xf86-video-intel: src/sna/kgem.h src/sna/sna_display.c src/sna/sna_dri2.c
Chris Wilson
ickle at kemper.freedesktop.org
Wed Feb 24 18:05:21 UTC 2016
src/sna/kgem.h | 1
src/sna/sna_display.c | 15 ++-
src/sna/sna_dri2.c | 200 +++++++++++++++++++++++++++++++-------------------
3 files changed, 138 insertions(+), 78 deletions(-)
New commits:
commit d1672806a5222f00dcc2eb24ccddd03f727f71bc
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date: Wed Feb 24 10:33:22 2016 +0000
sna/dri2: Add active-scanout tracking to single CRTC flips
When we do a partial flip (one CRTC of many) we install a fake
frontbuffer for the window. This needs to be included in the
active-scanout tracking like a normal frontbuffer to avoid being
recycled too early.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
diff --git a/src/sna/kgem.h b/src/sna/kgem.h
index 8bea755..0a941e0 100644
--- a/src/sna/kgem.h
+++ b/src/sna/kgem.h
@@ -404,6 +404,7 @@ void _kgem_bo_destroy(struct kgem *kgem, struct kgem_bo *bo);
static inline void kgem_bo_destroy(struct kgem *kgem, struct kgem_bo *bo)
{
assert(bo->refcnt);
+ assert(bo->refcnt > bo->active_scanout);
if (--bo->refcnt == 0)
_kgem_bo_destroy(kgem, bo);
}
diff --git a/src/sna/sna_display.c b/src/sna/sna_display.c
index 98fb8af..78338e6 100644
--- a/src/sna/sna_display.c
+++ b/src/sna/sna_display.c
@@ -1640,6 +1640,7 @@ static bool wait_for_shadow(struct sna *sna,
RegionSubtract(&sna->mode.shadow_region, &sna->mode.shadow_region, ®ion);
}
+ crtc->client_bo->active_scanout--;
kgem_bo_destroy(&sna->kgem, crtc->client_bo);
crtc->client_bo = NULL;
list_del(&crtc->shadow_link);
@@ -1865,7 +1866,8 @@ static void sna_crtc_disable_override(struct sna *sna, struct sna_crtc *crtc)
if (crtc->client_bo == NULL)
return;
- assert(crtc->client_bo->refcnt > crtc->client_bo->active_scanout);
+ assert(crtc->client_bo->refcnt >= crtc->client_bo->active_scanout);
+ crtc->client_bo->active_scanout--;
if (!crtc->transform) {
DrawableRec tmp;
@@ -4366,6 +4368,7 @@ gather_encoders(struct sna *sna, uint32_t id, int count,
DBG(("%s(%d): expected count=%d\n", __FUNCTION__, id, count));
VG_CLEAR(compat_conn);
+ VG_CLEAR(enc);
memset(out, 0, sizeof(*out));
do {
@@ -4390,6 +4393,7 @@ gather_encoders(struct sna *sna, uint32_t id, int count,
compat_conn.conn.count_encoders = count = 0;
}
+ VG(VALGRIND_MAKE_MEM_DEFINED(ids, sizeof(uint32_t)*compat_conn.conn.count_encoders));
if (count == compat_conn.conn.count_encoders)
break;
@@ -8391,12 +8395,14 @@ void sna_shadow_set_crtc(struct sna *sna,
if (sna_crtc->client_bo != bo) {
if (sna_crtc->client_bo) {
- assert(sna_crtc->client_bo->refcnt > sna_crtc->client_bo->active_scanout);
+ assert(sna_crtc->client_bo->refcnt >= sna_crtc->client_bo->active_scanout);
+ sna_crtc->client_bo->active_scanout--;
kgem_bo_destroy(&sna->kgem, sna_crtc->client_bo);
}
sna_crtc->client_bo = kgem_bo_reference(bo);
- assert(sna_crtc->client_bo->refcnt > sna_crtc->client_bo->active_scanout);
+ sna_crtc->client_bo->active_scanout++;
+ assert(sna_crtc->client_bo->refcnt >= sna_crtc->client_bo->active_scanout);
sna_crtc_damage(crtc);
}
@@ -8451,7 +8457,8 @@ void sna_shadow_unset_crtc(struct sna *sna,
if (sna_crtc->client_bo == NULL)
return;
- assert(sna_crtc->client_bo->refcnt > sna_crtc->client_bo->active_scanout);
+ assert(sna_crtc->client_bo->refcnt >= sna_crtc->client_bo->active_scanout);
+ sna_crtc->client_bo->active_scanout--;
kgem_bo_destroy(&sna->kgem, sna_crtc->client_bo);
sna_crtc->client_bo = NULL;
list_del(&sna_crtc->shadow_link);
diff --git a/src/sna/sna_dri2.c b/src/sna/sna_dri2.c
index 2fcda87..2ed698d 100644
--- a/src/sna/sna_dri2.c
+++ b/src/sna/sna_dri2.c
@@ -171,6 +171,7 @@ inline static void
__sna_dri2_copy_event(struct sna_dri2_event *info, unsigned flags)
{
DBG(("%s: flags = %x\n", __FUNCTION__, flags));
+ assert(info->front != info->back);
info->bo = __sna_dri2_copy_region(info->sna, info->draw, NULL,
info->back, info->front,
flags);
@@ -282,12 +283,16 @@ sna_dri2_get_back(struct sna *sna,
__FUNCTION__, c->bo ? c->bo->handle : 0, c->bo ? c->bo->active_scanout : -1));
assert(c->bo);
if (c->bo->active_scanout == 0) {
+ _list_del(&c->link);
+ if (c->bo == NULL) {
+ free(c);
+ goto out;
+ }
bo = c->bo;
name = c->name;
flags = c->flags;
DBG(("%s: reuse cache handle=%d, name=%d, flags=%d\n", __FUNCTION__, bo->handle, name, flags));
c->bo = NULL;
- _list_del(&c->link);
break;
}
}
@@ -360,6 +365,7 @@ sna_dri2_get_back(struct sna *sna,
assert(back->pitch);
assert(back->name);
+out:
get_private(back)->stale = false;
}
@@ -368,11 +374,13 @@ dri2_chain(DrawablePtr d)
{
struct dri2_window *priv = dri2_window((WindowPtr)d);
assert(priv != NULL);
+ assert(priv->chain == NULL || priv->chain->chained);
return priv->chain;
}
inline static DRI2BufferPtr dri2_window_get_front(WindowPtr win)
{
struct dri2_window *priv = dri2_window(win);
+ assert(priv->front == NULL || get_private(priv->front)->bo->active_scanout);
return priv ? priv->front : NULL;
}
#else
@@ -627,11 +635,13 @@ sna_dri2_create_buffer(DrawablePtr draw,
private->bo->handle, buffer->name,
private->bo->active_scanout));
+ assert(buffer->attachment == DRI2BufferFrontLeft);
assert(private->pixmap == pixmap);
assert(sna_pixmap(pixmap)->flush);
assert(sna_pixmap(pixmap)->pinned & PIN_DRI2);
assert(kgem_bo_flink(&sna->kgem, private->bo) == buffer->name);
assert(private->bo->pitch == buffer->pitch);
+ assert(private->bo->active_scanout);
private->refcnt++;
return buffer;
@@ -864,9 +874,10 @@ static void _sna_dri2_destroy_buffer(struct sna *sna,
if (buffer == NULL)
return;
- DBG(("%s: %p [handle=%d] -- refcnt=%d, pixmap=%ld\n",
+ DBG(("%s: %p [handle=%d] -- refcnt=%d, pixmap=%ld, proxy?=%d\n",
__FUNCTION__, buffer, private->bo->handle, private->refcnt,
- private->pixmap ? private->pixmap->drawable.serialNumber : 0));
+ private->pixmap ? private->pixmap->drawable.serialNumber : 0,
+ private->proxy != NULL));
assert(private->refcnt > 0);
if (--private->refcnt)
return;
@@ -875,6 +886,9 @@ static void _sna_dri2_destroy_buffer(struct sna *sna,
if (private->proxy) {
DBG(("%s: destroying proxy\n", __FUNCTION__));
+ assert(private->bo->active_scanout > 0);
+ private->bo->active_scanout--;
+
_sna_dri2_destroy_buffer(sna, draw, private->proxy);
private->pixmap = NULL;
}
@@ -889,6 +903,8 @@ static void _sna_dri2_destroy_buffer(struct sna *sna,
assert(priv->pinned & PIN_DRI2);
assert(priv->flush);
+ DBG(("%s: removing active_scanout=%d from pixmap handle=%d\n",
+ __FUNCTION__, priv->gpu_bo->active_scanout, priv->gpu_bo->handle));
assert(priv->gpu_bo->active_scanout > 0);
priv->gpu_bo->active_scanout--;
@@ -928,6 +944,7 @@ static void sna_dri2_destroy_buffer(DrawablePtr draw, DRI2Buffer2Ptr buffer)
static DRI2BufferPtr sna_dri2_reference_buffer(DRI2BufferPtr buffer)
{
+ assert(get_private(buffer)->refcnt > 0);
get_private(buffer)->refcnt++;
return buffer;
}
@@ -1616,7 +1633,6 @@ sna_dri2_remove_event(struct sna_dri2_event *info)
{
WindowPtr win = (WindowPtr)info->draw;
struct dri2_window *priv;
- struct sna_dri2_event *chain;
assert(win->drawable.type == DRAWABLE_WINDOW);
DBG(("%s: remove[%p] from window %ld, active? %d\n",
@@ -1630,9 +1646,11 @@ sna_dri2_remove_event(struct sna_dri2_event *info)
info->chained = false;
if (priv->chain != info) {
- chain = priv->chain;
- while (chain->chain != info)
+ struct sna_dri2_event *chain = priv->chain;
+ while (chain->chain != info) {
+ assert(chain->chained);
chain = chain->chain;
+ }
assert(chain != info);
assert(info->chain != chain);
chain->chain = info->chain;
@@ -1669,6 +1687,7 @@ sna_dri2_event_free(struct sna_dri2_event *info)
if (info->chained)
sna_dri2_remove_event(info);
+ assert((info->front == NULL && info->back == NULL) || info->front != info->back);
_sna_dri2_destroy_buffer(info->sna, info->draw, info->front);
_sna_dri2_destroy_buffer(info->sna, info->draw, info->back);
@@ -1809,8 +1828,10 @@ void sna_dri2_decouple_window(WindowPtr win)
if (priv->front) {
struct sna *sna = to_sna_from_drawable(&win->drawable);
+
assert(priv->crtc);
sna_shadow_unset_crtc(sna, priv->crtc);
+
_sna_dri2_destroy_buffer(sna, NULL, priv->front);
priv->front = NULL;
}
@@ -1833,6 +1854,7 @@ void sna_dri2_destroy_window(WindowPtr win)
if (priv->front) {
assert(priv->crtc);
sna_shadow_unset_crtc(sna, priv->crtc);
+
_sna_dri2_destroy_buffer(sna, NULL, priv->front);
}
@@ -1947,6 +1969,7 @@ sna_dri2_flip(struct sna_dri2_event *info)
info->front->pitch = info->back->pitch;
get_private(info->front)->bo = bo;
bo->active_scanout++;
+ assert(bo->active_scanout <= bo->refcnt);
info->back->flags = tmp_flags;
info->back->name = tmp_name;
@@ -2338,6 +2361,7 @@ sna_dri2_xchg(DrawablePtr draw, DRI2BufferPtr front, DRI2BufferPtr back)
assert(front_bo->active_scanout > 0);
front_bo->active_scanout--;
back_bo->active_scanout++;
+ assert(back_bo->active_scanout <= back_bo->refcnt);
tmp = front->name;
front->name = back->name;
@@ -2364,8 +2388,6 @@ static void sna_dri2_xchg_crtc(struct sna *sna, DrawablePtr draw, xf86CrtcPtr cr
{
WindowPtr win = (WindowPtr)draw;
struct dri2_window *priv = dri2_window(win);
- DRI2Buffer2Ptr tmp;
- struct kgem_bo *bo;
DBG(("%s: exchange front=%d/%d and back=%d/%d, win id=%lu, pixmap=%ld %dx%d\n",
__FUNCTION__,
@@ -2375,7 +2397,7 @@ static void sna_dri2_xchg_crtc(struct sna *sna, DrawablePtr draw, xf86CrtcPtr cr
get_window_pixmap(win)->drawable.serialNumber,
get_window_pixmap(win)->drawable.width,
get_window_pixmap(win)->drawable.height));
- assert(can_xchg_crtc(to_sna_from_drawable(draw), draw, crtc, front, back));
+ assert(can_xchg_crtc(sna, draw, crtc, front, back));
if (APPLY_DAMAGE) {
DBG(("%s: marking drawable as damaged\n", __FUNCTION__));
@@ -2388,69 +2410,72 @@ static void sna_dri2_xchg_crtc(struct sna *sna, DrawablePtr draw, xf86CrtcPtr cr
sna->ignore_copy_area = false;
}
- tmp = calloc(1, sizeof(*tmp) + sizeof(struct sna_dri2_private));
- if (tmp == NULL) {
- back->attachment = -1;
- if (get_private(back)->proxy == NULL) {
- get_private(back)->pixmap = get_private(front)->pixmap;
- get_private(back)->proxy = sna_dri2_reference_buffer(get_private(front)->proxy ?: front);
+ if (priv->front == NULL) {
+ DRI2Buffer2Ptr tmp;
+
+ tmp = calloc(1, sizeof(*tmp) + sizeof(struct sna_dri2_private));
+ if (tmp == NULL) {
+ sna_shadow_unset_crtc(sna, crtc);
+ return;
}
- if (priv->front) {
- assert(front == priv->front);
- assert(get_private(priv->front)->refcnt > 1);
- get_private(priv->front)->refcnt--;
+ tmp->attachment = DRI2BufferFrontLeft;
+ tmp->driverPrivate = tmp + 1;
+ tmp->cpp = back->cpp;
+ tmp->format = back->format;
+
+ get_private(tmp)->refcnt = 1;
+ get_private(tmp)->bo = kgem_create_2d(&sna->kgem,
+ draw->width, draw->height, draw->bitsPerPixel,
+ get_private(back)->bo->tiling,
+ CREATE_SCANOUT | CREATE_EXACT);
+ if (get_private(tmp)->bo != NULL) {
+ tmp->pitch = get_private(tmp)->bo->pitch;
+ tmp->name = kgem_bo_flink(&sna->kgem, get_private(tmp)->bo);
}
- priv->front = sna_dri2_reference_buffer(back);
- return;
+ if (tmp->name == 0) {
+ if (get_private(tmp)->bo != NULL)
+ kgem_bo_destroy(&sna->kgem, get_private(tmp)->bo);
+ sna_shadow_unset_crtc(sna, crtc);
+ return;
+ }
+ get_private(tmp)->size = get_private(back)->size;
+ get_private(tmp)->pixmap = get_private(front)->pixmap;
+ get_private(tmp)->proxy = sna_dri2_reference_buffer(front);
+ get_private(tmp)->bo->active_scanout++;
+
+ priv->front = front = tmp;
}
+ assert(front == priv->front);
- *tmp = *back;
- tmp->attachment = DRI2BufferFrontLeft;
- tmp->driverPrivate = tmp + 1;
- get_private(tmp)->refcnt = 1;
- get_private(tmp)->bo = get_private(back)->bo;
- get_private(tmp)->size = get_private(back)->size;
- get_private(tmp)->pixmap = get_private(front)->pixmap;
- get_private(tmp)->proxy = sna_dri2_reference_buffer(get_private(front)->proxy ?: front);
- mark_stale(back);
+ {
+ struct kgem_bo *front_bo = get_private(front)->bo;
+ struct kgem_bo *back_bo = get_private(back)->bo;
+ unsigned tmp;
- if (priv->front) {
- DBG(("%s: replacing Window frontbuffer (was handle=%d) now handle=%d\n",
- __FUNCTION__,
- get_private(priv->front)->bo->handle,
- get_private(tmp)->bo->handle));
- assert(front == priv->front);
- assert(get_private(priv->front)->refcnt > 1);
- get_private(priv->front)->refcnt--;
- }
- priv->front = tmp;
-
- if (get_private(front)->proxy) {
- DBG(("%s: reusing current proxy frontbuffer\n", __FUNCTION__));
- front->attachment = DRI2BufferBackLeft;
- ref(get_private(tmp)->bo);
- back->attachment = DRI2BufferFrontLeft;
- } else {
- DBG(("%s: allocating new backbuffer\n", __FUNCTION__));
- back->name = 0;
- back->flags = 0;
- bo = kgem_create_2d(&sna->kgem,
- draw->width, draw->height, draw->bitsPerPixel,
- get_private(back)->bo->tiling,
- CREATE_SCANOUT | CREATE_EXACT);
- if (bo != NULL) {
- get_private(back)->bo = bo;
- back->pitch = bo->pitch;
- get_private(back)->size = draw->height << 16 | draw->width;
- back->name = kgem_bo_flink(&sna->kgem, bo);
- }
- if (back->name == 0) {
- if (bo != NULL)
- kgem_bo_destroy(&sna->kgem, bo);
- get_private(back)->bo = NULL;
- back->attachment = DRI2BufferFrontLeft;
- }
+ assert(front_bo->refcnt);
+ assert(back_bo->refcnt);
+
+ get_private(back)->bo = front_bo;
+ get_private(front)->bo = back_bo;
+ mark_stale(back);
+
+ assert(front_bo->active_scanout > 0);
+ front_bo->active_scanout--;
+ back_bo->active_scanout++;
+ assert(back_bo->active_scanout <= back_bo->refcnt);
+
+ tmp = front->name;
+ front->name = back->name;
+ back->name = tmp;
+
+ tmp = front->pitch;
+ front->pitch = back->pitch;
+ back->pitch = tmp;
+
+ tmp = front->flags;
+ front->flags = back->flags;
+ back->flags = tmp;
}
}
@@ -2562,6 +2587,7 @@ void sna_dri2_vblank_handler(struct drm_event_vblank *event)
goto done;
}
+ assert((info->front == NULL && info->back == NULL) || info->front != info->back);
switch (info->type) {
case FLIP:
/* If we can still flip... */
@@ -2611,6 +2637,12 @@ void sna_dri2_vblank_handler(struct drm_event_vblank *event)
}
if (info->pending.bo) {
+ DBG(("%s: swapping old back handle=%d [name=%d, active=%d] for pending handle=%d [name=%d, active=%d], front handle=%d [name=%d, active=%d]\n",
+ __FUNCTION__,
+ get_private(info->back)->bo->handle, info->back->name, get_private(info->back)->bo->active_scanout,
+ info->pending.bo->handle, info->pending.name, info->pending.bo->active_scanout,
+ get_private(info->front)->bo->handle, info->front->name, get_private(info->front)->bo->active_scanout));
+
if (sna->mode.shadow && sna->mode.shadow_wait) {
/* recursed from wait_for_shadow(), simply requeue */
DBG(("%s -- recursed from wait_for_shadow(), requeuing\n", __FUNCTION__));
@@ -2693,14 +2725,14 @@ sna_dri2_immediate_blit(struct sna *sna,
struct sna_dri2_event *info,
bool sync)
{
- DrawablePtr draw = info->draw;
- struct sna_dri2_event *chain = dri2_chain(draw);
+ struct sna_dri2_event *chain = dri2_chain(info->draw);
if (sna->flags & SNA_NO_WAIT)
sync = false;
DBG(("%s: emitting immediate blit, throttling client, synced? %d, chained? %d, pipe %d\n",
__FUNCTION__, sync, chain != info, info->pipe));
+ assert(chain);
info->type = SWAP_COMPLETE;
info->sync = sync;
@@ -2709,6 +2741,7 @@ sna_dri2_immediate_blit(struct sna *sna,
if (chain == info) {
DBG(("%s: no pending blit, starting chain\n", __FUNCTION__));
+ assert(info->front != info->back);
if (can_xchg(info->sna, info->draw, info->front, info->back)) {
sna_dri2_xchg(info->draw, info->front, info->back);
} else if (can_xchg_crtc(info->sna, info->draw, info->crtc,
@@ -2720,7 +2753,7 @@ sna_dri2_immediate_blit(struct sna *sna,
assert(info->signal);
- if ((!swap_limit(draw, 2 + !sync) && !sync) ||
+ if ((!swap_limit(info->draw, 2 + !sync) && !sync) ||
!sna_next_vblank(info)) {
DBG(("%s: fake triple buffering, unblocking client\n", __FUNCTION__));
frame_swap_complete(info, DRI2_BLIT_COMPLETE);
@@ -2729,8 +2762,13 @@ sna_dri2_immediate_blit(struct sna *sna,
return;
}
+ DBG(("%s: current event front=%d [name=%d, active?=%d], back=%d [name=%d, active?=%d]\n", __FUNCTION__,
+ get_private(chain->front)->bo->handle, chain->front->name, get_private(chain->front)->bo->active_scanout,
+ get_private(chain->back)->bo->handle, chain->back->name, get_private(chain->back)->bo->active_scanout));
+
if (chain->type == SWAP_COMPLETE) {
assert(chain->draw == info->draw);
+ assert(chain->front = info->front);
assert(chain->client == info->client);
assert(chain->event_complete == info->event_complete);
assert(chain->event_data == info->event_data);
@@ -2756,7 +2794,7 @@ sna_dri2_immediate_blit(struct sna *sna,
chain->pending.bo = NULL;
}
- if (chain->pending.bo == NULL && swap_limit(draw, 2 + !sync)) {
+ if (chain->pending.bo == NULL && swap_limit(info->draw, 2 + !sync)) {
DBG(("%s: setting handle=%d as pending blit (current event front=%d, back=%d)\n", __FUNCTION__,
get_private(info->back)->bo->handle,
get_private(chain->front)->bo->handle,
@@ -3076,14 +3114,18 @@ sna_dri2_schedule_flip(ClientPtr client, DrawablePtr draw, xf86CrtcPtr crtc,
if (info && info->draw == draw) {
assert(info->type != FLIP);
assert(info->queued);
+ assert(info->front != info->back);
if (info->front != front) {
- assert(info->front == NULL);
+ assert(info->front != NULL);
+ _sna_dri2_destroy_buffer(sna, draw, info->front);
info->front = sna_dri2_reference_buffer(front);
}
if (info->back != back) {
+ assert(info->back != NULL);
_sna_dri2_destroy_buffer(sna, draw, info->back);
info->back = sna_dri2_reference_buffer(back);
}
+ assert(info->front != info->back);
DBG(("%s: executing xchg of pending flip: flip_continue=%d, keepalive=%d, chain?=%d\n", __FUNCTION__, info->flip_continue, info->keepalive, current_msc < *target_msc));
sna_dri2_xchg(draw, front, back);
info->keepalive = KEEPALIVE;
@@ -3111,6 +3153,7 @@ sna_dri2_schedule_flip(ClientPtr client, DrawablePtr draw, xf86CrtcPtr crtc,
assert(info->draw);
info->signal = true;
+ assert(front != back);
info->front = sna_dri2_reference_buffer(front);
info->back = sna_dri2_reference_buffer(back);
@@ -3174,6 +3217,7 @@ queue:
info->signal = true;
info->type = FLIP;
+ assert(front != back);
info->front = sna_dri2_reference_buffer(front);
info->back = sna_dri2_reference_buffer(back);
@@ -3271,8 +3315,11 @@ sna_dri2_schedule_swap(ClientPtr client, DrawablePtr draw, DRI2BufferPtr front,
WindowPtr win = (WindowPtr)draw;
struct dri2_window *priv = dri2_window(win);
- if (priv->front)
+ if (priv->front) {
front = priv->front;
+ assert(front->attachment == DRI2BufferFrontLeft);
+ assert(get_private(front)->refcnt);
+ }
if (win->clipList.extents.x2 <= win->clipList.extents.x1 ||
win->clipList.extents.y2 <= win->clipList.extents.y1) {
@@ -3286,6 +3333,8 @@ sna_dri2_schedule_swap(ClientPtr client, DrawablePtr draw, DRI2BufferPtr front,
}
}
+ DBG(("%s: using front handle=%d, active_scanout?=%d\n", __FUNCTION__, get_private(front)->bo->handle, get_private(front)->bo->active_scanout));
+ assert(get_private(front)->bo->active_scanout);
if (get_private(front)->pixmap != get_drawable_pixmap(draw)) {
DBG(("%s: decoupled DRI2 front pixmap=%ld, actual pixmap=%ld\n",
__FUNCTION__,
@@ -3331,6 +3380,7 @@ sna_dri2_schedule_swap(ClientPtr client, DrawablePtr draw, DRI2BufferPtr front,
assert(info->draw);
info->signal = true;
+ assert(front != back);
info->front = sna_dri2_reference_buffer(front);
info->back = sna_dri2_reference_buffer(back);
@@ -3396,8 +3446,10 @@ skip:
assert(info->draw);
info->signal = true;
- info->front = sna_dri2_reference_buffer(front);
- info->back = sna_dri2_reference_buffer(back);
+ if (info->front == NULL)
+ info->front = sna_dri2_reference_buffer(front);
+ if (info->back == NULL)
+ info->back = sna_dri2_reference_buffer(back);
if (!sna_next_vblank(info))
goto fake;
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