2 * The struct perf_event_attr test support.
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.
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.
13 * Besides 'struct perf_event_attr' values we also store 'fd' and
14 * 'group_fd' values to allow checking for groups created.
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.
25 #include <linux/types.h>
26 #include <linux/kernel.h>
27 #include <sys/param.h>
30 #include <subcmd/exec-cmd.h>
33 #define ENV "PERF_TEST_ATTR"
39 void test_attr__init(void)
42 test_attr__enabled = (dir != NULL);
47 #define __WRITE_ASS(str, fmt, data) \
52 size = snprintf(buf, BUFSIZE, #str "=%"fmt "\n", data); \
53 if (1 != fwrite(buf, size, 1, file)) { \
54 perror("test attr - failed to write event file"); \
61 #define WRITE_ASS(field, fmt) __WRITE_ASS(field, fmt, attr->field)
63 static int store_event(struct perf_event_attr *attr, pid_t pid, int cpu,
64 int fd, int group_fd, unsigned long flags)
69 snprintf(path, PATH_MAX, "%s/event-%d-%llu-%d", dir,
70 attr->type, attr->config, fd);
72 file = fopen(path, "w+");
74 perror("test attr - failed to open event file");
78 if (fprintf(file, "[event-%d-%llu-%d]\n",
79 attr->type, attr->config, fd) < 0) {
80 perror("test attr - failed to write event file");
85 /* syscall arguments */
86 __WRITE_ASS(fd, "d", fd);
87 __WRITE_ASS(group_fd, "d", group_fd);
88 __WRITE_ASS(cpu, "d", cpu);
89 __WRITE_ASS(pid, "d", pid);
90 __WRITE_ASS(flags, "lu", flags);
92 /* struct perf_event_attr */
93 WRITE_ASS(type, PRIu32);
94 WRITE_ASS(size, PRIu32);
95 WRITE_ASS(config, "llu");
96 WRITE_ASS(sample_period, "llu");
97 WRITE_ASS(sample_type, "llu");
98 WRITE_ASS(read_format, "llu");
99 WRITE_ASS(disabled, "d");
100 WRITE_ASS(inherit, "d");
101 WRITE_ASS(pinned, "d");
102 WRITE_ASS(exclusive, "d");
103 WRITE_ASS(exclude_user, "d");
104 WRITE_ASS(exclude_kernel, "d");
105 WRITE_ASS(exclude_hv, "d");
106 WRITE_ASS(exclude_idle, "d");
107 WRITE_ASS(mmap, "d");
108 WRITE_ASS(comm, "d");
109 WRITE_ASS(freq, "d");
110 WRITE_ASS(inherit_stat, "d");
111 WRITE_ASS(enable_on_exec, "d");
112 WRITE_ASS(task, "d");
113 WRITE_ASS(watermark, "d");
114 WRITE_ASS(precise_ip, "d");
115 WRITE_ASS(mmap_data, "d");
116 WRITE_ASS(sample_id_all, "d");
117 WRITE_ASS(exclude_host, "d");
118 WRITE_ASS(exclude_guest, "d");
119 WRITE_ASS(exclude_callchain_kernel, "d");
120 WRITE_ASS(exclude_callchain_user, "d");
121 WRITE_ASS(wakeup_events, PRIu32);
122 WRITE_ASS(bp_type, PRIu32);
123 WRITE_ASS(config1, "llu");
124 WRITE_ASS(config2, "llu");
125 WRITE_ASS(branch_sample_type, "llu");
126 WRITE_ASS(sample_regs_user, "llu");
127 WRITE_ASS(sample_stack_user, PRIu32);
133 void test_attr__open(struct perf_event_attr *attr, pid_t pid, int cpu,
134 int fd, int group_fd, unsigned long flags)
136 int errno_saved = errno;
138 if (store_event(attr, pid, cpu, fd, group_fd, flags))
139 die("test attr FAILED");
144 static int run_dir(const char *d, const char *perf)
147 int vcnt = min(verbose, (int) sizeof(v) - 1);
148 char cmd[3*PATH_MAX];
153 snprintf(cmd, 3*PATH_MAX, PYTHON " %s/attr.py -d %s/attr/ -p %s %.*s",
154 d, d, perf, vcnt, v);
159 int test__attr(int subtest __maybe_unused)
162 char path_perf[PATH_MAX];
163 char path_dir[PATH_MAX];
165 /* First try developement tree tests. */
166 if (!lstat("./tests", &st))
167 return run_dir("./tests", "./perf");
169 /* Then installed path. */
170 snprintf(path_dir, PATH_MAX, "%s/tests", get_argv_exec_path());
171 snprintf(path_perf, PATH_MAX, "%s/perf", BINDIR);
173 if (!lstat(path_dir, &st) &&
174 !lstat(path_perf, &st))
175 return run_dir(path_dir, path_perf);