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author | Athira Rajeev <atrajeev@linux.vnet.ibm.com> | 2022-06-10 19:10:49 +0530 |
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committer | Michael Ellerman <mpe@ellerman.id.au> | 2022-06-29 08:57:42 +1000 |
commit | 11bbc524390572dfe1bd0375c7e7ab8f9ddf4b34 (patch) | |
tree | 5ab72a81b0f21219a52748e84fc7abe65f433584 /tools/testing/selftests/powerpc/pmu/sampling_tests/intr_regs_no_crash_wo_pmu_test.c | |
parent | selftests/powerpc/pmu: Add selftest to check branch stack enablement will not crash on any platforms (diff) | |
download | linux-dev-11bbc524390572dfe1bd0375c7e7ab8f9ddf4b34.tar.xz linux-dev-11bbc524390572dfe1bd0375c7e7ab8f9ddf4b34.zip |
selftests/powerpc/pmu: Add selftest to check PERF_SAMPLE_REGS_INTR option will not crash on any platforms
With sampling, --intr-regs option is used for capturing
interrupt regs. When --intr-regs option is used, PMU code
uses is_sier_available() function which uses PMU flags in
the code. In environment where platform specific PMU is
not registered, PMU flags is not defined. A fix was added
in kernel to address crash while accessing is_sier_available()
function when pmu is not set. commit f75e7d73bdf7 ("powerpc/perf:
Fix crash with is_sier_available when pmu is not set").
Add perf sampling test to exercise this code and make sure
enabling intr_regs shouldn't crash in any platform. Testcase
uses software event cycles since software event will work even
in cases without PMU.
Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220610134113.62991-12-atrajeev@linux.vnet.ibm.com
Diffstat (limited to '')
-rw-r--r-- | tools/testing/selftests/powerpc/pmu/sampling_tests/intr_regs_no_crash_wo_pmu_test.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/tools/testing/selftests/powerpc/pmu/sampling_tests/intr_regs_no_crash_wo_pmu_test.c b/tools/testing/selftests/powerpc/pmu/sampling_tests/intr_regs_no_crash_wo_pmu_test.c new file mode 100644 index 000000000000..839d2d225da0 --- /dev/null +++ b/tools/testing/selftests/powerpc/pmu/sampling_tests/intr_regs_no_crash_wo_pmu_test.c @@ -0,0 +1,57 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright 2022, Athira Rajeev, IBM Corp. + */ + +#include <stdio.h> +#include <stdlib.h> + +#include "../event.h" +#include "misc.h" +#include "utils.h" + +/* + * A perf sampling test for making sure + * sampling with -intr-regs doesn't crash + * in any environment, say: + * - With generic compat PMU + * - without any PMU registered + * - With platform specific PMU. + * A fix for crash with intr_regs was + * addressed in commit: f75e7d73bdf7 in kernel. + * + * This testcase exercises this code path by doing + * intr_regs using software event. Software event is + * used since s/w event will work even in platform + * without PMU. + */ +static int intr_regs_no_crash_wo_pmu_test(void) +{ + struct event event; + + /* + * Init the event for the sampling test. + * This uses software event which works on + * any platform. + */ + event_init_opts(&event, 0, PERF_TYPE_SOFTWARE, "cycles"); + + event.attr.sample_period = 1000; + event.attr.sample_type = PERF_SAMPLE_REGS_INTR; + event.attr.disabled = 1; + + /* + * Return code of event_open is not considered + * since test just expects no crash from using + * PERF_SAMPLE_REGS_INTR. + */ + event_open(&event); + + event_close(&event); + return 0; +} + +int main(void) +{ + return test_harness(intr_regs_no_crash_wo_pmu_test, "intr_regs_no_crash_wo_pmu_test"); +} |