// SPDX-License-Identifier: GPL-2.0-only /* * Copyright 2022, Madhavan Srinivasan, IBM Corp. */ #include <signal.h> #include <stdio.h> #include <stdlib.h> #include <sys/types.h> #include "../event.h" #include "misc.h" #include "utils.h" extern void thirty_two_instruction_loop(int loops); static bool is_hv; static void sig_usr2_handler(int signum, siginfo_t *info, void *data) { ucontext_t *uctx = data; is_hv = !!(uctx->uc_mcontext.gp_regs[PT_MSR] & MSR_HV); } /* * A perf sampling test for mmcr2 * fields : fcs, fch. */ static int mmcr2_fcs_fch(void) { struct sigaction sigact = { .sa_sigaction = sig_usr2_handler, .sa_flags = SA_SIGINFO }; struct event event; u64 *intr_regs; FAIL_IF(sigaction(SIGUSR2, &sigact, NULL)); FAIL_IF(kill(getpid(), SIGUSR2)); /* 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, 0x1001e); event.attr.sample_regs_intr = platform_extended_mask; 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)); /* 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 fcs and fch field of MMCR2 match * with corresponding modifier fields. */ if (is_hv) FAIL_IF(event.attr.exclude_kernel != get_mmcr2_fch(get_reg_value(intr_regs, "MMCR2"), 1)); else FAIL_IF(event.attr.exclude_kernel != get_mmcr2_fcs(get_reg_value(intr_regs, "MMCR2"), 1)); event_close(&event); return 0; } int main(void) { return test_harness(mmcr2_fcs_fch, "mmcr2_fcs_fch"); }