872d11bca9
Some of our tests use VSX or newer VMX instructions, so need to be skipped on older CPUs to avoid SIGILL'ing. Similarly TAR was added in v2.07, and the PMU event used in the stcx fail test only works on Power8 or later. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200803020719.96114-1-mpe@ellerman.id.au
111 lines
2.7 KiB
C
111 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright 2015, Cyril Bur, IBM Corp.
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*
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* This test attempts to see if the VMX registers change across preemption.
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* Two things should be noted here a) The check_vmx function in asm only checks
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* the non volatile registers as it is reused from the syscall test b) There is
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* no way to be sure preemption happened so this test just uses many threads
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* and a long wait. As such, a successful test doesn't mean much but a failure
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* is bad.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/syscall.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <stdlib.h>
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#include <pthread.h>
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#include "utils.h"
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/* Time to wait for workers to get preempted (seconds) */
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#define PREEMPT_TIME 20
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/*
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* Factor by which to multiply number of online CPUs for total number of
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* worker threads
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*/
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#define THREAD_FACTOR 8
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__thread vector int varray[] = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10,11,12},
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{13,14,15,16},{17,18,19,20},{21,22,23,24},
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{25,26,27,28},{29,30,31,32},{33,34,35,36},
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{37,38,39,40},{41,42,43,44},{45,46,47,48}};
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int threads_starting;
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int running;
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extern void preempt_vmx(vector int *varray, int *threads_starting, int *running);
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void *preempt_vmx_c(void *p)
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{
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int i, j;
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srand(pthread_self());
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for (i = 0; i < 12; i++)
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for (j = 0; j < 4; j++)
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varray[i][j] = rand();
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/* Test fails if it ever returns */
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preempt_vmx(varray, &threads_starting, &running);
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return p;
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}
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int test_preempt_vmx(void)
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{
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int i, rc, threads;
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pthread_t *tids;
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// vcmpequd used in vmx_asm.S is v2.07
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SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_2_07));
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threads = sysconf(_SC_NPROCESSORS_ONLN) * THREAD_FACTOR;
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tids = malloc(threads * sizeof(pthread_t));
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FAIL_IF(!tids);
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running = true;
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threads_starting = threads;
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for (i = 0; i < threads; i++) {
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rc = pthread_create(&tids[i], NULL, preempt_vmx_c, NULL);
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FAIL_IF(rc);
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}
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setbuf(stdout, NULL);
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/* Not really nessesary but nice to wait for every thread to start */
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printf("\tWaiting for all workers to start...");
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while(threads_starting)
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asm volatile("": : :"memory");
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printf("done\n");
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printf("\tWaiting for %d seconds to let some workers get preempted...", PREEMPT_TIME);
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sleep(PREEMPT_TIME);
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printf("done\n");
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printf("\tStopping workers...");
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/*
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* Working are checking this value every loop. In preempt_vmx 'cmpwi r5,0; bne 2b'.
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* r5 will have loaded the value of running.
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*/
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running = 0;
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for (i = 0; i < threads; i++) {
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void *rc_p;
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pthread_join(tids[i], &rc_p);
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/*
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* Harness will say the fail was here, look at why preempt_vmx
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* returned
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*/
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if ((long) rc_p)
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printf("oops\n");
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FAIL_IF((long) rc_p);
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}
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printf("done\n");
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return 0;
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}
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int main(int argc, char *argv[])
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{
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return test_harness(test_preempt_vmx, "vmx_preempt");
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}
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