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
  10 /**
  11  * qla2x00_process_completed_request() - Process a Fast Post response.
  12  * @ha: SCSI driver HA context
  13  * @index: SRB index
  14  **/
  15 static void qla4xxx_process_completed_request(struct scsi_qla_host *ha,
  16                                               uint32_t index)
  17 {
  18         struct srb *srb;
  19
  20         srb = qla4xxx_del_from_active_array(ha, index);
  21         if (srb) {
  22                 /* Save ISP completion status */
  23                 srb->cmd->result = DID_OK << 16;
  24                 qla4xxx_srb_compl(ha, srb);
  25         } else {
  26                 DEBUG2(printk("scsi%ld: Invalid ISP SCSI completion handle = "
  27                               "%d\n", ha->host_no, index));
  28                 set_bit(DPC_RESET_HA, &ha->dpc_flags);
  29         }
  30 }
  31
  32 /**
  33  * qla4xxx_status_entry - processes status IOCBs
  34  * @ha: Pointer to host adapter structure.
  35  * @sts_entry: Pointer to status entry structure.
  36  **/
  37 static void qla4xxx_status_entry(struct scsi_qla_host *ha,
  38                                  struct status_entry *sts_entry)
  39 {
  40         uint8_t scsi_status;
  41         struct scsi_cmnd *cmd;
  42         struct srb *srb;
  43         struct ddb_entry *ddb_entry;
  44         uint32_t residual;
  45         uint16_t sensebytecnt;
  46
  47         if (sts_entry->completionStatus == SCS_COMPLETE &&
  48             sts_entry->scsiStatus == 0) {
  49                 qla4xxx_process_completed_request(ha,
  50                                                   le32_to_cpu(sts_entry->
  51                                                               handle));
  52                 return;
  53         }
  54
  55         srb = qla4xxx_del_from_active_array(ha, le32_to_cpu(sts_entry->handle));
  56         if (!srb) {
  57                 /* FIXMEdg: Don't we need to reset ISP in this case??? */
  58                 DEBUG2(printk(KERN_WARNING "scsi%ld: %s: Status Entry invalid "
  59                               "handle 0x%x, sp=%p. This cmd may have already "
  60                               "been completed.\n", ha->host_no, __func__,
  61                               le32_to_cpu(sts_entry->handle), srb));
  62                 return;
  63         }
  64
  65         cmd = srb->cmd;
  66         if (cmd == NULL) {
  67                 DEBUG2(printk("scsi%ld: %s: Command already returned back to "
  68                               "OS pkt->handle=%d srb=%p srb->state:%d\n",
  69                               ha->host_no, __func__, sts_entry->handle,
  70                               srb, srb->state));
  71                 dev_warn(&ha->pdev->dev, "Command is NULL:"
  72                         " already returned to OS (srb=%p)\n", srb);
  73                 return;
  74         }
  75
  76         ddb_entry = srb->ddb;
  77         if (ddb_entry == NULL) {
  78                 cmd->result = DID_NO_CONNECT << 16;
  79                 goto status_entry_exit;
  80         }
  81
  82         residual = le32_to_cpu(sts_entry->residualByteCnt);
  83
  84         /* Translate ISP error to a Linux SCSI error. */
  85         scsi_status = sts_entry->scsiStatus;
  86         switch (sts_entry->completionStatus) {
  87         case SCS_COMPLETE:
  88                 if (scsi_status == 0) {
  89                         cmd->result = DID_OK << 16;
  90                         break;
  91                 }
  92
  93                 if (sts_entry->iscsiFlags &
  94                     (ISCSI_FLAG_RESIDUAL_OVER|ISCSI_FLAG_RESIDUAL_UNDER))
  95                         cmd->resid = residual;
  96
  97                 cmd->result = DID_OK << 16 | scsi_status;
  98
  99                 if (scsi_status != SCSI_CHECK_CONDITION)
 100                         break;
 101
 102                 /* Copy Sense Data into sense buffer. */
 103                 memset(cmd->sense_buffer, 0, sizeof(cmd->sense_buffer));
 104
 105                 sensebytecnt = le16_to_cpu(sts_entry->senseDataByteCnt);
 106                 if (sensebytecnt == 0)
 107                         break;
 108
 109                 memcpy(cmd->sense_buffer, sts_entry->senseData,
 110                        min(sensebytecnt,
 111                            (uint16_t) sizeof(cmd->sense_buffer)));
 112
 113                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: sense key = %x, "
 114                               "ASC/ASCQ = %02x/%02x\n", ha->host_no,
 115                               cmd->device->channel, cmd->device->id,
 116                               cmd->device->lun, __func__,
 117                               sts_entry->senseData[2] & 0x0f,
 118                               sts_entry->senseData[12],
 119                               sts_entry->senseData[13]));
 120
 121                 srb->flags |= SRB_GOT_SENSE;
 122                 break;
 123
 124         case SCS_INCOMPLETE:
 125                 /* Always set the status to DID_ERROR, since
 126                  * all conditions result in that status anyway */
 127                 cmd->result = DID_ERROR << 16;
 128                 break;
 129
 130         case SCS_RESET_OCCURRED:
 131                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: Device RESET occurred\n",
 132                               ha->host_no, cmd->device->channel,
 133                               cmd->device->id, cmd->device->lun, __func__));
 134
 135                 cmd->result = DID_RESET << 16;
 136                 break;
 137
 138         case SCS_ABORTED:
 139                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: Abort occurred\n",
 140                               ha->host_no, cmd->device->channel,
 141                               cmd->device->id, cmd->device->lun, __func__));
 142
 143                 cmd->result = DID_RESET << 16;
 144                 break;
 145
 146         case SCS_TIMEOUT:
 147                 DEBUG2(printk(KERN_INFO "scsi%ld:%d:%d:%d: Timeout\n",
 148                               ha->host_no, cmd->device->channel,
 149                               cmd->device->id, cmd->device->lun));
 150
 151                 cmd->result = DID_BUS_BUSY << 16;
 152
 153                 /*
 154                  * Mark device missing so that we won't continue to send
 155                  * I/O to this device.  We should get a ddb state change
 156                  * AEN soon.
 157                  */
 158                 if (atomic_read(&ddb_entry->state) == DDB_STATE_ONLINE)
 159                         qla4xxx_mark_device_missing(ha, ddb_entry);
 160                 break;
 161
 162         case SCS_DATA_UNDERRUN:
 163         case SCS_DATA_OVERRUN:
 164                 if (sts_entry->iscsiFlags & ISCSI_FLAG_RESIDUAL_OVER) {
 165                         DEBUG2(printk("scsi%ld:%d:%d:%d: %s: " "Data overrun, "
 166                                       "residual = 0x%x\n", ha->host_no,
 167                                       cmd->device->channel, cmd->device->id,
 168                                       cmd->device->lun, __func__, residual));
 169
 170                         cmd->result = DID_ERROR << 16;
 171                         break;
 172                 }
 173
 174                 if ((sts_entry->iscsiFlags & ISCSI_FLAG_RESIDUAL_UNDER) == 0) {
 175                         /*
 176                          * Firmware detected a SCSI transport underrun
 177                          * condition
 178                          */
 179                         cmd->resid = residual;
 180                         DEBUG2(printk("scsi%ld:%d:%d:%d: %s: UNDERRUN status "
 181                                       "detected, xferlen = 0x%x, residual = "
 182                                       "0x%x\n",
 183                                       ha->host_no, cmd->device->channel,
 184                                       cmd->device->id,
 185                                       cmd->device->lun, __func__,
 186                                       cmd->request_bufflen,
 187                                       residual));
 188                 }
 189
 190                 /*
 191                  * If there is scsi_status, it takes precedense over
 192                  * underflow condition.
 193                  */
 194                 if (scsi_status != 0) {
 195                         cmd->result = DID_OK << 16 | scsi_status;
 196
 197                         if (scsi_status != SCSI_CHECK_CONDITION)
 198                                 break;
 199
 200                         /* Copy Sense Data into sense buffer. */
 201                         memset(cmd->sense_buffer, 0,
 202                                sizeof(cmd->sense_buffer));
 203
 204                         sensebytecnt =
 205                                 le16_to_cpu(sts_entry->senseDataByteCnt);
 206                         if (sensebytecnt == 0)
 207                                 break;
 208
 209                         memcpy(cmd->sense_buffer, sts_entry->senseData,
 210                                min(sensebytecnt,
 211                                    (uint16_t) sizeof(cmd->sense_buffer)));
 212
 213                         DEBUG2(printk("scsi%ld:%d:%d:%d: %s: sense key = %x, "
 214                                       "ASC/ASCQ = %02x/%02x\n", ha->host_no,
 215                                       cmd->device->channel, cmd->device->id,
 216                                       cmd->device->lun, __func__,
 217                                       sts_entry->senseData[2] & 0x0f,
 218                                       sts_entry->senseData[12],
 219                                       sts_entry->senseData[13]));
 220                 } else {
 221                         /*
 222                          * If RISC reports underrun and target does not
 223                          * report it then we must have a lost frame, so
 224                          * tell upper layer to retry it by reporting a
 225                          * bus busy.
 226                          */
 227                         if ((sts_entry->iscsiFlags &
 228                              ISCSI_FLAG_RESIDUAL_UNDER) == 0) {
 229                                 cmd->result = DID_BUS_BUSY << 16;
 230                         } else if ((cmd->request_bufflen - residual) <
 231                                    cmd->underflow) {
 232                                 /*
 233                                  * Handle mid-layer underflow???
 234                                  *
 235                                  * For kernels less than 2.4, the driver must
 236                                  * return an error if an underflow is detected.
 237                                  * For kernels equal-to and above 2.4, the
 238                                  * mid-layer will appearantly handle the
 239                                  * underflow by detecting the residual count --
 240                                  * unfortunately, we do not see where this is
 241                                  * actually being done.  In the interim, we
 242                                  * will return DID_ERROR.
 243                                  */
 244                                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: "
 245                                               "Mid-layer Data underrun, "
 246                                               "xferlen = 0x%x, "
 247                                               "residual = 0x%x\n", ha->host_no,
 248                                               cmd->device->channel,
 249                                               cmd->device->id,
 250                                               cmd->device->lun, __func__,
 251                                               cmd->request_bufflen, residual));
 252
 253                                 cmd->result = DID_ERROR << 16;
 254                         } else {
 255                                 cmd->result = DID_OK << 16;
 256                         }
 257                 }
 258                 break;
 259
 260         case SCS_DEVICE_LOGGED_OUT:
 261         case SCS_DEVICE_UNAVAILABLE:
 262                 /*
 263                  * Mark device missing so that we won't continue to
 264                  * send I/O to this device.  We should get a ddb
 265                  * state change AEN soon.
 266                  */
 267                 if (atomic_read(&ddb_entry->state) == DDB_STATE_ONLINE)
 268                         qla4xxx_mark_device_missing(ha, ddb_entry);
 269
 270                 cmd->result = DID_BUS_BUSY << 16;
 271                 break;
 272
 273         case SCS_QUEUE_FULL:
 274                 /*
 275                  * SCSI Mid-Layer handles device queue full
 276                  */
 277                 cmd->result = DID_OK << 16 | sts_entry->scsiStatus;
 278                 DEBUG2(printk("scsi%ld:%d:%d: %s: QUEUE FULL detected "
 279                               "compl=%02x, scsi=%02x, state=%02x, iFlags=%02x,"
 280                               " iResp=%02x\n", ha->host_no, cmd->device->id,
 281                               cmd->device->lun, __func__,
 282                               sts_entry->completionStatus,
 283                               sts_entry->scsiStatus, sts_entry->state_flags,
 284                               sts_entry->iscsiFlags,
 285                               sts_entry->iscsiResponse));
 286                 break;
 287
 288         default:
 289                 cmd->result = DID_ERROR << 16;
 290                 break;
 291         }
 292
 293 status_entry_exit:
 294
 295         /* complete the request */
 296         srb->cc_stat = sts_entry->completionStatus;
 297         qla4xxx_srb_compl(ha, srb);
 298 }
 299
 300 /**
 301  * qla4xxx_process_response_queue - process response queue completions
 302  * @ha: Pointer to host adapter structure.
 303  *
 304  * This routine process response queue completions in interrupt context.
 305  * Hardware_lock locked upon entry
 306  **/
 307 static void qla4xxx_process_response_queue(struct scsi_qla_host * ha)
 308 {
 309         uint32_t count = 0;
 310         struct srb *srb = NULL;
 311         struct status_entry *sts_entry;
 312
 313         /* Process all responses from response queue */
 314         while ((ha->response_in =
 315                 (uint16_t)le32_to_cpu(ha->shadow_regs->rsp_q_in)) !=
 316                ha->response_out) {
 317                 sts_entry = (struct status_entry *) ha->response_ptr;
 318                 count++;
 319
 320                 /* Advance pointers for next entry */
 321                 if (ha->response_out == (RESPONSE_QUEUE_DEPTH - 1)) {
 322                         ha->response_out = 0;
 323                         ha->response_ptr = ha->response_ring;
 324                 } else {
 325                         ha->response_out++;
 326                         ha->response_ptr++;
 327                 }
 328
 329                 /* process entry */
 330                 switch (sts_entry->hdr.entryType) {
 331                 case ET_STATUS:
 332                         /*
 333                          * Common status - Single completion posted in single
 334                          * IOSB.
 335                          */
 336                         qla4xxx_status_entry(ha, sts_entry);
 337                         break;
 338
 339                 case ET_PASSTHRU_STATUS:
 340                         break;
 341
 342                 case ET_STATUS_CONTINUATION:
 343                         /* Just throw away the status continuation entries */
 344                         DEBUG2(printk("scsi%ld: %s: Status Continuation entry "
 345                                       "- ignoring\n", ha->host_no, __func__));
 346                         break;
 347
 348                 case ET_COMMAND:
 349                         /* ISP device queue is full. Command not
 350                          * accepted by ISP.  Queue command for
 351                          * later */
 352
 353                         srb = qla4xxx_del_from_active_array(ha,
 354                                                     le32_to_cpu(sts_entry->
 355                                                                 handle));
 356                         if (srb == NULL)
 357                                 goto exit_prq_invalid_handle;
 358
 359                         DEBUG2(printk("scsi%ld: %s: FW device queue full, "
 360                                       "srb %p\n", ha->host_no, __func__, srb));
 361
 362                         /* ETRY normally by sending it back with
 363                          * DID_BUS_BUSY */
 364                         srb->cmd->result = DID_BUS_BUSY << 16;
 365                         qla4xxx_srb_compl(ha, srb);
 366                         break;
 367
 368                 case ET_CONTINUE:
 369                         /* Just throw away the continuation entries */
 370                         DEBUG2(printk("scsi%ld: %s: Continuation entry - "
 371                                       "ignoring\n", ha->host_no, __func__));
 372                         break;
 373
 374                 default:
 375                         /*
 376                          * Invalid entry in response queue, reset RISC
 377                          * firmware.
 378                          */
 379                         DEBUG2(printk("scsi%ld: %s: Invalid entry %x in "
 380                                       "response queue \n", ha->host_no,
 381                                       __func__,
 382                                       sts_entry->hdr.entryType));
 383                         goto exit_prq_error;
 384                 }
 385         }
 386
 387         /*
 388          * Done with responses, update the ISP For QLA4010, this also clears
 389          * the interrupt.
 390          */
 391         writel(ha->response_out, &ha->reg->rsp_q_out);
 392         readl(&ha->reg->rsp_q_out);
 393
 394         return;
 395
 396 exit_prq_invalid_handle:
 397         DEBUG2(printk("scsi%ld: %s: Invalid handle(srb)=%p type=%x IOCS=%x\n",
 398                       ha->host_no, __func__, srb, sts_entry->hdr.entryType,
 399                       sts_entry->completionStatus));
 400
 401 exit_prq_error:
 402         writel(ha->response_out, &ha->reg->rsp_q_out);
 403         readl(&ha->reg->rsp_q_out);
 404
 405         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 406 }
 407
 408 /**
 409  * qla4xxx_isr_decode_mailbox - decodes mailbox status
 410  * @ha: Pointer to host adapter structure.
 411  * @mailbox_status: Mailbox status.
 412  *
 413  * This routine decodes the mailbox status during the ISR.
 414  * Hardware_lock locked upon entry. runs in interrupt context.
 415  **/
 416 static void qla4xxx_isr_decode_mailbox(struct scsi_qla_host * ha,
 417                                        uint32_t mbox_status)
 418 {
 419         int i;
 420
 421         if ((mbox_status == MBOX_STS_BUSY) ||
 422             (mbox_status == MBOX_STS_INTERMEDIATE_COMPLETION) ||
 423             (mbox_status >> 12 == MBOX_COMPLETION_STATUS)) {
 424                 ha->mbox_status[0] = mbox_status;
 425
 426                 if (test_bit(AF_MBOX_COMMAND, &ha->flags)) {
 427                         /*
 428                          * Copy all mailbox registers to a temporary
 429                          * location and set mailbox command done flag
 430                          */
 431                         for (i = 1; i < ha->mbox_status_count; i++)
 432                                 ha->mbox_status[i] =
 433                                         readl(&ha->reg->mailbox[i]);
 434
 435                         set_bit(AF_MBOX_COMMAND_DONE, &ha->flags);
 436                 }
 437         } else if (mbox_status >> 12 == MBOX_ASYNC_EVENT_STATUS) {
 438                 /* Immediately process the AENs that don't require much work.
 439                  * Only queue the database_changed AENs */
 440                 switch (mbox_status) {
 441                 case MBOX_ASTS_SYSTEM_ERROR:
 442                         /* Log Mailbox registers */
 443                         if (ql4xdontresethba) {
 444                                 DEBUG2(printk("%s:Dont Reset HBA\n",
 445                                               __func__));
 446                         } else {
 447                                 set_bit(AF_GET_CRASH_RECORD, &ha->flags);
 448                                 set_bit(DPC_RESET_HA, &ha->dpc_flags);
 449                         }
 450                         break;
 451
 452                 case MBOX_ASTS_REQUEST_TRANSFER_ERROR:
 453                 case MBOX_ASTS_RESPONSE_TRANSFER_ERROR:
 454                 case MBOX_ASTS_NVRAM_INVALID:
 455                 case MBOX_ASTS_IP_ADDRESS_CHANGED:
 456                 case MBOX_ASTS_DHCP_LEASE_EXPIRED:
 457                         DEBUG2(printk("scsi%ld: AEN %04x, ERROR Status, "
 458                                       "Reset HA\n", ha->host_no, mbox_status));
 459                         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 460                         break;
 461
 462                 case MBOX_ASTS_LINK_UP:
 463                         DEBUG2(printk("scsi%ld: AEN %04x Adapter LINK UP\n",
 464                                       ha->host_no, mbox_status));
 465                         set_bit(AF_LINK_UP, &ha->flags);
 466                         break;
 467
 468                 case MBOX_ASTS_LINK_DOWN:
 469                         DEBUG2(printk("scsi%ld: AEN %04x Adapter LINK DOWN\n",
 470                                       ha->host_no, mbox_status));
 471                         clear_bit(AF_LINK_UP, &ha->flags);
 472                         break;
 473
 474                 case MBOX_ASTS_HEARTBEAT:
 475                         ha->seconds_since_last_heartbeat = 0;
 476                         break;
 477
 478                 case MBOX_ASTS_DHCP_LEASE_ACQUIRED:
 479                         DEBUG2(printk("scsi%ld: AEN %04x DHCP LEASE "
 480                                       "ACQUIRED\n", ha->host_no, mbox_status));
 481                         set_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags);
 482                         break;
 483
 484                 case MBOX_ASTS_PROTOCOL_STATISTIC_ALARM:
 485                 case MBOX_ASTS_SCSI_COMMAND_PDU_REJECTED: /* Target
 486                                                            * mode
 487                                                            * only */
 488                 case MBOX_ASTS_UNSOLICITED_PDU_RECEIVED:  /* Connection mode */
 489                 case MBOX_ASTS_IPSEC_SYSTEM_FATAL_ERROR:
 490                 case MBOX_ASTS_SUBNET_STATE_CHANGE:
 491                         /* No action */
 492                         DEBUG2(printk("scsi%ld: AEN %04x\n", ha->host_no,
 493                                       mbox_status));
 494                         break;
 495
 496                 case MBOX_ASTS_MAC_ADDRESS_CHANGED:
 497                 case MBOX_ASTS_DNS:
 498                         /* No action */
 499                         DEBUG2(printk(KERN_INFO "scsi%ld: AEN %04x, "
 500                                       "mbox_sts[1]=%04x, mbox_sts[2]=%04x\n",
 501                                       ha->host_no, mbox_status,
 502                                       readl(&ha->reg->mailbox[1]),
 503                                       readl(&ha->reg->mailbox[2])));
 504                         break;
 505
 506                 case MBOX_ASTS_SELF_TEST_FAILED:
 507                 case MBOX_ASTS_LOGIN_FAILED:
 508                         /* No action */
 509                         DEBUG2(printk("scsi%ld: AEN %04x, mbox_sts[1]=%04x, "
 510                                       "mbox_sts[2]=%04x, mbox_sts[3]=%04x\n",
 511                                       ha->host_no, mbox_status,
 512                                       readl(&ha->reg->mailbox[1]),
 513                                       readl(&ha->reg->mailbox[2]),
 514                                       readl(&ha->reg->mailbox[3])));
 515                         break;
 516
 517                 case MBOX_ASTS_DATABASE_CHANGED:
 518                         /* Queue AEN information and process it in the DPC
 519                          * routine */
 520                         if (ha->aen_q_count > 0) {
 521                                 /* advance pointer */
 522                                 if (ha->aen_in == (MAX_AEN_ENTRIES - 1))
 523                                         ha->aen_in = 0;
 524                                 else
 525                                         ha->aen_in++;
 526
 527                                 /* decrement available counter */
 528                                 ha->aen_q_count--;
 529
 530                                 for (i = 1; i < MBOX_AEN_REG_COUNT; i++)
 531                                         ha->aen_q[ha->aen_in].mbox_sts[i] =
 532                                                 readl(&ha->reg->mailbox[i]);
 533
 534                                 ha->aen_q[ha->aen_in].mbox_sts[0] = mbox_status;
 535
 536                                 /* print debug message */
 537                                 DEBUG2(printk("scsi%ld: AEN[%d] %04x queued"
 538                                               " mb1:0x%x mb2:0x%x mb3:0x%x mb4:0x%x\n",
 539                                               ha->host_no, ha->aen_in,
 540                                               mbox_status,
 541                                               ha->aen_q[ha->aen_in].mbox_sts[1],
 542                                               ha->aen_q[ha->aen_in].mbox_sts[2],
 543                                               ha->aen_q[ha->aen_in].mbox_sts[3],
 544                                               ha->aen_q[ha->aen_in].  mbox_sts[4]));
 545
 546                                 /* The DPC routine will process the aen */
 547                                 set_bit(DPC_AEN, &ha->dpc_flags);
 548                         } else {
 549                                 DEBUG2(printk("scsi%ld: %s: aen %04x, queue "
 550                                               "overflowed!  AEN LOST!!\n",
 551                                               ha->host_no, __func__,
 552                                               mbox_status));
 553
 554                                 DEBUG2(printk("scsi%ld: DUMP AEN QUEUE\n",
 555                                               ha->host_no));
 556
 557                                 for (i = 0; i < MAX_AEN_ENTRIES; i++) {
 558                                         DEBUG2(printk("AEN[%d] %04x %04x %04x "
 559                                                       "%04x\n", i,
 560                                                       ha->aen_q[i].mbox_sts[0],
 561                                                       ha->aen_q[i].mbox_sts[1],
 562                                                       ha->aen_q[i].mbox_sts[2],
 563                                                       ha->aen_q[i].mbox_sts[3]));
 564                                 }
 565                         }
 566                         break;
 567
 568                 default:
 569                         DEBUG2(printk(KERN_WARNING
 570                                       "scsi%ld: AEN %04x UNKNOWN\n",
 571                                       ha->host_no, mbox_status));
 572                         break;
 573                 }
 574         } else {
 575                 DEBUG2(printk("scsi%ld: Unknown mailbox status %08X\n",
 576                               ha->host_no, mbox_status));
 577
 578                 ha->mbox_status[0] = mbox_status;
 579         }
 580 }
 581
 582 /**
 583  * qla4xxx_interrupt_service_routine - isr
 584  * @ha: pointer to host adapter structure.
 585  *
 586  * This is the main interrupt service routine.
 587  * hardware_lock locked upon entry. runs in interrupt context.
 588  **/
 589 void qla4xxx_interrupt_service_routine(struct scsi_qla_host * ha,
 590                                        uint32_t intr_status)
 591 {
 592         /* Process response queue interrupt. */
 593         if (intr_status & CSR_SCSI_COMPLETION_INTR)
 594                 qla4xxx_process_response_queue(ha);
 595
 596         /* Process mailbox/asynch event  interrupt.*/
 597         if (intr_status & CSR_SCSI_PROCESSOR_INTR) {
 598                 qla4xxx_isr_decode_mailbox(ha,
 599                                            readl(&ha->reg->mailbox[0]));
 600
 601                 /* Clear Mailbox Interrupt */
 602                 writel(set_rmask(CSR_SCSI_PROCESSOR_INTR),
 603                        &ha->reg->ctrl_status);
 604                 readl(&ha->reg->ctrl_status);
 605         }
 606 }
 607
 608 /**
 609  * qla4xxx_intr_handler - hardware interrupt handler.
 610  * @irq: Unused
 611  * @dev_id: Pointer to host adapter structure
 612  **/
 613 irqreturn_t qla4xxx_intr_handler(int irq, void *dev_id)
 614 {
 615         struct scsi_qla_host *ha;
 616         uint32_t intr_status;
 617         unsigned long flags = 0;
 618         uint8_t reqs_count = 0;
 619
 620         ha = (struct scsi_qla_host *) dev_id;
 621         if (!ha) {
 622                 DEBUG2(printk(KERN_INFO
 623                               "qla4xxx: Interrupt with NULL host ptr\n"));
 624                 return IRQ_NONE;
 625         }
 626
 627         spin_lock_irqsave(&ha->hardware_lock, flags);
 628
 629         ha->isr_count++;
 630         /*
 631          * Repeatedly service interrupts up to a maximum of
 632          * MAX_REQS_SERVICED_PER_INTR
 633          */
 634         while (1) {
 635                 /*
 636                  * Read interrupt status
 637                  */
 638                 if (le32_to_cpu(ha->shadow_regs->rsp_q_in) !=
 639                     ha->response_out)
 640                         intr_status = CSR_SCSI_COMPLETION_INTR;
 641                 else
 642                         intr_status = readl(&ha->reg->ctrl_status);
 643
 644                 if ((intr_status &
 645                      (CSR_SCSI_RESET_INTR|CSR_FATAL_ERROR|INTR_PENDING)) ==
 646                     0) {
 647                         if (reqs_count == 0)
 648                                 ha->spurious_int_count++;
 649                         break;
 650                 }
 651
 652                 if (intr_status & CSR_FATAL_ERROR) {
 653                         DEBUG2(printk(KERN_INFO "scsi%ld: Fatal Error, "
 654                                       "Status 0x%04x\n", ha->host_no,
 655                                       readl(isp_port_error_status (ha))));
 656
 657                         /* Issue Soft Reset to clear this error condition.
 658                          * This will prevent the RISC from repeatedly
 659                          * interrupting the driver; thus, allowing the DPC to
 660                          * get scheduled to continue error recovery.
 661                          * NOTE: Disabling RISC interrupts does not work in
 662                          * this case, as CSR_FATAL_ERROR overrides
 663                          * CSR_SCSI_INTR_ENABLE */
 664                         if ((readl(&ha->reg->ctrl_status) &
 665                              CSR_SCSI_RESET_INTR) == 0) {
 666                                 writel(set_rmask(CSR_SOFT_RESET),
 667                                        &ha->reg->ctrl_status);
 668                                 readl(&ha->reg->ctrl_status);
 669                         }
 670
 671                         writel(set_rmask(CSR_FATAL_ERROR),
 672                                &ha->reg->ctrl_status);
 673                         readl(&ha->reg->ctrl_status);
 674
 675                         __qla4xxx_disable_intrs(ha);
 676
 677                         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 678
 679                         break;
 680                 } else if (intr_status & CSR_SCSI_RESET_INTR) {
 681                         clear_bit(AF_ONLINE, &ha->flags);
 682                         __qla4xxx_disable_intrs(ha);
 683
 684                         writel(set_rmask(CSR_SCSI_RESET_INTR),
 685                                &ha->reg->ctrl_status);
 686                         readl(&ha->reg->ctrl_status);
 687
 688                         if (!ql4_mod_unload)
 689                                 set_bit(DPC_RESET_HA_INTR, &ha->dpc_flags);
 690
 691                         break;
 692                 } else if (intr_status & INTR_PENDING) {
 693                         qla4xxx_interrupt_service_routine(ha, intr_status);
 694                         ha->total_io_count++;
 695                         if (++reqs_count == MAX_REQS_SERVICED_PER_INTR)
 696                                 break;
 697
 698                         intr_status = 0;
 699                 }
 700         }
 701
 702         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 703
 704         return IRQ_HANDLED;
 705 }
 706
 707 /**
 708  * qla4xxx_process_aen - processes AENs generated by firmware
 709  * @ha: pointer to host adapter structure.
 710  * @process_aen: type of AENs to process
 711  *
 712  * Processes specific types of Asynchronous Events generated by firmware.
 713  * The type of AENs to process is specified by process_aen and can be
 714  *      PROCESS_ALL_AENS         0
 715  *      FLUSH_DDB_CHANGED_AENS   1
 716  *      RELOGIN_DDB_CHANGED_AENS 2
 717  **/
 718 void qla4xxx_process_aen(struct scsi_qla_host * ha, uint8_t process_aen)
 719 {
 720         uint32_t mbox_sts[MBOX_AEN_REG_COUNT];
 721         struct aen *aen;
 722         int i;
 723         unsigned long flags;
 724
 725         spin_lock_irqsave(&ha->hardware_lock, flags);
 726         while (ha->aen_out != ha->aen_in) {
 727                 /* Advance pointers for next entry */
 728                 if (ha->aen_out == (MAX_AEN_ENTRIES - 1))
 729                         ha->aen_out = 0;
 730                 else
 731                         ha->aen_out++;
 732
 733                 ha->aen_q_count++;
 734                 aen = &ha->aen_q[ha->aen_out];
 735
 736                 /* copy aen information to local structure */
 737                 for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
 738                         mbox_sts[i] = aen->mbox_sts[i];
 739
 740                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 741
 742                 DEBUG(printk("scsi%ld: AEN[%d] %04x, index [%d] state=%04x "
 743                              "mod=%x conerr=%08x \n", ha->host_no, ha->aen_out,
 744                              mbox_sts[0], mbox_sts[2], mbox_sts[3],
 745                              mbox_sts[1], mbox_sts[4]));
 746
 747                 switch (mbox_sts[0]) {
 748                 case MBOX_ASTS_DATABASE_CHANGED:
 749                         if (process_aen == FLUSH_DDB_CHANGED_AENS) {
 750                                 DEBUG2(printk("scsi%ld: AEN[%d] %04x, index "
 751                                               "[%d] state=%04x FLUSHED!\n",
 752                                               ha->host_no, ha->aen_out,
 753                                               mbox_sts[0], mbox_sts[2],
 754                                               mbox_sts[3]));
 755                                 break;
 756                         } else if (process_aen == RELOGIN_DDB_CHANGED_AENS) {
 757                                 /* for use during init time, we only want to
 758                                  * relogin non-active ddbs */
 759                                 struct ddb_entry *ddb_entry;
 760
 761                                 ddb_entry =
 762                                         /* FIXME: name length? */
 763                                         qla4xxx_lookup_ddb_by_fw_index(ha,
 764                                                                        mbox_sts[2]);
 765                                 if (!ddb_entry)
 766                                         break;
 767
 768                                 ddb_entry->dev_scan_wait_to_complete_relogin =
 769                                         0;
 770                                 ddb_entry->dev_scan_wait_to_start_relogin =
 771                                         jiffies +
 772                                         ((ddb_entry->default_time2wait +
 773                                           4) * HZ);
 774
 775                                 DEBUG2(printk("scsi%ld: ddb index [%d] initate"
 776                                               " RELOGIN after %d seconds\n",
 777                                               ha->host_no,
 778                                               ddb_entry->fw_ddb_index,
 779                                               ddb_entry->default_time2wait +
 780                                               4));
 781                                 break;
 782                         }
 783
 784                         if (mbox_sts[1] == 0) { /* Global DB change. */
 785                                 qla4xxx_reinitialize_ddb_list(ha);
 786                         } else if (mbox_sts[1] == 1) {  /* Specific device. */
 787                                 qla4xxx_process_ddb_changed(ha, mbox_sts[2],
 788                                                             mbox_sts[3]);
 789                         }
 790                         break;
 791                 }
 792                 spin_lock_irqsave(&ha->hardware_lock, flags);
 793         }
 794         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 795
 796 }
 797