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Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -07001/*
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 <scsi/scsi.h>
24#include <scsi/scsi_eh.h>
25#include <scsi/scsi_dh.h>
26#include <scsi/scsi_device.h>
27
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -070028#define CLARIION_NAME "emc"
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -070029
30#define CLARIION_TRESPASS_PAGE 0x22
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -070031#define CLARIION_BUFFER_SIZE 0xFC
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -070032#define CLARIION_TIMEOUT (60 * HZ)
33#define CLARIION_RETRIES 3
34#define CLARIION_UNBOUND_LU -1
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -070035#define CLARIION_SP_A 0
36#define CLARIION_SP_B 1
37
38/* Flags */
39#define CLARIION_SHORT_TRESPASS 1
40#define CLARIION_HONOR_RESERVATIONS 2
41
42/* LUN states */
43#define CLARIION_LUN_UNINITIALIZED -1
44#define CLARIION_LUN_UNBOUND 0
45#define CLARIION_LUN_BOUND 1
46#define CLARIION_LUN_OWNED 2
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -070047
48static unsigned char long_trespass[] = {
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -070049 0, 0, 0, 0, 0, 0, 0, 0,
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -070050 CLARIION_TRESPASS_PAGE, /* Page code */
51 0x09, /* Page length - 2 */
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -070052 0x01, /* Trespass code */
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -070053 0xff, 0xff, /* Trespass target */
54 0, 0, 0, 0, 0, 0 /* Reserved bytes / unknown */
55};
56
57static unsigned char short_trespass[] = {
58 0, 0, 0, 0,
59 CLARIION_TRESPASS_PAGE, /* Page code */
60 0x02, /* Page length - 2 */
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -070061 0x01, /* Trespass code */
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -070062 0xff, /* Trespass target */
63};
64
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -070065static const char * lun_state[] =
66{
67 "not bound",
68 "bound",
69 "owned",
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -070070};
71
72struct clariion_dh_data {
73 /*
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -070074 * Flags:
75 * CLARIION_SHORT_TRESPASS
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -070076 * Use short trespass command (FC-series) or the long version
77 * (default for AX/CX CLARiiON arrays).
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -070078 *
79 * CLARIION_HONOR_RESERVATIONS
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -070080 * Whether or not (default) to honor SCSI reservations when
81 * initiating a switch-over.
82 */
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -070083 unsigned flags;
84 /*
85 * I/O buffer for both MODE_SELECT and INQUIRY commands.
86 */
James Bottomley7ae628d2008-09-23 07:58:59 -070087 unsigned char buffer[CLARIION_BUFFER_SIZE];
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -070088 /*
89 * SCSI sense buffer for commands -- assumes serial issuance
90 * and completion sequence of all commands for same multipath.
91 */
92 unsigned char sense[SCSI_SENSE_BUFFERSIZE];
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -070093 unsigned int senselen;
94 /*
95 * LUN state
96 */
97 int lun_state;
98 /*
99 * SP Port number
100 */
101 int port;
102 /*
103 * which SP (A=0,B=1,UNBOUND=-1) is the default SP for this
104 * path's mapped LUN
105 */
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700106 int default_sp;
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700107 /*
108 * which SP (A=0,B=1,UNBOUND=-1) is the active SP for this
109 * path's mapped LUN
110 */
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700111 int current_sp;
112};
113
114static inline struct clariion_dh_data
115 *get_clariion_data(struct scsi_device *sdev)
116{
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);
120}
121
122/*
123 * Parse MODE_SELECT cmd reply.
124 */
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700125static int trespass_endio(struct scsi_device *sdev, char *sense)
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700126{
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700127 int err = SCSI_DH_IO;
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700128 struct scsi_sense_hdr sshdr;
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700129
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700130 if (!scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)) {
131 sdev_printk(KERN_ERR, sdev, "%s: Found valid sense data 0x%2x, "
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700132 "0x%2x, 0x%2x while sending CLARiiON trespass "
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700133 "command.\n", CLARIION_NAME, sshdr.sense_key,
134 sshdr.asc, sshdr.ascq);
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700135
136 if ((sshdr.sense_key == 0x05) && (sshdr.asc == 0x04) &&
137 (sshdr.ascq == 0x00)) {
138 /*
139 * Array based copy in progress -- do not send
140 * mode_select or copy will be aborted mid-stream.
141 */
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700142 sdev_printk(KERN_INFO, sdev, "%s: Array Based Copy in "
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700143 "progress while sending CLARiiON trespass "
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700144 "command.\n", CLARIION_NAME);
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700145 err = SCSI_DH_DEV_TEMP_BUSY;
146 } else if ((sshdr.sense_key == 0x02) && (sshdr.asc == 0x04) &&
147 (sshdr.ascq == 0x03)) {
148 /*
149 * LUN Not Ready - Manual Intervention Required
150 * indicates in-progress ucode upgrade (NDU).
151 */
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700152 sdev_printk(KERN_INFO, sdev, "%s: Detected in-progress "
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700153 "ucode upgrade NDU operation while sending "
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700154 "CLARiiON trespass command.\n", CLARIION_NAME);
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700155 err = SCSI_DH_DEV_TEMP_BUSY;
156 } else
157 err = SCSI_DH_DEV_FAILED;
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700158 } else {
159 sdev_printk(KERN_INFO, sdev,
160 "%s: failed to send MODE SELECT, no sense available\n",
161 CLARIION_NAME);
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700162 }
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700163 return err;
164}
165
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700166static int parse_sp_info_reply(struct scsi_device *sdev,
167 struct clariion_dh_data *csdev)
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700168{
169 int err = SCSI_DH_OK;
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700170
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700171 /* 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;
177 goto out;
178 }
James Bottomley7ae628d2008-09-23 07:58:59 -0700179 if (csdev->buffer[4] > 2) {
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700180 /* Invalid buffer format */
181 sdev_printk(KERN_NOTICE, sdev,
182 "%s: invalid VPD page 0xC0 format\n",
183 CLARIION_NAME);
184 err = SCSI_DH_NOSYS;
185 goto out;
186 }
187 switch (csdev->buffer[28] & 0x0f) {
188 case 6:
189 sdev_printk(KERN_NOTICE, sdev,
190 "%s: ALUA failover mode detected\n",
191 CLARIION_NAME);
192 break;
193 case 4:
194 /* Linux failover */
195 break;
196 default:
197 sdev_printk(KERN_WARNING, sdev,
198 "%s: Invalid failover mode %d\n",
199 CLARIION_NAME, csdev->buffer[28] & 0x0f);
200 err = SCSI_DH_NOSYS;
201 goto out;
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700202 }
203
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700204 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];
208
209out:
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700210 return err;
211}
212
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700213#define emc_default_str "FC (Legacy)"
214
215static char * parse_sp_model(struct scsi_device *sdev, unsigned char *buffer)
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700216{
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700217 unsigned char len = buffer[4] + 5;
218 char *sp_model = NULL;
219 unsigned char sp_len, serial_len;
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700220
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700221 if (len < 160) {
222 sdev_printk(KERN_WARNING, sdev,
223 "%s: Invalid information section length %d\n",
224 CLARIION_NAME, len);
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;
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700229 }
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700230 goto out;
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700231 }
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700232
233 /*
234 * Parse extended information for SP model number
235 */
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);
241 goto out;
242 }
243 sp_len = buffer[99];
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);
248 goto out;
249 }
250 sp_model = &buffer[serial_len + 161];
251 /* Strip whitespace at the end */
252 while (sp_len > 1 && sp_model[sp_len - 1] == ' ')
253 sp_len--;
254
255 sp_model[sp_len] = '\0';
256
257out:
258 return sp_model;
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700259}
260
261/*
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700262 * Get block request for REQ_BLOCK_PC command issued to path. Currently
263 * limited to MODE_SELECT (trespass) and INQUIRY (VPD page 0xC0) commands.
264 *
265 * Uses data and sense buffers in hardware handler context structure and
266 * assumes serial servicing of commands, both issuance and completion.
267 */
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700268static struct request *get_req(struct scsi_device *sdev, int cmd,
269 unsigned char *buffer)
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700270{
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700271 struct request *rq;
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700272 int len = 0;
273
274 rq = blk_get_request(sdev->request_queue,
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700275 (cmd == MODE_SELECT) ? WRITE : READ, GFP_NOIO);
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700276 if (!rq) {
277 sdev_printk(KERN_INFO, sdev, "get_req: blk_get_request failed");
278 return NULL;
279 }
280
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700281 rq->cmd_len = COMMAND_SIZE(cmd);
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700282 rq->cmd[0] = cmd;
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700283
284 switch (cmd) {
285 case MODE_SELECT:
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700286 len = sizeof(short_trespass);
287 rq->cmd_flags |= REQ_RW;
288 rq->cmd[1] = 0x10;
289 break;
290 case MODE_SELECT_10:
291 len = sizeof(long_trespass);
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700292 rq->cmd_flags |= REQ_RW;
293 rq->cmd[1] = 0x10;
294 break;
295 case INQUIRY:
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700296 len = CLARIION_BUFFER_SIZE;
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700297 memset(buffer, 0, len);
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700298 break;
299 default:
300 BUG_ON(1);
301 break;
302 }
303
304 rq->cmd[4] = len;
305 rq->cmd_type = REQ_TYPE_BLOCK_PC;
Mike Christie6000a362008-08-19 18:45:30 -0500306 rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
307 REQ_FAILFAST_DRIVER;
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700308 rq->timeout = CLARIION_TIMEOUT;
309 rq->retries = CLARIION_RETRIES;
310
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700311 if (blk_rq_map_kern(rq->q, rq, buffer, len, GFP_NOIO)) {
312 blk_put_request(rq);
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700313 return NULL;
314 }
315
316 return rq;
317}
318
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700319static int send_inquiry_cmd(struct scsi_device *sdev, int page,
320 struct clariion_dh_data *csdev)
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700321{
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700322 struct request *rq = get_req(sdev, INQUIRY, csdev->buffer);
323 int err;
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700324
325 if (!rq)
326 return SCSI_DH_RES_TEMP_UNAVAIL;
327
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700328 rq->sense = csdev->sense;
329 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
330 rq->sense_len = csdev->senselen = 0;
331
332 rq->cmd[0] = INQUIRY;
333 if (page != 0) {
334 rq->cmd[1] = 1;
335 rq->cmd[2] = page;
336 }
337 err = blk_execute_rq(sdev->request_queue, NULL, rq, 1);
338 if (err == -EIO) {
339 sdev_printk(KERN_INFO, sdev,
340 "%s: failed to send %s INQUIRY: %x\n",
341 CLARIION_NAME, page?"EVPD":"standard",
342 rq->errors);
343 csdev->senselen = rq->sense_len;
344 err = SCSI_DH_IO;
345 }
346
347 blk_put_request(rq);
348
349 return err;
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700350}
351
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700352static int send_trespass_cmd(struct scsi_device *sdev,
353 struct clariion_dh_data *csdev)
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700354{
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700355 struct request *rq;
356 unsigned char *page22;
357 int err, len, cmd;
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700358
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700359 if (csdev->flags & CLARIION_SHORT_TRESPASS) {
360 page22 = short_trespass;
361 if (!(csdev->flags & CLARIION_HONOR_RESERVATIONS))
362 /* Set Honor Reservations bit */
363 page22[6] |= 0x80;
364 len = sizeof(short_trespass);
365 cmd = MODE_SELECT;
366 } else {
367 page22 = long_trespass;
368 if (!(csdev->flags & CLARIION_HONOR_RESERVATIONS))
369 /* Set Honor Reservations bit */
370 page22[10] |= 0x80;
371 len = sizeof(long_trespass);
372 cmd = MODE_SELECT_10;
373 }
374 BUG_ON((len > CLARIION_BUFFER_SIZE));
375 memcpy(csdev->buffer, page22, len);
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700376
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700377 rq = get_req(sdev, cmd, csdev->buffer);
378 if (!rq)
379 return SCSI_DH_RES_TEMP_UNAVAIL;
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700380
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700381 rq->sense = csdev->sense;
382 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
383 rq->sense_len = csdev->senselen = 0;
384
385 err = blk_execute_rq(sdev->request_queue, NULL, rq, 1);
386 if (err == -EIO) {
387 if (rq->sense_len) {
388 err = trespass_endio(sdev, csdev->sense);
389 } else {
390 sdev_printk(KERN_INFO, sdev,
391 "%s: failed to send MODE SELECT: %x\n",
392 CLARIION_NAME, rq->errors);
393 }
394 }
395
396 blk_put_request(rq);
397
398 return err;
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700399}
400
401static int clariion_check_sense(struct scsi_device *sdev,
402 struct scsi_sense_hdr *sense_hdr)
403{
404 switch (sense_hdr->sense_key) {
405 case NOT_READY:
406 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x03)
407 /*
408 * LUN Not Ready - Manual Intervention Required
409 * indicates this is a passive path.
410 *
411 * FIXME: However, if this is seen and EVPD C0
412 * indicates that this is due to a NDU in
413 * progress, we should set FAIL_PATH too.
414 * This indicates we might have to do a SCSI
415 * inquiry in the end_io path. Ugh.
416 *
417 * Can return FAILED only when we want the error
418 * recovery process to kick in.
419 */
420 return SUCCESS;
421 break;
422 case ILLEGAL_REQUEST:
423 if (sense_hdr->asc == 0x25 && sense_hdr->ascq == 0x01)
424 /*
425 * An array based copy is in progress. Do not
426 * fail the path, do not bypass to another PG,
427 * do not retry. Fail the IO immediately.
428 * (Actually this is the same conclusion as in
429 * the default handler, but lets make sure.)
430 *
431 * Can return FAILED only when we want the error
432 * recovery process to kick in.
433 */
434 return SUCCESS;
435 break;
436 case UNIT_ATTENTION:
437 if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
438 /*
439 * Unit Attention Code. This is the first IO
440 * to the new path, so just retry.
441 */
Mike Andersonc7dbb622008-08-12 12:11:57 -0700442 return ADD_TO_MLQUEUE;
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700443 break;
444 }
445
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700446 return SCSI_RETURN_NOT_HANDLED;
447}
448
449static int clariion_prep_fn(struct scsi_device *sdev, struct request *req)
450{
451 struct clariion_dh_data *h = get_clariion_data(sdev);
452 int ret = BLKPREP_OK;
453
454 if (h->lun_state != CLARIION_LUN_OWNED) {
455 ret = BLKPREP_KILL;
456 req->cmd_flags |= REQ_QUIET;
457 }
458 return ret;
459
460}
461
462static int clariion_std_inquiry(struct scsi_device *sdev,
463 struct clariion_dh_data *csdev)
464{
465 int err;
466 char *sp_model;
467
468 err = send_inquiry_cmd(sdev, 0, csdev);
469 if (err != SCSI_DH_OK && csdev->senselen) {
470 struct scsi_sense_hdr sshdr;
471
472 if (scsi_normalize_sense(csdev->sense, SCSI_SENSE_BUFFERSIZE,
473 &sshdr)) {
474 sdev_printk(KERN_ERR, sdev, "%s: INQUIRY sense code "
475 "%02x/%02x/%02x\n", CLARIION_NAME,
476 sshdr.sense_key, sshdr.asc, sshdr.ascq);
477 }
478 err = SCSI_DH_IO;
479 goto out;
480 }
481
482 sp_model = parse_sp_model(sdev, csdev->buffer);
483 if (!sp_model) {
484 err = SCSI_DH_DEV_UNSUPP;
485 goto out;
486 }
487
488 /*
489 * FC Series arrays do not support long trespass
490 */
491 if (!strlen(sp_model) || !strncmp(sp_model, "FC",2))
492 csdev->flags |= CLARIION_SHORT_TRESPASS;
493
494 sdev_printk(KERN_INFO, sdev,
495 "%s: detected Clariion %s, flags %x\n",
496 CLARIION_NAME, sp_model, csdev->flags);
497out:
498 return err;
499}
500
501static int clariion_send_inquiry(struct scsi_device *sdev,
502 struct clariion_dh_data *csdev)
503{
504 int err, retry = CLARIION_RETRIES;
505
506retry:
507 err = send_inquiry_cmd(sdev, 0xC0, csdev);
508 if (err != SCSI_DH_OK && csdev->senselen) {
509 struct scsi_sense_hdr sshdr;
510
511 err = scsi_normalize_sense(csdev->sense, SCSI_SENSE_BUFFERSIZE,
512 &sshdr);
513 if (!err)
514 return SCSI_DH_IO;
515
516 err = clariion_check_sense(sdev, &sshdr);
Mike Andersonc7dbb622008-08-12 12:11:57 -0700517 if (retry > 0 && err == ADD_TO_MLQUEUE) {
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700518 retry--;
519 goto retry;
520 }
521 sdev_printk(KERN_ERR, sdev, "%s: INQUIRY sense code "
522 "%02x/%02x/%02x\n", CLARIION_NAME,
523 sshdr.sense_key, sshdr.asc, sshdr.ascq);
524 err = SCSI_DH_IO;
525 } else {
526 err = parse_sp_info_reply(sdev, csdev);
527 }
528 return err;
529}
530
531static int clariion_activate(struct scsi_device *sdev)
532{
533 struct clariion_dh_data *csdev = get_clariion_data(sdev);
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 return result;
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700563}
564
Adrian Bunkf08c0762008-08-11 11:59:21 -0700565static const struct scsi_dh_devlist clariion_dev_list[] = {
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700566 {"DGC", "RAID"},
567 {"DGC", "DISK"},
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700568 {"DGC", "VRAID"},
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700569 {NULL, NULL},
570};
571
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700572static int clariion_bus_attach(struct scsi_device *sdev);
573static void clariion_bus_detach(struct scsi_device *sdev);
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700574
575static struct scsi_device_handler clariion_dh = {
576 .name = CLARIION_NAME,
577 .module = THIS_MODULE,
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700578 .devlist = clariion_dev_list,
579 .attach = clariion_bus_attach,
580 .detach = clariion_bus_detach,
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700581 .check_sense = clariion_check_sense,
582 .activate = clariion_activate,
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700583 .prep_fn = clariion_prep_fn,
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700584};
585
586/*
587 * TODO: need some interface so we can set trespass values
588 */
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700589static int clariion_bus_attach(struct scsi_device *sdev)
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700590{
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700591 struct scsi_dh_data *scsi_dh_data;
592 struct clariion_dh_data *h;
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700593 unsigned long flags;
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700594 int err;
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700595
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700596 scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *)
597 + sizeof(*h) , GFP_KERNEL);
598 if (!scsi_dh_data) {
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700599 sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n",
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700600 CLARIION_NAME);
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700601 return -ENOMEM;
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700602 }
603
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700604 scsi_dh_data->scsi_dh = &clariion_dh;
605 h = (struct clariion_dh_data *) scsi_dh_data->buf;
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700606 h->lun_state = CLARIION_LUN_UNINITIALIZED;
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700607 h->default_sp = CLARIION_UNBOUND_LU;
608 h->current_sp = CLARIION_UNBOUND_LU;
609
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700610 err = clariion_std_inquiry(sdev, h);
611 if (err != SCSI_DH_OK)
612 goto failed;
613
614 err = clariion_send_inquiry(sdev, h);
615 if (err != SCSI_DH_OK)
616 goto failed;
617
618 if (!try_module_get(THIS_MODULE))
619 goto failed;
620
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700621 spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
622 sdev->scsi_dh_data = scsi_dh_data;
623 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
624
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700625 sdev_printk(KERN_INFO, sdev,
626 "%s: connected to SP %c Port %d (%s, default SP %c)\n",
627 CLARIION_NAME, h->current_sp + 'A',
628 h->port, lun_state[h->lun_state],
629 h->default_sp + 'A');
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700630
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700631 return 0;
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700632
633failed:
634 kfree(scsi_dh_data);
635 sdev_printk(KERN_ERR, sdev, "%s: not attached\n",
636 CLARIION_NAME);
637 return -EINVAL;
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700638}
639
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700640static void clariion_bus_detach(struct scsi_device *sdev)
641{
642 struct scsi_dh_data *scsi_dh_data;
643 unsigned long flags;
644
645 spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
646 scsi_dh_data = sdev->scsi_dh_data;
647 sdev->scsi_dh_data = NULL;
648 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
649
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700650 sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n",
Hannes Reinecke765cbc62008-07-17 16:52:51 -0700651 CLARIION_NAME);
652
653 kfree(scsi_dh_data);
654 module_put(THIS_MODULE);
655}
656
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700657static int __init clariion_init(void)
658{
659 int r;
660
661 r = scsi_register_device_handler(&clariion_dh);
662 if (r != 0)
Hannes Reineckeb6ff1b12008-07-17 16:53:03 -0700663 printk(KERN_ERR "%s: Failed to register scsi device handler.",
664 CLARIION_NAME);
Chandra Seetharaman5e7dcca2008-05-01 14:50:04 -0700665 return r;
666}
667
668static void __exit clariion_exit(void)
669{
670 scsi_unregister_device_handler(&clariion_dh);
671}
672
673module_init(clariion_init);
674module_exit(clariion_exit);
675
676MODULE_DESCRIPTION("EMC CX/AX/FC-family driver");
677MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, Chandra Seetharaman <sekharan@us.ibm.com>");
678MODULE_LICENSE("GPL");