drivers/scsi/device_handler/scsi_dh_emc.c

   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 <scsi/scsi.h>
  24 #include <scsi/scsi_eh.h>
  25 #include <scsi/scsi_dh.h>
  26 #include <scsi/scsi_device.h>
  27
  28 #define CLARIION_NAME                   "emc"
  29
  30 #define CLARIION_TRESPASS_PAGE          0x22
  31 #define CLARIION_BUFFER_SIZE            0xFC
  32 #define CLARIION_TIMEOUT                (60 * HZ)
  33 #define CLARIION_RETRIES                3
  34 #define CLARIION_UNBOUND_LU             -1
  35 #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
  47
  48 static unsigned char long_trespass[] = {
  49         0, 0, 0, 0, 0, 0, 0, 0,
  50         CLARIION_TRESPASS_PAGE, /* Page code */
  51         0x09,                   /* Page length - 2 */
  52         0x01,                   /* Trespass code */
  53         0xff, 0xff,             /* Trespass target */
  54         0, 0, 0, 0, 0, 0        /* Reserved bytes / unknown */
  55 };
  56
  57 static unsigned char short_trespass[] = {
  58         0, 0, 0, 0,
  59         CLARIION_TRESPASS_PAGE, /* Page code */
  60         0x02,                   /* Page length - 2 */
  61         0x01,                   /* Trespass code */
  62         0xff,                   /* Trespass target */
  63 };
  64
  65 static const char * lun_state[] =
  66 {
  67     "not bound",
  68     "bound",
  69     "owned",
  70 };
  71
  72 struct clariion_dh_data {
  73         /*
  74          * Flags:
  75          *  CLARIION_SHORT_TRESPASS
  76          * Use short trespass command (FC-series) or the long version
  77          * (default for AX/CX CLARiiON arrays).
  78          *
  79          *  CLARIION_HONOR_RESERVATIONS
  80          * Whether or not (default) to honor SCSI reservations when
  81          * initiating a switch-over.
  82          */
  83         unsigned flags;
  84         /*
  85          * I/O buffer for both MODE_SELECT and INQUIRY commands.
  86          */
  87         unsigned char buffer[CLARIION_BUFFER_SIZE];
  88         /*
  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];
  93         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          */
 106         int default_sp;
 107         /*
 108          * which SP (A=0,B=1,UNBOUND=-1) is the active SP for this
 109          * path's mapped LUN
 110          */
 111         int current_sp;
 112 };
 113
 114 static 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  */
 125 static int trespass_endio(struct scsi_device *sdev, char *sense)
 126 {
 127         int err = SCSI_DH_IO;
 128         struct scsi_sense_hdr sshdr;
 129
 130         if (!scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)) {
 131                 sdev_printk(KERN_ERR, sdev, "%s: Found valid sense data 0x%2x, "
 132                             "0x%2x, 0x%2x while sending CLARiiON trespass "
 133                             "command.\n", CLARIION_NAME, sshdr.sense_key,
 134                             sshdr.asc, sshdr.ascq);
 135
 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                          */
 142                         sdev_printk(KERN_INFO, sdev, "%s: Array Based Copy in "
 143                                     "progress while sending CLARiiON trespass "
 144                                     "command.\n", CLARIION_NAME);
 145                         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                          */
 152                         sdev_printk(KERN_INFO, sdev, "%s: Detected in-progress "
 153                                     "ucode upgrade NDU operation while sending "
 154                                     "CLARiiON trespass command.\n", CLARIION_NAME);
 155                         err = SCSI_DH_DEV_TEMP_BUSY;
 156                 } else
 157                         err = SCSI_DH_DEV_FAILED;
 158         } else {
 159                 sdev_printk(KERN_INFO, sdev,
 160                             "%s: failed to send MODE SELECT, no sense available\n",
 161                             CLARIION_NAME);
 162         }
 163         return err;
 164 }
 165
 166 static int parse_sp_info_reply(struct scsi_device *sdev,
 167                                struct clariion_dh_data *csdev)
 168 {
 169         int err = SCSI_DH_OK;
 170
 171         /* 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         }
 179         if (csdev->buffer[4] > 2) {
 180                 /* 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;
 202         }
 203
 204         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
 209 out:
 210         return err;
 211 }
 212
 213 #define emc_default_str "FC (Legacy)"
 214
 215 static char * parse_sp_model(struct scsi_device *sdev, unsigned char *buffer)
 216 {
 217         unsigned char len = buffer[4] + 5;
 218         char *sp_model = NULL;
 219         unsigned char sp_len, serial_len;
 220
 221         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;
 229                 }
 230                 goto out;
 231         }
 232
 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
 257 out:
 258         return sp_model;
 259 }
 260
 261 /*
 262  * 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  */
 268 static struct request *get_req(struct scsi_device *sdev, int cmd,
 269                                 unsigned char *buffer)
 270 {
 271         struct request *rq;
 272         int len = 0;
 273
 274         rq = blk_get_request(sdev->request_queue,
 275                         (cmd == MODE_SELECT) ? WRITE : READ, GFP_NOIO);
 276         if (!rq) {
 277                 sdev_printk(KERN_INFO, sdev, "get_req: blk_get_request failed");
 278                 return NULL;
 279         }
 280
 281         rq->cmd_len = COMMAND_SIZE(cmd);
 282         rq->cmd[0] = cmd;
 283
 284         switch (cmd) {
 285         case MODE_SELECT:
 286                 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);
 292                 rq->cmd_flags |= REQ_RW;
 293                 rq->cmd[1] = 0x10;
 294                 break;
 295         case INQUIRY:
 296                 len = CLARIION_BUFFER_SIZE;
 297                 memset(buffer, 0, len);
 298                 break;
 299         default:
 300                 BUG_ON(1);
 301                 break;
 302         }
 303
 304         rq->cmd[4] = len;
 305         rq->cmd_type = REQ_TYPE_BLOCK_PC;
 306         rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
 307                          REQ_FAILFAST_DRIVER;
 308         rq->timeout = CLARIION_TIMEOUT;
 309         rq->retries = CLARIION_RETRIES;
 310
 311         if (blk_rq_map_kern(rq->q, rq, buffer, len, GFP_NOIO)) {
 312                 blk_put_request(rq);
 313                 return NULL;
 314         }
 315
 316         return rq;
 317 }
 318
 319 static int send_inquiry_cmd(struct scsi_device *sdev, int page,
 320                             struct clariion_dh_data *csdev)
 321 {
 322         struct request *rq = get_req(sdev, INQUIRY, csdev->buffer);
 323         int err;
 324
 325         if (!rq)
 326                 return SCSI_DH_RES_TEMP_UNAVAIL;
 327
 328         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;
 350 }
 351
 352 static int send_trespass_cmd(struct scsi_device *sdev,
 353                             struct clariion_dh_data *csdev)
 354 {
 355         struct request *rq;
 356         unsigned char *page22;
 357         int err, len, cmd;
 358
 359         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);
 376
 377         rq = get_req(sdev, cmd, csdev->buffer);
 378         if (!rq)
 379                 return SCSI_DH_RES_TEMP_UNAVAIL;
 380
 381         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;
 399 }
 400
 401 static 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                          */
 442                         return ADD_TO_MLQUEUE;
 443                 break;
 444         }
 445
 446         return SCSI_RETURN_NOT_HANDLED;
 447 }
 448
 449 static 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
 462 static 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);
 497 out:
 498         return err;
 499 }
 500
 501 static int clariion_send_inquiry(struct scsi_device *sdev,
 502                                  struct clariion_dh_data *csdev)
 503 {
 504         int err, retry = CLARIION_RETRIES;
 505
 506 retry:
 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);
 517                 if (retry > 0 && err == ADD_TO_MLQUEUE) {
 518                         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
 531 static 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
 555 done:
 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;
 563 }
 564 /*
 565  * params - parameters in the following format
 566  *      "no_of_params\0param1\0param2\0param3\0...\0"
 567  *      for example, string for 2 parameters with value 10 and 21
 568  *      is specified as "2\010\021\0".
 569  */
 570 static int clariion_set_params(struct scsi_device *sdev, const char *params)
 571 {
 572         struct clariion_dh_data *csdev = get_clariion_data(sdev);
 573         unsigned int hr = 0, st = 0, argc;
 574         const char *p = params;
 575         int result = SCSI_DH_OK;
 576
 577         if ((sscanf(params, "%u", &argc) != 1) || (argc != 2))
 578                 return -EINVAL;
 579
 580         while (*p++)
 581                 ;
 582         if ((sscanf(p, "%u", &st) != 1) || (st > 1))
 583                 return -EINVAL;
 584
 585         while (*p++)
 586                 ;
 587         if ((sscanf(p, "%u", &hr) != 1) || (hr > 1))
 588                 return -EINVAL;
 589
 590         if (st)
 591                 csdev->flags |= CLARIION_SHORT_TRESPASS;
 592         else
 593                 csdev->flags &= ~CLARIION_SHORT_TRESPASS;
 594
 595         if (hr)
 596                 csdev->flags |= CLARIION_HONOR_RESERVATIONS;
 597         else
 598                 csdev->flags &= ~CLARIION_HONOR_RESERVATIONS;
 599
 600         /*
 601          * If this path is owned, we have to send a trespass command
 602          * with the new parameters. If not, simply return. Next trespass
 603          * command would use the parameters.
 604          */
 605         if (csdev->lun_state != CLARIION_LUN_OWNED)
 606                 goto done;
 607
 608         csdev->lun_state = CLARIION_LUN_UNINITIALIZED;
 609         result = send_trespass_cmd(sdev, csdev);
 610         if (result != SCSI_DH_OK)
 611                 goto done;
 612
 613         /* Update status */
 614         result = clariion_send_inquiry(sdev, csdev);
 615
 616 done:
 617         return result;
 618 }
 619
 620 static const struct scsi_dh_devlist clariion_dev_list[] = {
 621         {"DGC", "RAID"},
 622         {"DGC", "DISK"},
 623         {"DGC", "VRAID"},
 624         {NULL, NULL},
 625 };
 626
 627 static int clariion_bus_attach(struct scsi_device *sdev);
 628 static void clariion_bus_detach(struct scsi_device *sdev);
 629
 630 static struct scsi_device_handler clariion_dh = {
 631         .name           = CLARIION_NAME,
 632         .module         = THIS_MODULE,
 633         .devlist        = clariion_dev_list,
 634         .attach         = clariion_bus_attach,
 635         .detach         = clariion_bus_detach,
 636         .check_sense    = clariion_check_sense,
 637         .activate       = clariion_activate,
 638         .prep_fn        = clariion_prep_fn,
 639         .set_params     = clariion_set_params,
 640 };
 641
 642 static int clariion_bus_attach(struct scsi_device *sdev)
 643 {
 644         struct scsi_dh_data *scsi_dh_data;
 645         struct clariion_dh_data *h;
 646         unsigned long flags;
 647         int err;
 648
 649         scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *)
 650                                + sizeof(*h) , GFP_KERNEL);
 651         if (!scsi_dh_data) {
 652                 sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n",
 653                             CLARIION_NAME);
 654                 return -ENOMEM;
 655         }
 656
 657         scsi_dh_data->scsi_dh = &clariion_dh;
 658         h = (struct clariion_dh_data *) scsi_dh_data->buf;
 659         h->lun_state = CLARIION_LUN_UNINITIALIZED;
 660         h->default_sp = CLARIION_UNBOUND_LU;
 661         h->current_sp = CLARIION_UNBOUND_LU;
 662
 663         err = clariion_std_inquiry(sdev, h);
 664         if (err != SCSI_DH_OK)
 665                 goto failed;
 666
 667         err = clariion_send_inquiry(sdev, h);
 668         if (err != SCSI_DH_OK)
 669                 goto failed;
 670
 671         if (!try_module_get(THIS_MODULE))
 672                 goto failed;
 673
 674         spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
 675         sdev->scsi_dh_data = scsi_dh_data;
 676         spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
 677
 678         sdev_printk(KERN_INFO, sdev,
 679                     "%s: connected to SP %c Port %d (%s, default SP %c)\n",
 680                     CLARIION_NAME, h->current_sp + 'A',
 681                     h->port, lun_state[h->lun_state],
 682                     h->default_sp + 'A');
 683
 684         return 0;
 685
 686 failed:
 687         kfree(scsi_dh_data);
 688         sdev_printk(KERN_ERR, sdev, "%s: not attached\n",
 689                     CLARIION_NAME);
 690         return -EINVAL;
 691 }
 692
 693 static void clariion_bus_detach(struct scsi_device *sdev)
 694 {
 695         struct scsi_dh_data *scsi_dh_data;
 696         unsigned long flags;
 697
 698         spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
 699         scsi_dh_data = sdev->scsi_dh_data;
 700         sdev->scsi_dh_data = NULL;
 701         spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
 702
 703         sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n",
 704                     CLARIION_NAME);
 705
 706         kfree(scsi_dh_data);
 707         module_put(THIS_MODULE);
 708 }
 709
 710 static int __init clariion_init(void)
 711 {
 712         int r;
 713
 714         r = scsi_register_device_handler(&clariion_dh);
 715         if (r != 0)
 716                 printk(KERN_ERR "%s: Failed to register scsi device handler.",
 717                         CLARIION_NAME);
 718         return r;
 719 }
 720
 721 static void __exit clariion_exit(void)
 722 {
 723         scsi_unregister_device_handler(&clariion_dh);
 724 }
 725
 726 module_init(clariion_init);
 727 module_exit(clariion_exit);
 728
 729 MODULE_DESCRIPTION("EMC CX/AX/FC-family driver");
 730 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, Chandra Seetharaman <sekharan@us.ibm.com>");
 731 MODULE_LICENSE("GPL");