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-rw-r--r--xorg-server/exa/exa_migration.c701
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diff --git a/xorg-server/exa/exa_migration.c b/xorg-server/exa/exa_migration.c
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+++ b/xorg-server/exa/exa_migration.c
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+/*
+ * Copyright © 2006 Intel Corporation
+ *
+ * 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 (including the next
+ * paragraph) 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 AUTHORS OR COPYRIGHT HOLDERS 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.
+ *
+ * Authors:
+ * Eric Anholt <eric@anholt.net>
+ * Michel Dänzer <michel@tungstengraphics.com>
+ *
+ */
+
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
+#include <string.h>
+
+#include "exa_priv.h"
+#include <X11/fonts/fontstruct.h>
+#include "dixfontstr.h"
+#include "exa.h"
+#include "cw.h"
+
+#if DEBUG_MIGRATE
+#define DBG_MIGRATE(a) ErrorF a
+#else
+#define DBG_MIGRATE(a)
+#endif
+
+/**
+ * Returns TRUE if the pixmap is not movable. This is the case where it's a
+ * fake pixmap for the frontbuffer (no pixmap private) or it's a scratch
+ * pixmap created by some other X Server internals (the score says it's
+ * pinned).
+ */
+static Bool
+exaPixmapIsPinned (PixmapPtr pPix)
+{
+ ExaPixmapPriv (pPix);
+
+ return pExaPixmap == NULL || pExaPixmap->score == EXA_PIXMAP_SCORE_PINNED;
+}
+
+/**
+ * The fallback path for UTS/DFS failing is to just memcpy. exaCopyDirtyToSys
+ * and exaCopyDirtyToFb both needed to do this loop.
+ */
+static void
+exaMemcpyBox (PixmapPtr pPixmap, BoxPtr pbox, CARD8 *src, int src_pitch,
+ CARD8 *dst, int dst_pitch)
+ {
+ int i, cpp = pPixmap->drawable.bitsPerPixel / 8;
+ int bytes = (pbox->x2 - pbox->x1) * cpp;
+
+ src += pbox->y1 * src_pitch + pbox->x1 * cpp;
+ dst += pbox->y1 * dst_pitch + pbox->x1 * cpp;
+
+ for (i = pbox->y2 - pbox->y1; i; i--) {
+ memcpy (dst, src, bytes);
+ src += src_pitch;
+ dst += dst_pitch;
+ }
+}
+
+/**
+ * Returns TRUE if the pixmap is dirty (has been modified in its current
+ * location compared to the other), or lacks a private for tracking
+ * dirtiness.
+ */
+static Bool
+exaPixmapIsDirty (PixmapPtr pPix)
+{
+ ExaPixmapPriv (pPix);
+
+ return pExaPixmap == NULL ||
+ REGION_NOTEMPTY (pScreen, DamageRegion(pExaPixmap->pDamage)) ||
+ !REGION_EQUAL(pScreen, &pExaPixmap->validSys, &pExaPixmap->validFB);
+}
+
+/**
+ * Returns TRUE if the pixmap is either pinned in FB, or has a sufficient score
+ * to be considered "should be in framebuffer". That's just anything that has
+ * had more acceleration than fallbacks, or has no score yet.
+ *
+ * Only valid if using a migration scheme that tracks score.
+ */
+static Bool
+exaPixmapShouldBeInFB (PixmapPtr pPix)
+{
+ ExaPixmapPriv (pPix);
+
+ if (exaPixmapIsPinned (pPix))
+ return TRUE;
+
+ return pExaPixmap->score >= 0;
+}
+
+/**
+ * If the pixmap is currently dirty, this copies at least the dirty area from
+ * FB to system or vice versa. Both areas must be allocated.
+ */
+static void
+exaCopyDirty(ExaMigrationPtr migrate, RegionPtr pValidDst, RegionPtr pValidSrc,
+ Bool (*transfer) (PixmapPtr pPix, int x, int y, int w, int h,
+ char *sys, int sys_pitch), CARD8 *fallback_src,
+ CARD8 *fallback_dst, int fallback_srcpitch, int fallback_dstpitch,
+ int fallback_index, void (*sync) (ScreenPtr pScreen))
+{
+ PixmapPtr pPixmap = migrate->pPix;
+ ExaPixmapPriv (pPixmap);
+ RegionPtr damage = DamageRegion (pExaPixmap->pDamage);
+ RegionRec CopyReg;
+ Bool save_offscreen;
+ int save_pitch;
+ BoxPtr pBox;
+ int nbox;
+ Bool access_prepared = FALSE;
+ Bool need_sync = FALSE;
+
+ /* Damaged bits are valid in current copy but invalid in other one */
+ if (exaPixmapIsOffscreen(pPixmap)) {
+ REGION_UNION(pScreen, &pExaPixmap->validFB, &pExaPixmap->validFB,
+ damage);
+ REGION_SUBTRACT(pScreen, &pExaPixmap->validSys, &pExaPixmap->validSys,
+ damage);
+ } else {
+ REGION_UNION(pScreen, &pExaPixmap->validSys, &pExaPixmap->validSys,
+ damage);
+ REGION_SUBTRACT(pScreen, &pExaPixmap->validFB, &pExaPixmap->validFB,
+ damage);
+ }
+
+ REGION_EMPTY(pScreen, damage);
+
+ /* Copy bits valid in source but not in destination */
+ REGION_NULL(pScreen, &CopyReg);
+ REGION_SUBTRACT(pScreen, &CopyReg, pValidSrc, pValidDst);
+
+ if (migrate->as_dst) {
+ ExaScreenPriv (pPixmap->drawable.pScreen);
+
+ /* XXX: The pending damage region will be marked as damaged after the
+ * operation, so it should serve as an upper bound for the region that
+ * needs to be synchronized for the operation. Unfortunately, this
+ * causes corruption in some cases, e.g. when starting compiz. See
+ * https://bugs.freedesktop.org/show_bug.cgi?id=12916 .
+ */
+ if (pExaScr->optimize_migration) {
+ RegionPtr pending_damage = DamagePendingRegion(pExaPixmap->pDamage);
+
+ if (REGION_NIL(pending_damage)) {
+ static Bool firsttime = TRUE;
+
+ if (firsttime) {
+ ErrorF("%s: Pending damage region empty!\n", __func__);
+ firsttime = FALSE;
+ }
+ }
+
+ REGION_INTERSECT(pScreen, &CopyReg, &CopyReg, pending_damage);
+ }
+
+ /* The caller may provide a region to be subtracted from the calculated
+ * dirty region. This is to avoid migration of bits that don't
+ * contribute to the result of the operation.
+ */
+ if (migrate->pReg)
+ REGION_SUBTRACT(pScreen, &CopyReg, &CopyReg, migrate->pReg);
+ } else {
+ /* The caller may restrict the region to be migrated for source pixmaps
+ * to what's relevant for the operation.
+ */
+ if (migrate->pReg)
+ REGION_INTERSECT(pScreen, &CopyReg, &CopyReg, migrate->pReg);
+ }
+
+ pBox = REGION_RECTS(&CopyReg);
+ nbox = REGION_NUM_RECTS(&CopyReg);
+
+ save_offscreen = pExaPixmap->offscreen;
+ save_pitch = pPixmap->devKind;
+ pExaPixmap->offscreen = TRUE;
+ pPixmap->devKind = pExaPixmap->fb_pitch;
+
+ while (nbox--) {
+ pBox->x1 = max(pBox->x1, 0);
+ pBox->y1 = max(pBox->y1, 0);
+ pBox->x2 = min(pBox->x2, pPixmap->drawable.width);
+ pBox->y2 = min(pBox->y2, pPixmap->drawable.height);
+
+ if (pBox->x1 >= pBox->x2 || pBox->y1 >= pBox->y2)
+ continue;
+
+ if (!transfer || !transfer (pPixmap,
+ pBox->x1, pBox->y1,
+ pBox->x2 - pBox->x1,
+ pBox->y2 - pBox->y1,
+ pExaPixmap->sys_ptr
+ + pBox->y1 * pExaPixmap->sys_pitch
+ + pBox->x1 * pPixmap->drawable.bitsPerPixel / 8,
+ pExaPixmap->sys_pitch))
+ {
+ if (!access_prepared) {
+ ExaDoPrepareAccess(&pPixmap->drawable, fallback_index);
+ access_prepared = TRUE;
+ }
+ exaMemcpyBox (pPixmap, pBox,
+ fallback_src, fallback_srcpitch,
+ fallback_dst, fallback_dstpitch);
+ } else
+ need_sync = TRUE;
+
+ pBox++;
+ }
+
+ if (access_prepared)
+ exaFinishAccess(&pPixmap->drawable, fallback_index);
+ else if (need_sync)
+ sync (pPixmap->drawable.pScreen);
+
+ pExaPixmap->offscreen = save_offscreen;
+ pPixmap->devKind = save_pitch;
+
+ /* The copied bits are now valid in destination */
+ REGION_UNION(pScreen, pValidDst, pValidDst, &CopyReg);
+
+ REGION_UNINIT(pScreen, &CopyReg);
+}
+
+/**
+ * If the pixmap is currently dirty, this copies at least the dirty area from
+ * the framebuffer memory copy to the system memory copy. Both areas must be
+ * allocated.
+ */
+static void
+exaCopyDirtyToSys (ExaMigrationPtr migrate)
+{
+ PixmapPtr pPixmap = migrate->pPix;
+ ExaScreenPriv (pPixmap->drawable.pScreen);
+ ExaPixmapPriv (pPixmap);
+
+ exaCopyDirty(migrate, &pExaPixmap->validSys, &pExaPixmap->validFB,
+ pExaScr->info->DownloadFromScreen, pExaPixmap->fb_ptr,
+ pExaPixmap->sys_ptr, pExaPixmap->fb_pitch,
+ pExaPixmap->sys_pitch, EXA_PREPARE_SRC, exaWaitSync);
+}
+
+/**
+ * If the pixmap is currently dirty, this copies at least the dirty area from
+ * the system memory copy to the framebuffer memory copy. Both areas must be
+ * allocated.
+ */
+static void
+exaCopyDirtyToFb (ExaMigrationPtr migrate)
+{
+ PixmapPtr pPixmap = migrate->pPix;
+ ExaScreenPriv (pPixmap->drawable.pScreen);
+ ExaPixmapPriv (pPixmap);
+
+ exaCopyDirty(migrate, &pExaPixmap->validFB, &pExaPixmap->validSys,
+ pExaScr->info->UploadToScreen, pExaPixmap->sys_ptr,
+ pExaPixmap->fb_ptr, pExaPixmap->sys_pitch,
+ pExaPixmap->fb_pitch, EXA_PREPARE_DEST, exaMarkSync);
+}
+
+/**
+ * Allocates a framebuffer copy of the pixmap if necessary, and then copies
+ * any necessary pixmap data into the framebuffer copy and points the pixmap at
+ * it.
+ *
+ * Note that when first allocated, a pixmap will have FALSE dirty flag.
+ * This is intentional because pixmap data starts out undefined. So if we move
+ * it in due to the first operation against it being accelerated, it will have
+ * undefined framebuffer contents that we didn't have to upload. If we do
+ * moveouts (and moveins) after the first movein, then we will only have to copy
+ * back and forth if the pixmap was written to after the last synchronization of
+ * the two copies. Then, at exaPixmapSave (when the framebuffer copy goes away)
+ * we mark the pixmap dirty, so that the next exaMoveInPixmap will actually move
+ * all the data, since it's almost surely all valid now.
+ */
+static void
+exaDoMoveInPixmap (ExaMigrationPtr migrate)
+{
+ PixmapPtr pPixmap = migrate->pPix;
+ ScreenPtr pScreen = pPixmap->drawable.pScreen;
+ ExaScreenPriv (pScreen);
+ ExaPixmapPriv (pPixmap);
+
+ /* If we're VT-switched away, no touching card memory allowed. */
+ if (pExaScr->swappedOut)
+ return;
+
+ /* If we're not allowed to move, then fail. */
+ if (exaPixmapIsPinned(pPixmap))
+ return;
+
+ /* Don't migrate in pixmaps which are less than 8bpp. This avoids a lot of
+ * fragility in EXA, and <8bpp is probably not used enough any more to care
+ * (at least, not in acceleratd paths).
+ */
+ if (pPixmap->drawable.bitsPerPixel < 8)
+ return;
+
+ if (pExaPixmap->accel_blocked)
+ return;
+
+ if (pExaPixmap->area == NULL) {
+ pExaPixmap->area =
+ exaOffscreenAlloc (pScreen, pExaPixmap->fb_size,
+ pExaScr->info->pixmapOffsetAlign, FALSE,
+ exaPixmapSave, (pointer) pPixmap);
+ if (pExaPixmap->area == NULL)
+ return;
+
+ pExaPixmap->fb_ptr = (CARD8 *) pExaScr->info->memoryBase +
+ pExaPixmap->area->offset;
+ }
+
+ exaCopyDirtyToFb (migrate);
+
+ if (exaPixmapIsOffscreen(pPixmap))
+ return;
+
+ DBG_MIGRATE (("-> %p (0x%x) (%dx%d) (%c)\n", pPixmap,
+ (ExaGetPixmapPriv(pPixmap)->area ?
+ ExaGetPixmapPriv(pPixmap)->area->offset : 0),
+ pPixmap->drawable.width,
+ pPixmap->drawable.height,
+ exaPixmapIsDirty(pPixmap) ? 'd' : 'c'));
+
+ pExaPixmap->offscreen = TRUE;
+
+ pPixmap->devKind = pExaPixmap->fb_pitch;
+ pPixmap->drawable.serialNumber = NEXT_SERIAL_NUMBER;
+}
+
+void
+exaMoveInPixmap (PixmapPtr pPixmap)
+{
+ static ExaMigrationRec migrate = { .as_dst = FALSE, .as_src = TRUE,
+ .pReg = NULL };
+
+ migrate.pPix = pPixmap;
+ exaDoMoveInPixmap (&migrate);
+}
+
+/**
+ * Switches the current active location of the pixmap to system memory, copying
+ * updated data out if necessary.
+ */
+static void
+exaDoMoveOutPixmap (ExaMigrationPtr migrate)
+{
+ PixmapPtr pPixmap = migrate->pPix;
+ ExaPixmapPriv (pPixmap);
+
+ if (!pExaPixmap->area || exaPixmapIsPinned(pPixmap))
+ return;
+
+ exaCopyDirtyToSys (migrate);
+
+ if (exaPixmapIsOffscreen(pPixmap)) {
+
+ DBG_MIGRATE (("<- %p (%p) (%dx%d) (%c)\n", pPixmap,
+ (void*)(ExaGetPixmapPriv(pPixmap)->area ?
+ ExaGetPixmapPriv(pPixmap)->area->offset : 0),
+ pPixmap->drawable.width,
+ pPixmap->drawable.height,
+ exaPixmapIsDirty(pPixmap) ? 'd' : 'c'));
+
+ pExaPixmap->offscreen = FALSE;
+
+ pPixmap->devKind = pExaPixmap->sys_pitch;
+ pPixmap->drawable.serialNumber = NEXT_SERIAL_NUMBER;
+ }
+}
+
+void
+exaMoveOutPixmap (PixmapPtr pPixmap)
+{
+ static ExaMigrationRec migrate = { .as_dst = FALSE, .as_src = TRUE,
+ .pReg = NULL };
+
+ migrate.pPix = pPixmap;
+ exaDoMoveOutPixmap (&migrate);
+}
+
+
+/**
+ * Copies out important pixmap data and removes references to framebuffer area.
+ * Called when the memory manager decides it's time to kick the pixmap out of
+ * framebuffer entirely.
+ */
+void
+exaPixmapSave (ScreenPtr pScreen, ExaOffscreenArea *area)
+{
+ PixmapPtr pPixmap = area->privData;
+ ExaPixmapPriv(pPixmap);
+
+ exaMoveOutPixmap(pPixmap);
+
+ pExaPixmap->fb_ptr = NULL;
+ pExaPixmap->area = NULL;
+
+ /* Mark all FB bits as invalid, so all valid system bits get copied to FB
+ * next time */
+ REGION_EMPTY(pPixmap->drawable.pScreen, &pExaPixmap->validFB);
+}
+
+/**
+ * For the "greedy" migration scheme, pushes the pixmap toward being located in
+ * framebuffer memory.
+ */
+static void
+exaMigrateTowardFb (ExaMigrationPtr migrate)
+{
+ PixmapPtr pPixmap = migrate->pPix;
+ ExaPixmapPriv (pPixmap);
+
+ if (pExaPixmap == NULL) {
+ DBG_MIGRATE(("UseScreen: ignoring exa-uncontrolled pixmap %p (%s)\n",
+ (pointer)pPixmap,
+ exaPixmapIsOffscreen(pPixmap) ? "s" : "m"));
+ return;
+ }
+
+ if (pExaPixmap->score == EXA_PIXMAP_SCORE_PINNED) {
+ DBG_MIGRATE(("UseScreen: not migrating pinned pixmap %p\n",
+ (pointer)pPixmap));
+ return;
+ }
+
+ DBG_MIGRATE(("UseScreen %p score %d\n",
+ (pointer)pPixmap, pExaPixmap->score));
+
+ if (pExaPixmap->score == EXA_PIXMAP_SCORE_INIT) {
+ exaDoMoveInPixmap(migrate);
+ pExaPixmap->score = 0;
+ }
+
+ if (pExaPixmap->score < EXA_PIXMAP_SCORE_MAX)
+ pExaPixmap->score++;
+
+ if (pExaPixmap->score >= EXA_PIXMAP_SCORE_MOVE_IN &&
+ !exaPixmapIsOffscreen(pPixmap))
+ {
+ exaDoMoveInPixmap(migrate);
+ }
+
+ ExaOffscreenMarkUsed (pPixmap);
+}
+
+/**
+ * For the "greedy" migration scheme, pushes the pixmap toward being located in
+ * system memory.
+ */
+static void
+exaMigrateTowardSys (ExaMigrationPtr migrate)
+{
+ PixmapPtr pPixmap = migrate->pPix;
+ ExaPixmapPriv (pPixmap);
+
+ if (pExaPixmap == NULL) {
+ DBG_MIGRATE(("UseMem: ignoring exa-uncontrolled pixmap %p (%s)\n",
+ (pointer)pPixmap,
+ exaPixmapIsOffscreen(pPixmap) ? "s" : "m"));
+ return;
+ }
+
+ DBG_MIGRATE(("UseMem: %p score %d\n", (pointer)pPixmap, pExaPixmap->score));
+
+ if (pExaPixmap->score == EXA_PIXMAP_SCORE_PINNED)
+ return;
+
+ if (pExaPixmap->score == EXA_PIXMAP_SCORE_INIT)
+ pExaPixmap->score = 0;
+
+ if (pExaPixmap->score > EXA_PIXMAP_SCORE_MIN)
+ pExaPixmap->score--;
+
+ if (pExaPixmap->score <= EXA_PIXMAP_SCORE_MOVE_OUT && pExaPixmap->area)
+ exaDoMoveOutPixmap(migrate);
+}
+
+/**
+ * If the pixmap has both a framebuffer and system memory copy, this function
+ * asserts that both of them are the same.
+ */
+static Bool
+exaAssertNotDirty (PixmapPtr pPixmap)
+{
+ ExaPixmapPriv (pPixmap);
+ CARD8 *dst, *src;
+ RegionRec ValidReg;
+ int dst_pitch, src_pitch, cpp, y, nbox;
+ BoxPtr pBox;
+ Bool ret = TRUE;
+
+ if (exaPixmapIsPinned(pPixmap) || pExaPixmap->area == NULL)
+ return ret;
+
+ REGION_NULL(pScreen, &ValidReg);
+ REGION_INTERSECT(pScreen, &ValidReg, &pExaPixmap->validFB,
+ &pExaPixmap->validSys);
+ nbox = REGION_NUM_RECTS(&ValidReg);
+
+ if (!nbox)
+ goto out;
+
+ pBox = REGION_RECTS(&ValidReg);
+
+ dst_pitch = pExaPixmap->sys_pitch;
+ src_pitch = pExaPixmap->fb_pitch;
+ cpp = pPixmap->drawable.bitsPerPixel / 8;
+
+ ExaDoPrepareAccess(&pPixmap->drawable, EXA_PREPARE_SRC);
+ while (nbox--) {
+ int rowbytes;
+
+ pBox->x1 = max(pBox->x1, 0);
+ pBox->y1 = max(pBox->y1, 0);
+ pBox->x2 = min(pBox->x2, pPixmap->drawable.width);
+ pBox->y2 = min(pBox->y2, pPixmap->drawable.height);
+
+ if (pBox->x1 >= pBox->x2 || pBox->y1 >= pBox->y2)
+ continue;
+
+ rowbytes = (pBox->x2 - pBox->x1) * cpp;
+ src = pExaPixmap->fb_ptr + pBox->y1 * src_pitch + pBox->x1 * cpp;
+ dst = pExaPixmap->sys_ptr + pBox->y1 * dst_pitch + pBox->x1 * cpp;
+
+ for (y = pBox->y1; y < pBox->y2;
+ y++, src += src_pitch, dst += dst_pitch) {
+ if (memcmp(dst, src, rowbytes) != 0) {
+ ret = FALSE;
+ exaPixmapDirty(pPixmap, pBox->x1, pBox->y1, pBox->x2,
+ pBox->y2);
+ break;
+ }
+ }
+ }
+ exaFinishAccess(&pPixmap->drawable, EXA_PREPARE_SRC);
+
+out:
+ REGION_UNINIT(pScreen, &ValidReg);
+ return ret;
+}
+
+/**
+ * Performs migration of the pixmaps according to the operation information
+ * provided in pixmaps and can_accel and the migration scheme chosen in the
+ * config file.
+ */
+void
+exaDoMigration (ExaMigrationPtr pixmaps, int npixmaps, Bool can_accel)
+{
+ ScreenPtr pScreen = pixmaps[0].pPix->drawable.pScreen;
+ ExaScreenPriv(pScreen);
+ int i, j;
+
+ if (pExaScr->info->flags & EXA_HANDLES_PIXMAPS)
+ return;
+
+ /* If this debugging flag is set, check each pixmap for whether it is marked
+ * as clean, and if so, actually check if that's the case. This should help
+ * catch issues with failing to mark a drawable as dirty. While it will
+ * catch them late (after the operation happened), it at least explains what
+ * went wrong, and instrumenting the code to find what operation happened
+ * to the pixmap last shouldn't be hard.
+ */
+ if (pExaScr->checkDirtyCorrectness) {
+ for (i = 0; i < npixmaps; i++) {
+ if (!exaPixmapIsDirty (pixmaps[i].pPix) &&
+ !exaAssertNotDirty (pixmaps[i].pPix))
+ ErrorF("%s: Pixmap %d dirty but not marked as such!\n", __func__, i);
+ }
+ }
+ /* If anything is pinned in system memory, we won't be able to
+ * accelerate.
+ */
+ for (i = 0; i < npixmaps; i++) {
+ if (exaPixmapIsPinned (pixmaps[i].pPix) &&
+ !exaPixmapIsOffscreen (pixmaps[i].pPix))
+ {
+ EXA_FALLBACK(("Pixmap %p (%dx%d) pinned in sys\n", pixmaps[i].pPix,
+ pixmaps[i].pPix->drawable.width,
+ pixmaps[i].pPix->drawable.height));
+ can_accel = FALSE;
+ break;
+ }
+ }
+
+ if (pExaScr->migration == ExaMigrationSmart) {
+ /* If we've got something as a destination that we shouldn't cause to
+ * become newly dirtied, take the unaccelerated route.
+ */
+ for (i = 0; i < npixmaps; i++) {
+ if (pixmaps[i].as_dst && !exaPixmapShouldBeInFB (pixmaps[i].pPix) &&
+ !exaPixmapIsDirty (pixmaps[i].pPix))
+ {
+ for (i = 0; i < npixmaps; i++) {
+ if (!exaPixmapIsDirty (pixmaps[i].pPix))
+ exaDoMoveOutPixmap (pixmaps + i);
+ }
+ return;
+ }
+ }
+
+ /* If we aren't going to accelerate, then we migrate everybody toward
+ * system memory, and kick out if it's free.
+ */
+ if (!can_accel) {
+ for (i = 0; i < npixmaps; i++) {
+ exaMigrateTowardSys (pixmaps + i);
+ if (!exaPixmapIsDirty (pixmaps[i].pPix))
+ exaDoMoveOutPixmap (pixmaps + i);
+ }
+ return;
+ }
+
+ /* Finally, the acceleration path. Move them all in. */
+ for (i = 0; i < npixmaps; i++) {
+ exaMigrateTowardFb(pixmaps + i);
+ exaDoMoveInPixmap(pixmaps + i);
+ }
+ } else if (pExaScr->migration == ExaMigrationGreedy) {
+ /* If we can't accelerate, either because the driver can't or because one of
+ * the pixmaps is pinned in system memory, then we migrate everybody toward
+ * system memory.
+ *
+ * We also migrate toward system if all pixmaps involved are currently in
+ * system memory -- this can mitigate thrashing when there are significantly
+ * more pixmaps active than would fit in memory.
+ *
+ * If not, then we migrate toward FB so that hopefully acceleration can
+ * happen.
+ */
+ if (!can_accel) {
+ for (i = 0; i < npixmaps; i++)
+ exaMigrateTowardSys (pixmaps + i);
+ return;
+ }
+
+ for (i = 0; i < npixmaps; i++) {
+ if (exaPixmapIsOffscreen(pixmaps[i].pPix)) {
+ /* Found one in FB, so move all to FB. */
+ for (j = 0; j < npixmaps; j++)
+ exaMigrateTowardFb(pixmaps + i);
+ return;
+ }
+ }
+
+ /* Nobody's in FB, so move all away from FB. */
+ for (i = 0; i < npixmaps; i++)
+ exaMigrateTowardSys(pixmaps + i);
+ } else if (pExaScr->migration == ExaMigrationAlways) {
+ /* Always move the pixmaps out if we can't accelerate. If we can
+ * accelerate, try to move them all in. If that fails, then move them
+ * back out.
+ */
+ if (!can_accel) {
+ for (i = 0; i < npixmaps; i++)
+ exaDoMoveOutPixmap(pixmaps + i);
+ return;
+ }
+
+ /* Now, try to move them all into FB */
+ for (i = 0; i < npixmaps; i++) {
+ exaDoMoveInPixmap(pixmaps + i);
+ }
+
+ /* If we couldn't fit everything in, abort */
+ for (i = 0; i < npixmaps; i++) {
+ if (!exaPixmapIsOffscreen(pixmaps[i].pPix)) {
+ return;
+ }
+ }
+
+ /* Yay, everything's offscreen, mark memory as used */
+ for (i = 0; i < npixmaps; i++) {
+ ExaOffscreenMarkUsed (pixmaps[i].pPix);
+ }
+ }
+}