drivers/scsi/qla4xxx/ql4_isr.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
   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                 return;
  30
  31         /* Save total available sense length,
  32          * not to exceed cmd's sense buffer size */
  33         sense_len = min_t(uint16_t, sense_len, SCSI_SENSE_BUFFERSIZE);
  34         srb->req_sense_ptr = cmd->sense_buffer;
  35         srb->req_sense_len = sense_len;
  36
  37         /* Copy sense from sts_entry pkt */
  38         sense_len = min_t(uint16_t, sense_len, IOCB_MAX_SENSEDATA_LEN);
  39         memcpy(cmd->sense_buffer, sts_entry->senseData, sense_len);
  40
  41         DEBUG2(printk(KERN_INFO "scsi%ld:%d:%d:%d: %s: sense key = %x, "
  42                 "ASL= %02x, ASC/ASCQ = %02x/%02x\n", ha->host_no,
  43                 cmd->device->channel, cmd->device->id,
  44                 cmd->device->lun, __func__,
  45                 sts_entry->senseData[2] & 0x0f,
  46                 sts_entry->senseData[7],
  47                 sts_entry->senseData[12],
  48                 sts_entry->senseData[13]));
  49
  50         DEBUG5(qla4xxx_dump_buffer(cmd->sense_buffer, sense_len));
  51         srb->flags |= SRB_GOT_SENSE;
  52
  53         /* Update srb, in case a sts_cont pkt follows */
  54         srb->req_sense_ptr += sense_len;
  55         srb->req_sense_len -= sense_len;
  56         if (srb->req_sense_len != 0)
  57                 ha->status_srb = srb;
  58         else
  59                 ha->status_srb = NULL;
  60 }
  61
  62 /**
  63  * qla4xxx_status_cont_entry - Process a Status Continuations entry.
  64  * @ha: SCSI driver HA context
  65  * @sts_cont: Entry pointer
  66  *
  67  * Extended sense data.
  68  */
  69 static void
  70 qla4xxx_status_cont_entry(struct scsi_qla_host *ha,
  71                           struct status_cont_entry *sts_cont)
  72 {
  73         struct srb *srb = ha->status_srb;
  74         struct scsi_cmnd *cmd;
  75         uint16_t sense_len;
  76
  77         if (srb == NULL)
  78                 return;
  79
  80         cmd = srb->cmd;
  81         if (cmd == NULL) {
  82                 DEBUG2(printk(KERN_INFO "scsi%ld: %s: Cmd already returned "
  83                         "back to OS srb=%p srb->state:%d\n", ha->host_no,
  84                         __func__, srb, srb->state));
  85                 ha->status_srb = NULL;
  86                 return;
  87         }
  88
  89         /* Copy sense data. */
  90         sense_len = min_t(uint16_t, srb->req_sense_len,
  91                           IOCB_MAX_EXT_SENSEDATA_LEN);
  92         memcpy(srb->req_sense_ptr, sts_cont->ext_sense_data, sense_len);
  93         DEBUG5(qla4xxx_dump_buffer(srb->req_sense_ptr, sense_len));
  94
  95         srb->req_sense_ptr += sense_len;
  96         srb->req_sense_len -= sense_len;
  97
  98         /* Place command on done queue. */
  99         if (srb->req_sense_len == 0) {
 100                 kref_put(&srb->srb_ref, qla4xxx_srb_compl);
 101                 ha->status_srb = NULL;
 102         }
 103 }
 104
 105 /**
 106  * qla4xxx_status_entry - processes status IOCBs
 107  * @ha: Pointer to host adapter structure.
 108  * @sts_entry: Pointer to status entry structure.
 109  **/
 110 static void qla4xxx_status_entry(struct scsi_qla_host *ha,
 111                                  struct status_entry *sts_entry)
 112 {
 113         uint8_t scsi_status;
 114         struct scsi_cmnd *cmd;
 115         struct srb *srb;
 116         struct ddb_entry *ddb_entry;
 117         uint32_t residual;
 118
 119         srb = qla4xxx_del_from_active_array(ha, le32_to_cpu(sts_entry->handle));
 120         if (!srb) {
 121                 DEBUG2(printk(KERN_WARNING "scsi%ld: %s: Status Entry invalid "
 122                               "handle 0x%x, sp=%p. This cmd may have already "
 123                               "been completed.\n", ha->host_no, __func__,
 124                               le32_to_cpu(sts_entry->handle), srb));
 125                 ql4_printk(KERN_WARNING, ha, "%s invalid status entry:"
 126                     " handle=0x%0x\n", __func__, sts_entry->handle);
 127                 set_bit(DPC_RESET_HA, &ha->dpc_flags);
 128                 return;
 129         }
 130
 131         cmd = srb->cmd;
 132         if (cmd == NULL) {
 133                 DEBUG2(printk("scsi%ld: %s: Command already returned back to "
 134                               "OS pkt->handle=%d srb=%p srb->state:%d\n",
 135                               ha->host_no, __func__, sts_entry->handle,
 136                               srb, srb->state));
 137                 ql4_printk(KERN_WARNING, ha, "Command is NULL:"
 138                     " already returned to OS (srb=%p)\n", srb);
 139                 return;
 140         }
 141
 142         ddb_entry = srb->ddb;
 143         if (ddb_entry == NULL) {
 144                 cmd->result = DID_NO_CONNECT << 16;
 145                 goto status_entry_exit;
 146         }
 147
 148         residual = le32_to_cpu(sts_entry->residualByteCnt);
 149
 150         /* Translate ISP error to a Linux SCSI error. */
 151         scsi_status = sts_entry->scsiStatus;
 152         switch (sts_entry->completionStatus) {
 153         case SCS_COMPLETE:
 154
 155                 if (sts_entry->iscsiFlags & ISCSI_FLAG_RESIDUAL_OVER) {
 156                         cmd->result = DID_ERROR << 16;
 157                         break;
 158                 }
 159
 160                 if (sts_entry->iscsiFlags &ISCSI_FLAG_RESIDUAL_UNDER) {
 161                         scsi_set_resid(cmd, residual);
 162                         if (!scsi_status && ((scsi_bufflen(cmd) - residual) <
 163                                 cmd->underflow)) {
 164
 165                                 cmd->result = DID_ERROR << 16;
 166
 167                                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: "
 168                                         "Mid-layer Data underrun0, "
 169                                         "xferlen = 0x%x, "
 170                                         "residual = 0x%x\n", ha->host_no,
 171                                         cmd->device->channel,
 172                                         cmd->device->id,
 173                                         cmd->device->lun, __func__,
 174                                         scsi_bufflen(cmd), residual));
 175                                 break;
 176                         }
 177                 }
 178
 179                 cmd->result = DID_OK << 16 | scsi_status;
 180
 181                 if (scsi_status != SCSI_CHECK_CONDITION)
 182                         break;
 183
 184                 /* Copy Sense Data into sense buffer. */
 185                 qla4xxx_copy_sense(ha, sts_entry, srb);
 186                 break;
 187
 188         case SCS_INCOMPLETE:
 189                 /* Always set the status to DID_ERROR, since
 190                  * all conditions result in that status anyway */
 191                 cmd->result = DID_ERROR << 16;
 192                 break;
 193
 194         case SCS_RESET_OCCURRED:
 195                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: Device RESET occurred\n",
 196                               ha->host_no, cmd->device->channel,
 197                               cmd->device->id, cmd->device->lun, __func__));
 198
 199                 cmd->result = DID_RESET << 16;
 200                 break;
 201
 202         case SCS_ABORTED:
 203                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: Abort occurred\n",
 204                               ha->host_no, cmd->device->channel,
 205                               cmd->device->id, cmd->device->lun, __func__));
 206
 207                 cmd->result = DID_RESET << 16;
 208                 break;
 209
 210         case SCS_TIMEOUT:
 211                 DEBUG2(printk(KERN_INFO "scsi%ld:%d:%d:%d: Timeout\n",
 212                               ha->host_no, cmd->device->channel,
 213                               cmd->device->id, cmd->device->lun));
 214
 215                 cmd->result = DID_TRANSPORT_DISRUPTED << 16;
 216
 217                 /*
 218                  * Mark device missing so that we won't continue to send
 219                  * I/O to this device.  We should get a ddb state change
 220                  * AEN soon.
 221                  */
 222                 if (atomic_read(&ddb_entry->state) == DDB_STATE_ONLINE)
 223                         qla4xxx_mark_device_missing(ha, ddb_entry);
 224                 break;
 225
 226         case SCS_DATA_UNDERRUN:
 227         case SCS_DATA_OVERRUN:
 228                 if ((sts_entry->iscsiFlags & ISCSI_FLAG_RESIDUAL_OVER) ||
 229                      (sts_entry->completionStatus == SCS_DATA_OVERRUN)) {
 230                         DEBUG2(printk("scsi%ld:%d:%d:%d: %s: " "Data overrun\n",
 231                                       ha->host_no,
 232                                       cmd->device->channel, cmd->device->id,
 233                                       cmd->device->lun, __func__));
 234
 235                         cmd->result = DID_ERROR << 16;
 236                         break;
 237                 }
 238
 239                 scsi_set_resid(cmd, residual);
 240
 241                 /*
 242                  * If there is scsi_status, it takes precedense over
 243                  * underflow condition.
 244                  */
 245                 if (scsi_status != 0) {
 246                         cmd->result = DID_OK << 16 | scsi_status;
 247
 248                         if (scsi_status != SCSI_CHECK_CONDITION)
 249                                 break;
 250
 251                         /* Copy Sense Data into sense buffer. */
 252                         qla4xxx_copy_sense(ha, sts_entry, srb);
 253                 } else {
 254                         /*
 255                          * If RISC reports underrun and target does not
 256                          * report it then we must have a lost frame, so
 257                          * tell upper layer to retry it by reporting a
 258                          * bus busy.
 259                          */
 260                         if ((sts_entry->iscsiFlags &
 261                              ISCSI_FLAG_RESIDUAL_UNDER) == 0) {
 262                                 cmd->result = DID_BUS_BUSY << 16;
 263                         } else if ((scsi_bufflen(cmd) - residual) <
 264                                    cmd->underflow) {
 265                                 /*
 266                                  * Handle mid-layer underflow???
 267                                  *
 268                                  * For kernels less than 2.4, the driver must
 269                                  * return an error if an underflow is detected.
 270                                  * For kernels equal-to and above 2.4, the
 271                                  * mid-layer will appearantly handle the
 272                                  * underflow by detecting the residual count --
 273                                  * unfortunately, we do not see where this is
 274                                  * actually being done.  In the interim, we
 275                                  * will return DID_ERROR.
 276                                  */
 277                                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: "
 278                                         "Mid-layer Data underrun1, "
 279                                         "xferlen = 0x%x, "
 280                                         "residual = 0x%x\n", ha->host_no,
 281                                         cmd->device->channel,
 282                                         cmd->device->id,
 283                                         cmd->device->lun, __func__,
 284                                         scsi_bufflen(cmd), residual));
 285
 286                                 cmd->result = DID_ERROR << 16;
 287                         } else {
 288                                 cmd->result = DID_OK << 16;
 289                         }
 290                 }
 291                 break;
 292
 293         case SCS_DEVICE_LOGGED_OUT:
 294         case SCS_DEVICE_UNAVAILABLE:
 295                 DEBUG2(printk(KERN_INFO "scsi%ld:%d:%d:%d: SCS_DEVICE "
 296                     "state: 0x%x\n", ha->host_no,
 297                     cmd->device->channel, cmd->device->id,
 298                     cmd->device->lun, sts_entry->completionStatus));
 299                 /*
 300                  * Mark device missing so that we won't continue to
 301                  * send I/O to this device.  We should get a ddb
 302                  * state change AEN soon.
 303                  */
 304                 if (atomic_read(&ddb_entry->state) == DDB_STATE_ONLINE)
 305                         qla4xxx_mark_device_missing(ha, ddb_entry);
 306
 307                 cmd->result = DID_TRANSPORT_DISRUPTED << 16;
 308                 break;
 309
 310         case SCS_QUEUE_FULL:
 311                 /*
 312                  * SCSI Mid-Layer handles device queue full
 313                  */
 314                 cmd->result = DID_OK << 16 | sts_entry->scsiStatus;
 315                 DEBUG2(printk("scsi%ld:%d:%d: %s: QUEUE FULL detected "
 316                               "compl=%02x, scsi=%02x, state=%02x, iFlags=%02x,"
 317                               " iResp=%02x\n", ha->host_no, cmd->device->id,
 318                               cmd->device->lun, __func__,
 319                               sts_entry->completionStatus,
 320                               sts_entry->scsiStatus, sts_entry->state_flags,
 321                               sts_entry->iscsiFlags,
 322                               sts_entry->iscsiResponse));
 323                 break;
 324
 325         default:
 326                 cmd->result = DID_ERROR << 16;
 327                 break;
 328         }
 329
 330 status_entry_exit:
 331
 332         /* complete the request, if not waiting for status_continuation pkt */
 333         srb->cc_stat = sts_entry->completionStatus;
 334         if (ha->status_srb == NULL)
 335                 kref_put(&srb->srb_ref, qla4xxx_srb_compl);
 336 }
 337
 338 /**
 339  * qla4xxx_process_response_queue - process response queue completions
 340  * @ha: Pointer to host adapter structure.
 341  *
 342  * This routine process response queue completions in interrupt context.
 343  * Hardware_lock locked upon entry
 344  **/
 345 void qla4xxx_process_response_queue(struct scsi_qla_host *ha)
 346 {
 347         uint32_t count = 0;
 348         struct srb *srb = NULL;
 349         struct status_entry *sts_entry;
 350
 351         /* Process all responses from response queue */
 352         while ((ha->response_ptr->signature != RESPONSE_PROCESSED)) {
 353                 sts_entry = (struct status_entry *) ha->response_ptr;
 354                 count++;
 355
 356                 /* Advance pointers for next entry */
 357                 if (ha->response_out == (RESPONSE_QUEUE_DEPTH - 1)) {
 358                         ha->response_out = 0;
 359                         ha->response_ptr = ha->response_ring;
 360                 } else {
 361                         ha->response_out++;
 362                         ha->response_ptr++;
 363                 }
 364
 365                 /* process entry */
 366                 switch (sts_entry->hdr.entryType) {
 367                 case ET_STATUS:
 368                         /* Common status */
 369                         qla4xxx_status_entry(ha, sts_entry);
 370                         break;
 371
 372                 case ET_PASSTHRU_STATUS:
 373                         break;
 374
 375                 case ET_STATUS_CONTINUATION:
 376                         qla4xxx_status_cont_entry(ha,
 377                                 (struct status_cont_entry *) sts_entry);
 378                         break;
 379
 380                 case ET_COMMAND:
 381                         /* ISP device queue is full. Command not
 382                          * accepted by ISP.  Queue command for
 383                          * later */
 384
 385                         srb = qla4xxx_del_from_active_array(ha,
 386                                                     le32_to_cpu(sts_entry->
 387                                                                 handle));
 388                         if (srb == NULL)
 389                                 goto exit_prq_invalid_handle;
 390
 391                         DEBUG2(printk("scsi%ld: %s: FW device queue full, "
 392                                       "srb %p\n", ha->host_no, __func__, srb));
 393
 394                         /* ETRY normally by sending it back with
 395                          * DID_BUS_BUSY */
 396                         srb->cmd->result = DID_BUS_BUSY << 16;
 397                         kref_put(&srb->srb_ref, qla4xxx_srb_compl);
 398                         break;
 399
 400                 case ET_CONTINUE:
 401                         /* Just throw away the continuation entries */
 402                         DEBUG2(printk("scsi%ld: %s: Continuation entry - "
 403                                       "ignoring\n", ha->host_no, __func__));
 404                         break;
 405
 406                 default:
 407                         /*
 408                          * Invalid entry in response queue, reset RISC
 409                          * firmware.
 410                          */
 411                         DEBUG2(printk("scsi%ld: %s: Invalid entry %x in "
 412                                       "response queue \n", ha->host_no,
 413                                       __func__,
 414                                       sts_entry->hdr.entryType));
 415                         goto exit_prq_error;
 416                 }
 417                 ((struct response *)sts_entry)->signature = RESPONSE_PROCESSED;
 418                 wmb();
 419         }
 420
 421         /*
 422          * Tell ISP we're done with response(s). This also clears the interrupt.
 423          */
 424         ha->isp_ops->complete_iocb(ha);
 425
 426         return;
 427
 428 exit_prq_invalid_handle:
 429         DEBUG2(printk("scsi%ld: %s: Invalid handle(srb)=%p type=%x IOCS=%x\n",
 430                       ha->host_no, __func__, srb, sts_entry->hdr.entryType,
 431                       sts_entry->completionStatus));
 432
 433 exit_prq_error:
 434         ha->isp_ops->complete_iocb(ha);
 435         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 436 }
 437
 438 /**
 439  * qla4xxx_isr_decode_mailbox - decodes mailbox status
 440  * @ha: Pointer to host adapter structure.
 441  * @mailbox_status: Mailbox status.
 442  *
 443  * This routine decodes the mailbox status during the ISR.
 444  * Hardware_lock locked upon entry. runs in interrupt context.
 445  **/
 446 static void qla4xxx_isr_decode_mailbox(struct scsi_qla_host * ha,
 447                                        uint32_t mbox_status)
 448 {
 449         int i;
 450         uint32_t mbox_sts[MBOX_AEN_REG_COUNT];
 451
 452         if ((mbox_status == MBOX_STS_BUSY) ||
 453             (mbox_status == MBOX_STS_INTERMEDIATE_COMPLETION) ||
 454             (mbox_status >> 12 == MBOX_COMPLETION_STATUS)) {
 455                 ha->mbox_status[0] = mbox_status;
 456
 457                 if (test_bit(AF_MBOX_COMMAND, &ha->flags)) {
 458                         /*
 459                          * Copy all mailbox registers to a temporary
 460                          * location and set mailbox command done flag
 461                          */
 462                         for (i = 0; i < ha->mbox_status_count; i++)
 463                                 ha->mbox_status[i] = is_qla8022(ha)
 464                                     ? readl(&ha->qla4_8xxx_reg->mailbox_out[i])
 465                                     : readl(&ha->reg->mailbox[i]);
 466
 467                         set_bit(AF_MBOX_COMMAND_DONE, &ha->flags);
 468
 469                         if (test_bit(AF_MBOX_COMMAND_NOPOLL, &ha->flags))
 470                                 complete(&ha->mbx_intr_comp);
 471                 }
 472         } else if (mbox_status >> 12 == MBOX_ASYNC_EVENT_STATUS) {
 473                 for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
 474                         mbox_sts[i] = is_qla8022(ha)
 475                             ? readl(&ha->qla4_8xxx_reg->mailbox_out[i])
 476                             : readl(&ha->reg->mailbox[i]);
 477
 478                 /* Immediately process the AENs that don't require much work.
 479                  * Only queue the database_changed AENs */
 480                 if (ha->aen_log.count < MAX_AEN_ENTRIES) {
 481                         for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
 482                                 ha->aen_log.entry[ha->aen_log.count].mbox_sts[i] =
 483                                     mbox_sts[i];
 484                         ha->aen_log.count++;
 485                 }
 486                 switch (mbox_status) {
 487                 case MBOX_ASTS_SYSTEM_ERROR:
 488                         /* Log Mailbox registers */
 489                         ql4_printk(KERN_INFO, ha, "%s: System Err\n", __func__);
 490                         qla4xxx_dump_registers(ha);
 491
 492                         if (ql4xdontresethba) {
 493                                 DEBUG2(printk("scsi%ld: %s:Don't Reset HBA\n",
 494                                     ha->host_no, __func__));
 495                         } else {
 496                                 set_bit(AF_GET_CRASH_RECORD, &ha->flags);
 497                                 set_bit(DPC_RESET_HA, &ha->dpc_flags);
 498                         }
 499                         break;
 500
 501                 case MBOX_ASTS_REQUEST_TRANSFER_ERROR:
 502                 case MBOX_ASTS_RESPONSE_TRANSFER_ERROR:
 503                 case MBOX_ASTS_NVRAM_INVALID:
 504                 case MBOX_ASTS_IP_ADDRESS_CHANGED:
 505                 case MBOX_ASTS_DHCP_LEASE_EXPIRED:
 506                         DEBUG2(printk("scsi%ld: AEN %04x, ERROR Status, "
 507                                       "Reset HA\n", ha->host_no, mbox_status));
 508                         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 509                         break;
 510
 511                 case MBOX_ASTS_LINK_UP:
 512                         set_bit(AF_LINK_UP, &ha->flags);
 513                         if (test_bit(AF_INIT_DONE, &ha->flags))
 514                                 set_bit(DPC_LINK_CHANGED, &ha->dpc_flags);
 515
 516                         ql4_printk(KERN_INFO, ha, "%s: LINK UP\n", __func__);
 517                         break;
 518
 519                 case MBOX_ASTS_LINK_DOWN:
 520                         clear_bit(AF_LINK_UP, &ha->flags);
 521                         if (test_bit(AF_INIT_DONE, &ha->flags))
 522                                 set_bit(DPC_LINK_CHANGED, &ha->dpc_flags);
 523
 524                         ql4_printk(KERN_INFO, ha, "%s: LINK DOWN\n", __func__);
 525                         break;
 526
 527                 case MBOX_ASTS_HEARTBEAT:
 528                         ha->seconds_since_last_heartbeat = 0;
 529                         break;
 530
 531                 case MBOX_ASTS_DHCP_LEASE_ACQUIRED:
 532                         DEBUG2(printk("scsi%ld: AEN %04x DHCP LEASE "
 533                                       "ACQUIRED\n", ha->host_no, mbox_status));
 534                         set_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags);
 535                         break;
 536
 537                 case MBOX_ASTS_PROTOCOL_STATISTIC_ALARM:
 538                 case MBOX_ASTS_SCSI_COMMAND_PDU_REJECTED: /* Target
 539                                                            * mode
 540                                                            * only */
 541                 case MBOX_ASTS_UNSOLICITED_PDU_RECEIVED:  /* Connection mode */
 542                 case MBOX_ASTS_IPSEC_SYSTEM_FATAL_ERROR:
 543                 case MBOX_ASTS_SUBNET_STATE_CHANGE:
 544                         /* No action */
 545                         DEBUG2(printk("scsi%ld: AEN %04x\n", ha->host_no,
 546                                       mbox_status));
 547                         break;
 548
 549                 case MBOX_ASTS_IP_ADDR_STATE_CHANGED:
 550                         printk("scsi%ld: AEN %04x, mbox_sts[2]=%04x, "
 551                             "mbox_sts[3]=%04x\n", ha->host_no, mbox_sts[0],
 552                             mbox_sts[2], mbox_sts[3]);
 553
 554                         /* mbox_sts[2] = Old ACB state
 555                          * mbox_sts[3] = new ACB state */
 556                         if ((mbox_sts[3] == ACB_STATE_VALID) &&
 557                             (mbox_sts[2] == ACB_STATE_TENTATIVE))
 558                                 set_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags);
 559                         else if ((mbox_sts[3] == ACB_STATE_ACQUIRING) &&
 560                             (mbox_sts[2] == ACB_STATE_VALID))
 561                                 set_bit(DPC_RESET_HA, &ha->dpc_flags);
 562                         break;
 563
 564                 case MBOX_ASTS_MAC_ADDRESS_CHANGED:
 565                 case MBOX_ASTS_DNS:
 566                         /* No action */
 567                         DEBUG2(printk(KERN_INFO "scsi%ld: AEN %04x, "
 568                                       "mbox_sts[1]=%04x, mbox_sts[2]=%04x\n",
 569                                       ha->host_no, mbox_sts[0],
 570                                       mbox_sts[1], mbox_sts[2]));
 571                         break;
 572
 573                 case MBOX_ASTS_SELF_TEST_FAILED:
 574                 case MBOX_ASTS_LOGIN_FAILED:
 575                         /* No action */
 576                         DEBUG2(printk("scsi%ld: AEN %04x, mbox_sts[1]=%04x, "
 577                                       "mbox_sts[2]=%04x, mbox_sts[3]=%04x\n",
 578                                       ha->host_no, mbox_sts[0], mbox_sts[1],
 579                                       mbox_sts[2], mbox_sts[3]));
 580                         break;
 581
 582                 case MBOX_ASTS_DATABASE_CHANGED:
 583                         /* Queue AEN information and process it in the DPC
 584                          * routine */
 585                         if (ha->aen_q_count > 0) {
 586
 587                                 /* decrement available counter */
 588                                 ha->aen_q_count--;
 589
 590                                 for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
 591                                         ha->aen_q[ha->aen_in].mbox_sts[i] =
 592                                             mbox_sts[i];
 593
 594                                 /* print debug message */
 595                                 DEBUG2(printk("scsi%ld: AEN[%d] %04x queued"
 596                                     " mb1:0x%x mb2:0x%x mb3:0x%x mb4:0x%x\n",
 597                                     ha->host_no, ha->aen_in, mbox_sts[0],
 598                                     mbox_sts[1], mbox_sts[2],  mbox_sts[3],
 599                                     mbox_sts[4]));
 600
 601                                 /* advance pointer */
 602                                 ha->aen_in++;
 603                                 if (ha->aen_in == MAX_AEN_ENTRIES)
 604                                         ha->aen_in = 0;
 605
 606                                 /* The DPC routine will process the aen */
 607                                 set_bit(DPC_AEN, &ha->dpc_flags);
 608                         } else {
 609                                 DEBUG2(printk("scsi%ld: %s: aen %04x, queue "
 610                                               "overflowed!  AEN LOST!!\n",
 611                                               ha->host_no, __func__,
 612                                               mbox_sts[0]));
 613
 614                                 DEBUG2(printk("scsi%ld: DUMP AEN QUEUE\n",
 615                                               ha->host_no));
 616
 617                                 for (i = 0; i < MAX_AEN_ENTRIES; i++) {
 618                                         DEBUG2(printk("AEN[%d] %04x %04x %04x "
 619                                                       "%04x\n", i, mbox_sts[0],
 620                                                       mbox_sts[1], mbox_sts[2],
 621                                                       mbox_sts[3]));
 622                                 }
 623                         }
 624                         break;
 625
 626                 case MBOX_ASTS_TXSCVR_INSERTED:
 627                         DEBUG2(printk(KERN_WARNING
 628                             "scsi%ld: AEN %04x Transceiver"
 629                             " inserted\n",  ha->host_no, mbox_sts[0]));
 630                         break;
 631
 632                 case MBOX_ASTS_TXSCVR_REMOVED:
 633                         DEBUG2(printk(KERN_WARNING
 634                             "scsi%ld: AEN %04x Transceiver"
 635                             " removed\n",  ha->host_no, mbox_sts[0]));
 636                         break;
 637
 638                 default:
 639                         DEBUG2(printk(KERN_WARNING
 640                                       "scsi%ld: AEN %04x UNKNOWN\n",
 641                                       ha->host_no, mbox_sts[0]));
 642                         break;
 643                 }
 644         } else {
 645                 DEBUG2(printk("scsi%ld: Unknown mailbox status %08X\n",
 646                               ha->host_no, mbox_status));
 647
 648                 ha->mbox_status[0] = mbox_status;
 649         }
 650 }
 651
 652 /**
 653  * qla4_8xxx_interrupt_service_routine - isr
 654  * @ha: pointer to host adapter structure.
 655  *
 656  * This is the main interrupt service routine.
 657  * hardware_lock locked upon entry. runs in interrupt context.
 658  **/
 659 void qla4_8xxx_interrupt_service_routine(struct scsi_qla_host *ha,
 660     uint32_t intr_status)
 661 {
 662         /* Process response queue interrupt. */
 663         if (intr_status & HSRX_RISC_IOCB_INT)
 664                 qla4xxx_process_response_queue(ha);
 665
 666         /* Process mailbox/asynch event interrupt.*/
 667         if (intr_status & HSRX_RISC_MB_INT)
 668                 qla4xxx_isr_decode_mailbox(ha,
 669                     readl(&ha->qla4_8xxx_reg->mailbox_out[0]));
 670
 671         /* clear the interrupt */
 672         writel(0, &ha->qla4_8xxx_reg->host_int);
 673         readl(&ha->qla4_8xxx_reg->host_int);
 674 }
 675
 676 /**
 677  * qla4xxx_interrupt_service_routine - isr
 678  * @ha: pointer to host adapter structure.
 679  *
 680  * This is the main interrupt service routine.
 681  * hardware_lock locked upon entry. runs in interrupt context.
 682  **/
 683 void qla4xxx_interrupt_service_routine(struct scsi_qla_host * ha,
 684                                        uint32_t intr_status)
 685 {
 686         /* Process response queue interrupt. */
 687         if (intr_status & CSR_SCSI_COMPLETION_INTR)
 688                 qla4xxx_process_response_queue(ha);
 689
 690         /* Process mailbox/asynch event  interrupt.*/
 691         if (intr_status & CSR_SCSI_PROCESSOR_INTR) {
 692                 qla4xxx_isr_decode_mailbox(ha,
 693                                            readl(&ha->reg->mailbox[0]));
 694
 695                 /* Clear Mailbox Interrupt */
 696                 writel(set_rmask(CSR_SCSI_PROCESSOR_INTR),
 697                        &ha->reg->ctrl_status);
 698                 readl(&ha->reg->ctrl_status);
 699         }
 700 }
 701
 702 /**
 703  * qla4_8xxx_spurious_interrupt - processes spurious interrupt
 704  * @ha: pointer to host adapter structure.
 705  * @reqs_count: .
 706  *
 707  **/
 708 static void qla4_8xxx_spurious_interrupt(struct scsi_qla_host *ha,
 709     uint8_t reqs_count)
 710 {
 711         if (reqs_count)
 712                 return;
 713
 714         DEBUG2(ql4_printk(KERN_INFO, ha, "Spurious Interrupt\n"));
 715         if (is_qla8022(ha)) {
 716                 writel(0, &ha->qla4_8xxx_reg->host_int);
 717                 if (test_bit(AF_INTx_ENABLED, &ha->flags))
 718                         qla4_8xxx_wr_32(ha, ha->nx_legacy_intr.tgt_mask_reg,
 719                             0xfbff);
 720         }
 721         ha->spurious_int_count++;
 722 }
 723
 724 /**
 725  * qla4xxx_intr_handler - hardware interrupt handler.
 726  * @irq: Unused
 727  * @dev_id: Pointer to host adapter structure
 728  **/
 729 irqreturn_t qla4xxx_intr_handler(int irq, void *dev_id)
 730 {
 731         struct scsi_qla_host *ha;
 732         uint32_t intr_status;
 733         unsigned long flags = 0;
 734         uint8_t reqs_count = 0;
 735
 736         ha = (struct scsi_qla_host *) dev_id;
 737         if (!ha) {
 738                 DEBUG2(printk(KERN_INFO
 739                               "qla4xxx: Interrupt with NULL host ptr\n"));
 740                 return IRQ_NONE;
 741         }
 742
 743         spin_lock_irqsave(&ha->hardware_lock, flags);
 744
 745         ha->isr_count++;
 746         /*
 747          * Repeatedly service interrupts up to a maximum of
 748          * MAX_REQS_SERVICED_PER_INTR
 749          */
 750         while (1) {
 751                 /*
 752                  * Read interrupt status
 753                  */
 754                 if (ha->isp_ops->rd_shdw_rsp_q_in(ha) !=
 755                     ha->response_out)
 756                         intr_status = CSR_SCSI_COMPLETION_INTR;
 757                 else
 758                         intr_status = readl(&ha->reg->ctrl_status);
 759
 760                 if ((intr_status &
 761                     (CSR_SCSI_RESET_INTR|CSR_FATAL_ERROR|INTR_PENDING)) == 0) {
 762                         if (reqs_count == 0)
 763                                 ha->spurious_int_count++;
 764                         break;
 765                 }
 766
 767                 if (intr_status & CSR_FATAL_ERROR) {
 768                         DEBUG2(printk(KERN_INFO "scsi%ld: Fatal Error, "
 769                                       "Status 0x%04x\n", ha->host_no,
 770                                       readl(isp_port_error_status (ha))));
 771
 772                         /* Issue Soft Reset to clear this error condition.
 773                          * This will prevent the RISC from repeatedly
 774                          * interrupting the driver; thus, allowing the DPC to
 775                          * get scheduled to continue error recovery.
 776                          * NOTE: Disabling RISC interrupts does not work in
 777                          * this case, as CSR_FATAL_ERROR overrides
 778                          * CSR_SCSI_INTR_ENABLE */
 779                         if ((readl(&ha->reg->ctrl_status) &
 780                              CSR_SCSI_RESET_INTR) == 0) {
 781                                 writel(set_rmask(CSR_SOFT_RESET),
 782                                        &ha->reg->ctrl_status);
 783                                 readl(&ha->reg->ctrl_status);
 784                         }
 785
 786                         writel(set_rmask(CSR_FATAL_ERROR),
 787                                &ha->reg->ctrl_status);
 788                         readl(&ha->reg->ctrl_status);
 789
 790                         __qla4xxx_disable_intrs(ha);
 791
 792                         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 793
 794                         break;
 795                 } else if (intr_status & CSR_SCSI_RESET_INTR) {
 796                         clear_bit(AF_ONLINE, &ha->flags);
 797                         __qla4xxx_disable_intrs(ha);
 798
 799                         writel(set_rmask(CSR_SCSI_RESET_INTR),
 800                                &ha->reg->ctrl_status);
 801                         readl(&ha->reg->ctrl_status);
 802
 803                         if (!test_bit(AF_HBA_GOING_AWAY, &ha->flags))
 804                                 set_bit(DPC_RESET_HA_INTR, &ha->dpc_flags);
 805
 806                         break;
 807                 } else if (intr_status & INTR_PENDING) {
 808                         ha->isp_ops->interrupt_service_routine(ha, intr_status);
 809                         ha->total_io_count++;
 810                         if (++reqs_count == MAX_REQS_SERVICED_PER_INTR)
 811                                 break;
 812                 }
 813         }
 814
 815         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 816
 817         return IRQ_HANDLED;
 818 }
 819
 820 /**
 821  * qla4_8xxx_intr_handler - hardware interrupt handler.
 822  * @irq: Unused
 823  * @dev_id: Pointer to host adapter structure
 824  **/
 825 irqreturn_t qla4_8xxx_intr_handler(int irq, void *dev_id)
 826 {
 827         struct scsi_qla_host *ha = dev_id;
 828         uint32_t intr_status;
 829         uint32_t status;
 830         unsigned long flags = 0;
 831         uint8_t reqs_count = 0;
 832
 833         if (unlikely(pci_channel_offline(ha->pdev)))
 834                 return IRQ_HANDLED;
 835
 836         ha->isr_count++;
 837         status = qla4_8xxx_rd_32(ha, ISR_INT_VECTOR);
 838         if (!(status & ha->nx_legacy_intr.int_vec_bit))
 839                 return IRQ_NONE;
 840
 841         status = qla4_8xxx_rd_32(ha, ISR_INT_STATE_REG);
 842         if (!ISR_IS_LEGACY_INTR_TRIGGERED(status)) {
 843                 DEBUG2(ql4_printk(KERN_INFO, ha,
 844                     "%s legacy Int not triggered\n", __func__));
 845                 return IRQ_NONE;
 846         }
 847
 848         /* clear the interrupt */
 849         qla4_8xxx_wr_32(ha, ha->nx_legacy_intr.tgt_status_reg, 0xffffffff);
 850
 851         /* read twice to ensure write is flushed */
 852         qla4_8xxx_rd_32(ha, ISR_INT_VECTOR);
 853         qla4_8xxx_rd_32(ha, ISR_INT_VECTOR);
 854
 855         spin_lock_irqsave(&ha->hardware_lock, flags);
 856         while (1) {
 857                 if (!(readl(&ha->qla4_8xxx_reg->host_int) &
 858                     ISRX_82XX_RISC_INT)) {
 859                         qla4_8xxx_spurious_interrupt(ha, reqs_count);
 860                         break;
 861                 }
 862                 intr_status =  readl(&ha->qla4_8xxx_reg->host_status);
 863                 if ((intr_status &
 864                     (HSRX_RISC_MB_INT | HSRX_RISC_IOCB_INT)) == 0)  {
 865                         qla4_8xxx_spurious_interrupt(ha, reqs_count);
 866                         break;
 867                 }
 868
 869                 ha->isp_ops->interrupt_service_routine(ha, intr_status);
 870
 871                 /* Enable Interrupt */
 872                 qla4_8xxx_wr_32(ha, ha->nx_legacy_intr.tgt_mask_reg, 0xfbff);
 873
 874                 if (++reqs_count == MAX_REQS_SERVICED_PER_INTR)
 875                         break;
 876         }
 877
 878         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 879         return IRQ_HANDLED;
 880 }
 881
 882 irqreturn_t
 883 qla4_8xxx_msi_handler(int irq, void *dev_id)
 884 {
 885         struct scsi_qla_host *ha;
 886
 887         ha = (struct scsi_qla_host *) dev_id;
 888         if (!ha) {
 889                 DEBUG2(printk(KERN_INFO
 890                     "qla4xxx: MSIX: Interrupt with NULL host ptr\n"));
 891                 return IRQ_NONE;
 892         }
 893
 894         ha->isr_count++;
 895         /* clear the interrupt */
 896         qla4_8xxx_wr_32(ha, ha->nx_legacy_intr.tgt_status_reg, 0xffffffff);
 897
 898         /* read twice to ensure write is flushed */
 899         qla4_8xxx_rd_32(ha, ISR_INT_VECTOR);
 900         qla4_8xxx_rd_32(ha, ISR_INT_VECTOR);
 901
 902         return qla4_8xxx_default_intr_handler(irq, dev_id);
 903 }
 904
 905 /**
 906  * qla4_8xxx_default_intr_handler - hardware interrupt handler.
 907  * @irq: Unused
 908  * @dev_id: Pointer to host adapter structure
 909  *
 910  * This interrupt handler is called directly for MSI-X, and
 911  * called indirectly for MSI.
 912  **/
 913 irqreturn_t
 914 qla4_8xxx_default_intr_handler(int irq, void *dev_id)
 915 {
 916         struct scsi_qla_host *ha = dev_id;
 917         unsigned long   flags;
 918         uint32_t intr_status;
 919         uint8_t reqs_count = 0;
 920
 921         spin_lock_irqsave(&ha->hardware_lock, flags);
 922         while (1) {
 923                 if (!(readl(&ha->qla4_8xxx_reg->host_int) &
 924                     ISRX_82XX_RISC_INT)) {
 925                         qla4_8xxx_spurious_interrupt(ha, reqs_count);
 926                         break;
 927                 }
 928
 929                 intr_status =  readl(&ha->qla4_8xxx_reg->host_status);
 930                 if ((intr_status &
 931                     (HSRX_RISC_MB_INT | HSRX_RISC_IOCB_INT)) == 0) {
 932                         qla4_8xxx_spurious_interrupt(ha, reqs_count);
 933                         break;
 934                 }
 935
 936                 ha->isp_ops->interrupt_service_routine(ha, intr_status);
 937
 938                 if (++reqs_count == MAX_REQS_SERVICED_PER_INTR)
 939                         break;
 940         }
 941
 942         ha->isr_count++;
 943         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 944         return IRQ_HANDLED;
 945 }
 946
 947 irqreturn_t
 948 qla4_8xxx_msix_rsp_q(int irq, void *dev_id)
 949 {
 950         struct scsi_qla_host *ha = dev_id;
 951         unsigned long flags;
 952
 953         spin_lock_irqsave(&ha->hardware_lock, flags);
 954         qla4xxx_process_response_queue(ha);
 955         writel(0, &ha->qla4_8xxx_reg->host_int);
 956         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 957
 958         ha->isr_count++;
 959         return IRQ_HANDLED;
 960 }
 961
 962 /**
 963  * qla4xxx_process_aen - processes AENs generated by firmware
 964  * @ha: pointer to host adapter structure.
 965  * @process_aen: type of AENs to process
 966  *
 967  * Processes specific types of Asynchronous Events generated by firmware.
 968  * The type of AENs to process is specified by process_aen and can be
 969  *      PROCESS_ALL_AENS         0
 970  *      FLUSH_DDB_CHANGED_AENS   1
 971  *      RELOGIN_DDB_CHANGED_AENS 2
 972  **/
 973 void qla4xxx_process_aen(struct scsi_qla_host * ha, uint8_t process_aen)
 974 {
 975         uint32_t mbox_sts[MBOX_AEN_REG_COUNT];
 976         struct aen *aen;
 977         int i;
 978         unsigned long flags;
 979
 980         spin_lock_irqsave(&ha->hardware_lock, flags);
 981         while (ha->aen_out != ha->aen_in) {
 982                 aen = &ha->aen_q[ha->aen_out];
 983                 /* copy aen information to local structure */
 984                 for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
 985                         mbox_sts[i] = aen->mbox_sts[i];
 986
 987                 ha->aen_q_count++;
 988                 ha->aen_out++;
 989
 990                 if (ha->aen_out == MAX_AEN_ENTRIES)
 991                         ha->aen_out = 0;
 992
 993                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 994
 995                 DEBUG2(printk("qla4xxx(%ld): AEN[%d]=0x%08x, mbx1=0x%08x mbx2=0x%08x"
 996                         " mbx3=0x%08x mbx4=0x%08x\n", ha->host_no,
 997                         (ha->aen_out ? (ha->aen_out-1): (MAX_AEN_ENTRIES-1)),
 998                         mbox_sts[0], mbox_sts[1], mbox_sts[2],
 999                         mbox_sts[3], mbox_sts[4]));
1000
1001                 switch (mbox_sts[0]) {
1002                 case MBOX_ASTS_DATABASE_CHANGED:
1003                         if (process_aen == FLUSH_DDB_CHANGED_AENS) {
1004                                 DEBUG2(printk("scsi%ld: AEN[%d] %04x, index "
1005                                               "[%d] state=%04x FLUSHED!\n",
1006                                               ha->host_no, ha->aen_out,
1007                                               mbox_sts[0], mbox_sts[2],
1008                                               mbox_sts[3]));
1009                                 break;
1010                         } else if (process_aen == RELOGIN_DDB_CHANGED_AENS) {
1011                                 /* for use during init time, we only want to
1012                                  * relogin non-active ddbs */
1013                                 struct ddb_entry *ddb_entry;
1014
1015                                 ddb_entry =
1016                                         /* FIXME: name length? */
1017                                         qla4xxx_lookup_ddb_by_fw_index(ha,
1018                                                                        mbox_sts[2]);
1019                                 if (!ddb_entry)
1020                                         break;
1021
1022                                 ddb_entry->dev_scan_wait_to_complete_relogin =
1023                                         0;
1024                                 ddb_entry->dev_scan_wait_to_start_relogin =
1025                                         jiffies +
1026                                         ((ddb_entry->default_time2wait +
1027                                           4) * HZ);
1028
1029                                 DEBUG2(printk("scsi%ld: ddb [%d] initate"
1030                                               " RELOGIN after %d seconds\n",
1031                                               ha->host_no,
1032                                               ddb_entry->fw_ddb_index,
1033                                               ddb_entry->default_time2wait +
1034                                               4));
1035                                 break;
1036                         }
1037
1038                         if (mbox_sts[1] == 0) { /* Global DB change. */
1039                                 qla4xxx_reinitialize_ddb_list(ha);
1040                         } else if (mbox_sts[1] == 1) {  /* Specific device. */
1041                                 qla4xxx_process_ddb_changed(ha, mbox_sts[2],
1042                                                 mbox_sts[3], mbox_sts[4]);
1043                         }
1044                         break;
1045                 }
1046                 spin_lock_irqsave(&ha->hardware_lock, flags);
1047         }
1048         spin_unlock_irqrestore(&ha->hardware_lock, flags);
1049 }
1050
1051 int qla4xxx_request_irqs(struct scsi_qla_host *ha)
1052 {
1053         int ret;
1054
1055         if (!is_qla8022(ha))
1056                 goto try_intx;
1057
1058         if (ql4xenablemsix == 2)
1059                 goto try_msi;
1060
1061         if (ql4xenablemsix == 0 || ql4xenablemsix != 1)
1062                 goto try_intx;
1063
1064         /* Trying MSI-X */
1065         ret = qla4_8xxx_enable_msix(ha);
1066         if (!ret) {
1067                 DEBUG2(ql4_printk(KERN_INFO, ha,
1068                     "MSI-X: Enabled (0x%X).\n", ha->revision_id));
1069                 goto irq_attached;
1070         }
1071
1072         ql4_printk(KERN_WARNING, ha,
1073             "MSI-X: Falling back-to MSI mode -- %d.\n", ret);
1074
1075 try_msi:
1076         /* Trying MSI */
1077         ret = pci_enable_msi(ha->pdev);
1078         if (!ret) {
1079                 ret = request_irq(ha->pdev->irq, qla4_8xxx_msi_handler,
1080                         IRQF_DISABLED|IRQF_SHARED, DRIVER_NAME, ha);
1081                 if (!ret) {
1082                         DEBUG2(ql4_printk(KERN_INFO, ha, "MSI: Enabled.\n"));
1083                         set_bit(AF_MSI_ENABLED, &ha->flags);
1084                         goto irq_attached;
1085                 } else {
1086                         ql4_printk(KERN_WARNING, ha,
1087                             "MSI: Failed to reserve interrupt %d "
1088                             "already in use.\n", ha->pdev->irq);
1089                         pci_disable_msi(ha->pdev);
1090                 }
1091         }
1092         ql4_printk(KERN_WARNING, ha,
1093             "MSI: Falling back-to INTx mode -- %d.\n", ret);
1094
1095 try_intx:
1096         /* Trying INTx */
1097         ret = request_irq(ha->pdev->irq, ha->isp_ops->intr_handler,
1098             IRQF_DISABLED|IRQF_SHARED, DRIVER_NAME, ha);
1099         if (!ret) {
1100                 DEBUG2(ql4_printk(KERN_INFO, ha, "INTx: Enabled.\n"));
1101                 set_bit(AF_INTx_ENABLED, &ha->flags);
1102                 goto irq_attached;
1103
1104         } else {
1105                 ql4_printk(KERN_WARNING, ha,
1106                     "INTx: Failed to reserve interrupt %d already in"
1107                     " use.\n", ha->pdev->irq);
1108                 return ret;
1109         }
1110
1111 irq_attached:
1112         set_bit(AF_IRQ_ATTACHED, &ha->flags);
1113         ha->host->irq = ha->pdev->irq;
1114         ql4_printk(KERN_INFO, ha, "%s: irq %d attached\n",
1115             __func__, ha->pdev->irq);
1116         return ret;
1117 }
1118
1119 void qla4xxx_free_irqs(struct scsi_qla_host *ha)
1120 {
1121         if (test_bit(AF_MSIX_ENABLED, &ha->flags))
1122                 qla4_8xxx_disable_msix(ha);
1123         else if (test_and_clear_bit(AF_MSI_ENABLED, &ha->flags)) {
1124                 free_irq(ha->pdev->irq, ha);
1125                 pci_disable_msi(ha->pdev);
1126         } else if (test_and_clear_bit(AF_INTx_ENABLED, &ha->flags))
1127                 free_irq(ha->pdev->irq, ha);
1128 }