drm/msm/gem: Add fenced vma unpin

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With userspace allocated iova (next patch), we can have a race condition
where userspace observes the fence completion and deletes the vma before
retire_submit() gets around to unpinning the vma.  To handle this, add a
fenced unpin which drops the refcount but tracks the fence, and update
msm_gem_vma_inuse() to check any previously unsignaled fences.

v2: Fix inuse underflow (duplicate unpin)
v3: Fix msm_job_run() vs submit_cleanup() race condition

Signed-off-by: Rob Clark <robdclark@chromium.org>
Link: https://lore.kernel.org/r/20220411215849.297838-10-robdclark@gmail.com
Signed-off-by: Rob Clark <robdclark@chromium.org>

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This commit is contained in:

Rob Clark 2022-04-11 14:58:38 -07:00

parent 27674c6668

commit 95d1deb02a

7 changed files with 66 additions and 17 deletions

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6

drivers/gpu/drm/msm/msm_fence.c

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3

drivers/gpu/drm/msm/msm_fence.h

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2

drivers/gpu/drm/msm/msm_gem.c

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14

drivers/gpu/drm/msm/msm_gem.h

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15

drivers/gpu/drm/msm/msm_gem_submit.c

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30

drivers/gpu/drm/msm/msm_gem_vma.c

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13

drivers/gpu/drm/msm/msm_ringbuffer.c

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