drm/msm: Fix premature purging of BO

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In the case where we have a back-to-back submission that shares the same
BO, this BO will be prematurely moved to inactive_list while retiring the
first submit. But it will be still part of the second submit which is
being processed by the GPU. Now, if the shrinker happens to be triggered at
this point, it will result in a premature purging of this BO.

To fix this, we need to refcount BO while doing submit and retire. Then,
it should be moved to inactive list when this refcount becomes 0.

Signed-off-by: Akhil P Oommen <akhilpo@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>

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This commit is contained in:

Akhil P Oommen 2020-09-22 20:25:26 +05:30 • committed by Rob Clark

parent ca9b38e6d6

commit 9d8baa2bf2

4 changed files with 28 additions and 24 deletions

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5

drivers/gpu/drm/msm/msm_drv.h

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32

drivers/gpu/drm/msm/msm_gem.c

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4

drivers/gpu/drm/msm/msm_gem.h

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11

drivers/gpu/drm/msm/msm_gpu.c

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