From 48e8c571a4f86978c72c2aa799dc7436d1c38c77 Mon Sep 17 00:00:00 2001 From: Cyril Bur Date: Mon, 29 Feb 2016 17:53:45 +1100 Subject: selftests/powerpc: Test FPU and VMX regs in signal ucontext Load up the non volatile FPU and VMX regs and ensure that they are the expected value in a signal handler Signed-off-by: Cyril Bur Signed-off-by: Michael Ellerman --- tools/testing/selftests/powerpc/math/vmx_signal.c | 156 ++++++++++++++++++++++ 1 file changed, 156 insertions(+) create mode 100644 tools/testing/selftests/powerpc/math/vmx_signal.c (limited to 'tools/testing/selftests/powerpc/math/vmx_signal.c') diff --git a/tools/testing/selftests/powerpc/math/vmx_signal.c b/tools/testing/selftests/powerpc/math/vmx_signal.c new file mode 100644 index 000000000000..671d7533a557 --- /dev/null +++ b/tools/testing/selftests/powerpc/math/vmx_signal.c @@ -0,0 +1,156 @@ +/* + * Copyright 2015, Cyril Bur, IBM Corp. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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; + + 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[]) +{ + return test_harness(test_signal_vmx, "vmx_signal"); +} -- cgit v1.2.3-59-g8ed1b