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_status && ((scsi_bufflen(cmd) - residual) <
 104                                 cmd->underflow)) {
 105
 106                                 cmd->result = DID_ERROR << 16;
 107
 108                                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: "
 109                                         "Mid-layer Data underrun0, "
 110                                         "xferlen = 0x%x, "
 111                                         "residual = 0x%x\n", ha->host_no,
 112                                         cmd->device->channel,
 113                                         cmd->device->id,
 114                                         cmd->device->lun, __func__,
 115                                         scsi_bufflen(cmd), residual));
 116                                 break;
 117                         }
 118                 }
 119
 120                 cmd->result = DID_OK << 16 | scsi_status;
 121
 122                 if (scsi_status != SCSI_CHECK_CONDITION)
 123                         break;
 124
 125                 /* Copy Sense Data into sense buffer. */
 126                 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
 127
 128                 sensebytecnt = le16_to_cpu(sts_entry->senseDataByteCnt);
 129                 if (sensebytecnt == 0)
 130                         break;
 131
 132                 memcpy(cmd->sense_buffer, sts_entry->senseData,
 133                        min_t(uint16_t, sensebytecnt, SCSI_SENSE_BUFFERSIZE));
 134
 135                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: sense key = %x, "
 136                               "ASC/ASCQ = %02x/%02x\n", ha->host_no,
 137                               cmd->device->channel, cmd->device->id,
 138                               cmd->device->lun, __func__,
 139                               sts_entry->senseData[2] & 0x0f,
 140                               sts_entry->senseData[12],
 141                               sts_entry->senseData[13]));
 142
 143                 srb->flags |= SRB_GOT_SENSE;
 144                 break;
 145
 146         case SCS_INCOMPLETE:
 147                 /* Always set the status to DID_ERROR, since
 148                  * all conditions result in that status anyway */
 149                 cmd->result = DID_ERROR << 16;
 150                 break;
 151
 152         case SCS_RESET_OCCURRED:
 153                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: Device RESET occurred\n",
 154                               ha->host_no, cmd->device->channel,
 155                               cmd->device->id, cmd->device->lun, __func__));
 156
 157                 cmd->result = DID_RESET << 16;
 158                 break;
 159
 160         case SCS_ABORTED:
 161                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: Abort occurred\n",
 162                               ha->host_no, cmd->device->channel,
 163                               cmd->device->id, cmd->device->lun, __func__));
 164
 165                 cmd->result = DID_RESET << 16;
 166                 break;
 167
 168         case SCS_TIMEOUT:
 169                 DEBUG2(printk(KERN_INFO "scsi%ld:%d:%d:%d: Timeout\n",
 170                               ha->host_no, cmd->device->channel,
 171                               cmd->device->id, cmd->device->lun));
 172
 173                 cmd->result = DID_BUS_BUSY << 16;
 174
 175                 /*
 176                  * Mark device missing so that we won't continue to send
 177                  * I/O to this device.  We should get a ddb state change
 178                  * AEN soon.
 179                  */
 180                 if (atomic_read(&ddb_entry->state) == DDB_STATE_ONLINE)
 181                         qla4xxx_mark_device_missing(ha, ddb_entry);
 182                 break;
 183
 184         case SCS_DATA_UNDERRUN:
 185         case SCS_DATA_OVERRUN:
 186                 if ((sts_entry->iscsiFlags & ISCSI_FLAG_RESIDUAL_OVER) ||
 187                         (sts_entry->completionStatus == SCS_DATA_OVERRUN)) {
 188                         DEBUG2(printk("scsi%ld:%d:%d:%d: %s: " "Data overrun, "
 189                                       "residual = 0x%x\n", ha->host_no,
 190                                       cmd->device->channel, cmd->device->id,
 191                                       cmd->device->lun, __func__, residual));
 192
 193                         cmd->result = DID_ERROR << 16;
 194                         break;
 195                 }
 196
 197                 scsi_set_resid(cmd, residual);
 198
 199                 /*
 200                  * If there is scsi_status, it takes precedense over
 201                  * underflow condition.
 202                  */
 203                 if (scsi_status != 0) {
 204                         cmd->result = DID_OK << 16 | scsi_status;
 205
 206                         if (scsi_status != SCSI_CHECK_CONDITION)
 207                                 break;
 208
 209                         /* Copy Sense Data into sense buffer. */
 210                         memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
 211
 212                         sensebytecnt =
 213                                 le16_to_cpu(sts_entry->senseDataByteCnt);
 214                         if (sensebytecnt == 0)
 215                                 break;
 216
 217                         memcpy(cmd->sense_buffer, sts_entry->senseData,
 218                                min_t(uint16_t, sensebytecnt, SCSI_SENSE_BUFFERSIZE));
 219
 220                         DEBUG2(printk("scsi%ld:%d:%d:%d: %s: sense key = %x, "
 221                                       "ASC/ASCQ = %02x/%02x\n", ha->host_no,
 222                                       cmd->device->channel, cmd->device->id,
 223                                       cmd->device->lun, __func__,
 224                                       sts_entry->senseData[2] & 0x0f,
 225                                       sts_entry->senseData[12],
 226                                       sts_entry->senseData[13]));
 227                 } else {
 228                         /*
 229                          * If RISC reports underrun and target does not
 230                          * report it then we must have a lost frame, so
 231                          * tell upper layer to retry it by reporting a
 232                          * bus busy.
 233                          */
 234                         if ((sts_entry->iscsiFlags &
 235                              ISCSI_FLAG_RESIDUAL_UNDER) == 0) {
 236                                 cmd->result = DID_BUS_BUSY << 16;
 237                         } else if ((scsi_bufflen(cmd) - residual) <
 238                                    cmd->underflow) {
 239                                 /*
 240                                  * Handle mid-layer underflow???
 241                                  *
 242                                  * For kernels less than 2.4, the driver must
 243                                  * return an error if an underflow is detected.
 244                                  * For kernels equal-to and above 2.4, the
 245                                  * mid-layer will appearantly handle the
 246                                  * underflow by detecting the residual count --
 247                                  * unfortunately, we do not see where this is
 248                                  * actually being done.  In the interim, we
 249                                  * will return DID_ERROR.
 250                                  */
 251                                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: "
 252                                         "Mid-layer Data underrun1, "
 253                                         "xferlen = 0x%x, "
 254                                         "residual = 0x%x\n", ha->host_no,
 255                                         cmd->device->channel,
 256                                         cmd->device->id,
 257                                         cmd->device->lun, __func__,
 258                                         scsi_bufflen(cmd), residual));
 259
 260                                 cmd->result = DID_ERROR << 16;
 261                         } else {
 262                                 cmd->result = DID_OK << 16;
 263                         }
 264                 }
 265                 break;
 266
 267         case SCS_DEVICE_LOGGED_OUT:
 268         case SCS_DEVICE_UNAVAILABLE:
 269                 /*
 270                  * Mark device missing so that we won't continue to
 271                  * send I/O to this device.  We should get a ddb
 272                  * state change AEN soon.
 273                  */
 274                 if (atomic_read(&ddb_entry->state) == DDB_STATE_ONLINE)
 275                         qla4xxx_mark_device_missing(ha, ddb_entry);
 276
 277                 cmd->result = DID_BUS_BUSY << 16;
 278                 break;
 279
 280         case SCS_QUEUE_FULL:
 281                 /*
 282                  * SCSI Mid-Layer handles device queue full
 283                  */
 284                 cmd->result = DID_OK << 16 | sts_entry->scsiStatus;
 285                 DEBUG2(printk("scsi%ld:%d:%d: %s: QUEUE FULL detected "
 286                               "compl=%02x, scsi=%02x, state=%02x, iFlags=%02x,"
 287                               " iResp=%02x\n", ha->host_no, cmd->device->id,
 288                               cmd->device->lun, __func__,
 289                               sts_entry->completionStatus,
 290                               sts_entry->scsiStatus, sts_entry->state_flags,
 291                               sts_entry->iscsiFlags,
 292                               sts_entry->iscsiResponse));
 293                 break;
 294
 295         default:
 296                 cmd->result = DID_ERROR << 16;
 297                 break;
 298         }
 299
 300 status_entry_exit:
 301
 302         /* complete the request */
 303         srb->cc_stat = sts_entry->completionStatus;
 304         qla4xxx_srb_compl(ha, srb);
 305 }
 306
 307 /**
 308  * qla4xxx_process_response_queue - process response queue completions
 309  * @ha: Pointer to host adapter structure.
 310  *
 311  * This routine process response queue completions in interrupt context.
 312  * Hardware_lock locked upon entry
 313  **/
 314 static void qla4xxx_process_response_queue(struct scsi_qla_host * ha)
 315 {
 316         uint32_t count = 0;
 317         struct srb *srb = NULL;
 318         struct status_entry *sts_entry;
 319
 320         /* Process all responses from response queue */
 321         while ((ha->response_in =
 322                 (uint16_t)le32_to_cpu(ha->shadow_regs->rsp_q_in)) !=
 323                ha->response_out) {
 324                 sts_entry = (struct status_entry *) ha->response_ptr;
 325                 count++;
 326
 327                 /* Advance pointers for next entry */
 328                 if (ha->response_out == (RESPONSE_QUEUE_DEPTH - 1)) {
 329                         ha->response_out = 0;
 330                         ha->response_ptr = ha->response_ring;
 331                 } else {
 332                         ha->response_out++;
 333                         ha->response_ptr++;
 334                 }
 335
 336                 /* process entry */
 337                 switch (sts_entry->hdr.entryType) {
 338                 case ET_STATUS:
 339                         /*
 340                          * Common status - Single completion posted in single
 341                          * IOSB.
 342                          */
 343                         qla4xxx_status_entry(ha, sts_entry);
 344                         break;
 345
 346                 case ET_PASSTHRU_STATUS:
 347                         break;
 348
 349                 case ET_STATUS_CONTINUATION:
 350                         /* Just throw away the status continuation entries */
 351                         DEBUG2(printk("scsi%ld: %s: Status Continuation entry "
 352                                       "- ignoring\n", ha->host_no, __func__));
 353                         break;
 354
 355                 case ET_COMMAND:
 356                         /* ISP device queue is full. Command not
 357                          * accepted by ISP.  Queue command for
 358                          * later */
 359
 360                         srb = qla4xxx_del_from_active_array(ha,
 361                                                     le32_to_cpu(sts_entry->
 362                                                                 handle));
 363                         if (srb == NULL)
 364                                 goto exit_prq_invalid_handle;
 365
 366                         DEBUG2(printk("scsi%ld: %s: FW device queue full, "
 367                                       "srb %p\n", ha->host_no, __func__, srb));
 368
 369                         /* ETRY normally by sending it back with
 370                          * DID_BUS_BUSY */
 371                         srb->cmd->result = DID_BUS_BUSY << 16;
 372                         qla4xxx_srb_compl(ha, srb);
 373                         break;
 374
 375                 case ET_CONTINUE:
 376                         /* Just throw away the continuation entries */
 377                         DEBUG2(printk("scsi%ld: %s: Continuation entry - "
 378                                       "ignoring\n", ha->host_no, __func__));
 379                         break;
 380
 381                 default:
 382                         /*
 383                          * Invalid entry in response queue, reset RISC
 384                          * firmware.
 385                          */
 386                         DEBUG2(printk("scsi%ld: %s: Invalid entry %x in "
 387                                       "response queue \n", ha->host_no,
 388                                       __func__,
 389                                       sts_entry->hdr.entryType));
 390                         goto exit_prq_error;
 391                 }
 392         }
 393
 394         /*
 395          * Done with responses, update the ISP For QLA4010, this also clears
 396          * the interrupt.
 397          */
 398         writel(ha->response_out, &ha->reg->rsp_q_out);
 399         readl(&ha->reg->rsp_q_out);
 400
 401         return;
 402
 403 exit_prq_invalid_handle:
 404         DEBUG2(printk("scsi%ld: %s: Invalid handle(srb)=%p type=%x IOCS=%x\n",
 405                       ha->host_no, __func__, srb, sts_entry->hdr.entryType,
 406                       sts_entry->completionStatus));
 407
 408 exit_prq_error:
 409         writel(ha->response_out, &ha->reg->rsp_q_out);
 410         readl(&ha->reg->rsp_q_out);
 411
 412         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 413 }
 414
 415 /**
 416  * qla4xxx_isr_decode_mailbox - decodes mailbox status
 417  * @ha: Pointer to host adapter structure.
 418  * @mailbox_status: Mailbox status.
 419  *
 420  * This routine decodes the mailbox status during the ISR.
 421  * Hardware_lock locked upon entry. runs in interrupt context.
 422  **/
 423 static void qla4xxx_isr_decode_mailbox(struct scsi_qla_host * ha,
 424                                        uint32_t mbox_status)
 425 {
 426         int i;
 427         uint32_t mbox_stat2, mbox_stat3;
 428
 429         if ((mbox_status == MBOX_STS_BUSY) ||
 430             (mbox_status == MBOX_STS_INTERMEDIATE_COMPLETION) ||
 431             (mbox_status >> 12 == MBOX_COMPLETION_STATUS)) {
 432                 ha->mbox_status[0] = mbox_status;
 433
 434                 if (test_bit(AF_MBOX_COMMAND, &ha->flags)) {
 435                         /*
 436                          * Copy all mailbox registers to a temporary
 437                          * location and set mailbox command done flag
 438                          */
 439                         for (i = 1; i < ha->mbox_status_count; i++)
 440                                 ha->mbox_status[i] =
 441                                         readl(&ha->reg->mailbox[i]);
 442
 443                         set_bit(AF_MBOX_COMMAND_DONE, &ha->flags);
 444                 }
 445         } else if (mbox_status >> 12 == MBOX_ASYNC_EVENT_STATUS) {
 446                 /* Immediately process the AENs that don't require much work.
 447                  * Only queue the database_changed AENs */
 448                 if (ha->aen_log.count < MAX_AEN_ENTRIES) {
 449                         for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
 450                                 ha->aen_log.entry[ha->aen_log.count].mbox_sts[i] =
 451                                         readl(&ha->reg->mailbox[i]);
 452                         ha->aen_log.count++;
 453                 }
 454                 switch (mbox_status) {
 455                 case MBOX_ASTS_SYSTEM_ERROR:
 456                         /* Log Mailbox registers */
 457                         if (ql4xdontresethba) {
 458                                 DEBUG2(printk("%s:Dont Reset HBA\n",
 459                                               __func__));
 460                         } else {
 461                                 set_bit(AF_GET_CRASH_RECORD, &ha->flags);
 462                                 set_bit(DPC_RESET_HA, &ha->dpc_flags);
 463                         }
 464                         break;
 465
 466                 case MBOX_ASTS_REQUEST_TRANSFER_ERROR:
 467                 case MBOX_ASTS_RESPONSE_TRANSFER_ERROR:
 468                 case MBOX_ASTS_NVRAM_INVALID:
 469                 case MBOX_ASTS_IP_ADDRESS_CHANGED:
 470                 case MBOX_ASTS_DHCP_LEASE_EXPIRED:
 471                         DEBUG2(printk("scsi%ld: AEN %04x, ERROR Status, "
 472                                       "Reset HA\n", ha->host_no, mbox_status));
 473                         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 474                         break;
 475
 476                 case MBOX_ASTS_LINK_UP:
 477                         DEBUG2(printk("scsi%ld: AEN %04x Adapter LINK UP\n",
 478                                       ha->host_no, mbox_status));
 479                         set_bit(AF_LINK_UP, &ha->flags);
 480                         break;
 481
 482                 case MBOX_ASTS_LINK_DOWN:
 483                         DEBUG2(printk("scsi%ld: AEN %04x Adapter LINK DOWN\n",
 484                                       ha->host_no, mbox_status));
 485                         clear_bit(AF_LINK_UP, &ha->flags);
 486                         break;
 487
 488                 case MBOX_ASTS_HEARTBEAT:
 489                         ha->seconds_since_last_heartbeat = 0;
 490                         break;
 491
 492                 case MBOX_ASTS_DHCP_LEASE_ACQUIRED:
 493                         DEBUG2(printk("scsi%ld: AEN %04x DHCP LEASE "
 494                                       "ACQUIRED\n", ha->host_no, mbox_status));
 495                         set_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags);
 496                         break;
 497
 498                 case MBOX_ASTS_PROTOCOL_STATISTIC_ALARM:
 499                 case MBOX_ASTS_SCSI_COMMAND_PDU_REJECTED: /* Target
 500                                                            * mode
 501                                                            * only */
 502                 case MBOX_ASTS_UNSOLICITED_PDU_RECEIVED:  /* Connection mode */
 503                 case MBOX_ASTS_IPSEC_SYSTEM_FATAL_ERROR:
 504                 case MBOX_ASTS_SUBNET_STATE_CHANGE:
 505                         /* No action */
 506                         DEBUG2(printk("scsi%ld: AEN %04x\n", ha->host_no,
 507                                       mbox_status));
 508                         break;
 509
 510                 case MBOX_ASTS_IP_ADDR_STATE_CHANGED:
 511                         mbox_stat2 = readl(&ha->reg->mailbox[2]);
 512                         mbox_stat3 = readl(&ha->reg->mailbox[3]);
 513
 514                         if ((mbox_stat3 == 5) && (mbox_stat2 == 3))
 515                                 set_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags);
 516                         else if ((mbox_stat3 == 2) && (mbox_stat2 == 5))
 517                                 set_bit(DPC_RESET_HA, &ha->dpc_flags);
 518                         break;
 519
 520                 case MBOX_ASTS_MAC_ADDRESS_CHANGED:
 521                 case MBOX_ASTS_DNS:
 522                         /* No action */
 523                         DEBUG2(printk(KERN_INFO "scsi%ld: AEN %04x, "
 524                                       "mbox_sts[1]=%04x, mbox_sts[2]=%04x\n",
 525                                       ha->host_no, mbox_status,
 526                                       readl(&ha->reg->mailbox[1]),
 527                                       readl(&ha->reg->mailbox[2])));
 528                         break;
 529
 530                 case MBOX_ASTS_SELF_TEST_FAILED:
 531                 case MBOX_ASTS_LOGIN_FAILED:
 532                         /* No action */
 533                         DEBUG2(printk("scsi%ld: AEN %04x, mbox_sts[1]=%04x, "
 534                                       "mbox_sts[2]=%04x, mbox_sts[3]=%04x\n",
 535                                       ha->host_no, mbox_status,
 536                                       readl(&ha->reg->mailbox[1]),
 537                                       readl(&ha->reg->mailbox[2]),
 538                                       readl(&ha->reg->mailbox[3])));
 539                         break;
 540
 541                 case MBOX_ASTS_DATABASE_CHANGED:
 542                         /* Queue AEN information and process it in the DPC
 543                          * routine */
 544                         if (ha->aen_q_count > 0) {
 545
 546                                 /* decrement available counter */
 547                                 ha->aen_q_count--;
 548
 549                                 for (i = 1; i < MBOX_AEN_REG_COUNT; i++)
 550                                         ha->aen_q[ha->aen_in].mbox_sts[i] =
 551                                                 readl(&ha->reg->mailbox[i]);
 552
 553                                 ha->aen_q[ha->aen_in].mbox_sts[0] = mbox_status;
 554
 555                                 /* print debug message */
 556                                 DEBUG2(printk("scsi%ld: AEN[%d] %04x queued"
 557                                               " mb1:0x%x mb2:0x%x mb3:0x%x mb4:0x%x\n",
 558                                               ha->host_no, ha->aen_in,
 559                                               mbox_status,
 560                                               ha->aen_q[ha->aen_in].mbox_sts[1],
 561                                               ha->aen_q[ha->aen_in].mbox_sts[2],
 562                                               ha->aen_q[ha->aen_in].mbox_sts[3],
 563                                               ha->aen_q[ha->aen_in].  mbox_sts[4]));
 564                                 /* advance pointer */
 565                                 ha->aen_in++;
 566                                 if (ha->aen_in == MAX_AEN_ENTRIES)
 567                                         ha->aen_in = 0;
 568
 569                                 /* The DPC routine will process the aen */
 570                                 set_bit(DPC_AEN, &ha->dpc_flags);
 571                         } else {
 572                                 DEBUG2(printk("scsi%ld: %s: aen %04x, queue "
 573                                               "overflowed!  AEN LOST!!\n",
 574                                               ha->host_no, __func__,
 575                                               mbox_status));
 576
 577                                 DEBUG2(printk("scsi%ld: DUMP AEN QUEUE\n",
 578                                               ha->host_no));
 579
 580                                 for (i = 0; i < MAX_AEN_ENTRIES; i++) {
 581                                         DEBUG2(printk("AEN[%d] %04x %04x %04x "
 582                                                       "%04x\n", i,
 583                                                       ha->aen_q[i].mbox_sts[0],
 584                                                       ha->aen_q[i].mbox_sts[1],
 585                                                       ha->aen_q[i].mbox_sts[2],
 586                                                       ha->aen_q[i].mbox_sts[3]));
 587                                 }
 588                         }
 589                         break;
 590
 591                 default:
 592                         DEBUG2(printk(KERN_WARNING
 593                                       "scsi%ld: AEN %04x UNKNOWN\n",
 594                                       ha->host_no, mbox_status));
 595                         break;
 596                 }
 597         } else {
 598                 DEBUG2(printk("scsi%ld: Unknown mailbox status %08X\n",
 599                               ha->host_no, mbox_status));
 600
 601                 ha->mbox_status[0] = mbox_status;
 602         }
 603 }
 604
 605 /**
 606  * qla4xxx_interrupt_service_routine - isr
 607  * @ha: pointer to host adapter structure.
 608  *
 609  * This is the main interrupt service routine.
 610  * hardware_lock locked upon entry. runs in interrupt context.
 611  **/
 612 void qla4xxx_interrupt_service_routine(struct scsi_qla_host * ha,
 613                                        uint32_t intr_status)
 614 {
 615         /* Process response queue interrupt. */
 616         if (intr_status & CSR_SCSI_COMPLETION_INTR)
 617                 qla4xxx_process_response_queue(ha);
 618
 619         /* Process mailbox/asynch event  interrupt.*/
 620         if (intr_status & CSR_SCSI_PROCESSOR_INTR) {
 621                 qla4xxx_isr_decode_mailbox(ha,
 622                                            readl(&ha->reg->mailbox[0]));
 623
 624                 /* Clear Mailbox Interrupt */
 625                 writel(set_rmask(CSR_SCSI_PROCESSOR_INTR),
 626                        &ha->reg->ctrl_status);
 627                 readl(&ha->reg->ctrl_status);
 628         }
 629 }
 630
 631 /**
 632  * qla4xxx_intr_handler - hardware interrupt handler.
 633  * @irq: Unused
 634  * @dev_id: Pointer to host adapter structure
 635  **/
 636 irqreturn_t qla4xxx_intr_handler(int irq, void *dev_id)
 637 {
 638         struct scsi_qla_host *ha;
 639         uint32_t intr_status;
 640         unsigned long flags = 0;
 641         uint8_t reqs_count = 0;
 642
 643         ha = (struct scsi_qla_host *) dev_id;
 644         if (!ha) {
 645                 DEBUG2(printk(KERN_INFO
 646                               "qla4xxx: Interrupt with NULL host ptr\n"));
 647                 return IRQ_NONE;
 648         }
 649
 650         spin_lock_irqsave(&ha->hardware_lock, flags);
 651
 652         ha->isr_count++;
 653         /*
 654          * Repeatedly service interrupts up to a maximum of
 655          * MAX_REQS_SERVICED_PER_INTR
 656          */
 657         while (1) {
 658                 /*
 659                  * Read interrupt status
 660                  */
 661                 if (le32_to_cpu(ha->shadow_regs->rsp_q_in) !=
 662                     ha->response_out)
 663                         intr_status = CSR_SCSI_COMPLETION_INTR;
 664                 else
 665                         intr_status = readl(&ha->reg->ctrl_status);
 666
 667                 if ((intr_status &
 668                      (CSR_SCSI_RESET_INTR|CSR_FATAL_ERROR|INTR_PENDING)) ==
 669                     0) {
 670                         if (reqs_count == 0)
 671                                 ha->spurious_int_count++;
 672                         break;
 673                 }
 674
 675                 if (intr_status & CSR_FATAL_ERROR) {
 676                         DEBUG2(printk(KERN_INFO "scsi%ld: Fatal Error, "
 677                                       "Status 0x%04x\n", ha->host_no,
 678                                       readl(isp_port_error_status (ha))));
 679
 680                         /* Issue Soft Reset to clear this error condition.
 681                          * This will prevent the RISC from repeatedly
 682                          * interrupting the driver; thus, allowing the DPC to
 683                          * get scheduled to continue error recovery.
 684                          * NOTE: Disabling RISC interrupts does not work in
 685                          * this case, as CSR_FATAL_ERROR overrides
 686                          * CSR_SCSI_INTR_ENABLE */
 687                         if ((readl(&ha->reg->ctrl_status) &
 688                              CSR_SCSI_RESET_INTR) == 0) {
 689                                 writel(set_rmask(CSR_SOFT_RESET),
 690                                        &ha->reg->ctrl_status);
 691                                 readl(&ha->reg->ctrl_status);
 692                         }
 693
 694                         writel(set_rmask(CSR_FATAL_ERROR),
 695                                &ha->reg->ctrl_status);
 696                         readl(&ha->reg->ctrl_status);
 697
 698                         __qla4xxx_disable_intrs(ha);
 699
 700                         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 701
 702                         break;
 703                 } else if (intr_status & CSR_SCSI_RESET_INTR) {
 704                         clear_bit(AF_ONLINE, &ha->flags);
 705                         __qla4xxx_disable_intrs(ha);
 706
 707                         writel(set_rmask(CSR_SCSI_RESET_INTR),
 708                                &ha->reg->ctrl_status);
 709                         readl(&ha->reg->ctrl_status);
 710
 711                         if (!ql4_mod_unload)
 712                                 set_bit(DPC_RESET_HA_INTR, &ha->dpc_flags);
 713
 714                         break;
 715                 } else if (intr_status & INTR_PENDING) {
 716                         qla4xxx_interrupt_service_routine(ha, intr_status);
 717                         ha->total_io_count++;
 718                         if (++reqs_count == MAX_REQS_SERVICED_PER_INTR)
 719                                 break;
 720
 721                         intr_status = 0;
 722                 }
 723         }
 724
 725         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 726
 727         return IRQ_HANDLED;
 728 }
 729
 730 /**
 731  * qla4xxx_process_aen - processes AENs generated by firmware
 732  * @ha: pointer to host adapter structure.
 733  * @process_aen: type of AENs to process
 734  *
 735  * Processes specific types of Asynchronous Events generated by firmware.
 736  * The type of AENs to process is specified by process_aen and can be
 737  *      PROCESS_ALL_AENS         0
 738  *      FLUSH_DDB_CHANGED_AENS   1
 739  *      RELOGIN_DDB_CHANGED_AENS 2
 740  **/
 741 void qla4xxx_process_aen(struct scsi_qla_host * ha, uint8_t process_aen)
 742 {
 743         uint32_t mbox_sts[MBOX_AEN_REG_COUNT];
 744         struct aen *aen;
 745         int i;
 746         unsigned long flags;
 747
 748         spin_lock_irqsave(&ha->hardware_lock, flags);
 749         while (ha->aen_out != ha->aen_in) {
 750                 aen = &ha->aen_q[ha->aen_out];
 751                 /* copy aen information to local structure */
 752                 for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
 753                         mbox_sts[i] = aen->mbox_sts[i];
 754
 755                 ha->aen_q_count++;
 756                 ha->aen_out++;
 757
 758                 if (ha->aen_out == MAX_AEN_ENTRIES)
 759                         ha->aen_out = 0;
 760
 761                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 762
 763                 DEBUG2(printk("qla4xxx(%ld): AEN[%d]=0x%08x, mbx1=0x%08x mbx2=0x%08x"
 764                         " mbx3=0x%08x mbx4=0x%08x\n", ha->host_no,
 765                         (ha->aen_out ? (ha->aen_out-1): (MAX_AEN_ENTRIES-1)),
 766                         mbox_sts[0], mbox_sts[1], mbox_sts[2],
 767                         mbox_sts[3], mbox_sts[4]));
 768
 769                 switch (mbox_sts[0]) {
 770                 case MBOX_ASTS_DATABASE_CHANGED:
 771                         if (process_aen == FLUSH_DDB_CHANGED_AENS) {
 772                                 DEBUG2(printk("scsi%ld: AEN[%d] %04x, index "
 773                                               "[%d] state=%04x FLUSHED!\n",
 774                                               ha->host_no, ha->aen_out,
 775                                               mbox_sts[0], mbox_sts[2],
 776                                               mbox_sts[3]));
 777                                 break;
 778                         } else if (process_aen == RELOGIN_DDB_CHANGED_AENS) {
 779                                 /* for use during init time, we only want to
 780                                  * relogin non-active ddbs */
 781                                 struct ddb_entry *ddb_entry;
 782
 783                                 ddb_entry =
 784                                         /* FIXME: name length? */
 785                                         qla4xxx_lookup_ddb_by_fw_index(ha,
 786                                                                        mbox_sts[2]);
 787                                 if (!ddb_entry)
 788                                         break;
 789
 790                                 ddb_entry->dev_scan_wait_to_complete_relogin =
 791                                         0;
 792                                 ddb_entry->dev_scan_wait_to_start_relogin =
 793                                         jiffies +
 794                                         ((ddb_entry->default_time2wait +
 795                                           4) * HZ);
 796
 797                                 DEBUG2(printk("scsi%ld: ddb index [%d] initate"
 798                                               " RELOGIN after %d seconds\n",
 799                                               ha->host_no,
 800                                               ddb_entry->fw_ddb_index,
 801                                               ddb_entry->default_time2wait +
 802                                               4));
 803                                 break;
 804                         }
 805
 806                         if (mbox_sts[1] == 0) { /* Global DB change. */
 807                                 qla4xxx_reinitialize_ddb_list(ha);
 808                         } else if (mbox_sts[1] == 1) {  /* Specific device. */
 809                                 qla4xxx_process_ddb_changed(ha, mbox_sts[2],
 810                                                             mbox_sts[3]);
 811                         }
 812                         break;
 813                 }
 814                 spin_lock_irqsave(&ha->hardware_lock, flags);
 815         }
 816         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 817 }
 818