[PATCH v2 1/5] drm/amdgpu: add UAPI for workload hints to ctx ioctl

[Christian König]

Am 26.09.22 um 17:02 schrieb Shashank Sharma:
> Allow the user to specify a workload hint to the kernel.
> We can use these to tweak the dpm heuristics to better match
> the workload for improved performance.
>
> Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
> Signed-off-by: Shashank Sharma <shashank.sharma at amd.com>
> ---
>   include/uapi/drm/amdgpu_drm.h | 18 ++++++++++++++++++
>   1 file changed, 18 insertions(+)
>
> diff --git a/include/uapi/drm/amdgpu_drm.h b/include/uapi/drm/amdgpu_drm.h
> index c2c9c674a223..da5019a6e233 100644
> --- a/include/uapi/drm/amdgpu_drm.h
> +++ b/include/uapi/drm/amdgpu_drm.h
> @@ -212,6 +212,8 @@ union drm_amdgpu_bo_list {
>   #define AMDGPU_CTX_OP_QUERY_STATE2	4
>   #define AMDGPU_CTX_OP_GET_STABLE_PSTATE	5
>   #define AMDGPU_CTX_OP_SET_STABLE_PSTATE	6
> +#define AMDGPU_CTX_OP_GET_WORKLOAD_PROFILE	7

Do we really have an use case for getting the profile or is that just 
added for completeness?

At base minimum we need a test-case for both to exercise the UAPI.

Regards,
Christian.

> +#define AMDGPU_CTX_OP_SET_WORKLOAD_PROFILE	8
>   
>   /* GPU reset status */
>   #define AMDGPU_CTX_NO_RESET		0
> @@ -252,6 +254,17 @@ union drm_amdgpu_bo_list {
>   #define AMDGPU_CTX_STABLE_PSTATE_MIN_MCLK  3
>   #define AMDGPU_CTX_STABLE_PSTATE_PEAK  4
>   
> +/* GPU workload hints, flag bits 8-15 */
> +#define AMDGPU_CTX_WORKLOAD_HINT_SHIFT     8
> +#define AMDGPU_CTX_WORKLOAD_HINT_MASK      (0xff << AMDGPU_CTX_WORKLOAD_HINT_SHIFT)
> +#define AMDGPU_CTX_WORKLOAD_HINT_NONE      (0 << AMDGPU_CTX_WORKLOAD_HINT_SHIFT)
> +#define AMDGPU_CTX_WORKLOAD_HINT_3D        (1 << AMDGPU_CTX_WORKLOAD_HINT_SHIFT)
> +#define AMDGPU_CTX_WORKLOAD_HINT_VIDEO     (2 << AMDGPU_CTX_WORKLOAD_HINT_SHIFT)
> +#define AMDGPU_CTX_WORKLOAD_HINT_VR        (3 << AMDGPU_CTX_WORKLOAD_HINT_SHIFT)
> +#define AMDGPU_CTX_WORKLOAD_HINT_COMPUTE   (4 << AMDGPU_CTX_WORKLOAD_HINT_SHIFT)
> +#define AMDGPU_CTX_WORKLOAD_HINT_MAX	   AMDGPU_CTX_WORKLOAD_HINT_COMPUTE
> +#define AMDGPU_CTX_WORKLOAD_INDEX(n)	   (n >> AMDGPU_CTX_WORKLOAD_HINT_SHIFT)
> +
>   struct drm_amdgpu_ctx_in {
>   	/** AMDGPU_CTX_OP_* */
>   	__u32	op;
> @@ -281,6 +294,11 @@ union drm_amdgpu_ctx_out {
>   			__u32	flags;
>   			__u32	_pad;
>   		} pstate;
> +
> +		struct {
> +			__u32	flags;
> +			__u32	_pad;
> +		} workload;
>   };
>   
>   union drm_amdgpu_ctx {