Add support for raw_kernel_arg extension

Author: sommerlukas

dpctl/__init__.py

@@ -49,6 +49,7 @@
 from ._sycl_platform import SyclPlatform, get_platforms, lsplatform
 from ._sycl_queue import (
     LocalAccessor,
+    RawKernelArg,
     SyclKernelInvalidRangeError,
     SyclKernelSubmitError,
     SyclQueue,
@@ -104,6 +105,7 @@
     "SyclQueueCreationError",
     "WorkGroupMemory",
     "LocalAccessor",
+    "RawKernelArg",
 ]
 __all__ += [
     "get_device_cached_queue",

dpctl/_backend.pxd

@@ -70,7 +70,8 @@ cdef extern from "syclinterface/dpctl_sycl_enum_types.h":
         _DOUBLE             'DPCTL_FLOAT64_T',
         _VOID_PTR           'DPCTL_VOID_PTR',
         _LOCAL_ACCESSOR     'DPCTL_LOCAL_ACCESSOR',
-        _WORK_GROUP_MEMORY  'DPCTL_WORK_GROUP_MEMORY'
+        _WORK_GROUP_MEMORY  'DPCTL_WORK_GROUP_MEMORY',
+        _RAW_KERNEL_ARG     'DPCTL_RAW_KERNEL_ARG'
 
     ctypedef enum _queue_property_type 'DPCTLQueuePropertyType':
         _DEFAULT_PROPERTY   'DPCTL_DEFAULT_PROPERTY'
@@ -491,3 +492,16 @@ cdef extern from "syclinterface/dpctl_sycl_extension_interface.h":
         DPCTLSyclWorkGroupMemoryRef Ref);
 
     cdef bint DPCTLWorkGroupMemory_Available();
+
+    cdef struct RawKernelArgDataTy
+    ctypedef RawKernelArgDataTy RawKernelArgData
+
+    cdef struct DPCTLOpaqueRawKernelArg
+    ctypedef DPCTLOpaqueRawKernelArg *DPCTLSyclRawKernelArgRef;
+
+    cdef DPCTLSyclRawKernelArgRef DPCTLRawKernelArg_Create(void* bytes, size_t count);
+
+    cdef void DPCTLRawKernelArg_Delete(
+        DPCTLSyclRawKernelArgRef Ref);
+
+    cdef bint DPCTLRawKernelArg_Available();

dpctl/_sycl_queue.pxd

@@ -20,11 +20,13 @@
 """ This file declares the SyclQueue extension type.
 """
 
+from cpython.buffer cimport Py_buffer
 from libcpp cimport bool as cpp_bool
 
 from ._backend cimport (
     DPCTLSyclDeviceRef,
     DPCTLSyclQueueRef,
+    DPCTLSyclRawKernelArgRef,
     DPCTLSyclWorkGroupMemoryRef,
     _arg_data_type,
 )
@@ -113,3 +115,15 @@ cdef public api class WorkGroupMemory(_WorkGroupMemory) [
     object PyWorkGroupMemoryObject, type PyWorkGroupMemoryType
 ]:
     pass
+
+cdef public api class _RawKernelArg [
+    object Py_RawKernelArgObject, type Py_RawKernelArgType
+]:
+    cdef DPCTLSyclRawKernelArgRef _arg_ref
+    cdef Py_buffer _buf
+    cdef bint _is_buf
+
+cdef public api class RawKernelArg(_RawKernelArg) [
+    object PyRawKernelArgObject, type PyRawKernelArgType
+]:
+    pass

dpctl/_sycl_queue.pyx

@@ -51,6 +51,9 @@ from ._backend cimport (  # noqa: E211
     DPCTLQueue_SubmitNDRange,
     DPCTLQueue_SubmitRange,
     DPCTLQueue_Wait,
+    DPCTLRawKernelArg_Available,
+    DPCTLRawKernelArg_Create,
+    DPCTLRawKernelArg_Delete,
     DPCTLSyclContextRef,
     DPCTLSyclDeviceSelectorRef,
     DPCTLSyclEventRef,
@@ -353,6 +356,15 @@ cdef class _kernel_arg_type:
             _arg_data_type._WORK_GROUP_MEMORY
         )
 
+    @property
+    def dpctl_raw_kernel_arg(self):
+        cdef str p_name = "dpctl_raw_kernel_arg"
+        return kernel_arg_type_attribute(
+            self._name,
+            p_name,
+            _arg_data_type._RAW_KERNEL_ARG
+        )
+
 
 kernel_arg_type = _kernel_arg_type()
 
@@ -958,6 +970,9 @@ cdef class SyclQueue(_SyclQueue):
             elif isinstance(arg, LocalAccessor):
                 kargs[idx] = <void*>((<LocalAccessor>arg).addressof())
                 kargty[idx] = _arg_data_type._LOCAL_ACCESSOR
+            elif isinstance(arg, RawKernelArg):
+                kargs[idx] = <void*>(<size_t>arg._ref)
+                kargty[idx] = _arg_data_type._RAW_KERNEL_ARG
             else:
                 ret = -1
         return ret
@@ -1719,3 +1734,93 @@ cdef class WorkGroupMemory:
         """
         def __get__(self):
             return <size_t>self._mem_ref
+
+
+cdef class _RawKernelArg:
+    def __dealloc(self):
+        if(self._arg_ref):
+            DPCTLRawKernelArg_Delete(self._arg_ref)
+        if(self._is_buf):
+            PyBuffer_Release(&(self._buf))
+
+cdef class RawKernelArg:
+    """
+    RawKernelArg(*args)
+    Python class representing the ``raw_kernel_arg`` class from the Raw Kernel
+    Argument oneAPI SYCL extension for passing binary data as data to kernels.
+
+    This class is intended to be used as kernel argument when launching kernels.
+
+    This is based on a DPC++ SYCL extension and only available in newer
+    versions. Use ``is_available()`` to check availability in your build.
+
+    There are multiple ways to create a ``RawKernelArg``.
+
+    - If the constructor is invoked with just a single argument, this argument
+      is expected to expose the Python buffer interface. The raw kernel arg will
+      be constructed from the data in that buffer.
+
+    - If the constructor is invoked with two arguments, the first argument is
+      interpreted as the number of bytes in the binary argument, while the
+      second argument is interpreted as a pointer to the data. Note that the
+      raw kernel arg does not own or copy the data, so the pointed-to object
+      must be kept alive by the user until kernel launch.
+
+    Args:
+        args:
+            Variadic argument, see class documentation.
+
+    Raises:
+        TypeError: In case of incorrect arguments given to constructurs,
+                   unexpected types of input arguments.
+    """
+    def __cinit__(self, *args):
+        cdef void* ptr = NULL
+        cdef size_t count
+        cdef int ret_code = 0
+
+        if not DPCTLRawKernelArg_Available():
+            raise RuntimeError("Raw kernel arg extension not available")
+
+        if not (0 < len(args) < 3):
+            raise TypeError("RawKernelArg constructor takes 1 or 2 "
+                            f"arguments, but {len(args)} were given")
+
+        if len(args) == 1:
+            if not _is_buffer(args[0]):
+                raise TypeError("RawKernelArg single argument constructor"
+                                "expects argument to be buffer",
+                                f"but got {type(args[0])}")
+
+            ret_code = PyObject_GetBuffer(args[0], &(self._buf), PyBUF_SIMPLE | PyBUF_ANY_CONTIGUOUS)
+            if ret_code != 0: # pragma: no cover
+                raise RuntimeError("Could not access buffer")
+
+            ptr = self._buf.buf
+            count = self._buf.len
+            self._is_buf = True
+        else:
+            if not isinstance(args[0], numbers.Integral):
+                raise TypeError("RawKernelArg constructor expects first"
+                                "argument to be `int`, but got {type(args[0])}")
+            if not isinstance(args[1], numbers.Integral):
+                raise TypeError("RawKernelArg constructor expects second"
+                                "argument to be `int`, but got {type(args[1])}")
+
+            self._is_buf = False
+            count = args[0]
+            ptr = <void*>(<unsigned long long>args[1])
+
+        self._arg_ref = DPCTLRawKernelArg_Create(ptr, count)
+
+    """Check whether the raw_kernel_arg extension is available"""
+    @staticmethod
+    def is_available():
+        return DPCTLRawKernelArg_Available();
+
+    property _ref:
+        """Returns the address of the C API ``DPCTLRawKernelArgRef`` pointer
+        as a ``size_t``.
+        """
+        def __get__(self):
+            return <size_t>self._arg_ref

dpctl/sycl.pxd

@@ -45,6 +45,8 @@ cdef extern from "sycl/sycl.hpp" namespace "sycl":
 cdef extern from "syclinterface/dpctl_sycl_extension_interface.h":
     cdef struct RawWorkGroupMemoryTy
     ctypedef RawWorkGroupMemoryTy RawWorkGroupMemory
+    cdef struct RawKernelArgDataTy
+    ctypedef RawKernelArgDataTy RawKernelArgData
 
 cdef extern from "syclinterface/dpctl_sycl_type_casters.hpp" \
     namespace "dpctl::syclinterface":
@@ -80,3 +82,12 @@ cdef extern from "syclinterface/dpctl_sycl_type_casters.hpp" \
     cdef RawWorkGroupMemory * unwrap_work_group_memory \
             "dpctl::syclinterface::unwrap<RawWorkGroupMemory>" (
             dpctl_backend.DPCTLSyclWorkGroupMemoryRef)
+
+    # raw kernel arg extension
+    cdef dpctl_backend.DPCTLSyclRawKernelArgRef wrap_raw_kernel_arg \
+            "dpctl::syclinterface::wrap<RawKernelArgData>" \
+            (const RawKernelArgData *)
+
+    cdef RawKernelArgData * unwrap_raw_kernel_arg \
+            "dpctl::syclinterface::unwrap<RawKernelArgData>" (
+            dpctl_backend.DPCTLSyclRawKernelArgRef)

dpctl/tests/input_files/raw-arg-kernel.spv

@@ -0,0 +1,112 @@
+#                      Data Parallel Control (dpctl)
+#
+# Copyright 2020-2025 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.
+
+"""Defines unit test cases for the work_group_memory in a SYCL kernel"""
+
+import ctypes
+import os
+
+import pytest
+
+import dpctl
+import dpctl.tensor
+
+
+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 kernel in the SPIR-V file used in this test was generated from the
+# following SYCL source code:
+# #include <sycl/sycl.hpp>
+#
+# using namespace sycl;
+#
+# namespace syclexp = sycl::ext::oneapi::experimental;
+# namespace syclext = sycl::ext::oneapi;
+#
+# using data_t = int32_t;
+#
+# struct Params { data_t mul; data_t add; };
+#
+# extern "C" SYCL_EXTERNAL
+# SYCL_EXT_ONEAPI_FUNCTION_PROPERTY((syclexp::nd_range_kernel<1>))
+# void raw_arg_kernel(data_t* in, data_t* out, Params p){
+#   auto item = syclext::this_work_item::get_nd_item<1>();
+#   size_t global_id = item.get_global_linear_id();
+#   out[global_id] = (in[global_id] * p.mul) + p.add;
+# }
+
+
+class Params(ctypes.Structure):
+    _fields_ = [("mul", ctypes.c_int32), ("add", ctypes.c_int32)]
+
+
+def launch_raw_arg_kernel(raw):
+    if not dpctl.RawKernelArg.is_available():
+        pytest.skip("Raw kernel arg extension not supported")
+
+    try:
+        q = dpctl.SyclQueue("level_zero")
+    except dpctl.SyclQueueCreationError:
+        pytest.skip("LevelZero queue could not be created")
+    spirv_file = get_spirv_abspath("raw-arg-kernel.spv")
+    with open(spirv_file, "br") as spv:
+        spv_bytes = spv.read()
+    prog = dpctl.program.create_program_from_spirv(q, spv_bytes)
+    kernel = prog.get_sycl_kernel("__sycl_kernel_raw_arg_kernel")
+    local_size = 16
+    global_size = local_size * 8
+
+    x = dpctl.tensor.ones(global_size, dtype="int32")
+    y = dpctl.tensor.zeros(global_size, dtype="int32")
+    x.sycl_queue.wait()
+    y.sycl_queue.wait()
+
+    try:
+        q.submit(
+            kernel,
+            [
+                x.usm_data,
+                y.usm_data,
+                raw,
+            ],
+            [global_size],
+            [local_size],
+        )
+        q.wait()
+    except dpctl._sycl_queue.SyclKernelSubmitError:
+        pytest.skip(f"Kernel submission to {q.sycl_device} failed")
+
+    assert dpctl.tensor.all(y == 9)
+
+
+def test_submit_raw_kernel_arg_pointer():
+    paramStruct = Params(4, 5)
+    raw = dpctl.RawKernelArg(
+        ctypes.sizeof(paramStruct), ctypes.addressof(paramStruct)
+    )
+    launch_raw_arg_kernel(raw)
+
+
+def test_submit_raw_kernel_arg_buffer():
+    paramStruct = Params(4, 5)
+    byteArr = bytearray(paramStruct)
+    raw = dpctl.RawKernelArg(byteArr)
+    del byteArr
+    launch_raw_arg_kernel(raw)

dpctl/tests/test_raw_kernel_arg.py

@@ -280,6 +280,7 @@ 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)
+    _check_kernel_arg_type_instance(kernel_arg_type.dpctl_raw_kernel_arg)
 
 
 def get_spirv_abspath(fn):

dpctl/tests/test_sycl_kernel_submit.py

@@ -101,6 +101,7 @@ typedef enum
     DPCTL_VOID_PTR,
     DPCTL_LOCAL_ACCESSOR,
     DPCTL_WORK_GROUP_MEMORY,
+    DPCTL_RAW_KERNEL_ARG,
     DPCTL_UNSUPPORTED_KERNEL_ARG
 } DPCTLKernelArgType;
 

libsyclinterface/include/syclinterface/dpctl_sycl_enum_types.h

@@ -53,4 +53,22 @@ void DPCTLWorkGroupMemory_Delete(__dpctl_take DPCTLSyclWorkGroupMemoryRef Ref);
 DPCTL_API
 bool DPCTLWorkGroupMemory_Available();
 
+typedef struct RawKernelArgDataTy
+{
+    void *bytes;
+    size_t count;
+} RawKernelArgData;
+
+typedef struct DPCTLOpaqueSyclRawKernelArg *DPCTLSyclRawKernelArgRef;
+
+DPCTL_API
+__dpctl_give DPCTLSyclRawKernelArgRef DPCTLRawKernelArg_Create(void *bytes,
+                                                               size_t count);
+
+DPCTL_API
+void DPCTLRawKernelArg_Delete(__dpctl_take DPCTLSyclRawKernelArgRef Ref);
+
+DPCTL_API
+bool DPCTLRawKernelArg_Available();
+
 DPCTL_C_EXTERN_C_END