Add default context

dpctl/_backend.pxd

@@ -278,6 +278,8 @@ cdef extern from "syclinterface/dpctl_sycl_platform_interface.h":
     cdef const char *DPCTLPlatform_GetVendor(const DPCTLSyclPlatformRef)
     cdef const char *DPCTLPlatform_GetVersion(const DPCTLSyclPlatformRef)
     cdef DPCTLPlatformVectorRef DPCTLPlatform_GetPlatforms()
+    cdef DPCTLSyclContextRef DPCTLPlatform_GetDefaultContext(
+        const DPCTLSyclPlatformRef)
 
 
 cdef extern from "syclinterface/dpctl_sycl_context_interface.h":

dpctl/_sycl_device.pyx

@@ -50,6 +50,7 @@ from ._backend cimport (  # noqa: E211
     DPCTLDevice_GetMaxWriteImageArgs,
     DPCTLDevice_GetName,
     DPCTLDevice_GetParentDevice,
+    DPCTLDevice_GetPlatform,
     DPCTLDevice_GetPreferredVectorWidthChar,
     DPCTLDevice_GetPreferredVectorWidthDouble,
     DPCTLDevice_GetPreferredVectorWidthFloat,
@@ -80,6 +81,7 @@ from ._backend cimport (  # noqa: E211
     DPCTLSize_t_Array_Delete,
     DPCTLSyclDeviceRef,
     DPCTLSyclDeviceSelectorRef,
+    DPCTLSyclPlatformRef,
     _aspect_type,
     _backend_type,
     _device_type,
@@ -91,6 +93,8 @@ from .enum_types import backend_type, device_type
 from libc.stdint cimport int64_t, uint32_t
 from libc.stdlib cimport free, malloc
 
+from ._sycl_platform cimport SyclPlatform
+
 import collections
 import warnings
 
@@ -639,6 +643,22 @@ cdef class SyclDevice(_SyclDevice):
             self._device_ref
         )
 
+    @property
+    def platform(self):
+        """ Returns the platform associated with this device.
+
+        Returns:
+            :class:`dpctl.SyclPlatform`: The platform associated with this
+                device.
+        """
+        cdef DPCTLSyclPlatformRef PRef = (
+            DPCTLDevice_GetPlatform(self._device_ref)
+            )
+        if (PRef == NULL):
+            raise RuntimeError("Could not get platform for device.")
+        else:
+            return SyclPlatform._create(PRef)
+
     @property
     def preferred_vector_width_char(self):
         """ Returns the preferred native vector width size for built-in scalar

dpctl/_sycl_platform.pyx

@@ -30,6 +30,7 @@ from ._backend cimport (  # noqa: E211
     DPCTLPlatform_CreateFromSelector,
     DPCTLPlatform_Delete,
     DPCTLPlatform_GetBackend,
+    DPCTLPlatform_GetDefaultContext,
     DPCTLPlatform_GetName,
     DPCTLPlatform_GetPlatforms,
     DPCTLPlatform_GetVendor,
@@ -40,15 +41,19 @@ from ._backend cimport (  # noqa: E211
     DPCTLPlatformVector_GetAt,
     DPCTLPlatformVector_Size,
     DPCTLPlatformVectorRef,
+    DPCTLSyclContextRef,
     DPCTLSyclDeviceSelectorRef,
     DPCTLSyclPlatformRef,
     _backend_type,
 )
 
 import warnings
 
+from ._sycl_context import SyclContextCreationError
 from .enum_types import backend_type
 
+from ._sycl_context cimport SyclContext
+
 __all__ = [
     "get_platforms",
     "lsplatform",
@@ -236,10 +241,10 @@ cdef class SyclPlatform(_SyclPlatform):
 
     @property
     def backend(self):
-        """Returns the backend_type enum value for this device
+        """Returns the backend_type enum value for this platform
 
         Returns:
-            backend_type: The backend for the device.
+            backend_type: The backend for the platform.
         """
         cdef _backend_type BTy = (
             DPCTLPlatform_GetBackend(self._platform_ref)
@@ -255,6 +260,22 @@ cdef class SyclPlatform(_SyclPlatform):
         else:
             raise ValueError("Unknown backend type.")
 
+    @property
+    def default_context(self):
+        """Returns the default platform context for this platform
+
+        Returns:
+            SyclContext: The default context for the platform.
+        """
+        cdef DPCTLSyclContextRef CRef = (
+            DPCTLPlatform_GetDefaultContext(self._platform_ref)
+        )
+
+        if (CRef == NULL):
+            raise
+        else:
+            return SyclContext._create(CRef)
+
 
 def lsplatform(verbosity=0):
     """

dpctl/tests/test_sycl_device.py

@@ -496,6 +496,11 @@ def check_profiling_timer_resolution(device):
     assert isinstance(resol, int) and resol > 0
 
 
+def check_platform(device):
+    p = device.platform
+    assert isinstance(p, dpctl.SyclPlatform)
+
+
 list_of_checks = [
     check_get_max_compute_units,
     check_get_max_work_item_dims,
@@ -552,6 +557,8 @@ def check_profiling_timer_resolution(device):
     check_repr,
     check_get_global_mem_size,
     check_get_local_mem_size,
+    check_profiling_timer_resolution,
+    check_platform,
 ]
 
 

dpctl/tests/test_sycl_platform.py

@@ -87,6 +87,11 @@ def check_repr(platform):
     assert r != ""
 
 
+def check_default_context(platform):
+    r = platform.default_context
+    assert type(r) is dpctl.SyclContext
+
+
 list_of_checks = [
     check_name,
     check_vendor,

libsyclinterface/include/dpctl_sycl_platform_interface.h

@@ -142,4 +142,16 @@ DPCTLPlatform_GetVersion(__dpctl_keep const DPCTLSyclPlatformRef PRef);
 DPCTL_API
 __dpctl_give DPCTLPlatformVectorRef DPCTLPlatform_GetPlatforms(void);
 
+/*!
+ * @brief  Returns a DPCTLSyclContextRef for default platform context.
+ *
+ * @param    PRef           Opaque pointer to a sycl::platform
+ * @return   A DPCTLSyclContextRef value for the default platform associated
+ * with this platform.
+ * @ingroup PlatformInterface
+ */
+DPCTL_API
+__dpctl_give DPCTLSyclContextRef
+DPCTLPlatform_GetDefaultContext(__dpctl_keep const DPCTLSyclPlatformRef PRef);
+
 DPCTL_C_EXTERN_C_END

libsyclinterface/source/dpctl_sycl_platform_interface.cpp

@@ -41,6 +41,7 @@ using namespace cl::sycl;
 namespace
 {
 DEFINE_SIMPLE_CONVERSION_FUNCTIONS(platform, DPCTLSyclPlatformRef);
+DEFINE_SIMPLE_CONVERSION_FUNCTIONS(context, DPCTLSyclContextRef);
 DEFINE_SIMPLE_CONVERSION_FUNCTIONS(device_selector, DPCTLSyclDeviceSelectorRef);
 DEFINE_SIMPLE_CONVERSION_FUNCTIONS(std::vector<DPCTLSyclPlatformRef>,
                                    DPCTLPlatformVectorRef);
@@ -202,3 +203,18 @@ __dpctl_give DPCTLPlatformVectorRef DPCTLPlatform_GetPlatforms()
     // the wrap function is defined inside dpctl_vector_templ.cpp
     return wrap(Platforms);
 }
+
+__dpctl_give DPCTLSyclContextRef
+DPCTLPlatform_GetDefaultContext(__dpctl_keep const DPCTLSyclPlatformRef PRef)
+{
+    auto P = unwrap(PRef);
+    if (P) {
+        auto default_ctx = P->ext_oneapi_get_default_context();
+        return wrap(new context(default_ctx));
+    }
+    else {
+        error_handler("Driver version cannot be looked up for a NULL platform.",
+                      __FILE__, __func__, __LINE__);
+        return nullptr;
+    }
+}

libsyclinterface/tests/test_sycl_platform_interface.cpp

@@ -25,6 +25,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "Support/CBindingWrapping.h"
+#include "dpctl_sycl_context_interface.h"
 #include "dpctl_sycl_device_selector_interface.h"
 #include "dpctl_sycl_platform_interface.h"
 #include "dpctl_sycl_platform_manager.h"
@@ -82,6 +83,16 @@ void check_platform_backend(__dpctl_keep const DPCTLSyclPlatformRef PRef)
     }());
 }
 
+void check_platform_default_context(
+    __dpctl_keep const DPCTLSyclPlatformRef PRef)
+{
+    DPCTLSyclContextRef CRef = nullptr;
+    EXPECT_NO_FATAL_FAILURE(CRef = DPCTLPlatform_GetDefaultContext(PRef));
+    EXPECT_TRUE(CRef != nullptr);
+
+    EXPECT_NO_FATAL_FAILURE(DPCTLContext_Delete(CRef));
+}
+
 } // namespace
 
 struct TestDPCTLSyclPlatformInterface
@@ -167,6 +178,14 @@ TEST_F(TestDPCTLSyclPlatformNull, ChkGetVersion)
     ASSERT_TRUE(version == nullptr);
 }
 
+TEST_F(TestDPCTLSyclPlatformNull, ChkGetDefaultConext)
+{
+    DPCTLSyclContextRef CRef = nullptr;
+
+    EXPECT_NO_FATAL_FAILURE(CRef = DPCTLPlatform_GetDefaultContext(NullPRef));
+    EXPECT_TRUE(CRef == nullptr);
+}
+
 struct TestDPCTLSyclDefaultPlatform : public ::testing::Test
 {
     DPCTLSyclPlatformRef PRef = nullptr;
@@ -207,6 +226,11 @@ TEST_P(TestDPCTLSyclPlatformInterface, ChkGetBackend)
     check_platform_backend(PRef);
 }
 
+TEST_P(TestDPCTLSyclPlatformInterface, ChkGetDefaultContext)
+{
+    check_platform_default_context(PRef);
+}
+
 TEST_P(TestDPCTLSyclPlatformInterface, ChkCopy)
 {
     DPCTLSyclPlatformRef Copied_PRef = nullptr;

libsyclinterface/tests/test_sycl_queue_interface.cpp

@@ -446,7 +446,6 @@ TEST_P(TestDPCTLQueueMemberFunctions, CheckMemset)
 
     ASSERT_NO_FATAL_FAILURE(DPCTLfree_with_queue(p, QRef));
 
-    bool equal = true;
     for (size_t i = 0; i < nbytes; ++i) {
         ASSERT_TRUE(host_arr[i] == val);
     }