/*
 * Copyright (c) 2004 The Unichrome Project. All rights reserved.
 * Copyright (c) 2000 Intel Corporation. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHOR(S) OR COPYRIGHT HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "xf86.h"
#include "xf86_OSproc.h"

#if GET_ABI_MAJOR(ABI_VIDEODRV_VERSION) < 6 
#include "xf86Resources.h"
#endif

#include "compiler.h"
#include "xf86PciInfo.h"
#include "xf86Pci.h"
#include "xf86fbman.h"
#include "regionstr.h"

#ifdef OPENCHROMEDRI

#include "via.h"
#include "via_drm.h"
#include "via_dri.h"
#include "via_driver.h"
#include "via_id.h"

#include "xf86xv.h"
#include "fourcc.h"

#if defined(X_NEED_XVPRIV_H) || defined (_XF86_FOURCC_H_)
#include "xf86xvpriv.h"
#endif

#include "xf86xvmc.h"
#include <X11/extensions/Xv.h>
#include <X11/extensions/XvMC.h>
#include "xaa.h"
#include "xaalocal.h"
#include "dixstruct.h"
#include "via_xvmc.h"
#include "dristruct.h"
#include "dri.h"
#include "via_xvpriv.h"
#include "via_video.h"

#define MAKE_ATOM(a) MakeAtom(a, strlen(a), TRUE)


/*
 * List of attributes for the XvMC extension to handle.
 * As long as the attribute is supported by the Xv adaptor, it needs only
 * to be added here to be supported also by XvMC. 
 * Currently, only colorkey seems to be supported by Xv for Putimage.
 */
static char *attrXvMC[VIA_NUM_XVMC_ATTRIBUTES] = { "XV_COLORKEY",
    "XV_AUTOPAINT_COLORKEY",
    "XV_BRIGHTNESS",
    "XV_CONTRAST",
    "XV_SATURATION",
    "XV_HUE"
};
static Atom attrAtoms[VIA_NUM_XVMC_ATTRIBUTES];

/*
 * Xv Port private structure for XvMC.
 */
typedef struct
{
    unsigned ctxDisplaying;
    int xvmc_port;
    ViaXvMCAttrHolder xvAttr;
    int newAttribute;

    SetPortAttributeFuncPtr SetPortAttribute;
    GetPortAttributeFuncPtr GetPortAttribute;
    PutImageFuncPtr PutImage;
} ViaXvMCXVPriv;

/* Proposed XvMC VIA driver extension. */
#define XVMC_VLD 0x0020000


/* Function declarations. */
static int ViaXvMCCreateContext(ScrnInfoPtr pScrn, XvMCContextPtr pContext,
                                int *num_priv, INT32 ** priv);
static void ViaXvMCDestroyContext(ScrnInfoPtr pScrn, XvMCContextPtr pContext);
static int ViaXvMCCreateSurface(ScrnInfoPtr pScrn, XvMCSurfacePtr pSurf,
                                int *num_priv, INT32 ** priv);
static void ViaXvMCDestroySurface(ScrnInfoPtr pScrn, XvMCSurfacePtr pSurf);
static int ViaXvMCCreateSubpicture(ScrnInfoPtr pScrn, XvMCSubpicturePtr pSurf,
                                   int *num_priv, INT32 ** priv);
static void ViaXvMCDestroySubpicture(ScrnInfoPtr pScrn,
                                     XvMCSubpicturePtr pSubp);
static int viaXvMCInterceptXvAttribute(ScrnInfoPtr pScrn, Atom attribute,
                                       INT32 value, pointer data);
static int viaXvMCInterceptPutImage(ScrnInfoPtr, short, short, short, short,
                                    short, short, short, short, int,
                                    unsigned char *, short, short, Bool,
                                    RegionPtr, pointer, DrawablePtr);
static int viaXvMCInterceptXvGetAttribute(ScrnInfoPtr pScrn, Atom attribute,
                                          INT32 * value, pointer data);


/*
 * Initialize and clean up the screen private parts of XvMC.
 */
static void
initViaXvMC(ViaXvMCPtr vXvMC)
{
    unsigned i;

    for (i = 0; i < VIA_XVMC_MAX_CONTEXTS; ++i) {
        vXvMC->contexts[i] = 0;
        vXvMC->cPrivs[i] = 0;
    }

    for (i = 0; i < VIA_XVMC_MAX_SURFACES; ++i) {
        vXvMC->surfaces[i] = 0;
        vXvMC->sPrivs[i] = 0;
    }
}

static void
cleanupViaXvMC(ViaXvMCPtr vXvMC, XF86VideoAdaptorPtr * XvAdaptors,
               int XvAdaptorCount)
{
    unsigned i;

    for (i = 0; i < VIA_XVMC_MAX_CONTEXTS; ++i) {
        vXvMC->contexts[i] = 0;
        if (vXvMC->cPrivs[i]) {
            free(vXvMC->cPrivs[i]);
            vXvMC->cPrivs[i] = 0;
        }
    }

    for (i = 0; i < VIA_XVMC_MAX_SURFACES; ++i) {
        vXvMC->surfaces[i] = 0;
        if (vXvMC->sPrivs[i]) {
            free(vXvMC->sPrivs[i]);
            vXvMC->sPrivs[i] = 0;
        }
    }
}

static unsigned
stride(int w)
{
    return (w + 31) & ~31;
}

static unsigned long
size_yuv420(int w, int h)
{
    unsigned yPitch = stride(w);

    return h * (yPitch + (yPitch >> 1));
}

static unsigned long
size_xx44(int w, int h)
{
    return h * stride(w);
}


static int yv12_subpicture_index_list[2] = {
    FOURCC_IA44,
    FOURCC_AI44
};

static XF86MCImageIDList yv12_subpicture_list = {
    2,
    yv12_subpicture_index_list
};

static XF86MCSurfaceInfoRec Via_YV12_mpg2_surface = {
    FOURCC_YV12,
    XVMC_CHROMA_FORMAT_420,
    0,
    1024,
    1024,
    1024,
    1024,
    XVMC_MPEG_2 | XVMC_VLD,
    XVMC_OVERLAID_SURFACE | XVMC_BACKEND_SUBPICTURE,
    &yv12_subpicture_list
};

static XF86MCSurfaceInfoRec Via_pga_mpg2_surface = {
    FOURCC_YV12,
    XVMC_CHROMA_FORMAT_420,
    0,
    2048,
    2048,
    2048,
    2048,
    XVMC_MPEG_2 | XVMC_VLD,
    XVMC_OVERLAID_SURFACE | XVMC_BACKEND_SUBPICTURE,
    &yv12_subpicture_list
};

static XF86MCSurfaceInfoRec Via_YV12_mpg1_surface = {
    FOURCC_YV12,
    XVMC_CHROMA_FORMAT_420,
    0,
    1024,
    1024,
    1024,
    1024,
    XVMC_MPEG_1 | XVMC_VLD,
    XVMC_OVERLAID_SURFACE | XVMC_BACKEND_SUBPICTURE,
    &yv12_subpicture_list
};

static XF86MCSurfaceInfoRec Via_pga_mpg1_surface = {
    FOURCC_YV12,
    XVMC_CHROMA_FORMAT_420,
    0,
    2048,
    2048,
    2048,
    2048,
    XVMC_MPEG_1 | XVMC_VLD,
    XVMC_OVERLAID_SURFACE | XVMC_BACKEND_SUBPICTURE,
    &yv12_subpicture_list
};

static XF86MCSurfaceInfoPtr ppSI[2] = {
    (XF86MCSurfaceInfoPtr) & Via_YV12_mpg2_surface,
    (XF86MCSurfaceInfoPtr) & Via_YV12_mpg1_surface
};

static XF86MCSurfaceInfoPtr ppSI_pga[2] = {
    (XF86MCSurfaceInfoPtr) & Via_pga_mpg2_surface,
    (XF86MCSurfaceInfoPtr) & Via_pga_mpg1_surface
};

/* List of supported subpicture types. */
static XF86ImageRec ia44_subpicture = XVIMAGE_IA44;
static XF86ImageRec ai44_subpicture = XVIMAGE_AI44;

static XF86ImagePtr Via_subpicture_list[2] = {
    (XF86ImagePtr) & ia44_subpicture,
    (XF86ImagePtr) & ai44_subpicture
};

/* 
 * Filling in the device dependent adaptor record. 
 * This is named "VIA Video Overlay" because this code falls under the
 * XV extension, the name must match or it won't be used.
 *
 * For surface and subpicture, see above.
 * The function pointers point to functions below.
 */
static XF86MCAdaptorRec pAdapt = {
    "XV_SWOV",            /* name */
    2,                    /* num_surfaces */
    ppSI,                 /* surfaces */
    2,                    /* num_subpictures */
    Via_subpicture_list,  /* subpictures */
    (xf86XvMCCreateContextProcPtr) ViaXvMCCreateContext,
    (xf86XvMCDestroyContextProcPtr) ViaXvMCDestroyContext,
    (xf86XvMCCreateSurfaceProcPtr) ViaXvMCCreateSurface,
    (xf86XvMCDestroySurfaceProcPtr) ViaXvMCDestroySurface,
    (xf86XvMCCreateSubpictureProcPtr) ViaXvMCCreateSubpicture,
    (xf86XvMCDestroySubpictureProcPtr) ViaXvMCDestroySubpicture
};

static XF86MCAdaptorRec pAdapt_pga = {
    "XV_SWOV",            /* name */
    2,                    /* num_surfaces */
    ppSI_pga,             /* surfaces */
    2,                    /* num_subpictures */
    Via_subpicture_list,  /* subpictures */
    (xf86XvMCCreateContextProcPtr) ViaXvMCCreateContext,
    (xf86XvMCDestroyContextProcPtr) ViaXvMCDestroyContext,
    (xf86XvMCCreateSurfaceProcPtr) ViaXvMCCreateSurface,
    (xf86XvMCDestroySurfaceProcPtr) ViaXvMCDestroySurface,
    (xf86XvMCCreateSubpictureProcPtr) ViaXvMCCreateSubpicture,
    (xf86XvMCDestroySubpictureProcPtr) ViaXvMCDestroySubpicture
};

static XF86MCAdaptorPtr ppAdapt[1] = { (XF86MCAdaptorPtr) & pAdapt };
static XF86MCAdaptorPtr ppAdapt_pga[1] = { (XF86MCAdaptorPtr) & pAdapt_pga };


static void
mpegDisable(VIAPtr pVia, CARD32 val)
{
    MPGOutD(0x0c, MPGInD(0x0c) & (val ^ 0xffffffff));
}

void
ViaInitXVMC(ScreenPtr pScreen)
{
    ScrnInfoPtr pScrn = xf86ScreenToScrn(pScreen);
    VIAPtr pVia = VIAPTR(pScrn);
    ViaXvMCPtr vXvMC = &(pVia->xvmc);
    volatile ViaXvMCSAreaPriv *saPriv;

    pVia->XvMCEnabled = 0;

    if ((pVia->Chipset == VIA_KM400) ||
        (pVia->Chipset == VIA_CX700) ||
        (pVia->Chipset == VIA_K8M890) ||
        (pVia->Chipset == VIA_P4M900) ||
        (pVia->Chipset == VIA_VX800) ||
        (pVia->Chipset == VIA_VX855) ||
        (pVia->Chipset == VIA_VX900)) {
        xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
                   "[XvMC] XvMC is not supported on this chipset.\n");
        return;
    }

    if (!pVia->directRenderingEnabled) {
        xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
                   "[XvMC] Cannot use XvMC without DRI!\n");
        return;
    }

    if (((pVia->drmVerMajor <= 2) && (pVia->drmVerMinor < 4))) {
        xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
                   "[XvMC] Kernel drm is not compatible with XvMC.\n");
        xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
                   "[XvMC] Kernel drm version is %d.%d.%d; "
                   "at least version 2.4.0 is needed.\n",
                   pVia->drmVerMajor, pVia->drmVerMinor, pVia->drmVerPL);
        xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
                   "[XvMC] Please update. Disabling XvMC.\n");
        return;
    }

    vXvMC->mmioBase = pVia->registerHandle;

    if (drmAddMap(pVia->drmFD,
                  (drm_handle_t) pVia->FrameBufferBase,
                  pVia->videoRambytes, DRM_FRAME_BUFFER, 0,
                  &(vXvMC->fbBase)) < 0) {
        xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
                   "[XvMC] drmAddMap(FB) failed. Disabling XvMC.\n");
        return;
    }

    initViaXvMC(vXvMC);

    if (!xf86XvMCScreenInit(pScreen, 1, ((pVia->Chipset == VIA_PM800)
                                         ? ppAdapt_pga : ppAdapt))) {
        xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
                   "[XvMC] XvMCScreenInit failed. Disabling XvMC.\n");
        drmRmMap(pVia->drmFD, vXvMC->fbBase);
        return;
    }
#if (XvMCVersion > 1) || (XvMCRevision > 0)
    {
        DRIInfoPtr pDRIInfo = pVia->pDRIInfo;

        if (pVia->ChipId != PCI_CHIP_VT3259 &&
            pVia->ChipId != PCI_CHIP_VT3364) {
            xf86DrvMsg(pScrn->scrnIndex, X_INFO,
                       "[XvMC] Registering chromeXvMC.\n");
            xf86XvMCRegisterDRInfo(pScreen, "chromeXvMC", pDRIInfo->busIdString,
                                   VIAXVMC_MAJOR, VIAXVMC_MINOR, VIAXVMC_PL);
        } else {
            xf86DrvMsg(pScrn->scrnIndex, X_INFO,
                       "[XvMC] Registering chromeXvMCPro.\n");
            xf86XvMCRegisterDRInfo(pScreen, "chromeXvMCPro",
                                   pDRIInfo->busIdString, VIAXVMC_MAJOR,
                                   VIAXVMC_MINOR, VIAXVMC_PL);
        }
    }
#endif

    vXvMC->activePorts = 0;
    saPriv = (ViaXvMCSAreaPriv *) DRIGetSAREAPrivate(pScreen);
    saPriv->XvMCCtxNoGrabbed = ~0;

    XVMCLOCKPTR(saPriv, UNICHROME_LOCK_DECODER1)->lock = 0;

    xf86DrvMsg(pScrn->scrnIndex, X_INFO,
               "[XvMC] Initialized XvMC extension.\n");
    pVia->XvMCEnabled = 1;
}

void
ViaCleanupXVMC(ScrnInfoPtr pScrn, XF86VideoAdaptorPtr * XvAdaptors,
               int XvAdaptorCount)
{
    VIAPtr pVia = VIAPTR(pScrn);
    ViaXvMCPtr vXvMC = &(pVia->xvmc);
    int i, j;

    if (pVia->XvMCEnabled) {
        mpegDisable(pVia, 0);
        drmRmMap(pVia->drmFD, vXvMC->mmioBase);
        cleanupViaXvMC(vXvMC, XvAdaptors, XvAdaptorCount);
    }
    for (i = 0; i < XvAdaptorCount; ++i) {
        if (!XvAdaptors[i])
            continue;

        for (j = 0; j < XvAdaptors[i]->nPorts; ++j) {
            viaPortPrivPtr pPriv = XvAdaptors[i]->pPortPrivates[j].ptr;

            if (pPriv->xvmc_priv)
                free(pPriv->xvmc_priv);
        }
    }
    pVia->XvMCEnabled = 0;
}

static int
ViaXvMCCreateContext(ScrnInfoPtr pScrn, XvMCContextPtr pContext,
                     int *num_priv, INT32 ** priv)
{
    VIAPtr pVia = VIAPTR(pScrn);
    ViaXvMCPtr vXvMC = &(pVia->xvmc);
    DRIInfoPtr pDRIInfo = pVia->pDRIInfo;
    VIADRIPtr pViaDRI = pDRIInfo->devPrivate;
    ViaXvMCCreateContextRec *contextRec;
    unsigned ctxNo;
    ViaXvMCContextPriv *cPriv;
    XvPortRecPrivatePtr portPriv = (XvPortRecPrivatePtr) pContext->port_priv;
    viaPortPrivPtr pPriv = (viaPortPrivPtr) portPriv->DevPriv.ptr;
    ViaXvMCXVPriv *vx = (ViaXvMCXVPriv *) pPriv->xvmc_priv;
    volatile ViaXvMCSAreaPriv *sAPriv;

    sAPriv = (ViaXvMCSAreaPriv *) DRIGetSAREAPrivate(pScrn->pScreen);

    if (-1 == vx->xvmc_port) {
        vx->xvmc_port = (vXvMC->activePorts++);
        sAPriv->XvMCSubPicOn[vx->xvmc_port] = 0;
        sAPriv->XvMCDisplaying[vx->xvmc_port] = 0;
    }

    if (vXvMC->nContexts >= VIA_XVMC_MAX_CONTEXTS) {
        xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
                   "[XvMC] ViaXvMCCreateContext: Out of contexts.\n");
        return BadAlloc;
    }

    *priv = calloc(1, sizeof(ViaXvMCCreateContextRec));
    contextRec = (ViaXvMCCreateContextRec *) * priv;

    if (!*priv) {
        *num_priv = 0;
        return BadAlloc;
    }

    *num_priv = sizeof(ViaXvMCCreateContextRec) >> 2;

    for (ctxNo = 0; ctxNo < VIA_XVMC_MAX_CONTEXTS; ++ctxNo) {
        if (0 == vXvMC->contexts[ctxNo])
            break;
    }

    cPriv = (ViaXvMCContextPriv *) calloc(1, sizeof(ViaXvMCContextPriv));

    if (!cPriv) {
        xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
                   "[XvMC] ViaXvMCCreateContext: Unable to allocate memory!\n");
        free(*priv);
        *num_priv = 0;
        return BadAlloc;
    }

    /* Export framebuffer and mmio to non-root clients. */
    contextRec->ctxNo = ctxNo;
    contextRec->xvmc_port = vx->xvmc_port;
    contextRec->fbOffset = vXvMC->fbBase;
    contextRec->fbSize = pVia->videoRambytes;
    contextRec->mmioOffset = vXvMC->mmioBase;
    contextRec->mmioSize = VIA_MMIO_REGSIZE;
    contextRec->sAreaSize = pDRIInfo->SAREASize;
    contextRec->sAreaPrivOffset = sizeof(OPENCHROMEDRISAREARec);
    contextRec->major = VIAXVMC_MAJOR;
    contextRec->minor = VIAXVMC_MINOR;
    contextRec->pl = VIAXVMC_PL;
    contextRec->initAttrs = vx->xvAttr;
    contextRec->useAGP = (pViaDRI->ringBufActive &&
                          ((pVia->Chipset == VIA_CLE266) ||
                           (pVia->Chipset == VIA_KM400) ||
                           (pVia->Chipset == VIA_PM800) ||
                           (pVia->Chipset == VIA_P4M900)));
    contextRec->chipId = pVia->ChipId;
    contextRec->screen = pScrn->pScreen->myNum;
    contextRec->depth = pScrn->bitsPerPixel;
    contextRec->stride = pVia->Bpp * pScrn->virtualX;

    vXvMC->nContexts++;
    vXvMC->contexts[ctxNo] = pContext->context_id;
    vXvMC->cPrivs[ctxNo] = cPriv;

    return Success;
}

static int
ViaXvMCCreateSurface(ScrnInfoPtr pScrn, XvMCSurfacePtr pSurf,
                     int *num_priv, INT32 ** priv)
{
    VIAPtr pVia = VIAPTR(pScrn);
    ViaXvMCPtr vXvMC = &(pVia->xvmc);
    unsigned srfNo, numBuffers, i;
    ViaXvMCSurfacePriv *sPriv;
    XvMCContextPtr ctx;
    unsigned bufSize, yBufSize;

    if (VIA_XVMC_MAX_SURFACES == vXvMC->nSurfaces) {
        xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
                   "[XvMC] ViaXvMCCreateSurface: Too many surfaces !\n");
        return BadAlloc;
    }

    sPriv = (ViaXvMCSurfacePriv *) calloc(1, sizeof(ViaXvMCSurfacePriv));

    if (!sPriv) {
        xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
                   "[XvMC] ViaXvMCCreateSurface: Unable to allocate memory!\n");
        *num_priv = 0;
        return BadAlloc;
    }

    numBuffers = 1;

    /*
     * Some chips require more than one buffer per surface (and a special
     * flipping procedure; See Ivor Hewitt's ddmpeg.c version 1.6). The client
     * lib will detect the number of buffers allocated and determine the
     * flipping method from that.
     */
#if 0  /* Not enabled yet. */
    switch (pVia->ChipSet) {
        case VIA_CLE266:
            switch (pVia->ChipRev) {
                case 0x10:  /* CLE266 C0 only? Or all C? */
                    numBuffers = 2;
                    break;
                default:
                    break;
            }
            break;
        default:
            break;
    }
#endif
    *num_priv = numBuffers + 2;

    *priv = (INT32 *) calloc(*num_priv, sizeof(INT32));

    if (!*priv) {
        xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
                   "[XvMC] ViaXvMCCreateSurface: Unable to allocate memory!\n");
        *num_priv = 0;
        free(sPriv);
        return BadAlloc;
    }

    for (srfNo = 0; srfNo < VIA_XVMC_MAX_SURFACES; ++srfNo) {
        if (0 == vXvMC->sPrivs[srfNo])
            break;
    }

    (*priv)[0] = srfNo;

    ctx = pSurf->context;
    bufSize = size_yuv420(ctx->width, ctx->height);
    sPriv->memory_ref.pool = 0;
    if (VIAAllocLinear(&(sPriv->memory_ref), pScrn,
                       numBuffers * bufSize + 32)) {
        free(*priv);
        free(sPriv);
        xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "[XvMC] ViaXvMCCreateSurface: "
                   "Unable to allocate frambuffer memory!\n");
        return BadAlloc;
    }

    (*priv)[1] = numBuffers;
    (*priv)[2] = sPriv->offsets[0] = ALIGN_TO(sPriv->memory_ref.base, 32);
    for (i = 1; i < numBuffers; ++i) {
        (*priv)[i + 2] = sPriv->offsets[i] = sPriv->offsets[i - 1] + bufSize;
    }

    yBufSize = stride(ctx->width) * ctx->height;
    for (i = 0; i < numBuffers; ++i) {
        memset((CARD8 *) (pVia->FBBase) + sPriv->offsets[i], 0, yBufSize);
        memset((CARD8 *) (pVia->FBBase) + sPriv->offsets[i] + yBufSize, 0x80,
               yBufSize >> 1);
    }

    vXvMC->sPrivs[srfNo] = sPriv;
    vXvMC->surfaces[srfNo] = pSurf->surface_id;
    vXvMC->nSurfaces++;
    return Success;
}

static int
ViaXvMCCreateSubpicture(ScrnInfoPtr pScrn, XvMCSubpicturePtr pSubp,
                        int *num_priv, INT32 ** priv)
{
    VIAPtr pVia = VIAPTR(pScrn);
    ViaXvMCPtr vXvMC = &(pVia->xvmc);
    unsigned srfNo;
    ViaXvMCSurfacePriv *sPriv;
    XvMCContextPtr ctx;
    unsigned bufSize;

    if (VIA_XVMC_MAX_SURFACES == vXvMC->nSurfaces) {
        xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
                   "[XvMC] ViaXvMCCreateSubpicture: Too many surfaces !\n");
        return BadAlloc;
    }

    sPriv = (ViaXvMCSurfacePriv *) calloc(1, sizeof(ViaXvMCSurfacePriv));

    if (!sPriv) {
        xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "[XvMC] ViaXvMCCreateSubpicture:"
                   " Unable to allocate memory!\n");
        *num_priv = 0;
        return BadAlloc;
    }

    *priv = (INT32 *) calloc(3, sizeof(INT32));

    if (!*priv) {
        xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "[XvMC] ViaXvMCCreateSubpicture:"
                   " Unable to allocate memory!\n");
        *num_priv = 0;
        free(sPriv);
        return BadAlloc;
    }

    *num_priv = 2;

    for (srfNo = 0; srfNo < VIA_XVMC_MAX_SURFACES; ++srfNo) {
        if (0 == vXvMC->sPrivs[srfNo])
            break;
    }

    (*priv)[0] = srfNo;

    ctx = pSubp->context;
    bufSize = size_xx44(ctx->width, ctx->height);
    sPriv->memory_ref.pool = 0;
    if (VIAAllocLinear(&(sPriv->memory_ref), pScrn, 1 * bufSize + 32)) {
        free(*priv);
        free(sPriv);
        xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "[XvMC] ViaXvMCCreateSubpicture:"
                   " Unable to allocate framebuffer memory!\n");
        return BadAlloc;
    }
    (*priv)[1] = sPriv->offsets[0] = ALIGN_TO(sPriv->memory_ref.base, 32);

    vXvMC->sPrivs[srfNo] = sPriv;
    vXvMC->surfaces[srfNo] = pSubp->subpicture_id;
    vXvMC->nSurfaces++;

    return Success;
}

static void
ViaXvMCDestroyContext(ScrnInfoPtr pScrn, XvMCContextPtr pContext)
{
    VIAPtr pVia = VIAPTR(pScrn);
    ViaXvMCPtr vXvMC = &(pVia->xvmc);
    int i;
    volatile ViaXvMCSAreaPriv *sAPriv;
    viaPortPrivPtr pPriv;
    XvPortRecPrivatePtr portPriv;
    ViaXvMCXVPriv *vx;

    for (i = 0; i < VIA_XVMC_MAX_CONTEXTS; i++) {
        if (vXvMC->contexts[i] == pContext->context_id) {

            sAPriv = (ViaXvMCSAreaPriv *) DRIGetSAREAPrivate(pScrn->pScreen);
            portPriv = (XvPortRecPrivatePtr) pContext->port_priv;
            pPriv = (viaPortPrivPtr) portPriv->DevPriv.ptr;
            vx = (ViaXvMCXVPriv *) pPriv->xvmc_priv;

            if ((i | VIA_XVMC_VALID) == vx->ctxDisplaying) {
                vx->ctxDisplaying = 0;
            }

            free(vXvMC->cPrivs[i]);
            vXvMC->cPrivs[i] = 0;
            vXvMC->nContexts--;
            vXvMC->contexts[i] = 0;
            return;
        }
    }
    return;
}

static void
ViaXvMCDestroySurface(ScrnInfoPtr pScrn, XvMCSurfacePtr pSurf)
{
    VIAPtr pVia = VIAPTR(pScrn);
    ViaXvMCPtr vXvMC = &(pVia->xvmc);
    int i;
    volatile ViaXvMCSAreaPriv *sAPriv;
    XvMCContextPtr pContext = pSurf->context;
    XvPortRecPrivatePtr portPriv = (XvPortRecPrivatePtr) pContext->port_priv;
    viaPortPrivPtr pPriv = (viaPortPrivPtr) portPriv->DevPriv.ptr;
    ViaXvMCXVPriv *vx = (ViaXvMCXVPriv *) pPriv->xvmc_priv;

    for (i = 0; i < VIA_XVMC_MAX_SURFACES; i++) {
        if (vXvMC->surfaces[i] == pSurf->surface_id) {

            sAPriv = (ViaXvMCSAreaPriv *) DRIGetSAREAPrivate(pScrn->pScreen);
            {
                DRM_CAS_RESULT(__ret);
                DRM_CAS(&(sAPriv->XvMCDisplaying[vx->xvmc_port]),
                        i | VIA_XVMC_VALID, 0, __ret);
                if (!__ret)
                    ViaOverlayHide(pScrn);
            }

            VIAFreeLinear(&(vXvMC->sPrivs[i]->memory_ref));
            free(vXvMC->sPrivs[i]);
            vXvMC->nSurfaces--;
            vXvMC->sPrivs[i] = 0;
            vXvMC->surfaces[i] = 0;
            return;
        }
    }
    return;
}

static void
ViaXvMCDestroySubpicture(ScrnInfoPtr pScrn, XvMCSubpicturePtr pSubp)
{
    VIAPtr pVia = VIAPTR(pScrn);
    ViaXvMCPtr vXvMC = &(pVia->xvmc);
    int i;
    volatile ViaXvMCSAreaPriv *sAPriv;
    XvMCContextPtr pContext = pSubp->context;
    XvPortRecPrivatePtr portPriv = (XvPortRecPrivatePtr) pContext->port_priv;
    viaPortPrivPtr pPriv = (viaPortPrivPtr) portPriv->DevPriv.ptr;
    ViaXvMCXVPriv *vx = (ViaXvMCXVPriv *) pPriv->xvmc_priv;

    for (i = 0; i < VIA_XVMC_MAX_SURFACES; i++) {
        if (vXvMC->surfaces[i] == pSubp->subpicture_id) {

            sAPriv = (ViaXvMCSAreaPriv *) DRIGetSAREAPrivate(pScrn->pScreen);

            {
                DRM_CAS_RESULT(__ret);

                DRM_CAS(&(sAPriv->XvMCSubPicOn[vx->xvmc_port]),
                        i | VIA_XVMC_VALID, 0, __ret);
                if (!__ret) {
                    /* Turn subpicture off. */
                    while (VIDInD(V_COMPOSE_MODE) &
                           (V1_COMMAND_FIRE | V3_COMMAND_FIRE)) ;
                    VIDOutD(SUBP_CONTROL_STRIDE,
                            VIDInD(SUBP_CONTROL_STRIDE) & ~SUBP_HQV_ENABLE);
                }
            }

            VIAFreeLinear(&(vXvMC->sPrivs[i]->memory_ref));
            free(vXvMC->sPrivs[i]);
            vXvMC->nSurfaces--;
            vXvMC->sPrivs[i] = 0;
            vXvMC->surfaces[i] = 0;

            return;
        }
    }
    return;
}

/*
 * Tell XvMC clients that Xv is currently displaying;
 * return 1 if another client was displaying before.
 */
static int
viaXvMCSetDisplayLock(ScrnInfoPtr pScrn, ViaXvMCXVPriv * vx)
{
    VIAPtr pVia = VIAPTR(pScrn);
    ViaXvMCSAreaPriv *sAPriv = (ViaXvMCSAreaPriv *)
            DRIGetSAREAPrivate(pScrn->pScreen);

    if (vx->xvmc_port > 0) {
        if ((VIA_XVMC_MAX_SURFACES | VIA_XVMC_VALID) !=
            sAPriv->XvMCDisplaying[vx->xvmc_port]) {
            sAPriv->XvMCDisplaying[vx->xvmc_port] =
                    (VIA_XVMC_MAX_SURFACES | VIA_XVMC_VALID);
        }

        if (sAPriv->XvMCSubPicOn[vx->xvmc_port] & VIA_XVMC_VALID) {
            sAPriv->XvMCSubPicOn[vx->xvmc_port] = 0;
            while (VIDInD(V_COMPOSE_MODE) &
                   (V1_COMMAND_FIRE | V3_COMMAND_FIRE)) ;
            VIDOutD(SUBP_CONTROL_STRIDE,
                    VIDInD(SUBP_CONTROL_STRIDE) & ~SUBP_HQV_ENABLE);
        }
    }
    return 0;
}

int
viaXvMCInitXv(ScrnInfoPtr pScrn, XF86VideoAdaptorPtr XvAdapt)
{
    viaPortPrivPtr pPriv;
    ViaXvMCXVPriv *vx;
    unsigned i, j;

    for (j = 0; j < XvAdapt->nPorts; ++j) {
        pPriv = (viaPortPrivPtr) XvAdapt->pPortPrivates[j].ptr;

        if (NULL == (pPriv->xvmc_priv = calloc(1, sizeof(ViaXvMCXVPriv))))
            return BadAlloc;

        for (i = 0; i < VIA_NUM_XVMC_ATTRIBUTES; ++i) {
            attrAtoms[i] = MAKE_ATOM(attrXvMC[i]);
        }

        vx = (ViaXvMCXVPriv *) pPriv->xvmc_priv;

        vx->ctxDisplaying = 0;
        vx->xvAttr.numAttr = VIA_NUM_XVMC_ATTRIBUTES;
        vx->xvmc_port = -1;
        vx->newAttribute = 1;

        /* Set up wrappers. */
        vx->GetPortAttribute = XvAdapt->GetPortAttribute;
        vx->SetPortAttribute = XvAdapt->SetPortAttribute;
        vx->PutImage = XvAdapt->PutImage;

        XvAdapt->GetPortAttribute = viaXvMCInterceptXvGetAttribute;
        XvAdapt->SetPortAttribute = viaXvMCInterceptXvAttribute;
        XvAdapt->PutImage = viaXvMCInterceptPutImage;

        for (i = 0; i < VIA_NUM_XVMC_ATTRIBUTES; ++i) {
            vx->xvAttr.attributes[i].attribute = attrAtoms[i];
            vx->xvAttr.attributes[i].value = 0;
            vx->GetPortAttribute(pScrn, attrAtoms[i],
                                 &(vx->xvAttr.attributes[i].value), pPriv);
        }
    }
    return Success;
}

static int
viaXvMCInterceptXvAttribute(ScrnInfoPtr pScrn, Atom attribute,
                            INT32 value, pointer data)
{
    unsigned i;
    viaPortPrivPtr pPriv = (viaPortPrivPtr) data;
    ViaXvMCXVPriv *vx = (ViaXvMCXVPriv *) pPriv->xvmc_priv;

    if (VIAPTR(pScrn)->XvMCEnabled) {
        for (i = 0; i < vx->xvAttr.numAttr; ++i) {
            if (vx->xvAttr.attributes[i].attribute == attribute) {
                vx->xvAttr.attributes[i].value = value;
                if (vx->ctxDisplaying !=
                    (VIA_XVMC_MAX_CONTEXTS | VIA_XVMC_VALID)) {
                    vx->newAttribute = 1;
                    return 0;
                }
            }
        }
    }

    return vx->SetPortAttribute(pScrn, attribute, value, data);
}

static int
viaXvMCInterceptXvGetAttribute(ScrnInfoPtr pScrn, Atom attribute,
                               INT32 * value, pointer data)
{
    unsigned i;
    viaPortPrivPtr pPriv = (viaPortPrivPtr) data;
    ViaXvMCXVPriv *vx = (ViaXvMCXVPriv *) pPriv->xvmc_priv;

    if (VIAPTR(pScrn)->XvMCEnabled) {
        for (i = 0; i < vx->xvAttr.numAttr; ++i) {
            if (vx->xvAttr.attributes[i].attribute == attribute) {
                *value = vx->xvAttr.attributes[i].value;
                return Success;
            }
        }
    }

    return vx->GetPortAttribute(pScrn, attribute, value, data);
}

static int
viaXvMCDisplayAttributes(ScrnInfoPtr pScrn,
                         const ViaXvMCAttrHolder * ah, viaPortPrivPtr pPriv)
{
    ViaXvMCXVPriv *vx = (ViaXvMCXVPriv *) pPriv->xvmc_priv;
    unsigned i;
    int ret;

    for (i = 0; i < ah->numAttr; ++i) {
        ret = vx->SetPortAttribute(pScrn, ah->attributes[i].attribute,
                                   ah->attributes[i].value, pPriv);
        if (ret)
            return ret;
    }
    return Success;
}

static int
viaXvMCInterceptPutImage(ScrnInfoPtr pScrn, short src_x, short src_y,
                         short drw_x, short drw_y, short src_w,
                         short src_h, short drw_w, short drw_h,
                         int id, unsigned char *buf, short width,
                         short height, Bool sync, RegionPtr clipBoxes,
                         pointer data, DrawablePtr pDraw)
{
    viaPortPrivPtr pPriv = (viaPortPrivPtr) data;
    ViaXvMCXVPriv *vx = (ViaXvMCXVPriv *) pPriv->xvmc_priv;

    if (VIAPTR(pScrn)->XvMCEnabled) {
        if (FOURCC_XVMC == id) {
            volatile ViaXvMCSAreaPriv *sAPriv;
            ViaXvMCCommandBuffer *vXvMCData = (ViaXvMCCommandBuffer *) buf;

            sAPriv = (ViaXvMCSAreaPriv *) DRIGetSAREAPrivate(pScrn->pScreen);

            switch (vXvMCData->command) {
            case VIA_XVMC_COMMAND_ATTRIBUTES:
                if ((vXvMCData->ctxNo | VIA_XVMC_VALID) != vx->ctxDisplaying)
                    return 1;
                viaXvMCDisplayAttributes(pScrn, &vXvMCData->attrib, pPriv);
                return 0;
            case VIA_XVMC_COMMAND_FDISPLAY:
                if (sAPriv->XvMCDisplaying[vx->xvmc_port] != vXvMCData->srfNo)
                    return 1;
                viaXvMCDisplayAttributes(pScrn, &vXvMCData->attrib, pPriv);
                vx->ctxDisplaying = vXvMCData->ctxNo;
                break;
            case VIA_XVMC_COMMAND_DISPLAY:
                if ((vXvMCData->ctxNo | VIA_XVMC_VALID) != vx->ctxDisplaying) {
                    viaXvMCDisplayAttributes(pScrn, &vXvMCData->attrib, pPriv);
                }
                if (sAPriv->XvMCDisplaying[vx->xvmc_port] != vXvMCData->srfNo)
                    return 1;
                vx->ctxDisplaying = vXvMCData->ctxNo;
                break;
            case VIA_XVMC_COMMAND_UNDISPLAY:
                {
                    DRM_CAS_RESULT(__ret);
                    DRM_CAS(&(sAPriv->XvMCDisplaying[vx->xvmc_port]),
                        vXvMCData->srfNo, 0, __ret);
                    if (!__ret)
                        ViaOverlayHide(pScrn);
                }
                return Success;
            default:
                break;
            }
        } else {
            if ((VIA_XVMC_MAX_CONTEXTS | VIA_XVMC_VALID) != vx->ctxDisplaying) {
                viaXvMCDisplayAttributes(pScrn, &vx->xvAttr, pPriv);
                vx->ctxDisplaying = VIA_XVMC_MAX_CONTEXTS | VIA_XVMC_VALID;
            } else if (vx->newAttribute) {
                vx->newAttribute = 0;
                viaXvMCDisplayAttributes(pScrn, &vx->xvAttr, pPriv);
            }
            viaXvMCSetDisplayLock(pScrn, vx);
        }
    }
    return vx->PutImage(pScrn, src_x, src_y, drw_x, drw_y, src_w, src_h,
                        drw_w, drw_h, id, buf, width, height, sync, clipBoxes,
                        data, pDraw);
}

unsigned long
viaXvMCPutImageSize(ScrnInfoPtr pScrn)
{
    if (VIAPTR(pScrn)->XvMCEnabled)
        return sizeof(ViaXvMCCommandBuffer);
    return 0;
}

#endif /* OPENCHROMEDRI */