test: dm: Support memory leak checking as a core feature

Check the state of the malloc() heap before each test is run, so that tests
can verify that all is well at the end. Provide helper functions to mark
the heap and to check that it returns to its initial state.

Signed-off-by: Simon Glass <sjg@chromium.org>

2 files changed, 32 insertions, 16 deletions

diff --git a/test/dm/core.c b/test/dm/core.c
index b0cfb42c85f..ff5c2a749c5 100644
--- a/test/dm/core.c
+++ b/test/dm/core.c
@@ -67,6 +67,34 @@ static struct driver_info driver_info_pre_reloc = {
 	.platdata = &test_pdata_manual,
 };
 
+void dm_leak_check_start(struct dm_test_state *dms)
+{
+	dms->start = mallinfo();
+	if (!dms->start.uordblks)
+		puts("Warning: Please add '#define DEBUG' to the top of common/dlmalloc.c\n");
+}
+
+int dm_leak_check_end(struct dm_test_state *dms)
+{
+	struct mallinfo end;
+	int id;
+
+	/* Don't delete the root class, since we started with that */
+	for (id = UCLASS_ROOT + 1; id < UCLASS_COUNT; id++) {
+		struct uclass *uc;
+
+		uc = uclass_find(id);
+		if (!uc)
+			continue;
+		ut_assertok(uclass_destroy(uc));
+	}
+
+	end = mallinfo();
+	ut_asserteq(dms->start.uordblks, end.uordblks);
+
+	return 0;
+}
+
 /* Test that binding with platdata occurs correctly */
 static int dm_test_autobind(struct dm_test_state *dms)
 {
@@ -377,14 +405,11 @@ static int dm_test_leak(struct dm_test_state *dms)
 	int i;
 
 	for (i = 0; i < 2; i++) {
-		struct mallinfo start, end;
 		struct udevice *dev;
 		int ret;
 		int id;
 
-		start = mallinfo();
-		if (!start.uordblks)
-			puts("Warning: Please add '#define DEBUG' to the top of common/dlmalloc.c\n");
+		dm_leak_check_start(dms);
 
 		ut_assertok(dm_scan_platdata(false));
 		ut_assertok(dm_scan_fdt(gd->fdt_blob, false));
@@ -398,18 +423,7 @@ static int dm_test_leak(struct dm_test_state *dms)
 			ut_assertok(ret);
 		}
 
-		/* Don't delete the root class, since we started with that */
-		for (id = UCLASS_ROOT + 1; id < UCLASS_COUNT; id++) {
-			struct uclass *uc;
-
-			uc = uclass_find(id);
-			if (!uc)
-				continue;
-			ut_assertok(uclass_destroy(uc));
-		}
-
-		end = mallinfo();
-		ut_asserteq(start.uordblks, end.uordblks);
+		ut_assertok(dm_leak_check_end(dms));
 	}
 
 	return 0;
diff --git a/test/dm/test-main.c b/test/dm/test-main.c
index 94ce72abfd5..90ca81092f7 100644
--- a/test/dm/test-main.c
+++ b/test/dm/test-main.c
@@ -7,6 +7,7 @@
 #include <common.h>
 #include <dm.h>
 #include <errno.h>
+#include <malloc.h>
 #include <dm/test.h>
 #include <dm/root.h>
 #include <dm/uclass-internal.h>
@@ -88,6 +89,7 @@ int dm_test_main(void)
 		printf("Test: %s\n", test->name);
 		ut_assertok(dm_test_init(dms));
 
+		dms->start = mallinfo();
 		if (test->flags & DM_TESTF_SCAN_PDATA)
 			ut_assertok(dm_scan_platdata(false));
 		if (test->flags & DM_TESTF_PROBE_TEST)