drm/amdgpu: add the sensor value of VCN activity

This will add the sensor value of VCN activity for some ASICs.

Signed-off-by: Xiaojian Du <[e-mail]>
Reviewed-by: Alex Deucher <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

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

···
 	AMDGPU_PP_SENSOR_VCN_POWER_STATE,
 	AMDGPU_PP_SENSOR_PEAK_PSTATE_SCLK,
 	AMDGPU_PP_SENSOR_PEAK_PSTATE_MCLK,
+	AMDGPU_PP_SENSOR_VCN_LOAD,
 };
 
 enum amd_pp_task {

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

···
 }
 
 /**
+ * DOC: vcn_busy_percent
+ *
+ * The amdgpu driver provides a sysfs API for reading how busy the VCN
+ * is as a percentage.  The file vcn_busy_percent is used for this.
+ * The SMU firmware computes a percentage of load based on the
+ * aggregate activity level in the IP cores.
+ */
+static ssize_t amdgpu_get_vcn_busy_percent(struct device *dev,
+						  struct device_attribute *attr,
+						  char *buf)
+{
+	struct drm_device *ddev = dev_get_drvdata(dev);
+	struct amdgpu_device *adev = drm_to_adev(ddev);
+	unsigned int value;
+	int r;
+
+	r = amdgpu_hwmon_get_sensor_generic(adev, AMDGPU_PP_SENSOR_VCN_LOAD, &value);
+	if (r)
+		return r;
+
+	return sysfs_emit(buf, "%d\n", value);
+}
+
+/**
  * DOC: pcie_bw
  *
  * The amdgpu driver provides a sysfs API for estimating how much data
···
 			      .attr_update = pp_od_clk_voltage_attr_update),
 	AMDGPU_DEVICE_ATTR_RO(gpu_busy_percent,				ATTR_FLAG_BASIC|ATTR_FLAG_ONEVF),
 	AMDGPU_DEVICE_ATTR_RO(mem_busy_percent,				ATTR_FLAG_BASIC|ATTR_FLAG_ONEVF),
+	AMDGPU_DEVICE_ATTR_RO(vcn_busy_percent,         ATTR_FLAG_BASIC|ATTR_FLAG_ONEVF),
 	AMDGPU_DEVICE_ATTR_RO(pcie_bw,					ATTR_FLAG_BASIC),
 	AMDGPU_DEVICE_ATTR_RW(pp_features,				ATTR_FLAG_BASIC|ATTR_FLAG_ONEVF),
 	AMDGPU_DEVICE_ATTR_RO(unique_id,				ATTR_FLAG_BASIC|ATTR_FLAG_ONEVF),
···
 		if ((adev->flags & AMD_IS_APU &&
 		     gc_ver != IP_VERSION(9, 4, 3)) ||
 		    gc_ver == IP_VERSION(9, 0, 1))
+			*states = ATTR_STATE_UNSUPPORTED;
+	} else if (DEVICE_ATTR_IS(vcn_busy_percent)) {
+		if (!(gc_ver == IP_VERSION(10, 3, 1) ||
+			  gc_ver == IP_VERSION(10, 3, 3) ||
+			  gc_ver == IP_VERSION(10, 3, 6) ||
+			  gc_ver == IP_VERSION(10, 3, 7) ||
+			  gc_ver == IP_VERSION(11, 0, 1) ||
+			  gc_ver == IP_VERSION(11, 0, 4) ||
+			  gc_ver == IP_VERSION(11, 5, 0)))
 			*states = ATTR_STATE_UNSUPPORTED;
 	} else if (DEVICE_ATTR_IS(pcie_bw)) {
 		/* PCIe Perf counters won't work on APU nodes */
···
 	/* MEM Load */
 	if (!amdgpu_dpm_read_sensor(adev, AMDGPU_PP_SENSOR_MEM_LOAD, (void *)&value, &size))
 		seq_printf(m, "MEM Load: %u %%\n", value);
+	/* VCN Load */
+	if (!amdgpu_dpm_read_sensor(adev, AMDGPU_PP_SENSOR_VCN_LOAD, (void *)&value, &size))
+		seq_printf(m, "VCN Load: %u %%\n", value);
 
 	seq_printf(m, "\n");