blob: ec8a3bb981b92489a1160b0457d7af5495cbad5c [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
/*
* An API to allow a function, that may fail, to be executed, and recover in a
* controlled manner.
*
* Copyright (C) 2019, Google LLC.
* Author: Brendan Higgins <brendanhiggins@google.com>
*/
#include <test/try-catch.h>
#include <test/test.h>
#include <linux/completion.h>
#include <linux/kthread.h>
static void __noreturn test_generic_throw(struct test_try_catch *try_catch)
{
try_catch->try_result = -EFAULT;
complete_and_exit(try_catch->try_completion, -EFAULT);
}
static int test_generic_run_threadfn_adapter(void *data)
{
struct test_try_catch *try_catch = data;
try_catch->try(try_catch->context);
complete_and_exit(try_catch->try_completion, 0);
}
static void test_generic_run_try_catch(struct test_try_catch *try_catch)
{
DECLARE_COMPLETION_ONSTACK(try_completion);
struct test *test = try_catch->test;
struct task_struct *task_struct;
int exit_code, status;
try_catch->try_completion = &try_completion;
try_catch->try_result = 0;
task_struct = kthread_run(test_generic_run_threadfn_adapter,
try_catch,
"test_try_catch_thread");
if (IS_ERR(task_struct)) {
try_catch->catch(try_catch->context);
return;
}
/*
* TODO(brendanhiggins@google.com): We should probably have some type of
* variable timeout here. The only question is what that timeout value
* should be.
*
* The intention has always been, at some point, to be able to label
* tests with some type of size bucket (unit/small, integration/medium,
* large/system/end-to-end, etc), where each size bucket would get a
* default timeout value kind of like what Bazel does:
* https://docs.bazel.build/versions/master/be/common-definitions.html#test.size
* There is still some debate to be had on exactly how we do this. (For
* one, we probably want to have some sort of test runner level
* timeout.)
*
* For more background on this topic, see:
* https://mike-bland.com/2011/11/01/small-medium-large.html
*/
status = wait_for_completion_timeout(&try_completion,
300 * MSEC_PER_SEC); /* 5 min */
if (status < 0) {
test_err(test, "try timed out\n");
try_catch->try_result = -ETIMEDOUT;
}
exit_code = try_catch->try_result;
if (!exit_code)
return;
if (exit_code == -EFAULT)
try_catch->try_result = 0;
else if (exit_code == -EINTR)
test_err(test, "wake_up_process() was never called\n");
else if (exit_code)
test_err(test, "Unknown error: %d\n", exit_code);
try_catch->catch(try_catch->context);
}
void test_generic_try_catch_init(struct test_try_catch *try_catch)
{
try_catch->run = test_generic_run_try_catch;
try_catch->throw = test_generic_throw;
}
void __weak test_try_catch_init_internal(struct test_try_catch *try_catch)
{
test_generic_try_catch_init(try_catch);
}