[PATCH 4/7] drm/amd/display: Use validated tiling_flags and tmz_surface in commit_tail

[Rodrigo Siqueira]

Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira at amd.com>

On 07/30, Nicholas Kazlauskas wrote:
> [Why]
> So we're not racing with userspace or deadlocking DM.
> 
> [How]
> These flags are now stored on dm_plane_state itself and acquried and
> validated during commit_check, so just use those instead.
> 
> Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
> Cc: Bhawanpreet Lakha <Bhawanpreet.Lakha at amd.com>
> Cc: Rodrigo Siqueira <Rodrigo.Siqueira at amd.com>
> Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>
> ---
>  .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c  | 18 ++++--------------
>  1 file changed, 4 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index f78c09c9585e..0d5f45742bb5 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -7094,8 +7094,6 @@ static void amdgpu_dm_commit_planes(struct drm_atomic_state *state,
>  	long r;
>  	unsigned long flags;
>  	struct amdgpu_bo *abo;
> -	uint64_t tiling_flags;
> -	bool tmz_surface = false;
>  	uint32_t target_vblank, last_flip_vblank;
>  	bool vrr_active = amdgpu_dm_vrr_active(acrtc_state);
>  	bool pflip_present = false;
> @@ -7179,20 +7177,12 @@ static void amdgpu_dm_commit_planes(struct drm_atomic_state *state,
>  		if (unlikely(r <= 0))
>  			DRM_ERROR("Waiting for fences timed out!");
>  
> -		/*
> -		 * We cannot reserve buffers here, which means the normal flag
> -		 * access functions don't work. Paper over this with READ_ONCE,
> -		 * but maybe the flags are invariant enough that not even that
> -		 * would be needed.
> -		 */
> -		tiling_flags = READ_ONCE(abo->tiling_flags);
> -		tmz_surface = READ_ONCE(abo->flags) & AMDGPU_GEM_CREATE_ENCRYPTED;
> -
>  		fill_dc_plane_info_and_addr(
> -			dm->adev, new_plane_state, tiling_flags,
> +			dm->adev, new_plane_state,
> +			dm_new_plane_state->tiling_flags,
>  			&bundle->plane_infos[planes_count],
> -			&bundle->flip_addrs[planes_count].address, tmz_surface,
> -			false);
> +			&bundle->flip_addrs[planes_count].address,
> +			dm_new_plane_state->tmz_surface, false);
>  
>  		DRM_DEBUG_DRIVER("plane: id=%d dcc_en=%d\n",
>  				 new_plane_state->plane->index,
> -- 
> 2.25.1
> 

-- 
Rodrigo Siqueira
https://siqueira.tech
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