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xserver/exa/exa.c

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/*
* Copyright © 2001 Keith Packard
*
* Partly based on code that is Copyright © The XFree86 Project Inc.
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of Keith Packard not be used in
* advertising or publicity pertaining to distribution of the software without
* specific, written prior permission. Keith Packard makes no
* representations about the suitability of this software for any purpose. It
* is provided "as is" without express or implied warranty.
*
* KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/** @file
* This file covers the initialization and teardown of EXA, and has various
* functions not responsible for performing rendering, pixmap migration, or
* memory management.
*/
#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif
#include <stdlib.h>
#include "exa_priv.h"
#include <X11/fonts/fontstruct.h>
#include "dixfontstr.h"
#include "exa.h"
#include "cw.h"
static int exaGeneration;
int exaScreenPrivateIndex;
int exaPixmapPrivateIndex;
/**
* exaGetPixmapOffset() returns the offset (in bytes) within the framebuffer of
* the beginning of the given pixmap.
*
* Note that drivers are free to, and often do, munge this offset as necessary
* for handing to the hardware -- for example, translating it into a different
* aperture. This function may need to be extended in the future if we grow
* support for having multiple card-accessible offscreen, such as an AGP memory
* pool alongside the framebuffer pool.
*/
unsigned long
exaGetPixmapOffset(PixmapPtr pPix)
{
ExaScreenPriv (pPix->drawable.pScreen);
return ((unsigned long)pPix->devPrivate.ptr -
(unsigned long)pExaScr->info->memoryBase);
}
/**
* exaGetPixmapPitch() returns the pitch (in bytes) of the given pixmap.
*
* This is a helper to make driver code more obvious, due to the rather obscure
* naming of the pitch field in the pixmap.
*/
unsigned long
exaGetPixmapPitch(PixmapPtr pPix)
{
return pPix->devKind;
}
/**
* exaGetPixmapSize() returns the size in bytes of the given pixmap in video
* memory. Only valid when the pixmap is currently in framebuffer.
*/
unsigned long
exaGetPixmapSize(PixmapPtr pPix)
{
ExaPixmapPrivPtr pExaPixmap;
pExaPixmap = ExaGetPixmapPriv(pPix);
if (pExaPixmap != NULL)
return pExaPixmap->fb_size;
return 0;
}
/**
* exaGetDrawablePixmap() returns a backing pixmap for a given drawable.
*
* @param pDrawable the drawable being requested.
*
* This function returns the backing pixmap for a drawable, whether it is a
* redirected window, unredirected window, or already a pixmap. Note that
* coordinate translation is needed when drawing to the backing pixmap of a
* redirected window, and the translation coordinates are provided by calling
* exaGetOffscreenPixmap() on the drawable.
*/
PixmapPtr
exaGetDrawablePixmap(DrawablePtr pDrawable)
{
if (pDrawable->type == DRAWABLE_WINDOW)
return pDrawable->pScreen->GetWindowPixmap ((WindowPtr) pDrawable);
else
return (PixmapPtr) pDrawable;
}
/**
* exaDrawableDirty() marks a pixmap backing a drawable as dirty, allowing for
* optimizations in pixmap migration when no changes have occurred.
*/
void
exaDrawableDirty (DrawablePtr pDrawable)
{
ExaPixmapPrivPtr pExaPixmap;
pExaPixmap = ExaGetPixmapPriv(exaGetDrawablePixmap (pDrawable));
if (pExaPixmap != NULL)
pExaPixmap->dirty = TRUE;
}
static Bool
exaDestroyPixmap (PixmapPtr pPixmap)
{
if (pPixmap->refcnt == 1)
{
ExaPixmapPriv (pPixmap);
if (pExaPixmap->area)
{
DBG_PIXMAP(("-- 0x%p (0x%x) (%dx%d)\n",
(void*)pPixmap->drawable.id,
ExaGetPixmapPriv(pPixmap)->area->offset,
pPixmap->drawable.width,
pPixmap->drawable.height));
/* Free the offscreen area */
exaOffscreenFree (pPixmap->drawable.pScreen, pExaPixmap->area);
pPixmap->devPrivate.ptr = pExaPixmap->sys_ptr;
pPixmap->devKind = pExaPixmap->sys_pitch;
}
}
return fbDestroyPixmap (pPixmap);
}
static int
exaLog2(int val)
{
int bits;
if (!val)
return 0;
for (bits = 0; val != 0; bits++)
val >>= 1;
return bits - 1;
}
/**
* exaCreatePixmap() creates a new pixmap.
*
* If width and height are 0, this won't be a full-fledged pixmap and it will
* get ModifyPixmapHeader() called on it later. So, we mark it as pinned, because
* ModifyPixmapHeader() would break migration. These types of pixmaps are used
* for scratch pixmaps, or to represent the visible screen.
*/
static PixmapPtr
exaCreatePixmap(ScreenPtr pScreen, int w, int h, int depth)
{
PixmapPtr pPixmap;
ExaPixmapPrivPtr pExaPixmap;
int bpp;
ExaScreenPriv(pScreen);
if (w > 32767 || h > 32767)
return NullPixmap;
pPixmap = fbCreatePixmap (pScreen, w, h, depth);
if (!pPixmap)
return NULL;
pExaPixmap = ExaGetPixmapPriv(pPixmap);
bpp = pPixmap->drawable.bitsPerPixel;
/* Glyphs have w/h equal to zero, and may not be migrated. See exaGlyphs. */
if (!w || !h)
pExaPixmap->score = EXA_PIXMAP_SCORE_PINNED;
else
pExaPixmap->score = EXA_PIXMAP_SCORE_INIT;
pExaPixmap->area = NULL;
pExaPixmap->sys_ptr = pPixmap->devPrivate.ptr;
pExaPixmap->sys_pitch = pPixmap->devKind;
pExaPixmap->fb_ptr = NULL;
if (pExaScr->info->flags & EXA_OFFSCREEN_ALIGN_POT && w != 1)
pExaPixmap->fb_pitch = (1 << (exaLog2(w - 1) + 1)) * bpp / 8;
else
pExaPixmap->fb_pitch = w * bpp / 8;
pExaPixmap->fb_pitch = EXA_ALIGN(pExaPixmap->fb_pitch,
pExaScr->info->pixmapPitchAlign);
pExaPixmap->fb_size = pExaPixmap->fb_pitch * h;
if (pExaPixmap->fb_pitch > 32767) {
fbDestroyPixmap(pPixmap);
return NULL;
}
pExaPixmap->dirty = FALSE;
return pPixmap;
}
/**
* exaPixmapIsOffscreen() is used to determine if a pixmap is in offscreen
* memory, meaning that acceleration could probably be done to it, and that it
* will need to be wrapped by PrepareAccess()/FinishAccess() when accessing it
* with the CPU.
*
* Note that except for UploadToScreen()/DownloadFromScreen() (which explicitly
* deal with moving pixmaps in and out of system memory), EXA will give drivers
* pixmaps as arguments for which exaPixmapIsOffscreen() is TRUE.
*
* @return TRUE if the given drawable is in framebuffer memory.
*/
Bool
exaPixmapIsOffscreen(PixmapPtr p)
{
ScreenPtr pScreen = p->drawable.pScreen;
ExaScreenPriv(pScreen);
return ((unsigned long) ((CARD8 *) p->devPrivate.ptr -
(CARD8 *) pExaScr->info->memoryBase) <
pExaScr->info->memorySize);
}
/**
* exaDrawableIsOffscreen() is a convenience wrapper for exaPixmapIsOffscreen().
*/
Bool
exaDrawableIsOffscreen (DrawablePtr pDrawable)
{
return exaPixmapIsOffscreen (exaGetDrawablePixmap (pDrawable));
}
/**
* Returns the pixmap which backs a drawable, and the offsets to add to
* coordinates to make them address the same bits in the backing drawable.
* These coordinates are nonzero only for redirected windows.
*/
PixmapPtr
exaGetOffscreenPixmap (DrawablePtr pDrawable, int *xp, int *yp)
{
PixmapPtr pPixmap;
int x, y;
if (pDrawable->type == DRAWABLE_WINDOW) {
pPixmap = (*pDrawable->pScreen->GetWindowPixmap) ((WindowPtr) pDrawable);
#ifdef COMPOSITE
x = -pPixmap->screen_x;
y = -pPixmap->screen_y;
#else
x = 0;
y = 0;
#endif
}
else
{
pPixmap = (PixmapPtr) pDrawable;
x = 0;
y = 0;
}
*xp = x;
*yp = y;
if (exaPixmapIsOffscreen (pPixmap))
return pPixmap;
else
return NULL;
}
/**
* exaPrepareAccess() is EXA's wrapper for the driver's PrepareAccess() handler.
*
* It deals with waiting for synchronization with the card, determining if
* PrepareAccess() is necessary, and working around PrepareAccess() failure.
*/
void
exaPrepareAccess(DrawablePtr pDrawable, int index)
{
ScreenPtr pScreen = pDrawable->pScreen;
ExaScreenPriv (pScreen);
PixmapPtr pPixmap;
pPixmap = exaGetDrawablePixmap (pDrawable);
if (exaPixmapIsOffscreen (pPixmap))
exaWaitSync (pDrawable->pScreen);
else
return;
if (pExaScr->info->PrepareAccess == NULL)
return;
if (!(*pExaScr->info->PrepareAccess) (pPixmap, index)) {
ExaPixmapPriv (pPixmap);
if (pExaPixmap->score != EXA_PIXMAP_SCORE_PINNED)
FatalError("Driver failed PrepareAccess on a pinned pixmap\n");
exaMoveOutPixmap (pPixmap);
}
}
/**
* exaFinishAccess() is EXA's wrapper for the driver's FinishAccess() handler.
*
* It deals with marking drawables as dirty, and calling the driver's
* FinishAccess() only if necessary.
*/
void
exaFinishAccess(DrawablePtr pDrawable, int index)
{
ScreenPtr pScreen = pDrawable->pScreen;
ExaScreenPriv (pScreen);
PixmapPtr pPixmap;
if (index == EXA_PREPARE_DEST)
exaDrawableDirty (pDrawable);
if (pExaScr->info->FinishAccess == NULL)
return;
pPixmap = exaGetDrawablePixmap (pDrawable);
if (!exaPixmapIsOffscreen (pPixmap))
return;
(*pExaScr->info->FinishAccess) (pPixmap, index);
}
/**
* exaValidateGC() chooses between the accelerated and unaccelerated GC Ops
* vectors.
*
* The unaccelerated (exaAsyncPixmapGCOps) vector is chosen if the drawable is
* offscreen. This means that operations that affect only that drawable will
* not result in migration of the pixmap. However, exaAsyncPixmapGCOps does use
* the accelerated operations for the Copy* functions, because the other
* drawable involved might be in framebuffer and require synchronization before
* accessing it. This means that for the Copy* functions, even using
* exaAsyncPixmapGCOps may result in migration, and therefore acceleration.
*
* Because of how nonintuitive exaAsyncPixmapGCOps is, and the fact that its
* only use is for dubious performance reasons (and probably just historical
* reasons), it is likely to go away in the future.
*/
static void
exaValidateGC (GCPtr pGC, Mask changes, DrawablePtr pDrawable)
{
fbValidateGC (pGC, changes, pDrawable);
if (exaDrawableIsOffscreen (pDrawable))
pGC->ops = (GCOps *) &exaOps;
else
pGC->ops = (GCOps *) &exaAsyncPixmapGCOps;
}
static GCFuncs exaGCFuncs = {
exaValidateGC,
miChangeGC,
miCopyGC,
miDestroyGC,
miChangeClip,
miDestroyClip,
miCopyClip
};
/**
* exaCreateGC makes a new GC and hooks up its funcs handler, so that
* exaValidateGC() will get called.
*/
static int
exaCreateGC (GCPtr pGC)
{
if (!fbCreateGC (pGC))
return FALSE;
pGC->funcs = &exaGCFuncs;
return TRUE;
}
/**
* exaCloseScreen() unwraps its wrapped screen functions and tears down EXA's
* screen private, before calling down to the next CloseSccreen.
*/
static Bool
exaCloseScreen(int i, ScreenPtr pScreen)
{
ExaScreenPriv(pScreen);
#ifdef RENDER
PictureScreenPtr ps = GetPictureScreenIfSet(pScreen);
#endif
pScreen->CreateGC = pExaScr->SavedCreateGC;
pScreen->CloseScreen = pExaScr->SavedCloseScreen;
pScreen->GetImage = pExaScr->SavedGetImage;
pScreen->GetSpans = pExaScr->SavedGetSpans;
pScreen->PaintWindowBackground = pExaScr->SavedPaintWindowBackground;
pScreen->PaintWindowBorder = pExaScr->SavedPaintWindowBorder;
pScreen->CreatePixmap = pExaScr->SavedCreatePixmap;
pScreen->DestroyPixmap = pExaScr->SavedDestroyPixmap;
pScreen->CopyWindow = pExaScr->SavedCopyWindow;
#ifdef RENDER
if (ps) {
ps->Composite = pExaScr->SavedComposite;
ps->Glyphs = pExaScr->SavedGlyphs;
}
#endif
xfree (pExaScr);
return (*pScreen->CloseScreen) (i, pScreen);
}
/**
* This function allocates a driver structure for EXA drivers to fill in. By
* having EXA allocate the structure, the driver structure can be extended
* without breaking ABI between EXA and the drivers. The driver's
* responsibility is to check beforehand that the EXA module has a matching
* major number and sufficient minor. Drivers are responsible for freeing the
* driver structure using xfree().
*
* @return a newly allocated, zero-filled driver structure
*/
ExaDriverPtr
exaDriverAlloc(void)
{
return xcalloc(1, sizeof(ExaDriverRec));
}
/**
* @param pScreen screen being initialized
* @param pScreenInfo EXA driver record
*
* exaDriverInit sets up EXA given a driver record filled in by the driver.
* pScreenInfo should have been allocated by exaDriverAlloc(). See the
* comments in _ExaDriver for what must be filled in and what is optional.
*
* @return TRUE if EXA was successfully initialized.
*/
Bool
exaDriverInit (ScreenPtr pScreen,
ExaDriverPtr pScreenInfo)
{
ExaScreenPrivPtr pExaScr;
if (pScreenInfo->exa_major != EXA_VERSION_MAJOR ||
pScreenInfo->exa_minor > EXA_VERSION_MINOR)
{
LogMessage(X_ERROR, "EXA(%d): driver's EXA version requirements "
"(%d.%d) are incompatible with EXA version (%d.%d)\n",
pScreen->myNum,
pScreenInfo->exa_major, pScreenInfo->exa_minor,
EXA_VERSION_MAJOR, EXA_VERSION_MINOR);
return FALSE;
}
#ifdef RENDER
PictureScreenPtr ps = GetPictureScreenIfSet(pScreen);
#endif
if (exaGeneration != serverGeneration)
{
exaScreenPrivateIndex = AllocateScreenPrivateIndex();
exaPixmapPrivateIndex = AllocatePixmapPrivateIndex();
exaGeneration = serverGeneration;
}
pExaScr = xcalloc (sizeof (ExaScreenPrivRec), 1);
if (!pExaScr) {
LogMessage(X_WARNING, "EXA(%d): Failed to allocate screen private\n",
pScreen->myNum);
return FALSE;
}
pExaScr->info = pScreenInfo;
pScreen->devPrivates[exaScreenPrivateIndex].ptr = (pointer) pExaScr;
pExaScr->migration = ExaMigrationGreedy;
exaDDXDriverInit(pScreen);
/*
* Replace various fb screen functions
*/
pExaScr->SavedCloseScreen = pScreen->CloseScreen;
pScreen->CloseScreen = exaCloseScreen;
pExaScr->SavedCreateGC = pScreen->CreateGC;
pScreen->CreateGC = exaCreateGC;
pExaScr->SavedGetImage = pScreen->GetImage;
pScreen->GetImage = exaGetImage;
pExaScr->SavedGetSpans = pScreen->GetSpans;
pScreen->GetSpans = exaGetSpans;
pExaScr->SavedCopyWindow = pScreen->CopyWindow;
pScreen->CopyWindow = exaCopyWindow;
pExaScr->SavedPaintWindowBackground = pScreen->PaintWindowBackground;
pScreen->PaintWindowBackground = exaPaintWindow;
pExaScr->SavedPaintWindowBorder = pScreen->PaintWindowBorder;
pScreen->PaintWindowBorder = exaPaintWindow;
pScreen->BackingStoreFuncs.SaveAreas = ExaCheckSaveAreas;
pScreen->BackingStoreFuncs.RestoreAreas = ExaCheckRestoreAreas;
#ifdef RENDER
if (ps) {
pExaScr->SavedComposite = ps->Composite;
ps->Composite = exaComposite;
pExaScr->SavedGlyphs = ps->Glyphs;
ps->Glyphs = exaGlyphs;
}
#endif
miDisableCompositeWrapper(pScreen);
/*
* Hookup offscreen pixmaps
*/
if ((pExaScr->info->flags & EXA_OFFSCREEN_PIXMAPS) &&
pExaScr->info->offScreenBase < pExaScr->info->memorySize)
{
if (!AllocatePixmapPrivate(pScreen, exaPixmapPrivateIndex,
sizeof (ExaPixmapPrivRec))) {
LogMessage(X_WARNING,
"EXA(%d): Failed to allocate pixmap private\n",
pScreen->myNum);
return FALSE;
}
pExaScr->SavedCreatePixmap = pScreen->CreatePixmap;
pScreen->CreatePixmap = exaCreatePixmap;
pExaScr->SavedDestroyPixmap = pScreen->DestroyPixmap;
pScreen->DestroyPixmap = exaDestroyPixmap;
}
else
{
LogMessage(X_INFO, "EXA(%d): No offscreen pixmaps\n", pScreen->myNum);
if (!AllocatePixmapPrivate(pScreen, exaPixmapPrivateIndex, 0))
return FALSE;
}
DBG_PIXMAP(("============== %ld < %ld\n", pExaScr->info->offScreenBase,
pExaScr->info->memorySize));
if (pExaScr->info->offScreenBase < pExaScr->info->memorySize) {
if (!exaOffscreenInit (pScreen)) {
LogMessage(X_WARNING, "EXA(%d): Offscreen pixmap setup failed\n",
pScreen->myNum);
return FALSE;
}
}
return TRUE;
}
/**
* exaDriverFini tears down EXA on a given screen.
*
* @param pScreen screen being torn down.
*/
void
exaDriverFini (ScreenPtr pScreen)
{
/*right now does nothing*/
}
/**
* exaMarkSync() should be called after any asynchronous drawing by the hardware.
*
* @param pScreen screen which drawing occurred on
*
* exaMarkSync() sets a flag to indicate that some asynchronous drawing has
* happened and a WaitSync() will be necessary before relying on the contents of
* offscreen memory from the CPU's perspective. It also calls an optional
* driver MarkSync() callback, the return value of which may be used to do partial
* synchronization with the hardware in the future.
*/
void exaMarkSync(ScreenPtr pScreen)
{
ExaScreenPriv(pScreen);
pExaScr->info->needsSync = TRUE;
if (pExaScr->info->MarkSync != NULL) {
pExaScr->info->lastMarker = (*pExaScr->info->MarkSync)(pScreen);
}
}
/**
* exaWaitSync() ensures that all drawing has been completed.
*
* @param pScreen screen being synchronized.
*
* Calls down into the driver to ensure that all previous drawing has completed.
* It should always be called before relying on the framebuffer contents
* reflecting previous drawing, from a CPU perspective.
*/
void exaWaitSync(ScreenPtr pScreen)
{
ExaScreenPriv(pScreen);
if (pExaScr->info->needsSync && !pExaScr->swappedOut) {
(*pExaScr->info->WaitMarker)(pScreen, pExaScr->info->lastMarker);
pExaScr->info->needsSync = FALSE;
}
}
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