Add wrapper for SYCL queue::memcpy().

backends/include/dppl_sycl_queue_interface.h

@@ -63,4 +63,16 @@ DPPLQueue_GetDevice (__dppl_keep const DPPLSyclQueueRef QRef);
 DPPL_API
 void DPPLQueue_Delete (__dppl_take DPPLSyclQueueRef QRef);
 
+/*!
+ * @brief C-API wrapper for sycl::queue::memcpy. It waits an event.
+ *
+ * @param    QRef           An opaque pointer to the sycl queue.
+ * @param    Dest           An USM pointer to the destination memory.
+ * @param    Src            An USM pointer to the source memory.
+ * @param    Count          A number of bytes to copy.
+ */
+DPPL_API
+void DPPLQueue_Memcpy (__dppl_keep const DPPLSyclQueueRef QRef,
+                       void *Dest, const void *Src, size_t Count);
+
 DPPL_C_EXTERN_C_END

backends/source/dppl_sycl_queue_interface.cpp

@@ -61,3 +61,11 @@ void DPPLQueue_Delete (__dppl_take DPPLSyclQueueRef QRef)
 {
     delete unwrap(QRef);
 }
+
+void DPPLQueue_Memcpy (__dppl_take const DPPLSyclQueueRef QRef,
+                       void *Dest, const void *Src, size_t Count)
+{
+    auto Q = unwrap(QRef);
+    auto event = Q->memcpy(Dest, Src, Count);
+    event.wait();
+}

dpctl/_memory.pxd

@@ -0,0 +1,46 @@
+##===--------------- _memory.pxd - dpctl module --------*- Cython -*-------===##
+##
+##                      Data Parallel Control (dpCtl)
+##
+## Copyright 2020 Intel Corporation
+##
+## Licensed under the Apache License, Version 2.0 (the "License");
+## you may not use this file except in compliance with the License.
+## You may obtain a copy of the License at
+##
+##    http://www.apache.org/licenses/LICENSE-2.0
+##
+## Unless required by applicable law or agreed to in writing, software
+## distributed under the License is distributed on an "AS IS" BASIS,
+## WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+## See the License for the specific language governing permissions and
+## limitations under the License.
+##
+##===----------------------------------------------------------------------===##
+
+# distutils: language = c++
+# cython: language_level=3
+
+from .backend cimport DPPLSyclUSMRef
+from ._sycl_core cimport SyclQueue
+
+
+cdef class Memory:
+    cdef DPPLSyclUSMRef memory_ptr
+    cdef Py_ssize_t nbytes
+    cdef SyclQueue queue
+
+    cdef _cinit(self, Py_ssize_t nbytes, ptr_type, SyclQueue queue)
+    cdef _getbuffer(self, Py_buffer *buffer, int flags)
+
+
+cdef class MemoryUSMShared(Memory):
+    pass
+
+
+cdef class MemoryUSMHost(Memory):
+    pass
+
+
+cdef class MemoryUSMDevice(Memory):
+    pass

dpctl/_memory.pyx

@@ -36,9 +36,6 @@ from cpython cimport Py_buffer
 
 
 cdef class Memory:
-    cdef DPPLSyclUSMRef memory_ptr
-    cdef Py_ssize_t nbytes
-    cdef SyclQueue queue
 
     cdef _cinit(self, Py_ssize_t nbytes, ptr_type, SyclQueue queue):
         cdef DPPLSyclUSMRef p

dpctl/_sycl_core.pxd

@@ -63,3 +63,4 @@ cdef class SyclQueue:
     cpdef SyclContext get_sycl_context (self)
     cpdef SyclDevice get_sycl_device (self)
     cdef DPPLSyclQueueRef get_queue_ref (self)
+    cpdef memcpy (self, dest, src, int count)

dpctl/backend.pxd

@@ -78,6 +78,9 @@ cdef extern from "dppl_sycl_queue_interface.h":
          except+
     cdef DPPLSyclDeviceRef DPPLQueue_GetDevice (const DPPLSyclQueueRef Q) \
          except +
+    cdef void DPPLQueue_Memcpy (const DPPLSyclQueueRef Q,
+                                void *Dest, const void *Src, size_t Count) \
+         except +
 
 
 cdef extern from "dppl_sycl_queue_manager.h":

dpctl/sycl_core.pyx

@@ -29,7 +29,8 @@
 from __future__ import print_function
 from enum import Enum, auto
 import logging
-from dpctl.backend cimport *
+from .backend cimport *
+from ._memory cimport Memory
 
 
 _logger = logging.getLogger(__name__)
@@ -132,6 +133,22 @@ cdef class SyclQueue:
     cdef DPPLSyclQueueRef get_queue_ref (self):
         return self.queue_ptr
 
+    cpdef memcpy (self, dest, src, int count):
+        cdef void *c_dest
+        cdef void *c_src
+
+        if isinstance(dest, Memory):
+            c_dest = <void*>(<Memory>dest).memory_ptr
+        else:
+            raise TypeError("Parameter dest should be Memory.")
+
+        if isinstance(src, Memory):
+            c_src = <void*>(<Memory>src).memory_ptr
+        else:
+            raise TypeError("Parameter src should be Memory.")
+
+        DPPLQueue_Memcpy(self.queue_ptr, c_dest, c_src, count)
+
 
 cdef class _SyclQueueManager:
     def _set_as_current_queue (self, device_ty, device_id):

dpctl/tests/test_sycl_queue_memcpy.py

@@ -0,0 +1,70 @@
+##===---------- test_sycl_queue_manager.py - dpctl  -------*- Python -*----===##
+##
+##                      Data Parallel Control (dpCtl)
+##
+## Copyright 2020 Intel Corporation
+##
+## Licensed under the Apache License, Version 2.0 (the "License");
+## you may not use this file except in compliance with the License.
+## You may obtain a copy of the License at
+##
+##    http://www.apache.org/licenses/LICENSE-2.0
+##
+## Unless required by applicable law or agreed to in writing, software
+## distributed under the License is distributed on an "AS IS" BASIS,
+## WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+## See the License for the specific language governing permissions and
+## limitations under the License.
+##
+##===----------------------------------------------------------------------===##
+###
+### \file
+### Defines unit test cases for the SyclQueue.memcpy in sycl_core.pyx.
+##===----------------------------------------------------------------------===##
+
+import dpctl
+import unittest
+
+
+
+class TestQueueMemcpy (unittest.TestCase):
+
+    def _create_memory (self):
+        nbytes = 1024
+        queue = dpctl.get_current_queue()
+        mobj = dpctl._memory.MemoryUSMShared(nbytes, queue)
+        return mobj
+
+    def test_memcpy_copy_usm_to_usm (self):
+        mobj1 = self._create_memory()
+        mobj2 = self._create_memory()
+        q = dpctl.get_current_queue()
+
+        mv1 = memoryview(mobj1)
+        mv2 = memoryview(mobj2)
+
+        mv1[:3] = b'123'
+
+        q.memcpy(mobj2, mobj1, 3)
+
+        self.assertEqual(mv2[:3], b'123')
+
+    def test_memcpy_type_error (self):
+        mobj = self._create_memory()
+        q = dpctl.get_current_queue()
+
+        with self.assertRaises(TypeError) as cm:
+            q.memcpy(None, mobj, 3)
+
+        self.assertEqual(type(cm.exception), TypeError)
+        self.assertEqual(str(cm.exception), "Parameter dest should be Memory.")
+
+        with self.assertRaises(TypeError) as cm:
+            q.memcpy(mobj, None, 3)
+
+        self.assertEqual(type(cm.exception), TypeError)
+        self.assertEqual(str(cm.exception), "Parameter src should be Memory.")
+
+
+if __name__ == '__main__':
+    unittest.main()

dpctl/tests/test_sycl_usm.py

@@ -78,6 +78,13 @@ def test_memory_gpu_context (self):
             self.assertTrue(usm_type in ['unknown', 'shared'])
 
 
+    def test_buffer_protocol (self):
+        mobj = self._create_memory()
+        mv1 = memoryview(mobj)
+        mv2 = memoryview(mobj)
+        self.assertEqual(mv1, mv2)
+
+
 class TestMemoryUSMBase:
     """ Base tests for MemoryUSM* """
 
@@ -116,5 +123,6 @@ class TestMemoryUSMDevice(TestMemoryUSMBase, unittest.TestCase):
     MemoryUSMClass = MemoryUSMDevice
     usm_type = 'device'
 
+
 if __name__ == '__main__':
     unittest.main()