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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>
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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4
drivers/gpu/drm/msm/msm_gem.h
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@@ -88,12 +88,14 @@ struct msm_gem_object {
struct mutex lock; /* Protects resources associated with bo */
char name[32]; /* Identifier to print for the debugfs files */
atomic_t active_count;
};
#define to_msm_bo(x) container_of(x, struct msm_gem_object, base)
static inline bool is_active(struct msm_gem_object *msm_obj)
{
return msm_obj->gpu != NULL;
return atomic_read(&msm_obj->active_count);
}
static inline bool is_purgeable(struct msm_gem_object *msm_obj)