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                 /* FIXMEdg: Don't we need to reset ISP in this case??? */
 122                 DEBUG2(printk(KERN_WARNING "scsi%ld: %s: Status Entry invalid "
 123                               "handle 0x%x, sp=%p. This cmd may have already "
 124                               "been completed.\n", ha->host_no, __func__,
 125                               le32_to_cpu(sts_entry->handle), srb));
 126                 dev_warn(&ha->pdev->dev, "%s invalid status entry:"
 127                         " handle=0x%0x\n", __func__, sts_entry->handle);
 128                 set_bit(DPC_RESET_HA, &ha->dpc_flags);
 129                 return;
 130         }
 131
 132         cmd = srb->cmd;
 133         if (cmd == NULL) {
 134                 DEBUG2(printk("scsi%ld: %s: Command already returned back to "
 135                               "OS pkt->handle=%d srb=%p srb->state:%d\n",
 136                               ha->host_no, __func__, sts_entry->handle,
 137                               srb, srb->state));
 138                 dev_warn(&ha->pdev->dev, "Command is NULL:"
 139                         " already returned to OS (srb=%p)\n", srb);
 140                 return;
 141         }
 142
 143         ddb_entry = srb->ddb;
 144         if (ddb_entry == NULL) {
 145                 cmd->result = DID_NO_CONNECT << 16;
 146                 goto status_entry_exit;
 147         }
 148
 149         residual = le32_to_cpu(sts_entry->residualByteCnt);
 150
 151         /* Translate ISP error to a Linux SCSI error. */
 152         scsi_status = sts_entry->scsiStatus;
 153         switch (sts_entry->completionStatus) {
 154         case SCS_COMPLETE:
 155
 156                 if (sts_entry->iscsiFlags & ISCSI_FLAG_RESIDUAL_OVER) {
 157                         cmd->result = DID_ERROR << 16;
 158                         break;
 159                 }
 160
 161                 if (sts_entry->iscsiFlags &ISCSI_FLAG_RESIDUAL_UNDER) {
 162                         scsi_set_resid(cmd, residual);
 163                         if (!scsi_status && ((scsi_bufflen(cmd) - residual) <
 164                                 cmd->underflow)) {
 165
 166                                 cmd->result = DID_ERROR << 16;
 167
 168                                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: "
 169                                         "Mid-layer Data underrun0, "
 170                                         "xferlen = 0x%x, "
 171                                         "residual = 0x%x\n", ha->host_no,
 172                                         cmd->device->channel,
 173                                         cmd->device->id,
 174                                         cmd->device->lun, __func__,
 175                                         scsi_bufflen(cmd), residual));
 176                                 break;
 177                         }
 178                 }
 179
 180                 cmd->result = DID_OK << 16 | scsi_status;
 181
 182                 if (scsi_status != SCSI_CHECK_CONDITION)
 183                         break;
 184
 185                 /* Copy Sense Data into sense buffer. */
 186                 qla4xxx_copy_sense(ha, sts_entry, srb);
 187                 break;
 188
 189         case SCS_INCOMPLETE:
 190                 /* Always set the status to DID_ERROR, since
 191                  * all conditions result in that status anyway */
 192                 cmd->result = DID_ERROR << 16;
 193                 break;
 194
 195         case SCS_RESET_OCCURRED:
 196                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: Device RESET occurred\n",
 197                               ha->host_no, cmd->device->channel,
 198                               cmd->device->id, cmd->device->lun, __func__));
 199
 200                 cmd->result = DID_RESET << 16;
 201                 break;
 202
 203         case SCS_ABORTED:
 204                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: Abort occurred\n",
 205                               ha->host_no, cmd->device->channel,
 206                               cmd->device->id, cmd->device->lun, __func__));
 207
 208                 cmd->result = DID_RESET << 16;
 209                 break;
 210
 211         case SCS_TIMEOUT:
 212                 DEBUG2(printk(KERN_INFO "scsi%ld:%d:%d:%d: Timeout\n",
 213                               ha->host_no, cmd->device->channel,
 214                               cmd->device->id, cmd->device->lun));
 215
 216                 cmd->result = DID_TRANSPORT_DISRUPTED << 16;
 217
 218                 /*
 219                  * Mark device missing so that we won't continue to send
 220                  * I/O to this device.  We should get a ddb state change
 221                  * AEN soon.
 222                  */
 223                 if (atomic_read(&ddb_entry->state) == DDB_STATE_ONLINE)
 224                         qla4xxx_mark_device_missing(ha, ddb_entry);
 225                 break;
 226
 227         case SCS_DATA_UNDERRUN:
 228         case SCS_DATA_OVERRUN:
 229                 if ((sts_entry->iscsiFlags & ISCSI_FLAG_RESIDUAL_OVER) ||
 230                      (sts_entry->completionStatus == SCS_DATA_OVERRUN)) {
 231                         DEBUG2(printk("scsi%ld:%d:%d:%d: %s: " "Data overrun\n",
 232                                       ha->host_no,
 233                                       cmd->device->channel, cmd->device->id,
 234                                       cmd->device->lun, __func__));
 235
 236                         cmd->result = DID_ERROR << 16;
 237                         break;
 238                 }
 239
 240                 scsi_set_resid(cmd, residual);
 241
 242                 /*
 243                  * If there is scsi_status, it takes precedense over
 244                  * underflow condition.
 245                  */
 246                 if (scsi_status != 0) {
 247                         cmd->result = DID_OK << 16 | scsi_status;
 248
 249                         if (scsi_status != SCSI_CHECK_CONDITION)
 250                                 break;
 251
 252                         /* Copy Sense Data into sense buffer. */
 253                         qla4xxx_copy_sense(ha, sts_entry, srb);
 254                 } else {
 255                         /*
 256                          * If RISC reports underrun and target does not
 257                          * report it then we must have a lost frame, so
 258                          * tell upper layer to retry it by reporting a
 259                          * bus busy.
 260                          */
 261                         if ((sts_entry->iscsiFlags &
 262                              ISCSI_FLAG_RESIDUAL_UNDER) == 0) {
 263                                 cmd->result = DID_BUS_BUSY << 16;
 264                         } else if ((scsi_bufflen(cmd) - residual) <
 265                                    cmd->underflow) {
 266                                 /*
 267                                  * Handle mid-layer underflow???
 268                                  *
 269                                  * For kernels less than 2.4, the driver must
 270                                  * return an error if an underflow is detected.
 271                                  * For kernels equal-to and above 2.4, the
 272                                  * mid-layer will appearantly handle the
 273                                  * underflow by detecting the residual count --
 274                                  * unfortunately, we do not see where this is
 275                                  * actually being done.  In the interim, we
 276                                  * will return DID_ERROR.
 277                                  */
 278                                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: "
 279                                         "Mid-layer Data underrun1, "
 280                                         "xferlen = 0x%x, "
 281                                         "residual = 0x%x\n", ha->host_no,
 282                                         cmd->device->channel,
 283                                         cmd->device->id,
 284                                         cmd->device->lun, __func__,
 285                                         scsi_bufflen(cmd), residual));
 286
 287                                 cmd->result = DID_ERROR << 16;
 288                         } else {
 289                                 cmd->result = DID_OK << 16;
 290                         }
 291                 }
 292                 break;
 293
 294         case SCS_DEVICE_LOGGED_OUT:
 295         case SCS_DEVICE_UNAVAILABLE:
 296                 /*
 297                  * Mark device missing so that we won't continue to
 298                  * send I/O to this device.  We should get a ddb
 299                  * state change AEN soon.
 300                  */
 301                 if (atomic_read(&ddb_entry->state) == DDB_STATE_ONLINE)
 302                         qla4xxx_mark_device_missing(ha, ddb_entry);
 303
 304                 cmd->result = DID_TRANSPORT_DISRUPTED << 16;
 305                 break;
 306
 307         case SCS_QUEUE_FULL:
 308                 /*
 309                  * SCSI Mid-Layer handles device queue full
 310                  */
 311                 cmd->result = DID_OK << 16 | sts_entry->scsiStatus;
 312                 DEBUG2(printk("scsi%ld:%d:%d: %s: QUEUE FULL detected "
 313                               "compl=%02x, scsi=%02x, state=%02x, iFlags=%02x,"
 314                               " iResp=%02x\n", ha->host_no, cmd->device->id,
 315                               cmd->device->lun, __func__,
 316                               sts_entry->completionStatus,
 317                               sts_entry->scsiStatus, sts_entry->state_flags,
 318                               sts_entry->iscsiFlags,
 319                               sts_entry->iscsiResponse));
 320                 break;
 321
 322         default:
 323                 cmd->result = DID_ERROR << 16;
 324                 break;
 325         }
 326
 327 status_entry_exit:
 328
 329         /* complete the request, if not waiting for status_continuation pkt */
 330         srb->cc_stat = sts_entry->completionStatus;
 331         if (ha->status_srb == NULL)
 332                 kref_put(&srb->srb_ref, qla4xxx_srb_compl);
 333 }
 334
 335 /**
 336  * qla4xxx_process_response_queue - process response queue completions
 337  * @ha: Pointer to host adapter structure.
 338  *
 339  * This routine process response queue completions in interrupt context.
 340  * Hardware_lock locked upon entry
 341  **/
 342 static void qla4xxx_process_response_queue(struct scsi_qla_host * ha)
 343 {
 344         uint32_t count = 0;
 345         struct srb *srb = NULL;
 346         struct status_entry *sts_entry;
 347
 348         /* Process all responses from response queue */
 349         while ((ha->response_in =
 350                 (uint16_t)le32_to_cpu(ha->shadow_regs->rsp_q_in)) !=
 351                ha->response_out) {
 352                 sts_entry = (struct status_entry *) ha->response_ptr;
 353                 count++;
 354
 355                 /* Advance pointers for next entry */
 356                 if (ha->response_out == (RESPONSE_QUEUE_DEPTH - 1)) {
 357                         ha->response_out = 0;
 358                         ha->response_ptr = ha->response_ring;
 359                 } else {
 360                         ha->response_out++;
 361                         ha->response_ptr++;
 362                 }
 363
 364                 /* process entry */
 365                 switch (sts_entry->hdr.entryType) {
 366                 case ET_STATUS:
 367                         /* Common status */
 368                         qla4xxx_status_entry(ha, sts_entry);
 369                         break;
 370
 371                 case ET_PASSTHRU_STATUS:
 372                         break;
 373
 374                 case ET_STATUS_CONTINUATION:
 375                         qla4xxx_status_cont_entry(ha,
 376                                 (struct status_cont_entry *) sts_entry);
 377                         break;
 378
 379                 case ET_COMMAND:
 380                         /* ISP device queue is full. Command not
 381                          * accepted by ISP.  Queue command for
 382                          * later */
 383
 384                         srb = qla4xxx_del_from_active_array(ha,
 385                                                     le32_to_cpu(sts_entry->
 386                                                                 handle));
 387                         if (srb == NULL)
 388                                 goto exit_prq_invalid_handle;
 389
 390                         DEBUG2(printk("scsi%ld: %s: FW device queue full, "
 391                                       "srb %p\n", ha->host_no, __func__, srb));
 392
 393                         /* ETRY normally by sending it back with
 394                          * DID_BUS_BUSY */
 395                         srb->cmd->result = DID_BUS_BUSY << 16;
 396                         kref_put(&srb->srb_ref, qla4xxx_srb_compl);
 397                         break;
 398
 399                 case ET_CONTINUE:
 400                         /* Just throw away the continuation entries */
 401                         DEBUG2(printk("scsi%ld: %s: Continuation entry - "
 402                                       "ignoring\n", ha->host_no, __func__));
 403                         break;
 404
 405                 default:
 406                         /*
 407                          * Invalid entry in response queue, reset RISC
 408                          * firmware.
 409                          */
 410                         DEBUG2(printk("scsi%ld: %s: Invalid entry %x in "
 411                                       "response queue \n", ha->host_no,
 412                                       __func__,
 413                                       sts_entry->hdr.entryType));
 414                         goto exit_prq_error;
 415                 }
 416         }
 417
 418         /*
 419          * Done with responses, update the ISP For QLA4010, this also clears
 420          * the interrupt.
 421          */
 422         writel(ha->response_out, &ha->reg->rsp_q_out);
 423         readl(&ha->reg->rsp_q_out);
 424
 425         return;
 426
 427 exit_prq_invalid_handle:
 428         DEBUG2(printk("scsi%ld: %s: Invalid handle(srb)=%p type=%x IOCS=%x\n",
 429                       ha->host_no, __func__, srb, sts_entry->hdr.entryType,
 430                       sts_entry->completionStatus));
 431
 432 exit_prq_error:
 433         writel(ha->response_out, &ha->reg->rsp_q_out);
 434         readl(&ha->reg->rsp_q_out);
 435
 436         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 437 }
 438
 439 /**
 440  * qla4xxx_isr_decode_mailbox - decodes mailbox status
 441  * @ha: Pointer to host adapter structure.
 442  * @mailbox_status: Mailbox status.
 443  *
 444  * This routine decodes the mailbox status during the ISR.
 445  * Hardware_lock locked upon entry. runs in interrupt context.
 446  **/
 447 static void qla4xxx_isr_decode_mailbox(struct scsi_qla_host * ha,
 448                                        uint32_t mbox_status)
 449 {
 450         int i;
 451         uint32_t mbox_stat2, mbox_stat3;
 452
 453         if ((mbox_status == MBOX_STS_BUSY) ||
 454             (mbox_status == MBOX_STS_INTERMEDIATE_COMPLETION) ||
 455             (mbox_status >> 12 == MBOX_COMPLETION_STATUS)) {
 456                 ha->mbox_status[0] = mbox_status;
 457
 458                 if (test_bit(AF_MBOX_COMMAND, &ha->flags)) {
 459                         /*
 460                          * Copy all mailbox registers to a temporary
 461                          * location and set mailbox command done flag
 462                          */
 463                         for (i = 1; i < ha->mbox_status_count; i++)
 464                                 ha->mbox_status[i] =
 465                                         readl(&ha->reg->mailbox[i]);
 466
 467                         set_bit(AF_MBOX_COMMAND_DONE, &ha->flags);
 468                 }
 469         } else if (mbox_status >> 12 == MBOX_ASYNC_EVENT_STATUS) {
 470                 /* Immediately process the AENs that don't require much work.
 471                  * Only queue the database_changed AENs */
 472                 if (ha->aen_log.count < MAX_AEN_ENTRIES) {
 473                         for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
 474                                 ha->aen_log.entry[ha->aen_log.count].mbox_sts[i] =
 475                                         readl(&ha->reg->mailbox[i]);
 476                         ha->aen_log.count++;
 477                 }
 478                 switch (mbox_status) {
 479                 case MBOX_ASTS_SYSTEM_ERROR:
 480                         /* Log Mailbox registers */
 481                         if (ql4xdontresethba) {
 482                                 DEBUG2(printk("%s:Dont Reset HBA\n",
 483                                               __func__));
 484                         } else {
 485                                 set_bit(AF_GET_CRASH_RECORD, &ha->flags);
 486                                 set_bit(DPC_RESET_HA, &ha->dpc_flags);
 487                         }
 488                         break;
 489
 490                 case MBOX_ASTS_REQUEST_TRANSFER_ERROR:
 491                 case MBOX_ASTS_RESPONSE_TRANSFER_ERROR:
 492                 case MBOX_ASTS_NVRAM_INVALID:
 493                 case MBOX_ASTS_IP_ADDRESS_CHANGED:
 494                 case MBOX_ASTS_DHCP_LEASE_EXPIRED:
 495                         DEBUG2(printk("scsi%ld: AEN %04x, ERROR Status, "
 496                                       "Reset HA\n", ha->host_no, mbox_status));
 497                         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 498                         break;
 499
 500                 case MBOX_ASTS_LINK_UP:
 501                         set_bit(AF_LINK_UP, &ha->flags);
 502                         if (test_bit(AF_INIT_DONE, &ha->flags))
 503                                 set_bit(DPC_LINK_CHANGED, &ha->dpc_flags);
 504
 505                         DEBUG2(printk(KERN_INFO "scsi%ld: AEN %04x Adapter"
 506                                         " LINK UP\n", ha->host_no,
 507                                         mbox_status));
 508                         break;
 509
 510                 case MBOX_ASTS_LINK_DOWN:
 511                         clear_bit(AF_LINK_UP, &ha->flags);
 512                         set_bit(DPC_LINK_CHANGED, &ha->dpc_flags);
 513
 514                         DEBUG2(printk(KERN_INFO "scsi%ld: AEN %04x Adapter"
 515                                         " LINK DOWN\n", ha->host_no,
 516                                         mbox_status));
 517                         break;
 518
 519                 case MBOX_ASTS_HEARTBEAT:
 520                         ha->seconds_since_last_heartbeat = 0;
 521                         break;
 522
 523                 case MBOX_ASTS_DHCP_LEASE_ACQUIRED:
 524                         DEBUG2(printk("scsi%ld: AEN %04x DHCP LEASE "
 525                                       "ACQUIRED\n", ha->host_no, mbox_status));
 526                         set_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags);
 527                         break;
 528
 529                 case MBOX_ASTS_PROTOCOL_STATISTIC_ALARM:
 530                 case MBOX_ASTS_SCSI_COMMAND_PDU_REJECTED: /* Target
 531                                                            * mode
 532                                                            * only */
 533                 case MBOX_ASTS_UNSOLICITED_PDU_RECEIVED:  /* Connection mode */
 534                 case MBOX_ASTS_IPSEC_SYSTEM_FATAL_ERROR:
 535                 case MBOX_ASTS_SUBNET_STATE_CHANGE:
 536                         /* No action */
 537                         DEBUG2(printk("scsi%ld: AEN %04x\n", ha->host_no,
 538                                       mbox_status));
 539                         break;
 540
 541                 case MBOX_ASTS_IP_ADDR_STATE_CHANGED:
 542                         mbox_stat2 = readl(&ha->reg->mailbox[2]);
 543                         mbox_stat3 = readl(&ha->reg->mailbox[3]);
 544
 545                         if ((mbox_stat3 == 5) && (mbox_stat2 == 3))
 546                                 set_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags);
 547                         else if ((mbox_stat3 == 2) && (mbox_stat2 == 5))
 548                                 set_bit(DPC_RESET_HA, &ha->dpc_flags);
 549                         break;
 550
 551                 case MBOX_ASTS_MAC_ADDRESS_CHANGED:
 552                 case MBOX_ASTS_DNS:
 553                         /* No action */
 554                         DEBUG2(printk(KERN_INFO "scsi%ld: AEN %04x, "
 555                                       "mbox_sts[1]=%04x, mbox_sts[2]=%04x\n",
 556                                       ha->host_no, mbox_status,
 557                                       readl(&ha->reg->mailbox[1]),
 558                                       readl(&ha->reg->mailbox[2])));
 559                         break;
 560
 561                 case MBOX_ASTS_SELF_TEST_FAILED:
 562                 case MBOX_ASTS_LOGIN_FAILED:
 563                         /* No action */
 564                         DEBUG2(printk("scsi%ld: AEN %04x, mbox_sts[1]=%04x, "
 565                                       "mbox_sts[2]=%04x, mbox_sts[3]=%04x\n",
 566                                       ha->host_no, mbox_status,
 567                                       readl(&ha->reg->mailbox[1]),
 568                                       readl(&ha->reg->mailbox[2]),
 569                                       readl(&ha->reg->mailbox[3])));
 570                         break;
 571
 572                 case MBOX_ASTS_DATABASE_CHANGED:
 573                         /* Queue AEN information and process it in the DPC
 574                          * routine */
 575                         if (ha->aen_q_count > 0) {
 576
 577                                 /* decrement available counter */
 578                                 ha->aen_q_count--;
 579
 580                                 for (i = 1; i < MBOX_AEN_REG_COUNT; i++)
 581                                         ha->aen_q[ha->aen_in].mbox_sts[i] =
 582                                                 readl(&ha->reg->mailbox[i]);
 583
 584                                 ha->aen_q[ha->aen_in].mbox_sts[0] = mbox_status;
 585
 586                                 /* print debug message */
 587                                 DEBUG2(printk("scsi%ld: AEN[%d] %04x queued"
 588                                               " mb1:0x%x mb2:0x%x mb3:0x%x mb4:0x%x\n",
 589                                               ha->host_no, ha->aen_in,
 590                                               mbox_status,
 591                                               ha->aen_q[ha->aen_in].mbox_sts[1],
 592                                               ha->aen_q[ha->aen_in].mbox_sts[2],
 593                                               ha->aen_q[ha->aen_in].mbox_sts[3],
 594                                               ha->aen_q[ha->aen_in].  mbox_sts[4]));
 595                                 /* advance pointer */
 596                                 ha->aen_in++;
 597                                 if (ha->aen_in == MAX_AEN_ENTRIES)
 598                                         ha->aen_in = 0;
 599
 600                                 /* The DPC routine will process the aen */
 601                                 set_bit(DPC_AEN, &ha->dpc_flags);
 602                         } else {
 603                                 DEBUG2(printk("scsi%ld: %s: aen %04x, queue "
 604                                               "overflowed!  AEN LOST!!\n",
 605                                               ha->host_no, __func__,
 606                                               mbox_status));
 607
 608                                 DEBUG2(printk("scsi%ld: DUMP AEN QUEUE\n",
 609                                               ha->host_no));
 610
 611                                 for (i = 0; i < MAX_AEN_ENTRIES; i++) {
 612                                         DEBUG2(printk("AEN[%d] %04x %04x %04x "
 613                                                       "%04x\n", i,
 614                                                       ha->aen_q[i].mbox_sts[0],
 615                                                       ha->aen_q[i].mbox_sts[1],
 616                                                       ha->aen_q[i].mbox_sts[2],
 617                                                       ha->aen_q[i].mbox_sts[3]));
 618                                 }
 619                         }
 620                         break;
 621
 622                 default:
 623                         DEBUG2(printk(KERN_WARNING
 624                                       "scsi%ld: AEN %04x UNKNOWN\n",
 625                                       ha->host_no, mbox_status));
 626                         break;
 627                 }
 628         } else {
 629                 DEBUG2(printk("scsi%ld: Unknown mailbox status %08X\n",
 630                               ha->host_no, mbox_status));
 631
 632                 ha->mbox_status[0] = mbox_status;
 633         }
 634 }
 635
 636 /**
 637  * qla4xxx_interrupt_service_routine - isr
 638  * @ha: pointer to host adapter structure.
 639  *
 640  * This is the main interrupt service routine.
 641  * hardware_lock locked upon entry. runs in interrupt context.
 642  **/
 643 void qla4xxx_interrupt_service_routine(struct scsi_qla_host * ha,
 644                                        uint32_t intr_status)
 645 {
 646         /* Process response queue interrupt. */
 647         if (intr_status & CSR_SCSI_COMPLETION_INTR)
 648                 qla4xxx_process_response_queue(ha);
 649
 650         /* Process mailbox/asynch event  interrupt.*/
 651         if (intr_status & CSR_SCSI_PROCESSOR_INTR) {
 652                 qla4xxx_isr_decode_mailbox(ha,
 653                                            readl(&ha->reg->mailbox[0]));
 654
 655                 /* Clear Mailbox Interrupt */
 656                 writel(set_rmask(CSR_SCSI_PROCESSOR_INTR),
 657                        &ha->reg->ctrl_status);
 658                 readl(&ha->reg->ctrl_status);
 659         }
 660 }
 661
 662 /**
 663  * qla4xxx_intr_handler - hardware interrupt handler.
 664  * @irq: Unused
 665  * @dev_id: Pointer to host adapter structure
 666  **/
 667 irqreturn_t qla4xxx_intr_handler(int irq, void *dev_id)
 668 {
 669         struct scsi_qla_host *ha;
 670         uint32_t intr_status;
 671         unsigned long flags = 0;
 672         uint8_t reqs_count = 0;
 673
 674         ha = (struct scsi_qla_host *) dev_id;
 675         if (!ha) {
 676                 DEBUG2(printk(KERN_INFO
 677                               "qla4xxx: Interrupt with NULL host ptr\n"));
 678                 return IRQ_NONE;
 679         }
 680
 681         spin_lock_irqsave(&ha->hardware_lock, flags);
 682
 683         ha->isr_count++;
 684         /*
 685          * Repeatedly service interrupts up to a maximum of
 686          * MAX_REQS_SERVICED_PER_INTR
 687          */
 688         while (1) {
 689                 /*
 690                  * Read interrupt status
 691                  */
 692                 if (le32_to_cpu(ha->shadow_regs->rsp_q_in) !=
 693                     ha->response_out)
 694                         intr_status = CSR_SCSI_COMPLETION_INTR;
 695                 else
 696                         intr_status = readl(&ha->reg->ctrl_status);
 697
 698                 if ((intr_status &
 699                      (CSR_SCSI_RESET_INTR|CSR_FATAL_ERROR|INTR_PENDING)) ==
 700                     0) {
 701                         if (reqs_count == 0)
 702                                 ha->spurious_int_count++;
 703                         break;
 704                 }
 705
 706                 if (intr_status & CSR_FATAL_ERROR) {
 707                         DEBUG2(printk(KERN_INFO "scsi%ld: Fatal Error, "
 708                                       "Status 0x%04x\n", ha->host_no,
 709                                       readl(isp_port_error_status (ha))));
 710
 711                         /* Issue Soft Reset to clear this error condition.
 712                          * This will prevent the RISC from repeatedly
 713                          * interrupting the driver; thus, allowing the DPC to
 714                          * get scheduled to continue error recovery.
 715                          * NOTE: Disabling RISC interrupts does not work in
 716                          * this case, as CSR_FATAL_ERROR overrides
 717                          * CSR_SCSI_INTR_ENABLE */
 718                         if ((readl(&ha->reg->ctrl_status) &
 719                              CSR_SCSI_RESET_INTR) == 0) {
 720                                 writel(set_rmask(CSR_SOFT_RESET),
 721                                        &ha->reg->ctrl_status);
 722                                 readl(&ha->reg->ctrl_status);
 723                         }
 724
 725                         writel(set_rmask(CSR_FATAL_ERROR),
 726                                &ha->reg->ctrl_status);
 727                         readl(&ha->reg->ctrl_status);
 728
 729                         __qla4xxx_disable_intrs(ha);
 730
 731                         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 732
 733                         break;
 734                 } else if (intr_status & CSR_SCSI_RESET_INTR) {
 735                         clear_bit(AF_ONLINE, &ha->flags);
 736                         __qla4xxx_disable_intrs(ha);
 737
 738                         writel(set_rmask(CSR_SCSI_RESET_INTR),
 739                                &ha->reg->ctrl_status);
 740                         readl(&ha->reg->ctrl_status);
 741
 742                         if (!ql4_mod_unload)
 743                                 set_bit(DPC_RESET_HA_INTR, &ha->dpc_flags);
 744
 745                         break;
 746                 } else if (intr_status & INTR_PENDING) {
 747                         qla4xxx_interrupt_service_routine(ha, intr_status);
 748                         ha->total_io_count++;
 749                         if (++reqs_count == MAX_REQS_SERVICED_PER_INTR)
 750                                 break;
 751
 752                         intr_status = 0;
 753                 }
 754         }
 755
 756         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 757
 758         return IRQ_HANDLED;
 759 }
 760
 761 /**
 762  * qla4xxx_process_aen - processes AENs generated by firmware
 763  * @ha: pointer to host adapter structure.
 764  * @process_aen: type of AENs to process
 765  *
 766  * Processes specific types of Asynchronous Events generated by firmware.
 767  * The type of AENs to process is specified by process_aen and can be
 768  *      PROCESS_ALL_AENS         0
 769  *      FLUSH_DDB_CHANGED_AENS   1
 770  *      RELOGIN_DDB_CHANGED_AENS 2
 771  **/
 772 void qla4xxx_process_aen(struct scsi_qla_host * ha, uint8_t process_aen)
 773 {
 774         uint32_t mbox_sts[MBOX_AEN_REG_COUNT];
 775         struct aen *aen;
 776         int i;
 777         unsigned long flags;
 778
 779         spin_lock_irqsave(&ha->hardware_lock, flags);
 780         while (ha->aen_out != ha->aen_in) {
 781                 aen = &ha->aen_q[ha->aen_out];
 782                 /* copy aen information to local structure */
 783                 for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
 784                         mbox_sts[i] = aen->mbox_sts[i];
 785
 786                 ha->aen_q_count++;
 787                 ha->aen_out++;
 788
 789                 if (ha->aen_out == MAX_AEN_ENTRIES)
 790                         ha->aen_out = 0;
 791
 792                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 793
 794                 DEBUG2(printk("qla4xxx(%ld): AEN[%d]=0x%08x, mbx1=0x%08x mbx2=0x%08x"
 795                         " mbx3=0x%08x mbx4=0x%08x\n", ha->host_no,
 796                         (ha->aen_out ? (ha->aen_out-1): (MAX_AEN_ENTRIES-1)),
 797                         mbox_sts[0], mbox_sts[1], mbox_sts[2],
 798                         mbox_sts[3], mbox_sts[4]));
 799
 800                 switch (mbox_sts[0]) {
 801                 case MBOX_ASTS_DATABASE_CHANGED:
 802                         if (process_aen == FLUSH_DDB_CHANGED_AENS) {
 803                                 DEBUG2(printk("scsi%ld: AEN[%d] %04x, index "
 804                                               "[%d] state=%04x FLUSHED!\n",
 805                                               ha->host_no, ha->aen_out,
 806                                               mbox_sts[0], mbox_sts[2],
 807                                               mbox_sts[3]));
 808                                 break;
 809                         } else if (process_aen == RELOGIN_DDB_CHANGED_AENS) {
 810                                 /* for use during init time, we only want to
 811                                  * relogin non-active ddbs */
 812                                 struct ddb_entry *ddb_entry;
 813
 814                                 ddb_entry =
 815                                         /* FIXME: name length? */
 816                                         qla4xxx_lookup_ddb_by_fw_index(ha,
 817                                                                        mbox_sts[2]);
 818                                 if (!ddb_entry)
 819                                         break;
 820
 821                                 ddb_entry->dev_scan_wait_to_complete_relogin =
 822                                         0;
 823                                 ddb_entry->dev_scan_wait_to_start_relogin =
 824                                         jiffies +
 825                                         ((ddb_entry->default_time2wait +
 826                                           4) * HZ);
 827
 828                                 DEBUG2(printk("scsi%ld: ddb index [%d] initate"
 829                                               " RELOGIN after %d seconds\n",
 830                                               ha->host_no,
 831                                               ddb_entry->fw_ddb_index,
 832                                               ddb_entry->default_time2wait +
 833                                               4));
 834                                 break;
 835                         }
 836
 837                         if (mbox_sts[1] == 0) { /* Global DB change. */
 838                                 qla4xxx_reinitialize_ddb_list(ha);
 839                         } else if (mbox_sts[1] == 1) {  /* Specific device. */
 840                                 qla4xxx_process_ddb_changed(ha, mbox_sts[2],
 841                                                 mbox_sts[3], mbox_sts[4]);
 842                         }
 843                         break;
 844                 }
 845                 spin_lock_irqsave(&ha->hardware_lock, flags);
 846         }
 847         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 848 }
 849