Revert "[ROCm] [CK] Composable Kernel integration for inductor backend (#158747)"

This reverts commit 019fed39aa6b2dd8c69347378d53423e5efae8d4.

Reverted https://github.com/pytorch/pytorch/pull/158747 on behalf of https://github.com/jithunnair-amd due to Broke linux-binary-manywheel-rocm / manywheel-py3_9-rocm6_4-test: 019fed39aa/1 ... PR didn't have this job run successfully due to CI outage ([comment](https://github.com/pytorch/pytorch/pull/158747#issuecomment-3259212343))

.ci/docker/ci_commit_pins/rocm-composable-kernel.txt

@@ -1 +0,0 @@
-7fe50dc3da2069d6645d9deb8c017a876472a977

setup.py

@@ -324,7 +324,6 @@ from tools.setup_helpers.env import (
     IS_WINDOWS,
 )
 from tools.setup_helpers.generate_linker_script import gen_linker_script
-from tools.setup_helpers.rocm_env import get_ck_dependency_string, IS_ROCM
 
 
 def str2bool(value: str | None) -> bool:
@@ -507,6 +506,7 @@ else:
         sysconfig.get_config_var("LIBDIR")
     ) / sysconfig.get_config_var("INSTSONAME")
 
+
 ################################################################################
 # Version, create_version_file, and package_name
 ################################################################################
@@ -1494,12 +1494,6 @@ def configure_extension_build() -> tuple[
             map(str.strip, pytorch_extra_install_requires.split("|"))
         )
 
-    # Adding extra requirements for ROCm builds
-    if IS_ROCM and platform.system() == "Linux":
-        extra_install_requires.append(
-            f"rocm-composable-kernel {get_ck_dependency_string()}"
-        )
-
     # Cross-compile for M1
     if IS_DARWIN:
         macos_target_arch = os.getenv("CMAKE_OSX_ARCHITECTURES", "")

test/inductor/test_ck_backend.py

@@ -1,4 +1,5 @@
 # Owner(s): ["module: inductor"]
+import functools
 import logging
 import os
 import unittest
@@ -12,7 +13,6 @@ except ImportError:
 import torch
 from torch._inductor import config
 from torch._inductor.test_case import run_tests, TestCase
-from torch._inductor.utils import try_import_ck_lib
 from torch.testing._internal.common_cuda import tf32_off
 from torch.testing._internal.common_utils import (
     instantiate_parametrized_tests,
@@ -32,8 +32,20 @@ if HAS_CUDA_AND_TRITON:
 log = logging.getLogger(__name__)
 
 
-# patch env for tests if needed
+@functools.lru_cache(None)
-_test_env = {}
+def _get_path_without_sccache() -> str:
+    """
+    Get the PATH environment variable without sccache.
+    """
+    path_envs = os.environ.get("PATH", "").split(":")
+    path_envs = [env for env in path_envs if "/opt/cache/bin" not in env]
+    return ":".join(path_envs)
+
+
+_test_env = {
+    "PATH": _get_path_without_sccache(),
+    "DISABLE_SCCACHE": "1",
+}
 
 
 @instantiate_parametrized_tests
@@ -49,10 +61,13 @@ class TestCKBackend(TestCase):
         )
 
         torch.random.manual_seed(1234)
+        try:
+            import ck4inductor  # @manual
 
-        self.ck_dir, _, _, _ = try_import_ck_lib()
+            self.ck_dir = os.path.dirname(ck4inductor.__file__)
-        if not self.ck_dir:
+            os.environ["TORCHINDUCTOR_CK_DIR"] = self.ck_dir
-            raise unittest.SkipTest("Composable Kernel library is not installed")
+        except ImportError as e:
+            raise unittest.SkipTest("Composable Kernel library not installed") from e
 
         try:
             os.environ["INDUCTOR_TEST_DISABLE_FRESH_CACHE"] = "1"
@@ -273,9 +288,6 @@ class TestCKBackend(TestCase):
 
             torch.testing.assert_close(Y_compiled, Y_eager)
 
-    @unittest.skip(
-        "FIXME(tenpercent): kernel compilation errors on gfx942 as of 09/01/25"
-    )
     @unittest.skipIf(not torch.version.hip, "ROCM only")
     @unittest.mock.patch.dict(os.environ, _test_env)
     @parametrize("max_autotune_gemm_backends", ("CK", "ATen,Triton,CK"))

tools/setup_helpers/rocm_env.py

@@ -1,61 +0,0 @@
-import os
-from pathlib import Path
-
-
-def check_if_rocm() -> bool:
-    # If user defines USE_ROCM during PyTorch build, respect their intention
-    use_rocm_env = os.environ.get("USE_ROCM")
-    if use_rocm_env:
-        return bool(use_rocm_env)
-    # otherwise infer existence of ROCm installation as indication of ROCm build
-    rocm_path_env = os.environ.get("ROCM_PATH", "/opt/rocm")
-    if rocm_path_env and os.path.exists(rocm_path_env):
-        return True
-    return False
-
-
-IS_ROCM = check_if_rocm()
-
-SCRIPT_DIR = Path(__file__).parent
-REPO_DIR = SCRIPT_DIR.parent.parent
-
-
-# CK pin is read in a similar way that triton commit is
-def read_ck_pin() -> str:
-    """
-    Reads the CK (Composable Kernel) commit hash.
-    The hash is pinned to a known stable version of CK.
-
-    Returns:
-        str: The commit hash read from 'rocm-composable-kernel.txt'.
-    """
-    ck_file = "rocm-composable-kernel.txt"
-    with open(REPO_DIR / ".ci" / "docker" / "ci_commit_pins" / ck_file) as f:
-        return f.read().strip()
-
-
-# Prepares a dependency string for install_requires in setuptools
-# in specific PEP 508 URL format
-def get_ck_dependency_string() -> str:
-    """
-    Generates a PEP 508-compliant dependency string for the ROCm Composable Kernel
-    to be used in setuptools' install_requires.
-
-    The returned string is EITHER in the format:
-        " @ git+<repo_url>@<commit_hash>#egg=rocm-composable-kernel"
-    where:
-        - <repo_url> is the URL for ROCm Composable Kernel
-        - <commit_hash> is read from the commit pin file
-        - "#egg=rocm-composable-kernel" specifies the package name for setuptools
-    OR an empty string, making use of the existing rocm-composable-kernel installation.
-
-    Returns:
-        str: The formatted dependency string for use in install_requires.
-    """
-    egg_name = "#egg=rocm-composable-kernel"
-    commit_pin = f"@{read_ck_pin()}"
-    if os.getenv("TORCHINDUCTOR_CK_DIR"):
-        # we take non-empty env as an indicator that the package has already been installed and doesn't need to be re-installed
-        # this comes with a caveat that the pinned version is known to work while the preinstalled version might not
-        return ""
-    return f"@ git+https://github.com/ROCm/composable_kernel.git{commit_pin}{egg_name}"

torch/_inductor/codegen/rocm/compile_command.py

@@ -4,7 +4,7 @@ import os
 from typing import Optional
 
 from torch._inductor import config
-from torch._inductor.utils import is_linux, try_import_ck_lib
+from torch._inductor.utils import is_linux
 
 
 log = logging.getLogger(__name__)
@@ -18,23 +18,18 @@ def _rocm_include_paths(dst_file_ext: str) -> list[str]:
         if config.rocm.rocm_home
         else cpp_extension._join_rocm_home("include")
     )
+    if not config.rocm.ck_dir:
+        log.warning("Unspecified Composable Kernel include dir")
 
     if config.is_fbcode():
         from libfb.py import parutil
 
         ck_path = parutil.get_dir_path("composable-kernel-headers")
     else:
-        if not config.rocm.ck_dir:
-            ck_dir, _, _, _ = try_import_ck_lib()
-            if not ck_dir:
-                log.warning("Unspecified Composable Kernel directory")
-            config.rocm.ck_dir = ck_dir
         ck_path = config.rocm.ck_dir or cpp_extension._join_rocm_home(
             "composable_kernel"
         )
 
-    log.debug("Using ck path %s", ck_path)
-
     ck_include = os.path.join(ck_path, "include")
     ck_library_include = os.path.join(ck_path, "library", "include")
 

torch/_inductor/utils.py

@@ -1979,7 +1979,16 @@ def use_ck_template(layout: Layout) -> bool:
         log.warning("Please pip install Composable Kernel package")
         return False
 
-    config.rocm.ck_dir = ck_package_dirname
+    if config.is_fbcode():
+        config.rocm.ck_dir = ck_package_dirname
+
+    if not config.rocm.ck_dir:
+        log.warning("Please set TORCHINDUCTOR_CK_DIR env variable")
+        return False
+
+    if ck_package_dirname != config.rocm.ck_dir:
+        log.warning("Invalid path to CK library")
+        return False
 
     return True