drivers/scsi/qla4xxx/ql4_isr.c

   1 /*
   2  * QLogic iSCSI HBA Driver
   3  * Copyright (c)  2003-2010 QLogic Corporation
   4  *
   5  * See LICENSE.qla4xxx for copyright and licensing details.
   6  */
   7
   8 #include "ql4_def.h"
   9 #include "ql4_glbl.h"
  10 #include "ql4_dbg.h"
  11 #include "ql4_inline.h"
  12
  13 /**
  14  * qla4xxx_copy_sense - copy sense data into cmd sense buffer
  15  * @ha: Pointer to host adapter structure.
  16  * @sts_entry: Pointer to status entry structure.
  17  * @srb: Pointer to srb structure.
  18  **/
  19 static void qla4xxx_copy_sense(struct scsi_qla_host *ha,
  20                                struct status_entry *sts_entry,
  21                                struct srb *srb)
  22 {
  23         struct scsi_cmnd *cmd = srb->cmd;
  24         uint16_t sense_len;
  25
  26         memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
  27         sense_len = le16_to_cpu(sts_entry->senseDataByteCnt);
  28         if (sense_len == 0) {
  29                 DEBUG2(ql4_printk(KERN_INFO, ha, "scsi%ld:%d:%d:%d: %s:"
  30                                   " sense len 0\n", ha->host_no,
  31                                   cmd->device->channel, cmd->device->id,
  32                                   cmd->device->lun, __func__));
  33                 ha->status_srb = NULL;
  34                 return;
  35         }
  36         /* Save total available sense length,
  37          * not to exceed cmd's sense buffer size */
  38         sense_len = min_t(uint16_t, sense_len, SCSI_SENSE_BUFFERSIZE);
  39         srb->req_sense_ptr = cmd->sense_buffer;
  40         srb->req_sense_len = sense_len;
  41
  42         /* Copy sense from sts_entry pkt */
  43         sense_len = min_t(uint16_t, sense_len, IOCB_MAX_SENSEDATA_LEN);
  44         memcpy(cmd->sense_buffer, sts_entry->senseData, sense_len);
  45
  46         DEBUG2(printk(KERN_INFO "scsi%ld:%d:%d:%d: %s: sense key = %x, "
  47                 "ASL= %02x, ASC/ASCQ = %02x/%02x\n", ha->host_no,
  48                 cmd->device->channel, cmd->device->id,
  49                 cmd->device->lun, __func__,
  50                 sts_entry->senseData[2] & 0x0f,
  51                 sts_entry->senseData[7],
  52                 sts_entry->senseData[12],
  53                 sts_entry->senseData[13]));
  54
  55         DEBUG5(qla4xxx_dump_buffer(cmd->sense_buffer, sense_len));
  56         srb->flags |= SRB_GOT_SENSE;
  57
  58         /* Update srb, in case a sts_cont pkt follows */
  59         srb->req_sense_ptr += sense_len;
  60         srb->req_sense_len -= sense_len;
  61         if (srb->req_sense_len != 0)
  62                 ha->status_srb = srb;
  63         else
  64                 ha->status_srb = NULL;
  65 }
  66
  67 /**
  68  * qla4xxx_status_cont_entry - Process a Status Continuations entry.
  69  * @ha: SCSI driver HA context
  70  * @sts_cont: Entry pointer
  71  *
  72  * Extended sense data.
  73  */
  74 static void
  75 qla4xxx_status_cont_entry(struct scsi_qla_host *ha,
  76                           struct status_cont_entry *sts_cont)
  77 {
  78         struct srb *srb = ha->status_srb;
  79         struct scsi_cmnd *cmd;
  80         uint16_t sense_len;
  81
  82         if (srb == NULL)
  83                 return;
  84
  85         cmd = srb->cmd;
  86         if (cmd == NULL) {
  87                 DEBUG2(printk(KERN_INFO "scsi%ld: %s: Cmd already returned "
  88                         "back to OS srb=%p srb->state:%d\n", ha->host_no,
  89                         __func__, srb, srb->state));
  90                 ha->status_srb = NULL;
  91                 return;
  92         }
  93
  94         /* Copy sense data. */
  95         sense_len = min_t(uint16_t, srb->req_sense_len,
  96                           IOCB_MAX_EXT_SENSEDATA_LEN);
  97         memcpy(srb->req_sense_ptr, sts_cont->ext_sense_data, sense_len);
  98         DEBUG5(qla4xxx_dump_buffer(srb->req_sense_ptr, sense_len));
  99
 100         srb->req_sense_ptr += sense_len;
 101         srb->req_sense_len -= sense_len;
 102
 103         /* Place command on done queue. */
 104         if (srb->req_sense_len == 0) {
 105                 kref_put(&srb->srb_ref, qla4xxx_srb_compl);
 106                 ha->status_srb = NULL;
 107         }
 108 }
 109
 110 /**
 111  * qla4xxx_status_entry - processes status IOCBs
 112  * @ha: Pointer to host adapter structure.
 113  * @sts_entry: Pointer to status entry structure.
 114  **/
 115 static void qla4xxx_status_entry(struct scsi_qla_host *ha,
 116                                  struct status_entry *sts_entry)
 117 {
 118         uint8_t scsi_status;
 119         struct scsi_cmnd *cmd;
 120         struct srb *srb;
 121         struct ddb_entry *ddb_entry;
 122         uint32_t residual;
 123
 124         srb = qla4xxx_del_from_active_array(ha, le32_to_cpu(sts_entry->handle));
 125         if (!srb) {
 126                 ql4_printk(KERN_WARNING, ha, "%s invalid status entry: "
 127                            "handle=0x%0x, srb=%p\n", __func__,
 128                            sts_entry->handle, srb);
 129                 if (is_qla8022(ha))
 130                         set_bit(DPC_RESET_HA_FW_CONTEXT, &ha->dpc_flags);
 131                 else
 132                         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 133                 return;
 134         }
 135
 136         cmd = srb->cmd;
 137         if (cmd == NULL) {
 138                 DEBUG2(printk("scsi%ld: %s: Command already returned back to "
 139                               "OS pkt->handle=%d srb=%p srb->state:%d\n",
 140                               ha->host_no, __func__, sts_entry->handle,
 141                               srb, srb->state));
 142                 ql4_printk(KERN_WARNING, ha, "Command is NULL:"
 143                     " already returned to OS (srb=%p)\n", srb);
 144                 return;
 145         }
 146
 147         ddb_entry = srb->ddb;
 148         if (ddb_entry == NULL) {
 149                 cmd->result = DID_NO_CONNECT << 16;
 150                 goto status_entry_exit;
 151         }
 152
 153         residual = le32_to_cpu(sts_entry->residualByteCnt);
 154
 155         /* Translate ISP error to a Linux SCSI error. */
 156         scsi_status = sts_entry->scsiStatus;
 157         switch (sts_entry->completionStatus) {
 158         case SCS_COMPLETE:
 159
 160                 if (sts_entry->iscsiFlags & ISCSI_FLAG_RESIDUAL_OVER) {
 161                         cmd->result = DID_ERROR << 16;
 162                         break;
 163                 }
 164
 165                 if (sts_entry->iscsiFlags &ISCSI_FLAG_RESIDUAL_UNDER) {
 166                         scsi_set_resid(cmd, residual);
 167                         if (!scsi_status && ((scsi_bufflen(cmd) - residual) <
 168                                 cmd->underflow)) {
 169
 170                                 cmd->result = DID_ERROR << 16;
 171
 172                                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: "
 173                                         "Mid-layer Data underrun0, "
 174                                         "xferlen = 0x%x, "
 175                                         "residual = 0x%x\n", ha->host_no,
 176                                         cmd->device->channel,
 177                                         cmd->device->id,
 178                                         cmd->device->lun, __func__,
 179                                         scsi_bufflen(cmd), residual));
 180                                 break;
 181                         }
 182                 }
 183
 184                 cmd->result = DID_OK << 16 | scsi_status;
 185
 186                 if (scsi_status != SCSI_CHECK_CONDITION)
 187                         break;
 188
 189                 /* Copy Sense Data into sense buffer. */
 190                 qla4xxx_copy_sense(ha, sts_entry, srb);
 191                 break;
 192
 193         case SCS_INCOMPLETE:
 194                 /* Always set the status to DID_ERROR, since
 195                  * all conditions result in that status anyway */
 196                 cmd->result = DID_ERROR << 16;
 197                 break;
 198
 199         case SCS_RESET_OCCURRED:
 200                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: Device RESET occurred\n",
 201                               ha->host_no, cmd->device->channel,
 202                               cmd->device->id, cmd->device->lun, __func__));
 203
 204                 cmd->result = DID_RESET << 16;
 205                 break;
 206
 207         case SCS_ABORTED:
 208                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: Abort occurred\n",
 209                               ha->host_no, cmd->device->channel,
 210                               cmd->device->id, cmd->device->lun, __func__));
 211
 212                 cmd->result = DID_RESET << 16;
 213                 break;
 214
 215         case SCS_TIMEOUT:
 216                 DEBUG2(printk(KERN_INFO "scsi%ld:%d:%d:%d: Timeout\n",
 217                               ha->host_no, cmd->device->channel,
 218                               cmd->device->id, cmd->device->lun));
 219
 220                 cmd->result = DID_TRANSPORT_DISRUPTED << 16;
 221
 222                 /*
 223                  * Mark device missing so that we won't continue to send
 224                  * I/O to this device.  We should get a ddb state change
 225                  * AEN soon.
 226                  */
 227                 if (iscsi_is_session_online(ddb_entry->sess))
 228                         qla4xxx_mark_device_missing(ddb_entry->sess);
 229                 break;
 230
 231         case SCS_DATA_UNDERRUN:
 232         case SCS_DATA_OVERRUN:
 233                 if ((sts_entry->iscsiFlags & ISCSI_FLAG_RESIDUAL_OVER) ||
 234                      (sts_entry->completionStatus == SCS_DATA_OVERRUN)) {
 235                         DEBUG2(printk("scsi%ld:%d:%d:%d: %s: " "Data overrun\n",
 236                                       ha->host_no,
 237                                       cmd->device->channel, cmd->device->id,
 238                                       cmd->device->lun, __func__));
 239
 240                         cmd->result = DID_ERROR << 16;
 241                         break;
 242                 }
 243
 244                 scsi_set_resid(cmd, residual);
 245
 246                 /*
 247                  * If there is scsi_status, it takes precedense over
 248                  * underflow condition.
 249                  */
 250                 if (scsi_status != 0) {
 251                         cmd->result = DID_OK << 16 | scsi_status;
 252
 253                         if (scsi_status != SCSI_CHECK_CONDITION)
 254                                 break;
 255
 256                         /* Copy Sense Data into sense buffer. */
 257                         qla4xxx_copy_sense(ha, sts_entry, srb);
 258                 } else {
 259                         /*
 260                          * If RISC reports underrun and target does not
 261                          * report it then we must have a lost frame, so
 262                          * tell upper layer to retry it by reporting a
 263                          * bus busy.
 264                          */
 265                         if ((sts_entry->iscsiFlags &
 266                              ISCSI_FLAG_RESIDUAL_UNDER) == 0) {
 267                                 cmd->result = DID_BUS_BUSY << 16;
 268                         } else if ((scsi_bufflen(cmd) - residual) <
 269                                    cmd->underflow) {
 270                                 /*
 271                                  * Handle mid-layer underflow???
 272                                  *
 273                                  * For kernels less than 2.4, the driver must
 274                                  * return an error if an underflow is detected.
 275                                  * For kernels equal-to and above 2.4, the
 276                                  * mid-layer will appearantly handle the
 277                                  * underflow by detecting the residual count --
 278                                  * unfortunately, we do not see where this is
 279                                  * actually being done.  In the interim, we
 280                                  * will return DID_ERROR.
 281                                  */
 282                                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: "
 283                                         "Mid-layer Data underrun1, "
 284                                         "xferlen = 0x%x, "
 285                                         "residual = 0x%x\n", ha->host_no,
 286                                         cmd->device->channel,
 287                                         cmd->device->id,
 288                                         cmd->device->lun, __func__,
 289                                         scsi_bufflen(cmd), residual));
 290
 291                                 cmd->result = DID_ERROR << 16;
 292                         } else {
 293                                 cmd->result = DID_OK << 16;
 294                         }
 295                 }
 296                 break;
 297
 298         case SCS_DEVICE_LOGGED_OUT:
 299         case SCS_DEVICE_UNAVAILABLE:
 300                 DEBUG2(printk(KERN_INFO "scsi%ld:%d:%d:%d: SCS_DEVICE "
 301                     "state: 0x%x\n", ha->host_no,
 302                     cmd->device->channel, cmd->device->id,
 303                     cmd->device->lun, sts_entry->completionStatus));
 304                 /*
 305                  * Mark device missing so that we won't continue to
 306                  * send I/O to this device.  We should get a ddb
 307                  * state change AEN soon.
 308                  */
 309                 if (iscsi_is_session_online(ddb_entry->sess))
 310                         qla4xxx_mark_device_missing(ddb_entry->sess);
 311
 312                 cmd->result = DID_TRANSPORT_DISRUPTED << 16;
 313                 break;
 314
 315         case SCS_QUEUE_FULL:
 316                 /*
 317                  * SCSI Mid-Layer handles device queue full
 318                  */
 319                 cmd->result = DID_OK << 16 | sts_entry->scsiStatus;
 320                 DEBUG2(printk("scsi%ld:%d:%d: %s: QUEUE FULL detected "
 321                               "compl=%02x, scsi=%02x, state=%02x, iFlags=%02x,"
 322                               " iResp=%02x\n", ha->host_no, cmd->device->id,
 323                               cmd->device->lun, __func__,
 324                               sts_entry->completionStatus,
 325                               sts_entry->scsiStatus, sts_entry->state_flags,
 326                               sts_entry->iscsiFlags,
 327                               sts_entry->iscsiResponse));
 328                 break;
 329
 330         default:
 331                 cmd->result = DID_ERROR << 16;
 332                 break;
 333         }
 334
 335 status_entry_exit:
 336
 337         /* complete the request, if not waiting for status_continuation pkt */
 338         srb->cc_stat = sts_entry->completionStatus;
 339         if (ha->status_srb == NULL)
 340                 kref_put(&srb->srb_ref, qla4xxx_srb_compl);
 341 }
 342
 343 /**
 344  * qla4xxx_passthru_status_entry - processes passthru status IOCBs (0x3C)
 345  * @ha: Pointer to host adapter structure.
 346  * @sts_entry: Pointer to status entry structure.
 347  **/
 348 static void qla4xxx_passthru_status_entry(struct scsi_qla_host *ha,
 349                                           struct passthru_status *sts_entry)
 350 {
 351         struct iscsi_task *task;
 352         struct ddb_entry *ddb_entry;
 353         struct ql4_task_data *task_data;
 354         struct iscsi_cls_conn *cls_conn;
 355         struct iscsi_conn *conn;
 356         itt_t itt;
 357         uint32_t fw_ddb_index;
 358
 359         itt = sts_entry->handle;
 360         fw_ddb_index = le32_to_cpu(sts_entry->target);
 361
 362         ddb_entry = qla4xxx_lookup_ddb_by_fw_index(ha, fw_ddb_index);
 363
 364         if (ddb_entry == NULL) {
 365                 ql4_printk(KERN_ERR, ha, "%s: Invalid target index = 0x%x\n",
 366                            __func__, sts_entry->target);
 367                 return;
 368         }
 369
 370         cls_conn = ddb_entry->conn;
 371         conn = cls_conn->dd_data;
 372         spin_lock(&conn->session->lock);
 373         task = iscsi_itt_to_task(conn, itt);
 374         spin_unlock(&conn->session->lock);
 375
 376         if (task == NULL) {
 377                 ql4_printk(KERN_ERR, ha, "%s: Task is NULL\n", __func__);
 378                 return;
 379         }
 380
 381         task_data = task->dd_data;
 382         memcpy(&task_data->sts, sts_entry, sizeof(struct passthru_status));
 383         ha->req_q_count += task_data->iocb_req_cnt;
 384         ha->iocb_cnt -= task_data->iocb_req_cnt;
 385         queue_work(ha->task_wq, &task_data->task_work);
 386 }
 387
 388 static struct mrb *qla4xxx_del_mrb_from_active_array(struct scsi_qla_host *ha,
 389                                                      uint32_t index)
 390 {
 391         struct mrb *mrb = NULL;
 392
 393         /* validate handle and remove from active array */
 394         if (index >= MAX_MRB)
 395                 return mrb;
 396
 397         mrb = ha->active_mrb_array[index];
 398         ha->active_mrb_array[index] = NULL;
 399         if (!mrb)
 400                 return mrb;
 401
 402         /* update counters */
 403         ha->req_q_count += mrb->iocb_cnt;
 404         ha->iocb_cnt -= mrb->iocb_cnt;
 405
 406         return mrb;
 407 }
 408
 409 static void qla4xxx_mbox_status_entry(struct scsi_qla_host *ha,
 410                                       struct mbox_status_iocb *mbox_sts_entry)
 411 {
 412         struct mrb *mrb;
 413         uint32_t status;
 414         uint32_t data_size;
 415
 416         mrb = qla4xxx_del_mrb_from_active_array(ha,
 417                                         le32_to_cpu(mbox_sts_entry->handle));
 418
 419         if (mrb == NULL) {
 420                 ql4_printk(KERN_WARNING, ha, "%s: mrb[%d] is null\n", __func__,
 421                            mbox_sts_entry->handle);
 422                 return;
 423         }
 424
 425         switch (mrb->mbox_cmd) {
 426         case MBOX_CMD_PING:
 427                 DEBUG2(ql4_printk(KERN_INFO, ha, "%s: mbox_cmd = 0x%x, "
 428                                   "mbox_sts[0] = 0x%x, mbox_sts[6] = 0x%x\n",
 429                                   __func__, mrb->mbox_cmd,
 430                                   mbox_sts_entry->out_mbox[0],
 431                                   mbox_sts_entry->out_mbox[6]));
 432
 433                 if (mbox_sts_entry->out_mbox[0] == MBOX_STS_COMMAND_COMPLETE)
 434                         status = ISCSI_PING_SUCCESS;
 435                 else
 436                         status = mbox_sts_entry->out_mbox[6];
 437
 438                 data_size = sizeof(mbox_sts_entry->out_mbox);
 439
 440                 qla4xxx_post_ping_evt_work(ha, status, mrb->pid, data_size,
 441                                         (uint8_t *) mbox_sts_entry->out_mbox);
 442                 break;
 443
 444         default:
 445                 DEBUG2(ql4_printk(KERN_WARNING, ha, "%s: invalid mbox_cmd = "
 446                                   "0x%x\n", __func__, mrb->mbox_cmd));
 447         }
 448
 449         kfree(mrb);
 450         return;
 451 }
 452
 453 /**
 454  * qla4xxx_process_response_queue - process response queue completions
 455  * @ha: Pointer to host adapter structure.
 456  *
 457  * This routine process response queue completions in interrupt context.
 458  * Hardware_lock locked upon entry
 459  **/
 460 void qla4xxx_process_response_queue(struct scsi_qla_host *ha)
 461 {
 462         uint32_t count = 0;
 463         struct srb *srb = NULL;
 464         struct status_entry *sts_entry;
 465
 466         /* Process all responses from response queue */
 467         while ((ha->response_ptr->signature != RESPONSE_PROCESSED)) {
 468                 sts_entry = (struct status_entry *) ha->response_ptr;
 469                 count++;
 470
 471                 /* Advance pointers for next entry */
 472                 if (ha->response_out == (RESPONSE_QUEUE_DEPTH - 1)) {
 473                         ha->response_out = 0;
 474                         ha->response_ptr = ha->response_ring;
 475                 } else {
 476                         ha->response_out++;
 477                         ha->response_ptr++;
 478                 }
 479
 480                 /* process entry */
 481                 switch (sts_entry->hdr.entryType) {
 482                 case ET_STATUS:
 483                         /* Common status */
 484                         qla4xxx_status_entry(ha, sts_entry);
 485                         break;
 486
 487                 case ET_PASSTHRU_STATUS:
 488                         if (sts_entry->hdr.systemDefined == SD_ISCSI_PDU)
 489                                 qla4xxx_passthru_status_entry(ha,
 490                                         (struct passthru_status *)sts_entry);
 491                         else
 492                                 ql4_printk(KERN_ERR, ha,
 493                                            "%s: Invalid status received\n",
 494                                            __func__);
 495
 496                         break;
 497
 498                 case ET_STATUS_CONTINUATION:
 499                         qla4xxx_status_cont_entry(ha,
 500                                 (struct status_cont_entry *) sts_entry);
 501                         break;
 502
 503                 case ET_COMMAND:
 504                         /* ISP device queue is full. Command not
 505                          * accepted by ISP.  Queue command for
 506                          * later */
 507
 508                         srb = qla4xxx_del_from_active_array(ha,
 509                                                     le32_to_cpu(sts_entry->
 510                                                                 handle));
 511                         if (srb == NULL)
 512                                 goto exit_prq_invalid_handle;
 513
 514                         DEBUG2(printk("scsi%ld: %s: FW device queue full, "
 515                                       "srb %p\n", ha->host_no, __func__, srb));
 516
 517                         /* ETRY normally by sending it back with
 518                          * DID_BUS_BUSY */
 519                         srb->cmd->result = DID_BUS_BUSY << 16;
 520                         kref_put(&srb->srb_ref, qla4xxx_srb_compl);
 521                         break;
 522
 523                 case ET_CONTINUE:
 524                         /* Just throw away the continuation entries */
 525                         DEBUG2(printk("scsi%ld: %s: Continuation entry - "
 526                                       "ignoring\n", ha->host_no, __func__));
 527                         break;
 528
 529                 case ET_MBOX_STATUS:
 530                         DEBUG2(ql4_printk(KERN_INFO, ha,
 531                                           "%s: mbox status IOCB\n", __func__));
 532                         qla4xxx_mbox_status_entry(ha,
 533                                         (struct mbox_status_iocb *)sts_entry);
 534                         break;
 535
 536                 default:
 537                         /*
 538                          * Invalid entry in response queue, reset RISC
 539                          * firmware.
 540                          */
 541                         DEBUG2(printk("scsi%ld: %s: Invalid entry %x in "
 542                                       "response queue \n", ha->host_no,
 543                                       __func__,
 544                                       sts_entry->hdr.entryType));
 545                         goto exit_prq_error;
 546                 }
 547                 ((struct response *)sts_entry)->signature = RESPONSE_PROCESSED;
 548                 wmb();
 549         }
 550
 551         /*
 552          * Tell ISP we're done with response(s). This also clears the interrupt.
 553          */
 554         ha->isp_ops->complete_iocb(ha);
 555
 556         return;
 557
 558 exit_prq_invalid_handle:
 559         DEBUG2(printk("scsi%ld: %s: Invalid handle(srb)=%p type=%x IOCS=%x\n",
 560                       ha->host_no, __func__, srb, sts_entry->hdr.entryType,
 561                       sts_entry->completionStatus));
 562
 563 exit_prq_error:
 564         ha->isp_ops->complete_iocb(ha);
 565         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 566 }
 567
 568 /**
 569  * qla4xxx_isr_decode_mailbox - decodes mailbox status
 570  * @ha: Pointer to host adapter structure.
 571  * @mailbox_status: Mailbox status.
 572  *
 573  * This routine decodes the mailbox status during the ISR.
 574  * Hardware_lock locked upon entry. runs in interrupt context.
 575  **/
 576 static void qla4xxx_isr_decode_mailbox(struct scsi_qla_host * ha,
 577                                        uint32_t mbox_status)
 578 {
 579         int i;
 580         uint32_t mbox_sts[MBOX_AEN_REG_COUNT];
 581
 582         if ((mbox_status == MBOX_STS_BUSY) ||
 583             (mbox_status == MBOX_STS_INTERMEDIATE_COMPLETION) ||
 584             (mbox_status >> 12 == MBOX_COMPLETION_STATUS)) {
 585                 ha->mbox_status[0] = mbox_status;
 586
 587                 if (test_bit(AF_MBOX_COMMAND, &ha->flags)) {
 588                         /*
 589                          * Copy all mailbox registers to a temporary
 590                          * location and set mailbox command done flag
 591                          */
 592                         for (i = 0; i < ha->mbox_status_count; i++)
 593                                 ha->mbox_status[i] = is_qla8022(ha)
 594                                     ? readl(&ha->qla4_8xxx_reg->mailbox_out[i])
 595                                     : readl(&ha->reg->mailbox[i]);
 596
 597                         set_bit(AF_MBOX_COMMAND_DONE, &ha->flags);
 598
 599                         if (test_bit(AF_MBOX_COMMAND_NOPOLL, &ha->flags))
 600                                 complete(&ha->mbx_intr_comp);
 601                 }
 602         } else if (mbox_status >> 12 == MBOX_ASYNC_EVENT_STATUS) {
 603                 for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
 604                         mbox_sts[i] = is_qla8022(ha)
 605                             ? readl(&ha->qla4_8xxx_reg->mailbox_out[i])
 606                             : readl(&ha->reg->mailbox[i]);
 607
 608                 /* Immediately process the AENs that don't require much work.
 609                  * Only queue the database_changed AENs */
 610                 if (ha->aen_log.count < MAX_AEN_ENTRIES) {
 611                         for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
 612                                 ha->aen_log.entry[ha->aen_log.count].mbox_sts[i] =
 613                                     mbox_sts[i];
 614                         ha->aen_log.count++;
 615                 }
 616                 switch (mbox_status) {
 617                 case MBOX_ASTS_SYSTEM_ERROR:
 618                         /* Log Mailbox registers */
 619                         ql4_printk(KERN_INFO, ha, "%s: System Err\n", __func__);
 620                         qla4xxx_dump_registers(ha);
 621
 622                         if (ql4xdontresethba) {
 623                                 DEBUG2(printk("scsi%ld: %s:Don't Reset HBA\n",
 624                                     ha->host_no, __func__));
 625                         } else {
 626                                 set_bit(AF_GET_CRASH_RECORD, &ha->flags);
 627                                 set_bit(DPC_RESET_HA, &ha->dpc_flags);
 628                         }
 629                         break;
 630
 631                 case MBOX_ASTS_REQUEST_TRANSFER_ERROR:
 632                 case MBOX_ASTS_RESPONSE_TRANSFER_ERROR:
 633                 case MBOX_ASTS_NVRAM_INVALID:
 634                 case MBOX_ASTS_IP_ADDRESS_CHANGED:
 635                 case MBOX_ASTS_DHCP_LEASE_EXPIRED:
 636                         DEBUG2(printk("scsi%ld: AEN %04x, ERROR Status, "
 637                                       "Reset HA\n", ha->host_no, mbox_status));
 638                         if (is_qla8022(ha))
 639                                 set_bit(DPC_RESET_HA_FW_CONTEXT,
 640                                         &ha->dpc_flags);
 641                         else
 642                                 set_bit(DPC_RESET_HA, &ha->dpc_flags);
 643                         break;
 644
 645                 case MBOX_ASTS_LINK_UP:
 646                         set_bit(AF_LINK_UP, &ha->flags);
 647                         if (test_bit(AF_INIT_DONE, &ha->flags))
 648                                 set_bit(DPC_LINK_CHANGED, &ha->dpc_flags);
 649
 650                         ql4_printk(KERN_INFO, ha, "%s: LINK UP\n", __func__);
 651                         qla4xxx_post_aen_work(ha, ISCSI_EVENT_LINKUP,
 652                                               sizeof(mbox_sts),
 653                                               (uint8_t *) mbox_sts);
 654                         break;
 655
 656                 case MBOX_ASTS_LINK_DOWN:
 657                         clear_bit(AF_LINK_UP, &ha->flags);
 658                         if (test_bit(AF_INIT_DONE, &ha->flags))
 659                                 set_bit(DPC_LINK_CHANGED, &ha->dpc_flags);
 660
 661                         ql4_printk(KERN_INFO, ha, "%s: LINK DOWN\n", __func__);
 662                         qla4xxx_post_aen_work(ha, ISCSI_EVENT_LINKDOWN,
 663                                               sizeof(mbox_sts),
 664                                               (uint8_t *) mbox_sts);
 665                         break;
 666
 667                 case MBOX_ASTS_HEARTBEAT:
 668                         ha->seconds_since_last_heartbeat = 0;
 669                         break;
 670
 671                 case MBOX_ASTS_DHCP_LEASE_ACQUIRED:
 672                         DEBUG2(printk("scsi%ld: AEN %04x DHCP LEASE "
 673                                       "ACQUIRED\n", ha->host_no, mbox_status));
 674                         set_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags);
 675                         break;
 676
 677                 case MBOX_ASTS_PROTOCOL_STATISTIC_ALARM:
 678                 case MBOX_ASTS_SCSI_COMMAND_PDU_REJECTED: /* Target
 679                                                            * mode
 680                                                            * only */
 681                 case MBOX_ASTS_UNSOLICITED_PDU_RECEIVED:  /* Connection mode */
 682                 case MBOX_ASTS_IPSEC_SYSTEM_FATAL_ERROR:
 683                 case MBOX_ASTS_SUBNET_STATE_CHANGE:
 684                 case MBOX_ASTS_DUPLICATE_IP:
 685                         /* No action */
 686                         DEBUG2(printk("scsi%ld: AEN %04x\n", ha->host_no,
 687                                       mbox_status));
 688                         break;
 689
 690                 case MBOX_ASTS_IP_ADDR_STATE_CHANGED:
 691                         printk("scsi%ld: AEN %04x, mbox_sts[2]=%04x, "
 692                             "mbox_sts[3]=%04x\n", ha->host_no, mbox_sts[0],
 693                             mbox_sts[2], mbox_sts[3]);
 694
 695                         /* mbox_sts[2] = Old ACB state
 696                          * mbox_sts[3] = new ACB state */
 697                         if ((mbox_sts[3] == ACB_STATE_VALID) &&
 698                             ((mbox_sts[2] == ACB_STATE_TENTATIVE) ||
 699                             (mbox_sts[2] == ACB_STATE_ACQUIRING)))
 700                                 set_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags);
 701                         else if ((mbox_sts[3] == ACB_STATE_ACQUIRING) &&
 702                                  (mbox_sts[2] == ACB_STATE_VALID)) {
 703                                 if (is_qla8022(ha))
 704                                         set_bit(DPC_RESET_HA_FW_CONTEXT,
 705                                                 &ha->dpc_flags);
 706                                 else
 707                                         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 708                         } else if ((mbox_sts[3] == ACB_STATE_UNCONFIGURED))
 709                                 complete(&ha->disable_acb_comp);
 710                         break;
 711
 712                 case MBOX_ASTS_MAC_ADDRESS_CHANGED:
 713                 case MBOX_ASTS_DNS:
 714                         /* No action */
 715                         DEBUG2(printk(KERN_INFO "scsi%ld: AEN %04x, "
 716                                       "mbox_sts[1]=%04x, mbox_sts[2]=%04x\n",
 717                                       ha->host_no, mbox_sts[0],
 718                                       mbox_sts[1], mbox_sts[2]));
 719                         break;
 720
 721                 case MBOX_ASTS_SELF_TEST_FAILED:
 722                 case MBOX_ASTS_LOGIN_FAILED:
 723                         /* No action */
 724                         DEBUG2(printk("scsi%ld: AEN %04x, mbox_sts[1]=%04x, "
 725                                       "mbox_sts[2]=%04x, mbox_sts[3]=%04x\n",
 726                                       ha->host_no, mbox_sts[0], mbox_sts[1],
 727                                       mbox_sts[2], mbox_sts[3]));
 728                         break;
 729
 730                 case MBOX_ASTS_DATABASE_CHANGED:
 731                         /* Queue AEN information and process it in the DPC
 732                          * routine */
 733                         if (ha->aen_q_count > 0) {
 734
 735                                 /* decrement available counter */
 736                                 ha->aen_q_count--;
 737
 738                                 for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
 739                                         ha->aen_q[ha->aen_in].mbox_sts[i] =
 740                                             mbox_sts[i];
 741
 742                                 /* print debug message */
 743                                 DEBUG2(printk("scsi%ld: AEN[%d] %04x queued "
 744                                               "mb1:0x%x mb2:0x%x mb3:0x%x "
 745                                               "mb4:0x%x mb5:0x%x\n",
 746                                               ha->host_no, ha->aen_in,
 747                                               mbox_sts[0], mbox_sts[1],
 748                                               mbox_sts[2], mbox_sts[3],
 749                                               mbox_sts[4], mbox_sts[5]));
 750
 751                                 /* advance pointer */
 752                                 ha->aen_in++;
 753                                 if (ha->aen_in == MAX_AEN_ENTRIES)
 754                                         ha->aen_in = 0;
 755
 756                                 /* The DPC routine will process the aen */
 757                                 set_bit(DPC_AEN, &ha->dpc_flags);
 758                         } else {
 759                                 DEBUG2(printk("scsi%ld: %s: aen %04x, queue "
 760                                               "overflowed!  AEN LOST!!\n",
 761                                               ha->host_no, __func__,
 762                                               mbox_sts[0]));
 763
 764                                 DEBUG2(printk("scsi%ld: DUMP AEN QUEUE\n",
 765                                               ha->host_no));
 766
 767                                 for (i = 0; i < MAX_AEN_ENTRIES; i++) {
 768                                         DEBUG2(printk("AEN[%d] %04x %04x %04x "
 769                                                       "%04x\n", i, mbox_sts[0],
 770                                                       mbox_sts[1], mbox_sts[2],
 771                                                       mbox_sts[3]));
 772                                 }
 773                         }
 774                         break;
 775
 776                 case MBOX_ASTS_TXSCVR_INSERTED:
 777                         DEBUG2(printk(KERN_WARNING
 778                             "scsi%ld: AEN %04x Transceiver"
 779                             " inserted\n",  ha->host_no, mbox_sts[0]));
 780                         break;
 781
 782                 case MBOX_ASTS_TXSCVR_REMOVED:
 783                         DEBUG2(printk(KERN_WARNING
 784                             "scsi%ld: AEN %04x Transceiver"
 785                             " removed\n",  ha->host_no, mbox_sts[0]));
 786                         break;
 787
 788                 default:
 789                         DEBUG2(printk(KERN_WARNING
 790                                       "scsi%ld: AEN %04x UNKNOWN\n",
 791                                       ha->host_no, mbox_sts[0]));
 792                         break;
 793                 }
 794         } else {
 795                 DEBUG2(printk("scsi%ld: Unknown mailbox status %08X\n",
 796                               ha->host_no, mbox_status));
 797
 798                 ha->mbox_status[0] = mbox_status;
 799         }
 800 }
 801
 802 /**
 803  * qla4_8xxx_interrupt_service_routine - isr
 804  * @ha: pointer to host adapter structure.
 805  *
 806  * This is the main interrupt service routine.
 807  * hardware_lock locked upon entry. runs in interrupt context.
 808  **/
 809 void qla4_8xxx_interrupt_service_routine(struct scsi_qla_host *ha,
 810     uint32_t intr_status)
 811 {
 812         /* Process response queue interrupt. */
 813         if (intr_status & HSRX_RISC_IOCB_INT)
 814                 qla4xxx_process_response_queue(ha);
 815
 816         /* Process mailbox/asynch event interrupt.*/
 817         if (intr_status & HSRX_RISC_MB_INT)
 818                 qla4xxx_isr_decode_mailbox(ha,
 819                     readl(&ha->qla4_8xxx_reg->mailbox_out[0]));
 820
 821         /* clear the interrupt */
 822         writel(0, &ha->qla4_8xxx_reg->host_int);
 823         readl(&ha->qla4_8xxx_reg->host_int);
 824 }
 825
 826 /**
 827  * qla4xxx_interrupt_service_routine - isr
 828  * @ha: pointer to host adapter structure.
 829  *
 830  * This is the main interrupt service routine.
 831  * hardware_lock locked upon entry. runs in interrupt context.
 832  **/
 833 void qla4xxx_interrupt_service_routine(struct scsi_qla_host * ha,
 834                                        uint32_t intr_status)
 835 {
 836         /* Process response queue interrupt. */
 837         if (intr_status & CSR_SCSI_COMPLETION_INTR)
 838                 qla4xxx_process_response_queue(ha);
 839
 840         /* Process mailbox/asynch event  interrupt.*/
 841         if (intr_status & CSR_SCSI_PROCESSOR_INTR) {
 842                 qla4xxx_isr_decode_mailbox(ha,
 843                                            readl(&ha->reg->mailbox[0]));
 844
 845                 /* Clear Mailbox Interrupt */
 846                 writel(set_rmask(CSR_SCSI_PROCESSOR_INTR),
 847                        &ha->reg->ctrl_status);
 848                 readl(&ha->reg->ctrl_status);
 849         }
 850 }
 851
 852 /**
 853  * qla4_8xxx_spurious_interrupt - processes spurious interrupt
 854  * @ha: pointer to host adapter structure.
 855  * @reqs_count: .
 856  *
 857  **/
 858 static void qla4_8xxx_spurious_interrupt(struct scsi_qla_host *ha,
 859     uint8_t reqs_count)
 860 {
 861         if (reqs_count)
 862                 return;
 863
 864         DEBUG2(ql4_printk(KERN_INFO, ha, "Spurious Interrupt\n"));
 865         if (is_qla8022(ha)) {
 866                 writel(0, &ha->qla4_8xxx_reg->host_int);
 867                 if (test_bit(AF_INTx_ENABLED, &ha->flags))
 868                         qla4_8xxx_wr_32(ha, ha->nx_legacy_intr.tgt_mask_reg,
 869                             0xfbff);
 870         }
 871         ha->spurious_int_count++;
 872 }
 873
 874 /**
 875  * qla4xxx_intr_handler - hardware interrupt handler.
 876  * @irq: Unused
 877  * @dev_id: Pointer to host adapter structure
 878  **/
 879 irqreturn_t qla4xxx_intr_handler(int irq, void *dev_id)
 880 {
 881         struct scsi_qla_host *ha;
 882         uint32_t intr_status;
 883         unsigned long flags = 0;
 884         uint8_t reqs_count = 0;
 885
 886         ha = (struct scsi_qla_host *) dev_id;
 887         if (!ha) {
 888                 DEBUG2(printk(KERN_INFO
 889                               "qla4xxx: Interrupt with NULL host ptr\n"));
 890                 return IRQ_NONE;
 891         }
 892
 893         spin_lock_irqsave(&ha->hardware_lock, flags);
 894
 895         ha->isr_count++;
 896         /*
 897          * Repeatedly service interrupts up to a maximum of
 898          * MAX_REQS_SERVICED_PER_INTR
 899          */
 900         while (1) {
 901                 /*
 902                  * Read interrupt status
 903                  */
 904                 if (ha->isp_ops->rd_shdw_rsp_q_in(ha) !=
 905                     ha->response_out)
 906                         intr_status = CSR_SCSI_COMPLETION_INTR;
 907                 else
 908                         intr_status = readl(&ha->reg->ctrl_status);
 909
 910                 if ((intr_status &
 911                     (CSR_SCSI_RESET_INTR|CSR_FATAL_ERROR|INTR_PENDING)) == 0) {
 912                         if (reqs_count == 0)
 913                                 ha->spurious_int_count++;
 914                         break;
 915                 }
 916
 917                 if (intr_status & CSR_FATAL_ERROR) {
 918                         DEBUG2(printk(KERN_INFO "scsi%ld: Fatal Error, "
 919                                       "Status 0x%04x\n", ha->host_no,
 920                                       readl(isp_port_error_status (ha))));
 921
 922                         /* Issue Soft Reset to clear this error condition.
 923                          * This will prevent the RISC from repeatedly
 924                          * interrupting the driver; thus, allowing the DPC to
 925                          * get scheduled to continue error recovery.
 926                          * NOTE: Disabling RISC interrupts does not work in
 927                          * this case, as CSR_FATAL_ERROR overrides
 928                          * CSR_SCSI_INTR_ENABLE */
 929                         if ((readl(&ha->reg->ctrl_status) &
 930                              CSR_SCSI_RESET_INTR) == 0) {
 931                                 writel(set_rmask(CSR_SOFT_RESET),
 932                                        &ha->reg->ctrl_status);
 933                                 readl(&ha->reg->ctrl_status);
 934                         }
 935
 936                         writel(set_rmask(CSR_FATAL_ERROR),
 937                                &ha->reg->ctrl_status);
 938                         readl(&ha->reg->ctrl_status);
 939
 940                         __qla4xxx_disable_intrs(ha);
 941
 942                         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 943
 944                         break;
 945                 } else if (intr_status & CSR_SCSI_RESET_INTR) {
 946                         clear_bit(AF_ONLINE, &ha->flags);
 947                         __qla4xxx_disable_intrs(ha);
 948
 949                         writel(set_rmask(CSR_SCSI_RESET_INTR),
 950                                &ha->reg->ctrl_status);
 951                         readl(&ha->reg->ctrl_status);
 952
 953                         if (!test_bit(AF_HA_REMOVAL, &ha->flags))
 954                                 set_bit(DPC_RESET_HA_INTR, &ha->dpc_flags);
 955
 956                         break;
 957                 } else if (intr_status & INTR_PENDING) {
 958                         ha->isp_ops->interrupt_service_routine(ha, intr_status);
 959                         ha->total_io_count++;
 960                         if (++reqs_count == MAX_REQS_SERVICED_PER_INTR)
 961                                 break;
 962                 }
 963         }
 964
 965         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 966
 967         return IRQ_HANDLED;
 968 }
 969
 970 /**
 971  * qla4_8xxx_intr_handler - hardware interrupt handler.
 972  * @irq: Unused
 973  * @dev_id: Pointer to host adapter structure
 974  **/
 975 irqreturn_t qla4_8xxx_intr_handler(int irq, void *dev_id)
 976 {
 977         struct scsi_qla_host *ha = dev_id;
 978         uint32_t intr_status;
 979         uint32_t status;
 980         unsigned long flags = 0;
 981         uint8_t reqs_count = 0;
 982
 983         if (unlikely(pci_channel_offline(ha->pdev)))
 984                 return IRQ_HANDLED;
 985
 986         ha->isr_count++;
 987         status = qla4_8xxx_rd_32(ha, ISR_INT_VECTOR);
 988         if (!(status & ha->nx_legacy_intr.int_vec_bit))
 989                 return IRQ_NONE;
 990
 991         status = qla4_8xxx_rd_32(ha, ISR_INT_STATE_REG);
 992         if (!ISR_IS_LEGACY_INTR_TRIGGERED(status)) {
 993                 DEBUG2(ql4_printk(KERN_INFO, ha,
 994                     "%s legacy Int not triggered\n", __func__));
 995                 return IRQ_NONE;
 996         }
 997
 998         /* clear the interrupt */
 999         qla4_8xxx_wr_32(ha, ha->nx_legacy_intr.tgt_status_reg, 0xffffffff);
1000
1001         /* read twice to ensure write is flushed */
1002         qla4_8xxx_rd_32(ha, ISR_INT_VECTOR);
1003         qla4_8xxx_rd_32(ha, ISR_INT_VECTOR);
1004
1005         spin_lock_irqsave(&ha->hardware_lock, flags);
1006         while (1) {
1007                 if (!(readl(&ha->qla4_8xxx_reg->host_int) &
1008                     ISRX_82XX_RISC_INT)) {
1009                         qla4_8xxx_spurious_interrupt(ha, reqs_count);
1010                         break;
1011                 }
1012                 intr_status =  readl(&ha->qla4_8xxx_reg->host_status);
1013                 if ((intr_status &
1014                     (HSRX_RISC_MB_INT | HSRX_RISC_IOCB_INT)) == 0)  {
1015                         qla4_8xxx_spurious_interrupt(ha, reqs_count);
1016                         break;
1017                 }
1018
1019                 ha->isp_ops->interrupt_service_routine(ha, intr_status);
1020
1021                 /* Enable Interrupt */
1022                 qla4_8xxx_wr_32(ha, ha->nx_legacy_intr.tgt_mask_reg, 0xfbff);
1023
1024                 if (++reqs_count == MAX_REQS_SERVICED_PER_INTR)
1025                         break;
1026         }
1027
1028         spin_unlock_irqrestore(&ha->hardware_lock, flags);
1029         return IRQ_HANDLED;
1030 }
1031
1032 irqreturn_t
1033 qla4_8xxx_msi_handler(int irq, void *dev_id)
1034 {
1035         struct scsi_qla_host *ha;
1036
1037         ha = (struct scsi_qla_host *) dev_id;
1038         if (!ha) {
1039                 DEBUG2(printk(KERN_INFO
1040                     "qla4xxx: MSIX: Interrupt with NULL host ptr\n"));
1041                 return IRQ_NONE;
1042         }
1043
1044         ha->isr_count++;
1045         /* clear the interrupt */
1046         qla4_8xxx_wr_32(ha, ha->nx_legacy_intr.tgt_status_reg, 0xffffffff);
1047
1048         /* read twice to ensure write is flushed */
1049         qla4_8xxx_rd_32(ha, ISR_INT_VECTOR);
1050         qla4_8xxx_rd_32(ha, ISR_INT_VECTOR);
1051
1052         return qla4_8xxx_default_intr_handler(irq, dev_id);
1053 }
1054
1055 /**
1056  * qla4_8xxx_default_intr_handler - hardware interrupt handler.
1057  * @irq: Unused
1058  * @dev_id: Pointer to host adapter structure
1059  *
1060  * This interrupt handler is called directly for MSI-X, and
1061  * called indirectly for MSI.
1062  **/
1063 irqreturn_t
1064 qla4_8xxx_default_intr_handler(int irq, void *dev_id)
1065 {
1066         struct scsi_qla_host *ha = dev_id;
1067         unsigned long   flags;
1068         uint32_t intr_status;
1069         uint8_t reqs_count = 0;
1070
1071         spin_lock_irqsave(&ha->hardware_lock, flags);
1072         while (1) {
1073                 if (!(readl(&ha->qla4_8xxx_reg->host_int) &
1074                     ISRX_82XX_RISC_INT)) {
1075                         qla4_8xxx_spurious_interrupt(ha, reqs_count);
1076                         break;
1077                 }
1078
1079                 intr_status =  readl(&ha->qla4_8xxx_reg->host_status);
1080                 if ((intr_status &
1081                     (HSRX_RISC_MB_INT | HSRX_RISC_IOCB_INT)) == 0) {
1082                         qla4_8xxx_spurious_interrupt(ha, reqs_count);
1083                         break;
1084                 }
1085
1086                 ha->isp_ops->interrupt_service_routine(ha, intr_status);
1087
1088                 if (++reqs_count == MAX_REQS_SERVICED_PER_INTR)
1089                         break;
1090         }
1091
1092         ha->isr_count++;
1093         spin_unlock_irqrestore(&ha->hardware_lock, flags);
1094         return IRQ_HANDLED;
1095 }
1096
1097 irqreturn_t
1098 qla4_8xxx_msix_rsp_q(int irq, void *dev_id)
1099 {
1100         struct scsi_qla_host *ha = dev_id;
1101         unsigned long flags;
1102
1103         spin_lock_irqsave(&ha->hardware_lock, flags);
1104         qla4xxx_process_response_queue(ha);
1105         writel(0, &ha->qla4_8xxx_reg->host_int);
1106         spin_unlock_irqrestore(&ha->hardware_lock, flags);
1107
1108         ha->isr_count++;
1109         return IRQ_HANDLED;
1110 }
1111
1112 /**
1113  * qla4xxx_process_aen - processes AENs generated by firmware
1114  * @ha: pointer to host adapter structure.
1115  * @process_aen: type of AENs to process
1116  *
1117  * Processes specific types of Asynchronous Events generated by firmware.
1118  * The type of AENs to process is specified by process_aen and can be
1119  *      PROCESS_ALL_AENS         0
1120  *      FLUSH_DDB_CHANGED_AENS   1
1121  *      RELOGIN_DDB_CHANGED_AENS 2
1122  **/
1123 void qla4xxx_process_aen(struct scsi_qla_host * ha, uint8_t process_aen)
1124 {
1125         uint32_t mbox_sts[MBOX_AEN_REG_COUNT];
1126         struct aen *aen;
1127         int i;
1128         unsigned long flags;
1129
1130         spin_lock_irqsave(&ha->hardware_lock, flags);
1131         while (ha->aen_out != ha->aen_in) {
1132                 aen = &ha->aen_q[ha->aen_out];
1133                 /* copy aen information to local structure */
1134                 for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
1135                         mbox_sts[i] = aen->mbox_sts[i];
1136
1137                 ha->aen_q_count++;
1138                 ha->aen_out++;
1139
1140                 if (ha->aen_out == MAX_AEN_ENTRIES)
1141                         ha->aen_out = 0;
1142
1143                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
1144
1145                 DEBUG2(printk("qla4xxx(%ld): AEN[%d]=0x%08x, mbx1=0x%08x mbx2=0x%08x"
1146                         " mbx3=0x%08x mbx4=0x%08x\n", ha->host_no,
1147                         (ha->aen_out ? (ha->aen_out-1): (MAX_AEN_ENTRIES-1)),
1148                         mbox_sts[0], mbox_sts[1], mbox_sts[2],
1149                         mbox_sts[3], mbox_sts[4]));
1150
1151                 switch (mbox_sts[0]) {
1152                 case MBOX_ASTS_DATABASE_CHANGED:
1153                         switch (process_aen) {
1154                         case FLUSH_DDB_CHANGED_AENS:
1155                                 DEBUG2(printk("scsi%ld: AEN[%d] %04x, index "
1156                                               "[%d] state=%04x FLUSHED!\n",
1157                                               ha->host_no, ha->aen_out,
1158                                               mbox_sts[0], mbox_sts[2],
1159                                               mbox_sts[3]));
1160                                 break;
1161                         case PROCESS_ALL_AENS:
1162                         default:
1163                                 /* Specific device. */
1164                                 if (mbox_sts[1] == 1)
1165                                         qla4xxx_process_ddb_changed(ha,
1166                                                 mbox_sts[2], mbox_sts[3],
1167                                                 mbox_sts[4]);
1168                                 break;
1169                         }
1170                 }
1171                 spin_lock_irqsave(&ha->hardware_lock, flags);
1172         }
1173         spin_unlock_irqrestore(&ha->hardware_lock, flags);
1174 }
1175
1176 int qla4xxx_request_irqs(struct scsi_qla_host *ha)
1177 {
1178         int ret;
1179
1180         if (!is_qla8022(ha))
1181                 goto try_intx;
1182
1183         if (ql4xenablemsix == 2)
1184                 goto try_msi;
1185
1186         if (ql4xenablemsix == 0 || ql4xenablemsix != 1)
1187                 goto try_intx;
1188
1189         /* Trying MSI-X */
1190         ret = qla4_8xxx_enable_msix(ha);
1191         if (!ret) {
1192                 DEBUG2(ql4_printk(KERN_INFO, ha,
1193                     "MSI-X: Enabled (0x%X).\n", ha->revision_id));
1194                 goto irq_attached;
1195         }
1196
1197         ql4_printk(KERN_WARNING, ha,
1198             "MSI-X: Falling back-to MSI mode -- %d.\n", ret);
1199
1200 try_msi:
1201         /* Trying MSI */
1202         ret = pci_enable_msi(ha->pdev);
1203         if (!ret) {
1204                 ret = request_irq(ha->pdev->irq, qla4_8xxx_msi_handler,
1205                         0, DRIVER_NAME, ha);
1206                 if (!ret) {
1207                         DEBUG2(ql4_printk(KERN_INFO, ha, "MSI: Enabled.\n"));
1208                         set_bit(AF_MSI_ENABLED, &ha->flags);
1209                         goto irq_attached;
1210                 } else {
1211                         ql4_printk(KERN_WARNING, ha,
1212                             "MSI: Failed to reserve interrupt %d "
1213                             "already in use.\n", ha->pdev->irq);
1214                         pci_disable_msi(ha->pdev);
1215                 }
1216         }
1217         ql4_printk(KERN_WARNING, ha,
1218             "MSI: Falling back-to INTx mode -- %d.\n", ret);
1219
1220 try_intx:
1221         /* Trying INTx */
1222         ret = request_irq(ha->pdev->irq, ha->isp_ops->intr_handler,
1223             IRQF_SHARED, DRIVER_NAME, ha);
1224         if (!ret) {
1225                 DEBUG2(ql4_printk(KERN_INFO, ha, "INTx: Enabled.\n"));
1226                 set_bit(AF_INTx_ENABLED, &ha->flags);
1227                 goto irq_attached;
1228
1229         } else {
1230                 ql4_printk(KERN_WARNING, ha,
1231                     "INTx: Failed to reserve interrupt %d already in"
1232                     " use.\n", ha->pdev->irq);
1233                 return ret;
1234         }
1235
1236 irq_attached:
1237         set_bit(AF_IRQ_ATTACHED, &ha->flags);
1238         ha->host->irq = ha->pdev->irq;
1239         ql4_printk(KERN_INFO, ha, "%s: irq %d attached\n",
1240             __func__, ha->pdev->irq);
1241         return ret;
1242 }
1243
1244 void qla4xxx_free_irqs(struct scsi_qla_host *ha)
1245 {
1246         if (test_bit(AF_MSIX_ENABLED, &ha->flags))
1247                 qla4_8xxx_disable_msix(ha);
1248         else if (test_and_clear_bit(AF_MSI_ENABLED, &ha->flags)) {
1249                 free_irq(ha->pdev->irq, ha);
1250                 pci_disable_msi(ha->pdev);
1251         } else if (test_and_clear_bit(AF_INTx_ENABLED, &ha->flags))
1252                 free_irq(ha->pdev->irq, ha);
1253 }