[SYCL] Enable level zero v2 in DPC++ (#16656)

This makes a simple way to use the experimental level_zero_v2 in dpc++.
Fixes #16613 .

---------

Co-authored-by: Kenneth Benzie (Benie) <k.benzie@codeplay.com>

Author: omarahmed1111

buildbot/configure.py

@@ -67,7 +67,12 @@ def do_configure(args):
     llvm_enable_zstd = "ON"
 
     if sys.platform != "darwin":
-        sycl_enabled_backends.append("level_zero")
+        # For more info on the enablement of level_zero_v2 refer to this document:
+        # https://github.com/intel/llvm/blob/sycl/unified-runtime/source/adapters/level_zero/v2/README.md
+        if args.level_zero_v2:
+            sycl_enabled_backends.append("level_zero_v2")
+        else:
+            sycl_enabled_backends.append("level_zero")
 
     # lld is needed on Windows or for the HIP adapter on AMD
     if platform.system() == "Windows" or (args.hip and args.hip_platform == "AMD"):
@@ -327,6 +332,9 @@ def main():
         default="AMD",
         help="choose hardware platform for HIP backend",
     )
+    parser.add_argument(
+        "--level_zero_v2", action="store_true", help="Enable SYCL Level Zero V2"
+    )
     parser.add_argument(
         "--host-target",
         default="host",

sycl/CMakeLists.txt

@@ -176,7 +176,7 @@ if ("opencl" IN_LIST SYCL_ENABLE_BACKENDS)
   set(SYCL_BUILD_BACKEND_OPENCL ON)
 endif()
 if ("level_zero" IN_LIST SYCL_ENABLE_BACKENDS)
-  set(SYCL_BUILD_BACKENDLEVEL_ZERO ON)
+  set(SYCL_BUILD_BACKEND_LEVEL_ZERO ON)
 endif()
 if ("native_cpu" IN_LIST SYCL_ENABLE_BACKENDS)
   set(SYCL_BUILD_BACKEND_NATIVE_CPU ON)

sycl/cmake/modules/FetchUnifiedRuntime.cmake

@@ -36,6 +36,9 @@ set(UR_ENABLE_TRACING ON)
 if("level_zero" IN_LIST SYCL_ENABLE_BACKENDS)
   set(UR_BUILD_ADAPTER_L0 ON)
 endif()
+if("level_zero_v2" IN_LIST SYCL_ENABLE_BACKENDS)
+  set(UR_BUILD_ADAPTER_L0_V2 ON)
+endif()
 if("cuda" IN_LIST SYCL_ENABLE_BACKENDS)
   set(UR_BUILD_ADAPTER_CUDA ON)
 endif()
@@ -284,6 +287,10 @@ if("level_zero" IN_LIST SYCL_ENABLE_BACKENDS)
   # added to the new build system
 endif()
 
+if("level_zero_v2" IN_LIST SYCL_ENABLE_BACKENDS)
+  add_sycl_ur_adapter(level_zero_v2)
+endif()
+
 if("cuda" IN_LIST SYCL_ENABLE_BACKENDS)
   add_sycl_ur_adapter(cuda)
 endif()

unified-runtime/source/adapters/level_zero/v2/README.md

@@ -4,6 +4,8 @@ This is the home directory for L0 v2 adapter sources. This is a redesigned versi
 
 L0 v2 adapter can be enabled by setting passing `UR_BUILD_ADAPTER_L0_V2=1` option to cmake. When enabled, `libur_adapter_level_zero_v2.[so|dll]` will be created.
 
+Currently, L0 v2 is only available as an experimental adapter to gather feedback and adding missing features. L0 v2 is planned to be the default adapter for L0 in 2026.0 release.
+
 # Code structure
 
 v2 adapters is is a standalone adapter but reuses some logic from the legacy L0 adapter implementation - most notably: adapter.cpp, platform.cpp, device.cpp