drm/amd/pm: unified lock protections in amdgpu_dpm.c

As the only entry point, it's now safe and reasonable to
enforce the lock protections in amdgpu_dpm.c. And with
this, we can drop other internal used power locks.
Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/pm/legacy-dpm/kv_dpm.c

@@ -3040,21 +3040,18 @@ static int kv_dpm_sw_init(void *handle)
 		return 0;
 
 	INIT_WORK(&adev->pm.dpm.thermal.work, amdgpu_dpm_thermal_work_handler);
-	mutex_lock(&adev->pm.mutex);
 	ret = kv_dpm_init(adev);
 	if (ret)
 		goto dpm_failed;
 	adev->pm.dpm.current_ps = adev->pm.dpm.requested_ps = adev->pm.dpm.boot_ps;
 	if (amdgpu_dpm == 1)
 		amdgpu_pm_print_power_states(adev);
-	mutex_unlock(&adev->pm.mutex);
 	DRM_INFO("amdgpu: dpm initialized\n");
 
 	return 0;
 
 dpm_failed:
 	kv_dpm_fini(adev);
-	mutex_unlock(&adev->pm.mutex);
 	DRM_ERROR("amdgpu: dpm initialization failed\n");
 	return ret;
 }
@@ -3065,9 +3062,7 @@ static int kv_dpm_sw_fini(void *handle)
 
 	flush_work(&adev->pm.dpm.thermal.work);
 
-	mutex_lock(&adev->pm.mutex);
 	kv_dpm_fini(adev);
-	mutex_unlock(&adev->pm.mutex);
 
 	return 0;
 }
@@ -3080,14 +3075,12 @@ static int kv_dpm_hw_init(void *handle)
 	if (!amdgpu_dpm)
 		return 0;
 
-	mutex_lock(&adev->pm.mutex);
 	kv_dpm_setup_asic(adev);
 	ret = kv_dpm_enable(adev);
 	if (ret)
 		adev->pm.dpm_enabled = false;
 	else
 		adev->pm.dpm_enabled = true;
-	mutex_unlock(&adev->pm.mutex);
 	amdgpu_legacy_dpm_compute_clocks(adev);
 	return ret;
 }
@@ -3096,11 +3089,8 @@ static int kv_dpm_hw_fini(void *handle)
 {
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 
-	if (adev->pm.dpm_enabled) {
-		mutex_lock(&adev->pm.mutex);
+	if (adev->pm.dpm_enabled)
 		kv_dpm_disable(adev);
-		mutex_unlock(&adev->pm.mutex);
-	}
 
 	return 0;
 }
@@ -3110,12 +3100,10 @@ static int kv_dpm_suspend(void *handle)
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 
 	if (adev->pm.dpm_enabled) {
-		mutex_lock(&adev->pm.mutex);
 		/* disable dpm */
 		kv_dpm_disable(adev);
 		/* reset the power state */
 		adev->pm.dpm.current_ps = adev->pm.dpm.requested_ps = adev->pm.dpm.boot_ps;
-		mutex_unlock(&adev->pm.mutex);
 	}
 	return 0;
 }
@@ -3127,14 +3115,12 @@ static int kv_dpm_resume(void *handle)
 
 	if (adev->pm.dpm_enabled) {
 		/* asic init will reset to the boot state */
-		mutex_lock(&adev->pm.mutex);
 		kv_dpm_setup_asic(adev);
 		ret = kv_dpm_enable(adev);
 		if (ret)
 			adev->pm.dpm_enabled = false;
 		else
 			adev->pm.dpm_enabled = true;
-		mutex_unlock(&adev->pm.mutex);
 		if (adev->pm.dpm_enabled)
 			amdgpu_legacy_dpm_compute_clocks(adev);
 	}

drivers/gpu/drm/amd/pm/legacy-dpm/si_dpm.c

@@ -7786,21 +7786,18 @@ static int si_dpm_sw_init(void *handle)
 		return ret;
 
 	INIT_WORK(&adev->pm.dpm.thermal.work, amdgpu_dpm_thermal_work_handler);
-	mutex_lock(&adev->pm.mutex);
 	ret = si_dpm_init(adev);
 	if (ret)
 		goto dpm_failed;
 	adev->pm.dpm.current_ps = adev->pm.dpm.requested_ps = adev->pm.dpm.boot_ps;
 	if (amdgpu_dpm == 1)
 		amdgpu_pm_print_power_states(adev);
-	mutex_unlock(&adev->pm.mutex);
 	DRM_INFO("amdgpu: dpm initialized\n");
 
 	return 0;
 
 dpm_failed:
 	si_dpm_fini(adev);
-	mutex_unlock(&adev->pm.mutex);
 	DRM_ERROR("amdgpu: dpm initialization failed\n");
 	return ret;
 }
@@ -7811,9 +7808,7 @@ static int si_dpm_sw_fini(void *handle)
 
 	flush_work(&adev->pm.dpm.thermal.work);
 
-	mutex_lock(&adev->pm.mutex);
 	si_dpm_fini(adev);
-	mutex_unlock(&adev->pm.mutex);
 
 	return 0;
 }
@@ -7827,14 +7822,12 @@ static int si_dpm_hw_init(void *handle)
 	if (!amdgpu_dpm)
 		return 0;
 
-	mutex_lock(&adev->pm.mutex);
 	si_dpm_setup_asic(adev);
 	ret = si_dpm_enable(adev);
 	if (ret)
 		adev->pm.dpm_enabled = false;
 	else
 		adev->pm.dpm_enabled = true;
-	mutex_unlock(&adev->pm.mutex);
 	amdgpu_legacy_dpm_compute_clocks(adev);
 	return ret;
 }
@@ -7843,11 +7836,8 @@ static int si_dpm_hw_fini(void *handle)
 {
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 
-	if (adev->pm.dpm_enabled) {
-		mutex_lock(&adev->pm.mutex);
+	if (adev->pm.dpm_enabled)
 		si_dpm_disable(adev);
-		mutex_unlock(&adev->pm.mutex);
-	}
 
 	return 0;
 }
@@ -7857,12 +7847,10 @@ static int si_dpm_suspend(void *handle)
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 
 	if (adev->pm.dpm_enabled) {
-		mutex_lock(&adev->pm.mutex);
 		/* disable dpm */
 		si_dpm_disable(adev);
 		/* reset the power state */
 		adev->pm.dpm.current_ps = adev->pm.dpm.requested_ps = adev->pm.dpm.boot_ps;
-		mutex_unlock(&adev->pm.mutex);
 	}
 	return 0;
 }
@@ -7874,14 +7862,12 @@ static int si_dpm_resume(void *handle)
 
 	if (adev->pm.dpm_enabled) {
 		/* asic init will reset to the boot state */
-		mutex_lock(&adev->pm.mutex);
 		si_dpm_setup_asic(adev);
 		ret = si_dpm_enable(adev);
 		if (ret)
 			adev->pm.dpm_enabled = false;
 		else
 			adev->pm.dpm_enabled = true;
-		mutex_unlock(&adev->pm.mutex);
 		if (adev->pm.dpm_enabled)
 			amdgpu_legacy_dpm_compute_clocks(adev);
 	}