linux-kernel - Re: [PATCH v2 2/7] drm/amdgpu: Add new function to set GPU power profile

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Message-ID: <CADnq5_PreqOHyhF2v5FxViJcBO2RKjEjCCE2_RoYXoD66TX4eA@mail.gmail.com>
Date:   Mon, 21 Aug 2023 14:06:24 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     Arvind Yadav <Arvind.Yadav@....com>
Cc:     Christian.Koenig@....com, alexander.deucher@....com,
        shashank.sharma@....com, Xinhui.Pan@....com, airlied@...il.com,
        daniel@...ll.ch, Felix.Kuehling@....com,
        amd-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v2 2/7] drm/amdgpu: Add new function to set GPU power profile

On Mon, Aug 21, 2023 at 2:55 AM Arvind Yadav <Arvind.Yadav@....com> wrote:
>
> This patch adds a function which will change the GPU
> power profile based on a submitted job. This can optimize
> the power performance when the workload is on.
>
> v2:
> - Splitting workload_profile_set and workload_profile_put
>   into two separate patches.
> - Addressed review comment.
>
> Cc: Shashank Sharma <shashank.sharma@....com>
> Cc: Christian Koenig <christian.koenig@....com>
> Cc: Alex Deucher <alexander.deucher@....com>
> Signed-off-by: Arvind Yadav <Arvind.Yadav@....com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_workload.c  | 56 +++++++++++++++++++
>  drivers/gpu/drm/amd/include/amdgpu_workload.h |  3 +
>  2 files changed, 59 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_workload.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_workload.c
> index 32166f482f77..e661cc5b3d92 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_workload.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_workload.c
> @@ -24,6 +24,62 @@
>
>  #include "amdgpu.h"
>
> +static enum PP_SMC_POWER_PROFILE
> +ring_to_power_profile(uint32_t ring_type)
> +{
> +       switch (ring_type) {
> +       case AMDGPU_RING_TYPE_GFX:
> +               return PP_SMC_POWER_PROFILE_FULLSCREEN3D;
> +       case AMDGPU_RING_TYPE_COMPUTE:
> +               return PP_SMC_POWER_PROFILE_COMPUTE;
> +       case AMDGPU_RING_TYPE_UVD:
> +       case AMDGPU_RING_TYPE_VCE:
> +       case AMDGPU_RING_TYPE_UVD_ENC:
> +       case AMDGPU_RING_TYPE_VCN_DEC:
> +       case AMDGPU_RING_TYPE_VCN_ENC:
> +       case AMDGPU_RING_TYPE_VCN_JPEG:
> +               return PP_SMC_POWER_PROFILE_VIDEO;
> +       default:
> +               return PP_SMC_POWER_PROFILE_BOOTUP_DEFAULT;
> +       }
> +}
> +
> +static int
> +amdgpu_power_profile_set(struct amdgpu_device *adev,
> +                        enum PP_SMC_POWER_PROFILE profile)
> +{
> +       int ret = amdgpu_dpm_switch_power_profile(adev, profile, true);
> +
> +       if (!ret) {
> +               /* Set the bit for the submitted workload profile */
> +               adev->smu_workload.submit_workload_status |= (1 << profile);
> +               atomic_inc(&adev->smu_workload.power_profile_ref[profile]);
> +       }
> +
> +       return ret;
> +}
> +
> +void amdgpu_workload_profile_set(struct amdgpu_device *adev,
> +                                uint32_t ring_type)

Maybe rename this amdgpu_workload_profile_get() to align with put/get
naming semantics?

Alex

> +{
> +       struct amdgpu_smu_workload *workload = &adev->smu_workload;
> +       enum PP_SMC_POWER_PROFILE profile = ring_to_power_profile(ring_type);
> +       int ret;
> +
> +       if (profile == PP_SMC_POWER_PROFILE_BOOTUP_DEFAULT)
> +               return;
> +
> +       mutex_lock(&workload->workload_lock);
> +
> +       ret = amdgpu_power_profile_set(adev, profile);
> +       if (ret) {
> +               DRM_WARN("Failed to set workload profile to %s, error = %d\n",
> +                        amdgpu_workload_mode_name[profile], ret);
> +       }
> +
> +       mutex_unlock(&workload->workload_lock);
> +}
> +
>  void amdgpu_workload_profile_init(struct amdgpu_device *adev)
>  {
>         adev->smu_workload.adev = adev;
> diff --git a/drivers/gpu/drm/amd/include/amdgpu_workload.h b/drivers/gpu/drm/amd/include/amdgpu_workload.h
> index 5d0f068422d4..5022f28fc2f9 100644
> --- a/drivers/gpu/drm/amd/include/amdgpu_workload.h
> +++ b/drivers/gpu/drm/amd/include/amdgpu_workload.h
> @@ -46,6 +46,9 @@ static const char * const amdgpu_workload_mode_name[] = {
>         "Window3D"
>  };
>
> +void amdgpu_workload_profile_set(struct amdgpu_device *adev,
> +                                uint32_t ring_type);
> +
>  void amdgpu_workload_profile_init(struct amdgpu_device *adev);
>
>  void amdgpu_workload_profile_fini(struct amdgpu_device *adev);
> --
> 2.34.1
>