157 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Copyright 2015, Cyril Bur, IBM Corp.4 *5 * This test attempts to see if the VMX registers are correctly reported in a6 * signal context. Each worker just spins checking its VMX registers, at some7 * point a signal will interrupt it and C code will check the signal context8 * ensuring it is also the same.9 */10 11#include <stdio.h>12#include <unistd.h>13#include <sys/syscall.h>14#include <sys/time.h>15#include <sys/types.h>16#include <sys/wait.h>17#include <stdlib.h>18#include <string.h>19#include <pthread.h>20#include <altivec.h>21 22#include "utils.h"23 24/* Number of times each thread should receive the signal */25#define ITERATIONS 1026/*27 * Factor by which to multiply number of online CPUs for total number of28 * worker threads29 */30#define THREAD_FACTOR 831 32__thread vector int varray[] = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10,11,12},33 {13,14,15,16},{17,18,19,20},{21,22,23,24},34 {25,26,27,28},{29,30,31,32},{33,34,35,36},35 {37,38,39,40},{41,42,43,44},{45,46,47,48}};36 37bool bad_context;38int running;39int threads_starting;40 41extern int preempt_vmx(vector int *varray, int *threads_starting, int *sentinal);42 43void signal_vmx_sig(int sig, siginfo_t *info, void *context)44{45 int i;46 ucontext_t *uc = context;47 mcontext_t *mc = &uc->uc_mcontext;48 49 /* Only the non volatiles were loaded up */50 for (i = 20; i < 32; i++) {51 if (memcmp(mc->v_regs->vrregs[i], &varray[i - 20], 16)) {52 int j;53 /*54 * Shouldn't printf() in a signal handler, however, this is a55 * test and we've detected failure. Understanding what failed56 * is paramount. All that happens after this is tests exit with57 * failure.58 */59 printf("VMX mismatch at reg %d!\n", i);60 printf("Reg | Actual | Expected\n");61 for (j = 20; j < 32; j++) {62 printf("%d | 0x%04x%04x%04x%04x | 0x%04x%04x%04x%04x\n", j, mc->v_regs->vrregs[j][0],63 mc->v_regs->vrregs[j][1], mc->v_regs->vrregs[j][2], mc->v_regs->vrregs[j][3],64 varray[j - 20][0], varray[j - 20][1], varray[j - 20][2], varray[j - 20][3]);65 }66 bad_context = true;67 break;68 }69 }70}71 72void *signal_vmx_c(void *p)73{74 int i, j;75 long rc;76 struct sigaction act;77 act.sa_sigaction = signal_vmx_sig;78 act.sa_flags = SA_SIGINFO;79 rc = sigaction(SIGUSR1, &act, NULL);80 if (rc)81 return p;82 83 srand(pthread_self());84 for (i = 0; i < 12; i++)85 for (j = 0; j < 4; j++)86 varray[i][j] = rand();87 88 rc = preempt_vmx(varray, &threads_starting, &running);89 90 return (void *) rc;91}92 93int test_signal_vmx(void)94{95 int i, j, rc, threads;96 void *rc_p;97 pthread_t *tids;98 99 // vcmpequd used in vmx_asm.S is v2.07100 SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_2_07));101 102 threads = sysconf(_SC_NPROCESSORS_ONLN) * THREAD_FACTOR;103 tids = malloc(threads * sizeof(pthread_t));104 FAIL_IF(!tids);105 106 running = true;107 threads_starting = threads;108 for (i = 0; i < threads; i++) {109 rc = pthread_create(&tids[i], NULL, signal_vmx_c, NULL);110 FAIL_IF(rc);111 }112 113 setbuf(stdout, NULL);114 printf("\tWaiting for %d workers to start... %d", threads, threads_starting);115 while (threads_starting) {116 asm volatile("": : :"memory");117 usleep(1000);118 printf(", %d", threads_starting);119 }120 printf(" ...done\n");121 122 printf("\tSending signals to all threads %d times...", ITERATIONS);123 for (i = 0; i < ITERATIONS; i++) {124 for (j = 0; j < threads; j++) {125 pthread_kill(tids[j], SIGUSR1);126 }127 sleep(1);128 }129 printf("done\n");130 131 printf("\tKilling workers...");132 running = 0;133 for (i = 0; i < threads; i++) {134 pthread_join(tids[i], &rc_p);135 136 /*137 * Harness will say the fail was here, look at why signal_vmx138 * returned139 */140 if ((long) rc_p || bad_context)141 printf("oops\n");142 if (bad_context)143 fprintf(stderr, "\t!! bad_context is true\n");144 FAIL_IF((long) rc_p || bad_context);145 }146 printf("done\n");147 148 free(tids);149 return 0;150}151 152int main(int argc, char *argv[])153{154 test_harness_set_timeout(360);155 return test_harness(test_signal_vmx, "vmx_signal");156}157