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drm/amd/powerplay: a quick fix for the deadlock issue below 

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]

Fixes: a64c9e15e6 ("drm/amd/powerplay: cleanup the interfaces for powergate setting through SMU")
Signed-off-by: Evan Quan <evan.quan@amd.com>
Reported-by: Rui Teng <Rui.Teng@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Evan Quan 2020-01-15 17:07:21 +08:00 коммит произвёл Alex Deucher
Родитель 0e5b7a9528
Коммит 2ac0d68697
1 изменённых файлов: 43 добавлений и 15 удалений
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58
drivers/gpu/drm/amd/amdgpu/amdgpu_dpm.c
Просмотреть файл

@ -946,23 +946,54 @@ 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 below.
* 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]
*/
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 +1001,9 @@ 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;