1 =========================================== 2 GPU Power/Thermal Controls and Monitoring 3 =========================================== 4 5 HWMON Interfaces 6 ================ 7 8 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c 9 :doc: hwmon 10 11 GPU sysfs Power State Interfaces 12 ================================ 13 14 GPU power controls are exposed via sysfs files. 15 16 power_dpm_state 17 --------------- 18 19 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c 20 :doc: power_dpm_state 21 22 power_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 28 pp_table 29 -------- 30 31 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c 32 :doc: pp_table 33 34 pp_od_clk_voltage 35 ----------------- 36 37 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c 38 :doc: pp_od_clk_voltage 39 40 pp_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 46 pp_power_profile_mode 47 --------------------- 48 49 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c 50 :doc: pp_power_profile_mode 51 52 pm_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 67 gpu_metrics 68 ----------- 69 70 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c 71 :doc: gpu_metrics 72 73 fan_curve 74 --------- 75 76 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c 77 :doc: fan_curve 78 79 acoustic_limit_rpm_threshold 80 ---------------------------- 81 82 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c 83 :doc: acoustic_limit_rpm_threshold 84 85 acoustic_target_rpm_threshold 86 ----------------------------- 87 88 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c 89 :doc: acoustic_target_rpm_threshold 90 91 fan_target_temperature 92 ---------------------- 93 94 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c 95 :doc: fan_target_temperature 96 97 fan_minimum_pwm 98 --------------- 99 100 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c 101 :doc: fan_minimum_pwm 102 103 GFXOFF 104 ====== 105 106 GFXOFF is a feature found in most recent GPUs that saves power at runtime. The 107 card's RLC (RunList Controller) firmware powers off the gfx engine 108 dynamically when there is no workload on gfx or compute pipes. GFXOFF is on by 109 default on supported GPUs. 110 111 Userspace can interact with GFXOFF through a debugfs interface (all values in 112 `uint32_t`, unless otherwise noted): 113 114 ``amdgpu_gfxoff`` 115 ----------------- 116 117 Use 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. 124 125 If it's enabled, that means that the GPU is free to enter into GFXOFF mode as 126 needed. Disabled means that it will never enter GFXOFF mode. 127 128 ``amdgpu_gfxoff_status`` 129 ------------------------ 130 131 Read 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 140 141 If GFXOFF is enabled, the value will be transitioning around [0, 3], always 142 getting 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 ----------------------- 147 148 Read it to get the total GFXOFF entry count at the time of query since system 149 power-up. The value is an `uint64_t` type, however, due to firmware limitations, 150 it can currently overflow as an `uint32_t`. *Only supported in vangogh* 151 152 ``amdgpu_gfxoff_residency`` 153 --------------------------- 154 155 Write 1 to amdgpu_gfxoff_residency to start logging, and 0 to stop. Read it to 156 get average GFXOFF residency % multiplied by 100 during the last logging 157 interval. E.g. a value of 7854 means 78.54% of the time in the last logging 158 interval the GPU was in GFXOFF mode. *Only supported in vangogh*
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