[UR][Offload] Use new olMemInfo systems

We no longer track allocations, and `urMemGetInfo` is implemented fully.

Author: RossBrunton

unified-runtime/source/adapters/offload/context.hpp

@@ -29,16 +29,14 @@ struct ur_context_handle_t_ : RefCounted {
   ~ur_context_handle_t_() { urDeviceRelease(Device); }
 
   ur_device_handle_t Device;
-  std::unordered_map<void *, alloc_info_t> AllocTypeMap;
 
-  std::optional<alloc_info_t> getAllocType(const void *UsmPtr) {
-    for (auto &pair : AllocTypeMap) {
-      if (UsmPtr >= pair.first &&
-          reinterpret_cast<uintptr_t>(UsmPtr) <
-              reinterpret_cast<uintptr_t>(pair.first) + pair.second.Size) {
-        return pair.second;
-      }
+  ol_result_t getAllocType(const void *UsmPtr, ol_alloc_type_t &Type) {
+    auto Err = olGetMemInfo(UsmPtr, OL_MEM_INFO_TYPE, sizeof(Type), &Type);
+    if (Err && Err->Code == OL_ERRC_NOT_FOUND) {
+      // Treat unknown allocations as host
+      Type = OL_ALLOC_TYPE_HOST;
+      return OL_SUCCESS;
     }
-    return std::nullopt;
+    return Err;
   }
 };

unified-runtime/source/adapters/offload/enqueue.cpp

@@ -440,17 +440,18 @@ UR_APIEXPORT ur_result_t UR_APICALL urEnqueueUSMMemcpy(
     ur_queue_handle_t hQueue, bool blocking, void *pDst, const void *pSrc,
     size_t size, uint32_t numEventsInWaitList,
     const ur_event_handle_t *phEventWaitList, ur_event_handle_t *phEvent) {
-  auto GetDevice = [&](const void *Ptr) {
-    auto Res = hQueue->UrContext->getAllocType(Ptr);
-    if (!Res)
-      return Adapter->HostDevice;
-    return Res->Type == OL_ALLOC_TYPE_HOST ? Adapter->HostDevice
-                                           : hQueue->OffloadDevice;
-  };
-
-  return doMemcpy(UR_COMMAND_USM_MEMCPY, hQueue, pDst, GetDevice(pDst), pSrc,
-                  GetDevice(pSrc), size, blocking, numEventsInWaitList,
-                  phEventWaitList, phEvent);
+  ol_alloc_type_t DstTy;
+  OL_RETURN_ON_ERR(hQueue->UrContext->getAllocType(pDst, DstTy));
+  ol_device_handle_t Dst =
+      DstTy == OL_ALLOC_TYPE_HOST ? Adapter->HostDevice : hQueue->OffloadDevice;
+
+  ol_alloc_type_t SrcTy;
+  OL_RETURN_ON_ERR(hQueue->UrContext->getAllocType(pSrc, SrcTy));
+  ol_device_handle_t Src =
+      SrcTy == OL_ALLOC_TYPE_HOST ? Adapter->HostDevice : hQueue->OffloadDevice;
+
+  return doMemcpy(UR_COMMAND_USM_MEMCPY, hQueue, pDst, Dst, pSrc, Src, size,
+                  blocking, numEventsInWaitList, phEventWaitList, phEvent);
 
   return UR_RESULT_SUCCESS;
 }

unified-runtime/source/adapters/offload/usm.cpp

@@ -22,9 +22,6 @@ UR_APIEXPORT ur_result_t UR_APICALL urUSMHostAlloc(ur_context_handle_t hContext,
                                                    size_t size, void **ppMem) {
   OL_RETURN_ON_ERR(olMemAlloc(hContext->Device->OffloadDevice,
                               OL_ALLOC_TYPE_HOST, size, ppMem));
-
-  hContext->AllocTypeMap.insert_or_assign(
-      *ppMem, alloc_info_t{OL_ALLOC_TYPE_HOST, size});
   return UR_RESULT_SUCCESS;
 }
 
@@ -33,9 +30,6 @@ UR_APIEXPORT ur_result_t UR_APICALL urUSMDeviceAlloc(
     ur_usm_pool_handle_t, size_t size, void **ppMem) {
   OL_RETURN_ON_ERR(olMemAlloc(hContext->Device->OffloadDevice,
                               OL_ALLOC_TYPE_DEVICE, size, ppMem));
-
-  hContext->AllocTypeMap.insert_or_assign(
-      *ppMem, alloc_info_t{OL_ALLOC_TYPE_DEVICE, size});
   return UR_RESULT_SUCCESS;
 }
 
@@ -44,23 +38,80 @@ UR_APIEXPORT ur_result_t UR_APICALL urUSMSharedAlloc(
     ur_usm_pool_handle_t, size_t size, void **ppMem) {
   OL_RETURN_ON_ERR(olMemAlloc(hContext->Device->OffloadDevice,
                               OL_ALLOC_TYPE_MANAGED, size, ppMem));
-
-  hContext->AllocTypeMap.insert_or_assign(
-      *ppMem, alloc_info_t{OL_ALLOC_TYPE_MANAGED, size});
   return UR_RESULT_SUCCESS;
 }
 
-UR_APIEXPORT ur_result_t UR_APICALL urUSMFree(ur_context_handle_t hContext,
-                                              void *pMem) {
-  hContext->AllocTypeMap.erase(pMem);
+UR_APIEXPORT ur_result_t UR_APICALL urUSMFree(ur_context_handle_t, void *pMem) {
   return offloadResultToUR(olMemFree(pMem));
 }
 
-UR_APIEXPORT ur_result_t UR_APICALL urUSMGetMemAllocInfo(
-    [[maybe_unused]] ur_context_handle_t hContext,
-    [[maybe_unused]] const void *pMem,
-    [[maybe_unused]] ur_usm_alloc_info_t propName,
-    [[maybe_unused]] size_t propSize, [[maybe_unused]] void *pPropValue,
-    [[maybe_unused]] size_t *pPropSizeRet) {
-  return UR_RESULT_ERROR_UNSUPPORTED_FEATURE;
+UR_APIEXPORT ur_result_t UR_APICALL
+urUSMGetMemAllocInfo(ur_context_handle_t hContext, const void *pMem,
+                     ur_usm_alloc_info_t propName, size_t propSize,
+                     void *pPropValue, size_t *pPropSizeRet) {
+  UrReturnHelper ReturnValue(propSize, pPropValue, pPropSizeRet);
+
+  ol_mem_info_t olInfo;
+
+  switch (propName) {
+  case UR_USM_ALLOC_INFO_TYPE:
+    olInfo = OL_MEM_INFO_TYPE;
+    break;
+  case UR_USM_ALLOC_INFO_BASE_PTR:
+    olInfo = OL_MEM_INFO_BASE;
+    break;
+  case UR_USM_ALLOC_INFO_SIZE:
+    olInfo = OL_MEM_INFO_SIZE;
+    break;
+  case UR_USM_ALLOC_INFO_DEVICE:
+    // Contexts can only contain one device
+    return ReturnValue(hContext->Device);
+  case UR_USM_ALLOC_INFO_POOL:
+  default:
+    return UR_RESULT_ERROR_UNSUPPORTED_ENUMERATION;
+    break;
+  }
+
+  if (pPropSizeRet) {
+    OL_RETURN_ON_ERR(olGetMemInfoSize(pMem, olInfo, pPropSizeRet));
+  }
+
+  if (pPropValue) {
+    auto Err = olGetMemInfo(pMem, olInfo, propSize, pPropValue);
+    if (Err && Err->Code == OL_ERRC_NOT_FOUND) {
+      // If the device didn't allocate this object, return default values
+      switch (propName) {
+      case UR_USM_ALLOC_INFO_TYPE:
+        return ReturnValue(UR_USM_TYPE_UNKNOWN);
+      case UR_USM_ALLOC_INFO_BASE_PTR:
+        return ReturnValue(nullptr);
+      case UR_USM_ALLOC_INFO_SIZE:
+        return ReturnValue(0);
+      default:
+        return UR_RESULT_ERROR_UNKNOWN;
+      }
+    }
+    OL_RETURN_ON_ERR(Err);
+
+    if (propName == UR_USM_ALLOC_INFO_TYPE) {
+      auto *OlType = reinterpret_cast<ol_alloc_type_t *>(pPropValue);
+      auto *UrType = reinterpret_cast<ur_usm_type_t *>(pPropValue);
+      switch (*OlType) {
+      case OL_ALLOC_TYPE_HOST:
+        *UrType = UR_USM_TYPE_HOST;
+        break;
+      case OL_ALLOC_TYPE_DEVICE:
+        *UrType = UR_USM_TYPE_DEVICE;
+        break;
+      case OL_ALLOC_TYPE_MANAGED:
+        *UrType = UR_USM_TYPE_SHARED;
+        break;
+      default:
+        *UrType = UR_USM_TYPE_UNKNOWN;
+        break;
+      }
+    }
+  }
+
+  return UR_RESULT_SUCCESS;
 }