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locking/ww_mutex: Begin kselftests for ww_mutex
Signed-off-by: Chris Wilson <[email protected]> Signed-off-by: Peter Zijlstra (Intel) <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Maarten Lankhorst <[email protected]> Cc: Nicolai Hähnle <[email protected]> Cc: Paul E. McKenney <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]>
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/* | ||
* Module-based API test facility for ww_mutexes | ||
* | ||
* This program is free software; you can redistribute it and/or modify | ||
* it under the terms of the GNU General Public License as published by | ||
* the Free Software Foundation; either version 2 of the License, or | ||
* (at your option) any later version. | ||
* | ||
* This program is distributed in the hope that it will be useful, | ||
* but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
* GNU General Public License for more details. | ||
* | ||
* You should have received a copy of the GNU General Public License | ||
* along with this program; if not, you can access it online at | ||
* http://www.gnu.org/licenses/gpl-2.0.html. | ||
*/ | ||
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#include <linux/kernel.h> | ||
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#include <linux/completion.h> | ||
#include <linux/kthread.h> | ||
#include <linux/module.h> | ||
#include <linux/ww_mutex.h> | ||
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static DEFINE_WW_CLASS(ww_class); | ||
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struct test_mutex { | ||
struct work_struct work; | ||
struct ww_mutex mutex; | ||
struct completion ready, go, done; | ||
unsigned int flags; | ||
}; | ||
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#define TEST_MTX_SPIN BIT(0) | ||
#define TEST_MTX_TRY BIT(1) | ||
#define TEST_MTX_CTX BIT(2) | ||
#define __TEST_MTX_LAST BIT(3) | ||
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static void test_mutex_work(struct work_struct *work) | ||
{ | ||
struct test_mutex *mtx = container_of(work, typeof(*mtx), work); | ||
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complete(&mtx->ready); | ||
wait_for_completion(&mtx->go); | ||
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if (mtx->flags & TEST_MTX_TRY) { | ||
while (!ww_mutex_trylock(&mtx->mutex)) | ||
cpu_relax(); | ||
} else { | ||
ww_mutex_lock(&mtx->mutex, NULL); | ||
} | ||
complete(&mtx->done); | ||
ww_mutex_unlock(&mtx->mutex); | ||
} | ||
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static int __test_mutex(unsigned int flags) | ||
{ | ||
#define TIMEOUT (HZ / 16) | ||
struct test_mutex mtx; | ||
struct ww_acquire_ctx ctx; | ||
int ret; | ||
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ww_mutex_init(&mtx.mutex, &ww_class); | ||
ww_acquire_init(&ctx, &ww_class); | ||
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INIT_WORK_ONSTACK(&mtx.work, test_mutex_work); | ||
init_completion(&mtx.ready); | ||
init_completion(&mtx.go); | ||
init_completion(&mtx.done); | ||
mtx.flags = flags; | ||
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schedule_work(&mtx.work); | ||
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wait_for_completion(&mtx.ready); | ||
ww_mutex_lock(&mtx.mutex, (flags & TEST_MTX_CTX) ? &ctx : NULL); | ||
complete(&mtx.go); | ||
if (flags & TEST_MTX_SPIN) { | ||
unsigned long timeout = jiffies + TIMEOUT; | ||
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ret = 0; | ||
do { | ||
if (completion_done(&mtx.done)) { | ||
ret = -EINVAL; | ||
break; | ||
} | ||
cpu_relax(); | ||
} while (time_before(jiffies, timeout)); | ||
} else { | ||
ret = wait_for_completion_timeout(&mtx.done, TIMEOUT); | ||
} | ||
ww_mutex_unlock(&mtx.mutex); | ||
ww_acquire_fini(&ctx); | ||
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if (ret) { | ||
pr_err("%s(flags=%x): mutual exclusion failure\n", | ||
__func__, flags); | ||
ret = -EINVAL; | ||
} | ||
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flush_work(&mtx.work); | ||
destroy_work_on_stack(&mtx.work); | ||
return ret; | ||
#undef TIMEOUT | ||
} | ||
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static int test_mutex(void) | ||
{ | ||
int ret; | ||
int i; | ||
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for (i = 0; i < __TEST_MTX_LAST; i++) { | ||
ret = __test_mutex(i); | ||
if (ret) | ||
return ret; | ||
} | ||
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return 0; | ||
} | ||
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static int __init test_ww_mutex_init(void) | ||
{ | ||
int ret; | ||
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ret = test_mutex(); | ||
if (ret) | ||
return ret; | ||
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return 0; | ||
} | ||
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static void __exit test_ww_mutex_exit(void) | ||
{ | ||
} | ||
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module_init(test_ww_mutex_init); | ||
module_exit(test_ww_mutex_exit); | ||
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MODULE_LICENSE("GPL"); | ||
MODULE_AUTHOR("Intel Corporation"); |
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