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Subject[PATCH v3 0/3] Reduce context clear batch size to avoid gpu hang
From: Randy Wright <>

For several months, I've been experiencing GPU hangs when starting
Cinnamon on an HP Pavilion Mini 300-020 if I try to run an upstream
kernel. I reported this recently in where I have
attached the requested evidence including the state collected from
/sys/class/drm/card0/error and debug output from dmesg.

I ran a bisect to find the problem, which indicates this is the
troublesome commit:

[47f8253d2b8947d79fd3196bf96c1959c0f25f20] drm/i915/gen7: Clear all EU/L3 residual contexts

The nature of that commit suggested to me that reducing the
batch size used in the context clear operation might help this
relatively low-powered system to avoid the hang.... and it did!
I simply forced this system to take the smaller batch length that is
already used for non-Haswell systems.

The first two versions of this patch were posted as RFC
patches to the Intel-gfx list, implementing the same
algorithmic change in function batch_get_defaults,
but without employing a properly constructed quirk.

I've now cleaned up the patch to employ a new QUIRK_RENDERCLEAR_REDUCED.
The quirk is presently set only for the aforementioned HP Pavilion Mini
300-020. The patch now touches three files to define the quirk, set it,
and then check for it in function batch_get_defaults.

Randy Wright (3):
drm/i915: Introduce quirk QUIRK_RENDERCLEAR_REDUCED
drm/i915/display: Add function quirk_renderclear_reduced
drm/i915/gt: Force reduced batch size if new QUIRK_RENDERCLEAR_REDUCED
is set.

drivers/gpu/drm/i915/display/intel_quirks.c | 13 +++++++++++++
drivers/gpu/drm/i915/gt/gen7_renderclear.c | 2 +-
drivers/gpu/drm/i915/i915_drv.h | 1 +
3 files changed, 15 insertions(+), 1 deletion(-)


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