99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
|
// 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 <kunit/test.h>
|
||
|
|
#include <linux/completion.h>
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/kthread.h>
|
||
|
|
|
||
|
|
#include "try-catch-impl.h"
|
||
|
|
|
||
|
|
void __noreturn kunit_try_catch_throw(struct kunit_try_catch *try_catch)
|
||
|
|
{
|
||
|
|
try_catch->try_result = -EFAULT;
|
||
|
|
kthread_complete_and_exit(try_catch->try_completion, -EFAULT);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(kunit_try_catch_throw);
|
||
|
|
|
||
|
|
static int kunit_generic_run_threadfn_adapter(void *data)
|
||
|
|
{
|
||
|
|
struct kunit_try_catch *try_catch = data;
|
||
|
|
|
||
|
|
try_catch->try(try_catch->context);
|
||
|
|
|
||
|
|
kthread_complete_and_exit(try_catch->try_completion, 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
static unsigned long kunit_test_timeout(void)
|
||
|
|
{
|
||
|
|
/*
|
||
|
|
* 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
|
||
|
|
*
|
||
|
|
* If tests timeout due to exceeding sysctl_hung_task_timeout_secs,
|
||
|
|
* the task will be killed and an oops generated.
|
||
|
|
*/
|
||
|
|
return 300 * msecs_to_jiffies(MSEC_PER_SEC); /* 5 min */
|
||
|
|
}
|
||
|
|
|
||
|
|
void kunit_try_catch_run(struct kunit_try_catch *try_catch, void *context)
|
||
|
|
{
|
||
|
|
DECLARE_COMPLETION_ONSTACK(try_completion);
|
||
|
|
struct kunit *test = try_catch->test;
|
||
|
|
struct task_struct *task_struct;
|
||
|
|
int exit_code, time_remaining;
|
||
|
|
|
||
|
|
try_catch->context = context;
|
||
|
|
try_catch->try_completion = &try_completion;
|
||
|
|
try_catch->try_result = 0;
|
||
|
|
task_struct = kthread_run(kunit_generic_run_threadfn_adapter,
|
||
|
|
try_catch,
|
||
|
|
"kunit_try_catch_thread");
|
||
|
|
if (IS_ERR(task_struct)) {
|
||
|
|
try_catch->catch(try_catch->context);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
time_remaining = wait_for_completion_timeout(&try_completion,
|
||
|
|
kunit_test_timeout());
|
||
|
|
if (time_remaining == 0) {
|
||
|
|
kunit_err(test, "try timed out\n");
|
||
|
|
try_catch->try_result = -ETIMEDOUT;
|
||
|
|
kthread_stop(task_struct);
|
||
|
|
}
|
||
|
|
|
||
|
|
exit_code = try_catch->try_result;
|
||
|
|
|
||
|
|
if (!exit_code)
|
||
|
|
return;
|
||
|
|
|
||
|
|
if (exit_code == -EFAULT)
|
||
|
|
try_catch->try_result = 0;
|
||
|
|
else if (exit_code == -EINTR)
|
||
|
|
kunit_err(test, "wake_up_process() was never called\n");
|
||
|
|
else if (exit_code)
|
||
|
|
kunit_err(test, "Unknown error: %d\n", exit_code);
|
||
|
|
|
||
|
|
try_catch->catch(try_catch->context);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(kunit_try_catch_run);
|