tools/testing/selftests/powerpc/math/vmx_signal.c

   1 /*
   2  * Copyright 2015, Cyril Bur, IBM Corp.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version
   7  * 2 of the License, or (at your option) any later version.
   8  *
   9  * This test attempts to see if the VMX registers are correctly reported in a
  10  * signal context. Each worker just spins checking its VMX registers, at some
  11  * point a signal will interrupt it and C code will check the signal context
  12  * ensuring it is also the same.
  13  */
  14
  15 #include <stdio.h>
  16 #include <unistd.h>
  17 #include <sys/syscall.h>
  18 #include <sys/time.h>
  19 #include <sys/types.h>
  20 #include <sys/wait.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <pthread.h>
  24 #include <altivec.h>
  25
  26 #include "utils.h"
  27
  28 /* Number of times each thread should receive the signal */
  29 #define ITERATIONS 10
  30 /*
  31  * Factor by which to multiply number of online CPUs for total number of
  32  * worker threads
  33  */
  34 #define THREAD_FACTOR 8
  35
  36 __thread vector int varray[] = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10,11,12},
  37         {13,14,15,16},{17,18,19,20},{21,22,23,24},
  38         {25,26,27,28},{29,30,31,32},{33,34,35,36},
  39         {37,38,39,40},{41,42,43,44},{45,46,47,48}};
  40
  41 bool bad_context;
  42 int running;
  43 int threads_starting;
  44
  45 extern int preempt_vmx(vector int *varray, int *threads_starting, int *sentinal);
  46
  47 void signal_vmx_sig(int sig, siginfo_t *info, void *context)
  48 {
  49         int i;
  50         ucontext_t *uc = context;
  51         mcontext_t *mc = &uc->uc_mcontext;
  52
  53         /* Only the non volatiles were loaded up */
  54         for (i = 20; i < 32; i++) {
  55                 if (memcmp(mc->v_regs->vrregs[i], &varray[i - 20], 16)) {
  56                         int j;
  57                         /*
  58                          * Shouldn't printf() in a signal handler, however, this is a
  59                          * test and we've detected failure. Understanding what failed
  60                          * is paramount. All that happens after this is tests exit with
  61                          * failure.
  62                          */
  63                         printf("VMX mismatch at reg %d!\n", i);
  64                         printf("Reg | Actual                  | Expected\n");
  65                         for (j = 20; j < 32; j++) {
  66                                 printf("%d  | 0x%04x%04x%04x%04x      | 0x%04x%04x%04x%04x\n", j, mc->v_regs->vrregs[j][0],
  67                                            mc->v_regs->vrregs[j][1], mc->v_regs->vrregs[j][2], mc->v_regs->vrregs[j][3],
  68                                            varray[j - 20][0], varray[j - 20][1], varray[j - 20][2], varray[j - 20][3]);
  69                         }
  70                         bad_context = true;
  71                         break;
  72                 }
  73         }
  74 }
  75
  76 void *signal_vmx_c(void *p)
  77 {
  78         int i, j;
  79         long rc;
  80         struct sigaction act;
  81         act.sa_sigaction = signal_vmx_sig;
  82         act.sa_flags = SA_SIGINFO;
  83         rc = sigaction(SIGUSR1, &act, NULL);
  84         if (rc)
  85                 return p;
  86
  87         srand(pthread_self());
  88         for (i = 0; i < 12; i++)
  89                 for (j = 0; j < 4; j++)
  90                         varray[i][j] = rand();
  91
  92         rc = preempt_vmx(varray, &threads_starting, &running);
  93
  94         return (void *) rc;
  95 }
  96
  97 int test_signal_vmx(void)
  98 {
  99         int i, j, rc, threads;
 100         void *rc_p;
 101         pthread_t *tids;
 102
 103         threads = sysconf(_SC_NPROCESSORS_ONLN) * THREAD_FACTOR;
 104         tids = malloc(threads * sizeof(pthread_t));
 105         FAIL_IF(!tids);
 106
 107         running = true;
 108         threads_starting = threads;
 109         for (i = 0; i < threads; i++) {
 110                 rc = pthread_create(&tids[i], NULL, signal_vmx_c, NULL);
 111                 FAIL_IF(rc);
 112         }
 113
 114         setbuf(stdout, NULL);
 115         printf("\tWaiting for %d workers to start... %d", threads, threads_starting);
 116         while (threads_starting) {
 117                 asm volatile("": : :"memory");
 118                 usleep(1000);
 119                 printf(", %d", threads_starting);
 120         }
 121         printf(" ...done\n");
 122
 123         printf("\tSending signals to all threads %d times...", ITERATIONS);
 124         for (i = 0; i < ITERATIONS; i++) {
 125                 for (j = 0; j < threads; j++) {
 126                         pthread_kill(tids[j], SIGUSR1);
 127                 }
 128                 sleep(1);
 129         }
 130         printf("done\n");
 131
 132         printf("\tKilling workers...");
 133         running = 0;
 134         for (i = 0; i < threads; i++) {
 135                 pthread_join(tids[i], &rc_p);
 136
 137                 /*
 138                  * Harness will say the fail was here, look at why signal_vmx
 139                  * returned
 140                  */
 141                 if ((long) rc_p || bad_context)
 142                         printf("oops\n");
 143                 if (bad_context)
 144                         fprintf(stderr, "\t!! bad_context is true\n");
 145                 FAIL_IF((long) rc_p || bad_context);
 146         }
 147         printf("done\n");
 148
 149         free(tids);
 150         return 0;
 151 }
 152
 153 int main(int argc, char *argv[])
 154 {
 155         return test_harness(test_signal_vmx, "vmx_signal");
 156 }