drm/amdgpu: check entity lock is held in amdgpu_ttm_job_submit

drm_sched_job_arm and drm_sched_entity_push_job must be called
under the same lock to guarantee the order of execution.

This commit adds a check in amdgpu_ttm_job_submit and fix the
places where the lock was missing.

Signed-off-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 8 insertions, 5 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 9c8f1b3e1b1b..17121cdc76b7 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -163,7 +163,8 @@ static void amdgpu_evict_flags(struct ttm_buffer_object *bo,
 }
 
 static struct dma_fence *
-amdgpu_ttm_job_submit(struct amdgpu_device *adev, struct amdgpu_job *job, u32 num_dw)
+amdgpu_ttm_job_submit(struct amdgpu_device *adev, struct amdgpu_ttm_buffer_entity *entity,
+		      struct amdgpu_job *job, u32 num_dw)
 {
 	struct amdgpu_ring *ring;
 
@@ -171,6 +172,8 @@ amdgpu_ttm_job_submit(struct amdgpu_device *adev, struct amdgpu_job *job, u32 nu
 	amdgpu_ring_pad_ib(ring, &job->ibs[0]);
 	WARN_ON(job->ibs[0].length_dw > num_dw);
 
+	lockdep_assert_held(&entity->lock);
+
 	return amdgpu_job_submit(job);
 }
 
@@ -267,7 +270,7 @@ static int amdgpu_ttm_map_buffer(struct amdgpu_ttm_buffer_entity *entity,
 		amdgpu_gart_map_vram_range(adev, pa, 0, num_pages, flags, cpu_addr);
 	}
 
-	dma_fence_put(amdgpu_ttm_job_submit(adev, job, num_dw));
+	dma_fence_put(amdgpu_ttm_job_submit(adev, entity, job, num_dw));
 	return 0;
 }
 
@@ -1589,7 +1592,7 @@ static int amdgpu_ttm_access_memory_sdma(struct ttm_buffer_object *bo,
 	amdgpu_emit_copy_buffer(adev, &job->ibs[0], src_addr, dst_addr,
 				PAGE_SIZE, 0);
 
-	fence = amdgpu_ttm_job_submit(adev, job, num_dw);
+	fence = amdgpu_ttm_job_submit(adev, &adev->mman.default_entity, job, num_dw);
 	mutex_unlock(&adev->mman.default_entity.lock);
 
 	if (!dma_fence_wait_timeout(fence, false, adev->sdma_timeout))
@@ -2486,7 +2489,7 @@ int amdgpu_copy_buffer(struct amdgpu_device *adev,
 		byte_count -= cur_size_in_bytes;
 	}
 
-	*fence = amdgpu_ttm_job_submit(adev, job, num_dw);
+	*fence = amdgpu_ttm_job_submit(adev, entity, job, num_dw);
 
 	return 0;
 
@@ -2529,7 +2532,7 @@ static int amdgpu_ttm_fill_mem(struct amdgpu_device *adev,
 		byte_count -= cur_size;
 	}
 
-	*fence = amdgpu_ttm_job_submit(adev, job, num_dw);
+	*fence = amdgpu_ttm_job_submit(adev, entity, job, num_dw);
 	return 0;
 }