drm/amd/powerplay: enable gpu_busy_percent sys interface for renoir (v2)

To get the value of gpu_busy_percent, it needs to realize
get_current_activity_percent and get_metrics_table.
The framework of renoir smu is different from old ones like raven. It
needs to realize get_current_activity_percent and get_metrics_table in
renoir_ppt.c like navi10.

v2: remove unused variable (Alex)
Signed-off-by: changzhu <Changfeng.Zhu@amd.com>
Reviewed-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/inc/smu_v12_0.h

@@ -62,6 +62,10 @@ int smu_v12_0_powergate_jpeg(struct smu_context *smu, bool gate);
 
 int smu_v12_0_set_gfx_cgpg(struct smu_context *smu, bool enable);
 
+int smu_v12_0_read_sensor(struct smu_context *smu,
+			  enum amd_pp_sensors sensor,
+			  void *data, uint32_t *size);
+
 uint32_t smu_v12_0_get_gfxoff_status(struct smu_context *smu);
 
 int smu_v12_0_gfx_off_control(struct smu_context *smu, bool enable);

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

@@ -139,6 +139,27 @@ static int renoir_get_smu_table_index(struct smu_context *smc, uint32_t index)
 	return mapping.map_to;
 }
 
+static int renoir_get_metrics_table(struct smu_context *smu,
+				    SmuMetrics_t *metrics_table)
+{
+	struct smu_table_context *smu_table= &smu->smu_table;
+	int ret = 0;
+
+	if (!smu_table->metrics_time || time_after(jiffies, smu_table->metrics_time + msecs_to_jiffies(100))) {
+		ret = smu_update_table(smu, SMU_TABLE_SMU_METRICS, 0,
+				(void *)smu_table->metrics_table, false);
+		if (ret) {
+			pr_info("Failed to export SMU metrics table!\n");
+			return ret;
+		}
+		smu_table->metrics_time = jiffies;
+	}
+
+	memcpy(metrics_table, smu_table->metrics_table, sizeof(SmuMetrics_t));
+
+	return ret;
+}
+
 static int renoir_tables_init(struct smu_context *smu, struct smu_table *tables)
 {
 	struct smu_table_context *smu_table = &smu->smu_table;
@@ -154,6 +175,11 @@ static int renoir_tables_init(struct smu_context *smu, struct smu_table *tables)
 	if (!smu_table->clocks_table)
 		return -ENOMEM;
 
+	smu_table->metrics_table = kzalloc(sizeof(SmuMetrics_t), GFP_KERNEL);
+	if (!smu_table->metrics_table)
+		return -ENOMEM;
+	smu_table->metrics_time = 0;
+
 	return 0;
 }
 
@@ -386,6 +412,32 @@ static int renoir_unforce_dpm_levels(struct smu_context *smu) {
 	return ret;
 }
 
+static int renoir_get_current_activity_percent(struct smu_context *smu,
+					       enum amd_pp_sensors sensor,
+					       uint32_t *value)
+{
+	int ret = 0;
+	SmuMetrics_t metrics;
+
+	if (!value)
+		return -EINVAL;
+
+	ret = renoir_get_metrics_table(smu, &metrics);
+	if (ret)
+		return ret;
+
+	switch (sensor) {
+	case AMDGPU_PP_SENSOR_GPU_LOAD:
+		*value = metrics.AverageGfxActivity;
+		break;
+	default:
+		pr_err("Invalid sensor for retrieving clock activity\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static int renoir_get_workload_type(struct smu_context *smu, uint32_t profile)
 {
 
@@ -699,6 +751,29 @@ static int renoir_get_power_profile_mode(struct smu_context *smu,
 	return size;
 }
 
+static int renoir_read_sensor(struct smu_context *smu,
+				 enum amd_pp_sensors sensor,
+				 void *data, uint32_t *size)
+{
+	int ret = 0;
+
+	if (!data || !size)
+		return -EINVAL;
+
+	mutex_lock(&smu->sensor_lock);
+	switch (sensor) {
+	case AMDGPU_PP_SENSOR_GPU_LOAD:
+		ret = renoir_get_current_activity_percent(smu, sensor, (uint32_t *)data);
+		*size = 4;
+		break;
+	default:
+		ret = smu_v12_0_read_sensor(smu, sensor, data, size);
+	}
+	mutex_unlock(&smu->sensor_lock);
+
+	return ret;
+}
+
 static const struct pptable_funcs renoir_ppt_funcs = {
 	.get_smu_msg_index = renoir_get_smu_msg_index,
 	.get_smu_table_index = renoir_get_smu_table_index,
@@ -719,6 +794,7 @@ static const struct pptable_funcs renoir_ppt_funcs = {
 	.get_dpm_clock_table = renoir_get_dpm_clock_table,
 	.set_watermarks_table = renoir_set_watermarks_table,
 	.get_power_profile_mode = renoir_get_power_profile_mode,
+	.read_sensor = renoir_read_sensor,
 	.check_fw_status = smu_v12_0_check_fw_status,
 	.check_fw_version = smu_v12_0_check_fw_version,
 	.powergate_sdma = smu_v12_0_powergate_sdma,

drivers/gpu/drm/amd/powerplay/smu_v12_0.c

@@ -223,6 +223,39 @@ int smu_v12_0_set_gfx_cgpg(struct smu_context *smu, bool enable)
 		SMU_MSG_SetGfxCGPG, enable ? 1 : 0);
 }
 
+int smu_v12_0_read_sensor(struct smu_context *smu,
+				 enum amd_pp_sensors sensor,
+				 void *data, uint32_t *size)
+{
+	int ret = 0;
+
+	if(!data || !size)
+		return -EINVAL;
+
+	switch (sensor) {
+	case AMDGPU_PP_SENSOR_GFX_MCLK:
+		ret = smu_get_current_clk_freq(smu, SMU_UCLK, (uint32_t *)data);
+		*size = 4;
+		break;
+	case AMDGPU_PP_SENSOR_GFX_SCLK:
+		ret = smu_get_current_clk_freq(smu, SMU_GFXCLK, (uint32_t *)data);
+		*size = 4;
+		break;
+	case AMDGPU_PP_SENSOR_MIN_FAN_RPM:
+		*(uint32_t *)data = 0;
+		*size = 4;
+		break;
+	default:
+		ret = smu_common_read_sensor(smu, sensor, data, size);
+		break;
+	}
+
+	if (ret)
+		*size = 0;
+
+	return ret;
+}
+
 /**
  * smu_v12_0_get_gfxoff_status - get gfxoff status
  *