Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Basic HP/COMPAQ MSA 1000 support. This is only needed if your HW cannot be |
| 3 | * upgraded. |
| 4 | * |
| 5 | * Copyright (C) 2006 Red Hat, Inc. All rights reserved. |
| 6 | * Copyright (C) 2006 Mike Christie |
Hannes Reinecke | 2aef6d5 | 2008-07-17 16:53:09 -0700 | [diff] [blame] | 7 | * Copyright (C) 2008 Hannes Reinecke <hare@suse.de> |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 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 | |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 24 | #include <linux/slab.h> |
Paul Gortmaker | acf3368f | 2011-05-27 09:47:43 -0400 | [diff] [blame] | 25 | #include <linux/module.h> |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 26 | #include <scsi/scsi.h> |
| 27 | #include <scsi/scsi_dbg.h> |
| 28 | #include <scsi/scsi_eh.h> |
| 29 | #include <scsi/scsi_dh.h> |
| 30 | |
Hannes Reinecke | 2aef6d5 | 2008-07-17 16:53:09 -0700 | [diff] [blame] | 31 | #define HP_SW_NAME "hp_sw" |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 32 | |
Hannes Reinecke | 2aef6d5 | 2008-07-17 16:53:09 -0700 | [diff] [blame] | 33 | #define HP_SW_TIMEOUT (60 * HZ) |
| 34 | #define HP_SW_RETRIES 3 |
| 35 | |
| 36 | #define HP_SW_PATH_UNINITIALIZED -1 |
| 37 | #define HP_SW_PATH_ACTIVE 0 |
| 38 | #define HP_SW_PATH_PASSIVE 1 |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 39 | |
| 40 | struct hp_sw_dh_data { |
| 41 | unsigned char sense[SCSI_SENSE_BUFFERSIZE]; |
Hannes Reinecke | 2aef6d5 | 2008-07-17 16:53:09 -0700 | [diff] [blame] | 42 | int path_state; |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 43 | int retries; |
Chandra Seetharaman | 4e2ef86 | 2009-10-21 09:22:58 -0700 | [diff] [blame] | 44 | int retry_cnt; |
| 45 | struct scsi_device *sdev; |
| 46 | activate_complete callback_fn; |
| 47 | void *callback_data; |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 48 | }; |
| 49 | |
Chandra Seetharaman | 4e2ef86 | 2009-10-21 09:22:58 -0700 | [diff] [blame] | 50 | static int hp_sw_start_stop(struct hp_sw_dh_data *); |
| 51 | |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 52 | static inline struct hp_sw_dh_data *get_hp_sw_data(struct scsi_device *sdev) |
| 53 | { |
| 54 | struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data; |
| 55 | BUG_ON(scsi_dh_data == NULL); |
| 56 | return ((struct hp_sw_dh_data *) scsi_dh_data->buf); |
| 57 | } |
| 58 | |
Hannes Reinecke | 2aef6d5 | 2008-07-17 16:53:09 -0700 | [diff] [blame] | 59 | /* |
| 60 | * tur_done - Handle TEST UNIT READY return status |
| 61 | * @sdev: sdev the command has been sent to |
| 62 | * @errors: blk error code |
| 63 | * |
| 64 | * Returns SCSI_DH_DEV_OFFLINED if the sdev is on the passive path |
| 65 | */ |
| 66 | static int tur_done(struct scsi_device *sdev, unsigned char *sense) |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 67 | { |
Hannes Reinecke | 2aef6d5 | 2008-07-17 16:53:09 -0700 | [diff] [blame] | 68 | struct scsi_sense_hdr sshdr; |
| 69 | int ret; |
| 70 | |
| 71 | ret = scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr); |
| 72 | if (!ret) { |
| 73 | sdev_printk(KERN_WARNING, sdev, |
| 74 | "%s: sending tur failed, no sense available\n", |
| 75 | HP_SW_NAME); |
| 76 | ret = SCSI_DH_IO; |
| 77 | goto done; |
| 78 | } |
| 79 | switch (sshdr.sense_key) { |
| 80 | case UNIT_ATTENTION: |
| 81 | ret = SCSI_DH_IMM_RETRY; |
| 82 | break; |
| 83 | case NOT_READY: |
| 84 | if ((sshdr.asc == 0x04) && (sshdr.ascq == 2)) { |
| 85 | /* |
| 86 | * LUN not ready - Initialization command required |
| 87 | * |
| 88 | * This is the passive path |
| 89 | */ |
| 90 | ret = SCSI_DH_DEV_OFFLINED; |
| 91 | break; |
| 92 | } |
| 93 | /* Fallthrough */ |
| 94 | default: |
| 95 | sdev_printk(KERN_WARNING, sdev, |
| 96 | "%s: sending tur failed, sense %x/%x/%x\n", |
| 97 | HP_SW_NAME, sshdr.sense_key, sshdr.asc, |
| 98 | sshdr.ascq); |
| 99 | break; |
| 100 | } |
| 101 | |
| 102 | done: |
| 103 | return ret; |
| 104 | } |
| 105 | |
| 106 | /* |
| 107 | * hp_sw_tur - Send TEST UNIT READY |
| 108 | * @sdev: sdev command should be sent to |
| 109 | * |
| 110 | * Use the TEST UNIT READY command to determine |
| 111 | * the path state. |
| 112 | */ |
| 113 | static int hp_sw_tur(struct scsi_device *sdev, struct hp_sw_dh_data *h) |
| 114 | { |
| 115 | struct request *req; |
| 116 | int ret; |
| 117 | |
Alan D. Brunelle | febd7a5 | 2008-12-09 15:52:15 +0100 | [diff] [blame] | 118 | retry: |
Hannes Reinecke | 2aef6d5 | 2008-07-17 16:53:09 -0700 | [diff] [blame] | 119 | req = blk_get_request(sdev->request_queue, WRITE, GFP_NOIO); |
| 120 | if (!req) |
| 121 | return SCSI_DH_RES_TEMP_UNAVAIL; |
| 122 | |
| 123 | req->cmd_type = REQ_TYPE_BLOCK_PC; |
Mike Christie | 6000a36 | 2008-08-19 18:45:30 -0500 | [diff] [blame] | 124 | req->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | |
| 125 | REQ_FAILFAST_DRIVER; |
Hannes Reinecke | 2aef6d5 | 2008-07-17 16:53:09 -0700 | [diff] [blame] | 126 | req->cmd_len = COMMAND_SIZE(TEST_UNIT_READY); |
Hannes Reinecke | 2aef6d5 | 2008-07-17 16:53:09 -0700 | [diff] [blame] | 127 | req->cmd[0] = TEST_UNIT_READY; |
| 128 | req->timeout = HP_SW_TIMEOUT; |
| 129 | req->sense = h->sense; |
| 130 | memset(req->sense, 0, SCSI_SENSE_BUFFERSIZE); |
| 131 | req->sense_len = 0; |
| 132 | |
Hannes Reinecke | 2aef6d5 | 2008-07-17 16:53:09 -0700 | [diff] [blame] | 133 | ret = blk_execute_rq(req->q, NULL, req, 1); |
| 134 | if (ret == -EIO) { |
| 135 | if (req->sense_len > 0) { |
| 136 | ret = tur_done(sdev, h->sense); |
| 137 | } else { |
| 138 | sdev_printk(KERN_WARNING, sdev, |
| 139 | "%s: sending tur failed with %x\n", |
| 140 | HP_SW_NAME, req->errors); |
| 141 | ret = SCSI_DH_IO; |
| 142 | } |
| 143 | } else { |
| 144 | h->path_state = HP_SW_PATH_ACTIVE; |
| 145 | ret = SCSI_DH_OK; |
| 146 | } |
Alan D. Brunelle | febd7a5 | 2008-12-09 15:52:15 +0100 | [diff] [blame] | 147 | if (ret == SCSI_DH_IMM_RETRY) { |
| 148 | blk_put_request(req); |
Hannes Reinecke | 2aef6d5 | 2008-07-17 16:53:09 -0700 | [diff] [blame] | 149 | goto retry; |
Alan D. Brunelle | febd7a5 | 2008-12-09 15:52:15 +0100 | [diff] [blame] | 150 | } |
Hannes Reinecke | 2aef6d5 | 2008-07-17 16:53:09 -0700 | [diff] [blame] | 151 | if (ret == SCSI_DH_DEV_OFFLINED) { |
| 152 | h->path_state = HP_SW_PATH_PASSIVE; |
| 153 | ret = SCSI_DH_OK; |
| 154 | } |
| 155 | |
| 156 | blk_put_request(req); |
| 157 | |
| 158 | return ret; |
| 159 | } |
| 160 | |
| 161 | /* |
| 162 | * start_done - Handle START STOP UNIT return status |
| 163 | * @sdev: sdev the command has been sent to |
| 164 | * @errors: blk error code |
| 165 | */ |
| 166 | static int start_done(struct scsi_device *sdev, unsigned char *sense) |
| 167 | { |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 168 | struct scsi_sense_hdr sshdr; |
| 169 | int rc; |
| 170 | |
Hannes Reinecke | 2aef6d5 | 2008-07-17 16:53:09 -0700 | [diff] [blame] | 171 | rc = scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr); |
| 172 | if (!rc) { |
| 173 | sdev_printk(KERN_WARNING, sdev, |
| 174 | "%s: sending start_stop_unit failed, " |
| 175 | "no sense available\n", |
| 176 | HP_SW_NAME); |
| 177 | return SCSI_DH_IO; |
| 178 | } |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 179 | switch (sshdr.sense_key) { |
| 180 | case NOT_READY: |
| 181 | if ((sshdr.asc == 0x04) && (sshdr.ascq == 3)) { |
Hannes Reinecke | 2aef6d5 | 2008-07-17 16:53:09 -0700 | [diff] [blame] | 182 | /* |
| 183 | * LUN not ready - manual intervention required |
| 184 | * |
| 185 | * Switch-over in progress, retry. |
| 186 | */ |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 187 | rc = SCSI_DH_RETRY; |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 188 | break; |
| 189 | } |
| 190 | /* fall through */ |
| 191 | default: |
Hannes Reinecke | 2aef6d5 | 2008-07-17 16:53:09 -0700 | [diff] [blame] | 192 | sdev_printk(KERN_WARNING, sdev, |
| 193 | "%s: sending start_stop_unit failed, sense %x/%x/%x\n", |
| 194 | HP_SW_NAME, sshdr.sense_key, sshdr.asc, |
| 195 | sshdr.ascq); |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 196 | rc = SCSI_DH_IO; |
| 197 | } |
Hannes Reinecke | 2aef6d5 | 2008-07-17 16:53:09 -0700 | [diff] [blame] | 198 | |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 199 | return rc; |
| 200 | } |
| 201 | |
Chandra Seetharaman | 4e2ef86 | 2009-10-21 09:22:58 -0700 | [diff] [blame] | 202 | static void start_stop_endio(struct request *req, int error) |
| 203 | { |
| 204 | struct hp_sw_dh_data *h = req->end_io_data; |
| 205 | unsigned err = SCSI_DH_OK; |
| 206 | |
| 207 | if (error || host_byte(req->errors) != DID_OK || |
| 208 | msg_byte(req->errors) != COMMAND_COMPLETE) { |
| 209 | sdev_printk(KERN_WARNING, h->sdev, |
| 210 | "%s: sending start_stop_unit failed with %x\n", |
| 211 | HP_SW_NAME, req->errors); |
| 212 | err = SCSI_DH_IO; |
| 213 | goto done; |
| 214 | } |
| 215 | |
| 216 | if (req->sense_len > 0) { |
| 217 | err = start_done(h->sdev, h->sense); |
| 218 | if (err == SCSI_DH_RETRY) { |
| 219 | err = SCSI_DH_IO; |
| 220 | if (--h->retry_cnt) { |
| 221 | blk_put_request(req); |
| 222 | err = hp_sw_start_stop(h); |
| 223 | if (err == SCSI_DH_OK) |
| 224 | return; |
| 225 | } |
| 226 | } |
| 227 | } |
| 228 | done: |
Mike Snitzer | 7a1e9d8 | 2011-01-25 11:52:17 -0500 | [diff] [blame] | 229 | req->end_io_data = NULL; |
| 230 | __blk_put_request(req->q, req); |
Chandra Seetharaman | 4e2ef86 | 2009-10-21 09:22:58 -0700 | [diff] [blame] | 231 | if (h->callback_fn) { |
| 232 | h->callback_fn(h->callback_data, err); |
| 233 | h->callback_fn = h->callback_data = NULL; |
| 234 | } |
| 235 | return; |
| 236 | |
| 237 | } |
| 238 | |
Hannes Reinecke | 2aef6d5 | 2008-07-17 16:53:09 -0700 | [diff] [blame] | 239 | /* |
| 240 | * hp_sw_start_stop - Send START STOP UNIT command |
| 241 | * @sdev: sdev command should be sent to |
| 242 | * |
| 243 | * Sending START STOP UNIT activates the SP. |
| 244 | */ |
Chandra Seetharaman | 4e2ef86 | 2009-10-21 09:22:58 -0700 | [diff] [blame] | 245 | static int hp_sw_start_stop(struct hp_sw_dh_data *h) |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 246 | { |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 247 | struct request *req; |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 248 | |
Chandra Seetharaman | 4e2ef86 | 2009-10-21 09:22:58 -0700 | [diff] [blame] | 249 | req = blk_get_request(h->sdev->request_queue, WRITE, GFP_ATOMIC); |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 250 | if (!req) |
Hannes Reinecke | 2aef6d5 | 2008-07-17 16:53:09 -0700 | [diff] [blame] | 251 | return SCSI_DH_RES_TEMP_UNAVAIL; |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 252 | |
| 253 | req->cmd_type = REQ_TYPE_BLOCK_PC; |
Mike Christie | 6000a36 | 2008-08-19 18:45:30 -0500 | [diff] [blame] | 254 | req->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | |
| 255 | REQ_FAILFAST_DRIVER; |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 256 | req->cmd_len = COMMAND_SIZE(START_STOP); |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 257 | req->cmd[0] = START_STOP; |
| 258 | req->cmd[4] = 1; /* Start spin cycle */ |
| 259 | req->timeout = HP_SW_TIMEOUT; |
| 260 | req->sense = h->sense; |
| 261 | memset(req->sense, 0, SCSI_SENSE_BUFFERSIZE); |
| 262 | req->sense_len = 0; |
Chandra Seetharaman | 4e2ef86 | 2009-10-21 09:22:58 -0700 | [diff] [blame] | 263 | req->end_io_data = h; |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 264 | |
Chandra Seetharaman | 4e2ef86 | 2009-10-21 09:22:58 -0700 | [diff] [blame] | 265 | blk_execute_rq_nowait(req->q, NULL, req, 1, start_stop_endio); |
| 266 | return SCSI_DH_OK; |
Hannes Reinecke | 2aef6d5 | 2008-07-17 16:53:09 -0700 | [diff] [blame] | 267 | } |
| 268 | |
| 269 | static int hp_sw_prep_fn(struct scsi_device *sdev, struct request *req) |
| 270 | { |
| 271 | struct hp_sw_dh_data *h = get_hp_sw_data(sdev); |
| 272 | int ret = BLKPREP_OK; |
| 273 | |
| 274 | if (h->path_state != HP_SW_PATH_ACTIVE) { |
| 275 | ret = BLKPREP_KILL; |
| 276 | req->cmd_flags |= REQ_QUIET; |
| 277 | } |
| 278 | return ret; |
| 279 | |
| 280 | } |
| 281 | |
| 282 | /* |
| 283 | * hp_sw_activate - Activate a path |
| 284 | * @sdev: sdev on the path to be activated |
| 285 | * |
| 286 | * The HP Active/Passive firmware is pretty simple; |
| 287 | * the passive path reports NOT READY with sense codes |
| 288 | * 0x04/0x02; a START STOP UNIT command will then |
| 289 | * activate the passive path (and deactivate the |
| 290 | * previously active one). |
| 291 | */ |
Chandra Seetharaman | 3ae31f6 | 2009-10-21 09:22:46 -0700 | [diff] [blame] | 292 | static int hp_sw_activate(struct scsi_device *sdev, |
| 293 | activate_complete fn, void *data) |
Hannes Reinecke | 2aef6d5 | 2008-07-17 16:53:09 -0700 | [diff] [blame] | 294 | { |
| 295 | int ret = SCSI_DH_OK; |
| 296 | struct hp_sw_dh_data *h = get_hp_sw_data(sdev); |
| 297 | |
| 298 | ret = hp_sw_tur(sdev, h); |
| 299 | |
| 300 | if (ret == SCSI_DH_OK && h->path_state == HP_SW_PATH_PASSIVE) { |
Chandra Seetharaman | 4e2ef86 | 2009-10-21 09:22:58 -0700 | [diff] [blame] | 301 | h->retry_cnt = h->retries; |
| 302 | h->callback_fn = fn; |
| 303 | h->callback_data = data; |
| 304 | ret = hp_sw_start_stop(h); |
Hannes Reinecke | 2aef6d5 | 2008-07-17 16:53:09 -0700 | [diff] [blame] | 305 | if (ret == SCSI_DH_OK) |
Chandra Seetharaman | 4e2ef86 | 2009-10-21 09:22:58 -0700 | [diff] [blame] | 306 | return 0; |
| 307 | h->callback_fn = h->callback_data = NULL; |
Hannes Reinecke | 2aef6d5 | 2008-07-17 16:53:09 -0700 | [diff] [blame] | 308 | } |
| 309 | |
Chandra Seetharaman | 3ae31f6 | 2009-10-21 09:22:46 -0700 | [diff] [blame] | 310 | if (fn) |
| 311 | fn(data, ret); |
| 312 | return 0; |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 313 | } |
| 314 | |
Adrian Bunk | f08c076 | 2008-08-11 11:59:21 -0700 | [diff] [blame] | 315 | static const struct scsi_dh_devlist hp_sw_dh_data_list[] = { |
Hannes Reinecke | 2aef6d5 | 2008-07-17 16:53:09 -0700 | [diff] [blame] | 316 | {"COMPAQ", "MSA1000 VOLUME"}, |
| 317 | {"COMPAQ", "HSV110"}, |
| 318 | {"HP", "HSV100"}, |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 319 | {"DEC", "HSG80"}, |
| 320 | {NULL, NULL}, |
| 321 | }; |
| 322 | |
Moger, Babu | a315969 | 2011-12-01 15:01:28 -0500 | [diff] [blame] | 323 | static bool hp_sw_match(struct scsi_device *sdev) |
| 324 | { |
| 325 | int i; |
| 326 | |
| 327 | if (scsi_device_tpgs(sdev)) |
| 328 | return false; |
| 329 | |
| 330 | for (i = 0; hp_sw_dh_data_list[i].vendor; i++) { |
| 331 | if (!strncmp(sdev->vendor, hp_sw_dh_data_list[i].vendor, |
| 332 | strlen(hp_sw_dh_data_list[i].vendor)) && |
| 333 | !strncmp(sdev->model, hp_sw_dh_data_list[i].model, |
| 334 | strlen(hp_sw_dh_data_list[i].model))) { |
| 335 | return true; |
| 336 | } |
| 337 | } |
| 338 | return false; |
| 339 | } |
| 340 | |
Hannes Reinecke | 765cbc6 | 2008-07-17 16:52:51 -0700 | [diff] [blame] | 341 | static int hp_sw_bus_attach(struct scsi_device *sdev); |
| 342 | static void hp_sw_bus_detach(struct scsi_device *sdev); |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 343 | |
| 344 | static struct scsi_device_handler hp_sw_dh = { |
| 345 | .name = HP_SW_NAME, |
| 346 | .module = THIS_MODULE, |
Hannes Reinecke | 765cbc6 | 2008-07-17 16:52:51 -0700 | [diff] [blame] | 347 | .devlist = hp_sw_dh_data_list, |
| 348 | .attach = hp_sw_bus_attach, |
| 349 | .detach = hp_sw_bus_detach, |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 350 | .activate = hp_sw_activate, |
Hannes Reinecke | 2aef6d5 | 2008-07-17 16:53:09 -0700 | [diff] [blame] | 351 | .prep_fn = hp_sw_prep_fn, |
Moger, Babu | a315969 | 2011-12-01 15:01:28 -0500 | [diff] [blame] | 352 | .match = hp_sw_match, |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 353 | }; |
| 354 | |
Hannes Reinecke | 765cbc6 | 2008-07-17 16:52:51 -0700 | [diff] [blame] | 355 | static int hp_sw_bus_attach(struct scsi_device *sdev) |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 356 | { |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 357 | struct scsi_dh_data *scsi_dh_data; |
Hannes Reinecke | 2aef6d5 | 2008-07-17 16:53:09 -0700 | [diff] [blame] | 358 | struct hp_sw_dh_data *h; |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 359 | unsigned long flags; |
Hannes Reinecke | 2aef6d5 | 2008-07-17 16:53:09 -0700 | [diff] [blame] | 360 | int ret; |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 361 | |
Hillf Danton | 9dfeb31 | 2011-02-11 15:17:33 -0700 | [diff] [blame] | 362 | scsi_dh_data = kzalloc(sizeof(*scsi_dh_data) |
| 363 | + sizeof(*h) , GFP_KERNEL); |
Hannes Reinecke | 765cbc6 | 2008-07-17 16:52:51 -0700 | [diff] [blame] | 364 | if (!scsi_dh_data) { |
Hannes Reinecke | 2aef6d5 | 2008-07-17 16:53:09 -0700 | [diff] [blame] | 365 | sdev_printk(KERN_ERR, sdev, "%s: Attach Failed\n", |
Hannes Reinecke | 765cbc6 | 2008-07-17 16:52:51 -0700 | [diff] [blame] | 366 | HP_SW_NAME); |
Chandra Seetharaman | 33af79d | 2008-07-16 17:35:08 -0700 | [diff] [blame] | 367 | return 0; |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 368 | } |
| 369 | |
Hannes Reinecke | 765cbc6 | 2008-07-17 16:52:51 -0700 | [diff] [blame] | 370 | scsi_dh_data->scsi_dh = &hp_sw_dh; |
Hannes Reinecke | 2aef6d5 | 2008-07-17 16:53:09 -0700 | [diff] [blame] | 371 | h = (struct hp_sw_dh_data *) scsi_dh_data->buf; |
| 372 | h->path_state = HP_SW_PATH_UNINITIALIZED; |
| 373 | h->retries = HP_SW_RETRIES; |
Chandra Seetharaman | 4e2ef86 | 2009-10-21 09:22:58 -0700 | [diff] [blame] | 374 | h->sdev = sdev; |
Hannes Reinecke | 2aef6d5 | 2008-07-17 16:53:09 -0700 | [diff] [blame] | 375 | |
| 376 | ret = hp_sw_tur(sdev, h); |
| 377 | if (ret != SCSI_DH_OK || h->path_state == HP_SW_PATH_UNINITIALIZED) |
| 378 | goto failed; |
| 379 | |
| 380 | if (!try_module_get(THIS_MODULE)) |
| 381 | goto failed; |
| 382 | |
Hannes Reinecke | 765cbc6 | 2008-07-17 16:52:51 -0700 | [diff] [blame] | 383 | spin_lock_irqsave(sdev->request_queue->queue_lock, flags); |
| 384 | sdev->scsi_dh_data = scsi_dh_data; |
| 385 | spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); |
Hannes Reinecke | 765cbc6 | 2008-07-17 16:52:51 -0700 | [diff] [blame] | 386 | |
Hannes Reinecke | 2aef6d5 | 2008-07-17 16:53:09 -0700 | [diff] [blame] | 387 | sdev_printk(KERN_INFO, sdev, "%s: attached to %s path\n", |
| 388 | HP_SW_NAME, h->path_state == HP_SW_PATH_ACTIVE? |
| 389 | "active":"passive"); |
Hannes Reinecke | 765cbc6 | 2008-07-17 16:52:51 -0700 | [diff] [blame] | 390 | |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 391 | return 0; |
Hannes Reinecke | 2aef6d5 | 2008-07-17 16:53:09 -0700 | [diff] [blame] | 392 | |
| 393 | failed: |
| 394 | kfree(scsi_dh_data); |
| 395 | sdev_printk(KERN_ERR, sdev, "%s: not attached\n", |
| 396 | HP_SW_NAME); |
| 397 | return -EINVAL; |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 398 | } |
| 399 | |
Hannes Reinecke | 765cbc6 | 2008-07-17 16:52:51 -0700 | [diff] [blame] | 400 | static void hp_sw_bus_detach( struct scsi_device *sdev ) |
| 401 | { |
| 402 | struct scsi_dh_data *scsi_dh_data; |
| 403 | unsigned long flags; |
| 404 | |
| 405 | spin_lock_irqsave(sdev->request_queue->queue_lock, flags); |
| 406 | scsi_dh_data = sdev->scsi_dh_data; |
| 407 | sdev->scsi_dh_data = NULL; |
| 408 | spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); |
| 409 | module_put(THIS_MODULE); |
| 410 | |
Hannes Reinecke | 2aef6d5 | 2008-07-17 16:53:09 -0700 | [diff] [blame] | 411 | sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", HP_SW_NAME); |
Hannes Reinecke | 765cbc6 | 2008-07-17 16:52:51 -0700 | [diff] [blame] | 412 | |
| 413 | kfree(scsi_dh_data); |
| 414 | } |
| 415 | |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 416 | static int __init hp_sw_init(void) |
| 417 | { |
| 418 | return scsi_register_device_handler(&hp_sw_dh); |
| 419 | } |
| 420 | |
| 421 | static void __exit hp_sw_exit(void) |
| 422 | { |
| 423 | scsi_unregister_device_handler(&hp_sw_dh); |
| 424 | } |
| 425 | |
| 426 | module_init(hp_sw_init); |
| 427 | module_exit(hp_sw_exit); |
| 428 | |
Hannes Reinecke | 2aef6d5 | 2008-07-17 16:53:09 -0700 | [diff] [blame] | 429 | MODULE_DESCRIPTION("HP Active/Passive driver"); |
Mike Christie | f6dd337 | 2008-05-01 14:49:59 -0700 | [diff] [blame] | 430 | MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu"); |
| 431 | MODULE_LICENSE("GPL"); |