drivers/scsi/qla4xxx/ql4_isr.c

   1 /*
   2  * QLogic iSCSI HBA Driver
   3  * Copyright (c)  2003-2006 QLogic Corporation
   4  *
   5  * See LICENSE.qla4xxx for copyright and licensing details.
   6  */
   7
   8 #include "ql4_def.h"
   9 #include "ql4_glbl.h"
  10 #include "ql4_dbg.h"
  11 #include "ql4_inline.h"
  12
  13 /**
  14  * qla4xxx_status_entry - processes status IOCBs
  15  * @ha: Pointer to host adapter structure.
  16  * @sts_entry: Pointer to status entry structure.
  17  **/
  18 static void qla4xxx_status_entry(struct scsi_qla_host *ha,
  19                                  struct status_entry *sts_entry)
  20 {
  21         uint8_t scsi_status;
  22         struct scsi_cmnd *cmd;
  23         struct srb *srb;
  24         struct ddb_entry *ddb_entry;
  25         uint32_t residual;
  26         uint16_t sensebytecnt;
  27
  28         srb = qla4xxx_del_from_active_array(ha, le32_to_cpu(sts_entry->handle));
  29         if (!srb) {
  30                 /* FIXMEdg: Don't we need to reset ISP in this case??? */
  31                 DEBUG2(printk(KERN_WARNING "scsi%ld: %s: Status Entry invalid "
  32                               "handle 0x%x, sp=%p. This cmd may have already "
  33                               "been completed.\n", ha->host_no, __func__,
  34                               le32_to_cpu(sts_entry->handle), srb));
  35                 dev_warn(&ha->pdev->dev, "%s invalid status entry:"
  36                         " handle=0x%0x\n", __func__, sts_entry->handle);
  37                 set_bit(DPC_RESET_HA, &ha->dpc_flags);
  38                 return;
  39         }
  40
  41         cmd = srb->cmd;
  42         if (cmd == NULL) {
  43                 DEBUG2(printk("scsi%ld: %s: Command already returned back to "
  44                               "OS pkt->handle=%d srb=%p srb->state:%d\n",
  45                               ha->host_no, __func__, sts_entry->handle,
  46                               srb, srb->state));
  47                 dev_warn(&ha->pdev->dev, "Command is NULL:"
  48                         " already returned to OS (srb=%p)\n", srb);
  49                 return;
  50         }
  51
  52         ddb_entry = srb->ddb;
  53         if (ddb_entry == NULL) {
  54                 cmd->result = DID_NO_CONNECT << 16;
  55                 goto status_entry_exit;
  56         }
  57
  58         residual = le32_to_cpu(sts_entry->residualByteCnt);
  59
  60         /* Translate ISP error to a Linux SCSI error. */
  61         scsi_status = sts_entry->scsiStatus;
  62         switch (sts_entry->completionStatus) {
  63         case SCS_COMPLETE:
  64
  65                 if (sts_entry->iscsiFlags & ISCSI_FLAG_RESIDUAL_OVER) {
  66                         cmd->result = DID_ERROR << 16;
  67                         break;
  68                 }
  69
  70                 if (sts_entry->iscsiFlags &ISCSI_FLAG_RESIDUAL_UNDER) {
  71                         scsi_set_resid(cmd, residual);
  72                         if (!scsi_status && ((scsi_bufflen(cmd) - residual) <
  73                                 cmd->underflow)) {
  74
  75                                 cmd->result = DID_ERROR << 16;
  76
  77                                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: "
  78                                         "Mid-layer Data underrun0, "
  79                                         "xferlen = 0x%x, "
  80                                         "residual = 0x%x\n", ha->host_no,
  81                                         cmd->device->channel,
  82                                         cmd->device->id,
  83                                         cmd->device->lun, __func__,
  84                                         scsi_bufflen(cmd), residual));
  85                                 break;
  86                         }
  87                 }
  88
  89                 cmd->result = DID_OK << 16 | scsi_status;
  90
  91                 if (scsi_status != SCSI_CHECK_CONDITION)
  92                         break;
  93
  94                 /* Copy Sense Data into sense buffer. */
  95                 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
  96
  97                 sensebytecnt = le16_to_cpu(sts_entry->senseDataByteCnt);
  98                 if (sensebytecnt == 0)
  99                         break;
 100
 101                 memcpy(cmd->sense_buffer, sts_entry->senseData,
 102                        min_t(uint16_t, sensebytecnt, SCSI_SENSE_BUFFERSIZE));
 103
 104                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: sense key = %x, "
 105                               "ASC/ASCQ = %02x/%02x\n", ha->host_no,
 106                               cmd->device->channel, cmd->device->id,
 107                               cmd->device->lun, __func__,
 108                               sts_entry->senseData[2] & 0x0f,
 109                               sts_entry->senseData[12],
 110                               sts_entry->senseData[13]));
 111
 112                 srb->flags |= SRB_GOT_SENSE;
 113                 break;
 114
 115         case SCS_INCOMPLETE:
 116                 /* Always set the status to DID_ERROR, since
 117                  * all conditions result in that status anyway */
 118                 cmd->result = DID_ERROR << 16;
 119                 break;
 120
 121         case SCS_RESET_OCCURRED:
 122                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: Device RESET occurred\n",
 123                               ha->host_no, cmd->device->channel,
 124                               cmd->device->id, cmd->device->lun, __func__));
 125
 126                 cmd->result = DID_RESET << 16;
 127                 break;
 128
 129         case SCS_ABORTED:
 130                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: Abort occurred\n",
 131                               ha->host_no, cmd->device->channel,
 132                               cmd->device->id, cmd->device->lun, __func__));
 133
 134                 cmd->result = DID_RESET << 16;
 135                 break;
 136
 137         case SCS_TIMEOUT:
 138                 DEBUG2(printk(KERN_INFO "scsi%ld:%d:%d:%d: Timeout\n",
 139                               ha->host_no, cmd->device->channel,
 140                               cmd->device->id, cmd->device->lun));
 141
 142                 cmd->result = DID_TRANSPORT_DISRUPTED << 16;
 143
 144                 /*
 145                  * Mark device missing so that we won't continue to send
 146                  * I/O to this device.  We should get a ddb state change
 147                  * AEN soon.
 148                  */
 149                 if (atomic_read(&ddb_entry->state) == DDB_STATE_ONLINE)
 150                         qla4xxx_mark_device_missing(ha, ddb_entry);
 151                 break;
 152
 153         case SCS_DATA_UNDERRUN:
 154         case SCS_DATA_OVERRUN:
 155                 if ((sts_entry->iscsiFlags & ISCSI_FLAG_RESIDUAL_OVER) ||
 156                         (sts_entry->completionStatus == SCS_DATA_OVERRUN)) {
 157                         DEBUG2(printk("scsi%ld:%d:%d:%d: %s: " "Data overrun, "
 158                                       "residual = 0x%x\n", ha->host_no,
 159                                       cmd->device->channel, cmd->device->id,
 160                                       cmd->device->lun, __func__, residual));
 161
 162                         cmd->result = DID_ERROR << 16;
 163                         break;
 164                 }
 165
 166                 scsi_set_resid(cmd, residual);
 167
 168                 /*
 169                  * If there is scsi_status, it takes precedense over
 170                  * underflow condition.
 171                  */
 172                 if (scsi_status != 0) {
 173                         cmd->result = DID_OK << 16 | scsi_status;
 174
 175                         if (scsi_status != SCSI_CHECK_CONDITION)
 176                                 break;
 177
 178                         /* Copy Sense Data into sense buffer. */
 179                         memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
 180
 181                         sensebytecnt =
 182                                 le16_to_cpu(sts_entry->senseDataByteCnt);
 183                         if (sensebytecnt == 0)
 184                                 break;
 185
 186                         memcpy(cmd->sense_buffer, sts_entry->senseData,
 187                                min_t(uint16_t, sensebytecnt, SCSI_SENSE_BUFFERSIZE));
 188
 189                         DEBUG2(printk("scsi%ld:%d:%d:%d: %s: sense key = %x, "
 190                                       "ASC/ASCQ = %02x/%02x\n", ha->host_no,
 191                                       cmd->device->channel, cmd->device->id,
 192                                       cmd->device->lun, __func__,
 193                                       sts_entry->senseData[2] & 0x0f,
 194                                       sts_entry->senseData[12],
 195                                       sts_entry->senseData[13]));
 196                 } else {
 197                         /*
 198                          * If RISC reports underrun and target does not
 199                          * report it then we must have a lost frame, so
 200                          * tell upper layer to retry it by reporting a
 201                          * bus busy.
 202                          */
 203                         if ((sts_entry->iscsiFlags &
 204                              ISCSI_FLAG_RESIDUAL_UNDER) == 0) {
 205                                 cmd->result = DID_BUS_BUSY << 16;
 206                         } else if ((scsi_bufflen(cmd) - residual) <
 207                                    cmd->underflow) {
 208                                 /*
 209                                  * Handle mid-layer underflow???
 210                                  *
 211                                  * For kernels less than 2.4, the driver must
 212                                  * return an error if an underflow is detected.
 213                                  * For kernels equal-to and above 2.4, the
 214                                  * mid-layer will appearantly handle the
 215                                  * underflow by detecting the residual count --
 216                                  * unfortunately, we do not see where this is
 217                                  * actually being done.  In the interim, we
 218                                  * will return DID_ERROR.
 219                                  */
 220                                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: "
 221                                         "Mid-layer Data underrun1, "
 222                                         "xferlen = 0x%x, "
 223                                         "residual = 0x%x\n", ha->host_no,
 224                                         cmd->device->channel,
 225                                         cmd->device->id,
 226                                         cmd->device->lun, __func__,
 227                                         scsi_bufflen(cmd), residual));
 228
 229                                 cmd->result = DID_ERROR << 16;
 230                         } else {
 231                                 cmd->result = DID_OK << 16;
 232                         }
 233                 }
 234                 break;
 235
 236         case SCS_DEVICE_LOGGED_OUT:
 237         case SCS_DEVICE_UNAVAILABLE:
 238                 /*
 239                  * Mark device missing so that we won't continue to
 240                  * send I/O to this device.  We should get a ddb
 241                  * state change AEN soon.
 242                  */
 243                 if (atomic_read(&ddb_entry->state) == DDB_STATE_ONLINE)
 244                         qla4xxx_mark_device_missing(ha, ddb_entry);
 245
 246                 cmd->result = DID_TRANSPORT_DISRUPTED << 16;
 247                 break;
 248
 249         case SCS_QUEUE_FULL:
 250                 /*
 251                  * SCSI Mid-Layer handles device queue full
 252                  */
 253                 cmd->result = DID_OK << 16 | sts_entry->scsiStatus;
 254                 DEBUG2(printk("scsi%ld:%d:%d: %s: QUEUE FULL detected "
 255                               "compl=%02x, scsi=%02x, state=%02x, iFlags=%02x,"
 256                               " iResp=%02x\n", ha->host_no, cmd->device->id,
 257                               cmd->device->lun, __func__,
 258                               sts_entry->completionStatus,
 259                               sts_entry->scsiStatus, sts_entry->state_flags,
 260                               sts_entry->iscsiFlags,
 261                               sts_entry->iscsiResponse));
 262                 break;
 263
 264         default:
 265                 cmd->result = DID_ERROR << 16;
 266                 break;
 267         }
 268
 269 status_entry_exit:
 270
 271         /* complete the request */
 272         srb->cc_stat = sts_entry->completionStatus;
 273         qla4xxx_srb_compl(ha, srb);
 274 }
 275
 276 /**
 277  * qla4xxx_process_response_queue - process response queue completions
 278  * @ha: Pointer to host adapter structure.
 279  *
 280  * This routine process response queue completions in interrupt context.
 281  * Hardware_lock locked upon entry
 282  **/
 283 static void qla4xxx_process_response_queue(struct scsi_qla_host * ha)
 284 {
 285         uint32_t count = 0;
 286         struct srb *srb = NULL;
 287         struct status_entry *sts_entry;
 288
 289         /* Process all responses from response queue */
 290         while ((ha->response_in =
 291                 (uint16_t)le32_to_cpu(ha->shadow_regs->rsp_q_in)) !=
 292                ha->response_out) {
 293                 sts_entry = (struct status_entry *) ha->response_ptr;
 294                 count++;
 295
 296                 /* Advance pointers for next entry */
 297                 if (ha->response_out == (RESPONSE_QUEUE_DEPTH - 1)) {
 298                         ha->response_out = 0;
 299                         ha->response_ptr = ha->response_ring;
 300                 } else {
 301                         ha->response_out++;
 302                         ha->response_ptr++;
 303                 }
 304
 305                 /* process entry */
 306                 switch (sts_entry->hdr.entryType) {
 307                 case ET_STATUS:
 308                         /*
 309                          * Common status - Single completion posted in single
 310                          * IOSB.
 311                          */
 312                         qla4xxx_status_entry(ha, sts_entry);
 313                         break;
 314
 315                 case ET_PASSTHRU_STATUS:
 316                         break;
 317
 318                 case ET_STATUS_CONTINUATION:
 319                         /* Just throw away the status continuation entries */
 320                         DEBUG2(printk("scsi%ld: %s: Status Continuation entry "
 321                                       "- ignoring\n", ha->host_no, __func__));
 322                         break;
 323
 324                 case ET_COMMAND:
 325                         /* ISP device queue is full. Command not
 326                          * accepted by ISP.  Queue command for
 327                          * later */
 328
 329                         srb = qla4xxx_del_from_active_array(ha,
 330                                                     le32_to_cpu(sts_entry->
 331                                                                 handle));
 332                         if (srb == NULL)
 333                                 goto exit_prq_invalid_handle;
 334
 335                         DEBUG2(printk("scsi%ld: %s: FW device queue full, "
 336                                       "srb %p\n", ha->host_no, __func__, srb));
 337
 338                         /* ETRY normally by sending it back with
 339                          * DID_BUS_BUSY */
 340                         srb->cmd->result = DID_BUS_BUSY << 16;
 341                         qla4xxx_srb_compl(ha, srb);
 342                         break;
 343
 344                 case ET_CONTINUE:
 345                         /* Just throw away the continuation entries */
 346                         DEBUG2(printk("scsi%ld: %s: Continuation entry - "
 347                                       "ignoring\n", ha->host_no, __func__));
 348                         break;
 349
 350                 default:
 351                         /*
 352                          * Invalid entry in response queue, reset RISC
 353                          * firmware.
 354                          */
 355                         DEBUG2(printk("scsi%ld: %s: Invalid entry %x in "
 356                                       "response queue \n", ha->host_no,
 357                                       __func__,
 358                                       sts_entry->hdr.entryType));
 359                         goto exit_prq_error;
 360                 }
 361         }
 362
 363         /*
 364          * Done with responses, update the ISP For QLA4010, this also clears
 365          * the interrupt.
 366          */
 367         writel(ha->response_out, &ha->reg->rsp_q_out);
 368         readl(&ha->reg->rsp_q_out);
 369
 370         return;
 371
 372 exit_prq_invalid_handle:
 373         DEBUG2(printk("scsi%ld: %s: Invalid handle(srb)=%p type=%x IOCS=%x\n",
 374                       ha->host_no, __func__, srb, sts_entry->hdr.entryType,
 375                       sts_entry->completionStatus));
 376
 377 exit_prq_error:
 378         writel(ha->response_out, &ha->reg->rsp_q_out);
 379         readl(&ha->reg->rsp_q_out);
 380
 381         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 382 }
 383
 384 /**
 385  * qla4xxx_isr_decode_mailbox - decodes mailbox status
 386  * @ha: Pointer to host adapter structure.
 387  * @mailbox_status: Mailbox status.
 388  *
 389  * This routine decodes the mailbox status during the ISR.
 390  * Hardware_lock locked upon entry. runs in interrupt context.
 391  **/
 392 static void qla4xxx_isr_decode_mailbox(struct scsi_qla_host * ha,
 393                                        uint32_t mbox_status)
 394 {
 395         int i;
 396         uint32_t mbox_stat2, mbox_stat3;
 397
 398         if ((mbox_status == MBOX_STS_BUSY) ||
 399             (mbox_status == MBOX_STS_INTERMEDIATE_COMPLETION) ||
 400             (mbox_status >> 12 == MBOX_COMPLETION_STATUS)) {
 401                 ha->mbox_status[0] = mbox_status;
 402
 403                 if (test_bit(AF_MBOX_COMMAND, &ha->flags)) {
 404                         /*
 405                          * Copy all mailbox registers to a temporary
 406                          * location and set mailbox command done flag
 407                          */
 408                         for (i = 1; i < ha->mbox_status_count; i++)
 409                                 ha->mbox_status[i] =
 410                                         readl(&ha->reg->mailbox[i]);
 411
 412                         set_bit(AF_MBOX_COMMAND_DONE, &ha->flags);
 413                 }
 414         } else if (mbox_status >> 12 == MBOX_ASYNC_EVENT_STATUS) {
 415                 /* Immediately process the AENs that don't require much work.
 416                  * Only queue the database_changed AENs */
 417                 if (ha->aen_log.count < MAX_AEN_ENTRIES) {
 418                         for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
 419                                 ha->aen_log.entry[ha->aen_log.count].mbox_sts[i] =
 420                                         readl(&ha->reg->mailbox[i]);
 421                         ha->aen_log.count++;
 422                 }
 423                 switch (mbox_status) {
 424                 case MBOX_ASTS_SYSTEM_ERROR:
 425                         /* Log Mailbox registers */
 426                         if (ql4xdontresethba) {
 427                                 DEBUG2(printk("%s:Dont Reset HBA\n",
 428                                               __func__));
 429                         } else {
 430                                 set_bit(AF_GET_CRASH_RECORD, &ha->flags);
 431                                 set_bit(DPC_RESET_HA, &ha->dpc_flags);
 432                         }
 433                         break;
 434
 435                 case MBOX_ASTS_REQUEST_TRANSFER_ERROR:
 436                 case MBOX_ASTS_RESPONSE_TRANSFER_ERROR:
 437                 case MBOX_ASTS_NVRAM_INVALID:
 438                 case MBOX_ASTS_IP_ADDRESS_CHANGED:
 439                 case MBOX_ASTS_DHCP_LEASE_EXPIRED:
 440                         DEBUG2(printk("scsi%ld: AEN %04x, ERROR Status, "
 441                                       "Reset HA\n", ha->host_no, mbox_status));
 442                         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 443                         break;
 444
 445                 case MBOX_ASTS_LINK_UP:
 446                         DEBUG2(printk("scsi%ld: AEN %04x Adapter LINK UP\n",
 447                                       ha->host_no, mbox_status));
 448                         set_bit(AF_LINK_UP, &ha->flags);
 449                         break;
 450
 451                 case MBOX_ASTS_LINK_DOWN:
 452                         DEBUG2(printk("scsi%ld: AEN %04x Adapter LINK DOWN\n",
 453                                       ha->host_no, mbox_status));
 454                         clear_bit(AF_LINK_UP, &ha->flags);
 455                         break;
 456
 457                 case MBOX_ASTS_HEARTBEAT:
 458                         ha->seconds_since_last_heartbeat = 0;
 459                         break;
 460
 461                 case MBOX_ASTS_DHCP_LEASE_ACQUIRED:
 462                         DEBUG2(printk("scsi%ld: AEN %04x DHCP LEASE "
 463                                       "ACQUIRED\n", ha->host_no, mbox_status));
 464                         set_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags);
 465                         break;
 466
 467                 case MBOX_ASTS_PROTOCOL_STATISTIC_ALARM:
 468                 case MBOX_ASTS_SCSI_COMMAND_PDU_REJECTED: /* Target
 469                                                            * mode
 470                                                            * only */
 471                 case MBOX_ASTS_UNSOLICITED_PDU_RECEIVED:  /* Connection mode */
 472                 case MBOX_ASTS_IPSEC_SYSTEM_FATAL_ERROR:
 473                 case MBOX_ASTS_SUBNET_STATE_CHANGE:
 474                         /* No action */
 475                         DEBUG2(printk("scsi%ld: AEN %04x\n", ha->host_no,
 476                                       mbox_status));
 477                         break;
 478
 479                 case MBOX_ASTS_IP_ADDR_STATE_CHANGED:
 480                         mbox_stat2 = readl(&ha->reg->mailbox[2]);
 481                         mbox_stat3 = readl(&ha->reg->mailbox[3]);
 482
 483                         if ((mbox_stat3 == 5) && (mbox_stat2 == 3))
 484                                 set_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags);
 485                         else if ((mbox_stat3 == 2) && (mbox_stat2 == 5))
 486                                 set_bit(DPC_RESET_HA, &ha->dpc_flags);
 487                         break;
 488
 489                 case MBOX_ASTS_MAC_ADDRESS_CHANGED:
 490                 case MBOX_ASTS_DNS:
 491                         /* No action */
 492                         DEBUG2(printk(KERN_INFO "scsi%ld: AEN %04x, "
 493                                       "mbox_sts[1]=%04x, mbox_sts[2]=%04x\n",
 494                                       ha->host_no, mbox_status,
 495                                       readl(&ha->reg->mailbox[1]),
 496                                       readl(&ha->reg->mailbox[2])));
 497                         break;
 498
 499                 case MBOX_ASTS_SELF_TEST_FAILED:
 500                 case MBOX_ASTS_LOGIN_FAILED:
 501                         /* No action */
 502                         DEBUG2(printk("scsi%ld: AEN %04x, mbox_sts[1]=%04x, "
 503                                       "mbox_sts[2]=%04x, mbox_sts[3]=%04x\n",
 504                                       ha->host_no, mbox_status,
 505                                       readl(&ha->reg->mailbox[1]),
 506                                       readl(&ha->reg->mailbox[2]),
 507                                       readl(&ha->reg->mailbox[3])));
 508                         break;
 509
 510                 case MBOX_ASTS_DATABASE_CHANGED:
 511                         /* Queue AEN information and process it in the DPC
 512                          * routine */
 513                         if (ha->aen_q_count > 0) {
 514
 515                                 /* decrement available counter */
 516                                 ha->aen_q_count--;
 517
 518                                 for (i = 1; i < MBOX_AEN_REG_COUNT; i++)
 519                                         ha->aen_q[ha->aen_in].mbox_sts[i] =
 520                                                 readl(&ha->reg->mailbox[i]);
 521
 522                                 ha->aen_q[ha->aen_in].mbox_sts[0] = mbox_status;
 523
 524                                 /* print debug message */
 525                                 DEBUG2(printk("scsi%ld: AEN[%d] %04x queued"
 526                                               " mb1:0x%x mb2:0x%x mb3:0x%x mb4:0x%x\n",
 527                                               ha->host_no, ha->aen_in,
 528                                               mbox_status,
 529                                               ha->aen_q[ha->aen_in].mbox_sts[1],
 530                                               ha->aen_q[ha->aen_in].mbox_sts[2],
 531                                               ha->aen_q[ha->aen_in].mbox_sts[3],
 532                                               ha->aen_q[ha->aen_in].  mbox_sts[4]));
 533                                 /* advance pointer */
 534                                 ha->aen_in++;
 535                                 if (ha->aen_in == MAX_AEN_ENTRIES)
 536                                         ha->aen_in = 0;
 537
 538                                 /* The DPC routine will process the aen */
 539                                 set_bit(DPC_AEN, &ha->dpc_flags);
 540                         } else {
 541                                 DEBUG2(printk("scsi%ld: %s: aen %04x, queue "
 542                                               "overflowed!  AEN LOST!!\n",
 543                                               ha->host_no, __func__,
 544                                               mbox_status));
 545
 546                                 DEBUG2(printk("scsi%ld: DUMP AEN QUEUE\n",
 547                                               ha->host_no));
 548
 549                                 for (i = 0; i < MAX_AEN_ENTRIES; i++) {
 550                                         DEBUG2(printk("AEN[%d] %04x %04x %04x "
 551                                                       "%04x\n", i,
 552                                                       ha->aen_q[i].mbox_sts[0],
 553                                                       ha->aen_q[i].mbox_sts[1],
 554                                                       ha->aen_q[i].mbox_sts[2],
 555                                                       ha->aen_q[i].mbox_sts[3]));
 556                                 }
 557                         }
 558                         break;
 559
 560                 default:
 561                         DEBUG2(printk(KERN_WARNING
 562                                       "scsi%ld: AEN %04x UNKNOWN\n",
 563                                       ha->host_no, mbox_status));
 564                         break;
 565                 }
 566         } else {
 567                 DEBUG2(printk("scsi%ld: Unknown mailbox status %08X\n",
 568                               ha->host_no, mbox_status));
 569
 570                 ha->mbox_status[0] = mbox_status;
 571         }
 572 }
 573
 574 /**
 575  * qla4xxx_interrupt_service_routine - isr
 576  * @ha: pointer to host adapter structure.
 577  *
 578  * This is the main interrupt service routine.
 579  * hardware_lock locked upon entry. runs in interrupt context.
 580  **/
 581 void qla4xxx_interrupt_service_routine(struct scsi_qla_host * ha,
 582                                        uint32_t intr_status)
 583 {
 584         /* Process response queue interrupt. */
 585         if (intr_status & CSR_SCSI_COMPLETION_INTR)
 586                 qla4xxx_process_response_queue(ha);
 587
 588         /* Process mailbox/asynch event  interrupt.*/
 589         if (intr_status & CSR_SCSI_PROCESSOR_INTR) {
 590                 qla4xxx_isr_decode_mailbox(ha,
 591                                            readl(&ha->reg->mailbox[0]));
 592
 593                 /* Clear Mailbox Interrupt */
 594                 writel(set_rmask(CSR_SCSI_PROCESSOR_INTR),
 595                        &ha->reg->ctrl_status);
 596                 readl(&ha->reg->ctrl_status);
 597         }
 598 }
 599
 600 /**
 601  * qla4xxx_intr_handler - hardware interrupt handler.
 602  * @irq: Unused
 603  * @dev_id: Pointer to host adapter structure
 604  **/
 605 irqreturn_t qla4xxx_intr_handler(int irq, void *dev_id)
 606 {
 607         struct scsi_qla_host *ha;
 608         uint32_t intr_status;
 609         unsigned long flags = 0;
 610         uint8_t reqs_count = 0;
 611
 612         ha = (struct scsi_qla_host *) dev_id;
 613         if (!ha) {
 614                 DEBUG2(printk(KERN_INFO
 615                               "qla4xxx: Interrupt with NULL host ptr\n"));
 616                 return IRQ_NONE;
 617         }
 618
 619         spin_lock_irqsave(&ha->hardware_lock, flags);
 620
 621         ha->isr_count++;
 622         /*
 623          * Repeatedly service interrupts up to a maximum of
 624          * MAX_REQS_SERVICED_PER_INTR
 625          */
 626         while (1) {
 627                 /*
 628                  * Read interrupt status
 629                  */
 630                 if (le32_to_cpu(ha->shadow_regs->rsp_q_in) !=
 631                     ha->response_out)
 632                         intr_status = CSR_SCSI_COMPLETION_INTR;
 633                 else
 634                         intr_status = readl(&ha->reg->ctrl_status);
 635
 636                 if ((intr_status &
 637                      (CSR_SCSI_RESET_INTR|CSR_FATAL_ERROR|INTR_PENDING)) ==
 638                     0) {
 639                         if (reqs_count == 0)
 640                                 ha->spurious_int_count++;
 641                         break;
 642                 }
 643
 644                 if (intr_status & CSR_FATAL_ERROR) {
 645                         DEBUG2(printk(KERN_INFO "scsi%ld: Fatal Error, "
 646                                       "Status 0x%04x\n", ha->host_no,
 647                                       readl(isp_port_error_status (ha))));
 648
 649                         /* Issue Soft Reset to clear this error condition.
 650                          * This will prevent the RISC from repeatedly
 651                          * interrupting the driver; thus, allowing the DPC to
 652                          * get scheduled to continue error recovery.
 653                          * NOTE: Disabling RISC interrupts does not work in
 654                          * this case, as CSR_FATAL_ERROR overrides
 655                          * CSR_SCSI_INTR_ENABLE */
 656                         if ((readl(&ha->reg->ctrl_status) &
 657                              CSR_SCSI_RESET_INTR) == 0) {
 658                                 writel(set_rmask(CSR_SOFT_RESET),
 659                                        &ha->reg->ctrl_status);
 660                                 readl(&ha->reg->ctrl_status);
 661                         }
 662
 663                         writel(set_rmask(CSR_FATAL_ERROR),
 664                                &ha->reg->ctrl_status);
 665                         readl(&ha->reg->ctrl_status);
 666
 667                         __qla4xxx_disable_intrs(ha);
 668
 669                         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 670
 671                         break;
 672                 } else if (intr_status & CSR_SCSI_RESET_INTR) {
 673                         clear_bit(AF_ONLINE, &ha->flags);
 674                         __qla4xxx_disable_intrs(ha);
 675
 676                         writel(set_rmask(CSR_SCSI_RESET_INTR),
 677                                &ha->reg->ctrl_status);
 678                         readl(&ha->reg->ctrl_status);
 679
 680                         if (!ql4_mod_unload)
 681                                 set_bit(DPC_RESET_HA_INTR, &ha->dpc_flags);
 682
 683                         break;
 684                 } else if (intr_status & INTR_PENDING) {
 685                         qla4xxx_interrupt_service_routine(ha, intr_status);
 686                         ha->total_io_count++;
 687                         if (++reqs_count == MAX_REQS_SERVICED_PER_INTR)
 688                                 break;
 689
 690                         intr_status = 0;
 691                 }
 692         }
 693
 694         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 695
 696         return IRQ_HANDLED;
 697 }
 698
 699 /**
 700  * qla4xxx_process_aen - processes AENs generated by firmware
 701  * @ha: pointer to host adapter structure.
 702  * @process_aen: type of AENs to process
 703  *
 704  * Processes specific types of Asynchronous Events generated by firmware.
 705  * The type of AENs to process is specified by process_aen and can be
 706  *      PROCESS_ALL_AENS         0
 707  *      FLUSH_DDB_CHANGED_AENS   1
 708  *      RELOGIN_DDB_CHANGED_AENS 2
 709  **/
 710 void qla4xxx_process_aen(struct scsi_qla_host * ha, uint8_t process_aen)
 711 {
 712         uint32_t mbox_sts[MBOX_AEN_REG_COUNT];
 713         struct aen *aen;
 714         int i;
 715         unsigned long flags;
 716
 717         spin_lock_irqsave(&ha->hardware_lock, flags);
 718         while (ha->aen_out != ha->aen_in) {
 719                 aen = &ha->aen_q[ha->aen_out];
 720                 /* copy aen information to local structure */
 721                 for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
 722                         mbox_sts[i] = aen->mbox_sts[i];
 723
 724                 ha->aen_q_count++;
 725                 ha->aen_out++;
 726
 727                 if (ha->aen_out == MAX_AEN_ENTRIES)
 728                         ha->aen_out = 0;
 729
 730                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 731
 732                 DEBUG2(printk("qla4xxx(%ld): AEN[%d]=0x%08x, mbx1=0x%08x mbx2=0x%08x"
 733                         " mbx3=0x%08x mbx4=0x%08x\n", ha->host_no,
 734                         (ha->aen_out ? (ha->aen_out-1): (MAX_AEN_ENTRIES-1)),
 735                         mbox_sts[0], mbox_sts[1], mbox_sts[2],
 736                         mbox_sts[3], mbox_sts[4]));
 737
 738                 switch (mbox_sts[0]) {
 739                 case MBOX_ASTS_DATABASE_CHANGED:
 740                         if (process_aen == FLUSH_DDB_CHANGED_AENS) {
 741                                 DEBUG2(printk("scsi%ld: AEN[%d] %04x, index "
 742                                               "[%d] state=%04x FLUSHED!\n",
 743                                               ha->host_no, ha->aen_out,
 744                                               mbox_sts[0], mbox_sts[2],
 745                                               mbox_sts[3]));
 746                                 break;
 747                         } else if (process_aen == RELOGIN_DDB_CHANGED_AENS) {
 748                                 /* for use during init time, we only want to
 749                                  * relogin non-active ddbs */
 750                                 struct ddb_entry *ddb_entry;
 751
 752                                 ddb_entry =
 753                                         /* FIXME: name length? */
 754                                         qla4xxx_lookup_ddb_by_fw_index(ha,
 755                                                                        mbox_sts[2]);
 756                                 if (!ddb_entry)
 757                                         break;
 758
 759                                 ddb_entry->dev_scan_wait_to_complete_relogin =
 760                                         0;
 761                                 ddb_entry->dev_scan_wait_to_start_relogin =
 762                                         jiffies +
 763                                         ((ddb_entry->default_time2wait +
 764                                           4) * HZ);
 765
 766                                 DEBUG2(printk("scsi%ld: ddb index [%d] initate"
 767                                               " RELOGIN after %d seconds\n",
 768                                               ha->host_no,
 769                                               ddb_entry->fw_ddb_index,
 770                                               ddb_entry->default_time2wait +
 771                                               4));
 772                                 break;
 773                         }
 774
 775                         if (mbox_sts[1] == 0) { /* Global DB change. */
 776                                 qla4xxx_reinitialize_ddb_list(ha);
 777                         } else if (mbox_sts[1] == 1) {  /* Specific device. */
 778                                 qla4xxx_process_ddb_changed(ha, mbox_sts[2],
 779                                                             mbox_sts[3]);
 780                         }
 781                         break;
 782                 }
 783                 spin_lock_irqsave(&ha->hardware_lock, flags);
 784         }
 785         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 786 }
 787