123 lines
3.3 KiB
ReStructuredText
123 lines
3.3 KiB
ReStructuredText
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===========================================
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GPU Power/Thermal Controls and Monitoring
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===========================================
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HWMON Interfaces
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================
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.. kernel-doc:: drivers/gpu/drm/amd/pm/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/pm/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/pm/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/pm/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/pm/amdgpu_pm.c
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:doc: pp_od_clk_voltage
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pp_dpm_*
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--------
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.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
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:doc: pp_dpm_sclk pp_dpm_mclk pp_dpm_socclk pp_dpm_fclk pp_dpm_dcefclk 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/pm/amdgpu_pm.c
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:doc: pp_power_profile_mode
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\*_busy_percent
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---------------
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.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
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:doc: gpu_busy_percent
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.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
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:doc: mem_busy_percent
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gpu_metrics
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-----------
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.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
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:doc: gpu_metrics
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GFXOFF
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======
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GFXOFF is a feature found in most recent GPUs that saves power at runtime. The
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card's RLC (RunList Controller) firmware powers off the gfx engine
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dynamically when there is no workload on gfx or compute pipes. GFXOFF is on by
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default on supported GPUs.
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Userspace can interact with GFXOFF through a debugfs interface (all values in
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`uint32_t`, unless otherwise noted):
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``amdgpu_gfxoff``
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-----------------
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Use it to enable/disable GFXOFF, and to check if it's current enabled/disabled::
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$ xxd -l1 -p /sys/kernel/debug/dri/0/amdgpu_gfxoff
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01
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- Write 0 to disable it, and 1 to enable it.
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- Read 0 means it's disabled, 1 it's enabled.
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If it's enabled, that means that the GPU is free to enter into GFXOFF mode as
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needed. Disabled means that it will never enter GFXOFF mode.
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``amdgpu_gfxoff_status``
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------------------------
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Read it to check current GFXOFF's status of a GPU::
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$ xxd -l1 -p /sys/kernel/debug/dri/0/amdgpu_gfxoff_status
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02
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- 0: GPU is in GFXOFF state, the gfx engine is powered down.
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- 1: Transition out of GFXOFF state
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- 2: Not in GFXOFF state
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- 3: Transition into GFXOFF state
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If GFXOFF is enabled, the value will be transitioning around [0, 3], always
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getting into 0 when possible. When it's disabled, it's always at 2. Returns
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``-EINVAL`` if it's not supported.
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``amdgpu_gfxoff_count``
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-----------------------
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Read it to get the total GFXOFF entry count at the time of query since system
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power-up. The value is an `uint64_t` type, however, due to firmware limitations,
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it can currently overflow as an `uint32_t`. *Only supported in vangogh*
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``amdgpu_gfxoff_residency``
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---------------------------
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Write 1 to amdgpu_gfxoff_residency to start logging, and 0 to stop. Read it to
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get average GFXOFF residency % multiplied by 100 during the last logging
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interval. E.g. a value of 7854 means 78.54% of the time in the last logging
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interval the GPU was in GFXOFF mode. *Only supported in vangogh*
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