1/*
2 * Copyright 2015, Cyril Bur, IBM Corp.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * This test attempts to see if the VMX registers are correctly reported in a
10 * signal context. Each worker just spins checking its VMX registers, at some
11 * point a signal will interrupt it and C code will check the signal context
12 * ensuring it is also the same.
13 */
14
15#include <stdio.h>
16#include <unistd.h>
17#include <sys/syscall.h>
18#include <sys/time.h>
19#include <sys/types.h>
20#include <sys/wait.h>
21#include <stdlib.h>
22#include <string.h>
23#include <pthread.h>
24#include <altivec.h>
25
26#include "utils.h"
27
28/* Number of times each thread should receive the signal */
29#define ITERATIONS 10
30/*
31 * Factor by which to multiply number of online CPUs for total number of
32 * worker threads
33 */
34#define THREAD_FACTOR 8
35
36__thread vector int varray[] = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10,11,12},
37	{13,14,15,16},{17,18,19,20},{21,22,23,24},
38	{25,26,27,28},{29,30,31,32},{33,34,35,36},
39	{37,38,39,40},{41,42,43,44},{45,46,47,48}};
40
41bool bad_context;
42int running;
43int threads_starting;
44
45extern int preempt_vmx(vector int *varray, int *threads_starting, int *sentinal);
46
47void signal_vmx_sig(int sig, siginfo_t *info, void *context)
48{
49	int i;
50	ucontext_t *uc = context;
51	mcontext_t *mc = &uc->uc_mcontext;
52
53	/* Only the non volatiles were loaded up */
54	for (i = 20; i < 32; i++) {
55		if (memcmp(mc->v_regs->vrregs[i], &varray[i - 20], 16)) {
56			int j;
57			/*
58			 * Shouldn't printf() in a signal handler, however, this is a
59			 * test and we've detected failure. Understanding what failed
60			 * is paramount. All that happens after this is tests exit with
61			 * failure.
62			 */
63			printf("VMX mismatch at reg %d!\n", i);
64			printf("Reg | Actual                  | Expected\n");
65			for (j = 20; j < 32; j++) {
66				printf("%d  | 0x%04x%04x%04x%04x      | 0x%04x%04x%04x%04x\n", j, mc->v_regs->vrregs[j][0],
67					   mc->v_regs->vrregs[j][1], mc->v_regs->vrregs[j][2], mc->v_regs->vrregs[j][3],
68					   varray[j - 20][0], varray[j - 20][1], varray[j - 20][2], varray[j - 20][3]);
69			}
70			bad_context = true;
71			break;
72		}
73	}
74}
75
76void *signal_vmx_c(void *p)
77{
78	int i, j;
79	long rc;
80	struct sigaction act;
81	act.sa_sigaction = signal_vmx_sig;
82	act.sa_flags = SA_SIGINFO;
83	rc = sigaction(SIGUSR1, &act, NULL);
84	if (rc)
85		return p;
86
87	srand(pthread_self());
88	for (i = 0; i < 12; i++)
89		for (j = 0; j < 4; j++)
90			varray[i][j] = rand();
91
92	rc = preempt_vmx(varray, &threads_starting, &running);
93
94	return (void *) rc;
95}
96
97int test_signal_vmx(void)
98{
99	int i, j, rc, threads;
100	void *rc_p;
101	pthread_t *tids;
102
103	threads = sysconf(_SC_NPROCESSORS_ONLN) * THREAD_FACTOR;
104	tids = malloc(threads * sizeof(pthread_t));
105	FAIL_IF(!tids);
106
107	running = true;
108	threads_starting = threads;
109	for (i = 0; i < threads; i++) {
110		rc = pthread_create(&tids[i], NULL, signal_vmx_c, NULL);
111		FAIL_IF(rc);
112	}
113
114	setbuf(stdout, NULL);
115	printf("\tWaiting for %d workers to start... %d", threads, threads_starting);
116	while (threads_starting) {
117		asm volatile("": : :"memory");
118		usleep(1000);
119		printf(", %d", threads_starting);
120	}
121	printf(" ...done\n");
122
123	printf("\tSending signals to all threads %d times...", ITERATIONS);
124	for (i = 0; i < ITERATIONS; i++) {
125		for (j = 0; j < threads; j++) {
126			pthread_kill(tids[j], SIGUSR1);
127		}
128		sleep(1);
129	}
130	printf("done\n");
131
132	printf("\tKilling workers...");
133	running = 0;
134	for (i = 0; i < threads; i++) {
135		pthread_join(tids[i], &rc_p);
136
137		/*
138		 * Harness will say the fail was here, look at why signal_vmx
139		 * returned
140		 */
141		if ((long) rc_p || bad_context)
142			printf("oops\n");
143		if (bad_context)
144			fprintf(stderr, "\t!! bad_context is true\n");
145		FAIL_IF((long) rc_p || bad_context);
146	}
147	printf("done\n");
148
149	free(tids);
150	return 0;
151}
152
153int main(int argc, char *argv[])
154{
155	return test_harness(test_signal_vmx, "vmx_signal");
156}
157