Add LevelZero variant to hwloc package (#31161)

* Add LevelZero variant to hwloc package

This permits the hwloc package to build with with support for the
Intel Level Zero low-level layer, analogous to CUDA, ROCm, and OpenCL.

* Fix typo

1 files changed, 11 insertions, 0 deletions

diff --git a/var/spack/repos/builtin/packages/hwloc/package.py b/var/spack/repos/builtin/packages/hwloc/package.py
index 2854fa9b7c..ad2325f629 100644
--- a/var/spack/repos/builtin/packages/hwloc/package.py
+++ b/var/spack/repos/builtin/packages/hwloc/package.py
@@ -85,6 +85,8 @@ class Hwloc(AutotoolsPackage):
             description="Support an OpenCL library at run time")
     variant('rocm', default=False,
             description="Support ROCm devices")
+    variant('oneapi-level-zero', default=False,
+            description="Support Intel OneAPI Level Zero devices")
 
     # netloc isn't available until version 2.0.0
     conflicts('+netloc', when="@:1")
@@ -129,6 +131,11 @@ class Hwloc(AutotoolsPackage):
         # variant of llvm-amdgpu depends on hwloc.
         depends_on('llvm-amdgpu~openmp', when='+opencl')
 
+    with when('+oneapi-level-zero'):
+        depends_on('oneapi-level-zero')
+        # oneapi-level-zero isn't available until version 2.5.0
+        conflicts('@:2.4.99', msg='hwloc supports Intel OneAPI Level Zero only since 2.5.0')
+
     @classmethod
     def determine_version(cls, exe):
         output = Executable(exe)('--version', output=str, error=str)
@@ -174,10 +181,14 @@ class Hwloc(AutotoolsPackage):
         args.extend(self.enable_or_disable('libudev'))
         args.extend(self.enable_or_disable('pci'))
         args.extend(self.enable_or_disable('shared'))
+        args.extend(self.enable_or_disable('oneapi-level-zero'))
 
         if '+cuda' in self.spec:
             args.append('--with-cuda={0}'.format(self.spec['cuda'].prefix))
             args.append('--with-cuda-version={0}'.format(
                 self.spec['cuda'].version))
 
+        if '+oneapi-level-zero' in self.spec:
+            args.append('--enable-levelzero')
+
         return args