err.no Git - linux-2.6/blob - 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  * qla2x00_process_completed_request() - Process a Fast Post response.
  15  * @ha: SCSI driver HA context
  16  * @index: SRB index
  17  **/
  18 static void qla4xxx_process_completed_request(struct scsi_qla_host *ha,
  19                                               uint32_t index)
  20 {
  21         struct srb *srb;
  22
  23         srb = qla4xxx_del_from_active_array(ha, index);
  24         if (srb) {
  25                 /* Save ISP completion status */
  26                 srb->cmd->result = DID_OK << 16;
  27                 qla4xxx_srb_compl(ha, srb);
  28         } else {
  29                 DEBUG2(printk("scsi%ld: Invalid ISP SCSI completion handle = "
  30                               "%d\n", ha->host_no, index));
  31                 set_bit(DPC_RESET_HA, &ha->dpc_flags);
  32         }
  33 }
  34
  35 /**
  36  * qla4xxx_status_entry - processes status IOCBs
  37  * @ha: Pointer to host adapter structure.
  38  * @sts_entry: Pointer to status entry structure.
  39  **/
  40 static void qla4xxx_status_entry(struct scsi_qla_host *ha,
  41                                  struct status_entry *sts_entry)
  42 {
  43         uint8_t scsi_status;
  44         struct scsi_cmnd *cmd;
  45         struct srb *srb;
  46         struct ddb_entry *ddb_entry;
  47         uint32_t residual;
  48         uint16_t sensebytecnt;
  49
  50         if (sts_entry->completionStatus == SCS_COMPLETE &&
  51             sts_entry->scsiStatus == 0) {
  52                 qla4xxx_process_completed_request(ha,
  53                                                   le32_to_cpu(sts_entry->
  54                                                               handle));
  55                 return;
  56         }
  57
  58         srb = qla4xxx_del_from_active_array(ha, le32_to_cpu(sts_entry->handle));
  59         if (!srb) {
  60                 /* FIXMEdg: Don't we need to reset ISP in this case??? */
  61                 DEBUG2(printk(KERN_WARNING "scsi%ld: %s: Status Entry invalid "
  62                               "handle 0x%x, sp=%p. This cmd may have already "
  63                               "been completed.\n", ha->host_no, __func__,
  64                               le32_to_cpu(sts_entry->handle), srb));
  65                 return;
  66         }
  67
  68         cmd = srb->cmd;
  69         if (cmd == NULL) {
  70                 DEBUG2(printk("scsi%ld: %s: Command already returned back to "
  71                               "OS pkt->handle=%d srb=%p srb->state:%d\n",
  72                               ha->host_no, __func__, sts_entry->handle,
  73                               srb, srb->state));
  74                 dev_warn(&ha->pdev->dev, "Command is NULL:"
  75                         " already returned to OS (srb=%p)\n", srb);
  76                 return;
  77         }
  78
  79         ddb_entry = srb->ddb;
  80         if (ddb_entry == NULL) {
  81                 cmd->result = DID_NO_CONNECT << 16;
  82                 goto status_entry_exit;
  83         }
  84
  85         residual = le32_to_cpu(sts_entry->residualByteCnt);
  86
  87         /* Translate ISP error to a Linux SCSI error. */
  88         scsi_status = sts_entry->scsiStatus;
  89         switch (sts_entry->completionStatus) {
  90         case SCS_COMPLETE:
  91                 if (scsi_status == 0) {
  92                         cmd->result = DID_OK << 16;
  93                         break;
  94                 }
  95
  96                 if (sts_entry->iscsiFlags & ISCSI_FLAG_RESIDUAL_OVER) {
  97                         cmd->result = DID_ERROR << 16;
  98                         break;
  99                 }
 100
 101                 if (sts_entry->iscsiFlags &ISCSI_FLAG_RESIDUAL_UNDER) {
 102                         scsi_set_resid(cmd, residual);
 103                         if ((scsi_bufflen(cmd) - residual) < cmd->underflow) {
 104
 105                                 cmd->result = DID_ERROR << 16;
 106
 107                                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: "
 108                                         "Mid-layer Data underrun0, "
 109                                         "xferlen = 0x%x, "
 110                                         "residual = 0x%x\n", ha->host_no,
 111                                         cmd->device->channel,
 112                                         cmd->device->id,
 113                                         cmd->device->lun, __func__,
 114                                         scsi_bufflen(cmd), residual));
 115                                 break;
 116                         }
 117                 }
 118
 119                 cmd->result = DID_OK << 16 | scsi_status;
 120
 121                 if (scsi_status != SCSI_CHECK_CONDITION)
 122                         break;
 123
 124                 /* Copy Sense Data into sense buffer. */
 125                 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
 126
 127                 sensebytecnt = le16_to_cpu(sts_entry->senseDataByteCnt);
 128                 if (sensebytecnt == 0)
 129                         break;
 130
 131                 memcpy(cmd->sense_buffer, sts_entry->senseData,
 132                        min_t(uint16_t, sensebytecnt, SCSI_SENSE_BUFFERSIZE));
 133
 134                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: sense key = %x, "
 135                               "ASC/ASCQ = %02x/%02x\n", ha->host_no,
 136                               cmd->device->channel, cmd->device->id,
 137                               cmd->device->lun, __func__,
 138                               sts_entry->senseData[2] & 0x0f,
 139                               sts_entry->senseData[12],
 140                               sts_entry->senseData[13]));
 141
 142                 srb->flags |= SRB_GOT_SENSE;
 143                 break;
 144
 145         case SCS_INCOMPLETE:
 146                 /* Always set the status to DID_ERROR, since
 147                  * all conditions result in that status anyway */
 148                 cmd->result = DID_ERROR << 16;
 149                 break;
 150
 151         case SCS_RESET_OCCURRED:
 152                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: Device RESET occurred\n",
 153                               ha->host_no, cmd->device->channel,
 154                               cmd->device->id, cmd->device->lun, __func__));
 155
 156                 cmd->result = DID_RESET << 16;
 157                 break;
 158
 159         case SCS_ABORTED:
 160                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: Abort occurred\n",
 161                               ha->host_no, cmd->device->channel,
 162                               cmd->device->id, cmd->device->lun, __func__));
 163
 164                 cmd->result = DID_RESET << 16;
 165                 break;
 166
 167         case SCS_TIMEOUT:
 168                 DEBUG2(printk(KERN_INFO "scsi%ld:%d:%d:%d: Timeout\n",
 169                               ha->host_no, cmd->device->channel,
 170                               cmd->device->id, cmd->device->lun));
 171
 172                 cmd->result = DID_BUS_BUSY << 16;
 173
 174                 /*
 175                  * Mark device missing so that we won't continue to send
 176                  * I/O to this device.  We should get a ddb state change
 177                  * AEN soon.
 178                  */
 179                 if (atomic_read(&ddb_entry->state) == DDB_STATE_ONLINE)
 180                         qla4xxx_mark_device_missing(ha, ddb_entry);
 181                 break;
 182
 183         case SCS_DATA_UNDERRUN:
 184         case SCS_DATA_OVERRUN:
 185                 if ((sts_entry->iscsiFlags & ISCSI_FLAG_RESIDUAL_OVER) ||
 186                         (sts_entry->completionStatus == SCS_DATA_OVERRUN)) {
 187                         DEBUG2(printk("scsi%ld:%d:%d:%d: %s: " "Data overrun, "
 188                                       "residual = 0x%x\n", ha->host_no,
 189                                       cmd->device->channel, cmd->device->id,
 190                                       cmd->device->lun, __func__, residual));
 191
 192                         cmd->result = DID_ERROR << 16;
 193                         break;
 194                 }
 195
 196                 scsi_set_resid(cmd, residual);
 197
 198                 /*
 199                  * If there is scsi_status, it takes precedense over
 200                  * underflow condition.
 201                  */
 202                 if (scsi_status != 0) {
 203                         cmd->result = DID_OK << 16 | scsi_status;
 204
 205                         if (scsi_status != SCSI_CHECK_CONDITION)
 206                                 break;
 207
 208                         /* Copy Sense Data into sense buffer. */
 209                         memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
 210
 211                         sensebytecnt =
 212                                 le16_to_cpu(sts_entry->senseDataByteCnt);
 213                         if (sensebytecnt == 0)
 214                                 break;
 215
 216                         memcpy(cmd->sense_buffer, sts_entry->senseData,
 217                                min_t(uint16_t, sensebytecnt, SCSI_SENSE_BUFFERSIZE));
 218
 219                         DEBUG2(printk("scsi%ld:%d:%d:%d: %s: sense key = %x, "
 220                                       "ASC/ASCQ = %02x/%02x\n", ha->host_no,
 221                                       cmd->device->channel, cmd->device->id,
 222                                       cmd->device->lun, __func__,
 223                                       sts_entry->senseData[2] & 0x0f,
 224                                       sts_entry->senseData[12],
 225                                       sts_entry->senseData[13]));
 226                 } else {
 227                         /*
 228                          * If RISC reports underrun and target does not
 229                          * report it then we must have a lost frame, so
 230                          * tell upper layer to retry it by reporting a
 231                          * bus busy.
 232                          */
 233                         if ((sts_entry->iscsiFlags &
 234                              ISCSI_FLAG_RESIDUAL_UNDER) == 0) {
 235                                 cmd->result = DID_BUS_BUSY << 16;
 236                         } else if ((scsi_bufflen(cmd) - residual) <
 237                                    cmd->underflow) {
 238                                 /*
 239                                  * Handle mid-layer underflow???
 240                                  *
 241                                  * For kernels less than 2.4, the driver must
 242                                  * return an error if an underflow is detected.
 243                                  * For kernels equal-to and above 2.4, the
 244                                  * mid-layer will appearantly handle the
 245                                  * underflow by detecting the residual count --
 246                                  * unfortunately, we do not see where this is
 247                                  * actually being done.  In the interim, we
 248                                  * will return DID_ERROR.
 249                                  */
 250                                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: "
 251                                         "Mid-layer Data underrun1, "
 252                                         "xferlen = 0x%x, "
 253                                         "residual = 0x%x\n", ha->host_no,
 254                                         cmd->device->channel,
 255                                         cmd->device->id,
 256                                         cmd->device->lun, __func__,
 257                                         scsi_bufflen(cmd), residual));
 258
 259                                 cmd->result = DID_ERROR << 16;
 260                         } else {
 261                                 cmd->result = DID_OK << 16;
 262                         }
 263                 }
 264                 break;
 265
 266         case SCS_DEVICE_LOGGED_OUT:
 267         case SCS_DEVICE_UNAVAILABLE:
 268                 /*
 269                  * Mark device missing so that we won't continue to
 270                  * send I/O to this device.  We should get a ddb
 271                  * state change AEN soon.
 272                  */
 273                 if (atomic_read(&ddb_entry->state) == DDB_STATE_ONLINE)
 274                         qla4xxx_mark_device_missing(ha, ddb_entry);
 275
 276                 cmd->result = DID_BUS_BUSY << 16;
 277                 break;
 278
 279         case SCS_QUEUE_FULL:
 280                 /*
 281                  * SCSI Mid-Layer handles device queue full
 282                  */
 283                 cmd->result = DID_OK << 16 | sts_entry->scsiStatus;
 284                 DEBUG2(printk("scsi%ld:%d:%d: %s: QUEUE FULL detected "
 285                               "compl=%02x, scsi=%02x, state=%02x, iFlags=%02x,"
 286                               " iResp=%02x\n", ha->host_no, cmd->device->id,
 287                               cmd->device->lun, __func__,
 288                               sts_entry->completionStatus,
 289                               sts_entry->scsiStatus, sts_entry->state_flags,
 290                               sts_entry->iscsiFlags,
 291                               sts_entry->iscsiResponse));
 292                 break;
 293
 294         default:
 295                 cmd->result = DID_ERROR << 16;
 296                 break;
 297         }
 298
 299 status_entry_exit:
 300
 301         /* complete the request */
 302         srb->cc_stat = sts_entry->completionStatus;
 303         qla4xxx_srb_compl(ha, srb);
 304 }
 305
 306 /**
 307  * qla4xxx_process_response_queue - process response queue completions
 308  * @ha: Pointer to host adapter structure.
 309  *
 310  * This routine process response queue completions in interrupt context.
 311  * Hardware_lock locked upon entry
 312  **/
 313 static void qla4xxx_process_response_queue(struct scsi_qla_host * ha)
 314 {
 315         uint32_t count = 0;
 316         struct srb *srb = NULL;
 317         struct status_entry *sts_entry;
 318
 319         /* Process all responses from response queue */
 320         while ((ha->response_in =
 321                 (uint16_t)le32_to_cpu(ha->shadow_regs->rsp_q_in)) !=
 322                ha->response_out) {
 323                 sts_entry = (struct status_entry *) ha->response_ptr;
 324                 count++;
 325
 326                 /* Advance pointers for next entry */
 327                 if (ha->response_out == (RESPONSE_QUEUE_DEPTH - 1)) {
 328                         ha->response_out = 0;
 329                         ha->response_ptr = ha->response_ring;
 330                 } else {
 331                         ha->response_out++;
 332                         ha->response_ptr++;
 333                 }
 334
 335                 /* process entry */
 336                 switch (sts_entry->hdr.entryType) {
 337                 case ET_STATUS:
 338                         /*
 339                          * Common status - Single completion posted in single
 340                          * IOSB.
 341                          */
 342                         qla4xxx_status_entry(ha, sts_entry);
 343                         break;
 344
 345                 case ET_PASSTHRU_STATUS:
 346                         break;
 347
 348                 case ET_STATUS_CONTINUATION:
 349                         /* Just throw away the status continuation entries */
 350                         DEBUG2(printk("scsi%ld: %s: Status Continuation entry "
 351                                       "- ignoring\n", ha->host_no, __func__));
 352                         break;
 353
 354                 case ET_COMMAND:
 355                         /* ISP device queue is full. Command not
 356                          * accepted by ISP.  Queue command for
 357                          * later */
 358
 359                         srb = qla4xxx_del_from_active_array(ha,
 360                                                     le32_to_cpu(sts_entry->
 361                                                                 handle));
 362                         if (srb == NULL)
 363                                 goto exit_prq_invalid_handle;
 364
 365                         DEBUG2(printk("scsi%ld: %s: FW device queue full, "
 366                                       "srb %p\n", ha->host_no, __func__, srb));
 367
 368                         /* ETRY normally by sending it back with
 369                          * DID_BUS_BUSY */
 370                         srb->cmd->result = DID_BUS_BUSY << 16;
 371                         qla4xxx_srb_compl(ha, srb);
 372                         break;
 373
 374                 case ET_CONTINUE:
 375                         /* Just throw away the continuation entries */
 376                         DEBUG2(printk("scsi%ld: %s: Continuation entry - "
 377                                       "ignoring\n", ha->host_no, __func__));
 378                         break;
 379
 380                 default:
 381                         /*
 382                          * Invalid entry in response queue, reset RISC
 383                          * firmware.
 384                          */
 385                         DEBUG2(printk("scsi%ld: %s: Invalid entry %x in "
 386                                       "response queue \n", ha->host_no,
 387                                       __func__,
 388                                       sts_entry->hdr.entryType));
 389                         goto exit_prq_error;
 390                 }
 391         }
 392
 393         /*
 394          * Done with responses, update the ISP For QLA4010, this also clears
 395          * the interrupt.
 396          */
 397         writel(ha->response_out, &ha->reg->rsp_q_out);
 398         readl(&ha->reg->rsp_q_out);
 399
 400         return;
 401
 402 exit_prq_invalid_handle:
 403         DEBUG2(printk("scsi%ld: %s: Invalid handle(srb)=%p type=%x IOCS=%x\n",
 404                       ha->host_no, __func__, srb, sts_entry->hdr.entryType,
 405                       sts_entry->completionStatus));
 406
 407 exit_prq_error:
 408         writel(ha->response_out, &ha->reg->rsp_q_out);
 409         readl(&ha->reg->rsp_q_out);
 410
 411         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 412 }
 413
 414 /**
 415  * qla4xxx_isr_decode_mailbox - decodes mailbox status
 416  * @ha: Pointer to host adapter structure.
 417  * @mailbox_status: Mailbox status.
 418  *
 419  * This routine decodes the mailbox status during the ISR.
 420  * Hardware_lock locked upon entry. runs in interrupt context.
 421  **/
 422 static void qla4xxx_isr_decode_mailbox(struct scsi_qla_host * ha,
 423                                        uint32_t mbox_status)
 424 {
 425         int i;
 426         uint32_t mbox_stat2, mbox_stat3;
 427
 428         if ((mbox_status == MBOX_STS_BUSY) ||
 429             (mbox_status == MBOX_STS_INTERMEDIATE_COMPLETION) ||
 430             (mbox_status >> 12 == MBOX_COMPLETION_STATUS)) {
 431                 ha->mbox_status[0] = mbox_status;
 432
 433                 if (test_bit(AF_MBOX_COMMAND, &ha->flags)) {
 434                         /*
 435                          * Copy all mailbox registers to a temporary
 436                          * location and set mailbox command done flag
 437                          */
 438                         for (i = 1; i < ha->mbox_status_count; i++)
 439                                 ha->mbox_status[i] =
 440                                         readl(&ha->reg->mailbox[i]);
 441
 442                         set_bit(AF_MBOX_COMMAND_DONE, &ha->flags);
 443                 }
 444         } else if (mbox_status >> 12 == MBOX_ASYNC_EVENT_STATUS) {
 445                 /* Immediately process the AENs that don't require much work.
 446                  * Only queue the database_changed AENs */
 447                 if (ha->aen_log.count < MAX_AEN_ENTRIES) {
 448                         for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
 449                                 ha->aen_log.entry[ha->aen_log.count].mbox_sts[i] =
 450                                         readl(&ha->reg->mailbox[i]);
 451                         ha->aen_log.count++;
 452                 }
 453                 switch (mbox_status) {
 454                 case MBOX_ASTS_SYSTEM_ERROR:
 455                         /* Log Mailbox registers */
 456                         if (ql4xdontresethba) {
 457                                 DEBUG2(printk("%s:Dont Reset HBA\n",
 458                                               __func__));
 459                         } else {
 460                                 set_bit(AF_GET_CRASH_RECORD, &ha->flags);
 461                                 set_bit(DPC_RESET_HA, &ha->dpc_flags);
 462                         }
 463                         break;
 464
 465                 case MBOX_ASTS_REQUEST_TRANSFER_ERROR:
 466                 case MBOX_ASTS_RESPONSE_TRANSFER_ERROR:
 467                 case MBOX_ASTS_NVRAM_INVALID:
 468                 case MBOX_ASTS_IP_ADDRESS_CHANGED:
 469                 case MBOX_ASTS_DHCP_LEASE_EXPIRED:
 470                         DEBUG2(printk("scsi%ld: AEN %04x, ERROR Status, "
 471                                       "Reset HA\n", ha->host_no, mbox_status));
 472                         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 473                         break;
 474
 475                 case MBOX_ASTS_LINK_UP:
 476                         DEBUG2(printk("scsi%ld: AEN %04x Adapter LINK UP\n",
 477                                       ha->host_no, mbox_status));
 478                         set_bit(AF_LINK_UP, &ha->flags);
 479                         break;
 480
 481                 case MBOX_ASTS_LINK_DOWN:
 482                         DEBUG2(printk("scsi%ld: AEN %04x Adapter LINK DOWN\n",
 483                                       ha->host_no, mbox_status));
 484                         clear_bit(AF_LINK_UP, &ha->flags);
 485                         break;
 486
 487                 case MBOX_ASTS_HEARTBEAT:
 488                         ha->seconds_since_last_heartbeat = 0;
 489                         break;
 490
 491                 case MBOX_ASTS_DHCP_LEASE_ACQUIRED:
 492                         DEBUG2(printk("scsi%ld: AEN %04x DHCP LEASE "
 493                                       "ACQUIRED\n", ha->host_no, mbox_status));
 494                         set_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags);
 495                         break;
 496
 497                 case MBOX_ASTS_PROTOCOL_STATISTIC_ALARM:
 498                 case MBOX_ASTS_SCSI_COMMAND_PDU_REJECTED: /* Target
 499                                                            * mode
 500                                                            * only */
 501                 case MBOX_ASTS_UNSOLICITED_PDU_RECEIVED:  /* Connection mode */
 502                 case MBOX_ASTS_IPSEC_SYSTEM_FATAL_ERROR:
 503                 case MBOX_ASTS_SUBNET_STATE_CHANGE:
 504                         /* No action */
 505                         DEBUG2(printk("scsi%ld: AEN %04x\n", ha->host_no,
 506                                       mbox_status));
 507                         break;
 508
 509                 case MBOX_ASTS_IP_ADDR_STATE_CHANGED:
 510                         mbox_stat2 = readl(&ha->reg->mailbox[2]);
 511                         mbox_stat3 = readl(&ha->reg->mailbox[3]);
 512
 513                         if ((mbox_stat3 == 5) && (mbox_stat2 == 3))
 514                                 set_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags);
 515                         else if ((mbox_stat3 == 2) && (mbox_stat2 == 5))
 516                                 set_bit(DPC_RESET_HA, &ha->dpc_flags);
 517                         break;
 518
 519                 case MBOX_ASTS_MAC_ADDRESS_CHANGED:
 520                 case MBOX_ASTS_DNS:
 521                         /* No action */
 522                         DEBUG2(printk(KERN_INFO "scsi%ld: AEN %04x, "
 523                                       "mbox_sts[1]=%04x, mbox_sts[2]=%04x\n",
 524                                       ha->host_no, mbox_status,
 525                                       readl(&ha->reg->mailbox[1]),
 526                                       readl(&ha->reg->mailbox[2])));
 527                         break;
 528
 529                 case MBOX_ASTS_SELF_TEST_FAILED:
 530                 case MBOX_ASTS_LOGIN_FAILED:
 531                         /* No action */
 532                         DEBUG2(printk("scsi%ld: AEN %04x, mbox_sts[1]=%04x, "
 533                                       "mbox_sts[2]=%04x, mbox_sts[3]=%04x\n",
 534                                       ha->host_no, mbox_status,
 535                                       readl(&ha->reg->mailbox[1]),
 536                                       readl(&ha->reg->mailbox[2]),
 537                                       readl(&ha->reg->mailbox[3])));
 538                         break;
 539
 540                 case MBOX_ASTS_DATABASE_CHANGED:
 541                         /* Queue AEN information and process it in the DPC
 542                          * routine */
 543                         if (ha->aen_q_count > 0) {
 544
 545                                 /* decrement available counter */
 546                                 ha->aen_q_count--;
 547
 548                                 for (i = 1; i < MBOX_AEN_REG_COUNT; i++)
 549                                         ha->aen_q[ha->aen_in].mbox_sts[i] =
 550                                                 readl(&ha->reg->mailbox[i]);
 551
 552                                 ha->aen_q[ha->aen_in].mbox_sts[0] = mbox_status;
 553
 554                                 /* print debug message */
 555                                 DEBUG2(printk("scsi%ld: AEN[%d] %04x queued"
 556                                               " mb1:0x%x mb2:0x%x mb3:0x%x mb4:0x%x\n",
 557                                               ha->host_no, ha->aen_in,
 558                                               mbox_status,
 559                                               ha->aen_q[ha->aen_in].mbox_sts[1],
 560                                               ha->aen_q[ha->aen_in].mbox_sts[2],
 561                                               ha->aen_q[ha->aen_in].mbox_sts[3],
 562                                               ha->aen_q[ha->aen_in].  mbox_sts[4]));
 563                                 /* advance pointer */
 564                                 ha->aen_in++;
 565                                 if (ha->aen_in == MAX_AEN_ENTRIES)
 566                                         ha->aen_in = 0;
 567
 568                                 /* The DPC routine will process the aen */
 569                                 set_bit(DPC_AEN, &ha->dpc_flags);
 570                         } else {
 571                                 DEBUG2(printk("scsi%ld: %s: aen %04x, queue "
 572                                               "overflowed!  AEN LOST!!\n",
 573                                               ha->host_no, __func__,
 574                                               mbox_status));
 575
 576                                 DEBUG2(printk("scsi%ld: DUMP AEN QUEUE\n",
 577                                               ha->host_no));
 578
 579                                 for (i = 0; i < MAX_AEN_ENTRIES; i++) {
 580                                         DEBUG2(printk("AEN[%d] %04x %04x %04x "
 581                                                       "%04x\n", i,
 582                                                       ha->aen_q[i].mbox_sts[0],
 583                                                       ha->aen_q[i].mbox_sts[1],
 584                                                       ha->aen_q[i].mbox_sts[2],
 585                                                       ha->aen_q[i].mbox_sts[3]));
 586                                 }
 587                         }
 588                         break;
 589
 590                 default:
 591                         DEBUG2(printk(KERN_WARNING
 592                                       "scsi%ld: AEN %04x UNKNOWN\n",
 593                                       ha->host_no, mbox_status));
 594                         break;
 595                 }
 596         } else {
 597                 DEBUG2(printk("scsi%ld: Unknown mailbox status %08X\n",
 598                               ha->host_no, mbox_status));
 599
 600                 ha->mbox_status[0] = mbox_status;
 601         }
 602 }
 603
 604 /**
 605  * qla4xxx_interrupt_service_routine - isr
 606  * @ha: pointer to host adapter structure.
 607  *
 608  * This is the main interrupt service routine.
 609  * hardware_lock locked upon entry. runs in interrupt context.
 610  **/
 611 void qla4xxx_interrupt_service_routine(struct scsi_qla_host * ha,
 612                                        uint32_t intr_status)
 613 {
 614         /* Process response queue interrupt. */
 615         if (intr_status & CSR_SCSI_COMPLETION_INTR)
 616                 qla4xxx_process_response_queue(ha);
 617
 618         /* Process mailbox/asynch event  interrupt.*/
 619         if (intr_status & CSR_SCSI_PROCESSOR_INTR) {
 620                 qla4xxx_isr_decode_mailbox(ha,
 621                                            readl(&ha->reg->mailbox[0]));
 622
 623                 /* Clear Mailbox Interrupt */
 624                 writel(set_rmask(CSR_SCSI_PROCESSOR_INTR),
 625                        &ha->reg->ctrl_status);
 626                 readl(&ha->reg->ctrl_status);
 627         }
 628 }
 629
 630 /**
 631  * qla4xxx_intr_handler - hardware interrupt handler.
 632  * @irq: Unused
 633  * @dev_id: Pointer to host adapter structure
 634  **/
 635 irqreturn_t qla4xxx_intr_handler(int irq, void *dev_id)
 636 {
 637         struct scsi_qla_host *ha;
 638         uint32_t intr_status;
 639         unsigned long flags = 0;
 640         uint8_t reqs_count = 0;
 641
 642         ha = (struct scsi_qla_host *) dev_id;
 643         if (!ha) {
 644                 DEBUG2(printk(KERN_INFO
 645                               "qla4xxx: Interrupt with NULL host ptr\n"));
 646                 return IRQ_NONE;
 647         }
 648
 649         spin_lock_irqsave(&ha->hardware_lock, flags);
 650
 651         ha->isr_count++;
 652         /*
 653          * Repeatedly service interrupts up to a maximum of
 654          * MAX_REQS_SERVICED_PER_INTR
 655          */
 656         while (1) {
 657                 /*
 658                  * Read interrupt status
 659                  */
 660                 if (le32_to_cpu(ha->shadow_regs->rsp_q_in) !=
 661                     ha->response_out)
 662                         intr_status = CSR_SCSI_COMPLETION_INTR;
 663                 else
 664                         intr_status = readl(&ha->reg->ctrl_status);
 665
 666                 if ((intr_status &
 667                      (CSR_SCSI_RESET_INTR|CSR_FATAL_ERROR|INTR_PENDING)) ==
 668                     0) {
 669                         if (reqs_count == 0)
 670                                 ha->spurious_int_count++;
 671                         break;
 672                 }
 673
 674                 if (intr_status & CSR_FATAL_ERROR) {
 675                         DEBUG2(printk(KERN_INFO "scsi%ld: Fatal Error, "
 676                                       "Status 0x%04x\n", ha->host_no,
 677                                       readl(isp_port_error_status (ha))));
 678
 679                         /* Issue Soft Reset to clear this error condition.
 680                          * This will prevent the RISC from repeatedly
 681                          * interrupting the driver; thus, allowing the DPC to
 682                          * get scheduled to continue error recovery.
 683                          * NOTE: Disabling RISC interrupts does not work in
 684                          * this case, as CSR_FATAL_ERROR overrides
 685                          * CSR_SCSI_INTR_ENABLE */
 686                         if ((readl(&ha->reg->ctrl_status) &
 687                              CSR_SCSI_RESET_INTR) == 0) {
 688                                 writel(set_rmask(CSR_SOFT_RESET),
 689                                        &ha->reg->ctrl_status);
 690                                 readl(&ha->reg->ctrl_status);
 691                         }
 692
 693                         writel(set_rmask(CSR_FATAL_ERROR),
 694                                &ha->reg->ctrl_status);
 695                         readl(&ha->reg->ctrl_status);
 696
 697                         __qla4xxx_disable_intrs(ha);
 698
 699                         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 700
 701                         break;
 702                 } else if (intr_status & CSR_SCSI_RESET_INTR) {
 703                         clear_bit(AF_ONLINE, &ha->flags);
 704                         __qla4xxx_disable_intrs(ha);
 705
 706                         writel(set_rmask(CSR_SCSI_RESET_INTR),
 707                                &ha->reg->ctrl_status);
 708                         readl(&ha->reg->ctrl_status);
 709
 710                         if (!ql4_mod_unload)
 711                                 set_bit(DPC_RESET_HA_INTR, &ha->dpc_flags);
 712
 713                         break;
 714                 } else if (intr_status & INTR_PENDING) {
 715                         qla4xxx_interrupt_service_routine(ha, intr_status);
 716                         ha->total_io_count++;
 717                         if (++reqs_count == MAX_REQS_SERVICED_PER_INTR)
 718                                 break;
 719
 720                         intr_status = 0;
 721                 }
 722         }
 723
 724         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 725
 726         return IRQ_HANDLED;
 727 }
 728
 729 /**
 730  * qla4xxx_process_aen - processes AENs generated by firmware
 731  * @ha: pointer to host adapter structure.
 732  * @process_aen: type of AENs to process
 733  *
 734  * Processes specific types of Asynchronous Events generated by firmware.
 735  * The type of AENs to process is specified by process_aen and can be
 736  *      PROCESS_ALL_AENS         0
 737  *      FLUSH_DDB_CHANGED_AENS   1
 738  *      RELOGIN_DDB_CHANGED_AENS 2
 739  **/
 740 void qla4xxx_process_aen(struct scsi_qla_host * ha, uint8_t process_aen)
 741 {
 742         uint32_t mbox_sts[MBOX_AEN_REG_COUNT];
 743         struct aen *aen;
 744         int i;
 745         unsigned long flags;
 746
 747         spin_lock_irqsave(&ha->hardware_lock, flags);
 748         while (ha->aen_out != ha->aen_in) {
 749                 aen = &ha->aen_q[ha->aen_out];
 750                 /* copy aen information to local structure */
 751                 for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
 752                         mbox_sts[i] = aen->mbox_sts[i];
 753
 754                 ha->aen_q_count++;
 755                 ha->aen_out++;
 756
 757                 if (ha->aen_out == MAX_AEN_ENTRIES)
 758                         ha->aen_out = 0;
 759
 760                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 761
 762                 DEBUG2(printk("qla4xxx(%ld): AEN[%d]=0x%08x, mbx1=0x%08x mbx2=0x%08x"
 763                         " mbx3=0x%08x mbx4=0x%08x\n", ha->host_no,
 764                         (ha->aen_out ? (ha->aen_out-1): (MAX_AEN_ENTRIES-1)),
 765                         mbox_sts[0], mbox_sts[1], mbox_sts[2],
 766                         mbox_sts[3], mbox_sts[4]));
 767
 768                 switch (mbox_sts[0]) {
 769                 case MBOX_ASTS_DATABASE_CHANGED:
 770                         if (process_aen == FLUSH_DDB_CHANGED_AENS) {
 771                                 DEBUG2(printk("scsi%ld: AEN[%d] %04x, index "
 772                                               "[%d] state=%04x FLUSHED!\n",
 773                                               ha->host_no, ha->aen_out,
 774                                               mbox_sts[0], mbox_sts[2],
 775                                               mbox_sts[3]));
 776                                 break;
 777                         } else if (process_aen == RELOGIN_DDB_CHANGED_AENS) {
 778                                 /* for use during init time, we only want to
 779                                  * relogin non-active ddbs */
 780                                 struct ddb_entry *ddb_entry;
 781
 782                                 ddb_entry =
 783                                         /* FIXME: name length? */
 784                                         qla4xxx_lookup_ddb_by_fw_index(ha,
 785                                                                        mbox_sts[2]);
 786                                 if (!ddb_entry)
 787                                         break;
 788
 789                                 ddb_entry->dev_scan_wait_to_complete_relogin =
 790                                         0;
 791                                 ddb_entry->dev_scan_wait_to_start_relogin =
 792                                         jiffies +
 793                                         ((ddb_entry->default_time2wait +
 794                                           4) * HZ);
 795
 796                                 DEBUG2(printk("scsi%ld: ddb index [%d] initate"
 797                                               " RELOGIN after %d seconds\n",
 798                                               ha->host_no,
 799                                               ddb_entry->fw_ddb_index,
 800                                               ddb_entry->default_time2wait +
 801                                               4));
 802                                 break;
 803                         }
 804
 805                         if (mbox_sts[1] == 0) { /* Global DB change. */
 806                                 qla4xxx_reinitialize_ddb_list(ha);
 807                         } else if (mbox_sts[1] == 1) {  /* Specific device. */
 808                                 qla4xxx_process_ddb_changed(ha, mbox_sts[2],
 809                                                             mbox_sts[3]);
 810                         }
 811                         break;
 812                 }
 813                 spin_lock_irqsave(&ha->hardware_lock, flags);
 814         }
 815         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 816 }
 817