xserver git update 15/5/2010

1 files changed, 696 insertions, 696 deletions

diff --git a/xorg-server/exa/exa_offscreen.c b/xorg-server/exa/exa_offscreen.c
index e3a9ab2f6..506da616d 100644
--- a/xorg-server/exa/exa_offscreen.c
+++ b/xorg-server/exa/exa_offscreen.c
@@ -1,696 +1,696 @@
-/*
- * Copyright © 2003 Anders Carlsson
- *
- * 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 Anders Carlsson not be used in
- * advertising or publicity pertaining to distribution of the software without
- * specific, written prior permission.  Anders Carlsson makes no
- * representations about the suitability of this software for any purpose.  It
- * is provided "as is" without express or implied warranty.
- *
- * ANDERS CARLSSON DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
- * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
- * EVENT SHALL ANDERS CARLSSON 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 allocator allocates blocks of memory by maintaining a list of areas.
- * When allocating, the contiguous block of areas with the minimum eviction
- * cost is found and evicted in order to make room for the new allocation.
- */
-
-#include "exa_priv.h"
-
-#include <limits.h>
-#include <assert.h>
-#include <stdlib.h>
-
-#if DEBUG_OFFSCREEN
-#define DBG_OFFSCREEN(a) ErrorF a
-#else
-#define DBG_OFFSCREEN(a)
-#endif
-
-#if DEBUG_OFFSCREEN
-static void
-ExaOffscreenValidate (ScreenPtr pScreen)
-{
-    ExaScreenPriv (pScreen);
-    ExaOffscreenArea *prev = 0, *area;
-
-    assert (pExaScr->info->offScreenAreas->base_offset == 
-	    pExaScr->info->offScreenBase);
-    for (area = pExaScr->info->offScreenAreas; area; area = area->next)
-    {
-	assert (area->offset >= area->base_offset &&
-		area->offset < (area->base_offset + area->size));
-	if (prev)
-	    assert (prev->base_offset + prev->size == area->base_offset);
-	prev = area;
-    }
-    assert (prev->base_offset + prev->size == pExaScr->info->memorySize);
-}
-#else
-#define ExaOffscreenValidate(s)
-#endif
-
-static ExaOffscreenArea *
-ExaOffscreenKickOut (ScreenPtr pScreen, ExaOffscreenArea *area)
-{
-    if (area->save)
-	(*area->save) (pScreen, area);
-    return exaOffscreenFree (pScreen, area);
-}
-
-static void
-exaUpdateEvictionCost(ExaOffscreenArea *area, unsigned offScreenCounter)
-{
-    unsigned age;
-
-    if (area->state == ExaOffscreenAvail)
-	return;
-
-    age = offScreenCounter - area->last_use;
-
-    /* This is unlikely to happen, but could result in a division by zero... */
-    if (age > (UINT_MAX / 2)) {
-	age = UINT_MAX / 2;
-	area->last_use = offScreenCounter - age;
-    }
-
-    area->eviction_cost = area->size / age;
-}
-
-static ExaOffscreenArea *
-exaFindAreaToEvict(ExaScreenPrivPtr pExaScr, int size, int align)
-{
-    ExaOffscreenArea *begin, *end, *best;
-    unsigned cost, best_cost;
-    int avail, real_size;
-
-    best_cost = UINT_MAX;
-    begin = end = pExaScr->info->offScreenAreas;
-    avail = 0;
-    cost = 0;
-    best = 0;
-
-    while (end != NULL)
-    {
-	restart:
-	while (begin != NULL && begin->state == ExaOffscreenLocked)
-	    begin = end = begin->next;
-
-	if (begin == NULL)
-	    break;
-
-	/* adjust size needed to account for alignment loss for this area */
-	real_size = size + (begin->base_offset + begin->size - size) % align;
-
-	while (avail < real_size && end != NULL)
-	{
-	    if (end->state == ExaOffscreenLocked) {
-		/* Can't more room here, restart after this locked area */
-		avail = 0;
-		cost = 0;
-		begin = end;
-		goto restart;
-	    }
-	    avail += end->size;
-	    exaUpdateEvictionCost(end, pExaScr->offScreenCounter);
-	    cost += end->eviction_cost;
-	    end = end->next;
-	}
-
-	/* Check the cost, update best */
-	if (avail >= real_size && cost < best_cost) {
-	    best = begin;
-	    best_cost = cost;
-	}
-
-	avail -= begin->size;
-	cost -= begin->eviction_cost;
-	begin = begin->next;
-    }
-
-    return best;
-}
-
-/**
- * exaOffscreenAlloc allocates offscreen memory
- *
- * @param pScreen current screen
- * @param size size in bytes of the allocation
- * @param align byte alignment requirement for the offset of the allocated area
- * @param locked whether the allocated area is locked and can't be kicked out
- * @param save callback for when the area is evicted from memory
- * @param privdata private data for the save callback.
- *
- * Allocates offscreen memory from the device associated with pScreen.  size
- * and align deteremine where and how large the allocated area is, and locked
- * will mark whether it should be held in card memory.  privdata may be any
- * pointer for the save callback when the area is removed.
- *
- * Note that locked areas do get evicted on VT switch unless the driver
- * requested version 2.1 or newer behavior.  In that case, the save callback is
- * still called.
- */
-ExaOffscreenArea *
-exaOffscreenAlloc (ScreenPtr pScreen, int size, int align,
-                   Bool locked,
-                   ExaOffscreenSaveProc save,
-                   pointer privData)
-{
-    ExaOffscreenArea *area;
-    ExaScreenPriv (pScreen);
-    int real_size = 0, largest_avail = 0;
-#if DEBUG_OFFSCREEN
-    static int number = 0;
-    ErrorF("================= ============ allocating a new pixmap %d\n", ++number);
-#endif
-
-    ExaOffscreenValidate (pScreen);
-    if (!align)
-	align = 1;
-
-    if (!size)
-    {
-	DBG_OFFSCREEN (("Alloc 0x%x -> EMPTY\n", size));
-	return NULL;
-    }
-
-    /* throw out requests that cannot fit */
-    if (size > (pExaScr->info->memorySize - pExaScr->info->offScreenBase))
-    {
-	DBG_OFFSCREEN (("Alloc 0x%x vs (0x%lx) -> TOBIG\n", size,
-			pExaScr->info->memorySize -
-			pExaScr->info->offScreenBase));
-	return NULL;
-    }
-
-    /* Try to find a free space that'll fit. */
-    for (area = pExaScr->info->offScreenAreas; area; area = area->next)
-    {
-	/* skip allocated areas */
-	if (area->state != ExaOffscreenAvail)
-	    continue;
-
-	/* adjust size to match alignment requirement */
-	real_size = size + (area->base_offset + area->size - size) % align;
-
-	/* does it fit? */
-	if (real_size <= area->size)
-	    break;
-
-	if (area->size > largest_avail)
-	    largest_avail = area->size;
-    }
-
-    if (!area)
-    {
-	area = exaFindAreaToEvict(pExaScr, size, align);
-
-	if (!area)
-	{
-	    DBG_OFFSCREEN (("Alloc 0x%x -> NOSPACE\n", size));
-	    /* Could not allocate memory */
-	    ExaOffscreenValidate (pScreen);
-	    return NULL;
-	}
-
-	/* adjust size needed to account for alignment loss for this area */
-	real_size = size + (area->base_offset + area->size - size) % align;
-
-	/*
-	 * Kick out first area if in use
-	 */
-	if (area->state != ExaOffscreenAvail)
-	    area = ExaOffscreenKickOut (pScreen, area);
-	/*
-	 * Now get the system to merge the other needed areas together
-	 */
-	while (area->size < real_size)
-	{
-	    assert (area->next && area->next->state == ExaOffscreenRemovable);
-	    (void) ExaOffscreenKickOut (pScreen, area->next);
-	}
-    }
-
-    /* save extra space in new area */
-    if (real_size < area->size)
-    {
-	ExaOffscreenArea   *new_area = xalloc (sizeof (ExaOffscreenArea));
-	if (!new_area)
-	    return NULL;
-	new_area->base_offset = area->base_offset;
-
-	new_area->offset = new_area->base_offset;
-	new_area->align = 0;
-	new_area->size = area->size - real_size;
-	new_area->state = ExaOffscreenAvail;
-	new_area->save = NULL;
-	new_area->last_use = 0;
-	new_area->eviction_cost = 0;
-	new_area->next = area;
-	new_area->prev = area->prev;
-	if (area->prev->next)
-	    area->prev->next = new_area;
-	else
-	    pExaScr->info->offScreenAreas = new_area;
-	area->prev = new_area;
-	area->base_offset = new_area->base_offset + new_area->size;
-	area->size = real_size;
-    } else
-	pExaScr->numOffscreenAvailable--;
-
-    /*
-     * Mark this area as in use
-     */
-    if (locked)
-	area->state = ExaOffscreenLocked;
-    else
-	area->state = ExaOffscreenRemovable;
-    area->privData = privData;
-    area->save = save;
-    area->last_use = pExaScr->offScreenCounter++;
-    area->offset = (area->base_offset + align - 1);
-    area->offset -= area->offset % align;
-    area->align = align;
-
-    ExaOffscreenValidate (pScreen);
-
-    DBG_OFFSCREEN (("Alloc 0x%x -> 0x%x (0x%x)\n", size,
-		    area->base_offset, area->offset));
-    return area;
-}
-
-/**
- * Ejects all offscreen areas, and uninitializes the offscreen memory manager.
- */
-void
-ExaOffscreenSwapOut (ScreenPtr pScreen)
-{
-    ExaScreenPriv (pScreen);
-
-    ExaOffscreenValidate (pScreen);
-    /* loop until a single free area spans the space */
-    for (;;)
-    {
-	ExaOffscreenArea *area = pExaScr->info->offScreenAreas;
-
-	if (!area)
-	    break;
-	if (area->state == ExaOffscreenAvail)
-	{
-	    area = area->next;
-	    if (!area)
-		break;
-	}
-	assert (area->state != ExaOffscreenAvail);
-	(void) ExaOffscreenKickOut (pScreen, area);
-	ExaOffscreenValidate (pScreen);
-    }
-    ExaOffscreenValidate (pScreen);
-    ExaOffscreenFini (pScreen);
-}
-
-/** Ejects all pixmaps managed by EXA. */
-static void
-ExaOffscreenEjectPixmaps (ScreenPtr pScreen)
-{
-    ExaScreenPriv (pScreen);
-
-    ExaOffscreenValidate (pScreen);
-    /* loop until a single free area spans the space */
-    for (;;)
-    {
-	ExaOffscreenArea *area;
-
-	for (area = pExaScr->info->offScreenAreas; area != NULL;
-	     area = area->next)
-	{
-	    if (area->state == ExaOffscreenRemovable &&
-		area->save == exaPixmapSave)
-	    {
-		(void) ExaOffscreenKickOut (pScreen, area);
-		ExaOffscreenValidate (pScreen);
-		break;
-	    }
-	}
-	if (area == NULL)
-	    break;
-    }
-    ExaOffscreenValidate (pScreen);
-}
-
-void
-ExaOffscreenSwapIn (ScreenPtr pScreen)
-{
-    exaOffscreenInit (pScreen);
-}
-
-/**
- * Prepares EXA for disabling of FB access, or restoring it.
- *
- * In version 2.1, the disabling results in pixmaps being ejected, while other
- * allocations remain.  With this plus the prevention of migration while
- * swappedOut is set, EXA by itself should not cause any access of the
- * framebuffer to occur while swapped out.  Any remaining issues are the
- * responsibility of the driver.
- *
- * Prior to version 2.1, all allocations, including locked ones, are ejected
- * when access is disabled, and the allocator is torn down while swappedOut
- * is set.  This is more drastic, and caused implementation difficulties for
- * many drivers that could otherwise handle the lack of FB access while
- * swapped out.
- */
-void
-exaEnableDisableFBAccess (int index, Bool enable)
-{
-    ScreenPtr pScreen = screenInfo.screens[index];
-    ExaScreenPriv (pScreen);
-
-    if (pExaScr->info->flags & EXA_HANDLES_PIXMAPS)
-	return;
-
-    if (!enable && pExaScr->disableFbCount++ == 0) {
-	if (pExaScr->info->exa_minor < 1)
-	    ExaOffscreenSwapOut (pScreen);
-	else
-	    ExaOffscreenEjectPixmaps (pScreen);
-	pExaScr->swappedOut = TRUE;
-    }
-    
-    if (enable && --pExaScr->disableFbCount == 0) {
-	if (pExaScr->info->exa_minor < 1)
-	    ExaOffscreenSwapIn (pScreen);
-	pExaScr->swappedOut = FALSE;
-    }
-}
-
-/* merge the next free area into this one */
-static void
-ExaOffscreenMerge (ExaScreenPrivPtr pExaScr, ExaOffscreenArea *area)
-{
-    ExaOffscreenArea	*next = area->next;
-
-    /* account for space */
-    area->size += next->size;
-    /* frob pointer */
-    area->next = next->next;
-    if (area->next)
-	area->next->prev = area;
-    else
-	pExaScr->info->offScreenAreas->prev = area;
-    xfree (next);
-
-    pExaScr->numOffscreenAvailable--;
-}
-
-/**
- * exaOffscreenFree frees an allocation.
- *
- * @param pScreen current screen
- * @param area offscreen area to free
- *
- * exaOffscreenFree frees an allocation created by exaOffscreenAlloc.  Note that
- * the save callback of the area is not called, and it is up to the driver to
- * do any cleanup necessary as a result.
- *
- * @return pointer to the newly freed area. This behavior should not be relied
- * on.
- */
-ExaOffscreenArea *
-exaOffscreenFree (ScreenPtr pScreen, ExaOffscreenArea *area)
-{
-    ExaScreenPriv(pScreen);
-    ExaOffscreenArea	*next = area->next;
-    ExaOffscreenArea	*prev;
-
-    DBG_OFFSCREEN (("Free 0x%x -> 0x%x (0x%x)\n", area->size,
-		    area->base_offset, area->offset));
-    ExaOffscreenValidate (pScreen);
-
-    area->state = ExaOffscreenAvail;
-    area->save = NULL;
-    area->last_use = 0;
-    area->eviction_cost = 0;
-    /*
-     * Find previous area
-     */
-    if (area == pExaScr->info->offScreenAreas)
-	prev = NULL;
-    else
-	prev = area->prev;
-
-    pExaScr->numOffscreenAvailable++;
-
-    /* link with next area if free */
-    if (next && next->state == ExaOffscreenAvail)
-	ExaOffscreenMerge (pExaScr, area);
-
-    /* link with prev area if free */
-    if (prev && prev->state == ExaOffscreenAvail)
-    {
-	area = prev;
-	ExaOffscreenMerge (pExaScr, area);
-    }
-
-    ExaOffscreenValidate (pScreen);
-    DBG_OFFSCREEN(("\tdone freeing\n"));
-    return area;
-}
-
-void
-ExaOffscreenMarkUsed (PixmapPtr pPixmap)
-{
-    ExaPixmapPriv (pPixmap);
-    ExaScreenPriv (pPixmap->drawable.pScreen);
-
-    if (!pExaPixmap || !pExaPixmap->area)
-	return;
-
-    pExaPixmap->area->last_use = pExaScr->offScreenCounter++;
-}
-
-/**
- * Defragment offscreen memory by compacting allocated areas at the end of it,
- * leaving the total amount of memory available as a single area at the
- * beginning (when there are no pinned allocations).
- */
-_X_HIDDEN ExaOffscreenArea*
-ExaOffscreenDefragment (ScreenPtr pScreen)
-{
-    ExaScreenPriv (pScreen);
-    ExaOffscreenArea *area, *largest_available = NULL;
-    int largest_size = 0;
-    PixmapPtr pDstPix;
-    ExaPixmapPrivPtr pExaDstPix;
-
-    pDstPix = (*pScreen->CreatePixmap) (pScreen, 0, 0, 0, 0);
-
-    if (!pDstPix)
-	return NULL;
-
-    pExaDstPix = ExaGetPixmapPriv (pDstPix);
-    pExaDstPix->use_gpu_copy = TRUE;
-
-    for (area = pExaScr->info->offScreenAreas->prev;
-	 area != pExaScr->info->offScreenAreas;
-	 )
-    {
-	ExaOffscreenArea *prev = area->prev;
-	PixmapPtr pSrcPix;
-	ExaPixmapPrivPtr pExaSrcPix;
-	Bool save_use_gpu_copy;
-	int save_pitch;
-
-	if (area->state != ExaOffscreenAvail ||
-	    prev->state == ExaOffscreenLocked ||
-	    (prev->state == ExaOffscreenRemovable &&
-	     prev->save != exaPixmapSave)) {
-	    area = prev;
-	    continue;
-	}
-
-	if (prev->state == ExaOffscreenAvail) {
-	    if (area == largest_available) {
-		largest_available = prev;
-		largest_size += prev->size;
-	    }
-	    area = prev;
-	    ExaOffscreenMerge (pExaScr, area);
-	    continue;
-	}
-
-	if (area->size > largest_size) {
-	    largest_available = area;
-	    largest_size = area->size;
-	}
-
-	pSrcPix = prev->privData;
-	pExaSrcPix = ExaGetPixmapPriv (pSrcPix);
-
-	pExaDstPix->fb_ptr = pExaScr->info->memoryBase +
-	    area->base_offset + area->size - prev->size + prev->base_offset -
-	    prev->offset;
-	pExaDstPix->fb_ptr -= (unsigned long)pExaDstPix->fb_ptr % prev->align;
-
-	if (pExaDstPix->fb_ptr <= pExaSrcPix->fb_ptr) {
-	    area = prev;
-	    continue;
-	}
-
-	if (!(pExaScr->info->flags & EXA_SUPPORTS_OFFSCREEN_OVERLAPS) &&
-	    (pExaSrcPix->fb_ptr + prev->size) > pExaDstPix->fb_ptr) {
-	    area = prev;
-	    continue;
-	}
-
-	save_use_gpu_copy = pExaSrcPix->use_gpu_copy;
-	save_pitch = pSrcPix->devKind;
-
-	pExaSrcPix->use_gpu_copy = TRUE;
-	pSrcPix->devKind = pExaSrcPix->fb_pitch;
-
-	pDstPix->drawable.width = pSrcPix->drawable.width;
-	pDstPix->devKind = pSrcPix->devKind;
-	pDstPix->drawable.height = pSrcPix->drawable.height;
-	pDstPix->drawable.depth = pSrcPix->drawable.depth;
-	pDstPix->drawable.bitsPerPixel = pSrcPix->drawable.bitsPerPixel;
-
-	if (!pExaScr->info->PrepareCopy (pSrcPix, pDstPix, -1, -1, GXcopy, ~0)) {
-	    pExaSrcPix->use_gpu_copy = save_use_gpu_copy;
-	    pSrcPix->devKind = save_pitch;
-	    area = prev;
-	    continue;
-	}
-
-	pExaScr->info->Copy (pDstPix, 0, 0, 0, 0, pDstPix->drawable.width,
-			     pDstPix->drawable.height);
-	pExaScr->info->DoneCopy (pDstPix);
-	exaMarkSync (pScreen);
-
-	DBG_OFFSCREEN(("Before swap: prev=0x%08x-0x%08x-0x%08x area=0x%08x-0x%08x-0x%08x\n",
-		       prev->base_offset, prev->offset, prev->base_offset + prev->size,
-		       area->base_offset, area->offset, area->base_offset + area->size));
-
-	/* Calculate swapped area offsets and sizes */
-	area->base_offset = prev->base_offset;
-	area->offset = area->base_offset;
-	prev->offset += pExaDstPix->fb_ptr - pExaSrcPix->fb_ptr;
-	assert(prev->offset >= pExaScr->info->offScreenBase &&
-	       prev->offset < pExaScr->info->memorySize);
-	prev->base_offset = prev->offset;
-	if (area->next)
-	    prev->size = area->next->base_offset - prev->base_offset;
-	else
-	    prev->size = pExaScr->info->memorySize - prev->base_offset;
-	area->size = prev->base_offset - area->base_offset;
-
-	DBG_OFFSCREEN(("After swap: area=0x%08x-0x%08x-0x%08x prev=0x%08x-0x%08x-0x%08x\n",
-		       area->base_offset, area->offset, area->base_offset + area->size,
-		       prev->base_offset, prev->offset, prev->base_offset + prev->size));
-
-	/* Swap areas in list */
-	if (area->next)
-	    area->next->prev = prev;
-	else
-	    pExaScr->info->offScreenAreas->prev = prev;
-	if (prev->prev->next)
-	    prev->prev->next = area;
-	else
-	    pExaScr->info->offScreenAreas = area;
-	prev->next = area->next;
-	area->next = prev;
-	area->prev = prev->prev;
-	prev->prev = area;
-	if (!area->prev->next)
-	    pExaScr->info->offScreenAreas = area;
-
-#if DEBUG_OFFSCREEN
-	if (prev->prev == prev || prev->next == prev)
-	    ErrorF("Whoops, prev points to itself!\n");
-
-	if (area->prev == area || area->next == area)
-	    ErrorF("Whoops, area points to itself!\n");
-#endif
-
-	pExaSrcPix->fb_ptr = pExaDstPix->fb_ptr;
-	pExaSrcPix->use_gpu_copy = save_use_gpu_copy;
-	pSrcPix->devKind = save_pitch;
-    }
-
-    pDstPix->drawable.width = 0;
-    pDstPix->drawable.height = 0;
-    pDstPix->drawable.depth = 0;
-    pDstPix->drawable.bitsPerPixel = 0;
-
-    (*pScreen->DestroyPixmap) (pDstPix);
-
-    if (area->state == ExaOffscreenAvail && area->size > largest_size)
-	return area;
-
-    return largest_available;
-}
-
-/**
- * exaOffscreenInit initializes the offscreen memory manager.
- *
- * @param pScreen current screen
- *
- * exaOffscreenInit is called by exaDriverInit to set up the memory manager for
- * the screen, if any offscreen memory is available.
- */
-Bool
-exaOffscreenInit (ScreenPtr pScreen)
-{
-    ExaScreenPriv (pScreen);
-    ExaOffscreenArea *area;
-
-    /* Allocate a big free area */
-    area = xalloc (sizeof (ExaOffscreenArea));
-
-    if (!area)
-	return FALSE;
-
-    area->state = ExaOffscreenAvail;
-    area->base_offset = pExaScr->info->offScreenBase;
-    area->offset = area->base_offset;
-    area->align = 0;
-    area->size = pExaScr->info->memorySize - area->base_offset;
-    area->save = NULL;
-    area->next = NULL;
-    area->prev = area;
-    area->last_use = 0;
-    area->eviction_cost = 0;
-
-    /* Add it to the free areas */
-    pExaScr->info->offScreenAreas = area;
-    pExaScr->offScreenCounter = 1;
-    pExaScr->numOffscreenAvailable = 1;
-
-    ExaOffscreenValidate (pScreen);
-
-    return TRUE;
-}
-
-void
-ExaOffscreenFini (ScreenPtr pScreen)
-{
-    ExaScreenPriv (pScreen);
-    ExaOffscreenArea *area;
-
-    /* just free all of the area records */
-    while ((area = pExaScr->info->offScreenAreas))
-    {
-	pExaScr->info->offScreenAreas = area->next;
-	xfree (area);
-    }
-}
+/*

+ * Copyright © 2003 Anders Carlsson

+ *

+ * 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 Anders Carlsson not be used in

+ * advertising or publicity pertaining to distribution of the software without

+ * specific, written prior permission.  Anders Carlsson makes no

+ * representations about the suitability of this software for any purpose.  It

+ * is provided "as is" without express or implied warranty.

+ *

+ * ANDERS CARLSSON DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,

+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO

+ * EVENT SHALL ANDERS CARLSSON 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 allocator allocates blocks of memory by maintaining a list of areas.

+ * When allocating, the contiguous block of areas with the minimum eviction

+ * cost is found and evicted in order to make room for the new allocation.

+ */

+

+#include "exa_priv.h"

+

+#include <limits.h>

+#include <assert.h>

+#include <stdlib.h>

+

+#if DEBUG_OFFSCREEN

+#define DBG_OFFSCREEN(a) ErrorF a

+#else

+#define DBG_OFFSCREEN(a)

+#endif

+

+#if DEBUG_OFFSCREEN

+static void

+ExaOffscreenValidate (ScreenPtr pScreen)

+{

+    ExaScreenPriv (pScreen);

+    ExaOffscreenArea *prev = 0, *area;

+

+    assert (pExaScr->info->offScreenAreas->base_offset == 

+	    pExaScr->info->offScreenBase);

+    for (area = pExaScr->info->offScreenAreas; area; area = area->next)

+    {

+	assert (area->offset >= area->base_offset &&

+		area->offset < (area->base_offset + area->size));

+	if (prev)

+	    assert (prev->base_offset + prev->size == area->base_offset);

+	prev = area;

+    }

+    assert (prev->base_offset + prev->size == pExaScr->info->memorySize);

+}

+#else

+#define ExaOffscreenValidate(s)

+#endif

+

+static ExaOffscreenArea *

+ExaOffscreenKickOut (ScreenPtr pScreen, ExaOffscreenArea *area)

+{

+    if (area->save)

+	(*area->save) (pScreen, area);

+    return exaOffscreenFree (pScreen, area);

+}

+

+static void

+exaUpdateEvictionCost(ExaOffscreenArea *area, unsigned offScreenCounter)

+{

+    unsigned age;

+

+    if (area->state == ExaOffscreenAvail)

+	return;

+

+    age = offScreenCounter - area->last_use;

+

+    /* This is unlikely to happen, but could result in a division by zero... */

+    if (age > (UINT_MAX / 2)) {

+	age = UINT_MAX / 2;

+	area->last_use = offScreenCounter - age;

+    }

+

+    area->eviction_cost = area->size / age;

+}

+

+static ExaOffscreenArea *

+exaFindAreaToEvict(ExaScreenPrivPtr pExaScr, int size, int align)

+{

+    ExaOffscreenArea *begin, *end, *best;

+    unsigned cost, best_cost;

+    int avail, real_size;

+

+    best_cost = UINT_MAX;

+    begin = end = pExaScr->info->offScreenAreas;

+    avail = 0;

+    cost = 0;

+    best = 0;

+

+    while (end != NULL)

+    {

+	restart:

+	while (begin != NULL && begin->state == ExaOffscreenLocked)

+	    begin = end = begin->next;

+

+	if (begin == NULL)

+	    break;

+

+	/* adjust size needed to account for alignment loss for this area */

+	real_size = size + (begin->base_offset + begin->size - size) % align;

+

+	while (avail < real_size && end != NULL)

+	{

+	    if (end->state == ExaOffscreenLocked) {

+		/* Can't more room here, restart after this locked area */

+		avail = 0;

+		cost = 0;

+		begin = end;

+		goto restart;

+	    }

+	    avail += end->size;

+	    exaUpdateEvictionCost(end, pExaScr->offScreenCounter);

+	    cost += end->eviction_cost;

+	    end = end->next;

+	}

+

+	/* Check the cost, update best */

+	if (avail >= real_size && cost < best_cost) {

+	    best = begin;

+	    best_cost = cost;

+	}

+

+	avail -= begin->size;

+	cost -= begin->eviction_cost;

+	begin = begin->next;

+    }

+

+    return best;

+}

+

+/**

+ * exaOffscreenAlloc allocates offscreen memory

+ *

+ * @param pScreen current screen

+ * @param size size in bytes of the allocation

+ * @param align byte alignment requirement for the offset of the allocated area

+ * @param locked whether the allocated area is locked and can't be kicked out

+ * @param save callback for when the area is evicted from memory

+ * @param privdata private data for the save callback.

+ *

+ * Allocates offscreen memory from the device associated with pScreen.  size

+ * and align deteremine where and how large the allocated area is, and locked

+ * will mark whether it should be held in card memory.  privdata may be any

+ * pointer for the save callback when the area is removed.

+ *

+ * Note that locked areas do get evicted on VT switch unless the driver

+ * requested version 2.1 or newer behavior.  In that case, the save callback is

+ * still called.

+ */

+ExaOffscreenArea *

+exaOffscreenAlloc (ScreenPtr pScreen, int size, int align,

+                   Bool locked,

+                   ExaOffscreenSaveProc save,

+                   pointer privData)

+{

+    ExaOffscreenArea *area;

+    ExaScreenPriv (pScreen);

+    int real_size = 0, largest_avail = 0;

+#if DEBUG_OFFSCREEN

+    static int number = 0;

+    ErrorF("================= ============ allocating a new pixmap %d\n", ++number);

+#endif

+

+    ExaOffscreenValidate (pScreen);

+    if (!align)

+	align = 1;

+

+    if (!size)

+    {

+	DBG_OFFSCREEN (("Alloc 0x%x -> EMPTY\n", size));

+	return NULL;

+    }

+

+    /* throw out requests that cannot fit */

+    if (size > (pExaScr->info->memorySize - pExaScr->info->offScreenBase))

+    {

+	DBG_OFFSCREEN (("Alloc 0x%x vs (0x%lx) -> TOBIG\n", size,

+			pExaScr->info->memorySize -

+			pExaScr->info->offScreenBase));

+	return NULL;

+    }

+

+    /* Try to find a free space that'll fit. */

+    for (area = pExaScr->info->offScreenAreas; area; area = area->next)

+    {

+	/* skip allocated areas */

+	if (area->state != ExaOffscreenAvail)

+	    continue;

+

+	/* adjust size to match alignment requirement */

+	real_size = size + (area->base_offset + area->size - size) % align;

+

+	/* does it fit? */

+	if (real_size <= area->size)

+	    break;

+

+	if (area->size > largest_avail)

+	    largest_avail = area->size;

+    }

+

+    if (!area)

+    {

+	area = exaFindAreaToEvict(pExaScr, size, align);

+

+	if (!area)

+	{

+	    DBG_OFFSCREEN (("Alloc 0x%x -> NOSPACE\n", size));

+	    /* Could not allocate memory */

+	    ExaOffscreenValidate (pScreen);

+	    return NULL;

+	}

+

+	/* adjust size needed to account for alignment loss for this area */

+	real_size = size + (area->base_offset + area->size - size) % align;

+

+	/*

+	 * Kick out first area if in use

+	 */

+	if (area->state != ExaOffscreenAvail)

+	    area = ExaOffscreenKickOut (pScreen, area);

+	/*

+	 * Now get the system to merge the other needed areas together

+	 */

+	while (area->size < real_size)

+	{

+	    assert (area->next && area->next->state == ExaOffscreenRemovable);

+	    (void) ExaOffscreenKickOut (pScreen, area->next);

+	}

+    }

+

+    /* save extra space in new area */

+    if (real_size < area->size)

+    {

+	ExaOffscreenArea   *new_area = malloc(sizeof (ExaOffscreenArea));

+	if (!new_area)

+	    return NULL;

+	new_area->base_offset = area->base_offset;

+

+	new_area->offset = new_area->base_offset;

+	new_area->align = 0;

+	new_area->size = area->size - real_size;

+	new_area->state = ExaOffscreenAvail;

+	new_area->save = NULL;

+	new_area->last_use = 0;

+	new_area->eviction_cost = 0;

+	new_area->next = area;

+	new_area->prev = area->prev;

+	if (area->prev->next)

+	    area->prev->next = new_area;

+	else

+	    pExaScr->info->offScreenAreas = new_area;

+	area->prev = new_area;

+	area->base_offset = new_area->base_offset + new_area->size;

+	area->size = real_size;

+    } else

+	pExaScr->numOffscreenAvailable--;

+

+    /*

+     * Mark this area as in use

+     */

+    if (locked)

+	area->state = ExaOffscreenLocked;

+    else

+	area->state = ExaOffscreenRemovable;

+    area->privData = privData;

+    area->save = save;

+    area->last_use = pExaScr->offScreenCounter++;

+    area->offset = (area->base_offset + align - 1);

+    area->offset -= area->offset % align;

+    area->align = align;

+

+    ExaOffscreenValidate (pScreen);

+

+    DBG_OFFSCREEN (("Alloc 0x%x -> 0x%x (0x%x)\n", size,

+		    area->base_offset, area->offset));

+    return area;

+}

+

+/**

+ * Ejects all offscreen areas, and uninitializes the offscreen memory manager.

+ */

+void

+ExaOffscreenSwapOut (ScreenPtr pScreen)

+{

+    ExaScreenPriv (pScreen);

+

+    ExaOffscreenValidate (pScreen);

+    /* loop until a single free area spans the space */

+    for (;;)

+    {

+	ExaOffscreenArea *area = pExaScr->info->offScreenAreas;

+

+	if (!area)

+	    break;

+	if (area->state == ExaOffscreenAvail)

+	{

+	    area = area->next;

+	    if (!area)

+		break;

+	}

+	assert (area->state != ExaOffscreenAvail);

+	(void) ExaOffscreenKickOut (pScreen, area);

+	ExaOffscreenValidate (pScreen);

+    }

+    ExaOffscreenValidate (pScreen);

+    ExaOffscreenFini (pScreen);

+}

+

+/** Ejects all pixmaps managed by EXA. */

+static void

+ExaOffscreenEjectPixmaps (ScreenPtr pScreen)

+{

+    ExaScreenPriv (pScreen);

+

+    ExaOffscreenValidate (pScreen);

+    /* loop until a single free area spans the space */

+    for (;;)

+    {

+	ExaOffscreenArea *area;

+

+	for (area = pExaScr->info->offScreenAreas; area != NULL;

+	     area = area->next)

+	{

+	    if (area->state == ExaOffscreenRemovable &&

+		area->save == exaPixmapSave)

+	    {

+		(void) ExaOffscreenKickOut (pScreen, area);

+		ExaOffscreenValidate (pScreen);

+		break;

+	    }

+	}

+	if (area == NULL)

+	    break;

+    }

+    ExaOffscreenValidate (pScreen);

+}

+

+void

+ExaOffscreenSwapIn (ScreenPtr pScreen)

+{

+    exaOffscreenInit (pScreen);

+}

+

+/**

+ * Prepares EXA for disabling of FB access, or restoring it.

+ *

+ * In version 2.1, the disabling results in pixmaps being ejected, while other

+ * allocations remain.  With this plus the prevention of migration while

+ * swappedOut is set, EXA by itself should not cause any access of the

+ * framebuffer to occur while swapped out.  Any remaining issues are the

+ * responsibility of the driver.

+ *

+ * Prior to version 2.1, all allocations, including locked ones, are ejected

+ * when access is disabled, and the allocator is torn down while swappedOut

+ * is set.  This is more drastic, and caused implementation difficulties for

+ * many drivers that could otherwise handle the lack of FB access while

+ * swapped out.

+ */

+void

+exaEnableDisableFBAccess (int index, Bool enable)

+{

+    ScreenPtr pScreen = screenInfo.screens[index];

+    ExaScreenPriv (pScreen);

+

+    if (pExaScr->info->flags & EXA_HANDLES_PIXMAPS)

+	return;

+

+    if (!enable && pExaScr->disableFbCount++ == 0) {

+	if (pExaScr->info->exa_minor < 1)

+	    ExaOffscreenSwapOut (pScreen);

+	else

+	    ExaOffscreenEjectPixmaps (pScreen);

+	pExaScr->swappedOut = TRUE;

+    }

+    

+    if (enable && --pExaScr->disableFbCount == 0) {

+	if (pExaScr->info->exa_minor < 1)

+	    ExaOffscreenSwapIn (pScreen);

+	pExaScr->swappedOut = FALSE;

+    }

+}

+

+/* merge the next free area into this one */

+static void

+ExaOffscreenMerge (ExaScreenPrivPtr pExaScr, ExaOffscreenArea *area)

+{

+    ExaOffscreenArea	*next = area->next;

+

+    /* account for space */

+    area->size += next->size;

+    /* frob pointer */

+    area->next = next->next;

+    if (area->next)

+	area->next->prev = area;

+    else

+	pExaScr->info->offScreenAreas->prev = area;

+    free(next);

+

+    pExaScr->numOffscreenAvailable--;

+}

+

+/**

+ * exaOffscreenFree frees an allocation.

+ *

+ * @param pScreen current screen

+ * @param area offscreen area to free

+ *

+ * exaOffscreenFree frees an allocation created by exaOffscreenAlloc.  Note that

+ * the save callback of the area is not called, and it is up to the driver to

+ * do any cleanup necessary as a result.

+ *

+ * @return pointer to the newly freed area. This behavior should not be relied

+ * on.

+ */

+ExaOffscreenArea *

+exaOffscreenFree (ScreenPtr pScreen, ExaOffscreenArea *area)

+{

+    ExaScreenPriv(pScreen);

+    ExaOffscreenArea	*next = area->next;

+    ExaOffscreenArea	*prev;

+

+    DBG_OFFSCREEN (("Free 0x%x -> 0x%x (0x%x)\n", area->size,

+		    area->base_offset, area->offset));

+    ExaOffscreenValidate (pScreen);

+

+    area->state = ExaOffscreenAvail;

+    area->save = NULL;

+    area->last_use = 0;

+    area->eviction_cost = 0;

+    /*

+     * Find previous area

+     */

+    if (area == pExaScr->info->offScreenAreas)

+	prev = NULL;

+    else

+	prev = area->prev;

+

+    pExaScr->numOffscreenAvailable++;

+

+    /* link with next area if free */

+    if (next && next->state == ExaOffscreenAvail)

+	ExaOffscreenMerge (pExaScr, area);

+

+    /* link with prev area if free */

+    if (prev && prev->state == ExaOffscreenAvail)

+    {

+	area = prev;

+	ExaOffscreenMerge (pExaScr, area);

+    }

+

+    ExaOffscreenValidate (pScreen);

+    DBG_OFFSCREEN(("\tdone freeing\n"));

+    return area;

+}

+

+void

+ExaOffscreenMarkUsed (PixmapPtr pPixmap)

+{

+    ExaPixmapPriv (pPixmap);

+    ExaScreenPriv (pPixmap->drawable.pScreen);

+

+    if (!pExaPixmap || !pExaPixmap->area)

+	return;

+

+    pExaPixmap->area->last_use = pExaScr->offScreenCounter++;

+}

+

+/**

+ * Defragment offscreen memory by compacting allocated areas at the end of it,

+ * leaving the total amount of memory available as a single area at the

+ * beginning (when there are no pinned allocations).

+ */

+_X_HIDDEN ExaOffscreenArea*

+ExaOffscreenDefragment (ScreenPtr pScreen)

+{

+    ExaScreenPriv (pScreen);

+    ExaOffscreenArea *area, *largest_available = NULL;

+    int largest_size = 0;

+    PixmapPtr pDstPix;

+    ExaPixmapPrivPtr pExaDstPix;

+

+    pDstPix = (*pScreen->CreatePixmap) (pScreen, 0, 0, 0, 0);

+

+    if (!pDstPix)

+	return NULL;

+

+    pExaDstPix = ExaGetPixmapPriv (pDstPix);

+    pExaDstPix->use_gpu_copy = TRUE;

+

+    for (area = pExaScr->info->offScreenAreas->prev;

+	 area != pExaScr->info->offScreenAreas;

+	 )

+    {

+	ExaOffscreenArea *prev = area->prev;

+	PixmapPtr pSrcPix;

+	ExaPixmapPrivPtr pExaSrcPix;

+	Bool save_use_gpu_copy;

+	int save_pitch;

+

+	if (area->state != ExaOffscreenAvail ||

+	    prev->state == ExaOffscreenLocked ||

+	    (prev->state == ExaOffscreenRemovable &&

+	     prev->save != exaPixmapSave)) {

+	    area = prev;

+	    continue;

+	}

+

+	if (prev->state == ExaOffscreenAvail) {

+	    if (area == largest_available) {

+		largest_available = prev;

+		largest_size += prev->size;

+	    }

+	    area = prev;

+	    ExaOffscreenMerge (pExaScr, area);

+	    continue;

+	}

+

+	if (area->size > largest_size) {

+	    largest_available = area;

+	    largest_size = area->size;

+	}

+

+	pSrcPix = prev->privData;

+	pExaSrcPix = ExaGetPixmapPriv (pSrcPix);

+

+	pExaDstPix->fb_ptr = pExaScr->info->memoryBase +

+	    area->base_offset + area->size - prev->size + prev->base_offset -

+	    prev->offset;

+	pExaDstPix->fb_ptr -= (unsigned long)pExaDstPix->fb_ptr % prev->align;

+

+	if (pExaDstPix->fb_ptr <= pExaSrcPix->fb_ptr) {

+	    area = prev;

+	    continue;

+	}

+

+	if (!(pExaScr->info->flags & EXA_SUPPORTS_OFFSCREEN_OVERLAPS) &&

+	    (pExaSrcPix->fb_ptr + prev->size) > pExaDstPix->fb_ptr) {

+	    area = prev;

+	    continue;

+	}

+

+	save_use_gpu_copy = pExaSrcPix->use_gpu_copy;

+	save_pitch = pSrcPix->devKind;

+

+	pExaSrcPix->use_gpu_copy = TRUE;

+	pSrcPix->devKind = pExaSrcPix->fb_pitch;

+

+	pDstPix->drawable.width = pSrcPix->drawable.width;

+	pDstPix->devKind = pSrcPix->devKind;

+	pDstPix->drawable.height = pSrcPix->drawable.height;

+	pDstPix->drawable.depth = pSrcPix->drawable.depth;

+	pDstPix->drawable.bitsPerPixel = pSrcPix->drawable.bitsPerPixel;

+

+	if (!pExaScr->info->PrepareCopy (pSrcPix, pDstPix, -1, -1, GXcopy, ~0)) {

+	    pExaSrcPix->use_gpu_copy = save_use_gpu_copy;

+	    pSrcPix->devKind = save_pitch;

+	    area = prev;

+	    continue;

+	}

+

+	pExaScr->info->Copy (pDstPix, 0, 0, 0, 0, pDstPix->drawable.width,

+			     pDstPix->drawable.height);

+	pExaScr->info->DoneCopy (pDstPix);

+	exaMarkSync (pScreen);

+

+	DBG_OFFSCREEN(("Before swap: prev=0x%08x-0x%08x-0x%08x area=0x%08x-0x%08x-0x%08x\n",

+		       prev->base_offset, prev->offset, prev->base_offset + prev->size,

+		       area->base_offset, area->offset, area->base_offset + area->size));

+

+	/* Calculate swapped area offsets and sizes */

+	area->base_offset = prev->base_offset;

+	area->offset = area->base_offset;

+	prev->offset += pExaDstPix->fb_ptr - pExaSrcPix->fb_ptr;

+	assert(prev->offset >= pExaScr->info->offScreenBase &&

+	       prev->offset < pExaScr->info->memorySize);

+	prev->base_offset = prev->offset;

+	if (area->next)

+	    prev->size = area->next->base_offset - prev->base_offset;

+	else

+	    prev->size = pExaScr->info->memorySize - prev->base_offset;

+	area->size = prev->base_offset - area->base_offset;

+

+	DBG_OFFSCREEN(("After swap: area=0x%08x-0x%08x-0x%08x prev=0x%08x-0x%08x-0x%08x\n",

+		       area->base_offset, area->offset, area->base_offset + area->size,

+		       prev->base_offset, prev->offset, prev->base_offset + prev->size));

+

+	/* Swap areas in list */

+	if (area->next)

+	    area->next->prev = prev;

+	else

+	    pExaScr->info->offScreenAreas->prev = prev;

+	if (prev->prev->next)

+	    prev->prev->next = area;

+	else

+	    pExaScr->info->offScreenAreas = area;

+	prev->next = area->next;

+	area->next = prev;

+	area->prev = prev->prev;

+	prev->prev = area;

+	if (!area->prev->next)

+	    pExaScr->info->offScreenAreas = area;

+

+#if DEBUG_OFFSCREEN

+	if (prev->prev == prev || prev->next == prev)

+	    ErrorF("Whoops, prev points to itself!\n");

+

+	if (area->prev == area || area->next == area)

+	    ErrorF("Whoops, area points to itself!\n");

+#endif

+

+	pExaSrcPix->fb_ptr = pExaDstPix->fb_ptr;

+	pExaSrcPix->use_gpu_copy = save_use_gpu_copy;

+	pSrcPix->devKind = save_pitch;

+    }

+

+    pDstPix->drawable.width = 0;

+    pDstPix->drawable.height = 0;

+    pDstPix->drawable.depth = 0;

+    pDstPix->drawable.bitsPerPixel = 0;

+

+    (*pScreen->DestroyPixmap) (pDstPix);

+

+    if (area->state == ExaOffscreenAvail && area->size > largest_size)

+	return area;

+

+    return largest_available;

+}

+

+/**

+ * exaOffscreenInit initializes the offscreen memory manager.

+ *

+ * @param pScreen current screen

+ *

+ * exaOffscreenInit is called by exaDriverInit to set up the memory manager for

+ * the screen, if any offscreen memory is available.

+ */

+Bool

+exaOffscreenInit (ScreenPtr pScreen)

+{

+    ExaScreenPriv (pScreen);

+    ExaOffscreenArea *area;

+

+    /* Allocate a big free area */

+    area = malloc(sizeof (ExaOffscreenArea));

+

+    if (!area)

+	return FALSE;

+

+    area->state = ExaOffscreenAvail;

+    area->base_offset = pExaScr->info->offScreenBase;

+    area->offset = area->base_offset;

+    area->align = 0;

+    area->size = pExaScr->info->memorySize - area->base_offset;

+    area->save = NULL;

+    area->next = NULL;

+    area->prev = area;

+    area->last_use = 0;

+    area->eviction_cost = 0;

+

+    /* Add it to the free areas */

+    pExaScr->info->offScreenAreas = area;

+    pExaScr->offScreenCounter = 1;

+    pExaScr->numOffscreenAvailable = 1;

+

+    ExaOffscreenValidate (pScreen);

+

+    return TRUE;

+}

+

+void

+ExaOffscreenFini (ScreenPtr pScreen)

+{

+    ExaScreenPriv (pScreen);

+    ExaOffscreenArea *area;

+

+    /* just free all of the area records */

+    while ((area = pExaScr->info->offScreenAreas))

+    {

+	pExaScr->info->offScreenAreas = area->next;

+	free(area);

+    }

+}