tools/perf/tests/attr.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * The struct perf_event_attr test support.
   4  *
   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.
   8  *
   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.
  13  *
  14  * Besides 'struct perf_event_attr' values we also store 'fd' and
  15  * 'group_fd' values to allow checking for groups created.
  16  *
  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.
  20  */
  21
  22 #include <debug.h>
  23 #include <errno.h>
  24 #include <inttypes.h>
  25 #include <stdlib.h>
  26 #include <stdio.h>
  27 #include <linux/types.h>
  28 #include <linux/kernel.h>
  29 #include <sys/param.h>
  30 #include <sys/types.h>
  31 #include <sys/stat.h>
  32 #include <unistd.h>
  33 #include <subcmd/exec-cmd.h>
  34 #include "event.h"
  35 #include "util.h"
  36 #include "tests.h"
  37
  38 #define ENV "PERF_TEST_ATTR"
  39
  40 static char *dir;
  41 static bool ready;
  42
  43 void test_attr__init(void)
  44 {
  45         dir = getenv(ENV);
  46         test_attr__enabled = (dir != NULL);
  47 }
  48
  49 #define BUFSIZE 1024
  50
  51 #define __WRITE_ASS(str, fmt, data)                                     \
  52 do {                                                                    \
  53         char buf[BUFSIZE];                                              \
  54         size_t size;                                                    \
  55                                                                         \
  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");       \
  59                 fclose(file);                                           \
  60                 return -1;                                              \
  61         }                                                               \
  62                                                                         \
  63 } while (0)
  64
  65 #define WRITE_ASS(field, fmt) __WRITE_ASS(field, fmt, attr->field)
  66
  67 static int store_event(struct perf_event_attr *attr, pid_t pid, int cpu,
  68                        int fd, int group_fd, unsigned long flags)
  69 {
  70         FILE *file;
  71         char path[PATH_MAX];
  72
  73         if (!ready)
  74                 return 0;
  75
  76         snprintf(path, PATH_MAX, "%s/event-%d-%llu-%d", dir,
  77                  attr->type, attr->config, fd);
  78
  79         file = fopen(path, "w+");
  80         if (!file) {
  81                 perror("test attr - failed to open event file");
  82                 return -1;
  83         }
  84
  85         if (fprintf(file, "[event-%d-%llu-%d]\n",
  86                     attr->type, attr->config, fd) < 0) {
  87                 perror("test attr - failed to write event file");
  88                 fclose(file);
  89                 return -1;
  90         }
  91
  92         /* syscall arguments */
  93         __WRITE_ASS(fd,       "d", fd);
  94         __WRITE_ASS(group_fd, "d", group_fd);
  95         __WRITE_ASS(cpu,      "d", cpu);
  96         __WRITE_ASS(pid,      "d", pid);
  97         __WRITE_ASS(flags,   "lu", flags);
  98
  99         /* struct perf_event_attr */
 100         WRITE_ASS(type,   PRIu32);
 101         WRITE_ASS(size,   PRIu32);
 102         WRITE_ASS(config,  "llu");
 103         WRITE_ASS(sample_period, "llu");
 104         WRITE_ASS(sample_type,   "llu");
 105         WRITE_ASS(read_format,   "llu");
 106         WRITE_ASS(disabled,       "d");
 107         WRITE_ASS(inherit,        "d");
 108         WRITE_ASS(pinned,         "d");
 109         WRITE_ASS(exclusive,      "d");
 110         WRITE_ASS(exclude_user,   "d");
 111         WRITE_ASS(exclude_kernel, "d");
 112         WRITE_ASS(exclude_hv,     "d");
 113         WRITE_ASS(exclude_idle,   "d");
 114         WRITE_ASS(mmap,           "d");
 115         WRITE_ASS(comm,           "d");
 116         WRITE_ASS(freq,           "d");
 117         WRITE_ASS(inherit_stat,   "d");
 118         WRITE_ASS(enable_on_exec, "d");
 119         WRITE_ASS(task,           "d");
 120         WRITE_ASS(watermark,      "d");
 121         WRITE_ASS(precise_ip,     "d");
 122         WRITE_ASS(mmap_data,      "d");
 123         WRITE_ASS(sample_id_all,  "d");
 124         WRITE_ASS(exclude_host,   "d");
 125         WRITE_ASS(exclude_guest,  "d");
 126         WRITE_ASS(exclude_callchain_kernel, "d");
 127         WRITE_ASS(exclude_callchain_user, "d");
 128         WRITE_ASS(mmap2,          "d");
 129         WRITE_ASS(comm_exec,      "d");
 130         WRITE_ASS(context_switch, "d");
 131         WRITE_ASS(write_backward, "d");
 132         WRITE_ASS(namespaces,     "d");
 133         WRITE_ASS(use_clockid,    "d");
 134         WRITE_ASS(wakeup_events, PRIu32);
 135         WRITE_ASS(bp_type, PRIu32);
 136         WRITE_ASS(config1, "llu");
 137         WRITE_ASS(config2, "llu");
 138         WRITE_ASS(branch_sample_type, "llu");
 139         WRITE_ASS(sample_regs_user,   "llu");
 140         WRITE_ASS(sample_stack_user,  PRIu32);
 141
 142         fclose(file);
 143         return 0;
 144 }
 145
 146 void test_attr__open(struct perf_event_attr *attr, pid_t pid, int cpu,
 147                      int fd, int group_fd, unsigned long flags)
 148 {
 149         int errno_saved = errno;
 150
 151         if ((fd != -1) && store_event(attr, pid, cpu, fd, group_fd, flags)) {
 152                 pr_err("test attr FAILED");
 153                 exit(128);
 154         }
 155
 156         errno = errno_saved;
 157 }
 158
 159 void test_attr__ready(void)
 160 {
 161         if (unlikely(test_attr__enabled) && !ready)
 162                 ready = true;
 163 }
 164
 165 static int run_dir(const char *d, const char *perf)
 166 {
 167         char v[] = "-vvvvv";
 168         int vcnt = min(verbose, (int) sizeof(v) - 1);
 169         char cmd[3*PATH_MAX];
 170
 171         if (verbose > 0)
 172                 vcnt++;
 173
 174         scnprintf(cmd, 3*PATH_MAX, PYTHON " %s/attr.py -d %s/attr/ -p %s %.*s",
 175                   d, d, perf, vcnt, v);
 176
 177         return system(cmd) ? TEST_FAIL : TEST_OK;
 178 }
 179
 180 int test__attr(struct test *test __maybe_unused, int subtest __maybe_unused)
 181 {
 182         struct stat st;
 183         char path_perf[PATH_MAX];
 184         char path_dir[PATH_MAX];
 185
 186         /* First try development tree tests. */
 187         if (!lstat("./tests", &st))
 188                 return run_dir("./tests", "./perf");
 189
 190         /* Then installed path. */
 191         snprintf(path_dir,  PATH_MAX, "%s/tests", get_argv_exec_path());
 192         snprintf(path_perf, PATH_MAX, "%s/perf", BINDIR);
 193
 194         if (!lstat(path_dir, &st) &&
 195             !lstat(path_perf, &st))
 196                 return run_dir(path_dir, path_perf);
 197
 198         return TEST_SKIP;
 199 }