On Wed, Jan 15, 2020 at 4:21 AM Evan Quan <evan.quan@xxxxxxx> wrote:
>
> NFO: task ocltst:2028 blocked for more than 120 seconds.
> Tainted: G OE 5.0.0-37-generic #40~18.04.1-Ubuntu
> echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> cltst D 0 2028 2026 0x00000000
> all Trace:
> __schedule+0x2c0/0x870
> schedule+0x2c/0x70
> schedule_preempt_disabled+0xe/0x10
> __mutex_lock.isra.9+0x26d/0x4e0
> __mutex_lock_slowpath+0x13/0x20
> ? __mutex_lock_slowpath+0x13/0x20
> mutex_lock+0x2f/0x40
> amdgpu_dpm_set_powergating_by_smu+0x64/0xe0 [amdgpu]
> gfx_v8_0_enable_gfx_static_mg_power_gating+0x3c/0x70 [amdgpu]
> gfx_v8_0_set_powergating_state+0x66/0x260 [amdgpu]
> amdgpu_device_ip_set_powergating_state+0x62/0xb0 [amdgpu]
> pp_dpm_force_performance_level+0xe7/0x100 [amdgpu]
> amdgpu_set_dpm_forced_performance_level+0x129/0x330 [amdgpu]
>
> This was introduced by "drm/amd/powerplay: cleanup the interfaces for
> powergate setting through SMU".
>
> Change-Id: I6ae2ed89d40a9475ae37b58e22108f4d6da974bb
> Signed-off-by: Evan Quan <evan.quan@xxxxxxx>
> Reported-by: Rui Teng <Rui.Teng@xxxxxxx>
Please add the description of the deadlock from the comment in the
code to the patch description as well. With that fixed:
Acked-by: Alex Deucher <alexander.deucher@xxxxxxx>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_dpm.c | 40 +++++++++++++++----------
> 1 file changed, 25 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_dpm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_dpm.c
> index 6c7dca1da992..19a042cf673c 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_dpm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_dpm.c
> @@ -946,23 +946,36 @@ int amdgpu_dpm_set_powergating_by_smu(struct amdgpu_device *adev, uint32_t block
> bool swsmu = is_support_sw_smu(adev);
>
> switch (block_type) {
> - case AMD_IP_BLOCK_TYPE_GFX:
> case AMD_IP_BLOCK_TYPE_UVD:
> - case AMD_IP_BLOCK_TYPE_VCN:
> case AMD_IP_BLOCK_TYPE_VCE:
> - case AMD_IP_BLOCK_TYPE_SDMA:
> if (swsmu) {
> ret = smu_dpm_set_power_gate(&adev->smu, block_type, gate);
> - } else {
> - if (adev->powerplay.pp_funcs &&
> - adev->powerplay.pp_funcs->set_powergating_by_smu) {
> - mutex_lock(&adev->pm.mutex);
> - ret = ((adev)->powerplay.pp_funcs->set_powergating_by_smu(
> - (adev)->powerplay.pp_handle, block_type, gate));
> - mutex_unlock(&adev->pm.mutex);
> - }
> + } else if (adev->powerplay.pp_funcs &&
> + adev->powerplay.pp_funcs->set_powergating_by_smu) {
> + /*
> + * TODO: need a better lock mechanism
> + *
> + * Here adev->pm.mutex lock protection is enforced on
> + * UVD and VCE cases only. Since for other cases, there
> + * may be already lock protection in amdgpu_pm.c.
> + * This is a quick fix for the deadlock issue.
> + */
> + mutex_lock(&adev->pm.mutex);
> + ret = ((adev)->powerplay.pp_funcs->set_powergating_by_smu(
> + (adev)->powerplay.pp_handle, block_type, gate));
> + mutex_unlock(&adev->pm.mutex);
> }
> break;
> + case AMD_IP_BLOCK_TYPE_GFX:
> + case AMD_IP_BLOCK_TYPE_VCN:
> + case AMD_IP_BLOCK_TYPE_SDMA:
> + if (swsmu)
> + ret = smu_dpm_set_power_gate(&adev->smu, block_type, gate);
> + else if (adev->powerplay.pp_funcs &&
> + adev->powerplay.pp_funcs->set_powergating_by_smu)
> + ret = ((adev)->powerplay.pp_funcs->set_powergating_by_smu(
> + (adev)->powerplay.pp_handle, block_type, gate));
> + break;
> case AMD_IP_BLOCK_TYPE_JPEG:
> if (swsmu)
> ret = smu_dpm_set_power_gate(&adev->smu, block_type, gate);
> @@ -970,12 +983,9 @@ int amdgpu_dpm_set_powergating_by_smu(struct amdgpu_device *adev, uint32_t block
> case AMD_IP_BLOCK_TYPE_GMC:
> case AMD_IP_BLOCK_TYPE_ACP:
> if (adev->powerplay.pp_funcs &&
> - adev->powerplay.pp_funcs->set_powergating_by_smu) {
> - mutex_lock(&adev->pm.mutex);
> + adev->powerplay.pp_funcs->set_powergating_by_smu)
> ret = ((adev)->powerplay.pp_funcs->set_powergating_by_smu(
> (adev)->powerplay.pp_handle, block_type, gate));
> - mutex_unlock(&adev->pm.mutex);
> - }
> break;
> default:
> break;
> --
> 2.24.1
>
> _______________________________________________
> amd-gfx mailing list
> amd-gfx@xxxxxxxxxxxxxxxxxxxxx
> https://lists.freedesktop.org/mailman/listinfo/amd-gfx
_______________________________________________
amd-gfx mailing list
amd-gfx@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/amd-gfx
