| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Copyright 2015, Cyril Bur, IBM Corp. |
| * |
| * This test attempts to see if the VMX registers change across preemption. |
| * Two things should be noted here a) The check_vmx function in asm only checks |
| * the non volatile registers as it is reused from the syscall test b) There is |
| * no way to be sure preemption happened so this test just uses many threads |
| * and a long wait. As such, a successful test doesn't mean much but a failure |
| * is bad. |
| */ |
| |
| #include <stdio.h> |
| #include <unistd.h> |
| #include <sys/syscall.h> |
| #include <sys/time.h> |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| #include <stdlib.h> |
| #include <pthread.h> |
| |
| #include "utils.h" |
| |
| /* Time to wait for workers to get preempted (seconds) */ |
| #define PREEMPT_TIME 20 |
| /* |
| * Factor by which to multiply number of online CPUs for total number of |
| * worker threads |
| */ |
| #define THREAD_FACTOR 8 |
| |
| __thread vector int varray[] = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10,11,12}, |
| {13,14,15,16},{17,18,19,20},{21,22,23,24}, |
| {25,26,27,28},{29,30,31,32},{33,34,35,36}, |
| {37,38,39,40},{41,42,43,44},{45,46,47,48}}; |
| |
| int threads_starting; |
| int running; |
| |
| extern void preempt_vmx(vector int *varray, int *threads_starting, int *running); |
| |
| void *preempt_vmx_c(void *p) |
| { |
| int i, j; |
| srand(pthread_self()); |
| for (i = 0; i < 12; i++) |
| for (j = 0; j < 4; j++) |
| varray[i][j] = rand(); |
| |
| /* Test fails if it ever returns */ |
| preempt_vmx(varray, &threads_starting, &running); |
| return p; |
| } |
| |
| int test_preempt_vmx(void) |
| { |
| int i, rc, threads; |
| pthread_t *tids; |
| |
| // vcmpequd used in vmx_asm.S is v2.07 |
| SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_2_07)); |
| |
| threads = sysconf(_SC_NPROCESSORS_ONLN) * THREAD_FACTOR; |
| tids = malloc(threads * sizeof(pthread_t)); |
| FAIL_IF(!tids); |
| |
| running = true; |
| threads_starting = threads; |
| for (i = 0; i < threads; i++) { |
| rc = pthread_create(&tids[i], NULL, preempt_vmx_c, NULL); |
| FAIL_IF(rc); |
| } |
| |
| setbuf(stdout, NULL); |
| /* Not really nessesary but nice to wait for every thread to start */ |
| printf("\tWaiting for all workers to start..."); |
| while(threads_starting) |
| asm volatile("": : :"memory"); |
| printf("done\n"); |
| |
| printf("\tWaiting for %d seconds to let some workers get preempted...", PREEMPT_TIME); |
| sleep(PREEMPT_TIME); |
| printf("done\n"); |
| |
| printf("\tStopping workers..."); |
| /* |
| * Working are checking this value every loop. In preempt_vmx 'cmpwi r5,0; bne 2b'. |
| * r5 will have loaded the value of running. |
| */ |
| running = 0; |
| for (i = 0; i < threads; i++) { |
| void *rc_p; |
| pthread_join(tids[i], &rc_p); |
| |
| /* |
| * Harness will say the fail was here, look at why preempt_vmx |
| * returned |
| */ |
| if ((long) rc_p) |
| printf("oops\n"); |
| FAIL_IF((long) rc_p); |
| } |
| printf("done\n"); |
| |
| return 0; |
| } |
| |
| int main(int argc, char *argv[]) |
| { |
| return test_harness(test_preempt_vmx, "vmx_preempt"); |
| } |