// SPDX-License-Identifier: GPL-2.0-only /* * Copyright 2022, Kajol Jain, 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); /* Instructions */ #define EventCode 0x500fa /* * A perf sampling test for mmcra * field: bhrb_disable. */ static int mmcra_bhrb_disable_test(void) { struct event event; u64 *intr_regs; /* * Check for platform support for the test. * This test is only aplicable on ISA v3.1 */ 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, EventCode); event.attr.sample_regs_intr = platform_extended_mask; event.attr.sample_type |= PERF_SAMPLE_BRANCH_STACK; event.attr.branch_sample_type = PERF_SAMPLE_BRANCH_ANY; event.attr.exclude_kernel = 1; 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)); intr_regs = get_intr_regs(&event, event.mmap_buffer); /* Check for intr_regs */ FAIL_IF(!intr_regs); /* Verify that bhrb_disable bit is set in MMCRA */ FAIL_IF(get_mmcra_bhrb_disable(get_reg_value(intr_regs, "MMCRA"), 5)); event_close(&event); return 0; } int main(void) { return test_harness(mmcra_bhrb_disable_test, "mmcra_bhrb_disable_test"); }