On 3/11/2025 7:47 PM, Alex Deucher wrote:
> Only increment the power profile on the first submission.
> Since the decrement may end up being pushed out as new
> submissions come in, we only need to increment it once.
>
> Fixes: 1443dd3c67f6 ("drm/amd/pm: fix and simplify workload handling”)
> Cc: Yang Wang <kevinyang.wang@xxxxxxx>
> Cc: Kenneth Feng <kenneth.feng@xxxxxxx>
> Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c | 28 ++++++++++++++++++-------
> 1 file changed, 21 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
> index 984e6ff6e4632..90396aa8ec9f6 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
> @@ -2142,12 +2142,25 @@ void amdgpu_gfx_enforce_isolation_ring_end_use(struct amdgpu_ring *ring)
> amdgpu_gfx_kfd_sch_ctrl(adev, idx, true);
> }
>
> +static unsigned int
> +amdgpu_gfx_get_kernel_ring_fence_counts(struct amdgpu_device *adev)
> +{
> + unsigned int i, fences = 0;
> +
> + for (i = 0; i < AMDGPU_MAX_GFX_RINGS; ++i)
> + fences += amdgpu_fence_count_emitted(&adev->gfx.gfx_ring[i]);
> + for (i = 0; i < (AMDGPU_MAX_COMPUTE_RINGS * AMDGPU_MAX_GC_INSTANCES); ++i)
> + fences += amdgpu_fence_count_emitted(&adev->gfx.compute_ring[i]);
> +
> + return fences;
> +}
> +
> void amdgpu_gfx_profile_idle_work_handler(struct work_struct *work)
> {
> struct amdgpu_device *adev =
> container_of(work, struct amdgpu_device, gfx.idle_work.work);
> enum PP_SMC_POWER_PROFILE profile;
> - u32 i, fences = 0;
> + unsigned int fences = 0;
> int r;
>
> if (adev->gfx.num_gfx_rings)
> @@ -2155,10 +2168,8 @@ void amdgpu_gfx_profile_idle_work_handler(struct work_struct *work)
> else
> profile = PP_SMC_POWER_PROFILE_COMPUTE;
>
> - for (i = 0; i < AMDGPU_MAX_GFX_RINGS; ++i)
> - fences += amdgpu_fence_count_emitted(&adev->gfx.gfx_ring[i]);
> - for (i = 0; i < (AMDGPU_MAX_COMPUTE_RINGS * AMDGPU_MAX_GC_INSTANCES); ++i)
> - fences += amdgpu_fence_count_emitted(&adev->gfx.compute_ring[i]);
> + fences = amdgpu_gfx_get_kernel_ring_fence_counts(adev);
> +
> if (!fences && !atomic_read(&adev->gfx.total_submission_cnt)) {
> r = amdgpu_dpm_switch_power_profile(adev, profile, false);
> if (r)
> @@ -2174,6 +2185,7 @@ void amdgpu_gfx_profile_ring_begin_use(struct amdgpu_ring *ring)
> {
> struct amdgpu_device *adev = ring->adev;
> enum PP_SMC_POWER_PROFILE profile;
> + unsigned int fences = 0;
> int r;
>
> if (adev->gfx.num_gfx_rings)
> @@ -2181,15 +2193,17 @@ void amdgpu_gfx_profile_ring_begin_use(struct amdgpu_ring *ring)
> else
> profile = PP_SMC_POWER_PROFILE_COMPUTE;
>
> - atomic_inc(&adev->gfx.total_submission_cnt);
> + fences = amdgpu_gfx_get_kernel_ring_fence_counts(adev);
>
> - if (!cancel_delayed_work_sync(&adev->gfx.idle_work)) {
> + if (!cancel_delayed_work_sync(&adev->gfx.idle_work) && !fences &&
> + !atomic_read(&adev->gfx.total_submission_cnt)) {
Should this check be restricted to !fences &&
!atomic_read(&adev->gfx.total_submission_cnt). If the work has already
started execution, cancel_delayed_work_sync will wait for completion and
will return true. In that case, it could happen that idle work would
have already called amdgpu_dpm_switch_power_profile(adev, profile,
false) since submission count increment is moved down.
Wondering if this needs to be split like below -
1) cancel_delayed_work_sync(&adev->gfx.idle_work);
2) Take fence/submission count
3) if (!fences && !atomic_read(&adev->gfx.total_submission_cnt)
Thanks,
Lijo
> 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");
> }
> + atomic_inc(&adev->gfx.total_submission_cnt);
> }
>
> void amdgpu_gfx_profile_ring_end_use(struct amdgpu_ring *ring)
