powerpc/math/vmx_signal.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * Copyright 2015, Cyril Bur, IBM Corp.
0004  *
0005  * This test attempts to see if the VMX registers are correctly reported in a
0006  * signal context. Each worker just spins checking its VMX registers, at some
0007  * point a signal will interrupt it and C code will check the signal context
0008  * ensuring it is also the same.
0009  */
0010
0011 #include <stdio.h>
0012 #include <unistd.h>
0013 #include <sys/syscall.h>
0014 #include <sys/time.h>
0015 #include <sys/types.h>
0016 #include <sys/wait.h>
0017 #include <stdlib.h>
0018 #include <string.h>
0019 #include <pthread.h>
0020 #include <altivec.h>
0021
0022 #include "utils.h"
0023
0024 /* Number of times each thread should receive the signal */
0025 #define ITERATIONS 10
0026 /*
0027  * Factor by which to multiply number of online CPUs for total number of
0028  * worker threads
0029  */
0030 #define THREAD_FACTOR 8
0031
0032 __thread vector int varray[] = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10,11,12},
0033     {13,14,15,16},{17,18,19,20},{21,22,23,24},
0034     {25,26,27,28},{29,30,31,32},{33,34,35,36},
0035     {37,38,39,40},{41,42,43,44},{45,46,47,48}};
0036
0037 bool bad_context;
0038 int running;
0039 int threads_starting;
0040
0041 extern int preempt_vmx(vector int *varray, int *threads_starting, int *sentinal);
0042
0043 void signal_vmx_sig(int sig, siginfo_t *info, void *context)
0044 {
0045     int i;
0046     ucontext_t *uc = context;
0047     mcontext_t *mc = &uc->uc_mcontext;
0048
0049     /* Only the non volatiles were loaded up */
0050     for (i = 20; i < 32; i++) {
0051         if (memcmp(mc->v_regs->vrregs[i], &varray[i - 20], 16)) {
0052             int j;
0053             /*
0054              * Shouldn't printf() in a signal handler, however, this is a
0055              * test and we've detected failure. Understanding what failed
0056              * is paramount. All that happens after this is tests exit with
0057              * failure.
0058              */
0059             printf("VMX mismatch at reg %d!\n", i);
0060             printf("Reg | Actual                  | Expected\n");
0061             for (j = 20; j < 32; j++) {
0062                 printf("%d  | 0x%04x%04x%04x%04x      | 0x%04x%04x%04x%04x\n", j, mc->v_regs->vrregs[j][0],
0063                        mc->v_regs->vrregs[j][1], mc->v_regs->vrregs[j][2], mc->v_regs->vrregs[j][3],
0064                        varray[j - 20][0], varray[j - 20][1], varray[j - 20][2], varray[j - 20][3]);
0065             }
0066             bad_context = true;
0067             break;
0068         }
0069     }
0070 }
0071
0072 void *signal_vmx_c(void *p)
0073 {
0074     int i, j;
0075     long rc;
0076     struct sigaction act;
0077     act.sa_sigaction = signal_vmx_sig;
0078     act.sa_flags = SA_SIGINFO;
0079     rc = sigaction(SIGUSR1, &act, NULL);
0080     if (rc)
0081         return p;
0082
0083     srand(pthread_self());
0084     for (i = 0; i < 12; i++)
0085         for (j = 0; j < 4; j++)
0086             varray[i][j] = rand();
0087
0088     rc = preempt_vmx(varray, &threads_starting, &running);
0089
0090     return (void *) rc;
0091 }
0092
0093 int test_signal_vmx(void)
0094 {
0095     int i, j, rc, threads;
0096     void *rc_p;
0097     pthread_t *tids;
0098
0099     // vcmpequd used in vmx_asm.S is v2.07
0100     SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_2_07));
0101
0102     threads = sysconf(_SC_NPROCESSORS_ONLN) * THREAD_FACTOR;
0103     tids = malloc(threads * sizeof(pthread_t));
0104     FAIL_IF(!tids);
0105
0106     running = true;
0107     threads_starting = threads;
0108     for (i = 0; i < threads; i++) {
0109         rc = pthread_create(&tids[i], NULL, signal_vmx_c, NULL);
0110         FAIL_IF(rc);
0111     }
0112
0113     setbuf(stdout, NULL);
0114     printf("\tWaiting for %d workers to start... %d", threads, threads_starting);
0115     while (threads_starting) {
0116         asm volatile("": : :"memory");
0117         usleep(1000);
0118         printf(", %d", threads_starting);
0119     }
0120     printf(" ...done\n");
0121
0122     printf("\tSending signals to all threads %d times...", ITERATIONS);
0123     for (i = 0; i < ITERATIONS; i++) {
0124         for (j = 0; j < threads; j++) {
0125             pthread_kill(tids[j], SIGUSR1);
0126         }
0127         sleep(1);
0128     }
0129     printf("done\n");
0130
0131     printf("\tKilling workers...");
0132     running = 0;
0133     for (i = 0; i < threads; i++) {
0134         pthread_join(tids[i], &rc_p);
0135
0136         /*
0137          * Harness will say the fail was here, look at why signal_vmx
0138          * returned
0139          */
0140         if ((long) rc_p || bad_context)
0141             printf("oops\n");
0142         if (bad_context)
0143             fprintf(stderr, "\t!! bad_context is true\n");
0144         FAIL_IF((long) rc_p || bad_context);
0145     }
0146     printf("done\n");
0147
0148     free(tids);
0149     return 0;
0150 }
0151
0152 int main(int argc, char *argv[])
0153 {
0154     return test_harness(test_signal_vmx, "vmx_signal");
0155 }