drm/amd/powerplay: use work queue to perform throttling logging

As IO operations(access to SMU internals) and possible sleep are
involved in throttling logging. Workqueue can handle them well.
Otherwise we may hit "scheduling while atomic" error.
Signed-off-by: Evan Quan <evan.quan@amd.com>
Acked-by: Nirmoy Das <nirmoy.das@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/amdgpu_smu.c

@@ -1034,6 +1034,14 @@ static int smu_smc_table_sw_fini(struct smu_context *smu)
 	return 0;
 }
 
+static void smu_throttling_logging_work_fn(struct work_struct *work)
+{
+	struct smu_context *smu = container_of(work, struct smu_context,
+					       throttling_logging_work);
+
+	smu_log_thermal_throttling(smu);
+}
+
 static int smu_sw_init(void *handle)
 {
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
@@ -1055,6 +1063,7 @@ static int smu_sw_init(void *handle)
 	mutex_init(&smu->metrics_lock);
 	mutex_init(&smu->message_lock);
 
+	INIT_WORK(&smu->throttling_logging_work, smu_throttling_logging_work_fn);
 	smu->watermarks_bitmap = 0;
 	smu->power_profile_mode = PP_SMC_POWER_PROFILE_BOOTUP_DEFAULT;
 	smu->default_power_profile_mode = PP_SMC_POWER_PROFILE_BOOTUP_DEFAULT;
@@ -1372,6 +1381,8 @@ static int smu_smc_hw_cleanup(struct smu_context *smu)
 
 	smu_i2c_eeprom_fini(smu, &adev->pm.smu_i2c);
 
+	cancel_work_sync(&smu->throttling_logging_work);
+
 	ret = smu_disable_thermal_alert(smu);
 	if (ret) {
 		pr_warn("Fail to stop thermal control!\n");

drivers/gpu/drm/amd/powerplay/inc/amdgpu_smu.h

@@ -411,6 +411,8 @@ struct smu_context
 
 	bool uploading_custom_pp_table;
 	bool dc_controlled_by_gpio;
+
+	struct work_struct throttling_logging_work;
 };
 
 struct i2c_adapter;

drivers/gpu/drm/amd/powerplay/smu_v11_0.c

@@ -1605,7 +1605,7 @@ static int smu_v11_0_irq_process(struct amdgpu_device *adev,
 					return 0;
 
 				if (__ratelimit(&adev->throttling_logging_rs))
-					smu_log_thermal_throttling(smu);
+					schedule_work(&smu->throttling_logging_work);
 
 				break;
 			}