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

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  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 }
157 

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