drm/nouveau/hwmon: add power consumption

v2: expose only if the sensor reading is valid
Signed-off-by: Karol Herbst <nouveau@karolherbst.de>
Reviewed-by: Martin Peres <martin.peres@free.fr>

drivers/gpu/drm/nouveau/include/nvif/device.h

@@ -62,6 +62,7 @@ u64  nvif_device_time(struct nvif_device *);
 #define nvxx_gpio(a) nvxx_device(a)->gpio
 #define nvxx_clk(a) nvxx_device(a)->clk
 #define nvxx_i2c(a) nvxx_device(a)->i2c
+#define nvxx_iccsense(a) nvxx_device(a)->iccsense
 #define nvxx_therm(a) nvxx_device(a)->therm
 #define nvxx_volt(a) nvxx_device(a)->volt
 

drivers/gpu/drm/nouveau/nouveau_hwmon.c

@@ -34,6 +34,7 @@
 #include "nouveau_drm.h"
 #include "nouveau_hwmon.h"
 
+#include <nvkm/subdev/iccsense.h>
 #include <nvkm/subdev/volt.h>
 
 #if defined(CONFIG_HWMON) || (defined(MODULE) && defined(CONFIG_HWMON_MODULE))
@@ -543,6 +544,24 @@ nouveau_hwmon_get_in0_label(struct device *d,
 static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO,
 			  nouveau_hwmon_get_in0_label, NULL, 0);
 
+static ssize_t
+nouveau_hwmon_get_power1_input(struct device *d, struct device_attribute *a,
+			       char *buf)
+{
+	struct drm_device *dev = dev_get_drvdata(d);
+	struct nouveau_drm *drm = nouveau_drm(dev);
+	struct nvkm_iccsense *iccsense = nvxx_iccsense(&drm->device);
+	int result = nvkm_iccsense_read_all(iccsense);
+
+	if (result < 0)
+		return result;
+
+	return sprintf(buf, "%i\n", result);
+}
+
+static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO,
+			  nouveau_hwmon_get_power1_input, NULL, 0);
+
 static struct attribute *hwmon_default_attributes[] = {
 	&sensor_dev_attr_name.dev_attr.attr,
 	&sensor_dev_attr_update_rate.dev_attr.attr,
@@ -579,6 +598,11 @@ static struct attribute *hwmon_in0_attributes[] = {
 	NULL
 };
 
+static struct attribute *hwmon_power_attributes[] = {
+	&sensor_dev_attr_power1_input.dev_attr.attr,
+	NULL
+};
+
 static const struct attribute_group hwmon_default_attrgroup = {
 	.attrs = hwmon_default_attributes,
 };
@@ -594,6 +618,9 @@ static const struct attribute_group hwmon_pwm_fan_attrgroup = {
 static const struct attribute_group hwmon_in0_attrgroup = {
 	.attrs = hwmon_in0_attributes,
 };
+static const struct attribute_group hwmon_power_attrgroup = {
+	.attrs = hwmon_power_attributes,
+};
 #endif
 
 int
@@ -603,6 +630,7 @@ nouveau_hwmon_init(struct drm_device *dev)
 	struct nouveau_drm *drm = nouveau_drm(dev);
 	struct nvkm_therm *therm = nvxx_therm(&drm->device);
 	struct nvkm_volt *volt = nvxx_volt(&drm->device);
+	struct nvkm_iccsense *iccsense = nvxx_iccsense(&drm->device);
 	struct nouveau_hwmon *hwmon;
 	struct device *hwmon_dev;
 	int ret = 0;
@@ -662,6 +690,13 @@ nouveau_hwmon_init(struct drm_device *dev)
 			goto error;
 	}
 
+	if (iccsense && iccsense->data_valid && iccsense->rail_count) {
+		ret = sysfs_create_group(&hwmon_dev->kobj,
+					 &hwmon_power_attrgroup);
+		if (ret)
+			goto error;
+	}
+
 	hwmon->hwmon = hwmon_dev;
 
 	return 0;
@@ -688,6 +723,7 @@ nouveau_hwmon_fini(struct drm_device *dev)
 		sysfs_remove_group(&hwmon->hwmon->kobj, &hwmon_pwm_fan_attrgroup);
 		sysfs_remove_group(&hwmon->hwmon->kobj, &hwmon_fan_rpm_attrgroup);
 		sysfs_remove_group(&hwmon->hwmon->kobj, &hwmon_in0_attrgroup);
+		sysfs_remove_group(&hwmon->hwmon->kobj, &hwmon_power_attrgroup);
 
 		hwmon_device_unregister(hwmon->hwmon);
 	}