1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2022, Madhavan Srinivasan, IBM Corp. 4 */ 5 6 #include <signal.h> 7 #include <stdio.h> 8 #include <stdlib.h> 9 #include <sys/types.h> 10 11 #include "../event.h" 12 #include "misc.h" 13 #include "utils.h" 14 15 extern void thirty_two_instruction_loop(int loops); 16 17 static bool is_hv; 18 19 static void sig_usr2_handler(int signum, siginfo_t *info, void *data) 20 { 21 ucontext_t *uctx = data; 22 23 is_hv = !!(uctx->uc_mcontext.gp_regs[PT_MSR] & MSR_HV); 24 } 25 26 /* 27 * A perf sampling test for mmcr2 28 * fields : fcs, fch. 29 */ 30 static int mmcr2_fcs_fch(void) 31 { 32 struct sigaction sigact = { 33 .sa_sigaction = sig_usr2_handler, 34 .sa_flags = SA_SIGINFO 35 }; 36 struct event event; 37 u64 *intr_regs; 38 39 FAIL_IF(sigaction(SIGUSR2, &sigact, NULL)); 40 FAIL_IF(kill(getpid(), SIGUSR2)); 41 42 /* Check for platform support for the test */ 43 SKIP_IF(check_pvr_for_sampling_tests()); 44 45 /* Init the event for the sampling test */ 46 event_init_sampling(&event, 0x1001e); 47 event.attr.sample_regs_intr = platform_extended_mask; 48 event.attr.exclude_kernel = 1; 49 FAIL_IF(event_open(&event)); 50 event.mmap_buffer = event_sample_buf_mmap(event.fd, 1); 51 52 FAIL_IF(event_enable(&event)); 53 54 /* workload to make the event overflow */ 55 thirty_two_instruction_loop(10000); 56 57 FAIL_IF(event_disable(&event)); 58 59 /* Check for sample count */ 60 FAIL_IF(!collect_samples(event.mmap_buffer)); 61 62 intr_regs = get_intr_regs(&event, event.mmap_buffer); 63 64 /* Check for intr_regs */ 65 FAIL_IF(!intr_regs); 66 67 /* 68 * Verify that fcs and fch field of MMCR2 match 69 * with corresponding modifier fields. 70 */ 71 if (is_hv) 72 FAIL_IF(event.attr.exclude_kernel != 73 get_mmcr2_fch(get_reg_value(intr_regs, "MMCR2"), 1)); 74 else 75 FAIL_IF(event.attr.exclude_kernel != 76 get_mmcr2_fcs(get_reg_value(intr_regs, "MMCR2"), 1)); 77 78 event_close(&event); 79 return 0; 80 } 81 82 int main(void) 83 { 84 return test_harness(mmcr2_fcs_fch, "mmcr2_fcs_fch"); 85 } 86