *sdev)
117{
118 struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data;
119 BUG_ON(scsi_dh_data == NULL);
120 return ((struct clariion_dh_data *) scsi_dh_data->buf);
121}
122
123/*
124 * Parse MODE_SELECT cmd reply.
125 */
126static int trespass_endio(struct scsi_device *sdev, char *sense)
127{
128 int err = SCSI_DH_IO;
129 struct scsi_sense_hdr sshdr;
130
131 if (!scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)) {
132 sdev_printk(KERN_ERR, sdev, "%s: Found valid sense data 0x%2x, "
133 "0x%2x, 0x%2x while sending CLARiiON trespass "
134 "command.\n", CLARIION_NAME, sshdr.sense_key,
135 sshdr.asc, sshdr.ascq);
136
137 if ((sshdr.sense_key == 0x05) && (sshdr.asc == 0x04) &&
138 (sshdr.ascq == 0x00)) {
139 /*
140 * Array based copy in progress -- do not send
141 * mode_select or copy will be aborted mid-stream.
142 */
143 sdev_printk(KERN_INFO, sdev, "%s: Array Based Copy in "
144 "progress while sending CLARiiON trespass "
145 "command.\n", CLARIION_NAME);
146 err = SCSI_DH_DEV_TEMP_BUSY;
147 } else if ((sshdr.sense_key == 0x02) && (sshdr.asc == 0x04) &&
148 (sshdr.ascq == 0x03)) {
149 /*
150 * LUN Not Ready - Manual Intervention Required
151 * indicates in-progress ucode upgrade (NDU).
152 */
153 sdev_printk(KERN_INFO, sdev, "%s: Detected in-progress "
154 "ucode upgrade NDU operation while sending "
155 "CLARiiON trespass command.\n", CLARIION_NAME);
156 err = SCSI_DH_DEV_TEMP_BUSY;
157 } else
158 err = SCSI_DH_DEV_FAILED;
159 } else {
160 sdev_printk(KERN_INFO, sdev,
161 "%s: failed to send MODE SELECT, no sense available\n",
162 CLARIION_NAME);
163 }
164 return err;
165}
166
167static int parse_sp_info_reply(struct scsi_device *sdev,
168 struct clariion_dh_data *csdev)
169{
170 int err = SCSI_DH_OK;
171
172 /* check for in-progress ucode upgrade (NDU) */
173 if (csdev->buffer[48] != 0) {
174 sdev_printk(KERN_NOTICE, sdev, "%s: Detected in-progress "
175 "ucode upgrade NDU operation while finding "
176 "current active SP.", CLARIION_NAME);
177 err = SCSI_DH_DEV_TEMP_BUSY;
178 goto out;
179 }
180 if (csdev->buffer[4] > 2) {
181 /* Invalid buffer format */
182 sdev_printk(KERN_NOTICE, sdev,
183 "%s: invalid VPD page 0xC0 format\n",
184 CLARIION_NAME);
185 err = SCSI_DH_NOSYS;
186 goto out;
187 }
188 switch (csdev->buffer[28] & 0x0f) {
189 case 6:
190 sdev_printk(KERN_NOTICE, sdev,
191 "%s: ALUA failover mode detected\n",
192 CLARIION_NAME);
193 break;
194 case 4:
195 /* Linux failover */
196 break;
197 default:
198 sdev_printk(KERN_WARNING, sdev,
199 "%s: Invalid failover mode %d\n",
200 CLARIION_NAME, csdev->buffer[28] & 0x0f);
201 err = SCSI_DH_NOSYS;
202 goto out;
203 }
204
205 csdev->default_sp = csdev->buffer[5];
206 csdev->lun_state = csdev->buffer[4];
207 csdev->current_sp = csdev->buffer[8];
208 csdev->port = csdev->buffer[7];
209
210out:
211 return err;
212}
213
214#define emc_default_str "FC (Legacy)"
215
216static char * parse_sp_model(struct scsi_device *sdev, unsigned char *buffer)
217{
218 unsigned char len = buffer[4] + 5;
219 char *sp_model = NULL;
220 unsigned char sp_len, serial_len;
221
222 if (len < 160) {
223 sdev_printk(KERN_WARNING, sdev,
224 "%s: Invalid information section length %d\n",
225 CLARIION_NAME, len);
226 /* Check for old FC arrays */
227 if (!strncmp(buffer + 8, "DGC", 3)) {
228 /* Old FC array, not supporting extended information */
229 sp_model = emc_default_str;
230 }
231 goto out;
232 }
233
234 /*
235 * Parse extended information for SP model number
236 */
237 serial_len = buffer[160];
238 if (serial_len == 0 || serial_len + 161 > len) {
239 sdev_printk(KERN_WARNING, sdev,
240 "%s: Invalid array serial number length %d\n",
241 CLARIION_NAME, serial_len);
242 goto out;
243 }
244 sp_len = buffer[99];
245 if (sp_len == 0 || serial_len + sp_len + 161 > len) {
246 sdev_printk(KERN_WARNING, sdev,
247 "%s: Invalid model number length %d\n",
248 CLARIION_NAME, sp_len);
249 goto out;
250 }
251 sp_model = &buffer[serial_len + 161];
252 /* Strip whitespace at the end */
253 while (sp_len > 1 && sp_model[sp_len - 1] == ' ')
254 sp_len--;
255
256 sp_model[sp_len] = '\0';
257
258out:
259 return sp_model;
260}
261
262/*
263 * Get block request for REQ_BLOCK_PC command issued to path. Currently
264 * limited to MODE_SELECT (trespass) and INQUIRY (VPD page 0xC0) commands.
265 *
266 * Uses data and sense buffers in hardware handler context structure and
267 * assumes serial servicing of commands, both issuance and completion.
268 */
269static struct request *get_req(struct scsi_device *sdev, int cmd,
270 unsigned char *buffer)
271{
272 struct request *rq;
273 int len = 0;
274
275 rq = blk_get_request(sdev->request_queue,
276 (cmd != INQUIRY) ? WRITE : READ, GFP_NOIO);
277 if (!rq) {
278 sdev_printk(KERN_INFO, sdev, "get_req: blk_get_request failed");
279 return NULL;
280 }
281
282 rq->cmd_len = COMMAND_SIZE(cmd);
283 rq->cmd[0] = cmd;
284
285 switch (cmd) {
286 case MODE_SELECT:
287 len = sizeof(short_trespass);
288 rq->cmd[1] = 0x10;
289 rq->cmd[4] = len;
290 break;
291 case MODE_SELECT_10:
292 len = sizeof(long_trespass);
293 rq->cmd[1] = 0x10;
294 rq->cmd[8] = len;
295 break;
296 case INQUIRY:
297 len = CLARIION_BUFFER_SIZE;
298 rq->cmd[4] = len;
299 memset(buffer, 0, len);
300 break;
301 default:
302 BUG_ON(1);
303 break;
304 }
305
306 rq->cmd_type = REQ_TYPE_BLOCK_PC;
307 rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
308 REQ_FAILFAST_DRIVER;
309 rq->timeout = CLARIION_TIMEOUT;
310 rq->retries = CLARIION_RETRIES;
311
312 if (blk_rq_map_kern(rq->q, rq, buffer, len, GFP_NOIO)) {
313 blk_put_request(rq);
314 return NULL;
315 }
316
317 return rq;
318}
319
320static int send_inquiry_cmd(struct scsi_device *sdev, int page,
321 struct clariion_dh_data *csdev)
322{
323 struct request *rq = get_req(sdev, INQUIRY, csdev->buffer);
324 int err;
325
326 if (!rq)
327 return SCSI_DH_RES_TEMP_UNAVAIL;
328
329 rq->sense = csdev->sense;
330 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
331 rq->sense_len = csdev->senselen = 0;
332
333 rq->cmd[0] = INQUIRY;
334 if (page != 0) {
335 rq->cmd[1] = 1;
336 rq->cmd[2] = page;
337 }
338 err = blk_execute_rq(sdev->request_queue, NULL, rq, 1);
339 if (err == -EIO) {
340 sdev_printk(KERN_INFO, sdev,
341 "%s: failed to send %s INQUIRY: %x\n",
342 CLARIION_NAME, page?"EVPD":"standard",
343 rq->errors);
344 csdev->senselen = rq->sense_len;
345 err = SCSI_DH_IO;
346 }
347
348 blk_put_request(rq);
349
350 return err;
351}
352
353static int send_trespass_cmd(struct scsi_device *sdev,
354 struct clariion_dh_data *csdev)
355{
356 struct request *rq;
357 unsigned char *page22;
358 int err, len, cmd;
359
360 if (csdev->flags & CLARIION_SHORT_TRESPASS) {
361 page22 = short_trespass;
362 if (!(csdev->flags & CLARIION_HONOR_RESERVATIONS))
363 /* Set Honor Reservations bit */
364 page22[6] |= 0x80;
365 len = sizeof(short_trespass);
366 cmd = MODE_SELECT;
367 } else {
368 page22 = long_trespass;
369 if (!(csdev->flags & CLARIION_HONOR_RESERVATIONS))
370 /* Set Honor Reservations bit */
371 page22[10] |= 0x80;
372 len = sizeof(long_trespass);
373 cmd = MODE_SELECT_10;
374 }
375 BUG_ON((len > CLARIION_BUFFER_SIZE));
376 memcpy(csdev->buffer, page22, len);
377
378 rq = get_req(sdev, cmd, csdev->buffer);
379 if (!rq)
380 return SCSI_DH_RES_TEMP_UNAVAIL;
381
382 rq->sense = csdev->sense;
383 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
384 rq->sense_len = csdev->senselen = 0;
385
386 err = blk_execute_rq(sdev->request_queue, NULL, rq, 1);
387 if (err == -EIO) {
388 if (rq->sense_len) {
389 err = trespass_endio(sdev, csdev->sense);
390 } else {
391 sdev_printk(KERN_INFO, sdev,
392 "%s: failed to send MODE SELECT: %x\n",
393 CLARIION_NAME, rq->errors);
394 }
395 }
396
397 blk_put_request(rq);
398
399 return err;
400}
401
402static int clariion_check_sense(struct scsi_device *sdev,
403 struct scsi_sense_hdr *sense_hdr)
404{
405 switch (sense_hdr->sense_key) {
406 case NOT_READY:
407 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x03)
408 /*
409 * LUN Not Ready - Manual Intervention Required
410 * indicates this is a passive path.
411 *
412 * FIXME: However, if this is seen and EVPD C0
413 * indicates that this is due to a NDU in
414 * progress, we should set FAIL_PATH too.
415 * This indicates we might have to do a SCSI
416 * inquiry in the end_io path. Ugh.
417 *
418 * Can return FAILED only when we want the error
419 * recovery process to kick in.
420 */
421 return SUCCESS;
422 break;
423 case ILLEGAL_REQUEST:
424 if (sense_hdr->asc == 0x25 && sense_hdr->ascq == 0x01)
425 /*
426 * An array based copy is in progress. Do not
427 * fail the path, do not bypass to another PG,
428 * do not retry. Fail the IO immediately.
429 * (Actually this is the same conclusion as in
430 * the default handler, but lets make sure.)
431 *
432 * Can return FAILED only when we want the error
433 * recovery process to kick in.
434 */
435 return SUCCESS;
436 break;
437 case UNIT_ATTENTION:
438 if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
439 /*
440 * Unit Attention Code. This is the first IO
441 * to the new path, so just retry.
442 */
443 return ADD_TO_MLQUEUE;
444 break;
445 }
446
447 return SCSI_RETURN_NOT_HANDLED;
448}
449
450static int clariion_prep_fn(struct scsi_device *sdev, struct request *req)
451{
452 struct clariion_dh_data *h = get_clariion_data(sdev);
453 int ret = BLKPREP_OK;
454
455 if (h->lun_state != CLARIION_LUN_OWNED) {
456 ret = BLKPREP_KILL;
457 req->cmd_flags |= REQ_QUIET;
458 }
459 return ret;
460
461}
462
463static int clariion_std_inquiry(struct scsi_device *sdev,
464 struct clariion_dh_data *csdev)
465{
466 int err;
467 char *sp_model;
468
469 err = send_inquiry_cmd(sdev, 0, csdev);
470 if (err != SCSI_DH_OK && csdev->senselen) {
471 struct scsi_sense_hdr sshdr;
472
473 if (scsi_normalize_sense(csdev->sense, SCSI_SENSE_BUFFERSIZE,
474 &sshdr)) {
475 sdev_printk(KERN_ERR, sdev, "%s: INQUIRY sense code "
476 "%02x/%02x/%02x\n", CLARIION_NAME,
477 sshdr.sense_key, sshdr.asc, sshdr.ascq);
478 }
479 err = SCSI_DH_IO;
480 goto out;
481 }
482
483 sp_model = parse_sp_model(sdev, csdev->buffer);
484 if (!sp_model) {
485 err = SCSI_DH_DEV_UNSUPP;
486 goto out;
487 }
488
489 /*
490 * FC Series arrays do not support long trespass
491 */
492 if (!strlen(sp_model) || !strncmp(sp_model, "FC",2))
493 csdev->flags |= CLARIION_SHORT_TRESPASS;
494
495 sdev_printk(KERN_INFO, sdev,
496 "%s: detected Clariion %s, flags %x\n",
497 CLARIION_NAME, sp_model, csdev->flags);
498out:
499 return err;
500}
501
502static int clariion_send_inquiry(struct scsi_device *sdev,
503 struct clariion_dh_data *csdev)
504{
505 int err, retry = CLARIION_RETRIES;
506
507retry:
508 err = send_inquiry_cmd(sdev, 0xC0, csdev);
509 if (err != SCSI_DH_OK && csdev->senselen) {
510 struct scsi_sense_hdr sshdr;
511
512 err = scsi_normalize_sense(csdev->sense, SCSI_SENSE_BUFFERSIZE,
513 &sshdr);
514 if (!err)
515 return SCSI_DH_IO;
516
517 err = clariion_check_sense(sdev, &sshdr);
518 if (retry > 0 && err == ADD_TO_MLQUEUE) {
519 retry--;
520 goto retry;
521 }
522 sdev_printk(KERN_ERR, sdev, "%s: INQUIRY sense code "
523 "%02x/%02x/%02x\n", CLARIION_NAME,
524 sshdr.sense_key, sshdr.asc, sshdr.ascq);
525 err = SCSI_DH_IO;
526 } else {
527 err = parse_sp_info_reply(sdev, csdev);
528 }
529 return err;
530}
531
532static int clariion_activate(struct scsi_device *sdev,
533 activate_complete fn, void *data)
534{
535 struct clariion_dh_data *csdev = get_clariion_data(sdev);
536 int result;
537
538 result = clariion_send_inquiry(sdev, csdev);
539 if (result != SCSI_DH_OK)
540 goto done;
541
542 if (csdev->lun_state == CLARIION_LUN_OWNED)
543 goto done;
544
545 result = send_trespass_cmd(sdev, csdev);
546 if (result != SCSI_DH_OK)
547 goto done;
548 sdev_printk(KERN_INFO, sdev,"%s: %s trespass command sent\n",
549 CLARIION_NAME,
550 csdev->flags&CLARIION_SHORT_TRESPASS?"short":"long" );
551
552 /* Update status */
553 result = clariion_send_inquiry(sdev, csdev);
554 if (result != SCSI_DH_OK)
555 goto done;
556
557done:
558 sdev_printk(KERN_INFO, sdev,
559 "%s: at SP %c Port %d (%s, default SP %c)\n",
560 CLARIION_NAME, csdev->current_sp + 'A',
561 csdev->port, lun_state[csdev->lun_state],
562 csdev->default_sp + 'A');
563
564 if (fn)
565 fn(data, result);
566 return 0;
567}
568/*
569 * params - parameters in the following format
570 * "no_of_params\0param1\0param2\0param3\0...\0"
571 * for example, string for 2 parameters with value 10 and 21
572 * is specified as "2\010\021\0".
573 */
574static int clariion_set_params(struct scsi_device *sdev, const char *params)
575{
576 struct clariion_dh_data *csdev = get_clariion_data(sdev);
577 unsigned int hr = 0, st = 0, argc;
578 const char *p = params;
579 int result = SCSI_DH_OK;
580
581 if ((sscanf(params, "%u", &argc) != 1) || (argc != 2))
582 return -EINVAL;
583
584 while (*p++)
585 ;
586 if ((sscanf(p, "%u", &st) != 1) || (st > 1))
587 return -EINVAL;
588
589 while (*p++)
590 ;
591 if ((sscanf(p, "%u", &hr) != 1) || (hr > 1))
592 return -EINVAL;
593
594 if (st)
595 csdev->flags |= CLARIION_SHORT_TRESPASS;
596 else
597 csdev->flags &= ~CLARIION_SHORT_TRESPASS;
598
599 if (hr)
600 csdev->flags |= CLARIION_HONOR_RESERVATIONS;
601 else
602 csdev->flags &= ~CLARIION_HONOR_RESERVATIONS;
603
604 /*
605 * If this path is owned, we have to send a trespass command
606 * with the new parameters. If not, simply return. Next trespass
607 * command would use the parameters.
608 */
609 if (csdev->lun_state != CLARIION_LUN_OWNED)
610 goto done;
611
612 csdev->lun_state = CLARIION_LUN_UNINITIALIZED;
613 result = send_trespass_cmd(sdev, csdev);
614 if (result != SCSI_DH_OK)
615 goto done;
616
617 /* Update status */
618 result = clariion_send_inquiry(sdev, csdev);
619
620done:
621 return result;
622}
623
624static const struct scsi_dh_devlist clariion_dev_list[] = {
625 {"DGC", "RAID"},
626 {"DGC", "DISK"},
627 {"DGC", "VRAID"},
628 {NULL, NULL},
629};
630
631static int clariion_bus_attach(struct scsi_device *sdev);
632static void clariion_bus_detach(struct scsi_device *sdev);
633
634static struct scsi_device_handler clariion_dh = {
635 .name = CLARIION_NAME,
636 .module = THIS_MODULE,
637 .devlist = clariion_dev_list,
638 .attach = clariion_bus_attach,
639 .detach = clariion_bus_detach,
640 .check_sense = clariion_check_sense,
641 .activate = clariion_activate,
642 .prep_fn = clariion_prep_fn,
643 .set_params = clariion_set_params,
644};
645
646static int clariion_bus_attach(struct scsi_device *sdev)
647{
648 struct scsi_dh_data *scsi_dh_data;
649 struct clariion_dh_data *h;
650 unsigned long flags;
651 int err;
652
653 scsi_dh_data = kzalloc(sizeof(*scsi_dh_data)
654 + sizeof(*h) , GFP_KERNEL);
655 if (!scsi_dh_data) {
656 sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n",
657 CLARIION_NAME);
658 return -ENOMEM;
659 }
660
661 scsi_dh_data->scsi_dh = &clariion_dh;
662 h = (struct clariion_dh_data *) scsi_dh_data->buf;
663 h->lun_state = CLARIION_LUN_UNINITIALIZED;
664 h->default_sp = CLARIION_UNBOUND_LU;
665 h->current_sp = CLARIION_UNBOUND_LU;
666
667 err = clariion_std_inquiry(sdev, h);
668 if (err != SCSI_DH_OK)
669 goto failed;
670
671 err = clariion_send_inquiry(sdev, h);
672 if (err != SCSI_DH_OK)
673 goto failed;
674
675 if (!try_module_get(THIS_MODULE))
676 goto failed;
677
678 spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
679 sdev->scsi_dh_data = scsi_dh_data;
680 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
681
682 sdev_printk(KERN_INFO, sdev,
683 "%s: connected to SP %c Port %d (%s, default SP %c)\n",
684 CLARIION_NAME, h->current_sp + 'A',
685 h->port, lun_state[h->lun_state],
686 h->default_sp + 'A');
687
688 return 0;
689
690failed:
691 kfree(scsi_dh_data);
692 sdev_printk(KERN_ERR, sdev, "%s: not attached\n",
693 CLARIION_NAME);
694 return -EINVAL;
695}
696
697static void clariion_bus_detach(struct scsi_device *sdev)
698{
699 struct scsi_dh_data *scsi_dh_data;
700 unsigned long flags;
701
702 spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
703 scsi_dh_data = sdev->scsi_dh_data;
704 sdev->scsi_dh_data = NULL;
705 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
706
707 sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n",
708 CLARIION_NAME);
709
710 kfree(scsi_dh_data);
711 module_put(THIS_MODULE);
712}
713
714static int __init clariion_init(void)
715{
716 int r;
717
718 r = scsi_register_device_handler(&clariion_dh);
719 if (r != 0)
720 printk(KERN_ERR "%s: Failed to register scsi device handler.",
721 CLARIION_NAME);
722 return r;
723}
724
725static void __exit clariion_exit(void)
726{
727 scsi_unregister_device_handler(&clariion_dh);
728}
729
730module_init(clariion_init);
731module_exit(clariion_exit);
732
733MODULE_DESCRIPTION("EMC CX/AX/FC-family driver");
734MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, Chandra Seetharaman <sekharan@us.ibm.com>");
735MODULE_LICENSE("GPL");
1/*
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>.
5 *
6 * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
7 * Copyright (C) 2006 Mike Christie
8 *
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)
12 * any later version.
13 *
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.
18 *
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.
22 */
23#include <linux/slab.h>
24#include <linux/module.h>
25#include <scsi/scsi.h>
26#include <scsi/scsi_eh.h>
27#include <scsi/scsi_dh.h>
28#include <scsi/scsi_device.h>
29
30#define CLARIION_NAME "emc"
31
32#define CLARIION_TRESPASS_PAGE 0x22
33#define CLARIION_BUFFER_SIZE 0xFC
34#define CLARIION_TIMEOUT (60 * HZ)
35#define CLARIION_RETRIES 3
36#define CLARIION_UNBOUND_LU -1
37#define CLARIION_SP_A 0
38#define CLARIION_SP_B 1
39
40/* Flags */
41#define CLARIION_SHORT_TRESPASS 1
42#define CLARIION_HONOR_RESERVATIONS 2
43
44/* LUN states */
45#define CLARIION_LUN_UNINITIALIZED -1
46#define CLARIION_LUN_UNBOUND 0
47#define CLARIION_LUN_BOUND 1
48#define CLARIION_LUN_OWNED 2
49
50static unsigned char long_trespass[] = {
51 0, 0, 0, 0, 0, 0, 0, 0,
52 CLARIION_TRESPASS_PAGE, /* Page code */
53 0x09, /* Page length - 2 */
54 0x01, /* Trespass code */
55 0xff, 0xff, /* Trespass target */
56 0, 0, 0, 0, 0, 0 /* Reserved bytes / unknown */
57};
58
59static unsigned char short_trespass[] = {
60 0, 0, 0, 0,
61 CLARIION_TRESPASS_PAGE, /* Page code */
62 0x02, /* Page length - 2 */
63 0x01, /* Trespass code */
64 0xff, /* Trespass target */
65};
66
67static const char * lun_state[] =
68{
69 "not bound",
70 "bound",
71 "owned",
72};
73
74struct clariion_dh_data {
75 /*
76 * Flags:
77 * CLARIION_SHORT_TRESPASS
78 * Use short trespass command (FC-series) or the long version
79 * (default for AX/CX CLARiiON arrays).
80 *
81 * CLARIION_HONOR_RESERVATIONS
82 * Whether or not (default) to honor SCSI reservations when
83 * initiating a switch-over.
84 */
85 unsigned flags;
86 /*
87 * I/O buffer for both MODE_SELECT and INQUIRY commands.
88 */
89 unsigned char buffer[CLARIION_BUFFER_SIZE];
90 /*
91 * SCSI sense buffer for commands -- assumes serial issuance
92 * and completion sequence of all commands for same multipath.
93 */
94 unsigned char sense[SCSI_SENSE_BUFFERSIZE];
95 unsigned int senselen;
96 /*
97 * LUN state
98 */
99 int lun_state;
100 /*
101 * SP Port number
102 */
103 int port;
104 /*
105 * which SP (A=0,B=1,UNBOUND=-1) is the default SP for this
106 * path's mapped LUN
107 */
108 int default_sp;
109 /*
110 * which SP (A=0,B=1,UNBOUND=-1) is the active SP for this
111 * path's mapped LUN
112 */
113 int current_sp;
114};
115
116/*
117 * Parse MODE_SELECT cmd reply.
118 */
119static int trespass_endio(struct scsi_device *sdev, char *sense)
120{
121 int err = SCSI_DH_IO;
122 struct scsi_sense_hdr sshdr;
123
124 if (!scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)) {
125 sdev_printk(KERN_ERR, sdev, "%s: Found valid sense data 0x%2x, "
126 "0x%2x, 0x%2x while sending CLARiiON trespass "
127 "command.\n", CLARIION_NAME, sshdr.sense_key,
128 sshdr.asc, sshdr.ascq);
129
130 if ((sshdr.sense_key == 0x05) && (sshdr.asc == 0x04) &&
131 (sshdr.ascq == 0x00)) {
132 /*
133 * Array based copy in progress -- do not send
134 * mode_select or copy will be aborted mid-stream.
135 */
136 sdev_printk(KERN_INFO, sdev, "%s: Array Based Copy in "
137 "progress while sending CLARiiON trespass "
138 "command.\n", CLARIION_NAME);
139 err = SCSI_DH_DEV_TEMP_BUSY;
140 } else if ((sshdr.sense_key == 0x02) && (sshdr.asc == 0x04) &&
141 (sshdr.ascq == 0x03)) {
142 /*
143 * LUN Not Ready - Manual Intervention Required
144 * indicates in-progress ucode upgrade (NDU).
145 */
146 sdev_printk(KERN_INFO, sdev, "%s: Detected in-progress "
147 "ucode upgrade NDU operation while sending "
148 "CLARiiON trespass command.\n", CLARIION_NAME);
149 err = SCSI_DH_DEV_TEMP_BUSY;
150 } else
151 err = SCSI_DH_DEV_FAILED;
152 } else {
153 sdev_printk(KERN_INFO, sdev,
154 "%s: failed to send MODE SELECT, no sense available\n",
155 CLARIION_NAME);
156 }
157 return err;
158}
159
160static int parse_sp_info_reply(struct scsi_device *sdev,
161 struct clariion_dh_data *csdev)
162{
163 int err = SCSI_DH_OK;
164
165 /* check for in-progress ucode upgrade (NDU) */
166 if (csdev->buffer[48] != 0) {
167 sdev_printk(KERN_NOTICE, sdev, "%s: Detected in-progress "
168 "ucode upgrade NDU operation while finding "
169 "current active SP.", CLARIION_NAME);
170 err = SCSI_DH_DEV_TEMP_BUSY;
171 goto out;
172 }
173 if (csdev->buffer[4] > 2) {
174 /* Invalid buffer format */
175 sdev_printk(KERN_NOTICE, sdev,
176 "%s: invalid VPD page 0xC0 format\n",
177 CLARIION_NAME);
178 err = SCSI_DH_NOSYS;
179 goto out;
180 }
181 switch (csdev->buffer[28] & 0x0f) {
182 case 6:
183 sdev_printk(KERN_NOTICE, sdev,
184 "%s: ALUA failover mode detected\n",
185 CLARIION_NAME);
186 break;
187 case 4:
188 /* Linux failover */
189 break;
190 default:
191 sdev_printk(KERN_WARNING, sdev,
192 "%s: Invalid failover mode %d\n",
193 CLARIION_NAME, csdev->buffer[28] & 0x0f);
194 err = SCSI_DH_NOSYS;
195 goto out;
196 }
197
198 csdev->default_sp = csdev->buffer[5];
199 csdev->lun_state = csdev->buffer[4];
200 csdev->current_sp = csdev->buffer[8];
201 csdev->port = csdev->buffer[7];
202 if (csdev->lun_state == CLARIION_LUN_OWNED)
203 sdev->access_state = SCSI_ACCESS_STATE_OPTIMAL;
204 else
205 sdev->access_state = SCSI_ACCESS_STATE_STANDBY;
206 if (csdev->default_sp == csdev->current_sp)
207 sdev->access_state |= SCSI_ACCESS_STATE_PREFERRED;
208out:
209 return err;
210}
211
212#define emc_default_str "FC (Legacy)"
213
214static char * parse_sp_model(struct scsi_device *sdev, unsigned char *buffer)
215{
216 unsigned char len = buffer[4] + 5;
217 char *sp_model = NULL;
218 unsigned char sp_len, serial_len;
219
220 if (len < 160) {
221 sdev_printk(KERN_WARNING, sdev,
222 "%s: Invalid information section length %d\n",
223 CLARIION_NAME, len);
224 /* Check for old FC arrays */
225 if (!strncmp(buffer + 8, "DGC", 3)) {
226 /* Old FC array, not supporting extended information */
227 sp_model = emc_default_str;
228 }
229 goto out;
230 }
231
232 /*
233 * Parse extended information for SP model number
234 */
235 serial_len = buffer[160];
236 if (serial_len == 0 || serial_len + 161 > len) {
237 sdev_printk(KERN_WARNING, sdev,
238 "%s: Invalid array serial number length %d\n",
239 CLARIION_NAME, serial_len);
240 goto out;
241 }
242 sp_len = buffer[99];
243 if (sp_len == 0 || serial_len + sp_len + 161 > len) {
244 sdev_printk(KERN_WARNING, sdev,
245 "%s: Invalid model number length %d\n",
246 CLARIION_NAME, sp_len);
247 goto out;
248 }
249 sp_model = &buffer[serial_len + 161];
250 /* Strip whitespace at the end */
251 while (sp_len > 1 && sp_model[sp_len - 1] == ' ')
252 sp_len--;
253
254 sp_model[sp_len] = '\0';
255
256out:
257 return sp_model;
258}
259
260/*
261 * Get block request for REQ_BLOCK_PC command issued to path. Currently
262 * limited to MODE_SELECT (trespass) and INQUIRY (VPD page 0xC0) commands.
263 *
264 * Uses data and sense buffers in hardware handler context structure and
265 * assumes serial servicing of commands, both issuance and completion.
266 */
267static struct request *get_req(struct scsi_device *sdev, int cmd,
268 unsigned char *buffer)
269{
270 struct request *rq;
271 int len = 0;
272
273 rq = blk_get_request(sdev->request_queue,
274 (cmd != INQUIRY) ? WRITE : READ, GFP_NOIO);
275 if (IS_ERR(rq)) {
276 sdev_printk(KERN_INFO, sdev, "get_req: blk_get_request failed");
277 return NULL;
278 }
279
280 blk_rq_set_block_pc(rq);
281 rq->cmd_len = COMMAND_SIZE(cmd);
282 rq->cmd[0] = cmd;
283
284 switch (cmd) {
285 case MODE_SELECT:
286 len = sizeof(short_trespass);
287 rq->cmd[1] = 0x10;
288 rq->cmd[4] = len;
289 break;
290 case MODE_SELECT_10:
291 len = sizeof(long_trespass);
292 rq->cmd[1] = 0x10;
293 rq->cmd[8] = len;
294 break;
295 case INQUIRY:
296 len = CLARIION_BUFFER_SIZE;
297 rq->cmd[4] = len;
298 memset(buffer, 0, len);
299 break;
300 default:
301 BUG_ON(1);
302 break;
303 }
304
305 rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
306 REQ_FAILFAST_DRIVER;
307 rq->timeout = CLARIION_TIMEOUT;
308 rq->retries = CLARIION_RETRIES;
309
310 if (blk_rq_map_kern(rq->q, rq, buffer, len, GFP_NOIO)) {
311 blk_put_request(rq);
312 return NULL;
313 }
314
315 return rq;
316}
317
318static int send_inquiry_cmd(struct scsi_device *sdev, int page,
319 struct clariion_dh_data *csdev)
320{
321 struct request *rq = get_req(sdev, INQUIRY, csdev->buffer);
322 int err;
323
324 if (!rq)
325 return SCSI_DH_RES_TEMP_UNAVAIL;
326
327 rq->sense = csdev->sense;
328 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
329 rq->sense_len = csdev->senselen = 0;
330
331 rq->cmd[0] = INQUIRY;
332 if (page != 0) {
333 rq->cmd[1] = 1;
334 rq->cmd[2] = page;
335 }
336 err = blk_execute_rq(sdev->request_queue, NULL, rq, 1);
337 if (err == -EIO) {
338 sdev_printk(KERN_INFO, sdev,
339 "%s: failed to send %s INQUIRY: %x\n",
340 CLARIION_NAME, page?"EVPD":"standard",
341 rq->errors);
342 csdev->senselen = rq->sense_len;
343 err = SCSI_DH_IO;
344 }
345
346 blk_put_request(rq);
347
348 return err;
349}
350
351static int send_trespass_cmd(struct scsi_device *sdev,
352 struct clariion_dh_data *csdev)
353{
354 struct request *rq;
355 unsigned char *page22;
356 int err, len, cmd;
357
358 if (csdev->flags & CLARIION_SHORT_TRESPASS) {
359 page22 = short_trespass;
360 if (!(csdev->flags & CLARIION_HONOR_RESERVATIONS))
361 /* Set Honor Reservations bit */
362 page22[6] |= 0x80;
363 len = sizeof(short_trespass);
364 cmd = MODE_SELECT;
365 } else {
366 page22 = long_trespass;
367 if (!(csdev->flags & CLARIION_HONOR_RESERVATIONS))
368 /* Set Honor Reservations bit */
369 page22[10] |= 0x80;
370 len = sizeof(long_trespass);
371 cmd = MODE_SELECT_10;
372 }
373 BUG_ON((len > CLARIION_BUFFER_SIZE));
374 memcpy(csdev->buffer, page22, len);
375
376 rq = get_req(sdev, cmd, csdev->buffer);
377 if (!rq)
378 return SCSI_DH_RES_TEMP_UNAVAIL;
379
380 rq->sense = csdev->sense;
381 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
382 rq->sense_len = csdev->senselen = 0;
383
384 err = blk_execute_rq(sdev->request_queue, NULL, rq, 1);
385 if (err == -EIO) {
386 if (rq->sense_len) {
387 err = trespass_endio(sdev, csdev->sense);
388 } else {
389 sdev_printk(KERN_INFO, sdev,
390 "%s: failed to send MODE SELECT: %x\n",
391 CLARIION_NAME, rq->errors);
392 }
393 }
394
395 blk_put_request(rq);
396
397 return err;
398}
399
400static int clariion_check_sense(struct scsi_device *sdev,
401 struct scsi_sense_hdr *sense_hdr)
402{
403 switch (sense_hdr->sense_key) {
404 case NOT_READY:
405 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x03)
406 /*
407 * LUN Not Ready - Manual Intervention Required
408 * indicates this is a passive path.
409 *
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.
415 *
416 * Can return FAILED only when we want the error
417 * recovery process to kick in.
418 */
419 return SUCCESS;
420 break;
421 case ILLEGAL_REQUEST:
422 if (sense_hdr->asc == 0x25 && sense_hdr->ascq == 0x01)
423 /*
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.)
429 *
430 * Can return FAILED only when we want the error
431 * recovery process to kick in.
432 */
433 return SUCCESS;
434 break;
435 case UNIT_ATTENTION:
436 if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
437 /*
438 * Unit Attention Code. This is the first IO
439 * to the new path, so just retry.
440 */
441 return ADD_TO_MLQUEUE;
442 break;
443 }
444
445 return SCSI_RETURN_NOT_HANDLED;
446}
447
448static int clariion_prep_fn(struct scsi_device *sdev, struct request *req)
449{
450 struct clariion_dh_data *h = sdev->handler_data;
451 int ret = BLKPREP_OK;
452
453 if (h->lun_state != CLARIION_LUN_OWNED) {
454 ret = BLKPREP_KILL;
455 req->cmd_flags |= REQ_QUIET;
456 }
457 return ret;
458
459}
460
461static int clariion_std_inquiry(struct scsi_device *sdev,
462 struct clariion_dh_data *csdev)
463{
464 int err;
465 char *sp_model;
466
467 err = send_inquiry_cmd(sdev, 0, csdev);
468 if (err != SCSI_DH_OK && csdev->senselen) {
469 struct scsi_sense_hdr sshdr;
470
471 if (scsi_normalize_sense(csdev->sense, SCSI_SENSE_BUFFERSIZE,
472 &sshdr)) {
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);
476 }
477 err = SCSI_DH_IO;
478 goto out;
479 }
480
481 sp_model = parse_sp_model(sdev, csdev->buffer);
482 if (!sp_model) {
483 err = SCSI_DH_DEV_UNSUPP;
484 goto out;
485 }
486
487 /*
488 * FC Series arrays do not support long trespass
489 */
490 if (!strlen(sp_model) || !strncmp(sp_model, "FC",2))
491 csdev->flags |= CLARIION_SHORT_TRESPASS;
492
493 sdev_printk(KERN_INFO, sdev,
494 "%s: detected Clariion %s, flags %x\n",
495 CLARIION_NAME, sp_model, csdev->flags);
496out:
497 return err;
498}
499
500static int clariion_send_inquiry(struct scsi_device *sdev,
501 struct clariion_dh_data *csdev)
502{
503 int err, retry = CLARIION_RETRIES;
504
505retry:
506 err = send_inquiry_cmd(sdev, 0xC0, csdev);
507 if (err != SCSI_DH_OK && csdev->senselen) {
508 struct scsi_sense_hdr sshdr;
509
510 err = scsi_normalize_sense(csdev->sense, SCSI_SENSE_BUFFERSIZE,
511 &sshdr);
512 if (!err)
513 return SCSI_DH_IO;
514
515 err = clariion_check_sense(sdev, &sshdr);
516 if (retry > 0 && err == ADD_TO_MLQUEUE) {
517 retry--;
518 goto retry;
519 }
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);
523 err = SCSI_DH_IO;
524 } else {
525 err = parse_sp_info_reply(sdev, csdev);
526 }
527 return err;
528}
529
530static int clariion_activate(struct scsi_device *sdev,
531 activate_complete fn, void *data)
532{
533 struct clariion_dh_data *csdev = sdev->handler_data;
534 int result;
535
536 result = clariion_send_inquiry(sdev, csdev);
537 if (result != SCSI_DH_OK)
538 goto done;
539
540 if (csdev->lun_state == CLARIION_LUN_OWNED)
541 goto done;
542
543 result = send_trespass_cmd(sdev, csdev);
544 if (result != SCSI_DH_OK)
545 goto done;
546 sdev_printk(KERN_INFO, sdev,"%s: %s trespass command sent\n",
547 CLARIION_NAME,
548 csdev->flags&CLARIION_SHORT_TRESPASS?"short":"long" );
549
550 /* Update status */
551 result = clariion_send_inquiry(sdev, csdev);
552 if (result != SCSI_DH_OK)
553 goto done;
554
555done:
556 sdev_printk(KERN_INFO, sdev,
557 "%s: at SP %c Port %d (%s, default SP %c)\n",
558 CLARIION_NAME, csdev->current_sp + 'A',
559 csdev->port, lun_state[csdev->lun_state],
560 csdev->default_sp + 'A');
561
562 if (fn)
563 fn(data, result);
564 return 0;
565}
566/*
567 * params - parameters in the following format
568 * "no_of_params\0param1\0param2\0param3\0...\0"
569 * for example, string for 2 parameters with value 10 and 21
570 * is specified as "2\010\021\0".
571 */
572static int clariion_set_params(struct scsi_device *sdev, const char *params)
573{
574 struct clariion_dh_data *csdev = sdev->handler_data;
575 unsigned int hr = 0, st = 0, argc;
576 const char *p = params;
577 int result = SCSI_DH_OK;
578
579 if ((sscanf(params, "%u", &argc) != 1) || (argc != 2))
580 return -EINVAL;
581
582 while (*p++)
583 ;
584 if ((sscanf(p, "%u", &st) != 1) || (st > 1))
585 return -EINVAL;
586
587 while (*p++)
588 ;
589 if ((sscanf(p, "%u", &hr) != 1) || (hr > 1))
590 return -EINVAL;
591
592 if (st)
593 csdev->flags |= CLARIION_SHORT_TRESPASS;
594 else
595 csdev->flags &= ~CLARIION_SHORT_TRESPASS;
596
597 if (hr)
598 csdev->flags |= CLARIION_HONOR_RESERVATIONS;
599 else
600 csdev->flags &= ~CLARIION_HONOR_RESERVATIONS;
601
602 /*
603 * If this path is owned, we have to send a trespass command
604 * with the new parameters. If not, simply return. Next trespass
605 * command would use the parameters.
606 */
607 if (csdev->lun_state != CLARIION_LUN_OWNED)
608 goto done;
609
610 csdev->lun_state = CLARIION_LUN_UNINITIALIZED;
611 result = send_trespass_cmd(sdev, csdev);
612 if (result != SCSI_DH_OK)
613 goto done;
614
615 /* Update status */
616 result = clariion_send_inquiry(sdev, csdev);
617
618done:
619 return result;
620}
621
622static int clariion_bus_attach(struct scsi_device *sdev)
623{
624 struct clariion_dh_data *h;
625 int err;
626
627 h = kzalloc(sizeof(*h) , GFP_KERNEL);
628 if (!h)
629 return -ENOMEM;
630 h->lun_state = CLARIION_LUN_UNINITIALIZED;
631 h->default_sp = CLARIION_UNBOUND_LU;
632 h->current_sp = CLARIION_UNBOUND_LU;
633
634 err = clariion_std_inquiry(sdev, h);
635 if (err != SCSI_DH_OK)
636 goto failed;
637
638 err = clariion_send_inquiry(sdev, h);
639 if (err != SCSI_DH_OK)
640 goto failed;
641
642 sdev_printk(KERN_INFO, sdev,
643 "%s: connected to SP %c Port %d (%s, default SP %c)\n",
644 CLARIION_NAME, h->current_sp + 'A',
645 h->port, lun_state[h->lun_state],
646 h->default_sp + 'A');
647
648 sdev->handler_data = h;
649 return 0;
650
651failed:
652 kfree(h);
653 return -EINVAL;
654}
655
656static void clariion_bus_detach(struct scsi_device *sdev)
657{
658 kfree(sdev->handler_data);
659 sdev->handler_data = NULL;
660}
661
662static struct scsi_device_handler clariion_dh = {
663 .name = CLARIION_NAME,
664 .module = THIS_MODULE,
665 .attach = clariion_bus_attach,
666 .detach = clariion_bus_detach,
667 .check_sense = clariion_check_sense,
668 .activate = clariion_activate,
669 .prep_fn = clariion_prep_fn,
670 .set_params = clariion_set_params,
671};
672
673static int __init clariion_init(void)
674{
675 int r;
676
677 r = scsi_register_device_handler(&clariion_dh);
678 if (r != 0)
679 printk(KERN_ERR "%s: Failed to register scsi device handler.",
680 CLARIION_NAME);
681 return r;
682}
683
684static void __exit clariion_exit(void)
685{
686 scsi_unregister_device_handler(&clariion_dh);
687}
688
689module_init(clariion_init);
690module_exit(clariion_exit);
691
692MODULE_DESCRIPTION("EMC CX/AX/FC-family driver");
693MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, Chandra Seetharaman <sekharan@us.ibm.com>");
694MODULE_LICENSE("GPL");