[SYCL][Bindless][UR][L0][E2E] Fix linear interop memory and L0 V1 adapter leaks.

sycl/doc/extensions/experimental/sycl_ext_oneapi_bindless_images.asciidoc

@@ -2150,6 +2150,10 @@ the same way as memory allocated through `alloc_image_mem`,
 operations also work with imported memory mapped to `image_mem_handle` and 
 `void *` types.
 
+An `external_mem` handle can only be mapped to a single `image_mem_handle` or
+`void *` at any one time. Attempting to map a single `external_mem` handle to
+more than one `image_mem_handle` or `void *` is considered undefined behaviour.
+
 When calling `create_image` with an `image_mem_handle` or `void *` mapped from 
 an external memory object, the user must ensure that the image descriptor they 
 pass to `create_image` has members that match or map to those of the external 
@@ -2165,11 +2169,41 @@ the external API. The current supported importable image types are `standard`
 and `mipmap`. Attempting to import other image types will result in undefined 
 behaviour.
 
-Once a user has finished operating on imported memory, they must ensure that 
-they destroy the imported memory handle through `release_external_memory`.
+Once a user has finished operating on mapped memory, they must ensure that they
+unmap that memory.
+
+Memory mapped using `map_external_image_memory` should be unmapped using
+`unmap_external_image_memory`. The `image_type` parameter passed to this
+function must reflect the `image_type` of the image descriptor used when the
+memory was originally mapped. Passing an `image_type` value different to that of
+the value used in the image descriptor when the memory was originally mapped
+will result in undefined behaviour.
 
-`release_external_memory` can only accept `external_mem` objects that were
-created through `import_external_memory`.
+Memory mapped using `map_external_linear_memory` should be unmapped using
+`unmap_external_linear_memory`.
+
+```cpp
+namespace sycl::ext::oneapi::experimental {
+
+void unmap_external_image_memory(image_mem_handle mappedImageMem,
+                                 image_type imageType,
+                                 const sycl::device &syclDevice,
+                                 const sycl::context &syclContext);
+void unmap_external_image_memory(image_mem_handle mappedImageMem,
+                                 image_type imageType,
+                                 const sycl::queue &syclQueue);
+
+void unmap_external_linear_memory(void *mappedLinearMem,
+                                 const sycl::device &syclDevice,
+                                 const sycl::context &syclContext);
+void unmap_external_linear_memory(void *mappedLinearMem,
+                                  const sycl::queue &syclQueue);
+}
+```
+
+Once all memory mapped from a given `external_mem` handle has been unmapped,
+and the user has finished operating on the external memory, they should then
+release the `externa_mem` handle using `release_external_memory`.
 
 ```cpp
 namespace sycl::ext::oneapi::experimental {
@@ -2182,9 +2216,6 @@ void release_external_memory(external_mem externalMem,
 }
 ```
 
-Destroying or freeing any imported memory through `image_mem_free` or 
-`sycl::free` will result in undefined behavior.
-
 === Importing external semaphores [[importing_external_semaphores]]
 
 In addition to proposing importation of external memory resources, we also 

sycl/include/sycl/ext/oneapi/bindless_images.hpp

@@ -285,6 +285,54 @@ __SYCL_EXPORT void release_external_memory(external_mem externalMem,
 __SYCL_EXPORT void release_external_memory(external_mem externalMem,
                                            const sycl::queue &syclQueue);
 
+/**
+ *  @brief   Unmap external linear memory region
+ *
+ *  @param   mappedLinearMem Pointer to the mapped linear memory region to unmap
+ *  @param   syclDevice  The device in which the external memory was created
+ *  @param   syclContext The context in which the external memory was created
+ */
+__SYCL_EXPORT void
+unmap_external_linear_memory(void *mappedLinearMem,
+                             const sycl::device &syclDevice,
+                             const sycl::context &syclContext);
+
+/**
+ *  @brief   Unmap external linear memory region
+ *
+ *  @param   mappedLinearMem Pointer to the mapped linear memory region to unmap
+ *  @param   syclQueue The queue in which the external memory was created
+ */
+inline void unmap_external_linear_memory(void *mappedLinearMem,
+                                         const sycl::queue &syclQueue) {
+  unmap_external_linear_memory(mappedLinearMem, syclQueue.get_device(),
+                               syclQueue.get_context());
+}
+
+/**
+ *  @brief   Unmap external image memory
+ *
+ *  @param   mappedImageMem Handle to the mapped image memory to unmap
+ *  @param   syclDevice  The device in which the external memory was created
+ *  @param   syclContext The context in which the external memory was created
+ */
+__SYCL_EXPORT void unmap_external_image_memory(
+    image_mem_handle mappedImageMem, image_type imageType,
+    const sycl::device &syclDevice, const sycl::context &syclContext);
+
+/**
+ *  @brief   Unmap external image memory
+ *
+ *  @param   mappedImageMem Handle to the mapped image memory to unmap
+ *  @param   syclQueue The queue in which the external memory was created
+ */
+inline void unmap_external_image_memory(image_mem_handle mappedImageMem,
+                                        image_type imageType,
+                                        const sycl::queue &syclQueue) {
+  unmap_external_image_memory(mappedImageMem, imageType, syclQueue.get_device(),
+                              syclQueue.get_context());
+}
+
 /**
  *  @brief   Create an image and return the device image handle
  *

sycl/source/detail/bindless_images.cpp

@@ -546,6 +546,24 @@ __SYCL_EXPORT void release_external_memory(external_mem extMem,
                           syclQueue.get_context());
 }
 
+__SYCL_EXPORT void
+unmap_external_linear_memory(void *mappedLinearRegion,
+                             const sycl::device &syclDevice,
+                             const sycl::context &syclContext) {
+  auto [urDevice, urCtx, Adapter] = get_ur_handles(syclDevice, syclContext);
+
+  Adapter->call<
+      sycl::errc::invalid,
+      sycl::detail::UrApiKind::urBindlessImagesFreeMappedLinearMemoryExp>(
+      urCtx, urDevice, mappedLinearRegion);
+}
+
+__SYCL_EXPORT void unmap_external_image_memory(
+    image_mem_handle mappedImageMem, image_type imageType,
+    const sycl::device &syclDevice, const sycl::context &syclContext) {
+  free_image_mem(mappedImageMem, imageType, syclDevice, syclContext);
+}
+
 template <>
 __SYCL_EXPORT external_semaphore import_external_semaphore(
     external_semaphore_descriptor<resource_fd> externalSemaphoreDesc,