regions_mm: Invalidate cache when freeing memory

Platforms based on xtensa have a non-coherent cache between cores. Before releasing a memory block, it is necessary to invalidate the cache. This memory block can be allocated by another core and performing cache writeback by the previous owner will destroy current content of the main memory. Signed-off-by: Adrian Warecki <[email protected]>
thesofproject · Jul 8, 2024 · 1b45a41 · 1b45a41
1 parent 9f9ad33
commit 1b45a41
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/zephyr/lib/regions_mm.c b/zephyr/lib/regions_mm.c
@@ -617,6 +617,12 @@ int vmh_free(struct vmh_heap *heap, void *ptr)
 	if (retval)
 		return retval;
 
+	/* Platforms based on xtensa have a non-coherent cache between cores. Before releasing
+	 * a memory block, it is necessary to invalidate the cache. This memory block can be
+	 * allocated by another core and performing cache writeback by the previous owner will
+	 * destroy current content of the main memory.
+	 */
+	sys_cache_data_invd_range(ptr, size_to_free);
 	return vmh_unmap_region(heap->physical_blocks_allocators[mem_block_iter], ptr,
 				size_to_free);
 }