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https://github.com/sibradzic/amdgpu-clocks

Simple script to control power states of amdgpu driven GPUs
https://github.com/sibradzic/amdgpu-clocks

Last synced: 2 months ago
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Simple script to control power states of amdgpu driven GPUs

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README 

        
## AMDGPU Clocks



### Introduction



This is a simple script that can be used to set custom power states for recent

AMD GPUs that are driven by **amdgpu** Linux kernel driver. The script is able

to set custom clocks, voltages and some other power states, assuming that

Radeon OverDrive is enabled in kernel boot opions. The OverDrive is not enabled

by default as of Linux 5.x, it can be enabled by setting 14th bit (0x4000) of a

**ppfeaturemask** amdgpu driver to 1. For example, setting

**amdgpu.ppfeaturemask=0xfffd7fff** or **amdgpu.ppfeaturemask=0xffffffff**

kernel boot option will do the trick. This would enable amdgpu driver sysfs

API that allows fine grain control of GPU power states (GPU & VRAM clocks &

voltages, depending on the actual hardware).

It should work on Polaris, Vega (unfortunately Vega found on AMD APUs does

not expose this API), Navi and RDNA cards, and it can be used to easily manage

multiple AMD graphics cards.



### How does it work



By default, custom power states for a particular GPU can be defined in

`/etc/default/amdgpu-custom-state.cardX` file, which is expected to be created

by user, and where X corresponds to a card in `/sys/class/drm/cardX`. The

custom state file have same format as the actual

`/sys/class/drm/cardX/device/pp_od_clk_voltage`, with option to add

newlines, comments (lines starting with `#`) and few additional parameters used

to set extra power state parameters. These are **FORCE_SCLK** & **FORCE_MCLK**,

that can be used to limit GPU and memory power states to a particular subset

of states, **FORCE_POWER_CAP** that can be used to set desired power cap,

**FORCE_PERF_LEVEL** that can be used to force desired

`power_dpm_force_performance_level` for a card (which can be `auto`, `low`,

`high`, `manual`, etc) and **FORCE_POWER_PROFILE** used for manually setting

the profile found in card's `pp_power_profile_mode`.



Here is an example how custom power state file may look like for Polaris cards:



    $ cat /etc/default/amdgpu-custom-states.card0

    # Set custom GPU states 6 & 7:

    OD_SCLK:

    6:       1000MHz        860mV

    7:       1050MHz        890mV

    # Set custom memory states 1 & 2:

    OD_MCLK:

    1:        900MHz        800mV

    2:       1600MHz        900mV

    # Only allow SCLK states 5, 6 & 7:

    FORCE_SCLK: 5 6 7

    # Force fixed memory state:

    FORCE_MCLK: 2

    # Force power limit (in micro watts):

    FORCE_POWER_CAP: 90000000

    # In order to allow FORCE_SCLK & FORCE_MCLK:

    FORCE_PERF_LEVEL: manual



Here is an example how custom power state file may look like for Navi cards:



    # For Navi (and Radeon7) we can only set highest SCLK & MCLK, "state 1":

    OD_SCLK:

    1: 1550MHz

    OD_MCLK:

    1: 750MHz

    # More fine-grain control of clocks and voltages are done with VDDC curve:

    OD_VDDC_CURVE:

    0: 800MHz @ 800mV

    1: 1125MHz @ 820mV

    2: 1550MHz @ 850mV

    # Force power limit (in micro watts):

    FORCE_POWER_CAP: 87000000

    FORCE_PERF_LEVEL: manual



Here is an example how custom power state file may look like for RDNA2 cards:



    OD_VDDGFX_OFFSET:

    -75mV

    FORCE_PERF_LEVEL: manual

    FORCE_POWER_CAP: 99000000



### Installing and manually running the script



Simply place the [script](amdgpu-clocks) in `/usr/local/bin/amdgpu-clocks`:



    sudo ln -s $(pwd)/amdgpu-clocks /usr/local/bin/amdgpu-clocks



and specify custom power states in `/etc/default/amdgpu-custom-states.card0`:



    $ sudo amdgpu-clocks



    Detecting the state values at /sys/class/drm/card0/device/pp_od_clk_voltage:

      SCLK state 0: 700Mhz

      SCLK state 1: 2539Mhz

      MCLK state 0: 97Mhz

      MCLK state 1: 1000MHz

      VDD GFX Offset: 0mV

      Maximum clocks & voltages:

        SCLK clock 3150Mhz

        MCLK clock 1200Mhz

      Curent power cap: 130W

    Verifying user state values at /etc/default/amdgpu-custom-state.card0:

      VDD GFX Offset: -75mV

      Force performance level to manual

      Force power cap to 99W

    Committing custom states to /sys/class/drm/card0/device/pp_od_clk_voltage:

      Done



The script can also be invoked with specific custom state file prefix (can be

a directory, case trailing slash is supplied), for example:



    $ sudo USER_STATES_PATH=custom-states amdgpu-clocks



This will load and apply custom states from all `custom-states.card*` files

in the current directory. Script can also be used with an additional 'restore'

parameter that can be used to restore all states to the initial defaults

(states before script was executed for the first time), with exception of

`pp_power_profile_mode` which will be set to 0.



### Making the custom power states persist



This can be achieved by placing provided *systemd* service

[file](amdgpu-clocks.service) in `/etc/systemd/system/` directory,

and enable it:



    $ sudo systemctl enable --now amdgpu-clocks



However, if your system goes to suspend state, the above service will not

auto-restart (due to RemainAfterExit parameter). To fix that copy provided

[file](amdgpu-clocks-resume) into `/usr/lib/systemd/system-sleep`



    $ cp amdgpu-clocks-resume /usr/lib/systemd/system-sleep/



Of course, one should not forget to place the actual custom power states in

`/etc/default/amdgpu-custom-state.cardX`.