1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright 2015, Cyril Bur, IBM Corp.
4 *
5 * This test attempts to see if the VMX registers are correctly reported in a
6 * signal context. Each worker just spins checking its VMX registers, at some
7 * point a signal will interrupt it and C code will check the signal context
8 * ensuring it is also the same.
9 */
10
11 #include <stdio.h>
12 #include <unistd.h>
13 #include <sys/syscall.h>
14 #include <sys/time.h>
15 #include <sys/types.h>
16 #include <sys/wait.h>
17 #include <stdlib.h>
18 #include <string.h>
19 #include <pthread.h>
20 #include <altivec.h>
21
22 #include "utils.h"
23
24 /* Number of times each thread should receive the signal */
25 #define ITERATIONS 10
26 /*
27 * Factor by which to multiply number of online CPUs for total number of
28 * worker threads
29 */
30 #define THREAD_FACTOR 8
31
32 __thread vector int varray[] = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10,11,12},
33 {13,14,15,16},{17,18,19,20},{21,22,23,24},
34 {25,26,27,28},{29,30,31,32},{33,34,35,36},
35 {37,38,39,40},{41,42,43,44},{45,46,47,48}};
36
37 bool bad_context;
38 int running;
39 int threads_starting;
40
41 extern int preempt_vmx(vector int *varray, int *threads_starting, int *sentinal);
42
signal_vmx_sig(int sig,siginfo_t * info,void * context)43 void signal_vmx_sig(int sig, siginfo_t *info, void *context)
44 {
45 int i;
46 ucontext_t *uc = context;
47 mcontext_t *mc = &uc->uc_mcontext;
48
49 /* Only the non volatiles were loaded up */
50 for (i = 20; i < 32; i++) {
51 if (memcmp(mc->v_regs->vrregs[i], &varray[i - 20], 16)) {
52 int j;
53 /*
54 * Shouldn't printf() in a signal handler, however, this is a
55 * test and we've detected failure. Understanding what failed
56 * is paramount. All that happens after this is tests exit with
57 * failure.
58 */
59 printf("VMX mismatch at reg %d!\n", i);
60 printf("Reg | Actual | Expected\n");
61 for (j = 20; j < 32; j++) {
62 printf("%d | 0x%04x%04x%04x%04x | 0x%04x%04x%04x%04x\n", j, mc->v_regs->vrregs[j][0],
63 mc->v_regs->vrregs[j][1], mc->v_regs->vrregs[j][2], mc->v_regs->vrregs[j][3],
64 varray[j - 20][0], varray[j - 20][1], varray[j - 20][2], varray[j - 20][3]);
65 }
66 bad_context = true;
67 break;
68 }
69 }
70 }
71
signal_vmx_c(void * p)72 void *signal_vmx_c(void *p)
73 {
74 int i, j;
75 long rc;
76 struct sigaction act;
77 act.sa_sigaction = signal_vmx_sig;
78 act.sa_flags = SA_SIGINFO;
79 rc = sigaction(SIGUSR1, &act, NULL);
80 if (rc)
81 return p;
82
83 srand(pthread_self());
84 for (i = 0; i < 12; i++)
85 for (j = 0; j < 4; j++)
86 varray[i][j] = rand();
87
88 rc = preempt_vmx(varray, &threads_starting, &running);
89
90 return (void *) rc;
91 }
92
test_signal_vmx(void)93 int test_signal_vmx(void)
94 {
95 int i, j, rc, threads;
96 void *rc_p;
97 pthread_t *tids;
98
99 // vcmpequd used in vmx_asm.S is v2.07
100 SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_2_07));
101
102 threads = sysconf(_SC_NPROCESSORS_ONLN) * THREAD_FACTOR;
103 tids = malloc(threads * sizeof(pthread_t));
104 FAIL_IF(!tids);
105
106 running = true;
107 threads_starting = threads;
108 for (i = 0; i < threads; i++) {
109 rc = pthread_create(&tids[i], NULL, signal_vmx_c, NULL);
110 FAIL_IF(rc);
111 }
112
113 setbuf(stdout, NULL);
114 printf("\tWaiting for %d workers to start... %d", threads, threads_starting);
115 while (threads_starting) {
116 asm volatile("": : :"memory");
117 usleep(1000);
118 printf(", %d", threads_starting);
119 }
120 printf(" ...done\n");
121
122 printf("\tSending signals to all threads %d times...", ITERATIONS);
123 for (i = 0; i < ITERATIONS; i++) {
124 for (j = 0; j < threads; j++) {
125 pthread_kill(tids[j], SIGUSR1);
126 }
127 sleep(1);
128 }
129 printf("done\n");
130
131 printf("\tKilling workers...");
132 running = 0;
133 for (i = 0; i < threads; i++) {
134 pthread_join(tids[i], &rc_p);
135
136 /*
137 * Harness will say the fail was here, look at why signal_vmx
138 * returned
139 */
140 if ((long) rc_p || bad_context)
141 printf("oops\n");
142 if (bad_context)
143 fprintf(stderr, "\t!! bad_context is true\n");
144 FAIL_IF((long) rc_p || bad_context);
145 }
146 printf("done\n");
147
148 free(tids);
149 return 0;
150 }
151
main(int argc,char * argv[])152 int main(int argc, char *argv[])
153 {
154 return test_harness(test_signal_vmx, "vmx_signal");
155 }
156