[llvm] [OFFLOAD] Add plugin with support for Intel oneAPI Level Zero (PR #158900)

[Piotr Balcer via llvm-commits]

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@@ -0,0 +1,134 @@
+//===--- level_zero/dynamic_level_zero/level_zero.cpp ------------- C++ -*-===//
+//
+// Implement wrapper for level_zero API calls through dlopen
+//
+//===----------------------------------------------------------------------===//
+
+#include <level_zero/ze_api.h>
+#include <level_zero/zes_api.h>
+#include <memory>
+
+#include "DLWrap.h"
+#include "Shared/Debug.h"
+#include "llvm/Support/DynamicLibrary.h"
+
+DLWRAP_INITIALIZE()
+
+DLWRAP_INTERNAL(zeInit, 1)
+DLWRAP(zeDriverGet, 2)
+DLWRAP(zeDeviceGet, 3)
+DLWRAP(zeDeviceGetSubDevices, 3)
+DLWRAP(zeModuleCreate, 5)
+DLWRAP(zeModuleGetProperties, 2)
+DLWRAP(zeModuleBuildLogDestroy, 1)
+DLWRAP(zeModuleBuildLogGetString, 3)
+DLWRAP(zeModuleGetKernelNames, 3)
+DLWRAP(zeModuleDestroy, 1)
+DLWRAP(zeCommandListAppendBarrier, 4)
+DLWRAP(zeCommandListAppendLaunchKernel, 6)
+DLWRAP(zeCommandListAppendLaunchCooperativeKernel, 6)
+DLWRAP(zeCommandListAppendMemoryCopy, 7)
+DLWRAP(zeCommandListAppendMemoryCopyRegion, 12)
+DLWRAP(zeCommandListAppendMemoryFill, 8)
+DLWRAP(zeCommandListAppendMemoryPrefetch, 3)
+DLWRAP(zeCommandListAppendMemAdvise, 5)
+DLWRAP(zeCommandListClose, 1)
+DLWRAP(zeCommandListCreate, 4)
+DLWRAP(zeCommandListCreateImmediate, 4)
+DLWRAP(zeCommandListDestroy, 1)
+DLWRAP(zeCommandListReset, 1)
+DLWRAP(zeCommandQueueCreate, 4)
+DLWRAP(zeCommandQueueDestroy, 1)
+DLWRAP(zeCommandQueueExecuteCommandLists, 4)
+DLWRAP(zeCommandQueueSynchronize, 2)
+DLWRAP(zeContextCreate, 3)
+DLWRAP(zeContextDestroy, 1)
+DLWRAP(zeContextMakeMemoryResident, 4)
+DLWRAP(zeDeviceCanAccessPeer, 3)
+DLWRAP(zeDeviceGetProperties, 2)
+DLWRAP(zeDeviceGetCommandQueueGroupProperties, 3)
+DLWRAP(zeDeviceGetComputeProperties, 2)
+DLWRAP(zeDeviceGetMemoryProperties, 3)
+DLWRAP(zeDeviceGetCacheProperties, 3)
+DLWRAP(zeDeviceGetGlobalTimestamps, 3)
+DLWRAP(zeDriverGetApiVersion, 2)
+DLWRAP(zeDriverGetExtensionFunctionAddress, 3)
+DLWRAP(zeDriverGetExtensionProperties, 3)
+DLWRAP(zeEventCreate, 3)
+DLWRAP(zeEventDestroy, 1)
+DLWRAP(zeEventHostReset, 1)
+DLWRAP(zeEventHostSynchronize, 2)
+DLWRAP(zeEventPoolCreate, 5)
+DLWRAP(zeEventPoolDestroy, 1)
+DLWRAP(zeEventQueryKernelTimestamp, 2)
+DLWRAP(zeFenceCreate, 3)
+DLWRAP(zeFenceDestroy, 1)
+DLWRAP(zeFenceHostSynchronize, 2)
+DLWRAP(zeKernelCreate, 3)
+DLWRAP(zeKernelDestroy, 1)
+DLWRAP(zeKernelGetName, 3)
+DLWRAP(zeKernelGetProperties, 2)
+DLWRAP(zeKernelSetArgumentValue, 4)
+DLWRAP(zeKernelSetGroupSize, 4)
+DLWRAP(zeKernelSetIndirectAccess, 2)
+DLWRAP(zeKernelSuggestGroupSize, 7)
+DLWRAP(zeKernelSuggestMaxCooperativeGroupCount, 2)
+DLWRAP(zeMemAllocDevice, 6)
+DLWRAP(zeMemAllocHost, 5)
+DLWRAP(zeMemAllocShared, 7)
+DLWRAP(zeMemFree, 2)
+DLWRAP(zeMemGetAddressRange, 4)
+DLWRAP(zeMemGetAllocProperties, 4)
+DLWRAP(zeModuleDynamicLink, 3)
+DLWRAP(zeModuleGetGlobalPointer, 4)
+DLWRAP(zesDeviceEnumMemoryModules, 3)
+DLWRAP(zesMemoryGetState, 2)
+
+DLWRAP_FINALIZE()
+
+#ifndef LEVEL_ZERO_LIBRARY
+#error "Level zero library not defined"
+#endif
+
+#ifndef TARGET_NAME
+#error "Missing TARGET_NAME macro"
+#endif
+#ifndef DEBUG_PREFIX
+#define DEBUG_PREFIX "TARGET " GETNAME(TARGET_NAME) " RTL"
+#endif
+
+static bool loadLevelZero() {
----------------
pbalcer wrote:

level-zero supports static linking, which will link in a thin shim layer into the application, and then internally dlopen the actual loader/driver library. Using that mechanism would make this whole dynamic wrapper redundant.

https://github.com/llvm/llvm-project/pull/158900