From 6e11374b08723b2c43ae83bd5d48000d695f13a0 Mon Sep 17 00:00:00 2001 From: Athira Rajeev Date: Thu, 27 Jan 2022 12:50:06 +0530 Subject: [PATCH] selftests/powerpc/pmu/: Add interface test for mmcr0_pmc56 using pmc5 The testcase uses event code 0x500fa to verify the FC5-6 bit setting in Monitor Mode Control Register 0 (MMCR0). Check if FC5-6 bit is not set in MMCR0 when using Performance Monitor Counter 5 and 6 (PMC5 and PMC6). 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/20220127072012.662451-15-kjain@linux.ibm.com --- .../powerpc/pmu/sampling_tests/.gitignore | 1 + .../powerpc/pmu/sampling_tests/Makefile | 2 +- .../sampling_tests/mmcr0_fc56_pmc56_test.c | 58 +++++++++++++++++++ 3 files changed, 60 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr0_fc56_pmc56_test.c diff --git a/tools/testing/selftests/powerpc/pmu/sampling_tests/.gitignore b/tools/testing/selftests/powerpc/pmu/sampling_tests/.gitignore index 3229f088f542..1a3b7323acd1 100644 --- a/tools/testing/selftests/powerpc/pmu/sampling_tests/.gitignore +++ b/tools/testing/selftests/powerpc/pmu/sampling_tests/.gitignore @@ -3,3 +3,4 @@ mmcr0_cc56run_test mmcr0_pmccext_test mmcr0_pmcjce_test mmcr0_fc56_pmc1ce_test +mmcr0_fc56_pmc56_test diff --git a/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile b/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile index b6bc066e5047..790a7ff21a90 100644 --- a/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile +++ b/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile @@ -2,7 +2,7 @@ CFLAGS += -m64 TEST_GEN_PROGS := mmcr0_exceptionbits_test mmcr0_cc56run_test mmcr0_pmccext_test \ - mmcr0_pmcjce_test mmcr0_fc56_pmc1ce_test + mmcr0_pmcjce_test mmcr0_fc56_pmc1ce_test mmcr0_fc56_pmc56_test top_srcdir = ../../../../../.. include ../../../lib.mk diff --git a/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr0_fc56_pmc56_test.c b/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr0_fc56_pmc56_test.c new file mode 100644 index 000000000000..332d24b5ab9c --- /dev/null +++ b/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr0_fc56_pmc56_test.c @@ -0,0 +1,58 @@ +// 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: fc56_pmc56 + */ +static int mmcr0_fc56_pmc56(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 fc56 is not set in MMCR0 when using PMC5 */ + FAIL_IF(get_mmcr0_fc56(get_reg_value(intr_regs, "MMCR0"), 5)); + + event_close(&event); + return 0; +} + +int main(void) +{ + return test_harness(mmcr0_fc56_pmc56, "mmcr0_fc56_pmc56"); +}