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

["Lazar, Lijo" <lijo.lazar@amd.com>]

On 8/21/2023 12:17 PM, 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@amd.com>
> Cc: Christian Koenig <christian.koenig@amd.com>
> Cc: Alex Deucher <alexander.deucher@amd.com>
> Signed-off-by: Arvind Yadav <Arvind.Yadav@amd.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);

Another deadlock candidate. Between fini() and suspend(), the only 
difference probably could be initialization status. If so, just use a 
helper that is used during fini() and suspend().

Thanks,
Lijo

> +
> +	/* 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);
> +			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);