lib-manager: add support for .bss within data mapping

If the .bss range is within the already mapped .rodata / .data
mapping, we don't need to map it separately.

Signed-off-by: Guennadi Liakhovetski <[email protected]>

src/library_manager/lib_manager.c

@@ -204,9 +204,15 @@ static int lib_manager_allocate_module_instance(uint32_t module_id, uint32_t ins
 	size_t bss_size = ctx->segment_size[SOF_MAN_SEGMENT_BSS];
 	void __sparse_cache *va_base = lib_manager_get_instance_bss_address(module_id,
 									    instance_id, mod);
+	void __sparse_cache *va_base_rodata = (void __sparse_cache *)
+		mod->segment[SOF_MAN_SEGMENT_RODATA].v_base_addr;
+	size_t st_rodata_size = ctx->segment_size[SOF_MAN_SEGMENT_RODATA];
 
-	/* Map bss memory and clear it. */
-	if (lib_manager_align_map(va_base, bss_size, SYS_MM_MEM_PERM_RW) < 0)
+	/* Map .bss memory if it isn't within the "RODATA" block that we've
+	 * already mapped, and clear it. */
+	if ((va_base < va_base_rodata ||
+	     (uint8_t *)va_base >= (uint8_t *)va_base_rodata + st_rodata_size) &&
+	    lib_manager_align_map(va_base, bss_size, SYS_MM_MEM_PERM_RW) < 0)
 		return -ENOMEM;
 
 	memset((__sparse_force void *)va_base, 0, bss_size);
@@ -221,8 +227,15 @@ static int lib_manager_free_module_instance(uint32_t module_id, uint32_t instanc
 	size_t bss_size = ctx->segment_size[SOF_MAN_SEGMENT_BSS];
 	void __sparse_cache *va_base = lib_manager_get_instance_bss_address(module_id,
 									    instance_id, mod);
+	void __sparse_cache *va_base_rodata = (void __sparse_cache *)
+		mod->segment[SOF_MAN_SEGMENT_RODATA].v_base_addr;
+	size_t st_rodata_size = ctx->segment_size[SOF_MAN_SEGMENT_RODATA];
+
+	if (va_base >= va_base_rodata &&
+	    (uint8_t *)va_base < (uint8_t *)va_base_rodata + st_rodata_size)
+		return 0;
 
-	/* Unmap bss memory. */
+	/* Unmap .bss memory. */
 	return lib_manager_align_unmap(va_base, bss_size);
 }