Re: [PATCH v3 1/5] drm/amdgpu: add UAPI for workload hints to ctx ioctl

["Christian König" <ckoenig.leichtzumerken@gmail.com>]

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Yes, I would like to avoid having multiple code paths for context creation.

Setting it later on should be equally to specifying it on creation since 
we only need it during CS.

Regards,
Christian.

Am 21.03.23 um 14:00 schrieb Sharma, Shashank:
>
> [AMD Official Use Only - General]
>
> When we started this patch series, the workload hint was a part of the 
> ctx_flag only,
>
> But we changed that after the design review, to make it more like how 
> we are handling PSTATE.
>
> Details:
>
> https://patchwork.freedesktop.org/patch/496111/
>
> Regards
>
> Shashank
>
> *From:*Marek Olšák <maraeo@gmail.com>
> *Sent:* 21 March 2023 04:05
> *To:* Sharma, Shashank <Shashank.Sharma@amd.com>
> *Cc:* amd-gfx@lists.freedesktop.org; Deucher, Alexander 
> <Alexander.Deucher@amd.com>; Somalapuram, Amaranath 
> <Amaranath.Somalapuram@amd.com>; Koenig, Christian 
> <Christian.Koenig@amd.com>
> *Subject:* Re: [PATCH v3 1/5] drm/amdgpu: add UAPI for workload hints 
> to ctx ioctl
>
> I think we should do it differently because this interface will be 
> mostly unused by open source userspace in its current form.
>
> Let's set the workload hint in drm_amdgpu_ctx_in::flags, and that will 
> be immutable for the lifetime of the context. No other interface is 
> needed.
>
> Marek
>
> On Mon, Sep 26, 2022 at 5:41 PM Shashank Sharma 
> <shashank.sharma@amd.com> wrote:
>
>     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.
>
>     V3: Create only set() workload UAPI (Christian)
>
>     Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
>     Signed-off-by: Shashank Sharma <shashank.sharma@amd.com>
>     ---
>      include/uapi/drm/amdgpu_drm.h | 17 +++++++++++++++++
>      1 file changed, 17 insertions(+)
>
>     diff --git a/include/uapi/drm/amdgpu_drm.h
>     b/include/uapi/drm/amdgpu_drm.h
>     index c2c9c674a223..23d354242699 100644
>     --- a/include/uapi/drm/amdgpu_drm.h
>     +++ b/include/uapi/drm/amdgpu_drm.h
>     @@ -212,6 +212,7 @@ 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_SET_WORKLOAD_PROFILE     7
>
>      /* GPU reset status */
>      #define AMDGPU_CTX_NO_RESET            0
>     @@ -252,6 +253,17 @@ 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 +293,11 @@ union drm_amdgpu_ctx_out {
>                             __u32   flags;
>                             __u32   _pad;
>                     } pstate;
>     +
>     +               struct {
>     +                       __u32   flags;
>     +                       __u32   _pad;
>     +               } workload;
>      };
>
>      union drm_amdgpu_ctx {
>     -- 
>     2.34.1
>

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