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

["Yadav, Arvind" <arvyadav@xxxxxxx>]

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@xxxxxxx>
> > Cc: Christian Koenig <christian.koenig@xxxxxxx>
> > Cc: Alex Deucher <alexander.deucher@xxxxxxx>
> > Signed-off-by: Arvind Yadav <Arvind.Yadav@xxxxxxx>
> > ---
> >   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);