1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright 2015, Cyril Bur, IBM Corp. 4 * 5 * This test attempts to see if the VMX registers are correctly reported in a 6 * signal context. Each worker just spins checking its VMX registers, at some 7 * point a signal will interrupt it and C code will check the signal context 8 * 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 10 26 /* 27 * Factor by which to multiply number of online CPUs for total number of 28 * worker threads 29 */ 30 #define THREAD_FACTOR 8 31 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 37 bool bad_context; 38 int running; 39 int threads_starting; 40 41 extern int preempt_vmx(vector int *varray, int *threads_starting, int *sentinal); 42 43 void 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 a 55 * test and we've detected failure. Understanding what failed 56 * is paramount. All that happens after this is tests exit with 57 * 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 72 void *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 93 int 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 v2.07 100 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_vmx 138 * returned 139 */ 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 } 151 152 int main(int argc, char *argv[]) 153 { 154 test_harness_set_timeout(360); 155 return test_harness(test_signal_vmx, "vmx_signal"); 156 } 157