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drm/amdgpu: add documentation on hwmon interfaces exposed (v3)

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Provide detail on the currently exposed hwmon interfaces
for temperature, power, voltage, and fan.

v2: add power cap documentation
v3: add a comment about sensors tool

Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2018-03-26 12:56:56 -05:00
parent e68d14dd4e
commit 844c541951
1 changed files with 40 additions and 0 deletions
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40
drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
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@ -1109,6 +1109,46 @@ static ssize_t amdgpu_hwmon_set_power_cap(struct device *dev,
return count;
}
/**
* DOC: hwmon
*
* The amdgpu driver exposes the following sensor interfaces:
* - GPU temperature (via the on-die sensor)
* - GPU voltage
* - Northbridge voltage (APUs only)
* - GPU power
* - GPU fan
*
* hwmon interfaces for GPU temperature:
* - temp1_input: the on die GPU temperature in millidegrees Celsius
* - temp1_crit: temperature critical max value in millidegrees Celsius
* - temp1_crit_hyst: temperature hysteresis for critical limit in millidegrees Celsius
*
* hwmon interfaces for GPU voltage:
* - in0_input: the voltage on the GPU in millivolts
* - in1_input: the voltage on the Northbridge in millivolts
*
* hwmon interfaces for GPU power:
* - power1_average: average power used by the GPU in microWatts
* - power1_cap_min: minimum cap supported in microWatts
* - power1_cap_max: maximum cap supported in microWatts
* - power1_cap: selected power cap in microWatts
*
* hwmon interfaces for GPU fan:
* - pwm1: pulse width modulation fan level (0-255)
* - pwm1_enable: pulse width modulation fan control method
* 0: no fan speed control
* 1: manual fan speed control using pwm interface
* 2: automatic fan speed control
* - pwm1_min: pulse width modulation fan control minimum level (0)
* - pwm1_max: pulse width modulation fan control maximum level (255)
* - fan1_input: fan speed in RPM
*
* You can use hwmon tools like sensors to view this information on your system.
*
*/
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, amdgpu_hwmon_show_temp, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, amdgpu_hwmon_show_temp_thresh, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO, amdgpu_hwmon_show_temp_thresh, NULL, 1);