Copy from/to multidimensional buffers

dpctl/_sycl_queue.pyx

@@ -65,7 +65,15 @@ import ctypes
 from .enum_types import backend_type
 
 from cpython cimport pycapsule
-from cpython.buffer cimport PyObject_CheckBuffer
+from cpython.buffer cimport (
+    Py_buffer,
+    PyBUF_ANY_CONTIGUOUS,
+    PyBUF_SIMPLE,
+    PyBUF_WRITABLE,
+    PyBuffer_Release,
+    PyObject_CheckBuffer,
+    PyObject_GetBuffer,
+)
 from cpython.ref cimport Py_DECREF, Py_INCREF, PyObject
 from libc.stdlib cimport free, malloc
 
@@ -338,14 +346,20 @@ cdef DPCTLSyclEventRef _memcpy_impl(
     cdef void *c_dst_ptr = NULL
     cdef void *c_src_ptr = NULL
     cdef DPCTLSyclEventRef ERef = NULL
-    cdef const unsigned char[::1] src_host_buf = None
-    cdef unsigned char[::1] dst_host_buf = None
+    cdef Py_buffer src_buf_view
+    cdef Py_buffer dst_buf_view
+    cdef bint src_is_buf = False
+    cdef bint dst_is_buf = False
+    cdef int ret_code = 0
 
     if isinstance(src, _Memory):
         c_src_ptr = <void*>(<_Memory>src).get_data_ptr()
     elif _is_buffer(src):
-        src_host_buf = src
-        c_src_ptr = <void *>&src_host_buf[0]
+        ret_code = PyObject_GetBuffer(src, &src_buf_view, PyBUF_SIMPLE | PyBUF_ANY_CONTIGUOUS)
+        if ret_code != 0: # pragma: no cover
+            raise RuntimeError("Could not access buffer")
+        c_src_ptr = src_buf_view.buf
+        src_is_buf = True
     else:
         raise TypeError(
              "Parameter `src` should have either type "
@@ -356,8 +370,13 @@ cdef DPCTLSyclEventRef _memcpy_impl(
     if isinstance(dst, _Memory):
         c_dst_ptr = <void*>(<_Memory>dst).get_data_ptr()
     elif _is_buffer(dst):
-        dst_host_buf = dst
-        c_dst_ptr = <void *>&dst_host_buf[0]
+        ret_code = PyObject_GetBuffer(dst, &dst_buf_view, PyBUF_SIMPLE | PyBUF_ANY_CONTIGUOUS | PyBUF_WRITABLE)
+        if ret_code != 0: # pragma: no cover
+            if src_is_buf:
+                PyBuffer_Release(&src_buf_view)
+            raise RuntimeError("Could not access buffer")
+        c_dst_ptr = dst_buf_view.buf
+        dst_is_buf = True
     else:
         raise TypeError(
              "Parameter `dst` should have either type "
@@ -376,6 +395,12 @@ cdef DPCTLSyclEventRef _memcpy_impl(
             dep_events,
             dep_events_count
         )
+
+    if src_is_buf:
+        PyBuffer_Release(&src_buf_view)
+    if dst_is_buf:
+        PyBuffer_Release(&dst_buf_view)
+
     return ERef
 
 

dpctl/tests/test_sycl_queue_memcpy.py

@@ -17,6 +17,7 @@
 """Defines unit test cases for the SyclQueue.memcpy.
 """
 
+import numpy as np
 import pytest
 
 import dpctl
@@ -97,6 +98,44 @@ def test_memcpy_copy_host_to_host():
     assert dst_buf == src_buf
 
 
+def test_2D_memcpy_copy_host_to_usm():
+    try:
+        q = dpctl.SyclQueue()
+    except dpctl.SyclQueueCreationError:
+        pytest.skip("Default constructor for SyclQueue failed")
+    usm_obj = _create_memory(q)
+
+    n = 12
+    canary = bytearray([i for i in range(n)])
+    host_obj = np.frombuffer(canary, dtype=np.uint8).reshape(3, 4)
+
+    q.memcpy(usm_obj, host_obj, len(canary))
+
+    mv2 = memoryview(usm_obj)
+
+    assert mv2[: len(canary)] == canary
+
+
+def test_2D_memcpy_copy_usm_to_host():
+    try:
+        q = dpctl.SyclQueue()
+    except dpctl.SyclQueueCreationError:
+        pytest.skip("Default constructor for SyclQueue failed")
+    usm_obj = _create_memory(q)
+    mv2 = memoryview(usm_obj)
+
+    n = 12
+    shape = (3, 4)
+    for id in range(n):
+        mv2[id] = id
+
+    host_obj = np.ones(shape, dtype=np.uint8)
+
+    q.memcpy(host_obj, usm_obj, n)
+
+    assert np.array_equal(host_obj, np.arange(n, dtype=np.uint8).reshape(shape))
+
+
 def test_memcpy_async():
     try:
         q = dpctl.SyclQueue()