From: Michel Dänzer mdaenzer@redhat.com
commit 32bc8f8373d2d6a681c96e4b25dca60d4d1c6016 upstream.
schedule_delayed_work does not push back the work if it was already scheduled before, so amdgpu_device_delay_enable_gfx_off ran ~100 ms after the first time GFXOFF was disabled and re-enabled, even if GFXOFF was disabled and re-enabled again during those 100 ms.
This resulted in frame drops / stutter with the upcoming mutter 41 release on Navi 14, due to constantly enabling GFXOFF in the HW and disabling it again (for getting the GPU clock counter).
To fix this, call cancel_delayed_work_sync when the disable count transitions from 0 to 1, and only schedule the delayed work on the reverse transition, not if the disable count was already 0. This makes sure the delayed work doesn't run at unexpected times, and allows it to be lock-free.
v2: * Use cancel_delayed_work_sync & mutex_trylock instead of mod_delayed_work. v3: * Make amdgpu_device_delay_enable_gfx_off lock-free (Christian König) v4: * Fix race condition between amdgpu_gfx_off_ctrl incrementing adev->gfx.gfx_off_req_count and amdgpu_device_delay_enable_gfx_off checking for it to be 0 (Evan Quan)
Cc: stable@vger.kernel.org Reviewed-by: Evan Quan evan.quan@amd.com Reviewed-by: Lijo Lazar lijo.lazar@amd.com # v3 Acked-by: Christian König christian.koenig@amd.com # v3 Signed-off-by: Michel Dänzer mdaenzer@redhat.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 11 +++----- drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c | 38 +++++++++++++++++++---------- 2 files changed, 31 insertions(+), 18 deletions(-)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c @@ -2619,12 +2619,11 @@ static void amdgpu_device_delay_enable_g struct amdgpu_device *adev = container_of(work, struct amdgpu_device, gfx.gfx_off_delay_work.work);
- mutex_lock(&adev->gfx.gfx_off_mutex); - if (!adev->gfx.gfx_off_state && !adev->gfx.gfx_off_req_count) { - if (!amdgpu_dpm_set_powergating_by_smu(adev, AMD_IP_BLOCK_TYPE_GFX, true)) - adev->gfx.gfx_off_state = true; - } - mutex_unlock(&adev->gfx.gfx_off_mutex); + WARN_ON_ONCE(adev->gfx.gfx_off_state); + WARN_ON_ONCE(adev->gfx.gfx_off_req_count); + + if (!amdgpu_dpm_set_powergating_by_smu(adev, AMD_IP_BLOCK_TYPE_GFX, true)) + adev->gfx.gfx_off_state = true; }
/** --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c @@ -556,24 +556,38 @@ void amdgpu_gfx_off_ctrl(struct amdgpu_d
mutex_lock(&adev->gfx.gfx_off_mutex);
- if (!enable) - adev->gfx.gfx_off_req_count++; - else if (adev->gfx.gfx_off_req_count > 0) + if (enable) { + /* If the count is already 0, it means there's an imbalance bug somewhere. + * Note that the bug may be in a different caller than the one which triggers the + * WARN_ON_ONCE. + */ + if (WARN_ON_ONCE(adev->gfx.gfx_off_req_count == 0)) + goto unlock; + adev->gfx.gfx_off_req_count--;
- if (enable && !adev->gfx.gfx_off_state && !adev->gfx.gfx_off_req_count) { - schedule_delayed_work(&adev->gfx.gfx_off_delay_work, GFX_OFF_DELAY_ENABLE); - } else if (!enable && adev->gfx.gfx_off_state) { - if (!amdgpu_dpm_set_powergating_by_smu(adev, AMD_IP_BLOCK_TYPE_GFX, false)) { - adev->gfx.gfx_off_state = false; - - if (adev->gfx.funcs->init_spm_golden) { - dev_dbg(adev->dev, "GFXOFF is disabled, re-init SPM golden settings\n"); - amdgpu_gfx_init_spm_golden(adev); + if (adev->gfx.gfx_off_req_count == 0 && !adev->gfx.gfx_off_state) + schedule_delayed_work(&adev->gfx.gfx_off_delay_work, GFX_OFF_DELAY_ENABLE); + } else { + if (adev->gfx.gfx_off_req_count == 0) { + cancel_delayed_work_sync(&adev->gfx.gfx_off_delay_work); + + if (adev->gfx.gfx_off_state && + !amdgpu_dpm_set_powergating_by_smu(adev, AMD_IP_BLOCK_TYPE_GFX, false)) { + adev->gfx.gfx_off_state = false; + + if (adev->gfx.funcs->init_spm_golden) { + dev_dbg(adev->dev, + "GFXOFF is disabled, re-init SPM golden settings\n"); + amdgpu_gfx_init_spm_golden(adev); + } } } + + adev->gfx.gfx_off_req_count++; }
+unlock: mutex_unlock(&adev->gfx.gfx_off_mutex); }