kernel/tools/perf/tests/attr.c

   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
  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
  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
 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
 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         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
 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         fprintf(stderr, " (omitted)");
 175         return 0;
 176 }