Support CUDA f16 without transformation. (#9207)

- Support f16 from cupy.
- Include CUDA header explicitly.
- Cleanup cmake nvtx support.

cmake/Utils.cmake

@@ -124,13 +124,6 @@ function(format_gencode_flags flags out)
   endif (CMAKE_VERSION VERSION_GREATER_EQUAL "3.18")
 endfunction(format_gencode_flags flags)
 
-macro(enable_nvtx target)
-  find_package(NVTX REQUIRED)
-  target_include_directories(${target} PRIVATE "${NVTX_INCLUDE_DIR}")
-  target_link_libraries(${target} PRIVATE "${NVTX_LIBRARY}")
-  target_compile_definitions(${target} PRIVATE -DXGBOOST_USE_NVTX=1)
-endmacro()
-
 # Set CUDA related flags to target.  Must be used after code `format_gencode_flags`.
 function(xgboost_set_cuda_flags target)
   target_compile_options(${target} PRIVATE
@@ -162,11 +155,14 @@ function(xgboost_set_cuda_flags target)
   endif (USE_DEVICE_DEBUG)
 
   if (USE_NVTX)
-    enable_nvtx(${target})
+    target_compile_definitions(${target} PRIVATE -DXGBOOST_USE_NVTX=1)
   endif (USE_NVTX)
 
   target_compile_definitions(${target} PRIVATE -DXGBOOST_USE_CUDA=1)
-  target_include_directories(${target} PRIVATE ${xgboost_SOURCE_DIR}/gputreeshap)
+  target_include_directories(
+    ${target} PRIVATE
+    ${xgboost_SOURCE_DIR}/gputreeshap
+    ${CUDAToolkit_INCLUDE_DIRS})
 
   if (MSVC)
     target_compile_options(${target} PRIVATE
@@ -289,7 +285,7 @@ macro(xgboost_target_link_libraries target)
   endif (USE_NCCL)
 
   if (USE_NVTX)
-    enable_nvtx(${target})
+    target_link_libraries(${target} PRIVATE CUDA::nvToolsExt)
   endif (USE_NVTX)
 
   if (RABIT_BUILD_MPI)

cmake/modules/FindNVTX.cmake

@@ -1,26 +0,0 @@
-if (NVTX_LIBRARY)
-  unset(NVTX_LIBRARY CACHE)
-endif (NVTX_LIBRARY)
-
-set(NVTX_LIB_NAME nvToolsExt)
-
-
-find_path(NVTX_INCLUDE_DIR
-  NAMES nvToolsExt.h
-  PATHS ${CUDA_HOME}/include ${CUDA_INCLUDE} /usr/local/cuda/include)
-
-
-find_library(NVTX_LIBRARY
-  NAMES nvToolsExt
-  PATHS ${CUDA_HOME}/lib64 /usr/local/cuda/lib64)
-
-message(STATUS "Using nvtx library: ${NVTX_LIBRARY}")
-
-include(FindPackageHandleStandardArgs)
-find_package_handle_standard_args(NVTX DEFAULT_MSG
-                                  NVTX_INCLUDE_DIR NVTX_LIBRARY)
-
-mark_as_advanced(
-  NVTX_INCLUDE_DIR
-  NVTX_LIBRARY
-)