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, sizeof(cmd->sense_buffer));
 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(sensebytecnt,
 134                            (uint16_t) sizeof(cmd->sense_buffer)));
 135
 136                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: sense key = %x, "
 137                               "ASC/ASCQ = %02x/%02x\n", ha->host_no,
 138                               cmd->device->channel, cmd->device->id,
 139                               cmd->device->lun, __func__,
 140                               sts_entry->senseData[2] & 0x0f,
 141                               sts_entry->senseData[12],
 142                               sts_entry->senseData[13]));
 143
 144                 srb->flags |= SRB_GOT_SENSE;
 145                 break;
 146
 147         case SCS_INCOMPLETE:
 148                 /* Always set the status to DID_ERROR, since
 149                  * all conditions result in that status anyway */
 150                 cmd->result = DID_ERROR << 16;
 151                 break;
 152
 153         case SCS_RESET_OCCURRED:
 154                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: Device RESET occurred\n",
 155                               ha->host_no, cmd->device->channel,
 156                               cmd->device->id, cmd->device->lun, __func__));
 157
 158                 cmd->result = DID_RESET << 16;
 159                 break;
 160
 161         case SCS_ABORTED:
 162                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: Abort occurred\n",
 163                               ha->host_no, cmd->device->channel,
 164                               cmd->device->id, cmd->device->lun, __func__));
 165
 166                 cmd->result = DID_RESET << 16;
 167                 break;
 168
 169         case SCS_TIMEOUT:
 170                 DEBUG2(printk(KERN_INFO "scsi%ld:%d:%d:%d: Timeout\n",
 171                               ha->host_no, cmd->device->channel,
 172                               cmd->device->id, cmd->device->lun));
 173
 174                 cmd->result = DID_BUS_BUSY << 16;
 175
 176                 /*
 177                  * Mark device missing so that we won't continue to send
 178                  * I/O to this device.  We should get a ddb state change
 179                  * AEN soon.
 180                  */
 181                 if (atomic_read(&ddb_entry->state) == DDB_STATE_ONLINE)
 182                         qla4xxx_mark_device_missing(ha, ddb_entry);
 183                 break;
 184
 185         case SCS_DATA_UNDERRUN:
 186         case SCS_DATA_OVERRUN:
 187                 if ((sts_entry->iscsiFlags & ISCSI_FLAG_RESIDUAL_OVER) ||
 188                         (sts_entry->completionStatus == SCS_DATA_OVERRUN)) {
 189                         DEBUG2(printk("scsi%ld:%d:%d:%d: %s: " "Data overrun, "
 190                                       "residual = 0x%x\n", ha->host_no,
 191                                       cmd->device->channel, cmd->device->id,
 192                                       cmd->device->lun, __func__, residual));
 193
 194                         cmd->result = DID_ERROR << 16;
 195                         break;
 196                 }
 197
 198                 scsi_set_resid(cmd, residual);
 199
 200                 /*
 201                  * If there is scsi_status, it takes precedense over
 202                  * underflow condition.
 203                  */
 204                 if (scsi_status != 0) {
 205                         cmd->result = DID_OK << 16 | scsi_status;
 206
 207                         if (scsi_status != SCSI_CHECK_CONDITION)
 208                                 break;
 209
 210                         /* Copy Sense Data into sense buffer. */
 211                         memset(cmd->sense_buffer, 0,
 212                                sizeof(cmd->sense_buffer));
 213
 214                         sensebytecnt =
 215                                 le16_to_cpu(sts_entry->senseDataByteCnt);
 216                         if (sensebytecnt == 0)
 217                                 break;
 218
 219                         memcpy(cmd->sense_buffer, sts_entry->senseData,
 220                                min(sensebytecnt,
 221                                    (uint16_t) sizeof(cmd->sense_buffer)));
 222
 223                         DEBUG2(printk("scsi%ld:%d:%d:%d: %s: sense key = %x, "
 224                                       "ASC/ASCQ = %02x/%02x\n", ha->host_no,
 225                                       cmd->device->channel, cmd->device->id,
 226                                       cmd->device->lun, __func__,
 227                                       sts_entry->senseData[2] & 0x0f,
 228                                       sts_entry->senseData[12],
 229                                       sts_entry->senseData[13]));
 230                 } else {
 231                         /*
 232                          * If RISC reports underrun and target does not
 233                          * report it then we must have a lost frame, so
 234                          * tell upper layer to retry it by reporting a
 235                          * bus busy.
 236                          */
 237                         if ((sts_entry->iscsiFlags &
 238                              ISCSI_FLAG_RESIDUAL_UNDER) == 0) {
 239                                 cmd->result = DID_BUS_BUSY << 16;
 240                         } else if ((scsi_bufflen(cmd) - residual) <
 241                                    cmd->underflow) {
 242                                 /*
 243                                  * Handle mid-layer underflow???
 244                                  *
 245                                  * For kernels less than 2.4, the driver must
 246                                  * return an error if an underflow is detected.
 247                                  * For kernels equal-to and above 2.4, the
 248                                  * mid-layer will appearantly handle the
 249                                  * underflow by detecting the residual count --
 250                                  * unfortunately, we do not see where this is
 251                                  * actually being done.  In the interim, we
 252                                  * will return DID_ERROR.
 253                                  */
 254                                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: "
 255                                         "Mid-layer Data underrun1, "
 256                                         "xferlen = 0x%x, "
 257                                         "residual = 0x%x\n", ha->host_no,
 258                                         cmd->device->channel,
 259                                         cmd->device->id,
 260                                         cmd->device->lun, __func__,
 261                                         scsi_bufflen(cmd), residual));
 262
 263                                 cmd->result = DID_ERROR << 16;
 264                         } else {
 265                                 cmd->result = DID_OK << 16;
 266                         }
 267                 }
 268                 break;
 269
 270         case SCS_DEVICE_LOGGED_OUT:
 271         case SCS_DEVICE_UNAVAILABLE:
 272                 /*
 273                  * Mark device missing so that we won't continue to
 274                  * send I/O to this device.  We should get a ddb
 275                  * state change AEN soon.
 276                  */
 277                 if (atomic_read(&ddb_entry->state) == DDB_STATE_ONLINE)
 278                         qla4xxx_mark_device_missing(ha, ddb_entry);
 279
 280                 cmd->result = DID_BUS_BUSY << 16;
 281                 break;
 282
 283         case SCS_QUEUE_FULL:
 284                 /*
 285                  * SCSI Mid-Layer handles device queue full
 286                  */
 287                 cmd->result = DID_OK << 16 | sts_entry->scsiStatus;
 288                 DEBUG2(printk("scsi%ld:%d:%d: %s: QUEUE FULL detected "
 289                               "compl=%02x, scsi=%02x, state=%02x, iFlags=%02x,"
 290                               " iResp=%02x\n", ha->host_no, cmd->device->id,
 291                               cmd->device->lun, __func__,
 292                               sts_entry->completionStatus,
 293                               sts_entry->scsiStatus, sts_entry->state_flags,
 294                               sts_entry->iscsiFlags,
 295                               sts_entry->iscsiResponse));
 296                 break;
 297
 298         default:
 299                 cmd->result = DID_ERROR << 16;
 300                 break;
 301         }
 302
 303 status_entry_exit:
 304
 305         /* complete the request */
 306         srb->cc_stat = sts_entry->completionStatus;
 307         qla4xxx_srb_compl(ha, srb);
 308 }
 309
 310 /**
 311  * qla4xxx_process_response_queue - process response queue completions
 312  * @ha: Pointer to host adapter structure.
 313  *
 314  * This routine process response queue completions in interrupt context.
 315  * Hardware_lock locked upon entry
 316  **/
 317 static void qla4xxx_process_response_queue(struct scsi_qla_host * ha)
 318 {
 319         uint32_t count = 0;
 320         struct srb *srb = NULL;
 321         struct status_entry *sts_entry;
 322
 323         /* Process all responses from response queue */
 324         while ((ha->response_in =
 325                 (uint16_t)le32_to_cpu(ha->shadow_regs->rsp_q_in)) !=
 326                ha->response_out) {
 327                 sts_entry = (struct status_entry *) ha->response_ptr;
 328                 count++;
 329
 330                 /* Advance pointers for next entry */
 331                 if (ha->response_out == (RESPONSE_QUEUE_DEPTH - 1)) {
 332                         ha->response_out = 0;
 333                         ha->response_ptr = ha->response_ring;
 334                 } else {
 335                         ha->response_out++;
 336                         ha->response_ptr++;
 337                 }
 338
 339                 /* process entry */
 340                 switch (sts_entry->hdr.entryType) {
 341                 case ET_STATUS:
 342                         /*
 343                          * Common status - Single completion posted in single
 344                          * IOSB.
 345                          */
 346                         qla4xxx_status_entry(ha, sts_entry);
 347                         break;
 348
 349                 case ET_PASSTHRU_STATUS:
 350                         break;
 351
 352                 case ET_STATUS_CONTINUATION:
 353                         /* Just throw away the status continuation entries */
 354                         DEBUG2(printk("scsi%ld: %s: Status Continuation entry "
 355                                       "- ignoring\n", ha->host_no, __func__));
 356                         break;
 357
 358                 case ET_COMMAND:
 359                         /* ISP device queue is full. Command not
 360                          * accepted by ISP.  Queue command for
 361                          * later */
 362
 363                         srb = qla4xxx_del_from_active_array(ha,
 364                                                     le32_to_cpu(sts_entry->
 365                                                                 handle));
 366                         if (srb == NULL)
 367                                 goto exit_prq_invalid_handle;
 368
 369                         DEBUG2(printk("scsi%ld: %s: FW device queue full, "
 370                                       "srb %p\n", ha->host_no, __func__, srb));
 371
 372                         /* ETRY normally by sending it back with
 373                          * DID_BUS_BUSY */
 374                         srb->cmd->result = DID_BUS_BUSY << 16;
 375                         qla4xxx_srb_compl(ha, srb);
 376                         break;
 377
 378                 case ET_CONTINUE:
 379                         /* Just throw away the continuation entries */
 380                         DEBUG2(printk("scsi%ld: %s: Continuation entry - "
 381                                       "ignoring\n", ha->host_no, __func__));
 382                         break;
 383
 384                 default:
 385                         /*
 386                          * Invalid entry in response queue, reset RISC
 387                          * firmware.
 388                          */
 389                         DEBUG2(printk("scsi%ld: %s: Invalid entry %x in "
 390                                       "response queue \n", ha->host_no,
 391                                       __func__,
 392                                       sts_entry->hdr.entryType));
 393                         goto exit_prq_error;
 394                 }
 395         }
 396
 397         /*
 398          * Done with responses, update the ISP For QLA4010, this also clears
 399          * the interrupt.
 400          */
 401         writel(ha->response_out, &ha->reg->rsp_q_out);
 402         readl(&ha->reg->rsp_q_out);
 403
 404         return;
 405
 406 exit_prq_invalid_handle:
 407         DEBUG2(printk("scsi%ld: %s: Invalid handle(srb)=%p type=%x IOCS=%x\n",
 408                       ha->host_no, __func__, srb, sts_entry->hdr.entryType,
 409                       sts_entry->completionStatus));
 410
 411 exit_prq_error:
 412         writel(ha->response_out, &ha->reg->rsp_q_out);
 413         readl(&ha->reg->rsp_q_out);
 414
 415         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 416 }
 417
 418 /**
 419  * qla4xxx_isr_decode_mailbox - decodes mailbox status
 420  * @ha: Pointer to host adapter structure.
 421  * @mailbox_status: Mailbox status.
 422  *
 423  * This routine decodes the mailbox status during the ISR.
 424  * Hardware_lock locked upon entry. runs in interrupt context.
 425  **/
 426 static void qla4xxx_isr_decode_mailbox(struct scsi_qla_host * ha,
 427                                        uint32_t mbox_status)
 428 {
 429         int i;
 430         uint32_t mbox_stat2, mbox_stat3;
 431
 432         if ((mbox_status == MBOX_STS_BUSY) ||
 433             (mbox_status == MBOX_STS_INTERMEDIATE_COMPLETION) ||
 434             (mbox_status >> 12 == MBOX_COMPLETION_STATUS)) {
 435                 ha->mbox_status[0] = mbox_status;
 436
 437                 if (test_bit(AF_MBOX_COMMAND, &ha->flags)) {
 438                         /*
 439                          * Copy all mailbox registers to a temporary
 440                          * location and set mailbox command done flag
 441                          */
 442                         for (i = 1; i < ha->mbox_status_count; i++)
 443                                 ha->mbox_status[i] =
 444                                         readl(&ha->reg->mailbox[i]);
 445
 446                         set_bit(AF_MBOX_COMMAND_DONE, &ha->flags);
 447                 }
 448         } else if (mbox_status >> 12 == MBOX_ASYNC_EVENT_STATUS) {
 449                 /* Immediately process the AENs that don't require much work.
 450                  * Only queue the database_changed AENs */
 451                 if (ha->aen_log.count < MAX_AEN_ENTRIES) {
 452                         for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
 453                                 ha->aen_log.entry[ha->aen_log.count].mbox_sts[i] =
 454                                         readl(&ha->reg->mailbox[i]);
 455                         ha->aen_log.count++;
 456                 }
 457                 switch (mbox_status) {
 458                 case MBOX_ASTS_SYSTEM_ERROR:
 459                         /* Log Mailbox registers */
 460                         if (ql4xdontresethba) {
 461                                 DEBUG2(printk("%s:Dont Reset HBA\n",
 462                                               __func__));
 463                         } else {
 464                                 set_bit(AF_GET_CRASH_RECORD, &ha->flags);
 465                                 set_bit(DPC_RESET_HA, &ha->dpc_flags);
 466                         }
 467                         break;
 468
 469                 case MBOX_ASTS_REQUEST_TRANSFER_ERROR:
 470                 case MBOX_ASTS_RESPONSE_TRANSFER_ERROR:
 471                 case MBOX_ASTS_NVRAM_INVALID:
 472                 case MBOX_ASTS_IP_ADDRESS_CHANGED:
 473                 case MBOX_ASTS_DHCP_LEASE_EXPIRED:
 474                         DEBUG2(printk("scsi%ld: AEN %04x, ERROR Status, "
 475                                       "Reset HA\n", ha->host_no, mbox_status));
 476                         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 477                         break;
 478
 479                 case MBOX_ASTS_LINK_UP:
 480                         DEBUG2(printk("scsi%ld: AEN %04x Adapter LINK UP\n",
 481                                       ha->host_no, mbox_status));
 482                         set_bit(AF_LINK_UP, &ha->flags);
 483                         break;
 484
 485                 case MBOX_ASTS_LINK_DOWN:
 486                         DEBUG2(printk("scsi%ld: AEN %04x Adapter LINK DOWN\n",
 487                                       ha->host_no, mbox_status));
 488                         clear_bit(AF_LINK_UP, &ha->flags);
 489                         break;
 490
 491                 case MBOX_ASTS_HEARTBEAT:
 492                         ha->seconds_since_last_heartbeat = 0;
 493                         break;
 494
 495                 case MBOX_ASTS_DHCP_LEASE_ACQUIRED:
 496                         DEBUG2(printk("scsi%ld: AEN %04x DHCP LEASE "
 497                                       "ACQUIRED\n", ha->host_no, mbox_status));
 498                         set_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags);
 499                         break;
 500
 501                 case MBOX_ASTS_PROTOCOL_STATISTIC_ALARM:
 502                 case MBOX_ASTS_SCSI_COMMAND_PDU_REJECTED: /* Target
 503                                                            * mode
 504                                                            * only */
 505                 case MBOX_ASTS_UNSOLICITED_PDU_RECEIVED:  /* Connection mode */
 506                 case MBOX_ASTS_IPSEC_SYSTEM_FATAL_ERROR:
 507                 case MBOX_ASTS_SUBNET_STATE_CHANGE:
 508                         /* No action */
 509                         DEBUG2(printk("scsi%ld: AEN %04x\n", ha->host_no,
 510                                       mbox_status));
 511                         break;
 512
 513                 case MBOX_ASTS_IP_ADDR_STATE_CHANGED:
 514                         mbox_stat2 = readl(&ha->reg->mailbox[2]);
 515                         mbox_stat3 = readl(&ha->reg->mailbox[3]);
 516
 517                         if ((mbox_stat3 == 5) && (mbox_stat2 == 3))
 518                                 set_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags);
 519                         else if ((mbox_stat3 == 2) && (mbox_stat2 == 5))
 520                                 set_bit(DPC_RESET_HA, &ha->dpc_flags);
 521                         break;
 522
 523                 case MBOX_ASTS_MAC_ADDRESS_CHANGED:
 524                 case MBOX_ASTS_DNS:
 525                         /* No action */
 526                         DEBUG2(printk(KERN_INFO "scsi%ld: AEN %04x, "
 527                                       "mbox_sts[1]=%04x, mbox_sts[2]=%04x\n",
 528                                       ha->host_no, mbox_status,
 529                                       readl(&ha->reg->mailbox[1]),
 530                                       readl(&ha->reg->mailbox[2])));
 531                         break;
 532
 533                 case MBOX_ASTS_SELF_TEST_FAILED:
 534                 case MBOX_ASTS_LOGIN_FAILED:
 535                         /* No action */
 536                         DEBUG2(printk("scsi%ld: AEN %04x, mbox_sts[1]=%04x, "
 537                                       "mbox_sts[2]=%04x, mbox_sts[3]=%04x\n",
 538                                       ha->host_no, mbox_status,
 539                                       readl(&ha->reg->mailbox[1]),
 540                                       readl(&ha->reg->mailbox[2]),
 541                                       readl(&ha->reg->mailbox[3])));
 542                         break;
 543
 544                 case MBOX_ASTS_DATABASE_CHANGED:
 545                         /* Queue AEN information and process it in the DPC
 546                          * routine */
 547                         if (ha->aen_q_count > 0) {
 548
 549                                 /* decrement available counter */
 550                                 ha->aen_q_count--;
 551
 552                                 for (i = 1; i < MBOX_AEN_REG_COUNT; i++)
 553                                         ha->aen_q[ha->aen_in].mbox_sts[i] =
 554                                                 readl(&ha->reg->mailbox[i]);
 555
 556                                 ha->aen_q[ha->aen_in].mbox_sts[0] = mbox_status;
 557
 558                                 /* print debug message */
 559                                 DEBUG2(printk("scsi%ld: AEN[%d] %04x queued"
 560                                               " mb1:0x%x mb2:0x%x mb3:0x%x mb4:0x%x\n",
 561                                               ha->host_no, ha->aen_in,
 562                                               mbox_status,
 563                                               ha->aen_q[ha->aen_in].mbox_sts[1],
 564                                               ha->aen_q[ha->aen_in].mbox_sts[2],
 565                                               ha->aen_q[ha->aen_in].mbox_sts[3],
 566                                               ha->aen_q[ha->aen_in].  mbox_sts[4]));
 567                                 /* advance pointer */
 568                                 ha->aen_in++;
 569                                 if (ha->aen_in == MAX_AEN_ENTRIES)
 570                                         ha->aen_in = 0;
 571
 572                                 /* The DPC routine will process the aen */
 573                                 set_bit(DPC_AEN, &ha->dpc_flags);
 574                         } else {
 575                                 DEBUG2(printk("scsi%ld: %s: aen %04x, queue "
 576                                               "overflowed!  AEN LOST!!\n",
 577                                               ha->host_no, __func__,
 578                                               mbox_status));
 579
 580                                 DEBUG2(printk("scsi%ld: DUMP AEN QUEUE\n",
 581                                               ha->host_no));
 582
 583                                 for (i = 0; i < MAX_AEN_ENTRIES; i++) {
 584                                         DEBUG2(printk("AEN[%d] %04x %04x %04x "
 585                                                       "%04x\n", i,
 586                                                       ha->aen_q[i].mbox_sts[0],
 587                                                       ha->aen_q[i].mbox_sts[1],
 588                                                       ha->aen_q[i].mbox_sts[2],
 589                                                       ha->aen_q[i].mbox_sts[3]));
 590                                 }
 591                         }
 592                         break;
 593
 594                 default:
 595                         DEBUG2(printk(KERN_WARNING
 596                                       "scsi%ld: AEN %04x UNKNOWN\n",
 597                                       ha->host_no, mbox_status));
 598                         break;
 599                 }
 600         } else {
 601                 DEBUG2(printk("scsi%ld: Unknown mailbox status %08X\n",
 602                               ha->host_no, mbox_status));
 603
 604                 ha->mbox_status[0] = mbox_status;
 605         }
 606 }
 607
 608 /**
 609  * qla4xxx_interrupt_service_routine - isr
 610  * @ha: pointer to host adapter structure.
 611  *
 612  * This is the main interrupt service routine.
 613  * hardware_lock locked upon entry. runs in interrupt context.
 614  **/
 615 void qla4xxx_interrupt_service_routine(struct scsi_qla_host * ha,
 616                                        uint32_t intr_status)
 617 {
 618         /* Process response queue interrupt. */
 619         if (intr_status & CSR_SCSI_COMPLETION_INTR)
 620                 qla4xxx_process_response_queue(ha);
 621
 622         /* Process mailbox/asynch event  interrupt.*/
 623         if (intr_status & CSR_SCSI_PROCESSOR_INTR) {
 624                 qla4xxx_isr_decode_mailbox(ha,
 625                                            readl(&ha->reg->mailbox[0]));
 626
 627                 /* Clear Mailbox Interrupt */
 628                 writel(set_rmask(CSR_SCSI_PROCESSOR_INTR),
 629                        &ha->reg->ctrl_status);
 630                 readl(&ha->reg->ctrl_status);
 631         }
 632 }
 633
 634 /**
 635  * qla4xxx_intr_handler - hardware interrupt handler.
 636  * @irq: Unused
 637  * @dev_id: Pointer to host adapter structure
 638  **/
 639 irqreturn_t qla4xxx_intr_handler(int irq, void *dev_id)
 640 {
 641         struct scsi_qla_host *ha;
 642         uint32_t intr_status;
 643         unsigned long flags = 0;
 644         uint8_t reqs_count = 0;
 645
 646         ha = (struct scsi_qla_host *) dev_id;
 647         if (!ha) {
 648                 DEBUG2(printk(KERN_INFO
 649                               "qla4xxx: Interrupt with NULL host ptr\n"));
 650                 return IRQ_NONE;
 651         }
 652
 653         spin_lock_irqsave(&ha->hardware_lock, flags);
 654
 655         ha->isr_count++;
 656         /*
 657          * Repeatedly service interrupts up to a maximum of
 658          * MAX_REQS_SERVICED_PER_INTR
 659          */
 660         while (1) {
 661                 /*
 662                  * Read interrupt status
 663                  */
 664                 if (le32_to_cpu(ha->shadow_regs->rsp_q_in) !=
 665                     ha->response_out)
 666                         intr_status = CSR_SCSI_COMPLETION_INTR;
 667                 else
 668                         intr_status = readl(&ha->reg->ctrl_status);
 669
 670                 if ((intr_status &
 671                      (CSR_SCSI_RESET_INTR|CSR_FATAL_ERROR|INTR_PENDING)) ==
 672                     0) {
 673                         if (reqs_count == 0)
 674                                 ha->spurious_int_count++;
 675                         break;
 676                 }
 677
 678                 if (intr_status & CSR_FATAL_ERROR) {
 679                         DEBUG2(printk(KERN_INFO "scsi%ld: Fatal Error, "
 680                                       "Status 0x%04x\n", ha->host_no,
 681                                       readl(isp_port_error_status (ha))));
 682
 683                         /* Issue Soft Reset to clear this error condition.
 684                          * This will prevent the RISC from repeatedly
 685                          * interrupting the driver; thus, allowing the DPC to
 686                          * get scheduled to continue error recovery.
 687                          * NOTE: Disabling RISC interrupts does not work in
 688                          * this case, as CSR_FATAL_ERROR overrides
 689                          * CSR_SCSI_INTR_ENABLE */
 690                         if ((readl(&ha->reg->ctrl_status) &
 691                              CSR_SCSI_RESET_INTR) == 0) {
 692                                 writel(set_rmask(CSR_SOFT_RESET),
 693                                        &ha->reg->ctrl_status);
 694                                 readl(&ha->reg->ctrl_status);
 695                         }
 696
 697                         writel(set_rmask(CSR_FATAL_ERROR),
 698                                &ha->reg->ctrl_status);
 699                         readl(&ha->reg->ctrl_status);
 700
 701                         __qla4xxx_disable_intrs(ha);
 702
 703                         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 704
 705                         break;
 706                 } else if (intr_status & CSR_SCSI_RESET_INTR) {
 707                         clear_bit(AF_ONLINE, &ha->flags);
 708                         __qla4xxx_disable_intrs(ha);
 709
 710                         writel(set_rmask(CSR_SCSI_RESET_INTR),
 711                                &ha->reg->ctrl_status);
 712                         readl(&ha->reg->ctrl_status);
 713
 714                         if (!ql4_mod_unload)
 715                                 set_bit(DPC_RESET_HA_INTR, &ha->dpc_flags);
 716
 717                         break;
 718                 } else if (intr_status & INTR_PENDING) {
 719                         qla4xxx_interrupt_service_routine(ha, intr_status);
 720                         ha->total_io_count++;
 721                         if (++reqs_count == MAX_REQS_SERVICED_PER_INTR)
 722                                 break;
 723
 724                         intr_status = 0;
 725                 }
 726         }
 727
 728         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 729
 730         return IRQ_HANDLED;
 731 }
 732
 733 /**
 734  * qla4xxx_process_aen - processes AENs generated by firmware
 735  * @ha: pointer to host adapter structure.
 736  * @process_aen: type of AENs to process
 737  *
 738  * Processes specific types of Asynchronous Events generated by firmware.
 739  * The type of AENs to process is specified by process_aen and can be
 740  *      PROCESS_ALL_AENS         0
 741  *      FLUSH_DDB_CHANGED_AENS   1
 742  *      RELOGIN_DDB_CHANGED_AENS 2
 743  **/
 744 void qla4xxx_process_aen(struct scsi_qla_host * ha, uint8_t process_aen)
 745 {
 746         uint32_t mbox_sts[MBOX_AEN_REG_COUNT];
 747         struct aen *aen;
 748         int i;
 749         unsigned long flags;
 750
 751         spin_lock_irqsave(&ha->hardware_lock, flags);
 752         while (ha->aen_out != ha->aen_in) {
 753                 aen = &ha->aen_q[ha->aen_out];
 754                 /* copy aen information to local structure */
 755                 for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
 756                         mbox_sts[i] = aen->mbox_sts[i];
 757
 758                 ha->aen_q_count++;
 759                 ha->aen_out++;
 760
 761                 if (ha->aen_out == MAX_AEN_ENTRIES)
 762                         ha->aen_out = 0;
 763
 764                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 765
 766                 DEBUG2(printk("qla4xxx(%ld): AEN[%d]=0x%08x, mbx1=0x%08x mbx2=0x%08x"
 767                         " mbx3=0x%08x mbx4=0x%08x\n", ha->host_no,
 768                         (ha->aen_out ? (ha->aen_out-1): (MAX_AEN_ENTRIES-1)),
 769                         mbox_sts[0], mbox_sts[1], mbox_sts[2],
 770                         mbox_sts[3], mbox_sts[4]));
 771
 772                 switch (mbox_sts[0]) {
 773                 case MBOX_ASTS_DATABASE_CHANGED:
 774                         if (process_aen == FLUSH_DDB_CHANGED_AENS) {
 775                                 DEBUG2(printk("scsi%ld: AEN[%d] %04x, index "
 776                                               "[%d] state=%04x FLUSHED!\n",
 777                                               ha->host_no, ha->aen_out,
 778                                               mbox_sts[0], mbox_sts[2],
 779                                               mbox_sts[3]));
 780                                 break;
 781                         } else if (process_aen == RELOGIN_DDB_CHANGED_AENS) {
 782                                 /* for use during init time, we only want to
 783                                  * relogin non-active ddbs */
 784                                 struct ddb_entry *ddb_entry;
 785
 786                                 ddb_entry =
 787                                         /* FIXME: name length? */
 788                                         qla4xxx_lookup_ddb_by_fw_index(ha,
 789                                                                        mbox_sts[2]);
 790                                 if (!ddb_entry)
 791                                         break;
 792
 793                                 ddb_entry->dev_scan_wait_to_complete_relogin =
 794                                         0;
 795                                 ddb_entry->dev_scan_wait_to_start_relogin =
 796                                         jiffies +
 797                                         ((ddb_entry->default_time2wait +
 798                                           4) * HZ);
 799
 800                                 DEBUG2(printk("scsi%ld: ddb index [%d] initate"
 801                                               " RELOGIN after %d seconds\n",
 802                                               ha->host_no,
 803                                               ddb_entry->fw_ddb_index,
 804                                               ddb_entry->default_time2wait +
 805                                               4));
 806                                 break;
 807                         }
 808
 809                         if (mbox_sts[1] == 0) { /* Global DB change. */
 810                                 qla4xxx_reinitialize_ddb_list(ha);
 811                         } else if (mbox_sts[1] == 1) {  /* Specific device. */
 812                                 qla4xxx_process_ddb_changed(ha, mbox_sts[2],
 813                                                             mbox_sts[3]);
 814                         }
 815                         break;
 816                 }
 817                 spin_lock_irqsave(&ha->hardware_lock, flags);
 818         }
 819         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 820 }
 821