4336cc15b9
The canonical location for the tracefs filesystem is at /sys/kernel/tracing. But, from Documentation/trace/ftrace.rst: Before 4.1, all ftrace tracing control files were within the debugfs file system, which is typically located at /sys/kernel/debug/tracing. For backward compatibility, when mounting the debugfs file system, the tracefs file system will be automatically mounted at: /sys/kernel/debug/tracing A few spots in tools/testing/selftests still refer to this older debugfs path, so let's update them to avoid confusion. Link: https://lkml.kernel.org/r/20230313211746.1541525-1-zwisler@kernel.org Cc: "Tobin C. Harding" <me@tobin.cc> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Shuah Khan <shuah@kernel.org> Cc: Tycho Andersen <tycho@tycho.pizza> Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org> Reviewed-by: Mukesh Ojha <quic_mojha@quicinc.com> Signed-off-by: Ross Zwisler <zwisler@google.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
131 lines
3.3 KiB
C
131 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* User Events Dyn Events Test Program
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*
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* Copyright (c) 2021 Beau Belgrave <beaub@linux.microsoft.com>
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*/
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#include <errno.h>
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#include <linux/user_events.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "../kselftest_harness.h"
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const char *dyn_file = "/sys/kernel/tracing/dynamic_events";
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const char *clear = "!u:__test_event";
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static int Append(const char *value)
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{
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int fd = open(dyn_file, O_RDWR | O_APPEND);
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int ret = write(fd, value, strlen(value));
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close(fd);
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return ret;
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}
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#define CLEAR() \
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do { \
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int ret = Append(clear); \
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if (ret == -1) \
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ASSERT_EQ(ENOENT, errno); \
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} while (0)
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#define TEST_PARSE(x) \
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do { \
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ASSERT_NE(-1, Append(x)); \
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CLEAR(); \
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} while (0)
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#define TEST_NPARSE(x) ASSERT_EQ(-1, Append(x))
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FIXTURE(user) {
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};
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FIXTURE_SETUP(user) {
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CLEAR();
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}
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FIXTURE_TEARDOWN(user) {
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CLEAR();
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}
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TEST_F(user, basic_types) {
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/* All should work */
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TEST_PARSE("u:__test_event u64 a");
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TEST_PARSE("u:__test_event u32 a");
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TEST_PARSE("u:__test_event u16 a");
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TEST_PARSE("u:__test_event u8 a");
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TEST_PARSE("u:__test_event char a");
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TEST_PARSE("u:__test_event unsigned char a");
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TEST_PARSE("u:__test_event int a");
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TEST_PARSE("u:__test_event unsigned int a");
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TEST_PARSE("u:__test_event short a");
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TEST_PARSE("u:__test_event unsigned short a");
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TEST_PARSE("u:__test_event char[20] a");
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TEST_PARSE("u:__test_event unsigned char[20] a");
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TEST_PARSE("u:__test_event char[0x14] a");
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TEST_PARSE("u:__test_event unsigned char[0x14] a");
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/* Bad size format should fail */
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TEST_NPARSE("u:__test_event char[aa] a");
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/* Large size should fail */
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TEST_NPARSE("u:__test_event char[9999] a");
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/* Long size string should fail */
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TEST_NPARSE("u:__test_event char[0x0000000000001] a");
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}
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TEST_F(user, loc_types) {
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/* All should work */
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TEST_PARSE("u:__test_event __data_loc char[] a");
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TEST_PARSE("u:__test_event __data_loc unsigned char[] a");
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TEST_PARSE("u:__test_event __rel_loc char[] a");
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TEST_PARSE("u:__test_event __rel_loc unsigned char[] a");
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}
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TEST_F(user, size_types) {
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/* Should work */
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TEST_PARSE("u:__test_event struct custom a 20");
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/* Size not specified on struct should fail */
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TEST_NPARSE("u:__test_event struct custom a");
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/* Size specified on non-struct should fail */
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TEST_NPARSE("u:__test_event char a 20");
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}
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TEST_F(user, flags) {
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/* Should work */
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TEST_PARSE("u:__test_event:BPF_ITER u32 a");
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/* Forward compat */
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TEST_PARSE("u:__test_event:BPF_ITER,FLAG_FUTURE u32 a");
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}
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TEST_F(user, matching) {
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/* Register */
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ASSERT_NE(-1, Append("u:__test_event struct custom a 20"));
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/* Should not match */
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TEST_NPARSE("!u:__test_event struct custom b");
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/* Should match */
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TEST_PARSE("!u:__test_event struct custom a");
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/* Multi field reg */
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ASSERT_NE(-1, Append("u:__test_event u32 a; u32 b"));
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/* Non matching cases */
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TEST_NPARSE("!u:__test_event u32 a");
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TEST_NPARSE("!u:__test_event u32 b");
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TEST_NPARSE("!u:__test_event u32 a; u32 ");
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TEST_NPARSE("!u:__test_event u32 a; u32 a");
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/* Matching case */
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TEST_PARSE("!u:__test_event u32 a; u32 b");
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/* Register */
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ASSERT_NE(-1, Append("u:__test_event u32 a; u32 b"));
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/* Ensure trailing semi-colon case */
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TEST_PARSE("!u:__test_event u32 a; u32 b;");
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}
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int main(int argc, char **argv)
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{
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return test_harness_run(argc, argv);
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}
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