[CI] Add "loader" support to conformance testing

This expands our CI to test the loader; the dispatcher that is
used when multiple adapters are availabe.

Previously, the unit tests forced a specific adapter, via
`UR_ADAPTERS_FORCE_LOAD`. Now an extra "loader" target is created
for each test suite, which doesn't set that variable and allows
the loader to be used.

In addition, the test runner's adapter selection logic has been
rewritten to support a "--backend" variable, which allows you to
select a backend (OpenCL, Level Zero, etc.).

The platform selection has also been expanded to support
filtering by a backend to match that platform only on that backend
(e.g. `UR_CTS_ADAPTER_PLATFORM="opencl:Fictional Corp(R)"`).

The old "run on hardware" jobs should behave the same (they have
the loader tests disabled), but there is a new
`combined-opencl-level-zero` job that tests a build with both
OpenCL and Level Zero available.

.github/workflows/build-hw-reusable.yml

@@ -7,13 +7,21 @@ on:
       adapter_name:
         required: true
         type: string
+      other_adapter_name:
+        required: false
+        type: string
+        default: ""
       runner_name:
         required: true
         type: string
       platform:
         required: false
         type: string
         default: ""
+      other_platform:
+        required: false
+        type: string
+        default: ""
       static_loader:
         required: false
         type: string
@@ -39,9 +47,14 @@ jobs:
     if: github.repository == 'oneapi-src/unified-runtime'  # run only on upstream; forks won't have the HW
     strategy:
       matrix:
-        adapter: [
-          {name: "${{inputs.adapter_name}}", platform: "${{inputs.platform}}", static_Loader: "${{inputs.static_loader}}", static_adapter: "${{inputs.static_loader}}"},
-        ]
+        adapter: [{
+          name: "${{inputs.adapter_name}}",
+          other_name: "${{inputs.other_adapter_name}}",
+          platform: "${{inputs.platform}}",
+          other_platform: "${{inputs.other_platform}}",
+          static_Loader: "${{inputs.static_loader}}",
+          static_adapter: "${{inputs.static_loader}}"
+        }]
         build_type: [Debug, Release]
         compiler: [{c: gcc, cxx: g++}, {c: clang, cxx: clang++}]
         # TODO: The latest L0 loader segfaults when built with clang.
@@ -83,10 +96,12 @@ jobs:
         -DUR_DEVELOPER_MODE=ON
         -DUR_BUILD_TESTS=ON
         -DUR_BUILD_ADAPTER_${{matrix.adapter.name}}=ON
+        ${{ matrix.adapter.other_name != '' && format('-DUR_BUILD_ADAPTER_{0}=ON', matrix.adapter.other_name) || '' }}
         -DUR_STATIC_LOADER=${{matrix.adapter.static_Loader}}
         -DUR_STATIC_ADAPTER_${{matrix.adapter.name}}=${{matrix.adapter.static_adapter}}
         -DUR_DPCXX=${{github.workspace}}/dpcpp_compiler/bin/clang++
         -DUR_SYCL_LIBRARY_DIR=${{github.workspace}}/dpcpp_compiler/lib
+        -DUR_CONFORMANCE_TEST_LOADER=${{ matrix.adapter.other_name != '' && 'ON' || 'OFF' }}
         ${{ matrix.adapter.name == 'HIP' && '-DUR_CONFORMANCE_AMD_ARCH=gfx1030' || '' }}
         ${{ matrix.adapter.name == 'HIP' && '-DUR_HIP_PLATFORM=AMD' || '' }}
 
@@ -97,10 +112,12 @@ jobs:
     - name: Test adapter specific
       working-directory: ${{github.workspace}}/build
       run: ctest -C ${{matrix.build_type}} --output-on-failure -L "adapter-specific" --timeout 180
+      # Don't run adapter specific tests when building multiple adapters
+      if: ${{ matrix.adapter.other_name == '' }}
 
     - name: Test adapters
       working-directory: ${{github.workspace}}/build
-      run: env UR_CTS_ADAPTER_PLATFORM="${{matrix.adapter.platform}}" ctest -C ${{matrix.build_type}} --output-on-failure -L "conformance" --timeout 180
+      run: env UR_CTS_ADAPTER_PLATFORM="${{matrix.adapter.name}}:${{matrix.adapter.platform}};${{matrix.adapter.other_name}}:${{matrix.adapter.other_platform}}" ctest -C ${{matrix.build_type}} --output-on-failure -L "conformance" --timeout 180
 
     - name: Get information about platform
       if: ${{ always() }}

.github/workflows/cmake.yml

@@ -186,6 +186,15 @@ jobs:
       adapter_name: NATIVE_CPU
       runner_name: NATIVE_CPU
 
+  combined-opencl-level-zero:
+    name: OpenCL + Level Zero
+    uses: ./.github/workflows/build-hw-reusable.yml
+    with:
+      adapter_name: OPENCL
+      other_adapter_name: L0
+      runner_name: L0
+      platform: "Intel(R) OpenCL"
+
   e2e-level-zero:
     name: E2E L0
     permissions:

.github/workflows/multi_device.yml

@@ -48,6 +48,7 @@ jobs:
         -DUR_DEVELOPER_MODE=ON
         -DUR_BUILD_TESTS=ON
         -DUR_BUILD_ADAPTER_${{matrix.adapter.name}}=ON
+        -DUR_CONFORMANCE_TEST_LOADER=OFF
         -DUR_TEST_DEVICES_COUNT=2
 
     - name: Build

CMakeLists.txt

@@ -68,6 +68,7 @@ set(UR_CONFORMANCE_TARGET_TRIPLES "" CACHE STRING
     "List of sycl targets to build CTS device binaries for")
 set(UR_CONFORMANCE_AMD_ARCH "" CACHE STRING "AMD device target ID to build CTS binaries for")
 option(UR_CONFORMANCE_ENABLE_MATCH_FILES "Enable CTS match files" ON)
+option(UR_CONFORMANCE_TEST_LOADER "Also test the loader in the conformance tests" ON)
 set(UR_ADAPTER_LEVEL_ZERO_SOURCE_DIR "" CACHE PATH
     "Path to external 'level_zero' adapter source dir")
 set(UR_ADAPTER_OPENCL_SOURCE_DIR "" CACHE PATH

scripts/templates/ldrddi.cpp.mako

@@ -40,6 +40,9 @@ namespace ur_loader
         add_local = False
     %>${th.get_initial_null_set(obj)}
 
+        // For testing
+        abort();
+
         [[maybe_unused]] auto context = getContext();
         %if re.match(r"\w+AdapterGet$", th.make_func_name(n, tags, obj)):