// SPDX-License-Identifier: GPL-2.0
/*
* User Events Dyn Events Test Program
*
* Copyright (c) 2021 Beau Belgrave <[email protected]>
*/
#include <errno.h>
#include <linux/user_events.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <unistd.h>
#include "../kselftest_harness.h"
#include "user_events_selftests.h"
const char *dyn_file = "/sys/kernel/tracing/dynamic_events";
const char *abi_file = "/sys/kernel/tracing/user_events_data";
const char *enable_file = "/sys/kernel/tracing/events/user_events/__test_event/enable";
static int event_delete(void)
{
int fd = open(abi_file, O_RDWR);
int ret;
if (fd < 0)
return -1;
ret = ioctl(fd, DIAG_IOCSDEL, "__test_event");
close(fd);
return ret;
}
static bool wait_for_delete(void)
{
int i;
for (i = 0; i < 1000; ++i) {
int fd = open(enable_file, O_RDONLY);
if (fd == -1)
return true;
close(fd);
usleep(1000);
}
return false;
}
static int reg_event(int fd, int *check, int bit, const char *value)
{
struct user_reg reg = {0};
reg.size = sizeof(reg);
reg.name_args = (__u64)value;
reg.enable_bit = bit;
reg.enable_addr = (__u64)check;
reg.enable_size = sizeof(*check);
if (ioctl(fd, DIAG_IOCSREG, ®) == -1)
return -1;
return 0;
}
static int unreg_event(int fd, int *check, int bit)
{
struct user_unreg unreg = {0};
unreg.size = sizeof(unreg);
unreg.disable_bit = bit;
unreg.disable_addr = (__u64)check;
return ioctl(fd, DIAG_IOCSUNREG, &unreg);
}
static int parse_dyn(const char *value)
{
int fd = open(dyn_file, O_RDWR | O_APPEND);
int len = strlen(value);
int ret;
if (fd == -1)
return -1;
ret = write(fd, value, len);
if (ret == len)
ret = 0;
else
ret = -1;
close(fd);
if (ret == 0)
event_delete();
return ret;
}
static int parse_abi(int *check, const char *value)
{
int fd = open(abi_file, O_RDWR);
int ret;
if (fd == -1)
return -1;
/* Until we have persist flags via dynamic events, use the base name */
if (value[0] != 'u' || value[1] != ':') {
close(fd);
return -1;
}
ret = reg_event(fd, check, 31, value + 2);
if (ret != -1) {
if (unreg_event(fd, check, 31) == -1)
printf("WARN: Couldn't unreg event\n");
}
close(fd);
return ret;
}
static int parse(int *check, const char *value)
{
int abi_ret = parse_abi(check, value);
int dyn_ret = parse_dyn(value);
/* Ensure both ABI and DYN parse the same way */
if (dyn_ret != abi_ret)
return -1;
return dyn_ret;
}
static int check_match(int *check, const char *first, const char *second, bool *match)
{
int fd = open(abi_file, O_RDWR);
int ret = -1;
if (fd == -1)
return -1;
if (reg_event(fd, check, 31, first) == -1)
goto cleanup;
if (reg_event(fd, check, 30, second) == -1) {
if (errno == EADDRINUSE) {
/* Name is in use, with different fields */
*match = false;
ret = 0;
}
goto cleanup;
}
*match = true;
ret = 0;
cleanup:
unreg_event(fd, check, 31);
unreg_event(fd, check, 30);
close(fd);
wait_for_delete();
return ret;
}
#define TEST_MATCH(x, y) \
do { \
bool match; \
ASSERT_NE(-1, check_match(&self->check, x, y, &match)); \
ASSERT_EQ(true, match); \
} while (0)
#define TEST_NMATCH(x, y) \
do { \
bool match; \
ASSERT_NE(-1, check_match(&self->check, x, y, &match)); \
ASSERT_EQ(false, match); \
} while (0)
#define TEST_PARSE(x) ASSERT_NE(-1, parse(&self->check, x))
#define TEST_NPARSE(x) ASSERT_EQ(-1, parse(&self->check, x))
FIXTURE(user) {
int check;
bool umount;
};
FIXTURE_SETUP(user) {
USER_EVENT_FIXTURE_SETUP(return, self->umount);
}
FIXTURE_TEARDOWN(user) {
USER_EVENT_FIXTURE_TEARDOWN(self->umount);
wait_for_delete();
}
TEST_F(user, basic_types) {
/* All should work */
TEST_PARSE("u:__test_event u64 a");
TEST_PARSE("u:__test_event u32 a");
TEST_PARSE("u:__test_event u16 a");
TEST_PARSE("u:__test_event u8 a");
TEST_PARSE("u:__test_event char a");
TEST_PARSE("u:__test_event unsigned char a");
TEST_PARSE("u:__test_event int a");
TEST_PARSE("u:__test_event unsigned int a");
TEST_PARSE("u:__test_event short a");
TEST_PARSE("u:__test_event unsigned short a");
TEST_PARSE("u:__test_event char[20] a");
TEST_PARSE("u:__test_event unsigned char[20] a");
TEST_PARSE("u:__test_event char[0x14] a");
TEST_PARSE("u:__test_event unsigned char[0x14] a");
/* Bad size format should fail */
TEST_NPARSE("u:__test_event char[aa] a");
/* Large size should fail */
TEST_NPARSE("u:__test_event char[9999] a");
/* Long size string should fail */
TEST_NPARSE("u:__test_event char[0x0000000000001] a");
}
TEST_F(user, loc_types) {
/* All should work */
TEST_PARSE("u:__test_event __data_loc char[] a");
TEST_PARSE("u:__test_event __data_loc unsigned char[] a");
TEST_PARSE("u:__test_event __rel_loc char[] a");
TEST_PARSE("u:__test_event __rel_loc unsigned char[] a");
}
TEST_F(user, size_types) {
/* Should work */
TEST_PARSE("u:__test_event struct custom a 20");
/* Size not specified on struct should fail */
TEST_NPARSE("u:__test_event struct custom a");
/* Size specified on non-struct should fail */
TEST_NPARSE("u:__test_event char a 20");
}
TEST_F(user, matching) {
/* Single name matches */
TEST_MATCH("__test_event u32 a",
"__test_event u32 a");
/* Multiple names match */
TEST_MATCH("__test_event u32 a; u32 b",
"__test_event u32 a; u32 b");
/* Multiple names match with dangling ; */
TEST_MATCH("__test_event u32 a; u32 b",
"__test_event u32 a; u32 b;");
/* Single name doesn't match */
TEST_NMATCH("__test_event u32 a",
"__test_event u32 b");
/* Multiple names don't match */
TEST_NMATCH("__test_event u32 a; u32 b",
"__test_event u32 b; u32 a");
/* Types don't match */
TEST_NMATCH("__test_event u64 a; u64 b",
"__test_event u32 a; u32 b");
/* Struct name and size matches */
TEST_MATCH("__test_event struct my_struct a 20",
"__test_event struct my_struct a 20");
/* Struct name don't match */
TEST_NMATCH("__test_event struct my_struct a 20",
"__test_event struct my_struct b 20");
/* Struct size don't match */
TEST_NMATCH("__test_event struct my_struct a 20",
"__test_event struct my_struct a 21");
}
int main(int argc, char **argv)
{
return test_harness_run(argc, argv);
}
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