drm/amd/pm: Add support to fetch pm metrics sample

Add API support to fetch a snapshot of power management metrics from PMFW.
Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Yang Wang <kevinyang.wang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/include/kgd_pp_interface.h

@@ -431,6 +431,7 @@ struct amd_pm_funcs {
 	int (*set_df_cstate)(void *handle, enum pp_df_cstate state);
 	int (*set_xgmi_pstate)(void *handle, uint32_t pstate);
 	ssize_t (*get_gpu_metrics)(void *handle, void **table);
+	ssize_t (*get_pm_metrics)(void *handle, void *pmmetrics, size_t size);
 	int (*set_watermarks_for_clock_ranges)(void *handle,
 					       struct pp_smu_wm_range_sets *ranges);
 	int (*display_disable_memory_clock_switch)(void *handle,

drivers/gpu/drm/amd/pm/amdgpu_dpm.c

@@ -1299,6 +1299,23 @@ int amdgpu_dpm_get_gpu_metrics(struct amdgpu_device *adev, void **table)
 	return ret;
 }
 
+ssize_t amdgpu_dpm_get_pm_metrics(struct amdgpu_device *adev, void *pm_metrics,
+				  size_t size)
+{
+	const struct amd_pm_funcs *pp_funcs = adev->powerplay.pp_funcs;
+	int ret = 0;
+
+	if (!pp_funcs->get_pm_metrics)
+		return -EOPNOTSUPP;
+
+	mutex_lock(&adev->pm.mutex);
+	ret = pp_funcs->get_pm_metrics(adev->powerplay.pp_handle, pm_metrics,
+				       size);
+	mutex_unlock(&adev->pm.mutex);
+
+	return ret;
+}
+
 int amdgpu_dpm_get_fan_control_mode(struct amdgpu_device *adev,
 				    uint32_t *fan_mode)
 {

drivers/gpu/drm/amd/pm/inc/amdgpu_dpm.h

@@ -511,6 +511,18 @@ int amdgpu_dpm_get_power_profile_mode(struct amdgpu_device *adev,
 int amdgpu_dpm_set_power_profile_mode(struct amdgpu_device *adev,
 				      long *input, uint32_t size);
 int amdgpu_dpm_get_gpu_metrics(struct amdgpu_device *adev, void **table);
+
+/**
+ * @get_pm_metrics: Get one snapshot of power management metrics from PMFW. The
+ * sample is copied to pm_metrics buffer. It's expected to be allocated by the
+ * caller and size of the allocated buffer is passed. Max size expected for a
+ * metrics sample is 4096 bytes.
+ *
+ * Return: Actual size of the metrics sample
+ */
+ssize_t amdgpu_dpm_get_pm_metrics(struct amdgpu_device *adev, void *pm_metrics,
+				  size_t size);
+
 int amdgpu_dpm_get_fan_control_mode(struct amdgpu_device *adev,
 				    uint32_t *fan_mode);
 int amdgpu_dpm_set_fan_speed_pwm(struct amdgpu_device *adev,

drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c

@@ -3189,6 +3189,20 @@ static ssize_t smu_sys_get_gpu_metrics(void *handle, void **table)
 	return smu->ppt_funcs->get_gpu_metrics(smu, table);
 }
 
+static ssize_t smu_sys_get_pm_metrics(void *handle, void *pm_metrics,
+				      size_t size)
+{
+	struct smu_context *smu = handle;
+
+	if (!smu->pm_enabled || !smu->adev->pm.dpm_enabled)
+		return -EOPNOTSUPP;
+
+	if (!smu->ppt_funcs->get_pm_metrics)
+		return -EOPNOTSUPP;
+
+	return smu->ppt_funcs->get_pm_metrics(smu, pm_metrics, size);
+}
+
 static int smu_enable_mgpu_fan_boost(void *handle)
 {
 	struct smu_context *smu = handle;
@@ -3330,6 +3344,7 @@ static const struct amd_pm_funcs swsmu_pm_funcs = {
 	.set_df_cstate                    = smu_set_df_cstate,
 	.set_xgmi_pstate                  = smu_set_xgmi_pstate,
 	.get_gpu_metrics                  = smu_sys_get_gpu_metrics,
+	.get_pm_metrics                   = smu_sys_get_pm_metrics,
 	.set_watermarks_for_clock_ranges     = smu_set_watermarks_for_clock_ranges,
 	.display_disable_memory_clock_switch = smu_display_disable_memory_clock_switch,
 	.get_max_sustainable_clocks_by_dc    = smu_get_max_sustainable_clocks_by_dc,

drivers/gpu/drm/amd/pm/swsmu/inc/amdgpu_smu.h

@@ -253,6 +253,7 @@ struct smu_table {
 	uint64_t mc_address;
 	void *cpu_addr;
 	struct amdgpu_bo *bo;
+	uint32_t version;
 };
 
 enum smu_perf_level_designation {
@@ -1252,6 +1253,15 @@ struct pptable_funcs {
 	 */
 	ssize_t (*get_gpu_metrics)(struct smu_context *smu, void **table);
 
+	/**
+	 * @get_pm_metrics: Get one snapshot of power management metrics from
+	 * PMFW.
+	 *
+	 * Return: Size of the metrics sample
+	 */
+	ssize_t (*get_pm_metrics)(struct smu_context *smu, void *pm_metrics,
+				  size_t size);
+
 	/**
 	 * @enable_mgpu_fan_boost: Enable multi-GPU fan boost.
 	 */

drivers/gpu/drm/amd/pm/swsmu/inc/smu_types.h

@@ -259,7 +259,8 @@
 	__SMU_DUMMY_MAP(PowerUpUmsch),	\
 	__SMU_DUMMY_MAP(PowerDownUmsch),	\
 	__SMU_DUMMY_MAP(SetSoftMaxVpe),	\
-	__SMU_DUMMY_MAP(SetSoftMinVpe),
+	__SMU_DUMMY_MAP(SetSoftMinVpe), \
+	__SMU_DUMMY_MAP(GetMetricsVersion),
 
 #undef __SMU_DUMMY_MAP
 #define __SMU_DUMMY_MAP(type)	SMU_MSG_##type