git.oblomov.eu Git - linux-2.6/blob - 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
   9 #include <scsi/scsi_tcq.h>
  10 #include <scsi/scsicam.h>
  11
  12 #include "ql4_def.h"
  13 #include "ql4_version.h"
  14 #include "ql4_glbl.h"
  15 #include "ql4_dbg.h"
  16 #include "ql4_inline.h"
  17
  18 /*
  19  * Driver version
  20  */
  21 static char qla4xxx_version_str[40];
  22
  23 /*
  24  * SRB allocation cache
  25  */
  26 static struct kmem_cache *srb_cachep;
  27
  28 /*
  29  * Module parameter information and variables
  30  */
  31 int ql4xdiscoverywait = 60;
  32 module_param(ql4xdiscoverywait, int, S_IRUGO | S_IRUSR);
  33 MODULE_PARM_DESC(ql4xdiscoverywait, "Discovery wait time");
  34 int ql4xdontresethba = 0;
  35 module_param(ql4xdontresethba, int, S_IRUGO | S_IRUSR);
  36 MODULE_PARM_DESC(ql4xdontresethba,
  37                  "Dont reset the HBA when the driver gets 0x8002 AEN "
  38                  " default it will reset hba :0"
  39                  " set to 1 to avoid resetting HBA");
  40
  41 int ql4xextended_error_logging = 0; /* 0 = off, 1 = log errors */
  42 module_param(ql4xextended_error_logging, int, S_IRUGO | S_IRUSR);
  43 MODULE_PARM_DESC(ql4xextended_error_logging,
  44                  "Option to enable extended error logging, "
  45                  "Default is 0 - no logging, 1 - debug logging");
  46
  47 int ql4_mod_unload = 0;
  48
  49 /*
  50  * SCSI host template entry points
  51  */
  52 static void qla4xxx_config_dma_addressing(struct scsi_qla_host *ha);
  53
  54 /*
  55  * iSCSI template entry points
  56  */
  57 static int qla4xxx_tgt_dscvr(struct Scsi_Host *shost,
  58                              enum iscsi_tgt_dscvr type, uint32_t enable,
  59                              struct sockaddr *dst_addr);
  60 static int qla4xxx_conn_get_param(struct iscsi_cls_conn *conn,
  61                                   enum iscsi_param param, char *buf);
  62 static int qla4xxx_sess_get_param(struct iscsi_cls_session *sess,
  63                                   enum iscsi_param param, char *buf);
  64 static int qla4xxx_host_get_param(struct Scsi_Host *shost,
  65                                   enum iscsi_host_param param, char *buf);
  66 static void qla4xxx_conn_stop(struct iscsi_cls_conn *conn, int flag);
  67 static int qla4xxx_conn_start(struct iscsi_cls_conn *conn);
  68 static void qla4xxx_recovery_timedout(struct iscsi_cls_session *session);
  69
  70 /*
  71  * SCSI host template entry points
  72  */
  73 static int qla4xxx_queuecommand(struct scsi_cmnd *cmd,
  74                                 void (*done) (struct scsi_cmnd *));
  75 static int qla4xxx_eh_device_reset(struct scsi_cmnd *cmd);
  76 static int qla4xxx_eh_host_reset(struct scsi_cmnd *cmd);
  77 static int qla4xxx_slave_alloc(struct scsi_device *device);
  78 static int qla4xxx_slave_configure(struct scsi_device *device);
  79 static void qla4xxx_slave_destroy(struct scsi_device *sdev);
  80
  81 static struct scsi_host_template qla4xxx_driver_template = {
  82         .module                 = THIS_MODULE,
  83         .name                   = DRIVER_NAME,
  84         .proc_name              = DRIVER_NAME,
  85         .queuecommand           = qla4xxx_queuecommand,
  86
  87         .eh_device_reset_handler = qla4xxx_eh_device_reset,
  88         .eh_host_reset_handler  = qla4xxx_eh_host_reset,
  89
  90         .slave_configure        = qla4xxx_slave_configure,
  91         .slave_alloc            = qla4xxx_slave_alloc,
  92         .slave_destroy          = qla4xxx_slave_destroy,
  93
  94         .this_id                = -1,
  95         .cmd_per_lun            = 3,
  96         .use_clustering         = ENABLE_CLUSTERING,
  97         .sg_tablesize           = SG_ALL,
  98
  99         .max_sectors            = 0xFFFF,
 100 };
 101
 102 static struct iscsi_transport qla4xxx_iscsi_transport = {
 103         .owner                  = THIS_MODULE,
 104         .name                   = DRIVER_NAME,
 105         .caps                   = CAP_FW_DB | CAP_SENDTARGETS_OFFLOAD,
 106         .param_mask             = ISCSI_CONN_PORT | ISCSI_CONN_ADDRESS |
 107                                   ISCSI_TARGET_NAME | ISCSI_TPGT,
 108         .host_param_mask        = ISCSI_HOST_HWADDRESS |
 109                                   ISCSI_HOST_INITIATOR_NAME,
 110         .sessiondata_size       = sizeof(struct ddb_entry),
 111         .host_template          = &qla4xxx_driver_template,
 112
 113         .tgt_dscvr              = qla4xxx_tgt_dscvr,
 114         .get_conn_param         = qla4xxx_conn_get_param,
 115         .get_session_param      = qla4xxx_sess_get_param,
 116         .get_host_param         = qla4xxx_host_get_param,
 117         .start_conn             = qla4xxx_conn_start,
 118         .stop_conn              = qla4xxx_conn_stop,
 119         .session_recovery_timedout = qla4xxx_recovery_timedout,
 120 };
 121
 122 static struct scsi_transport_template *qla4xxx_scsi_transport;
 123
 124 static void qla4xxx_recovery_timedout(struct iscsi_cls_session *session)
 125 {
 126         struct ddb_entry *ddb_entry = session->dd_data;
 127         struct scsi_qla_host *ha = ddb_entry->ha;
 128
 129         DEBUG2(printk("scsi%ld: %s: index [%d] port down retry count of (%d) "
 130                       "secs exhausted, marking device DEAD.\n", ha->host_no,
 131                       __func__, ddb_entry->fw_ddb_index,
 132                       ha->port_down_retry_count));
 133
 134         atomic_set(&ddb_entry->state, DDB_STATE_DEAD);
 135
 136         DEBUG2(printk("scsi%ld: %s: scheduling dpc routine - dpc flags = "
 137                       "0x%lx\n", ha->host_no, __func__, ha->dpc_flags));
 138         queue_work(ha->dpc_thread, &ha->dpc_work);
 139 }
 140
 141 static int qla4xxx_conn_start(struct iscsi_cls_conn *conn)
 142 {
 143         struct iscsi_cls_session *session;
 144         struct ddb_entry *ddb_entry;
 145
 146         session = iscsi_dev_to_session(conn->dev.parent);
 147         ddb_entry = session->dd_data;
 148
 149         DEBUG2(printk("scsi%ld: %s: index [%d] starting conn\n",
 150                       ddb_entry->ha->host_no, __func__,
 151                       ddb_entry->fw_ddb_index));
 152         iscsi_unblock_session(session);
 153         return 0;
 154 }
 155
 156 static void qla4xxx_conn_stop(struct iscsi_cls_conn *conn, int flag)
 157 {
 158         struct iscsi_cls_session *session;
 159         struct ddb_entry *ddb_entry;
 160
 161         session = iscsi_dev_to_session(conn->dev.parent);
 162         ddb_entry = session->dd_data;
 163
 164         DEBUG2(printk("scsi%ld: %s: index [%d] stopping conn\n",
 165                       ddb_entry->ha->host_no, __func__,
 166                       ddb_entry->fw_ddb_index));
 167         if (flag == STOP_CONN_RECOVER)
 168                 iscsi_block_session(session);
 169         else
 170                 printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag);
 171 }
 172
 173 static ssize_t format_addr(char *buf, const unsigned char *addr, int len)
 174 {
 175         int i;
 176         char *cp = buf;
 177
 178         for (i = 0; i < len; i++)
 179                 cp += sprintf(cp, "%02x%c", addr[i],
 180                               i == (len - 1) ? '\n' : ':');
 181         return cp - buf;
 182 }
 183
 184
 185 static int qla4xxx_host_get_param(struct Scsi_Host *shost,
 186                                   enum iscsi_host_param param, char *buf)
 187 {
 188         struct scsi_qla_host *ha = to_qla_host(shost);
 189         int len;
 190
 191         switch (param) {
 192         case ISCSI_HOST_PARAM_HWADDRESS:
 193                 len = format_addr(buf, ha->my_mac, MAC_ADDR_LEN);
 194                 break;
 195         case ISCSI_HOST_PARAM_INITIATOR_NAME:
 196                 len = sprintf(buf, ha->name_string);
 197                 break;
 198         default:
 199                 return -ENOSYS;
 200         }
 201
 202         return len;
 203 }
 204
 205 static int qla4xxx_sess_get_param(struct iscsi_cls_session *sess,
 206                                   enum iscsi_param param, char *buf)
 207 {
 208         struct ddb_entry *ddb_entry = sess->dd_data;
 209         int len;
 210
 211         switch (param) {
 212         case ISCSI_PARAM_TARGET_NAME:
 213                 len = snprintf(buf, PAGE_SIZE - 1, "%s\n",
 214                                ddb_entry->iscsi_name);
 215                 break;
 216         case ISCSI_PARAM_TPGT:
 217                 len = sprintf(buf, "%u\n", ddb_entry->tpgt);
 218                 break;
 219         default:
 220                 return -ENOSYS;
 221         }
 222
 223         return len;
 224 }
 225
 226 static int qla4xxx_conn_get_param(struct iscsi_cls_conn *conn,
 227                                   enum iscsi_param param, char *buf)
 228 {
 229         struct iscsi_cls_session *session;
 230         struct ddb_entry *ddb_entry;
 231         int len;
 232
 233         session = iscsi_dev_to_session(conn->dev.parent);
 234         ddb_entry = session->dd_data;
 235
 236         switch (param) {
 237         case ISCSI_PARAM_CONN_PORT:
 238                 len = sprintf(buf, "%hu\n", ddb_entry->port);
 239                 break;
 240         case ISCSI_PARAM_CONN_ADDRESS:
 241                 /* TODO: what are the ipv6 bits */
 242                 len = sprintf(buf, "%u.%u.%u.%u\n",
 243                               NIPQUAD(ddb_entry->ip_addr));
 244                 break;
 245         default:
 246                 return -ENOSYS;
 247         }
 248
 249         return len;
 250 }
 251
 252 static int qla4xxx_tgt_dscvr(struct Scsi_Host *shost,
 253                              enum iscsi_tgt_dscvr type, uint32_t enable,
 254                              struct sockaddr *dst_addr)
 255 {
 256         struct scsi_qla_host *ha;
 257         struct sockaddr_in *addr;
 258         struct sockaddr_in6 *addr6;
 259         int ret = 0;
 260
 261         ha = (struct scsi_qla_host *) shost->hostdata;
 262
 263         switch (type) {
 264         case ISCSI_TGT_DSCVR_SEND_TARGETS:
 265                 if (dst_addr->sa_family == AF_INET) {
 266                         addr = (struct sockaddr_in *)dst_addr;
 267                         if (qla4xxx_send_tgts(ha, (char *)&addr->sin_addr,
 268                                               addr->sin_port) != QLA_SUCCESS)
 269                                 ret = -EIO;
 270                 } else if (dst_addr->sa_family == AF_INET6) {
 271                         /*
 272                          * TODO: fix qla4xxx_send_tgts
 273                          */
 274                         addr6 = (struct sockaddr_in6 *)dst_addr;
 275                         if (qla4xxx_send_tgts(ha, (char *)&addr6->sin6_addr,
 276                                               addr6->sin6_port) != QLA_SUCCESS)
 277                                 ret = -EIO;
 278                 } else
 279                         ret = -ENOSYS;
 280                 break;
 281         default:
 282                 ret = -ENOSYS;
 283         }
 284         return ret;
 285 }
 286
 287 void qla4xxx_destroy_sess(struct ddb_entry *ddb_entry)
 288 {
 289         if (!ddb_entry->sess)
 290                 return;
 291
 292         if (ddb_entry->conn) {
 293                 iscsi_if_destroy_session_done(ddb_entry->conn);
 294                 iscsi_destroy_conn(ddb_entry->conn);
 295                 iscsi_remove_session(ddb_entry->sess);
 296         }
 297         iscsi_free_session(ddb_entry->sess);
 298 }
 299
 300 int qla4xxx_add_sess(struct ddb_entry *ddb_entry)
 301 {
 302         int err;
 303
 304         err = iscsi_add_session(ddb_entry->sess, ddb_entry->fw_ddb_index);
 305         if (err) {
 306                 DEBUG2(printk(KERN_ERR "Could not add session.\n"));
 307                 return err;
 308         }
 309
 310         ddb_entry->conn = iscsi_create_conn(ddb_entry->sess, 0);
 311         if (!ddb_entry->conn) {
 312                 iscsi_remove_session(ddb_entry->sess);
 313                 DEBUG2(printk(KERN_ERR "Could not add connection.\n"));
 314                 return -ENOMEM;
 315         }
 316
 317         ddb_entry->sess->recovery_tmo = ddb_entry->ha->port_down_retry_count;
 318         iscsi_if_create_session_done(ddb_entry->conn);
 319         return 0;
 320 }
 321
 322 struct ddb_entry *qla4xxx_alloc_sess(struct scsi_qla_host *ha)
 323 {
 324         struct ddb_entry *ddb_entry;
 325         struct iscsi_cls_session *sess;
 326
 327         sess = iscsi_alloc_session(ha->host, &qla4xxx_iscsi_transport);
 328         if (!sess)
 329                 return NULL;
 330
 331         ddb_entry = sess->dd_data;
 332         memset(ddb_entry, 0, sizeof(*ddb_entry));
 333         ddb_entry->ha = ha;
 334         ddb_entry->sess = sess;
 335         return ddb_entry;
 336 }
 337
 338 /*
 339  * Timer routines
 340  */
 341
 342 static void qla4xxx_start_timer(struct scsi_qla_host *ha, void *func,
 343                                 unsigned long interval)
 344 {
 345         DEBUG(printk("scsi: %s: Starting timer thread for adapter %d\n",
 346                      __func__, ha->host->host_no));
 347         init_timer(&ha->timer);
 348         ha->timer.expires = jiffies + interval * HZ;
 349         ha->timer.data = (unsigned long)ha;
 350         ha->timer.function = (void (*)(unsigned long))func;
 351         add_timer(&ha->timer);
 352         ha->timer_active = 1;
 353 }
 354
 355 static void qla4xxx_stop_timer(struct scsi_qla_host *ha)
 356 {
 357         del_timer_sync(&ha->timer);
 358         ha->timer_active = 0;
 359 }
 360
 361 /***
 362  * qla4xxx_mark_device_missing - mark a device as missing.
 363  * @ha: Pointer to host adapter structure.
 364  * @ddb_entry: Pointer to device database entry
 365  *
 366  * This routine marks a device missing and resets the relogin retry count.
 367  **/
 368 void qla4xxx_mark_device_missing(struct scsi_qla_host *ha,
 369                                  struct ddb_entry *ddb_entry)
 370 {
 371         atomic_set(&ddb_entry->state, DDB_STATE_MISSING);
 372         DEBUG3(printk("scsi%d:%d:%d: index [%d] marked MISSING\n",
 373                       ha->host_no, ddb_entry->bus, ddb_entry->target,
 374                       ddb_entry->fw_ddb_index));
 375         iscsi_conn_error(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         atomic_set(&srb->ref_count, 1);
 390         srb->ha = ha;
 391         srb->ddb = ddb_entry;
 392         srb->cmd = cmd;
 393         srb->flags = 0;
 394         cmd->SCp.ptr = (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->SCp.ptr = NULL;
 409 }
 410
 411 void qla4xxx_srb_compl(struct scsi_qla_host *ha, struct srb *srb)
 412 {
 413         struct scsi_cmnd *cmd = srb->cmd;
 414
 415         qla4xxx_srb_free_dma(ha, srb);
 416
 417         mempool_free(srb, ha->srb_mempool);
 418
 419         cmd->scsi_done(cmd);
 420 }
 421
 422 /**
 423  * qla4xxx_queuecommand - scsi layer issues scsi command to driver.
 424  * @cmd: Pointer to Linux's SCSI command structure
 425  * @done_fn: Function that the driver calls to notify the SCSI mid-layer
 426  *      that the command has been processed.
 427  *
 428  * Remarks:
 429  * This routine is invoked by Linux to send a SCSI command to the driver.
 430  * The mid-level driver tries to ensure that queuecommand never gets
 431  * invoked concurrently with itself or the interrupt handler (although
 432  * the interrupt handler may call this routine as part of request-
 433  * completion handling).   Unfortunely, it sometimes calls the scheduler
 434  * in interrupt context which is a big NO! NO!.
 435  **/
 436 static int qla4xxx_queuecommand(struct scsi_cmnd *cmd,
 437                                 void (*done)(struct scsi_cmnd *))
 438 {
 439         struct scsi_qla_host *ha = to_qla_host(cmd->device->host);
 440         struct ddb_entry *ddb_entry = cmd->device->hostdata;
 441         struct srb *srb;
 442         int rval;
 443
 444         if (atomic_read(&ddb_entry->state) != DDB_STATE_ONLINE) {
 445                 if (atomic_read(&ddb_entry->state) == DDB_STATE_DEAD) {
 446                         cmd->result = DID_NO_CONNECT << 16;
 447                         goto qc_fail_command;
 448                 }
 449                 goto qc_host_busy;
 450         }
 451
 452         if (test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags))
 453                 goto qc_host_busy;
 454
 455         spin_unlock_irq(ha->host->host_lock);
 456
 457         srb = qla4xxx_get_new_srb(ha, ddb_entry, cmd, done);
 458         if (!srb)
 459                 goto qc_host_busy_lock;
 460
 461         rval = qla4xxx_send_command_to_isp(ha, srb);
 462         if (rval != QLA_SUCCESS)
 463                 goto qc_host_busy_free_sp;
 464
 465         spin_lock_irq(ha->host->host_lock);
 466         return 0;
 467
 468 qc_host_busy_free_sp:
 469         qla4xxx_srb_free_dma(ha, srb);
 470         mempool_free(srb, ha->srb_mempool);
 471
 472 qc_host_busy_lock:
 473         spin_lock_irq(ha->host->host_lock);
 474
 475 qc_host_busy:
 476         return SCSI_MLQUEUE_HOST_BUSY;
 477
 478 qc_fail_command:
 479         done(cmd);
 480
 481         return 0;
 482 }
 483
 484 /**
 485  * qla4xxx_mem_free - frees memory allocated to adapter
 486  * @ha: Pointer to host adapter structure.
 487  *
 488  * Frees memory previously allocated by qla4xxx_mem_alloc
 489  **/
 490 static void qla4xxx_mem_free(struct scsi_qla_host *ha)
 491 {
 492         if (ha->queues)
 493                 dma_free_coherent(&ha->pdev->dev, ha->queues_len, ha->queues,
 494                                   ha->queues_dma);
 495
 496         ha->queues_len = 0;
 497         ha->queues = NULL;
 498         ha->queues_dma = 0;
 499         ha->request_ring = NULL;
 500         ha->request_dma = 0;
 501         ha->response_ring = NULL;
 502         ha->response_dma = 0;
 503         ha->shadow_regs = NULL;
 504         ha->shadow_regs_dma = 0;
 505
 506         /* Free srb pool. */
 507         if (ha->srb_mempool)
 508                 mempool_destroy(ha->srb_mempool);
 509
 510         ha->srb_mempool = NULL;
 511
 512         /* release io space registers  */
 513         if (ha->reg)
 514                 iounmap(ha->reg);
 515         pci_release_regions(ha->pdev);
 516 }
 517
 518 /**
 519  * qla4xxx_mem_alloc - allocates memory for use by adapter.
 520  * @ha: Pointer to host adapter structure
 521  *
 522  * Allocates DMA memory for request and response queues. Also allocates memory
 523  * for srbs.
 524  **/
 525 static int qla4xxx_mem_alloc(struct scsi_qla_host *ha)
 526 {
 527         unsigned long align;
 528
 529         /* Allocate contiguous block of DMA memory for queues. */
 530         ha->queues_len = ((REQUEST_QUEUE_DEPTH * QUEUE_SIZE) +
 531                           (RESPONSE_QUEUE_DEPTH * QUEUE_SIZE) +
 532                           sizeof(struct shadow_regs) +
 533                           MEM_ALIGN_VALUE +
 534                           (PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1);
 535         ha->queues = dma_alloc_coherent(&ha->pdev->dev, ha->queues_len,
 536                                         &ha->queues_dma, GFP_KERNEL);
 537         if (ha->queues == NULL) {
 538                 dev_warn(&ha->pdev->dev,
 539                         "Memory Allocation failed - queues.\n");
 540
 541                 goto mem_alloc_error_exit;
 542         }
 543         memset(ha->queues, 0, ha->queues_len);
 544
 545         /*
 546          * As per RISC alignment requirements -- the bus-address must be a
 547          * multiple of the request-ring size (in bytes).
 548          */
 549         align = 0;
 550         if ((unsigned long)ha->queues_dma & (MEM_ALIGN_VALUE - 1))
 551                 align = MEM_ALIGN_VALUE - ((unsigned long)ha->queues_dma &
 552                                            (MEM_ALIGN_VALUE - 1));
 553
 554         /* Update request and response queue pointers. */
 555         ha->request_dma = ha->queues_dma + align;
 556         ha->request_ring = (struct queue_entry *) (ha->queues + align);
 557         ha->response_dma = ha->queues_dma + align +
 558                 (REQUEST_QUEUE_DEPTH * QUEUE_SIZE);
 559         ha->response_ring = (struct queue_entry *) (ha->queues + align +
 560                                                     (REQUEST_QUEUE_DEPTH *
 561                                                      QUEUE_SIZE));
 562         ha->shadow_regs_dma = ha->queues_dma + align +
 563                 (REQUEST_QUEUE_DEPTH * QUEUE_SIZE) +
 564                 (RESPONSE_QUEUE_DEPTH * QUEUE_SIZE);
 565         ha->shadow_regs = (struct shadow_regs *) (ha->queues + align +
 566                                                   (REQUEST_QUEUE_DEPTH *
 567                                                    QUEUE_SIZE) +
 568                                                   (RESPONSE_QUEUE_DEPTH *
 569                                                    QUEUE_SIZE));
 570
 571         /* Allocate memory for srb pool. */
 572         ha->srb_mempool = mempool_create(SRB_MIN_REQ, mempool_alloc_slab,
 573                                          mempool_free_slab, srb_cachep);
 574         if (ha->srb_mempool == NULL) {
 575                 dev_warn(&ha->pdev->dev,
 576                         "Memory Allocation failed - SRB Pool.\n");
 577
 578                 goto mem_alloc_error_exit;
 579         }
 580
 581         return QLA_SUCCESS;
 582
 583 mem_alloc_error_exit:
 584         qla4xxx_mem_free(ha);
 585         return QLA_ERROR;
 586 }
 587
 588 /**
 589  * qla4xxx_timer - checks every second for work to do.
 590  * @ha: Pointer to host adapter structure.
 591  **/
 592 static void qla4xxx_timer(struct scsi_qla_host *ha)
 593 {
 594         struct ddb_entry *ddb_entry, *dtemp;
 595         int start_dpc = 0;
 596
 597         /* Search for relogin's to time-out and port down retry. */
 598         list_for_each_entry_safe(ddb_entry, dtemp, &ha->ddb_list, list) {
 599                 /* Count down time between sending relogins */
 600                 if (adapter_up(ha) &&
 601                     !test_bit(DF_RELOGIN, &ddb_entry->flags) &&
 602                     atomic_read(&ddb_entry->state) != DDB_STATE_ONLINE) {
 603                         if (atomic_read(&ddb_entry->retry_relogin_timer) !=
 604                             INVALID_ENTRY) {
 605                                 if (atomic_read(&ddb_entry->retry_relogin_timer)
 606                                                 == 0) {
 607                                         atomic_set(&ddb_entry->
 608                                                 retry_relogin_timer,
 609                                                 INVALID_ENTRY);
 610                                         set_bit(DPC_RELOGIN_DEVICE,
 611                                                 &ha->dpc_flags);
 612                                         set_bit(DF_RELOGIN, &ddb_entry->flags);
 613                                         DEBUG2(printk("scsi%ld: %s: index [%d]"
 614                                                       " login device\n",
 615                                                       ha->host_no, __func__,
 616                                                       ddb_entry->fw_ddb_index));
 617                                 } else
 618                                         atomic_dec(&ddb_entry->
 619                                                         retry_relogin_timer);
 620                         }
 621                 }
 622
 623                 /* Wait for relogin to timeout */
 624                 if (atomic_read(&ddb_entry->relogin_timer) &&
 625                     (atomic_dec_and_test(&ddb_entry->relogin_timer) != 0)) {
 626                         /*
 627                          * If the relogin times out and the device is
 628                          * still NOT ONLINE then try and relogin again.
 629                          */
 630                         if (atomic_read(&ddb_entry->state) !=
 631                             DDB_STATE_ONLINE &&
 632                             ddb_entry->fw_ddb_device_state ==
 633                             DDB_DS_SESSION_FAILED) {
 634                                 /* Reset retry relogin timer */
 635                                 atomic_inc(&ddb_entry->relogin_retry_count);
 636                                 DEBUG2(printk("scsi%ld: index[%d] relogin"
 637                                               " timed out-retrying"
 638                                               " relogin (%d)\n",
 639                                               ha->host_no,
 640                                               ddb_entry->fw_ddb_index,
 641                                               atomic_read(&ddb_entry->
 642                                                           relogin_retry_count))
 643                                         );
 644                                 start_dpc++;
 645                                 DEBUG(printk("scsi%ld:%d:%d: index [%d] "
 646                                              "initate relogin after"
 647                                              " %d seconds\n",
 648                                              ha->host_no, ddb_entry->bus,
 649                                              ddb_entry->target,
 650                                              ddb_entry->fw_ddb_index,
 651                                              ddb_entry->default_time2wait + 4)
 652                                         );
 653
 654                                 atomic_set(&ddb_entry->retry_relogin_timer,
 655                                            ddb_entry->default_time2wait + 4);
 656                         }
 657                 }
 658         }
 659
 660         /* Check for heartbeat interval. */
 661         if (ha->firmware_options & FWOPT_HEARTBEAT_ENABLE &&
 662             ha->heartbeat_interval != 0) {
 663                 ha->seconds_since_last_heartbeat++;
 664                 if (ha->seconds_since_last_heartbeat >
 665                     ha->heartbeat_interval + 2)
 666                         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 667         }
 668
 669
 670         /* Wakeup the dpc routine for this adapter, if needed. */
 671         if ((start_dpc ||
 672              test_bit(DPC_RESET_HA, &ha->dpc_flags) ||
 673              test_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags) ||
 674              test_bit(DPC_RELOGIN_DEVICE, &ha->dpc_flags) ||
 675              test_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags) ||
 676              test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags) ||
 677              test_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags) ||
 678              test_bit(DPC_AEN, &ha->dpc_flags)) &&
 679              ha->dpc_thread) {
 680                 DEBUG2(printk("scsi%ld: %s: scheduling dpc routine"
 681                               " - dpc flags = 0x%lx\n",
 682                               ha->host_no, __func__, ha->dpc_flags));
 683                 queue_work(ha->dpc_thread, &ha->dpc_work);
 684         }
 685
 686         /* Reschedule timer thread to call us back in one second */
 687         mod_timer(&ha->timer, jiffies + HZ);
 688
 689         DEBUG2(ha->seconds_since_last_intr++);
 690 }
 691
 692 /**
 693  * qla4xxx_cmd_wait - waits for all outstanding commands to complete
 694  * @ha: Pointer to host adapter structure.
 695  *
 696  * This routine stalls the driver until all outstanding commands are returned.
 697  * Caller must release the Hardware Lock prior to calling this routine.
 698  **/
 699 static int qla4xxx_cmd_wait(struct scsi_qla_host *ha)
 700 {
 701         uint32_t index = 0;
 702         int stat = QLA_SUCCESS;
 703         unsigned long flags;
 704         struct scsi_cmnd *cmd;
 705         int wait_cnt = WAIT_CMD_TOV;    /*
 706                                          * Initialized for 30 seconds as we
 707                                          * expect all commands to retuned
 708                                          * ASAP.
 709                                          */
 710
 711         while (wait_cnt) {
 712                 spin_lock_irqsave(&ha->hardware_lock, flags);
 713                 /* Find a command that hasn't completed. */
 714                 for (index = 0; index < ha->host->can_queue; index++) {
 715                         cmd = scsi_host_find_tag(ha->host, index);
 716                         if (cmd != NULL)
 717                                 break;
 718                 }
 719                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 720
 721                 /* If No Commands are pending, wait is complete */
 722                 if (index == ha->host->can_queue) {
 723                         break;
 724                 }
 725
 726                 /* If we timed out on waiting for commands to come back
 727                  * return ERROR.
 728                  */
 729                 wait_cnt--;
 730                 if (wait_cnt == 0)
 731                         stat = QLA_ERROR;
 732                 else {
 733                         msleep(1000);
 734                 }
 735         }                       /* End of While (wait_cnt) */
 736
 737         return stat;
 738 }
 739
 740 void qla4xxx_hw_reset(struct scsi_qla_host *ha)
 741 {
 742         uint32_t ctrl_status;
 743         unsigned long flags = 0;
 744
 745         DEBUG2(printk(KERN_ERR "scsi%ld: %s\n", ha->host_no, __func__));
 746
 747         spin_lock_irqsave(&ha->hardware_lock, flags);
 748
 749         /*
 750          * If the SCSI Reset Interrupt bit is set, clear it.
 751          * Otherwise, the Soft Reset won't work.
 752          */
 753         ctrl_status = readw(&ha->reg->ctrl_status);
 754         if ((ctrl_status & CSR_SCSI_RESET_INTR) != 0)
 755                 writel(set_rmask(CSR_SCSI_RESET_INTR), &ha->reg->ctrl_status);
 756
 757         /* Issue Soft Reset */
 758         writel(set_rmask(CSR_SOFT_RESET), &ha->reg->ctrl_status);
 759         readl(&ha->reg->ctrl_status);
 760
 761         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 762 }
 763
 764 /**
 765  * qla4xxx_soft_reset - performs soft reset.
 766  * @ha: Pointer to host adapter structure.
 767  **/
 768 int qla4xxx_soft_reset(struct scsi_qla_host *ha)
 769 {
 770         uint32_t max_wait_time;
 771         unsigned long flags = 0;
 772         int status = QLA_ERROR;
 773         uint32_t ctrl_status;
 774
 775         qla4xxx_hw_reset(ha);
 776
 777         /* Wait until the Network Reset Intr bit is cleared */
 778         max_wait_time = RESET_INTR_TOV;
 779         do {
 780                 spin_lock_irqsave(&ha->hardware_lock, flags);
 781                 ctrl_status = readw(&ha->reg->ctrl_status);
 782                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 783
 784                 if ((ctrl_status & CSR_NET_RESET_INTR) == 0)
 785                         break;
 786
 787                 msleep(1000);
 788         } while ((--max_wait_time));
 789
 790         if ((ctrl_status & CSR_NET_RESET_INTR) != 0) {
 791                 DEBUG2(printk(KERN_WARNING
 792                               "scsi%ld: Network Reset Intr not cleared by "
 793                               "Network function, clearing it now!\n",
 794                               ha->host_no));
 795                 spin_lock_irqsave(&ha->hardware_lock, flags);
 796                 writel(set_rmask(CSR_NET_RESET_INTR), &ha->reg->ctrl_status);
 797                 readl(&ha->reg->ctrl_status);
 798                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 799         }
 800
 801         /* Wait until the firmware tells us the Soft Reset is done */
 802         max_wait_time = SOFT_RESET_TOV;
 803         do {
 804                 spin_lock_irqsave(&ha->hardware_lock, flags);
 805                 ctrl_status = readw(&ha->reg->ctrl_status);
 806                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 807
 808                 if ((ctrl_status & CSR_SOFT_RESET) == 0) {
 809                         status = QLA_SUCCESS;
 810                         break;
 811                 }
 812
 813                 msleep(1000);
 814         } while ((--max_wait_time));
 815
 816         /*
 817          * Also, make sure that the SCSI Reset Interrupt bit has been cleared
 818          * after the soft reset has taken place.
 819          */
 820         spin_lock_irqsave(&ha->hardware_lock, flags);
 821         ctrl_status = readw(&ha->reg->ctrl_status);
 822         if ((ctrl_status & CSR_SCSI_RESET_INTR) != 0) {
 823                 writel(set_rmask(CSR_SCSI_RESET_INTR), &ha->reg->ctrl_status);
 824                 readl(&ha->reg->ctrl_status);
 825         }
 826         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 827
 828         /* If soft reset fails then most probably the bios on other
 829          * function is also enabled.
 830          * Since the initialization is sequential the other fn
 831          * wont be able to acknowledge the soft reset.
 832          * Issue a force soft reset to workaround this scenario.
 833          */
 834         if (max_wait_time == 0) {
 835                 /* Issue Force Soft Reset */
 836                 spin_lock_irqsave(&ha->hardware_lock, flags);
 837                 writel(set_rmask(CSR_FORCE_SOFT_RESET), &ha->reg->ctrl_status);
 838                 readl(&ha->reg->ctrl_status);
 839                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 840                 /* Wait until the firmware tells us the Soft Reset is done */
 841                 max_wait_time = SOFT_RESET_TOV;
 842                 do {
 843                         spin_lock_irqsave(&ha->hardware_lock, flags);
 844                         ctrl_status = readw(&ha->reg->ctrl_status);
 845                         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 846
 847                         if ((ctrl_status & CSR_FORCE_SOFT_RESET) == 0) {
 848                                 status = QLA_SUCCESS;
 849                                 break;
 850                         }
 851
 852                         msleep(1000);
 853                 } while ((--max_wait_time));
 854         }
 855
 856         return status;
 857 }
 858
 859 /**
 860  * qla4xxx_flush_active_srbs - returns all outstanding i/o requests to O.S.
 861  * @ha: Pointer to host adapter structure.
 862  *
 863  * This routine is called just prior to a HARD RESET to return all
 864  * outstanding commands back to the Operating System.
 865  * Caller should make sure that the following locks are released
 866  * before this calling routine: Hardware lock, and io_request_lock.
 867  **/
 868 static void qla4xxx_flush_active_srbs(struct scsi_qla_host *ha)
 869 {
 870         struct srb *srb;
 871         int i;
 872         unsigned long flags;
 873
 874         spin_lock_irqsave(&ha->hardware_lock, flags);
 875         for (i = 0; i < ha->host->can_queue; i++) {
 876                 srb = qla4xxx_del_from_active_array(ha, i);
 877                 if (srb != NULL) {
 878                         srb->cmd->result = DID_RESET << 16;
 879                         qla4xxx_srb_compl(ha, srb);
 880                 }
 881         }
 882         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 883
 884 }
 885
 886 /**
 887  * qla4xxx_recover_adapter - recovers adapter after a fatal error
 888  * @ha: Pointer to host adapter structure.
 889  * @renew_ddb_list: Indicates what to do with the adapter's ddb list
 890  *      after adapter recovery has completed.
 891  *      0=preserve ddb list, 1=destroy and rebuild ddb list
 892  **/
 893 static int qla4xxx_recover_adapter(struct scsi_qla_host *ha,
 894                                 uint8_t renew_ddb_list)
 895 {
 896         int status;
 897
 898         /* Stall incoming I/O until we are done */
 899         clear_bit(AF_ONLINE, &ha->flags);
 900         DEBUG2(printk("scsi%ld: %s calling qla4xxx_cmd_wait\n", ha->host_no,
 901                       __func__));
 902
 903         /* Wait for outstanding commands to complete.
 904          * Stalls the driver for max 30 secs
 905          */
 906         status = qla4xxx_cmd_wait(ha);
 907
 908         qla4xxx_disable_intrs(ha);
 909
 910         /* Flush any pending ddb changed AENs */
 911         qla4xxx_process_aen(ha, FLUSH_DDB_CHANGED_AENS);
 912
 913         /* Reset the firmware.  If successful, function
 914          * returns with ISP interrupts enabled.
 915          */
 916         if (status == QLA_SUCCESS) {
 917                 DEBUG2(printk("scsi%ld: %s - Performing soft reset..\n",
 918                               ha->host_no, __func__));
 919                 qla4xxx_flush_active_srbs(ha);
 920                 if (ql4xxx_lock_drvr_wait(ha) == QLA_SUCCESS)
 921                         status = qla4xxx_soft_reset(ha);
 922                 else
 923                         status = QLA_ERROR;
 924         }
 925
 926         /* Flush any pending ddb changed AENs */
 927         qla4xxx_process_aen(ha, FLUSH_DDB_CHANGED_AENS);
 928
 929         /* Re-initialize firmware. If successful, function returns
 930          * with ISP interrupts enabled */
 931         if (status == QLA_SUCCESS) {
 932                 DEBUG2(printk("scsi%ld: %s - Initializing adapter..\n",
 933                               ha->host_no, __func__));
 934
 935                 /* If successful, AF_ONLINE flag set in
 936                  * qla4xxx_initialize_adapter */
 937                 status = qla4xxx_initialize_adapter(ha, renew_ddb_list);
 938         }
 939
 940         /* Failed adapter initialization?
 941          * Retry reset_ha only if invoked via DPC (DPC_RESET_HA) */
 942         if ((test_bit(AF_ONLINE, &ha->flags) == 0) &&
 943             (test_bit(DPC_RESET_HA, &ha->dpc_flags))) {
 944                 /* Adapter initialization failed, see if we can retry
 945                  * resetting the ha */
 946                 if (!test_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags)) {
 947                         ha->retry_reset_ha_cnt = MAX_RESET_HA_RETRIES;
 948                         DEBUG2(printk("scsi%ld: recover adapter - retrying "
 949                                       "(%d) more times\n", ha->host_no,
 950                                       ha->retry_reset_ha_cnt));
 951                         set_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags);
 952                         status = QLA_ERROR;
 953                 } else {
 954                         if (ha->retry_reset_ha_cnt > 0) {
 955                                 /* Schedule another Reset HA--DPC will retry */
 956                                 ha->retry_reset_ha_cnt--;
 957                                 DEBUG2(printk("scsi%ld: recover adapter - "
 958                                               "retry remaining %d\n",
 959                                               ha->host_no,
 960                                               ha->retry_reset_ha_cnt));
 961                                 status = QLA_ERROR;
 962                         }
 963
 964                         if (ha->retry_reset_ha_cnt == 0) {
 965                                 /* Recover adapter retries have been exhausted.
 966                                  * Adapter DEAD */
 967                                 DEBUG2(printk("scsi%ld: recover adapter "
 968                                               "failed - board disabled\n",
 969                                               ha->host_no));
 970                                 qla4xxx_flush_active_srbs(ha);
 971                                 clear_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags);
 972                                 clear_bit(DPC_RESET_HA, &ha->dpc_flags);
 973                                 clear_bit(DPC_RESET_HA_DESTROY_DDB_LIST,
 974                                           &ha->dpc_flags);
 975                                 status = QLA_ERROR;
 976                         }
 977                 }
 978         } else {
 979                 clear_bit(DPC_RESET_HA, &ha->dpc_flags);
 980                 clear_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags);
 981                 clear_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags);
 982         }
 983
 984         ha->adapter_error_count++;
 985
 986         if (status == QLA_SUCCESS)
 987                 qla4xxx_enable_intrs(ha);
 988
 989         DEBUG2(printk("scsi%ld: recover adapter .. DONE\n", ha->host_no));
 990         return status;
 991 }
 992
 993 /**
 994  * qla4xxx_do_dpc - dpc routine
 995  * @data: in our case pointer to adapter structure
 996  *
 997  * This routine is a task that is schedule by the interrupt handler
 998  * to perform the background processing for interrupts.  We put it
 999  * on a task queue that is consumed whenever the scheduler runs; that's
1000  * so you can do anything (i.e. put the process to sleep etc).  In fact,
1001  * the mid-level tries to sleep when it reaches the driver threshold
1002  * "host->can_queue". This can cause a panic if we were in our interrupt code.
1003  **/
1004 static void qla4xxx_do_dpc(struct work_struct *work)
1005 {
1006         struct scsi_qla_host *ha =
1007                 container_of(work, struct scsi_qla_host, dpc_work);
1008         struct ddb_entry *ddb_entry, *dtemp;
1009         int status = QLA_ERROR;
1010
1011         DEBUG2(printk("scsi%ld: %s: DPC handler waking up."
1012                 "flags = 0x%08lx, dpc_flags = 0x%08lx ctrl_stat = 0x%08x\n",
1013                 ha->host_no, __func__, ha->flags, ha->dpc_flags,
1014                 readw(&ha->reg->ctrl_status)));
1015
1016         /* Initialization not yet finished. Don't do anything yet. */
1017         if (!test_bit(AF_INIT_DONE, &ha->flags))
1018                 return;
1019
1020         if (adapter_up(ha) ||
1021             test_bit(DPC_RESET_HA, &ha->dpc_flags) ||
1022             test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags) ||
1023             test_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags)) {
1024                 if (test_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags) ||
1025                         test_bit(DPC_RESET_HA, &ha->dpc_flags))
1026                         qla4xxx_recover_adapter(ha, PRESERVE_DDB_LIST);
1027
1028                 if (test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags)) {
1029                         uint8_t wait_time = RESET_INTR_TOV;
1030
1031                         while ((readw(&ha->reg->ctrl_status) &
1032                                 (CSR_SOFT_RESET | CSR_FORCE_SOFT_RESET)) != 0) {
1033                                 if (--wait_time == 0)
1034                                         break;
1035                                 msleep(1000);
1036                         }
1037                         if (wait_time == 0)
1038                                 DEBUG2(printk("scsi%ld: %s: SR|FSR "
1039                                               "bit not cleared-- resetting\n",
1040                                               ha->host_no, __func__));
1041                         qla4xxx_flush_active_srbs(ha);
1042                         if (ql4xxx_lock_drvr_wait(ha) == QLA_SUCCESS) {
1043                                 qla4xxx_process_aen(ha, FLUSH_DDB_CHANGED_AENS);
1044                                 status = qla4xxx_initialize_adapter(ha,
1045                                                 PRESERVE_DDB_LIST);
1046                         }
1047                         clear_bit(DPC_RESET_HA_INTR, &ha->dpc_flags);
1048                         if (status == QLA_SUCCESS)
1049                                 qla4xxx_enable_intrs(ha);
1050                 }
1051         }
1052
1053         /* ---- process AEN? --- */
1054         if (test_and_clear_bit(DPC_AEN, &ha->dpc_flags))
1055                 qla4xxx_process_aen(ha, PROCESS_ALL_AENS);
1056
1057         /* ---- Get DHCP IP Address? --- */
1058         if (test_and_clear_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags))
1059                 qla4xxx_get_dhcp_ip_address(ha);
1060
1061         /* ---- relogin device? --- */
1062         if (adapter_up(ha) &&
1063             test_and_clear_bit(DPC_RELOGIN_DEVICE, &ha->dpc_flags)) {
1064                 list_for_each_entry_safe(ddb_entry, dtemp,
1065                                          &ha->ddb_list, list) {
1066                         if (test_and_clear_bit(DF_RELOGIN, &ddb_entry->flags) &&
1067                             atomic_read(&ddb_entry->state) != DDB_STATE_ONLINE)
1068                                 qla4xxx_relogin_device(ha, ddb_entry);
1069
1070                         /*
1071                          * If mbx cmd times out there is no point
1072                          * in continuing further.
1073                          * With large no of targets this can hang
1074                          * the system.
1075                          */
1076                         if (test_bit(DPC_RESET_HA, &ha->dpc_flags)) {
1077                                 printk(KERN_WARNING "scsi%ld: %s: "
1078                                        "need to reset hba\n",
1079                                        ha->host_no, __func__);
1080                                 break;
1081                         }
1082                 }
1083         }
1084 }
1085
1086 /**
1087  * qla4xxx_free_adapter - release the adapter
1088  * @ha: pointer to adapter structure
1089  **/
1090 static void qla4xxx_free_adapter(struct scsi_qla_host *ha)
1091 {
1092
1093         if (test_bit(AF_INTERRUPTS_ON, &ha->flags)) {
1094                 /* Turn-off interrupts on the card. */
1095                 qla4xxx_disable_intrs(ha);
1096         }
1097
1098         /* Kill the kernel thread for this host */
1099         if (ha->dpc_thread)
1100                 destroy_workqueue(ha->dpc_thread);
1101
1102         /* Issue Soft Reset to put firmware in unknown state */
1103         if (ql4xxx_lock_drvr_wait(ha) == QLA_SUCCESS)
1104                 qla4xxx_hw_reset(ha);
1105
1106         /* Remove timer thread, if present */
1107         if (ha->timer_active)
1108                 qla4xxx_stop_timer(ha);
1109
1110         /* Detach interrupts */
1111         if (test_and_clear_bit(AF_IRQ_ATTACHED, &ha->flags))
1112                 free_irq(ha->pdev->irq, ha);
1113
1114         /* free extra memory */
1115         qla4xxx_mem_free(ha);
1116
1117         pci_disable_device(ha->pdev);
1118
1119 }
1120
1121 /***
1122  * qla4xxx_iospace_config - maps registers
1123  * @ha: pointer to adapter structure
1124  *
1125  * This routines maps HBA's registers from the pci address space
1126  * into the kernel virtual address space for memory mapped i/o.
1127  **/
1128 static int qla4xxx_iospace_config(struct scsi_qla_host *ha)
1129 {
1130         unsigned long pio, pio_len, pio_flags;
1131         unsigned long mmio, mmio_len, mmio_flags;
1132
1133         pio = pci_resource_start(ha->pdev, 0);
1134         pio_len = pci_resource_len(ha->pdev, 0);
1135         pio_flags = pci_resource_flags(ha->pdev, 0);
1136         if (pio_flags & IORESOURCE_IO) {
1137                 if (pio_len < MIN_IOBASE_LEN) {
1138                         dev_warn(&ha->pdev->dev,
1139                                 "Invalid PCI I/O region size\n");
1140                         pio = 0;
1141                 }
1142         } else {
1143                 dev_warn(&ha->pdev->dev, "region #0 not a PIO resource\n");
1144                 pio = 0;
1145         }
1146
1147         /* Use MMIO operations for all accesses. */
1148         mmio = pci_resource_start(ha->pdev, 1);
1149         mmio_len = pci_resource_len(ha->pdev, 1);
1150         mmio_flags = pci_resource_flags(ha->pdev, 1);
1151
1152         if (!(mmio_flags & IORESOURCE_MEM)) {
1153                 dev_err(&ha->pdev->dev,
1154                         "region #0 not an MMIO resource, aborting\n");
1155
1156                 goto iospace_error_exit;
1157         }
1158         if (mmio_len < MIN_IOBASE_LEN) {
1159                 dev_err(&ha->pdev->dev,
1160                         "Invalid PCI mem region size, aborting\n");
1161                 goto iospace_error_exit;
1162         }
1163
1164         if (pci_request_regions(ha->pdev, DRIVER_NAME)) {
1165                 dev_warn(&ha->pdev->dev,
1166                         "Failed to reserve PIO/MMIO regions\n");
1167
1168                 goto iospace_error_exit;
1169         }
1170
1171         ha->pio_address = pio;
1172         ha->pio_length = pio_len;
1173         ha->reg = ioremap(mmio, MIN_IOBASE_LEN);
1174         if (!ha->reg) {
1175                 dev_err(&ha->pdev->dev,
1176                         "cannot remap MMIO, aborting\n");
1177
1178                 goto iospace_error_exit;
1179         }
1180
1181         return 0;
1182
1183 iospace_error_exit:
1184         return -ENOMEM;
1185 }
1186
1187 /**
1188  * qla4xxx_probe_adapter - callback function to probe HBA
1189  * @pdev: pointer to pci_dev structure
1190  * @pci_device_id: pointer to pci_device entry
1191  *
1192  * This routine will probe for Qlogic 4xxx iSCSI host adapters.
1193  * It returns zero if successful. It also initializes all data necessary for
1194  * the driver.
1195  **/
1196 static int __devinit qla4xxx_probe_adapter(struct pci_dev *pdev,
1197                                            const struct pci_device_id *ent)
1198 {
1199         int ret = -ENODEV, status;
1200         struct Scsi_Host *host;
1201         struct scsi_qla_host *ha;
1202         struct ddb_entry *ddb_entry, *ddbtemp;
1203         uint8_t init_retry_count = 0;
1204         char buf[34];
1205
1206         if (pci_enable_device(pdev))
1207                 return -1;
1208
1209         host = scsi_host_alloc(&qla4xxx_driver_template, sizeof(*ha));
1210         if (host == NULL) {
1211                 printk(KERN_WARNING
1212                        "qla4xxx: Couldn't allocate host from scsi layer!\n");
1213                 goto probe_disable_device;
1214         }
1215
1216         /* Clear our data area */
1217         ha = (struct scsi_qla_host *) host->hostdata;
1218         memset(ha, 0, sizeof(*ha));
1219
1220         /* Save the information from PCI BIOS.  */
1221         ha->pdev = pdev;
1222         ha->host = host;
1223         ha->host_no = host->host_no;
1224
1225         /* Configure PCI I/O space. */
1226         ret = qla4xxx_iospace_config(ha);
1227         if (ret)
1228                 goto probe_failed;
1229
1230         dev_info(&ha->pdev->dev, "Found an ISP%04x, irq %d, iobase 0x%p\n",
1231                    pdev->device, pdev->irq, ha->reg);
1232
1233         qla4xxx_config_dma_addressing(ha);
1234
1235         /* Initialize lists and spinlocks. */
1236         INIT_LIST_HEAD(&ha->ddb_list);
1237         INIT_LIST_HEAD(&ha->free_srb_q);
1238
1239         mutex_init(&ha->mbox_sem);
1240
1241         spin_lock_init(&ha->hardware_lock);
1242
1243         /* Allocate dma buffers */
1244         if (qla4xxx_mem_alloc(ha)) {
1245                 dev_warn(&ha->pdev->dev,
1246                            "[ERROR] Failed to allocate memory for adapter\n");
1247
1248                 ret = -ENOMEM;
1249                 goto probe_failed;
1250         }
1251
1252         /*
1253          * Initialize the Host adapter request/response queues and
1254          * firmware
1255          * NOTE: interrupts enabled upon successful completion
1256          */
1257         status = qla4xxx_initialize_adapter(ha, REBUILD_DDB_LIST);
1258         while (status == QLA_ERROR && init_retry_count++ < MAX_INIT_RETRIES) {
1259                 DEBUG2(printk("scsi: %s: retrying adapter initialization "
1260                               "(%d)\n", __func__, init_retry_count));
1261                 qla4xxx_soft_reset(ha);
1262                 status = qla4xxx_initialize_adapter(ha, REBUILD_DDB_LIST);
1263         }
1264         if (status == QLA_ERROR) {
1265                 dev_warn(&ha->pdev->dev, "Failed to initialize adapter\n");
1266
1267                 ret = -ENODEV;
1268                 goto probe_failed;
1269         }
1270
1271         host->cmd_per_lun = 3;
1272         host->max_channel = 0;
1273         host->max_lun = MAX_LUNS - 1;
1274         host->max_id = MAX_TARGETS;
1275         host->max_cmd_len = IOCB_MAX_CDB_LEN;
1276         host->can_queue = MAX_SRBS ;
1277         host->transportt = qla4xxx_scsi_transport;
1278
1279         ret = scsi_init_shared_tag_map(host, MAX_SRBS);
1280         if (ret) {
1281                 dev_warn(&ha->pdev->dev, "scsi_init_shared_tag_map failed");
1282                 goto probe_failed;
1283         }
1284
1285         /* Startup the kernel thread for this host adapter. */
1286         DEBUG2(printk("scsi: %s: Starting kernel thread for "
1287                       "qla4xxx_dpc\n", __func__));
1288         sprintf(buf, "qla4xxx_%lu_dpc", ha->host_no);
1289         ha->dpc_thread = create_singlethread_workqueue(buf);
1290         if (!ha->dpc_thread) {
1291                 dev_warn(&ha->pdev->dev, "Unable to start DPC thread!\n");
1292                 ret = -ENODEV;
1293                 goto probe_failed;
1294         }
1295         INIT_WORK(&ha->dpc_work, qla4xxx_do_dpc);
1296
1297         ret = request_irq(pdev->irq, qla4xxx_intr_handler,
1298                           IRQF_DISABLED | IRQF_SHARED, "qla4xxx", ha);
1299         if (ret) {
1300                 dev_warn(&ha->pdev->dev, "Failed to reserve interrupt %d"
1301                         " already in use.\n", pdev->irq);
1302                 goto probe_failed;
1303         }
1304         set_bit(AF_IRQ_ATTACHED, &ha->flags);
1305         host->irq = pdev->irq;
1306         DEBUG(printk("scsi%d: irq %d attached\n", ha->host_no, ha->pdev->irq));
1307
1308         qla4xxx_enable_intrs(ha);
1309
1310         /* Start timer thread. */
1311         qla4xxx_start_timer(ha, qla4xxx_timer, 1);
1312
1313         set_bit(AF_INIT_DONE, &ha->flags);
1314
1315         pci_set_drvdata(pdev, ha);
1316
1317         ret = scsi_add_host(host, &pdev->dev);
1318         if (ret)
1319                 goto probe_failed;
1320
1321         /* Update transport device information for all devices. */
1322         list_for_each_entry_safe(ddb_entry, ddbtemp, &ha->ddb_list, list) {
1323                 if (ddb_entry->fw_ddb_device_state == DDB_DS_SESSION_ACTIVE)
1324                         if (qla4xxx_add_sess(ddb_entry))
1325                                 goto remove_host;
1326         }
1327
1328         printk(KERN_INFO
1329                " QLogic iSCSI HBA Driver version: %s\n"
1330                "  QLogic ISP%04x @ %s, host#=%ld, fw=%02d.%02d.%02d.%02d\n",
1331                qla4xxx_version_str, ha->pdev->device, pci_name(ha->pdev),
1332                ha->host_no, ha->firmware_version[0], ha->firmware_version[1],
1333                ha->patch_number, ha->build_number);
1334
1335         return 0;
1336
1337 remove_host:
1338         qla4xxx_free_ddb_list(ha);
1339         scsi_remove_host(host);
1340
1341 probe_failed:
1342         qla4xxx_free_adapter(ha);
1343         scsi_host_put(ha->host);
1344
1345 probe_disable_device:
1346         pci_disable_device(pdev);
1347
1348         return ret;
1349 }
1350
1351 /**
1352  * qla4xxx_remove_adapter - calback function to remove adapter.
1353  * @pci_dev: PCI device pointer
1354  **/
1355 static void __devexit qla4xxx_remove_adapter(struct pci_dev *pdev)
1356 {
1357         struct scsi_qla_host *ha;
1358
1359         ha = pci_get_drvdata(pdev);
1360
1361         qla4xxx_disable_intrs(ha);
1362
1363         while (test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags))
1364                 ssleep(1);
1365
1366         /* remove devs from iscsi_sessions to scsi_devices */
1367         qla4xxx_free_ddb_list(ha);
1368
1369         scsi_remove_host(ha->host);
1370
1371         qla4xxx_free_adapter(ha);
1372
1373         scsi_host_put(ha->host);
1374
1375         pci_set_drvdata(pdev, NULL);
1376 }
1377
1378 /**
1379  * qla4xxx_config_dma_addressing() - Configure OS DMA addressing method.
1380  * @ha: HA context
1381  *
1382  * At exit, the @ha's flags.enable_64bit_addressing set to indicated
1383  * supported addressing method.
1384  */
1385 static void qla4xxx_config_dma_addressing(struct scsi_qla_host *ha)
1386 {
1387         int retval;
1388
1389         /* Update our PCI device dma_mask for full 64 bit mask */
1390         if (pci_set_dma_mask(ha->pdev, DMA_64BIT_MASK) == 0) {
1391                 if (pci_set_consistent_dma_mask(ha->pdev, DMA_64BIT_MASK)) {
1392                         dev_dbg(&ha->pdev->dev,
1393                                   "Failed to set 64 bit PCI consistent mask; "
1394                                    "using 32 bit.\n");
1395                         retval = pci_set_consistent_dma_mask(ha->pdev,
1396                                                              DMA_32BIT_MASK);
1397                 }
1398         } else
1399                 retval = pci_set_dma_mask(ha->pdev, DMA_32BIT_MASK);
1400 }
1401
1402 static int qla4xxx_slave_alloc(struct scsi_device *sdev)
1403 {
1404         struct iscsi_cls_session *sess = starget_to_session(sdev->sdev_target);
1405         struct ddb_entry *ddb = sess->dd_data;
1406
1407         sdev->hostdata = ddb;
1408         sdev->tagged_supported = 1;
1409         scsi_activate_tcq(sdev, sdev->host->can_queue);
1410         return 0;
1411 }
1412
1413 static int qla4xxx_slave_configure(struct scsi_device *sdev)
1414 {
1415         sdev->tagged_supported = 1;
1416         return 0;
1417 }
1418
1419 static void qla4xxx_slave_destroy(struct scsi_device *sdev)
1420 {
1421         scsi_deactivate_tcq(sdev, 1);
1422 }
1423
1424 /**
1425  * qla4xxx_del_from_active_array - returns an active srb
1426  * @ha: Pointer to host adapter structure.
1427  * @index: index into to the active_array
1428  *
1429  * This routine removes and returns the srb at the specified index
1430  **/
1431 struct srb * qla4xxx_del_from_active_array(struct scsi_qla_host *ha, uint32_t index)
1432 {
1433         struct srb *srb = NULL;
1434         struct scsi_cmnd *cmd;
1435
1436         if (!(cmd = scsi_host_find_tag(ha->host, index)))
1437                 return srb;
1438
1439         if (!(srb = (struct srb *)cmd->host_scribble))
1440                 return srb;
1441
1442         /* update counters */
1443         if (srb->flags & SRB_DMA_VALID) {
1444                 ha->req_q_count += srb->iocb_cnt;
1445                 ha->iocb_cnt -= srb->iocb_cnt;
1446                 if (srb->cmd)
1447                         srb->cmd->host_scribble = NULL;
1448         }
1449         return srb;
1450 }
1451
1452 /**
1453  * qla4xxx_eh_wait_on_command - waits for command to be returned by firmware
1454  * @ha: actual ha whose done queue will contain the comd returned by firmware.
1455  * @cmd: Scsi Command to wait on.
1456  *
1457  * This routine waits for the command to be returned by the Firmware
1458  * for some max time.
1459  **/
1460 static int qla4xxx_eh_wait_on_command(struct scsi_qla_host *ha,
1461                                       struct scsi_cmnd *cmd)
1462 {
1463         int done = 0;
1464         struct srb *rp;
1465         uint32_t max_wait_time = EH_WAIT_CMD_TOV;
1466
1467         do {
1468                 /* Checking to see if its returned to OS */
1469                 rp = (struct srb *) cmd->SCp.ptr;
1470                 if (rp == NULL) {
1471                         done++;
1472                         break;
1473                 }
1474
1475                 msleep(2000);
1476         } while (max_wait_time--);
1477
1478         return done;
1479 }
1480
1481 /**
1482  * qla4xxx_wait_for_hba_online - waits for HBA to come online
1483  * @ha: Pointer to host adapter structure
1484  **/
1485 static int qla4xxx_wait_for_hba_online(struct scsi_qla_host *ha)
1486 {
1487         unsigned long wait_online;
1488
1489         wait_online = jiffies + (30 * HZ);
1490         while (time_before(jiffies, wait_online)) {
1491
1492                 if (adapter_up(ha))
1493                         return QLA_SUCCESS;
1494                 else if (ha->retry_reset_ha_cnt == 0)
1495                         return QLA_ERROR;
1496
1497                 msleep(2000);
1498         }
1499
1500         return QLA_ERROR;
1501 }
1502
1503 /**
1504  * qla4xxx_eh_wait_for_active_target_commands - wait for active cmds to finish.
1505  * @ha: pointer to to HBA
1506  * @t: target id
1507  * @l: lun id
1508  *
1509  * This function waits for all outstanding commands to a lun to complete. It
1510  * returns 0 if all pending commands are returned and 1 otherwise.
1511  **/
1512 static int qla4xxx_eh_wait_for_active_target_commands(struct scsi_qla_host *ha,
1513                                                  int t, int l)
1514 {
1515         int cnt;
1516         int status = 0;
1517         struct scsi_cmnd *cmd;
1518
1519         /*
1520          * Waiting for all commands for the designated target in the active
1521          * array
1522          */
1523         for (cnt = 0; cnt < ha->host->can_queue; cnt++) {
1524                 cmd = scsi_host_find_tag(ha->host, cnt);
1525                 if (cmd && cmd->device->id == t && cmd->device->lun == l) {
1526                         if (!qla4xxx_eh_wait_on_command(ha, cmd)) {
1527                                 status++;
1528                                 break;
1529                         }
1530                 }
1531         }
1532         return status;
1533 }
1534
1535 /**
1536  * qla4xxx_eh_device_reset - callback for target reset.
1537  * @cmd: Pointer to Linux's SCSI command structure
1538  *
1539  * This routine is called by the Linux OS to reset all luns on the
1540  * specified target.
1541  **/
1542 static int qla4xxx_eh_device_reset(struct scsi_cmnd *cmd)
1543 {
1544         struct scsi_qla_host *ha = to_qla_host(cmd->device->host);
1545         struct ddb_entry *ddb_entry = cmd->device->hostdata;
1546         struct srb *sp;
1547         int ret = FAILED, stat;
1548
1549         sp = (struct srb *) cmd->SCp.ptr;
1550         if (!sp || !ddb_entry)
1551                 return ret;
1552
1553         dev_info(&ha->pdev->dev,
1554                    "scsi%ld:%d:%d:%d: DEVICE RESET ISSUED.\n", ha->host_no,
1555                    cmd->device->channel, cmd->device->id, cmd->device->lun);
1556
1557         DEBUG2(printk(KERN_INFO
1558                       "scsi%ld: DEVICE_RESET cmd=%p jiffies = 0x%lx, to=%x,"
1559                       "dpc_flags=%lx, status=%x allowed=%d\n", ha->host_no,
1560                       cmd, jiffies, cmd->timeout_per_command / HZ,
1561                       ha->dpc_flags, cmd->result, cmd->allowed));
1562
1563         /* FIXME: wait for hba to go online */
1564         stat = qla4xxx_reset_lun(ha, ddb_entry, cmd->device->lun);
1565         if (stat != QLA_SUCCESS) {
1566                 dev_info(&ha->pdev->dev, "DEVICE RESET FAILED. %d\n", stat);
1567                 goto eh_dev_reset_done;
1568         }
1569
1570         /* Send marker. */
1571         ha->marker_needed = 1;
1572
1573         /*
1574          * If we are coming down the EH path, wait for all commands to complete
1575          * for the device.
1576          */
1577         if (cmd->device->host->shost_state == SHOST_RECOVERY) {
1578                 if (qla4xxx_eh_wait_for_active_target_commands(ha,
1579                                                           cmd->device->id,
1580                                                           cmd->device->lun)){
1581                         dev_info(&ha->pdev->dev,
1582                                    "DEVICE RESET FAILED - waiting for "
1583                                    "commands.\n");
1584                         goto eh_dev_reset_done;
1585                 }
1586         }
1587
1588         dev_info(&ha->pdev->dev,
1589                    "scsi(%ld:%d:%d:%d): DEVICE RESET SUCCEEDED.\n",
1590                    ha->host_no, cmd->device->channel, cmd->device->id,
1591                    cmd->device->lun);
1592
1593         ret = SUCCESS;
1594
1595 eh_dev_reset_done:
1596
1597         return ret;
1598 }
1599
1600 /**
1601  * qla4xxx_eh_host_reset - kernel callback
1602  * @cmd: Pointer to Linux's SCSI command structure
1603  *
1604  * This routine is invoked by the Linux kernel to perform fatal error
1605  * recovery on the specified adapter.
1606  **/
1607 static int qla4xxx_eh_host_reset(struct scsi_cmnd *cmd)
1608 {
1609         int return_status = FAILED;
1610         struct scsi_qla_host *ha;
1611
1612         ha = (struct scsi_qla_host *) cmd->device->host->hostdata;
1613
1614         dev_info(&ha->pdev->dev,
1615                    "scsi(%ld:%d:%d:%d): ADAPTER RESET ISSUED.\n", ha->host_no,
1616                    cmd->device->channel, cmd->device->id, cmd->device->lun);
1617
1618         if (qla4xxx_wait_for_hba_online(ha) != QLA_SUCCESS) {
1619                 DEBUG2(printk("scsi%ld:%d: %s: Unable to reset host.  Adapter "
1620                               "DEAD.\n", ha->host_no, cmd->device->channel,
1621                               __func__));
1622
1623                 return FAILED;
1624         }
1625
1626         if (qla4xxx_recover_adapter(ha, PRESERVE_DDB_LIST) == QLA_SUCCESS) {
1627                 return_status = SUCCESS;
1628         }
1629
1630         dev_info(&ha->pdev->dev, "HOST RESET %s.\n",
1631                    return_status == FAILED ? "FAILED" : "SUCCEDED");
1632
1633         return return_status;
1634 }
1635
1636
1637 static struct pci_device_id qla4xxx_pci_tbl[] = {
1638         {
1639                 .vendor         = PCI_VENDOR_ID_QLOGIC,
1640                 .device         = PCI_DEVICE_ID_QLOGIC_ISP4010,
1641                 .subvendor      = PCI_ANY_ID,
1642                 .subdevice      = PCI_ANY_ID,
1643         },
1644         {
1645                 .vendor         = PCI_VENDOR_ID_QLOGIC,
1646                 .device         = PCI_DEVICE_ID_QLOGIC_ISP4022,
1647                 .subvendor      = PCI_ANY_ID,
1648                 .subdevice      = PCI_ANY_ID,
1649         },
1650         {
1651                 .vendor         = PCI_VENDOR_ID_QLOGIC,
1652                 .device         = PCI_DEVICE_ID_QLOGIC_ISP4032,
1653                 .subvendor      = PCI_ANY_ID,
1654                 .subdevice      = PCI_ANY_ID,
1655         },
1656         {0, 0},
1657 };
1658 MODULE_DEVICE_TABLE(pci, qla4xxx_pci_tbl);
1659
1660 static struct pci_driver qla4xxx_pci_driver = {
1661         .name           = DRIVER_NAME,
1662         .id_table       = qla4xxx_pci_tbl,
1663         .probe          = qla4xxx_probe_adapter,
1664         .remove         = qla4xxx_remove_adapter,
1665 };
1666
1667 static int __init qla4xxx_module_init(void)
1668 {
1669         int ret;
1670
1671         /* Allocate cache for SRBs. */
1672         srb_cachep = kmem_cache_create("qla4xxx_srbs", sizeof(struct srb), 0,
1673                                        SLAB_HWCACHE_ALIGN, NULL, NULL);
1674         if (srb_cachep == NULL) {
1675                 printk(KERN_ERR
1676                        "%s: Unable to allocate SRB cache..."
1677                        "Failing load!\n", DRIVER_NAME);
1678                 ret = -ENOMEM;
1679                 goto no_srp_cache;
1680         }
1681
1682         /* Derive version string. */
1683         strcpy(qla4xxx_version_str, QLA4XXX_DRIVER_VERSION);
1684         if (ql4xextended_error_logging)
1685                 strcat(qla4xxx_version_str, "-debug");
1686
1687         qla4xxx_scsi_transport =
1688                 iscsi_register_transport(&qla4xxx_iscsi_transport);
1689         if (!qla4xxx_scsi_transport){
1690                 ret = -ENODEV;
1691                 goto release_srb_cache;
1692         }
1693
1694         ret = pci_register_driver(&qla4xxx_pci_driver);
1695         if (ret)
1696                 goto unregister_transport;
1697
1698         printk(KERN_INFO "QLogic iSCSI HBA Driver\n");
1699         return 0;
1700
1701 unregister_transport:
1702         iscsi_unregister_transport(&qla4xxx_iscsi_transport);
1703 release_srb_cache:
1704         kmem_cache_destroy(srb_cachep);
1705 no_srp_cache:
1706         return ret;
1707 }
1708
1709 static void __exit qla4xxx_module_exit(void)
1710 {
1711         ql4_mod_unload = 1;
1712         pci_unregister_driver(&qla4xxx_pci_driver);
1713         iscsi_unregister_transport(&qla4xxx_iscsi_transport);
1714         kmem_cache_destroy(srb_cachep);
1715 }
1716
1717 module_init(qla4xxx_module_init);
1718 module_exit(qla4xxx_module_exit);
1719
1720 MODULE_AUTHOR("QLogic Corporation");
1721 MODULE_DESCRIPTION("QLogic iSCSI HBA Driver");
1722 MODULE_LICENSE("GPL");
1723 MODULE_VERSION(QLA4XXX_DRIVER_VERSION);