Re: [PATCH 8/8] drm/panfrost: Make sure the shrinker does not reclaim referenced BOs

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On 29/11/2019 1:59 pm, Boris Brezillon wrote:
Userspace might tag a BO purgeable while it's still referenced by GPU
jobs. We need to make sure the shrinker does not purge such BOs until
all jobs referencing it are finished.

Nit: for extra robustness, perhaps it's worth using the refcount_t API rather than bare atomic_t?

Robin.

Fixes: 013b65101315 ("drm/panfrost: Add madvise and shrinker support")
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
---
  drivers/gpu/drm/panfrost/panfrost_drv.c          | 1 +
  drivers/gpu/drm/panfrost/panfrost_gem.h          | 6 ++++++
  drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c | 2 ++
  drivers/gpu/drm/panfrost/panfrost_job.c          | 7 ++++++-
  4 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c
index b406b5243b40..297c0e7304d2 100644
--- a/drivers/gpu/drm/panfrost/panfrost_drv.c
+++ b/drivers/gpu/drm/panfrost/panfrost_drv.c
@@ -166,6 +166,7 @@ panfrost_lookup_bos(struct drm_device *dev,
  			break;
  		}
+ atomic_inc(&bo->gpu_usecount);
  		job->mappings[i] = mapping;
  	}
diff --git a/drivers/gpu/drm/panfrost/panfrost_gem.h b/drivers/gpu/drm/panfrost/panfrost_gem.h
index ca1bc9019600..b3517ff9630c 100644
--- a/drivers/gpu/drm/panfrost/panfrost_gem.h
+++ b/drivers/gpu/drm/panfrost/panfrost_gem.h
@@ -30,6 +30,12 @@ struct panfrost_gem_object {
  		struct mutex lock;
  	} mappings;
+ /*
+	 * Count the number of jobs referencing this BO so we don't let the
+	 * shrinker reclaim this object prematurely.
+	 */
+	atomic_t gpu_usecount;
+
  	bool noexec		:1;
  	bool is_heap		:1;
  };
diff --git a/drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c b/drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c
index b36df326c860..288e46c40673 100644
--- a/drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c
+++ b/drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c
@@ -41,6 +41,8 @@ static bool panfrost_gem_purge(struct drm_gem_object *obj)
  	struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
  	struct panfrost_gem_object *bo = to_panfrost_bo(obj);
+ if (atomic_read(&bo->gpu_usecount))
+		return false;
if (!mutex_trylock(&shmem->pages_lock))
  		return false;
diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c b/drivers/gpu/drm/panfrost/panfrost_job.c
index c85d45be3b5e..2b12aa87ff32 100644
--- a/drivers/gpu/drm/panfrost/panfrost_job.c
+++ b/drivers/gpu/drm/panfrost/panfrost_job.c
@@ -270,8 +270,13 @@ static void panfrost_job_cleanup(struct kref *ref)
  	dma_fence_put(job->render_done_fence);
if (job->mappings) {
-		for (i = 0; i < job->bo_count; i++)
+		for (i = 0; i < job->bo_count; i++) {
+			if (!job->mappings[i])
+				break;
+
+			atomic_dec(&job->mappings[i]->obj->gpu_usecount);
  			panfrost_gem_mapping_put(job->mappings[i]);
+		}
  		kvfree(job->mappings);
  	}
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