[SYCL] Reject alignment requests > 64KB. (#4263)

This change caps alignment of allocation requests at 64KB. That is the default alignment supported by level_zero, and no other alignments are supported.

Signed-off-by: rdeodhar <rajiv.deodhar@intel.com>

sycl/plugins/level_zero/pi_level_zero.cpp

@@ -6048,6 +6048,11 @@ pi_result piextUSMDeviceAlloc(void **ResultPtr, pi_context Context,
                               pi_device Device,
                               pi_usm_mem_properties *Properties, size_t Size,
                               pi_uint32 Alignment) {
+  // L0 supports alignment up to 64KB and silently ignores higher values.
+  // We flag alignment > 64KB as an invalid value.
+  if (Alignment > 65536)
+    return PI_INVALID_VALUE;
+
   pi_platform Plt = Device->Platform;
   std::unique_lock<std::mutex> ContextsLock(Plt->ContextsMutex,
                                             std::defer_lock);
@@ -6106,6 +6111,11 @@ pi_result piextUSMSharedAlloc(void **ResultPtr, pi_context Context,
                               pi_device Device,
                               pi_usm_mem_properties *Properties, size_t Size,
                               pi_uint32 Alignment) {
+  // L0 supports alignment up to 64KB and silently ignores higher values.
+  // We flag alignment > 64KB as an invalid value.
+  if (Alignment > 65536)
+    return PI_INVALID_VALUE;
+
   pi_platform Plt = Device->Platform;
   std::unique_lock<std::mutex> ContextsLock(Plt->ContextsMutex,
                                             std::defer_lock);
@@ -6162,6 +6172,11 @@ pi_result piextUSMSharedAlloc(void **ResultPtr, pi_context Context,
 pi_result piextUSMHostAlloc(void **ResultPtr, pi_context Context,
                             pi_usm_mem_properties *Properties, size_t Size,
                             pi_uint32 Alignment) {
+  // L0 supports alignment up to 64KB and silently ignores higher values.
+  // We flag alignment > 64KB as an invalid value.
+  if (Alignment > 65536)
+    return PI_INVALID_VALUE;
+
   pi_platform Plt = Context->Devices[0]->Platform;
   std::unique_lock<std::mutex> ContextsLock(Plt->ContextsMutex,
                                             std::defer_lock);