[PATCH 1/3] drm/amdgpu: implicitly sync the dependent read fences

[Liang, Prike]

[Public]

Will send a new patch for updating the patch subject.

Regards,
      Prike

> -----Original Message-----
> From: Liang, Prike <Prike.Liang at amd.com>
> Sent: Friday, April 25, 2025 3:07 PM
> To: amd-gfx at lists.freedesktop.org
> Cc: Deucher, Alexander <Alexander.Deucher at amd.com>; Koenig, Christian
> <Christian.Koenig at amd.com>; Liang, Prike <Prike.Liang at amd.com>
> Subject: [PATCH 1/3] drm/amdgpu: implicitly sync the dependent read fences
>
> The driver doesn't want to sync on the DMA_RESV_USAGE_BOOKKEEP usage
> fences, so here only return and sync the dependent read fences.
>
> Signed-off-by: Prike Liang <Prike.Liang at amd.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
> index 5576ed0b508f..4e1d30ecb6cc 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
> @@ -249,9 +249,8 @@ int amdgpu_sync_resv(struct amdgpu_device *adev,
> struct amdgpu_sync *sync,
>
>       if (resv == NULL)
>               return -EINVAL;
> -
> -     /* TODO: Use DMA_RESV_USAGE_READ here */
> -     dma_resv_for_each_fence(&cursor, resv,
> DMA_RESV_USAGE_BOOKKEEP, f) {
> +     /*Only return and sync the fences of usage <=
> DMA_RESV_USAGE_READ.*/
> +     dma_resv_for_each_fence(&cursor, resv, DMA_RESV_USAGE_READ, f) {
>               dma_fence_chain_for_each(f, f) {
>                       struct dma_fence *tmp = dma_fence_chain_contained(f);
>
> --
> 2.34.1