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
32 extern int verbose;
33
34 static char *dir;
35
test_attr__init(void)36 void 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) \
45 do { \
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
store_event(struct perf_event_attr * attr,pid_t pid,int cpu,int fd,int group_fd,unsigned long flags)60 static 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
test_attr__open(struct perf_event_attr * attr,pid_t pid,int cpu,int fd,int group_fd,unsigned long flags)130 void 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
run_dir(const char * d,const char * perf)141 static 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 scnprintf(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) ? TEST_FAIL : TEST_OK;
154 }
155
test__attr(void)156 int 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 return TEST_SKIP;
175 }
176