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

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Date:   Mon, 21 Aug 2023 23:38:00 +0530
From:   "Yadav, Arvind" <arvyadav@....com>
To:     Alex Deucher <alexdeucher@...il.com>,
        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 8/21/2023 11:36 PM, Alex Deucher wrote:
> 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?
Noted.
>
> 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
>>