[PATCH 03/13] drm/amdgpu/UAPI: add new CS chunk for GFX shadow buffers

[Christian König]

Why that?

This is the save buffer for GDS, not the old style GDS BOs.

Christian.

Am 06.04.23 um 09:36 schrieb Marek Olšák:
> gds_va is unnecessary.
>
> Marek
>
> On Thu, Mar 30, 2023 at 3:18 PM Alex Deucher 
> <alexander.deucher at amd.com> wrote:
>
>     For GFX11, the UMD needs to allocate some shadow buffers
>     to be used for preemption.  The UMD allocates the buffers
>     and passes the GPU virtual address to the kernel since the
>     kernel will program the packet that specified these
>     addresses as part of its IB submission frame.
>
>     v2: UMD passes shadow init to tell kernel when to initialize
>         the shadow
>
>     Reviewed-by: Christian König <christian.koenig at amd.com>
>     Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
>     ---
>      include/uapi/drm/amdgpu_drm.h | 10 ++++++++++
>      1 file changed, 10 insertions(+)
>
>     diff --git a/include/uapi/drm/amdgpu_drm.h
>     b/include/uapi/drm/amdgpu_drm.h
>     index b6eb90df5d05..3d9474af6566 100644
>     --- a/include/uapi/drm/amdgpu_drm.h
>     +++ b/include/uapi/drm/amdgpu_drm.h
>     @@ -592,6 +592,7 @@ struct drm_amdgpu_gem_va {
>      #define AMDGPU_CHUNK_ID_SCHEDULED_DEPENDENCIES 0x07
>      #define AMDGPU_CHUNK_ID_SYNCOBJ_TIMELINE_WAIT    0x08
>      #define AMDGPU_CHUNK_ID_SYNCOBJ_TIMELINE_SIGNAL  0x09
>     +#define AMDGPU_CHUNK_ID_CP_GFX_SHADOW   0x0a
>
>      struct drm_amdgpu_cs_chunk {
>             __u32           chunk_id;
>     @@ -708,6 +709,15 @@ struct drm_amdgpu_cs_chunk_data {
>             };
>      };
>
>     +#define AMDGPU_CS_CHUNK_CP_GFX_SHADOW_FLAGS_INIT_SHADOW    0x1
>     +
>     +struct drm_amdgpu_cs_chunk_cp_gfx_shadow {
>     +       __u64 shadow_va;
>     +       __u64 csa_va;
>     +       __u64 gds_va;
>     +       __u64 flags;
>     +};
>     +
>      /*
>       *  Query h/w info: Flag that this is integrated (a.h.a. fusion) GPU
>       *
>     -- 
>     2.39.2
>
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