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Revert "drm/qxl: simplify qxl_fence_wait"

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This reverts commit 5a838e5d58.

Changes from commit 5a838e5d58 ("drm/qxl: simplify qxl_fence_wait") would
result in a '[TTM] Buffer eviction failed' exception whenever it reached a
timeout.
Due to a dependency to DMA_FENCE_WARN this also restores some code deleted
by commit d72277b6c3 ("dma-buf: nuke DMA_FENCE_TRACE macros v2").

Fixes: 5a838e5d58 ("drm/qxl: simplify qxl_fence_wait")
Link: https://lore.kernel.org/regressions/ZTgydqRlK6WX_b29@eldamar.lan/
Reported-by: Timo Lindfors <timo.lindfors@iki.fi>
Closes: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1054514
Signed-off-by: Alex Constantino <dreaming.about.electric.sheep@gmail.com>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240404181448.1643-2-dreaming.about.electric.sheep@gmail.com
This commit is contained in:
Alex Constantino 2024-04-04 19:14:48 +01:00 committed by Maxime Ripard
parent bc004f5038
commit 07ed11afb6
No known key found for this signature in database
GPG Key ID: 275FCE19A23DBE76
2 changed files with 52 additions and 5 deletions
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50
drivers/gpu/drm/qxl/qxl_release.c
View File

@ -58,16 +58,56 @@ static long qxl_fence_wait(struct dma_fence *fence, bool intr,
signed long timeout)
{
struct qxl_device *qdev;
struct qxl_release *release;
int count = 0, sc = 0;
bool have_drawable_releases;
unsigned long cur, end = jiffies + timeout;
qdev = container_of(fence->lock, struct qxl_device, release_lock);
release = container_of(fence, struct qxl_release, base);
have_drawable_releases = release->type == QXL_RELEASE_DRAWABLE;
if (!wait_event_timeout(qdev->release_event,
(dma_fence_is_signaled(fence) ||
(qxl_io_notify_oom(qdev), 0)),
timeout))
return 0;
retry:
sc++;
if (dma_fence_is_signaled(fence))
goto signaled;
qxl_io_notify_oom(qdev);
for (count = 0; count < 11; count++) {
if (!qxl_queue_garbage_collect(qdev, true))
break;
if (dma_fence_is_signaled(fence))
goto signaled;
}
if (dma_fence_is_signaled(fence))
goto signaled;
if (have_drawable_releases || sc < 4) {
if (sc > 2)
/* back off */
usleep_range(500, 1000);
if (time_after(jiffies, end))
return 0;
if (have_drawable_releases && sc > 300) {
DMA_FENCE_WARN(fence,
"failed to wait on release %llu after spincount %d\n",
fence->context & ~0xf0000000, sc);
goto signaled;
}
goto retry;
}
/*
* yeah, original sync_obj_wait gave up after 3 spins when
* have_drawable_releases is not set.
*/
signaled:
cur = jiffies;
if (time_after(cur, end))
return 0;

7
include/linux/dma-fence.h
View File

@ -682,4 +682,11 @@ static inline bool dma_fence_is_container(struct dma_fence *fence)
return dma_fence_is_array(fence) || dma_fence_is_chain(fence);
}
#define DMA_FENCE_WARN(f, fmt, args...) \
do { \
struct dma_fence *__ff = (f); \
pr_warn("f %llu#%llu: " fmt, __ff->context, __ff->seqno,\
##args); \
} while (0)
#endif /* __LINUX_DMA_FENCE_H */