[SYCL] Workaround to support any kernel name for the L0 backend (#1980)

Problem is that currently the L0 driver truncates name of the kernel
when queried from the L0 driver. Problem comes from specification which
allows to accept any kernel name but limits a kernel name which can be
returned by the zeKernelGetProperties function.

Signed-off-by: Artur Gainullin <[email protected]>

Author: againull

sycl/plugins/level_zero/pi_level0.cpp

@@ -1895,7 +1895,7 @@ pi_result piKernelCreate(pi_program Program, const char *KernelName,
                          &ZeKernelDesc, &ZeKernel));
 
   try {
-    auto ZePiKernel = new _pi_kernel(ZeKernel, Program);
+    auto ZePiKernel = new _pi_kernel(ZeKernel, Program, KernelName);
     *RetKernel = pi_cast<pi_kernel>(ZePiKernel);
   } catch (const std::bad_alloc &) {
     return PI_OUT_OF_HOST_MEMORY;
@@ -1961,7 +1961,12 @@ pi_result piKernelGetInfo(pi_kernel Kernel, pi_kernel_info ParamName,
   case PI_KERNEL_INFO_PROGRAM:
     return ReturnValue(pi_program{Kernel->Program});
   case PI_KERNEL_INFO_FUNCTION_NAME:
-    return ReturnValue(ZeKernelProperties.name);
+    // TODO: Replace with the line in the comment once bug in the L0 driver will
+    // be fixed. Problem is that currently L0 driver truncates name of the
+    // returned kernel if it is longer than 256 symbols.
+    //
+    // return ReturnValue(ZeKernelProperties.name);
+    return ReturnValue(Kernel->KernelName.c_str());
   case PI_KERNEL_INFO_NUM_ARGS:
     return ReturnValue(pi_uint32{ZeKernelProperties.numKernelArgs});
   case PI_KERNEL_INFO_REFERENCE_COUNT:

sycl/plugins/level_zero/pi_level0.hpp

@@ -317,14 +317,18 @@ struct _pi_program : _pi_object {
 };
 
 struct _pi_kernel : _pi_object {
-  _pi_kernel(ze_kernel_handle_t Kernel, pi_program Program)
-      : ZeKernel{Kernel}, Program{Program} {}
+  _pi_kernel(ze_kernel_handle_t Kernel, pi_program Program,
+             const char *KernelName)
+      : ZeKernel{Kernel}, Program{Program}, KernelName(KernelName) {}
 
   // L0 function handle.
   ze_kernel_handle_t ZeKernel;
 
   // Keep the program of the kernel.
   pi_program Program;
+
+  // TODO: remove when bug in the L0 runtime will be fixed.
+  std::string KernelName;
 };
 
 struct _pi_sampler : _pi_object {