drm/doc: Add amdgpu hwmon/power documentation (v2)
Document the hwmon and power control interfaces exposed by the amdgpu driver. v2: use section rather than chapter for now Reviewed-by: Michel Dänzer <michel.daenzer@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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Alex Deucher
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@ -61,3 +61,56 @@ Interrupt Handling
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.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
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:internal:
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GPU Power/Thermal Controls and Monitoring
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=========================================
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This section covers hwmon and power/thermal controls.
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HWMON Interfaces
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----------------
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.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
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:doc: hwmon
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GPU sysfs Power State Interfaces
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--------------------------------
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GPU power controls are exposed via sysfs files.
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power_dpm_state
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~~~~~~~~~~~~~~~
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.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
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:doc: power_dpm_state
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power_dpm_force_performance_level
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
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:doc: power_dpm_force_performance_level
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pp_table
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~~~~~~~~
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.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
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:doc: pp_table
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pp_od_clk_voltage
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~~~~~~~~~~~~~~~~~
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.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
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:doc: pp_od_clk_voltage
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pp_dpm_sclk pp_dpm_mclk pp_dpm_pcie
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
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:doc: pp_dpm_sclk pp_dpm_mclk pp_dpm_pcie
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pp_power_profile_mode
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~~~~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
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:doc: pp_power_profile_mode
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@ -80,12 +80,15 @@ void amdgpu_pm_acpi_event_handler(struct amdgpu_device *adev)
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/**
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* DOC: power_dpm_state
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*
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* This is a legacy interface and is only provided for backwards compatibility.
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* The amdgpu driver provides a sysfs API for adjusting certain power
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* related parameters. The file power_dpm_state is used for this.
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* The power_dpm_state file is a legacy interface and is only provided for
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* backwards compatibility. The amdgpu driver provides a sysfs API for adjusting
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* certain power related parameters. The file power_dpm_state is used for this.
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* It accepts the following arguments:
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*
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* - battery
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*
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* - balanced
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*
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* - performance
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*
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* battery
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@ -169,14 +172,21 @@ static ssize_t amdgpu_set_dpm_state(struct device *dev,
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* The amdgpu driver provides a sysfs API for adjusting certain power
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* related parameters. The file power_dpm_force_performance_level is
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* used for this. It accepts the following arguments:
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*
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* - auto
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*
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* - low
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*
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* - high
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*
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* - manual
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* - GPU fan
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*
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* - profile_standard
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*
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* - profile_min_sclk
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*
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* - profile_min_mclk
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*
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* - profile_peak
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*
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* auto
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@ -463,8 +473,11 @@ static ssize_t amdgpu_set_pp_table(struct device *dev,
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* this.
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*
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* Reading the file will display:
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*
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* - a list of engine clock levels and voltages labeled OD_SCLK
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*
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* - a list of memory clock levels and voltages labeled OD_MCLK
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*
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* - a list of valid ranges for sclk, mclk, and voltage labeled OD_RANGE
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*
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* To manually adjust these settings, first select manual using
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@ -1285,35 +1298,51 @@ static ssize_t amdgpu_hwmon_set_power_cap(struct device *dev,
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* DOC: hwmon
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*
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* The amdgpu driver exposes the following sensor interfaces:
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*
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* - GPU temperature (via the on-die sensor)
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*
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* - GPU voltage
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*
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* - Northbridge voltage (APUs only)
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*
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* - GPU power
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*
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* - GPU fan
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*
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* hwmon interfaces for GPU temperature:
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*
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* - temp1_input: the on die GPU temperature in millidegrees Celsius
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*
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* - temp1_crit: temperature critical max value in millidegrees Celsius
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*
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* - temp1_crit_hyst: temperature hysteresis for critical limit in millidegrees Celsius
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*
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* hwmon interfaces for GPU voltage:
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*
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* - in0_input: the voltage on the GPU in millivolts
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*
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* - in1_input: the voltage on the Northbridge in millivolts
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*
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* hwmon interfaces for GPU power:
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*
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* - power1_average: average power used by the GPU in microWatts
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*
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* - power1_cap_min: minimum cap supported in microWatts
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*
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* - power1_cap_max: maximum cap supported in microWatts
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*
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* - power1_cap: selected power cap in microWatts
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*
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* hwmon interfaces for GPU fan:
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*
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* - pwm1: pulse width modulation fan level (0-255)
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* - pwm1_enable: pulse width modulation fan control method
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* 0: no fan speed control
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* 1: manual fan speed control using pwm interface
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* 2: automatic fan speed control
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*
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* - 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)
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*
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* - pwm1_min: pulse width modulation fan control minimum level (0)
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*
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* - pwm1_max: pulse width modulation fan control maximum level (255)
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*
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* - fan1_input: fan speed in RPM
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*
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* You can use hwmon tools like sensors to view this information on your system.
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