From eb7aa044df18c6f7a88bc17fc4c9f4524652a290 Mon Sep 17 00:00:00 2001 From: Athira Rajeev Date: Thu, 27 Jan 2022 12:50:01 +0530 Subject: selftests/powerpc/pmu/: Add interface test for mmcr0 exception bits The testcase uses "instructions" event to verify two bits(PMAE and PMAO) in Monitor Mode Control Register 0 (MMCR0). At the time of interrupt, pmae bit ( which enables performance monitor exception ) is expected to be cleared and pmao (which indicates performance monitor alert) bit is expected to be set in MMCR0. And testcases handles these checks. Signed-off-by: Athira Rajeev [mpe: Add error checking, drop GET_MMCR_FIELD, add to .gitignore] Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220127072012.662451-10-kjain@linux.ibm.com --- .../powerpc/pmu/sampling_tests/.gitignore | 1 + .../selftests/powerpc/pmu/sampling_tests/Makefile | 4 +- .../pmu/sampling_tests/mmcr0_exceptionbits_test.c | 59 ++++++++++++++++++++++ 3 files changed, 63 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/powerpc/pmu/sampling_tests/.gitignore create mode 100644 tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr0_exceptionbits_test.c (limited to 'tools/testing/selftests/powerpc') diff --git a/tools/testing/selftests/powerpc/pmu/sampling_tests/.gitignore b/tools/testing/selftests/powerpc/pmu/sampling_tests/.gitignore new file mode 100644 index 000000000000..067b9f3a7f84 --- /dev/null +++ b/tools/testing/selftests/powerpc/pmu/sampling_tests/.gitignore @@ -0,0 +1 @@ +mmcr0_exceptionbits_test diff --git a/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile b/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile index ac3d03ffc428..c81db8b553f6 100644 --- a/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile +++ b/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile @@ -1,7 +1,9 @@ # SPDX-License-Identifier: GPL-2.0 CFLAGS += -m64 +TEST_GEN_PROGS := mmcr0_exceptionbits_test + top_srcdir = ../../../../../.. include ../../../lib.mk -$(TEST_GEN_PROGS): ../../harness.c ../../utils.c ../event.c ../lib.c misc.c misc.h +$(TEST_GEN_PROGS): ../../harness.c ../../utils.c ../event.c ../lib.c misc.c misc.h ../loop.S diff --git a/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr0_exceptionbits_test.c b/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr0_exceptionbits_test.c new file mode 100644 index 000000000000..982aa56d2171 --- /dev/null +++ b/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr0_exceptionbits_test.c @@ -0,0 +1,59 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright 2022, Athira Rajeev, IBM Corp. + */ + +#include +#include + +#include "../event.h" +#include "misc.h" +#include "utils.h" + +extern void thirty_two_instruction_loop(int loops); + +/* + * A perf sampling test for mmcr0 + * fields : pmae, pmao. + */ +static int mmcr0_exceptionbits(void) +{ + struct event event; + u64 *intr_regs; + + /* Check for platform support for the test */ + SKIP_IF(check_pvr_for_sampling_tests()); + + /* Init the event for the sampling test */ + event_init_sampling(&event, 0x500fa); + event.attr.sample_regs_intr = platform_extended_mask; + FAIL_IF(event_open(&event)); + event.mmap_buffer = event_sample_buf_mmap(event.fd, 1); + + FAIL_IF(event_enable(&event)); + + /* workload to make the event overflow */ + thirty_two_instruction_loop(10000); + + FAIL_IF(event_disable(&event)); + + /* Check for sample count */ + FAIL_IF(!collect_samples(event.mmap_buffer)); + + intr_regs = get_intr_regs(&event, event.mmap_buffer); + + /* Check for intr_regs */ + FAIL_IF(!intr_regs); + + /* Verify that pmae is cleared and pmao is set in MMCR0 */ + FAIL_IF(get_mmcr0_pmae(get_reg_value(intr_regs, "MMCR0"), 5)); + FAIL_IF(!get_mmcr0_pmao(get_reg_value(intr_regs, "MMCR0"), 5)); + + event_close(&event); + return 0; +} + +int main(void) +{ + return test_harness(mmcr0_exceptionbits, "mmcr0_exceptionbits"); +} -- cgit v1.2.3-59-g8ed1b