tools/perf/tests/attr.c

   1
   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 <stdlib.h>
  23 #include <stdio.h>
  24 #include <inttypes.h>
  25 #include <linux/types.h>
  26 #include <linux/kernel.h>
  27 #include "../perf.h"
  28 #include "util.h"
  29 #include "exec_cmd.h"
  30 #include "tests.h"
  31
  32 #define ENV "PERF_TEST_ATTR"
  33
  34 extern int verbose;
  35
  36 bool test_attr__enabled;
  37
  38 static char *dir;
  39
  40 void test_attr__init(void)
  41 {
  42         dir = getenv(ENV);
  43         test_attr__enabled = (dir != NULL);
  44 }
  45
  46 #define BUFSIZE 1024
  47
  48 #define __WRITE_ASS(str, fmt, data)                                     \
  49 do {                                                                    \
  50         char buf[BUFSIZE];                                              \
  51         size_t size;                                                    \
  52                                                                         \
  53         size = snprintf(buf, BUFSIZE, #str "=%"fmt "\n", data);         \
  54         if (1 != fwrite(buf, size, 1, file)) {                          \
  55                 perror("test attr - failed to write event file");       \
  56                 fclose(file);                                           \
  57                 return -1;                                              \
  58         }                                                               \
  59                                                                         \
  60 } while (0)
  61
  62 #define WRITE_ASS(field, fmt) __WRITE_ASS(field, fmt, attr->field)
  63
  64 static int store_event(struct perf_event_attr *attr, pid_t pid, int cpu,
  65                        int fd, int group_fd, unsigned long flags)
  66 {
  67         FILE *file;
  68         char path[PATH_MAX];
  69
  70         snprintf(path, PATH_MAX, "%s/event-%d-%llu-%d", dir,
  71                  attr->type, attr->config, fd);
  72
  73         file = fopen(path, "w+");
  74         if (!file) {
  75                 perror("test attr - failed to open event file");
  76                 return -1;
  77         }
  78
  79         if (fprintf(file, "[event-%d-%llu-%d]\n",
  80                     attr->type, attr->config, fd) < 0) {
  81                 perror("test attr - failed to write event file");
  82                 fclose(file);
  83                 return -1;
  84         }
  85
  86         /* syscall arguments */
  87         __WRITE_ASS(fd,       "d", fd);
  88         __WRITE_ASS(group_fd, "d", group_fd);
  89         __WRITE_ASS(cpu,      "d", cpu);
  90         __WRITE_ASS(pid,      "d", pid);
  91         __WRITE_ASS(flags,   "lu", flags);
  92
  93         /* struct perf_event_attr */
  94         WRITE_ASS(type,   PRIu32);
  95         WRITE_ASS(size,   PRIu32);
  96         WRITE_ASS(config,  "llu");
  97         WRITE_ASS(sample_period, "llu");
  98         WRITE_ASS(sample_type,   "llu");
  99         WRITE_ASS(read_format,   "llu");
 100         WRITE_ASS(disabled,       "d");
 101         WRITE_ASS(inherit,        "d");
 102         WRITE_ASS(pinned,         "d");
 103         WRITE_ASS(exclusive,      "d");
 104         WRITE_ASS(exclude_user,   "d");
 105         WRITE_ASS(exclude_kernel, "d");
 106         WRITE_ASS(exclude_hv,     "d");
 107         WRITE_ASS(exclude_idle,   "d");
 108         WRITE_ASS(mmap,           "d");
 109         WRITE_ASS(comm,           "d");
 110         WRITE_ASS(freq,           "d");
 111         WRITE_ASS(inherit_stat,   "d");
 112         WRITE_ASS(enable_on_exec, "d");
 113         WRITE_ASS(task,           "d");
 114         WRITE_ASS(watermark,      "d");
 115         WRITE_ASS(precise_ip,     "d");
 116         WRITE_ASS(mmap_data,      "d");
 117         WRITE_ASS(sample_id_all,  "d");
 118         WRITE_ASS(exclude_host,   "d");
 119         WRITE_ASS(exclude_guest,  "d");
 120         WRITE_ASS(exclude_callchain_kernel, "d");
 121         WRITE_ASS(exclude_callchain_user, "d");
 122         WRITE_ASS(wakeup_events, PRIu32);
 123         WRITE_ASS(bp_type, PRIu32);
 124         WRITE_ASS(config1, "llu");
 125         WRITE_ASS(config2, "llu");
 126         WRITE_ASS(branch_sample_type, "llu");
 127         WRITE_ASS(sample_regs_user,   "llu");
 128         WRITE_ASS(sample_stack_user,  PRIu32);
 129
 130         fclose(file);
 131         return 0;
 132 }
 133
 134 void test_attr__open(struct perf_event_attr *attr, pid_t pid, int cpu,
 135                      int fd, int group_fd, unsigned long flags)
 136 {
 137         int errno_saved = errno;
 138
 139         if (store_event(attr, pid, cpu, fd, group_fd, flags))
 140                 die("test attr FAILED");
 141
 142         errno = errno_saved;
 143 }
 144
 145 static int run_dir(const char *d, const char *perf)
 146 {
 147         char cmd[3*PATH_MAX];
 148
 149         snprintf(cmd, 3*PATH_MAX, "python %s/attr.py -d %s/attr/ -p %s %s",
 150                  d, d, perf, verbose ? "-v" : "");
 151
 152         return system(cmd);
 153 }
 154
 155 int test__attr(void)
 156 {
 157         struct stat st;
 158         char path_perf[PATH_MAX];
 159         char path_dir[PATH_MAX];
 160
 161         /* First try developement tree tests. */
 162         if (!lstat("./tests", &st))
 163                 return run_dir("./tests", "./perf");
 164
 165         /* Then installed path. */
 166         snprintf(path_dir,  PATH_MAX, "%s/tests", perf_exec_path());
 167         snprintf(path_perf, PATH_MAX, "%s/perf", BINDIR);
 168
 169         if (!lstat(path_dir, &st) &&
 170             !lstat(path_perf, &st))
 171                 return run_dir(path_dir, path_perf);
 172
 173         fprintf(stderr, " (ommitted)");
 174         return 0;
 175 }