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

[Marek Olšák]

GDS memory isn't used on gfx11. Only GDS OA is used.

Marek

On Thu, Apr 6, 2023 at 5:09 AM Christian König <christian.koenig at amd.com>
wrote:

> 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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