add memory partition

Author: softwarecki

src/audio/module_adapter/library/userspace_proxy.c

@@ -276,6 +276,23 @@ static int userspace_proxy_memory_init(struct userspace_context *user_ctx,
 	tr_dbg(&userspace_proxy_tr, "Heap partition %#lx + %zx, attr = %u",
 	       heap_part.start, heap_part.size, heap_part.attr);
 
+	/* When a new memory domain is created, only the "factory" entries from the L2 page
+	 * tables are copied. Memory that was dynamically mapped during firmware execution
+	 * will not be accessible from the new domain. The k_heap structure (drv->user_heap)
+	 * resides in such dynamically mapped memory, so we must explicitly add a partition
+	 * for it to ensure that syscalls can access this structure from the userspace domain.
+	 */
+	struct k_mem_partition heap_struct_part;
+
+	k_mem_region_align(&heap_struct_part.start, &heap_struct_part.size,
+			   POINTER_TO_UINT(drv->user_heap),
+			   sizeof(*drv->user_heap), CONFIG_MM_DRV_PAGE_SIZE);
+	heap_struct_part.attr = K_MEM_PARTITION_P_RW_U_NA |
+		user_get_partition_attr(heap_struct_part.start) | XTENSA_MMU_PERM_W;
+
+	tr_err(&userspace_proxy_tr, "Heap struct partition %#lx + %zx, attr = %u",
+	       heap_struct_part.start, heap_struct_part.size, heap_struct_part.attr);
+
 #if defined(CONFIG_SOF_ZEPHYR_HEAP_CACHED)
 	/* Add cached module private heap to memory partitions */
 	struct k_mem_partition heap_cached_part = {
@@ -298,7 +315,8 @@ static int userspace_proxy_memory_init(struct userspace_context *user_ctx,
 #ifdef CONFIG_SOF_ZEPHYR_HEAP_CACHED
 		&heap_cached_part,
 #endif
-		&heap_part
+		&heap_part,
+		&heap_struct_part
 	};
 
 	tr_dbg(&userspace_proxy_tr, "Common partition %#lx + %zx, attr = %u",