1 ===========================================
2 GPU Power/Thermal Controls and Monitoring
3 ===========================================
8 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
11 GPU sysfs Power State Interfaces
12 ================================
14 GPU power controls are exposed via sysfs files.
19 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
22 power_dpm_force_performance_level
23 ---------------------------------
25 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
26 :doc: power_dpm_force_performance_level
31 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
37 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
38 :doc: pp_od_clk_voltage
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
49 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
50 :doc: pp_power_profile_mode
55 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
56 :doc: gpu_busy_percent
58 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
59 :doc: mem_busy_percent
64 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
70 GFXOFF is a feature found in most recent GPUs that saves power at runtime. The
71 card's RLC (RunList Controller) firmware powers off the gfx engine
72 dynamically when there is no workload on gfx or compute pipes. GFXOFF is on by
73 default on supported GPUs.
75 Userspace can interact with GFXOFF through a debugfs interface (all values in
76 `uint32_t`, unless otherwise noted):
81 Use it to enable/disable GFXOFF, and to check if it's current enabled/disabled::
83 $ xxd -l1 -p /sys/kernel/debug/dri/0/amdgpu_gfxoff
86 - Write 0 to disable it, and 1 to enable it.
87 - Read 0 means it's disabled, 1 it's enabled.
89 If it's enabled, that means that the GPU is free to enter into GFXOFF mode as
90 needed. Disabled means that it will never enter GFXOFF mode.
92 ``amdgpu_gfxoff_status``
93 ------------------------
95 Read it to check current GFXOFF's status of a GPU::
97 $ xxd -l1 -p /sys/kernel/debug/dri/0/amdgpu_gfxoff_status
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
105 If GFXOFF is enabled, the value will be transitioning around [0, 3], always
106 getting into 0 when possible. When it's disabled, it's always at 2. Returns
107 ``-EINVAL`` if it's not supported.
109 ``amdgpu_gfxoff_count``
110 -----------------------
112 Read it to get the total GFXOFF entry count at the time of query since system
113 power-up. The value is an `uint64_t` type, however, due to firmware limitations,
114 it can currently overflow as an `uint32_t`. *Only supported in vangogh*
116 ``amdgpu_gfxoff_residency``
117 ---------------------------
119 Write 1 to amdgpu_gfxoff_residency to start logging, and 0 to stop. Read it to
120 get average GFXOFF residency % multiplied by 100 during the last logging
121 interval. E.g. a value of 7854 means 78.54% of the time in the last logging
122 interval the GPU was in GFXOFF mode. *Only supported in vangogh*