linux-kernel - Re: [PATCH v2 4/7] drm/amdgpu: Add suspend function to clear the GPU power profile.

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Message-ID: <6be29845-2f40-f5c0-1a7d-892605ce58df@amd.com>
Date:   Mon, 21 Aug 2023 19:22:11 +0530
From:   "Yadav, Arvind" <arvyadav@....com>
To:     Shashank Sharma <shashank.sharma@....com>,
        Arvind Yadav <Arvind.Yadav@....com>, Christian.Koenig@....com,
        alexander.deucher@....com, Xinhui.Pan@....com, airlied@...il.com,
        daniel@...ll.ch, Felix.Kuehling@....com,
        amd-gfx@...ts.freedesktop.org
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/7] drm/amdgpu: Add suspend function to clear the GPU
 power profile.


On 8/21/2023 7:13 PM, Shashank Sharma wrote:
>
> On 21/08/2023 08:47, Arvind Yadav wrote:
>> This patch adds a suspend function that will clear the GPU
>> power profile before going into suspend state.
>>
>> v2:
>> - Add the new suspend function based on 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_device.c    |  2 ++
>>   drivers/gpu/drm/amd/amdgpu/amdgpu_workload.c  | 23 +++++++++++++++++++
>>   drivers/gpu/drm/amd/include/amdgpu_workload.h |  2 ++
>>   3 files changed, 27 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c 
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>> index cd3bf641b630..3b70e657b439 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>> @@ -4212,6 +4212,8 @@ int amdgpu_device_suspend(struct drm_device 
>> *dev, bool fbcon)
>>         amdgpu_ras_suspend(adev);
>>   +    amdgpu_workload_profile_suspend(adev);
>> +
>>       amdgpu_device_ip_suspend_phase1(adev);
>>         if (!adev->in_s0ix)
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_workload.c 
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_workload.c
>> index 6367eb88a44d..44ca8e986984 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_workload.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_workload.c
>> @@ -174,6 +174,29 @@ void amdgpu_workload_profile_set(struct 
>> amdgpu_device *adev,
>>       mutex_unlock(&workload->workload_lock);
>>   }
>>   +void amdgpu_workload_profile_suspend(struct amdgpu_device *adev)
>> +{
>> +    struct amdgpu_smu_workload *workload = &adev->smu_workload;
>> +    int ret;
>> +
>> +    mutex_lock(&workload->workload_lock);
>> + cancel_delayed_work_sync(&workload->smu_delayed_work);
>> +
>> +    /* Clear all the set GPU power profile*/
>> +    for (int index = fls(workload->submit_workload_status);
>> +         index > 0; index--) {
>> +        if (workload->submit_workload_status & (1 << index)) {
>> + atomic_set(&workload->power_profile_ref[index], 0);
>> +            ret = amdgpu_power_profile_clear(adev, index);
>
> Why do we need the checks here ? can't we simply set call 
> power_profile_clear() for all profiles ?

Hi Shashank,

  If we use only one profile then why to clear others. But I can remove 
the check and clear for all the profiles as per your suggestion.

ThankYou,
~Arvind
>
> - Shashank
>
>> +            if (ret)
>> +                DRM_WARN("Failed to clear power profile %s, err = 
>> %d\n",
>> +                     amdgpu_workload_mode_name[index], ret);
>> +        }
>> +    }
>
>
>> +    workload->submit_workload_status = 0;
>> +    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 ee1f87257f2d..0acd8769ec52 100644
>> --- a/drivers/gpu/drm/amd/include/amdgpu_workload.h
>> +++ b/drivers/gpu/drm/amd/include/amdgpu_workload.h
>> @@ -52,6 +52,8 @@ void amdgpu_workload_profile_put(struct 
>> amdgpu_device *adev,
>>   void amdgpu_workload_profile_set(struct amdgpu_device *adev,
>>                    uint32_t ring_type);
>>   +void amdgpu_workload_profile_suspend(struct amdgpu_device *adev);
>> +
>>   void amdgpu_workload_profile_init(struct amdgpu_device *adev);
>>     void amdgpu_workload_profile_fini(struct amdgpu_device *adev);