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/*
 * Copyright (c) 2007, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place - Suite 330, Boston, MA 02111-1307 USA.
 *
 * Jiang Yunhong <yunhong.jiang@intel.com>
 *
 * This file implements direct PCI assignment to a HVM guest
 */

#include "pt-msi.h"
#include <sys/mman.h>

/* MSI virtuailization functions */

/*
 * setup physical msi, but didn't enable it
 */
int pt_msi_setup(struct pt_dev *dev)
{
    int pirq = -1;

    if ( !(dev->msi->flags & MSI_FLAG_UNINIT) )
    {
        PT_LOG("setup physical after initialized?? \n");
        return -1;
    }

    if ( xc_physdev_map_pirq_msi(xc_handle, domid, MAP_PIRQ_TYPE_MSI,
                            AUTO_ASSIGN, &pirq,
							dev->pci_dev->dev << 3 | dev->pci_dev->func,
							dev->pci_dev->bus, 0, 1) )
    {
        PT_LOG("error map msi\n");
        return -1;
    }

    if ( pirq < 0 )
    {
        PT_LOG("invalid pirq number\n");
        return -1;
    }

    dev->msi->pirq = pirq;
    PT_LOG("msi mapped with pirq %x\n", pirq);

    return 0;
}

uint32_t __get_msi_gflags(uint32_t data, uint64_t addr)
{
    uint32_t result = 0;
    int rh, dm, dest_id, deliv_mode, trig_mode;

    rh = (addr >> MSI_ADDR_REDIRECTION_SHIFT) & 0x1;
    dm = (addr >> MSI_ADDR_DESTMODE_SHIFT) & 0x1;
    dest_id = (addr >> MSI_TARGET_CPU_SHIFT) & 0xff;
    deliv_mode = (data >> MSI_DATA_DELIVERY_SHIFT) & 0x7;
    trig_mode = (data >> MSI_DATA_TRIGGER_SHIFT) & 0x1;

    result |= dest_id | (rh << GFLAGS_SHIFT_RH) | (dm << GFLAGS_SHIFT_DM) | \
                (deliv_mode << GLFAGS_SHIFT_DELIV_MODE) |
                (trig_mode << GLFAGS_SHIFT_TRG_MODE);

    return result;
}

/*
 * Update msi mapping, usually called when MSI enabled,
 * except the first time
 */
int pt_msi_update(struct pt_dev *d)
{
    uint8_t gvec = 0;
    uint32_t gflags = 0;
    uint64_t addr = 0;
    
    /* get vector, address, flags info, etc. */
    gvec = d->msi->data & 0xFF;
    addr = (uint64_t)d->msi->addr_hi << 32 | d->msi->addr_lo;
    gflags = __get_msi_gflags(d->msi->data, addr);
    
    PT_LOG("now update msi with pirq %x gvec %x\n", d->msi->pirq, gvec);
    return xc_domain_update_msi_irq(xc_handle, domid, gvec,
                                     d->msi->pirq, gflags);
}

/* MSI-X virtulization functions */
static void mask_physical_msix_entry(struct pt_dev *dev, int entry_nr, int mask)
{
    void *phys_off;

    phys_off = dev->msix->phys_iomem_base + 16 * entry_nr + 12;
    *(uint32_t *)phys_off = mask;
}

static int pt_msix_update_one(struct pt_dev *dev, int entry_nr)
{
    struct msix_entry_info *entry = &dev->msix->msix_entry[entry_nr];
    int pirq = entry->pirq;
    int gvec = entry->io_mem[2] & 0xff;
    uint64_t gaddr = *(uint64_t *)&entry->io_mem[0];
    uint32_t gflags = __get_msi_gflags(entry->io_mem[2], gaddr);
    int ret;

    if ( !entry->flags )
        return 0;

    /* Check if this entry is already mapped */
    if ( entry->pirq == -1 )
    {
        ret = xc_physdev_map_pirq_msi(xc_handle, domid, MAP_PIRQ_TYPE_MSI,
                                AUTO_ASSIGN, &pirq,
                                dev->pci_dev->dev << 3 | dev->pci_dev->func,
                                dev->pci_dev->bus, entry_nr, 0);
        if ( ret )
        {
            PT_LOG("error map msix entry %x\n", entry_nr);
            return ret;
        }
        entry->pirq = pirq;
    }

    PT_LOG("now update msix entry %x with pirq %x gvec %x\n",
            entry_nr, pirq, gvec);

    ret = xc_domain_update_msi_irq(xc_handle, domid, gvec, pirq, gflags);
    if ( ret )
    {
        PT_LOG("error update msix irq info for entry %d\n", entry_nr);
        return ret;
    }

    entry->flags = 0;

    return 0;
}

int pt_msix_update(struct pt_dev *dev)
{
    struct pt_msix_info *msix = dev->msix;
    int i;

    for ( i = 0; i < msix->total_entries; i++ )