1=========================================== 2 GPU Power/Thermal Controls and Monitoring 3=========================================== 4 5HWMON Interfaces 6================ 7 8.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c 9 :doc: hwmon 10 11GPU sysfs Power State Interfaces 12================================ 13 14GPU power controls are exposed via sysfs files. 15 16power_dpm_state 17--------------- 18 19.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c 20 :doc: power_dpm_state 21 22power_dpm_force_performance_level 23--------------------------------- 24 25.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c 26 :doc: power_dpm_force_performance_level 27 28pp_table 29-------- 30 31.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c 32 :doc: pp_table 33 34pp_od_clk_voltage 35----------------- 36 37.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c 38 :doc: pp_od_clk_voltage 39 40pp_dpm_* 41-------- 42 43.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c 44 :doc: pp_dpm_sclk pp_dpm_mclk pp_dpm_socclk pp_dpm_fclk pp_dpm_dcefclk pp_dpm_pcie 45 46pp_power_profile_mode 47--------------------- 48 49.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c 50 :doc: pp_power_profile_mode 51 52pm_policy 53--------------------- 54 55.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c 56 :doc: pm_policy 57 58\*_busy_percent 59--------------- 60 61.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c 62 :doc: gpu_busy_percent 63 64.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c 65 :doc: mem_busy_percent 66 67gpu_metrics 68----------- 69 70.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c 71 :doc: gpu_metrics 72 73fan_curve 74--------- 75 76.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c 77 :doc: fan_curve 78 79acoustic_limit_rpm_threshold 80---------------------------- 81 82.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c 83 :doc: acoustic_limit_rpm_threshold 84 85acoustic_target_rpm_threshold 86----------------------------- 87 88.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c 89 :doc: acoustic_target_rpm_threshold 90 91fan_target_temperature 92---------------------- 93 94.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c 95 :doc: fan_target_temperature 96 97fan_minimum_pwm 98--------------- 99 100.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c 101 :doc: fan_minimum_pwm 102 103GFXOFF 104====== 105 106GFXOFF is a feature found in most recent GPUs that saves power at runtime. The 107card's RLC (RunList Controller) firmware powers off the gfx engine 108dynamically when there is no workload on gfx or compute pipes. GFXOFF is on by 109default on supported GPUs. 110 111Userspace can interact with GFXOFF through a debugfs interface (all values in 112`uint32_t`, unless otherwise noted): 113 114``amdgpu_gfxoff`` 115----------------- 116 117Use it to enable/disable GFXOFF, and to check if it's current enabled/disabled:: 118 119 $ xxd -l1 -p /sys/kernel/debug/dri/0/amdgpu_gfxoff 120 01 121 122- Write 0 to disable it, and 1 to enable it. 123- Read 0 means it's disabled, 1 it's enabled. 124 125If it's enabled, that means that the GPU is free to enter into GFXOFF mode as 126needed. Disabled means that it will never enter GFXOFF mode. 127 128``amdgpu_gfxoff_status`` 129------------------------ 130 131Read it to check current GFXOFF's status of a GPU:: 132 133 $ xxd -l1 -p /sys/kernel/debug/dri/0/amdgpu_gfxoff_status 134 02 135 136- 0: GPU is in GFXOFF state, the gfx engine is powered down. 137- 1: Transition out of GFXOFF state 138- 2: Not in GFXOFF state 139- 3: Transition into GFXOFF state 140 141If GFXOFF is enabled, the value will be transitioning around [0, 3], always 142getting into 0 when possible. When it's disabled, it's always at 2. Returns 143``-EINVAL`` if it's not supported. 144 145``amdgpu_gfxoff_count`` 146----------------------- 147 148Read it to get the total GFXOFF entry count at the time of query since system 149power-up. The value is an `uint64_t` type, however, due to firmware limitations, 150it can currently overflow as an `uint32_t`. *Only supported in vangogh* 151 152``amdgpu_gfxoff_residency`` 153--------------------------- 154 155Write 1 to amdgpu_gfxoff_residency to start logging, and 0 to stop. Read it to 156get average GFXOFF residency % multiplied by 100 during the last logging 157interval. E.g. a value of 7854 means 78.54% of the time in the last logging 158interval the GPU was in GFXOFF mode. *Only supported in vangogh* 159