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_copy_sense - copy sense data into cmd sense buffer
  15  * @ha: Pointer to host adapter structure.
  16  * @sts_entry: Pointer to status entry structure.
  17  * @srb: Pointer to srb structure.
  18  **/
  19 static void qla4xxx_copy_sense(struct scsi_qla_host *ha,
  20                                struct status_entry *sts_entry,
  21                                struct srb *srb)
  22 {
  23         struct scsi_cmnd *cmd = srb->cmd;
  24         uint16_t sense_len;
  25
  26         memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
  27         sense_len = le16_to_cpu(sts_entry->senseDataByteCnt);
  28         if (sense_len == 0)
  29                 return;
  30
  31         /* Save total available sense length,
  32          * not to exceed cmd's sense buffer size */
  33         sense_len = min_t(uint16_t, sense_len, SCSI_SENSE_BUFFERSIZE);
  34         srb->req_sense_ptr = cmd->sense_buffer;
  35         srb->req_sense_len = sense_len;
  36
  37         /* Copy sense from sts_entry pkt */
  38         sense_len = min_t(uint16_t, sense_len, IOCB_MAX_SENSEDATA_LEN);
  39         memcpy(cmd->sense_buffer, sts_entry->senseData, sense_len);
  40
  41         DEBUG2(printk(KERN_INFO "scsi%ld:%d:%d:%d: %s: sense key = %x, "
  42                 "ASL= %02x, ASC/ASCQ = %02x/%02x\n", ha->host_no,
  43                 cmd->device->channel, cmd->device->id,
  44                 cmd->device->lun, __func__,
  45                 sts_entry->senseData[2] & 0x0f,
  46                 sts_entry->senseData[7],
  47                 sts_entry->senseData[12],
  48                 sts_entry->senseData[13]));
  49
  50         DEBUG5(qla4xxx_dump_buffer(cmd->sense_buffer, sense_len));
  51         srb->flags |= SRB_GOT_SENSE;
  52
  53         /* Update srb, in case a sts_cont pkt follows */
  54         srb->req_sense_ptr += sense_len;
  55         srb->req_sense_len -= sense_len;
  56         if (srb->req_sense_len != 0)
  57                 ha->status_srb = srb;
  58         else
  59                 ha->status_srb = NULL;
  60 }
  61
  62 /**
  63  * qla4xxx_status_cont_entry - Process a Status Continuations entry.
  64  * @ha: SCSI driver HA context
  65  * @sts_cont: Entry pointer
  66  *
  67  * Extended sense data.
  68  */
  69 static void
  70 qla4xxx_status_cont_entry(struct scsi_qla_host *ha,
  71                           struct status_cont_entry *sts_cont)
  72 {
  73         struct srb *srb = ha->status_srb;
  74         struct scsi_cmnd *cmd;
  75         uint8_t sense_len;
  76
  77         if (srb == NULL)
  78                 return;
  79
  80         cmd = srb->cmd;
  81         if (cmd == NULL) {
  82                 DEBUG2(printk(KERN_INFO "scsi%ld: %s: Cmd already returned "
  83                         "back to OS srb=%p srb->state:%d\n", ha->host_no,
  84                         __func__, srb, srb->state));
  85                 ha->status_srb = NULL;
  86                 return;
  87         }
  88
  89         /* Copy sense data. */
  90         sense_len = min_t(uint16_t, srb->req_sense_len,
  91                           IOCB_MAX_EXT_SENSEDATA_LEN);
  92         memcpy(srb->req_sense_ptr, sts_cont->ext_sense_data, sense_len);
  93         DEBUG5(qla4xxx_dump_buffer(srb->req_sense_ptr, sense_len));
  94
  95         srb->req_sense_ptr += sense_len;
  96         srb->req_sense_len -= sense_len;
  97
  98         /* Place command on done queue. */
  99         if (srb->req_sense_len == 0) {
 100                 kref_put(&srb->srb_ref, qla4xxx_srb_compl);
 101                 ha->status_srb = NULL;
 102         }
 103 }
 104
 105 /**
 106  * qla4xxx_status_entry - processes status IOCBs
 107  * @ha: Pointer to host adapter structure.
 108  * @sts_entry: Pointer to status entry structure.
 109  **/
 110 static void qla4xxx_status_entry(struct scsi_qla_host *ha,
 111                                  struct status_entry *sts_entry)
 112 {
 113         uint8_t scsi_status;
 114         struct scsi_cmnd *cmd;
 115         struct srb *srb;
 116         struct ddb_entry *ddb_entry;
 117         uint32_t residual;
 118
 119         srb = qla4xxx_del_from_active_array(ha, le32_to_cpu(sts_entry->handle));
 120         if (!srb) {
 121                 DEBUG2(printk(KERN_WARNING "scsi%ld: %s: Status Entry invalid "
 122                               "handle 0x%x, sp=%p. This cmd may have already "
 123                               "been completed.\n", ha->host_no, __func__,
 124                               le32_to_cpu(sts_entry->handle), srb));
 125                 ql4_printk(KERN_WARNING, ha, "%s invalid status entry:"
 126                     " handle=0x%0x\n", __func__, sts_entry->handle);
 127                 set_bit(DPC_RESET_HA, &ha->dpc_flags);
 128                 return;
 129         }
 130
 131         cmd = srb->cmd;
 132         if (cmd == NULL) {
 133                 DEBUG2(printk("scsi%ld: %s: Command already returned back to "
 134                               "OS pkt->handle=%d srb=%p srb->state:%d\n",
 135                               ha->host_no, __func__, sts_entry->handle,
 136                               srb, srb->state));
 137                 ql4_printk(KERN_WARNING, ha, "Command is NULL:"
 138                     " already returned to OS (srb=%p)\n", srb);
 139                 return;
 140         }
 141
 142         ddb_entry = srb->ddb;
 143         if (ddb_entry == NULL) {
 144                 cmd->result = DID_NO_CONNECT << 16;
 145                 goto status_entry_exit;
 146         }
 147
 148         residual = le32_to_cpu(sts_entry->residualByteCnt);
 149
 150         /* Translate ISP error to a Linux SCSI error. */
 151         scsi_status = sts_entry->scsiStatus;
 152         switch (sts_entry->completionStatus) {
 153         case SCS_COMPLETE:
 154
 155                 if (sts_entry->iscsiFlags & ISCSI_FLAG_RESIDUAL_OVER) {
 156                         cmd->result = DID_ERROR << 16;
 157                         break;
 158                 }
 159
 160                 if (sts_entry->iscsiFlags &ISCSI_FLAG_RESIDUAL_UNDER) {
 161                         scsi_set_resid(cmd, residual);
 162                         if (!scsi_status && ((scsi_bufflen(cmd) - residual) <
 163                                 cmd->underflow)) {
 164
 165                                 cmd->result = DID_ERROR << 16;
 166
 167                                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: "
 168                                         "Mid-layer Data underrun0, "
 169                                         "xferlen = 0x%x, "
 170                                         "residual = 0x%x\n", ha->host_no,
 171                                         cmd->device->channel,
 172                                         cmd->device->id,
 173                                         cmd->device->lun, __func__,
 174                                         scsi_bufflen(cmd), residual));
 175                                 break;
 176                         }
 177                 }
 178
 179                 cmd->result = DID_OK << 16 | scsi_status;
 180
 181                 if (scsi_status != SCSI_CHECK_CONDITION)
 182                         break;
 183
 184                 /* Copy Sense Data into sense buffer. */
 185                 qla4xxx_copy_sense(ha, sts_entry, srb);
 186                 break;
 187
 188         case SCS_INCOMPLETE:
 189                 /* Always set the status to DID_ERROR, since
 190                  * all conditions result in that status anyway */
 191                 cmd->result = DID_ERROR << 16;
 192                 break;
 193
 194         case SCS_RESET_OCCURRED:
 195                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: Device RESET occurred\n",
 196                               ha->host_no, cmd->device->channel,
 197                               cmd->device->id, cmd->device->lun, __func__));
 198
 199                 cmd->result = DID_RESET << 16;
 200                 break;
 201
 202         case SCS_ABORTED:
 203                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: Abort occurred\n",
 204                               ha->host_no, cmd->device->channel,
 205                               cmd->device->id, cmd->device->lun, __func__));
 206
 207                 cmd->result = DID_RESET << 16;
 208                 break;
 209
 210         case SCS_TIMEOUT:
 211                 DEBUG2(printk(KERN_INFO "scsi%ld:%d:%d:%d: Timeout\n",
 212                               ha->host_no, cmd->device->channel,
 213                               cmd->device->id, cmd->device->lun));
 214
 215                 cmd->result = DID_TRANSPORT_DISRUPTED << 16;
 216
 217                 /*
 218                  * Mark device missing so that we won't continue to send
 219                  * I/O to this device.  We should get a ddb state change
 220                  * AEN soon.
 221                  */
 222                 if (atomic_read(&ddb_entry->state) == DDB_STATE_ONLINE)
 223                         qla4xxx_mark_device_missing(ha, ddb_entry);
 224                 break;
 225
 226         case SCS_DATA_UNDERRUN:
 227         case SCS_DATA_OVERRUN:
 228                 if ((sts_entry->iscsiFlags & ISCSI_FLAG_RESIDUAL_OVER) ||
 229                      (sts_entry->completionStatus == SCS_DATA_OVERRUN)) {
 230                         DEBUG2(printk("scsi%ld:%d:%d:%d: %s: " "Data overrun\n",
 231                                       ha->host_no,
 232                                       cmd->device->channel, cmd->device->id,
 233                                       cmd->device->lun, __func__));
 234
 235                         cmd->result = DID_ERROR << 16;
 236                         break;
 237                 }
 238
 239                 scsi_set_resid(cmd, residual);
 240
 241                 /*
 242                  * If there is scsi_status, it takes precedense over
 243                  * underflow condition.
 244                  */
 245                 if (scsi_status != 0) {
 246                         cmd->result = DID_OK << 16 | scsi_status;
 247
 248                         if (scsi_status != SCSI_CHECK_CONDITION)
 249                                 break;
 250
 251                         /* Copy Sense Data into sense buffer. */
 252                         qla4xxx_copy_sense(ha, sts_entry, srb);
 253                 } else {
 254                         /*
 255                          * If RISC reports underrun and target does not
 256                          * report it then we must have a lost frame, so
 257                          * tell upper layer to retry it by reporting a
 258                          * bus busy.
 259                          */
 260                         if ((sts_entry->iscsiFlags &
 261                              ISCSI_FLAG_RESIDUAL_UNDER) == 0) {
 262                                 cmd->result = DID_BUS_BUSY << 16;
 263                         } else if ((scsi_bufflen(cmd) - residual) <
 264                                    cmd->underflow) {
 265                                 /*
 266                                  * Handle mid-layer underflow???
 267                                  *
 268                                  * For kernels less than 2.4, the driver must
 269                                  * return an error if an underflow is detected.
 270                                  * For kernels equal-to and above 2.4, the
 271                                  * mid-layer will appearantly handle the
 272                                  * underflow by detecting the residual count --
 273                                  * unfortunately, we do not see where this is
 274                                  * actually being done.  In the interim, we
 275                                  * will return DID_ERROR.
 276                                  */
 277                                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: "
 278                                         "Mid-layer Data underrun1, "
 279                                         "xferlen = 0x%x, "
 280                                         "residual = 0x%x\n", ha->host_no,
 281                                         cmd->device->channel,
 282                                         cmd->device->id,
 283                                         cmd->device->lun, __func__,
 284                                         scsi_bufflen(cmd), residual));
 285
 286                                 cmd->result = DID_ERROR << 16;
 287                         } else {
 288                                 cmd->result = DID_OK << 16;
 289                         }
 290                 }
 291                 break;
 292
 293         case SCS_DEVICE_LOGGED_OUT:
 294         case SCS_DEVICE_UNAVAILABLE:
 295                 DEBUG2(printk(KERN_INFO "scsi%ld:%d:%d:%d: SCS_DEVICE "
 296                     "state: 0x%x\n", ha->host_no,
 297                     cmd->device->channel, cmd->device->id,
 298                     cmd->device->lun, sts_entry->completionStatus));
 299                 /*
 300                  * Mark device missing so that we won't continue to
 301                  * send I/O to this device.  We should get a ddb
 302                  * state change AEN soon.
 303                  */
 304                 if (atomic_read(&ddb_entry->state) == DDB_STATE_ONLINE)
 305                         qla4xxx_mark_device_missing(ha, ddb_entry);
 306
 307                 cmd->result = DID_TRANSPORT_DISRUPTED << 16;
 308                 break;
 309
 310         case SCS_QUEUE_FULL:
 311                 /*
 312                  * SCSI Mid-Layer handles device queue full
 313                  */
 314                 cmd->result = DID_OK << 16 | sts_entry->scsiStatus;
 315                 DEBUG2(printk("scsi%ld:%d:%d: %s: QUEUE FULL detected "
 316                               "compl=%02x, scsi=%02x, state=%02x, iFlags=%02x,"
 317                               " iResp=%02x\n", ha->host_no, cmd->device->id,
 318                               cmd->device->lun, __func__,
 319                               sts_entry->completionStatus,
 320                               sts_entry->scsiStatus, sts_entry->state_flags,
 321                               sts_entry->iscsiFlags,
 322                               sts_entry->iscsiResponse));
 323                 break;
 324
 325         default:
 326                 cmd->result = DID_ERROR << 16;
 327                 break;
 328         }
 329
 330 status_entry_exit:
 331
 332         /* complete the request, if not waiting for status_continuation pkt */
 333         srb->cc_stat = sts_entry->completionStatus;
 334         if (ha->status_srb == NULL)
 335                 kref_put(&srb->srb_ref, qla4xxx_srb_compl);
 336 }
 337
 338 /**
 339  * qla4xxx_process_response_queue - process response queue completions
 340  * @ha: Pointer to host adapter structure.
 341  *
 342  * This routine process response queue completions in interrupt context.
 343  * Hardware_lock locked upon entry
 344  **/
 345 void qla4xxx_process_response_queue(struct scsi_qla_host *ha)
 346 {
 347         uint32_t count = 0;
 348         struct srb *srb = NULL;
 349         struct status_entry *sts_entry;
 350
 351         /* Process all responses from response queue */
 352         while ((ha->response_ptr->signature != RESPONSE_PROCESSED)) {
 353                 sts_entry = (struct status_entry *) ha->response_ptr;
 354                 count++;
 355
 356                 /* Advance pointers for next entry */
 357                 if (ha->response_out == (RESPONSE_QUEUE_DEPTH - 1)) {
 358                         ha->response_out = 0;
 359                         ha->response_ptr = ha->response_ring;
 360                 } else {
 361                         ha->response_out++;
 362                         ha->response_ptr++;
 363                 }
 364
 365                 /* process entry */
 366                 switch (sts_entry->hdr.entryType) {
 367                 case ET_STATUS:
 368                         /* Common status */
 369                         qla4xxx_status_entry(ha, sts_entry);
 370                         break;
 371
 372                 case ET_PASSTHRU_STATUS:
 373                         break;
 374
 375                 case ET_STATUS_CONTINUATION:
 376                         qla4xxx_status_cont_entry(ha,
 377                                 (struct status_cont_entry *) sts_entry);
 378                         break;
 379
 380                 case ET_COMMAND:
 381                         /* ISP device queue is full. Command not
 382                          * accepted by ISP.  Queue command for
 383                          * later */
 384
 385                         srb = qla4xxx_del_from_active_array(ha,
 386                                                     le32_to_cpu(sts_entry->
 387                                                                 handle));
 388                         if (srb == NULL)
 389                                 goto exit_prq_invalid_handle;
 390
 391                         DEBUG2(printk("scsi%ld: %s: FW device queue full, "
 392                                       "srb %p\n", ha->host_no, __func__, srb));
 393
 394                         /* ETRY normally by sending it back with
 395                          * DID_BUS_BUSY */
 396                         srb->cmd->result = DID_BUS_BUSY << 16;
 397                         kref_put(&srb->srb_ref, qla4xxx_srb_compl);
 398                         break;
 399
 400                 case ET_CONTINUE:
 401                         /* Just throw away the continuation entries */
 402                         DEBUG2(printk("scsi%ld: %s: Continuation entry - "
 403                                       "ignoring\n", ha->host_no, __func__));
 404                         break;
 405
 406                 default:
 407                         /*
 408                          * Invalid entry in response queue, reset RISC
 409                          * firmware.
 410                          */
 411                         DEBUG2(printk("scsi%ld: %s: Invalid entry %x in "
 412                                       "response queue \n", ha->host_no,
 413                                       __func__,
 414                                       sts_entry->hdr.entryType));
 415                         goto exit_prq_error;
 416                 }
 417                 ((struct response *)sts_entry)->signature = RESPONSE_PROCESSED;
 418                 wmb();
 419         }
 420
 421         /*
 422          * Tell ISP we're done with response(s). This also clears the interrupt.
 423          */
 424         ha->isp_ops->complete_iocb(ha);
 425
 426         return;
 427
 428 exit_prq_invalid_handle:
 429         DEBUG2(printk("scsi%ld: %s: Invalid handle(srb)=%p type=%x IOCS=%x\n",
 430                       ha->host_no, __func__, srb, sts_entry->hdr.entryType,
 431                       sts_entry->completionStatus));
 432
 433 exit_prq_error:
 434         ha->isp_ops->complete_iocb(ha);
 435         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 436 }
 437
 438 /**
 439  * qla4xxx_isr_decode_mailbox - decodes mailbox status
 440  * @ha: Pointer to host adapter structure.
 441  * @mailbox_status: Mailbox status.
 442  *
 443  * This routine decodes the mailbox status during the ISR.
 444  * Hardware_lock locked upon entry. runs in interrupt context.
 445  **/
 446 static void qla4xxx_isr_decode_mailbox(struct scsi_qla_host * ha,
 447                                        uint32_t mbox_status)
 448 {
 449         int i;
 450         uint32_t mbox_sts[MBOX_AEN_REG_COUNT];
 451
 452         if ((mbox_status == MBOX_STS_BUSY) ||
 453             (mbox_status == MBOX_STS_INTERMEDIATE_COMPLETION) ||
 454             (mbox_status >> 12 == MBOX_COMPLETION_STATUS)) {
 455                 ha->mbox_status[0] = mbox_status;
 456
 457                 if (test_bit(AF_MBOX_COMMAND, &ha->flags)) {
 458                         /*
 459                          * Copy all mailbox registers to a temporary
 460                          * location and set mailbox command done flag
 461                          */
 462                         for (i = 0; i < ha->mbox_status_count; i++)
 463                                 ha->mbox_status[i] = is_qla8022(ha)
 464                                     ? readl(&ha->qla4_8xxx_reg->mailbox_out[i])
 465                                     : readl(&ha->reg->mailbox[i]);
 466
 467                         set_bit(AF_MBOX_COMMAND_DONE, &ha->flags);
 468
 469                         if (test_bit(AF_MBOX_COMMAND_NOPOLL, &ha->flags))
 470                                 complete(&ha->mbx_intr_comp);
 471                 }
 472         } else if (mbox_status >> 12 == MBOX_ASYNC_EVENT_STATUS) {
 473                 for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
 474                         mbox_sts[i] = is_qla8022(ha)
 475                             ? readl(&ha->qla4_8xxx_reg->mailbox_out[i])
 476                             : readl(&ha->reg->mailbox[i]);
 477
 478                 /* Immediately process the AENs that don't require much work.
 479                  * Only queue the database_changed AENs */
 480                 if (ha->aen_log.count < MAX_AEN_ENTRIES) {
 481                         for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
 482                                 ha->aen_log.entry[ha->aen_log.count].mbox_sts[i] =
 483                                     mbox_sts[i];
 484                         ha->aen_log.count++;
 485                 }
 486                 switch (mbox_status) {
 487                 case MBOX_ASTS_SYSTEM_ERROR:
 488                         /* Log Mailbox registers */
 489                         ql4_printk(KERN_INFO, ha, "%s: System Err\n", __func__);
 490                         if (ql4xdontresethba) {
 491                                 DEBUG2(printk("scsi%ld: %s:Don't Reset HBA\n",
 492                                     ha->host_no, __func__));
 493                         } else {
 494                                 set_bit(AF_GET_CRASH_RECORD, &ha->flags);
 495                                 set_bit(DPC_RESET_HA, &ha->dpc_flags);
 496                         }
 497                         break;
 498
 499                 case MBOX_ASTS_REQUEST_TRANSFER_ERROR:
 500                 case MBOX_ASTS_RESPONSE_TRANSFER_ERROR:
 501                 case MBOX_ASTS_NVRAM_INVALID:
 502                 case MBOX_ASTS_IP_ADDRESS_CHANGED:
 503                 case MBOX_ASTS_DHCP_LEASE_EXPIRED:
 504                         DEBUG2(printk("scsi%ld: AEN %04x, ERROR Status, "
 505                                       "Reset HA\n", ha->host_no, mbox_status));
 506                         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 507                         break;
 508
 509                 case MBOX_ASTS_LINK_UP:
 510                         set_bit(AF_LINK_UP, &ha->flags);
 511                         if (test_bit(AF_INIT_DONE, &ha->flags))
 512                                 set_bit(DPC_LINK_CHANGED, &ha->dpc_flags);
 513
 514                         ql4_printk(KERN_INFO, ha, "%s: LINK UP\n", __func__);
 515                         break;
 516
 517                 case MBOX_ASTS_LINK_DOWN:
 518                         clear_bit(AF_LINK_UP, &ha->flags);
 519                         if (test_bit(AF_INIT_DONE, &ha->flags))
 520                                 set_bit(DPC_LINK_CHANGED, &ha->dpc_flags);
 521
 522                         ql4_printk(KERN_INFO, ha, "%s: LINK DOWN\n", __func__);
 523                         break;
 524
 525                 case MBOX_ASTS_HEARTBEAT:
 526                         ha->seconds_since_last_heartbeat = 0;
 527                         break;
 528
 529                 case MBOX_ASTS_DHCP_LEASE_ACQUIRED:
 530                         DEBUG2(printk("scsi%ld: AEN %04x DHCP LEASE "
 531                                       "ACQUIRED\n", ha->host_no, mbox_status));
 532                         set_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags);
 533                         break;
 534
 535                 case MBOX_ASTS_PROTOCOL_STATISTIC_ALARM:
 536                 case MBOX_ASTS_SCSI_COMMAND_PDU_REJECTED: /* Target
 537                                                            * mode
 538                                                            * only */
 539                 case MBOX_ASTS_UNSOLICITED_PDU_RECEIVED:  /* Connection mode */
 540                 case MBOX_ASTS_IPSEC_SYSTEM_FATAL_ERROR:
 541                 case MBOX_ASTS_SUBNET_STATE_CHANGE:
 542                         /* No action */
 543                         DEBUG2(printk("scsi%ld: AEN %04x\n", ha->host_no,
 544                                       mbox_status));
 545                         break;
 546
 547                 case MBOX_ASTS_IP_ADDR_STATE_CHANGED:
 548                         printk("scsi%ld: AEN %04x, mbox_sts[2]=%04x, "
 549                             "mbox_sts[3]=%04x\n", ha->host_no, mbox_sts[0],
 550                             mbox_sts[2], mbox_sts[3]);
 551
 552                         /* mbox_sts[2] = Old ACB state
 553                          * mbox_sts[3] = new ACB state */
 554                         if ((mbox_sts[3] == ACB_STATE_VALID) &&
 555                             (mbox_sts[2] == ACB_STATE_TENTATIVE))
 556                                 set_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags);
 557                         else if ((mbox_sts[3] == ACB_STATE_ACQUIRING) &&
 558                             (mbox_sts[2] == ACB_STATE_VALID))
 559                                 set_bit(DPC_RESET_HA, &ha->dpc_flags);
 560                         break;
 561
 562                 case MBOX_ASTS_MAC_ADDRESS_CHANGED:
 563                 case MBOX_ASTS_DNS:
 564                         /* No action */
 565                         DEBUG2(printk(KERN_INFO "scsi%ld: AEN %04x, "
 566                                       "mbox_sts[1]=%04x, mbox_sts[2]=%04x\n",
 567                                       ha->host_no, mbox_sts[0],
 568                                       mbox_sts[1], mbox_sts[2]));
 569                         break;
 570
 571                 case MBOX_ASTS_SELF_TEST_FAILED:
 572                 case MBOX_ASTS_LOGIN_FAILED:
 573                         /* No action */
 574                         DEBUG2(printk("scsi%ld: AEN %04x, mbox_sts[1]=%04x, "
 575                                       "mbox_sts[2]=%04x, mbox_sts[3]=%04x\n",
 576                                       ha->host_no, mbox_sts[0], mbox_sts[1],
 577                                       mbox_sts[2], mbox_sts[3]));
 578                         break;
 579
 580                 case MBOX_ASTS_DATABASE_CHANGED:
 581                         /* Queue AEN information and process it in the DPC
 582                          * routine */
 583                         if (ha->aen_q_count > 0) {
 584
 585                                 /* decrement available counter */
 586                                 ha->aen_q_count--;
 587
 588                                 for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
 589                                         ha->aen_q[ha->aen_in].mbox_sts[i] =
 590                                             mbox_sts[i];
 591
 592                                 /* print debug message */
 593                                 DEBUG2(printk("scsi%ld: AEN[%d] %04x queued"
 594                                     " mb1:0x%x mb2:0x%x mb3:0x%x mb4:0x%x\n",
 595                                     ha->host_no, ha->aen_in, mbox_sts[0],
 596                                     mbox_sts[1], mbox_sts[2],  mbox_sts[3],
 597                                     mbox_sts[4]));
 598
 599                                 /* advance pointer */
 600                                 ha->aen_in++;
 601                                 if (ha->aen_in == MAX_AEN_ENTRIES)
 602                                         ha->aen_in = 0;
 603
 604                                 /* The DPC routine will process the aen */
 605                                 set_bit(DPC_AEN, &ha->dpc_flags);
 606                         } else {
 607                                 DEBUG2(printk("scsi%ld: %s: aen %04x, queue "
 608                                               "overflowed!  AEN LOST!!\n",
 609                                               ha->host_no, __func__,
 610                                               mbox_sts[0]));
 611
 612                                 DEBUG2(printk("scsi%ld: DUMP AEN QUEUE\n",
 613                                               ha->host_no));
 614
 615                                 for (i = 0; i < MAX_AEN_ENTRIES; i++) {
 616                                         DEBUG2(printk("AEN[%d] %04x %04x %04x "
 617                                                       "%04x\n", i, mbox_sts[0],
 618                                                       mbox_sts[1], mbox_sts[2],
 619                                                       mbox_sts[3]));
 620                                 }
 621                         }
 622                         break;
 623
 624                 default:
 625                         DEBUG2(printk(KERN_WARNING
 626                                       "scsi%ld: AEN %04x UNKNOWN\n",
 627                                       ha->host_no, mbox_sts[0]));
 628                         break;
 629                 }
 630         } else {
 631                 DEBUG2(printk("scsi%ld: Unknown mailbox status %08X\n",
 632                               ha->host_no, mbox_status));
 633
 634                 ha->mbox_status[0] = mbox_status;
 635         }
 636 }
 637
 638 /**
 639  * qla4_8xxx_interrupt_service_routine - isr
 640  * @ha: pointer to host adapter structure.
 641  *
 642  * This is the main interrupt service routine.
 643  * hardware_lock locked upon entry. runs in interrupt context.
 644  **/
 645 void qla4_8xxx_interrupt_service_routine(struct scsi_qla_host *ha,
 646     uint32_t intr_status)
 647 {
 648         /* Process response queue interrupt. */
 649         if (intr_status & HSRX_RISC_IOCB_INT)
 650                 qla4xxx_process_response_queue(ha);
 651
 652         /* Process mailbox/asynch event interrupt.*/
 653         if (intr_status & HSRX_RISC_MB_INT)
 654                 qla4xxx_isr_decode_mailbox(ha,
 655                     readl(&ha->qla4_8xxx_reg->mailbox_out[0]));
 656
 657         /* clear the interrupt */
 658         writel(0, &ha->qla4_8xxx_reg->host_int);
 659         readl(&ha->qla4_8xxx_reg->host_int);
 660 }
 661
 662 /**
 663  * qla4xxx_interrupt_service_routine - isr
 664  * @ha: pointer to host adapter structure.
 665  *
 666  * This is the main interrupt service routine.
 667  * hardware_lock locked upon entry. runs in interrupt context.
 668  **/
 669 void qla4xxx_interrupt_service_routine(struct scsi_qla_host * ha,
 670                                        uint32_t intr_status)
 671 {
 672         /* Process response queue interrupt. */
 673         if (intr_status & CSR_SCSI_COMPLETION_INTR)
 674                 qla4xxx_process_response_queue(ha);
 675
 676         /* Process mailbox/asynch event  interrupt.*/
 677         if (intr_status & CSR_SCSI_PROCESSOR_INTR) {
 678                 qla4xxx_isr_decode_mailbox(ha,
 679                                            readl(&ha->reg->mailbox[0]));
 680
 681                 /* Clear Mailbox Interrupt */
 682                 writel(set_rmask(CSR_SCSI_PROCESSOR_INTR),
 683                        &ha->reg->ctrl_status);
 684                 readl(&ha->reg->ctrl_status);
 685         }
 686 }
 687
 688 /**
 689  * qla4_8xxx_spurious_interrupt - processes spurious interrupt
 690  * @ha: pointer to host adapter structure.
 691  * @reqs_count: .
 692  *
 693  **/
 694 static void qla4_8xxx_spurious_interrupt(struct scsi_qla_host *ha,
 695     uint8_t reqs_count)
 696 {
 697         if (reqs_count)
 698                 return;
 699
 700         DEBUG2(ql4_printk(KERN_INFO, ha, "Spurious Interrupt\n"));
 701         if (is_qla8022(ha)) {
 702                 writel(0, &ha->qla4_8xxx_reg->host_int);
 703                 if (test_bit(AF_INTx_ENABLED, &ha->flags))
 704                         qla4_8xxx_wr_32(ha, ha->nx_legacy_intr.tgt_mask_reg,
 705                             0xfbff);
 706         }
 707         ha->spurious_int_count++;
 708 }
 709
 710 /**
 711  * qla4xxx_intr_handler - hardware interrupt handler.
 712  * @irq: Unused
 713  * @dev_id: Pointer to host adapter structure
 714  **/
 715 irqreturn_t qla4xxx_intr_handler(int irq, void *dev_id)
 716 {
 717         struct scsi_qla_host *ha;
 718         uint32_t intr_status;
 719         unsigned long flags = 0;
 720         uint8_t reqs_count = 0;
 721
 722         ha = (struct scsi_qla_host *) dev_id;
 723         if (!ha) {
 724                 DEBUG2(printk(KERN_INFO
 725                               "qla4xxx: Interrupt with NULL host ptr\n"));
 726                 return IRQ_NONE;
 727         }
 728
 729         spin_lock_irqsave(&ha->hardware_lock, flags);
 730
 731         ha->isr_count++;
 732         /*
 733          * Repeatedly service interrupts up to a maximum of
 734          * MAX_REQS_SERVICED_PER_INTR
 735          */
 736         while (1) {
 737                 /*
 738                  * Read interrupt status
 739                  */
 740                 if (ha->isp_ops->rd_shdw_rsp_q_in(ha) !=
 741                     ha->response_out)
 742                         intr_status = CSR_SCSI_COMPLETION_INTR;
 743                 else
 744                         intr_status = readl(&ha->reg->ctrl_status);
 745
 746                 if ((intr_status &
 747                     (CSR_SCSI_RESET_INTR|CSR_FATAL_ERROR|INTR_PENDING)) == 0) {
 748                         if (reqs_count == 0)
 749                                 ha->spurious_int_count++;
 750                         break;
 751                 }
 752
 753                 if (intr_status & CSR_FATAL_ERROR) {
 754                         DEBUG2(printk(KERN_INFO "scsi%ld: Fatal Error, "
 755                                       "Status 0x%04x\n", ha->host_no,
 756                                       readl(isp_port_error_status (ha))));
 757
 758                         /* Issue Soft Reset to clear this error condition.
 759                          * This will prevent the RISC from repeatedly
 760                          * interrupting the driver; thus, allowing the DPC to
 761                          * get scheduled to continue error recovery.
 762                          * NOTE: Disabling RISC interrupts does not work in
 763                          * this case, as CSR_FATAL_ERROR overrides
 764                          * CSR_SCSI_INTR_ENABLE */
 765                         if ((readl(&ha->reg->ctrl_status) &
 766                              CSR_SCSI_RESET_INTR) == 0) {
 767                                 writel(set_rmask(CSR_SOFT_RESET),
 768                                        &ha->reg->ctrl_status);
 769                                 readl(&ha->reg->ctrl_status);
 770                         }
 771
 772                         writel(set_rmask(CSR_FATAL_ERROR),
 773                                &ha->reg->ctrl_status);
 774                         readl(&ha->reg->ctrl_status);
 775
 776                         __qla4xxx_disable_intrs(ha);
 777
 778                         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 779
 780                         break;
 781                 } else if (intr_status & CSR_SCSI_RESET_INTR) {
 782                         clear_bit(AF_ONLINE, &ha->flags);
 783                         __qla4xxx_disable_intrs(ha);
 784
 785                         writel(set_rmask(CSR_SCSI_RESET_INTR),
 786                                &ha->reg->ctrl_status);
 787                         readl(&ha->reg->ctrl_status);
 788
 789                         if (!test_bit(AF_HBA_GOING_AWAY, &ha->flags))
 790                                 set_bit(DPC_RESET_HA_INTR, &ha->dpc_flags);
 791
 792                         break;
 793                 } else if (intr_status & INTR_PENDING) {
 794                         ha->isp_ops->interrupt_service_routine(ha, intr_status);
 795                         ha->total_io_count++;
 796                         if (++reqs_count == MAX_REQS_SERVICED_PER_INTR)
 797                                 break;
 798                 }
 799         }
 800
 801         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 802
 803         return IRQ_HANDLED;
 804 }
 805
 806 /**
 807  * qla4_8xxx_intr_handler - hardware interrupt handler.
 808  * @irq: Unused
 809  * @dev_id: Pointer to host adapter structure
 810  **/
 811 irqreturn_t qla4_8xxx_intr_handler(int irq, void *dev_id)
 812 {
 813         struct scsi_qla_host *ha = dev_id;
 814         uint32_t intr_status;
 815         uint32_t status;
 816         unsigned long flags = 0;
 817         uint8_t reqs_count = 0;
 818
 819         if (unlikely(pci_channel_offline(ha->pdev)))
 820                 return IRQ_HANDLED;
 821
 822         ha->isr_count++;
 823         status = qla4_8xxx_rd_32(ha, ISR_INT_VECTOR);
 824         if (!(status & ha->nx_legacy_intr.int_vec_bit))
 825                 return IRQ_NONE;
 826
 827         status = qla4_8xxx_rd_32(ha, ISR_INT_STATE_REG);
 828         if (!ISR_IS_LEGACY_INTR_TRIGGERED(status)) {
 829                 DEBUG2(ql4_printk(KERN_INFO, ha,
 830                     "%s legacy Int not triggered\n", __func__));
 831                 return IRQ_NONE;
 832         }
 833
 834         /* clear the interrupt */
 835         qla4_8xxx_wr_32(ha, ha->nx_legacy_intr.tgt_status_reg, 0xffffffff);
 836
 837         /* read twice to ensure write is flushed */
 838         qla4_8xxx_rd_32(ha, ISR_INT_VECTOR);
 839         qla4_8xxx_rd_32(ha, ISR_INT_VECTOR);
 840
 841         spin_lock_irqsave(&ha->hardware_lock, flags);
 842         while (1) {
 843                 if (!(readl(&ha->qla4_8xxx_reg->host_int) &
 844                     ISRX_82XX_RISC_INT)) {
 845                         qla4_8xxx_spurious_interrupt(ha, reqs_count);
 846                         break;
 847                 }
 848                 intr_status =  readl(&ha->qla4_8xxx_reg->host_status);
 849                 if ((intr_status &
 850                     (HSRX_RISC_MB_INT | HSRX_RISC_IOCB_INT)) == 0)  {
 851                         qla4_8xxx_spurious_interrupt(ha, reqs_count);
 852                         break;
 853                 }
 854
 855                 ha->isp_ops->interrupt_service_routine(ha, intr_status);
 856
 857                 /* Enable Interrupt */
 858                 qla4_8xxx_wr_32(ha, ha->nx_legacy_intr.tgt_mask_reg, 0xfbff);
 859
 860                 if (++reqs_count == MAX_REQS_SERVICED_PER_INTR)
 861                         break;
 862         }
 863
 864         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 865         return IRQ_HANDLED;
 866 }
 867
 868 irqreturn_t
 869 qla4_8xxx_msi_handler(int irq, void *dev_id)
 870 {
 871         struct scsi_qla_host *ha;
 872
 873         ha = (struct scsi_qla_host *) dev_id;
 874         if (!ha) {
 875                 DEBUG2(printk(KERN_INFO
 876                     "qla4xxx: MSIX: Interrupt with NULL host ptr\n"));
 877                 return IRQ_NONE;
 878         }
 879
 880         ha->isr_count++;
 881         /* clear the interrupt */
 882         qla4_8xxx_wr_32(ha, ha->nx_legacy_intr.tgt_status_reg, 0xffffffff);
 883
 884         /* read twice to ensure write is flushed */
 885         qla4_8xxx_rd_32(ha, ISR_INT_VECTOR);
 886         qla4_8xxx_rd_32(ha, ISR_INT_VECTOR);
 887
 888         return qla4_8xxx_default_intr_handler(irq, dev_id);
 889 }
 890
 891 /**
 892  * qla4_8xxx_default_intr_handler - hardware interrupt handler.
 893  * @irq: Unused
 894  * @dev_id: Pointer to host adapter structure
 895  *
 896  * This interrupt handler is called directly for MSI-X, and
 897  * called indirectly for MSI.
 898  **/
 899 irqreturn_t
 900 qla4_8xxx_default_intr_handler(int irq, void *dev_id)
 901 {
 902         struct scsi_qla_host *ha = dev_id;
 903         unsigned long   flags;
 904         uint32_t intr_status;
 905         uint8_t reqs_count = 0;
 906
 907         spin_lock_irqsave(&ha->hardware_lock, flags);
 908         while (1) {
 909                 if (!(readl(&ha->qla4_8xxx_reg->host_int) &
 910                     ISRX_82XX_RISC_INT)) {
 911                         qla4_8xxx_spurious_interrupt(ha, reqs_count);
 912                         break;
 913                 }
 914
 915                 intr_status =  readl(&ha->qla4_8xxx_reg->host_status);
 916                 if ((intr_status &
 917                     (HSRX_RISC_MB_INT | HSRX_RISC_IOCB_INT)) == 0) {
 918                         qla4_8xxx_spurious_interrupt(ha, reqs_count);
 919                         break;
 920                 }
 921
 922                 ha->isp_ops->interrupt_service_routine(ha, intr_status);
 923
 924                 if (++reqs_count == MAX_REQS_SERVICED_PER_INTR)
 925                         break;
 926         }
 927
 928         ha->isr_count++;
 929         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 930         return IRQ_HANDLED;
 931 }
 932
 933 irqreturn_t
 934 qla4_8xxx_msix_rsp_q(int irq, void *dev_id)
 935 {
 936         struct scsi_qla_host *ha = dev_id;
 937         unsigned long flags;
 938
 939         spin_lock_irqsave(&ha->hardware_lock, flags);
 940         qla4xxx_process_response_queue(ha);
 941         writel(0, &ha->qla4_8xxx_reg->host_int);
 942         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 943
 944         ha->isr_count++;
 945         return IRQ_HANDLED;
 946 }
 947
 948 /**
 949  * qla4xxx_process_aen - processes AENs generated by firmware
 950  * @ha: pointer to host adapter structure.
 951  * @process_aen: type of AENs to process
 952  *
 953  * Processes specific types of Asynchronous Events generated by firmware.
 954  * The type of AENs to process is specified by process_aen and can be
 955  *      PROCESS_ALL_AENS         0
 956  *      FLUSH_DDB_CHANGED_AENS   1
 957  *      RELOGIN_DDB_CHANGED_AENS 2
 958  **/
 959 void qla4xxx_process_aen(struct scsi_qla_host * ha, uint8_t process_aen)
 960 {
 961         uint32_t mbox_sts[MBOX_AEN_REG_COUNT];
 962         struct aen *aen;
 963         int i;
 964         unsigned long flags;
 965
 966         spin_lock_irqsave(&ha->hardware_lock, flags);
 967         while (ha->aen_out != ha->aen_in) {
 968                 aen = &ha->aen_q[ha->aen_out];
 969                 /* copy aen information to local structure */
 970                 for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
 971                         mbox_sts[i] = aen->mbox_sts[i];
 972
 973                 ha->aen_q_count++;
 974                 ha->aen_out++;
 975
 976                 if (ha->aen_out == MAX_AEN_ENTRIES)
 977                         ha->aen_out = 0;
 978
 979                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 980
 981                 DEBUG2(printk("qla4xxx(%ld): AEN[%d]=0x%08x, mbx1=0x%08x mbx2=0x%08x"
 982                         " mbx3=0x%08x mbx4=0x%08x\n", ha->host_no,
 983                         (ha->aen_out ? (ha->aen_out-1): (MAX_AEN_ENTRIES-1)),
 984                         mbox_sts[0], mbox_sts[1], mbox_sts[2],
 985                         mbox_sts[3], mbox_sts[4]));
 986
 987                 switch (mbox_sts[0]) {
 988                 case MBOX_ASTS_DATABASE_CHANGED:
 989                         if (process_aen == FLUSH_DDB_CHANGED_AENS) {
 990                                 DEBUG2(printk("scsi%ld: AEN[%d] %04x, index "
 991                                               "[%d] state=%04x FLUSHED!\n",
 992                                               ha->host_no, ha->aen_out,
 993                                               mbox_sts[0], mbox_sts[2],
 994                                               mbox_sts[3]));
 995                                 break;
 996                         } else if (process_aen == RELOGIN_DDB_CHANGED_AENS) {
 997                                 /* for use during init time, we only want to
 998                                  * relogin non-active ddbs */
 999                                 struct ddb_entry *ddb_entry;
1000
1001                                 ddb_entry =
1002                                         /* FIXME: name length? */
1003                                         qla4xxx_lookup_ddb_by_fw_index(ha,
1004                                                                        mbox_sts[2]);
1005                                 if (!ddb_entry)
1006                                         break;
1007
1008                                 ddb_entry->dev_scan_wait_to_complete_relogin =
1009                                         0;
1010                                 ddb_entry->dev_scan_wait_to_start_relogin =
1011                                         jiffies +
1012                                         ((ddb_entry->default_time2wait +
1013                                           4) * HZ);
1014
1015                                 DEBUG2(printk("scsi%ld: ddb [%d] initate"
1016                                               " RELOGIN after %d seconds\n",
1017                                               ha->host_no,
1018                                               ddb_entry->fw_ddb_index,
1019                                               ddb_entry->default_time2wait +
1020                                               4));
1021                                 break;
1022                         }
1023
1024                         if (mbox_sts[1] == 0) { /* Global DB change. */
1025                                 qla4xxx_reinitialize_ddb_list(ha);
1026                         } else if (mbox_sts[1] == 1) {  /* Specific device. */
1027                                 qla4xxx_process_ddb_changed(ha, mbox_sts[2],
1028                                                 mbox_sts[3], mbox_sts[4]);
1029                         }
1030                         break;
1031                 }
1032                 spin_lock_irqsave(&ha->hardware_lock, flags);
1033         }
1034         spin_unlock_irqrestore(&ha->hardware_lock, flags);
1035 }
1036
1037 int qla4xxx_request_irqs(struct scsi_qla_host *ha)
1038 {
1039         int ret;
1040
1041         if (!is_qla8022(ha))
1042                 goto try_intx;
1043
1044         if (ql4xenablemsix == 2)
1045                 goto try_msi;
1046
1047         if (ql4xenablemsix == 0 || ql4xenablemsix != 1)
1048                 goto try_intx;
1049
1050         /* Trying MSI-X */
1051         ret = qla4_8xxx_enable_msix(ha);
1052         if (!ret) {
1053                 DEBUG2(ql4_printk(KERN_INFO, ha,
1054                     "MSI-X: Enabled (0x%X).\n", ha->revision_id));
1055                 goto irq_attached;
1056         }
1057
1058         ql4_printk(KERN_WARNING, ha,
1059             "MSI-X: Falling back-to MSI mode -- %d.\n", ret);
1060
1061 try_msi:
1062         /* Trying MSI */
1063         ret = pci_enable_msi(ha->pdev);
1064         if (!ret) {
1065                 ret = request_irq(ha->pdev->irq, qla4_8xxx_msi_handler,
1066                         IRQF_DISABLED|IRQF_SHARED, DRIVER_NAME, ha);
1067                 if (!ret) {
1068                         DEBUG2(ql4_printk(KERN_INFO, ha, "MSI: Enabled.\n"));
1069                         set_bit(AF_MSI_ENABLED, &ha->flags);
1070                         goto irq_attached;
1071                 } else {
1072                         ql4_printk(KERN_WARNING, ha,
1073                             "MSI: Failed to reserve interrupt %d "
1074                             "already in use.\n", ha->pdev->irq);
1075                         pci_disable_msi(ha->pdev);
1076                 }
1077         }
1078         ql4_printk(KERN_WARNING, ha,
1079             "MSI: Falling back-to INTx mode -- %d.\n", ret);
1080
1081 try_intx:
1082         /* Trying INTx */
1083         ret = request_irq(ha->pdev->irq, ha->isp_ops->intr_handler,
1084             IRQF_DISABLED|IRQF_SHARED, DRIVER_NAME, ha);
1085         if (!ret) {
1086                 DEBUG2(ql4_printk(KERN_INFO, ha, "INTx: Enabled.\n"));
1087                 set_bit(AF_INTx_ENABLED, &ha->flags);
1088                 goto irq_attached;
1089
1090         } else {
1091                 ql4_printk(KERN_WARNING, ha,
1092                     "INTx: Failed to reserve interrupt %d already in"
1093                     " use.\n", ha->pdev->irq);
1094                 return ret;
1095         }
1096
1097 irq_attached:
1098         set_bit(AF_IRQ_ATTACHED, &ha->flags);
1099         ha->host->irq = ha->pdev->irq;
1100         ql4_printk(KERN_INFO, ha, "%s: irq %d attached\n",
1101             __func__, ha->pdev->irq);
1102         return ret;
1103 }
1104
1105 void qla4xxx_free_irqs(struct scsi_qla_host *ha)
1106 {
1107         if (test_bit(AF_MSIX_ENABLED, &ha->flags))
1108                 qla4_8xxx_disable_msix(ha);
1109         else if (test_and_clear_bit(AF_MSI_ENABLED, &ha->flags)) {
1110                 free_irq(ha->pdev->irq, ha);
1111                 pci_disable_msi(ha->pdev);
1112         } else if (test_and_clear_bit(AF_INTx_ENABLED, &ha->flags))
1113                 free_irq(ha->pdev->irq, ha);
1114 }