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

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Date:   Tue, 22 Aug 2023 18:10:23 +0530
From:   "Yadav, Arvind" <arvyadav@....com>
To:     "Lazar, Lijo" <lijo.lazar@....com>,
        Arvind Yadav <Arvind.Yadav@....com>, 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
Cc:     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 8/22/2023 11:55 AM, Lazar, Lijo wrote:
>
>
> On 8/21/2023 12:17 PM, Arvind Yadav 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);
>> +
>
> You don't need to interact with FW for every set() call. Only send the 
> message if workload_status doesn't have the profile set or refcount is 
> zero. Otherwise, only need to increment the refcount.
Noted.
Thank You,
~Arvind
>
> Thanks,
> Lijo
>
>> +    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)
>> +{
>> +    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);