Expose LocalAccessor as kernel argument type

dpctl/__init__.py

@@ -48,6 +48,7 @@
 from ._sycl_event import SyclEvent
 from ._sycl_platform import SyclPlatform, get_platforms, lsplatform
 from ._sycl_queue import (
+    LocalAccessor,
     SyclKernelInvalidRangeError,
     SyclKernelSubmitError,
     SyclQueue,
@@ -102,6 +103,7 @@
     "SyclKernelSubmitError",
     "SyclQueueCreationError",
     "WorkGroupMemory",
+    "LocalAccessor",
 ]
 __all__ += [
     "get_device_cached_queue",

dpctl/_backend.pxd

@@ -362,6 +362,12 @@ cdef extern from "syclinterface/dpctl_sycl_kernel_bundle_interface.h":
 
 
 cdef extern from "syclinterface/dpctl_sycl_queue_interface.h":
+    ctypedef struct _md_local_accessor 'MDLocalAccessor':
+        size_t ndim
+        _arg_data_type dpctl_type_id
+        size_t dim0
+        size_t dim1
+        size_t dim2
     cdef bool DPCTLQueue_AreEq(const DPCTLSyclQueueRef QRef1,
                                const DPCTLSyclQueueRef QRef2)
     cdef DPCTLSyclQueueRef DPCTLQueue_Create(

dpctl/_sycl_queue.pyx

@@ -59,6 +59,7 @@ from ._backend cimport (  # noqa: E211
     DPCTLWorkGroupMemory_Delete,
     _arg_data_type,
     _backend_type,
+    _md_local_accessor,
     _queue_property_type,
 )
 from .memory._memory cimport _Memory
@@ -125,6 +126,95 @@ cdef class kernel_arg_type_attribute:
         return self.attr_value
 
 
+cdef class LocalAccessor:
+    """
+    LocalAccessor(dtype, shape)
+
+    Python class for specifying the dimensionality and type of a
+    ``sycl::local_accessor``, to be used as a kernel argument type.
+
+    Args:
+        dtype (str):
+            the data type of the local memory.
+            The permitted values are
+
+                `'i1'`, `'i2'`, `'i4'`, `'i8'`:
+                    signed integral types int8_t, int16_t, int32_t, int64_t
+                `'u1'`, `'u2'`, `'u4'`, `'u8'`
+                    unsigned integral types uint8_t, uint16_t, uint32_t,
+                    uint64_t
+                `'f4'`, `'f8'`,
+                    single- and double-precision floating-point types float and
+                    double
+        shape (tuple, list):
+            Size of LocalAccessor dimensions. Dimension of the LocalAccessor is
+            determined by the length of the tuple. Must be of length 1, 2, or 3,
+            and contain only non-negative integers.
+
+    Raises:
+        TypeError:
+            If the given shape is not a tuple or list.
+        ValueError:
+            If the given shape sequence is not between one and three elements long.
+        TypeError:
+            If the shape is not a sequence of integers.
+        ValueError:
+            If the shape contains a negative integer.
+        ValueError:
+            If the dtype string is unrecognized.
+    """
+    cdef _md_local_accessor lacc
+
+    def __cinit__(self, str dtype, shape):
+       if not isinstance(shape, (list, tuple)):
+            raise TypeError(f"`shape` must be a list or tuple, got {type(shape)}")
+       ndim = len(shape)
+       if ndim < 1 or ndim > 3:
+            raise ValueError("LocalAccessor must have dimension between one and three")
+       for s in shape:
+            if not isinstance(s, numbers.Integral):
+                raise TypeError("LocalAccessor shape must be a sequence of integers")
+            if s < 0:
+                raise ValueError("LocalAccessor dimensions must be non-negative")
+       self.lacc.ndim = ndim
+       self.lacc.dim0 = <size_t> shape[0]
+       self.lacc.dim1 = <size_t> shape[1] if ndim > 1 else 1
+       self.lacc.dim2 = <size_t> shape[2] if ndim > 2 else 1
+
+       if dtype == 'i1':
+           self.lacc.dpctl_type_id = _arg_data_type._INT8_T
+       elif dtype == 'u1':
+           self.lacc.dpctl_type_id = _arg_data_type._UINT8_T
+       elif dtype == 'i2':
+           self.lacc.dpctl_type_id = _arg_data_type._INT16_T
+       elif dtype == 'u2':
+           self.lacc.dpctl_type_id = _arg_data_type._UINT16_T
+       elif dtype == 'i4':
+           self.lacc.dpctl_type_id = _arg_data_type._INT32_T
+       elif dtype == 'u4':
+           self.lacc.dpctl_type_id = _arg_data_type._UINT32_T
+       elif dtype == 'i8':
+           self.lacc.dpctl_type_id = _arg_data_type._INT64_T
+       elif dtype == 'u8':
+           self.lacc.dpctl_type_id = _arg_data_type._UINT64_T
+       elif dtype == 'f4':
+           self.lacc.dpctl_type_id = _arg_data_type._FLOAT
+       elif dtype == 'f8':
+           self.lacc.dpctl_type_id = _arg_data_type._DOUBLE
+       else:
+           raise ValueError(f"Unrecognized type value: '{dtype}'")
+
+    def __repr__(self):
+        return f"LocalAccessor({self.lacc.ndim})"
+
+    cdef size_t addressof(self):
+        """
+        Returns the address of the _md_local_accessor for this LocalAccessor
+        cast to ``size_t``.
+        """
+        return <size_t>&self.lacc
+
+
 cdef class _kernel_arg_type:
     """
     An enumeration of supported kernel argument types in
@@ -865,6 +955,9 @@ cdef class SyclQueue(_SyclQueue):
             elif isinstance(arg, WorkGroupMemory):
                 kargs[idx] = <void*>(<size_t>arg._ref)
                 kargty[idx] = _arg_data_type._WORK_GROUP_MEMORY
+            elif isinstance(arg, LocalAccessor):
+                kargs[idx] = <void*>((<LocalAccessor>arg).addressof())
+                kargty[idx] = _arg_data_type._LOCAL_ACCESSOR
             else:
                 ret = -1
         return ret

dpctl/tests/test_sycl_kernel_submit.py

@@ -18,6 +18,7 @@
 """
 
 import ctypes
+import os
 
 import numpy as np
 import pytest
@@ -279,3 +280,46 @@ def test_kernel_arg_type():
     _check_kernel_arg_type_instance(kernel_arg_type.dpctl_void_ptr)
     _check_kernel_arg_type_instance(kernel_arg_type.dpctl_local_accessor)
     _check_kernel_arg_type_instance(kernel_arg_type.dpctl_work_group_memory)
+
+
+def get_spirv_abspath(fn):
+    curr_dir = os.path.dirname(os.path.abspath(__file__))
+    spirv_file = os.path.join(curr_dir, "input_files", fn)
+    return spirv_file
+
+
+# the process for generating the .spv files in this test is documented in
+# libsyclinterface/tests/test_sycl_queue_submit_local_accessor_arg.cpp
+# in a comment starting on line 123
+def test_submit_local_accessor_arg():
+    try:
+        q = dpctl.SyclQueue("level_zero")
+    except dpctl.SyclQueueCreationError:
+        pytest.skip("OpenCL queue could not be created")
+    fn = get_spirv_abspath("local_accessor_kernel_inttys_fp32.spv")
+    with open(fn, "br") as f:
+        spirv_bytes = f.read()
+    prog = dpctl_prog.create_program_from_spirv(q, spirv_bytes)
+    krn = prog.get_sycl_kernel("_ZTS14SyclKernel_SLMIlE")
+    lws = 32
+    gws = lws * 10
+    x = dpt.ones(gws, dtype="i8")
+    x.sycl_queue.wait()
+    try:
+        e = q.submit(
+            krn,
+            [x.usm_data, dpctl.LocalAccessor("i8", (lws, 1, 1))],
+            [
+                gws,
+            ],
+            [
+                lws,
+            ],
+        )
+        e.wait()
+    except dpctl._sycl_queue.SyclKernelSubmitError:
+        pytest.skip(f"Kernel submission failed for device {q.sycl_device}")
+    expected = dpt.arange(1, x.size + 1, dtype=x.dtype, device=x.device) * (
+        2 * lws
+    )
+    assert dpt.all(x == expected)