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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 change across preemption.6 * Two things should be noted here a) The check_vmx function in asm only checks7 * the non volatile registers as it is reused from the syscall test b) There is8 * no way to be sure preemption happened so this test just uses many threads9 * and a long wait. As such, a successful test doesn't mean much but a failure10 * is bad.11 */12 13#include <stdio.h>14#include <unistd.h>15#include <sys/syscall.h>16#include <sys/time.h>17#include <sys/types.h>18#include <sys/wait.h>19#include <stdlib.h>20#include <pthread.h>21 22#include "utils.h"23 24/* Time to wait for workers to get preempted (seconds) */25#define PREEMPT_TIME 2026/*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 37int threads_starting;38int running;39 40extern int preempt_vmx(vector int *varray, int *threads_starting, int *running);41 42void *preempt_vmx_c(void *p)43{44 int i, j;45 long rc;46 47 srand(pthread_self());48 for (i = 0; i < 12; i++)49 for (j = 0; j < 4; j++)50 varray[i][j] = rand();51 52 rc = preempt_vmx(varray, &threads_starting, &running);53 54 return (void *)rc;55}56 57int test_preempt_vmx(void)58{59 int i, rc, threads;60 pthread_t *tids;61 62 // vcmpequd used in vmx_asm.S is v2.0763 SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_2_07));64 65 threads = sysconf(_SC_NPROCESSORS_ONLN) * THREAD_FACTOR;66 tids = malloc(threads * sizeof(pthread_t));67 FAIL_IF(!tids);68 69 running = true;70 threads_starting = threads;71 for (i = 0; i < threads; i++) {72 rc = pthread_create(&tids[i], NULL, preempt_vmx_c, NULL);73 FAIL_IF(rc);74 }75 76 setbuf(stdout, NULL);77 /* Not really nessesary but nice to wait for every thread to start */78 printf("\tWaiting for all workers to start...");79 while(threads_starting)80 asm volatile("": : :"memory");81 printf("done\n");82 83 printf("\tWaiting for %d seconds to let some workers get preempted...", PREEMPT_TIME);84 sleep(PREEMPT_TIME);85 printf("done\n");86 87 printf("\tStopping workers...");88 /*89 * Working are checking this value every loop. In preempt_vmx 'cmpwi r5,0; bne 2b'.90 * r5 will have loaded the value of running.91 */92 running = 0;93 for (i = 0; i < threads; i++) {94 void *rc_p;95 pthread_join(tids[i], &rc_p);96 97 /*98 * Harness will say the fail was here, look at why preempt_vmx99 * returned100 */101 if ((long) rc_p)102 printf("oops\n");103 FAIL_IF((long) rc_p);104 }105 printf("done\n");106 107 return 0;108}109 110int main(int argc, char *argv[])111{112 return test_harness(test_preempt_vmx, "vmx_preempt");113}114