On 11/21/25 11:12, Pierre-Eric Pelloux-Prayer wrote:
> This makes clear of different BOs run in parallel. Partial jobs to
> clear a single BO still execute sequentially.
>
> Signed-off-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 4 ++--
> drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 12 ++++++++++++
> drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h | 2 ++
> 3 files changed, 16 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> index 56663e82efef..7d8d70135cc2 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> @@ -1322,8 +1322,8 @@ void amdgpu_bo_release_notify(struct ttm_buffer_object *bo)
> if (r)
> goto out;
>
> - r = amdgpu_fill_buffer(adev,
> - &adev->mman.clear_entities[0], abo, 0, &bo->base._resv,
> + r = amdgpu_fill_buffer(adev, amdgpu_ttm_next_clear_entity(adev),
> + abo, 0, &bo->base._resv,
> &fence, AMDGPU_KERNEL_JOB_ID_CLEAR_ON_RELEASE);
> if (WARN_ON(r))
> goto out;
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> index 438e8a3b7a06..8d70bea66dd0 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> @@ -2277,6 +2277,7 @@ u32 amdgpu_ttm_set_buffer_funcs_status(struct amdgpu_device *adev, bool enable)
> adev->mman.clear_entities = kcalloc(num_clear_entities,
> sizeof(struct amdgpu_ttm_buffer_entity),
> GFP_KERNEL);
> + atomic_set(&adev->mman.next_clear_entity, 0);
> if (!adev->mman.clear_entities)
> goto error_free_entity;
>
> @@ -2576,6 +2577,17 @@ int amdgpu_fill_buffer(struct amdgpu_device *adev,
> return r;
> }
>
> +struct amdgpu_ttm_buffer_entity *
> +amdgpu_ttm_next_clear_entity(struct amdgpu_device *adev)
> +{
> + struct amdgpu_mman *mman = &adev->mman;
> + int i;
> +
> + i = atomic_inc_return(&mman->next_clear_entity) %
> + mman->num_clear_entities;
> + return &mman->clear_entities[i];
> +}
> +
> /**
> * amdgpu_ttm_evict_resources - evict memory buffers
> * @adev: amdgpu device object
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
> index eabc5a1549e9..887531126d9d 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
> @@ -73,6 +73,7 @@ struct amdgpu_mman {
>
> struct amdgpu_ttm_buffer_entity default_entity; /* has no gart windows */
> struct amdgpu_ttm_buffer_entity *clear_entities;
> + atomic_t next_clear_entity;
> u32 num_clear_entities;
> struct amdgpu_ttm_buffer_entity move_entities[TTM_NUM_MOVE_FENCES];
> u32 num_move_entities;
> @@ -189,6 +190,7 @@ int amdgpu_fill_buffer(struct amdgpu_device *adev,
> struct dma_resv *resv,
> struct dma_fence **f,
> u64 k_job_id);
> +struct amdgpu_ttm_buffer_entity *amdgpu_ttm_next_clear_entity(struct amdgpu_device *adev);
>
> int amdgpu_ttm_alloc_gart(struct ttm_buffer_object *bo);
> void amdgpu_ttm_recover_gart(struct ttm_buffer_object *tbo);