1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Originally done by Vince Weaver <vincent.weaver@maine.edu> for
4*4882a593Smuzhiyun * perf_event_tests (git://github.com/deater/perf_event_tests)
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun /*
8*4882a593Smuzhiyun * Powerpc needs __SANE_USERSPACE_TYPES__ before <linux/types.h> to select
9*4882a593Smuzhiyun * 'int-ll64.h' and avoid compile warnings when printing __u64 with %llu.
10*4882a593Smuzhiyun */
11*4882a593Smuzhiyun #define __SANE_USERSPACE_TYPES__
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun #include <stdlib.h>
14*4882a593Smuzhiyun #include <stdio.h>
15*4882a593Smuzhiyun #include <unistd.h>
16*4882a593Smuzhiyun #include <string.h>
17*4882a593Smuzhiyun #include <sys/ioctl.h>
18*4882a593Smuzhiyun #include <time.h>
19*4882a593Smuzhiyun #include <fcntl.h>
20*4882a593Smuzhiyun #include <signal.h>
21*4882a593Smuzhiyun #include <sys/mman.h>
22*4882a593Smuzhiyun #include <linux/compiler.h>
23*4882a593Smuzhiyun #include <linux/hw_breakpoint.h>
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun #include "tests.h"
26*4882a593Smuzhiyun #include "debug.h"
27*4882a593Smuzhiyun #include "event.h"
28*4882a593Smuzhiyun #include "../perf-sys.h"
29*4882a593Smuzhiyun #include "cloexec.h"
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun static int overflows;
32*4882a593Smuzhiyun
test_function(void)33*4882a593Smuzhiyun static noinline int test_function(void)
34*4882a593Smuzhiyun {
35*4882a593Smuzhiyun return time(NULL);
36*4882a593Smuzhiyun }
37*4882a593Smuzhiyun
sig_handler(int signum __maybe_unused,siginfo_t * oh __maybe_unused,void * uc __maybe_unused)38*4882a593Smuzhiyun static void sig_handler(int signum __maybe_unused,
39*4882a593Smuzhiyun siginfo_t *oh __maybe_unused,
40*4882a593Smuzhiyun void *uc __maybe_unused)
41*4882a593Smuzhiyun {
42*4882a593Smuzhiyun overflows++;
43*4882a593Smuzhiyun }
44*4882a593Smuzhiyun
bp_count(int fd)45*4882a593Smuzhiyun static long long bp_count(int fd)
46*4882a593Smuzhiyun {
47*4882a593Smuzhiyun long long count;
48*4882a593Smuzhiyun int ret;
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun ret = read(fd, &count, sizeof(long long));
51*4882a593Smuzhiyun if (ret != sizeof(long long)) {
52*4882a593Smuzhiyun pr_debug("failed to read: %d\n", ret);
53*4882a593Smuzhiyun return TEST_FAIL;
54*4882a593Smuzhiyun }
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun return count;
57*4882a593Smuzhiyun }
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun #define EXECUTIONS 10000
60*4882a593Smuzhiyun #define THRESHOLD 100
61*4882a593Smuzhiyun
test__bp_signal_overflow(struct test * test __maybe_unused,int subtest __maybe_unused)62*4882a593Smuzhiyun int test__bp_signal_overflow(struct test *test __maybe_unused, int subtest __maybe_unused)
63*4882a593Smuzhiyun {
64*4882a593Smuzhiyun struct perf_event_attr pe;
65*4882a593Smuzhiyun struct sigaction sa;
66*4882a593Smuzhiyun long long count;
67*4882a593Smuzhiyun int fd, i, fails = 0;
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun /* setup SIGIO signal handler */
70*4882a593Smuzhiyun memset(&sa, 0, sizeof(struct sigaction));
71*4882a593Smuzhiyun sa.sa_sigaction = (void *) sig_handler;
72*4882a593Smuzhiyun sa.sa_flags = SA_SIGINFO;
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun if (sigaction(SIGIO, &sa, NULL) < 0) {
75*4882a593Smuzhiyun pr_debug("failed setting up signal handler\n");
76*4882a593Smuzhiyun return TEST_FAIL;
77*4882a593Smuzhiyun }
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun memset(&pe, 0, sizeof(struct perf_event_attr));
80*4882a593Smuzhiyun pe.type = PERF_TYPE_BREAKPOINT;
81*4882a593Smuzhiyun pe.size = sizeof(struct perf_event_attr);
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun pe.config = 0;
84*4882a593Smuzhiyun pe.bp_type = HW_BREAKPOINT_X;
85*4882a593Smuzhiyun pe.bp_addr = (unsigned long) test_function;
86*4882a593Smuzhiyun pe.bp_len = sizeof(long);
87*4882a593Smuzhiyun
88*4882a593Smuzhiyun pe.sample_period = THRESHOLD;
89*4882a593Smuzhiyun pe.sample_type = PERF_SAMPLE_IP;
90*4882a593Smuzhiyun pe.wakeup_events = 1;
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun pe.disabled = 1;
93*4882a593Smuzhiyun pe.exclude_kernel = 1;
94*4882a593Smuzhiyun pe.exclude_hv = 1;
95*4882a593Smuzhiyun
96*4882a593Smuzhiyun fd = sys_perf_event_open(&pe, 0, -1, -1,
97*4882a593Smuzhiyun perf_event_open_cloexec_flag());
98*4882a593Smuzhiyun if (fd < 0) {
99*4882a593Smuzhiyun pr_debug("failed opening event %llx\n", pe.config);
100*4882a593Smuzhiyun return TEST_FAIL;
101*4882a593Smuzhiyun }
102*4882a593Smuzhiyun
103*4882a593Smuzhiyun fcntl(fd, F_SETFL, O_RDWR|O_NONBLOCK|O_ASYNC);
104*4882a593Smuzhiyun fcntl(fd, F_SETSIG, SIGIO);
105*4882a593Smuzhiyun fcntl(fd, F_SETOWN, getpid());
106*4882a593Smuzhiyun
107*4882a593Smuzhiyun ioctl(fd, PERF_EVENT_IOC_RESET, 0);
108*4882a593Smuzhiyun ioctl(fd, PERF_EVENT_IOC_ENABLE, 0);
109*4882a593Smuzhiyun
110*4882a593Smuzhiyun for (i = 0; i < EXECUTIONS; i++)
111*4882a593Smuzhiyun test_function();
112*4882a593Smuzhiyun
113*4882a593Smuzhiyun ioctl(fd, PERF_EVENT_IOC_DISABLE, 0);
114*4882a593Smuzhiyun
115*4882a593Smuzhiyun count = bp_count(fd);
116*4882a593Smuzhiyun
117*4882a593Smuzhiyun close(fd);
118*4882a593Smuzhiyun
119*4882a593Smuzhiyun pr_debug("count %lld, overflow %d\n",
120*4882a593Smuzhiyun count, overflows);
121*4882a593Smuzhiyun
122*4882a593Smuzhiyun if (count != EXECUTIONS) {
123*4882a593Smuzhiyun pr_debug("\tWrong number of executions %lld != %d\n",
124*4882a593Smuzhiyun count, EXECUTIONS);
125*4882a593Smuzhiyun fails++;
126*4882a593Smuzhiyun }
127*4882a593Smuzhiyun
128*4882a593Smuzhiyun if (overflows != EXECUTIONS / THRESHOLD) {
129*4882a593Smuzhiyun pr_debug("\tWrong number of overflows %d != %d\n",
130*4882a593Smuzhiyun overflows, EXECUTIONS / THRESHOLD);
131*4882a593Smuzhiyun fails++;
132*4882a593Smuzhiyun }
133*4882a593Smuzhiyun
134*4882a593Smuzhiyun return fails ? TEST_FAIL : TEST_OK;
135*4882a593Smuzhiyun }
136