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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
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
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
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
152 int main(int argc, char *argv[])
153 {
154         test_harness_set_timeout(360);
155         return test_harness(test_signal_vmx, "vmx_signal");
156 }
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