drivers/scsi/qla4xxx/ql4_isr.c

   1 /*
   2  * QLogic iSCSI HBA Driver
   3  * Copyright (c)  2003-2012 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                 DEBUG2(ql4_printk(KERN_INFO, ha, "scsi%ld:%d:%d:%d: %s:"
  30                                   " sense len 0\n", ha->host_no,
  31                                   cmd->device->channel, cmd->device->id,
  32                                   cmd->device->lun, __func__));
  33                 ha->status_srb = NULL;
  34                 return;
  35         }
  36         /* Save total available sense length,
  37          * not to exceed cmd's sense buffer size */
  38         sense_len = min_t(uint16_t, sense_len, SCSI_SENSE_BUFFERSIZE);
  39         srb->req_sense_ptr = cmd->sense_buffer;
  40         srb->req_sense_len = sense_len;
  41
  42         /* Copy sense from sts_entry pkt */
  43         sense_len = min_t(uint16_t, sense_len, IOCB_MAX_SENSEDATA_LEN);
  44         memcpy(cmd->sense_buffer, sts_entry->senseData, sense_len);
  45
  46         DEBUG2(printk(KERN_INFO "scsi%ld:%d:%d:%d: %s: sense key = %x, "
  47                 "ASL= %02x, ASC/ASCQ = %02x/%02x\n", ha->host_no,
  48                 cmd->device->channel, cmd->device->id,
  49                 cmd->device->lun, __func__,
  50                 sts_entry->senseData[2] & 0x0f,
  51                 sts_entry->senseData[7],
  52                 sts_entry->senseData[12],
  53                 sts_entry->senseData[13]));
  54
  55         DEBUG5(qla4xxx_dump_buffer(cmd->sense_buffer, sense_len));
  56         srb->flags |= SRB_GOT_SENSE;
  57
  58         /* Update srb, in case a sts_cont pkt follows */
  59         srb->req_sense_ptr += sense_len;
  60         srb->req_sense_len -= sense_len;
  61         if (srb->req_sense_len != 0)
  62                 ha->status_srb = srb;
  63         else
  64                 ha->status_srb = NULL;
  65 }
  66
  67 /**
  68  * qla4xxx_status_cont_entry - Process a Status Continuations entry.
  69  * @ha: SCSI driver HA context
  70  * @sts_cont: Entry pointer
  71  *
  72  * Extended sense data.
  73  */
  74 static void
  75 qla4xxx_status_cont_entry(struct scsi_qla_host *ha,
  76                           struct status_cont_entry *sts_cont)
  77 {
  78         struct srb *srb = ha->status_srb;
  79         struct scsi_cmnd *cmd;
  80         uint16_t sense_len;
  81
  82         if (srb == NULL)
  83                 return;
  84
  85         cmd = srb->cmd;
  86         if (cmd == NULL) {
  87                 DEBUG2(printk(KERN_INFO "scsi%ld: %s: Cmd already returned "
  88                         "back to OS srb=%p srb->state:%d\n", ha->host_no,
  89                         __func__, srb, srb->state));
  90                 ha->status_srb = NULL;
  91                 return;
  92         }
  93
  94         /* Copy sense data. */
  95         sense_len = min_t(uint16_t, srb->req_sense_len,
  96                           IOCB_MAX_EXT_SENSEDATA_LEN);
  97         memcpy(srb->req_sense_ptr, sts_cont->ext_sense_data, sense_len);
  98         DEBUG5(qla4xxx_dump_buffer(srb->req_sense_ptr, sense_len));
  99
 100         srb->req_sense_ptr += sense_len;
 101         srb->req_sense_len -= sense_len;
 102
 103         /* Place command on done queue. */
 104         if (srb->req_sense_len == 0) {
 105                 kref_put(&srb->srb_ref, qla4xxx_srb_compl);
 106                 ha->status_srb = NULL;
 107         }
 108 }
 109
 110 /**
 111  * qla4xxx_status_entry - processes status IOCBs
 112  * @ha: Pointer to host adapter structure.
 113  * @sts_entry: Pointer to status entry structure.
 114  **/
 115 static void qla4xxx_status_entry(struct scsi_qla_host *ha,
 116                                  struct status_entry *sts_entry)
 117 {
 118         uint8_t scsi_status;
 119         struct scsi_cmnd *cmd;
 120         struct srb *srb;
 121         struct ddb_entry *ddb_entry;
 122         uint32_t residual;
 123
 124         srb = qla4xxx_del_from_active_array(ha, le32_to_cpu(sts_entry->handle));
 125         if (!srb) {
 126                 ql4_printk(KERN_WARNING, ha, "%s invalid status entry: "
 127                            "handle=0x%0x, srb=%p\n", __func__,
 128                            sts_entry->handle, srb);
 129                 if (is_qla80XX(ha))
 130                         set_bit(DPC_RESET_HA_FW_CONTEXT, &ha->dpc_flags);
 131                 else
 132                         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 133                 return;
 134         }
 135
 136         cmd = srb->cmd;
 137         if (cmd == NULL) {
 138                 DEBUG2(printk("scsi%ld: %s: Command already returned back to "
 139                               "OS pkt->handle=%d srb=%p srb->state:%d\n",
 140                               ha->host_no, __func__, sts_entry->handle,
 141                               srb, srb->state));
 142                 ql4_printk(KERN_WARNING, ha, "Command is NULL:"
 143                     " already returned to OS (srb=%p)\n", srb);
 144                 return;
 145         }
 146
 147         ddb_entry = srb->ddb;
 148         if (ddb_entry == NULL) {
 149                 cmd->result = DID_NO_CONNECT << 16;
 150                 goto status_entry_exit;
 151         }
 152
 153         residual = le32_to_cpu(sts_entry->residualByteCnt);
 154
 155         /* Translate ISP error to a Linux SCSI error. */
 156         scsi_status = sts_entry->scsiStatus;
 157         switch (sts_entry->completionStatus) {
 158         case SCS_COMPLETE:
 159
 160                 if (sts_entry->iscsiFlags & ISCSI_FLAG_RESIDUAL_OVER) {
 161                         cmd->result = DID_ERROR << 16;
 162                         break;
 163                 }
 164
 165                 if (sts_entry->iscsiFlags &ISCSI_FLAG_RESIDUAL_UNDER) {
 166                         scsi_set_resid(cmd, residual);
 167                         if (!scsi_status && ((scsi_bufflen(cmd) - residual) <
 168                                 cmd->underflow)) {
 169
 170                                 cmd->result = DID_ERROR << 16;
 171
 172                                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: "
 173                                         "Mid-layer Data underrun0, "
 174                                         "xferlen = 0x%x, "
 175                                         "residual = 0x%x\n", ha->host_no,
 176                                         cmd->device->channel,
 177                                         cmd->device->id,
 178                                         cmd->device->lun, __func__,
 179                                         scsi_bufflen(cmd), residual));
 180                                 break;
 181                         }
 182                 }
 183
 184                 cmd->result = DID_OK << 16 | scsi_status;
 185
 186                 if (scsi_status != SCSI_CHECK_CONDITION)
 187                         break;
 188
 189                 /* Copy Sense Data into sense buffer. */
 190                 qla4xxx_copy_sense(ha, sts_entry, srb);
 191                 break;
 192
 193         case SCS_INCOMPLETE:
 194                 /* Always set the status to DID_ERROR, since
 195                  * all conditions result in that status anyway */
 196                 cmd->result = DID_ERROR << 16;
 197                 break;
 198
 199         case SCS_RESET_OCCURRED:
 200                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: Device RESET occurred\n",
 201                               ha->host_no, cmd->device->channel,
 202                               cmd->device->id, cmd->device->lun, __func__));
 203
 204                 cmd->result = DID_RESET << 16;
 205                 break;
 206
 207         case SCS_ABORTED:
 208                 DEBUG2(printk("scsi%ld:%d:%d:%d: %s: Abort occurred\n",
 209                               ha->host_no, cmd->device->channel,
 210                               cmd->device->id, cmd->device->lun, __func__));
 211
 212                 cmd->result = DID_RESET << 16;
 213                 break;
 214
 215         case SCS_TIMEOUT:
 216                 DEBUG2(printk(KERN_INFO "scsi%ld:%d:%d:%d: Timeout\n",
 217                               ha->host_no, cmd->device->channel,
 218                               cmd->device->id, cmd->device->lun));
 219
 220                 cmd->result = DID_TRANSPORT_DISRUPTED << 16;
 221
 222                 /*
 223                  * Mark device missing so that we won't continue to send
 224                  * I/O to this device.  We should get a ddb state change
 225                  * AEN soon.
 226                  */
 227                 if (iscsi_is_session_online(ddb_entry->sess))
 228                         qla4xxx_mark_device_missing(ddb_entry->sess);
 229                 break;
 230
 231         case SCS_DATA_UNDERRUN:
 232         case SCS_DATA_OVERRUN:
 233                 if ((sts_entry->iscsiFlags & ISCSI_FLAG_RESIDUAL_OVER) ||
 234                      (sts_entry->completionStatus == SCS_DATA_OVERRUN)) {
 235                         DEBUG2(printk("scsi%ld:%d:%d:%d: %s: " "Data overrun\n",
 236                                       ha->host_no,
 237                                       cmd->device->channel, cmd->device->id,
 238                                       cmd->device->lun, __func__));
 239
 240                         cmd->result = DID_ERROR << 16;
 241                         break;
 242                 }
 243
 244                 scsi_set_resid(cmd, residual);
 245
 246                 if (sts_entry->iscsiFlags & ISCSI_FLAG_RESIDUAL_UNDER) {
 247
 248                         /* Both the firmware and target reported UNDERRUN:
 249                          *
 250                          * MID-LAYER UNDERFLOW case:
 251                          * Some kernels do not properly detect midlayer
 252                          * underflow, so we manually check it and return
 253                          * ERROR if the minimum required data was not
 254                          * received.
 255                          *
 256                          * ALL OTHER cases:
 257                          * Fall thru to check scsi_status
 258                          */
 259                         if (!scsi_status && (scsi_bufflen(cmd) - residual) <
 260                             cmd->underflow) {
 261                                 DEBUG2(ql4_printk(KERN_INFO, ha,
 262                                                   "scsi%ld:%d:%d:%d: %s: Mid-layer Data underrun, xferlen = 0x%x,residual = 0x%x\n",
 263                                                    ha->host_no,
 264                                                    cmd->device->channel,
 265                                                    cmd->device->id,
 266                                                    cmd->device->lun, __func__,
 267                                                    scsi_bufflen(cmd),
 268                                                    residual));
 269
 270                                 cmd->result = DID_ERROR << 16;
 271                                 break;
 272                         }
 273
 274                 } else if (scsi_status != SAM_STAT_TASK_SET_FULL &&
 275                            scsi_status != SAM_STAT_BUSY) {
 276
 277                         /*
 278                          * The firmware reports UNDERRUN, but the target does
 279                          * not report it:
 280                          *
 281                          *   scsi_status     |    host_byte       device_byte
 282                          *                   |     (19:16)          (7:0)
 283                          *   =============   |    =========       ===========
 284                          *   TASK_SET_FULL   |    DID_OK          scsi_status
 285                          *   BUSY            |    DID_OK          scsi_status
 286                          *   ALL OTHERS      |    DID_ERROR       scsi_status
 287                          *
 288                          *   Note: If scsi_status is task set full or busy,
 289                          *   then this else if would fall thru to check the
 290                          *   scsi_status and return DID_OK.
 291                          */
 292
 293                         DEBUG2(ql4_printk(KERN_INFO, ha,
 294                                           "scsi%ld:%d:%d:%d: %s: Dropped frame(s) detected (0x%x of 0x%x bytes).\n",
 295                                           ha->host_no,
 296                                           cmd->device->channel,
 297                                           cmd->device->id,
 298                                           cmd->device->lun, __func__,
 299                                           residual,
 300                                           scsi_bufflen(cmd)));
 301
 302                         cmd->result = DID_ERROR << 16 | scsi_status;
 303                         goto check_scsi_status;
 304                 }
 305
 306                 cmd->result = DID_OK << 16 | scsi_status;
 307
 308 check_scsi_status:
 309                 if (scsi_status == SAM_STAT_CHECK_CONDITION)
 310                         qla4xxx_copy_sense(ha, sts_entry, srb);
 311
 312                 break;
 313
 314         case SCS_DEVICE_LOGGED_OUT:
 315         case SCS_DEVICE_UNAVAILABLE:
 316                 DEBUG2(printk(KERN_INFO "scsi%ld:%d:%d:%d: SCS_DEVICE "
 317                     "state: 0x%x\n", ha->host_no,
 318                     cmd->device->channel, cmd->device->id,
 319                     cmd->device->lun, sts_entry->completionStatus));
 320                 /*
 321                  * Mark device missing so that we won't continue to
 322                  * send I/O to this device.  We should get a ddb
 323                  * state change AEN soon.
 324                  */
 325                 if (iscsi_is_session_online(ddb_entry->sess))
 326                         qla4xxx_mark_device_missing(ddb_entry->sess);
 327
 328                 cmd->result = DID_TRANSPORT_DISRUPTED << 16;
 329                 break;
 330
 331         case SCS_QUEUE_FULL:
 332                 /*
 333                  * SCSI Mid-Layer handles device queue full
 334                  */
 335                 cmd->result = DID_OK << 16 | sts_entry->scsiStatus;
 336                 DEBUG2(printk("scsi%ld:%d:%d: %s: QUEUE FULL detected "
 337                               "compl=%02x, scsi=%02x, state=%02x, iFlags=%02x,"
 338                               " iResp=%02x\n", ha->host_no, cmd->device->id,
 339                               cmd->device->lun, __func__,
 340                               sts_entry->completionStatus,
 341                               sts_entry->scsiStatus, sts_entry->state_flags,
 342                               sts_entry->iscsiFlags,
 343                               sts_entry->iscsiResponse));
 344                 break;
 345
 346         default:
 347                 cmd->result = DID_ERROR << 16;
 348                 break;
 349         }
 350
 351 status_entry_exit:
 352
 353         /* complete the request, if not waiting for status_continuation pkt */
 354         srb->cc_stat = sts_entry->completionStatus;
 355         if (ha->status_srb == NULL)
 356                 kref_put(&srb->srb_ref, qla4xxx_srb_compl);
 357 }
 358
 359 /**
 360  * qla4xxx_passthru_status_entry - processes passthru status IOCBs (0x3C)
 361  * @ha: Pointer to host adapter structure.
 362  * @sts_entry: Pointer to status entry structure.
 363  **/
 364 static void qla4xxx_passthru_status_entry(struct scsi_qla_host *ha,
 365                                           struct passthru_status *sts_entry)
 366 {
 367         struct iscsi_task *task;
 368         struct ddb_entry *ddb_entry;
 369         struct ql4_task_data *task_data;
 370         struct iscsi_cls_conn *cls_conn;
 371         struct iscsi_conn *conn;
 372         itt_t itt;
 373         uint32_t fw_ddb_index;
 374
 375         itt = sts_entry->handle;
 376         fw_ddb_index = le32_to_cpu(sts_entry->target);
 377
 378         ddb_entry = qla4xxx_lookup_ddb_by_fw_index(ha, fw_ddb_index);
 379
 380         if (ddb_entry == NULL) {
 381                 ql4_printk(KERN_ERR, ha, "%s: Invalid target index = 0x%x\n",
 382                            __func__, sts_entry->target);
 383                 return;
 384         }
 385
 386         cls_conn = ddb_entry->conn;
 387         conn = cls_conn->dd_data;
 388         spin_lock(&conn->session->lock);
 389         task = iscsi_itt_to_task(conn, itt);
 390         spin_unlock(&conn->session->lock);
 391
 392         if (task == NULL) {
 393                 ql4_printk(KERN_ERR, ha, "%s: Task is NULL\n", __func__);
 394                 return;
 395         }
 396
 397         task_data = task->dd_data;
 398         memcpy(&task_data->sts, sts_entry, sizeof(struct passthru_status));
 399         ha->iocb_cnt -= task_data->iocb_req_cnt;
 400         queue_work(ha->task_wq, &task_data->task_work);
 401 }
 402
 403 static struct mrb *qla4xxx_del_mrb_from_active_array(struct scsi_qla_host *ha,
 404                                                      uint32_t index)
 405 {
 406         struct mrb *mrb = NULL;
 407
 408         /* validate handle and remove from active array */
 409         if (index >= MAX_MRB)
 410                 return mrb;
 411
 412         mrb = ha->active_mrb_array[index];
 413         ha->active_mrb_array[index] = NULL;
 414         if (!mrb)
 415                 return mrb;
 416
 417         /* update counters */
 418         ha->iocb_cnt -= mrb->iocb_cnt;
 419
 420         return mrb;
 421 }
 422
 423 static void qla4xxx_mbox_status_entry(struct scsi_qla_host *ha,
 424                                       struct mbox_status_iocb *mbox_sts_entry)
 425 {
 426         struct mrb *mrb;
 427         uint32_t status;
 428         uint32_t data_size;
 429
 430         mrb = qla4xxx_del_mrb_from_active_array(ha,
 431                                         le32_to_cpu(mbox_sts_entry->handle));
 432
 433         if (mrb == NULL) {
 434                 ql4_printk(KERN_WARNING, ha, "%s: mrb[%d] is null\n", __func__,
 435                            mbox_sts_entry->handle);
 436                 return;
 437         }
 438
 439         switch (mrb->mbox_cmd) {
 440         case MBOX_CMD_PING:
 441                 DEBUG2(ql4_printk(KERN_INFO, ha, "%s: mbox_cmd = 0x%x, "
 442                                   "mbox_sts[0] = 0x%x, mbox_sts[6] = 0x%x\n",
 443                                   __func__, mrb->mbox_cmd,
 444                                   mbox_sts_entry->out_mbox[0],
 445                                   mbox_sts_entry->out_mbox[6]));
 446
 447                 if (mbox_sts_entry->out_mbox[0] == MBOX_STS_COMMAND_COMPLETE)
 448                         status = ISCSI_PING_SUCCESS;
 449                 else
 450                         status = mbox_sts_entry->out_mbox[6];
 451
 452                 data_size = sizeof(mbox_sts_entry->out_mbox);
 453
 454                 qla4xxx_post_ping_evt_work(ha, status, mrb->pid, data_size,
 455                                         (uint8_t *) mbox_sts_entry->out_mbox);
 456                 break;
 457
 458         default:
 459                 DEBUG2(ql4_printk(KERN_WARNING, ha, "%s: invalid mbox_cmd = "
 460                                   "0x%x\n", __func__, mrb->mbox_cmd));
 461         }
 462
 463         kfree(mrb);
 464         return;
 465 }
 466
 467 /**
 468  * qla4xxx_process_response_queue - process response queue completions
 469  * @ha: Pointer to host adapter structure.
 470  *
 471  * This routine process response queue completions in interrupt context.
 472  * Hardware_lock locked upon entry
 473  **/
 474 void qla4xxx_process_response_queue(struct scsi_qla_host *ha)
 475 {
 476         uint32_t count = 0;
 477         struct srb *srb = NULL;
 478         struct status_entry *sts_entry;
 479
 480         /* Process all responses from response queue */
 481         while ((ha->response_ptr->signature != RESPONSE_PROCESSED)) {
 482                 sts_entry = (struct status_entry *) ha->response_ptr;
 483                 count++;
 484
 485                 /* Advance pointers for next entry */
 486                 if (ha->response_out == (RESPONSE_QUEUE_DEPTH - 1)) {
 487                         ha->response_out = 0;
 488                         ha->response_ptr = ha->response_ring;
 489                 } else {
 490                         ha->response_out++;
 491                         ha->response_ptr++;
 492                 }
 493
 494                 /* process entry */
 495                 switch (sts_entry->hdr.entryType) {
 496                 case ET_STATUS:
 497                         /* Common status */
 498                         qla4xxx_status_entry(ha, sts_entry);
 499                         break;
 500
 501                 case ET_PASSTHRU_STATUS:
 502                         if (sts_entry->hdr.systemDefined == SD_ISCSI_PDU)
 503                                 qla4xxx_passthru_status_entry(ha,
 504                                         (struct passthru_status *)sts_entry);
 505                         else
 506                                 ql4_printk(KERN_ERR, ha,
 507                                            "%s: Invalid status received\n",
 508                                            __func__);
 509
 510                         break;
 511
 512                 case ET_STATUS_CONTINUATION:
 513                         qla4xxx_status_cont_entry(ha,
 514                                 (struct status_cont_entry *) sts_entry);
 515                         break;
 516
 517                 case ET_COMMAND:
 518                         /* ISP device queue is full. Command not
 519                          * accepted by ISP.  Queue command for
 520                          * later */
 521
 522                         srb = qla4xxx_del_from_active_array(ha,
 523                                                     le32_to_cpu(sts_entry->
 524                                                                 handle));
 525                         if (srb == NULL)
 526                                 goto exit_prq_invalid_handle;
 527
 528                         DEBUG2(printk("scsi%ld: %s: FW device queue full, "
 529                                       "srb %p\n", ha->host_no, __func__, srb));
 530
 531                         /* ETRY normally by sending it back with
 532                          * DID_BUS_BUSY */
 533                         srb->cmd->result = DID_BUS_BUSY << 16;
 534                         kref_put(&srb->srb_ref, qla4xxx_srb_compl);
 535                         break;
 536
 537                 case ET_CONTINUE:
 538                         /* Just throw away the continuation entries */
 539                         DEBUG2(printk("scsi%ld: %s: Continuation entry - "
 540                                       "ignoring\n", ha->host_no, __func__));
 541                         break;
 542
 543                 case ET_MBOX_STATUS:
 544                         DEBUG2(ql4_printk(KERN_INFO, ha,
 545                                           "%s: mbox status IOCB\n", __func__));
 546                         qla4xxx_mbox_status_entry(ha,
 547                                         (struct mbox_status_iocb *)sts_entry);
 548                         break;
 549
 550                 default:
 551                         /*
 552                          * Invalid entry in response queue, reset RISC
 553                          * firmware.
 554                          */
 555                         DEBUG2(printk("scsi%ld: %s: Invalid entry %x in "
 556                                       "response queue \n", ha->host_no,
 557                                       __func__,
 558                                       sts_entry->hdr.entryType));
 559                         goto exit_prq_error;
 560                 }
 561                 ((struct response *)sts_entry)->signature = RESPONSE_PROCESSED;
 562                 wmb();
 563         }
 564
 565         /*
 566          * Tell ISP we're done with response(s). This also clears the interrupt.
 567          */
 568         ha->isp_ops->complete_iocb(ha);
 569
 570         return;
 571
 572 exit_prq_invalid_handle:
 573         DEBUG2(printk("scsi%ld: %s: Invalid handle(srb)=%p type=%x IOCS=%x\n",
 574                       ha->host_no, __func__, srb, sts_entry->hdr.entryType,
 575                       sts_entry->completionStatus));
 576
 577 exit_prq_error:
 578         ha->isp_ops->complete_iocb(ha);
 579         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 580 }
 581
 582 /**
 583  * qla4_83xx_loopback_in_progress: Is loopback in progress?
 584  * @ha: Pointer to host adapter structure.
 585  * @ret: 1 = loopback in progress, 0 = loopback not in progress
 586  **/
 587 static int qla4_83xx_loopback_in_progress(struct scsi_qla_host *ha)
 588 {
 589         int rval = 1;
 590
 591         if (is_qla8032(ha) || is_qla8042(ha)) {
 592                 if ((ha->idc_info.info2 & ENABLE_INTERNAL_LOOPBACK) ||
 593                     (ha->idc_info.info2 & ENABLE_EXTERNAL_LOOPBACK)) {
 594                         DEBUG2(ql4_printk(KERN_INFO, ha,
 595                                           "%s: Loopback diagnostics in progress\n",
 596                                           __func__));
 597                         rval = 1;
 598                 } else {
 599                         DEBUG2(ql4_printk(KERN_INFO, ha,
 600                                           "%s: Loopback diagnostics not in progress\n",
 601                                           __func__));
 602                         rval = 0;
 603                 }
 604         }
 605
 606         return rval;
 607 }
 608
 609 /**
 610  * qla4xxx_isr_decode_mailbox - decodes mailbox status
 611  * @ha: Pointer to host adapter structure.
 612  * @mailbox_status: Mailbox status.
 613  *
 614  * This routine decodes the mailbox status during the ISR.
 615  * Hardware_lock locked upon entry. runs in interrupt context.
 616  **/
 617 static void qla4xxx_isr_decode_mailbox(struct scsi_qla_host * ha,
 618                                        uint32_t mbox_status)
 619 {
 620         int i;
 621         uint32_t mbox_sts[MBOX_AEN_REG_COUNT];
 622         __le32 __iomem *mailbox_out;
 623
 624         if (is_qla8032(ha) || is_qla8042(ha))
 625                 mailbox_out = &ha->qla4_83xx_reg->mailbox_out[0];
 626         else if (is_qla8022(ha))
 627                 mailbox_out = &ha->qla4_82xx_reg->mailbox_out[0];
 628         else
 629                 mailbox_out = &ha->reg->mailbox[0];
 630
 631         if ((mbox_status == MBOX_STS_BUSY) ||
 632             (mbox_status == MBOX_STS_INTERMEDIATE_COMPLETION) ||
 633             (mbox_status >> 12 == MBOX_COMPLETION_STATUS)) {
 634                 ha->mbox_status[0] = mbox_status;
 635
 636                 if (test_bit(AF_MBOX_COMMAND, &ha->flags)) {
 637                         /*
 638                          * Copy all mailbox registers to a temporary
 639                          * location and set mailbox command done flag
 640                          */
 641                         for (i = 0; i < ha->mbox_status_count; i++)
 642                                 ha->mbox_status[i] = readl(&mailbox_out[i]);
 643
 644                         set_bit(AF_MBOX_COMMAND_DONE, &ha->flags);
 645
 646                         if (test_bit(AF_MBOX_COMMAND_NOPOLL, &ha->flags))
 647                                 complete(&ha->mbx_intr_comp);
 648                 }
 649         } else if (mbox_status >> 12 == MBOX_ASYNC_EVENT_STATUS) {
 650                 for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
 651                         mbox_sts[i] = readl(&mailbox_out[i]);
 652
 653                 /* Immediately process the AENs that don't require much work.
 654                  * Only queue the database_changed AENs */
 655                 if (ha->aen_log.count < MAX_AEN_ENTRIES) {
 656                         for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
 657                                 ha->aen_log.entry[ha->aen_log.count].mbox_sts[i] =
 658                                     mbox_sts[i];
 659                         ha->aen_log.count++;
 660                 }
 661                 switch (mbox_status) {
 662                 case MBOX_ASTS_SYSTEM_ERROR:
 663                         /* Log Mailbox registers */
 664                         ql4_printk(KERN_INFO, ha, "%s: System Err\n", __func__);
 665                         qla4xxx_dump_registers(ha);
 666
 667                         if ((is_qla8022(ha) && ql4xdontresethba) ||
 668                             ((is_qla8032(ha) || is_qla8042(ha)) &&
 669                              qla4_83xx_idc_dontreset(ha))) {
 670                                 DEBUG2(printk("scsi%ld: %s:Don't Reset HBA\n",
 671                                     ha->host_no, __func__));
 672                         } else {
 673                                 set_bit(AF_GET_CRASH_RECORD, &ha->flags);
 674                                 set_bit(DPC_RESET_HA, &ha->dpc_flags);
 675                         }
 676                         break;
 677
 678                 case MBOX_ASTS_REQUEST_TRANSFER_ERROR:
 679                 case MBOX_ASTS_RESPONSE_TRANSFER_ERROR:
 680                 case MBOX_ASTS_NVRAM_INVALID:
 681                 case MBOX_ASTS_IP_ADDRESS_CHANGED:
 682                 case MBOX_ASTS_DHCP_LEASE_EXPIRED:
 683                         DEBUG2(printk("scsi%ld: AEN %04x, ERROR Status, "
 684                                       "Reset HA\n", ha->host_no, mbox_status));
 685                         if (is_qla80XX(ha))
 686                                 set_bit(DPC_RESET_HA_FW_CONTEXT,
 687                                         &ha->dpc_flags);
 688                         else
 689                                 set_bit(DPC_RESET_HA, &ha->dpc_flags);
 690                         break;
 691
 692                 case MBOX_ASTS_LINK_UP:
 693                         set_bit(AF_LINK_UP, &ha->flags);
 694                         if (test_bit(AF_INIT_DONE, &ha->flags))
 695                                 set_bit(DPC_LINK_CHANGED, &ha->dpc_flags);
 696
 697                         ql4_printk(KERN_INFO, ha, "%s: LINK UP\n", __func__);
 698                         qla4xxx_post_aen_work(ha, ISCSI_EVENT_LINKUP,
 699                                               sizeof(mbox_sts),
 700                                               (uint8_t *) mbox_sts);
 701                         break;
 702
 703                 case MBOX_ASTS_LINK_DOWN:
 704                         clear_bit(AF_LINK_UP, &ha->flags);
 705                         if (test_bit(AF_INIT_DONE, &ha->flags)) {
 706                                 set_bit(DPC_LINK_CHANGED, &ha->dpc_flags);
 707                                 qla4xxx_wake_dpc(ha);
 708                         }
 709
 710                         ql4_printk(KERN_INFO, ha, "%s: LINK DOWN\n", __func__);
 711                         qla4xxx_post_aen_work(ha, ISCSI_EVENT_LINKDOWN,
 712                                               sizeof(mbox_sts),
 713                                               (uint8_t *) mbox_sts);
 714                         break;
 715
 716                 case MBOX_ASTS_HEARTBEAT:
 717                         ha->seconds_since_last_heartbeat = 0;
 718                         break;
 719
 720                 case MBOX_ASTS_DHCP_LEASE_ACQUIRED:
 721                         DEBUG2(printk("scsi%ld: AEN %04x DHCP LEASE "
 722                                       "ACQUIRED\n", ha->host_no, mbox_status));
 723                         set_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags);
 724                         break;
 725
 726                 case MBOX_ASTS_PROTOCOL_STATISTIC_ALARM:
 727                 case MBOX_ASTS_SCSI_COMMAND_PDU_REJECTED: /* Target
 728                                                            * mode
 729                                                            * only */
 730                 case MBOX_ASTS_UNSOLICITED_PDU_RECEIVED:  /* Connection mode */
 731                 case MBOX_ASTS_IPSEC_SYSTEM_FATAL_ERROR:
 732                 case MBOX_ASTS_SUBNET_STATE_CHANGE:
 733                 case MBOX_ASTS_DUPLICATE_IP:
 734                         /* No action */
 735                         DEBUG2(printk("scsi%ld: AEN %04x\n", ha->host_no,
 736                                       mbox_status));
 737                         break;
 738
 739                 case MBOX_ASTS_IP_ADDR_STATE_CHANGED:
 740                         printk("scsi%ld: AEN %04x, mbox_sts[2]=%04x, "
 741                             "mbox_sts[3]=%04x\n", ha->host_no, mbox_sts[0],
 742                             mbox_sts[2], mbox_sts[3]);
 743
 744                         /* mbox_sts[2] = Old ACB state
 745                          * mbox_sts[3] = new ACB state */
 746                         if ((mbox_sts[3] == ACB_STATE_VALID) &&
 747                             ((mbox_sts[2] == ACB_STATE_TENTATIVE) ||
 748                             (mbox_sts[2] == ACB_STATE_ACQUIRING)))
 749                                 set_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags);
 750                         else if ((mbox_sts[3] == ACB_STATE_ACQUIRING) &&
 751                                  (mbox_sts[2] == ACB_STATE_VALID)) {
 752                                 if (is_qla80XX(ha))
 753                                         set_bit(DPC_RESET_HA_FW_CONTEXT,
 754                                                 &ha->dpc_flags);
 755                                 else
 756                                         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 757                         } else if ((mbox_sts[3] == ACB_STATE_UNCONFIGURED))
 758                                 complete(&ha->disable_acb_comp);
 759                         break;
 760
 761                 case MBOX_ASTS_MAC_ADDRESS_CHANGED:
 762                 case MBOX_ASTS_DNS:
 763                         /* No action */
 764                         DEBUG2(printk(KERN_INFO "scsi%ld: AEN %04x, "
 765                                       "mbox_sts[1]=%04x, mbox_sts[2]=%04x\n",
 766                                       ha->host_no, mbox_sts[0],
 767                                       mbox_sts[1], mbox_sts[2]));
 768                         break;
 769
 770                 case MBOX_ASTS_SELF_TEST_FAILED:
 771                 case MBOX_ASTS_LOGIN_FAILED:
 772                         /* No action */
 773                         DEBUG2(printk("scsi%ld: AEN %04x, mbox_sts[1]=%04x, "
 774                                       "mbox_sts[2]=%04x, mbox_sts[3]=%04x\n",
 775                                       ha->host_no, mbox_sts[0], mbox_sts[1],
 776                                       mbox_sts[2], mbox_sts[3]));
 777                         break;
 778
 779                 case MBOX_ASTS_DATABASE_CHANGED:
 780                         /* Queue AEN information and process it in the DPC
 781                          * routine */
 782                         if (ha->aen_q_count > 0) {
 783
 784                                 /* decrement available counter */
 785                                 ha->aen_q_count--;
 786
 787                                 for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
 788                                         ha->aen_q[ha->aen_in].mbox_sts[i] =
 789                                             mbox_sts[i];
 790
 791                                 /* print debug message */
 792                                 DEBUG2(printk("scsi%ld: AEN[%d] %04x queued "
 793                                               "mb1:0x%x mb2:0x%x mb3:0x%x "
 794                                               "mb4:0x%x mb5:0x%x\n",
 795                                               ha->host_no, ha->aen_in,
 796                                               mbox_sts[0], mbox_sts[1],
 797                                               mbox_sts[2], mbox_sts[3],
 798                                               mbox_sts[4], mbox_sts[5]));
 799
 800                                 /* advance pointer */
 801                                 ha->aen_in++;
 802                                 if (ha->aen_in == MAX_AEN_ENTRIES)
 803                                         ha->aen_in = 0;
 804
 805                                 /* The DPC routine will process the aen */
 806                                 set_bit(DPC_AEN, &ha->dpc_flags);
 807                         } else {
 808                                 DEBUG2(printk("scsi%ld: %s: aen %04x, queue "
 809                                               "overflowed!  AEN LOST!!\n",
 810                                               ha->host_no, __func__,
 811                                               mbox_sts[0]));
 812
 813                                 DEBUG2(printk("scsi%ld: DUMP AEN QUEUE\n",
 814                                               ha->host_no));
 815
 816                                 for (i = 0; i < MAX_AEN_ENTRIES; i++) {
 817                                         DEBUG2(printk("AEN[%d] %04x %04x %04x "
 818                                                       "%04x\n", i, mbox_sts[0],
 819                                                       mbox_sts[1], mbox_sts[2],
 820                                                       mbox_sts[3]));
 821                                 }
 822                         }
 823                         break;
 824
 825                 case MBOX_ASTS_TXSCVR_INSERTED:
 826                         DEBUG2(printk(KERN_WARNING
 827                             "scsi%ld: AEN %04x Transceiver"
 828                             " inserted\n",  ha->host_no, mbox_sts[0]));
 829                         break;
 830
 831                 case MBOX_ASTS_TXSCVR_REMOVED:
 832                         DEBUG2(printk(KERN_WARNING
 833                             "scsi%ld: AEN %04x Transceiver"
 834                             " removed\n",  ha->host_no, mbox_sts[0]));
 835                         break;
 836
 837                 case MBOX_ASTS_IDC_REQUEST_NOTIFICATION:
 838                 {
 839                         uint32_t opcode;
 840                         if (is_qla8032(ha) || is_qla8042(ha)) {
 841                                 DEBUG2(ql4_printk(KERN_INFO, ha,
 842                                                   "scsi%ld: AEN %04x, mbox_sts[1]=%08x, mbox_sts[2]=%08x, mbox_sts[3]=%08x, mbox_sts[4]=%08x\n",
 843                                                   ha->host_no, mbox_sts[0],
 844                                                   mbox_sts[1], mbox_sts[2],
 845                                                   mbox_sts[3], mbox_sts[4]));
 846                                 opcode = mbox_sts[1] >> 16;
 847                                 if ((opcode == MBOX_CMD_SET_PORT_CONFIG) ||
 848                                     (opcode == MBOX_CMD_PORT_RESET)) {
 849                                         set_bit(DPC_POST_IDC_ACK,
 850                                                 &ha->dpc_flags);
 851                                         ha->idc_info.request_desc = mbox_sts[1];
 852                                         ha->idc_info.info1 = mbox_sts[2];
 853                                         ha->idc_info.info2 = mbox_sts[3];
 854                                         ha->idc_info.info3 = mbox_sts[4];
 855                                         qla4xxx_wake_dpc(ha);
 856                                 }
 857                         }
 858                         break;
 859                 }
 860
 861                 case MBOX_ASTS_IDC_COMPLETE:
 862                         if (is_qla8032(ha) || is_qla8042(ha)) {
 863                                 DEBUG2(ql4_printk(KERN_INFO, ha,
 864                                                   "scsi%ld: AEN %04x, mbox_sts[1]=%08x, mbox_sts[2]=%08x, mbox_sts[3]=%08x, mbox_sts[4]=%08x\n",
 865                                                   ha->host_no, mbox_sts[0],
 866                                                   mbox_sts[1], mbox_sts[2],
 867                                                   mbox_sts[3], mbox_sts[4]));
 868                                 DEBUG2(ql4_printk(KERN_INFO, ha,
 869                                                   "scsi:%ld: AEN %04x IDC Complete notification\n",
 870                                                   ha->host_no, mbox_sts[0]));
 871
 872                                 if (qla4_83xx_loopback_in_progress(ha))
 873                                         set_bit(AF_LOOPBACK, &ha->flags);
 874                                 else
 875                                         clear_bit(AF_LOOPBACK, &ha->flags);
 876                         }
 877                         break;
 878
 879                 case MBOX_ASTS_IPV6_DEFAULT_ROUTER_CHANGED:
 880                         DEBUG2(ql4_printk(KERN_INFO, ha,
 881                                           "scsi%ld: AEN %04x, mbox_sts[1]=%08x, mbox_sts[2]=%08x, mbox_sts[3]=%08x, mbox_sts[4]=%08x mbox_sts[5]=%08x\n",
 882                                           ha->host_no, mbox_sts[0], mbox_sts[1],
 883                                           mbox_sts[2], mbox_sts[3], mbox_sts[4],
 884                                           mbox_sts[5]));
 885                         DEBUG2(ql4_printk(KERN_INFO, ha,
 886                                           "scsi%ld: AEN %04x Received IPv6 default router changed notification\n",
 887                                           ha->host_no, mbox_sts[0]));
 888                         break;
 889
 890                 case MBOX_ASTS_INITIALIZATION_FAILED:
 891                         DEBUG2(ql4_printk(KERN_INFO, ha,
 892                                           "scsi%ld: AEN %04x, mbox_sts[3]=%08x\n",
 893                                           ha->host_no, mbox_sts[0],
 894                                           mbox_sts[3]));
 895                         break;
 896
 897                 case MBOX_ASTS_SYSTEM_WARNING_EVENT:
 898                         DEBUG2(ql4_printk(KERN_WARNING, ha,
 899                                           "scsi%ld: AEN %04x, mbox_sts[1]=%08x, mbox_sts[2]=%08x, mbox_sts[3]=%08x, mbox_sts[4]=%08x mbox_sts[5]=%08x\n",
 900                                           ha->host_no, mbox_sts[0], mbox_sts[1],
 901                                           mbox_sts[2], mbox_sts[3], mbox_sts[4],
 902                                           mbox_sts[5]));
 903                         break;
 904
 905                 case MBOX_ASTS_DCBX_CONF_CHANGE:
 906                         DEBUG2(ql4_printk(KERN_INFO, ha,
 907                                           "scsi%ld: AEN %04x, mbox_sts[1]=%08x, mbox_sts[2]=%08x, mbox_sts[3]=%08x, mbox_sts[4]=%08x mbox_sts[5]=%08x\n",
 908                                           ha->host_no, mbox_sts[0], mbox_sts[1],
 909                                           mbox_sts[2], mbox_sts[3], mbox_sts[4],
 910                                           mbox_sts[5]));
 911                         DEBUG2(ql4_printk(KERN_INFO, ha,
 912                                           "scsi%ld: AEN %04x Received DCBX configuration changed notification\n",
 913                                           ha->host_no, mbox_sts[0]));
 914                         break;
 915
 916                 default:
 917                         DEBUG2(printk(KERN_WARNING
 918                                       "scsi%ld: AEN %04x UNKNOWN\n",
 919                                       ha->host_no, mbox_sts[0]));
 920                         break;
 921                 }
 922         } else {
 923                 DEBUG2(printk("scsi%ld: Unknown mailbox status %08X\n",
 924                               ha->host_no, mbox_status));
 925
 926                 ha->mbox_status[0] = mbox_status;
 927         }
 928 }
 929
 930 void qla4_83xx_interrupt_service_routine(struct scsi_qla_host *ha,
 931                                          uint32_t intr_status)
 932 {
 933         /* Process mailbox/asynch event interrupt.*/
 934         if (intr_status) {
 935                 qla4xxx_isr_decode_mailbox(ha,
 936                                 readl(&ha->qla4_83xx_reg->mailbox_out[0]));
 937                 /* clear the interrupt */
 938                 writel(0, &ha->qla4_83xx_reg->risc_intr);
 939         } else {
 940                 qla4xxx_process_response_queue(ha);
 941         }
 942
 943         /* clear the interrupt */
 944         writel(0, &ha->qla4_83xx_reg->mb_int_mask);
 945 }
 946
 947 /**
 948  * qla4_82xx_interrupt_service_routine - isr
 949  * @ha: pointer to host adapter structure.
 950  *
 951  * This is the main interrupt service routine.
 952  * hardware_lock locked upon entry. runs in interrupt context.
 953  **/
 954 void qla4_82xx_interrupt_service_routine(struct scsi_qla_host *ha,
 955     uint32_t intr_status)
 956 {
 957         /* Process response queue interrupt. */
 958         if (intr_status & HSRX_RISC_IOCB_INT)
 959                 qla4xxx_process_response_queue(ha);
 960
 961         /* Process mailbox/asynch event interrupt.*/
 962         if (intr_status & HSRX_RISC_MB_INT)
 963                 qla4xxx_isr_decode_mailbox(ha,
 964                     readl(&ha->qla4_82xx_reg->mailbox_out[0]));
 965
 966         /* clear the interrupt */
 967         writel(0, &ha->qla4_82xx_reg->host_int);
 968         readl(&ha->qla4_82xx_reg->host_int);
 969 }
 970
 971 /**
 972  * qla4xxx_interrupt_service_routine - isr
 973  * @ha: pointer to host adapter structure.
 974  *
 975  * This is the main interrupt service routine.
 976  * hardware_lock locked upon entry. runs in interrupt context.
 977  **/
 978 void qla4xxx_interrupt_service_routine(struct scsi_qla_host * ha,
 979                                        uint32_t intr_status)
 980 {
 981         /* Process response queue interrupt. */
 982         if (intr_status & CSR_SCSI_COMPLETION_INTR)
 983                 qla4xxx_process_response_queue(ha);
 984
 985         /* Process mailbox/asynch event  interrupt.*/
 986         if (intr_status & CSR_SCSI_PROCESSOR_INTR) {
 987                 qla4xxx_isr_decode_mailbox(ha,
 988                                            readl(&ha->reg->mailbox[0]));
 989
 990                 /* Clear Mailbox Interrupt */
 991                 writel(set_rmask(CSR_SCSI_PROCESSOR_INTR),
 992                        &ha->reg->ctrl_status);
 993                 readl(&ha->reg->ctrl_status);
 994         }
 995 }
 996
 997 /**
 998  * qla4_82xx_spurious_interrupt - processes spurious interrupt
 999  * @ha: pointer to host adapter structure.
1000  * @reqs_count: .
1001  *
1002  **/
1003 static void qla4_82xx_spurious_interrupt(struct scsi_qla_host *ha,
1004     uint8_t reqs_count)
1005 {
1006         if (reqs_count)
1007                 return;
1008
1009         DEBUG2(ql4_printk(KERN_INFO, ha, "Spurious Interrupt\n"));
1010         if (is_qla8022(ha)) {
1011                 writel(0, &ha->qla4_82xx_reg->host_int);
1012                 if (test_bit(AF_INTx_ENABLED, &ha->flags))
1013                         qla4_82xx_wr_32(ha, ha->nx_legacy_intr.tgt_mask_reg,
1014                             0xfbff);
1015         }
1016         ha->spurious_int_count++;
1017 }
1018
1019 /**
1020  * qla4xxx_intr_handler - hardware interrupt handler.
1021  * @irq: Unused
1022  * @dev_id: Pointer to host adapter structure
1023  **/
1024 irqreturn_t qla4xxx_intr_handler(int irq, void *dev_id)
1025 {
1026         struct scsi_qla_host *ha;
1027         uint32_t intr_status;
1028         unsigned long flags = 0;
1029         uint8_t reqs_count = 0;
1030
1031         ha = (struct scsi_qla_host *) dev_id;
1032         if (!ha) {
1033                 DEBUG2(printk(KERN_INFO
1034                               "qla4xxx: Interrupt with NULL host ptr\n"));
1035                 return IRQ_NONE;
1036         }
1037
1038         spin_lock_irqsave(&ha->hardware_lock, flags);
1039
1040         ha->isr_count++;
1041         /*
1042          * Repeatedly service interrupts up to a maximum of
1043          * MAX_REQS_SERVICED_PER_INTR
1044          */
1045         while (1) {
1046                 /*
1047                  * Read interrupt status
1048                  */
1049                 if (ha->isp_ops->rd_shdw_rsp_q_in(ha) !=
1050                     ha->response_out)
1051                         intr_status = CSR_SCSI_COMPLETION_INTR;
1052                 else
1053                         intr_status = readl(&ha->reg->ctrl_status);
1054
1055                 if ((intr_status &
1056                     (CSR_SCSI_RESET_INTR|CSR_FATAL_ERROR|INTR_PENDING)) == 0) {
1057                         if (reqs_count == 0)
1058                                 ha->spurious_int_count++;
1059                         break;
1060                 }
1061
1062                 if (intr_status & CSR_FATAL_ERROR) {
1063                         DEBUG2(printk(KERN_INFO "scsi%ld: Fatal Error, "
1064                                       "Status 0x%04x\n", ha->host_no,
1065                                       readl(isp_port_error_status (ha))));
1066
1067                         /* Issue Soft Reset to clear this error condition.
1068                          * This will prevent the RISC from repeatedly
1069                          * interrupting the driver; thus, allowing the DPC to
1070                          * get scheduled to continue error recovery.
1071                          * NOTE: Disabling RISC interrupts does not work in
1072                          * this case, as CSR_FATAL_ERROR overrides
1073                          * CSR_SCSI_INTR_ENABLE */
1074                         if ((readl(&ha->reg->ctrl_status) &
1075                              CSR_SCSI_RESET_INTR) == 0) {
1076                                 writel(set_rmask(CSR_SOFT_RESET),
1077                                        &ha->reg->ctrl_status);
1078                                 readl(&ha->reg->ctrl_status);
1079                         }
1080
1081                         writel(set_rmask(CSR_FATAL_ERROR),
1082                                &ha->reg->ctrl_status);
1083                         readl(&ha->reg->ctrl_status);
1084
1085                         __qla4xxx_disable_intrs(ha);
1086
1087                         set_bit(DPC_RESET_HA, &ha->dpc_flags);
1088
1089                         break;
1090                 } else if (intr_status & CSR_SCSI_RESET_INTR) {
1091                         clear_bit(AF_ONLINE, &ha->flags);
1092                         __qla4xxx_disable_intrs(ha);
1093
1094                         writel(set_rmask(CSR_SCSI_RESET_INTR),
1095                                &ha->reg->ctrl_status);
1096                         readl(&ha->reg->ctrl_status);
1097
1098                         if (!test_bit(AF_HA_REMOVAL, &ha->flags))
1099                                 set_bit(DPC_RESET_HA_INTR, &ha->dpc_flags);
1100
1101                         break;
1102                 } else if (intr_status & INTR_PENDING) {
1103                         ha->isp_ops->interrupt_service_routine(ha, intr_status);
1104                         ha->total_io_count++;
1105                         if (++reqs_count == MAX_REQS_SERVICED_PER_INTR)
1106                                 break;
1107                 }
1108         }
1109
1110         spin_unlock_irqrestore(&ha->hardware_lock, flags);
1111
1112         return IRQ_HANDLED;
1113 }
1114
1115 /**
1116  * qla4_82xx_intr_handler - hardware interrupt handler.
1117  * @irq: Unused
1118  * @dev_id: Pointer to host adapter structure
1119  **/
1120 irqreturn_t qla4_82xx_intr_handler(int irq, void *dev_id)
1121 {
1122         struct scsi_qla_host *ha = dev_id;
1123         uint32_t intr_status;
1124         uint32_t status;
1125         unsigned long flags = 0;
1126         uint8_t reqs_count = 0;
1127
1128         if (unlikely(pci_channel_offline(ha->pdev)))
1129                 return IRQ_HANDLED;
1130
1131         ha->isr_count++;
1132         status = qla4_82xx_rd_32(ha, ISR_INT_VECTOR);
1133         if (!(status & ha->nx_legacy_intr.int_vec_bit))
1134                 return IRQ_NONE;
1135
1136         status = qla4_82xx_rd_32(ha, ISR_INT_STATE_REG);
1137         if (!ISR_IS_LEGACY_INTR_TRIGGERED(status)) {
1138                 DEBUG7(ql4_printk(KERN_INFO, ha,
1139                                   "%s legacy Int not triggered\n", __func__));
1140                 return IRQ_NONE;
1141         }
1142
1143         /* clear the interrupt */
1144         qla4_82xx_wr_32(ha, ha->nx_legacy_intr.tgt_status_reg, 0xffffffff);
1145
1146         /* read twice to ensure write is flushed */
1147         qla4_82xx_rd_32(ha, ISR_INT_VECTOR);
1148         qla4_82xx_rd_32(ha, ISR_INT_VECTOR);
1149
1150         spin_lock_irqsave(&ha->hardware_lock, flags);
1151         while (1) {
1152                 if (!(readl(&ha->qla4_82xx_reg->host_int) &
1153                     ISRX_82XX_RISC_INT)) {
1154                         qla4_82xx_spurious_interrupt(ha, reqs_count);
1155                         break;
1156                 }
1157                 intr_status =  readl(&ha->qla4_82xx_reg->host_status);
1158                 if ((intr_status &
1159                     (HSRX_RISC_MB_INT | HSRX_RISC_IOCB_INT)) == 0)  {
1160                         qla4_82xx_spurious_interrupt(ha, reqs_count);
1161                         break;
1162                 }
1163
1164                 ha->isp_ops->interrupt_service_routine(ha, intr_status);
1165
1166                 /* Enable Interrupt */
1167                 qla4_82xx_wr_32(ha, ha->nx_legacy_intr.tgt_mask_reg, 0xfbff);
1168
1169                 if (++reqs_count == MAX_REQS_SERVICED_PER_INTR)
1170                         break;
1171         }
1172
1173         spin_unlock_irqrestore(&ha->hardware_lock, flags);
1174         return IRQ_HANDLED;
1175 }
1176
1177 #define LEG_INT_PTR_B31         (1 << 31)
1178 #define LEG_INT_PTR_B30         (1 << 30)
1179 #define PF_BITS_MASK            (0xF << 16)
1180
1181 /**
1182  * qla4_83xx_intr_handler - hardware interrupt handler.
1183  * @irq: Unused
1184  * @dev_id: Pointer to host adapter structure
1185  **/
1186 irqreturn_t qla4_83xx_intr_handler(int irq, void *dev_id)
1187 {
1188         struct scsi_qla_host *ha = dev_id;
1189         uint32_t leg_int_ptr = 0;
1190         unsigned long flags = 0;
1191
1192         ha->isr_count++;
1193         leg_int_ptr = readl(&ha->qla4_83xx_reg->leg_int_ptr);
1194
1195         /* Legacy interrupt is valid if bit31 of leg_int_ptr is set */
1196         if (!(leg_int_ptr & LEG_INT_PTR_B31)) {
1197                 DEBUG7(ql4_printk(KERN_ERR, ha,
1198                                   "%s: Legacy Interrupt Bit 31 not set, spurious interrupt!\n",
1199                                   __func__));
1200                 return IRQ_NONE;
1201         }
1202
1203         /* Validate the PCIE function ID set in leg_int_ptr bits [19..16] */
1204         if ((leg_int_ptr & PF_BITS_MASK) != ha->pf_bit) {
1205                 DEBUG7(ql4_printk(KERN_ERR, ha,
1206                                   "%s: Incorrect function ID 0x%x in legacy interrupt register, ha->pf_bit = 0x%x\n",
1207                                   __func__, (leg_int_ptr & PF_BITS_MASK),
1208                                   ha->pf_bit));
1209                 return IRQ_NONE;
1210         }
1211
1212         /* To de-assert legacy interrupt, write 0 to Legacy Interrupt Trigger
1213          * Control register and poll till Legacy Interrupt Pointer register
1214          * bit30 is 0.
1215          */
1216         writel(0, &ha->qla4_83xx_reg->leg_int_trig);
1217         do {
1218                 leg_int_ptr = readl(&ha->qla4_83xx_reg->leg_int_ptr);
1219                 if ((leg_int_ptr & PF_BITS_MASK) != ha->pf_bit)
1220                         break;
1221         } while (leg_int_ptr & LEG_INT_PTR_B30);
1222
1223         spin_lock_irqsave(&ha->hardware_lock, flags);
1224         leg_int_ptr = readl(&ha->qla4_83xx_reg->risc_intr);
1225         ha->isp_ops->interrupt_service_routine(ha, leg_int_ptr);
1226         spin_unlock_irqrestore(&ha->hardware_lock, flags);
1227
1228         return IRQ_HANDLED;
1229 }
1230
1231 irqreturn_t
1232 qla4_8xxx_msi_handler(int irq, void *dev_id)
1233 {
1234         struct scsi_qla_host *ha;
1235
1236         ha = (struct scsi_qla_host *) dev_id;
1237         if (!ha) {
1238                 DEBUG2(printk(KERN_INFO
1239                     "qla4xxx: MSIX: Interrupt with NULL host ptr\n"));
1240                 return IRQ_NONE;
1241         }
1242
1243         ha->isr_count++;
1244         /* clear the interrupt */
1245         qla4_82xx_wr_32(ha, ha->nx_legacy_intr.tgt_status_reg, 0xffffffff);
1246
1247         /* read twice to ensure write is flushed */
1248         qla4_82xx_rd_32(ha, ISR_INT_VECTOR);
1249         qla4_82xx_rd_32(ha, ISR_INT_VECTOR);
1250
1251         return qla4_8xxx_default_intr_handler(irq, dev_id);
1252 }
1253
1254 static irqreturn_t qla4_83xx_mailbox_intr_handler(int irq, void *dev_id)
1255 {
1256         struct scsi_qla_host *ha = dev_id;
1257         unsigned long flags;
1258         uint32_t ival = 0;
1259
1260         spin_lock_irqsave(&ha->hardware_lock, flags);
1261
1262         ival = readl(&ha->qla4_83xx_reg->risc_intr);
1263         if (ival == 0) {
1264                 ql4_printk(KERN_INFO, ha,
1265                            "%s: It is a spurious mailbox interrupt!\n",
1266                            __func__);
1267                 ival = readl(&ha->qla4_83xx_reg->mb_int_mask);
1268                 ival &= ~INT_MASK_FW_MB;
1269                 writel(ival, &ha->qla4_83xx_reg->mb_int_mask);
1270                 goto exit;
1271         }
1272
1273         qla4xxx_isr_decode_mailbox(ha,
1274                                    readl(&ha->qla4_83xx_reg->mailbox_out[0]));
1275         writel(0, &ha->qla4_83xx_reg->risc_intr);
1276         ival = readl(&ha->qla4_83xx_reg->mb_int_mask);
1277         ival &= ~INT_MASK_FW_MB;
1278         writel(ival, &ha->qla4_83xx_reg->mb_int_mask);
1279         ha->isr_count++;
1280 exit:
1281         spin_unlock_irqrestore(&ha->hardware_lock, flags);
1282         return IRQ_HANDLED;
1283 }
1284
1285 /**
1286  * qla4_8xxx_default_intr_handler - hardware interrupt handler.
1287  * @irq: Unused
1288  * @dev_id: Pointer to host adapter structure
1289  *
1290  * This interrupt handler is called directly for MSI-X, and
1291  * called indirectly for MSI.
1292  **/
1293 irqreturn_t
1294 qla4_8xxx_default_intr_handler(int irq, void *dev_id)
1295 {
1296         struct scsi_qla_host *ha = dev_id;
1297         unsigned long   flags;
1298         uint32_t intr_status;
1299         uint8_t reqs_count = 0;
1300
1301         if (is_qla8032(ha) || is_qla8042(ha)) {
1302                 qla4_83xx_mailbox_intr_handler(irq, dev_id);
1303         } else {
1304                 spin_lock_irqsave(&ha->hardware_lock, flags);
1305                 while (1) {
1306                         if (!(readl(&ha->qla4_82xx_reg->host_int) &
1307                             ISRX_82XX_RISC_INT)) {
1308                                 qla4_82xx_spurious_interrupt(ha, reqs_count);
1309                                 break;
1310                         }
1311
1312                         intr_status =  readl(&ha->qla4_82xx_reg->host_status);
1313                         if ((intr_status &
1314                             (HSRX_RISC_MB_INT | HSRX_RISC_IOCB_INT)) == 0) {
1315                                 qla4_82xx_spurious_interrupt(ha, reqs_count);
1316                                 break;
1317                         }
1318
1319                         ha->isp_ops->interrupt_service_routine(ha, intr_status);
1320
1321                         if (++reqs_count == MAX_REQS_SERVICED_PER_INTR)
1322                                 break;
1323                 }
1324                 ha->isr_count++;
1325                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
1326         }
1327         return IRQ_HANDLED;
1328 }
1329
1330 irqreturn_t
1331 qla4_8xxx_msix_rsp_q(int irq, void *dev_id)
1332 {
1333         struct scsi_qla_host *ha = dev_id;
1334         unsigned long flags;
1335         uint32_t ival = 0;
1336
1337         spin_lock_irqsave(&ha->hardware_lock, flags);
1338         if (is_qla8032(ha) || is_qla8042(ha)) {
1339                 ival = readl(&ha->qla4_83xx_reg->iocb_int_mask);
1340                 if (ival == 0) {
1341                         ql4_printk(KERN_INFO, ha, "%s: It is a spurious iocb interrupt!\n",
1342                                    __func__);
1343                         goto exit_msix_rsp_q;
1344                 }
1345                 qla4xxx_process_response_queue(ha);
1346                 writel(0, &ha->qla4_83xx_reg->iocb_int_mask);
1347         } else {
1348                 qla4xxx_process_response_queue(ha);
1349                 writel(0, &ha->qla4_82xx_reg->host_int);
1350         }
1351         ha->isr_count++;
1352 exit_msix_rsp_q:
1353         spin_unlock_irqrestore(&ha->hardware_lock, flags);
1354         return IRQ_HANDLED;
1355 }
1356
1357 /**
1358  * qla4xxx_process_aen - processes AENs generated by firmware
1359  * @ha: pointer to host adapter structure.
1360  * @process_aen: type of AENs to process
1361  *
1362  * Processes specific types of Asynchronous Events generated by firmware.
1363  * The type of AENs to process is specified by process_aen and can be
1364  *      PROCESS_ALL_AENS         0
1365  *      FLUSH_DDB_CHANGED_AENS   1
1366  *      RELOGIN_DDB_CHANGED_AENS 2
1367  **/
1368 void qla4xxx_process_aen(struct scsi_qla_host * ha, uint8_t process_aen)
1369 {
1370         uint32_t mbox_sts[MBOX_AEN_REG_COUNT];
1371         struct aen *aen;
1372         int i;
1373         unsigned long flags;
1374
1375         spin_lock_irqsave(&ha->hardware_lock, flags);
1376         while (ha->aen_out != ha->aen_in) {
1377                 aen = &ha->aen_q[ha->aen_out];
1378                 /* copy aen information to local structure */
1379                 for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
1380                         mbox_sts[i] = aen->mbox_sts[i];
1381
1382                 ha->aen_q_count++;
1383                 ha->aen_out++;
1384
1385                 if (ha->aen_out == MAX_AEN_ENTRIES)
1386                         ha->aen_out = 0;
1387
1388                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
1389
1390                 DEBUG2(printk("qla4xxx(%ld): AEN[%d]=0x%08x, mbx1=0x%08x mbx2=0x%08x"
1391                         " mbx3=0x%08x mbx4=0x%08x\n", ha->host_no,
1392                         (ha->aen_out ? (ha->aen_out-1): (MAX_AEN_ENTRIES-1)),
1393                         mbox_sts[0], mbox_sts[1], mbox_sts[2],
1394                         mbox_sts[3], mbox_sts[4]));
1395
1396                 switch (mbox_sts[0]) {
1397                 case MBOX_ASTS_DATABASE_CHANGED:
1398                         switch (process_aen) {
1399                         case FLUSH_DDB_CHANGED_AENS:
1400                                 DEBUG2(printk("scsi%ld: AEN[%d] %04x, index "
1401                                               "[%d] state=%04x FLUSHED!\n",
1402                                               ha->host_no, ha->aen_out,
1403                                               mbox_sts[0], mbox_sts[2],
1404                                               mbox_sts[3]));
1405                                 break;
1406                         case PROCESS_ALL_AENS:
1407                         default:
1408                                 /* Specific device. */
1409                                 if (mbox_sts[1] == 1)
1410                                         qla4xxx_process_ddb_changed(ha,
1411                                                 mbox_sts[2], mbox_sts[3],
1412                                                 mbox_sts[4]);
1413                                 break;
1414                         }
1415                 }
1416                 spin_lock_irqsave(&ha->hardware_lock, flags);
1417         }
1418         spin_unlock_irqrestore(&ha->hardware_lock, flags);
1419 }
1420
1421 int qla4xxx_request_irqs(struct scsi_qla_host *ha)
1422 {
1423         int ret;
1424
1425         if (is_qla40XX(ha))
1426                 goto try_intx;
1427
1428         if (ql4xenablemsix == 2) {
1429                 /* Note: MSI Interrupts not supported for ISP8324 and ISP8042 */
1430                 if (is_qla8032(ha) || is_qla8042(ha)) {
1431                         ql4_printk(KERN_INFO, ha, "%s: MSI Interrupts not supported for ISP%04x, Falling back-to INTx mode\n",
1432                                    __func__, ha->pdev->device);
1433                         goto try_intx;
1434                 }
1435                 goto try_msi;
1436         }
1437
1438         if (ql4xenablemsix == 0 || ql4xenablemsix != 1)
1439                 goto try_intx;
1440
1441         /* Trying MSI-X */
1442         ret = qla4_8xxx_enable_msix(ha);
1443         if (!ret) {
1444                 DEBUG2(ql4_printk(KERN_INFO, ha,
1445                     "MSI-X: Enabled (0x%X).\n", ha->revision_id));
1446                 goto irq_attached;
1447         } else {
1448                 if (is_qla8032(ha) || is_qla8042(ha)) {
1449                         ql4_printk(KERN_INFO, ha, "%s: ISP%04x: MSI-X: Falling back-to INTx mode. ret = %d\n",
1450                                    __func__, ha->pdev->device, ret);
1451                         goto try_intx;
1452                 }
1453         }
1454
1455         ql4_printk(KERN_WARNING, ha,
1456             "MSI-X: Falling back-to MSI mode -- %d.\n", ret);
1457
1458 try_msi:
1459         /* Trying MSI */
1460         ret = pci_enable_msi(ha->pdev);
1461         if (!ret) {
1462                 ret = request_irq(ha->pdev->irq, qla4_8xxx_msi_handler,
1463                         0, DRIVER_NAME, ha);
1464                 if (!ret) {
1465                         DEBUG2(ql4_printk(KERN_INFO, ha, "MSI: Enabled.\n"));
1466                         set_bit(AF_MSI_ENABLED, &ha->flags);
1467                         goto irq_attached;
1468                 } else {
1469                         ql4_printk(KERN_WARNING, ha,
1470                             "MSI: Failed to reserve interrupt %d "
1471                             "already in use.\n", ha->pdev->irq);
1472                         pci_disable_msi(ha->pdev);
1473                 }
1474         }
1475
1476         /*
1477          * Prevent interrupts from falling back to INTx mode in cases where
1478          * interrupts cannot get acquired through MSI-X or MSI mode.
1479          */
1480         if (is_qla8022(ha)) {
1481                 ql4_printk(KERN_WARNING, ha, "IRQ not attached -- %d.\n", ret);
1482                 goto irq_not_attached;
1483         }
1484 try_intx:
1485         /* Trying INTx */
1486         ret = request_irq(ha->pdev->irq, ha->isp_ops->intr_handler,
1487             IRQF_SHARED, DRIVER_NAME, ha);
1488         if (!ret) {
1489                 DEBUG2(ql4_printk(KERN_INFO, ha, "INTx: Enabled.\n"));
1490                 set_bit(AF_INTx_ENABLED, &ha->flags);
1491                 goto irq_attached;
1492
1493         } else {
1494                 ql4_printk(KERN_WARNING, ha,
1495                     "INTx: Failed to reserve interrupt %d already in"
1496                     " use.\n", ha->pdev->irq);
1497                 goto irq_not_attached;
1498         }
1499
1500 irq_attached:
1501         set_bit(AF_IRQ_ATTACHED, &ha->flags);
1502         ha->host->irq = ha->pdev->irq;
1503         ql4_printk(KERN_INFO, ha, "%s: irq %d attached\n",
1504             __func__, ha->pdev->irq);
1505 irq_not_attached:
1506         return ret;
1507 }
1508
1509 void qla4xxx_free_irqs(struct scsi_qla_host *ha)
1510 {
1511         if (test_and_clear_bit(AF_IRQ_ATTACHED, &ha->flags)) {
1512                 if (test_bit(AF_MSIX_ENABLED, &ha->flags)) {
1513                         qla4_8xxx_disable_msix(ha);
1514                 } else if (test_and_clear_bit(AF_MSI_ENABLED, &ha->flags)) {
1515                         free_irq(ha->pdev->irq, ha);
1516                         pci_disable_msi(ha->pdev);
1517                 } else if (test_and_clear_bit(AF_INTx_ENABLED, &ha->flags)) {
1518                         free_irq(ha->pdev->irq, ha);
1519                 }
1520         }
1521 }