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