drivers/scsi/qla4xxx/ql4_os.c

   1 /*
   2  * QLogic iSCSI HBA Driver
   3  * Copyright (c)  2003-2006 QLogic Corporation
   4  *
   5  * See LICENSE.qla4xxx for copyright and licensing details.
   6  */
   7 #include <linux/moduleparam.h>
   8 #include <linux/slab.h>
   9
  10 #include <scsi/scsi_tcq.h>
  11 #include <scsi/scsicam.h>
  12
  13 #include "ql4_def.h"
  14 #include "ql4_version.h"
  15 #include "ql4_glbl.h"
  16 #include "ql4_dbg.h"
  17 #include "ql4_inline.h"
  18
  19 /*
  20  * Driver version
  21  */
  22 static char qla4xxx_version_str[40];
  23
  24 /*
  25  * SRB allocation cache
  26  */
  27 static struct kmem_cache *srb_cachep;
  28
  29 /*
  30  * Module parameter information and variables
  31  */
  32 int ql4xdiscoverywait = 60;
  33 module_param(ql4xdiscoverywait, int, S_IRUGO | S_IRUSR);
  34 MODULE_PARM_DESC(ql4xdiscoverywait, "Discovery wait time");
  35 int ql4xdontresethba = 0;
  36 module_param(ql4xdontresethba, int, S_IRUGO | S_IRUSR);
  37 MODULE_PARM_DESC(ql4xdontresethba,
  38                  "Dont reset the HBA when the driver gets 0x8002 AEN "
  39                  " default it will reset hba :0"
  40                  " set to 1 to avoid resetting HBA");
  41
  42 int ql4xextended_error_logging = 0; /* 0 = off, 1 = log errors */
  43 module_param(ql4xextended_error_logging, int, S_IRUGO | S_IRUSR);
  44 MODULE_PARM_DESC(ql4xextended_error_logging,
  45                  "Option to enable extended error logging, "
  46                  "Default is 0 - no logging, 1 - debug logging");
  47
  48 int ql4_mod_unload = 0;
  49
  50 #define QL4_DEF_QDEPTH 32
  51
  52 /*
  53  * SCSI host template entry points
  54  */
  55 static void qla4xxx_config_dma_addressing(struct scsi_qla_host *ha);
  56
  57 /*
  58  * iSCSI template entry points
  59  */
  60 static int qla4xxx_tgt_dscvr(struct Scsi_Host *shost,
  61                              enum iscsi_tgt_dscvr type, uint32_t enable,
  62                              struct sockaddr *dst_addr);
  63 static int qla4xxx_conn_get_param(struct iscsi_cls_conn *conn,
  64                                   enum iscsi_param param, char *buf);
  65 static int qla4xxx_sess_get_param(struct iscsi_cls_session *sess,
  66                                   enum iscsi_param param, char *buf);
  67 static int qla4xxx_host_get_param(struct Scsi_Host *shost,
  68                                   enum iscsi_host_param param, char *buf);
  69 static void qla4xxx_recovery_timedout(struct iscsi_cls_session *session);
  70 static enum blk_eh_timer_return qla4xxx_eh_cmd_timed_out(struct scsi_cmnd *sc);
  71
  72 /*
  73  * SCSI host template entry points
  74  */
  75 static int qla4xxx_queuecommand(struct scsi_cmnd *cmd,
  76                                 void (*done) (struct scsi_cmnd *));
  77 static int qla4xxx_eh_abort(struct scsi_cmnd *cmd);
  78 static int qla4xxx_eh_device_reset(struct scsi_cmnd *cmd);
  79 static int qla4xxx_eh_target_reset(struct scsi_cmnd *cmd);
  80 static int qla4xxx_eh_host_reset(struct scsi_cmnd *cmd);
  81 static int qla4xxx_slave_alloc(struct scsi_device *device);
  82 static int qla4xxx_slave_configure(struct scsi_device *device);
  83 static void qla4xxx_slave_destroy(struct scsi_device *sdev);
  84 static void qla4xxx_scan_start(struct Scsi_Host *shost);
  85
  86 static struct scsi_host_template qla4xxx_driver_template = {
  87         .module                 = THIS_MODULE,
  88         .name                   = DRIVER_NAME,
  89         .proc_name              = DRIVER_NAME,
  90         .queuecommand           = qla4xxx_queuecommand,
  91
  92         .eh_abort_handler       = qla4xxx_eh_abort,
  93         .eh_device_reset_handler = qla4xxx_eh_device_reset,
  94         .eh_target_reset_handler = qla4xxx_eh_target_reset,
  95         .eh_host_reset_handler  = qla4xxx_eh_host_reset,
  96         .eh_timed_out           = qla4xxx_eh_cmd_timed_out,
  97
  98         .slave_configure        = qla4xxx_slave_configure,
  99         .slave_alloc            = qla4xxx_slave_alloc,
 100         .slave_destroy          = qla4xxx_slave_destroy,
 101
 102         .scan_finished          = iscsi_scan_finished,
 103         .scan_start             = qla4xxx_scan_start,
 104
 105         .this_id                = -1,
 106         .cmd_per_lun            = 3,
 107         .use_clustering         = ENABLE_CLUSTERING,
 108         .sg_tablesize           = SG_ALL,
 109
 110         .max_sectors            = 0xFFFF,
 111 };
 112
 113 static struct iscsi_transport qla4xxx_iscsi_transport = {
 114         .owner                  = THIS_MODULE,
 115         .name                   = DRIVER_NAME,
 116         .caps                   = CAP_FW_DB | CAP_SENDTARGETS_OFFLOAD |
 117                                   CAP_DATA_PATH_OFFLOAD,
 118         .param_mask             = ISCSI_CONN_PORT | ISCSI_CONN_ADDRESS |
 119                                   ISCSI_TARGET_NAME | ISCSI_TPGT,
 120         .host_param_mask        = ISCSI_HOST_HWADDRESS |
 121                                   ISCSI_HOST_IPADDRESS |
 122                                   ISCSI_HOST_INITIATOR_NAME,
 123         .tgt_dscvr              = qla4xxx_tgt_dscvr,
 124         .get_conn_param         = qla4xxx_conn_get_param,
 125         .get_session_param      = qla4xxx_sess_get_param,
 126         .get_host_param         = qla4xxx_host_get_param,
 127         .session_recovery_timedout = qla4xxx_recovery_timedout,
 128 };
 129
 130 static struct scsi_transport_template *qla4xxx_scsi_transport;
 131
 132 static enum blk_eh_timer_return qla4xxx_eh_cmd_timed_out(struct scsi_cmnd *sc)
 133 {
 134         struct iscsi_cls_session *session;
 135         struct ddb_entry *ddb_entry;
 136
 137         session = starget_to_session(scsi_target(sc->device));
 138         ddb_entry = session->dd_data;
 139
 140         /* if we are not logged in then the LLD is going to clean up the cmd */
 141         if (atomic_read(&ddb_entry->state) != DDB_STATE_ONLINE)
 142                 return BLK_EH_RESET_TIMER;
 143         else
 144                 return BLK_EH_NOT_HANDLED;
 145 }
 146
 147 static void qla4xxx_recovery_timedout(struct iscsi_cls_session *session)
 148 {
 149         struct ddb_entry *ddb_entry = session->dd_data;
 150         struct scsi_qla_host *ha = ddb_entry->ha;
 151
 152         if (atomic_read(&ddb_entry->state) != DDB_STATE_ONLINE) {
 153                 atomic_set(&ddb_entry->state, DDB_STATE_DEAD);
 154
 155                 DEBUG2(printk("scsi%ld: %s: index [%d] port down retry count "
 156                               "of (%d) secs exhausted, marking device DEAD.\n",
 157                               ha->host_no, __func__, ddb_entry->fw_ddb_index,
 158                               ha->port_down_retry_count));
 159
 160                 DEBUG2(printk("scsi%ld: %s: scheduling dpc routine - dpc "
 161                               "flags = 0x%lx\n",
 162                               ha->host_no, __func__, ha->dpc_flags));
 163                 queue_work(ha->dpc_thread, &ha->dpc_work);
 164         }
 165 }
 166
 167 static int qla4xxx_host_get_param(struct Scsi_Host *shost,
 168                                   enum iscsi_host_param param, char *buf)
 169 {
 170         struct scsi_qla_host *ha = to_qla_host(shost);
 171         int len;
 172
 173         switch (param) {
 174         case ISCSI_HOST_PARAM_HWADDRESS:
 175                 len = sysfs_format_mac(buf, ha->my_mac, MAC_ADDR_LEN);
 176                 break;
 177         case ISCSI_HOST_PARAM_IPADDRESS:
 178                 len = sprintf(buf, "%d.%d.%d.%d\n", ha->ip_address[0],
 179                               ha->ip_address[1], ha->ip_address[2],
 180                               ha->ip_address[3]);
 181                 break;
 182         case ISCSI_HOST_PARAM_INITIATOR_NAME:
 183                 len = sprintf(buf, "%s\n", ha->name_string);
 184                 break;
 185         default:
 186                 return -ENOSYS;
 187         }
 188
 189         return len;
 190 }
 191
 192 static int qla4xxx_sess_get_param(struct iscsi_cls_session *sess,
 193                                   enum iscsi_param param, char *buf)
 194 {
 195         struct ddb_entry *ddb_entry = sess->dd_data;
 196         int len;
 197
 198         switch (param) {
 199         case ISCSI_PARAM_TARGET_NAME:
 200                 len = snprintf(buf, PAGE_SIZE - 1, "%s\n",
 201                                ddb_entry->iscsi_name);
 202                 break;
 203         case ISCSI_PARAM_TPGT:
 204                 len = sprintf(buf, "%u\n", ddb_entry->tpgt);
 205                 break;
 206         default:
 207                 return -ENOSYS;
 208         }
 209
 210         return len;
 211 }
 212
 213 static int qla4xxx_conn_get_param(struct iscsi_cls_conn *conn,
 214                                   enum iscsi_param param, char *buf)
 215 {
 216         struct iscsi_cls_session *session;
 217         struct ddb_entry *ddb_entry;
 218         int len;
 219
 220         session = iscsi_dev_to_session(conn->dev.parent);
 221         ddb_entry = session->dd_data;
 222
 223         switch (param) {
 224         case ISCSI_PARAM_CONN_PORT:
 225                 len = sprintf(buf, "%hu\n", ddb_entry->port);
 226                 break;
 227         case ISCSI_PARAM_CONN_ADDRESS:
 228                 /* TODO: what are the ipv6 bits */
 229                 len = sprintf(buf, "%pI4\n", &ddb_entry->ip_addr);
 230                 break;
 231         default:
 232                 return -ENOSYS;
 233         }
 234
 235         return len;
 236 }
 237
 238 static int qla4xxx_tgt_dscvr(struct Scsi_Host *shost,
 239                              enum iscsi_tgt_dscvr type, uint32_t enable,
 240                              struct sockaddr *dst_addr)
 241 {
 242         struct scsi_qla_host *ha;
 243         struct sockaddr_in *addr;
 244         struct sockaddr_in6 *addr6;
 245         int ret = 0;
 246
 247         ha = (struct scsi_qla_host *) shost->hostdata;
 248
 249         switch (type) {
 250         case ISCSI_TGT_DSCVR_SEND_TARGETS:
 251                 if (dst_addr->sa_family == AF_INET) {
 252                         addr = (struct sockaddr_in *)dst_addr;
 253                         if (qla4xxx_send_tgts(ha, (char *)&addr->sin_addr,
 254                                               addr->sin_port) != QLA_SUCCESS)
 255                                 ret = -EIO;
 256                 } else if (dst_addr->sa_family == AF_INET6) {
 257                         /*
 258                          * TODO: fix qla4xxx_send_tgts
 259                          */
 260                         addr6 = (struct sockaddr_in6 *)dst_addr;
 261                         if (qla4xxx_send_tgts(ha, (char *)&addr6->sin6_addr,
 262                                               addr6->sin6_port) != QLA_SUCCESS)
 263                                 ret = -EIO;
 264                 } else
 265                         ret = -ENOSYS;
 266                 break;
 267         default:
 268                 ret = -ENOSYS;
 269         }
 270         return ret;
 271 }
 272
 273 void qla4xxx_destroy_sess(struct ddb_entry *ddb_entry)
 274 {
 275         if (!ddb_entry->sess)
 276                 return;
 277
 278         if (ddb_entry->conn) {
 279                 atomic_set(&ddb_entry->state, DDB_STATE_DEAD);
 280                 iscsi_remove_session(ddb_entry->sess);
 281         }
 282         iscsi_free_session(ddb_entry->sess);
 283 }
 284
 285 int qla4xxx_add_sess(struct ddb_entry *ddb_entry)
 286 {
 287         int err;
 288
 289         ddb_entry->sess->recovery_tmo = ddb_entry->ha->port_down_retry_count;
 290         err = iscsi_add_session(ddb_entry->sess, ddb_entry->fw_ddb_index);
 291         if (err) {
 292                 DEBUG2(printk(KERN_ERR "Could not add session.\n"));
 293                 return err;
 294         }
 295
 296         ddb_entry->conn = iscsi_create_conn(ddb_entry->sess, 0, 0);
 297         if (!ddb_entry->conn) {
 298                 iscsi_remove_session(ddb_entry->sess);
 299                 DEBUG2(printk(KERN_ERR "Could not add connection.\n"));
 300                 return -ENOMEM;
 301         }
 302
 303         /* finally ready to go */
 304         iscsi_unblock_session(ddb_entry->sess);
 305         return 0;
 306 }
 307
 308 struct ddb_entry *qla4xxx_alloc_sess(struct scsi_qla_host *ha)
 309 {
 310         struct ddb_entry *ddb_entry;
 311         struct iscsi_cls_session *sess;
 312
 313         sess = iscsi_alloc_session(ha->host, &qla4xxx_iscsi_transport,
 314                                    sizeof(struct ddb_entry));
 315         if (!sess)
 316                 return NULL;
 317
 318         ddb_entry = sess->dd_data;
 319         memset(ddb_entry, 0, sizeof(*ddb_entry));
 320         ddb_entry->ha = ha;
 321         ddb_entry->sess = sess;
 322         return ddb_entry;
 323 }
 324
 325 static void qla4xxx_scan_start(struct Scsi_Host *shost)
 326 {
 327         struct scsi_qla_host *ha = shost_priv(shost);
 328         struct ddb_entry *ddb_entry, *ddbtemp;
 329
 330         /* finish setup of sessions that were already setup in firmware */
 331         list_for_each_entry_safe(ddb_entry, ddbtemp, &ha->ddb_list, list) {
 332                 if (ddb_entry->fw_ddb_device_state == DDB_DS_SESSION_ACTIVE)
 333                         qla4xxx_add_sess(ddb_entry);
 334         }
 335 }
 336
 337 /*
 338  * Timer routines
 339  */
 340
 341 static void qla4xxx_start_timer(struct scsi_qla_host *ha, void *func,
 342                                 unsigned long interval)
 343 {
 344         DEBUG(printk("scsi: %s: Starting timer thread for adapter %d\n",
 345                      __func__, ha->host->host_no));
 346         init_timer(&ha->timer);
 347         ha->timer.expires = jiffies + interval * HZ;
 348         ha->timer.data = (unsigned long)ha;
 349         ha->timer.function = (void (*)(unsigned long))func;
 350         add_timer(&ha->timer);
 351         ha->timer_active = 1;
 352 }
 353
 354 static void qla4xxx_stop_timer(struct scsi_qla_host *ha)
 355 {
 356         del_timer_sync(&ha->timer);
 357         ha->timer_active = 0;
 358 }
 359
 360 /***
 361  * qla4xxx_mark_device_missing - mark a device as missing.
 362  * @ha: Pointer to host adapter structure.
 363  * @ddb_entry: Pointer to device database entry
 364  *
 365  * This routine marks a device missing and resets the relogin retry count.
 366  **/
 367 void qla4xxx_mark_device_missing(struct scsi_qla_host *ha,
 368                                  struct ddb_entry *ddb_entry)
 369 {
 370         atomic_set(&ddb_entry->state, DDB_STATE_MISSING);
 371         DEBUG3(printk("scsi%d:%d:%d: index [%d] marked MISSING\n",
 372                       ha->host_no, ddb_entry->bus, ddb_entry->target,
 373                       ddb_entry->fw_ddb_index));
 374         iscsi_block_session(ddb_entry->sess);
 375         iscsi_conn_error_event(ddb_entry->conn, ISCSI_ERR_CONN_FAILED);
 376 }
 377
 378 static struct srb* qla4xxx_get_new_srb(struct scsi_qla_host *ha,
 379                                        struct ddb_entry *ddb_entry,
 380                                        struct scsi_cmnd *cmd,
 381                                        void (*done)(struct scsi_cmnd *))
 382 {
 383         struct srb *srb;
 384
 385         srb = mempool_alloc(ha->srb_mempool, GFP_ATOMIC);
 386         if (!srb)
 387                 return srb;
 388
 389         kref_init(&srb->srb_ref);
 390         srb->ha = ha;
 391         srb->ddb = ddb_entry;
 392         srb->cmd = cmd;
 393         srb->flags = 0;
 394         CMD_SP(cmd) = (void *)srb;
 395         cmd->scsi_done = done;
 396
 397         return srb;
 398 }
 399
 400 static void qla4xxx_srb_free_dma(struct scsi_qla_host *ha, struct srb *srb)
 401 {
 402         struct scsi_cmnd *cmd = srb->cmd;
 403
 404         if (srb->flags & SRB_DMA_VALID) {
 405                 scsi_dma_unmap(cmd);
 406                 srb->flags &= ~SRB_DMA_VALID;
 407         }
 408         CMD_SP(cmd) = NULL;
 409 }
 410
 411 void qla4xxx_srb_compl(struct kref *ref)
 412 {
 413         struct srb *srb = container_of(ref, struct srb, srb_ref);
 414         struct scsi_cmnd *cmd = srb->cmd;
 415         struct scsi_qla_host *ha = srb->ha;
 416
 417         qla4xxx_srb_free_dma(ha, srb);
 418
 419         mempool_free(srb, ha->srb_mempool);
 420
 421         cmd->scsi_done(cmd);
 422 }
 423
 424 /**
 425  * qla4xxx_queuecommand - scsi layer issues scsi command to driver.
 426  * @cmd: Pointer to Linux's SCSI command structure
 427  * @done_fn: Function that the driver calls to notify the SCSI mid-layer
 428  *      that the command has been processed.
 429  *
 430  * Remarks:
 431  * This routine is invoked by Linux to send a SCSI command to the driver.
 432  * The mid-level driver tries to ensure that queuecommand never gets
 433  * invoked concurrently with itself or the interrupt handler (although
 434  * the interrupt handler may call this routine as part of request-
 435  * completion handling).   Unfortunely, it sometimes calls the scheduler
 436  * in interrupt context which is a big NO! NO!.
 437  **/
 438 static int qla4xxx_queuecommand(struct scsi_cmnd *cmd,
 439                                 void (*done)(struct scsi_cmnd *))
 440 {
 441         struct scsi_qla_host *ha = to_qla_host(cmd->device->host);
 442         struct ddb_entry *ddb_entry = cmd->device->hostdata;
 443         struct iscsi_cls_session *sess = ddb_entry->sess;
 444         struct srb *srb;
 445         int rval;
 446
 447         if (!sess) {
 448                 cmd->result = DID_IMM_RETRY << 16;
 449                 goto qc_fail_command;
 450         }
 451
 452         rval = iscsi_session_chkready(sess);
 453         if (rval) {
 454                 cmd->result = rval;
 455                 goto qc_fail_command;
 456         }
 457
 458         if (atomic_read(&ddb_entry->state) != DDB_STATE_ONLINE) {
 459                 if (atomic_read(&ddb_entry->state) == DDB_STATE_DEAD) {
 460                         cmd->result = DID_NO_CONNECT << 16;
 461                         goto qc_fail_command;
 462                 }
 463                 return SCSI_MLQUEUE_TARGET_BUSY;
 464         }
 465
 466         if (test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags))
 467                 goto qc_host_busy;
 468
 469         spin_unlock_irq(ha->host->host_lock);
 470
 471         srb = qla4xxx_get_new_srb(ha, ddb_entry, cmd, done);
 472         if (!srb)
 473                 goto qc_host_busy_lock;
 474
 475         rval = qla4xxx_send_command_to_isp(ha, srb);
 476         if (rval != QLA_SUCCESS)
 477                 goto qc_host_busy_free_sp;
 478
 479         spin_lock_irq(ha->host->host_lock);
 480         return 0;
 481
 482 qc_host_busy_free_sp:
 483         qla4xxx_srb_free_dma(ha, srb);
 484         mempool_free(srb, ha->srb_mempool);
 485
 486 qc_host_busy_lock:
 487         spin_lock_irq(ha->host->host_lock);
 488
 489 qc_host_busy:
 490         return SCSI_MLQUEUE_HOST_BUSY;
 491
 492 qc_fail_command:
 493         done(cmd);
 494
 495         return 0;
 496 }
 497
 498 /**
 499  * qla4xxx_mem_free - frees memory allocated to adapter
 500  * @ha: Pointer to host adapter structure.
 501  *
 502  * Frees memory previously allocated by qla4xxx_mem_alloc
 503  **/
 504 static void qla4xxx_mem_free(struct scsi_qla_host *ha)
 505 {
 506         if (ha->queues)
 507                 dma_free_coherent(&ha->pdev->dev, ha->queues_len, ha->queues,
 508                                   ha->queues_dma);
 509
 510         ha->queues_len = 0;
 511         ha->queues = NULL;
 512         ha->queues_dma = 0;
 513         ha->request_ring = NULL;
 514         ha->request_dma = 0;
 515         ha->response_ring = NULL;
 516         ha->response_dma = 0;
 517         ha->shadow_regs = NULL;
 518         ha->shadow_regs_dma = 0;
 519
 520         /* Free srb pool. */
 521         if (ha->srb_mempool)
 522                 mempool_destroy(ha->srb_mempool);
 523
 524         ha->srb_mempool = NULL;
 525
 526         /* release io space registers  */
 527         if (ha->reg)
 528                 iounmap(ha->reg);
 529         pci_release_regions(ha->pdev);
 530 }
 531
 532 /**
 533  * qla4xxx_mem_alloc - allocates memory for use by adapter.
 534  * @ha: Pointer to host adapter structure
 535  *
 536  * Allocates DMA memory for request and response queues. Also allocates memory
 537  * for srbs.
 538  **/
 539 static int qla4xxx_mem_alloc(struct scsi_qla_host *ha)
 540 {
 541         unsigned long align;
 542
 543         /* Allocate contiguous block of DMA memory for queues. */
 544         ha->queues_len = ((REQUEST_QUEUE_DEPTH * QUEUE_SIZE) +
 545                           (RESPONSE_QUEUE_DEPTH * QUEUE_SIZE) +
 546                           sizeof(struct shadow_regs) +
 547                           MEM_ALIGN_VALUE +
 548                           (PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1);
 549         ha->queues = dma_alloc_coherent(&ha->pdev->dev, ha->queues_len,
 550                                         &ha->queues_dma, GFP_KERNEL);
 551         if (ha->queues == NULL) {
 552                 dev_warn(&ha->pdev->dev,
 553                         "Memory Allocation failed - queues.\n");
 554
 555                 goto mem_alloc_error_exit;
 556         }
 557         memset(ha->queues, 0, ha->queues_len);
 558
 559         /*
 560          * As per RISC alignment requirements -- the bus-address must be a
 561          * multiple of the request-ring size (in bytes).
 562          */
 563         align = 0;
 564         if ((unsigned long)ha->queues_dma & (MEM_ALIGN_VALUE - 1))
 565                 align = MEM_ALIGN_VALUE - ((unsigned long)ha->queues_dma &
 566                                            (MEM_ALIGN_VALUE - 1));
 567
 568         /* Update request and response queue pointers. */
 569         ha->request_dma = ha->queues_dma + align;
 570         ha->request_ring = (struct queue_entry *) (ha->queues + align);
 571         ha->response_dma = ha->queues_dma + align +
 572                 (REQUEST_QUEUE_DEPTH * QUEUE_SIZE);
 573         ha->response_ring = (struct queue_entry *) (ha->queues + align +
 574                                                     (REQUEST_QUEUE_DEPTH *
 575                                                      QUEUE_SIZE));
 576         ha->shadow_regs_dma = ha->queues_dma + align +
 577                 (REQUEST_QUEUE_DEPTH * QUEUE_SIZE) +
 578                 (RESPONSE_QUEUE_DEPTH * QUEUE_SIZE);
 579         ha->shadow_regs = (struct shadow_regs *) (ha->queues + align +
 580                                                   (REQUEST_QUEUE_DEPTH *
 581                                                    QUEUE_SIZE) +
 582                                                   (RESPONSE_QUEUE_DEPTH *
 583                                                    QUEUE_SIZE));
 584
 585         /* Allocate memory for srb pool. */
 586         ha->srb_mempool = mempool_create(SRB_MIN_REQ, mempool_alloc_slab,
 587                                          mempool_free_slab, srb_cachep);
 588         if (ha->srb_mempool == NULL) {
 589                 dev_warn(&ha->pdev->dev,
 590                         "Memory Allocation failed - SRB Pool.\n");
 591
 592                 goto mem_alloc_error_exit;
 593         }
 594
 595         return QLA_SUCCESS;
 596
 597 mem_alloc_error_exit:
 598         qla4xxx_mem_free(ha);
 599         return QLA_ERROR;
 600 }
 601
 602 /**
 603  * qla4xxx_timer - checks every second for work to do.
 604  * @ha: Pointer to host adapter structure.
 605  **/
 606 static void qla4xxx_timer(struct scsi_qla_host *ha)
 607 {
 608         struct ddb_entry *ddb_entry, *dtemp;
 609         int start_dpc = 0;
 610
 611         /* Search for relogin's to time-out and port down retry. */
 612         list_for_each_entry_safe(ddb_entry, dtemp, &ha->ddb_list, list) {
 613                 /* Count down time between sending relogins */
 614                 if (adapter_up(ha) &&
 615                     !test_bit(DF_RELOGIN, &ddb_entry->flags) &&
 616                     atomic_read(&ddb_entry->state) != DDB_STATE_ONLINE) {
 617                         if (atomic_read(&ddb_entry->retry_relogin_timer) !=
 618                             INVALID_ENTRY) {
 619                                 if (atomic_read(&ddb_entry->retry_relogin_timer)
 620                                                 == 0) {
 621                                         atomic_set(&ddb_entry->
 622                                                 retry_relogin_timer,
 623                                                 INVALID_ENTRY);
 624                                         set_bit(DPC_RELOGIN_DEVICE,
 625                                                 &ha->dpc_flags);
 626                                         set_bit(DF_RELOGIN, &ddb_entry->flags);
 627                                         DEBUG2(printk("scsi%ld: %s: index [%d]"
 628                                                       " login device\n",
 629                                                       ha->host_no, __func__,
 630                                                       ddb_entry->fw_ddb_index));
 631                                 } else
 632                                         atomic_dec(&ddb_entry->
 633                                                         retry_relogin_timer);
 634                         }
 635                 }
 636
 637                 /* Wait for relogin to timeout */
 638                 if (atomic_read(&ddb_entry->relogin_timer) &&
 639                     (atomic_dec_and_test(&ddb_entry->relogin_timer) != 0)) {
 640                         /*
 641                          * If the relogin times out and the device is
 642                          * still NOT ONLINE then try and relogin again.
 643                          */
 644                         if (atomic_read(&ddb_entry->state) !=
 645                             DDB_STATE_ONLINE &&
 646                             ddb_entry->fw_ddb_device_state ==
 647                             DDB_DS_SESSION_FAILED) {
 648                                 /* Reset retry relogin timer */
 649                                 atomic_inc(&ddb_entry->relogin_retry_count);
 650                                 DEBUG2(printk("scsi%ld: index[%d] relogin"
 651                                               " timed out-retrying"
 652                                               " relogin (%d)\n",
 653                                               ha->host_no,
 654                                               ddb_entry->fw_ddb_index,
 655                                               atomic_read(&ddb_entry->
 656                                                           relogin_retry_count))
 657                                         );
 658                                 start_dpc++;
 659                                 DEBUG(printk("scsi%ld:%d:%d: index [%d] "
 660                                              "initate relogin after"
 661                                              " %d seconds\n",
 662                                              ha->host_no, ddb_entry->bus,
 663                                              ddb_entry->target,
 664                                              ddb_entry->fw_ddb_index,
 665                                              ddb_entry->default_time2wait + 4)
 666                                         );
 667
 668                                 atomic_set(&ddb_entry->retry_relogin_timer,
 669                                            ddb_entry->default_time2wait + 4);
 670                         }
 671                 }
 672         }
 673
 674         /* Check for heartbeat interval. */
 675         if (ha->firmware_options & FWOPT_HEARTBEAT_ENABLE &&
 676             ha->heartbeat_interval != 0) {
 677                 ha->seconds_since_last_heartbeat++;
 678                 if (ha->seconds_since_last_heartbeat >
 679                     ha->heartbeat_interval + 2)
 680                         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 681         }
 682
 683
 684         /* Wakeup the dpc routine for this adapter, if needed. */
 685         if ((start_dpc ||
 686              test_bit(DPC_RESET_HA, &ha->dpc_flags) ||
 687              test_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags) ||
 688              test_bit(DPC_RELOGIN_DEVICE, &ha->dpc_flags) ||
 689              test_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags) ||
 690              test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags) ||
 691              test_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags) ||
 692              test_bit(DPC_LINK_CHANGED, &ha->dpc_flags) ||
 693              test_bit(DPC_AEN, &ha->dpc_flags)) &&
 694              ha->dpc_thread) {
 695                 DEBUG2(printk("scsi%ld: %s: scheduling dpc routine"
 696                               " - dpc flags = 0x%lx\n",
 697                               ha->host_no, __func__, ha->dpc_flags));
 698                 queue_work(ha->dpc_thread, &ha->dpc_work);
 699         }
 700
 701         /* Reschedule timer thread to call us back in one second */
 702         mod_timer(&ha->timer, jiffies + HZ);
 703
 704         DEBUG2(ha->seconds_since_last_intr++);
 705 }
 706
 707 /**
 708  * qla4xxx_cmd_wait - waits for all outstanding commands to complete
 709  * @ha: Pointer to host adapter structure.
 710  *
 711  * This routine stalls the driver until all outstanding commands are returned.
 712  * Caller must release the Hardware Lock prior to calling this routine.
 713  **/
 714 static int qla4xxx_cmd_wait(struct scsi_qla_host *ha)
 715 {
 716         uint32_t index = 0;
 717         int stat = QLA_SUCCESS;
 718         unsigned long flags;
 719         struct scsi_cmnd *cmd;
 720         int wait_cnt = WAIT_CMD_TOV;    /*
 721                                          * Initialized for 30 seconds as we
 722                                          * expect all commands to retuned
 723                                          * ASAP.
 724                                          */
 725
 726         while (wait_cnt) {
 727                 spin_lock_irqsave(&ha->hardware_lock, flags);
 728                 /* Find a command that hasn't completed. */
 729                 for (index = 0; index < ha->host->can_queue; index++) {
 730                         cmd = scsi_host_find_tag(ha->host, index);
 731                         if (cmd != NULL)
 732                                 break;
 733                 }
 734                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 735
 736                 /* If No Commands are pending, wait is complete */
 737                 if (index == ha->host->can_queue) {
 738                         break;
 739                 }
 740
 741                 /* If we timed out on waiting for commands to come back
 742                  * return ERROR.
 743                  */
 744                 wait_cnt--;
 745                 if (wait_cnt == 0)
 746                         stat = QLA_ERROR;
 747                 else {
 748                         msleep(1000);
 749                 }
 750         }                       /* End of While (wait_cnt) */
 751
 752         return stat;
 753 }
 754
 755 void qla4xxx_hw_reset(struct scsi_qla_host *ha)
 756 {
 757         uint32_t ctrl_status;
 758         unsigned long flags = 0;
 759
 760         DEBUG2(printk(KERN_ERR "scsi%ld: %s\n", ha->host_no, __func__));
 761
 762         spin_lock_irqsave(&ha->hardware_lock, flags);
 763
 764         /*
 765          * If the SCSI Reset Interrupt bit is set, clear it.
 766          * Otherwise, the Soft Reset won't work.
 767          */
 768         ctrl_status = readw(&ha->reg->ctrl_status);
 769         if ((ctrl_status & CSR_SCSI_RESET_INTR) != 0)
 770                 writel(set_rmask(CSR_SCSI_RESET_INTR), &ha->reg->ctrl_status);
 771
 772         /* Issue Soft Reset */
 773         writel(set_rmask(CSR_SOFT_RESET), &ha->reg->ctrl_status);
 774         readl(&ha->reg->ctrl_status);
 775
 776         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 777 }
 778
 779 /**
 780  * qla4xxx_soft_reset - performs soft reset.
 781  * @ha: Pointer to host adapter structure.
 782  **/
 783 int qla4xxx_soft_reset(struct scsi_qla_host *ha)
 784 {
 785         uint32_t max_wait_time;
 786         unsigned long flags = 0;
 787         int status = QLA_ERROR;
 788         uint32_t ctrl_status;
 789
 790         qla4xxx_hw_reset(ha);
 791
 792         /* Wait until the Network Reset Intr bit is cleared */
 793         max_wait_time = RESET_INTR_TOV;
 794         do {
 795                 spin_lock_irqsave(&ha->hardware_lock, flags);
 796                 ctrl_status = readw(&ha->reg->ctrl_status);
 797                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 798
 799                 if ((ctrl_status & CSR_NET_RESET_INTR) == 0)
 800                         break;
 801
 802                 msleep(1000);
 803         } while ((--max_wait_time));
 804
 805         if ((ctrl_status & CSR_NET_RESET_INTR) != 0) {
 806                 DEBUG2(printk(KERN_WARNING
 807                               "scsi%ld: Network Reset Intr not cleared by "
 808                               "Network function, clearing it now!\n",
 809                               ha->host_no));
 810                 spin_lock_irqsave(&ha->hardware_lock, flags);
 811                 writel(set_rmask(CSR_NET_RESET_INTR), &ha->reg->ctrl_status);
 812                 readl(&ha->reg->ctrl_status);
 813                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 814         }
 815
 816         /* Wait until the firmware tells us the Soft Reset is done */
 817         max_wait_time = SOFT_RESET_TOV;
 818         do {
 819                 spin_lock_irqsave(&ha->hardware_lock, flags);
 820                 ctrl_status = readw(&ha->reg->ctrl_status);
 821                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 822
 823                 if ((ctrl_status & CSR_SOFT_RESET) == 0) {
 824                         status = QLA_SUCCESS;
 825                         break;
 826                 }
 827
 828                 msleep(1000);
 829         } while ((--max_wait_time));
 830
 831         /*
 832          * Also, make sure that the SCSI Reset Interrupt bit has been cleared
 833          * after the soft reset has taken place.
 834          */
 835         spin_lock_irqsave(&ha->hardware_lock, flags);
 836         ctrl_status = readw(&ha->reg->ctrl_status);
 837         if ((ctrl_status & CSR_SCSI_RESET_INTR) != 0) {
 838                 writel(set_rmask(CSR_SCSI_RESET_INTR), &ha->reg->ctrl_status);
 839                 readl(&ha->reg->ctrl_status);
 840         }
 841         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 842
 843         /* If soft reset fails then most probably the bios on other
 844          * function is also enabled.
 845          * Since the initialization is sequential the other fn
 846          * wont be able to acknowledge the soft reset.
 847          * Issue a force soft reset to workaround this scenario.
 848          */
 849         if (max_wait_time == 0) {
 850                 /* Issue Force Soft Reset */
 851                 spin_lock_irqsave(&ha->hardware_lock, flags);
 852                 writel(set_rmask(CSR_FORCE_SOFT_RESET), &ha->reg->ctrl_status);
 853                 readl(&ha->reg->ctrl_status);
 854                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 855                 /* Wait until the firmware tells us the Soft Reset is done */
 856                 max_wait_time = SOFT_RESET_TOV;
 857                 do {
 858                         spin_lock_irqsave(&ha->hardware_lock, flags);
 859                         ctrl_status = readw(&ha->reg->ctrl_status);
 860                         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 861
 862                         if ((ctrl_status & CSR_FORCE_SOFT_RESET) == 0) {
 863                                 status = QLA_SUCCESS;
 864                                 break;
 865                         }
 866
 867                         msleep(1000);
 868                 } while ((--max_wait_time));
 869         }
 870
 871         return status;
 872 }
 873
 874 /**
 875  * qla4xxx_flush_active_srbs - returns all outstanding i/o requests to O.S.
 876  * @ha: Pointer to host adapter structure.
 877  *
 878  * This routine is called just prior to a HARD RESET to return all
 879  * outstanding commands back to the Operating System.
 880  * Caller should make sure that the following locks are released
 881  * before this calling routine: Hardware lock, and io_request_lock.
 882  **/
 883 static void qla4xxx_flush_active_srbs(struct scsi_qla_host *ha)
 884 {
 885         struct srb *srb;
 886         int i;
 887         unsigned long flags;
 888
 889         spin_lock_irqsave(&ha->hardware_lock, flags);
 890         for (i = 0; i < ha->host->can_queue; i++) {
 891                 srb = qla4xxx_del_from_active_array(ha, i);
 892                 if (srb != NULL) {
 893                         srb->cmd->result = DID_RESET << 16;
 894                         kref_put(&srb->srb_ref, qla4xxx_srb_compl);
 895                 }
 896         }
 897         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 898 }
 899
 900 /**
 901  * qla4xxx_recover_adapter - recovers adapter after a fatal error
 902  * @ha: Pointer to host adapter structure.
 903  * @renew_ddb_list: Indicates what to do with the adapter's ddb list
 904  *
 905  * renew_ddb_list value can be 0=preserve ddb list, 1=destroy and rebuild
 906  * ddb list.
 907  **/
 908 static int qla4xxx_recover_adapter(struct scsi_qla_host *ha,
 909                                 uint8_t renew_ddb_list)
 910 {
 911         int status;
 912
 913         /* Stall incoming I/O until we are done */
 914         clear_bit(AF_ONLINE, &ha->flags);
 915
 916         DEBUG2(printk("scsi%ld: %s calling qla4xxx_cmd_wait\n", ha->host_no,
 917                       __func__));
 918
 919         /* Wait for outstanding commands to complete.
 920          * Stalls the driver for max 30 secs
 921          */
 922         status = qla4xxx_cmd_wait(ha);
 923
 924         qla4xxx_disable_intrs(ha);
 925
 926         /* Flush any pending ddb changed AENs */
 927         qla4xxx_process_aen(ha, FLUSH_DDB_CHANGED_AENS);
 928
 929         qla4xxx_flush_active_srbs(ha);
 930
 931         /* Reset the firmware.  If successful, function
 932          * returns with ISP interrupts enabled.
 933          */
 934         DEBUG2(printk("scsi%ld: %s - Performing soft reset..\n",
 935                       ha->host_no, __func__));
 936         if (ql4xxx_lock_drvr_wait(ha) == QLA_SUCCESS)
 937                 status = qla4xxx_soft_reset(ha);
 938         else
 939                 status = QLA_ERROR;
 940
 941         /* Flush any pending ddb changed AENs */
 942         qla4xxx_process_aen(ha, FLUSH_DDB_CHANGED_AENS);
 943
 944         /* Re-initialize firmware. If successful, function returns
 945          * with ISP interrupts enabled */
 946         if (status == QLA_SUCCESS) {
 947                 DEBUG2(printk("scsi%ld: %s - Initializing adapter..\n",
 948                               ha->host_no, __func__));
 949
 950                 /* If successful, AF_ONLINE flag set in
 951                  * qla4xxx_initialize_adapter */
 952                 status = qla4xxx_initialize_adapter(ha, renew_ddb_list);
 953         }
 954
 955         /* Failed adapter initialization?
 956          * Retry reset_ha only if invoked via DPC (DPC_RESET_HA) */
 957         if ((test_bit(AF_ONLINE, &ha->flags) == 0) &&
 958             (test_bit(DPC_RESET_HA, &ha->dpc_flags))) {
 959                 /* Adapter initialization failed, see if we can retry
 960                  * resetting the ha */
 961                 if (!test_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags)) {
 962                         ha->retry_reset_ha_cnt = MAX_RESET_HA_RETRIES;
 963                         DEBUG2(printk("scsi%ld: recover adapter - retrying "
 964                                       "(%d) more times\n", ha->host_no,
 965                                       ha->retry_reset_ha_cnt));
 966                         set_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags);
 967                         status = QLA_ERROR;
 968                 } else {
 969                         if (ha->retry_reset_ha_cnt > 0) {
 970                                 /* Schedule another Reset HA--DPC will retry */
 971                                 ha->retry_reset_ha_cnt--;
 972                                 DEBUG2(printk("scsi%ld: recover adapter - "
 973                                               "retry remaining %d\n",
 974                                               ha->host_no,
 975                                               ha->retry_reset_ha_cnt));
 976                                 status = QLA_ERROR;
 977                         }
 978
 979                         if (ha->retry_reset_ha_cnt == 0) {
 980                                 /* Recover adapter retries have been exhausted.
 981                                  * Adapter DEAD */
 982                                 DEBUG2(printk("scsi%ld: recover adapter "
 983                                               "failed - board disabled\n",
 984                                               ha->host_no));
 985                                 qla4xxx_flush_active_srbs(ha);
 986                                 clear_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags);
 987                                 clear_bit(DPC_RESET_HA, &ha->dpc_flags);
 988                                 clear_bit(DPC_RESET_HA_DESTROY_DDB_LIST,
 989                                           &ha->dpc_flags);
 990                                 status = QLA_ERROR;
 991                         }
 992                 }
 993         } else {
 994                 clear_bit(DPC_RESET_HA, &ha->dpc_flags);
 995                 clear_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags);
 996                 clear_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags);
 997         }
 998
 999         ha->adapter_error_count++;
1000
1001         if (status == QLA_SUCCESS)
1002                 qla4xxx_enable_intrs(ha);
1003
1004         DEBUG2(printk("scsi%ld: recover adapter .. DONE\n", ha->host_no));
1005         return status;
1006 }
1007
1008 /**
1009  * qla4xxx_do_dpc - dpc routine
1010  * @data: in our case pointer to adapter structure
1011  *
1012  * This routine is a task that is schedule by the interrupt handler
1013  * to perform the background processing for interrupts.  We put it
1014  * on a task queue that is consumed whenever the scheduler runs; that's
1015  * so you can do anything (i.e. put the process to sleep etc).  In fact,
1016  * the mid-level tries to sleep when it reaches the driver threshold
1017  * "host->can_queue". This can cause a panic if we were in our interrupt code.
1018  **/
1019 static void qla4xxx_do_dpc(struct work_struct *work)
1020 {
1021         struct scsi_qla_host *ha =
1022                 container_of(work, struct scsi_qla_host, dpc_work);
1023         struct ddb_entry *ddb_entry, *dtemp;
1024         int status = QLA_ERROR;
1025
1026         DEBUG2(printk("scsi%ld: %s: DPC handler waking up."
1027                 "flags = 0x%08lx, dpc_flags = 0x%08lx ctrl_stat = 0x%08x\n",
1028                 ha->host_no, __func__, ha->flags, ha->dpc_flags,
1029                 readw(&ha->reg->ctrl_status)));
1030
1031         /* Initialization not yet finished. Don't do anything yet. */
1032         if (!test_bit(AF_INIT_DONE, &ha->flags))
1033                 return;
1034
1035         if (adapter_up(ha) ||
1036             test_bit(DPC_RESET_HA, &ha->dpc_flags) ||
1037             test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags) ||
1038             test_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags)) {
1039                 if (test_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags) ||
1040                         test_bit(DPC_RESET_HA, &ha->dpc_flags))
1041                         qla4xxx_recover_adapter(ha, PRESERVE_DDB_LIST);
1042
1043                 if (test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags)) {
1044                         uint8_t wait_time = RESET_INTR_TOV;
1045
1046                         while ((readw(&ha->reg->ctrl_status) &
1047                                 (CSR_SOFT_RESET | CSR_FORCE_SOFT_RESET)) != 0) {
1048                                 if (--wait_time == 0)
1049                                         break;
1050                                 msleep(1000);
1051                         }
1052                         if (wait_time == 0)
1053                                 DEBUG2(printk("scsi%ld: %s: SR|FSR "
1054                                               "bit not cleared-- resetting\n",
1055                                               ha->host_no, __func__));
1056                         qla4xxx_flush_active_srbs(ha);
1057                         if (ql4xxx_lock_drvr_wait(ha) == QLA_SUCCESS) {
1058                                 qla4xxx_process_aen(ha, FLUSH_DDB_CHANGED_AENS);
1059                                 status = qla4xxx_initialize_adapter(ha,
1060                                                 PRESERVE_DDB_LIST);
1061                         }
1062                         clear_bit(DPC_RESET_HA_INTR, &ha->dpc_flags);
1063                         if (status == QLA_SUCCESS)
1064                                 qla4xxx_enable_intrs(ha);
1065                 }
1066         }
1067
1068         /* ---- process AEN? --- */
1069         if (test_and_clear_bit(DPC_AEN, &ha->dpc_flags))
1070                 qla4xxx_process_aen(ha, PROCESS_ALL_AENS);
1071
1072         /* ---- Get DHCP IP Address? --- */
1073         if (test_and_clear_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags))
1074                 qla4xxx_get_dhcp_ip_address(ha);
1075
1076         /* ---- link change? --- */
1077         if (test_and_clear_bit(DPC_LINK_CHANGED, &ha->dpc_flags)) {
1078                 if (!test_bit(AF_LINK_UP, &ha->flags)) {
1079                         /* ---- link down? --- */
1080                         list_for_each_entry_safe(ddb_entry, dtemp,
1081                                                  &ha->ddb_list, list) {
1082                                 if (atomic_read(&ddb_entry->state) ==
1083                                                 DDB_STATE_ONLINE)
1084                                         qla4xxx_mark_device_missing(ha,
1085                                                         ddb_entry);
1086                         }
1087                 } else {
1088                         /* ---- link up? --- *
1089                          * F/W will auto login to all devices ONLY ONCE after
1090                          * link up during driver initialization and runtime
1091                          * fatal error recovery.  Therefore, the driver must
1092                          * manually relogin to devices when recovering from
1093                          * connection failures, logouts, expired KATO, etc. */
1094
1095                         list_for_each_entry_safe(ddb_entry, dtemp,
1096                                                         &ha->ddb_list, list) {
1097                                 if ((atomic_read(&ddb_entry->state) ==
1098                                                  DDB_STATE_MISSING) ||
1099                                     (atomic_read(&ddb_entry->state) ==
1100                                                  DDB_STATE_DEAD)) {
1101                                         if (ddb_entry->fw_ddb_device_state ==
1102                                             DDB_DS_SESSION_ACTIVE) {
1103                                                 atomic_set(&ddb_entry->state,
1104                                                            DDB_STATE_ONLINE);
1105                                                 dev_info(&ha->pdev->dev,
1106                                                     "scsi%ld: %s: ddb[%d]"
1107                                                     " os[%d] marked"
1108                                                     " ONLINE\n",
1109                                                     ha->host_no, __func__,
1110                                                     ddb_entry->fw_ddb_index,
1111                                                     ddb_entry->os_target_id);
1112
1113                                                 iscsi_unblock_session(
1114                                                     ddb_entry->sess);
1115                                         } else
1116                                                 qla4xxx_relogin_device(
1117                                                     ha, ddb_entry);
1118                                 }
1119
1120                         }
1121                 }
1122         }
1123
1124         /* ---- relogin device? --- */
1125         if (adapter_up(ha) &&
1126             test_and_clear_bit(DPC_RELOGIN_DEVICE, &ha->dpc_flags)) {
1127                 list_for_each_entry_safe(ddb_entry, dtemp,
1128                                          &ha->ddb_list, list) {
1129                         if (test_and_clear_bit(DF_RELOGIN, &ddb_entry->flags) &&
1130                             atomic_read(&ddb_entry->state) != DDB_STATE_ONLINE)
1131                                 qla4xxx_relogin_device(ha, ddb_entry);
1132
1133                         /*
1134                          * If mbx cmd times out there is no point
1135                          * in continuing further.
1136                          * With large no of targets this can hang
1137                          * the system.
1138                          */
1139                         if (test_bit(DPC_RESET_HA, &ha->dpc_flags)) {
1140                                 printk(KERN_WARNING "scsi%ld: %s: "
1141                                        "need to reset hba\n",
1142                                        ha->host_no, __func__);
1143                                 break;
1144                         }
1145                 }
1146         }
1147 }
1148
1149 /**
1150  * qla4xxx_free_adapter - release the adapter
1151  * @ha: pointer to adapter structure
1152  **/
1153 static void qla4xxx_free_adapter(struct scsi_qla_host *ha)
1154 {
1155
1156         if (test_bit(AF_INTERRUPTS_ON, &ha->flags)) {
1157                 /* Turn-off interrupts on the card. */
1158                 qla4xxx_disable_intrs(ha);
1159         }
1160
1161         /* Kill the kernel thread for this host */
1162         if (ha->dpc_thread)
1163                 destroy_workqueue(ha->dpc_thread);
1164
1165         /* Issue Soft Reset to put firmware in unknown state */
1166         if (ql4xxx_lock_drvr_wait(ha) == QLA_SUCCESS)
1167                 qla4xxx_hw_reset(ha);
1168
1169         /* Remove timer thread, if present */
1170         if (ha->timer_active)
1171                 qla4xxx_stop_timer(ha);
1172
1173         /* Detach interrupts */
1174         if (test_and_clear_bit(AF_IRQ_ATTACHED, &ha->flags))
1175                 free_irq(ha->pdev->irq, ha);
1176
1177         /* free extra memory */
1178         qla4xxx_mem_free(ha);
1179
1180         pci_disable_device(ha->pdev);
1181
1182 }
1183
1184 /***
1185  * qla4xxx_iospace_config - maps registers
1186  * @ha: pointer to adapter structure
1187  *
1188  * This routines maps HBA's registers from the pci address space
1189  * into the kernel virtual address space for memory mapped i/o.
1190  **/
1191 static int qla4xxx_iospace_config(struct scsi_qla_host *ha)
1192 {
1193         unsigned long pio, pio_len, pio_flags;
1194         unsigned long mmio, mmio_len, mmio_flags;
1195
1196         pio = pci_resource_start(ha->pdev, 0);
1197         pio_len = pci_resource_len(ha->pdev, 0);
1198         pio_flags = pci_resource_flags(ha->pdev, 0);
1199         if (pio_flags & IORESOURCE_IO) {
1200                 if (pio_len < MIN_IOBASE_LEN) {
1201                         dev_warn(&ha->pdev->dev,
1202                                 "Invalid PCI I/O region size\n");
1203                         pio = 0;
1204                 }
1205         } else {
1206                 dev_warn(&ha->pdev->dev, "region #0 not a PIO resource\n");
1207                 pio = 0;
1208         }
1209
1210         /* Use MMIO operations for all accesses. */
1211         mmio = pci_resource_start(ha->pdev, 1);
1212         mmio_len = pci_resource_len(ha->pdev, 1);
1213         mmio_flags = pci_resource_flags(ha->pdev, 1);
1214
1215         if (!(mmio_flags & IORESOURCE_MEM)) {
1216                 dev_err(&ha->pdev->dev,
1217                         "region #0 not an MMIO resource, aborting\n");
1218
1219                 goto iospace_error_exit;
1220         }
1221         if (mmio_len < MIN_IOBASE_LEN) {
1222                 dev_err(&ha->pdev->dev,
1223                         "Invalid PCI mem region size, aborting\n");
1224                 goto iospace_error_exit;
1225         }
1226
1227         if (pci_request_regions(ha->pdev, DRIVER_NAME)) {
1228                 dev_warn(&ha->pdev->dev,
1229                         "Failed to reserve PIO/MMIO regions\n");
1230
1231                 goto iospace_error_exit;
1232         }
1233
1234         ha->pio_address = pio;
1235         ha->pio_length = pio_len;
1236         ha->reg = ioremap(mmio, MIN_IOBASE_LEN);
1237         if (!ha->reg) {
1238                 dev_err(&ha->pdev->dev,
1239                         "cannot remap MMIO, aborting\n");
1240
1241                 goto iospace_error_exit;
1242         }
1243
1244         return 0;
1245
1246 iospace_error_exit:
1247         return -ENOMEM;
1248 }
1249
1250 /**
1251  * qla4xxx_probe_adapter - callback function to probe HBA
1252  * @pdev: pointer to pci_dev structure
1253  * @pci_device_id: pointer to pci_device entry
1254  *
1255  * This routine will probe for Qlogic 4xxx iSCSI host adapters.
1256  * It returns zero if successful. It also initializes all data necessary for
1257  * the driver.
1258  **/
1259 static int __devinit qla4xxx_probe_adapter(struct pci_dev *pdev,
1260                                            const struct pci_device_id *ent)
1261 {
1262         int ret = -ENODEV, status;
1263         struct Scsi_Host *host;
1264         struct scsi_qla_host *ha;
1265         uint8_t init_retry_count = 0;
1266         char buf[34];
1267
1268         if (pci_enable_device(pdev))
1269                 return -1;
1270
1271         host = scsi_host_alloc(&qla4xxx_driver_template, sizeof(*ha));
1272         if (host == NULL) {
1273                 printk(KERN_WARNING
1274                        "qla4xxx: Couldn't allocate host from scsi layer!\n");
1275                 goto probe_disable_device;
1276         }
1277
1278         /* Clear our data area */
1279         ha = (struct scsi_qla_host *) host->hostdata;
1280         memset(ha, 0, sizeof(*ha));
1281
1282         /* Save the information from PCI BIOS.  */
1283         ha->pdev = pdev;
1284         ha->host = host;
1285         ha->host_no = host->host_no;
1286
1287         /* Configure PCI I/O space. */
1288         ret = qla4xxx_iospace_config(ha);
1289         if (ret)
1290                 goto probe_failed;
1291
1292         dev_info(&ha->pdev->dev, "Found an ISP%04x, irq %d, iobase 0x%p\n",
1293                    pdev->device, pdev->irq, ha->reg);
1294
1295         qla4xxx_config_dma_addressing(ha);
1296
1297         /* Initialize lists and spinlocks. */
1298         INIT_LIST_HEAD(&ha->ddb_list);
1299         INIT_LIST_HEAD(&ha->free_srb_q);
1300
1301         mutex_init(&ha->mbox_sem);
1302
1303         spin_lock_init(&ha->hardware_lock);
1304
1305         /* Allocate dma buffers */
1306         if (qla4xxx_mem_alloc(ha)) {
1307                 dev_warn(&ha->pdev->dev,
1308                            "[ERROR] Failed to allocate memory for adapter\n");
1309
1310                 ret = -ENOMEM;
1311                 goto probe_failed;
1312         }
1313
1314         /*
1315          * Initialize the Host adapter request/response queues and
1316          * firmware
1317          * NOTE: interrupts enabled upon successful completion
1318          */
1319         status = qla4xxx_initialize_adapter(ha, REBUILD_DDB_LIST);
1320         while (status == QLA_ERROR && init_retry_count++ < MAX_INIT_RETRIES) {
1321                 DEBUG2(printk("scsi: %s: retrying adapter initialization "
1322                               "(%d)\n", __func__, init_retry_count));
1323                 qla4xxx_soft_reset(ha);
1324                 status = qla4xxx_initialize_adapter(ha, REBUILD_DDB_LIST);
1325         }
1326         if (status == QLA_ERROR) {
1327                 dev_warn(&ha->pdev->dev, "Failed to initialize adapter\n");
1328
1329                 ret = -ENODEV;
1330                 goto probe_failed;
1331         }
1332
1333         host->cmd_per_lun = 3;
1334         host->max_channel = 0;
1335         host->max_lun = MAX_LUNS - 1;
1336         host->max_id = MAX_TARGETS;
1337         host->max_cmd_len = IOCB_MAX_CDB_LEN;
1338         host->can_queue = MAX_SRBS ;
1339         host->transportt = qla4xxx_scsi_transport;
1340
1341         ret = scsi_init_shared_tag_map(host, MAX_SRBS);
1342         if (ret) {
1343                 dev_warn(&ha->pdev->dev, "scsi_init_shared_tag_map failed\n");
1344                 goto probe_failed;
1345         }
1346
1347         /* Startup the kernel thread for this host adapter. */
1348         DEBUG2(printk("scsi: %s: Starting kernel thread for "
1349                       "qla4xxx_dpc\n", __func__));
1350         sprintf(buf, "qla4xxx_%lu_dpc", ha->host_no);
1351         ha->dpc_thread = create_singlethread_workqueue(buf);
1352         if (!ha->dpc_thread) {
1353                 dev_warn(&ha->pdev->dev, "Unable to start DPC thread!\n");
1354                 ret = -ENODEV;
1355                 goto probe_failed;
1356         }
1357         INIT_WORK(&ha->dpc_work, qla4xxx_do_dpc);
1358
1359         ret = request_irq(pdev->irq, qla4xxx_intr_handler,
1360                           IRQF_DISABLED | IRQF_SHARED, "qla4xxx", ha);
1361         if (ret) {
1362                 dev_warn(&ha->pdev->dev, "Failed to reserve interrupt %d"
1363                         " already in use.\n", pdev->irq);
1364                 goto probe_failed;
1365         }
1366         set_bit(AF_IRQ_ATTACHED, &ha->flags);
1367         host->irq = pdev->irq;
1368         DEBUG(printk("scsi%d: irq %d attached\n", ha->host_no, ha->pdev->irq));
1369
1370         qla4xxx_enable_intrs(ha);
1371
1372         /* Start timer thread. */
1373         qla4xxx_start_timer(ha, qla4xxx_timer, 1);
1374
1375         set_bit(AF_INIT_DONE, &ha->flags);
1376
1377         pci_set_drvdata(pdev, ha);
1378
1379         ret = scsi_add_host(host, &pdev->dev);
1380         if (ret)
1381                 goto probe_failed;
1382
1383         printk(KERN_INFO
1384                " QLogic iSCSI HBA Driver version: %s\n"
1385                "  QLogic ISP%04x @ %s, host#=%ld, fw=%02d.%02d.%02d.%02d\n",
1386                qla4xxx_version_str, ha->pdev->device, pci_name(ha->pdev),
1387                ha->host_no, ha->firmware_version[0], ha->firmware_version[1],
1388                ha->patch_number, ha->build_number);
1389         scsi_scan_host(host);
1390         return 0;
1391
1392 probe_failed:
1393         qla4xxx_free_adapter(ha);
1394         scsi_host_put(ha->host);
1395
1396 probe_disable_device:
1397         pci_disable_device(pdev);
1398
1399         return ret;
1400 }
1401
1402 /**
1403  * qla4xxx_remove_adapter - calback function to remove adapter.
1404  * @pci_dev: PCI device pointer
1405  **/
1406 static void __devexit qla4xxx_remove_adapter(struct pci_dev *pdev)
1407 {
1408         struct scsi_qla_host *ha;
1409
1410         ha = pci_get_drvdata(pdev);
1411
1412         qla4xxx_disable_intrs(ha);
1413
1414         while (test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags))
1415                 ssleep(1);
1416
1417         /* remove devs from iscsi_sessions to scsi_devices */
1418         qla4xxx_free_ddb_list(ha);
1419
1420         scsi_remove_host(ha->host);
1421
1422         qla4xxx_free_adapter(ha);
1423
1424         scsi_host_put(ha->host);
1425
1426         pci_set_drvdata(pdev, NULL);
1427 }
1428
1429 /**
1430  * qla4xxx_config_dma_addressing() - Configure OS DMA addressing method.
1431  * @ha: HA context
1432  *
1433  * At exit, the @ha's flags.enable_64bit_addressing set to indicated
1434  * supported addressing method.
1435  */
1436 static void qla4xxx_config_dma_addressing(struct scsi_qla_host *ha)
1437 {
1438         int retval;
1439
1440         /* Update our PCI device dma_mask for full 64 bit mask */
1441         if (pci_set_dma_mask(ha->pdev, DMA_BIT_MASK(64)) == 0) {
1442                 if (pci_set_consistent_dma_mask(ha->pdev, DMA_BIT_MASK(64))) {
1443                         dev_dbg(&ha->pdev->dev,
1444                                   "Failed to set 64 bit PCI consistent mask; "
1445                                    "using 32 bit.\n");
1446                         retval = pci_set_consistent_dma_mask(ha->pdev,
1447                                                              DMA_BIT_MASK(32));
1448                 }
1449         } else
1450                 retval = pci_set_dma_mask(ha->pdev, DMA_BIT_MASK(32));
1451 }
1452
1453 static int qla4xxx_slave_alloc(struct scsi_device *sdev)
1454 {
1455         struct iscsi_cls_session *sess = starget_to_session(sdev->sdev_target);
1456         struct ddb_entry *ddb = sess->dd_data;
1457
1458         sdev->hostdata = ddb;
1459         sdev->tagged_supported = 1;
1460         scsi_activate_tcq(sdev, QL4_DEF_QDEPTH);
1461         return 0;
1462 }
1463
1464 static int qla4xxx_slave_configure(struct scsi_device *sdev)
1465 {
1466         sdev->tagged_supported = 1;
1467         return 0;
1468 }
1469
1470 static void qla4xxx_slave_destroy(struct scsi_device *sdev)
1471 {
1472         scsi_deactivate_tcq(sdev, 1);
1473 }
1474
1475 /**
1476  * qla4xxx_del_from_active_array - returns an active srb
1477  * @ha: Pointer to host adapter structure.
1478  * @index: index into the active_array
1479  *
1480  * This routine removes and returns the srb at the specified index
1481  **/
1482 struct srb * qla4xxx_del_from_active_array(struct scsi_qla_host *ha, uint32_t index)
1483 {
1484         struct srb *srb = NULL;
1485         struct scsi_cmnd *cmd = NULL;
1486
1487         cmd = scsi_host_find_tag(ha->host, index);
1488         if (!cmd)
1489                 return srb;
1490
1491         srb = (struct srb *)CMD_SP(cmd);
1492         if (!srb)
1493                 return srb;
1494
1495         /* update counters */
1496         if (srb->flags & SRB_DMA_VALID) {
1497                 ha->req_q_count += srb->iocb_cnt;
1498                 ha->iocb_cnt -= srb->iocb_cnt;
1499                 if (srb->cmd)
1500                         srb->cmd->host_scribble =
1501                                 (unsigned char *)(unsigned long) MAX_SRBS;
1502         }
1503         return srb;
1504 }
1505
1506 /**
1507  * qla4xxx_eh_wait_on_command - waits for command to be returned by firmware
1508  * @ha: Pointer to host adapter structure.
1509  * @cmd: Scsi Command to wait on.
1510  *
1511  * This routine waits for the command to be returned by the Firmware
1512  * for some max time.
1513  **/
1514 static int qla4xxx_eh_wait_on_command(struct scsi_qla_host *ha,
1515                                       struct scsi_cmnd *cmd)
1516 {
1517         int done = 0;
1518         struct srb *rp;
1519         uint32_t max_wait_time = EH_WAIT_CMD_TOV;
1520
1521         do {
1522                 /* Checking to see if its returned to OS */
1523                 rp = (struct srb *) CMD_SP(cmd);
1524                 if (rp == NULL) {
1525                         done++;
1526                         break;
1527                 }
1528
1529                 msleep(2000);
1530         } while (max_wait_time--);
1531
1532         return done;
1533 }
1534
1535 /**
1536  * qla4xxx_wait_for_hba_online - waits for HBA to come online
1537  * @ha: Pointer to host adapter structure
1538  **/
1539 static int qla4xxx_wait_for_hba_online(struct scsi_qla_host *ha)
1540 {
1541         unsigned long wait_online;
1542
1543         wait_online = jiffies + (30 * HZ);
1544         while (time_before(jiffies, wait_online)) {
1545
1546                 if (adapter_up(ha))
1547                         return QLA_SUCCESS;
1548                 else if (ha->retry_reset_ha_cnt == 0)
1549                         return QLA_ERROR;
1550
1551                 msleep(2000);
1552         }
1553
1554         return QLA_ERROR;
1555 }
1556
1557 /**
1558  * qla4xxx_eh_wait_for_commands - wait for active cmds to finish.
1559  * @ha: pointer to HBA
1560  * @t: target id
1561  * @l: lun id
1562  *
1563  * This function waits for all outstanding commands to a lun to complete. It
1564  * returns 0 if all pending commands are returned and 1 otherwise.
1565  **/
1566 static int qla4xxx_eh_wait_for_commands(struct scsi_qla_host *ha,
1567                                         struct scsi_target *stgt,
1568                                         struct scsi_device *sdev)
1569 {
1570         int cnt;
1571         int status = 0;
1572         struct scsi_cmnd *cmd;
1573
1574         /*
1575          * Waiting for all commands for the designated target or dev
1576          * in the active array
1577          */
1578         for (cnt = 0; cnt < ha->host->can_queue; cnt++) {
1579                 cmd = scsi_host_find_tag(ha->host, cnt);
1580                 if (cmd && stgt == scsi_target(cmd->device) &&
1581                     (!sdev || sdev == cmd->device)) {
1582                         if (!qla4xxx_eh_wait_on_command(ha, cmd)) {
1583                                 status++;
1584                                 break;
1585                         }
1586                 }
1587         }
1588         return status;
1589 }
1590
1591 /**
1592  * qla4xxx_eh_abort - callback for abort task.
1593  * @cmd: Pointer to Linux's SCSI command structure
1594  *
1595  * This routine is called by the Linux OS to abort the specified
1596  * command.
1597  **/
1598 static int qla4xxx_eh_abort(struct scsi_cmnd *cmd)
1599 {
1600         struct scsi_qla_host *ha = to_qla_host(cmd->device->host);
1601         unsigned int id = cmd->device->id;
1602         unsigned int lun = cmd->device->lun;
1603         unsigned long serial = cmd->serial_number;
1604         struct srb *srb = NULL;
1605         int ret = SUCCESS;
1606         int wait = 0;
1607
1608         dev_info(&ha->pdev->dev,
1609             "scsi%ld:%d:%d: Abort command issued cmd=%p, pid=%ld\n",
1610             ha->host_no, id, lun, cmd, serial);
1611
1612         srb = (struct srb *) CMD_SP(cmd);
1613
1614         if (!srb)
1615                 return SUCCESS;
1616
1617         kref_get(&srb->srb_ref);
1618
1619         if (qla4xxx_abort_task(ha, srb) != QLA_SUCCESS) {
1620                 DEBUG3(printk("scsi%ld:%d:%d: Abort_task mbx failed.\n",
1621                     ha->host_no, id, lun));
1622                 ret = FAILED;
1623         } else {
1624                 DEBUG3(printk("scsi%ld:%d:%d: Abort_task mbx success.\n",
1625                     ha->host_no, id, lun));
1626                 wait = 1;
1627         }
1628
1629         kref_put(&srb->srb_ref, qla4xxx_srb_compl);
1630
1631         /* Wait for command to complete */
1632         if (wait) {
1633                 if (!qla4xxx_eh_wait_on_command(ha, cmd)) {
1634                         DEBUG2(printk("scsi%ld:%d:%d: Abort handler timed out\n",
1635                             ha->host_no, id, lun));
1636                         ret = FAILED;
1637                 }
1638         }
1639
1640         dev_info(&ha->pdev->dev,
1641             "scsi%ld:%d:%d: Abort command - %s\n",
1642             ha->host_no, id, lun, (ret == SUCCESS) ? "succeded" : "failed");
1643
1644         return ret;
1645 }
1646
1647 /**
1648  * qla4xxx_eh_device_reset - callback for target reset.
1649  * @cmd: Pointer to Linux's SCSI command structure
1650  *
1651  * This routine is called by the Linux OS to reset all luns on the
1652  * specified target.
1653  **/
1654 static int qla4xxx_eh_device_reset(struct scsi_cmnd *cmd)
1655 {
1656         struct scsi_qla_host *ha = to_qla_host(cmd->device->host);
1657         struct ddb_entry *ddb_entry = cmd->device->hostdata;
1658         int ret = FAILED, stat;
1659
1660         if (!ddb_entry)
1661                 return ret;
1662
1663         dev_info(&ha->pdev->dev,
1664                    "scsi%ld:%d:%d:%d: DEVICE RESET ISSUED.\n", ha->host_no,
1665                    cmd->device->channel, cmd->device->id, cmd->device->lun);
1666
1667         DEBUG2(printk(KERN_INFO
1668                       "scsi%ld: DEVICE_RESET cmd=%p jiffies = 0x%lx, to=%x,"
1669                       "dpc_flags=%lx, status=%x allowed=%d\n", ha->host_no,
1670                       cmd, jiffies, cmd->request->timeout / HZ,
1671                       ha->dpc_flags, cmd->result, cmd->allowed));
1672
1673         /* FIXME: wait for hba to go online */
1674         stat = qla4xxx_reset_lun(ha, ddb_entry, cmd->device->lun);
1675         if (stat != QLA_SUCCESS) {
1676                 dev_info(&ha->pdev->dev, "DEVICE RESET FAILED. %d\n", stat);
1677                 goto eh_dev_reset_done;
1678         }
1679
1680         if (qla4xxx_eh_wait_for_commands(ha, scsi_target(cmd->device),
1681                                          cmd->device)) {
1682                 dev_info(&ha->pdev->dev,
1683                            "DEVICE RESET FAILED - waiting for "
1684                            "commands.\n");
1685                 goto eh_dev_reset_done;
1686         }
1687
1688         /* Send marker. */
1689         if (qla4xxx_send_marker_iocb(ha, ddb_entry, cmd->device->lun,
1690                 MM_LUN_RESET) != QLA_SUCCESS)
1691                 goto eh_dev_reset_done;
1692
1693         dev_info(&ha->pdev->dev,
1694                    "scsi(%ld:%d:%d:%d): DEVICE RESET SUCCEEDED.\n",
1695                    ha->host_no, cmd->device->channel, cmd->device->id,
1696                    cmd->device->lun);
1697
1698         ret = SUCCESS;
1699
1700 eh_dev_reset_done:
1701
1702         return ret;
1703 }
1704
1705 /**
1706  * qla4xxx_eh_target_reset - callback for target reset.
1707  * @cmd: Pointer to Linux's SCSI command structure
1708  *
1709  * This routine is called by the Linux OS to reset the target.
1710  **/
1711 static int qla4xxx_eh_target_reset(struct scsi_cmnd *cmd)
1712 {
1713         struct scsi_qla_host *ha = to_qla_host(cmd->device->host);
1714         struct ddb_entry *ddb_entry = cmd->device->hostdata;
1715         int stat;
1716
1717         if (!ddb_entry)
1718                 return FAILED;
1719
1720         starget_printk(KERN_INFO, scsi_target(cmd->device),
1721                        "WARM TARGET RESET ISSUED.\n");
1722
1723         DEBUG2(printk(KERN_INFO
1724                       "scsi%ld: TARGET_DEVICE_RESET cmd=%p jiffies = 0x%lx, "
1725                       "to=%x,dpc_flags=%lx, status=%x allowed=%d\n",
1726                       ha->host_no, cmd, jiffies, cmd->request->timeout / HZ,
1727                       ha->dpc_flags, cmd->result, cmd->allowed));
1728
1729         stat = qla4xxx_reset_target(ha, ddb_entry);
1730         if (stat != QLA_SUCCESS) {
1731                 starget_printk(KERN_INFO, scsi_target(cmd->device),
1732                                "WARM TARGET RESET FAILED.\n");
1733                 return FAILED;
1734         }
1735
1736         if (qla4xxx_eh_wait_for_commands(ha, scsi_target(cmd->device),
1737                                          NULL)) {
1738                 starget_printk(KERN_INFO, scsi_target(cmd->device),
1739                                "WARM TARGET DEVICE RESET FAILED - "
1740                                "waiting for commands.\n");
1741                 return FAILED;
1742         }
1743
1744         /* Send marker. */
1745         if (qla4xxx_send_marker_iocb(ha, ddb_entry, cmd->device->lun,
1746                 MM_TGT_WARM_RESET) != QLA_SUCCESS) {
1747                 starget_printk(KERN_INFO, scsi_target(cmd->device),
1748                                "WARM TARGET DEVICE RESET FAILED - "
1749                                "marker iocb failed.\n");
1750                 return FAILED;
1751         }
1752
1753         starget_printk(KERN_INFO, scsi_target(cmd->device),
1754                        "WARM TARGET RESET SUCCEEDED.\n");
1755         return SUCCESS;
1756 }
1757
1758 /**
1759  * qla4xxx_eh_host_reset - kernel callback
1760  * @cmd: Pointer to Linux's SCSI command structure
1761  *
1762  * This routine is invoked by the Linux kernel to perform fatal error
1763  * recovery on the specified adapter.
1764  **/
1765 static int qla4xxx_eh_host_reset(struct scsi_cmnd *cmd)
1766 {
1767         int return_status = FAILED;
1768         struct scsi_qla_host *ha;
1769
1770         ha = (struct scsi_qla_host *) cmd->device->host->hostdata;
1771
1772         dev_info(&ha->pdev->dev,
1773                    "scsi(%ld:%d:%d:%d): HOST RESET ISSUED.\n", ha->host_no,
1774                    cmd->device->channel, cmd->device->id, cmd->device->lun);
1775
1776         if (qla4xxx_wait_for_hba_online(ha) != QLA_SUCCESS) {
1777                 DEBUG2(printk("scsi%ld:%d: %s: Unable to reset host.  Adapter "
1778                               "DEAD.\n", ha->host_no, cmd->device->channel,
1779                               __func__));
1780
1781                 return FAILED;
1782         }
1783
1784         /* make sure the dpc thread is stopped while we reset the hba */
1785         clear_bit(AF_ONLINE, &ha->flags);
1786         flush_workqueue(ha->dpc_thread);
1787
1788         if (qla4xxx_recover_adapter(ha, PRESERVE_DDB_LIST) == QLA_SUCCESS)
1789                 return_status = SUCCESS;
1790
1791         dev_info(&ha->pdev->dev, "HOST RESET %s.\n",
1792                    return_status == FAILED ? "FAILED" : "SUCCEDED");
1793
1794         return return_status;
1795 }
1796
1797
1798 static struct pci_device_id qla4xxx_pci_tbl[] = {
1799         {
1800                 .vendor         = PCI_VENDOR_ID_QLOGIC,
1801                 .device         = PCI_DEVICE_ID_QLOGIC_ISP4010,
1802                 .subvendor      = PCI_ANY_ID,
1803                 .subdevice      = PCI_ANY_ID,
1804         },
1805         {
1806                 .vendor         = PCI_VENDOR_ID_QLOGIC,
1807                 .device         = PCI_DEVICE_ID_QLOGIC_ISP4022,
1808                 .subvendor      = PCI_ANY_ID,
1809                 .subdevice      = PCI_ANY_ID,
1810         },
1811         {
1812                 .vendor         = PCI_VENDOR_ID_QLOGIC,
1813                 .device         = PCI_DEVICE_ID_QLOGIC_ISP4032,
1814                 .subvendor      = PCI_ANY_ID,
1815                 .subdevice      = PCI_ANY_ID,
1816         },
1817         {0, 0},
1818 };
1819 MODULE_DEVICE_TABLE(pci, qla4xxx_pci_tbl);
1820
1821 static struct pci_driver qla4xxx_pci_driver = {
1822         .name           = DRIVER_NAME,
1823         .id_table       = qla4xxx_pci_tbl,
1824         .probe          = qla4xxx_probe_adapter,
1825         .remove         = qla4xxx_remove_adapter,
1826 };
1827
1828 static int __init qla4xxx_module_init(void)
1829 {
1830         int ret;
1831
1832         /* Allocate cache for SRBs. */
1833         srb_cachep = kmem_cache_create("qla4xxx_srbs", sizeof(struct srb), 0,
1834                                        SLAB_HWCACHE_ALIGN, NULL);
1835         if (srb_cachep == NULL) {
1836                 printk(KERN_ERR
1837                        "%s: Unable to allocate SRB cache..."
1838                        "Failing load!\n", DRIVER_NAME);
1839                 ret = -ENOMEM;
1840                 goto no_srp_cache;
1841         }
1842
1843         /* Derive version string. */
1844         strcpy(qla4xxx_version_str, QLA4XXX_DRIVER_VERSION);
1845         if (ql4xextended_error_logging)
1846                 strcat(qla4xxx_version_str, "-debug");
1847
1848         qla4xxx_scsi_transport =
1849                 iscsi_register_transport(&qla4xxx_iscsi_transport);
1850         if (!qla4xxx_scsi_transport){
1851                 ret = -ENODEV;
1852                 goto release_srb_cache;
1853         }
1854
1855         ret = pci_register_driver(&qla4xxx_pci_driver);
1856         if (ret)
1857                 goto unregister_transport;
1858
1859         printk(KERN_INFO "QLogic iSCSI HBA Driver\n");
1860         return 0;
1861
1862 unregister_transport:
1863         iscsi_unregister_transport(&qla4xxx_iscsi_transport);
1864 release_srb_cache:
1865         kmem_cache_destroy(srb_cachep);
1866 no_srp_cache:
1867         return ret;
1868 }
1869
1870 static void __exit qla4xxx_module_exit(void)
1871 {
1872         ql4_mod_unload = 1;
1873         pci_unregister_driver(&qla4xxx_pci_driver);
1874         iscsi_unregister_transport(&qla4xxx_iscsi_transport);
1875         kmem_cache_destroy(srb_cachep);
1876 }
1877
1878 module_init(qla4xxx_module_init);
1879 module_exit(qla4xxx_module_exit);
1880
1881 MODULE_AUTHOR("QLogic Corporation");
1882 MODULE_DESCRIPTION("QLogic iSCSI HBA Driver");
1883 MODULE_LICENSE("GPL");
1884 MODULE_VERSION(QLA4XXX_DRIVER_VERSION);