1/*
2 * The struct perf_event_attr test support.
3 *
4 * This test is embedded inside into perf directly and is governed
5 * by the PERF_TEST_ATTR environment variable and hook inside
6 * sys_perf_event_open function.
7 *
8 * The general idea is to store 'struct perf_event_attr' details for
9 * each event created within single perf command. Each event details
10 * are stored into separate text file. Once perf command is finished
11 * these files can be checked for values we expect for command.
12 *
13 * Besides 'struct perf_event_attr' values we also store 'fd' and
14 * 'group_fd' values to allow checking for groups created.
15 *
16 * This all is triggered by setting PERF_TEST_ATTR environment variable.
17 * It must contain name of existing directory with access and write
18 * permissions. All the event text files are stored there.
19 */
20
21#include <stdlib.h>
22#include <stdio.h>
23#include <linux/types.h>
24#include <linux/kernel.h>
25#include "../perf.h"
26#include "util.h"
27#include "exec_cmd.h"
28#include "tests.h"
29
30#define ENV "PERF_TEST_ATTR"
31
32extern int verbose;
33
34static char *dir;
35
36void test_attr__init(void)
37{
38	dir = getenv(ENV);
39	test_attr__enabled = (dir != NULL);
40}
41
42#define BUFSIZE 1024
43
44#define __WRITE_ASS(str, fmt, data)					\
45do {									\
46	char buf[BUFSIZE];						\
47	size_t size;							\
48									\
49	size = snprintf(buf, BUFSIZE, #str "=%"fmt "\n", data);		\
50	if (1 != fwrite(buf, size, 1, file)) {				\
51		perror("test attr - failed to write event file");	\
52		fclose(file);						\
53		return -1;						\
54	}								\
55									\
56} while (0)
57
58#define WRITE_ASS(field, fmt) __WRITE_ASS(field, fmt, attr->field)
59
60static int store_event(struct perf_event_attr *attr, pid_t pid, int cpu,
61		       int fd, int group_fd, unsigned long flags)
62{
63	FILE *file;
64	char path[PATH_MAX];
65
66	snprintf(path, PATH_MAX, "%s/event-%d-%llu-%d", dir,
67		 attr->type, attr->config, fd);
68
69	file = fopen(path, "w+");
70	if (!file) {
71		perror("test attr - failed to open event file");
72		return -1;
73	}
74
75	if (fprintf(file, "[event-%d-%llu-%d]\n",
76		    attr->type, attr->config, fd) < 0) {
77		perror("test attr - failed to write event file");
78		fclose(file);
79		return -1;
80	}
81
82	/* syscall arguments */
83	__WRITE_ASS(fd,       "d", fd);
84	__WRITE_ASS(group_fd, "d", group_fd);
85	__WRITE_ASS(cpu,      "d", cpu);
86	__WRITE_ASS(pid,      "d", pid);
87	__WRITE_ASS(flags,   "lu", flags);
88
89	/* struct perf_event_attr */
90	WRITE_ASS(type,   PRIu32);
91	WRITE_ASS(size,   PRIu32);
92	WRITE_ASS(config,  "llu");
93	WRITE_ASS(sample_period, "llu");
94	WRITE_ASS(sample_type,   "llu");
95	WRITE_ASS(read_format,   "llu");
96	WRITE_ASS(disabled,       "d");
97	WRITE_ASS(inherit,        "d");
98	WRITE_ASS(pinned,         "d");
99	WRITE_ASS(exclusive,      "d");
100	WRITE_ASS(exclude_user,   "d");
101	WRITE_ASS(exclude_kernel, "d");
102	WRITE_ASS(exclude_hv,     "d");
103	WRITE_ASS(exclude_idle,   "d");
104	WRITE_ASS(mmap,           "d");
105	WRITE_ASS(comm,           "d");
106	WRITE_ASS(freq,           "d");
107	WRITE_ASS(inherit_stat,   "d");
108	WRITE_ASS(enable_on_exec, "d");
109	WRITE_ASS(task,           "d");
110	WRITE_ASS(watermark,      "d");
111	WRITE_ASS(precise_ip,     "d");
112	WRITE_ASS(mmap_data,      "d");
113	WRITE_ASS(sample_id_all,  "d");
114	WRITE_ASS(exclude_host,   "d");
115	WRITE_ASS(exclude_guest,  "d");
116	WRITE_ASS(exclude_callchain_kernel, "d");
117	WRITE_ASS(exclude_callchain_user, "d");
118	WRITE_ASS(wakeup_events, PRIu32);
119	WRITE_ASS(bp_type, PRIu32);
120	WRITE_ASS(config1, "llu");
121	WRITE_ASS(config2, "llu");
122	WRITE_ASS(branch_sample_type, "llu");
123	WRITE_ASS(sample_regs_user,   "llu");
124	WRITE_ASS(sample_stack_user,  PRIu32);
125
126	fclose(file);
127	return 0;
128}
129
130void test_attr__open(struct perf_event_attr *attr, pid_t pid, int cpu,
131		     int fd, int group_fd, unsigned long flags)
132{
133	int errno_saved = errno;
134
135	if (store_event(attr, pid, cpu, fd, group_fd, flags))
136		die("test attr FAILED");
137
138	errno = errno_saved;
139}
140
141static int run_dir(const char *d, const char *perf)
142{
143	char v[] = "-vvvvv";
144	int vcnt = min(verbose, (int) sizeof(v) - 1);
145	char cmd[3*PATH_MAX];
146
147	if (verbose)
148		vcnt++;
149
150	snprintf(cmd, 3*PATH_MAX, PYTHON " %s/attr.py -d %s/attr/ -p %s %.*s",
151		 d, d, perf, vcnt, v);
152
153	return system(cmd);
154}
155
156int test__attr(void)
157{
158	struct stat st;
159	char path_perf[PATH_MAX];
160	char path_dir[PATH_MAX];
161
162	/* First try developement tree tests. */
163	if (!lstat("./tests", &st))
164		return run_dir("./tests", "./perf");
165
166	/* Then installed path. */
167	snprintf(path_dir,  PATH_MAX, "%s/tests", perf_exec_path());
168	snprintf(path_perf, PATH_MAX, "%s/perf", BINDIR);
169
170	if (!lstat(path_dir, &st) &&
171	    !lstat(path_perf, &st))
172		return run_dir(path_dir, path_perf);
173
174	fprintf(stderr, " (omitted)");
175	return 0;
176}
177