selftests/powerpc: Add test of L3 bank handling

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

2 files changed, 49 insertions, 1 deletions

diff --git a/tools/testing/selftests/powerpc/pmu/Makefile b/tools/testing/selftests/powerpc/pmu/Makefile
index cd256277c24e..ebc0e7449cd9 100644
--- a/tools/testing/selftests/powerpc/pmu/Makefile
+++ b/tools/testing/selftests/powerpc/pmu/Makefile
@@ -1,7 +1,7 @@
 noarg:
         $(MAKE) -C ../
 
-PROGS := count_instructions
+PROGS := count_instructions l3_bank_test
 EXTRA_SOURCES := ../harness.c event.c
 
 SUB_TARGETS = ebb
diff --git a/tools/testing/selftests/powerpc/pmu/l3_bank_test.c b/tools/testing/selftests/powerpc/pmu/l3_bank_test.c
new file mode 100644
index 000000000000..77472f31441e
--- /dev/null
+++ b/tools/testing/selftests/powerpc/pmu/l3_bank_test.c
@@ -0,0 +1,48 @@
+/*
+ * Copyright 2014, Michael Ellerman, IBM Corp.
+ * Licensed under GPLv2.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "event.h"
+#include "utils.h"
+
+#define MALLOC_SIZE     (0x10000 * 10)  /* Ought to be enough .. */
+
+/*
+ * Tests that the L3 bank handling is correct. We fixed it in commit e9aaac1.
+ */
+static int l3_bank_test(void)
+{
+        struct event event;
+        char *p;
+        int i;
+
+        p = malloc(MALLOC_SIZE);
+        FAIL_IF(!p);
+
+        event_init(&event, 0x84918F);
+
+        FAIL_IF(event_open(&event));
+
+        for (i = 0; i < MALLOC_SIZE; i += 0x10000)
+                p[i] = i;
+
+        event_read(&event);
+        event_report(&event);
+
+        FAIL_IF(event.result.running == 0);
+        FAIL_IF(event.result.enabled == 0);
+
+        event_close(&event);
+        free(p);
+
+        return 0;
+}
+
+int main(void)
+{
+        return test_harness(l3_bank_test, "l3_bank_test");
+}