[clang] [clang][tools] Add LevelZero support to offload-arch (PR #160570)

[Nick Sarnie via cfe-commits]

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@@ -0,0 +1,128 @@
+//===- LevelZeroArch.cpp - list installed Level Zero devices ---*- C++ -*--===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements a tool for detecting Level Zero devices installed in the
+// system
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef HAVE_LEVEL_ZERO_HEADERS
+
+int printGPUsByLevelZero() { return 0; }
+
+#else
+
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/DynamicLibrary.h"
+#include "llvm/Support/Error.h"
+#include <cstdio>
+#include <level_zero/ze_api.h>
+
+using namespace llvm;
+extern cl::opt<bool> Verbose;
+
+#define DEFINE_WRAPPER(NAME)                                                   \
+  using NAME##_ty = decltype(NAME);                                            \
+  void *NAME##Ptr = nullptr;                                                   \
+  template <class... Ts> ze_result_t NAME##_wrap(Ts... args) {                 \
+    if (!NAME##Ptr) {                                                          \
+      return ZE_RESULT_ERROR_UNKNOWN;                                          \
+    }                                                                          \
+    return reinterpret_cast<NAME##_ty *>(NAME##Ptr)(args...);                  \
+  };
+
+DEFINE_WRAPPER(zeInitDrivers)
+DEFINE_WRAPPER(zeDeviceGet)
+DEFINE_WRAPPER(zeDeviceGetProperties)
+
+static bool loadLevelZero() {
+  const char *L0Library = "libze_loader.so";
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sarnex wrote:

could make this `constexpr const char *` like nvptx does

https://github.com/llvm/llvm-project/pull/160570