This reverts commit 5a838e5d5825c85556011478abde708251cc0776.
Changes from commit 5a838e5d5825 ("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 d72277b6c37d ("dma-buf: nuke DMA_FENCE_TRACE macros v2").
Fixes: 5a838e5d5825 ("drm/qxl: simplify qxl_fence_wait")
Link: https://lore.kernel.org/regressions/[email protected]/
Reported-by: Timo Lindfors <[email protected]>
Closes: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1054514
Signed-off-by: Alex Constantino <[email protected]>
---
drivers/gpu/drm/qxl/qxl_release.c | 50 +++++++++++++++++++++++++++----
include/linux/dma-fence.h | 7 +++++
2 files changed, 52 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/qxl/qxl_release.c b/drivers/gpu/drm/qxl/qxl_release.c
index 368d26da0d6a..9febc8b73f09 100644
--- a/drivers/gpu/drm/qxl/qxl_release.c
+++ b/drivers/gpu/drm/qxl/qxl_release.c
@@ -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;
diff --git a/include/linux/dma-fence.h b/include/linux/dma-fence.h
index e06bad467f55..c3f9bb6602ba 100644
--- a/include/linux/dma-fence.h
+++ b/include/linux/dma-fence.h
@@ -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 */
--
2.39.2
On Thu, Apr 04, 2024 at 07:14:48PM +0100, Alex Constantino wrote:
> This reverts commit 5a838e5d5825c85556011478abde708251cc0776.
>
> Changes from commit 5a838e5d5825 ("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 d72277b6c37d ("dma-buf: nuke DMA_FENCE_TRACE macros v2").
>
> Fixes: 5a838e5d5825 ("drm/qxl: simplify qxl_fence_wait")
> Link: https://lore.kernel.org/regressions/[email protected]/
> Reported-by: Timo Lindfors <[email protected]>
> Closes: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1054514
> Signed-off-by: Alex Constantino <[email protected]>
> ---
> drivers/gpu/drm/qxl/qxl_release.c | 50 +++++++++++++++++++++++++++----
> include/linux/dma-fence.h | 7 +++++
> 2 files changed, 52 insertions(+), 5 deletions(-)
Hi,
This is the friendly patch-bot of Greg Kroah-Hartman. You have sent him
a patch that has triggered this response. He used to manually respond
to these common problems, but in order to save his sanity (he kept
writing the same thing over and over, yet to different people), I was
created. Hopefully you will not take offence and will fix the problem
in your patch and resubmit it so that it can be accepted into the Linux
kernel tree.
You are receiving this message because of the following common error(s)
as indicated below:
- You have marked a patch with a "Fixes:" tag for a commit that is in an
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applied to any older kernel releases. To properly fix this, please
follow the documented rules in the
Documentation/process/stable-kernel-rules.rst file for how to resolve
this.
If you wish to discuss this problem further, or you have questions about
how to resolve this issue, please feel free to respond to this email and
Greg will reply once he has dug out from the pending patches received
from other developers.
thanks,
greg k-h's patch email bot
On Thu, 04 Apr 2024 19:14:48 +0100, Alex Constantino wrote:
> This reverts commit 5a838e5d5825c85556011478abde708251cc0776.
>
> Changes from commit 5a838e5d5825 ("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 d72277b6c37d ("dma-buf: nuke DMA_FENCE_TRACE macros v2").
>
> [...]
Applied to misc/kernel.git (drm-misc-fixes).
Thanks!
Maxime