dm: core: Add a way to collect memory usage

Add a function for collecting the amount of memory used by driver model,
including devices, uclasses and attached data and tags.

This information can provide insights into how to reduce the memory
required by driver model. Future work may look at execution speed also.

Signed-off-by: Simon Glass <[email protected]>

1 files changed, 11 insertions, 0 deletions

diff --git a/test/dm/core.c b/test/dm/core.c
index 26e2fd56619..fd4d7569728 100644
--- a/test/dm/core.c
+++ b/test/dm/core.c
@@ -1355,3 +1355,14 @@ static int dm_test_dev_get_attach_bus(struct unit_test_state *uts)
 	return 0;
 }
 DM_TEST(dm_test_dev_get_attach_bus, UT_TESTF_SCAN_FDT);
+
+/* Test getting information about tags attached to bus devices */
+static int dm_test_dev_get_mem(struct unit_test_state *uts)
+{
+	struct dm_stats stats;
+
+	dm_get_mem(&stats);
+
+	return 0;
+}
+DM_TEST(dm_test_dev_get_mem, UT_TESTF_SCAN_FDT);