[SCSI] Initial Commit of qla4xxx

open-iSCSI driver for Qlogic Corporation's iSCSI HBAs

Signed-off-by: Ravi Anand <ravi.anand@qlogic.com>
Signed-off-by: David Somayajulu <david.somayajulu@qlogic.com>
Signed-off-by: Doug Maxey <dwm@bubba.enoyolf.org>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 797 insertions, 0 deletions

diff --git a/drivers/scsi/qla4xxx/ql4_isr.c b/drivers/scsi/qla4xxx/ql4_isr.c
new file mode 100644
index 000000000000..b584317608d1
--- /dev/null
+++ b/drivers/scsi/qla4xxx/ql4_isr.c
@@ -0,0 +1,797 @@
+/*
+ * QLogic iSCSI HBA Driver
+ * Copyright (c)  2003-2006 QLogic Corporation
+ *
+ * See LICENSE.qla4xxx for copyright and licensing details.
+ */
+
+#include "ql4_def.h"
+
+/**
+ * qla2x00_process_completed_request() - Process a Fast Post response.
+ * @ha: SCSI driver HA context
+ * @index: SRB index
+ **/
+static void qla4xxx_process_completed_request(struct scsi_qla_host *ha,
+					      uint32_t index)
+{
+	struct srb *srb;
+
+	srb = qla4xxx_del_from_active_array(ha, index);
+	if (srb) {
+		/* Save ISP completion status */
+		srb->cmd->result = DID_OK << 16;
+		qla4xxx_srb_compl(ha, srb);
+	} else {
+		DEBUG2(printk("scsi%ld: Invalid ISP SCSI completion handle = "
+			      "%d\n", ha->host_no, index));
+		set_bit(DPC_RESET_HA, &ha->dpc_flags);
+	}
+}
+
+/**
+ * qla4xxx_status_entry - processes status IOCBs
+ * @ha: Pointer to host adapter structure.
+ * @sts_entry: Pointer to status entry structure.
+ **/
+static void qla4xxx_status_entry(struct scsi_qla_host *ha,
+				 struct status_entry *sts_entry)
+{
+	uint8_t scsi_status;
+	struct scsi_cmnd *cmd;
+	struct srb *srb;
+	struct ddb_entry *ddb_entry;
+	uint32_t residual;
+	uint16_t sensebytecnt;
+
+	if (sts_entry->completionStatus == SCS_COMPLETE &&
+	    sts_entry->scsiStatus == 0) {
+		qla4xxx_process_completed_request(ha,
+						  le32_to_cpu(sts_entry->
+							      handle));
+		return;
+	}
+
+	srb = qla4xxx_del_from_active_array(ha, le32_to_cpu(sts_entry->handle));
+	if (!srb) {
+		/* FIXMEdg: Don't we need to reset ISP in this case??? */
+		DEBUG2(printk(KERN_WARNING "scsi%ld: %s: Status Entry invalid "
+			      "handle 0x%x, sp=%p. This cmd may have already "
+			      "been completed.\n", ha->host_no, __func__,
+			      le32_to_cpu(sts_entry->handle), srb));
+		return;
+	}
+
+	cmd = srb->cmd;
+	if (cmd == NULL) {
+		DEBUG2(printk("scsi%ld: %s: Command already returned back to "
+			      "OS pkt->handle=%d srb=%p srb->state:%d\n",
+			      ha->host_no, __func__, sts_entry->handle,
+			      srb, srb->state));
+		dev_warn(&ha->pdev->dev, "Command is NULL:"
+			" already returned to OS (srb=%p)\n", srb);
+		return;
+	}
+
+	ddb_entry = srb->ddb;
+	if (ddb_entry == NULL) {
+		cmd->result = DID_NO_CONNECT << 16;
+		goto status_entry_exit;
+	}
+
+	residual = le32_to_cpu(sts_entry->residualByteCnt);
+
+	/* Translate ISP error to a Linux SCSI error. */
+	scsi_status = sts_entry->scsiStatus;
+	switch (sts_entry->completionStatus) {
+	case SCS_COMPLETE:
+		if (scsi_status == 0) {
+			cmd->result = DID_OK << 16;
+			break;
+		}
+
+		if (sts_entry->iscsiFlags &
+		    (ISCSI_FLAG_RESIDUAL_OVER|ISCSI_FLAG_RESIDUAL_UNDER))
+			cmd->resid = residual;
+
+		cmd->result = DID_OK << 16 | scsi_status;
+
+		if (scsi_status != SCSI_CHECK_CONDITION)
+			break;
+
+		/* Copy Sense Data into sense buffer. */
+		memset(cmd->sense_buffer, 0, sizeof(cmd->sense_buffer));
+
+		sensebytecnt = le16_to_cpu(sts_entry->senseDataByteCnt);
+		if (sensebytecnt == 0)
+			break;
+
+		memcpy(cmd->sense_buffer, sts_entry->senseData,
+		       min(sensebytecnt,
+			   (uint16_t) sizeof(cmd->sense_buffer)));
+
+		DEBUG2(printk("scsi%ld:%d:%d:%d: %s: sense key = %x, "
+			      "ASC/ASCQ = %02x/%02x\n", ha->host_no,
+			      cmd->device->channel, cmd->device->id,
+			      cmd->device->lun, __func__,
+			      sts_entry->senseData[2] & 0x0f,
+			      sts_entry->senseData[12],
+			      sts_entry->senseData[13]));
+
+		srb->flags |= SRB_GOT_SENSE;
+		break;
+
+	case SCS_INCOMPLETE:
+		/* Always set the status to DID_ERROR, since
+		 * all conditions result in that status anyway */
+		cmd->result = DID_ERROR << 16;
+		break;
+
+	case SCS_RESET_OCCURRED:
+		DEBUG2(printk("scsi%ld:%d:%d:%d: %s: Device RESET occurred\n",
+			      ha->host_no, cmd->device->channel,
+			      cmd->device->id, cmd->device->lun, __func__));
+
+		cmd->result = DID_RESET << 16;
+		break;
+
+	case SCS_ABORTED:
+		DEBUG2(printk("scsi%ld:%d:%d:%d: %s: Abort occurred\n",
+			      ha->host_no, cmd->device->channel,
+			      cmd->device->id, cmd->device->lun, __func__));
+
+		cmd->result = DID_RESET << 16;
+		break;
+
+	case SCS_TIMEOUT:
+		DEBUG2(printk(KERN_INFO "scsi%ld:%d:%d:%d: Timeout\n",
+			      ha->host_no, cmd->device->channel,
+			      cmd->device->id, cmd->device->lun));
+
+		cmd->result = DID_BUS_BUSY << 16;
+
+		/*
+		 * Mark device missing so that we won't continue to send
+		 * I/O to this device.	We should get a ddb state change
+		 * AEN soon.
+		 */
+		if (atomic_read(&ddb_entry->state) == DDB_STATE_ONLINE)
+			qla4xxx_mark_device_missing(ha, ddb_entry);
+		break;
+
+	case SCS_DATA_UNDERRUN:
+	case SCS_DATA_OVERRUN:
+		if (sts_entry->iscsiFlags & ISCSI_FLAG_RESIDUAL_OVER) {
+			DEBUG2(printk("scsi%ld:%d:%d:%d: %s: " "Data overrun, "
+				      "residual = 0x%x\n", ha->host_no,
+				      cmd->device->channel, cmd->device->id,
+				      cmd->device->lun, __func__, residual));
+
+			cmd->result = DID_ERROR << 16;
+			break;
+		}
+
+		if ((sts_entry->iscsiFlags & ISCSI_FLAG_RESIDUAL_UNDER) == 0) {
+			/*
+			 * Firmware detected a SCSI transport underrun
+			 * condition
+			 */
+			cmd->resid = residual;
+			DEBUG2(printk("scsi%ld:%d:%d:%d: %s: UNDERRUN status "
+				      "detected, xferlen = 0x%x, residual = "
+				      "0x%x\n",
+				      ha->host_no, cmd->device->channel,
+				      cmd->device->id,
+				      cmd->device->lun, __func__,
+				      cmd->request_bufflen,
+				      residual));
+		}
+
+		/*
+		 * If there is scsi_status, it takes precedense over
+		 * underflow condition.
+		 */
+		if (scsi_status != 0) {
+			cmd->result = DID_OK << 16 | scsi_status;
+
+			if (scsi_status != SCSI_CHECK_CONDITION)
+				break;
+
+			/* Copy Sense Data into sense buffer. */
+			memset(cmd->sense_buffer, 0,
+			       sizeof(cmd->sense_buffer));
+
+			sensebytecnt =
+				le16_to_cpu(sts_entry->senseDataByteCnt);
+			if (sensebytecnt == 0)
+				break;
+
+			memcpy(cmd->sense_buffer, sts_entry->senseData,
+			       min(sensebytecnt,
+				   (uint16_t) sizeof(cmd->sense_buffer)));
+
+			DEBUG2(printk("scsi%ld:%d:%d:%d: %s: sense key = %x, "
+				      "ASC/ASCQ = %02x/%02x\n", ha->host_no,
+				      cmd->device->channel, cmd->device->id,
+				      cmd->device->lun, __func__,
+				      sts_entry->senseData[2] & 0x0f,
+				      sts_entry->senseData[12],
+				      sts_entry->senseData[13]));
+		} else {
+			/*
+			 * If RISC reports underrun and target does not
+			 * report it then we must have a lost frame, so
+			 * tell upper layer to retry it by reporting a
+			 * bus busy.
+			 */
+			if ((sts_entry->iscsiFlags &
+			     ISCSI_FLAG_RESIDUAL_UNDER) == 0) {
+				cmd->result = DID_BUS_BUSY << 16;
+			} else if ((cmd->request_bufflen - residual) <
+				   cmd->underflow) {
+				/*
+				 * Handle mid-layer underflow???
+				 *
+				 * For kernels less than 2.4, the driver must
+				 * return an error if an underflow is detected.
+				 * For kernels equal-to and above 2.4, the
+				 * mid-layer will appearantly handle the
+				 * underflow by detecting the residual count --
+				 * unfortunately, we do not see where this is
+				 * actually being done.	 In the interim, we
+				 * will return DID_ERROR.
+				 */
+				DEBUG2(printk("scsi%ld:%d:%d:%d: %s: "
+					      "Mid-layer Data underrun, "
+					      "xferlen = 0x%x, "
+					      "residual = 0x%x\n", ha->host_no,
+					      cmd->device->channel,
+					      cmd->device->id,
+					      cmd->device->lun, __func__,
+					      cmd->request_bufflen, residual));
+
+				cmd->result = DID_ERROR << 16;
+			} else {
+				cmd->result = DID_OK << 16;
+			}
+		}
+		break;
+
+	case SCS_DEVICE_LOGGED_OUT:
+	case SCS_DEVICE_UNAVAILABLE:
+		/*
+		 * Mark device missing so that we won't continue to
+		 * send I/O to this device.  We should get a ddb
+		 * state change AEN soon.
+		 */
+		if (atomic_read(&ddb_entry->state) == DDB_STATE_ONLINE)
+			qla4xxx_mark_device_missing(ha, ddb_entry);
+
+		cmd->result = DID_BUS_BUSY << 16;
+		break;
+
+	case SCS_QUEUE_FULL:
+		/*
+		 * SCSI Mid-Layer handles device queue full
+		 */
+		cmd->result = DID_OK << 16 | sts_entry->scsiStatus;
+		DEBUG2(printk("scsi%ld:%d:%d: %s: QUEUE FULL detected "
+			      "compl=%02x, scsi=%02x, state=%02x, iFlags=%02x,"
+			      " iResp=%02x\n", ha->host_no, cmd->device->id,
+			      cmd->device->lun, __func__,
+			      sts_entry->completionStatus,
+			      sts_entry->scsiStatus, sts_entry->state_flags,
+			      sts_entry->iscsiFlags,
+			      sts_entry->iscsiResponse));
+		break;
+
+	default:
+		cmd->result = DID_ERROR << 16;
+		break;
+	}
+
+status_entry_exit:
+
+	/* complete the request */
+	srb->cc_stat = sts_entry->completionStatus;
+	qla4xxx_srb_compl(ha, srb);
+}
+
+/**
+ * qla4xxx_process_response_queue - process response queue completions
+ * @ha: Pointer to host adapter structure.
+ *
+ * This routine process response queue completions in interrupt context.
+ * Hardware_lock locked upon entry
+ **/
+static void qla4xxx_process_response_queue(struct scsi_qla_host * ha)
+{
+	uint32_t count = 0;
+	struct srb *srb = NULL;
+	struct status_entry *sts_entry;
+
+	/* Process all responses from response queue */
+	while ((ha->response_in =
+		(uint16_t)le32_to_cpu(ha->shadow_regs->rsp_q_in)) !=
+	       ha->response_out) {
+		sts_entry = (struct status_entry *) ha->response_ptr;
+		count++;
+
+		/* Advance pointers for next entry */
+		if (ha->response_out == (RESPONSE_QUEUE_DEPTH - 1)) {
+			ha->response_out = 0;
+			ha->response_ptr = ha->response_ring;
+		} else {
+			ha->response_out++;
+			ha->response_ptr++;
+		}
+
+		/* process entry */
+		switch (sts_entry->hdr.entryType) {
+		case ET_STATUS:
+			/*
+			 * Common status - Single completion posted in single
+			 * IOSB.
+			 */
+			qla4xxx_status_entry(ha, sts_entry);
+			break;
+
+		case ET_PASSTHRU_STATUS:
+			break;
+
+		case ET_STATUS_CONTINUATION:
+			/* Just throw away the status continuation entries */
+			DEBUG2(printk("scsi%ld: %s: Status Continuation entry "
+				      "- ignoring\n", ha->host_no, __func__));
+			break;
+
+		case ET_COMMAND:
+			/* ISP device queue is full. Command not
+			 * accepted by ISP.  Queue command for
+			 * later */
+
+			srb = qla4xxx_del_from_active_array(ha,
+						    le32_to_cpu(sts_entry->
+								handle));
+			if (srb == NULL)
+				goto exit_prq_invalid_handle;
+
+			DEBUG2(printk("scsi%ld: %s: FW device queue full, "
+				      "srb %p\n", ha->host_no, __func__, srb));
+
+			/* ETRY normally by sending it back with
+			 * DID_BUS_BUSY */
+			srb->cmd->result = DID_BUS_BUSY << 16;
+			qla4xxx_srb_compl(ha, srb);
+			break;
+
+		case ET_CONTINUE:
+			/* Just throw away the continuation entries */
+			DEBUG2(printk("scsi%ld: %s: Continuation entry - "
+				      "ignoring\n", ha->host_no, __func__));
+			break;
+
+		default:
+			/*
+			 * Invalid entry in response queue, reset RISC
+			 * firmware.
+			 */
+			DEBUG2(printk("scsi%ld: %s: Invalid entry %x in "
+				      "response queue \n", ha->host_no,
+				      __func__,
+				      sts_entry->hdr.entryType));
+			goto exit_prq_error;
+		}
+	}
+
+	/*
+	 * Done with responses, update the ISP For QLA4010, this also clears
+	 * the interrupt.
+	 */
+	writel(ha->response_out, &ha->reg->rsp_q_out);
+	readl(&ha->reg->rsp_q_out);
+
+	return;
+
+exit_prq_invalid_handle:
+	DEBUG2(printk("scsi%ld: %s: Invalid handle(srb)=%p type=%x IOCS=%x\n",
+		      ha->host_no, __func__, srb, sts_entry->hdr.entryType,
+		      sts_entry->completionStatus));
+
+exit_prq_error:
+	writel(ha->response_out, &ha->reg->rsp_q_out);
+	readl(&ha->reg->rsp_q_out);
+
+	set_bit(DPC_RESET_HA, &ha->dpc_flags);
+}
+
+/**
+ * qla4xxx_isr_decode_mailbox - decodes mailbox status
+ * @ha: Pointer to host adapter structure.
+ * @mailbox_status: Mailbox status.
+ *
+ * This routine decodes the mailbox status during the ISR.
+ * Hardware_lock locked upon entry. runs in interrupt context.
+ **/
+static void qla4xxx_isr_decode_mailbox(struct scsi_qla_host * ha,
+				       uint32_t mbox_status)
+{
+	int i;
+
+	if ((mbox_status == MBOX_STS_BUSY) ||
+	    (mbox_status == MBOX_STS_INTERMEDIATE_COMPLETION) ||
+	    (mbox_status >> 12 == MBOX_COMPLETION_STATUS)) {
+		ha->mbox_status[0] = mbox_status;
+
+		if (test_bit(AF_MBOX_COMMAND, &ha->flags)) {
+			/*
+			 * Copy all mailbox registers to a temporary
+			 * location and set mailbox command done flag
+			 */
+			for (i = 1; i < ha->mbox_status_count; i++)
+				ha->mbox_status[i] =
+					readl(&ha->reg->mailbox[i]);
+
+			set_bit(AF_MBOX_COMMAND_DONE, &ha->flags);
+			wake_up(&ha->mailbox_wait_queue);
+		}
+	} else if (mbox_status >> 12 == MBOX_ASYNC_EVENT_STATUS) {
+		/* Immediately process the AENs that don't require much work.
+		 * Only queue the database_changed AENs */
+		switch (mbox_status) {
+		case MBOX_ASTS_SYSTEM_ERROR:
+			/* Log Mailbox registers */
+			if (ql4xdontresethba) {
+				DEBUG2(printk("%s:Dont Reset HBA\n",
+					      __func__));
+			} else {
+				set_bit(AF_GET_CRASH_RECORD, &ha->flags);
+				set_bit(DPC_RESET_HA, &ha->dpc_flags);
+			}
+			break;
+
+		case MBOX_ASTS_REQUEST_TRANSFER_ERROR:
+		case MBOX_ASTS_RESPONSE_TRANSFER_ERROR:
+		case MBOX_ASTS_NVRAM_INVALID:
+		case MBOX_ASTS_IP_ADDRESS_CHANGED:
+		case MBOX_ASTS_DHCP_LEASE_EXPIRED:
+			DEBUG2(printk("scsi%ld: AEN %04x, ERROR Status, "
+				      "Reset HA\n", ha->host_no, mbox_status));
+			set_bit(DPC_RESET_HA, &ha->dpc_flags);
+			break;
+
+		case MBOX_ASTS_LINK_UP:
+			DEBUG2(printk("scsi%ld: AEN %04x Adapter LINK UP\n",
+				      ha->host_no, mbox_status));
+			set_bit(AF_LINK_UP, &ha->flags);
+			break;
+
+		case MBOX_ASTS_LINK_DOWN:
+			DEBUG2(printk("scsi%ld: AEN %04x Adapter LINK DOWN\n",
+				      ha->host_no, mbox_status));
+			clear_bit(AF_LINK_UP, &ha->flags);
+			break;
+
+		case MBOX_ASTS_HEARTBEAT:
+			ha->seconds_since_last_heartbeat = 0;
+			break;
+
+		case MBOX_ASTS_DHCP_LEASE_ACQUIRED:
+			DEBUG2(printk("scsi%ld: AEN %04x DHCP LEASE "
+				      "ACQUIRED\n", ha->host_no, mbox_status));
+			set_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags);
+			break;
+
+		case MBOX_ASTS_PROTOCOL_STATISTIC_ALARM:
+		case MBOX_ASTS_SCSI_COMMAND_PDU_REJECTED: /* Target
+							   * mode
+							   * only */
+		case MBOX_ASTS_UNSOLICITED_PDU_RECEIVED:  /* Connection mode */
+		case MBOX_ASTS_IPSEC_SYSTEM_FATAL_ERROR:
+		case MBOX_ASTS_SUBNET_STATE_CHANGE:
+			/* No action */
+			DEBUG2(printk("scsi%ld: AEN %04x\n", ha->host_no,
+				      mbox_status));
+			break;
+
+		case MBOX_ASTS_MAC_ADDRESS_CHANGED:
+		case MBOX_ASTS_DNS:
+			/* No action */
+			DEBUG2(printk(KERN_INFO "scsi%ld: AEN %04x, "
+				      "mbox_sts[1]=%04x, mbox_sts[2]=%04x\n",
+				      ha->host_no, mbox_status,
+				      readl(&ha->reg->mailbox[1]),
+				      readl(&ha->reg->mailbox[2])));
+			break;
+
+		case MBOX_ASTS_SELF_TEST_FAILED:
+		case MBOX_ASTS_LOGIN_FAILED:
+			/* No action */
+			DEBUG2(printk("scsi%ld: AEN %04x, mbox_sts[1]=%04x, "
+				      "mbox_sts[2]=%04x, mbox_sts[3]=%04x\n",
+				      ha->host_no, mbox_status,
+				      readl(&ha->reg->mailbox[1]),
+				      readl(&ha->reg->mailbox[2]),
+				      readl(&ha->reg->mailbox[3])));
+			break;
+
+		case MBOX_ASTS_DATABASE_CHANGED:
+			/* Queue AEN information and process it in the DPC
+			 * routine */
+			if (ha->aen_q_count > 0) {
+				/* advance pointer */
+				if (ha->aen_in == (MAX_AEN_ENTRIES - 1))
+					ha->aen_in = 0;
+				else
+					ha->aen_in++;
+
+				/* decrement available counter */
+				ha->aen_q_count--;
+
+				for (i = 1; i < MBOX_AEN_REG_COUNT; i++)
+					ha->aen_q[ha->aen_in].mbox_sts[i] =
+						readl(&ha->reg->mailbox[i]);
+
+				ha->aen_q[ha->aen_in].mbox_sts[0] = mbox_status;
+
+				/* print debug message */
+				DEBUG2(printk("scsi%ld: AEN[%d] %04x queued"
+					      " mb1:0x%x mb2:0x%x mb3:0x%x mb4:0x%x\n",
+					      ha->host_no, ha->aen_in,
+					      mbox_status,
+					      ha->aen_q[ha->aen_in].mbox_sts[1],
+					      ha->aen_q[ha->aen_in].mbox_sts[2],
+					      ha->aen_q[ha->aen_in].mbox_sts[3],
+					      ha->aen_q[ha->aen_in].  mbox_sts[4]));
+
+				/* The DPC routine will process the aen */
+				set_bit(DPC_AEN, &ha->dpc_flags);
+			} else {
+				DEBUG2(printk("scsi%ld: %s: aen %04x, queue "
+					      "overflowed!  AEN LOST!!\n",
+					      ha->host_no, __func__,
+					      mbox_status));
+
+				DEBUG2(printk("scsi%ld: DUMP AEN QUEUE\n",
+					      ha->host_no));
+
+				for (i = 0; i < MAX_AEN_ENTRIES; i++) {
+					DEBUG2(printk("AEN[%d] %04x %04x %04x "
+						      "%04x\n", i,
+						      ha->aen_q[i].mbox_sts[0],
+						      ha->aen_q[i].mbox_sts[1],
+						      ha->aen_q[i].mbox_sts[2],
+						      ha->aen_q[i].mbox_sts[3]));
+				}
+			}
+			break;
+
+		default:
+			DEBUG2(printk(KERN_WARNING
+				      "scsi%ld: AEN %04x UNKNOWN\n",
+				      ha->host_no, mbox_status));
+			break;
+		}
+	} else {
+		DEBUG2(printk("scsi%ld: Unknown mailbox status %08X\n",
+			      ha->host_no, mbox_status));
+
+		ha->mbox_status[0] = mbox_status;
+	}
+}
+
+/**
+ * qla4xxx_interrupt_service_routine - isr
+ * @ha: pointer to host adapter structure.
+ *
+ * This is the main interrupt service routine.
+ * hardware_lock locked upon entry. runs in interrupt context.
+ **/
+void qla4xxx_interrupt_service_routine(struct scsi_qla_host * ha,
+				       uint32_t intr_status)
+{
+	/* Process response queue interrupt. */
+	if (intr_status & CSR_SCSI_COMPLETION_INTR)
+		qla4xxx_process_response_queue(ha);
+
+	/* Process mailbox/asynch event	 interrupt.*/
+	if (intr_status & CSR_SCSI_PROCESSOR_INTR) {
+		qla4xxx_isr_decode_mailbox(ha,
+					   readl(&ha->reg->mailbox[0]));
+
+		/* Clear Mailbox Interrupt */
+		writel(set_rmask(CSR_SCSI_PROCESSOR_INTR),
+		       &ha->reg->ctrl_status);
+		readl(&ha->reg->ctrl_status);
+	}
+}
+
+/**
+ * qla4xxx_intr_handler - hardware interrupt handler.
+ * @irq: Unused
+ * @dev_id: Pointer to host adapter structure
+ * @regs: Unused
+ **/
+irqreturn_t qla4xxx_intr_handler(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct scsi_qla_host *ha;
+	uint32_t intr_status;
+	unsigned long flags = 0;
+	uint8_t reqs_count = 0;
+
+	ha = (struct scsi_qla_host *) dev_id;
+	if (!ha) {
+		DEBUG2(printk(KERN_INFO
+			      "qla4xxx: Interrupt with NULL host ptr\n"));
+		return IRQ_NONE;
+	}
+
+	spin_lock_irqsave(&ha->hardware_lock, flags);
+
+	/*
+	 * Repeatedly service interrupts up to a maximum of
+	 * MAX_REQS_SERVICED_PER_INTR
+	 */
+	while (1) {
+		/*
+		 * Read interrupt status
+		 */
+		if (le32_to_cpu(ha->shadow_regs->rsp_q_in) !=
+		    ha->response_out)
+			intr_status = CSR_SCSI_COMPLETION_INTR;
+		else
+			intr_status = readl(&ha->reg->ctrl_status);
+
+		if ((intr_status &
+		     (CSR_SCSI_RESET_INTR|CSR_FATAL_ERROR|INTR_PENDING)) ==
+		    0) {
+			if (reqs_count == 0)
+				ha->spurious_int_count++;
+			break;
+		}
+
+		if (intr_status & CSR_FATAL_ERROR) {
+			DEBUG2(printk(KERN_INFO "scsi%ld: Fatal Error, "
+				      "Status 0x%04x\n", ha->host_no,
+				      readl(isp_port_error_status (ha))));
+
+			/* Issue Soft Reset to clear this error condition.
+			 * This will prevent the RISC from repeatedly
+			 * interrupting the driver; thus, allowing the DPC to
+			 * get scheduled to continue error recovery.
+			 * NOTE: Disabling RISC interrupts does not work in
+			 * this case, as CSR_FATAL_ERROR overrides
+			 * CSR_SCSI_INTR_ENABLE */
+			if ((readl(&ha->reg->ctrl_status) &
+			     CSR_SCSI_RESET_INTR) == 0) {
+				writel(set_rmask(CSR_SOFT_RESET),
+				       &ha->reg->ctrl_status);
+				readl(&ha->reg->ctrl_status);
+			}
+
+			writel(set_rmask(CSR_FATAL_ERROR),
+			       &ha->reg->ctrl_status);
+			readl(&ha->reg->ctrl_status);
+
+			__qla4xxx_disable_intrs(ha);
+
+			set_bit(DPC_RESET_HA, &ha->dpc_flags);
+
+			break;
+		} else if (intr_status & CSR_SCSI_RESET_INTR) {
+			clear_bit(AF_ONLINE, &ha->flags);
+			__qla4xxx_disable_intrs(ha);
+
+			writel(set_rmask(CSR_SCSI_RESET_INTR),
+			       &ha->reg->ctrl_status);
+			readl(&ha->reg->ctrl_status);
+
+			set_bit(DPC_RESET_HA_INTR, &ha->dpc_flags);
+
+			break;
+		} else if (intr_status & INTR_PENDING) {
+			qla4xxx_interrupt_service_routine(ha, intr_status);
+			ha->total_io_count++;
+			if (++reqs_count == MAX_REQS_SERVICED_PER_INTR)
+				break;
+
+			intr_status = 0;
+		}
+	}
+
+	spin_unlock_irqrestore(&ha->hardware_lock, flags);
+
+	return IRQ_HANDLED;
+}
+
+/**
+ * qla4xxx_process_aen - processes AENs generated by firmware
+ * @ha: pointer to host adapter structure.
+ * @process_aen: type of AENs to process
+ *
+ * Processes specific types of Asynchronous Events generated by firmware.
+ * The type of AENs to process is specified by process_aen and can be
+ *	PROCESS_ALL_AENS	 0
+ *	FLUSH_DDB_CHANGED_AENS	 1
+ *	RELOGIN_DDB_CHANGED_AENS 2
+ **/
+void qla4xxx_process_aen(struct scsi_qla_host * ha, uint8_t process_aen)
+{
+	uint32_t mbox_sts[MBOX_AEN_REG_COUNT];
+	struct aen *aen;
+	int i;
+	unsigned long flags;
+
+	spin_lock_irqsave(&ha->hardware_lock, flags);
+	while (ha->aen_out != ha->aen_in) {
+		/* Advance pointers for next entry */
+		if (ha->aen_out == (MAX_AEN_ENTRIES - 1))
+			ha->aen_out = 0;
+		else
+			ha->aen_out++;
+
+		ha->aen_q_count++;
+		aen = &ha->aen_q[ha->aen_out];
+
+		/* copy aen information to local structure */
+		for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
+			mbox_sts[i] = aen->mbox_sts[i];
+
+		spin_unlock_irqrestore(&ha->hardware_lock, flags);
+
+		DEBUG(printk("scsi%ld: AEN[%d] %04x, index [%d] state=%04x "
+			     "mod=%x conerr=%08x \n", ha->host_no, ha->aen_out,
+			     mbox_sts[0], mbox_sts[2], mbox_sts[3],
+			     mbox_sts[1], mbox_sts[4]));
+
+		switch (mbox_sts[0]) {
+		case MBOX_ASTS_DATABASE_CHANGED:
+			if (process_aen == FLUSH_DDB_CHANGED_AENS) {
+				DEBUG2(printk("scsi%ld: AEN[%d] %04x, index "
+					      "[%d] state=%04x FLUSHED!\n",
+					      ha->host_no, ha->aen_out,
+					      mbox_sts[0], mbox_sts[2],
+					      mbox_sts[3]));
+				break;
+			} else if (process_aen == RELOGIN_DDB_CHANGED_AENS) {
+				/* for use during init time, we only want to
+				 * relogin non-active ddbs */
+				struct ddb_entry *ddb_entry;
+
+				ddb_entry =
+					/* FIXME: name length? */
+					qla4xxx_lookup_ddb_by_fw_index(ha,
+								       mbox_sts[2]);
+				if (!ddb_entry)
+					break;
+
+				ddb_entry->dev_scan_wait_to_complete_relogin =
+					0;
+				ddb_entry->dev_scan_wait_to_start_relogin =
+					jiffies +
+					((ddb_entry->default_time2wait +
+					  4) * HZ);
+
+				DEBUG2(printk("scsi%ld: ddb index [%d] initate"
+					      " RELOGIN after %d seconds\n",
+					      ha->host_no,
+					      ddb_entry->fw_ddb_index,
+					      ddb_entry->default_time2wait +
+					      4));
+				break;
+			}
+
+			if (mbox_sts[1] == 0) {	/* Global DB change. */
+				qla4xxx_reinitialize_ddb_list(ha);
+			} else if (mbox_sts[1] == 1) {	/* Specific device. */
+				qla4xxx_process_ddb_changed(ha, mbox_sts[2],
+							    mbox_sts[3]);
+			}
+			break;
+		}
+		spin_lock_irqsave(&ha->hardware_lock, flags);
+	}
+	spin_unlock_irqrestore(&ha->hardware_lock, flags);
+
+}
+