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 49 static 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 58 static 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 66 static const char * lun_state[] = 67 { 68 "not bound", 69 "bound", 70 "owned", 71 }; 72 73 struct 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 }; 114 115 static 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 */ 126 static 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 } 166 167 static 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]; 209 210 out: 211 return err; 212 } 213 214 #define emc_default_str "FC (Legacy)" 215 216 static 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'; 257 258 out: 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 */ 269 static 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 } 321 322 static 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 } 354 355 static 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 } 403 404 static 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 } 451 452 static 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 } 464 465 static 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); 500 out: 501 return err; 502 } 503 504 static int clariion_send_inquiry(struct scsi_device *sdev, 505 struct clariion_dh_data *csdev) 506 { 507 int err, retry = CLARIION_RETRIES; 508 509 retry: 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 } 533 534 static 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; 558 559 done: 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 */ 576 static 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); 621 622 done: 623 return result; 624 } 625 626 static const struct scsi_dh_devlist clariion_dev_list[] = { 627 {"DGC", "RAID"}, 628 {"DGC", "DISK"}, 629 {"DGC", "VRAID"}, 630 {NULL, NULL}, 631 }; 632 633 static int clariion_bus_attach(struct scsi_device *sdev); 634 static void clariion_bus_detach(struct scsi_device *sdev); 635 636 static 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 }; 647 648 static 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; 691 692 failed: 693 kfree(scsi_dh_data); 694 sdev_printk(KERN_ERR, sdev, "%s: not attached\n", 695 CLARIION_NAME); 696 return -EINVAL; 697 } 698 699 static 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 } 715 716 static 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 } 726 727 static void __exit clariion_exit(void) 728 { 729 scsi_unregister_device_handler(&clariion_dh); 730 } 731 732 module_init(clariion_init); 733 module_exit(clariion_exit); 734 735 MODULE_DESCRIPTION("EMC CX/AX/FC-family driver"); 736 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, Chandra Seetharaman <sekharan@us.ibm.com>"); 737 MODULE_LICENSE("GPL"); 738