1// SPDX-License-Identifier: GPL-2.0
2#include <errno.h>
3#include <inttypes.h>
4/* For the CPU_* macros */
5#include <sched.h>
6
7#include <sys/types.h>
8#include <sys/stat.h>
9#include <fcntl.h>
10#include <api/fs/fs.h>
11#include <linux/err.h>
12#include <linux/string.h>
13#include <api/fs/tracing_path.h>
14#include "evsel.h"
15#include "tests.h"
16#include "thread_map.h"
17#include <perf/cpumap.h>
18#include "debug.h"
19#include "stat.h"
20#include "util/counts.h"
21
22static int test__openat_syscall_event_on_all_cpus(struct test_suite *test __maybe_unused,
23						  int subtest __maybe_unused)
24{
25	int err = TEST_FAIL, fd, idx;
26	struct perf_cpu cpu;
27	struct perf_cpu_map *cpus;
28	struct evsel *evsel;
29	unsigned int nr_openat_calls = 111, i;
30	cpu_set_t cpu_set;
31	struct perf_thread_map *threads = thread_map__new(-1, getpid(), UINT_MAX);
32	char sbuf[STRERR_BUFSIZE];
33	char errbuf[BUFSIZ];
34
35	if (threads == NULL) {
36		pr_debug("thread_map__new\n");
37		return -1;
38	}
39
40	cpus = perf_cpu_map__new_online_cpus();
41	if (cpus == NULL) {
42		pr_debug("perf_cpu_map__new\n");
43		goto out_thread_map_delete;
44	}
45
46	CPU_ZERO(&cpu_set);
47
48	evsel = evsel__newtp("syscalls", "sys_enter_openat");
49	if (IS_ERR(evsel)) {
50		tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "syscalls", "sys_enter_openat");
51		pr_debug("%s\n", errbuf);
52		err = TEST_SKIP;
53		goto out_cpu_map_delete;
54	}
55
56	if (evsel__open(evsel, cpus, threads) < 0) {
57		pr_debug("failed to open counter: %s, "
58			 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
59			 str_error_r(errno, sbuf, sizeof(sbuf)));
60		err = TEST_SKIP;
61		goto out_evsel_delete;
62	}
63
64	perf_cpu_map__for_each_cpu(cpu, idx, cpus) {
65		unsigned int ncalls = nr_openat_calls + idx;
66		/*
67		 * XXX eventually lift this restriction in a way that
68		 * keeps perf building on older glibc installations
69		 * without CPU_ALLOC. 1024 cpus in 2010 still seems
70		 * a reasonable upper limit tho :-)
71		 */
72		if (cpu.cpu >= CPU_SETSIZE) {
73			pr_debug("Ignoring CPU %d\n", cpu.cpu);
74			continue;
75		}
76
77		CPU_SET(cpu.cpu, &cpu_set);
78		if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
79			pr_debug("sched_setaffinity() failed on CPU %d: %s ",
80				 cpu.cpu,
81				 str_error_r(errno, sbuf, sizeof(sbuf)));
82			goto out_close_fd;
83		}
84		for (i = 0; i < ncalls; ++i) {
85			fd = openat(0, "/etc/passwd", O_RDONLY);
86			close(fd);
87		}
88		CPU_CLR(cpu.cpu, &cpu_set);
89	}
90
91	evsel->core.cpus = perf_cpu_map__get(cpus);
92
93	err = TEST_OK;
94
95	perf_cpu_map__for_each_cpu(cpu, idx, cpus) {
96		unsigned int expected;
97
98		if (cpu.cpu >= CPU_SETSIZE)
99			continue;
100
101		if (evsel__read_on_cpu(evsel, idx, 0) < 0) {
102			pr_debug("evsel__read_on_cpu\n");
103			err = TEST_FAIL;
104			break;
105		}
106
107		expected = nr_openat_calls + idx;
108		if (perf_counts(evsel->counts, idx, 0)->val != expected) {
109			pr_debug("evsel__read_on_cpu: expected to intercept %d calls on cpu %d, got %" PRIu64 "\n",
110				 expected, cpu.cpu, perf_counts(evsel->counts, idx, 0)->val);
111			err = TEST_FAIL;
112		}
113	}
114
115	evsel__free_counts(evsel);
116out_close_fd:
117	perf_evsel__close_fd(&evsel->core);
118out_evsel_delete:
119	evsel__delete(evsel);
120out_cpu_map_delete:
121	perf_cpu_map__put(cpus);
122out_thread_map_delete:
123	perf_thread_map__put(threads);
124	return err;
125}
126
127
128static struct test_case tests__openat_syscall_event_on_all_cpus[] = {
129	TEST_CASE_REASON("Detect openat syscall event on all cpus",
130			 openat_syscall_event_on_all_cpus,
131			 "permissions"),
132	{	.name = NULL, }
133};
134
135struct test_suite suite__openat_syscall_event_on_all_cpus = {
136	.desc = "Detect openat syscall event on all cpus",
137	.test_cases = tests__openat_syscall_event_on_all_cpus,
138};
139