linux/drivers/scsi/qla2xxx/qla_isr.c

/*
 * QLogic Fibre Channel HBA Driver
 * Copyright (c)  2003-2008 QLogic Corporation
 *
 * See LICENSE.qla2xxx for copyright and licensing details.
 */
#include "qla_def.h"

#include <linux/delay.h>
#include <scsi/scsi_tcq.h>

static void qla2x00_mbx_completion(scsi_qla_host_t *, uint16_t);
static void qla2x00_process_completed_request(struct scsi_qla_host *,
	struct req_que *, uint32_t);
static void qla2x00_status_entry(scsi_qla_host_t *, struct rsp_que *, void *);
static void qla2x00_status_cont_entry(struct rsp_que *, sts_cont_entry_t *);
static void qla2x00_error_entry(scsi_qla_host_t *, struct rsp_que *,
	sts_entry_t *);

/**
 * qla2100_intr_handler() - Process interrupts for the ISP2100 and ISP2200.
 * @irq:
 * @dev_id: SCSI driver HA context
 *
 * Called by system whenever the host adapter generates an interrupt.
 *
 * Returns handled flag.
 */
irqreturn_t
qla2100_intr_handler(int irq, void *dev_id)
{
	scsi_qla_host_t	*vha;
	struct qla_hw_data *ha;
	struct device_reg_2xxx __iomem *reg;
	int		status;
	unsigned long	iter;
	uint16_t	hccr;
	uint16_t	mb[4];
	struct rsp_que *rsp;
	unsigned long	flags;

	rsp = (struct rsp_que *) dev_id;
	if (!rsp) {
		printk(KERN_INFO
		    "%s(): NULL response queue pointer\n", __func__);
		return (IRQ_NONE);
	}

	ha = rsp->hw;
	reg = &ha->iobase->isp;
	status = 0;

	spin_lock_irqsave(&ha->hardware_lock, flags);
	vha = pci_get_drvdata(ha->pdev);
	for (iter = 50; iter--; ) {
		hccr = RD_REG_WORD(&reg->hccr);
		if (hccr & HCCR_RISC_PAUSE) {
			if (pci_channel_offline(ha->pdev))
				break;

			/*
			 * Issue a "HARD" reset in order for the RISC interrupt
			 * bit to be cleared.  Schedule a big hammmer to get
			 * out of the RISC PAUSED state.
			 */
			WRT_REG_WORD(&reg->hccr, HCCR_RESET_RISC);
			RD_REG_WORD(&reg->hccr);

			ha->isp_ops->fw_dump(vha, 1);
			set_bit(ISP_ABORT_NEEDED, &vha->dpc_flags);
			break;
		} else if ((RD_REG_WORD(&reg->istatus) & ISR_RISC_INT) == 0)
			break;

		if (RD_REG_WORD(&reg->semaphore) & BIT_0) {
			WRT_REG_WORD(&reg->hccr, HCCR_CLR_RISC_INT);
			RD_REG_WORD(&reg->hccr);

			/* Get mailbox data. */
			mb[0] = RD_MAILBOX_REG(ha, reg, 0);
			if (mb[0] > 0x3fff && mb[0] < 0x8000) {
				qla2x00_mbx_completion(vha, mb[0]);
				status |= MBX_INTERRUPT;
			} else if (mb[0] > 0x7fff && mb[0] < 0xc000) {
				mb[1] = RD_MAILBOX_REG(ha, reg, 1);
				mb[2] = RD_MAILBOX_REG(ha, reg, 2);
				mb[3] = RD_MAILBOX_REG(ha, reg, 3);
				qla2x00_async_event(vha, rsp, mb);
			} else {
				/*EMPTY*/
				DEBUG2(printk("scsi(%ld): Unrecognized "
				    "interrupt type (%d).\n",
				    vha->host_no, mb[0]));
			}
			/* Release mailbox registers. */
			WRT_REG_WORD(&reg->semaphore, 0);
			RD_REG_WORD(&reg->semaphore);
		} else {
			qla2x00_process_response_queue(rsp);

			WRT_REG_WORD(&reg->hccr, HCCR_CLR_RISC_INT);
			RD_REG_WORD(&reg->hccr);
		}
	}
	spin_unlock_irqrestore(&ha->hardware_lock, flags);

	if (test_bit(MBX_INTR_WAIT, &ha->mbx_cmd_flags) &&
	    (status & MBX_INTERRUPT) && ha->flags.mbox_int) {
		set_bit(MBX_INTERRUPT, &ha->mbx_cmd_flags);
		complete(&ha->mbx_intr_comp);
	}

	return (IRQ_HANDLED);
}

/**
 * qla2300_intr_handler() - Process interrupts for the ISP23xx and ISP63xx.
 * @irq:
 * @dev_id: SCSI driver HA context
 *
 * Called by system whenever the host adapter generates an interrupt.
 *
 * Returns handled flag.
 */
irqreturn_t
qla2300_intr_handler(int irq, void *dev_id)
{
	scsi_qla_host_t	*vha;
	struct device_reg_2xxx __iomem *reg;
	int		status;
	unsigned long	iter;
	uint32_t	stat;
	uint16_t	hccr;
	uint16_t	mb[4];
	struct rsp_que *rsp;
	struct qla_hw_data *ha;
	unsigned long	flags;

	rsp = (struct rsp_que *) dev_id;
	if (!rsp) {
		printk(KERN_INFO
		    "%s(): NULL response queue pointer\n", __func__);
		return (IRQ_NONE);
	}

	ha = rsp->hw;
	reg = &ha->iobase->isp;
	status = 0;

	spin_lock_irqsave(&ha->hardware_lock, flags);
	vha = pci_get_drvdata(ha->pdev);
	for (iter = 50; iter--; ) {
		stat = RD_REG_DWORD(&reg->u.isp2300.host_status);
		if (stat & HSR_RISC_PAUSED) {
			if (pci_channel_offline(ha->pdev))
				break;

			hccr = RD_REG_WORD(&reg->hccr);
			if (hccr & (BIT_15 | BIT_13 | BIT_11 | BIT_8))
				qla_printk(KERN_INFO, ha, "Parity error -- "
				    "HCCR=%x, Dumping firmware!\n", hccr);
			else
				qla_printk(KERN_INFO, ha, "RISC paused -- "
				    "HCCR=%x, Dumping firmware!\n", hccr);

			/*
			 * Issue a "HARD" reset in order for the RISC
			 * interrupt bit to be cleared.  Schedule a big
			 * hammmer to get out of the RISC PAUSED state.
			 */
			WRT_REG_WORD(&reg->hccr, HCCR_RESET_RISC);
			RD_REG_WORD(&reg->hccr);

			ha->isp_ops->fw_dump(vha, 1);
			set_bit(ISP_ABORT_NEEDED, &vha->dpc_flags);
			break;
		} else if ((stat & HSR_RISC_INT) == 0)
			break;

		switch (stat & 0xff) {
		case 0x1:
		case 0x2:
		case 0x10:
		case 0x11:
			qla2x00_mbx_completion(vha, MSW(stat));
			status |= MBX_INTERRUPT;

			/* Release mailbox registers. */
			WRT_REG_WORD(&reg->semaphore, 0);
			break;
		case 0x12:
			mb[0] = MSW(stat);
			mb[1] = RD_MAILBOX_REG(ha, reg, 1);
			mb[2] = RD_MAILBOX_REG(ha, reg, 2);
			mb[3] = RD_MAILBOX_REG(ha, reg, 3);
			qla2x00_async_event(vha, rsp, mb);
			break;
		case 0x13:
			qla2x00_process_response_queue(rsp);
			break;
		case 0x15:
			mb[0] = MBA_CMPLT_1_16BIT;
			mb[1] = MSW(stat);
			qla2x00_async_event(vha, rsp, mb);
			break;
		case 0x16:
			mb[0] = MBA_SCSI_COMPLETION;
			mb[1] = MSW(stat);
			mb[2] = RD_MAILBOX_REG(ha, reg, 2);
			qla2x00_async_event(vha, rsp, mb);
			break;
		default:
			DEBUG2(printk("scsi(%ld): Unrecognized interrupt type "
			    "(%d).\n",
			    vha->host_no, stat & 0xff));
			break;
		}
		WRT_REG_WORD(&reg->hccr, HCCR_CLR_RISC_INT);
		RD_REG_WORD_RELAXED(&reg->hccr);
	}
	spin_unlock_irqrestore(&ha->hardware_lock, flags);

	if (test_bit(MBX_INTR_WAIT, &ha->mbx_cmd_flags) &&
	    (status & MBX_INTERRUPT) && ha->flags.mbox_int) {
		set_bit(MBX_INTERRUPT, &ha->mbx_cmd_flags);
		complete(&ha->mbx_intr_comp);
	}

	return (IRQ_HANDLED);
}

/**
 * qla2x00_mbx_completion() - Process mailbox command completions.
 * @ha: SCSI driver HA context
 * @mb0: Mailbox0 register
 */
static void
qla2x00_mbx_completion(scsi_qla_host_t *vha, uint16_t mb0)
{
	uint16_t	cnt;
	uint16_t __iomem *wptr;
	struct qla_hw_data *ha = vha->hw;
	struct device_reg_2xxx __iomem *reg = &ha->iobase->isp;

	/* Load return mailbox registers. */
	ha->flags.mbox_int = 1;
	ha->mailbox_out[0] = mb0;
	wptr = (uint16_t __iomem *)MAILBOX_REG(ha, reg, 1);

	for (cnt = 1; cnt < ha->mbx_count; cnt++) {
		if (IS_QLA2200(ha) && cnt == 8)
			wptr = (uint16_t __iomem *)MAILBOX_REG(ha, reg, 8);
		if (cnt == 4 || cnt == 5)
			ha->mailbox_out[cnt] = qla2x00_debounce_register(wptr);
		else
			ha->mailbox_out[cnt] = RD_REG_WORD(wptr);

		wptr++;
	}

	if (ha->mcp) {
		DEBUG3(printk("%s(%ld): Got mailbox completion. cmd=%x.\n",
		    __func__, vha->host_no, ha->mcp->mb[0]));
	} else {
		DEBUG2_3(printk("%s(%ld): MBX pointer ERROR!\n",
		    __func__, vha->host_no));
	}
}

static void
qla81xx_idc_event(scsi_qla_host_t *vha, uint16_t aen, uint16_t descr)
{
	static char *event[] =
		{ "Complete", "Request Notification", "Time Extension" };
	int rval;
	struct device_reg_24xx __iomem *reg24 = &vha->hw->iobase->isp24;
	uint16_t __iomem *wptr;
	uint16_t cnt, timeout, mb[QLA_IDC_ACK_REGS];

	/* Seed data -- mailbox1 -> mailbox7. */
	wptr = (uint16_t __iomem *)&reg24->mailbox1;
	for (cnt = 0; cnt < QLA_IDC_ACK_REGS; cnt++, wptr++)
		mb[cnt] = RD_REG_WORD(wptr);

	DEBUG2(printk("scsi(%ld): Inter-Driver Commucation %s -- "
	    "%04x %04x %04x %04x %04x %04x %04x.\n", vha->host_no,
	    event[aen & 0xff],
	    mb[0], mb[1], mb[2], mb[3], mb[4], mb[5], mb[6]));

	/* Acknowledgement needed? [Notify && non-zero timeout]. */
	timeout = (descr >> 8) & 0xf;
	if (aen != MBA_IDC_NOTIFY || !timeout)
		return;

	DEBUG2(printk("scsi(%ld): Inter-Driver Commucation %s -- "
	    "ACK timeout=%d.\n", vha->host_no, event[aen & 0xff], timeout));

	rval = qla2x00_post_idc_ack_work(vha, mb);
	if (rval != QLA_SUCCESS)
		qla_printk(KERN_WARNING, vha->hw,
		    "IDC failed to post ACK.\n");
}

/**
 * qla2x00_async_event() - Process aynchronous events.
 * @ha: SCSI driver HA context
 * @mb: Mailbox registers (0 - 3)
 */
void
qla2x00_async_event(scsi_qla_host_t *vha, struct rsp_que *rsp, uint16_t *mb)
{
#define LS_UNKNOWN	2
	static char	*link_speeds[] = { "1", "2", "?", "4", "8", "10" };
	char		*link_speed;
	uint16_t	handle_cnt;
	uint16_t	cnt, mbx;
	uint32_t	handles[5];
	struct qla_hw_data *ha = vha->hw;
	struct device_reg_2xxx __iomem *reg = &ha->iobase->isp;
	struct device_reg_24xx __iomem *reg24 = &ha->iobase->isp24;
	uint32_t	rscn_entry, host_pid;
	uint8_t		rscn_queue_index;
	unsigned long	flags;

	/* Setup to process RIO completion. */
	handle_cnt = 0;
	if (IS_QLA81XX(ha))
		goto skip_rio;
	switch (mb[0]) {
	case MBA_SCSI_COMPLETION:
		handles[0] = le32_to_cpu((uint32_t)((mb[2] << 16) | mb[1]));
		handle_cnt = 1;
		break;
	case MBA_CMPLT_1_16BIT:
		handles[0] = mb[1];
		handle_cnt = 1;
		mb[0] = MBA_SCSI_COMPLETION;
		break;
	case MBA_CMPLT_2_16BIT:
		handles[0] = mb[1];
		handles[1] = mb[2];
		handle_cnt = 2;
		mb[0] = MBA_SCSI_COMPLETION;
		break;
	case MBA_CMPLT_3_16BIT:
		handles[0] = mb[1];
		handles[1] = mb[2];
		handles[2] = mb[3];
		handle_cnt = 3;
		mb[0] = MBA_SCSI_COMPLETION;
		break;
	case MBA_CMPLT_4_16BIT:
		handles[0] = mb[1];
		handles[1] = mb[2];
		handles[2] = mb[3];
		handles[3] = (uint32_t)RD_MAILBOX_REG(ha, reg, 6);
		handle_cnt = 4;
		mb[0] = MBA_SCSI_COMPLETION;
		break;
	case MBA_CMPLT_5_16BIT:
		handles[0] = mb[1];
		handles[1] = mb[2];
		handles[2] = mb[3];
		handles[3] = (uint32_t)RD_MAILBOX_REG(ha, reg, 6);
		handles[4] = (uint32_t)RD_MAILBOX_REG(ha, reg, 7);
		handle_cnt = 5;
		mb[0] = MBA_SCSI_COMPLETION;
		break;
	case MBA_CMPLT_2_32BIT:
		handles[0] = le32_to_cpu((uint32_t)((mb[2] << 16) | mb[1]));
		handles[1] = le32_to_cpu(
		    ((uint32_t)(RD_MAILBOX_REG(ha, reg, 7) << 16)) |
		    RD_MAILBOX_REG(ha, reg, 6));
		handle_cnt = 2;
		mb[0] = MBA_SCSI_COMPLETION;
		break;
	default:
		break;
	}
skip_rio:
	switch (mb[0]) {
	case MBA_SCSI_COMPLETION:	/* Fast Post */
		if (!vha->flags.online)
			break;

		for (cnt = 0; cnt < handle_cnt; cnt++)
			qla2x00_process_completed_request(vha, rsp->req,
				handles[cnt]);
		break;

	case MBA_RESET:			/* Reset */
		DEBUG2(printk("scsi(%ld): Asynchronous RESET.\n",
			vha->host_no));

		set_bit(RESET_MARKER_NEEDED, &vha->dpc_flags);
		break;

	case MBA_SYSTEM_ERR:		/* System Error */
		mbx = IS_QLA81XX(ha) ? RD_REG_WORD(&reg24->mailbox7) : 0;
		qla_printk(KERN_INFO, ha,
		    "ISP System Error - mbx1=%xh mbx2=%xh mbx3=%xh "
		    "mbx7=%xh.\n", mb[1], mb[2], mb[3], mbx);

		ha->isp_ops->fw_dump(vha, 1);

		if (IS_FWI2_CAPABLE(ha)) {
			if (mb[1] == 0 && mb[2] == 0) {
				qla_printk(KERN_ERR, ha,
				    "Unrecoverable Hardware Error: adapter "
				    "marked OFFLINE!\n");
				vha->flags.online = 0;
			} else
				set_bit(ISP_ABORT_NEEDED, &vha->dpc_flags);
		} else if (mb[1] == 0) {
			qla_printk(KERN_INFO, ha,
			    "Unrecoverable Hardware Error: adapter marked "
			    "OFFLINE!\n");
			vha->flags.online = 0;
		} else
			set_bit(ISP_ABORT_NEEDED, &vha->dpc_flags);
		break;

	case MBA_REQ_TRANSFER_ERR:	/* Request Transfer Error */
		DEBUG2(printk("scsi(%ld): ISP Request Transfer Error (%x).\n",
		    vha->host_no, mb[1]));
		qla_printk(KERN_WARNING, ha,
		    "ISP Request Transfer Error (%x).\n", mb[1]);

		set_bit(ISP_ABORT_NEEDED, &vha->dpc_flags);
		break;

	case MBA_RSP_TRANSFER_ERR:	/* Response Transfer Error */
		DEBUG2(printk("scsi(%ld): ISP Response Transfer Error.\n",
		    vha->host_no));
		qla_printk(KERN_WARNING, ha, "ISP Response Transfer Error.\n");

		set_bit(ISP_ABORT_NEEDED, &vha->dpc_flags);
		break;

	case MBA_WAKEUP_THRES:		/* Request Queue Wake-up */
		DEBUG2(printk("scsi(%ld): Asynchronous WAKEUP_THRES.\n",
		    vha->host_no));
		break;

	case MBA_LIP_OCCURRED:		/* Loop Initialization Procedure */
		DEBUG2(printk("scsi(%ld): LIP occurred (%x).\n", vha->host_no,
		    mb[1]));
		qla_printk(KERN_INFO, ha, "LIP occurred (%x).\n", mb[1]);

		if (atomic_read(&vha->loop_state) != LOOP_DOWN) {
			atomic_set(&vha->loop_state, LOOP_DOWN);
			atomic_set(&vha->loop_down_timer, LOOP_DOWN_TIME);
			qla2x00_mark_all_devices_lost(vha, 1);
		}

		if (vha->vp_idx) {
			atomic_set(&vha->vp_state, VP_FAILED);
			fc_vport_set_state(vha->fc_vport, FC_VPORT_FAILED);
		}

		set_bit(REGISTER_FC4_NEEDED, &vha->dpc_flags);
		set_bit(REGISTER_FDMI_NEEDED, &vha->dpc_flags);

		vha->flags.management_server_logged_in = 0;
		qla2x00_post_aen_work(vha, FCH_EVT_LIP, mb[1]);
		break;

	case MBA_LOOP_UP:		/* Loop Up Event */
		if (IS_QLA2100(ha) || IS_QLA2200(ha)) {
			link_speed = link_speeds[0];
			ha->link_data_rate = PORT_SPEED_1GB;
		} else {
			link_speed = link_speeds[LS_UNKNOWN];
			if (mb[1] < 5)
				link_speed = link_speeds[mb[1]];
			else if (mb[1] == 0x13)
				link_speed = link_speeds[5];
			ha->link_data_rate = mb[1];
		}

		DEBUG2(printk("scsi(%ld): Asynchronous LOOP UP (%s Gbps).\n",
		    vha->host_no, link_speed));
		qla_printk(KERN_INFO, ha, "LOOP UP detected (%s Gbps).\n",
		    link_speed);

		vha->flags.management_server_logged_in = 0;
		qla2x00_post_aen_work(vha, FCH_EVT_LINKUP, ha->link_data_rate);
		break;

	case MBA_LOOP_DOWN:		/* Loop Down Event */
		mbx = IS_QLA81XX(ha) ? RD_REG_WORD(&reg24->mailbox4) : 0;
		DEBUG2(printk("scsi(%ld): Asynchronous LOOP DOWN "
		    "(%x %x %x %x).\n", vha->host_no, mb[1], mb[2], mb[3],
		    mbx));
		qla_printk(KERN_INFO, ha,
		    "LOOP DOWN detected (%x %x %x %x).\n", mb[1], mb[2], mb[3],
		    mbx);

		if (atomic_read(&vha->loop_state) != LOOP_DOWN) {
			atomic_set(&vha->loop_state, LOOP_DOWN);
			atomic_set(&vha->loop_down_timer, LOOP_DOWN_TIME);
			vha->device_flags |= DFLG_NO_CABLE;
			qla2x00_mark_all_devices_lost(vha, 1);
		}

		if (vha->vp_idx) {
			atomic_set(&vha->vp_state, VP_FAILED);
			fc_vport_set_state(vha->fc_vport, FC_VPORT_FAILED);
		}

		vha->flags.management_server_logged_in = 0;
		ha->link_data_rate = PORT_SPEED_UNKNOWN;
		qla2x00_post_aen_work(vha, FCH_EVT_LINKDOWN, 0);
		break;

	case MBA_LIP_RESET:		/* LIP reset occurred */
		DEBUG2(printk("scsi(%ld): Asynchronous LIP RESET (%x).\n",
		    vha->host_no, mb[1]));
		qla_printk(KERN_INFO, ha,
		    "LIP reset occurred (%x).\n", mb[1]);

		if (atomic_read(&vha->loop_state) != LOOP_DOWN) {
			atomic_set(&vha->loop_state, LOOP_DOWN);
			atomic_set(&vha->loop_down_timer, LOOP_DOWN_TIME);
			qla2x00_mark_all_devices_lost(vha, 1);
		}

		if (vha->vp_idx) {
			atomic_set(&vha->vp_state, VP_FAILED);
			fc_vport_set_state(vha->fc_vport, FC_VPORT_FAILED);
		}

		set_bit(RESET_MARKER_NEEDED, &vha->dpc_flags);

		ha->operating_mode = LOOP;
		vha->flags.management_server_logged_in = 0;
		qla2x00_post_aen_work(vha, FCH_EVT_LIPRESET, mb[1]);
		break;

	/* case MBA_DCBX_COMPLETE: */
	case MBA_POINT_TO_POINT:	/* Point-to-Point */
		if (IS_QLA2100(ha))
			break;

		if (IS_QLA81XX(ha))
			DEBUG2(printk("scsi(%ld): DCBX Completed -- %04x %04x "
			    "%04x\n", vha->host_no, mb[1], mb[2], mb[3]));
		else
			DEBUG2(printk("scsi(%ld): Asynchronous P2P MODE "
			    "received.\n", vha->host_no));

		/*
		 * Until there's a transition from loop down to loop up, treat
		 * this as loop down only.
		 */
		if (atomic_read(&vha->loop_state) != LOOP_DOWN) {
			atomic_set(&vha->loop_state, LOOP_DOWN);
			if (!atomic_read(&vha->loop_down_timer))
				atomic_set(&vha->loop_down_timer,
				    LOOP_DOWN_TIME);
			qla2x00_mark_all_devices_lost(vha, 1);
		}

		if (vha->vp_idx) {
			atomic_set(&vha->vp_state, VP_FAILED);
			fc_vport_set_state(vha->fc_vport, FC_VPORT_FAILED);
		}

		if (!(test_bit(ABORT_ISP_ACTIVE, &vha->dpc_flags)))
			set_bit(RESET_MARKER_NEEDED, &vha->dpc_flags);

		set_bit(REGISTER_FC4_NEEDED, &vha->dpc_flags);
		set_bit(REGISTER_FDMI_NEEDED, &vha->dpc_flags);

		ha->flags.gpsc_supported = 1;
		vha->flags.management_server_logged_in = 0;
		break;

	case MBA_CHG_IN_CONNECTION:	/* Change in connection mode */
		if (IS_QLA2100(ha))
			break;

		DEBUG2(printk("scsi(%ld): Asynchronous Change In Connection "
		    "received.\n",
		    vha->host_no));
		qla_printk(KERN_INFO, ha,
		    "Configuration change detected: value=%x.\n", mb[1]);

		if (atomic_read(&vha->loop_state) != LOOP_DOWN) {
			atomic_set(&vha->loop_state, LOOP_DOWN);
			if (!atomic_read(&vha->loop_down_timer))
				atomic_set(&vha->loop_down_timer,
				    LOOP_DOWN_TIME);
			qla2x00_mark_all_devices_lost(vha, 1);
		}

		if (vha->vp_idx) {
			atomic_set(&vha->vp_state, VP_FAILED);
			fc_vport_set_state(vha->fc_vport, FC_VPORT_FAILED);
		}

		set_bit(LOOP_RESYNC_NEEDED, &vha->dpc_flags);
		set_bit(LOCAL_LOOP_UPDATE, &vha->dpc_flags);
		break;

	case MBA_PORT_UPDATE:		/* Port database update */
		/*
		 * Handle only global and vn-port update events
		 *
		 * Relevant inputs:
		 * mb[1] = N_Port handle of changed port
		 * OR 0xffff for global event
		 * mb[2] = New login state
		 * 7 = Port logged out
		 * mb[3] = LSB is vp_idx, 0xff = all vps
		 *
		 * Skip processing if:
		 *       Event is global, vp_idx is NOT all vps,
		 *           vp_idx does not match
		 *       Event is not global, vp_idx does not match
		 */
		if ((mb[1] == 0xffff && (mb[3] & 0xff) != 0xff)
			|| (mb[1] != 0xffff)) {
			if (vha->vp_idx != (mb[3] & 0xff))
				break;
		}

		/* Global event -- port logout or port unavailable. */
		if (mb[1] == 0xffff && mb[2] == 0x7) {
			DEBUG2(printk("scsi(%ld): Asynchronous PORT UPDATE.\n",
			    vha->host_no));
			DEBUG(printk(KERN_INFO
			    "scsi(%ld): Port unavailable %04x %04x %04x.\n",
			    vha->host_no, mb[1], mb[2], mb[3]));

			if (atomic_read(&vha->loop_state) != LOOP_DOWN) {
				atomic_set(&vha->loop_state, LOOP_DOWN);
				atomic_set(&vha->loop_down_timer,
				    LOOP_DOWN_TIME);
				vha->device_flags |= DFLG_NO_CABLE;
				qla2x00_mark_all_devices_lost(vha, 1);
			}

			if (vha->vp_idx) {
				atomic_set(&vha->vp_state, VP_FAILED);
				fc_vport_set_state(vha->fc_vport,
				    FC_VPORT_FAILED);
				qla2x00_mark_all_devices_lost(vha, 1);
			}

			vha->flags.management_server_logged_in = 0;
			ha->link_data_rate = PORT_SPEED_UNKNOWN;
			break;
		}

		/*
		 * If PORT UPDATE is global (received LIP_OCCURRED/LIP_RESET
		 * event etc. earlier indicating loop is down) then process
		 * it.  Otherwise ignore it and Wait for RSCN to come in.
		 */
		atomic_set(&vha->loop_down_timer, 0);
		if (atomic_read(&vha->loop_state) != LOOP_DOWN &&
		    atomic_read(&vha->loop_state) != LOOP_DEAD) {
			DEBUG2(printk("scsi(%ld): Asynchronous PORT UPDATE "
			    "ignored %04x/%04x/%04x.\n", vha->host_no, mb[1],
			    mb[2], mb[3]));
			break;
		}

		DEBUG2(printk("scsi(%ld): Asynchronous PORT UPDATE.\n",
		    vha->host_no));
		DEBUG(printk(KERN_INFO
		    "scsi(%ld): Port database changed %04x %04x %04x.\n",
		    vha->host_no, mb[1], mb[2], mb[3]));

		/*
		 * Mark all devices as missing so we will login again.
		 */
		atomic_set(&vha->loop_state, LOOP_UP);

		qla2x00_mark_all_devices_lost(vha, 1);

		vha->flags.rscn_queue_overflow = 1;

		set_bit(LOOP_RESYNC_NEEDED, &vha->dpc_flags);
		set_bit(LOCAL_LOOP_UPDATE, &vha->dpc_flags);
		break;

	case MBA_RSCN_UPDATE:		/* State Change Registration */
		/* Check if the Vport has issued a SCR */
		if (vha->vp_idx && test_bit(VP_SCR_NEEDED, &vha->vp_flags))
			break;
		/* Only handle SCNs for our Vport index. */
		if (ha->flags.npiv_supported && vha->vp_idx != (mb[3] & 0xff))
			break;

		DEBUG2(printk("scsi(%ld): Asynchronous RSCR UPDATE.\n",
		    vha->host_no));
		DEBUG(printk(KERN_INFO
		    "scsi(%ld): RSCN database changed -- %04x %04x %04x.\n",
		    vha->host_no, mb[1], mb[2], mb[3]));

		rscn_entry = ((mb[1] & 0xff) << 16) | mb[2];
		host_pid = (vha->d_id.b.domain << 16) | (vha->d_id.b.area << 8)
				| vha->d_id.b.al_pa;
		if (rscn_entry == host_pid) {
			DEBUG(printk(KERN_INFO
			    "scsi(%ld): Ignoring RSCN update to local host "
			    "port ID (%06x)\n",
			    vha->host_no, host_pid));
			break;
		}

		/* Ignore reserved bits from RSCN-payload. */
		rscn_entry = ((mb[1] & 0x3ff) << 16) | mb[2];
		rscn_queue_index = vha->rscn_in_ptr + 1;
		if (rscn_queue_index == MAX_RSCN_COUNT)
			rscn_queue_index = 0;
		if (rscn_queue_index != vha->rscn_out_ptr) {
			vha->rscn_queue[vha->rscn_in_ptr] = rscn_entry;
			vha->rscn_in_ptr = rscn_queue_index;
		} else {
			vha->flags.rscn_queue_overflow = 1;
		}

		atomic_set(&vha->loop_state, LOOP_UPDATE);
		atomic_set(&vha->loop_down_timer, 0);
		vha->flags.management_server_logged_in = 0;

		set_bit(LOOP_RESYNC_NEEDED, &vha->dpc_flags);
		set_bit(RSCN_UPDATE, &vha->dpc_flags);
		qla2x00_post_aen_work(vha, FCH_EVT_RSCN, rscn_entry);
		break;

	/* case MBA_RIO_RESPONSE: */
	case MBA_ZIO_RESPONSE:
		DEBUG3(printk("scsi(%ld): [R|Z]IO update completion.\n",
		    vha->host_no));

		if (IS_FWI2_CAPABLE(ha))
			qla24xx_process_response_queue(vha, rsp);
		else
			qla2x00_process_response_queue(rsp);
		break;

	case MBA_DISCARD_RND_FRAME:
		DEBUG2(printk("scsi(%ld): Discard RND Frame -- %04x %04x "
		    "%04x.\n", vha->host_no, mb[1], mb[2], mb[3]));
		break;

	case MBA_TRACE_NOTIFICATION:
		DEBUG2(printk("scsi(%ld): Trace Notification -- %04x %04x.\n",
		vha->host_no, mb[1], mb[2]));
		break;

	case MBA_ISP84XX_ALERT:
		DEBUG2(printk("scsi(%ld): ISP84XX Alert Notification -- "
		    "%04x %04x %04x\n", vha->host_no, mb[1], mb[2], mb[3]));

		spin_lock_irqsave(&ha->cs84xx->access_lock, flags);
		switch (mb[1]) {
		case A84_PANIC_RECOVERY:
			qla_printk(KERN_INFO, ha, "Alert 84XX: panic recovery "
			    "%04x %04x\n", mb[2], mb[3]);
			break;
		case A84_OP_LOGIN_COMPLETE:
			ha->cs84xx->op_fw_version = mb[3] << 16 | mb[2];
			DEBUG2(qla_printk(KERN_INFO, ha, "Alert 84XX:"
			    "firmware version %x\n", ha->cs84xx->op_fw_version));
			break;
		case A84_DIAG_LOGIN_COMPLETE:
			ha->cs84xx->diag_fw_version = mb[3] << 16 | mb[2];
			DEBUG2(qla_printk(KERN_INFO, ha, "Alert 84XX:"
			    "diagnostic firmware version %x\n",
			    ha->cs84xx->diag_fw_version));
			break;
		case A84_GOLD_LOGIN_COMPLETE:
			ha->cs84xx->diag_fw_version = mb[3] << 16 | mb[2];
			ha->cs84xx->fw_update = 1;
			DEBUG2(qla_printk(KERN_INFO, ha, "Alert 84XX: gold "
			    "firmware version %x\n",
			    ha->cs84xx->gold_fw_version));
			break;
		default:
			qla_printk(KERN_ERR, ha,
			    "Alert 84xx: Invalid Alert %04x %04x %04x\n",
			    mb[1], mb[2], mb[3]);
		}
		spin_unlock_irqrestore(&ha->cs84xx->access_lock, flags);
		break;
	case MBA_DCBX_START:
		DEBUG2(printk("scsi(%ld): DCBX Started -- %04x %04x %04x\n",
		    vha->host_no, mb[1], mb[2], mb[3]));
		break;
	case MBA_DCBX_PARAM_UPDATE:
		DEBUG2(printk("scsi(%ld): DCBX Parameters Updated -- "
		    "%04x %04x %04x\n", vha->host_no, mb[1], mb[2], mb[3]));
		break;
	case MBA_FCF_CONF_ERR:
		DEBUG2(printk("scsi(%ld): FCF Configuration Error -- "
		    "%04x %04x %04x\n", vha->host_no, mb[1], mb[2], mb[3]));
		break;
	case MBA_IDC_COMPLETE:
	case MBA_IDC_NOTIFY:
	case MBA_IDC_TIME_EXT:
		qla81xx_idc_event(vha, mb[0], mb[1]);
		break;
	}

	if (!vha->vp_idx && ha->num_vhosts)
		qla2x00_alert_all_vps(rsp, mb);
}

static void
qla2x00_adjust_sdev_qdepth_up(struct scsi_device *sdev, void *data)
{
	fc_port_t *fcport = data;
	struct scsi_qla_host *vha = fcport->vha;
	struct qla_hw_data *ha = vha->hw;
	struct req_que *req = NULL;

	if (!ql2xqfulltracking)
		return;

	req = vha->req;
	if (!req)
		return;
	if (req->max_q_depth <= sdev->queue_depth)
		return;

	if (sdev->ordered_tags)
		scsi_adjust_queue_depth(sdev, MSG_ORDERED_TAG,
		    sdev->queue_depth + 1);
	else
		scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG,
		    sdev->queue_depth + 1);

	fcport->last_ramp_up = jiffies;

	DEBUG2(qla_printk(KERN_INFO, ha,
	    "scsi(%ld:%d:%d:%d): Queue depth adjusted-up to %d.\n",
	    fcport->vha->host_no, sdev->channel, sdev->id, sdev->lun,
	    sdev->queue_depth));
}

static void
qla2x00_adjust_sdev_qdepth_down(struct scsi_device *sdev, void *data)
{
	fc_port_t *fcport = data;

	if (!scsi_track_queue_full(sdev, sdev->queue_depth - 1))
		return;

	DEBUG2(qla_printk(KERN_INFO, fcport->vha->hw,
	    "scsi(%ld:%d:%d:%d): Queue depth adjusted-down to %d.\n",
	    fcport->vha->host_no, sdev->channel, sdev->id, sdev->lun,
	    sdev->queue_depth));
}

static inline void
qla2x00_ramp_up_queue_depth(scsi_qla_host_t *vha, struct req_que *req,
								srb_t *sp)
{
	fc_port_t *fcport;
	struct scsi_device *sdev;

	if (!ql2xqfulltracking)
		return;

	sdev = sp->cmd->device;
	if (sdev->queue_depth >= req->max_q_depth)
		return;

	fcport = sp->fcport;
	if (time_before(jiffies,
	    fcport->last_ramp_up + ql2xqfullrampup * HZ))
		return;
	if (time_before(jiffies,
	    fcport->last_queue_full + ql2xqfullrampup * HZ))
		return;

	starget_for_each_device(sdev->sdev_target, fcport,
	    qla2x00_adjust_sdev_qdepth_up);
}

/**
 * qla2x00_process_completed_request() - Process a Fast Post response.
 * @ha: SCSI driver HA context
 * @index: SRB index
 */
static void
qla2x00_process_completed_request(struct scsi_qla_host *vha,
				struct req_que *req, uint32_t index)
{
	srb_t *sp;
	struct qla_hw_data *ha = vha->hw;

	/* Validate handle. */
	if (index >= MAX_OUTSTANDING_COMMANDS) {
		DEBUG2(printk("scsi(%ld): Invalid SCSI completion handle %d.\n",
		    vha->host_no, index));
		qla_printk(KERN_WARNING, ha,
		    "Invalid SCSI completion handle %d.\n", index);

		set_bit(ISP_ABORT_NEEDED, &vha->dpc_flags);
		return;
	}

	sp = req->outstanding_cmds[index];
	if (sp) {
		/* Free outstanding command slot. */
		req->outstanding_cmds[index] = NULL;

		/* Save ISP completion status */
		sp->cmd->result = DID_OK << 16;

		qla2x00_ramp_up_queue_depth(vha, req, sp);
		qla2x00_sp_compl(ha, sp);
	} else {
		DEBUG2(printk("scsi(%ld) Req:%d: Invalid ISP SCSI completion"
			" handle(%d)\n", vha->host_no, req->id, index));
		qla_printk(KERN_WARNING, ha,
		    "Invalid ISP SCSI completion handle\n");

		set_bit(ISP_ABORT_NEEDED, &vha->dpc_flags);
	}
}

static srb_t *
qla2x00_get_sp_from_handle(scsi_qla_host_t *vha, const char *func,
    struct req_que *req, void *iocb)
{
	struct qla_hw_data *ha = vha->hw;
	sts_entry_t *pkt = iocb;
	srb_t *sp = NULL;
	uint16_t index;

	index = LSW(pkt->handle);
	if (index >= MAX_OUTSTANDING_COMMANDS) {
		qla_printk(KERN_WARNING, ha,
		    "%s: Invalid completion handle (%x).\n", func, index);
		set_bit(ISP_ABORT_NEEDED, &vha->dpc_flags);
		goto done;
	}
	sp = req->outstanding_cmds[index];
	if (!sp) {
		qla_printk(KERN_WARNING, ha,
		    "%s: Invalid completion handle (%x) -- timed-out.\n", func,
		    index);
		return sp;
	}
	if (sp->handle != index) {
		qla_printk(KERN_WARNING, ha,
		    "%s: SRB handle (%x) mismatch %x.\n", func, sp->handle,
		    index);
		return NULL;
	}
	req->outstanding_cmds[index] = NULL;
done:
	return sp;
}

static void
qla2x00_mbx_iocb_entry(scsi_qla_host_t *vha, struct req_que *req,
    struct mbx_entry *mbx)
{
	const char func[] = "MBX-IOCB";
	const char *type;
	struct qla_hw_data *ha = vha->hw;
	fc_port_t *fcport;
	srb_t *sp;
	struct srb_logio *lio;
	uint16_t data[2];

	sp = qla2x00_get_sp_from_handle(vha, func, req, mbx);
	if (!sp)
		return;

	type = NULL;
	lio = sp->ctx;
	switch (lio->ctx.type) {
	case SRB_LOGIN_CMD:
		type = "login";
		break;
	case SRB_LOGOUT_CMD:
		type = "logout";
		break;
	default:
		qla_printk(KERN_WARNING, ha,
		    "%s: Unrecognized SRB: (%p) type=%d.\n", func, sp,
		    lio->ctx.type);
		return;
	}

	del_timer(&lio->ctx.timer);
	fcport = sp->fcport;

	data[0] = data[1] = 0;
	if (mbx->entry_status) {
		DEBUG2(printk(KERN_WARNING
		    "scsi(%ld:%x): Async-%s error entry - entry-status=%x "
		    "status=%x state-flag=%x status-flags=%x.\n",
		    fcport->vha->host_no, sp->handle, type,
		    mbx->entry_status, le16_to_cpu(mbx->status),
		    le16_to_cpu(mbx->state_flags),
		    le16_to_cpu(mbx->status_flags)));
		DEBUG2(qla2x00_dump_buffer((uint8_t *)mbx, sizeof(*mbx)));

		data[0] = MBS_COMMAND_ERROR;
		data[1] = lio->flags & SRB_LOGIN_RETRIED ?
		    QLA_LOGIO_LOGIN_RETRIED: 0;
		goto done_post_logio_done_work;
	}

	if (!mbx->status && le16_to_cpu(mbx->mb0) == MBS_COMMAND_COMPLETE) {
		DEBUG2(printk(KERN_DEBUG
		    "scsi(%ld:%x): Async-%s complete - mbx1=%x.\n",
		    fcport->vha->host_no, sp->handle, type,
		    le16_to_cpu(mbx->mb1)));

		data[0] = MBS_COMMAND_COMPLETE;
		if (lio->ctx.type == SRB_LOGIN_CMD && le16_to_cpu(mbx->mb1) & BIT_1)
			fcport->flags |= FCF_FCP2_DEVICE;

		goto done_post_logio_done_work;
	}

	data[0] = le16_to_cpu(mbx->mb0);
	switch (data[0]) {
	case MBS_PORT_ID_USED:
		data[1] = le16_to_cpu(mbx->mb1);
		break;
	case MBS_LOOP_ID_USED:
		break;
	default:
		data[0] = MBS_COMMAND_ERROR;
		data[1] = lio->flags & SRB_LOGIN_RETRIED ?
		    QLA_LOGIO_LOGIN_RETRIED: 0;
		break;
	}

	DEBUG2(printk(KERN_WARNING
	    "scsi(%ld:%x): Async-%s failed - status=%x mb0=%x mb1=%x mb2=%x "
	    "mb6=%x mb7=%x.\n",
	    fcport->vha->host_no, sp->handle, type, le16_to_cpu(mbx->status),
	    le16_to_cpu(mbx->mb0), le16_to_cpu(mbx->mb1),
	    le16_to_cpu(mbx->mb2), le16_to_cpu(mbx->mb6),
	    le16_to_cpu(mbx->mb7)));

done_post_logio_done_work:
	lio->ctx.type == SRB_LOGIN_CMD ?
	    qla2x00_post_async_login_done_work(fcport->vha, fcport, data):
	    qla2x00_post_async_logout_done_work(fcport->vha, fcport, data);

	lio->ctx.free(sp);
}

static void
qla24xx_logio_entry(scsi_qla_host_t *vha, struct req_que *req,
    struct logio_entry_24xx *logio)
{
	const char func[] = "LOGIO-IOCB";
	const char *type;
	struct qla_hw_data *ha = vha->hw;
	fc_port_t *fcport;
	srb_t *sp;
	struct srb_logio *lio;
	uint16_t data[2];
	uint32_t iop[2];

	sp = qla2x00_get_sp_from_handle(vha, func, req, logio);
	if (!sp)
		return;

	type = NULL;
	lio = sp->ctx;
	switch (lio->ctx.type) {
	case SRB_LOGIN_CMD:
		type = "login";
		break;
	case SRB_LOGOUT_CMD:
		type = "logout";
		break;
	default:
		qla_printk(KERN_WARNING, ha,
		    "%s: Unrecognized SRB: (%p) type=%d.\n", func, sp,
		    lio->ctx.type);
		return;
	}

	del_timer(&lio->ctx.timer);
	fcport = sp->fcport;

	data[0] = data[1] = 0;
	if (logio->entry_status) {
		DEBUG2(printk(KERN_WARNING
		    "scsi(%ld:%x): Async-%s error entry - entry-status=%x.\n",
		    fcport->vha->host_no, sp->handle, type,
		    logio->entry_status));
		DEBUG2(qla2x00_dump_buffer((uint8_t *)logio, sizeof(*logio)));

		data[0] = MBS_COMMAND_ERROR;
		data[1] = lio->flags & SRB_LOGIN_RETRIED ?
		    QLA_LOGIO_LOGIN_RETRIED: 0;
		goto done_post_logio_done_work;
	}

	if (le16_to_cpu(logio->comp_status) == CS_COMPLETE) {
		DEBUG2(printk(KERN_DEBUG
		    "scsi(%ld:%x): Async-%s complete - iop0=%x.\n",
		    fcport->vha->host_no, sp->handle, type,
		    le32_to_cpu(logio->io_parameter[0])));

		data[0] = MBS_COMMAND_COMPLETE;
		if (lio->ctx.type == SRB_LOGOUT_CMD)
			goto done_post_logio_done_work;

		iop[0] = le32_to_cpu(logio->io_parameter[0]);
		if (iop[0] & BIT_4) {
			fcport->port_type = FCT_TARGET;
			if (iop[0] & BIT_8)
				fcport->flags |= FCF_FCP2_DEVICE;
		}
		if (iop[0] & BIT_5)
			fcport->port_type = FCT_INITIATOR;
		if (logio->io_parameter[7] || logio->io_parameter[8])
			fcport->supported_classes |= FC_COS_CLASS2;
		if (logio->io_parameter[9] || logio->io_parameter[10])
			fcport->supported_classes |= FC_COS_CLASS3;

		goto done_post_logio_done_work;
	}

	iop[0] = le32_to_cpu(logio->io_parameter[0]);
	iop[1] = le32_to_cpu(logio->io_parameter[1]);
	switch (iop[0]) {
	case LSC_SCODE_PORTID_USED:
		data[0] = MBS_PORT_ID_USED;
		data[1] = LSW(iop[1]);
		break;
	case LSC_SCODE_NPORT_USED:
		data[0] = MBS_LOOP_ID_USED;
		break;
	case LSC_SCODE_CMD_FAILED:
		if ((iop[1] & 0xff) == 0x05) {
			data[0] = MBS_NOT_LOGGED_IN;
			break;
		}
		/* Fall through. */
	default:
		data[0] = MBS_COMMAND_ERROR;
		data[1] = lio->flags & SRB_LOGIN_RETRIED ?
		    QLA_LOGIO_LOGIN_RETRIED: 0;
		break;
	}

	DEBUG2(printk(KERN_WARNING
	    "scsi(%ld:%x): Async-%s failed - comp=%x iop0=%x iop1=%x.\n",
	    fcport->vha->host_no, sp->handle, type,
	    le16_to_cpu(logio->comp_status),
	    le32_to_cpu(logio->io_parameter[0]),
	    le32_to_cpu(logio->io_parameter[1])));

done_post_logio_done_work:
	lio->ctx.type == SRB_LOGIN_CMD ?
	    qla2x00_post_async_login_done_work(fcport->vha, fcport, data):
	    qla2x00_post_async_logout_done_work(fcport->vha, fcport, data);

	lio->ctx.free(sp);
}

/**
 * qla2x00_process_response_queue() - Process response queue entries.
 * @ha: SCSI driver HA context
 */
void
qla2x00_process_response_queue(struct rsp_que *rsp)
{
	struct scsi_qla_host *vha;
	struct qla_hw_data *ha = rsp->hw;
	struct device_reg_2xxx __iomem *reg = &ha->iobase->isp;
	sts_entry_t	*pkt;
	uint16_t        handle_cnt;
	uint16_t        cnt;

	vha = pci_get_drvdata(ha->pdev);

	if (!vha->flags.online)
		return;

	while (rsp->ring_ptr->signature != RESPONSE_PROCESSED) {
		pkt = (sts_entry_t *)rsp->ring_ptr;

		rsp->ring_index++;
		if (rsp->ring_index == rsp->length) {
			rsp->ring_index = 0;
			rsp->ring_ptr = rsp->ring;
		} else {
			rsp->ring_ptr++;
		}

		if (pkt->entry_status != 0) {
			DEBUG3(printk(KERN_INFO
			    "scsi(%ld): Process error entry.\n", vha->host_no));

			qla2x00_error_entry(vha, rsp, pkt);
			((response_t *)pkt)->signature = RESPONSE_PROCESSED;
			wmb();
			continue;
		}

		switch (pkt->entry_type) {
		case STATUS_TYPE:
			qla2x00_status_entry(vha, rsp, pkt);
			break;
		case STATUS_TYPE_21:
			handle_cnt = ((sts21_entry_t *)pkt)->handle_count;
			for (cnt = 0; cnt < handle_cnt; cnt++) {
				qla2x00_process_completed_request(vha, rsp->req,
				    ((sts21_entry_t *)pkt)->handle[cnt]);
			}
			break;
		case STATUS_TYPE_22:
			handle_cnt = ((sts22_entry_t *)pkt)->handle_count;
			for (cnt = 0; cnt < handle_cnt; cnt++) {
				qla2x00_process_completed_request(vha, rsp->req,
				    ((sts22_entry_t *)pkt)->handle[cnt]);
			}
			break;
		case STATUS_CONT_TYPE:
			qla2x00_status_cont_entry(rsp, (sts_cont_entry_t *)pkt);
			break;
		case MBX_IOCB_TYPE:
			qla2x00_mbx_iocb_entry(vha, rsp->req,
			    (struct mbx_entry *)pkt);
		default:
			/* Type Not Supported. */
			DEBUG4(printk(KERN_WARNING
			    "scsi(%ld): Received unknown response pkt type %x "
			    "entry status=%x.\n",
			    vha->host_no, pkt->entry_type, pkt->entry_status));
			break;
		}
		((response_t *)pkt)->signature = RESPONSE_PROCESSED;
		wmb();
	}

	/* Adjust ring index */
	WRT_REG_WORD(ISP_RSP_Q_OUT(ha, reg), rsp->ring_index);
}

static inline void
qla2x00_handle_sense(srb_t *sp, uint8_t *sense_data, uint32_t sense_len,
	struct rsp_que *rsp)
{
	struct scsi_cmnd *cp = sp->cmd;

	if (sense_len >= SCSI_SENSE_BUFFERSIZE)
		sense_len = SCSI_SENSE_BUFFERSIZE;

	sp->request_sense_length = sense_len;
	sp->request_sense_ptr = cp->sense_buffer;
	if (sp->request_sense_length > 32)
		sense_len = 32;

	memcpy(cp->sense_buffer, sense_data, sense_len);

	sp->request_sense_ptr += sense_len;
	sp->request_sense_length -= sense_len;
	if (sp->request_sense_length != 0)
		rsp->status_srb = sp;

	DEBUG5(printk("%s(): Check condition Sense data, scsi(%ld:%d:%d:%d) "
	    "cmd=%p pid=%ld\n", __func__, sp->fcport->vha->host_no,
	    cp->device->channel, cp->device->id, cp->device->lun, cp,
	    cp->serial_number));
	if (sense_len)
		DEBUG5(qla2x00_dump_buffer(cp->sense_buffer, sense_len));
}

/**
 * qla2x00_status_entry() - Process a Status IOCB entry.
 * @ha: SCSI driver HA context
 * @pkt: Entry pointer
 */
static void
qla2x00_status_entry(scsi_qla_host_t *vha, struct rsp_que *rsp, void *pkt)
{
	srb_t		*sp;
	fc_port_t	*fcport;
	struct scsi_cmnd *cp;
	sts_entry_t *sts;
	struct sts_entry_24xx *sts24;
	uint16_t	comp_status;
	uint16_t	scsi_status;
	uint8_t		lscsi_status;
	int32_t		resid;
	uint32_t	sense_len, rsp_info_len, resid_len, fw_resid_len;
	uint8_t		*rsp_info, *sense_data;
	struct qla_hw_data *ha = vha->hw;
	uint32_t handle;
	uint16_t que;
	struct req_que *req;

	sts = (sts_entry_t *) pkt;
	sts24 = (struct sts_entry_24xx *) pkt;
	if (IS_FWI2_CAPABLE(ha)) {
		comp_status = le16_to_cpu(sts24->comp_status);
		scsi_status = le16_to_cpu(sts24->scsi_status) & SS_MASK;
	} else {
		comp_status = le16_to_cpu(sts->comp_status);
		scsi_status = le16_to_cpu(sts->scsi_status) & SS_MASK;
	}
	handle = (uint32_t) LSW(sts->handle);
	que = MSW(sts->handle);
	req = ha->req_q_map[que];
	/* Fast path completion. */
	if (comp_status == CS_COMPLETE && scsi_status == 0) {
		qla2x00_process_completed_request(vha, req, handle);

		return;
	}

	/* Validate handle. */
	if (handle < MAX_OUTSTANDING_COMMANDS) {
		sp = req->outstanding_cmds[handle];
		req->outstanding_cmds[handle] = NULL;
	} else
		sp = NULL;

	if (sp == NULL) {
		DEBUG2(printk("scsi(%ld): Status Entry invalid handle.\n",
		    vha->host_no));
		qla_printk(KERN_WARNING, ha, "Status Entry invalid handle.\n");

		set_bit(ISP_ABORT_NEEDED, &vha->dpc_flags);
		qla2xxx_wake_dpc(vha);
		return;
	}
	cp = sp->cmd;
	if (cp == NULL) {
		DEBUG2(printk("scsi(%ld): Command already returned back to OS "
		    "pkt->handle=%d sp=%p.\n", vha->host_no, handle, sp));
		qla_printk(KERN_WARNING, ha,
		    "Command is NULL: already returned to OS (sp=%p)\n", sp);

		return;
	}

  	lscsi_status = scsi_status & STATUS_MASK;

	fcport = sp->fcport;

	sense_len = rsp_info_len = resid_len = fw_resid_len = 0;
	if (IS_FWI2_CAPABLE(ha)) {
		if (scsi_status & SS_SENSE_LEN_VALID)
			sense_len = le32_to_cpu(sts24->sense_len);
		if (scsi_status & SS_RESPONSE_INFO_LEN_VALID)
			rsp_info_len = le32_to_cpu(sts24->rsp_data_len);
		if (scsi_status & (SS_RESIDUAL_UNDER | SS_RESIDUAL_OVER))
			resid_len = le32_to_cpu(sts24->rsp_residual_count);
		if (comp_status == CS_DATA_UNDERRUN)
			fw_resid_len = le32_to_cpu(sts24->residual_len);
		rsp_info = sts24->data;
		sense_data = sts24->data;
		host_to_fcp_swap(sts24->data, sizeof(sts24->data));
	} else {
		if (scsi_status & SS_SENSE_LEN_VALID)
			sense_len = le16_to_cpu(sts->req_sense_length);
		if (scsi_status & SS_RESPONSE_INFO_LEN_VALID)
			rsp_info_len = le16_to_cpu(sts->rsp_info_len);
		resid_len = le32_to_cpu(sts->residual_length);
		rsp_info = sts->rsp_info;
		sense_data = sts->req_sense_data;
	}

	/* Check for any FCP transport errors. */
	if (scsi_status & SS_RESPONSE_INFO_LEN_VALID) {
		/* Sense data lies beyond any FCP RESPONSE data. */
		if (IS_FWI2_CAPABLE(ha))
			sense_data += rsp_info_len;
		if (rsp_info_len > 3 && rsp_info[3]) {
			DEBUG2(printk("scsi(%ld:%d:%d:%d) FCP I/O protocol "
			    "failure (%x/%02x%02x%02x%02x%02x%02x%02x%02x)..."
			    "retrying command\n", vha->host_no,
			    cp->device->channel, cp->device->id,
			    cp->device->lun, rsp_info_len, rsp_info[0],
			    rsp_info[1], rsp_info[2], rsp_info[3], rsp_info[4],
			    rsp_info[5], rsp_info[6], rsp_info[7]));

			cp->result = DID_BUS_BUSY << 16;
			qla2x00_sp_compl(ha, sp);
			return;
		}
	}

	/* Check for overrun. */
	if (IS_FWI2_CAPABLE(ha) && comp_status == CS_COMPLETE &&
	    scsi_status & SS_RESIDUAL_OVER)
		comp_status = CS_DATA_OVERRUN;

	/*
	 * Based on Host and scsi status generate status code for Linux
	 */
	switch (comp_status) {
	case CS_COMPLETE:
	case CS_QUEUE_FULL:
		if (scsi_status == 0) {
			cp->result = DID_OK << 16;
			break;
		}
		if (scsi_status & (SS_RESIDUAL_UNDER | SS_RESIDUAL_OVER)) {
			resid = resid_len;
			scsi_set_resid(cp, resid);

			if (!lscsi_status &&
			    ((unsigned)(scsi_bufflen(cp) - resid) <
			     cp->underflow)) {
				qla_printk(KERN_INFO, ha,
					   "scsi(%ld:%d:%d:%d): Mid-layer underflow "
					   "detected (%x of %x bytes)...returning "
					   "error status.\n", vha->host_no,
					   cp->device->channel, cp->device->id,
					   cp->device->lun, resid,
					   scsi_bufflen(cp));

				cp->result = DID_ERROR << 16;
				break;
			}
		}
		cp->result = DID_OK << 16 | lscsi_status;

		if (lscsi_status == SAM_STAT_TASK_SET_FULL) {
			DEBUG2(printk(KERN_INFO
			    "scsi(%ld): QUEUE FULL status detected "
			    "0x%x-0x%x.\n", vha->host_no, comp_status,
			    scsi_status));

			/* Adjust queue depth for all luns on the port. */
			if (!ql2xqfulltracking)
				break;
			fcport->last_queue_full = jiffies;
			starget_for_each_device(cp->device->sdev_target,
			    fcport, qla2x00_adjust_sdev_qdepth_down);
			break;
		}
		if (lscsi_status != SS_CHECK_CONDITION)
			break;

		memset(cp->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
		if (!(scsi_status & SS_SENSE_LEN_VALID))
			break;

		qla2x00_handle_sense(sp, sense_data, sense_len, rsp);
		break;

	case CS_DATA_UNDERRUN:
		DEBUG2(printk(KERN_INFO
		    "scsi(%ld:%d:%d) UNDERRUN status detected 0x%x-0x%x. "
		    "resid=0x%x fw_resid=0x%x cdb=0x%x os_underflow=0x%x\n",
		    vha->host_no, cp->device->id, cp->device->lun, comp_status,
		    scsi_status, resid_len, fw_resid_len, cp->cmnd[0],
		    cp->underflow));

		/* Use F/W calculated residual length. */
		resid = IS_FWI2_CAPABLE(ha) ? fw_resid_len : resid_len;
		scsi_set_resid(cp, resid);
		if (scsi_status & SS_RESIDUAL_UNDER) {
			if (IS_FWI2_CAPABLE(ha) && fw_resid_len != resid_len) {
				DEBUG2(printk(
				    "scsi(%ld:%d:%d:%d) Dropped frame(s) "
				    "detected (%x of %x bytes)...residual "
				    "length mismatch...retrying command.\n",
				    vha->host_no, cp->device->channel,
				    cp->device->id, cp->device->lun, resid,
				    scsi_bufflen(cp)));

				cp->result = DID_ERROR << 16 | lscsi_status;
				break;
			}

			if (!lscsi_status &&
			    ((unsigned)(scsi_bufflen(cp) - resid) <
			    cp->underflow)) {
				qla_printk(KERN_INFO, ha,
				    "scsi(%ld:%d:%d:%d): Mid-layer underflow "
				    "detected (%x of %x bytes)...returning "
				    "error status.\n", vha->host_no,
				    cp->device->channel, cp->device->id,
				    cp->device->lun, resid, scsi_bufflen(cp));

				cp->result = DID_ERROR << 16;
				break;
			}
		} else if (!lscsi_status) {
			DEBUG2(printk(
			    "scsi(%ld:%d:%d:%d) Dropped frame(s) detected "
			    "(%x of %x bytes)...firmware reported underrun..."
			    "retrying command.\n", vha->host_no,
			    cp->device->channel, cp->device->id,
			    cp->device->lun, resid, scsi_bufflen(cp)));

			cp->result = DID_ERROR << 16;
			break;
		}

		cp->result = DID_OK << 16 | lscsi_status;

		/*
		 * Check to see if SCSI Status is non zero. If so report SCSI
		 * Status.
		 */
		if (lscsi_status != 0) {
			if (lscsi_status == SAM_STAT_TASK_SET_FULL) {
				DEBUG2(printk(KERN_INFO
				    "scsi(%ld): QUEUE FULL status detected "
				    "0x%x-0x%x.\n", vha->host_no, comp_status,
				    scsi_status));

				/*
				 * Adjust queue depth for all luns on the
				 * port.
				 */
				if (!ql2xqfulltracking)
					break;
				fcport->last_queue_full = jiffies;
				starget_for_each_device(
				    cp->device->sdev_target, fcport,
				    qla2x00_adjust_sdev_qdepth_down);
				break;
			}
			if (lscsi_status != SS_CHECK_CONDITION)
				break;

			memset(cp->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
			if (!(scsi_status & SS_SENSE_LEN_VALID))
				break;

			qla2x00_handle_sense(sp, sense_data, sense_len, rsp);
		}
		break;

	case CS_DATA_OVERRUN:
		DEBUG2(printk(KERN_INFO
		    "scsi(%ld:%d:%d): OVERRUN status detected 0x%x-0x%x\n",
		    vha->host_no, cp->device->id, cp->device->lun, comp_status,
		    scsi_status));
		DEBUG2(printk(KERN_INFO
		    "CDB: 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x\n",
		    cp->cmnd[0], cp->cmnd[1], cp->cmnd[2], cp->cmnd[3],
		    cp->cmnd[4], cp->cmnd[5]));
		DEBUG2(printk(KERN_INFO
		    "PID=0x%lx req=0x%x xtra=0x%x -- returning DID_ERROR "
		    "status!\n",
		    cp->serial_number, scsi_bufflen(cp), resid_len));

		cp->result = DID_ERROR << 16;
		break;

	case CS_PORT_LOGGED_OUT:
	case CS_PORT_CONFIG_CHG:
	case CS_PORT_BUSY:
	case CS_INCOMPLETE:
	case CS_PORT_UNAVAILABLE:
		/*
		 * If the port is in Target Down state, return all IOs for this
		 * Target with DID_NO_CONNECT ELSE Queue the IOs in the
		 * retry_queue.
		 */
		DEBUG2(printk("scsi(%ld:%d:%d): status_entry: Port Down "
		    "pid=%ld, compl status=0x%x, port state=0x%x\n",
		    vha->host_no, cp->device->id, cp->device->lun,
		    cp->serial_number, comp_status,
		    atomic_read(&fcport->state)));

		/*
		 * We are going to have the fc class block the rport
		 * while we try to recover so instruct the mid layer
		 * to requeue until the class decides how to handle this.
		 */
		cp->result = DID_TRANSPORT_DISRUPTED << 16;
		if (atomic_read(&fcport->state) == FCS_ONLINE)
			qla2x00_mark_device_lost(fcport->vha, fcport, 1, 1);
		break;

	case CS_RESET:
		DEBUG2(printk(KERN_INFO
		    "scsi(%ld): RESET status detected 0x%x-0x%x.\n",
		    vha->host_no, comp_status, scsi_status));

		cp->result = DID_RESET << 16;
		break;

	case CS_ABORTED:
		/*
		 * hv2.19.12 - DID_ABORT does not retry the request if we
		 * aborted this request then abort otherwise it must be a
		 * reset.
		 */
		DEBUG2(printk(KERN_INFO
		    "scsi(%ld): ABORT status detected 0x%x-0x%x.\n",
		    vha->host_no, comp_status, scsi_status));

		cp->result = DID_RESET << 16;
		break;

	case CS_TIMEOUT:
		/*
		 * We are going to have the fc class block the rport
		 * while we try to recover so instruct the mid layer
		 * to requeue until the class decides how to handle this.
		 */
		cp->result = DID_TRANSPORT_DISRUPTED << 16;

		if (IS_FWI2_CAPABLE(ha)) {
			DEBUG2(printk(KERN_INFO
			    "scsi(%ld:%d:%d:%d): TIMEOUT status detected "
			    "0x%x-0x%x\n", vha->host_no, cp->device->channel,
			    cp->device->id, cp->device->lun, comp_status,
			    scsi_status));
			break;
		}
		DEBUG2(printk(KERN_INFO
		    "scsi(%ld:%d:%d:%d): TIMEOUT status detected 0x%x-0x%x "
		    "sflags=%x.\n", vha->host_no, cp->device->channel,
		    cp->device->id, cp->device->lun, comp_status, scsi_status,
		    le16_to_cpu(sts->status_flags)));

		/* Check to see if logout occurred. */
		if ((le16_to_cpu(sts->status_flags) & SF_LOGOUT_SENT))
			qla2x00_mark_device_lost(fcport->vha, fcport, 1, 1);
		break;

	default:
		DEBUG3(printk("scsi(%ld): Error detected (unknown status) "
		    "0x%x-0x%x.\n", vha->host_no, comp_status, scsi_status));
		qla_printk(KERN_INFO, ha,
		    "Unknown status detected 0x%x-0x%x.\n",
		    comp_status, scsi_status);

		cp->result = DID_ERROR << 16;
		break;
	}

	/* Place command on done queue. */
	if (rsp->status_srb == NULL)
		qla2x00_sp_compl(ha, sp);
}

/**
 * qla2x00_status_cont_entry() - Process a Status Continuations entry.
 * @ha: SCSI driver HA context
 * @pkt: Entry pointer
 *
 * Extended sense data.
 */
static void
qla2x00_status_cont_entry(struct rsp_que *rsp, sts_cont_entry_t *pkt)
{
	uint8_t		sense_sz = 0;
	struct qla_hw_data *ha = rsp->hw;
	srb_t		*sp = rsp->status_srb;
	struct scsi_cmnd *cp;

	if (sp != NULL && sp->request_sense_length != 0) {
		cp = sp->cmd;
		if (cp == NULL) {
			DEBUG2(printk("%s(): Cmd already returned back to OS "
			    "sp=%p.\n", __func__, sp));
			qla_printk(KERN_INFO, ha,
			    "cmd is NULL: already returned to OS (sp=%p)\n",
			    sp);

			rsp->status_srb = NULL;
			return;
		}

		if (sp->request_sense_length > sizeof(pkt->data)) {
			sense_sz = sizeof(pkt->data);
		} else {
			sense_sz = sp->request_sense_length;
		}

		/* Move sense data. */
		if (IS_FWI2_CAPABLE(ha))
			host_to_fcp_swap(pkt->data, sizeof(pkt->data));
		memcpy(sp->request_sense_ptr, pkt->data, sense_sz);
		DEBUG5(qla2x00_dump_buffer(sp->request_sense_ptr, sense_sz));

		sp->request_sense_ptr += sense_sz;
		sp->request_sense_length -= sense_sz;

		/* Place command on done queue. */
		if (sp->request_sense_length == 0) {
			rsp->status_srb = NULL;
			qla2x00_sp_compl(ha, sp);
		}
	}
}

/**
 * qla2x00_error_entry() - Process an error entry.
 * @ha: SCSI driver HA context
 * @pkt: Entry pointer
 */
static void
qla2x00_error_entry(scsi_qla_host_t *vha, struct rsp_que *rsp, sts_entry_t *pkt)
{
	srb_t *sp;
	struct qla_hw_data *ha = vha->hw;
	uint32_t handle = LSW(pkt->handle);
	uint16_t que = MSW(pkt->handle);
	struct req_que *req = ha->req_q_map[que];
#if defined(QL_DEBUG_LEVEL_2)
	if (pkt->entry_status & RF_INV_E_ORDER)
		qla_printk(KERN_ERR, ha, "%s: Invalid Entry Order\n", __func__);
	else if (pkt->entry_status & RF_INV_E_COUNT)
		qla_printk(KERN_ERR, ha, "%s: Invalid Entry Count\n", __func__);
	else if (pkt->entry_status & RF_INV_E_PARAM)
		qla_printk(KERN_ERR, ha,
		    "%s: Invalid Entry Parameter\n", __func__);
	else if (pkt->entry_status & RF_INV_E_TYPE)
		qla_printk(KERN_ERR, ha, "%s: Invalid Entry Type\n", __func__);
	else if (pkt->entry_status & RF_BUSY)
		qla_printk(KERN_ERR, ha, "%s: Busy\n", __func__);
	else
		qla_printk(KERN_ERR, ha, "%s: UNKNOWN flag error\n", __func__);
#endif

	/* Validate handle. */
	if (handle < MAX_OUTSTANDING_COMMANDS)
		sp = req->outstanding_cmds[handle];
	else
		sp = NULL;

	if (sp) {
		/* Free outstanding command slot. */
		req->outstanding_cmds[handle] = NULL;

		/* Bad payload or header */
		if (pkt->entry_status &
		    (RF_INV_E_ORDER | RF_INV_E_COUNT |
		     RF_INV_E_PARAM | RF_INV_E_TYPE)) {
			sp->cmd->result = DID_ERROR << 16;
		} else if (pkt->entry_status & RF_BUSY) {
			sp->cmd->result = DID_BUS_BUSY << 16;
		} else {
			sp->cmd->result = DID_ERROR << 16;
		}
		qla2x00_sp_compl(ha, sp);

	} else if (pkt->entry_type == COMMAND_A64_TYPE || pkt->entry_type ==
	    COMMAND_TYPE || pkt->entry_type == COMMAND_TYPE_7) {
		DEBUG2(printk("scsi(%ld): Error entry - invalid handle\n",
		    vha->host_no));
		qla_printk(KERN_WARNING, ha,
		    "Error entry - invalid handle\n");

		set_bit(ISP_ABORT_NEEDED, &vha->dpc_flags);
		qla2xxx_wake_dpc(vha);
	}
}

/**
 * qla24xx_mbx_completion() - Process mailbox command completions.
 * @ha: SCSI driver HA context
 * @mb0: Mailbox0 register
 */
static void
qla24xx_mbx_completion(scsi_qla_host_t *vha, uint16_t mb0)
{
	uint16_t	cnt;
	uint16_t __iomem *wptr;
	struct qla_hw_data *ha = vha->hw;
	struct device_reg_24xx __iomem *reg = &ha->iobase->isp24;

	/* Load return mailbox registers. */
	ha->flags.mbox_int = 1;
	ha->mailbox_out[0] = mb0;
	wptr = (uint16_t __iomem *)&reg->mailbox1;

	for (cnt = 1; cnt < ha->mbx_count; cnt++) {
		ha->mailbox_out[cnt] = RD_REG_WORD(wptr);
		wptr++;
	}

	if (ha->mcp) {
		DEBUG3(printk("%s(%ld): Got mailbox completion. cmd=%x.\n",
		    __func__, vha->host_no, ha->mcp->mb[0]));
	} else {
		DEBUG2_3(printk("%s(%ld): MBX pointer ERROR!\n",
		    __func__, vha->host_no));
	}
}

/**
 * qla24xx_process_response_queue() - Process response queue entries.
 * @ha: SCSI driver HA context
 */
void qla24xx_process_response_queue(struct scsi_qla_host *vha,
	struct rsp_que *rsp)
{
	struct sts_entry_24xx *pkt;

	if (!vha->flags.online)
		return;

	while (rsp->ring_ptr->signature != RESPONSE_PROCESSED) {
		pkt = (struct sts_entry_24xx *)rsp->ring_ptr;

		rsp->ring_index++;
		if (rsp->ring_index == rsp->length) {
			rsp->ring_index = 0;
			rsp->ring_ptr = rsp->ring;
		} else {
			rsp->ring_ptr++;
		}

		if (pkt->entry_status != 0) {
			DEBUG3(printk(KERN_INFO
			    "scsi(%ld): Process error entry.\n", vha->host_no));

			qla2x00_error_entry(vha, rsp, (sts_entry_t *) pkt);
			((response_t *)pkt)->signature = RESPONSE_PROCESSED;
			wmb();
			continue;
		}

		switch (pkt->entry_type) {
		case STATUS_TYPE:
			qla2x00_status_entry(vha, rsp, pkt);
			break;
		case STATUS_CONT_TYPE:
			qla2x00_status_cont_entry(rsp, (sts_cont_entry_t *)pkt);
			break;
		case VP_RPT_ID_IOCB_TYPE:
			qla24xx_report_id_acquisition(vha,
			    (struct vp_rpt_id_entry_24xx *)pkt);
			break;
		case LOGINOUT_PORT_IOCB_TYPE:
			qla24xx_logio_entry(vha, rsp->req,
			    (struct logio_entry_24xx *)pkt);
			break;
		default:
			/* Type Not Supported. */
			DEBUG4(printk(KERN_WARNING
			    "scsi(%ld): Received unknown response pkt type %x "
			    "entry status=%x.\n",
			    vha->host_no, pkt->entry_type, pkt->entry_status));
			break;
		}
		((response_t *)pkt)->signature = RESPONSE_PROCESSED;
		wmb();
	}

	/* Adjust ring index */
	WRT_REG_DWORD(rsp->rsp_q_out, rsp->ring_index);
}

static void
qla2xxx_check_risc_status(scsi_qla_host_t *vha)
{
	int rval;
	uint32_t cnt;
	struct qla_hw_data *ha = vha->hw;
	struct device_reg_24xx __iomem *reg = &ha->iobase->isp24;

	if (!IS_QLA25XX(ha) && !IS_QLA81XX(ha))
		return;

	rval = QLA_SUCCESS;
	WRT_REG_DWORD(&reg->iobase_addr, 0x7C00);
	RD_REG_DWORD(&reg->iobase_addr);
	WRT_REG_DWORD(&reg->iobase_window, 0x0001);
	for (cnt = 10000; (RD_REG_DWORD(&reg->iobase_window) & BIT_0) == 0 &&
	    rval == QLA_SUCCESS; cnt--) {
		if (cnt) {
			WRT_REG_DWORD(&reg->iobase_window, 0x0001);
			udelay(10);
		} else
			rval = QLA_FUNCTION_TIMEOUT;
	}
	if (rval == QLA_SUCCESS)
		goto next_test;

	WRT_REG_DWORD(&reg->iobase_window, 0x0003);
	for (cnt = 100; (RD_REG_DWORD(&reg->iobase_window) & BIT_0) == 0 &&
	    rval == QLA_SUCCESS; cnt--) {
		if (cnt) {
			WRT_REG_DWORD(&reg->iobase_window, 0x0003);
			udelay(10);
		} else
			rval = QLA_FUNCTION_TIMEOUT;
	}
	if (rval != QLA_SUCCESS)
		goto done;

next_test:
	if (RD_REG_DWORD(&reg->iobase_c8) & BIT_3)
		qla_printk(KERN_INFO, ha, "Additional code -- 0x55AA.\n");

done:
	WRT_REG_DWORD(&reg->iobase_window, 0x0000);
	RD_REG_DWORD(&reg->iobase_window);
}

/**
 * qla24xx_intr_handler() - Process interrupts for the ISP23xx and ISP63xx.
 * @irq:
 * @dev_id: SCSI driver HA context
 *
 * Called by system whenever the host adapter generates an interrupt.
 *
 * Returns handled flag.
 */
irqreturn_t
qla24xx_intr_handler(int irq, void *dev_id)
{
	scsi_qla_host_t	*vha;
	struct qla_hw_data *ha;
	struct device_reg_24xx __iomem *reg;
	int		status;
	unsigned long	iter;
	uint32_t	stat;
	uint32_t	hccr;
	uint16_t	mb[4];
	struct rsp_que *rsp;
	unsigned long	flags;

	rsp = (struct rsp_que *) dev_id;
	if (!rsp) {
		printk(KERN_INFO
		    "%s(): NULL response queue pointer\n", __func__);
		return IRQ_NONE;
	}

	ha = rsp->hw;
	reg = &ha->iobase->isp24;
	status = 0;

	spin_lock_irqsave(&ha->hardware_lock, flags);
	vha = pci_get_drvdata(ha->pdev);
	for (iter = 50; iter--; ) {
		stat = RD_REG_DWORD(&reg->host_status);
		if (stat & HSRX_RISC_PAUSED) {
			if (pci_channel_offline(ha->pdev))
				break;

			hccr = RD_REG_DWORD(&reg->hccr);

			qla_printk(KERN_INFO, ha, "RISC paused -- HCCR=%x, "
			    "Dumping firmware!\n", hccr);

			qla2xxx_check_risc_status(vha);

			ha->isp_ops->fw_dump(vha, 1);
			set_bit(ISP_ABORT_NEEDED, &vha->dpc_flags);
			break;
		} else if ((stat & HSRX_RISC_INT) == 0)
			break;

		switch (stat & 0xff) {
		case 0x1:
		case 0x2:
		case 0x10:
		case 0x11:
			qla24xx_mbx_completion(vha, MSW(stat));
			status |= MBX_INTERRUPT;

			break;
		case 0x12:
			mb[0] = MSW(stat);
			mb[1] = RD_REG_WORD(&reg->mailbox1);
			mb[2] = RD_REG_WORD(&reg->mailbox2);
			mb[3] = RD_REG_WORD(&reg->mailbox3);
			qla2x00_async_event(vha, rsp, mb);
			break;
		case 0x13:
		case 0x14:
			qla24xx_process_response_queue(vha, rsp);
			break;
		default:
			DEBUG2(printk("scsi(%ld): Unrecognized interrupt type "
			    "(%d).\n",
			    vha->host_no, stat & 0xff));
			break;
		}
		WRT_REG_DWORD(&reg->hccr, HCCRX_CLR_RISC_INT);
		RD_REG_DWORD_RELAXED(&reg->hccr);
	}
	spin_unlock_irqrestore(&ha->hardware_lock, flags);

	if (test_bit(MBX_INTR_WAIT, &ha->mbx_cmd_flags) &&
	    (status & MBX_INTERRUPT) && ha->flags.mbox_int) {
		set_bit(MBX_INTERRUPT, &ha->mbx_cmd_flags);
		complete(&ha->mbx_intr_comp);
	}

	return IRQ_HANDLED;
}

static irqreturn_t
qla24xx_msix_rsp_q(int irq, void *dev_id)
{
	struct qla_hw_data *ha;
	struct rsp_que *rsp;
	struct device_reg_24xx __iomem *reg;
	struct scsi_qla_host *vha;

	rsp = (struct rsp_que *) dev_id;
	if (!rsp) {
		printk(KERN_INFO
		"%s(): NULL response queue pointer\n", __func__);
		return IRQ_NONE;
	}
	ha = rsp->hw;
	reg = &ha->iobase->isp24;

	spin_lock_irq(&ha->hardware_lock);

	vha = qla25xx_get_host(rsp);
	qla24xx_process_response_queue(vha, rsp);
	if (!ha->mqenable) {
		WRT_REG_DWORD(&reg->hccr, HCCRX_CLR_RISC_INT);
		RD_REG_DWORD_RELAXED(&reg->hccr);
	}
	spin_unlock_irq(&ha->hardware_lock);

	return IRQ_HANDLED;
}

static irqreturn_t
qla25xx_msix_rsp_q(int irq, void *dev_id)
{
	struct qla_hw_data *ha;
	struct rsp_que *rsp;

	rsp = (struct rsp_que *) dev_id;
	if (!rsp) {
		printk(KERN_INFO
			"%s(): NULL response queue pointer\n", __func__);
		return IRQ_NONE;
	}
	ha = rsp->hw;

	queue_work_on((int) (rsp->id - 1), ha->wq, &rsp->q_work);

	return IRQ_HANDLED;
}

static irqreturn_t
qla24xx_msix_default(int irq, void *dev_id)
{
	scsi_qla_host_t	*vha;
	struct qla_hw_data *ha;
	struct rsp_que *rsp;
	struct device_reg_24xx __iomem *reg;
	int		status;
	uint32_t	stat;
	uint32_t	hccr;
	uint16_t	mb[4];

	rsp = (struct rsp_que *) dev_id;
	if (!rsp) {
		DEBUG(printk(
		"%s(): NULL response queue pointer\n", __func__));
		return IRQ_NONE;
	}
	ha = rsp->hw;
	reg = &ha->iobase->isp24;
	status = 0;

	spin_lock_irq(&ha->hardware_lock);
	vha = pci_get_drvdata(ha->pdev);
	do {
		stat = RD_REG_DWORD(&reg->host_status);
		if (stat & HSRX_RISC_PAUSED) {
			if (pci_channel_offline(ha->pdev))
				break;

			hccr = RD_REG_DWORD(&reg->hccr);

			qla_printk(KERN_INFO, ha, "RISC paused -- HCCR=%x, "
			    "Dumping firmware!\n", hccr);

			qla2xxx_check_risc_status(vha);

			ha->isp_ops->fw_dump(vha, 1);
			set_bit(ISP_ABORT_NEEDED, &vha->dpc_flags);
			break;
		} else if ((stat & HSRX_RISC_INT) == 0)
			break;

		switch (stat & 0xff) {
		case 0x1:
		case 0x2:
		case 0x10:
		case 0x11:
			qla24xx_mbx_completion(vha, MSW(stat));
			status |= MBX_INTERRUPT;

			break;
		case 0x12:
			mb[0] = MSW(stat);
			mb[1] = RD_REG_WORD(&reg->mailbox1);
			mb[2] = RD_REG_WORD(&reg->mailbox2);
			mb[3] = RD_REG_WORD(&reg->mailbox3);
			qla2x00_async_event(vha, rsp, mb);
			break;
		case 0x13:
		case 0x14:
			qla24xx_process_response_queue(vha, rsp);
			break;
		default:
			DEBUG2(printk("scsi(%ld): Unrecognized interrupt type "
			    "(%d).\n",
			    vha->host_no, stat & 0xff));
			break;
		}
		WRT_REG_DWORD(&reg->hccr, HCCRX_CLR_RISC_INT);
	} while (0);
	spin_unlock_irq(&ha->hardware_lock);

	if (test_bit(MBX_INTR_WAIT, &ha->mbx_cmd_flags) &&
	    (status & MBX_INTERRUPT) && ha->flags.mbox_int) {
		set_bit(MBX_INTERRUPT, &ha->mbx_cmd_flags);
		complete(&ha->mbx_intr_comp);
	}

	return IRQ_HANDLED;
}

/* Interrupt handling helpers. */

struct qla_init_msix_entry {
	const char *name;
	irq_handler_t handler;
};

static struct qla_init_msix_entry msix_entries[3] = {
	{ "qla2xxx (default)", qla24xx_msix_default },
	{ "qla2xxx (rsp_q)", qla24xx_msix_rsp_q },
	{ "qla2xxx (multiq)", qla25xx_msix_rsp_q },
};

static void
qla24xx_disable_msix(struct qla_hw_data *ha)
{
	int i;
	struct qla_msix_entry *qentry;

	for (i = 0; i < ha->msix_count; i++) {
		qentry = &ha->msix_entries[i];
		if (qentry->have_irq)
			free_irq(qentry->vector, qentry->rsp);
	}
	pci_disable_msix(ha->pdev);
	kfree(ha->msix_entries);
	ha->msix_entries = NULL;
	ha->flags.msix_enabled = 0;
}

static int
qla24xx_enable_msix(struct qla_hw_data *ha, struct rsp_que *rsp)
{
#define MIN_MSIX_COUNT	2
	int i, ret;
	struct msix_entry *entries;
	struct qla_msix_entry *qentry;

	entries = kzalloc(sizeof(struct msix_entry) * ha->msix_count,
					GFP_KERNEL);
	if (!entries)
		return -ENOMEM;

	for (i = 0; i < ha->msix_count; i++)
		entries[i].entry = i;

	ret = pci_enable_msix(ha->pdev, entries, ha->msix_count);
	if (ret) {
		if (ret < MIN_MSIX_COUNT)
			goto msix_failed;

		qla_printk(KERN_WARNING, ha,
			"MSI-X: Failed to enable support -- %d/%d\n"
			" Retry with %d vectors\n", ha->msix_count, ret, ret);
		ha->msix_count = ret;
		ret = pci_enable_msix(ha->pdev, entries, ha->msix_count);
		if (ret) {
msix_failed:
			qla_printk(KERN_WARNING, ha, "MSI-X: Failed to enable"
				" support, giving up -- %d/%d\n",
				ha->msix_count, ret);
			goto msix_out;
		}
		ha->max_rsp_queues = ha->msix_count - 1;
	}
	ha->msix_entries = kzalloc(sizeof(struct qla_msix_entry) *
				ha->msix_count, GFP_KERNEL);
	if (!ha->msix_entries) {
		ret = -ENOMEM;
		goto msix_out;
	}
	ha->flags.msix_enabled = 1;

	for (i = 0; i < ha->msix_count; i++) {
		qentry = &ha->msix_entries[i];
		qentry->vector = entries[i].vector;
		qentry->entry = entries[i].entry;
		qentry->have_irq = 0;
		qentry->rsp = NULL;
	}

	/* Enable MSI-X vectors for the base queue */
	for (i = 0; i < 2; i++) {
		qentry = &ha->msix_entries[i];
		ret = request_irq(qentry->vector, msix_entries[i].handler,
					0, msix_entries[i].name, rsp);
		if (ret) {
			qla_printk(KERN_WARNING, ha,
			"MSI-X: Unable to register handler -- %x/%d.\n",
			qentry->vector, ret);
			qla24xx_disable_msix(ha);
			ha->mqenable = 0;
			goto msix_out;
		}
		qentry->have_irq = 1;
		qentry->rsp = rsp;
		rsp->msix = qentry;
	}

	/* Enable MSI-X vector for response queue update for queue 0 */
	if (ha->mqiobase &&  (ha->max_rsp_queues > 1 || ha->max_req_queues > 1))
		ha->mqenable = 1;

msix_out:
	kfree(entries);
	return ret;
}

int
qla2x00_request_irqs(struct qla_hw_data *ha, struct rsp_que *rsp)
{
	int ret;
	device_reg_t __iomem *reg = ha->iobase;

	/* If possible, enable MSI-X. */
	if (!IS_QLA2432(ha) && !IS_QLA2532(ha) &&
	    !IS_QLA8432(ha) && !IS_QLA8001(ha))
		goto skip_msix;

	if (IS_QLA2432(ha) && (ha->pdev->revision < QLA_MSIX_CHIP_REV_24XX ||
		!QLA_MSIX_FW_MODE_1(ha->fw_attributes))) {
		DEBUG2(qla_printk(KERN_WARNING, ha,
		"MSI-X: Unsupported ISP2432 (0x%X, 0x%X).\n",
			ha->pdev->revision, ha->fw_attributes));

		goto skip_msix;
	}

	if (ha->pdev->subsystem_vendor == PCI_VENDOR_ID_HP &&
	    (ha->pdev->subsystem_device == 0x7040 ||
		ha->pdev->subsystem_device == 0x7041 ||
		ha->pdev->subsystem_device == 0x1705)) {
		DEBUG2(qla_printk(KERN_WARNING, ha,
		    "MSI-X: Unsupported ISP2432 SSVID/SSDID (0x%X, 0x%X).\n",
		    ha->pdev->subsystem_vendor,
		    ha->pdev->subsystem_device));

		goto skip_msi;
	}

	ret = qla24xx_enable_msix(ha, rsp);
	if (!ret) {
		DEBUG2(qla_printk(KERN_INFO, ha,
		    "MSI-X: Enabled (0x%X, 0x%X).\n", ha->chip_revision,
		    ha->fw_attributes));
		goto clear_risc_ints;
	}
	qla_printk(KERN_WARNING, ha,
	    "MSI-X: Falling back-to INTa mode -- %d.\n", ret);
skip_msix:

	if (!IS_QLA24XX(ha) && !IS_QLA2532(ha) && !IS_QLA8432(ha) &&
	    !IS_QLA8001(ha))
		goto skip_msi;

	ret = pci_enable_msi(ha->pdev);
	if (!ret) {
		DEBUG2(qla_printk(KERN_INFO, ha, "MSI: Enabled.\n"));
		ha->flags.msi_enabled = 1;
	}
skip_msi:

	ret = request_irq(ha->pdev->irq, ha->isp_ops->intr_handler,
	    IRQF_SHARED, QLA2XXX_DRIVER_NAME, rsp);
	if (ret) {
		qla_printk(KERN_WARNING, ha,
		    "Failed to reserve interrupt %d already in use.\n",
		    ha->pdev->irq);
		goto fail;
	}
	ha->flags.inta_enabled = 1;
clear_risc_ints:

	/*
	 * FIXME: Noted that 8014s were being dropped during NK testing.
	 * Timing deltas during MSI-X/INTa transitions?
	 */
	if (IS_QLA81XX(ha))
		goto fail;
	spin_lock_irq(&ha->hardware_lock);
	if (IS_FWI2_CAPABLE(ha)) {
		WRT_REG_DWORD(&reg->isp24.hccr, HCCRX_CLR_HOST_INT);
		WRT_REG_DWORD(&reg->isp24.hccr, HCCRX_CLR_RISC_INT);
	} else {
		WRT_REG_WORD(&reg->isp.semaphore, 0);
		WRT_REG_WORD(&reg->isp.hccr, HCCR_CLR_RISC_INT);
		WRT_REG_WORD(&reg->isp.hccr, HCCR_CLR_HOST_INT);
	}
	spin_unlock_irq(&ha->hardware_lock);

fail:
	return ret;
}

void
qla2x00_free_irqs(scsi_qla_host_t *vha)
{
	struct qla_hw_data *ha = vha->hw;
	struct rsp_que *rsp = ha->rsp_q_map[0];

	if (ha->flags.msix_enabled)
		qla24xx_disable_msix(ha);
	else if (ha->flags.inta_enabled) {
		free_irq(ha->pdev->irq, rsp);
		pci_disable_msi(ha->pdev);
	}
}


int qla25xx_request_irq(struct rsp_que *rsp)
{
	struct qla_hw_data *ha = rsp->hw;
	struct qla_init_msix_entry *intr = &msix_entries[2];
	struct qla_msix_entry *msix = rsp->msix;
	int ret;

	ret = request_irq(msix->vector, intr->handler, 0, intr->name, rsp);
	if (ret) {
		qla_printk(KERN_WARNING, ha,
			"MSI-X: Unable to register handler -- %x/%d.\n",
			msix->vector, ret);
		return ret;
	}
	msix->have_irq = 1;
	msix->rsp = rsp;
	return ret;
}

struct scsi_qla_host *
qla25xx_get_host(struct rsp_que *rsp)
{
	srb_t *sp;
	struct qla_hw_data *ha = rsp->hw;
	struct scsi_qla_host *vha = NULL;
	struct sts_entry_24xx *pkt;
	struct req_que *req;
	uint16_t que;
	uint32_t handle;

	pkt = (struct sts_entry_24xx *) rsp->ring_ptr;
	que = MSW(pkt->handle);
	handle = (uint32_t) LSW(pkt->handle);
	req = ha->req_q_map[que];
	if (handle < MAX_OUTSTANDING_COMMANDS) {
		sp = req->outstanding_cmds[handle];
		if (sp)
			return  sp->fcport->vha;
		else
			goto base_que;
	}
base_que:
	vha = pci_get_drvdata(ha->pdev);
	return vha;
}