Cycles: oneAPI: Make test kernel more representative

Test kernel will now test functionalities related to kernel execution
with USM memory allocations instead of with SYCL buffers and accessors
as these aren't currently used in the backend.

intern/cycles/kernel/device/oneapi/kernel.cpp

@@ -25,38 +25,57 @@ void oneapi_set_error_cb(OneAPIErrorCallback cb, void *user_ptr)
   s_error_user_ptr = user_ptr;
 }
 
-/* NOTE(@nsirgien): Execution of this simple kernel will check basic functionality and
- * also trigger runtime compilation of all existing oneAPI kernels */
+/* NOTE(@nsirgien): Execution of this simple kernel will check basic functionality like
+ * memory allocations, memory transfers and execution of kernel with USM memory. */
 bool oneapi_run_test_kernel(SyclQueue *queue_)
 {
   assert(queue_);
   sycl::queue *queue = reinterpret_cast<sycl::queue *>(queue_);
-  size_t N = 8;
-  sycl::buffer<float, 1> A(N);
-  sycl::buffer<float, 1> B(N);
-
-  {
-    sycl::host_accessor A_host_acc(A, sycl::write_only);
-    for (size_t i = (size_t)0; i < N; i++)
-      A_host_acc[i] = rand() % 32;
-  }
+  const size_t N = 8;
+  const size_t memory_byte_size = sizeof(int) * N;
 
+  bool is_computation_correct = true;
   try {
-    queue->submit([&](sycl::handler &cgh) {
-      sycl::accessor A_acc(A, cgh, sycl::read_only);
-      sycl::accessor B_acc(B, cgh, sycl::write_only, sycl::no_init);
+    int *A_host = (int *)sycl::aligned_alloc_host(16, memory_byte_size, *queue);
 
-      cgh.parallel_for(N, [=](sycl::id<1> idx) { B_acc[idx] = A_acc[idx] + idx.get(0); });
+    for (size_t i = (size_t)0; i < N; i++) {
+      A_host[i] = rand() % 32;
+    }
+
+    int *A_device = (int *)sycl::malloc_device(memory_byte_size, *queue);
+    int *B_device = (int *)sycl::malloc_device(memory_byte_size, *queue);
+
+    queue->memcpy(A_device, A_host, memory_byte_size);
+    queue->wait_and_throw();
+
+    queue->submit([&](sycl::handler &cgh) {
+      cgh.parallel_for(N, [=](sycl::id<1> idx) { B_device[idx] = A_device[idx] + idx.get(0); });
     });
     queue->wait_and_throw();
 
-    sycl::host_accessor A_host_acc(A, sycl::read_only);
-    sycl::host_accessor B_host_acc(B, sycl::read_only);
+    int *B_host = (int *)sycl::aligned_alloc_host(16, memory_byte_size, *queue);
+
+    queue->memcpy(B_host, B_device, memory_byte_size);
+    queue->wait_and_throw();
 
     for (size_t i = (size_t)0; i < N; i++) {
-      float result = A_host_acc[i] + B_host_acc[i];
-      (void)result;
+      const int expected_result = i + A_host[i];
+      if (B_host[i] != expected_result) {
+        is_computation_correct = false;
+        if (s_error_cb) {
+          s_error_cb(("Incorrect result in test kernel execution -  expected " +
+                      std::to_string(expected_result) + ", got " + std::to_string(B_host[i]))
+                         .c_str(),
+                     s_error_user_ptr);
+        }
+      }
     }
+
+    sycl::free(A_host, *queue);
+    sycl::free(B_host, *queue);
+    sycl::free(A_device, *queue);
+    sycl::free(B_device, *queue);
+    queue->wait_and_throw();
   }
   catch (sycl::exception const &e) {
     if (s_error_cb) {
@@ -65,7 +84,7 @@ bool oneapi_run_test_kernel(SyclQueue *queue_)
     return false;
   }
 
-  return true;
+  return is_computation_correct;
 }
 
 /* TODO: Move device information to OneapiDevice initialized on creation and use it. */