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 52\*_busy_percent 53--------------- 54 55.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c 56 :doc: gpu_busy_percent 57 58.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c 59 :doc: mem_busy_percent 60 61gpu_metrics 62----------- 63 64.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c 65 :doc: gpu_metrics 66 67GFXOFF 68====== 69 70GFXOFF is a feature found in most recent GPUs that saves power at runtime. The 71card's RLC (RunList Controller) firmware powers off the gfx engine 72dynamically when there is no workload on gfx or compute pipes. GFXOFF is on by 73default on supported GPUs. 74 75Userspace can interact with GFXOFF through a debugfs interface (all values in 76`uint32_t`, unless otherwise noted): 77 78``amdgpu_gfxoff`` 79----------------- 80 81Use it to enable/disable GFXOFF, and to check if it's current enabled/disabled:: 82 83 $ xxd -l1 -p /sys/kernel/debug/dri/0/amdgpu_gfxoff 84 01 85 86- Write 0 to disable it, and 1 to enable it. 87- Read 0 means it's disabled, 1 it's enabled. 88 89If it's enabled, that means that the GPU is free to enter into GFXOFF mode as 90needed. Disabled means that it will never enter GFXOFF mode. 91 92``amdgpu_gfxoff_status`` 93------------------------ 94 95Read it to check current GFXOFF's status of a GPU:: 96 97 $ xxd -l1 -p /sys/kernel/debug/dri/0/amdgpu_gfxoff_status 98 02 99 100- 0: GPU is in GFXOFF state, the gfx engine is powered down. 101- 1: Transition out of GFXOFF state 102- 2: Not in GFXOFF state 103- 3: Transition into GFXOFF state 104 105If GFXOFF is enabled, the value will be transitioning around [0, 3], always 106getting into 0 when possible. When it's disabled, it's always at 2. Returns 107``-EINVAL`` if it's not supported. 108 109``amdgpu_gfxoff_count`` 110----------------------- 111 112Read it to get the total GFXOFF entry count at the time of query since system 113power-up. The value is an `uint64_t` type, however, due to firmware limitations, 114it can currently overflow as an `uint32_t`. *Only supported in vangogh* 115 116``amdgpu_gfxoff_residency`` 117--------------------------- 118 119Write 1 to amdgpu_gfxoff_residency to start logging, and 0 to stop. Read it to 120get average GFXOFF residency % multiplied by 100 during the last logging 121interval. E.g. a value of 7854 means 78.54% of the time in the last logging 122interval the GPU was in GFXOFF mode. *Only supported in vangogh* 123