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AMD GPU: Difference between revisions

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Information about iGPU usage of VRAM/GTT for large amounts of VRAM/GTT for LLM (source: based on a forum comment https://community.frame.work/t/igpu-vram-how-much-can-be-assigned/73081/6 of https://community.frame.work/u/lhl/summary )
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m fix formatting and syntax highlighting :-)
 
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[https://en.wikipedia.org/wiki/AMDgpu_(Linux_kernel_module) AMDGPU] is an open source graphics driver for AMD Radeon graphics cards. It supports AMD GPUs based on the [https://en.wikipedia.org/wiki/Graphics_Core_Next GCN architecture Graphics Core Next (GCN)] architecture and later, covering hardware released from approximately 2012 onward. This guide is about configuration of NixOS to correctly use AMD GPUs supported by the AMDGPU driver.
[[Wikipedia:AMDgpu (Linux kernel module)|AMDGPU]] is an open source graphics driver for AMD Radeon graphics cards. It supports AMD GPUs based on the [[Wikipedia:Graphics Core Next|Graphics Core Next (GCN)]] architecture and later, covering hardware released from approximately 2012 onward. This guide is about configuration of NixOS to correctly use AMD GPUs supported by the AMDGPU driver.


== Basic Setup ==
== Basic Setup ==
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<syntaxhighlight lang="nix">
<syntaxhighlight lang="nix">
boot.kernelParams = [
boot.kernelParams = [
    # For Southern Islands (SI i.e. GCN 1) cards
  # For Southern Islands (SI i.e. GCN 1) cards
    "amdgpu.si_support=1"
  "amdgpu.si_support=1"
    "radeon.si_support=0"
  "radeon.si_support=0"
    # For Sea Islands (CIK i.e. GCN 2) cards
  # For Sea Islands (CIK i.e. GCN 2) cards
    "amdgpu.cik_support=1"
  "amdgpu.cik_support=1"
    "radeon.cik_support=0"
  "radeon.cik_support=0"
];
];
</syntaxhighlight>
</syntaxhighlight>
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<syntaxhighlight lang="nix">
<syntaxhighlight lang="nix">
  systemd.tmpfiles.rules =  
systemd.tmpfiles.rules =
   let
   let
     rocmEnv = pkgs.symlinkJoin {
     rocmEnv = pkgs.symlinkJoin {
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       ];
       ];
     };
     };
   in [
   in
  [
     "L+    /opt/rocm  -    -    -    -    ${rocmEnv}"
     "L+    /opt/rocm  -    -    -    -    ${rocmEnv}"
   ];
   ];
</syntaxhighlight>
=== Enabling  ROCm & HIP For Packages ===
Whether or not a package is built with ROCm support is controlled by the <code>rocmSupport</code> nixpkgs config variable. As HIP is a component of ROCm, anything that needs HIP support (e.g. Blender) gets that enabled through <code>rocmSupport</code> too.
You can set it globally with this line


<syntaxhighlight lang="nix">
nixpkgs.config.rocmSupport = true;
</syntaxhighlight>
</syntaxhighlight>


==== Blender ====
Or override specific packages
Hardware accelerated rendering can be achieved by using the package <syntaxhighlight lang="nix" inline="">blender-hip</syntaxhighlight>.
 
<syntaxhighlight lang="nix">
environment.systemPackages = with pkgs; [
  (ffmpeg-full.override { config.rocmSupport = true; })
  pkgsRocm.ffmpeg-full # equivalent to (ffmpeg-full.override {config.rocmSupport=true;}) for packages in ROCm Release attrPaths
];
</syntaxhighlight>


Currently, you need to [[Linux kernel|use the latest kernel]] for <syntaxhighlight lang="nix" inline="">blender-hip</syntaxhighlight> to work.
While most if not all packages that support ROCm should be in the [https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/rocm-modules/release-attrPaths.json ROCm Release attrPaths], and therefore built by Hydra and cached in cache.nixos.org with <code>rocmSupport</code>, enabling it globally still has a slight chance of pointless compiling on your machine.
 
For Blender-specific information on setting up HIP support, see: [[Blender#HIP]].


=== OpenCL ===
=== OpenCL ===
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Vulkan is already enabled by default (using Mesa RADV) on 64 bit applications. The settings to control it are now the same as those shown in the basic setup:
Vulkan is already enabled by default (using Mesa RADV) on 64 bit applications. The settings to control it are now the same as those shown in the basic setup:


<syntaxhighlight lang="nix">hardware.graphics.enable = true;
<syntaxhighlight lang="nix">
hardware.graphics.enable = true;
hardware.graphics.enable32Bit = true; # Replaced 'driSupport32Bit'
hardware.graphics.enable32Bit = true; # Replaced 'driSupport32Bit'
</syntaxhighlight>
</syntaxhighlight>
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systemd.packages = with pkgs; [ lact ];
systemd.packages = with pkgs; [ lact ];
systemd.services.lactd.wantedBy = ["multi-user.target"];
systemd.services.lactd.wantedBy = ["multi-user.target"];
</syntaxhighlight>Simple version is:<syntaxhighlight lang="nix">
</syntaxhighlight>
Simple version is:
<syntaxhighlight lang="nix">
services.lact.enable = true;
services.lact.enable = true;
# https://github.com/NixOS/nixpkgs/blob/nixos-unstable/nixos/modules/services/hardware/lact.nix
# https://github.com/NixOS/nixpkgs/blob/nixos-unstable/nixos/modules/services/hardware/lact.nix
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=== Low resolution during initramfs phase ===
=== Low resolution during initramfs phase ===
If you encounter a low resolution output during early boot phases, you can load the amdgpu module in the initial ramdisk<syntaxhighlight lang="nix">
If you encounter a low resolution output during early boot phases, you can load the amdgpu module in the initial ramdisk
<syntaxhighlight lang="nix">
hardware.amdgpu.initrd.enable = true; # sets boot.initrd.kernelModules = ["amdgpu"];
hardware.amdgpu.initrd.enable = true; # sets boot.initrd.kernelModules = ["amdgpu"];
</syntaxhighlight>
</syntaxhighlight>
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To figure out the connector names, execute the following command while your monitors are connected:
To figure out the connector names, execute the following command while your monitors are connected:


<syntaxhighlight lang="bash">
<syntaxhighlight lang="console">
head /sys/class/drm/*/status
$ head /sys/class/drm/*/status
</syntaxhighlight>
</syntaxhighlight>


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Solution:
Solution:
hardware.firmware = [ pkgs.linux-firmware ];
<syntaxhighlight lang="nix">
hardware.firmware = [ pkgs.linux-firmware ];
</syntaxhighlight>


== See Also ==
== See Also ==
Retrieved from "https://wiki.nixos.org/wiki/AMD_GPU"