/drivers/scsi/device_handler/scsi_dh_emc.c
C | 737 lines | 515 code | 95 blank | 127 comment | 112 complexity | 74fcfdc77b13168553d479822163d23b MD5 | raw file
Possible License(s): CC-BY-SA-3.0, GPL-2.0, LGPL-2.0, AGPL-1.0
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_flags |= REQ_RW;
289 rq->cmd[1] = 0x10;
290 rq->cmd[4] = len;
291 break;
292 case MODE_SELECT_10:
293 len = sizeof(long_trespass);
294 rq->cmd_flags |= REQ_RW;
295 rq->cmd[1] = 0x10;
296 rq->cmd[8] = len;
297 break;
298 case INQUIRY:
299 len = CLARIION_BUFFER_SIZE;
300 rq->cmd[4] = len;
301 memset(buffer, 0, len);
302 break;
303 default:
304 BUG_ON(1);
305 break;
306 }
307
308 rq->cmd_type = REQ_TYPE_BLOCK_PC;
309 rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
310 REQ_FAILFAST_DRIVER;
311 rq->timeout = CLARIION_TIMEOUT;
312 rq->retries = CLARIION_RETRIES;
313
314 if (blk_rq_map_kern(rq->q, rq, buffer, len, GFP_NOIO)) {
315 blk_put_request(rq);
316 return NULL;
317 }
318
319 return rq;
320}
321
322static int send_inquiry_cmd(struct scsi_device *sdev, int page,
323 struct clariion_dh_data *csdev)
324{
325 struct request *rq = get_req(sdev, INQUIRY, csdev->buffer);
326 int err;
327
328 if (!rq)
329 return SCSI_DH_RES_TEMP_UNAVAIL;
330
331 rq->sense = csdev->sense;
332 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
333 rq->sense_len = csdev->senselen = 0;
334
335 rq->cmd[0] = INQUIRY;
336 if (page != 0) {
337 rq->cmd[1] = 1;
338 rq->cmd[2] = page;
339 }
340 err = blk_execute_rq(sdev->request_queue, NULL, rq, 1);
341 if (err == -EIO) {
342 sdev_printk(KERN_INFO, sdev,
343 "%s: failed to send %s INQUIRY: %x\n",
344 CLARIION_NAME, page?"EVPD":"standard",
345 rq->errors);
346 csdev->senselen = rq->sense_len;
347 err = SCSI_DH_IO;
348 }
349
350 blk_put_request(rq);
351
352 return err;
353}
354
355static int send_trespass_cmd(struct scsi_device *sdev,
356 struct clariion_dh_data *csdev)
357{
358 struct request *rq;
359 unsigned char *page22;
360 int err, len, cmd;
361
362 if (csdev->flags & CLARIION_SHORT_TRESPASS) {
363 page22 = short_trespass;
364 if (!(csdev->flags & CLARIION_HONOR_RESERVATIONS))
365 /* Set Honor Reservations bit */
366 page22[6] |= 0x80;
367 len = sizeof(short_trespass);
368 cmd = MODE_SELECT;
369 } else {
370 page22 = long_trespass;
371 if (!(csdev->flags & CLARIION_HONOR_RESERVATIONS))
372 /* Set Honor Reservations bit */
373 page22[10] |= 0x80;
374 len = sizeof(long_trespass);
375 cmd = MODE_SELECT_10;
376 }
377 BUG_ON((len > CLARIION_BUFFER_SIZE));
378 memcpy(csdev->buffer, page22, len);
379
380 rq = get_req(sdev, cmd, csdev->buffer);
381 if (!rq)
382 return SCSI_DH_RES_TEMP_UNAVAIL;
383
384 rq->sense = csdev->sense;
385 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
386 rq->sense_len = csdev->senselen = 0;
387
388 err = blk_execute_rq(sdev->request_queue, NULL, rq, 1);
389 if (err == -EIO) {
390 if (rq->sense_len) {
391 err = trespass_endio(sdev, csdev->sense);
392 } else {
393 sdev_printk(KERN_INFO, sdev,
394 "%s: failed to send MODE SELECT: %x\n",
395 CLARIION_NAME, rq->errors);
396 }
397 }
398
399 blk_put_request(rq);
400
401 return err;
402}
403
404static int clariion_check_sense(struct scsi_device *sdev,
405 struct scsi_sense_hdr *sense_hdr)
406{
407 switch (sense_hdr->sense_key) {
408 case NOT_READY:
409 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x03)
410 /*
411 * LUN Not Ready - Manual Intervention Required
412 * indicates this is a passive path.
413 *
414 * FIXME: However, if this is seen and EVPD C0
415 * indicates that this is due to a NDU in
416 * progress, we should set FAIL_PATH too.
417 * This indicates we might have to do a SCSI
418 * inquiry in the end_io path. Ugh.
419 *
420 * Can return FAILED only when we want the error
421 * recovery process to kick in.
422 */
423 return SUCCESS;
424 break;
425 case ILLEGAL_REQUEST:
426 if (sense_hdr->asc == 0x25 && sense_hdr->ascq == 0x01)
427 /*
428 * An array based copy is in progress. Do not
429 * fail the path, do not bypass to another PG,
430 * do not retry. Fail the IO immediately.
431 * (Actually this is the same conclusion as in
432 * the default handler, but lets make sure.)
433 *
434 * Can return FAILED only when we want the error
435 * recovery process to kick in.
436 */
437 return SUCCESS;
438 break;
439 case UNIT_ATTENTION:
440 if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
441 /*
442 * Unit Attention Code. This is the first IO
443 * to the new path, so just retry.
444 */
445 return ADD_TO_MLQUEUE;
446 break;
447 }
448
449 return SCSI_RETURN_NOT_HANDLED;
450}
451
452static int clariion_prep_fn(struct scsi_device *sdev, struct request *req)
453{
454 struct clariion_dh_data *h = get_clariion_data(sdev);
455 int ret = BLKPREP_OK;
456
457 if (h->lun_state != CLARIION_LUN_OWNED) {
458 ret = BLKPREP_KILL;
459 req->cmd_flags |= REQ_QUIET;
460 }
461 return ret;
462
463}
464
465static int clariion_std_inquiry(struct scsi_device *sdev,
466 struct clariion_dh_data *csdev)
467{
468 int err;
469 char *sp_model;
470
471 err = send_inquiry_cmd(sdev, 0, csdev);
472 if (err != SCSI_DH_OK && csdev->senselen) {
473 struct scsi_sense_hdr sshdr;
474
475 if (scsi_normalize_sense(csdev->sense, SCSI_SENSE_BUFFERSIZE,
476 &sshdr)) {
477 sdev_printk(KERN_ERR, sdev, "%s: INQUIRY sense code "
478 "%02x/%02x/%02x\n", CLARIION_NAME,
479 sshdr.sense_key, sshdr.asc, sshdr.ascq);
480 }
481 err = SCSI_DH_IO;
482 goto out;
483 }
484
485 sp_model = parse_sp_model(sdev, csdev->buffer);
486 if (!sp_model) {
487 err = SCSI_DH_DEV_UNSUPP;
488 goto out;
489 }
490
491 /*
492 * FC Series arrays do not support long trespass
493 */
494 if (!strlen(sp_model) || !strncmp(sp_model, "FC",2))
495 csdev->flags |= CLARIION_SHORT_TRESPASS;
496
497 sdev_printk(KERN_INFO, sdev,
498 "%s: detected Clariion %s, flags %x\n",
499 CLARIION_NAME, sp_model, csdev->flags);
500out:
501 return err;
502}
503
504static int clariion_send_inquiry(struct scsi_device *sdev,
505 struct clariion_dh_data *csdev)
506{
507 int err, retry = CLARIION_RETRIES;
508
509retry:
510 err = send_inquiry_cmd(sdev, 0xC0, csdev);
511 if (err != SCSI_DH_OK && csdev->senselen) {
512 struct scsi_sense_hdr sshdr;
513
514 err = scsi_normalize_sense(csdev->sense, SCSI_SENSE_BUFFERSIZE,
515 &sshdr);
516 if (!err)
517 return SCSI_DH_IO;
518
519 err = clariion_check_sense(sdev, &sshdr);
520 if (retry > 0 && err == ADD_TO_MLQUEUE) {
521 retry--;
522 goto retry;
523 }
524 sdev_printk(KERN_ERR, sdev, "%s: INQUIRY sense code "
525 "%02x/%02x/%02x\n", CLARIION_NAME,
526 sshdr.sense_key, sshdr.asc, sshdr.ascq);
527 err = SCSI_DH_IO;
528 } else {
529 err = parse_sp_info_reply(sdev, csdev);
530 }
531 return err;
532}
533
534static int clariion_activate(struct scsi_device *sdev,
535 activate_complete fn, void *data)
536{
537 struct clariion_dh_data *csdev = get_clariion_data(sdev);
538 int result;
539
540 result = clariion_send_inquiry(sdev, csdev);
541 if (result != SCSI_DH_OK)
542 goto done;
543
544 if (csdev->lun_state == CLARIION_LUN_OWNED)
545 goto done;
546
547 result = send_trespass_cmd(sdev, csdev);
548 if (result != SCSI_DH_OK)
549 goto done;
550 sdev_printk(KERN_INFO, sdev,"%s: %s trespass command sent\n",
551 CLARIION_NAME,
552 csdev->flags&CLARIION_SHORT_TRESPASS?"short":"long" );
553
554 /* Update status */
555 result = clariion_send_inquiry(sdev, csdev);
556 if (result != SCSI_DH_OK)
557 goto done;
558
559done:
560 sdev_printk(KERN_INFO, sdev,
561 "%s: at SP %c Port %d (%s, default SP %c)\n",
562 CLARIION_NAME, csdev->current_sp + 'A',
563 csdev->port, lun_state[csdev->lun_state],
564 csdev->default_sp + 'A');
565
566 if (fn)
567 fn(data, result);
568 return 0;
569}
570/*
571 * params - parameters in the following format
572 * "no_of_params\0param1\0param2\0param3\0...\0"
573 * for example, string for 2 parameters with value 10 and 21
574 * is specified as "2\010\021\0".
575 */
576static int clariion_set_params(struct scsi_device *sdev, const char *params)
577{
578 struct clariion_dh_data *csdev = get_clariion_data(sdev);
579 unsigned int hr = 0, st = 0, argc;
580 const char *p = params;
581 int result = SCSI_DH_OK;
582
583 if ((sscanf(params, "%u", &argc) != 1) || (argc != 2))
584 return -EINVAL;
585
586 while (*p++)
587 ;
588 if ((sscanf(p, "%u", &st) != 1) || (st > 1))
589 return -EINVAL;
590
591 while (*p++)
592 ;
593 if ((sscanf(p, "%u", &hr) != 1) || (hr > 1))
594 return -EINVAL;
595
596 if (st)
597 csdev->flags |= CLARIION_SHORT_TRESPASS;
598 else
599 csdev->flags &= ~CLARIION_SHORT_TRESPASS;
600
601 if (hr)
602 csdev->flags |= CLARIION_HONOR_RESERVATIONS;
603 else
604 csdev->flags &= ~CLARIION_HONOR_RESERVATIONS;
605
606 /*
607 * If this path is owned, we have to send a trespass command
608 * with the new parameters. If not, simply return. Next trespass
609 * command would use the parameters.
610 */
611 if (csdev->lun_state != CLARIION_LUN_OWNED)
612 goto done;
613
614 csdev->lun_state = CLARIION_LUN_UNINITIALIZED;
615 result = send_trespass_cmd(sdev, csdev);
616 if (result != SCSI_DH_OK)
617 goto done;
618
619 /* Update status */
620 result = clariion_send_inquiry(sdev, csdev);
621
622done:
623 return result;
624}
625
626static const struct scsi_dh_devlist clariion_dev_list[] = {
627 {"DGC", "RAID"},
628 {"DGC", "DISK"},
629 {"DGC", "VRAID"},
630 {NULL, NULL},
631};
632
633static int clariion_bus_attach(struct scsi_device *sdev);
634static void clariion_bus_detach(struct scsi_device *sdev);
635
636static struct scsi_device_handler clariion_dh = {
637 .name = CLARIION_NAME,
638 .module = THIS_MODULE,
639 .devlist = clariion_dev_list,
640 .attach = clariion_bus_attach,
641 .detach = clariion_bus_detach,
642 .check_sense = clariion_check_sense,
643 .activate = clariion_activate,
644 .prep_fn = clariion_prep_fn,
645 .set_params = clariion_set_params,
646};
647
648static int clariion_bus_attach(struct scsi_device *sdev)
649{
650 struct scsi_dh_data *scsi_dh_data;
651 struct clariion_dh_data *h;
652 unsigned long flags;
653 int err;
654
655 scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *)
656 + sizeof(*h) , GFP_KERNEL);
657 if (!scsi_dh_data) {
658 sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n",
659 CLARIION_NAME);
660 return -ENOMEM;
661 }
662
663 scsi_dh_data->scsi_dh = &clariion_dh;
664 h = (struct clariion_dh_data *) scsi_dh_data->buf;
665 h->lun_state = CLARIION_LUN_UNINITIALIZED;
666 h->default_sp = CLARIION_UNBOUND_LU;
667 h->current_sp = CLARIION_UNBOUND_LU;
668
669 err = clariion_std_inquiry(sdev, h);
670 if (err != SCSI_DH_OK)
671 goto failed;
672
673 err = clariion_send_inquiry(sdev, h);
674 if (err != SCSI_DH_OK)
675 goto failed;
676
677 if (!try_module_get(THIS_MODULE))
678 goto failed;
679
680 spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
681 sdev->scsi_dh_data = scsi_dh_data;
682 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
683
684 sdev_printk(KERN_INFO, sdev,
685 "%s: connected to SP %c Port %d (%s, default SP %c)\n",
686 CLARIION_NAME, h->current_sp + 'A',
687 h->port, lun_state[h->lun_state],
688 h->default_sp + 'A');
689
690 return 0;
691
692failed:
693 kfree(scsi_dh_data);
694 sdev_printk(KERN_ERR, sdev, "%s: not attached\n",
695 CLARIION_NAME);
696 return -EINVAL;
697}
698
699static void clariion_bus_detach(struct scsi_device *sdev)
700{
701 struct scsi_dh_data *scsi_dh_data;
702 unsigned long flags;
703
704 spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
705 scsi_dh_data = sdev->scsi_dh_data;
706 sdev->scsi_dh_data = NULL;
707 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
708
709 sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n",
710 CLARIION_NAME);
711
712 kfree(scsi_dh_data);
713 module_put(THIS_MODULE);
714}
715
716static int __init clariion_init(void)
717{
718 int r;
719
720 r = scsi_register_device_handler(&clariion_dh);
721 if (r != 0)
722 printk(KERN_ERR "%s: Failed to register scsi device handler.",
723 CLARIION_NAME);
724 return r;
725}
726
727static void __exit clariion_exit(void)
728{
729 scsi_unregister_device_handler(&clariion_dh);
730}
731
732module_init(clariion_init);
733module_exit(clariion_exit);
734
735MODULE_DESCRIPTION("EMC CX/AX/FC-family driver");
736MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, Chandra Seetharaman <sekharan@us.ibm.com>");
737MODULE_LICENSE("GPL");