[PATCH] drm/amdgpu: Add DCC GFX12 flag to enable address alignment

[Alex Deucher]

On Mon, Aug 5, 2024 at 10:10 AM Arunpravin Paneer Selvam
<Arunpravin.PaneerSelvam at amd.com> wrote:
>
> We require this flag AMDGPU_GEM_CREATE_GFX12_DCC or any other
> kernel level GFX12 DCC flag to differentiate the DCC buffers and other
> pinned display buffers(which has TTM_PL_FLAG_CONTIGUOUS enabled).
>
> If we use the TTM_PL_FLAG_CONTIGUOUS flag for DCC buffers, we may over
> allocate for all the pinned display buffers unnecessarily that leads to
> memory allocation failure.
>
> Signed-off-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam at amd.com>

Acked-by: Alex Deucher <alexander.deucher at amd.com>

> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
> index 5415a5cc7789..7de0ac07a060 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
> @@ -509,7 +509,8 @@ static int amdgpu_vram_mgr_new(struct ttm_resource_manager *man,
>                 /* Allocate blocks in desired range */
>                 vres->flags |= DRM_BUDDY_RANGE_ALLOCATION;
>
> -       if (adev->gmc.gmc_funcs->get_dcc_alignment)
> +       if (bo->flags & AMDGPU_GEM_CREATE_GFX12_DCC &&
> +           adev->gmc.gmc_funcs->get_dcc_alignment)
>                 adjust_dcc_size = amdgpu_gmc_get_dcc_alignment(adev);
>
>         remaining_size = (u64)vres->base.size;
> --
> 2.25.1
>