| 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 | |
| 50 | static 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 | |
| 59 | static 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 | |
| 67 | static const char * lun_state[] = |
| 68 | { |
| 69 | "not bound", |
| 70 | "bound", |
| 71 | "owned", |
| 72 | }; |
| 73 | |
| 74 | struct 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 | */ |
| 119 | static 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 | |
| 160 | static 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 | |
| 203 | out: |
| 204 | return err; |
| 205 | } |
| 206 | |
| 207 | #define emc_default_str "FC (Legacy)" |
| 208 | |
| 209 | static char * parse_sp_model(struct scsi_device *sdev, unsigned char *buffer) |
| 210 | { |
| 211 | unsigned char len = buffer[4] + 5; |
| 212 | char *sp_model = NULL; |
| 213 | unsigned char sp_len, serial_len; |
| 214 | |
| 215 | if (len < 160) { |
| 216 | sdev_printk(KERN_WARNING, sdev, |
| 217 | "%s: Invalid information section length %d\n", |
| 218 | CLARIION_NAME, len); |
| 219 | /* Check for old FC arrays */ |
| 220 | if (!strncmp(buffer + 8, "DGC", 3)) { |
| 221 | /* Old FC array, not supporting extended information */ |
| 222 | sp_model = emc_default_str; |
| 223 | } |
| 224 | goto out; |
| 225 | } |
| 226 | |
| 227 | /* |
| 228 | * Parse extended information for SP model number |
| 229 | */ |
| 230 | serial_len = buffer[160]; |
| 231 | if (serial_len == 0 || serial_len + 161 > len) { |
| 232 | sdev_printk(KERN_WARNING, sdev, |
| 233 | "%s: Invalid array serial number length %d\n", |
| 234 | CLARIION_NAME, serial_len); |
| 235 | goto out; |
| 236 | } |
| 237 | sp_len = buffer[99]; |
| 238 | if (sp_len == 0 || serial_len + sp_len + 161 > len) { |
| 239 | sdev_printk(KERN_WARNING, sdev, |
| 240 | "%s: Invalid model number length %d\n", |
| 241 | CLARIION_NAME, sp_len); |
| 242 | goto out; |
| 243 | } |
| 244 | sp_model = &buffer[serial_len + 161]; |
| 245 | /* Strip whitespace at the end */ |
| 246 | while (sp_len > 1 && sp_model[sp_len - 1] == ' ') |
| 247 | sp_len--; |
| 248 | |
| 249 | sp_model[sp_len] = '\0'; |
| 250 | |
| 251 | out: |
| 252 | return sp_model; |
| 253 | } |
| 254 | |
| 255 | /* |
| 256 | * Get block request for REQ_BLOCK_PC command issued to path. Currently |
| 257 | * limited to MODE_SELECT (trespass) and INQUIRY (VPD page 0xC0) commands. |
| 258 | * |
| 259 | * Uses data and sense buffers in hardware handler context structure and |
| 260 | * assumes serial servicing of commands, both issuance and completion. |
| 261 | */ |
| 262 | static struct request *get_req(struct scsi_device *sdev, int cmd, |
| 263 | unsigned char *buffer) |
| 264 | { |
| 265 | struct request *rq; |
| 266 | int len = 0; |
| 267 | |
| 268 | rq = blk_get_request(sdev->request_queue, |
| 269 | (cmd != INQUIRY) ? WRITE : READ, GFP_NOIO); |
| 270 | if (IS_ERR(rq)) { |
| 271 | sdev_printk(KERN_INFO, sdev, "get_req: blk_get_request failed"); |
| 272 | return NULL; |
| 273 | } |
| 274 | |
| 275 | blk_rq_set_block_pc(rq); |
| 276 | rq->cmd_len = COMMAND_SIZE(cmd); |
| 277 | rq->cmd[0] = cmd; |
| 278 | |
| 279 | switch (cmd) { |
| 280 | case MODE_SELECT: |
| 281 | len = sizeof(short_trespass); |
| 282 | rq->cmd[1] = 0x10; |
| 283 | rq->cmd[4] = len; |
| 284 | break; |
| 285 | case MODE_SELECT_10: |
| 286 | len = sizeof(long_trespass); |
| 287 | rq->cmd[1] = 0x10; |
| 288 | rq->cmd[8] = len; |
| 289 | break; |
| 290 | case INQUIRY: |
| 291 | len = CLARIION_BUFFER_SIZE; |
| 292 | rq->cmd[4] = len; |
| 293 | memset(buffer, 0, len); |
| 294 | break; |
| 295 | default: |
| 296 | BUG_ON(1); |
| 297 | break; |
| 298 | } |
| 299 | |
| 300 | rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | |
| 301 | REQ_FAILFAST_DRIVER; |
| 302 | rq->timeout = CLARIION_TIMEOUT; |
| 303 | rq->retries = CLARIION_RETRIES; |
| 304 | |
| 305 | if (blk_rq_map_kern(rq->q, rq, buffer, len, GFP_NOIO)) { |
| 306 | blk_put_request(rq); |
| 307 | return NULL; |
| 308 | } |
| 309 | |
| 310 | return rq; |
| 311 | } |
| 312 | |
| 313 | static int send_inquiry_cmd(struct scsi_device *sdev, int page, |
| 314 | struct clariion_dh_data *csdev) |
| 315 | { |
| 316 | struct request *rq = get_req(sdev, INQUIRY, csdev->buffer); |
| 317 | int err; |
| 318 | |
| 319 | if (!rq) |
| 320 | return SCSI_DH_RES_TEMP_UNAVAIL; |
| 321 | |
| 322 | rq->sense = csdev->sense; |
| 323 | memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE); |
| 324 | rq->sense_len = csdev->senselen = 0; |
| 325 | |
| 326 | rq->cmd[0] = INQUIRY; |
| 327 | if (page != 0) { |
| 328 | rq->cmd[1] = 1; |
| 329 | rq->cmd[2] = page; |
| 330 | } |
| 331 | err = blk_execute_rq(sdev->request_queue, NULL, rq, 1); |
| 332 | if (err == -EIO) { |
| 333 | sdev_printk(KERN_INFO, sdev, |
| 334 | "%s: failed to send %s INQUIRY: %x\n", |
| 335 | CLARIION_NAME, page?"EVPD":"standard", |
| 336 | rq->errors); |
| 337 | csdev->senselen = rq->sense_len; |
| 338 | err = SCSI_DH_IO; |
| 339 | } |
| 340 | |
| 341 | blk_put_request(rq); |
| 342 | |
| 343 | return err; |
| 344 | } |
| 345 | |
| 346 | static int send_trespass_cmd(struct scsi_device *sdev, |
| 347 | struct clariion_dh_data *csdev) |
| 348 | { |
| 349 | struct request *rq; |
| 350 | unsigned char *page22; |
| 351 | int err, len, cmd; |
| 352 | |
| 353 | if (csdev->flags & CLARIION_SHORT_TRESPASS) { |
| 354 | page22 = short_trespass; |
| 355 | if (!(csdev->flags & CLARIION_HONOR_RESERVATIONS)) |
| 356 | /* Set Honor Reservations bit */ |
| 357 | page22[6] |= 0x80; |
| 358 | len = sizeof(short_trespass); |
| 359 | cmd = MODE_SELECT; |
| 360 | } else { |
| 361 | page22 = long_trespass; |
| 362 | if (!(csdev->flags & CLARIION_HONOR_RESERVATIONS)) |
| 363 | /* Set Honor Reservations bit */ |
| 364 | page22[10] |= 0x80; |
| 365 | len = sizeof(long_trespass); |
| 366 | cmd = MODE_SELECT_10; |
| 367 | } |
| 368 | BUG_ON((len > CLARIION_BUFFER_SIZE)); |
| 369 | memcpy(csdev->buffer, page22, len); |
| 370 | |
| 371 | rq = get_req(sdev, cmd, csdev->buffer); |
| 372 | if (!rq) |
| 373 | return SCSI_DH_RES_TEMP_UNAVAIL; |
| 374 | |
| 375 | rq->sense = csdev->sense; |
| 376 | memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE); |
| 377 | rq->sense_len = csdev->senselen = 0; |
| 378 | |
| 379 | err = blk_execute_rq(sdev->request_queue, NULL, rq, 1); |
| 380 | if (err == -EIO) { |
| 381 | if (rq->sense_len) { |
| 382 | err = trespass_endio(sdev, csdev->sense); |
| 383 | } else { |
| 384 | sdev_printk(KERN_INFO, sdev, |
| 385 | "%s: failed to send MODE SELECT: %x\n", |
| 386 | CLARIION_NAME, rq->errors); |
| 387 | } |
| 388 | } |
| 389 | |
| 390 | blk_put_request(rq); |
| 391 | |
| 392 | return err; |
| 393 | } |
| 394 | |
| 395 | static int clariion_check_sense(struct scsi_device *sdev, |
| 396 | struct scsi_sense_hdr *sense_hdr) |
| 397 | { |
| 398 | switch (sense_hdr->sense_key) { |
| 399 | case NOT_READY: |
| 400 | if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x03) |
| 401 | /* |
| 402 | * LUN Not Ready - Manual Intervention Required |
| 403 | * indicates this is a passive path. |
| 404 | * |
| 405 | * FIXME: However, if this is seen and EVPD C0 |
| 406 | * indicates that this is due to a NDU in |
| 407 | * progress, we should set FAIL_PATH too. |
| 408 | * This indicates we might have to do a SCSI |
| 409 | * inquiry in the end_io path. Ugh. |
| 410 | * |
| 411 | * Can return FAILED only when we want the error |
| 412 | * recovery process to kick in. |
| 413 | */ |
| 414 | return SUCCESS; |
| 415 | break; |
| 416 | case ILLEGAL_REQUEST: |
| 417 | if (sense_hdr->asc == 0x25 && sense_hdr->ascq == 0x01) |
| 418 | /* |
| 419 | * An array based copy is in progress. Do not |
| 420 | * fail the path, do not bypass to another PG, |
| 421 | * do not retry. Fail the IO immediately. |
| 422 | * (Actually this is the same conclusion as in |
| 423 | * the default handler, but lets make sure.) |
| 424 | * |
| 425 | * Can return FAILED only when we want the error |
| 426 | * recovery process to kick in. |
| 427 | */ |
| 428 | return SUCCESS; |
| 429 | break; |
| 430 | case UNIT_ATTENTION: |
| 431 | if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00) |
| 432 | /* |
| 433 | * Unit Attention Code. This is the first IO |
| 434 | * to the new path, so just retry. |
| 435 | */ |
| 436 | return ADD_TO_MLQUEUE; |
| 437 | break; |
| 438 | } |
| 439 | |
| 440 | return SCSI_RETURN_NOT_HANDLED; |
| 441 | } |
| 442 | |
| 443 | static int clariion_prep_fn(struct scsi_device *sdev, struct request *req) |
| 444 | { |
| 445 | struct clariion_dh_data *h = sdev->handler_data; |
| 446 | int ret = BLKPREP_OK; |
| 447 | |
| 448 | if (h->lun_state != CLARIION_LUN_OWNED) { |
| 449 | ret = BLKPREP_KILL; |
| 450 | req->cmd_flags |= REQ_QUIET; |
| 451 | } |
| 452 | return ret; |
| 453 | |
| 454 | } |
| 455 | |
| 456 | static int clariion_std_inquiry(struct scsi_device *sdev, |
| 457 | struct clariion_dh_data *csdev) |
| 458 | { |
| 459 | int err = SCSI_DH_OK; |
| 460 | char *sp_model; |
| 461 | |
| 462 | err = send_inquiry_cmd(sdev, 0, csdev); |
| 463 | if (err != SCSI_DH_OK && csdev->senselen) { |
| 464 | struct scsi_sense_hdr sshdr; |
| 465 | |
| 466 | if (scsi_normalize_sense(csdev->sense, SCSI_SENSE_BUFFERSIZE, |
| 467 | &sshdr)) { |
| 468 | sdev_printk(KERN_ERR, sdev, "%s: INQUIRY sense code " |
| 469 | "%02x/%02x/%02x\n", CLARIION_NAME, |
| 470 | sshdr.sense_key, sshdr.asc, sshdr.ascq); |
| 471 | } |
| 472 | err = SCSI_DH_IO; |
| 473 | goto out; |
| 474 | } |
| 475 | |
| 476 | sp_model = parse_sp_model(sdev, csdev->buffer); |
| 477 | if (!sp_model) { |
| 478 | err = SCSI_DH_DEV_UNSUPP; |
| 479 | goto out; |
| 480 | } |
| 481 | |
| 482 | /* |
| 483 | * FC Series arrays do not support long trespass |
| 484 | */ |
| 485 | if (!strlen(sp_model) || !strncmp(sp_model, "FC",2)) |
| 486 | csdev->flags |= CLARIION_SHORT_TRESPASS; |
| 487 | |
| 488 | sdev_printk(KERN_INFO, sdev, |
| 489 | "%s: detected Clariion %s, flags %x\n", |
| 490 | CLARIION_NAME, sp_model, csdev->flags); |
| 491 | out: |
| 492 | return err; |
| 493 | } |
| 494 | |
| 495 | static int clariion_send_inquiry(struct scsi_device *sdev, |
| 496 | struct clariion_dh_data *csdev) |
| 497 | { |
| 498 | int err, retry = CLARIION_RETRIES; |
| 499 | |
| 500 | retry: |
| 501 | err = send_inquiry_cmd(sdev, 0xC0, csdev); |
| 502 | if (err != SCSI_DH_OK && csdev->senselen) { |
| 503 | struct scsi_sense_hdr sshdr; |
| 504 | |
| 505 | err = scsi_normalize_sense(csdev->sense, SCSI_SENSE_BUFFERSIZE, |
| 506 | &sshdr); |
| 507 | if (!err) |
| 508 | return SCSI_DH_IO; |
| 509 | |
| 510 | err = clariion_check_sense(sdev, &sshdr); |
| 511 | if (retry > 0 && err == ADD_TO_MLQUEUE) { |
| 512 | retry--; |
| 513 | goto retry; |
| 514 | } |
| 515 | sdev_printk(KERN_ERR, sdev, "%s: INQUIRY sense code " |
| 516 | "%02x/%02x/%02x\n", CLARIION_NAME, |
| 517 | sshdr.sense_key, sshdr.asc, sshdr.ascq); |
| 518 | err = SCSI_DH_IO; |
| 519 | } else { |
| 520 | err = parse_sp_info_reply(sdev, csdev); |
| 521 | } |
| 522 | return err; |
| 523 | } |
| 524 | |
| 525 | static int clariion_activate(struct scsi_device *sdev, |
| 526 | activate_complete fn, void *data) |
| 527 | { |
| 528 | struct clariion_dh_data *csdev = sdev->handler_data; |
| 529 | int result; |
| 530 | |
| 531 | result = clariion_send_inquiry(sdev, csdev); |
| 532 | if (result != SCSI_DH_OK) |
| 533 | goto done; |
| 534 | |
| 535 | if (csdev->lun_state == CLARIION_LUN_OWNED) |
| 536 | goto done; |
| 537 | |
| 538 | result = send_trespass_cmd(sdev, csdev); |
| 539 | if (result != SCSI_DH_OK) |
| 540 | goto done; |
| 541 | sdev_printk(KERN_INFO, sdev,"%s: %s trespass command sent\n", |
| 542 | CLARIION_NAME, |
| 543 | csdev->flags&CLARIION_SHORT_TRESPASS?"short":"long" ); |
| 544 | |
| 545 | /* Update status */ |
| 546 | result = clariion_send_inquiry(sdev, csdev); |
| 547 | if (result != SCSI_DH_OK) |
| 548 | goto done; |
| 549 | |
| 550 | done: |
| 551 | sdev_printk(KERN_INFO, sdev, |
| 552 | "%s: at SP %c Port %d (%s, default SP %c)\n", |
| 553 | CLARIION_NAME, csdev->current_sp + 'A', |
| 554 | csdev->port, lun_state[csdev->lun_state], |
| 555 | csdev->default_sp + 'A'); |
| 556 | |
| 557 | if (fn) |
| 558 | fn(data, result); |
| 559 | return 0; |
| 560 | } |
| 561 | /* |
| 562 | * params - parameters in the following format |
| 563 | * "no_of_params\0param1\0param2\0param3\0...\0" |
| 564 | * for example, string for 2 parameters with value 10 and 21 |
| 565 | * is specified as "2\010\021\0". |
| 566 | */ |
| 567 | static int clariion_set_params(struct scsi_device *sdev, const char *params) |
| 568 | { |
| 569 | struct clariion_dh_data *csdev = sdev->handler_data; |
| 570 | unsigned int hr = 0, st = 0, argc; |
| 571 | const char *p = params; |
| 572 | int result = SCSI_DH_OK; |
| 573 | |
| 574 | if ((sscanf(params, "%u", &argc) != 1) || (argc != 2)) |
| 575 | return -EINVAL; |
| 576 | |
| 577 | while (*p++) |
| 578 | ; |
| 579 | if ((sscanf(p, "%u", &st) != 1) || (st > 1)) |
| 580 | return -EINVAL; |
| 581 | |
| 582 | while (*p++) |
| 583 | ; |
| 584 | if ((sscanf(p, "%u", &hr) != 1) || (hr > 1)) |
| 585 | return -EINVAL; |
| 586 | |
| 587 | if (st) |
| 588 | csdev->flags |= CLARIION_SHORT_TRESPASS; |
| 589 | else |
| 590 | csdev->flags &= ~CLARIION_SHORT_TRESPASS; |
| 591 | |
| 592 | if (hr) |
| 593 | csdev->flags |= CLARIION_HONOR_RESERVATIONS; |
| 594 | else |
| 595 | csdev->flags &= ~CLARIION_HONOR_RESERVATIONS; |
| 596 | |
| 597 | /* |
| 598 | * If this path is owned, we have to send a trespass command |
| 599 | * with the new parameters. If not, simply return. Next trespass |
| 600 | * command would use the parameters. |
| 601 | */ |
| 602 | if (csdev->lun_state != CLARIION_LUN_OWNED) |
| 603 | goto done; |
| 604 | |
| 605 | csdev->lun_state = CLARIION_LUN_UNINITIALIZED; |
| 606 | result = send_trespass_cmd(sdev, csdev); |
| 607 | if (result != SCSI_DH_OK) |
| 608 | goto done; |
| 609 | |
| 610 | /* Update status */ |
| 611 | result = clariion_send_inquiry(sdev, csdev); |
| 612 | |
| 613 | done: |
| 614 | return result; |
| 615 | } |
| 616 | |
| 617 | static int clariion_bus_attach(struct scsi_device *sdev) |
| 618 | { |
| 619 | struct clariion_dh_data *h; |
| 620 | int err; |
| 621 | |
| 622 | h = kzalloc(sizeof(*h) , GFP_KERNEL); |
| 623 | if (!h) |
| 624 | return -ENOMEM; |
| 625 | h->lun_state = CLARIION_LUN_UNINITIALIZED; |
| 626 | h->default_sp = CLARIION_UNBOUND_LU; |
| 627 | h->current_sp = CLARIION_UNBOUND_LU; |
| 628 | |
| 629 | err = clariion_std_inquiry(sdev, h); |
| 630 | if (err != SCSI_DH_OK) |
| 631 | goto failed; |
| 632 | |
| 633 | err = clariion_send_inquiry(sdev, h); |
| 634 | if (err != SCSI_DH_OK) |
| 635 | goto failed; |
| 636 | |
| 637 | sdev_printk(KERN_INFO, sdev, |
| 638 | "%s: connected to SP %c Port %d (%s, default SP %c)\n", |
| 639 | CLARIION_NAME, h->current_sp + 'A', |
| 640 | h->port, lun_state[h->lun_state], |
| 641 | h->default_sp + 'A'); |
| 642 | |
| 643 | sdev->handler_data = h; |
| 644 | return 0; |
| 645 | |
| 646 | failed: |
| 647 | kfree(h); |
| 648 | return -EINVAL; |
| 649 | } |
| 650 | |
| 651 | static void clariion_bus_detach(struct scsi_device *sdev) |
| 652 | { |
| 653 | kfree(sdev->handler_data); |
| 654 | sdev->handler_data = NULL; |
| 655 | } |
| 656 | |
| 657 | static struct scsi_device_handler clariion_dh = { |
| 658 | .name = CLARIION_NAME, |
| 659 | .module = THIS_MODULE, |
| 660 | .attach = clariion_bus_attach, |
| 661 | .detach = clariion_bus_detach, |
| 662 | .check_sense = clariion_check_sense, |
| 663 | .activate = clariion_activate, |
| 664 | .prep_fn = clariion_prep_fn, |
| 665 | .set_params = clariion_set_params, |
| 666 | }; |
| 667 | |
| 668 | static int __init clariion_init(void) |
| 669 | { |
| 670 | int r; |
| 671 | |
| 672 | r = scsi_register_device_handler(&clariion_dh); |
| 673 | if (r != 0) |
| 674 | printk(KERN_ERR "%s: Failed to register scsi device handler.", |
| 675 | CLARIION_NAME); |
| 676 | return r; |
| 677 | } |
| 678 | |
| 679 | static void __exit clariion_exit(void) |
| 680 | { |
| 681 | scsi_unregister_device_handler(&clariion_dh); |
| 682 | } |
| 683 | |
| 684 | module_init(clariion_init); |
| 685 | module_exit(clariion_exit); |
| 686 | |
| 687 | MODULE_DESCRIPTION("EMC CX/AX/FC-family driver"); |
| 688 | MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, Chandra Seetharaman <sekharan@us.ibm.com>"); |
| 689 | MODULE_LICENSE("GPL"); |