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Linux/tools/testing/selftests/powerpc/math/vsx_preempt.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 VSX registers change across preemption.
 10  * There is no way to be sure preemption happened so this test just
 11  * uses many threads and a long wait. As such, a successful test
 12  * doesn't mean much but a failure is bad.
 13  */
 14 
 15 #include <stdio.h>
 16 #include <string.h>
 17 #include <unistd.h>
 18 #include <sys/syscall.h>
 19 #include <sys/time.h>
 20 #include <sys/types.h>
 21 #include <sys/wait.h>
 22 #include <stdlib.h>
 23 #include <pthread.h>
 24 
 25 #include "utils.h"
 26 
 27 /* Time to wait for workers to get preempted (seconds) */
 28 #define PREEMPT_TIME 20
 29 /*
 30  * Factor by which to multiply number of online CPUs for total number of
 31  * worker threads
 32  */
 33 #define THREAD_FACTOR 8
 34 
 35 /*
 36  * Ensure there is twice the number of non-volatile VMX regs!
 37  * check_vmx() is going to use the other half as space to put the live
 38  * registers before calling vsx_memcmp()
 39  */
 40 __thread vector int varray[24] = {
 41         {1, 2, 3, 4 }, {5, 6, 7, 8 }, {9, 10,11,12},
 42         {13,14,15,16}, {17,18,19,20}, {21,22,23,24},
 43         {25,26,27,28}, {29,30,31,32}, {33,34,35,36},
 44         {37,38,39,40}, {41,42,43,44}, {45,46,47,48}
 45 };
 46 
 47 int threads_starting;
 48 int running;
 49 
 50 extern long preempt_vsx(vector int *varray, int *threads_starting, int *running);
 51 
 52 long vsx_memcmp(vector int *a) {
 53         vector int zero = {0, 0, 0, 0};
 54         int i;
 55 
 56         FAIL_IF(a != varray);
 57 
 58         for(i = 0; i < 12; i++) {
 59                 if (memcmp(&a[i + 12], &zero, sizeof(vector int)) == 0) {
 60                         fprintf(stderr, "Detected zero from the VSX reg %d\n", i + 12);
 61                         return 2;
 62                 }
 63         }
 64 
 65         if (memcmp(a, &a[12], 12 * sizeof(vector int))) {
 66                 long *p = (long *)a;
 67                 fprintf(stderr, "VSX mismatch\n");
 68                 for (i = 0; i < 24; i=i+2)
 69                         fprintf(stderr, "%d: 0x%08lx%08lx | 0x%08lx%08lx\n",
 70                                         i/2 + i%2 + 20, p[i], p[i + 1], p[i + 24], p[i + 25]);
 71                 return 1;
 72         }
 73         return 0;
 74 }
 75 
 76 void *preempt_vsx_c(void *p)
 77 {
 78         int i, j;
 79         long rc;
 80         srand(pthread_self());
 81         for (i = 0; i < 12; i++)
 82                 for (j = 0; j < 4; j++) {
 83                         varray[i][j] = rand();
 84                         /* Don't want zero because it hides kernel problems */
 85                         if (varray[i][j] == 0)
 86                                 j--;
 87                 }
 88         rc = preempt_vsx(varray, &threads_starting, &running);
 89         if (rc == 2)
 90                 fprintf(stderr, "Caught zeros in VSX compares\n");
 91         return (void *)rc;
 92 }
 93 
 94 int test_preempt_vsx(void)
 95 {
 96         int i, rc, threads;
 97         pthread_t *tids;
 98 
 99         threads = sysconf(_SC_NPROCESSORS_ONLN) * THREAD_FACTOR;
100         tids = malloc(threads * sizeof(pthread_t));
101         FAIL_IF(!tids);
102 
103         running = true;
104         threads_starting = threads;
105         for (i = 0; i < threads; i++) {
106                 rc = pthread_create(&tids[i], NULL, preempt_vsx_c, NULL);
107                 FAIL_IF(rc);
108         }
109 
110         setbuf(stdout, NULL);
111         /* Not really nessesary but nice to wait for every thread to start */
112         printf("\tWaiting for %d workers to start...", threads_starting);
113         while(threads_starting)
114                 asm volatile("": : :"memory");
115         printf("done\n");
116 
117         printf("\tWaiting for %d seconds to let some workers get preempted...", PREEMPT_TIME);
118         sleep(PREEMPT_TIME);
119         printf("done\n");
120 
121         printf("\tStopping workers...");
122         /*
123          * Working are checking this value every loop. In preempt_vsx 'cmpwi r5,0; bne 2b'.
124          * r5 will have loaded the value of running.
125          */
126         running = 0;
127         for (i = 0; i < threads; i++) {
128                 void *rc_p;
129                 pthread_join(tids[i], &rc_p);
130 
131                 /*
132                  * Harness will say the fail was here, look at why preempt_vsx
133                  * returned
134                  */
135                 if ((long) rc_p)
136                         printf("oops\n");
137                 FAIL_IF((long) rc_p);
138         }
139         printf("done\n");
140 
141         return 0;
142 }
143 
144 int main(int argc, char *argv[])
145 {
146         return test_harness(test_preempt_vsx, "vsx_preempt");
147 }
148 

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