Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

[deliverable/linux.git] / drivers / scsi / lpfc / lpfc_sli.c

/*******************************************************************
 * This file is part of the Emulex Linux Device Driver for         *
 * Fibre Channel Host Bus Adapters.                                *
 * Copyright (C) 2004-2008 Emulex.  All rights reserved.           *
 * EMULEX and SLI are trademarks of Emulex.                        *
 * www.emulex.com                                                  *
 * Portions Copyright (C) 2004-2005 Christoph Hellwig              *
 *                                                                 *
 * This program is free software; you can redistribute it and/or   *
 * modify it under the terms of version 2 of the GNU General       *
 * Public License as published by the Free Software Foundation.    *
 * This program is distributed in the hope that it will be useful. *
 * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND          *
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,  *
 * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE      *
 * DISCLAIMED, EXCEPT TO THE EXTENT THAT SUCH DISCLAIMERS ARE HELD *
 * TO BE LEGALLY INVALID.  See the GNU General Public License for  *
 * more details, a copy of which can be found in the file COPYING  *
 * included with this package.                                     *
 *******************************************************************/

#include <linux/blkdev.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/delay.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_transport_fc.h>

#include "lpfc_hw.h"
#include "lpfc_sli.h"
#include "lpfc_nl.h"
#include "lpfc_disc.h"
#include "lpfc_scsi.h"
#include "lpfc.h"
#include "lpfc_crtn.h"
#include "lpfc_logmsg.h"
#include "lpfc_compat.h"
#include "lpfc_debugfs.h"

/*
 * Define macro to log: Mailbox command x%x cannot issue Data
 * This allows multiple uses of lpfc_msgBlk0311
 * w/o perturbing log msg utility.
 */
#define LOG_MBOX_CANNOT_ISSUE_DATA(phba, pmbox, psli, flag) \
                        lpfc_printf_log(phba, \
                                KERN_INFO, \
                                LOG_MBOX | LOG_SLI, \
                                "(%d):0311 Mailbox command x%x cannot " \
                                "issue Data: x%x x%x x%x\n", \
                                pmbox->vport ? pmbox->vport->vpi : 0, \
                                pmbox->mb.mbxCommand,           \
                                phba->pport->port_state,        \
                                psli->sli_flag, \
                                flag)


/* There are only four IOCB completion types. */
typedef enum _lpfc_iocb_type {
        LPFC_UNKNOWN_IOCB,
        LPFC_UNSOL_IOCB,
        LPFC_SOL_IOCB,
        LPFC_ABORT_IOCB
} lpfc_iocb_type;

/**
 * lpfc_cmd_iocb - Get next command iocb entry in the ring
 * @phba: Pointer to HBA context object.
 * @pring: Pointer to driver SLI ring object.
 *
 * This function returns pointer to next command iocb entry
 * in the command ring. The caller must hold hbalock to prevent
 * other threads consume the next command iocb.
 * SLI-2/SLI-3 provide different sized iocbs.
 **/
static inline IOCB_t *
lpfc_cmd_iocb(struct lpfc_hba *phba, struct lpfc_sli_ring *pring)
{
        return (IOCB_t *) (((char *) pring->cmdringaddr) +
                           pring->cmdidx * phba->iocb_cmd_size);
}

/**
 * lpfc_resp_iocb - Get next response iocb entry in the ring
 * @phba: Pointer to HBA context object.
 * @pring: Pointer to driver SLI ring object.
 *
 * This function returns pointer to next response iocb entry
 * in the response ring. The caller must hold hbalock to make sure
 * that no other thread consume the next response iocb.
 * SLI-2/SLI-3 provide different sized iocbs.
 **/
static inline IOCB_t *
lpfc_resp_iocb(struct lpfc_hba *phba, struct lpfc_sli_ring *pring)
{
        return (IOCB_t *) (((char *) pring->rspringaddr) +
                           pring->rspidx * phba->iocb_rsp_size);
}

/**
 * __lpfc_sli_get_iocbq - Allocates an iocb object from iocb pool
 * @phba: Pointer to HBA context object.
 *
 * This function is called with hbalock held. This function
 * allocates a new driver iocb object from the iocb pool. If the
 * allocation is successful, it returns pointer to the newly
 * allocated iocb object else it returns NULL.
 **/
static struct lpfc_iocbq *
__lpfc_sli_get_iocbq(struct lpfc_hba *phba)
{
        struct list_head *lpfc_iocb_list = &phba->lpfc_iocb_list;
        struct lpfc_iocbq * iocbq = NULL;

        list_remove_head(lpfc_iocb_list, iocbq, struct lpfc_iocbq, list);
        return iocbq;
}

/**
 * lpfc_sli_get_iocbq - Allocates an iocb object from iocb pool
 * @phba: Pointer to HBA context object.
 *
 * This function is called with no lock held. This function
 * allocates a new driver iocb object from the iocb pool. If the
 * allocation is successful, it returns pointer to the newly
 * allocated iocb object else it returns NULL.
 **/
struct lpfc_iocbq *
lpfc_sli_get_iocbq(struct lpfc_hba *phba)
{
        struct lpfc_iocbq * iocbq = NULL;
        unsigned long iflags;

        spin_lock_irqsave(&phba->hbalock, iflags);
        iocbq = __lpfc_sli_get_iocbq(phba);
        spin_unlock_irqrestore(&phba->hbalock, iflags);
        return iocbq;
}

/**
 * __lpfc_sli_release_iocbq - Release iocb to the iocb pool
 * @phba: Pointer to HBA context object.
 * @iocbq: Pointer to driver iocb object.
 *
 * This function is called with hbalock held to release driver
 * iocb object to the iocb pool. The iotag in the iocb object
 * does not change for each use of the iocb object. This function
 * clears all other fields of the iocb object when it is freed.
 **/
static void
__lpfc_sli_release_iocbq(struct lpfc_hba *phba, struct lpfc_iocbq *iocbq)
{
        size_t start_clean = offsetof(struct lpfc_iocbq, iocb);

        /*
         * Clean all volatile data fields, preserve iotag and node struct.
         */
        memset((char*)iocbq + start_clean, 0, sizeof(*iocbq) - start_clean);
        list_add_tail(&iocbq->list, &phba->lpfc_iocb_list);
}

/**
 * lpfc_sli_release_iocbq - Release iocb to the iocb pool
 * @phba: Pointer to HBA context object.
 * @iocbq: Pointer to driver iocb object.
 *
 * This function is called with no lock held to release the iocb to
 * iocb pool.
 **/
void
lpfc_sli_release_iocbq(struct lpfc_hba *phba, struct lpfc_iocbq *iocbq)
{
        unsigned long iflags;

        /*
         * Clean all volatile data fields, preserve iotag and node struct.
         */
        spin_lock_irqsave(&phba->hbalock, iflags);
        __lpfc_sli_release_iocbq(phba, iocbq);
        spin_unlock_irqrestore(&phba->hbalock, iflags);
}

/**
 * lpfc_sli_cancel_iocbs - Cancel all iocbs from a list.
 * @phba: Pointer to HBA context object.
 * @iocblist: List of IOCBs.
 * @ulpstatus: ULP status in IOCB command field.
 * @ulpWord4: ULP word-4 in IOCB command field.
 *
 * This function is called with a list of IOCBs to cancel. It cancels the IOCB
 * on the list by invoking the complete callback function associated with the
 * IOCB with the provided @ulpstatus and @ulpword4 set to the IOCB commond
 * fields.
 **/
void
lpfc_sli_cancel_iocbs(struct lpfc_hba *phba, struct list_head *iocblist,
                      uint32_t ulpstatus, uint32_t ulpWord4)
{
        struct lpfc_iocbq *piocb;

        while (!list_empty(iocblist)) {
                list_remove_head(iocblist, piocb, struct lpfc_iocbq, list);

                if (!piocb->iocb_cmpl)
                        lpfc_sli_release_iocbq(phba, piocb);
                else {
                        piocb->iocb.ulpStatus = ulpstatus;
                        piocb->iocb.un.ulpWord[4] = ulpWord4;
                        (piocb->iocb_cmpl) (phba, piocb, piocb);
                }
        }
        return;
}

/**
 * lpfc_sli_iocb_cmd_type - Get the iocb type
 * @iocb_cmnd: iocb command code.
 *
 * This function is called by ring event handler function to get the iocb type.
 * This function translates the iocb command to an iocb command type used to
 * decide the final disposition of each completed IOCB.
 * The function returns
 * LPFC_UNKNOWN_IOCB if it is an unsupported iocb
 * LPFC_SOL_IOCB     if it is a solicited iocb completion
 * LPFC_ABORT_IOCB   if it is an abort iocb
 * LPFC_UNSOL_IOCB   if it is an unsolicited iocb
 *
 * The caller is not required to hold any lock.
 **/
static lpfc_iocb_type
lpfc_sli_iocb_cmd_type(uint8_t iocb_cmnd)
{
        lpfc_iocb_type type = LPFC_UNKNOWN_IOCB;

        if (iocb_cmnd > CMD_MAX_IOCB_CMD)
                return 0;

        switch (iocb_cmnd) {
        case CMD_XMIT_SEQUENCE_CR:
        case CMD_XMIT_SEQUENCE_CX:
        case CMD_XMIT_BCAST_CN:
        case CMD_XMIT_BCAST_CX:
        case CMD_ELS_REQUEST_CR:
        case CMD_ELS_REQUEST_CX:
        case CMD_CREATE_XRI_CR:
        case CMD_CREATE_XRI_CX:
        case CMD_GET_RPI_CN:
        case CMD_XMIT_ELS_RSP_CX:
        case CMD_GET_RPI_CR:
        case CMD_FCP_IWRITE_CR:
        case CMD_FCP_IWRITE_CX:
        case CMD_FCP_IREAD_CR:
        case CMD_FCP_IREAD_CX:
        case CMD_FCP_ICMND_CR:
        case CMD_FCP_ICMND_CX:
        case CMD_FCP_TSEND_CX:
        case CMD_FCP_TRSP_CX:
        case CMD_FCP_TRECEIVE_CX:
        case CMD_FCP_AUTO_TRSP_CX:
        case CMD_ADAPTER_MSG:
        case CMD_ADAPTER_DUMP:
        case CMD_XMIT_SEQUENCE64_CR:
        case CMD_XMIT_SEQUENCE64_CX:
        case CMD_XMIT_BCAST64_CN:
        case CMD_XMIT_BCAST64_CX:
        case CMD_ELS_REQUEST64_CR:
        case CMD_ELS_REQUEST64_CX:
        case CMD_FCP_IWRITE64_CR:
        case CMD_FCP_IWRITE64_CX:
        case CMD_FCP_IREAD64_CR:
        case CMD_FCP_IREAD64_CX:
        case CMD_FCP_ICMND64_CR:
        case CMD_FCP_ICMND64_CX:
        case CMD_FCP_TSEND64_CX:
        case CMD_FCP_TRSP64_CX:
        case CMD_FCP_TRECEIVE64_CX:
        case CMD_GEN_REQUEST64_CR:
        case CMD_GEN_REQUEST64_CX:
        case CMD_XMIT_ELS_RSP64_CX:
                type = LPFC_SOL_IOCB;
                break;
        case CMD_ABORT_XRI_CN:
        case CMD_ABORT_XRI_CX:
        case CMD_CLOSE_XRI_CN:
        case CMD_CLOSE_XRI_CX:
        case CMD_XRI_ABORTED_CX:
        case CMD_ABORT_MXRI64_CN:
                type = LPFC_ABORT_IOCB;
                break;
        case CMD_RCV_SEQUENCE_CX:
        case CMD_RCV_ELS_REQ_CX:
        case CMD_RCV_SEQUENCE64_CX:
        case CMD_RCV_ELS_REQ64_CX:
        case CMD_ASYNC_STATUS:
        case CMD_IOCB_RCV_SEQ64_CX:
        case CMD_IOCB_RCV_ELS64_CX:
        case CMD_IOCB_RCV_CONT64_CX:
        case CMD_IOCB_RET_XRI64_CX:
                type = LPFC_UNSOL_IOCB;
                break;
        case CMD_IOCB_XMIT_MSEQ64_CR:
        case CMD_IOCB_XMIT_MSEQ64_CX:
        case CMD_IOCB_RCV_SEQ_LIST64_CX:
        case CMD_IOCB_RCV_ELS_LIST64_CX:
        case CMD_IOCB_CLOSE_EXTENDED_CN:
        case CMD_IOCB_ABORT_EXTENDED_CN:
        case CMD_IOCB_RET_HBQE64_CN:
        case CMD_IOCB_FCP_IBIDIR64_CR:
        case CMD_IOCB_FCP_IBIDIR64_CX:
        case CMD_IOCB_FCP_ITASKMGT64_CX:
        case CMD_IOCB_LOGENTRY_CN:
        case CMD_IOCB_LOGENTRY_ASYNC_CN:
                printk("%s - Unhandled SLI-3 Command x%x\n",
                                __func__, iocb_cmnd);
                type = LPFC_UNKNOWN_IOCB;
                break;
        default:
                type = LPFC_UNKNOWN_IOCB;
                break;
        }

        return type;
}

/**
 * lpfc_sli_ring_map - Issue config_ring mbox for all rings
 * @phba: Pointer to HBA context object.
 *
 * This function is called from SLI initialization code
 * to configure every ring of the HBA's SLI interface. The
 * caller is not required to hold any lock. This function issues
 * a config_ring mailbox command for each ring.
 * This function returns zero if successful else returns a negative
 * error code.
 **/
static int
lpfc_sli_ring_map(struct lpfc_hba *phba)
{
        struct lpfc_sli *psli = &phba->sli;
        LPFC_MBOXQ_t *pmb;
        MAILBOX_t *pmbox;
        int i, rc, ret = 0;

        pmb = (LPFC_MBOXQ_t *) mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
        if (!pmb)
                return -ENOMEM;
        pmbox = &pmb->mb;
        phba->link_state = LPFC_INIT_MBX_CMDS;
        for (i = 0; i < psli->num_rings; i++) {
                lpfc_config_ring(phba, i, pmb);
                rc = lpfc_sli_issue_mbox(phba, pmb, MBX_POLL);
                if (rc != MBX_SUCCESS) {
                        lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
                                        "0446 Adapter failed to init (%d), "
                                        "mbxCmd x%x CFG_RING, mbxStatus x%x, "
                                        "ring %d\n",
                                        rc, pmbox->mbxCommand,
                                        pmbox->mbxStatus, i);
                        phba->link_state = LPFC_HBA_ERROR;
                        ret = -ENXIO;
                        break;
                }
        }
        mempool_free(pmb, phba->mbox_mem_pool);
        return ret;
}

/**
 * lpfc_sli_ringtxcmpl_put - Adds new iocb to the txcmplq
 * @phba: Pointer to HBA context object.
 * @pring: Pointer to driver SLI ring object.
 * @piocb: Pointer to the driver iocb object.
 *
 * This function is called with hbalock held. The function adds the
 * new iocb to txcmplq of the given ring. This function always returns
 * 0. If this function is called for ELS ring, this function checks if
 * there is a vport associated with the ELS command. This function also
 * starts els_tmofunc timer if this is an ELS command.
 **/
static int
lpfc_sli_ringtxcmpl_put(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                        struct lpfc_iocbq *piocb)
{
        list_add_tail(&piocb->list, &pring->txcmplq);
        pring->txcmplq_cnt++;
        if ((unlikely(pring->ringno == LPFC_ELS_RING)) &&
           (piocb->iocb.ulpCommand != CMD_ABORT_XRI_CN) &&
           (piocb->iocb.ulpCommand != CMD_CLOSE_XRI_CN)) {
                if (!piocb->vport)
                        BUG();
                else
                        mod_timer(&piocb->vport->els_tmofunc,
                                  jiffies + HZ * (phba->fc_ratov << 1));
        }


        return 0;
}

/**
 * lpfc_sli_ringtx_get - Get first element of the txq
 * @phba: Pointer to HBA context object.
 * @pring: Pointer to driver SLI ring object.
 *
 * This function is called with hbalock held to get next
 * iocb in txq of the given ring. If there is any iocb in
 * the txq, the function returns first iocb in the list after
 * removing the iocb from the list, else it returns NULL.
 **/
static struct lpfc_iocbq *
lpfc_sli_ringtx_get(struct lpfc_hba *phba, struct lpfc_sli_ring *pring)
{
        struct lpfc_iocbq *cmd_iocb;

        list_remove_head((&pring->txq), cmd_iocb, struct lpfc_iocbq, list);
        if (cmd_iocb != NULL)
                pring->txq_cnt--;
        return cmd_iocb;
}

/**
 * lpfc_sli_next_iocb_slot - Get next iocb slot in the ring
 * @phba: Pointer to HBA context object.
 * @pring: Pointer to driver SLI ring object.
 *
 * This function is called with hbalock held and the caller must post the
 * iocb without releasing the lock. If the caller releases the lock,
 * iocb slot returned by the function is not guaranteed to be available.
 * The function returns pointer to the next available iocb slot if there
 * is available slot in the ring, else it returns NULL.
 * If the get index of the ring is ahead of the put index, the function
 * will post an error attention event to the worker thread to take the
 * HBA to offline state.
 **/
static IOCB_t *
lpfc_sli_next_iocb_slot (struct lpfc_hba *phba, struct lpfc_sli_ring *pring)
{
        struct lpfc_pgp *pgp = &phba->port_gp[pring->ringno];
        uint32_t  max_cmd_idx = pring->numCiocb;
        if ((pring->next_cmdidx == pring->cmdidx) &&
           (++pring->next_cmdidx >= max_cmd_idx))
                pring->next_cmdidx = 0;

        if (unlikely(pring->local_getidx == pring->next_cmdidx)) {

                pring->local_getidx = le32_to_cpu(pgp->cmdGetInx);

                if (unlikely(pring->local_getidx >= max_cmd_idx)) {
                        lpfc_printf_log(phba, KERN_ERR, LOG_SLI,
                                        "0315 Ring %d issue: portCmdGet %d "
                                        "is bigger than cmd ring %d\n",
                                        pring->ringno,
                                        pring->local_getidx, max_cmd_idx);

                        phba->link_state = LPFC_HBA_ERROR;
                        /*
                         * All error attention handlers are posted to
                         * worker thread
                         */
                        phba->work_ha |= HA_ERATT;
                        phba->work_hs = HS_FFER3;

                        lpfc_worker_wake_up(phba);

                        return NULL;
                }

                if (pring->local_getidx == pring->next_cmdidx)
                        return NULL;
        }

        return lpfc_cmd_iocb(phba, pring);
}

/**
 * lpfc_sli_next_iotag - Get an iotag for the iocb
 * @phba: Pointer to HBA context object.
 * @iocbq: Pointer to driver iocb object.
 *
 * This function gets an iotag for the iocb. If there is no unused iotag and
 * the iocbq_lookup_len < 0xffff, this function allocates a bigger iotag_lookup
 * array and assigns a new iotag.
 * The function returns the allocated iotag if successful, else returns zero.
 * Zero is not a valid iotag.
 * The caller is not required to hold any lock.
 **/
uint16_t
lpfc_sli_next_iotag(struct lpfc_hba *phba, struct lpfc_iocbq *iocbq)
{
        struct lpfc_iocbq **new_arr;
        struct lpfc_iocbq **old_arr;
        size_t new_len;
        struct lpfc_sli *psli = &phba->sli;
        uint16_t iotag;

        spin_lock_irq(&phba->hbalock);
        iotag = psli->last_iotag;
        if(++iotag < psli->iocbq_lookup_len) {
                psli->last_iotag = iotag;
                psli->iocbq_lookup[iotag] = iocbq;
                spin_unlock_irq(&phba->hbalock);
                iocbq->iotag = iotag;
                return iotag;
        } else if (psli->iocbq_lookup_len < (0xffff
                                           - LPFC_IOCBQ_LOOKUP_INCREMENT)) {
                new_len = psli->iocbq_lookup_len + LPFC_IOCBQ_LOOKUP_INCREMENT;
                spin_unlock_irq(&phba->hbalock);
                new_arr = kzalloc(new_len * sizeof (struct lpfc_iocbq *),
                                  GFP_KERNEL);
                if (new_arr) {
                        spin_lock_irq(&phba->hbalock);
                        old_arr = psli->iocbq_lookup;
                        if (new_len <= psli->iocbq_lookup_len) {
                                /* highly unprobable case */
                                kfree(new_arr);
                                iotag = psli->last_iotag;
                                if(++iotag < psli->iocbq_lookup_len) {
                                        psli->last_iotag = iotag;
                                        psli->iocbq_lookup[iotag] = iocbq;
                                        spin_unlock_irq(&phba->hbalock);
                                        iocbq->iotag = iotag;
                                        return iotag;
                                }
                                spin_unlock_irq(&phba->hbalock);
                                return 0;
                        }
                        if (psli->iocbq_lookup)
                                memcpy(new_arr, old_arr,
                                       ((psli->last_iotag  + 1) *
                                        sizeof (struct lpfc_iocbq *)));
                        psli->iocbq_lookup = new_arr;
                        psli->iocbq_lookup_len = new_len;
                        psli->last_iotag = iotag;
                        psli->iocbq_lookup[iotag] = iocbq;
                        spin_unlock_irq(&phba->hbalock);
                        iocbq->iotag = iotag;
                        kfree(old_arr);
                        return iotag;
                }
        } else
                spin_unlock_irq(&phba->hbalock);

        lpfc_printf_log(phba, KERN_ERR,LOG_SLI,
                        "0318 Failed to allocate IOTAG.last IOTAG is %d\n",
                        psli->last_iotag);

        return 0;
}

/**
 * lpfc_sli_submit_iocb - Submit an iocb to the firmware
 * @phba: Pointer to HBA context object.
 * @pring: Pointer to driver SLI ring object.
 * @iocb: Pointer to iocb slot in the ring.
 * @nextiocb: Pointer to driver iocb object which need to be
 *            posted to firmware.
 *
 * This function is called with hbalock held to post a new iocb to
 * the firmware. This function copies the new iocb to ring iocb slot and
 * updates the ring pointers. It adds the new iocb to txcmplq if there is
 * a completion call back for this iocb else the function will free the
 * iocb object.
 **/
static void
lpfc_sli_submit_iocb(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                IOCB_t *iocb, struct lpfc_iocbq *nextiocb)
{
        /*
         * Set up an iotag
         */
        nextiocb->iocb.ulpIoTag = (nextiocb->iocb_cmpl) ? nextiocb->iotag : 0;


        if (pring->ringno == LPFC_ELS_RING) {
                lpfc_debugfs_slow_ring_trc(phba,
                        "IOCB cmd ring:   wd4:x%08x wd6:x%08x wd7:x%08x",
                        *(((uint32_t *) &nextiocb->iocb) + 4),
                        *(((uint32_t *) &nextiocb->iocb) + 6),
                        *(((uint32_t *) &nextiocb->iocb) + 7));
        }

        /*
         * Issue iocb command to adapter
         */
        lpfc_sli_pcimem_bcopy(&nextiocb->iocb, iocb, phba->iocb_cmd_size);
        wmb();
        pring->stats.iocb_cmd++;

        /*
         * If there is no completion routine to call, we can release the
         * IOCB buffer back right now. For IOCBs, like QUE_RING_BUF,
         * that have no rsp ring completion, iocb_cmpl MUST be NULL.
         */
        if (nextiocb->iocb_cmpl)
                lpfc_sli_ringtxcmpl_put(phba, pring, nextiocb);
        else
                __lpfc_sli_release_iocbq(phba, nextiocb);

        /*
         * Let the HBA know what IOCB slot will be the next one the
         * driver will put a command into.
         */
        pring->cmdidx = pring->next_cmdidx;
        writel(pring->cmdidx, &phba->host_gp[pring->ringno].cmdPutInx);
}

/**
 * lpfc_sli_update_full_ring - Update the chip attention register
 * @phba: Pointer to HBA context object.
 * @pring: Pointer to driver SLI ring object.
 *
 * The caller is not required to hold any lock for calling this function.
 * This function updates the chip attention bits for the ring to inform firmware
 * that there are pending work to be done for this ring and requests an
 * interrupt when there is space available in the ring. This function is
 * called when the driver is unable to post more iocbs to the ring due
 * to unavailability of space in the ring.
 **/
static void
lpfc_sli_update_full_ring(struct lpfc_hba *phba, struct lpfc_sli_ring *pring)
{
        int ringno = pring->ringno;

        pring->flag |= LPFC_CALL_RING_AVAILABLE;

        wmb();

        /*
         * Set ring 'ringno' to SET R0CE_REQ in Chip Att register.
         * The HBA will tell us when an IOCB entry is available.
         */
        writel((CA_R0ATT|CA_R0CE_REQ) << (ringno*4), phba->CAregaddr);
        readl(phba->CAregaddr); /* flush */

        pring->stats.iocb_cmd_full++;
}

/**
 * lpfc_sli_update_ring - Update chip attention register
 * @phba: Pointer to HBA context object.
 * @pring: Pointer to driver SLI ring object.
 *
 * This function updates the chip attention register bit for the
 * given ring to inform HBA that there is more work to be done
 * in this ring. The caller is not required to hold any lock.
 **/
static void
lpfc_sli_update_ring(struct lpfc_hba *phba, struct lpfc_sli_ring *pring)
{
        int ringno = pring->ringno;

        /*
         * Tell the HBA that there is work to do in this ring.
         */
        if (!(phba->sli3_options & LPFC_SLI3_CRP_ENABLED)) {
                wmb();
                writel(CA_R0ATT << (ringno * 4), phba->CAregaddr);
                readl(phba->CAregaddr); /* flush */
        }
}

/**
 * lpfc_sli_resume_iocb - Process iocbs in the txq
 * @phba: Pointer to HBA context object.
 * @pring: Pointer to driver SLI ring object.
 *
 * This function is called with hbalock held to post pending iocbs
 * in the txq to the firmware. This function is called when driver
 * detects space available in the ring.
 **/
static void
lpfc_sli_resume_iocb(struct lpfc_hba *phba, struct lpfc_sli_ring *pring)
{
        IOCB_t *iocb;
        struct lpfc_iocbq *nextiocb;

        /*
         * Check to see if:
         *  (a) there is anything on the txq to send
         *  (b) link is up
         *  (c) link attention events can be processed (fcp ring only)
         *  (d) IOCB processing is not blocked by the outstanding mbox command.
         */
        if (pring->txq_cnt &&
            lpfc_is_link_up(phba) &&
            (pring->ringno != phba->sli.fcp_ring ||
             phba->sli.sli_flag & LPFC_PROCESS_LA)) {

                while ((iocb = lpfc_sli_next_iocb_slot(phba, pring)) &&
                       (nextiocb = lpfc_sli_ringtx_get(phba, pring)))
                        lpfc_sli_submit_iocb(phba, pring, iocb, nextiocb);

                if (iocb)
                        lpfc_sli_update_ring(phba, pring);
                else
                        lpfc_sli_update_full_ring(phba, pring);
        }

        return;
}

/**
 * lpfc_sli_next_hbq_slot - Get next hbq entry for the HBQ
 * @phba: Pointer to HBA context object.
 * @hbqno: HBQ number.
 *
 * This function is called with hbalock held to get the next
 * available slot for the given HBQ. If there is free slot
 * available for the HBQ it will return pointer to the next available
 * HBQ entry else it will return NULL.
 **/
static struct lpfc_hbq_entry *
lpfc_sli_next_hbq_slot(struct lpfc_hba *phba, uint32_t hbqno)
{
        struct hbq_s *hbqp = &phba->hbqs[hbqno];

        if (hbqp->next_hbqPutIdx == hbqp->hbqPutIdx &&
            ++hbqp->next_hbqPutIdx >= hbqp->entry_count)
                hbqp->next_hbqPutIdx = 0;

        if (unlikely(hbqp->local_hbqGetIdx == hbqp->next_hbqPutIdx)) {
                uint32_t raw_index = phba->hbq_get[hbqno];
                uint32_t getidx = le32_to_cpu(raw_index);

                hbqp->local_hbqGetIdx = getidx;

                if (unlikely(hbqp->local_hbqGetIdx >= hbqp->entry_count)) {
                        lpfc_printf_log(phba, KERN_ERR,
                                        LOG_SLI | LOG_VPORT,
                                        "1802 HBQ %d: local_hbqGetIdx "
                                        "%u is > than hbqp->entry_count %u\n",
                                        hbqno, hbqp->local_hbqGetIdx,
                                        hbqp->entry_count);

                        phba->link_state = LPFC_HBA_ERROR;
                        return NULL;
                }

                if (hbqp->local_hbqGetIdx == hbqp->next_hbqPutIdx)
                        return NULL;
        }

        return (struct lpfc_hbq_entry *) phba->hbqs[hbqno].hbq_virt +
                        hbqp->hbqPutIdx;
}

/**
 * lpfc_sli_hbqbuf_free_all - Free all the hbq buffers
 * @phba: Pointer to HBA context object.
 *
 * This function is called with no lock held to free all the
 * hbq buffers while uninitializing the SLI interface. It also
 * frees the HBQ buffers returned by the firmware but not yet
 * processed by the upper layers.
 **/
void
lpfc_sli_hbqbuf_free_all(struct lpfc_hba *phba)
{
        struct lpfc_dmabuf *dmabuf, *next_dmabuf;
        struct hbq_dmabuf *hbq_buf;
        unsigned long flags;
        int i, hbq_count;
        uint32_t hbqno;

        hbq_count = lpfc_sli_hbq_count();
        /* Return all memory used by all HBQs */
        spin_lock_irqsave(&phba->hbalock, flags);
        for (i = 0; i < hbq_count; ++i) {
                list_for_each_entry_safe(dmabuf, next_dmabuf,
                                &phba->hbqs[i].hbq_buffer_list, list) {
                        hbq_buf = container_of(dmabuf, struct hbq_dmabuf, dbuf);
                        list_del(&hbq_buf->dbuf.list);
                        (phba->hbqs[i].hbq_free_buffer)(phba, hbq_buf);
                }
                phba->hbqs[i].buffer_count = 0;
        }
        /* Return all HBQ buffer that are in-fly */
        list_for_each_entry_safe(dmabuf, next_dmabuf,
                        &phba->hbqbuf_in_list, list) {
                hbq_buf = container_of(dmabuf, struct hbq_dmabuf, dbuf);
                list_del(&hbq_buf->dbuf.list);
                if (hbq_buf->tag == -1) {
                        (phba->hbqs[LPFC_ELS_HBQ].hbq_free_buffer)
                                (phba, hbq_buf);
                } else {
                        hbqno = hbq_buf->tag >> 16;
                        if (hbqno >= LPFC_MAX_HBQS)
                                (phba->hbqs[LPFC_ELS_HBQ].hbq_free_buffer)
                                        (phba, hbq_buf);
                        else
                                (phba->hbqs[hbqno].hbq_free_buffer)(phba,
                                        hbq_buf);
                }
        }

        /* Mark the HBQs not in use */
        phba->hbq_in_use = 0;
        spin_unlock_irqrestore(&phba->hbalock, flags);
}

/**
 * lpfc_sli_hbq_to_firmware - Post the hbq buffer to firmware
 * @phba: Pointer to HBA context object.
 * @hbqno: HBQ number.
 * @hbq_buf: Pointer to HBQ buffer.
 *
 * This function is called with the hbalock held to post a
 * hbq buffer to the firmware. If the function finds an empty
 * slot in the HBQ, it will post the buffer. The function will return
 * pointer to the hbq entry if it successfully post the buffer
 * else it will return NULL.
 **/
static struct lpfc_hbq_entry *
lpfc_sli_hbq_to_firmware(struct lpfc_hba *phba, uint32_t hbqno,
                         struct hbq_dmabuf *hbq_buf)
{
        struct lpfc_hbq_entry *hbqe;
        dma_addr_t physaddr = hbq_buf->dbuf.phys;

        /* Get next HBQ entry slot to use */
        hbqe = lpfc_sli_next_hbq_slot(phba, hbqno);
        if (hbqe) {
                struct hbq_s *hbqp = &phba->hbqs[hbqno];

                hbqe->bde.addrHigh = le32_to_cpu(putPaddrHigh(physaddr));
                hbqe->bde.addrLow  = le32_to_cpu(putPaddrLow(physaddr));
                hbqe->bde.tus.f.bdeSize = hbq_buf->size;
                hbqe->bde.tus.f.bdeFlags = 0;
                hbqe->bde.tus.w = le32_to_cpu(hbqe->bde.tus.w);
                hbqe->buffer_tag = le32_to_cpu(hbq_buf->tag);
                                /* Sync SLIM */
                hbqp->hbqPutIdx = hbqp->next_hbqPutIdx;
                writel(hbqp->hbqPutIdx, phba->hbq_put + hbqno);
                                /* flush */
                readl(phba->hbq_put + hbqno);
                list_add_tail(&hbq_buf->dbuf.list, &hbqp->hbq_buffer_list);
        }
        return hbqe;
}

/* HBQ for ELS and CT traffic. */
static struct lpfc_hbq_init lpfc_els_hbq = {
        .rn = 1,
        .entry_count = 200,
        .mask_count = 0,
        .profile = 0,
        .ring_mask = (1 << LPFC_ELS_RING),
        .buffer_count = 0,
        .init_count = 40,
        .add_count = 40,
};

/* HBQ for the extra ring if needed */
static struct lpfc_hbq_init lpfc_extra_hbq = {
        .rn = 1,
        .entry_count = 200,
        .mask_count = 0,
        .profile = 0,
        .ring_mask = (1 << LPFC_EXTRA_RING),
        .buffer_count = 0,
        .init_count = 0,
        .add_count = 5,
};

/* Array of HBQs */
struct lpfc_hbq_init *lpfc_hbq_defs[] = {
        &lpfc_els_hbq,
        &lpfc_extra_hbq,
};

/**
 * lpfc_sli_hbqbuf_fill_hbqs - Post more hbq buffers to HBQ
 * @phba: Pointer to HBA context object.
 * @hbqno: HBQ number.
 * @count: Number of HBQ buffers to be posted.
 *
 * This function is called with no lock held to post more hbq buffers to the
 * given HBQ. The function returns the number of HBQ buffers successfully
 * posted.
 **/
static int
lpfc_sli_hbqbuf_fill_hbqs(struct lpfc_hba *phba, uint32_t hbqno, uint32_t count)
{
        uint32_t i, posted = 0;
        unsigned long flags;
        struct hbq_dmabuf *hbq_buffer;
        LIST_HEAD(hbq_buf_list);
        if (!phba->hbqs[hbqno].hbq_alloc_buffer)
                return 0;

        if ((phba->hbqs[hbqno].buffer_count + count) >
            lpfc_hbq_defs[hbqno]->entry_count)
                count = lpfc_hbq_defs[hbqno]->entry_count -
                                        phba->hbqs[hbqno].buffer_count;
        if (!count)
                return 0;
        /* Allocate HBQ entries */
        for (i = 0; i < count; i++) {
                hbq_buffer = (phba->hbqs[hbqno].hbq_alloc_buffer)(phba);
                if (!hbq_buffer)
                        break;
                list_add_tail(&hbq_buffer->dbuf.list, &hbq_buf_list);
        }
        /* Check whether HBQ is still in use */
        spin_lock_irqsave(&phba->hbalock, flags);
        if (!phba->hbq_in_use)
                goto err;
        while (!list_empty(&hbq_buf_list)) {
                list_remove_head(&hbq_buf_list, hbq_buffer, struct hbq_dmabuf,
                                 dbuf.list);
                hbq_buffer->tag = (phba->hbqs[hbqno].buffer_count |
                                      (hbqno << 16));
                if (lpfc_sli_hbq_to_firmware(phba, hbqno, hbq_buffer)) {
                        phba->hbqs[hbqno].buffer_count++;
                        posted++;
                } else
                        (phba->hbqs[hbqno].hbq_free_buffer)(phba, hbq_buffer);
        }
        spin_unlock_irqrestore(&phba->hbalock, flags);
        return posted;
err:
        spin_unlock_irqrestore(&phba->hbalock, flags);
        while (!list_empty(&hbq_buf_list)) {
                list_remove_head(&hbq_buf_list, hbq_buffer, struct hbq_dmabuf,
                                 dbuf.list);
                (phba->hbqs[hbqno].hbq_free_buffer)(phba, hbq_buffer);
        }
        return 0;
}

/**
 * lpfc_sli_hbqbuf_add_hbqs - Post more HBQ buffers to firmware
 * @phba: Pointer to HBA context object.
 * @qno: HBQ number.
 *
 * This function posts more buffers to the HBQ. This function
 * is called with no lock held. The function returns the number of HBQ entries
 * successfully allocated.
 **/
int
lpfc_sli_hbqbuf_add_hbqs(struct lpfc_hba *phba, uint32_t qno)
{
        return(lpfc_sli_hbqbuf_fill_hbqs(phba, qno,
                                         lpfc_hbq_defs[qno]->add_count));
}

/**
 * lpfc_sli_hbqbuf_init_hbqs - Post initial buffers to the HBQ
 * @phba: Pointer to HBA context object.
 * @qno:  HBQ queue number.
 *
 * This function is called from SLI initialization code path with
 * no lock held to post initial HBQ buffers to firmware. The
 * function returns the number of HBQ entries successfully allocated.
 **/
static int
lpfc_sli_hbqbuf_init_hbqs(struct lpfc_hba *phba, uint32_t qno)
{
        return(lpfc_sli_hbqbuf_fill_hbqs(phba, qno,
                                         lpfc_hbq_defs[qno]->init_count));
}

/**
 * lpfc_sli_hbqbuf_find - Find the hbq buffer associated with a tag
 * @phba: Pointer to HBA context object.
 * @tag: Tag of the hbq buffer.
 *
 * This function is called with hbalock held. This function searches
 * for the hbq buffer associated with the given tag in the hbq buffer
 * list. If it finds the hbq buffer, it returns the hbq_buffer other wise
 * it returns NULL.
 **/
static struct hbq_dmabuf *
lpfc_sli_hbqbuf_find(struct lpfc_hba *phba, uint32_t tag)
{
        struct lpfc_dmabuf *d_buf;
        struct hbq_dmabuf *hbq_buf;
        uint32_t hbqno;

        hbqno = tag >> 16;
        if (hbqno >= LPFC_MAX_HBQS)
                return NULL;

        list_for_each_entry(d_buf, &phba->hbqs[hbqno].hbq_buffer_list, list) {
                hbq_buf = container_of(d_buf, struct hbq_dmabuf, dbuf);
                if (hbq_buf->tag == tag) {
                        return hbq_buf;
                }
        }
        lpfc_printf_log(phba, KERN_ERR, LOG_SLI | LOG_VPORT,
                        "1803 Bad hbq tag. Data: x%x x%x\n",
                        tag, phba->hbqs[tag >> 16].buffer_count);
        return NULL;
}

/**
 * lpfc_sli_free_hbq - Give back the hbq buffer to firmware
 * @phba: Pointer to HBA context object.
 * @hbq_buffer: Pointer to HBQ buffer.
 *
 * This function is called with hbalock. This function gives back
 * the hbq buffer to firmware. If the HBQ does not have space to
 * post the buffer, it will free the buffer.
 **/
void
lpfc_sli_free_hbq(struct lpfc_hba *phba, struct hbq_dmabuf *hbq_buffer)
{
        uint32_t hbqno;

        if (hbq_buffer) {
                hbqno = hbq_buffer->tag >> 16;
                if (!lpfc_sli_hbq_to_firmware(phba, hbqno, hbq_buffer)) {
                        (phba->hbqs[hbqno].hbq_free_buffer)(phba, hbq_buffer);
                }
        }
}

/**
 * lpfc_sli_chk_mbx_command - Check if the mailbox is a legitimate mailbox
 * @mbxCommand: mailbox command code.
 *
 * This function is called by the mailbox event handler function to verify
 * that the completed mailbox command is a legitimate mailbox command. If the
 * completed mailbox is not known to the function, it will return MBX_SHUTDOWN
 * and the mailbox event handler will take the HBA offline.
 **/
static int
lpfc_sli_chk_mbx_command(uint8_t mbxCommand)
{
        uint8_t ret;

        switch (mbxCommand) {
        case MBX_LOAD_SM:
        case MBX_READ_NV:
        case MBX_WRITE_NV:
        case MBX_WRITE_VPARMS:
        case MBX_RUN_BIU_DIAG:
        case MBX_INIT_LINK:
        case MBX_DOWN_LINK:
        case MBX_CONFIG_LINK:
        case MBX_CONFIG_RING:
        case MBX_RESET_RING:
        case MBX_READ_CONFIG:
        case MBX_READ_RCONFIG:
        case MBX_READ_SPARM:
        case MBX_READ_STATUS:
        case MBX_READ_RPI:
        case MBX_READ_XRI:
        case MBX_READ_REV:
        case MBX_READ_LNK_STAT:
        case MBX_REG_LOGIN:
        case MBX_UNREG_LOGIN:
        case MBX_READ_LA:
        case MBX_CLEAR_LA:
        case MBX_DUMP_MEMORY:
        case MBX_DUMP_CONTEXT:
        case MBX_RUN_DIAGS:
        case MBX_RESTART:
        case MBX_UPDATE_CFG:
        case MBX_DOWN_LOAD:
        case MBX_DEL_LD_ENTRY:
        case MBX_RUN_PROGRAM:
        case MBX_SET_MASK:
        case MBX_SET_VARIABLE:
        case MBX_UNREG_D_ID:
        case MBX_KILL_BOARD:
        case MBX_CONFIG_FARP:
        case MBX_BEACON:
        case MBX_LOAD_AREA:
        case MBX_RUN_BIU_DIAG64:
        case MBX_CONFIG_PORT:
        case MBX_READ_SPARM64:
        case MBX_READ_RPI64:
        case MBX_REG_LOGIN64:
        case MBX_READ_LA64:
        case MBX_WRITE_WWN:
        case MBX_SET_DEBUG:
        case MBX_LOAD_EXP_ROM:
        case MBX_ASYNCEVT_ENABLE:
        case MBX_REG_VPI:
        case MBX_UNREG_VPI:
        case MBX_HEARTBEAT:
        case MBX_PORT_CAPABILITIES:
        case MBX_PORT_IOV_CONTROL:
                ret = mbxCommand;
                break;
        default:
                ret = MBX_SHUTDOWN;
                break;
        }
        return ret;
}

/**
 * lpfc_sli_wake_mbox_wait - lpfc_sli_issue_mbox_wait mbox completion handler
 * @phba: Pointer to HBA context object.
 * @pmboxq: Pointer to mailbox command.
 *
 * This is completion handler function for mailbox commands issued from
 * lpfc_sli_issue_mbox_wait function. This function is called by the
 * mailbox event handler function with no lock held. This function
 * will wake up thread waiting on the wait queue pointed by context1
 * of the mailbox.
 **/
static void
lpfc_sli_wake_mbox_wait(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmboxq)
{
        wait_queue_head_t *pdone_q;
        unsigned long drvr_flag;

        /*
         * If pdone_q is empty, the driver thread gave up waiting and
         * continued running.
         */
        pmboxq->mbox_flag |= LPFC_MBX_WAKE;
        spin_lock_irqsave(&phba->hbalock, drvr_flag);
        pdone_q = (wait_queue_head_t *) pmboxq->context1;
        if (pdone_q)
                wake_up_interruptible(pdone_q);
        spin_unlock_irqrestore(&phba->hbalock, drvr_flag);
        return;
}


/**
 * lpfc_sli_def_mbox_cmpl - Default mailbox completion handler
 * @phba: Pointer to HBA context object.
 * @pmb: Pointer to mailbox object.
 *
 * This function is the default mailbox completion handler. It
 * frees the memory resources associated with the completed mailbox
 * command. If the completed command is a REG_LOGIN mailbox command,
 * this function will issue a UREG_LOGIN to re-claim the RPI.
 **/
void
lpfc_sli_def_mbox_cmpl(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
{
        struct lpfc_dmabuf *mp;
        uint16_t rpi;
        int rc;

        mp = (struct lpfc_dmabuf *) (pmb->context1);

        if (mp) {
                lpfc_mbuf_free(phba, mp->virt, mp->phys);
                kfree(mp);
        }

        /*
         * If a REG_LOGIN succeeded  after node is destroyed or node
         * is in re-discovery driver need to cleanup the RPI.
         */
        if (!(phba->pport->load_flag & FC_UNLOADING) &&
            pmb->mb.mbxCommand == MBX_REG_LOGIN64 &&
            !pmb->mb.mbxStatus) {

                rpi = pmb->mb.un.varWords[0];
                lpfc_unreg_login(phba, pmb->mb.un.varRegLogin.vpi, rpi, pmb);
                pmb->mbox_cmpl = lpfc_sli_def_mbox_cmpl;
                rc = lpfc_sli_issue_mbox(phba, pmb, MBX_NOWAIT);
                if (rc != MBX_NOT_FINISHED)
                        return;
        }

        mempool_free(pmb, phba->mbox_mem_pool);
        return;
}

/**
 * lpfc_sli_handle_mb_event - Handle mailbox completions from firmware
 * @phba: Pointer to HBA context object.
 *
 * This function is called with no lock held. This function processes all
 * the completed mailbox commands and gives it to upper layers. The interrupt
 * service routine processes mailbox completion interrupt and adds completed
 * mailbox commands to the mboxq_cmpl queue and signals the worker thread.
 * Worker thread call lpfc_sli_handle_mb_event, which will return the
 * completed mailbox commands in mboxq_cmpl queue to the upper layers. This
 * function returns the mailbox commands to the upper layer by calling the
 * completion handler function of each mailbox.
 **/
int
lpfc_sli_handle_mb_event(struct lpfc_hba *phba)
{
        MAILBOX_t *pmbox;
        LPFC_MBOXQ_t *pmb;
        int rc;
        LIST_HEAD(cmplq);

        phba->sli.slistat.mbox_event++;

        /* Get all completed mailboxe buffers into the cmplq */
        spin_lock_irq(&phba->hbalock);
        list_splice_init(&phba->sli.mboxq_cmpl, &cmplq);
        spin_unlock_irq(&phba->hbalock);

        /* Get a Mailbox buffer to setup mailbox commands for callback */
        do {
                list_remove_head(&cmplq, pmb, LPFC_MBOXQ_t, list);
                if (pmb == NULL)
                        break;

                pmbox = &pmb->mb;

                if (pmbox->mbxCommand != MBX_HEARTBEAT) {
                        if (pmb->vport) {
                                lpfc_debugfs_disc_trc(pmb->vport,
                                        LPFC_DISC_TRC_MBOX_VPORT,
                                        "MBOX cmpl vport: cmd:x%x mb:x%x x%x",
                                        (uint32_t)pmbox->mbxCommand,
                                        pmbox->un.varWords[0],
                                        pmbox->un.varWords[1]);
                        }
                        else {
                                lpfc_debugfs_disc_trc(phba->pport,
                                        LPFC_DISC_TRC_MBOX,
                                        "MBOX cmpl:       cmd:x%x mb:x%x x%x",
                                        (uint32_t)pmbox->mbxCommand,
                                        pmbox->un.varWords[0],
                                        pmbox->un.varWords[1]);
                        }
                }

                /*
                 * It is a fatal error if unknown mbox command completion.
                 */
                if (lpfc_sli_chk_mbx_command(pmbox->mbxCommand) ==
                    MBX_SHUTDOWN) {
                        /* Unknow mailbox command compl */
                        lpfc_printf_log(phba, KERN_ERR, LOG_MBOX | LOG_SLI,
                                        "(%d):0323 Unknown Mailbox command "
                                        "%x Cmpl\n",
                                        pmb->vport ? pmb->vport->vpi : 0,
                                        pmbox->mbxCommand);
                        phba->link_state = LPFC_HBA_ERROR;
                        phba->work_hs = HS_FFER3;
                        lpfc_handle_eratt(phba);
                        continue;
                }

                if (pmbox->mbxStatus) {
                        phba->sli.slistat.mbox_stat_err++;
                        if (pmbox->mbxStatus == MBXERR_NO_RESOURCES) {
                                /* Mbox cmd cmpl error - RETRYing */
                                lpfc_printf_log(phba, KERN_INFO,
                                                LOG_MBOX | LOG_SLI,
                                                "(%d):0305 Mbox cmd cmpl "
                                                "error - RETRYing Data: x%x "
                                                "x%x x%x x%x\n",
                                                pmb->vport ? pmb->vport->vpi :0,
                                                pmbox->mbxCommand,
                                                pmbox->mbxStatus,
                                                pmbox->un.varWords[0],
                                                pmb->vport->port_state);
                                pmbox->mbxStatus = 0;
                                pmbox->mbxOwner = OWN_HOST;
                                spin_lock_irq(&phba->hbalock);
                                phba->sli.sli_flag &= ~LPFC_SLI_MBOX_ACTIVE;
                                spin_unlock_irq(&phba->hbalock);
                                rc = lpfc_sli_issue_mbox(phba, pmb, MBX_NOWAIT);
                                if (rc == MBX_SUCCESS)
                                        continue;
                        }
                }

                /* Mailbox cmd <cmd> Cmpl <cmpl> */
                lpfc_printf_log(phba, KERN_INFO, LOG_MBOX | LOG_SLI,
                                "(%d):0307 Mailbox cmd x%x Cmpl x%p "
                                "Data: x%x x%x x%x x%x x%x x%x x%x x%x x%x\n",
                                pmb->vport ? pmb->vport->vpi : 0,
                                pmbox->mbxCommand,
                                pmb->mbox_cmpl,
                                *((uint32_t *) pmbox),
                                pmbox->un.varWords[0],
                                pmbox->un.varWords[1],
                                pmbox->un.varWords[2],
                                pmbox->un.varWords[3],
                                pmbox->un.varWords[4],
                                pmbox->un.varWords[5],
                                pmbox->un.varWords[6],
                                pmbox->un.varWords[7]);

                if (pmb->mbox_cmpl)
                        pmb->mbox_cmpl(phba,pmb);
        } while (1);
        return 0;
}

/**
 * lpfc_sli_get_buff - Get the buffer associated with the buffer tag
 * @phba: Pointer to HBA context object.
 * @pring: Pointer to driver SLI ring object.
 * @tag: buffer tag.
 *
 * This function is called with no lock held. When QUE_BUFTAG_BIT bit
 * is set in the tag the buffer is posted for a particular exchange,
 * the function will return the buffer without replacing the buffer.
 * If the buffer is for unsolicited ELS or CT traffic, this function
 * returns the buffer and also posts another buffer to the firmware.
 **/
static struct lpfc_dmabuf *
lpfc_sli_get_buff(struct lpfc_hba *phba,
                  struct lpfc_sli_ring *pring,
                  uint32_t tag)
{
        struct hbq_dmabuf *hbq_entry;

        if (tag & QUE_BUFTAG_BIT)
                return lpfc_sli_ring_taggedbuf_get(phba, pring, tag);
        hbq_entry = lpfc_sli_hbqbuf_find(phba, tag);
        if (!hbq_entry)
                return NULL;
        return &hbq_entry->dbuf;
}


/**
 * lpfc_sli_process_unsol_iocb - Unsolicited iocb handler
 * @phba: Pointer to HBA context object.
 * @pring: Pointer to driver SLI ring object.
 * @saveq: Pointer to the unsolicited iocb.
 *
 * This function is called with no lock held by the ring event handler
 * when there is an unsolicited iocb posted to the response ring by the
 * firmware. This function gets the buffer associated with the iocbs
 * and calls the event handler for the ring. This function handles both
 * qring buffers and hbq buffers.
 * When the function returns 1 the caller can free the iocb object otherwise
 * upper layer functions will free the iocb objects.
 **/
static int
lpfc_sli_process_unsol_iocb(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                            struct lpfc_iocbq *saveq)
{
        IOCB_t           * irsp;
        WORD5            * w5p;
        uint32_t           Rctl, Type;
        uint32_t           match, i;
        struct lpfc_iocbq *iocbq;
        struct lpfc_dmabuf *dmzbuf;

        match = 0;
        irsp = &(saveq->iocb);

        if (irsp->ulpCommand == CMD_ASYNC_STATUS) {
                if (pring->lpfc_sli_rcv_async_status)
                        pring->lpfc_sli_rcv_async_status(phba, pring, saveq);
                else
                        lpfc_printf_log(phba,
                                        KERN_WARNING,
                                        LOG_SLI,
                                        "0316 Ring %d handler: unexpected "
                                        "ASYNC_STATUS iocb received evt_code "
                                        "0x%x\n",
                                        pring->ringno,
                                        irsp->un.asyncstat.evt_code);
                return 1;
        }

        if ((irsp->ulpCommand == CMD_IOCB_RET_XRI64_CX) &&
                (phba->sli3_options & LPFC_SLI3_HBQ_ENABLED)) {
                if (irsp->ulpBdeCount > 0) {
                        dmzbuf = lpfc_sli_get_buff(phba, pring,
                                        irsp->un.ulpWord[3]);
                        lpfc_in_buf_free(phba, dmzbuf);
                }

                if (irsp->ulpBdeCount > 1) {
                        dmzbuf = lpfc_sli_get_buff(phba, pring,
                                        irsp->unsli3.sli3Words[3]);
                        lpfc_in_buf_free(phba, dmzbuf);
                }

                if (irsp->ulpBdeCount > 2) {
                        dmzbuf = lpfc_sli_get_buff(phba, pring,
                                irsp->unsli3.sli3Words[7]);
                        lpfc_in_buf_free(phba, dmzbuf);
                }

                return 1;
        }

        if (phba->sli3_options & LPFC_SLI3_HBQ_ENABLED) {
                if (irsp->ulpBdeCount != 0) {
                        saveq->context2 = lpfc_sli_get_buff(phba, pring,
                                                irsp->un.ulpWord[3]);
                        if (!saveq->context2)
                                lpfc_printf_log(phba,
                                        KERN_ERR,
                                        LOG_SLI,
                                        "0341 Ring %d Cannot find buffer for "
                                        "an unsolicited iocb. tag 0x%x\n",
                                        pring->ringno,
                                        irsp->un.ulpWord[3]);
                }
                if (irsp->ulpBdeCount == 2) {
                        saveq->context3 = lpfc_sli_get_buff(phba, pring,
                                                irsp->unsli3.sli3Words[7]);
                        if (!saveq->context3)
                                lpfc_printf_log(phba,
                                        KERN_ERR,
                                        LOG_SLI,
                                        "0342 Ring %d Cannot find buffer for an"
                                        " unsolicited iocb. tag 0x%x\n",
                                        pring->ringno,
                                        irsp->unsli3.sli3Words[7]);
                }
                list_for_each_entry(iocbq, &saveq->list, list) {
                        irsp = &(iocbq->iocb);
                        if (irsp->ulpBdeCount != 0) {
                                iocbq->context2 = lpfc_sli_get_buff(phba, pring,
                                                        irsp->un.ulpWord[3]);
                                if (!iocbq->context2)
                                        lpfc_printf_log(phba,
                                                KERN_ERR,
                                                LOG_SLI,
                                                "0343 Ring %d Cannot find "
                                                "buffer for an unsolicited iocb"
                                                ". tag 0x%x\n", pring->ringno,
                                                irsp->un.ulpWord[3]);
                        }
                        if (irsp->ulpBdeCount == 2) {
                                iocbq->context3 = lpfc_sli_get_buff(phba, pring,
                                                irsp->unsli3.sli3Words[7]);
                                if (!iocbq->context3)
                                        lpfc_printf_log(phba,
                                                KERN_ERR,
                                                LOG_SLI,
                                                "0344 Ring %d Cannot find "
                                                "buffer for an unsolicited "
                                                "iocb. tag 0x%x\n",
                                                pring->ringno,
                                                irsp->unsli3.sli3Words[7]);
                        }
                }
        }
        if (irsp->ulpBdeCount != 0 &&
            (irsp->ulpCommand == CMD_IOCB_RCV_CONT64_CX ||
             irsp->ulpStatus == IOSTAT_INTERMED_RSP)) {
                int found = 0;

                /* search continue save q for same XRI */
                list_for_each_entry(iocbq, &pring->iocb_continue_saveq, clist) {
                        if (iocbq->iocb.ulpContext == saveq->iocb.ulpContext) {
                                list_add_tail(&saveq->list, &iocbq->list);
                                found = 1;
                                break;
                        }
                }
                if (!found)
                        list_add_tail(&saveq->clist,
                                      &pring->iocb_continue_saveq);
                if (saveq->iocb.ulpStatus != IOSTAT_INTERMED_RSP) {
                        list_del_init(&iocbq->clist);
                        saveq = iocbq;
                        irsp = &(saveq->iocb);
                } else
                        return 0;
        }
        if ((irsp->ulpCommand == CMD_RCV_ELS_REQ64_CX) ||
            (irsp->ulpCommand == CMD_RCV_ELS_REQ_CX) ||
            (irsp->ulpCommand == CMD_IOCB_RCV_ELS64_CX)) {
                Rctl = FC_ELS_REQ;
                Type = FC_ELS_DATA;
        } else {
                w5p = (WORD5 *)&(saveq->iocb.un.ulpWord[5]);
                Rctl = w5p->hcsw.Rctl;
                Type = w5p->hcsw.Type;

                /* Firmware Workaround */
                if ((Rctl == 0) && (pring->ringno == LPFC_ELS_RING) &&
                        (irsp->ulpCommand == CMD_RCV_SEQUENCE64_CX ||
                         irsp->ulpCommand == CMD_IOCB_RCV_SEQ64_CX)) {
                        Rctl = FC_ELS_REQ;
                        Type = FC_ELS_DATA;
                        w5p->hcsw.Rctl = Rctl;
                        w5p->hcsw.Type = Type;
                }
        }

        /* unSolicited Responses */
        if (pring->prt[0].profile) {
                if (pring->prt[0].lpfc_sli_rcv_unsol_event)
                        (pring->prt[0].lpfc_sli_rcv_unsol_event) (phba, pring,
                                                                        saveq);
                match = 1;
        } else {
                /* We must search, based on rctl / type
                   for the right routine */
                for (i = 0; i < pring->num_mask; i++) {
                        if ((pring->prt[i].rctl == Rctl)
                            && (pring->prt[i].type == Type)) {
                                if (pring->prt[i].lpfc_sli_rcv_unsol_event)
                                        (pring->prt[i].lpfc_sli_rcv_unsol_event)
                                                        (phba, pring, saveq);
                                match = 1;
                                break;
                        }
                }
        }
        if (match == 0) {
                /* Unexpected Rctl / Type received */
                /* Ring <ringno> handler: unexpected
                   Rctl <Rctl> Type <Type> received */
                lpfc_printf_log(phba, KERN_WARNING, LOG_SLI,
                                "0313 Ring %d handler: unexpected Rctl x%x "
                                "Type x%x received\n",
                                pring->ringno, Rctl, Type);
        }
        return 1;
}

/**
 * lpfc_sli_iocbq_lookup - Find command iocb for the given response iocb
 * @phba: Pointer to HBA context object.
 * @pring: Pointer to driver SLI ring object.
 * @prspiocb: Pointer to response iocb object.
 *
 * This function looks up the iocb_lookup table to get the command iocb
 * corresponding to the given response iocb using the iotag of the
 * response iocb. This function is called with the hbalock held.
 * This function returns the command iocb object if it finds the command
 * iocb else returns NULL.
 **/
static struct lpfc_iocbq *
lpfc_sli_iocbq_lookup(struct lpfc_hba *phba,
                      struct lpfc_sli_ring *pring,
                      struct lpfc_iocbq *prspiocb)
{
        struct lpfc_iocbq *cmd_iocb = NULL;
        uint16_t iotag;

        iotag = prspiocb->iocb.ulpIoTag;

        if (iotag != 0 && iotag <= phba->sli.last_iotag) {
                cmd_iocb = phba->sli.iocbq_lookup[iotag];
                list_del_init(&cmd_iocb->list);
                pring->txcmplq_cnt--;
                return cmd_iocb;
        }

        lpfc_printf_log(phba, KERN_ERR, LOG_SLI,
                        "0317 iotag x%x is out off "
                        "range: max iotag x%x wd0 x%x\n",
                        iotag, phba->sli.last_iotag,
                        *(((uint32_t *) &prspiocb->iocb) + 7));
        return NULL;
}

/**
 * lpfc_sli_process_sol_iocb - process solicited iocb completion
 * @phba: Pointer to HBA context object.
 * @pring: Pointer to driver SLI ring object.
 * @saveq: Pointer to the response iocb to be processed.
 *
 * This function is called by the ring event handler for non-fcp
 * rings when there is a new response iocb in the response ring.
 * The caller is not required to hold any locks. This function
 * gets the command iocb associated with the response iocb and
 * calls the completion handler for the command iocb. If there
 * is no completion handler, the function will free the resources
 * associated with command iocb. If the response iocb is for
 * an already aborted command iocb, the status of the completion
 * is changed to IOSTAT_LOCAL_REJECT/IOERR_SLI_ABORTED.
 * This function always returns 1.
 **/
static int
lpfc_sli_process_sol_iocb(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                          struct lpfc_iocbq *saveq)
{
        struct lpfc_iocbq *cmdiocbp;
        int rc = 1;
        unsigned long iflag;

        /* Based on the iotag field, get the cmd IOCB from the txcmplq */
        spin_lock_irqsave(&phba->hbalock, iflag);
        cmdiocbp = lpfc_sli_iocbq_lookup(phba, pring, saveq);
        spin_unlock_irqrestore(&phba->hbalock, iflag);

        if (cmdiocbp) {
                if (cmdiocbp->iocb_cmpl) {
                        /*
                         * If an ELS command failed send an event to mgmt
                         * application.
                         */
                        if (saveq->iocb.ulpStatus &&
                             (pring->ringno == LPFC_ELS_RING) &&
                             (cmdiocbp->iocb.ulpCommand ==
                                CMD_ELS_REQUEST64_CR))
                                lpfc_send_els_failure_event(phba,
                                        cmdiocbp, saveq);

                        /*
                         * Post all ELS completions to the worker thread.
                         * All other are passed to the completion callback.
                         */
                        if (pring->ringno == LPFC_ELS_RING) {
                                if (cmdiocbp->iocb_flag & LPFC_DRIVER_ABORTED) {
                                        cmdiocbp->iocb_flag &=
                                                ~LPFC_DRIVER_ABORTED;
                                        saveq->iocb.ulpStatus =
                                                IOSTAT_LOCAL_REJECT;
                                        saveq->iocb.un.ulpWord[4] =
                                                IOERR_SLI_ABORTED;

                                        /* Firmware could still be in progress
                                         * of DMAing payload, so don't free data
                                         * buffer till after a hbeat.
                                         */
                                        saveq->iocb_flag |= LPFC_DELAY_MEM_FREE;
                                }
                        }
                        (cmdiocbp->iocb_cmpl) (phba, cmdiocbp, saveq);
                } else
                        lpfc_sli_release_iocbq(phba, cmdiocbp);
        } else {
                /*
                 * Unknown initiating command based on the response iotag.
                 * This could be the case on the ELS ring because of
                 * lpfc_els_abort().
                 */
                if (pring->ringno != LPFC_ELS_RING) {
                        /*
                         * Ring <ringno> handler: unexpected completion IoTag
                         * <IoTag>
                         */
                        lpfc_printf_log(phba, KERN_WARNING, LOG_SLI,
                                         "0322 Ring %d handler: "
                                         "unexpected completion IoTag x%x "
                                         "Data: x%x x%x x%x x%x\n",
                                         pring->ringno,
                                         saveq->iocb.ulpIoTag,
                                         saveq->iocb.ulpStatus,
                                         saveq->iocb.un.ulpWord[4],
                                         saveq->iocb.ulpCommand,
                                         saveq->iocb.ulpContext);
                }
        }

        return rc;
}

/**
 * lpfc_sli_rsp_pointers_error - Response ring pointer error handler
 * @phba: Pointer to HBA context object.
 * @pring: Pointer to driver SLI ring object.
 *
 * This function is called from the iocb ring event handlers when
 * put pointer is ahead of the get pointer for a ring. This function signal
 * an error attention condition to the worker thread and the worker
 * thread will transition the HBA to offline state.
 **/
static void
lpfc_sli_rsp_pointers_error(struct lpfc_hba *phba, struct lpfc_sli_ring *pring)
{
        struct lpfc_pgp *pgp = &phba->port_gp[pring->ringno];
        /*
         * Ring <ringno> handler: portRspPut <portRspPut> is bigger than
         * rsp ring <portRspMax>
         */
        lpfc_printf_log(phba, KERN_ERR, LOG_SLI,
                        "0312 Ring %d handler: portRspPut %d "
                        "is bigger than rsp ring %d\n",
                        pring->ringno, le32_to_cpu(pgp->rspPutInx),
                        pring->numRiocb);

        phba->link_state = LPFC_HBA_ERROR;

        /*
         * All error attention handlers are posted to
         * worker thread
         */
        phba->work_ha |= HA_ERATT;
        phba->work_hs = HS_FFER3;

        lpfc_worker_wake_up(phba);

        return;
}

/**
 * lpfc_poll_eratt - Error attention polling timer timeout handler
 * @ptr: Pointer to address of HBA context object.
 *
 * This function is invoked by the Error Attention polling timer when the
 * timer times out. It will check the SLI Error Attention register for
 * possible attention events. If so, it will post an Error Attention event
 * and wake up worker thread to process it. Otherwise, it will set up the
 * Error Attention polling timer for the next poll.
 **/
void lpfc_poll_eratt(unsigned long ptr)
{
        struct lpfc_hba *phba;
        uint32_t eratt = 0;

        phba = (struct lpfc_hba *)ptr;

        /* Check chip HA register for error event */
        eratt = lpfc_sli_check_eratt(phba);

        if (eratt)
                /* Tell the worker thread there is work to do */
                lpfc_worker_wake_up(phba);
        else
                /* Restart the timer for next eratt poll */
                mod_timer(&phba->eratt_poll, jiffies +
                                        HZ * LPFC_ERATT_POLL_INTERVAL);
        return;
}

/**
 * lpfc_sli_poll_fcp_ring - Handle FCP ring completion in polling mode
 * @phba: Pointer to HBA context object.
 *
 * This function is called from lpfc_queuecommand, lpfc_poll_timeout,
 * lpfc_abort_handler and lpfc_slave_configure when FCP_RING_POLLING
 * is enabled.
 *
 * The caller does not hold any lock.
 * The function processes each response iocb in the response ring until it
 * finds an iocb with LE bit set and chains all the iocbs upto the iocb with
 * LE bit set. The function will call the completion handler of the command iocb
 * if the response iocb indicates a completion for a command iocb or it is
 * an abort completion.
 **/
void lpfc_sli_poll_fcp_ring(struct lpfc_hba *phba)
{
        struct lpfc_sli      *psli  = &phba->sli;
        struct lpfc_sli_ring *pring = &psli->ring[LPFC_FCP_RING];
        IOCB_t *irsp = NULL;
        IOCB_t *entry = NULL;
        struct lpfc_iocbq *cmdiocbq = NULL;
        struct lpfc_iocbq rspiocbq;
        struct lpfc_pgp *pgp = &phba->port_gp[pring->ringno];
        uint32_t status;
        uint32_t portRspPut, portRspMax;
        int type;
        uint32_t rsp_cmpl = 0;
        uint32_t ha_copy;
        unsigned long iflags;

        pring->stats.iocb_event++;

        /*
         * The next available response entry should never exceed the maximum
         * entries.  If it does, treat it as an adapter hardware error.
         */
        portRspMax = pring->numRiocb;
        portRspPut = le32_to_cpu(pgp->rspPutInx);
        if (unlikely(portRspPut >= portRspMax)) {
                lpfc_sli_rsp_pointers_error(phba, pring);
                return;
        }

        rmb();
        while (pring->rspidx != portRspPut) {
                entry = lpfc_resp_iocb(phba, pring);
                if (++pring->rspidx >= portRspMax)
                        pring->rspidx = 0;

                lpfc_sli_pcimem_bcopy((uint32_t *) entry,
                                      (uint32_t *) &rspiocbq.iocb,
                                      phba->iocb_rsp_size);
                irsp = &rspiocbq.iocb;
                type = lpfc_sli_iocb_cmd_type(irsp->ulpCommand & CMD_IOCB_MASK);
                pring->stats.iocb_rsp++;
                rsp_cmpl++;

                if (unlikely(irsp->ulpStatus)) {
                        /* Rsp ring <ringno> error: IOCB */
                        lpfc_printf_log(phba, KERN_WARNING, LOG_SLI,
                                        "0326 Rsp Ring %d error: IOCB Data: "
                                        "x%x x%x x%x x%x x%x x%x x%x x%x\n",
                                        pring->ringno,
                                        irsp->un.ulpWord[0],
                                        irsp->un.ulpWord[1],
                                        irsp->un.ulpWord[2],
                                        irsp->un.ulpWord[3],
                                        irsp->un.ulpWord[4],
                                        irsp->un.ulpWord[5],
                                        *(uint32_t *)&irsp->un1,
                                        *((uint32_t *)&irsp->un1 + 1));
                }

                switch (type) {
                case LPFC_ABORT_IOCB:
                case LPFC_SOL_IOCB:
                        /*
                         * Idle exchange closed via ABTS from port.  No iocb
                         * resources need to be recovered.
                         */
                        if (unlikely(irsp->ulpCommand == CMD_XRI_ABORTED_CX)) {
                                lpfc_printf_log(phba, KERN_INFO, LOG_SLI,
                                                "0314 IOCB cmd 0x%x "
                                                "processed. Skipping "
                                                "completion",
                                                irsp->ulpCommand);
                                break;
                        }

                        spin_lock_irqsave(&phba->hbalock, iflags);
                        cmdiocbq = lpfc_sli_iocbq_lookup(phba, pring,
                                                         &rspiocbq);
                        spin_unlock_irqrestore(&phba->hbalock, iflags);
                        if ((cmdiocbq) && (cmdiocbq->iocb_cmpl)) {
                                (cmdiocbq->iocb_cmpl)(phba, cmdiocbq,
                                                      &rspiocbq);
                        }
                        break;
                default:
                        if (irsp->ulpCommand == CMD_ADAPTER_MSG) {
                                char adaptermsg[LPFC_MAX_ADPTMSG];
                                memset(adaptermsg, 0, LPFC_MAX_ADPTMSG);
                                memcpy(&adaptermsg[0], (uint8_t *) irsp,
                                       MAX_MSG_DATA);
                                dev_warn(&((phba->pcidev)->dev),
                                         "lpfc%d: %s\n",
                                         phba->brd_no, adaptermsg);
                        } else {
                                /* Unknown IOCB command */
                                lpfc_printf_log(phba, KERN_ERR, LOG_SLI,
                                                "0321 Unknown IOCB command "
                                                "Data: x%x, x%x x%x x%x x%x\n",
                                                type, irsp->ulpCommand,
                                                irsp->ulpStatus,
                                                irsp->ulpIoTag,
                                                irsp->ulpContext);
                        }
                        break;
                }

                /*
                 * The response IOCB has been processed.  Update the ring
                 * pointer in SLIM.  If the port response put pointer has not
                 * been updated, sync the pgp->rspPutInx and fetch the new port
                 * response put pointer.
                 */
                writel(pring->rspidx, &phba->host_gp[pring->ringno].rspGetInx);

                if (pring->rspidx == portRspPut)
                        portRspPut = le32_to_cpu(pgp->rspPutInx);
        }

        ha_copy = readl(phba->HAregaddr);
        ha_copy >>= (LPFC_FCP_RING * 4);

        if ((rsp_cmpl > 0) && (ha_copy & HA_R0RE_REQ)) {
                spin_lock_irqsave(&phba->hbalock, iflags);
                pring->stats.iocb_rsp_full++;
                status = ((CA_R0ATT | CA_R0RE_RSP) << (LPFC_FCP_RING * 4));
                writel(status, phba->CAregaddr);
                readl(phba->CAregaddr);
                spin_unlock_irqrestore(&phba->hbalock, iflags);
        }
        if ((ha_copy & HA_R0CE_RSP) &&
            (pring->flag & LPFC_CALL_RING_AVAILABLE)) {
                spin_lock_irqsave(&phba->hbalock, iflags);
                pring->flag &= ~LPFC_CALL_RING_AVAILABLE;
                pring->stats.iocb_cmd_empty++;

                /* Force update of the local copy of cmdGetInx */
                pring->local_getidx = le32_to_cpu(pgp->cmdGetInx);
                lpfc_sli_resume_iocb(phba, pring);

                if ((pring->lpfc_sli_cmd_available))
                        (pring->lpfc_sli_cmd_available) (phba, pring);

                spin_unlock_irqrestore(&phba->hbalock, iflags);
        }

        return;
}

/**
 * lpfc_sli_handle_fast_ring_event - Handle ring events on FCP ring
 * @phba: Pointer to HBA context object.
 * @pring: Pointer to driver SLI ring object.
 * @mask: Host attention register mask for this ring.
 *
 * This function is called from the interrupt context when there is a ring
 * event for the fcp ring. The caller does not hold any lock.
 * The function processes each response iocb in the response ring until it
 * finds an iocb with LE bit set and chains all the iocbs upto the iocb with
 * LE bit set. The function will call the completion handler of the command iocb
 * if the response iocb indicates a completion for a command iocb or it is
 * an abort completion. The function will call lpfc_sli_process_unsol_iocb
 * function if this is an unsolicited iocb.
 * This routine presumes LPFC_FCP_RING handling and doesn't bother
 * to check it explicitly. This function always returns 1.
 **/
static int
lpfc_sli_handle_fast_ring_event(struct lpfc_hba *phba,
                                struct lpfc_sli_ring *pring, uint32_t mask)
{
        struct lpfc_pgp *pgp = &phba->port_gp[pring->ringno];
        IOCB_t *irsp = NULL;
        IOCB_t *entry = NULL;
        struct lpfc_iocbq *cmdiocbq = NULL;
        struct lpfc_iocbq rspiocbq;
        uint32_t status;
        uint32_t portRspPut, portRspMax;
        int rc = 1;
        lpfc_iocb_type type;
        unsigned long iflag;
        uint32_t rsp_cmpl = 0;

        spin_lock_irqsave(&phba->hbalock, iflag);
        pring->stats.iocb_event++;

        /*
         * The next available response entry should never exceed the maximum
         * entries.  If it does, treat it as an adapter hardware error.
         */
        portRspMax = pring->numRiocb;
        portRspPut = le32_to_cpu(pgp->rspPutInx);
        if (unlikely(portRspPut >= portRspMax)) {
                lpfc_sli_rsp_pointers_error(phba, pring);
                spin_unlock_irqrestore(&phba->hbalock, iflag);
                return 1;
        }

        rmb();
        while (pring->rspidx != portRspPut) {
                /*
                 * Fetch an entry off the ring and copy it into a local data
                 * structure.  The copy involves a byte-swap since the
                 * network byte order and pci byte orders are different.
                 */
                entry = lpfc_resp_iocb(phba, pring);
                phba->last_completion_time = jiffies;

                if (++pring->rspidx >= portRspMax)
                        pring->rspidx = 0;

                lpfc_sli_pcimem_bcopy((uint32_t *) entry,
                                      (uint32_t *) &rspiocbq.iocb,
                                      phba->iocb_rsp_size);
                INIT_LIST_HEAD(&(rspiocbq.list));
                irsp = &rspiocbq.iocb;

                type = lpfc_sli_iocb_cmd_type(irsp->ulpCommand & CMD_IOCB_MASK);
                pring->stats.iocb_rsp++;
                rsp_cmpl++;

                if (unlikely(irsp->ulpStatus)) {
                        /*
                         * If resource errors reported from HBA, reduce
                         * queuedepths of the SCSI device.
                         */
                        if ((irsp->ulpStatus == IOSTAT_LOCAL_REJECT) &&
                                (irsp->un.ulpWord[4] == IOERR_NO_RESOURCES)) {
                                spin_unlock_irqrestore(&phba->hbalock, iflag);
                                lpfc_rampdown_queue_depth(phba);
                                spin_lock_irqsave(&phba->hbalock, iflag);
                        }

                        /* Rsp ring <ringno> error: IOCB */
                        lpfc_printf_log(phba, KERN_WARNING, LOG_SLI,
                                        "0336 Rsp Ring %d error: IOCB Data: "
                                        "x%x x%x x%x x%x x%x x%x x%x x%x\n",
                                        pring->ringno,
                                        irsp->un.ulpWord[0],
                                        irsp->un.ulpWord[1],
                                        irsp->un.ulpWord[2],
                                        irsp->un.ulpWord[3],
                                        irsp->un.ulpWord[4],
                                        irsp->un.ulpWord[5],
                                        *(uint32_t *)&irsp->un1,
                                        *((uint32_t *)&irsp->un1 + 1));
                }

                switch (type) {
                case LPFC_ABORT_IOCB:
                case LPFC_SOL_IOCB:
                        /*
                         * Idle exchange closed via ABTS from port.  No iocb
                         * resources need to be recovered.
                         */
                        if (unlikely(irsp->ulpCommand == CMD_XRI_ABORTED_CX)) {
                                lpfc_printf_log(phba, KERN_INFO, LOG_SLI,
                                                "0333 IOCB cmd 0x%x"
                                                " processed. Skipping"
                                                " completion\n",
                                                irsp->ulpCommand);
                                break;
                        }

                        cmdiocbq = lpfc_sli_iocbq_lookup(phba, pring,
                                                         &rspiocbq);
                        if ((cmdiocbq) && (cmdiocbq->iocb_cmpl)) {
                                if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
                                        (cmdiocbq->iocb_cmpl)(phba, cmdiocbq,
                                                              &rspiocbq);
                                } else {
                                        spin_unlock_irqrestore(&phba->hbalock,
                                                               iflag);
                                        (cmdiocbq->iocb_cmpl)(phba, cmdiocbq,
                                                              &rspiocbq);
                                        spin_lock_irqsave(&phba->hbalock,
                                                          iflag);
                                }
                        }
                        break;
                case LPFC_UNSOL_IOCB:
                        spin_unlock_irqrestore(&phba->hbalock, iflag);
                        lpfc_sli_process_unsol_iocb(phba, pring, &rspiocbq);
                        spin_lock_irqsave(&phba->hbalock, iflag);
                        break;
                default:
                        if (irsp->ulpCommand == CMD_ADAPTER_MSG) {
                                char adaptermsg[LPFC_MAX_ADPTMSG];
                                memset(adaptermsg, 0, LPFC_MAX_ADPTMSG);
                                memcpy(&adaptermsg[0], (uint8_t *) irsp,
                                       MAX_MSG_DATA);
                                dev_warn(&((phba->pcidev)->dev),
                                         "lpfc%d: %s\n",
                                         phba->brd_no, adaptermsg);
                        } else {
                                /* Unknown IOCB command */
                                lpfc_printf_log(phba, KERN_ERR, LOG_SLI,
                                                "0334 Unknown IOCB command "
                                                "Data: x%x, x%x x%x x%x x%x\n",
                                                type, irsp->ulpCommand,
                                                irsp->ulpStatus,
                                                irsp->ulpIoTag,
                                                irsp->ulpContext);
                        }
                        break;
                }

                /*
                 * The response IOCB has been processed.  Update the ring
                 * pointer in SLIM.  If the port response put pointer has not
                 * been updated, sync the pgp->rspPutInx and fetch the new port
                 * response put pointer.
                 */
                writel(pring->rspidx, &phba->host_gp[pring->ringno].rspGetInx);

                if (pring->rspidx == portRspPut)
                        portRspPut = le32_to_cpu(pgp->rspPutInx);
        }

        if ((rsp_cmpl > 0) && (mask & HA_R0RE_REQ)) {
                pring->stats.iocb_rsp_full++;
                status = ((CA_R0ATT | CA_R0RE_RSP) << (pring->ringno * 4));
                writel(status, phba->CAregaddr);
                readl(phba->CAregaddr);
        }
        if ((mask & HA_R0CE_RSP) && (pring->flag & LPFC_CALL_RING_AVAILABLE)) {
                pring->flag &= ~LPFC_CALL_RING_AVAILABLE;
                pring->stats.iocb_cmd_empty++;

                /* Force update of the local copy of cmdGetInx */
                pring->local_getidx = le32_to_cpu(pgp->cmdGetInx);
                lpfc_sli_resume_iocb(phba, pring);

                if ((pring->lpfc_sli_cmd_available))
                        (pring->lpfc_sli_cmd_available) (phba, pring);

        }

        spin_unlock_irqrestore(&phba->hbalock, iflag);
        return rc;
}

/**
 * lpfc_sli_handle_slow_ring_event - Handle ring events for non-FCP rings
 * @phba: Pointer to HBA context object.
 * @pring: Pointer to driver SLI ring object.
 * @mask: Host attention register mask for this ring.
 *
 * This function is called from the worker thread when there is a ring
 * event for non-fcp rings. The caller does not hold any lock .
 * The function processes each response iocb in the response ring until it
 * finds an iocb with LE bit set and chains all the iocbs upto the iocb with
 * LE bit set. The function will call lpfc_sli_process_sol_iocb function if the
 * response iocb indicates a completion of a command iocb. The function
 * will call lpfc_sli_process_unsol_iocb function if this is an unsolicited
 * iocb. The function frees the resources or calls the completion handler if
 * this iocb is an abort completion. The function returns 0 when the allocated
 * iocbs are not freed, otherwise returns 1.
 **/
int
lpfc_sli_handle_slow_ring_event(struct lpfc_hba *phba,
                                struct lpfc_sli_ring *pring, uint32_t mask)
{
        struct lpfc_pgp *pgp;
        IOCB_t *entry;
        IOCB_t *irsp = NULL;
        struct lpfc_iocbq *rspiocbp = NULL;
        struct lpfc_iocbq *next_iocb;
        struct lpfc_iocbq *cmdiocbp;
        struct lpfc_iocbq *saveq;
        uint8_t iocb_cmd_type;
        lpfc_iocb_type type;
        uint32_t status, free_saveq;
        uint32_t portRspPut, portRspMax;
        int rc = 1;
        unsigned long iflag;

        pgp = &phba->port_gp[pring->ringno];
        spin_lock_irqsave(&phba->hbalock, iflag);
        pring->stats.iocb_event++;

        /*
         * The next available response entry should never exceed the maximum
         * entries.  If it does, treat it as an adapter hardware error.
         */
        portRspMax = pring->numRiocb;
        portRspPut = le32_to_cpu(pgp->rspPutInx);
        if (portRspPut >= portRspMax) {
                /*
                 * Ring <ringno> handler: portRspPut <portRspPut> is bigger than
                 * rsp ring <portRspMax>
                 */
                lpfc_printf_log(phba, KERN_ERR, LOG_SLI,
                                "0303 Ring %d handler: portRspPut %d "
                                "is bigger than rsp ring %d\n",
                                pring->ringno, portRspPut, portRspMax);

                phba->link_state = LPFC_HBA_ERROR;
                spin_unlock_irqrestore(&phba->hbalock, iflag);

                phba->work_hs = HS_FFER3;
                lpfc_handle_eratt(phba);

                return 1;
        }

        rmb();
        while (pring->rspidx != portRspPut) {
                /*
                 * Build a completion list and call the appropriate handler.
                 * The process is to get the next available response iocb, get
                 * a free iocb from the list, copy the response data into the
                 * free iocb, insert to the continuation list, and update the
                 * next response index to slim.  This process makes response
                 * iocb's in the ring available to DMA as fast as possible but
                 * pays a penalty for a copy operation.  Since the iocb is
                 * only 32 bytes, this penalty is considered small relative to
                 * the PCI reads for register values and a slim write.  When
                 * the ulpLe field is set, the entire Command has been
                 * received.
                 */
                entry = lpfc_resp_iocb(phba, pring);

                phba->last_completion_time = jiffies;
                rspiocbp = __lpfc_sli_get_iocbq(phba);
                if (rspiocbp == NULL) {
                        printk(KERN_ERR "%s: out of buffers! Failing "
                               "completion.\n", __func__);
                        break;
                }

                lpfc_sli_pcimem_bcopy(entry, &rspiocbp->iocb,
                                      phba->iocb_rsp_size);
                irsp = &rspiocbp->iocb;

                if (++pring->rspidx >= portRspMax)
                        pring->rspidx = 0;

                if (pring->ringno == LPFC_ELS_RING) {
                        lpfc_debugfs_slow_ring_trc(phba,
                        "IOCB rsp ring:   wd4:x%08x wd6:x%08x wd7:x%08x",
                                *(((uint32_t *) irsp) + 4),
                                *(((uint32_t *) irsp) + 6),
                                *(((uint32_t *) irsp) + 7));
                }

                writel(pring->rspidx, &phba->host_gp[pring->ringno].rspGetInx);

                list_add_tail(&rspiocbp->list, &(pring->iocb_continueq));

                pring->iocb_continueq_cnt++;
                if (irsp->ulpLe) {
                        /*
                         * By default, the driver expects to free all resources
                         * associated with this iocb completion.
                         */
                        free_saveq = 1;
                        saveq = list_get_first(&pring->iocb_continueq,
                                               struct lpfc_iocbq, list);
                        irsp = &(saveq->iocb);
                        list_del_init(&pring->iocb_continueq);
                        pring->iocb_continueq_cnt = 0;

                        pring->stats.iocb_rsp++;

                        /*
                         * If resource errors reported from HBA, reduce
                         * queuedepths of the SCSI device.
                         */
                        if ((irsp->ulpStatus == IOSTAT_LOCAL_REJECT) &&
                             (irsp->un.ulpWord[4] == IOERR_NO_RESOURCES)) {
                                spin_unlock_irqrestore(&phba->hbalock, iflag);
                                lpfc_rampdown_queue_depth(phba);
                                spin_lock_irqsave(&phba->hbalock, iflag);
                        }

                        if (irsp->ulpStatus) {
                                /* Rsp ring <ringno> error: IOCB */
                                lpfc_printf_log(phba, KERN_WARNING, LOG_SLI,
                                                "0328 Rsp Ring %d error: "
                                                "IOCB Data: "
                                                "x%x x%x x%x x%x "
                                                "x%x x%x x%x x%x "
                                                "x%x x%x x%x x%x "
                                                "x%x x%x x%x x%x\n",
                                                pring->ringno,
                                                irsp->un.ulpWord[0],
                                                irsp->un.ulpWord[1],
                                                irsp->un.ulpWord[2],
                                                irsp->un.ulpWord[3],
                                                irsp->un.ulpWord[4],
                                                irsp->un.ulpWord[5],
                                                *(((uint32_t *) irsp) + 6),
                                                *(((uint32_t *) irsp) + 7),
                                                *(((uint32_t *) irsp) + 8),
                                                *(((uint32_t *) irsp) + 9),
                                                *(((uint32_t *) irsp) + 10),
                                                *(((uint32_t *) irsp) + 11),
                                                *(((uint32_t *) irsp) + 12),
                                                *(((uint32_t *) irsp) + 13),
                                                *(((uint32_t *) irsp) + 14),
                                                *(((uint32_t *) irsp) + 15));
                        }

                        /*
                         * Fetch the IOCB command type and call the correct
                         * completion routine.  Solicited and Unsolicited
                         * IOCBs on the ELS ring get freed back to the
                         * lpfc_iocb_list by the discovery kernel thread.
                         */
                        iocb_cmd_type = irsp->ulpCommand & CMD_IOCB_MASK;
                        type = lpfc_sli_iocb_cmd_type(iocb_cmd_type);
                        if (type == LPFC_SOL_IOCB) {
                                spin_unlock_irqrestore(&phba->hbalock, iflag);
                                rc = lpfc_sli_process_sol_iocb(phba, pring,
                                                               saveq);
                                spin_lock_irqsave(&phba->hbalock, iflag);
                        } else if (type == LPFC_UNSOL_IOCB) {
                                spin_unlock_irqrestore(&phba->hbalock, iflag);
                                rc = lpfc_sli_process_unsol_iocb(phba, pring,
                                                                 saveq);
                                spin_lock_irqsave(&phba->hbalock, iflag);
                                if (!rc)
                                        free_saveq = 0;
                        } else if (type == LPFC_ABORT_IOCB) {
                                if ((irsp->ulpCommand != CMD_XRI_ABORTED_CX) &&
                                    ((cmdiocbp =
                                      lpfc_sli_iocbq_lookup(phba, pring,
                                                            saveq)))) {
                                        /* Call the specified completion
                                           routine */
                                        if (cmdiocbp->iocb_cmpl) {
                                                spin_unlock_irqrestore(
                                                       &phba->hbalock,
                                                       iflag);
                                                (cmdiocbp->iocb_cmpl) (phba,
                                                             cmdiocbp, saveq);
                                                spin_lock_irqsave(
                                                          &phba->hbalock,
                                                          iflag);
                                        } else
                                                __lpfc_sli_release_iocbq(phba,
                                                                      cmdiocbp);
                                }
                        } else if (type == LPFC_UNKNOWN_IOCB) {
                                if (irsp->ulpCommand == CMD_ADAPTER_MSG) {

                                        char adaptermsg[LPFC_MAX_ADPTMSG];

                                        memset(adaptermsg, 0,
                                               LPFC_MAX_ADPTMSG);
                                        memcpy(&adaptermsg[0], (uint8_t *) irsp,
                                               MAX_MSG_DATA);
                                        dev_warn(&((phba->pcidev)->dev),
                                                 "lpfc%d: %s\n",
                                                 phba->brd_no, adaptermsg);
                                } else {
                                        /* Unknown IOCB command */
                                        lpfc_printf_log(phba, KERN_ERR, LOG_SLI,
                                                        "0335 Unknown IOCB "
                                                        "command Data: x%x "
                                                        "x%x x%x x%x\n",
                                                        irsp->ulpCommand,
                                                        irsp->ulpStatus,
                                                        irsp->ulpIoTag,
                                                        irsp->ulpContext);
                                }
                        }

                        if (free_saveq) {
                                list_for_each_entry_safe(rspiocbp, next_iocb,
                                                         &saveq->list, list) {
                                        list_del(&rspiocbp->list);
                                        __lpfc_sli_release_iocbq(phba,
                                                                 rspiocbp);
                                }
                                __lpfc_sli_release_iocbq(phba, saveq);
                        }
                        rspiocbp = NULL;
                }

                /*
                 * If the port response put pointer has not been updated, sync
                 * the pgp->rspPutInx in the MAILBOX_tand fetch the new port
                 * response put pointer.
                 */
                if (pring->rspidx == portRspPut) {
                        portRspPut = le32_to_cpu(pgp->rspPutInx);
                }
        } /* while (pring->rspidx != portRspPut) */

        if ((rspiocbp != NULL) && (mask & HA_R0RE_REQ)) {
                /* At least one response entry has been freed */
                pring->stats.iocb_rsp_full++;
                /* SET RxRE_RSP in Chip Att register */
                status = ((CA_R0ATT | CA_R0RE_RSP) << (pring->ringno * 4));
                writel(status, phba->CAregaddr);
                readl(phba->CAregaddr); /* flush */
        }
        if ((mask & HA_R0CE_RSP) && (pring->flag & LPFC_CALL_RING_AVAILABLE)) {
                pring->flag &= ~LPFC_CALL_RING_AVAILABLE;
                pring->stats.iocb_cmd_empty++;

                /* Force update of the local copy of cmdGetInx */
                pring->local_getidx = le32_to_cpu(pgp->cmdGetInx);
                lpfc_sli_resume_iocb(phba, pring);

                if ((pring->lpfc_sli_cmd_available))
                        (pring->lpfc_sli_cmd_available) (phba, pring);

        }

        spin_unlock_irqrestore(&phba->hbalock, iflag);
        return rc;
}

/**
 * lpfc_sli_abort_iocb_ring - Abort all iocbs in the ring
 * @phba: Pointer to HBA context object.
 * @pring: Pointer to driver SLI ring object.
 *
 * This function aborts all iocbs in the given ring and frees all the iocb
 * objects in txq. This function issues an abort iocb for all the iocb commands
 * in txcmplq. The iocbs in the txcmplq is not guaranteed to complete before
 * the return of this function. The caller is not required to hold any locks.
 **/
void
lpfc_sli_abort_iocb_ring(struct lpfc_hba *phba, struct lpfc_sli_ring *pring)
{
        LIST_HEAD(completions);
        struct lpfc_iocbq *iocb, *next_iocb;

        if (pring->ringno == LPFC_ELS_RING) {
                lpfc_fabric_abort_hba(phba);
        }

        /* Error everything on txq and txcmplq
         * First do the txq.
         */
        spin_lock_irq(&phba->hbalock);
        list_splice_init(&pring->txq, &completions);
        pring->txq_cnt = 0;

        /* Next issue ABTS for everything on the txcmplq */
        list_for_each_entry_safe(iocb, next_iocb, &pring->txcmplq, list)
                lpfc_sli_issue_abort_iotag(phba, pring, iocb);

        spin_unlock_irq(&phba->hbalock);

        /* Cancel all the IOCBs from the completions list */
        lpfc_sli_cancel_iocbs(phba, &completions, IOSTAT_LOCAL_REJECT,
                              IOERR_SLI_ABORTED);
}

/**
 * lpfc_sli_flush_fcp_rings - flush all iocbs in the fcp ring
 * @phba: Pointer to HBA context object.
 *
 * This function flushes all iocbs in the fcp ring and frees all the iocb
 * objects in txq and txcmplq. This function will not issue abort iocbs
 * for all the iocb commands in txcmplq, they will just be returned with
 * IOERR_SLI_DOWN. This function is invoked with EEH when device's PCI
 * slot has been permanently disabled.
 **/
void
lpfc_sli_flush_fcp_rings(struct lpfc_hba *phba)
{
        LIST_HEAD(txq);
        LIST_HEAD(txcmplq);
        struct lpfc_sli *psli = &phba->sli;
        struct lpfc_sli_ring  *pring;

        /* Currently, only one fcp ring */
        pring = &psli->ring[psli->fcp_ring];

        spin_lock_irq(&phba->hbalock);
        /* Retrieve everything on txq */
        list_splice_init(&pring->txq, &txq);
        pring->txq_cnt = 0;

        /* Retrieve everything on the txcmplq */
        list_splice_init(&pring->txcmplq, &txcmplq);
        pring->txcmplq_cnt = 0;
        spin_unlock_irq(&phba->hbalock);

        /* Flush the txq */
        lpfc_sli_cancel_iocbs(phba, &txq, IOSTAT_LOCAL_REJECT,
                              IOERR_SLI_DOWN);

        /* Flush the txcmpq */
        lpfc_sli_cancel_iocbs(phba, &txcmplq, IOSTAT_LOCAL_REJECT,
                              IOERR_SLI_DOWN);
}

/**
 * lpfc_sli_brdready - Check for host status bits
 * @phba: Pointer to HBA context object.
 * @mask: Bit mask to be checked.
 *
 * This function reads the host status register and compares
 * with the provided bit mask to check if HBA completed
 * the restart. This function will wait in a loop for the
 * HBA to complete restart. If the HBA does not restart within
 * 15 iterations, the function will reset the HBA again. The
 * function returns 1 when HBA fail to restart otherwise returns
 * zero.
 **/
int
lpfc_sli_brdready(struct lpfc_hba *phba, uint32_t mask)
{
        uint32_t status;
        int i = 0;
        int retval = 0;

        /* Read the HBA Host Status Register */
        status = readl(phba->HSregaddr);

        /*
         * Check status register every 100ms for 5 retries, then every
         * 500ms for 5, then every 2.5 sec for 5, then reset board and
         * every 2.5 sec for 4.
         * Break our of the loop if errors occurred during init.
         */
        while (((status & mask) != mask) &&
               !(status & HS_FFERM) &&
               i++ < 20) {

                if (i <= 5)
                        msleep(10);
                else if (i <= 10)
                        msleep(500);
                else
                        msleep(2500);

                if (i == 15) {
                                /* Do post */
                        phba->pport->port_state = LPFC_VPORT_UNKNOWN;
                        lpfc_sli_brdrestart(phba);
                }
                /* Read the HBA Host Status Register */
                status = readl(phba->HSregaddr);
        }

        /* Check to see if any errors occurred during init */
        if ((status & HS_FFERM) || (i >= 20)) {
                phba->link_state = LPFC_HBA_ERROR;
                retval = 1;
        }

        return retval;
}

#define BARRIER_TEST_PATTERN (0xdeadbeef)

/**
 * lpfc_reset_barrier - Make HBA ready for HBA reset
 * @phba: Pointer to HBA context object.
 *
 * This function is called before resetting an HBA. This
 * function requests HBA to quiesce DMAs before a reset.
 **/
void lpfc_reset_barrier(struct lpfc_hba *phba)
{
        uint32_t __iomem *resp_buf;
        uint32_t __iomem *mbox_buf;
        volatile uint32_t mbox;
        uint32_t hc_copy;
        int  i;
        uint8_t hdrtype;

        pci_read_config_byte(phba->pcidev, PCI_HEADER_TYPE, &hdrtype);
        if (hdrtype != 0x80 ||
            (FC_JEDEC_ID(phba->vpd.rev.biuRev) != HELIOS_JEDEC_ID &&
             FC_JEDEC_ID(phba->vpd.rev.biuRev) != THOR_JEDEC_ID))
                return;

        /*
         * Tell the other part of the chip to suspend temporarily all
         * its DMA activity.
         */
        resp_buf = phba->MBslimaddr;

        /* Disable the error attention */
        hc_copy = readl(phba->HCregaddr);
        writel((hc_copy & ~HC_ERINT_ENA), phba->HCregaddr);
        readl(phba->HCregaddr); /* flush */
        phba->link_flag |= LS_IGNORE_ERATT;

        if (readl(phba->HAregaddr) & HA_ERATT) {
                /* Clear Chip error bit */
                writel(HA_ERATT, phba->HAregaddr);
                phba->pport->stopped = 1;
        }

        mbox = 0;
        ((MAILBOX_t *)&mbox)->mbxCommand = MBX_KILL_BOARD;
        ((MAILBOX_t *)&mbox)->mbxOwner = OWN_CHIP;

        writel(BARRIER_TEST_PATTERN, (resp_buf + 1));
        mbox_buf = phba->MBslimaddr;
        writel(mbox, mbox_buf);

        for (i = 0;
             readl(resp_buf + 1) != ~(BARRIER_TEST_PATTERN) && i < 50; i++)
                mdelay(1);

        if (readl(resp_buf + 1) != ~(BARRIER_TEST_PATTERN)) {
                if (phba->sli.sli_flag & LPFC_SLI2_ACTIVE ||
                    phba->pport->stopped)
                        goto restore_hc;
                else
                        goto clear_errat;
        }

        ((MAILBOX_t *)&mbox)->mbxOwner = OWN_HOST;
        for (i = 0; readl(resp_buf) != mbox &&  i < 500; i++)
                mdelay(1);

clear_errat:

        while (!(readl(phba->HAregaddr) & HA_ERATT) && ++i < 500)
                mdelay(1);

        if (readl(phba->HAregaddr) & HA_ERATT) {
                writel(HA_ERATT, phba->HAregaddr);
                phba->pport->stopped = 1;
        }

restore_hc:
        phba->link_flag &= ~LS_IGNORE_ERATT;
        writel(hc_copy, phba->HCregaddr);
        readl(phba->HCregaddr); /* flush */
}

/**
 * lpfc_sli_brdkill - Issue a kill_board mailbox command
 * @phba: Pointer to HBA context object.
 *
 * This function issues a kill_board mailbox command and waits for
 * the error attention interrupt. This function is called for stopping
 * the firmware processing. The caller is not required to hold any
 * locks. This function calls lpfc_hba_down_post function to free
 * any pending commands after the kill. The function will return 1 when it
 * fails to kill the board else will return 0.
 **/
int
lpfc_sli_brdkill(struct lpfc_hba *phba)
{
        struct lpfc_sli *psli;
        LPFC_MBOXQ_t *pmb;
        uint32_t status;
        uint32_t ha_copy;
        int retval;
        int i = 0;

        psli = &phba->sli;

        /* Kill HBA */
        lpfc_printf_log(phba, KERN_INFO, LOG_SLI,
                        "0329 Kill HBA Data: x%x x%x\n",
                        phba->pport->port_state, psli->sli_flag);

        pmb = (LPFC_MBOXQ_t *) mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
        if (!pmb)
                return 1;

        /* Disable the error attention */
        spin_lock_irq(&phba->hbalock);
        status = readl(phba->HCregaddr);
        status &= ~HC_ERINT_ENA;
        writel(status, phba->HCregaddr);
        readl(phba->HCregaddr); /* flush */
        phba->link_flag |= LS_IGNORE_ERATT;
        spin_unlock_irq(&phba->hbalock);

        lpfc_kill_board(phba, pmb);
        pmb->mbox_cmpl = lpfc_sli_def_mbox_cmpl;
        retval = lpfc_sli_issue_mbox(phba, pmb, MBX_NOWAIT);

        if (retval != MBX_SUCCESS) {
                if (retval != MBX_BUSY)
                        mempool_free(pmb, phba->mbox_mem_pool);
                spin_lock_irq(&phba->hbalock);
                phba->link_flag &= ~LS_IGNORE_ERATT;
                spin_unlock_irq(&phba->hbalock);
                return 1;
        }

        psli->sli_flag &= ~LPFC_SLI2_ACTIVE;

        mempool_free(pmb, phba->mbox_mem_pool);

        /* There is no completion for a KILL_BOARD mbox cmd. Check for an error
         * attention every 100ms for 3 seconds. If we don't get ERATT after
         * 3 seconds we still set HBA_ERROR state because the status of the
         * board is now undefined.
         */
        ha_copy = readl(phba->HAregaddr);

        while ((i++ < 30) && !(ha_copy & HA_ERATT)) {
                mdelay(100);
                ha_copy = readl(phba->HAregaddr);
        }

        del_timer_sync(&psli->mbox_tmo);
        if (ha_copy & HA_ERATT) {
                writel(HA_ERATT, phba->HAregaddr);
                phba->pport->stopped = 1;
        }
        spin_lock_irq(&phba->hbalock);
        psli->sli_flag &= ~LPFC_SLI_MBOX_ACTIVE;
        phba->link_flag &= ~LS_IGNORE_ERATT;
        spin_unlock_irq(&phba->hbalock);

        psli->mbox_active = NULL;
        lpfc_hba_down_post(phba);
        phba->link_state = LPFC_HBA_ERROR;

        return ha_copy & HA_ERATT ? 0 : 1;
}

/**
 * lpfc_sli_brdreset - Reset the HBA
 * @phba: Pointer to HBA context object.
 *
 * This function resets the HBA by writing HC_INITFF to the control
 * register. After the HBA resets, this function resets all the iocb ring
 * indices. This function disables PCI layer parity checking during
 * the reset.
 * This function returns 0 always.
 * The caller is not required to hold any locks.
 **/
int
lpfc_sli_brdreset(struct lpfc_hba *phba)
{
        struct lpfc_sli *psli;
        struct lpfc_sli_ring *pring;
        uint16_t cfg_value;
        int i;

        psli = &phba->sli;

        /* Reset HBA */
        lpfc_printf_log(phba, KERN_INFO, LOG_SLI,
                        "0325 Reset HBA Data: x%x x%x\n",
                        phba->pport->port_state, psli->sli_flag);

        /* perform board reset */
        phba->fc_eventTag = 0;
        phba->pport->fc_myDID = 0;
        phba->pport->fc_prevDID = 0;

        /* Turn off parity checking and serr during the physical reset */
        pci_read_config_word(phba->pcidev, PCI_COMMAND, &cfg_value);
        pci_write_config_word(phba->pcidev, PCI_COMMAND,
                              (cfg_value &
                               ~(PCI_COMMAND_PARITY | PCI_COMMAND_SERR)));

        psli->sli_flag &= ~(LPFC_SLI2_ACTIVE | LPFC_PROCESS_LA);
        /* Now toggle INITFF bit in the Host Control Register */
        writel(HC_INITFF, phba->HCregaddr);
        mdelay(1);
        readl(phba->HCregaddr); /* flush */
        writel(0, phba->HCregaddr);
        readl(phba->HCregaddr); /* flush */

        /* Restore PCI cmd register */
        pci_write_config_word(phba->pcidev, PCI_COMMAND, cfg_value);

        /* Initialize relevant SLI info */
        for (i = 0; i < psli->num_rings; i++) {
                pring = &psli->ring[i];
                pring->flag = 0;
                pring->rspidx = 0;
                pring->next_cmdidx  = 0;
                pring->local_getidx = 0;
                pring->cmdidx = 0;
                pring->missbufcnt = 0;
        }

        phba->link_state = LPFC_WARM_START;
        return 0;
}

/**
 * lpfc_sli_brdrestart - Restart the HBA
 * @phba: Pointer to HBA context object.
 *
 * This function is called in the SLI initialization code path to
 * restart the HBA. The caller is not required to hold any lock.
 * This function writes MBX_RESTART mailbox command to the SLIM and
 * resets the HBA. At the end of the function, it calls lpfc_hba_down_post
 * function to free any pending commands. The function enables
 * POST only during the first initialization. The function returns zero.
 * The function does not guarantee completion of MBX_RESTART mailbox
 * command before the return of this function.
 **/
int
lpfc_sli_brdrestart(struct lpfc_hba *phba)
{
        MAILBOX_t *mb;
        struct lpfc_sli *psli;
        volatile uint32_t word0;
        void __iomem *to_slim;

        spin_lock_irq(&phba->hbalock);

        psli = &phba->sli;

        /* Restart HBA */
        lpfc_printf_log(phba, KERN_INFO, LOG_SLI,
                        "0337 Restart HBA Data: x%x x%x\n",
                        phba->pport->port_state, psli->sli_flag);

        word0 = 0;
        mb = (MAILBOX_t *) &word0;
        mb->mbxCommand = MBX_RESTART;
        mb->mbxHc = 1;

        lpfc_reset_barrier(phba);

        to_slim = phba->MBslimaddr;
        writel(*(uint32_t *) mb, to_slim);
        readl(to_slim); /* flush */

        /* Only skip post after fc_ffinit is completed */
        if (phba->pport->port_state)
                word0 = 1;      /* This is really setting up word1 */
        else
                word0 = 0;      /* This is really setting up word1 */
        to_slim = phba->MBslimaddr + sizeof (uint32_t);
        writel(*(uint32_t *) mb, to_slim);
        readl(to_slim); /* flush */

        lpfc_sli_brdreset(phba);
        phba->pport->stopped = 0;
        phba->link_state = LPFC_INIT_START;

        spin_unlock_irq(&phba->hbalock);

        memset(&psli->lnk_stat_offsets, 0, sizeof(psli->lnk_stat_offsets));
        psli->stats_start = get_seconds();

        /* Give the INITFF and Post time to settle. */
        mdelay(100);

        lpfc_hba_down_post(phba);

        return 0;
}

/**
 * lpfc_sli_chipset_init - Wait for the restart of the HBA after a restart
 * @phba: Pointer to HBA context object.
 *
 * This function is called after a HBA restart to wait for successful
 * restart of the HBA. Successful restart of the HBA is indicated by
 * HS_FFRDY and HS_MBRDY bits. If the HBA fails to restart even after 15
 * iteration, the function will restart the HBA again. The function returns
 * zero if HBA successfully restarted else returns negative error code.
 **/
static int
lpfc_sli_chipset_init(struct lpfc_hba *phba)
{
        uint32_t status, i = 0;

        /* Read the HBA Host Status Register */
        status = readl(phba->HSregaddr);

        /* Check status register to see what current state is */
        i = 0;
        while ((status & (HS_FFRDY | HS_MBRDY)) != (HS_FFRDY | HS_MBRDY)) {

                /* Check every 100ms for 5 retries, then every 500ms for 5, then
                 * every 2.5 sec for 5, then reset board and every 2.5 sec for
                 * 4.
                 */
                if (i++ >= 20) {
                        /* Adapter failed to init, timeout, status reg
                           <status> */
                        lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
                                        "0436 Adapter failed to init, "
                                        "timeout, status reg x%x, "
                                        "FW Data: A8 x%x AC x%x\n", status,
                                        readl(phba->MBslimaddr + 0xa8),
                                        readl(phba->MBslimaddr + 0xac));
                        phba->link_state = LPFC_HBA_ERROR;
                        return -ETIMEDOUT;
                }

                /* Check to see if any errors occurred during init */
                if (status & HS_FFERM) {
                        /* ERROR: During chipset initialization */
                        /* Adapter failed to init, chipset, status reg
                           <status> */
                        lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
                                        "0437 Adapter failed to init, "
                                        "chipset, status reg x%x, "
                                        "FW Data: A8 x%x AC x%x\n", status,
                                        readl(phba->MBslimaddr + 0xa8),
                                        readl(phba->MBslimaddr + 0xac));
                        phba->link_state = LPFC_HBA_ERROR;
                        return -EIO;
                }

                if (i <= 5) {
                        msleep(10);
                } else if (i <= 10) {
                        msleep(500);
                } else {
                        msleep(2500);
                }

                if (i == 15) {
                                /* Do post */
                        phba->pport->port_state = LPFC_VPORT_UNKNOWN;
                        lpfc_sli_brdrestart(phba);
                }
                /* Read the HBA Host Status Register */
                status = readl(phba->HSregaddr);
        }

        /* Check to see if any errors occurred during init */
        if (status & HS_FFERM) {
                /* ERROR: During chipset initialization */
                /* Adapter failed to init, chipset, status reg <status> */
                lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
                                "0438 Adapter failed to init, chipset, "
                                "status reg x%x, "
                                "FW Data: A8 x%x AC x%x\n", status,
                                readl(phba->MBslimaddr + 0xa8),
                                readl(phba->MBslimaddr + 0xac));
                phba->link_state = LPFC_HBA_ERROR;
                return -EIO;
        }

        /* Clear all interrupt enable conditions */
        writel(0, phba->HCregaddr);
        readl(phba->HCregaddr); /* flush */

        /* setup host attn register */
        writel(0xffffffff, phba->HAregaddr);
        readl(phba->HAregaddr); /* flush */
        return 0;
}

/**
 * lpfc_sli_hbq_count - Get the number of HBQs to be configured
 *
 * This function calculates and returns the number of HBQs required to be
 * configured.
 **/
int
lpfc_sli_hbq_count(void)
{
        return ARRAY_SIZE(lpfc_hbq_defs);
}

/**
 * lpfc_sli_hbq_entry_count - Calculate total number of hbq entries
 *
 * This function adds the number of hbq entries in every HBQ to get
 * the total number of hbq entries required for the HBA and returns
 * the total count.
 **/
static int
lpfc_sli_hbq_entry_count(void)
{
        int  hbq_count = lpfc_sli_hbq_count();
        int  count = 0;
        int  i;

        for (i = 0; i < hbq_count; ++i)
                count += lpfc_hbq_defs[i]->entry_count;
        return count;
}

/**
 * lpfc_sli_hbq_size - Calculate memory required for all hbq entries
 *
 * This function calculates amount of memory required for all hbq entries
 * to be configured and returns the total memory required.
 **/
int
lpfc_sli_hbq_size(void)
{
        return lpfc_sli_hbq_entry_count() * sizeof(struct lpfc_hbq_entry);
}

/**
 * lpfc_sli_hbq_setup - configure and initialize HBQs
 * @phba: Pointer to HBA context object.
 *
 * This function is called during the SLI initialization to configure
 * all the HBQs and post buffers to the HBQ. The caller is not
 * required to hold any locks. This function will return zero if successful
 * else it will return negative error code.
 **/
static int
lpfc_sli_hbq_setup(struct lpfc_hba *phba)
{
        int  hbq_count = lpfc_sli_hbq_count();
        LPFC_MBOXQ_t *pmb;
        MAILBOX_t *pmbox;
        uint32_t hbqno;
        uint32_t hbq_entry_index;

                                /* Get a Mailbox buffer to setup mailbox
                                 * commands for HBA initialization
                                 */
        pmb = (LPFC_MBOXQ_t *) mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);

        if (!pmb)
                return -ENOMEM;

        pmbox = &pmb->mb;

        /* Initialize the struct lpfc_sli_hbq structure for each hbq */
        phba->link_state = LPFC_INIT_MBX_CMDS;
        phba->hbq_in_use = 1;

        hbq_entry_index = 0;
        for (hbqno = 0; hbqno < hbq_count; ++hbqno) {
                phba->hbqs[hbqno].next_hbqPutIdx = 0;
                phba->hbqs[hbqno].hbqPutIdx      = 0;
                phba->hbqs[hbqno].local_hbqGetIdx   = 0;
                phba->hbqs[hbqno].entry_count =
                        lpfc_hbq_defs[hbqno]->entry_count;
                lpfc_config_hbq(phba, hbqno, lpfc_hbq_defs[hbqno],
                        hbq_entry_index, pmb);
                hbq_entry_index += phba->hbqs[hbqno].entry_count;

                if (lpfc_sli_issue_mbox(phba, pmb, MBX_POLL) != MBX_SUCCESS) {
                        /* Adapter failed to init, mbxCmd <cmd> CFG_RING,
                           mbxStatus <status>, ring <num> */

                        lpfc_printf_log(phba, KERN_ERR,
                                        LOG_SLI | LOG_VPORT,
                                        "1805 Adapter failed to init. "
                                        "Data: x%x x%x x%x\n",
                                        pmbox->mbxCommand,
                                        pmbox->mbxStatus, hbqno);

                        phba->link_state = LPFC_HBA_ERROR;
                        mempool_free(pmb, phba->mbox_mem_pool);
                        return ENXIO;
                }
        }
        phba->hbq_count = hbq_count;

        mempool_free(pmb, phba->mbox_mem_pool);

        /* Initially populate or replenish the HBQs */
        for (hbqno = 0; hbqno < hbq_count; ++hbqno)
                lpfc_sli_hbqbuf_init_hbqs(phba, hbqno);
        return 0;
}

/**
 * lpfc_sli_config_port - Issue config port mailbox command
 * @phba: Pointer to HBA context object.
 * @sli_mode: sli mode - 2/3
 *
 * This function is called by the sli intialization code path
 * to issue config_port mailbox command. This function restarts the
 * HBA firmware and issues a config_port mailbox command to configure
 * the SLI interface in the sli mode specified by sli_mode
 * variable. The caller is not required to hold any locks.
 * The function returns 0 if successful, else returns negative error
 * code.
 **/
int
lpfc_sli_config_port(struct lpfc_hba *phba, int sli_mode)
{
        LPFC_MBOXQ_t *pmb;
        uint32_t resetcount = 0, rc = 0, done = 0;

        pmb = (LPFC_MBOXQ_t *) mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
        if (!pmb) {
                phba->link_state = LPFC_HBA_ERROR;
                return -ENOMEM;
        }

        phba->sli_rev = sli_mode;
        while (resetcount < 2 && !done) {
                spin_lock_irq(&phba->hbalock);
                phba->sli.sli_flag |= LPFC_SLI_MBOX_ACTIVE;
                spin_unlock_irq(&phba->hbalock);
                phba->pport->port_state = LPFC_VPORT_UNKNOWN;
                lpfc_sli_brdrestart(phba);
                rc = lpfc_sli_chipset_init(phba);
                if (rc)
                        break;

                spin_lock_irq(&phba->hbalock);
                phba->sli.sli_flag &= ~LPFC_SLI_MBOX_ACTIVE;
                spin_unlock_irq(&phba->hbalock);
                resetcount++;

                /* Call pre CONFIG_PORT mailbox command initialization.  A
                 * value of 0 means the call was successful.  Any other
                 * nonzero value is a failure, but if ERESTART is returned,
                 * the driver may reset the HBA and try again.
                 */
                rc = lpfc_config_port_prep(phba);
                if (rc == -ERESTART) {
                        phba->link_state = LPFC_LINK_UNKNOWN;
                        continue;
                } else if (rc)
                        break;
                phba->link_state = LPFC_INIT_MBX_CMDS;
                lpfc_config_port(phba, pmb);
                rc = lpfc_sli_issue_mbox(phba, pmb, MBX_POLL);
                phba->sli3_options &= ~(LPFC_SLI3_NPIV_ENABLED |
                                        LPFC_SLI3_HBQ_ENABLED |
                                        LPFC_SLI3_CRP_ENABLED |
                                        LPFC_SLI3_INB_ENABLED |
                                        LPFC_SLI3_BG_ENABLED);
                if (rc != MBX_SUCCESS) {
                        lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
                                "0442 Adapter failed to init, mbxCmd x%x "
                                "CONFIG_PORT, mbxStatus x%x Data: x%x\n",
                                pmb->mb.mbxCommand, pmb->mb.mbxStatus, 0);
                        spin_lock_irq(&phba->hbalock);
                        phba->sli.sli_flag &= ~LPFC_SLI2_ACTIVE;
                        spin_unlock_irq(&phba->hbalock);
                        rc = -ENXIO;
                } else
                        done = 1;
        }
        if (!done) {
                rc = -EINVAL;
                goto do_prep_failed;
        }
        if (pmb->mb.un.varCfgPort.sli_mode == 3) {
                if (!pmb->mb.un.varCfgPort.cMA) {
                        rc = -ENXIO;
                        goto do_prep_failed;
                }
                if (phba->max_vpi && pmb->mb.un.varCfgPort.gmv) {
                        phba->sli3_options |= LPFC_SLI3_NPIV_ENABLED;
                        phba->max_vpi = pmb->mb.un.varCfgPort.max_vpi;
                } else
                        phba->max_vpi = 0;
                if (pmb->mb.un.varCfgPort.gerbm)
                        phba->sli3_options |= LPFC_SLI3_HBQ_ENABLED;
                if (pmb->mb.un.varCfgPort.gcrp)
                        phba->sli3_options |= LPFC_SLI3_CRP_ENABLED;
                if (pmb->mb.un.varCfgPort.ginb) {
                        phba->sli3_options |= LPFC_SLI3_INB_ENABLED;
                        phba->hbq_get = phba->mbox->us.s3_inb_pgp.hbq_get;
                        phba->port_gp = phba->mbox->us.s3_inb_pgp.port;
                        phba->inb_ha_copy = &phba->mbox->us.s3_inb_pgp.ha_copy;
                        phba->inb_counter = &phba->mbox->us.s3_inb_pgp.counter;
                        phba->inb_last_counter =
                                        phba->mbox->us.s3_inb_pgp.counter;
                } else {
                        phba->hbq_get = phba->mbox->us.s3_pgp.hbq_get;
                        phba->port_gp = phba->mbox->us.s3_pgp.port;
                        phba->inb_ha_copy = NULL;
                        phba->inb_counter = NULL;
                }

                if (phba->cfg_enable_bg) {
                        if (pmb->mb.un.varCfgPort.gbg)
                                phba->sli3_options |= LPFC_SLI3_BG_ENABLED;
                        else
                                lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
                                                "0443 Adapter did not grant "
                                                "BlockGuard\n");
                }
        } else {
                phba->hbq_get = NULL;
                phba->port_gp = phba->mbox->us.s2.port;
                phba->inb_ha_copy = NULL;
                phba->inb_counter = NULL;
                phba->max_vpi = 0;
        }
do_prep_failed:
        mempool_free(pmb, phba->mbox_mem_pool);
        return rc;
}


/**
 * lpfc_sli_hba_setup - SLI intialization function
 * @phba: Pointer to HBA context object.
 *
 * This function is the main SLI intialization function. This function
 * is called by the HBA intialization code, HBA reset code and HBA
 * error attention handler code. Caller is not required to hold any
 * locks. This function issues config_port mailbox command to configure
 * the SLI, setup iocb rings and HBQ rings. In the end the function
 * calls the config_port_post function to issue init_link mailbox
 * command and to start the discovery. The function will return zero
 * if successful, else it will return negative error code.
 **/
int
lpfc_sli_hba_setup(struct lpfc_hba *phba)
{
        uint32_t rc;
        int  mode = 3;

        switch (lpfc_sli_mode) {
        case 2:
                if (phba->cfg_enable_npiv) {
                        lpfc_printf_log(phba, KERN_ERR, LOG_INIT | LOG_VPORT,
                                "1824 NPIV enabled: Override lpfc_sli_mode "
                                "parameter (%d) to auto (0).\n",
                                lpfc_sli_mode);
                        break;
                }
                mode = 2;
                break;
        case 0:
        case 3:
                break;
        default:
                lpfc_printf_log(phba, KERN_ERR, LOG_INIT | LOG_VPORT,
                                "1819 Unrecognized lpfc_sli_mode "
                                "parameter: %d.\n", lpfc_sli_mode);

                break;
        }

        rc = lpfc_sli_config_port(phba, mode);

        if (rc && lpfc_sli_mode == 3)
                lpfc_printf_log(phba, KERN_ERR, LOG_INIT | LOG_VPORT,
                                "1820 Unable to select SLI-3.  "
                                "Not supported by adapter.\n");
        if (rc && mode != 2)
                rc = lpfc_sli_config_port(phba, 2);
        if (rc)
                goto lpfc_sli_hba_setup_error;

        if (phba->sli_rev == 3) {
                phba->iocb_cmd_size = SLI3_IOCB_CMD_SIZE;
                phba->iocb_rsp_size = SLI3_IOCB_RSP_SIZE;
        } else {
                phba->iocb_cmd_size = SLI2_IOCB_CMD_SIZE;
                phba->iocb_rsp_size = SLI2_IOCB_RSP_SIZE;
                phba->sli3_options = 0;
        }

        lpfc_printf_log(phba, KERN_INFO, LOG_INIT,
                        "0444 Firmware in SLI %x mode. Max_vpi %d\n",
                        phba->sli_rev, phba->max_vpi);
        rc = lpfc_sli_ring_map(phba);

        if (rc)
                goto lpfc_sli_hba_setup_error;

        /* Init HBQs */
        if (phba->sli3_options & LPFC_SLI3_HBQ_ENABLED) {
                rc = lpfc_sli_hbq_setup(phba);
                if (rc)
                        goto lpfc_sli_hba_setup_error;
        }

        phba->sli.sli_flag |= LPFC_PROCESS_LA;

        rc = lpfc_config_port_post(phba);
        if (rc)
                goto lpfc_sli_hba_setup_error;

        return rc;

lpfc_sli_hba_setup_error:
        phba->link_state = LPFC_HBA_ERROR;
        lpfc_printf_log(phba, KERN_INFO, LOG_INIT,
                        "0445 Firmware initialization failed\n");
        return rc;
}


/**
 * lpfc_mbox_timeout - Timeout call back function for mbox timer
 * @ptr: context object - pointer to hba structure.
 *
 * This is the callback function for mailbox timer. The mailbox
 * timer is armed when a new mailbox command is issued and the timer
 * is deleted when the mailbox complete. The function is called by
 * the kernel timer code when a mailbox does not complete within
 * expected time. This function wakes up the worker thread to
 * process the mailbox timeout and returns. All the processing is
 * done by the worker thread function lpfc_mbox_timeout_handler.
 **/
void
lpfc_mbox_timeout(unsigned long ptr)
{
        struct lpfc_hba  *phba = (struct lpfc_hba *) ptr;
        unsigned long iflag;
        uint32_t tmo_posted;

        spin_lock_irqsave(&phba->pport->work_port_lock, iflag);
        tmo_posted = phba->pport->work_port_events & WORKER_MBOX_TMO;
        if (!tmo_posted)
                phba->pport->work_port_events |= WORKER_MBOX_TMO;
        spin_unlock_irqrestore(&phba->pport->work_port_lock, iflag);

        if (!tmo_posted)
                lpfc_worker_wake_up(phba);
        return;
}


/**
 * lpfc_mbox_timeout_handler - Worker thread function to handle mailbox timeout
 * @phba: Pointer to HBA context object.
 *
 * This function is called from worker thread when a mailbox command times out.
 * The caller is not required to hold any locks. This function will reset the
 * HBA and recover all the pending commands.
 **/
void
lpfc_mbox_timeout_handler(struct lpfc_hba *phba)
{
        LPFC_MBOXQ_t *pmbox = phba->sli.mbox_active;
        MAILBOX_t *mb = &pmbox->mb;
        struct lpfc_sli *psli = &phba->sli;
        struct lpfc_sli_ring *pring;

        /* Check the pmbox pointer first.  There is a race condition
         * between the mbox timeout handler getting executed in the
         * worklist and the mailbox actually completing. When this
         * race condition occurs, the mbox_active will be NULL.
         */
        spin_lock_irq(&phba->hbalock);
        if (pmbox == NULL) {
                lpfc_printf_log(phba, KERN_WARNING,
                                LOG_MBOX | LOG_SLI,
                                "0353 Active Mailbox cleared - mailbox timeout "
                                "exiting\n");
                spin_unlock_irq(&phba->hbalock);
                return;
        }

        /* Mbox cmd <mbxCommand> timeout */
        lpfc_printf_log(phba, KERN_ERR, LOG_MBOX | LOG_SLI,
                        "0310 Mailbox command x%x timeout Data: x%x x%x x%p\n",
                        mb->mbxCommand,
                        phba->pport->port_state,
                        phba->sli.sli_flag,
                        phba->sli.mbox_active);
        spin_unlock_irq(&phba->hbalock);

        /* Setting state unknown so lpfc_sli_abort_iocb_ring
         * would get IOCB_ERROR from lpfc_sli_issue_iocb, allowing
         * it to fail all oustanding SCSI IO.
         */
        spin_lock_irq(&phba->pport->work_port_lock);
        phba->pport->work_port_events &= ~WORKER_MBOX_TMO;
        spin_unlock_irq(&phba->pport->work_port_lock);
        spin_lock_irq(&phba->hbalock);
        phba->link_state = LPFC_LINK_UNKNOWN;
        psli->sli_flag &= ~LPFC_SLI2_ACTIVE;
        spin_unlock_irq(&phba->hbalock);

        pring = &psli->ring[psli->fcp_ring];
        lpfc_sli_abort_iocb_ring(phba, pring);

        lpfc_printf_log(phba, KERN_ERR, LOG_MBOX | LOG_SLI,
                        "0345 Resetting board due to mailbox timeout\n");
        /*
         * lpfc_offline calls lpfc_sli_hba_down which will clean up
         * on oustanding mailbox commands.
         */
        /* If resets are disabled then set error state and return. */
        if (!phba->cfg_enable_hba_reset) {
                phba->link_state = LPFC_HBA_ERROR;
                return;
        }
        lpfc_offline_prep(phba);
        lpfc_offline(phba);
        lpfc_sli_brdrestart(phba);
        lpfc_online(phba);
        lpfc_unblock_mgmt_io(phba);
        return;
}

/**
 * lpfc_sli_issue_mbox - Issue a mailbox command to firmware
 * @phba: Pointer to HBA context object.
 * @pmbox: Pointer to mailbox object.
 * @flag: Flag indicating how the mailbox need to be processed.
 *
 * This function is called by discovery code and HBA management code
 * to submit a mailbox command to firmware. This function gets the
 * hbalock to protect the data structures.
 * The mailbox command can be submitted in polling mode, in which case
 * this function will wait in a polling loop for the completion of the
 * mailbox.
 * If the mailbox is submitted in no_wait mode (not polling) the
 * function will submit the command and returns immediately without waiting
 * for the mailbox completion. The no_wait is supported only when HBA
 * is in SLI2/SLI3 mode - interrupts are enabled.
 * The SLI interface allows only one mailbox pending at a time. If the
 * mailbox is issued in polling mode and there is already a mailbox
 * pending, then the function will return an error. If the mailbox is issued
 * in NO_WAIT mode and there is a mailbox pending already, the function
 * will return MBX_BUSY after queuing the mailbox into mailbox queue.
 * The sli layer owns the mailbox object until the completion of mailbox
 * command if this function return MBX_BUSY or MBX_SUCCESS. For all other
 * return codes the caller owns the mailbox command after the return of
 * the function.
 **/
int
lpfc_sli_issue_mbox(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmbox, uint32_t flag)
{
        MAILBOX_t *mb;
        struct lpfc_sli *psli = &phba->sli;
        uint32_t status, evtctr;
        uint32_t ha_copy;
        int i;
        unsigned long timeout;
        unsigned long drvr_flag = 0;
        uint32_t word0, ldata;
        void __iomem *to_slim;
        int processing_queue = 0;

        spin_lock_irqsave(&phba->hbalock, drvr_flag);
        if (!pmbox) {
                /* processing mbox queue from intr_handler */
                processing_queue = 1;
                phba->sli.sli_flag &= ~LPFC_SLI_MBOX_ACTIVE;
                pmbox = lpfc_mbox_get(phba);
                if (!pmbox) {
                        spin_unlock_irqrestore(&phba->hbalock, drvr_flag);
                        return MBX_SUCCESS;
                }
        }

        if (pmbox->mbox_cmpl && pmbox->mbox_cmpl != lpfc_sli_def_mbox_cmpl &&
                pmbox->mbox_cmpl != lpfc_sli_wake_mbox_wait) {
                if(!pmbox->vport) {
                        spin_unlock_irqrestore(&phba->hbalock, drvr_flag);
                        lpfc_printf_log(phba, KERN_ERR,
                                        LOG_MBOX | LOG_VPORT,
                                        "1806 Mbox x%x failed. No vport\n",
                                        pmbox->mb.mbxCommand);
                        dump_stack();
                        goto out_not_finished;
                }
        }

        /* If the PCI channel is in offline state, do not post mbox. */
        if (unlikely(pci_channel_offline(phba->pcidev))) {
                spin_unlock_irqrestore(&phba->hbalock, drvr_flag);
                goto out_not_finished;
        }

        /* If HBA has a deferred error attention, fail the iocb. */
        if (unlikely(phba->hba_flag & DEFER_ERATT)) {
                spin_unlock_irqrestore(&phba->hbalock, drvr_flag);
                goto out_not_finished;
        }

        psli = &phba->sli;

        mb = &pmbox->mb;
        status = MBX_SUCCESS;

        if (phba->link_state == LPFC_HBA_ERROR) {
                spin_unlock_irqrestore(&phba->hbalock, drvr_flag);

                /* Mbox command <mbxCommand> cannot issue */
                LOG_MBOX_CANNOT_ISSUE_DATA(phba, pmbox, psli, flag);
                goto out_not_finished;
        }

        if (mb->mbxCommand != MBX_KILL_BOARD && flag & MBX_NOWAIT &&
            !(readl(phba->HCregaddr) & HC_MBINT_ENA)) {
                spin_unlock_irqrestore(&phba->hbalock, drvr_flag);
                LOG_MBOX_CANNOT_ISSUE_DATA(phba, pmbox, psli, flag);
                goto out_not_finished;
        }

        if (psli->sli_flag & LPFC_SLI_MBOX_ACTIVE) {
                /* Polling for a mbox command when another one is already active
                 * is not allowed in SLI. Also, the driver must have established
                 * SLI2 mode to queue and process multiple mbox commands.
                 */

                if (flag & MBX_POLL) {
                        spin_unlock_irqrestore(&phba->hbalock, drvr_flag);

                        /* Mbox command <mbxCommand> cannot issue */
                        LOG_MBOX_CANNOT_ISSUE_DATA(phba, pmbox, psli, flag);
                        goto out_not_finished;
                }

                if (!(psli->sli_flag & LPFC_SLI2_ACTIVE)) {
                        spin_unlock_irqrestore(&phba->hbalock, drvr_flag);
                        /* Mbox command <mbxCommand> cannot issue */
                        LOG_MBOX_CANNOT_ISSUE_DATA(phba, pmbox, psli, flag);
                        goto out_not_finished;
                }

                /* Another mailbox command is still being processed, queue this
                 * command to be processed later.
                 */
                lpfc_mbox_put(phba, pmbox);

                /* Mbox cmd issue - BUSY */
                lpfc_printf_log(phba, KERN_INFO, LOG_MBOX | LOG_SLI,
                                "(%d):0308 Mbox cmd issue - BUSY Data: "
                                "x%x x%x x%x x%x\n",
                                pmbox->vport ? pmbox->vport->vpi : 0xffffff,
                                mb->mbxCommand, phba->pport->port_state,
                                psli->sli_flag, flag);

                psli->slistat.mbox_busy++;
                spin_unlock_irqrestore(&phba->hbalock, drvr_flag);

                if (pmbox->vport) {
                        lpfc_debugfs_disc_trc(pmbox->vport,
                                LPFC_DISC_TRC_MBOX_VPORT,
                                "MBOX Bsy vport:  cmd:x%x mb:x%x x%x",
                                (uint32_t)mb->mbxCommand,
                                mb->un.varWords[0], mb->un.varWords[1]);
                }
                else {
                        lpfc_debugfs_disc_trc(phba->pport,
                                LPFC_DISC_TRC_MBOX,
                                "MBOX Bsy:        cmd:x%x mb:x%x x%x",
                                (uint32_t)mb->mbxCommand,
                                mb->un.varWords[0], mb->un.varWords[1]);
                }

                return MBX_BUSY;
        }

        psli->sli_flag |= LPFC_SLI_MBOX_ACTIVE;

        /* If we are not polling, we MUST be in SLI2 mode */
        if (flag != MBX_POLL) {
                if (!(psli->sli_flag & LPFC_SLI2_ACTIVE) &&
                    (mb->mbxCommand != MBX_KILL_BOARD)) {
                        psli->sli_flag &= ~LPFC_SLI_MBOX_ACTIVE;
                        spin_unlock_irqrestore(&phba->hbalock, drvr_flag);
                        /* Mbox command <mbxCommand> cannot issue */
                        LOG_MBOX_CANNOT_ISSUE_DATA(phba, pmbox, psli, flag);
                        goto out_not_finished;
                }
                /* timeout active mbox command */
                mod_timer(&psli->mbox_tmo, (jiffies +
                               (HZ * lpfc_mbox_tmo_val(phba, mb->mbxCommand))));
        }

        /* Mailbox cmd <cmd> issue */
        lpfc_printf_log(phba, KERN_INFO, LOG_MBOX | LOG_SLI,
                        "(%d):0309 Mailbox cmd x%x issue Data: x%x x%x "
                        "x%x\n",
                        pmbox->vport ? pmbox->vport->vpi : 0,
                        mb->mbxCommand, phba->pport->port_state,
                        psli->sli_flag, flag);

        if (mb->mbxCommand != MBX_HEARTBEAT) {
                if (pmbox->vport) {
                        lpfc_debugfs_disc_trc(pmbox->vport,
                                LPFC_DISC_TRC_MBOX_VPORT,
                                "MBOX Send vport: cmd:x%x mb:x%x x%x",
                                (uint32_t)mb->mbxCommand,
                                mb->un.varWords[0], mb->un.varWords[1]);
                }
                else {
                        lpfc_debugfs_disc_trc(phba->pport,
                                LPFC_DISC_TRC_MBOX,
                                "MBOX Send:       cmd:x%x mb:x%x x%x",
                                (uint32_t)mb->mbxCommand,
                                mb->un.varWords[0], mb->un.varWords[1]);
                }
        }

        psli->slistat.mbox_cmd++;
        evtctr = psli->slistat.mbox_event;

        /* next set own bit for the adapter and copy over command word */
        mb->mbxOwner = OWN_CHIP;

        if (psli->sli_flag & LPFC_SLI2_ACTIVE) {
                /* First copy command data to host SLIM area */
                lpfc_sli_pcimem_bcopy(mb, phba->mbox, MAILBOX_CMD_SIZE);
        } else {
                if (mb->mbxCommand == MBX_CONFIG_PORT) {
                        /* copy command data into host mbox for cmpl */
                        lpfc_sli_pcimem_bcopy(mb, phba->mbox, MAILBOX_CMD_SIZE);
                }

                /* First copy mbox command data to HBA SLIM, skip past first
                   word */
                to_slim = phba->MBslimaddr + sizeof (uint32_t);
                lpfc_memcpy_to_slim(to_slim, &mb->un.varWords[0],
                            MAILBOX_CMD_SIZE - sizeof (uint32_t));

                /* Next copy over first word, with mbxOwner set */
                ldata = *((uint32_t *)mb);
                to_slim = phba->MBslimaddr;
                writel(ldata, to_slim);
                readl(to_slim); /* flush */

                if (mb->mbxCommand == MBX_CONFIG_PORT) {
                        /* switch over to host mailbox */
                        psli->sli_flag |= LPFC_SLI2_ACTIVE;
                }
        }

        wmb();

        switch (flag) {
        case MBX_NOWAIT:
                /* Set up reference to mailbox command */
                psli->mbox_active = pmbox;
                /* Interrupt board to do it */
                writel(CA_MBATT, phba->CAregaddr);
                readl(phba->CAregaddr); /* flush */
                /* Don't wait for it to finish, just return */
                break;

        case MBX_POLL:
                /* Set up null reference to mailbox command */
                psli->mbox_active = NULL;
                /* Interrupt board to do it */
                writel(CA_MBATT, phba->CAregaddr);
                readl(phba->CAregaddr); /* flush */

                if (psli->sli_flag & LPFC_SLI2_ACTIVE) {
                        /* First read mbox status word */
                        word0 = *((uint32_t *)phba->mbox);
                        word0 = le32_to_cpu(word0);
                } else {
                        /* First read mbox status word */
                        word0 = readl(phba->MBslimaddr);
                }

                /* Read the HBA Host Attention Register */
                ha_copy = readl(phba->HAregaddr);
                timeout = msecs_to_jiffies(lpfc_mbox_tmo_val(phba,
                                                             mb->mbxCommand) *
                                           1000) + jiffies;
                i = 0;
                /* Wait for command to complete */
                while (((word0 & OWN_CHIP) == OWN_CHIP) ||
                       (!(ha_copy & HA_MBATT) &&
                        (phba->link_state > LPFC_WARM_START))) {
                        if (time_after(jiffies, timeout)) {
                                psli->sli_flag &= ~LPFC_SLI_MBOX_ACTIVE;
                                spin_unlock_irqrestore(&phba->hbalock,
                                                       drvr_flag);
                                goto out_not_finished;
                        }

                        /* Check if we took a mbox interrupt while we were
                           polling */
                        if (((word0 & OWN_CHIP) != OWN_CHIP)
                            && (evtctr != psli->slistat.mbox_event))
                                break;

                        if (i++ > 10) {
                                spin_unlock_irqrestore(&phba->hbalock,
                                                       drvr_flag);
                                msleep(1);
                                spin_lock_irqsave(&phba->hbalock, drvr_flag);
                        }

                        if (psli->sli_flag & LPFC_SLI2_ACTIVE) {
                                /* First copy command data */
                                word0 = *((uint32_t *)phba->mbox);
                                word0 = le32_to_cpu(word0);
                                if (mb->mbxCommand == MBX_CONFIG_PORT) {
                                        MAILBOX_t *slimmb;
                                        uint32_t slimword0;
                                        /* Check real SLIM for any errors */
                                        slimword0 = readl(phba->MBslimaddr);
                                        slimmb = (MAILBOX_t *) & slimword0;
                                        if (((slimword0 & OWN_CHIP) != OWN_CHIP)
                                            && slimmb->mbxStatus) {
                                                psli->sli_flag &=
                                                    ~LPFC_SLI2_ACTIVE;
                                                word0 = slimword0;
                                        }
                                }
                        } else {
                                /* First copy command data */
                                word0 = readl(phba->MBslimaddr);
                        }
                        /* Read the HBA Host Attention Register */
                        ha_copy = readl(phba->HAregaddr);
                }

                if (psli->sli_flag & LPFC_SLI2_ACTIVE) {
                        /* copy results back to user */
                        lpfc_sli_pcimem_bcopy(phba->mbox, mb, MAILBOX_CMD_SIZE);
                } else {
                        /* First copy command data */
                        lpfc_memcpy_from_slim(mb, phba->MBslimaddr,
                                                        MAILBOX_CMD_SIZE);
                        if ((mb->mbxCommand == MBX_DUMP_MEMORY) &&
                                pmbox->context2) {
                                lpfc_memcpy_from_slim((void *)pmbox->context2,
                                      phba->MBslimaddr + DMP_RSP_OFFSET,
                                                      mb->un.varDmp.word_cnt);
                        }
                }

                writel(HA_MBATT, phba->HAregaddr);
                readl(phba->HAregaddr); /* flush */

                psli->sli_flag &= ~LPFC_SLI_MBOX_ACTIVE;
                status = mb->mbxStatus;
        }

        spin_unlock_irqrestore(&phba->hbalock, drvr_flag);
        return status;

out_not_finished:
        if (processing_queue) {
                pmbox->mb.mbxStatus = MBX_NOT_FINISHED;
                lpfc_mbox_cmpl_put(phba, pmbox);
        }
        return MBX_NOT_FINISHED;
}

/**
 * __lpfc_sli_ringtx_put - Add an iocb to the txq
 * @phba: Pointer to HBA context object.
 * @pring: Pointer to driver SLI ring object.
 * @piocb: Pointer to address of newly added command iocb.
 *
 * This function is called with hbalock held to add a command
 * iocb to the txq when SLI layer cannot submit the command iocb
 * to the ring.
 **/
static void
__lpfc_sli_ringtx_put(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                    struct lpfc_iocbq *piocb)
{
        /* Insert the caller's iocb in the txq tail for later processing. */
        list_add_tail(&piocb->list, &pring->txq);
        pring->txq_cnt++;
}

/**
 * lpfc_sli_next_iocb - Get the next iocb in the txq
 * @phba: Pointer to HBA context object.
 * @pring: Pointer to driver SLI ring object.
 * @piocb: Pointer to address of newly added command iocb.
 *
 * This function is called with hbalock held before a new
 * iocb is submitted to the firmware. This function checks
 * txq to flush the iocbs in txq to Firmware before
 * submitting new iocbs to the Firmware.
 * If there are iocbs in the txq which need to be submitted
 * to firmware, lpfc_sli_next_iocb returns the first element
 * of the txq after dequeuing it from txq.
 * If there is no iocb in the txq then the function will return
 * *piocb and *piocb is set to NULL. Caller needs to check
 * *piocb to find if there are more commands in the txq.
 **/
static struct lpfc_iocbq *
lpfc_sli_next_iocb(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                   struct lpfc_iocbq **piocb)
{
        struct lpfc_iocbq * nextiocb;

        nextiocb = lpfc_sli_ringtx_get(phba, pring);
        if (!nextiocb) {
                nextiocb = *piocb;
                *piocb = NULL;
        }

        return nextiocb;
}

/**
 * __lpfc_sli_issue_iocb - Lockless version of lpfc_sli_issue_iocb
 * @phba: Pointer to HBA context object.
 * @pring: Pointer to driver SLI ring object.
 * @piocb: Pointer to command iocb.
 * @flag: Flag indicating if this command can be put into txq.
 *
 * __lpfc_sli_issue_iocb is used by other functions in the driver
 * to issue an iocb command to the HBA. If the PCI slot is recovering
 * from error state or if HBA is resetting or if LPFC_STOP_IOCB_EVENT
 * flag is turned on, the function returns IOCB_ERROR.
 * When the link is down, this function allows only iocbs for
 * posting buffers.
 * This function finds next available slot in the command ring and
 * posts the command to the available slot and writes the port
 * attention register to request HBA start processing new iocb.
 * If there is no slot available in the ring and
 * flag & SLI_IOCB_RET_IOCB is set, the new iocb is added to the
 * txq, otherwise the function returns IOCB_BUSY.
 *
 * This function is called with hbalock held.
 * The function will return success after it successfully submit the
 * iocb to firmware or after adding to the txq.
 **/
static int
__lpfc_sli_issue_iocb(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                    struct lpfc_iocbq *piocb, uint32_t flag)
{
        struct lpfc_iocbq *nextiocb;
        IOCB_t *iocb;

        if (piocb->iocb_cmpl && (!piocb->vport) &&
           (piocb->iocb.ulpCommand != CMD_ABORT_XRI_CN) &&
           (piocb->iocb.ulpCommand != CMD_CLOSE_XRI_CN)) {
                lpfc_printf_log(phba, KERN_ERR,
                                LOG_SLI | LOG_VPORT,
                                "1807 IOCB x%x failed. No vport\n",
                                piocb->iocb.ulpCommand);
                dump_stack();
                return IOCB_ERROR;
        }


        /* If the PCI channel is in offline state, do not post iocbs. */
        if (unlikely(pci_channel_offline(phba->pcidev)))
                return IOCB_ERROR;

        /* If HBA has a deferred error attention, fail the iocb. */
        if (unlikely(phba->hba_flag & DEFER_ERATT))
                return IOCB_ERROR;

        /*
         * We should never get an IOCB if we are in a < LINK_DOWN state
         */
        if (unlikely(phba->link_state < LPFC_LINK_DOWN))
                return IOCB_ERROR;

        /*
         * Check to see if we are blocking IOCB processing because of a
         * outstanding event.
         */
        if (unlikely(pring->flag & LPFC_STOP_IOCB_EVENT))
                goto iocb_busy;

        if (unlikely(phba->link_state == LPFC_LINK_DOWN)) {
                /*
                 * Only CREATE_XRI, CLOSE_XRI, and QUE_RING_BUF
                 * can be issued if the link is not up.
                 */
                switch (piocb->iocb.ulpCommand) {
                case CMD_GEN_REQUEST64_CR:
                case CMD_GEN_REQUEST64_CX:
                        if (!(phba->sli.sli_flag & LPFC_MENLO_MAINT) ||
                                (piocb->iocb.un.genreq64.w5.hcsw.Rctl !=
                                        FC_FCP_CMND) ||
                                (piocb->iocb.un.genreq64.w5.hcsw.Type !=
                                        MENLO_TRANSPORT_TYPE))

                                goto iocb_busy;
                        break;
                case CMD_QUE_RING_BUF_CN:
                case CMD_QUE_RING_BUF64_CN:
                        /*
                         * For IOCBs, like QUE_RING_BUF, that have no rsp ring
                         * completion, iocb_cmpl MUST be 0.
                         */
                        if (piocb->iocb_cmpl)
                                piocb->iocb_cmpl = NULL;
                        /*FALLTHROUGH*/
                case CMD_CREATE_XRI_CR:
                case CMD_CLOSE_XRI_CN:
                case CMD_CLOSE_XRI_CX:
                        break;
                default:
                        goto iocb_busy;
                }

        /*
         * For FCP commands, we must be in a state where we can process link
         * attention events.
         */
        } else if (unlikely(pring->ringno == phba->sli.fcp_ring &&
                            !(phba->sli.sli_flag & LPFC_PROCESS_LA))) {
                goto iocb_busy;
        }

        while ((iocb = lpfc_sli_next_iocb_slot(phba, pring)) &&
               (nextiocb = lpfc_sli_next_iocb(phba, pring, &piocb)))
                lpfc_sli_submit_iocb(phba, pring, iocb, nextiocb);

        if (iocb)
                lpfc_sli_update_ring(phba, pring);
        else
                lpfc_sli_update_full_ring(phba, pring);

        if (!piocb)
                return IOCB_SUCCESS;

        goto out_busy;

 iocb_busy:
        pring->stats.iocb_cmd_delay++;

 out_busy:

        if (!(flag & SLI_IOCB_RET_IOCB)) {
                __lpfc_sli_ringtx_put(phba, pring, piocb);
                return IOCB_SUCCESS;
        }

        return IOCB_BUSY;
}


/**
 * lpfc_sli_issue_iocb - Wrapper function for __lpfc_sli_issue_iocb
 * @phba: Pointer to HBA context object.
 * @pring: Pointer to driver SLI ring object.
 * @piocb: Pointer to command iocb.
 * @flag: Flag indicating if this command can be put into txq.
 *
 * lpfc_sli_issue_iocb is a wrapper around __lpfc_sli_issue_iocb
 * function. This function gets the hbalock and calls
 * __lpfc_sli_issue_iocb function and will return the error returned
 * by __lpfc_sli_issue_iocb function. This wrapper is used by
 * functions which do not hold hbalock.
 **/
int
lpfc_sli_issue_iocb(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                    struct lpfc_iocbq *piocb, uint32_t flag)
{
        unsigned long iflags;
        int rc;

        spin_lock_irqsave(&phba->hbalock, iflags);
        rc = __lpfc_sli_issue_iocb(phba, pring, piocb, flag);
        spin_unlock_irqrestore(&phba->hbalock, iflags);

        return rc;
}

/**
 * lpfc_extra_ring_setup - Extra ring setup function
 * @phba: Pointer to HBA context object.
 *
 * This function is called while driver attaches with the
 * HBA to setup the extra ring. The extra ring is used
 * only when driver needs to support target mode functionality
 * or IP over FC functionalities.
 *
 * This function is called with no lock held.
 **/
static int
lpfc_extra_ring_setup( struct lpfc_hba *phba)
{
        struct lpfc_sli *psli;
        struct lpfc_sli_ring *pring;

        psli = &phba->sli;

        /* Adjust cmd/rsp ring iocb entries more evenly */

        /* Take some away from the FCP ring */
        pring = &psli->ring[psli->fcp_ring];
        pring->numCiocb -= SLI2_IOCB_CMD_R1XTRA_ENTRIES;
        pring->numRiocb -= SLI2_IOCB_RSP_R1XTRA_ENTRIES;
        pring->numCiocb -= SLI2_IOCB_CMD_R3XTRA_ENTRIES;
        pring->numRiocb -= SLI2_IOCB_RSP_R3XTRA_ENTRIES;

        /* and give them to the extra ring */
        pring = &psli->ring[psli->extra_ring];

        pring->numCiocb += SLI2_IOCB_CMD_R1XTRA_ENTRIES;
        pring->numRiocb += SLI2_IOCB_RSP_R1XTRA_ENTRIES;
        pring->numCiocb += SLI2_IOCB_CMD_R3XTRA_ENTRIES;
        pring->numRiocb += SLI2_IOCB_RSP_R3XTRA_ENTRIES;

        /* Setup default profile for this ring */
        pring->iotag_max = 4096;
        pring->num_mask = 1;
        pring->prt[0].profile = 0;      /* Mask 0 */
        pring->prt[0].rctl = phba->cfg_multi_ring_rctl;
        pring->prt[0].type = phba->cfg_multi_ring_type;
        pring->prt[0].lpfc_sli_rcv_unsol_event = NULL;
        return 0;
}

/**
 * lpfc_sli_async_event_handler - ASYNC iocb handler function
 * @phba: Pointer to HBA context object.
 * @pring: Pointer to driver SLI ring object.
 * @iocbq: Pointer to iocb object.
 *
 * This function is called by the slow ring event handler
 * function when there is an ASYNC event iocb in the ring.
 * This function is called with no lock held.
 * Currently this function handles only temperature related
 * ASYNC events. The function decodes the temperature sensor
 * event message and posts events for the management applications.
 **/
static void
lpfc_sli_async_event_handler(struct lpfc_hba * phba,
        struct lpfc_sli_ring * pring, struct lpfc_iocbq * iocbq)
{
        IOCB_t *icmd;
        uint16_t evt_code;
        uint16_t temp;
        struct temp_event temp_event_data;
        struct Scsi_Host *shost;
        uint32_t *iocb_w;

        icmd = &iocbq->iocb;
        evt_code = icmd->un.asyncstat.evt_code;
        temp = icmd->ulpContext;

        if ((evt_code != ASYNC_TEMP_WARN) &&
                (evt_code != ASYNC_TEMP_SAFE)) {
                iocb_w = (uint32_t *) icmd;
                lpfc_printf_log(phba,
                        KERN_ERR,
                        LOG_SLI,
                        "0346 Ring %d handler: unexpected ASYNC_STATUS"
                        " evt_code 0x%x \n"
                        "W0  0x%08x W1  0x%08x W2  0x%08x W3  0x%08x\n"
                        "W4  0x%08x W5  0x%08x W6  0x%08x W7  0x%08x\n"
                        "W8  0x%08x W9  0x%08x W10 0x%08x W11 0x%08x\n"
                        "W12 0x%08x W13 0x%08x W14 0x%08x W15 0x%08x\n",
                        pring->ringno,
                        icmd->un.asyncstat.evt_code,
                        iocb_w[0], iocb_w[1], iocb_w[2], iocb_w[3],
                        iocb_w[4], iocb_w[5], iocb_w[6], iocb_w[7],
                        iocb_w[8], iocb_w[9], iocb_w[10], iocb_w[11],
                        iocb_w[12], iocb_w[13], iocb_w[14], iocb_w[15]);

                return;
        }
        temp_event_data.data = (uint32_t)temp;
        temp_event_data.event_type = FC_REG_TEMPERATURE_EVENT;
        if (evt_code == ASYNC_TEMP_WARN) {
                temp_event_data.event_code = LPFC_THRESHOLD_TEMP;
                lpfc_printf_log(phba,
                                KERN_ERR,
                                LOG_TEMP,
                                "0347 Adapter is very hot, please take "
                                "corrective action. temperature : %d Celsius\n",
                                temp);
        }
        if (evt_code == ASYNC_TEMP_SAFE) {
                temp_event_data.event_code = LPFC_NORMAL_TEMP;
                lpfc_printf_log(phba,
                                KERN_ERR,
                                LOG_TEMP,
                                "0340 Adapter temperature is OK now. "
                                "temperature : %d Celsius\n",
                                temp);
        }

        /* Send temperature change event to applications */
        shost = lpfc_shost_from_vport(phba->pport);
        fc_host_post_vendor_event(shost, fc_get_event_number(),
                sizeof(temp_event_data), (char *) &temp_event_data,
                LPFC_NL_VENDOR_ID);

}


/**
 * lpfc_sli_setup - SLI ring setup function
 * @phba: Pointer to HBA context object.
 *
 * lpfc_sli_setup sets up rings of the SLI interface with
 * number of iocbs per ring and iotags. This function is
 * called while driver attach to the HBA and before the
 * interrupts are enabled. So there is no need for locking.
 *
 * This function always returns 0.
 **/
int
lpfc_sli_setup(struct lpfc_hba *phba)
{
        int i, totiocbsize = 0;
        struct lpfc_sli *psli = &phba->sli;
        struct lpfc_sli_ring *pring;

        psli->num_rings = MAX_CONFIGURED_RINGS;
        psli->sli_flag = 0;
        psli->fcp_ring = LPFC_FCP_RING;
        psli->next_ring = LPFC_FCP_NEXT_RING;
        psli->extra_ring = LPFC_EXTRA_RING;

        psli->iocbq_lookup = NULL;
        psli->iocbq_lookup_len = 0;
        psli->last_iotag = 0;

        for (i = 0; i < psli->num_rings; i++) {
                pring = &psli->ring[i];
                switch (i) {
                case LPFC_FCP_RING:     /* ring 0 - FCP */
                        /* numCiocb and numRiocb are used in config_port */
                        pring->numCiocb = SLI2_IOCB_CMD_R0_ENTRIES;
                        pring->numRiocb = SLI2_IOCB_RSP_R0_ENTRIES;
                        pring->numCiocb += SLI2_IOCB_CMD_R1XTRA_ENTRIES;
                        pring->numRiocb += SLI2_IOCB_RSP_R1XTRA_ENTRIES;
                        pring->numCiocb += SLI2_IOCB_CMD_R3XTRA_ENTRIES;
                        pring->numRiocb += SLI2_IOCB_RSP_R3XTRA_ENTRIES;
                        pring->sizeCiocb = (phba->sli_rev == 3) ?
                                                        SLI3_IOCB_CMD_SIZE :
                                                        SLI2_IOCB_CMD_SIZE;
                        pring->sizeRiocb = (phba->sli_rev == 3) ?
                                                        SLI3_IOCB_RSP_SIZE :
                                                        SLI2_IOCB_RSP_SIZE;
                        pring->iotag_ctr = 0;
                        pring->iotag_max =
                            (phba->cfg_hba_queue_depth * 2);
                        pring->fast_iotag = pring->iotag_max;
                        pring->num_mask = 0;
                        break;
                case LPFC_EXTRA_RING:   /* ring 1 - EXTRA */
                        /* numCiocb and numRiocb are used in config_port */
                        pring->numCiocb = SLI2_IOCB_CMD_R1_ENTRIES;
                        pring->numRiocb = SLI2_IOCB_RSP_R1_ENTRIES;
                        pring->sizeCiocb = (phba->sli_rev == 3) ?
                                                        SLI3_IOCB_CMD_SIZE :
                                                        SLI2_IOCB_CMD_SIZE;
                        pring->sizeRiocb = (phba->sli_rev == 3) ?
                                                        SLI3_IOCB_RSP_SIZE :
                                                        SLI2_IOCB_RSP_SIZE;
                        pring->iotag_max = phba->cfg_hba_queue_depth;
                        pring->num_mask = 0;
                        break;
                case LPFC_ELS_RING:     /* ring 2 - ELS / CT */
                        /* numCiocb and numRiocb are used in config_port */
                        pring->numCiocb = SLI2_IOCB_CMD_R2_ENTRIES;
                        pring->numRiocb = SLI2_IOCB_RSP_R2_ENTRIES;
                        pring->sizeCiocb = (phba->sli_rev == 3) ?
                                                        SLI3_IOCB_CMD_SIZE :
                                                        SLI2_IOCB_CMD_SIZE;
                        pring->sizeRiocb = (phba->sli_rev == 3) ?
                                                        SLI3_IOCB_RSP_SIZE :
                                                        SLI2_IOCB_RSP_SIZE;
                        pring->fast_iotag = 0;
                        pring->iotag_ctr = 0;
                        pring->iotag_max = 4096;
                        pring->lpfc_sli_rcv_async_status =
                                lpfc_sli_async_event_handler;
                        pring->num_mask = 4;
                        pring->prt[0].profile = 0;      /* Mask 0 */
                        pring->prt[0].rctl = FC_ELS_REQ;
                        pring->prt[0].type = FC_ELS_DATA;
                        pring->prt[0].lpfc_sli_rcv_unsol_event =
                            lpfc_els_unsol_event;
                        pring->prt[1].profile = 0;      /* Mask 1 */
                        pring->prt[1].rctl = FC_ELS_RSP;
                        pring->prt[1].type = FC_ELS_DATA;
                        pring->prt[1].lpfc_sli_rcv_unsol_event =
                            lpfc_els_unsol_event;
                        pring->prt[2].profile = 0;      /* Mask 2 */
                        /* NameServer Inquiry */
                        pring->prt[2].rctl = FC_UNSOL_CTL;
                        /* NameServer */
                        pring->prt[2].type = FC_COMMON_TRANSPORT_ULP;
                        pring->prt[2].lpfc_sli_rcv_unsol_event =
                            lpfc_ct_unsol_event;
                        pring->prt[3].profile = 0;      /* Mask 3 */
                        /* NameServer response */
                        pring->prt[3].rctl = FC_SOL_CTL;
                        /* NameServer */
                        pring->prt[3].type = FC_COMMON_TRANSPORT_ULP;
                        pring->prt[3].lpfc_sli_rcv_unsol_event =
                            lpfc_ct_unsol_event;
                        break;
                }
                totiocbsize += (pring->numCiocb * pring->sizeCiocb) +
                                (pring->numRiocb * pring->sizeRiocb);
        }
        if (totiocbsize > MAX_SLIM_IOCB_SIZE) {
                /* Too many cmd / rsp ring entries in SLI2 SLIM */
                printk(KERN_ERR "%d:0462 Too many cmd / rsp ring entries in "
                       "SLI2 SLIM Data: x%x x%lx\n",
                       phba->brd_no, totiocbsize,
                       (unsigned long) MAX_SLIM_IOCB_SIZE);
        }
        if (phba->cfg_multi_ring_support == 2)
                lpfc_extra_ring_setup(phba);

        return 0;
}

/**
 * lpfc_sli_queue_setup - Queue initialization function
 * @phba: Pointer to HBA context object.
 *
 * lpfc_sli_queue_setup sets up mailbox queues and iocb queues for each
 * ring. This function also initializes ring indices of each ring.
 * This function is called during the initialization of the SLI
 * interface of an HBA.
 * This function is called with no lock held and always returns
 * 1.
 **/
int
lpfc_sli_queue_setup(struct lpfc_hba *phba)
{
        struct lpfc_sli *psli;
        struct lpfc_sli_ring *pring;
        int i;

        psli = &phba->sli;
        spin_lock_irq(&phba->hbalock);
        INIT_LIST_HEAD(&psli->mboxq);
        INIT_LIST_HEAD(&psli->mboxq_cmpl);
        /* Initialize list headers for txq and txcmplq as double linked lists */
        for (i = 0; i < psli->num_rings; i++) {
                pring = &psli->ring[i];
                pring->ringno = i;
                pring->next_cmdidx  = 0;
                pring->local_getidx = 0;
                pring->cmdidx = 0;
                INIT_LIST_HEAD(&pring->txq);
                INIT_LIST_HEAD(&pring->txcmplq);
                INIT_LIST_HEAD(&pring->iocb_continueq);
                INIT_LIST_HEAD(&pring->iocb_continue_saveq);
                INIT_LIST_HEAD(&pring->postbufq);
        }
        spin_unlock_irq(&phba->hbalock);
        return 1;
}

/**
 * lpfc_sli_host_down - Vport cleanup function
 * @vport: Pointer to virtual port object.
 *
 * lpfc_sli_host_down is called to clean up the resources
 * associated with a vport before destroying virtual
 * port data structures.
 * This function does following operations:
 * - Free discovery resources associated with this virtual
 *   port.
 * - Free iocbs associated with this virtual port in
 *   the txq.
 * - Send abort for all iocb commands associated with this
 *   vport in txcmplq.
 *
 * This function is called with no lock held and always returns 1.
 **/
int
lpfc_sli_host_down(struct lpfc_vport *vport)
{
        LIST_HEAD(completions);
        struct lpfc_hba *phba = vport->phba;
        struct lpfc_sli *psli = &phba->sli;
        struct lpfc_sli_ring *pring;
        struct lpfc_iocbq *iocb, *next_iocb;
        int i;
        unsigned long flags = 0;
        uint16_t prev_pring_flag;

        lpfc_cleanup_discovery_resources(vport);

        spin_lock_irqsave(&phba->hbalock, flags);
        for (i = 0; i < psli->num_rings; i++) {
                pring = &psli->ring[i];
                prev_pring_flag = pring->flag;
                /* Only slow rings */
                if (pring->ringno == LPFC_ELS_RING) {
                        pring->flag |= LPFC_DEFERRED_RING_EVENT;
                        /* Set the lpfc data pending flag */
                        set_bit(LPFC_DATA_READY, &phba->data_flags);
                }
                /*
                 * Error everything on the txq since these iocbs have not been
                 * given to the FW yet.
                 */
                list_for_each_entry_safe(iocb, next_iocb, &pring->txq, list) {
                        if (iocb->vport != vport)
                                continue;
                        list_move_tail(&iocb->list, &completions);
                        pring->txq_cnt--;
                }

                /* Next issue ABTS for everything on the txcmplq */
                list_for_each_entry_safe(iocb, next_iocb, &pring->txcmplq,
                                                                        list) {
                        if (iocb->vport != vport)
                                continue;
                        lpfc_sli_issue_abort_iotag(phba, pring, iocb);
                }

                pring->flag = prev_pring_flag;
        }

        spin_unlock_irqrestore(&phba->hbalock, flags);

        /* Cancel all the IOCBs from the completions list */
        lpfc_sli_cancel_iocbs(phba, &completions, IOSTAT_LOCAL_REJECT,
                              IOERR_SLI_DOWN);
        return 1;
}

/**
 * lpfc_sli_hba_down - Resource cleanup function for the HBA
 * @phba: Pointer to HBA context object.
 *
 * This function cleans up all iocb, buffers, mailbox commands
 * while shutting down the HBA. This function is called with no
 * lock held and always returns 1.
 * This function does the following to cleanup driver resources:
 * - Free discovery resources for each virtual port
 * - Cleanup any pending fabric iocbs
 * - Iterate through the iocb txq and free each entry
 *   in the list.
 * - Free up any buffer posted to the HBA
 * - Free mailbox commands in the mailbox queue.
 **/
int
lpfc_sli_hba_down(struct lpfc_hba *phba)
{
        LIST_HEAD(completions);
        struct lpfc_sli *psli = &phba->sli;
        struct lpfc_sli_ring *pring;
        struct lpfc_dmabuf *buf_ptr;
        LPFC_MBOXQ_t *pmb;
        int i;
        unsigned long flags = 0;

        lpfc_hba_down_prep(phba);

        lpfc_fabric_abort_hba(phba);

        spin_lock_irqsave(&phba->hbalock, flags);
        for (i = 0; i < psli->num_rings; i++) {
                pring = &psli->ring[i];
                /* Only slow rings */
                if (pring->ringno == LPFC_ELS_RING) {
                        pring->flag |= LPFC_DEFERRED_RING_EVENT;
                        /* Set the lpfc data pending flag */
                        set_bit(LPFC_DATA_READY, &phba->data_flags);
                }

                /*
                 * Error everything on the txq since these iocbs have not been
                 * given to the FW yet.
                 */
                list_splice_init(&pring->txq, &completions);
                pring->txq_cnt = 0;

        }
        spin_unlock_irqrestore(&phba->hbalock, flags);

        /* Cancel all the IOCBs from the completions list */
        lpfc_sli_cancel_iocbs(phba, &completions, IOSTAT_LOCAL_REJECT,
                              IOERR_SLI_DOWN);

        spin_lock_irqsave(&phba->hbalock, flags);
        list_splice_init(&phba->elsbuf, &completions);
        phba->elsbuf_cnt = 0;
        phba->elsbuf_prev_cnt = 0;
        spin_unlock_irqrestore(&phba->hbalock, flags);

        while (!list_empty(&completions)) {
                list_remove_head(&completions, buf_ptr,
                        struct lpfc_dmabuf, list);
                lpfc_mbuf_free(phba, buf_ptr->virt, buf_ptr->phys);
                kfree(buf_ptr);
        }

        /* Return any active mbox cmds */
        del_timer_sync(&psli->mbox_tmo);
        spin_lock_irqsave(&phba->hbalock, flags);

        spin_lock(&phba->pport->work_port_lock);
        phba->pport->work_port_events &= ~WORKER_MBOX_TMO;
        spin_unlock(&phba->pport->work_port_lock);

        /* Return any pending or completed mbox cmds */
        list_splice_init(&phba->sli.mboxq, &completions);
        if (psli->mbox_active) {
                list_add_tail(&psli->mbox_active->list, &completions);
                psli->mbox_active = NULL;
                psli->sli_flag &= ~LPFC_SLI_MBOX_ACTIVE;
        }
        list_splice_init(&phba->sli.mboxq_cmpl, &completions);
        spin_unlock_irqrestore(&phba->hbalock, flags);

        while (!list_empty(&completions)) {
                list_remove_head(&completions, pmb, LPFC_MBOXQ_t, list);
                pmb->mb.mbxStatus = MBX_NOT_FINISHED;
                if (pmb->mbox_cmpl)
                        pmb->mbox_cmpl(phba,pmb);
        }
        return 1;
}

/**
 * lpfc_sli_pcimem_bcopy - SLI memory copy function
 * @srcp: Source memory pointer.
 * @destp: Destination memory pointer.
 * @cnt: Number of words required to be copied.
 *
 * This function is used for copying data between driver memory
 * and the SLI memory. This function also changes the endianness
 * of each word if native endianness is different from SLI
 * endianness. This function can be called with or without
 * lock.
 **/
void
lpfc_sli_pcimem_bcopy(void *srcp, void *destp, uint32_t cnt)
{
        uint32_t *src = srcp;
        uint32_t *dest = destp;
        uint32_t ldata;
        int i;

        for (i = 0; i < (int)cnt; i += sizeof (uint32_t)) {
                ldata = *src;
                ldata = le32_to_cpu(ldata);
                *dest = ldata;
                src++;
                dest++;
        }
}


/**
 * lpfc_sli_ringpostbuf_put - Function to add a buffer to postbufq
 * @phba: Pointer to HBA context object.
 * @pring: Pointer to driver SLI ring object.
 * @mp: Pointer to driver buffer object.
 *
 * This function is called with no lock held.
 * It always return zero after adding the buffer to the postbufq
 * buffer list.
 **/
int
lpfc_sli_ringpostbuf_put(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                         struct lpfc_dmabuf *mp)
{
        /* Stick struct lpfc_dmabuf at end of postbufq so driver can look it up
           later */
        spin_lock_irq(&phba->hbalock);
        list_add_tail(&mp->list, &pring->postbufq);
        pring->postbufq_cnt++;
        spin_unlock_irq(&phba->hbalock);
        return 0;
}

/**
 * lpfc_sli_get_buffer_tag - allocates a tag for a CMD_QUE_XRI64_CX buffer
 * @phba: Pointer to HBA context object.
 *
 * When HBQ is enabled, buffers are searched based on tags. This function
 * allocates a tag for buffer posted using CMD_QUE_XRI64_CX iocb. The
 * tag is bit wise or-ed with QUE_BUFTAG_BIT to make sure that the tag
 * does not conflict with tags of buffer posted for unsolicited events.
 * The function returns the allocated tag. The function is called with
 * no locks held.
 **/
uint32_t
lpfc_sli_get_buffer_tag(struct lpfc_hba *phba)
{
        spin_lock_irq(&phba->hbalock);
        phba->buffer_tag_count++;
        /*
         * Always set the QUE_BUFTAG_BIT to distiguish between
         * a tag assigned by HBQ.
         */
        phba->buffer_tag_count |= QUE_BUFTAG_BIT;
        spin_unlock_irq(&phba->hbalock);
        return phba->buffer_tag_count;
}

/**
 * lpfc_sli_ring_taggedbuf_get - find HBQ buffer associated with given tag
 * @phba: Pointer to HBA context object.
 * @pring: Pointer to driver SLI ring object.
 * @tag: Buffer tag.
 *
 * Buffers posted using CMD_QUE_XRI64_CX iocb are in pring->postbufq
 * list. After HBA DMA data to these buffers, CMD_IOCB_RET_XRI64_CX
 * iocb is posted to the response ring with the tag of the buffer.
 * This function searches the pring->postbufq list using the tag
 * to find buffer associated with CMD_IOCB_RET_XRI64_CX
 * iocb. If the buffer is found then lpfc_dmabuf object of the
 * buffer is returned to the caller else NULL is returned.
 * This function is called with no lock held.
 **/
struct lpfc_dmabuf *
lpfc_sli_ring_taggedbuf_get(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                        uint32_t tag)
{
        struct lpfc_dmabuf *mp, *next_mp;
        struct list_head *slp = &pring->postbufq;

        /* Search postbufq, from the begining, looking for a match on tag */
        spin_lock_irq(&phba->hbalock);
        list_for_each_entry_safe(mp, next_mp, &pring->postbufq, list) {
                if (mp->buffer_tag == tag) {
                        list_del_init(&mp->list);
                        pring->postbufq_cnt--;
                        spin_unlock_irq(&phba->hbalock);
                        return mp;
                }
        }

        spin_unlock_irq(&phba->hbalock);
        lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
                        "0402 Cannot find virtual addr for buffer tag on "
                        "ring %d Data x%lx x%p x%p x%x\n",
                        pring->ringno, (unsigned long) tag,
                        slp->next, slp->prev, pring->postbufq_cnt);

        return NULL;
}

/**
 * lpfc_sli_ringpostbuf_get - search buffers for unsolicited CT and ELS events
 * @phba: Pointer to HBA context object.
 * @pring: Pointer to driver SLI ring object.
 * @phys: DMA address of the buffer.
 *
 * This function searches the buffer list using the dma_address
 * of unsolicited event to find the driver's lpfc_dmabuf object
 * corresponding to the dma_address. The function returns the
 * lpfc_dmabuf object if a buffer is found else it returns NULL.
 * This function is called by the ct and els unsolicited event
 * handlers to get the buffer associated with the unsolicited
 * event.
 *
 * This function is called with no lock held.
 **/
struct lpfc_dmabuf *
lpfc_sli_ringpostbuf_get(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                         dma_addr_t phys)
{
        struct lpfc_dmabuf *mp, *next_mp;
        struct list_head *slp = &pring->postbufq;

        /* Search postbufq, from the begining, looking for a match on phys */
        spin_lock_irq(&phba->hbalock);
        list_for_each_entry_safe(mp, next_mp, &pring->postbufq, list) {
                if (mp->phys == phys) {
                        list_del_init(&mp->list);
                        pring->postbufq_cnt--;
                        spin_unlock_irq(&phba->hbalock);
                        return mp;
                }
        }

        spin_unlock_irq(&phba->hbalock);
        lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
                        "0410 Cannot find virtual addr for mapped buf on "
                        "ring %d Data x%llx x%p x%p x%x\n",
                        pring->ringno, (unsigned long long)phys,
                        slp->next, slp->prev, pring->postbufq_cnt);
        return NULL;
}

/**
 * lpfc_sli_abort_els_cmpl - Completion handler for the els abort iocbs
 * @phba: Pointer to HBA context object.
 * @cmdiocb: Pointer to driver command iocb object.
 * @rspiocb: Pointer to driver response iocb object.
 *
 * This function is the completion handler for the abort iocbs for
 * ELS commands. This function is called from the ELS ring event
 * handler with no lock held. This function frees memory resources
 * associated with the abort iocb.
 **/
static void
lpfc_sli_abort_els_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                        struct lpfc_iocbq *rspiocb)
{
        IOCB_t *irsp = &rspiocb->iocb;
        uint16_t abort_iotag, abort_context;
        struct lpfc_iocbq *abort_iocb;
        struct lpfc_sli_ring *pring = &phba->sli.ring[LPFC_ELS_RING];

        abort_iocb = NULL;

        if (irsp->ulpStatus) {
                abort_context = cmdiocb->iocb.un.acxri.abortContextTag;
                abort_iotag = cmdiocb->iocb.un.acxri.abortIoTag;

                spin_lock_irq(&phba->hbalock);
                if (abort_iotag != 0 && abort_iotag <= phba->sli.last_iotag)
                        abort_iocb = phba->sli.iocbq_lookup[abort_iotag];

                lpfc_printf_log(phba, KERN_INFO, LOG_ELS | LOG_SLI,
                                "0327 Cannot abort els iocb %p "
                                "with tag %x context %x, abort status %x, "
                                "abort code %x\n",
                                abort_iocb, abort_iotag, abort_context,
                                irsp->ulpStatus, irsp->un.ulpWord[4]);

                /*
                 *  If the iocb is not found in Firmware queue the iocb
                 *  might have completed already. Do not free it again.
                 */
                if (irsp->ulpStatus == IOSTAT_LOCAL_REJECT) {
                        spin_unlock_irq(&phba->hbalock);
                        lpfc_sli_release_iocbq(phba, cmdiocb);
                        return;
                }
                /*
                 * make sure we have the right iocbq before taking it
                 * off the txcmplq and try to call completion routine.
                 */
                if (!abort_iocb ||
                    abort_iocb->iocb.ulpContext != abort_context ||
                    (abort_iocb->iocb_flag & LPFC_DRIVER_ABORTED) == 0)
                        spin_unlock_irq(&phba->hbalock);
                else {
                        list_del_init(&abort_iocb->list);
                        pring->txcmplq_cnt--;
                        spin_unlock_irq(&phba->hbalock);

                        /* Firmware could still be in progress of DMAing
                         * payload, so don't free data buffer till after
                         * a hbeat.
                         */
                        abort_iocb->iocb_flag |= LPFC_DELAY_MEM_FREE;

                        abort_iocb->iocb_flag &= ~LPFC_DRIVER_ABORTED;
                        abort_iocb->iocb.ulpStatus = IOSTAT_LOCAL_REJECT;
                        abort_iocb->iocb.un.ulpWord[4] = IOERR_SLI_ABORTED;
                        (abort_iocb->iocb_cmpl)(phba, abort_iocb, abort_iocb);
                }
        }

        lpfc_sli_release_iocbq(phba, cmdiocb);
        return;
}

/**
 * lpfc_ignore_els_cmpl - Completion handler for aborted ELS command
 * @phba: Pointer to HBA context object.
 * @cmdiocb: Pointer to driver command iocb object.
 * @rspiocb: Pointer to driver response iocb object.
 *
 * The function is called from SLI ring event handler with no
 * lock held. This function is the completion handler for ELS commands
 * which are aborted. The function frees memory resources used for
 * the aborted ELS commands.
 **/
static void
lpfc_ignore_els_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                     struct lpfc_iocbq *rspiocb)
{
        IOCB_t *irsp = &rspiocb->iocb;

        /* ELS cmd tag <ulpIoTag> completes */
        lpfc_printf_log(phba, KERN_INFO, LOG_ELS,
                        "0139 Ignoring ELS cmd tag x%x completion Data: "
                        "x%x x%x x%x\n",
                        irsp->ulpIoTag, irsp->ulpStatus,
                        irsp->un.ulpWord[4], irsp->ulpTimeout);
        if (cmdiocb->iocb.ulpCommand == CMD_GEN_REQUEST64_CR)
                lpfc_ct_free_iocb(phba, cmdiocb);
        else
                lpfc_els_free_iocb(phba, cmdiocb);
        return;
}

/**
 * lpfc_sli_issue_abort_iotag - Abort function for a command iocb
 * @phba: Pointer to HBA context object.
 * @pring: Pointer to driver SLI ring object.
 * @cmdiocb: Pointer to driver command iocb object.
 *
 * This function issues an abort iocb for the provided command
 * iocb. This function is called with hbalock held.
 * The function returns 0 when it fails due to memory allocation
 * failure or when the command iocb is an abort request.
 **/
int
lpfc_sli_issue_abort_iotag(struct lpfc_hba *phba, struct lpfc_sli_ring *pring,
                           struct lpfc_iocbq *cmdiocb)
{
        struct lpfc_vport *vport = cmdiocb->vport;
        struct lpfc_iocbq *abtsiocbp;
        IOCB_t *icmd = NULL;
        IOCB_t *iabt = NULL;
        int retval = IOCB_ERROR;

        /*
         * There are certain command types we don't want to abort.  And we
         * don't want to abort commands that are already in the process of
         * being aborted.
         */
        icmd = &cmdiocb->iocb;
        if (icmd->ulpCommand == CMD_ABORT_XRI_CN ||
            icmd->ulpCommand == CMD_CLOSE_XRI_CN ||
            (cmdiocb->iocb_flag & LPFC_DRIVER_ABORTED) != 0)
                return 0;

        /* If we're unloading, don't abort iocb on the ELS ring, but change the
         * callback so that nothing happens when it finishes.
         */
        if ((vport->load_flag & FC_UNLOADING) &&
            (pring->ringno == LPFC_ELS_RING)) {
                if (cmdiocb->iocb_flag & LPFC_IO_FABRIC)
                        cmdiocb->fabric_iocb_cmpl = lpfc_ignore_els_cmpl;
                else
                        cmdiocb->iocb_cmpl = lpfc_ignore_els_cmpl;
                goto abort_iotag_exit;
        }

        /* issue ABTS for this IOCB based on iotag */
        abtsiocbp = __lpfc_sli_get_iocbq(phba);
        if (abtsiocbp == NULL)
                return 0;

        /* This signals the response to set the correct status
         * before calling the completion handler.
         */
        cmdiocb->iocb_flag |= LPFC_DRIVER_ABORTED;

        iabt = &abtsiocbp->iocb;
        iabt->un.acxri.abortType = ABORT_TYPE_ABTS;
        iabt->un.acxri.abortContextTag = icmd->ulpContext;
        iabt->un.acxri.abortIoTag = icmd->ulpIoTag;
        iabt->ulpLe = 1;
        iabt->ulpClass = icmd->ulpClass;

        if (phba->link_state >= LPFC_LINK_UP)
                iabt->ulpCommand = CMD_ABORT_XRI_CN;
        else
                iabt->ulpCommand = CMD_CLOSE_XRI_CN;

        abtsiocbp->iocb_cmpl = lpfc_sli_abort_els_cmpl;

        lpfc_printf_vlog(vport, KERN_INFO, LOG_SLI,
                         "0339 Abort xri x%x, original iotag x%x, "
                         "abort cmd iotag x%x\n",
                         iabt->un.acxri.abortContextTag,
                         iabt->un.acxri.abortIoTag, abtsiocbp->iotag);
        retval = __lpfc_sli_issue_iocb(phba, pring, abtsiocbp, 0);

        if (retval)
                __lpfc_sli_release_iocbq(phba, abtsiocbp);
abort_iotag_exit:
        /*
         * Caller to this routine should check for IOCB_ERROR
         * and handle it properly.  This routine no longer removes
         * iocb off txcmplq and call compl in case of IOCB_ERROR.
         */
        return retval;
}

/**
 * lpfc_sli_validate_fcp_iocb - find commands associated with a vport or LUN
 * @iocbq: Pointer to driver iocb object.
 * @vport: Pointer to driver virtual port object.
 * @tgt_id: SCSI ID of the target.
 * @lun_id: LUN ID of the scsi device.
 * @ctx_cmd: LPFC_CTX_LUN/LPFC_CTX_TGT/LPFC_CTX_HOST
 *
 * This function acts as an iocb filter for functions which abort or count
 * all FCP iocbs pending on a lun/SCSI target/SCSI host. It will return
 * 0 if the filtering criteria is met for the given iocb and will return
 * 1 if the filtering criteria is not met.
 * If ctx_cmd == LPFC_CTX_LUN, the function returns 0 only if the
 * given iocb is for the SCSI device specified by vport, tgt_id and
 * lun_id parameter.
 * If ctx_cmd == LPFC_CTX_TGT,  the function returns 0 only if the
 * given iocb is for the SCSI target specified by vport and tgt_id
 * parameters.
 * If ctx_cmd == LPFC_CTX_HOST, the function returns 0 only if the
 * given iocb is for the SCSI host associated with the given vport.
 * This function is called with no locks held.
 **/
static int
lpfc_sli_validate_fcp_iocb(struct lpfc_iocbq *iocbq, struct lpfc_vport *vport,
                           uint16_t tgt_id, uint64_t lun_id,
                           lpfc_ctx_cmd ctx_cmd)
{
        struct lpfc_scsi_buf *lpfc_cmd;
        int rc = 1;

        if (!(iocbq->iocb_flag &  LPFC_IO_FCP))
                return rc;

        if (iocbq->vport != vport)
                return rc;

        lpfc_cmd = container_of(iocbq, struct lpfc_scsi_buf, cur_iocbq);

        if (lpfc_cmd->pCmd == NULL)
                return rc;

        switch (ctx_cmd) {
        case LPFC_CTX_LUN:
                if ((lpfc_cmd->rdata->pnode) &&
                    (lpfc_cmd->rdata->pnode->nlp_sid == tgt_id) &&
                    (scsilun_to_int(&lpfc_cmd->fcp_cmnd->fcp_lun) == lun_id))
                        rc = 0;
                break;
        case LPFC_CTX_TGT:
                if ((lpfc_cmd->rdata->pnode) &&
                    (lpfc_cmd->rdata->pnode->nlp_sid == tgt_id))
                        rc = 0;
                break;
        case LPFC_CTX_HOST:
                rc = 0;
                break;
        default:
                printk(KERN_ERR "%s: Unknown context cmd type, value %d\n",
                        __func__, ctx_cmd);
                break;
        }

        return rc;
}

/**
 * lpfc_sli_sum_iocb - Function to count the number of FCP iocbs pending
 * @vport: Pointer to virtual port.
 * @tgt_id: SCSI ID of the target.
 * @lun_id: LUN ID of the scsi device.
 * @ctx_cmd: LPFC_CTX_LUN/LPFC_CTX_TGT/LPFC_CTX_HOST.
 *
 * This function returns number of FCP commands pending for the vport.
 * When ctx_cmd == LPFC_CTX_LUN, the function returns number of FCP
 * commands pending on the vport associated with SCSI device specified
 * by tgt_id and lun_id parameters.
 * When ctx_cmd == LPFC_CTX_TGT, the function returns number of FCP
 * commands pending on the vport associated with SCSI target specified
 * by tgt_id parameter.
 * When ctx_cmd == LPFC_CTX_HOST, the function returns number of FCP
 * commands pending on the vport.
 * This function returns the number of iocbs which satisfy the filter.
 * This function is called without any lock held.
 **/
int
lpfc_sli_sum_iocb(struct lpfc_vport *vport, uint16_t tgt_id, uint64_t lun_id,
                  lpfc_ctx_cmd ctx_cmd)
{
        struct lpfc_hba *phba = vport->phba;
        struct lpfc_iocbq *iocbq;
        int sum, i;

        for (i = 1, sum = 0; i <= phba->sli.last_iotag; i++) {
                iocbq = phba->sli.iocbq_lookup[i];

                if (lpfc_sli_validate_fcp_iocb (iocbq, vport, tgt_id, lun_id,
                                                ctx_cmd) == 0)
                        sum++;
        }

        return sum;
}

/**
 * lpfc_sli_abort_fcp_cmpl - Completion handler function for aborted FCP IOCBs
 * @phba: Pointer to HBA context object
 * @cmdiocb: Pointer to command iocb object.
 * @rspiocb: Pointer to response iocb object.
 *
 * This function is called when an aborted FCP iocb completes. This
 * function is called by the ring event handler with no lock held.
 * This function frees the iocb.
 **/
void
lpfc_sli_abort_fcp_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
                        struct lpfc_iocbq *rspiocb)
{
        lpfc_sli_release_iocbq(phba, cmdiocb);
        return;
}

/**
 * lpfc_sli_abort_iocb - issue abort for all commands on a host/target/LUN
 * @vport: Pointer to virtual port.
 * @pring: Pointer to driver SLI ring object.
 * @tgt_id: SCSI ID of the target.
 * @lun_id: LUN ID of the scsi device.
 * @abort_cmd: LPFC_CTX_LUN/LPFC_CTX_TGT/LPFC_CTX_HOST.
 *
 * This function sends an abort command for every SCSI command
 * associated with the given virtual port pending on the ring
 * filtered by lpfc_sli_validate_fcp_iocb function.
 * When abort_cmd == LPFC_CTX_LUN, the function sends abort only to the
 * FCP iocbs associated with lun specified by tgt_id and lun_id
 * parameters
 * When abort_cmd == LPFC_CTX_TGT, the function sends abort only to the
 * FCP iocbs associated with SCSI target specified by tgt_id parameter.
 * When abort_cmd == LPFC_CTX_HOST, the function sends abort to all
 * FCP iocbs associated with virtual port.
 * This function returns number of iocbs it failed to abort.
 * This function is called with no locks held.
 **/
int
lpfc_sli_abort_iocb(struct lpfc_vport *vport, struct lpfc_sli_ring *pring,
                    uint16_t tgt_id, uint64_t lun_id, lpfc_ctx_cmd abort_cmd)
{
        struct lpfc_hba *phba = vport->phba;
        struct lpfc_iocbq *iocbq;
        struct lpfc_iocbq *abtsiocb;
        IOCB_t *cmd = NULL;
        int errcnt = 0, ret_val = 0;
        int i;

        for (i = 1; i <= phba->sli.last_iotag; i++) {
                iocbq = phba->sli.iocbq_lookup[i];

                if (lpfc_sli_validate_fcp_iocb(iocbq, vport, tgt_id, lun_id,
                                               abort_cmd) != 0)
                        continue;

                /* issue ABTS for this IOCB based on iotag */
                abtsiocb = lpfc_sli_get_iocbq(phba);
                if (abtsiocb == NULL) {
                        errcnt++;
                        continue;
                }

                cmd = &iocbq->iocb;
                abtsiocb->iocb.un.acxri.abortType = ABORT_TYPE_ABTS;
                abtsiocb->iocb.un.acxri.abortContextTag = cmd->ulpContext;
                abtsiocb->iocb.un.acxri.abortIoTag = cmd->ulpIoTag;
                abtsiocb->iocb.ulpLe = 1;
                abtsiocb->iocb.ulpClass = cmd->ulpClass;
                abtsiocb->vport = phba->pport;

                if (lpfc_is_link_up(phba))
                        abtsiocb->iocb.ulpCommand = CMD_ABORT_XRI_CN;
                else
                        abtsiocb->iocb.ulpCommand = CMD_CLOSE_XRI_CN;

                /* Setup callback routine and issue the command. */
                abtsiocb->iocb_cmpl = lpfc_sli_abort_fcp_cmpl;
                ret_val = lpfc_sli_issue_iocb(phba, pring, abtsiocb, 0);
                if (ret_val == IOCB_ERROR) {
                        lpfc_sli_release_iocbq(phba, abtsiocb);
                        errcnt++;
                        continue;
                }
        }

        return errcnt;
}

/**
 * lpfc_sli_wake_iocb_wait - lpfc_sli_issue_iocb_wait's completion handler
 * @phba: Pointer to HBA context object.
 * @cmdiocbq: Pointer to command iocb.
 * @rspiocbq: Pointer to response iocb.
 *
 * This function is the completion handler for iocbs issued using
 * lpfc_sli_issue_iocb_wait function. This function is called by the
 * ring event handler function without any lock held. This function
 * can be called from both worker thread context and interrupt
 * context. This function also can be called from other thread which
 * cleans up the SLI layer objects.
 * This function copy the contents of the response iocb to the
 * response iocb memory object provided by the caller of
 * lpfc_sli_issue_iocb_wait and then wakes up the thread which
 * sleeps for the iocb completion.
 **/
static void
lpfc_sli_wake_iocb_wait(struct lpfc_hba *phba,
                        struct lpfc_iocbq *cmdiocbq,
                        struct lpfc_iocbq *rspiocbq)
{
        wait_queue_head_t *pdone_q;
        unsigned long iflags;

        spin_lock_irqsave(&phba->hbalock, iflags);
        cmdiocbq->iocb_flag |= LPFC_IO_WAKE;
        if (cmdiocbq->context2 && rspiocbq)
                memcpy(&((struct lpfc_iocbq *)cmdiocbq->context2)->iocb,
                       &rspiocbq->iocb, sizeof(IOCB_t));

        pdone_q = cmdiocbq->context_un.wait_queue;
        if (pdone_q)
                wake_up(pdone_q);
        spin_unlock_irqrestore(&phba->hbalock, iflags);
        return;
}

/**
 * lpfc_sli_issue_iocb_wait - Synchronous function to issue iocb commands
 * @phba: Pointer to HBA context object..
 * @pring: Pointer to sli ring.
 * @piocb: Pointer to command iocb.
 * @prspiocbq: Pointer to response iocb.
 * @timeout: Timeout in number of seconds.
 *
 * This function issues the iocb to firmware and waits for the
 * iocb to complete. If the iocb command is not
 * completed within timeout seconds, it returns IOCB_TIMEDOUT.
 * Caller should not free the iocb resources if this function
 * returns IOCB_TIMEDOUT.
 * The function waits for the iocb completion using an
 * non-interruptible wait.
 * This function will sleep while waiting for iocb completion.
 * So, this function should not be called from any context which
 * does not allow sleeping. Due to the same reason, this function
 * cannot be called with interrupt disabled.
 * This function assumes that the iocb completions occur while
 * this function sleep. So, this function cannot be called from
 * the thread which process iocb completion for this ring.
 * This function clears the iocb_flag of the iocb object before
 * issuing the iocb and the iocb completion handler sets this
 * flag and wakes this thread when the iocb completes.
 * The contents of the response iocb will be copied to prspiocbq
 * by the completion handler when the command completes.
 * This function returns IOCB_SUCCESS when success.
 * This function is called with no lock held.
 **/
int
lpfc_sli_issue_iocb_wait(struct lpfc_hba *phba,
                         struct lpfc_sli_ring *pring,
                         struct lpfc_iocbq *piocb,
                         struct lpfc_iocbq *prspiocbq,
                         uint32_t timeout)
{
        DECLARE_WAIT_QUEUE_HEAD_ONSTACK(done_q);
        long timeleft, timeout_req = 0;
        int retval = IOCB_SUCCESS;
        uint32_t creg_val;

        /*
         * If the caller has provided a response iocbq buffer, then context2
         * is NULL or its an error.
         */
        if (prspiocbq) {
                if (piocb->context2)
                        return IOCB_ERROR;
                piocb->context2 = prspiocbq;
        }

        piocb->iocb_cmpl = lpfc_sli_wake_iocb_wait;
        piocb->context_un.wait_queue = &done_q;
        piocb->iocb_flag &= ~LPFC_IO_WAKE;

        if (phba->cfg_poll & DISABLE_FCP_RING_INT) {
                creg_val = readl(phba->HCregaddr);
                creg_val |= (HC_R0INT_ENA << LPFC_FCP_RING);
                writel(creg_val, phba->HCregaddr);
                readl(phba->HCregaddr); /* flush */
        }

        retval = lpfc_sli_issue_iocb(phba, pring, piocb, 0);
        if (retval == IOCB_SUCCESS) {
                timeout_req = timeout * HZ;
                timeleft = wait_event_timeout(done_q,
                                piocb->iocb_flag & LPFC_IO_WAKE,
                                timeout_req);

                if (piocb->iocb_flag & LPFC_IO_WAKE) {
                        lpfc_printf_log(phba, KERN_INFO, LOG_SLI,
                                        "0331 IOCB wake signaled\n");
                } else if (timeleft == 0) {
                        lpfc_printf_log(phba, KERN_ERR, LOG_SLI,
                                        "0338 IOCB wait timeout error - no "
                                        "wake response Data x%x\n", timeout);
                        retval = IOCB_TIMEDOUT;
                } else {
                        lpfc_printf_log(phba, KERN_ERR, LOG_SLI,
                                        "0330 IOCB wake NOT set, "
                                        "Data x%x x%lx\n",
                                        timeout, (timeleft / jiffies));
                        retval = IOCB_TIMEDOUT;
                }
        } else {
                lpfc_printf_log(phba, KERN_INFO, LOG_SLI,
                                "0332 IOCB wait issue failed, Data x%x\n",
                                retval);
                retval = IOCB_ERROR;
        }

        if (phba->cfg_poll & DISABLE_FCP_RING_INT) {
                creg_val = readl(phba->HCregaddr);
                creg_val &= ~(HC_R0INT_ENA << LPFC_FCP_RING);
                writel(creg_val, phba->HCregaddr);
                readl(phba->HCregaddr); /* flush */
        }

        if (prspiocbq)
                piocb->context2 = NULL;

        piocb->context_un.wait_queue = NULL;
        piocb->iocb_cmpl = NULL;
        return retval;
}

/**
 * lpfc_sli_issue_mbox_wait - Synchronous function to issue mailbox
 * @phba: Pointer to HBA context object.
 * @pmboxq: Pointer to driver mailbox object.
 * @timeout: Timeout in number of seconds.
 *
 * This function issues the mailbox to firmware and waits for the
 * mailbox command to complete. If the mailbox command is not
 * completed within timeout seconds, it returns MBX_TIMEOUT.
 * The function waits for the mailbox completion using an
 * interruptible wait. If the thread is woken up due to a
 * signal, MBX_TIMEOUT error is returned to the caller. Caller
 * should not free the mailbox resources, if this function returns
 * MBX_TIMEOUT.
 * This function will sleep while waiting for mailbox completion.
 * So, this function should not be called from any context which
 * does not allow sleeping. Due to the same reason, this function
 * cannot be called with interrupt disabled.
 * This function assumes that the mailbox completion occurs while
 * this function sleep. So, this function cannot be called from
 * the worker thread which processes mailbox completion.
 * This function is called in the context of HBA management
 * applications.
 * This function returns MBX_SUCCESS when successful.
 * This function is called with no lock held.
 **/
int
lpfc_sli_issue_mbox_wait(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmboxq,
                         uint32_t timeout)
{
        DECLARE_WAIT_QUEUE_HEAD_ONSTACK(done_q);
        int retval;
        unsigned long flag;

        /* The caller must leave context1 empty. */
        if (pmboxq->context1)
                return MBX_NOT_FINISHED;

        pmboxq->mbox_flag &= ~LPFC_MBX_WAKE;
        /* setup wake call as IOCB callback */
        pmboxq->mbox_cmpl = lpfc_sli_wake_mbox_wait;
        /* setup context field to pass wait_queue pointer to wake function  */
        pmboxq->context1 = &done_q;

        /* now issue the command */
        retval = lpfc_sli_issue_mbox(phba, pmboxq, MBX_NOWAIT);

        if (retval == MBX_BUSY || retval == MBX_SUCCESS) {
                wait_event_interruptible_timeout(done_q,
                                pmboxq->mbox_flag & LPFC_MBX_WAKE,
                                timeout * HZ);

                spin_lock_irqsave(&phba->hbalock, flag);
                pmboxq->context1 = NULL;
                /*
                 * if LPFC_MBX_WAKE flag is set the mailbox is completed
                 * else do not free the resources.
                 */
                if (pmboxq->mbox_flag & LPFC_MBX_WAKE)
                        retval = MBX_SUCCESS;
                else {
                        retval = MBX_TIMEOUT;
                        pmboxq->mbox_cmpl = lpfc_sli_def_mbox_cmpl;
                }
                spin_unlock_irqrestore(&phba->hbalock, flag);
        }

        return retval;
}

/**
 * lpfc_sli_flush_mbox_queue - mailbox queue cleanup function
 * @phba: Pointer to HBA context.
 *
 * This function is called to cleanup any pending mailbox
 * objects in the driver queue before bringing the HBA offline.
 * This function is called while resetting the HBA.
 * The function is called without any lock held. The function
 * takes hbalock to update SLI data structure.
 * This function returns 1 when there is an active mailbox
 * command pending else returns 0.
 **/
int
lpfc_sli_flush_mbox_queue(struct lpfc_hba * phba)
{
        struct lpfc_vport *vport = phba->pport;
        int i = 0;
        uint32_t ha_copy;

        while (phba->sli.sli_flag & LPFC_SLI_MBOX_ACTIVE && !vport->stopped) {
                if (i++ > LPFC_MBOX_TMO * 1000)
                        return 1;

                /*
                 * Call lpfc_sli_handle_mb_event only if a mailbox cmd
                 * did finish. This way we won't get the misleading
                 * "Stray Mailbox Interrupt" message.
                 */
                spin_lock_irq(&phba->hbalock);
                ha_copy = phba->work_ha;
                phba->work_ha &= ~HA_MBATT;
                spin_unlock_irq(&phba->hbalock);

                if (ha_copy & HA_MBATT)
                        if (lpfc_sli_handle_mb_event(phba) == 0)
                                i = 0;

                msleep(1);
        }

        return (phba->sli.sli_flag & LPFC_SLI_MBOX_ACTIVE) ? 1 : 0;
}

/**
 * lpfc_sli_check_eratt - check error attention events
 * @phba: Pointer to HBA context.
 *
 * This function is called form timer soft interrupt context to check HBA's
 * error attention register bit for error attention events.
 *
 * This fucntion returns 1 when there is Error Attention in the Host Attention
 * Register and returns 0 otherwise.
 **/
int
lpfc_sli_check_eratt(struct lpfc_hba *phba)
{
        uint32_t ha_copy;

        /* If PCI channel is offline, don't process it */
        if (unlikely(pci_channel_offline(phba->pcidev)))
                return 0;

        /* If somebody is waiting to handle an eratt, don't process it
         * here. The brdkill function will do this.
         */
        if (phba->link_flag & LS_IGNORE_ERATT)
                return 0;

        /* Check if interrupt handler handles this ERATT */
        spin_lock_irq(&phba->hbalock);
        if (phba->hba_flag & HBA_ERATT_HANDLED) {
                /* Interrupt handler has handled ERATT */
                spin_unlock_irq(&phba->hbalock);
                return 0;
        }

        /*
         * If there is deferred error attention, do not check for error
         * attention
         */
        if (unlikely(phba->hba_flag & DEFER_ERATT)) {
                spin_unlock_irq(&phba->hbalock);
                return 0;
        }

        /* Read chip Host Attention (HA) register */
        ha_copy = readl(phba->HAregaddr);
        if (ha_copy & HA_ERATT) {
                /* Read host status register to retrieve error event */
                lpfc_sli_read_hs(phba);

                /* Check if there is a deferred error condition is active */
                if ((HS_FFER1 & phba->work_hs) &&
                        ((HS_FFER2 | HS_FFER3 | HS_FFER4 | HS_FFER5 |
                        HS_FFER6 | HS_FFER7) & phba->work_hs)) {
                        phba->hba_flag |= DEFER_ERATT;
                        /* Clear all interrupt enable conditions */
                        writel(0, phba->HCregaddr);
                        readl(phba->HCregaddr);
                }

                /* Set the driver HA work bitmap */
                phba->work_ha |= HA_ERATT;
                /* Indicate polling handles this ERATT */
                phba->hba_flag |= HBA_ERATT_HANDLED;
                spin_unlock_irq(&phba->hbalock);
                return 1;
        }
        spin_unlock_irq(&phba->hbalock);
        return 0;
}

/**
 * lpfc_sp_intr_handler - The slow-path interrupt handler of lpfc driver
 * @irq: Interrupt number.
 * @dev_id: The device context pointer.
 *
 * This function is directly called from the PCI layer as an interrupt
 * service routine when the device is enabled with MSI-X multi-message
 * interrupt mode and there are slow-path events in the HBA. However,
 * when the device is enabled with either MSI or Pin-IRQ interrupt mode,
 * this function is called as part of the device-level interrupt handler.
 * When the PCI slot is in error recovery or the HBA is undergoing
 * initialization, the interrupt handler will not process the interrupt.
 * The link attention and ELS ring attention events are handled by the
 * worker thread. The interrupt handler signals the worker thread and
 * and returns for these events. This function is called without any
 * lock held. It gets the hbalock to access and update SLI data
 * structures.
 *
 * This function returns IRQ_HANDLED when interrupt is handled else it
 * returns IRQ_NONE.
 **/
irqreturn_t
lpfc_sp_intr_handler(int irq, void *dev_id)
{
        struct lpfc_hba  *phba;
        uint32_t ha_copy;
        uint32_t work_ha_copy;
        unsigned long status;
        unsigned long iflag;
        uint32_t control;

        MAILBOX_t *mbox, *pmbox;
        struct lpfc_vport *vport;
        struct lpfc_nodelist *ndlp;
        struct lpfc_dmabuf *mp;
        LPFC_MBOXQ_t *pmb;
        int rc;

        /*
         * Get the driver's phba structure from the dev_id and
         * assume the HBA is not interrupting.
         */
        phba = (struct lpfc_hba *)dev_id;

        if (unlikely(!phba))
                return IRQ_NONE;

        /*
         * Stuff needs to be attented to when this function is invoked as an
         * individual interrupt handler in MSI-X multi-message interrupt mode
         */
        if (phba->intr_type == MSIX) {
                /* If the pci channel is offline, ignore all the interrupts */
                if (unlikely(pci_channel_offline(phba->pcidev)))
                        return IRQ_NONE;
                /* Update device-level interrupt statistics */
                phba->sli.slistat.sli_intr++;
                /* Ignore all interrupts during initialization. */
                if (unlikely(phba->link_state < LPFC_LINK_DOWN))
                        return IRQ_NONE;
                /* Need to read HA REG for slow-path events */
                spin_lock_irqsave(&phba->hbalock, iflag);
                ha_copy = readl(phba->HAregaddr);
                /* If somebody is waiting to handle an eratt don't process it
                 * here. The brdkill function will do this.
                 */
                if (phba->link_flag & LS_IGNORE_ERATT)
                        ha_copy &= ~HA_ERATT;
                /* Check the need for handling ERATT in interrupt handler */
                if (ha_copy & HA_ERATT) {
                        if (phba->hba_flag & HBA_ERATT_HANDLED)
                                /* ERATT polling has handled ERATT */
                                ha_copy &= ~HA_ERATT;
                        else
                                /* Indicate interrupt handler handles ERATT */
                                phba->hba_flag |= HBA_ERATT_HANDLED;
                }

                /*
                 * If there is deferred error attention, do not check for any
                 * interrupt.
                 */
                if (unlikely(phba->hba_flag & DEFER_ERATT)) {
                        spin_unlock_irq(&phba->hbalock);
                        return IRQ_NONE;
                }

                /* Clear up only attention source related to slow-path */
                writel((ha_copy & (HA_MBATT | HA_R2_CLR_MSK)),
                        phba->HAregaddr);
                readl(phba->HAregaddr); /* flush */
                spin_unlock_irqrestore(&phba->hbalock, iflag);
        } else
                ha_copy = phba->ha_copy;

        work_ha_copy = ha_copy & phba->work_ha_mask;

        if (work_ha_copy) {
                if (work_ha_copy & HA_LATT) {
                        if (phba->sli.sli_flag & LPFC_PROCESS_LA) {
                                /*
                                 * Turn off Link Attention interrupts
                                 * until CLEAR_LA done
                                 */
                                spin_lock_irqsave(&phba->hbalock, iflag);
                                phba->sli.sli_flag &= ~LPFC_PROCESS_LA;
                                control = readl(phba->HCregaddr);
                                control &= ~HC_LAINT_ENA;
                                writel(control, phba->HCregaddr);
                                readl(phba->HCregaddr); /* flush */
                                spin_unlock_irqrestore(&phba->hbalock, iflag);
                        }
                        else
                                work_ha_copy &= ~HA_LATT;
                }

                if (work_ha_copy & ~(HA_ERATT | HA_MBATT | HA_LATT)) {
                        /*
                         * Turn off Slow Rings interrupts, LPFC_ELS_RING is
                         * the only slow ring.
                         */
                        status = (work_ha_copy &
                                (HA_RXMASK  << (4*LPFC_ELS_RING)));
                        status >>= (4*LPFC_ELS_RING);
                        if (status & HA_RXMASK) {
                                spin_lock_irqsave(&phba->hbalock, iflag);
                                control = readl(phba->HCregaddr);

                                lpfc_debugfs_slow_ring_trc(phba,
                                "ISR slow ring:   ctl:x%x stat:x%x isrcnt:x%x",
                                control, status,
                                (uint32_t)phba->sli.slistat.sli_intr);

                                if (control & (HC_R0INT_ENA << LPFC_ELS_RING)) {
                                        lpfc_debugfs_slow_ring_trc(phba,
                                                "ISR Disable ring:"
                                                "pwork:x%x hawork:x%x wait:x%x",
                                                phba->work_ha, work_ha_copy,
                                                (uint32_t)((unsigned long)
                                                &phba->work_waitq));

                                        control &=
                                            ~(HC_R0INT_ENA << LPFC_ELS_RING);
                                        writel(control, phba->HCregaddr);
                                        readl(phba->HCregaddr); /* flush */
                                }
                                else {
                                        lpfc_debugfs_slow_ring_trc(phba,
                                                "ISR slow ring:   pwork:"
                                                "x%x hawork:x%x wait:x%x",
                                                phba->work_ha, work_ha_copy,
                                                (uint32_t)((unsigned long)
                                                &phba->work_waitq));
                                }
                                spin_unlock_irqrestore(&phba->hbalock, iflag);
                        }
                }
                spin_lock_irqsave(&phba->hbalock, iflag);
                if (work_ha_copy & HA_ERATT) {
                        lpfc_sli_read_hs(phba);
                        /*
                         * Check if there is a deferred error condition
                         * is active
                         */
                        if ((HS_FFER1 & phba->work_hs) &&
                                ((HS_FFER2 | HS_FFER3 | HS_FFER4 | HS_FFER5 |
                                HS_FFER6 | HS_FFER7) & phba->work_hs)) {
                                phba->hba_flag |= DEFER_ERATT;
                                /* Clear all interrupt enable conditions */
                                writel(0, phba->HCregaddr);
                                readl(phba->HCregaddr);
                        }
                }

                if ((work_ha_copy & HA_MBATT) && (phba->sli.mbox_active)) {
                        pmb = phba->sli.mbox_active;
                        pmbox = &pmb->mb;
                        mbox = phba->mbox;
                        vport = pmb->vport;

                        /* First check out the status word */
                        lpfc_sli_pcimem_bcopy(mbox, pmbox, sizeof(uint32_t));
                        if (pmbox->mbxOwner != OWN_HOST) {
                                spin_unlock_irqrestore(&phba->hbalock, iflag);
                                /*
                                 * Stray Mailbox Interrupt, mbxCommand <cmd>
                                 * mbxStatus <status>
                                 */
                                lpfc_printf_log(phba, KERN_ERR, LOG_MBOX |
                                                LOG_SLI,
                                                "(%d):0304 Stray Mailbox "
                                                "Interrupt mbxCommand x%x "
                                                "mbxStatus x%x\n",
                                                (vport ? vport->vpi : 0),
                                                pmbox->mbxCommand,
                                                pmbox->mbxStatus);
                                /* clear mailbox attention bit */
                                work_ha_copy &= ~HA_MBATT;
                        } else {
                                phba->sli.mbox_active = NULL;
                                spin_unlock_irqrestore(&phba->hbalock, iflag);
                                phba->last_completion_time = jiffies;
                                del_timer(&phba->sli.mbox_tmo);
                                if (pmb->mbox_cmpl) {
                                        lpfc_sli_pcimem_bcopy(mbox, pmbox,
                                                        MAILBOX_CMD_SIZE);
                                }
                                if (pmb->mbox_flag & LPFC_MBX_IMED_UNREG) {
                                        pmb->mbox_flag &= ~LPFC_MBX_IMED_UNREG;

                                        lpfc_debugfs_disc_trc(vport,
                                                LPFC_DISC_TRC_MBOX_VPORT,
                                                "MBOX dflt rpi: : "
                                                "status:x%x rpi:x%x",
                                                (uint32_t)pmbox->mbxStatus,
                                                pmbox->un.varWords[0], 0);

                                        if (!pmbox->mbxStatus) {
                                                mp = (struct lpfc_dmabuf *)
                                                        (pmb->context1);
                                                ndlp = (struct lpfc_nodelist *)
                                                        pmb->context2;

                                                /* Reg_LOGIN of dflt RPI was
                                                 * successful. new lets get
                                                 * rid of the RPI using the
                                                 * same mbox buffer.
                                                 */
                                                lpfc_unreg_login(phba,
                                                        vport->vpi,
                                                        pmbox->un.varWords[0],
                                                        pmb);
                                                pmb->mbox_cmpl =
                                                        lpfc_mbx_cmpl_dflt_rpi;
                                                pmb->context1 = mp;
                                                pmb->context2 = ndlp;
                                                pmb->vport = vport;
                                                rc = lpfc_sli_issue_mbox(phba,
                                                                pmb,
                                                                MBX_NOWAIT);
                                                if (rc != MBX_BUSY)
                                                        lpfc_printf_log(phba,
                                                        KERN_ERR,
                                                        LOG_MBOX | LOG_SLI,
                                                        "0350 rc should have"
                                                        "been MBX_BUSY");
                                                goto send_current_mbox;
                                        }
                                }
                                spin_lock_irqsave(
                                                &phba->pport->work_port_lock,
                                                iflag);
                                phba->pport->work_port_events &=
                                        ~WORKER_MBOX_TMO;
                                spin_unlock_irqrestore(
                                                &phba->pport->work_port_lock,
                                                iflag);
                                lpfc_mbox_cmpl_put(phba, pmb);
                        }
                } else
                        spin_unlock_irqrestore(&phba->hbalock, iflag);

                if ((work_ha_copy & HA_MBATT) &&
                    (phba->sli.mbox_active == NULL)) {
send_current_mbox:
                        /* Process next mailbox command if there is one */
                        do {
                                rc = lpfc_sli_issue_mbox(phba, NULL,
                                                         MBX_NOWAIT);
                        } while (rc == MBX_NOT_FINISHED);
                        if (rc != MBX_SUCCESS)
                                lpfc_printf_log(phba, KERN_ERR, LOG_MBOX |
                                                LOG_SLI, "0349 rc should be "
                                                "MBX_SUCCESS");
                }

                spin_lock_irqsave(&phba->hbalock, iflag);
                phba->work_ha |= work_ha_copy;
                spin_unlock_irqrestore(&phba->hbalock, iflag);
                lpfc_worker_wake_up(phba);
        }
        return IRQ_HANDLED;

} /* lpfc_sp_intr_handler */

/**
 * lpfc_fp_intr_handler - The fast-path interrupt handler of lpfc driver
 * @irq: Interrupt number.
 * @dev_id: The device context pointer.
 *
 * This function is directly called from the PCI layer as an interrupt
 * service routine when the device is enabled with MSI-X multi-message
 * interrupt mode and there is a fast-path FCP IOCB ring event in the
 * HBA. However, when the device is enabled with either MSI or Pin-IRQ
 * interrupt mode, this function is called as part of the device-level
 * interrupt handler. When the PCI slot is in error recovery or the HBA
 * is undergoing initialization, the interrupt handler will not process
 * the interrupt. The SCSI FCP fast-path ring event are handled in the
 * intrrupt context. This function is called without any lock held. It
 * gets the hbalock to access and update SLI data structures.
 *
 * This function returns IRQ_HANDLED when interrupt is handled else it
 * returns IRQ_NONE.
 **/
irqreturn_t
lpfc_fp_intr_handler(int irq, void *dev_id)
{
        struct lpfc_hba  *phba;
        uint32_t ha_copy;
        unsigned long status;
        unsigned long iflag;

        /* Get the driver's phba structure from the dev_id and
         * assume the HBA is not interrupting.
         */
        phba = (struct lpfc_hba *) dev_id;

        if (unlikely(!phba))
                return IRQ_NONE;

        /*
         * Stuff needs to be attented to when this function is invoked as an
         * individual interrupt handler in MSI-X multi-message interrupt mode
         */
        if (phba->intr_type == MSIX) {
                /* If pci channel is offline, ignore all the interrupts */
                if (unlikely(pci_channel_offline(phba->pcidev)))
                        return IRQ_NONE;
                /* Update device-level interrupt statistics */
                phba->sli.slistat.sli_intr++;
                /* Ignore all interrupts during initialization. */
                if (unlikely(phba->link_state < LPFC_LINK_DOWN))
                        return IRQ_NONE;
                /* Need to read HA REG for FCP ring and other ring events */
                ha_copy = readl(phba->HAregaddr);
                /* Clear up only attention source related to fast-path */
                spin_lock_irqsave(&phba->hbalock, iflag);
                /*
                 * If there is deferred error attention, do not check for
                 * any interrupt.
                 */
                if (unlikely(phba->hba_flag & DEFER_ERATT)) {
                        spin_unlock_irq(&phba->hbalock);
                        return IRQ_NONE;
                }
                writel((ha_copy & (HA_R0_CLR_MSK | HA_R1_CLR_MSK)),
                        phba->HAregaddr);
                readl(phba->HAregaddr); /* flush */
                spin_unlock_irqrestore(&phba->hbalock, iflag);
        } else
                ha_copy = phba->ha_copy;

        /*
         * Process all events on FCP ring. Take the optimized path for FCP IO.
         */
        ha_copy &= ~(phba->work_ha_mask);

        status = (ha_copy & (HA_RXMASK << (4*LPFC_FCP_RING)));
        status >>= (4*LPFC_FCP_RING);
        if (status & HA_RXMASK)
                lpfc_sli_handle_fast_ring_event(phba,
                                                &phba->sli.ring[LPFC_FCP_RING],
                                                status);

        if (phba->cfg_multi_ring_support == 2) {
                /*
                 * Process all events on extra ring. Take the optimized path
                 * for extra ring IO.
                 */
                status = (ha_copy & (HA_RXMASK << (4*LPFC_EXTRA_RING)));
                status >>= (4*LPFC_EXTRA_RING);
                if (status & HA_RXMASK) {
                        lpfc_sli_handle_fast_ring_event(phba,
                                        &phba->sli.ring[LPFC_EXTRA_RING],
                                        status);
                }
        }
        return IRQ_HANDLED;
}  /* lpfc_fp_intr_handler */

/**
 * lpfc_intr_handler - The device-level interrupt handler of lpfc driver
 * @irq: Interrupt number.
 * @dev_id: The device context pointer.
 *
 * This function is the device-level interrupt handler called from the PCI
 * layer when either MSI or Pin-IRQ interrupt mode is enabled and there is
 * an event in the HBA which requires driver attention. This function
 * invokes the slow-path interrupt attention handling function and fast-path
 * interrupt attention handling function in turn to process the relevant
 * HBA attention events. This function is called without any lock held. It
 * gets the hbalock to access and update SLI data structures.
 *
 * This function returns IRQ_HANDLED when interrupt is handled, else it
 * returns IRQ_NONE.
 **/
irqreturn_t
lpfc_intr_handler(int irq, void *dev_id)
{
        struct lpfc_hba  *phba;
        irqreturn_t sp_irq_rc, fp_irq_rc;
        unsigned long status1, status2;

        /*
         * Get the driver's phba structure from the dev_id and
         * assume the HBA is not interrupting.
         */
        phba = (struct lpfc_hba *) dev_id;

        if (unlikely(!phba))
                return IRQ_NONE;

        /* If the pci channel is offline, ignore all the interrupts. */
        if (unlikely(pci_channel_offline(phba->pcidev)))
                return IRQ_NONE;

        /* Update device level interrupt statistics */
        phba->sli.slistat.sli_intr++;

        /* Ignore all interrupts during initialization. */
        if (unlikely(phba->link_state < LPFC_LINK_DOWN))
                return IRQ_NONE;

        spin_lock(&phba->hbalock);
        phba->ha_copy = readl(phba->HAregaddr);
        if (unlikely(!phba->ha_copy)) {
                spin_unlock(&phba->hbalock);
                return IRQ_NONE;
        } else if (phba->ha_copy & HA_ERATT) {
                if (phba->hba_flag & HBA_ERATT_HANDLED)
                        /* ERATT polling has handled ERATT */
                        phba->ha_copy &= ~HA_ERATT;
                else
                        /* Indicate interrupt handler handles ERATT */
                        phba->hba_flag |= HBA_ERATT_HANDLED;
        }

        /*
         * If there is deferred error attention, do not check for any interrupt.
         */
        if (unlikely(phba->hba_flag & DEFER_ERATT)) {
                spin_unlock_irq(&phba->hbalock);
                return IRQ_NONE;
        }

        /* Clear attention sources except link and error attentions */
        writel((phba->ha_copy & ~(HA_LATT | HA_ERATT)), phba->HAregaddr);
        readl(phba->HAregaddr); /* flush */
        spin_unlock(&phba->hbalock);

        /*
         * Invokes slow-path host attention interrupt handling as appropriate.
         */

        /* status of events with mailbox and link attention */
        status1 = phba->ha_copy & (HA_MBATT | HA_LATT | HA_ERATT);

        /* status of events with ELS ring */
        status2 = (phba->ha_copy & (HA_RXMASK  << (4*LPFC_ELS_RING)));
        status2 >>= (4*LPFC_ELS_RING);

        if (status1 || (status2 & HA_RXMASK))
                sp_irq_rc = lpfc_sp_intr_handler(irq, dev_id);
        else
                sp_irq_rc = IRQ_NONE;

        /*
         * Invoke fast-path host attention interrupt handling as appropriate.
         */

        /* status of events with FCP ring */
        status1 = (phba->ha_copy & (HA_RXMASK << (4*LPFC_FCP_RING)));
        status1 >>= (4*LPFC_FCP_RING);

        /* status of events with extra ring */
        if (phba->cfg_multi_ring_support == 2) {
                status2 = (phba->ha_copy & (HA_RXMASK << (4*LPFC_EXTRA_RING)));
                status2 >>= (4*LPFC_EXTRA_RING);
        } else
                status2 = 0;

        if ((status1 & HA_RXMASK) || (status2 & HA_RXMASK))
                fp_irq_rc = lpfc_fp_intr_handler(irq, dev_id);
        else
                fp_irq_rc = IRQ_NONE;

        /* Return device-level interrupt handling status */
        return (sp_irq_rc == IRQ_HANDLED) ? sp_irq_rc : fp_irq_rc;
}  /* lpfc_intr_handler */