On 3/14/2025 7:17 PM, Alex Deucher wrote:
> No need to make the workload profile setup dependent
> on the results of cancelling the delayed work thread.
> We have all of the necessary checking in place for the
> workload profile reference counting, so separate the
> two. As it is now, we can theoretically end up with
> the call from begin_use happening while the worker
> thread is executing which would result in the profile
> not getting set for that submission. It should not
> affect the reference counting.
>
> Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c | 22 +++++++++++-----------
> 1 file changed, 11 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
> index 099329d15b9ff..20424f8c4925f 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
> @@ -2188,18 +2188,18 @@ void amdgpu_gfx_profile_ring_begin_use(struct amdgpu_ring *ring)
>
> atomic_inc(&adev->gfx.total_submission_cnt);
>
> - if (!cancel_delayed_work_sync(&adev->gfx.idle_work)) {
> - mutex_lock(&adev->gfx.workload_profile_mutex);
> - if (!adev->gfx.workload_profile_active) {
> - r = amdgpu_dpm_switch_power_profile(adev, profile, true);
> - if (r)
> - dev_warn(adev->dev, "(%d) failed to disable %s power profile mode\n", r,
> - profile == PP_SMC_POWER_PROFILE_FULLSCREEN3D ?
> - "fullscreen 3D" : "compute");
> - adev->gfx.workload_profile_active = true;
> - }
> - mutex_unlock(&adev->gfx.workload_profile_mutex);
> + cancel_delayed_work_sync(&adev->gfx.idle_work);
> +
To avoid locking/unlocking mutex for each begin_use, I think here we
could do like
if (adev->gfx.workload_profile_active)
return;
Thanks,
Lijo
> + mutex_lock(&adev->gfx.workload_profile_mutex);
> + if (!adev->gfx.workload_profile_active) {
> + r = amdgpu_dpm_switch_power_profile(adev, profile, true);
> + if (r)
> + dev_warn(adev->dev, "(%d) failed to disable %s power profile mode\n", r,
> + profile == PP_SMC_POWER_PROFILE_FULLSCREEN3D ?
> + "fullscreen 3D" : "compute");
> + adev->gfx.workload_profile_active = true;
> }
> + mutex_unlock(&adev->gfx.workload_profile_mutex);
> }
>
> void amdgpu_gfx_profile_ring_end_use(struct amdgpu_ring *ring)
