From: Athira Rajeev <atraj...@linux.vnet.ibm.com> The testcase uses cycles event to check the PMCCEXT bit setting in Monitor Mode Control Register 0 (MMCR0). Check if perf interface sets this control bit in MMCR0 on ISA v3.1 platform.
Signed-off-by: Athira Rajeev <atraj...@linux.vnet.ibm.com> --- .../powerpc/pmu/sampling_tests/Makefile | 4 +- .../pmu/sampling_tests/mmcr0_pmccext_test.c | 59 +++++++++++++++++++ 2 files changed, 61 insertions(+), 2 deletions(-) create mode 100644 tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr0_pmccext_test.c diff --git a/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile b/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile index 9827bf20b90b..111ecfae5dbe 100644 --- a/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile +++ b/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile @@ -1,7 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 include ../../../../../../scripts/Kbuild.include -all: $(TEST_GEN_PROGS) mmcr0_exceptionbits_test.c mmcr0_cc56run_test.c +all: $(TEST_GEN_PROGS) mmcr0_exceptionbits_test.c mmcr0_cc56run_test.c mmcr0_pmccext_test.c noarg: $(MAKE) -C ../../ @@ -12,7 +12,7 @@ CFLAGS += -m64 -I../../../../../lib/ no-pie-option := $(call try-run, echo 'int main() { return 0; }' | \ $(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -no-pie -x c - -o "$$TMP", -no-pie) -TEST_GEN_PROGS := mmcr0_exceptionbits_test mmcr0_cc56run_test +TEST_GEN_PROGS := mmcr0_exceptionbits_test mmcr0_cc56run_test mmcr0_pmccext_test LDFLAGS += $(no-pie-option) diff --git a/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr0_pmccext_test.c b/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr0_pmccext_test.c new file mode 100644 index 000000000000..c4e6f290d12a --- /dev/null +++ b/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr0_pmccext_test.c @@ -0,0 +1,59 @@ +// 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" + +extern void thirty_two_instruction_loop(int loops); + +/* + * A perf sampling test for mmcr0 + * field: pmccext + */ +static int mmcr0_pmccext(void) +{ + struct event event; + u64 *intr_regs; + + /* Check for platform support for the test */ + SKIP_IF(check_pvr_for_sampling_tests()); + SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_3_1)); + + /* Init the event for the sampling test */ + event_init_sampling(&event, 0x4001e); + event.attr.sample_regs_intr = platform_extended_mask; + FAIL_IF(event_open(&event)); + event.mmap_buffer = event_sample_buf_mmap(event.fd, 1); + + event_enable(&event); + + /* workload to make the event overflow */ + thirty_two_instruction_loop(10000); + + 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 pmccext field is set in MMCR0 */ + FAIL_IF(!GET_MMCR_FIELD(0, get_reg_value(intr_regs, "MMCR0"), 4, pmccext)); + + event_close(&event); + return 0; +} + +int main(void) +{ + FAIL_IF(test_harness(mmcr0_pmccext, "mmcr0_pmccext")); +} -- 2.27.0