From 50d9c30a685c14e41e44d48a08a08703c680d861 Mon Sep 17 00:00:00 2001 From: Kajol Jain Date: Fri, 10 Jun 2022 19:10:41 +0530 Subject: selftests/powerpc/pmu: Add interface test for mmcra_thresh_cmp fields The testcase uses event code 0x35340401e0 for load only sampling, to verify the settings of thresh compare field in Monitor Mode Control Register A (MMCRA: 9-18 bits for power9 and MMCRA: 8-18 bits for power10). Testcase checks if the thresh compare field is programmed correctly via perf interface to MMCRA register. Signed-off-by: Kajol Jain Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220610134113.62991-4-atrajeev@linux.vnet.ibm.com --- .../pmu/sampling_tests/mmcra_thresh_cmp_test.c | 74 ++++++++++++++++++++++ 1 file changed, 74 insertions(+) create mode 100644 tools/testing/selftests/powerpc/pmu/sampling_tests/mmcra_thresh_cmp_test.c (limited to 'tools/testing/selftests/powerpc/pmu/sampling_tests/mmcra_thresh_cmp_test.c') diff --git a/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcra_thresh_cmp_test.c b/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcra_thresh_cmp_test.c new file mode 100644 index 000000000000..904362f172c9 --- /dev/null +++ b/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcra_thresh_cmp_test.c @@ -0,0 +1,74 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright 2022, Kajol Jain, IBM Corp. + */ + +#include +#include + +#include "../event.h" +#include "misc.h" +#include "utils.h" + +/* + * Primary PMU event used here is PM_MRK_INST_CMPL (0x401e0) + * Threshold event selection used is issue to complete for cycles + * Sampling criteria is Load only sampling + */ +#define p9_EventCode 0x13E35340401e0 +#define p10_EventCode 0x35340401e0 + +extern void thirty_two_instruction_loop_with_ll_sc(u64 loops, u64 *ll_sc_target); + +/* A perf sampling test to test mmcra fields */ +static int mmcra_thresh_cmp(void) +{ + struct event event; + u64 *intr_regs; + u64 dummy; + + /* Check for platform support for the test */ + SKIP_IF(check_pvr_for_sampling_tests()); + + /* Skip for comapt mode */ + SKIP_IF(check_for_compat_mode()); + + /* Init the event for the sampling test */ + if (!have_hwcap2(PPC_FEATURE2_ARCH_3_1)) { + event_init_sampling(&event, p9_EventCode); + } else { + event_init_sampling(&event, p10_EventCode); + event.attr.config1 = 1000; + } + + 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_with_ll_sc(1000000, &dummy); + + 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 thresh cmp match with the corresponding event code fields */ + FAIL_IF(get_thresh_cmp_val(event) != + get_mmcra_thd_cmp(get_reg_value(intr_regs, "MMCRA"), 4)); + + event_close(&event); + return 0; +} + +int main(void) +{ + FAIL_IF(test_harness(mmcra_thresh_cmp, "mmcra_thresh_cmp")); +} -- cgit v1.2.3-59-g8ed1b