// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright 2015, Cyril Bur, IBM Corp.
 *
 * This test attempts to see if the VMX registers are correctly reported in a
 * signal context. Each worker just spins checking its VMX registers, at some
 * point a signal will interrupt it and C code will check the signal context
 * ensuring it is also the same.
 */

#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 <string.h>
#include <pthread.h>
#include <altivec.h>

#include "utils.h"

/* Number of times each thread should receive the signal */
#define ITERATIONS 10
/*
 * 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}};

bool bad_context;
int running;
int threads_starting;

extern int preempt_vmx(vector int *varray, int *threads_starting, int *sentinal);

void signal_vmx_sig(int sig, siginfo_t *info, void *context)
{
        int i;
        ucontext_t *uc = context;
        mcontext_t *mc = &uc->uc_mcontext;

        /* Only the non volatiles were loaded up */
        for (i = 20; i < 32; i++) {
                if (memcmp(mc->v_regs->vrregs[i], &varray[i - 20], 16)) {
                        int j;
                        /*
                         * Shouldn't printf() in a signal handler, however, this is a
                         * test and we've detected failure. Understanding what failed
                         * is paramount. All that happens after this is tests exit with
                         * failure.
                         */
                        printf("VMX mismatch at reg %d!\n", i);
                        printf("Reg | Actual                  | Expected\n");
                        for (j = 20; j < 32; j++) {
                                printf("%d  | 0x%04x%04x%04x%04x      | 0x%04x%04x%04x%04x\n", j, mc->v_regs->vrregs[j][0],
                                           mc->v_regs->vrregs[j][1], mc->v_regs->vrregs[j][2], mc->v_regs->vrregs[j][3],
                                           varray[j - 20][0], varray[j - 20][1], varray[j - 20][2], varray[j - 20][3]);
                        }
                        bad_context = true;
                        break;
                }
        }
}

void *signal_vmx_c(void *p)
{
        int i, j;
        long rc;
        struct sigaction act;
        act.sa_sigaction = signal_vmx_sig;
        act.sa_flags = SA_SIGINFO;
        rc = sigaction(SIGUSR1, &act, NULL);
        if (rc)
                return p;

        srand(pthread_self());
        for (i = 0; i < 12; i++)
                for (j = 0; j < 4; j++)
                        varray[i][j] = rand();

        rc = preempt_vmx(varray, &threads_starting, &running);

        return (void *) rc;
}

int test_signal_vmx(void)
{
        int i, j, rc, threads;
        void *rc_p;
        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, signal_vmx_c, NULL);
                FAIL_IF(rc);
        }

        setbuf(stdout, NULL);
        printf("\tWaiting for %d workers to start... %d", threads, threads_starting);
        while (threads_starting) {
                asm volatile("": : :"memory");
                usleep(1000);
                printf(", %d", threads_starting);
        }
        printf(" ...done\n");

        printf("\tSending signals to all threads %d times...", ITERATIONS);
        for (i = 0; i < ITERATIONS; i++) {
                for (j = 0; j < threads; j++) {
                        pthread_kill(tids[j], SIGUSR1);
                }
                sleep(1);
        }
        printf("done\n");

        printf("\tKilling workers...");
        running = 0;
        for (i = 0; i < threads; i++) {
                pthread_join(tids[i], &rc_p);

                /*
                 * Harness will say the fail was here, look at why signal_vmx
                 * returned
                 */
                if ((long) rc_p || bad_context)
                        printf("oops\n");
                if (bad_context)
                        fprintf(stderr, "\t!! bad_context is true\n");
                FAIL_IF((long) rc_p || bad_context);
        }
        printf("done\n");

        free(tids);
        return 0;
}

int main(int argc, char *argv[])
{
        test_harness_set_timeout(360);
        return test_harness(test_signal_vmx, "vmx_signal");
}