drm/amd/powerplay: fix deadlock issue for smu_force_performance_level

the smu->mutex is internal lock resource in sw-smu, some functions will use
it at the same time, so it maybe will cause deadlock issue.
this patch fix this issue in smu_force_performance_level function.

Signed-off-by: Kevin Wang <kevin1.wang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
index d78d9cb..2f4b03b 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
@@ -370,18 +370,9 @@ static ssize_t amdgpu_set_dpm_forced_performance_level(struct device *dev,
        }
 
        if (is_support_sw_smu(adev)) {
-               mutex_lock(&adev->pm.mutex);
-               if (adev->pm.dpm.thermal_active) {
-                       count = -EINVAL;
-                       mutex_unlock(&adev->pm.mutex);
-                       goto fail;
-               }
                ret = smu_force_performance_level(&adev->smu, level);
                if (ret)
                        count = -EINVAL;
-               else
-                       adev->pm.dpm.forced_level = level;
-               mutex_unlock(&adev->pm.mutex);
        } else if (adev->powerplay.pp_funcs->force_performance_level) {
                mutex_lock(&adev->pm.mutex);
                if (adev->pm.dpm.thermal_active) {

diff --git a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
index 41e9a7e..8a554dc 100644 (file)
--- a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
+++ b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
@@ -1459,12 +1459,15 @@ int smu_force_performance_level(struct smu_context *smu, enum amd_dpm_forced_lev
                        break;
        }
 
-       mutex_lock(&smu->mutex);
 
        smu->adev->ip_blocks[i].version->funcs->enable_umd_pstate(smu, &level);
        ret = smu_handle_task(smu, level,
                              AMD_PP_TASK_READJUST_POWER_STATE);
+       if (ret)
+               return ret;
 
+       mutex_lock(&smu->mutex);
+       smu_dpm_ctx->dpm_level = level;
        mutex_unlock(&smu->mutex);
 
        return ret;