From 06e8add5c50bcecae1c3c5fdbde39503970a16ec Mon Sep 17 00:00:00 2001
From: Gaetan Lepage <gaetan@glepage.com>
Date: Thu, 9 Apr 2026 11:49:09 +0000
Subject: [PATCH] python3Packages.deep-gemm: init at 2.1.1.post3

---
 .../python-modules/deep-gemm/default.nix      | 110 ++++++++++++++++++
 .../deep-gemm/use-system-libraries.patch      |  54 +++++++++
 pkgs/top-level/python-packages.nix            |   2 +
 3 files changed, 166 insertions(+)
 create mode 100644 pkgs/development/python-modules/deep-gemm/default.nix
 create mode 100644 pkgs/development/python-modules/deep-gemm/use-system-libraries.patch

diff --git a/pkgs/development/python-modules/deep-gemm/default.nix b/pkgs/development/python-modules/deep-gemm/default.nix
new file mode 100644
index 000000000000..6c873f09ea20
--- /dev/null
+++ b/pkgs/development/python-modules/deep-gemm/default.nix
@@ -0,0 +1,110 @@
+{
+  lib,
+  buildPythonPackage,
+  fetchFromGitHub,
+
+  # build-system
+  setuptools,
+  torch,
+
+  # buildInputs
+  fmt,
+  pybind11,
+
+  # nativeBuildInputs
+  autoAddDriverRunpath,
+
+  # tests
+  pytestCheckHook,
+  writableTmpDirAsHomeHook,
+
+  # passthru
+  deep-gemm,
+
+  config,
+  cudaPackages,
+  cudaSupport ? config.cudaSupport,
+}:
+
+let
+  inherit (lib)
+    getBin
+    optionalAttrs
+    optionals
+    ;
+in
+buildPythonPackage.override { inherit (torch) stdenv; } (finalAttrs: {
+  pname = "deep-gemm";
+  version = "2.1.1.post3";
+  pyproject = true;
+
+  src = fetchFromGitHub {
+    owner = "deepseek-ai";
+    repo = "DeepGEMM";
+    tag = "v${finalAttrs.version}";
+    hash = "sha256-2yEHiuTaNUodWlZk7waqBsVMip2qiVJPgQHwsY0I63k=";
+  };
+
+  patches = [
+    ./use-system-libraries.patch
+  ];
+
+  env = optionalAttrs cudaSupport {
+    CUDA_HOME = (getBin cudaPackages.cuda_nvcc).outPath;
+
+    LDFLAGS = toString [
+      # Fake libcuda.so (the real one is deployed impurely)
+      "-L${lib.getOutput "stubs" cudaPackages.cuda_cudart}/lib/stubs"
+    ];
+  };
+
+  build-system = [
+    setuptools
+    torch
+  ];
+
+  nativeBuildInputs = [
+    autoAddDriverRunpath
+  ];
+
+  buildInputs = [
+    fmt
+    pybind11
+  ]
+  ++ optionals cudaSupport (
+    with cudaPackages;
+    [
+      cuda_cudart # cuda_runtime_api.h
+      cuda_nvrtc # nvrtc.h
+      cutlass # cute/arch/mma_sm100_desc.hpp
+      libcublas # cublas_v2.h
+      libcusolver # cusolverDn.h
+      libcusparse # cusparse.h
+    ]
+  );
+
+  nativeCheckInputs = [
+    pytestCheckHook
+    writableTmpDirAsHomeHook
+  ];
+
+  # Tests require GPU access
+  doCheck = false;
+
+  passthru.gpuCheck = deep-gemm.overridePythonAttrs {
+    requiredSystemFeatures = [ "cuda" ];
+
+    # dlopens libcuda.so at import time
+    pythonImportsCheck = [ "deep_gemm" ];
+
+    doCheck = true;
+  };
+
+  meta = {
+    description = "Clean and efficient FP8 GEMM kernels with fine-grained scaling";
+    homepage = "https://github.com/deepseek-ai/DeepGEMM";
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ GaetanLepage ];
+    broken = !cudaSupport;
+  };
+})
diff --git a/pkgs/development/python-modules/deep-gemm/use-system-libraries.patch b/pkgs/development/python-modules/deep-gemm/use-system-libraries.patch
new file mode 100644
index 000000000000..c65daa26fd6b
--- /dev/null
+++ b/pkgs/development/python-modules/deep-gemm/use-system-libraries.patch
@@ -0,0 +1,54 @@
+diff --git a/setup.py b/setup.py
+index 38e891c..e846847 100644
+--- a/setup.py
++++ b/setup.py
+@@ -14,7 +14,7 @@ from setuptools import find_packages
+ from setuptools.command.build_py import build_py
+ from packaging.version import parse
+ from pathlib import Path
+-from torch.utils.cpp_extension import CUDAExtension, CUDA_HOME
++from torch.utils.cpp_extension import CUDAExtension
+ from wheel.bdist_wheel import bdist_wheel as _bdist_wheel
+ 
+ 
+@@ -33,20 +33,10 @@ if DG_JIT_USE_RUNTIME_API:
+ current_dir = os.path.dirname(os.path.realpath(__file__))
+ sources = ['csrc/python_api.cpp']
+ build_include_dirs = [
+-    f'{CUDA_HOME}/include',
+-    f'{CUDA_HOME}/include/cccl',
+     'deep_gemm/include',
+-    'third-party/cutlass/include',
+-    'third-party/fmt/include',
+ ]
+ build_libraries = ['cuda', 'cudart', 'nvrtc']
+ build_library_dirs = [
+-    f'{CUDA_HOME}/lib64',
+-    f'{CUDA_HOME}/lib64/stubs'
+-]
+-third_party_include_dirs = [
+-    'third-party/cutlass/include/cute',
+-    'third-party/cutlass/include/cutlass',
+ ]
+ 
+ # Release
+@@ -142,19 +132,6 @@ class CustomBuildPy(build_py):
+         build_include_dir = os.path.join(self.build_lib, 'deep_gemm/include')
+         os.makedirs(build_include_dir, exist_ok=True)
+ 
+-        # Copy third-party includes to the build directory
+-        for d in third_party_include_dirs:
+-            dirname = d.split('/')[-1]
+-            src_dir = os.path.join(current_dir, d)
+-            dst_dir = os.path.join(build_include_dir, dirname)
+-
+-            # Remove existing directory if it exists
+-            if os.path.exists(dst_dir):
+-                shutil.rmtree(dst_dir)
+-
+-            # Copy the directory
+-            shutil.copytree(src_dir, dst_dir)
+-
+ 
+ class CachedWheelsCommand(_bdist_wheel):
+     def run(self):
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index e21a14733ed8..91208e3b4e53 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -3748,6 +3748,8 @@ self: super: with self; {
 
   deep-ep = callPackage ../development/python-modules/deep-ep { };
 
+  deep-gemm = callPackage ../development/python-modules/deep-gemm { };
+
   deep-translator = callPackage ../development/python-modules/deep-translator { };
 
   deepdiff = callPackage ../development/python-modules/deepdiff { };