[PATCH v2 2/2] perf tests: Add a test for the ARM 32-bit [vectors] page

Florian Fainelli
2018-10-25T17:55:50Z

perf on ARM requires CONFIG_KUSER_HELPERS to be turned on to allow some
independance with respect to the ARM CPU being used. Add a test which
tries to locate the [vectors] page, created when CONFIG_KUSER_HELPERS is
turned on to help asses the system's health.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
tools/perf/arch/arm/tests/Build | 1 +
tools/perf/arch/arm/tests/arch-tests.c | 4 ++++
tools/perf/arch/arm/tests/vectors-page.c | 24 ++++++++++++++++++++++++
tools/perf/tests/tests.h | 5 +++++
4 files changed, 34 insertions(+)
create mode 100644 tools/perf/arch/arm/tests/vectors-page.c

diff --git a/tools/perf/arch/arm/tests/Build b/tools/perf/arch/arm/tests/Build
index 883c57ff0c08..d9ae2733f9cc 100644
--- a/tools/perf/arch/arm/tests/Build
+++ b/tools/perf/arch/arm/tests/Build
@@ -1,4 +1,5 @@
libperf-y += regs_load.o
libperf-y += dwarf-unwind.o
+libperf-y += vectors-page.o

libperf-y += arch-tests.o
diff --git a/tools/perf/arch/arm/tests/arch-tests.c b/tools/perf/arch/arm/tests/arch-tests.c
index 5b1543c98022..6848101a855f 100644
--- a/tools/perf/arch/arm/tests/arch-tests.c
+++ b/tools/perf/arch/arm/tests/arch-tests.c
@@ -10,6 +10,10 @@ struct test arch_tests[] = {
.func = test__dwarf_unwind,
},
#endif
+ {
+ .desc = "Vectors page",
+ .func = test__vectors_page,
+ },
{
.func = NULL,
},
diff --git a/tools/perf/arch/arm/tests/vectors-page.c b/tools/perf/arch/arm/tests/vectors-page.c
new file mode 100644
index 000000000000..7ffdd79971c8
--- /dev/null
+++ b/tools/perf/arch/arm/tests/vectors-page.c
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <stdio.h>
+#include <string.h>
+#include <linux/compiler.h>
+
+#include "debug.h"
+#include "tests/tests.h"
+#include "util/find-map.c"
+
+#define VECTORS__MAP_NAME "[vectors]"
+
+int test__vectors_page(struct test *test __maybe_unused,
+ int subtest __maybe_unused)
+{
+ void *start, *end;
+
+ if (find_map(&start, &end, VECTORS__MAP_NAME)) {
+ pr_err("%s not found, is CONFIG_KUSER_HELPERS enabled?\n",
+ VECTORS__MAP_NAME);
+ return TEST_FAIL;
+ }
+
+ return TEST_OK;
+}
diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h
index b82f55fcc294..399f18ca71a3 100644
--- a/tools/perf/tests/tests.h
+++ b/tools/perf/tests/tests.h
@@ -119,4 +119,9 @@ int test__arch_unwind_sample(struct perf_sample *sample,
struct thread *thread);
#endif
#endif
+
+#if defined(__arm__)
+int test__vectors_page(struct test *test, int subtest);
+#endif
+
#endif /* TESTS_H */
--
2.17.1