IntelPython · oleksandr-pavlyk · Apr 8, 2021 · Apr 5, 2021 · Apr 5, 2021 · Apr 5, 2021
@@ -479,3 +479,15 @@ uint32_t DPCTLDevice_GetPreferredVectorWidthDouble(
 DPCTL_API
 uint32_t DPCTLDevice_GetPreferredVectorWidthHalf(
     __dpctl_keep const DPCTLSyclDeviceRef DRef);
+
+/*!
+ * @brief Wrapper over
+ * device.get_info<info::device::parent_device>
+ *
+ * @param    DRef           Opaque pointer to a sycl::device
+ * @return   Returns an opaque pointer to the parent device for a sub-device,
+ * or nullptr otherwise.
+ */
+DPCTL_API
+__dpctl_give DPCTLSyclDeviceRef
+DPCTLDevice_GetParentDevice(__dpctl_keep const DPCTLSyclDeviceRef DRef);
@@ -116,4 +116,15 @@ size_t DPCTLDeviceMgr_GetNumDevices(int device_identifier);
 DPCTL_API
 void DPCTLDeviceMgr_PrintDeviceInfo(__dpctl_keep const DPCTLSyclDeviceRef DRef);
 
+/*!
+ * @brief Gives the index of the given device in the vector returned get_devices
+ * for the platform associated with DRef for the device type of DRef.
+ *
+ * @param    DRef           A #DPCTLSyclDeviceRef opaque pointer.
+ * @ingroup DeviceManager
+ */
+DPCTL_API
+int64_t
+DPCTLDeviceMgr_GetRelativeId(__dpctl_keep const DPCTLSyclDeviceRef DRef);
+
 DPCTL_C_EXTERN_C_END
@@ -549,6 +549,27 @@ uint32_t DPCTLDevice_GetPreferredVectorWidthHalf(
     return vector_width_half;
 }
 
+__dpctl_give DPCTLSyclDeviceRef
+DPCTLDevice_GetParentDevice(__dpctl_keep const DPCTLSyclDeviceRef DRef)
+{
+    auto D = unwrap(DRef);
+    if (D) {
+        try {
+            auto parent_D = D->get_info<info::device::parent_device>();
+            return wrap(new device(parent_D));
+        } catch (invalid_object_error const &ioe) {
+            // not a sub device
+            return nullptr;
+        } catch (runtime_error const &re) {
+            // \todo log error
+            std::cerr << re.what() << '\n';
+            return nullptr;
+        }
+    }
+    else
+        return nullptr;
+}
+
 __dpctl_give DPCTLDeviceVectorRef
 DPCTLDevice_CreateSubDevicesEqually(__dpctl_keep const DPCTLSyclDeviceRef DRef,
                                     size_t count)

@@ -194,3 +194,22 @@ void DPCTLDeviceMgr_PrintDeviceInfo(__dpctl_keep const DPCTLSyclDeviceRef DRef)
         std::cout << "Device is not valid (NULL). Cannot print device info.\n";
     }
 }
+
+int64_t DPCTLDeviceMgr_GetRelativeId(__dpctl_keep const DPCTLSyclDeviceRef DRef)
+{
+    auto Device = unwrap(DRef);
+
+    if (Device) {
+        auto p = Device->get_platform();
+        auto dt = Device->get_info<sycl::info::device::device_type>();
+        auto dev_vec = p.get_devices(dt);
+        int64_t id = 0;
+        for (auto &d_i : dev_vec) {
+            if (*Device == d_i)
+                return id;
+            ++id;
+        }
+        return -1;
+    }
+    return -1;
+}
@@ -330,6 +330,13 @@ TEST_P(TestDPCTLSyclDeviceInterface, Chk_GetImage3dMaxDepth)
         EXPECT_TRUE(image_3d_max_depth >= min_val);
 }
 
+TEST_P(TestDPCTLSyclDeviceInterface, Chk_GetParentDevice)
+{
+    DPCTLSyclDeviceRef pDRef = nullptr;
+    EXPECT_NO_FATAL_FAILURE(pDRef = DPCTLDevice_GetParentDevice(DRef));
+    EXPECT_TRUE(pDRef == nullptr);
+}
+
 INSTANTIATE_TEST_SUITE_P(DPCTLDevice_Fns,
                          TestDPCTLSyclDeviceInterface,
                          ::testing::Values("opencl",

@@ -56,6 +56,13 @@ struct TestDPCTLDeviceManager : public ::testing::TestWithParam<const char *>
     }
 };
 
+TEST_P(TestDPCTLDeviceManager, Chk_GetRelativeId)
+{
+    int64_t rel_id = -1;
+    EXPECT_NO_FATAL_FAILURE(rel_id = DPCTLDeviceMgr_GetRelativeId(DRef));
+    EXPECT_FALSE(rel_id == -1);
+}
+
 TEST_P(TestDPCTLDeviceManager, Chk_PrintDeviceInfo)
 {
     EXPECT_NO_FATAL_FAILURE(DPCTLDeviceMgr_PrintDeviceInfo(DRef));

@@ -81,7 +81,14 @@ TEST_P(TestDPCTLSyclDeviceInterface, Chk_CreateSubDevicesEqually)
         EXPECT_NO_FATAL_FAILURE(
             DVRef = DPCTLDevice_CreateSubDevicesEqually(DRef, count));
         if (DVRef) {
+            DPCTLSyclDeviceRef pDRef = nullptr;
+            DPCTLSyclDeviceRef sDRef = nullptr;
             EXPECT_TRUE(DPCTLDeviceVector_Size(DVRef) > 0);
+            EXPECT_NO_FATAL_FAILURE(sDRef = DPCTLDeviceVector_GetAt(DVRef, 0));
+            EXPECT_NO_FATAL_FAILURE(pDRef = DPCTLDevice_GetParentDevice(sDRef));
+            EXPECT_NO_FATAL_FAILURE(DPCTLDevice_Delete(sDRef));
+            EXPECT_TRUE(DPCTLDevice_AreEq(DRef, pDRef));
+            EXPECT_NO_FATAL_FAILURE(DPCTLDevice_Delete(pDRef));
             EXPECT_NO_FATAL_FAILURE(DPCTLDeviceVector_Delete(DVRef));
         }
     }

@@ -22,7 +22,7 @@ types defined by dpctl's C API.
 """
 
 from libcpp cimport bool
-from libc.stdint cimport uint32_t
+from libc.stdint cimport uint32_t, int64_t
 
 
 cdef extern from "dpctl_error_handler_type.h":
@@ -192,6 +192,7 @@ cdef extern from "dpctl_sycl_device_interface.h":
     cdef DPCTLDeviceVectorRef DPCTLDevice_CreateSubDevicesByAffinity(
         const DPCTLSyclDeviceRef DRef,
         DPCTLPartitionAffinityDomainType PartitionAffinityDomainTy)
+    cdef DPCTLSyclDeviceRef DPCTLDevice_GetParentDevice(const DPCTLSyclDeviceRef DRef)
 
 
 cdef extern from "dpctl_sycl_device_manager.h":
@@ -209,6 +210,7 @@ cdef extern from "dpctl_sycl_device_manager.h":
     cdef void DPCTLDeviceMgr_PrintDeviceInfo(const DPCTLSyclDeviceRef DRef)
     cdef DPCTLSyclContextRef DPCTLDeviceMgr_GetCachedContext(
         const DPCTLSyclDeviceRef DRef)
+    cdef int64_t DPCTLDeviceMgr_GetRelativeId(const DPCTLSyclDeviceRef DRef)
 
 
 cdef extern from "dpctl_sycl_device_selector_interface.h":

@@ -25,10 +25,11 @@ from ._backend cimport (
     DPCTLSyclDeviceSelectorRef,
     _partition_affinity_domain_type
 )
+from libcpp cimport bool as cpp_bool
 
 
 cdef class _SyclDevice:
-    ''' Wrapper class for a Sycl Device
+    ''' Wrapper data owner class for a Sycl Device
     '''
     cdef DPCTLSyclDeviceRef _device_ref
     cdef const char *_vendor_name
@@ -48,3 +49,4 @@ cdef class SyclDevice(_SyclDevice):
     cdef list create_sub_devices_equally(self, size_t count)
     cdef list create_sub_devices_by_counts(self, object counts)
     cdef list create_sub_devices_by_affinity(self, _partition_affinity_domain_type domain)
+    cpdef cpp_bool equals(self, SyclDevice q)
@@ -34,6 +34,7 @@ from ._backend cimport (
     DPCTLDeviceVector_Delete,
     DPCTLDeviceVector_GetAt,
     DPCTLDeviceVector_Size,
+    DPCTLDevice_AreEq,
     DPCTLDevice_GetBackend,
     DPCTLDevice_GetDeviceType,
     DPCTLDevice_GetDriverInfo,
@@ -49,6 +50,7 @@ from ._backend cimport (
     DPCTLDevice_IsGPU,
     DPCTLDevice_IsHost,
     DPCTLDeviceMgr_PrintDeviceInfo,
+    DPCTLDeviceMgr_GetRelativeId,
     DPCTLFilterSelector_Create,
     DPCTLDeviceSelector_Delete,
     DPCTLDeviceSelector_Score,
@@ -74,9 +76,10 @@ from ._backend cimport (
     DPCTLDevice_CreateSubDevicesEqually,
     DPCTLDevice_CreateSubDevicesByCounts,
     DPCTLDevice_CreateSubDevicesByAffinity,
+    DPCTLDevice_GetParentDevice,
 )
 from . import backend_type, device_type
-from libc.stdint cimport uint32_t
+from libc.stdint cimport uint32_t, int64_t
 from libc.stdlib cimport malloc, free
 import warnings
 import collections
@@ -96,7 +99,7 @@ cdef class SubDeviceCreationError(Exception):
 
 
 cdef class _SyclDevice:
-    """ A helper metaclass to abstract a cl::sycl::device instance.
+    """ A helper data-owner class to abstract a cl::sycl::device instance.
     """
 
     def __dealloc__(self):
@@ -124,6 +127,34 @@ cdef list _get_devices(DPCTLDeviceVectorRef DVRef):
     return devices
 
 
+cdef str _backend_type_to_filter_string_part(DPCTLSyclBackendType BTy):
+   if BTy == _backend_type._CUDA:
+       return "cuda"
+   elif BTy == _backend_type._HOST:
+       return "host"
+   elif BTy == _backend_type._LEVEL_ZERO:
+       return "level_zero"
+   elif BTy == _backend_type._OPENCL:
+       return "opencl"
+   else:
+       return "unknown"
+
+
+cdef str _device_type_to_filter_string_part(DPCTLSyclDeviceType DTy):
+   if DTy == _device_type._ACCELERATOR:
+       return "accelerator"
+   elif DTy == _device_type._AUTOMATIC:
+       return "automatic"
+   elif DTy == _device_type._CPU:
+       return "cpu"
+   elif DTy == _device_type._GPU:
+       return "gpu"
+   elif DTy == _device_type._HOST_DEVICE:
+       return "host"
+   else:
+       return "unknown"
+
+
 cdef class SyclDevice(_SyclDevice):
     """ Python equivalent for cl::sycl::device class.
 
@@ -714,3 +745,49 @@ cdef class SyclDevice(_SyclDevice):
                 return self.create_sub_devices_equally(partition)
             except Exception as e:
                 raise TypeError("Unsupported type of sub-device argument")
+
+    @property
+    def parent_device(self):
+        """ Parent device for a sub-device, or None for a root device.
+        """
+        cdef DPCTLSyclDeviceRef pDRef = NULL
+        pDRef = DPCTLDevice_GetParentDevice(self._device_ref)
+        if (pDRef is NULL):
+            return None
+        return SyclDevice._create(pDRef)
+
+    cpdef cpp_bool equals(self, SyclDevice other):
+        """ Returns true if the SyclDevice argument has the same _device_ref
+            as this SyclDevice.
+        """
+        return DPCTLDevice_AreEq(self._device_ref, other.get_device_ref())
+
+    def __eq__(self, other):
+        if isinstance(other, SyclDevice):
+            return self.equals(<SyclDevice> other)
+        else:
+            return False
+
+    @property
+    def filter_string(self):
+        """ For a parent device returns a tuple (backend, device_kind, relative_id).
+            Raises an exception for sub-devices.
+        """
+        cdef DPCTLSyclDeviceRef pDRef = NULL
+        cdef DPCTLSyclBackendType BTy
+        cdef DPCTLSyclDeviceType DTy
+        cdef int64_t relId = -1
+        pDRef = DPCTLDevice_GetParentDevice(self._device_ref)
+        if (pDRef is NULL):
+            BTy = DPCTLDevice_GetBackend(self._device_ref)
+            DTy = DPCTLDevice_GetDeviceType(self._device_ref)
+            relId = DPCTLDeviceMgr_GetRelativeId(self._device_ref)
+            if (relId == -1):
+                raise TypeError("This SyclDevice is not a root device")
+            br_str = _backend_type_to_filter_string_part(BTy)
+            dt_str = _device_type_to_filter_string_part(DTy)
+            return ":".join((br_str, dt_str, str(relId)))
+        else:
+            # this a sub-device, free it, and raise an exception
+            DPCTLDevice_Delete(pDRef)
+            raise TypeError("This SyclDevice is not a root device")