| // 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"); |
| } |