3 * The struct perf_event_attr test support.
5 * This test is embedded inside into perf directly and is governed
6 * by the PERF_TEST_ATTR environment variable and hook inside
7 * sys_perf_event_open function.
9 * The general idea is to store 'struct perf_event_attr' details for
10 * each event created within single perf command. Each event details
11 * are stored into separate text file. Once perf command is finished
12 * these files can be checked for values we expect for command.
14 * Besides 'struct perf_event_attr' values we also store 'fd' and
15 * 'group_fd' values to allow checking for groups created.
17 * This all is triggered by setting PERF_TEST_ATTR environment variable.
18 * It must contain name of existing directory with access and write
19 * permissions. All the event text files are stored there.
23 * Powerpc needs __SANE_USERSPACE_TYPES__ before <linux/types.h> to select
24 * 'int-ll64.h' and avoid compile warnings when printing __u64 with %llu.
26 #define __SANE_USERSPACE_TYPES__
30 #include <linux/types.h>
31 #include <linux/kernel.h>
37 #define ENV "PERF_TEST_ATTR"
43 void test_attr__init(void)
46 test_attr__enabled = (dir != NULL);
51 #define __WRITE_ASS(str, fmt, data) \
56 size = snprintf(buf, BUFSIZE, #str "=%"fmt "\n", data); \
57 if (1 != fwrite(buf, size, 1, file)) { \
58 perror("test attr - failed to write event file"); \
65 #define WRITE_ASS(field, fmt) __WRITE_ASS(field, fmt, attr->field)
67 static int store_event(struct perf_event_attr *attr, pid_t pid, int cpu,
68 int fd, int group_fd, unsigned long flags)
73 snprintf(path, PATH_MAX, "%s/event-%d-%llu-%d", dir,
74 attr->type, attr->config, fd);
76 file = fopen(path, "w+");
78 perror("test attr - failed to open event file");
82 if (fprintf(file, "[event-%d-%llu-%d]\n",
83 attr->type, attr->config, fd) < 0) {
84 perror("test attr - failed to write event file");
89 /* syscall arguments */
90 __WRITE_ASS(fd, "d", fd);
91 __WRITE_ASS(group_fd, "d", group_fd);
92 __WRITE_ASS(cpu, "d", cpu);
93 __WRITE_ASS(pid, "d", pid);
94 __WRITE_ASS(flags, "lu", flags);
96 /* struct perf_event_attr */
97 WRITE_ASS(type, PRIu32);
98 WRITE_ASS(size, PRIu32);
99 WRITE_ASS(config, "llu");
100 WRITE_ASS(sample_period, "llu");
101 WRITE_ASS(sample_type, "llu");
102 WRITE_ASS(read_format, "llu");
103 WRITE_ASS(disabled, "d");
104 WRITE_ASS(inherit, "d");
105 WRITE_ASS(pinned, "d");
106 WRITE_ASS(exclusive, "d");
107 WRITE_ASS(exclude_user, "d");
108 WRITE_ASS(exclude_kernel, "d");
109 WRITE_ASS(exclude_hv, "d");
110 WRITE_ASS(exclude_idle, "d");
111 WRITE_ASS(mmap, "d");
112 WRITE_ASS(comm, "d");
113 WRITE_ASS(freq, "d");
114 WRITE_ASS(inherit_stat, "d");
115 WRITE_ASS(enable_on_exec, "d");
116 WRITE_ASS(task, "d");
117 WRITE_ASS(watermark, "d");
118 WRITE_ASS(precise_ip, "d");
119 WRITE_ASS(mmap_data, "d");
120 WRITE_ASS(sample_id_all, "d");
121 WRITE_ASS(exclude_host, "d");
122 WRITE_ASS(exclude_guest, "d");
123 WRITE_ASS(exclude_callchain_kernel, "d");
124 WRITE_ASS(exclude_callchain_user, "d");
125 WRITE_ASS(wakeup_events, PRIu32);
126 WRITE_ASS(bp_type, PRIu32);
127 WRITE_ASS(config1, "llu");
128 WRITE_ASS(config2, "llu");
129 WRITE_ASS(branch_sample_type, "llu");
130 WRITE_ASS(sample_regs_user, "llu");
131 WRITE_ASS(sample_stack_user, PRIu32);
137 void test_attr__open(struct perf_event_attr *attr, pid_t pid, int cpu,
138 int fd, int group_fd, unsigned long flags)
140 int errno_saved = errno;
142 if (store_event(attr, pid, cpu, fd, group_fd, flags))
143 die("test attr FAILED");
148 static int run_dir(const char *d, const char *perf)
150 char cmd[3*PATH_MAX];
152 snprintf(cmd, 3*PATH_MAX, PYTHON " %s/attr.py -d %s/attr/ -p %s %s",
153 d, d, perf, verbose ? "-v" : "");
161 char path_perf[PATH_MAX];
162 char path_dir[PATH_MAX];
164 /* First try developement tree tests. */
165 if (!lstat("./tests", &st))
166 return run_dir("./tests", "./perf");
168 /* Then installed path. */
169 snprintf(path_dir, PATH_MAX, "%s/tests", perf_exec_path());
170 snprintf(path_perf, PATH_MAX, "%s/perf", BINDIR);
172 if (!lstat(path_dir, &st) &&
173 !lstat(path_perf, &st))
174 return run_dir(path_dir, path_perf);
176 fprintf(stderr, " (ommitted)");