1 /*****************************************************************************\
2 * Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
3 * Copyright (C) 2007 The Regents of the University of California.
4 * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
5 * Written by Brian Behlendorf <behlendorf1@llnl.gov>.
8 * This file is part of the SPL, Solaris Porting Layer.
9 * For details, see <http://zfsonlinux.org/>.
11 * The SPL is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by the
13 * Free Software Foundation; either version 2 of the License, or (at your
14 * option) any later version.
16 * The SPL is distributed in the hope that it will be useful, but WITHOUT
17 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
18 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
21 * You should have received a copy of the GNU General Public License along
22 * with the SPL. If not, see <http://www.gnu.org/licenses/>.
23 *****************************************************************************
24 * Solaris Porting LAyer Tests (SPLAT) Read/Writer Lock Tests.
25 \*****************************************************************************/
27 #include <sys/random.h>
28 #include <sys/rwlock.h>
29 #include <sys/taskq.h>
30 #include <linux/delay.h>
31 #include <linux/mm_compat.h>
32 #include "splat-internal.h"
34 #define SPLAT_RWLOCK_NAME "rwlock"
35 #define SPLAT_RWLOCK_DESC "Kernel RW Lock Tests"
37 #define SPLAT_RWLOCK_TEST1_ID 0x0701
38 #define SPLAT_RWLOCK_TEST1_NAME "N-rd/1-wr"
39 #define SPLAT_RWLOCK_TEST1_DESC "Multiple readers one writer"
41 #define SPLAT_RWLOCK_TEST2_ID 0x0702
42 #define SPLAT_RWLOCK_TEST2_NAME "0-rd/N-wr"
43 #define SPLAT_RWLOCK_TEST2_DESC "Multiple writers"
45 #define SPLAT_RWLOCK_TEST3_ID 0x0703
46 #define SPLAT_RWLOCK_TEST3_NAME "held"
47 #define SPLAT_RWLOCK_TEST3_DESC "RW_{LOCK|READ|WRITE}_HELD"
49 #define SPLAT_RWLOCK_TEST4_ID 0x0704
50 #define SPLAT_RWLOCK_TEST4_NAME "tryenter"
51 #define SPLAT_RWLOCK_TEST4_DESC "Tryenter"
53 #define SPLAT_RWLOCK_TEST5_ID 0x0705
54 #define SPLAT_RWLOCK_TEST5_NAME "rw_downgrade"
55 #define SPLAT_RWLOCK_TEST5_DESC "Write downgrade"
57 #define SPLAT_RWLOCK_TEST6_ID 0x0706
58 #define SPLAT_RWLOCK_TEST6_NAME "rw_tryupgrade-1"
59 #define SPLAT_RWLOCK_TEST6_DESC "rwsem->count value"
61 #define SPLAT_RWLOCK_TEST7_ID 0x0707
62 #define SPLAT_RWLOCK_TEST7_NAME "rw_tryupgrade-2"
63 #define SPLAT_RWLOCK_TEST7_DESC "Read upgrade"
65 #define SPLAT_RWLOCK_TEST_MAGIC 0x115599DDUL
66 #define SPLAT_RWLOCK_TEST_NAME "rwlock_test"
67 #define SPLAT_RWLOCK_TEST_TASKQ "rwlock_taskq"
68 #define SPLAT_RWLOCK_TEST_COUNT 8
70 #define SPLAT_RWLOCK_RELEASE_INIT 0
71 #define SPLAT_RWLOCK_RELEASE_WR 1
72 #define SPLAT_RWLOCK_RELEASE_RD 2
74 typedef struct rw_priv
{
75 unsigned long rw_magic
;
79 spl_wait_queue_head_t rw_waitq
;
88 typedef struct rw_thr
{
91 struct task_struct
*rwt_thread
;
94 void splat_init_rw_priv(rw_priv_t
*rwp
, struct file
*file
)
96 rwp
->rw_magic
= SPLAT_RWLOCK_TEST_MAGIC
;
98 rw_init(&rwp
->rw_rwlock
, SPLAT_RWLOCK_TEST_NAME
, RW_DEFAULT
, NULL
);
99 spin_lock_init(&rwp
->rw_lock
);
100 init_waitqueue_head(&rwp
->rw_waitq
);
101 rwp
->rw_completed
= 0;
104 rwp
->rw_release
= SPLAT_RWLOCK_RELEASE_INIT
;
110 splat_rwlock_wr_thr(void *arg
)
112 rw_thr_t
*rwt
= (rw_thr_t
*)arg
;
113 rw_priv_t
*rwp
= rwt
->rwt_rwp
;
116 ASSERT(rwp
->rw_magic
== SPLAT_RWLOCK_TEST_MAGIC
);
118 get_random_bytes((void *)&rnd
, 1);
119 msleep((unsigned int)rnd
);
121 splat_vprint(rwp
->rw_file
, rwt
->rwt_name
,
122 "%s trying to acquire rwlock (%d holding/%d waiting)\n",
123 rwt
->rwt_thread
->comm
, rwp
->rw_holders
, rwp
->rw_waiters
);
124 spin_lock(&rwp
->rw_lock
);
126 spin_unlock(&rwp
->rw_lock
);
127 rw_enter(&rwp
->rw_rwlock
, RW_WRITER
);
129 spin_lock(&rwp
->rw_lock
);
132 spin_unlock(&rwp
->rw_lock
);
133 splat_vprint(rwp
->rw_file
, rwt
->rwt_name
,
134 "%s acquired rwlock (%d holding/%d waiting)\n",
135 rwt
->rwt_thread
->comm
, rwp
->rw_holders
, rwp
->rw_waiters
);
137 /* Wait for control thread to signal we can release the write lock */
138 wait_event_interruptible(rwp
->rw_waitq
, splat_locked_test(&rwp
->rw_lock
,
139 rwp
->rw_release
== SPLAT_RWLOCK_RELEASE_WR
));
141 spin_lock(&rwp
->rw_lock
);
144 spin_unlock(&rwp
->rw_lock
);
145 splat_vprint(rwp
->rw_file
, rwt
->rwt_name
,
146 "%s dropped rwlock (%d holding/%d waiting)\n",
147 rwt
->rwt_thread
->comm
, rwp
->rw_holders
, rwp
->rw_waiters
);
149 rw_exit(&rwp
->rw_rwlock
);
155 splat_rwlock_rd_thr(void *arg
)
157 rw_thr_t
*rwt
= (rw_thr_t
*)arg
;
158 rw_priv_t
*rwp
= rwt
->rwt_rwp
;
161 ASSERT(rwp
->rw_magic
== SPLAT_RWLOCK_TEST_MAGIC
);
163 get_random_bytes((void *)&rnd
, 1);
164 msleep((unsigned int)rnd
);
166 /* Don't try and take the semaphore until after someone has it */
167 wait_event_interruptible(rwp
->rw_waitq
,
168 splat_locked_test(&rwp
->rw_lock
, rwp
->rw_holders
> 0));
170 splat_vprint(rwp
->rw_file
, rwt
->rwt_name
,
171 "%s trying to acquire rwlock (%d holding/%d waiting)\n",
172 rwt
->rwt_thread
->comm
, rwp
->rw_holders
, rwp
->rw_waiters
);
173 spin_lock(&rwp
->rw_lock
);
175 spin_unlock(&rwp
->rw_lock
);
176 rw_enter(&rwp
->rw_rwlock
, RW_READER
);
178 spin_lock(&rwp
->rw_lock
);
181 spin_unlock(&rwp
->rw_lock
);
182 splat_vprint(rwp
->rw_file
, rwt
->rwt_name
,
183 "%s acquired rwlock (%d holding/%d waiting)\n",
184 rwt
->rwt_thread
->comm
, rwp
->rw_holders
, rwp
->rw_waiters
);
186 /* Wait for control thread to signal we can release the read lock */
187 wait_event_interruptible(rwp
->rw_waitq
, splat_locked_test(&rwp
->rw_lock
,
188 rwp
->rw_release
== SPLAT_RWLOCK_RELEASE_RD
));
190 spin_lock(&rwp
->rw_lock
);
193 spin_unlock(&rwp
->rw_lock
);
194 splat_vprint(rwp
->rw_file
, rwt
->rwt_name
,
195 "%s dropped rwlock (%d holding/%d waiting)\n",
196 rwt
->rwt_thread
->comm
, rwp
->rw_holders
, rwp
->rw_waiters
);
198 rw_exit(&rwp
->rw_rwlock
);
204 splat_rwlock_test1(struct file
*file
, void *arg
)
206 int i
, count
= 0, rc
= 0;
207 rw_thr_t rwt
[SPLAT_RWLOCK_TEST_COUNT
];
210 rwp
= (rw_priv_t
*)kmalloc(sizeof(*rwp
), GFP_KERNEL
);
214 splat_init_rw_priv(rwp
, file
);
216 /* Create some threads, the exact number isn't important just as
217 * long as we know how many we managed to create and should expect. */
218 for (i
= 0; i
< SPLAT_RWLOCK_TEST_COUNT
; i
++) {
219 rwt
[i
].rwt_rwp
= rwp
;
220 rwt
[i
].rwt_name
= SPLAT_RWLOCK_TEST1_NAME
;
222 /* The first thread will be the writer */
224 rwt
[i
].rwt_thread
= spl_kthread_create(splat_rwlock_wr_thr
,
225 &rwt
[i
], "%s/%d", SPLAT_RWLOCK_TEST_NAME
, i
);
227 rwt
[i
].rwt_thread
= spl_kthread_create(splat_rwlock_rd_thr
,
228 &rwt
[i
], "%s/%d", SPLAT_RWLOCK_TEST_NAME
, i
);
230 if (!IS_ERR(rwt
[i
].rwt_thread
)) {
231 wake_up_process(rwt
[i
].rwt_thread
);
236 /* Wait for the writer */
237 while (splat_locked_test(&rwp
->rw_lock
, rwp
->rw_holders
== 0)) {
238 wake_up_interruptible(&rwp
->rw_waitq
);
242 /* Wait for 'count-1' readers */
243 while (splat_locked_test(&rwp
->rw_lock
, rwp
->rw_waiters
< count
- 1)) {
244 wake_up_interruptible(&rwp
->rw_waitq
);
248 /* Verify there is only one lock holder */
249 if (splat_locked_test(&rwp
->rw_lock
, rwp
->rw_holders
) != 1) {
250 splat_vprint(file
, SPLAT_RWLOCK_TEST1_NAME
, "Only 1 holder "
251 "expected for rwlock (%d holding/%d waiting)\n",
252 rwp
->rw_holders
, rwp
->rw_waiters
);
256 /* Verify 'count-1' readers */
257 if (splat_locked_test(&rwp
->rw_lock
, rwp
->rw_waiters
!= count
- 1)) {
258 splat_vprint(file
, SPLAT_RWLOCK_TEST1_NAME
, "Only %d waiters "
259 "expected for rwlock (%d holding/%d waiting)\n",
260 count
- 1, rwp
->rw_holders
, rwp
->rw_waiters
);
264 /* Signal the writer to release, allows readers to acquire */
265 spin_lock(&rwp
->rw_lock
);
266 rwp
->rw_release
= SPLAT_RWLOCK_RELEASE_WR
;
267 wake_up_interruptible(&rwp
->rw_waitq
);
268 spin_unlock(&rwp
->rw_lock
);
270 /* Wait for 'count-1' readers to hold the lock */
271 while (splat_locked_test(&rwp
->rw_lock
, rwp
->rw_holders
< count
- 1)) {
272 wake_up_interruptible(&rwp
->rw_waitq
);
276 /* Verify there are 'count-1' readers */
277 if (splat_locked_test(&rwp
->rw_lock
, rwp
->rw_holders
!= count
- 1)) {
278 splat_vprint(file
, SPLAT_RWLOCK_TEST1_NAME
, "Only %d holders "
279 "expected for rwlock (%d holding/%d waiting)\n",
280 count
- 1, rwp
->rw_holders
, rwp
->rw_waiters
);
284 /* Release 'count-1' readers */
285 spin_lock(&rwp
->rw_lock
);
286 rwp
->rw_release
= SPLAT_RWLOCK_RELEASE_RD
;
287 wake_up_interruptible(&rwp
->rw_waitq
);
288 spin_unlock(&rwp
->rw_lock
);
290 /* Wait for the test to complete */
291 while (splat_locked_test(&rwp
->rw_lock
,
292 rwp
->rw_holders
>0 || rwp
->rw_waiters
>0))
295 rw_destroy(&(rwp
->rw_rwlock
));
302 splat_rwlock_test2_func(void *arg
)
304 rw_priv_t
*rwp
= (rw_priv_t
*)arg
;
306 ASSERT(rwp
->rw_magic
== SPLAT_RWLOCK_TEST_MAGIC
);
308 /* Read the value before sleeping and write it after we wake up to
309 * maximize the chance of a race if rwlocks are not working properly */
310 rw_enter(&rwp
->rw_rwlock
, RW_WRITER
);
312 set_current_state(TASK_INTERRUPTIBLE
);
313 schedule_timeout(HZ
/ 100); /* 1/100 of a second */
314 VERIFY(rwp
->rw_rc
== rc
);
316 rw_exit(&rwp
->rw_rwlock
);
320 splat_rwlock_test2(struct file
*file
, void *arg
)
324 int i
, rc
= 0, tq_count
= 256;
326 rwp
= (rw_priv_t
*)kmalloc(sizeof(*rwp
), GFP_KERNEL
);
330 splat_init_rw_priv(rwp
, file
);
332 /* Create several threads allowing tasks to race with each other */
333 tq
= taskq_create(SPLAT_RWLOCK_TEST_TASKQ
, num_online_cpus(),
334 defclsyspri
, 50, INT_MAX
, TASKQ_PREPOPULATE
);
341 * Schedule N work items to the work queue each of which enters the
342 * writer rwlock, sleeps briefly, then exits the writer rwlock. On a
343 * multiprocessor box these work items will be handled by all available
344 * CPUs. The task function checks to ensure the tracked shared variable
345 * is always only incremented by one. Additionally, the rwlock itself
346 * is instrumented such that if any two processors are in the
347 * critical region at the same time the system will panic. If the
348 * rwlock is implemented right this will never happy, that's a pass.
350 for (i
= 0; i
< tq_count
; i
++) {
351 if (!taskq_dispatch(tq
,splat_rwlock_test2_func
,rwp
,TQ_SLEEP
)) {
352 splat_vprint(file
, SPLAT_RWLOCK_TEST2_NAME
,
353 "Failed to queue task %d\n", i
);
360 if (rwp
->rw_rc
== tq_count
) {
361 splat_vprint(file
, SPLAT_RWLOCK_TEST2_NAME
, "%d racing threads "
362 "correctly entered/exited the rwlock %d times\n",
363 num_online_cpus(), rwp
->rw_rc
);
365 splat_vprint(file
, SPLAT_RWLOCK_TEST2_NAME
, "%d racing threads "
366 "only processed %d/%d w rwlock work items\n",
367 num_online_cpus(), rwp
->rw_rc
, tq_count
);
372 rw_destroy(&(rwp
->rw_rwlock
));
378 #define splat_rwlock_test3_helper(rwp,rex1,rex2,wex1,wex2,held_func,rc) \
380 int result, _rc1_, _rc2_, _rc3_, _rc4_; \
383 rw_enter(&(rwp)->rw_rwlock, RW_READER); \
384 _rc1_ = ((result = held_func(&(rwp)->rw_rwlock)) != rex1); \
385 splat_vprint(file, SPLAT_RWLOCK_TEST3_NAME, "%s" #held_func \
386 " returned %d (expected %d) when RW_READER\n", \
387 _rc1_ ? "Fail " : "", result, rex1); \
388 rw_exit(&(rwp)->rw_rwlock); \
389 _rc2_ = ((result = held_func(&(rwp)->rw_rwlock)) != rex2); \
390 splat_vprint(file, SPLAT_RWLOCK_TEST3_NAME, "%s" #held_func \
391 " returned %d (expected %d) when !RW_READER\n", \
392 _rc2_ ? "Fail " : "", result, rex2); \
394 rw_enter(&(rwp)->rw_rwlock, RW_WRITER); \
395 _rc3_ = ((result = held_func(&(rwp)->rw_rwlock)) != wex1); \
396 splat_vprint(file, SPLAT_RWLOCK_TEST3_NAME, "%s" #held_func \
397 " returned %d (expected %d) when RW_WRITER\n", \
398 _rc3_ ? "Fail " : "", result, wex1); \
399 rw_exit(&(rwp)->rw_rwlock); \
400 _rc4_ = ((result = held_func(&(rwp)->rw_rwlock)) != wex2); \
401 splat_vprint(file, SPLAT_RWLOCK_TEST3_NAME, "%s" #held_func \
402 " returned %d (expected %d) when !RW_WRITER\n", \
403 _rc4_ ? "Fail " : "", result, wex2); \
405 rc = ((_rc1_ || _rc2_ || _rc3_ || _rc4_) ? -EINVAL : 0); \
409 splat_rwlock_test3(struct file
*file
, void *arg
)
414 rwp
= (rw_priv_t
*)kmalloc(sizeof(*rwp
), GFP_KERNEL
);
418 splat_init_rw_priv(rwp
, file
);
420 splat_rwlock_test3_helper(rwp
, 1, 0, 1, 0, RW_LOCK_HELD
, rc1
);
421 splat_rwlock_test3_helper(rwp
, 1, 0, 0, 0, RW_READ_HELD
, rc2
);
422 splat_rwlock_test3_helper(rwp
, 0, 0, 1, 0, RW_WRITE_HELD
, rc3
);
424 rw_destroy(&rwp
->rw_rwlock
);
427 return ((rc1
|| rc2
|| rc3
) ? -EINVAL
: 0);
431 splat_rwlock_test4_func(void *arg
)
433 rw_priv_t
*rwp
= (rw_priv_t
*)arg
;
434 ASSERT(rwp
->rw_magic
== SPLAT_RWLOCK_TEST_MAGIC
);
436 if (rw_tryenter(&rwp
->rw_rwlock
, rwp
->rw_type
)) {
438 rw_exit(&rwp
->rw_rwlock
);
445 splat_rwlock_test4_name(krw_t type
)
448 case RW_NONE
: return "RW_NONE";
449 case RW_WRITER
: return "RW_WRITER";
450 case RW_READER
: return "RW_READER";
457 splat_rwlock_test4_type(taskq_t
*tq
, rw_priv_t
*rwp
, int expected_rc
,
458 krw_t holder_type
, krw_t try_type
)
462 /* Schedule a task function which will try and acquire the rwlock
463 * using type try_type while the rwlock is being held as holder_type.
464 * The result must match expected_rc for the test to pass */
465 rwp
->rw_rc
= -EINVAL
;
466 rwp
->rw_type
= try_type
;
468 if (holder_type
== RW_WRITER
|| holder_type
== RW_READER
)
469 rw_enter(&rwp
->rw_rwlock
, holder_type
);
471 id
= taskq_dispatch(tq
, splat_rwlock_test4_func
, rwp
, TQ_SLEEP
);
473 splat_vprint(rwp
->rw_file
, SPLAT_RWLOCK_TEST4_NAME
, "%s",
474 "taskq_dispatch() failed\n");
479 taskq_wait_id(tq
, id
);
481 if (rwp
->rw_rc
!= expected_rc
)
484 splat_vprint(rwp
->rw_file
, SPLAT_RWLOCK_TEST4_NAME
,
485 "%srw_tryenter(%s) returned %d (expected %d) when %s\n",
486 rc
? "Fail " : "", splat_rwlock_test4_name(try_type
),
487 rwp
->rw_rc
, expected_rc
,
488 splat_rwlock_test4_name(holder_type
));
490 if (holder_type
== RW_WRITER
|| holder_type
== RW_READER
)
491 rw_exit(&rwp
->rw_rwlock
);
497 splat_rwlock_test4(struct file
*file
, void *arg
)
501 int rc
= 0, rc1
, rc2
, rc3
, rc4
, rc5
, rc6
;
503 rwp
= (rw_priv_t
*)kmalloc(sizeof(*rwp
), GFP_KERNEL
);
507 tq
= taskq_create(SPLAT_RWLOCK_TEST_TASKQ
, 1, defclsyspri
,
508 50, INT_MAX
, TASKQ_PREPOPULATE
);
514 splat_init_rw_priv(rwp
, file
);
516 /* Validate all combinations of rw_tryenter() contention */
517 rc1
= splat_rwlock_test4_type(tq
, rwp
, -EBUSY
, RW_WRITER
, RW_WRITER
);
518 rc2
= splat_rwlock_test4_type(tq
, rwp
, -EBUSY
, RW_WRITER
, RW_READER
);
519 rc3
= splat_rwlock_test4_type(tq
, rwp
, -EBUSY
, RW_READER
, RW_WRITER
);
520 rc4
= splat_rwlock_test4_type(tq
, rwp
, 0, RW_READER
, RW_READER
);
521 rc5
= splat_rwlock_test4_type(tq
, rwp
, 0, RW_NONE
, RW_WRITER
);
522 rc6
= splat_rwlock_test4_type(tq
, rwp
, 0, RW_NONE
, RW_READER
);
524 if (rc1
|| rc2
|| rc3
|| rc4
|| rc5
|| rc6
)
529 rw_destroy(&(rwp
->rw_rwlock
));
536 splat_rwlock_test5(struct file
*file
, void *arg
)
541 rwp
= (rw_priv_t
*)kmalloc(sizeof(*rwp
), GFP_KERNEL
);
545 splat_init_rw_priv(rwp
, file
);
547 rw_enter(&rwp
->rw_rwlock
, RW_WRITER
);
548 if (!RW_WRITE_HELD(&rwp
->rw_rwlock
)) {
549 splat_vprint(file
, SPLAT_RWLOCK_TEST5_NAME
,
550 "rwlock should be write lock: %d\n",
551 RW_WRITE_HELD(&rwp
->rw_rwlock
));
555 rw_downgrade(&rwp
->rw_rwlock
);
556 if (!RW_READ_HELD(&rwp
->rw_rwlock
)) {
557 splat_vprint(file
, SPLAT_RWLOCK_TEST5_NAME
,
558 "rwlock should be read lock: %d\n",
559 RW_READ_HELD(&rwp
->rw_rwlock
));
564 splat_vprint(file
, SPLAT_RWLOCK_TEST5_NAME
, "%s",
565 "rwlock properly downgraded\n");
567 rw_exit(&rwp
->rw_rwlock
);
568 rw_destroy(&rwp
->rw_rwlock
);
575 splat_rwlock_test6(struct file
*file
, void *arg
)
580 rwp
= (rw_priv_t
*)kmalloc(sizeof(*rwp
), GFP_KERNEL
);
584 splat_init_rw_priv(rwp
, file
);
586 rw_enter(&rwp
->rw_rwlock
, RW_READER
);
587 if (RWSEM_COUNT(SEM(&rwp
->rw_rwlock
)) !=
588 SPL_RWSEM_SINGLE_READER_VALUE
) {
589 splat_vprint(file
, SPLAT_RWLOCK_TEST6_NAME
,
590 "We assumed single reader rwsem->count "
591 "should be %ld, but is %ld\n",
592 (long int)SPL_RWSEM_SINGLE_READER_VALUE
,
593 (long int)RWSEM_COUNT(SEM(&rwp
->rw_rwlock
)));
597 rw_exit(&rwp
->rw_rwlock
);
599 rw_enter(&rwp
->rw_rwlock
, RW_WRITER
);
600 if (RWSEM_COUNT(SEM(&rwp
->rw_rwlock
)) !=
601 SPL_RWSEM_SINGLE_WRITER_VALUE
) {
602 splat_vprint(file
, SPLAT_RWLOCK_TEST6_NAME
,
603 "We assumed single writer rwsem->count "
604 "should be %ld, but is %ld\n",
605 (long int)SPL_RWSEM_SINGLE_WRITER_VALUE
,
606 (long int)RWSEM_COUNT(SEM(&rwp
->rw_rwlock
)));
611 splat_vprint(file
, SPLAT_RWLOCK_TEST6_NAME
, "%s",
612 "rwsem->count same as we assumed\n");
614 rw_exit(&rwp
->rw_rwlock
);
615 rw_destroy(&rwp
->rw_rwlock
);
622 splat_rwlock_test7(struct file
*file
, void *arg
)
627 rwp
= (rw_priv_t
*)kmalloc(sizeof(*rwp
), GFP_KERNEL
);
631 splat_init_rw_priv(rwp
, file
);
633 rw_enter(&rwp
->rw_rwlock
, RW_READER
);
634 if (!RW_READ_HELD(&rwp
->rw_rwlock
)) {
635 splat_vprint(file
, SPLAT_RWLOCK_TEST7_NAME
,
636 "rwlock should be read lock: %d\n",
637 RW_READ_HELD(&rwp
->rw_rwlock
));
642 /* With one reader upgrade should never fail. */
643 rc
= rw_tryupgrade(&rwp
->rw_rwlock
);
645 splat_vprint(file
, SPLAT_RWLOCK_TEST7_NAME
,
646 "rwlock failed upgrade from reader: %d\n",
647 RW_READ_HELD(&rwp
->rw_rwlock
));
652 if (RW_READ_HELD(&rwp
->rw_rwlock
) || !RW_WRITE_HELD(&rwp
->rw_rwlock
)) {
653 splat_vprint(file
, SPLAT_RWLOCK_TEST7_NAME
, "rwlock should "
654 "have 0 (not %d) reader and 1 (not %d) writer\n",
655 RW_READ_HELD(&rwp
->rw_rwlock
),
656 RW_WRITE_HELD(&rwp
->rw_rwlock
));
661 splat_vprint(file
, SPLAT_RWLOCK_TEST7_NAME
, "%s",
662 "rwlock properly upgraded\n");
664 rw_exit(&rwp
->rw_rwlock
);
665 rw_destroy(&rwp
->rw_rwlock
);
672 splat_rwlock_init(void)
674 splat_subsystem_t
*sub
;
676 sub
= kmalloc(sizeof(*sub
), GFP_KERNEL
);
680 memset(sub
, 0, sizeof(*sub
));
681 strncpy(sub
->desc
.name
, SPLAT_RWLOCK_NAME
, SPLAT_NAME_SIZE
);
682 strncpy(sub
->desc
.desc
, SPLAT_RWLOCK_DESC
, SPLAT_DESC_SIZE
);
683 INIT_LIST_HEAD(&sub
->subsystem_list
);
684 INIT_LIST_HEAD(&sub
->test_list
);
685 spin_lock_init(&sub
->test_lock
);
686 sub
->desc
.id
= SPLAT_SUBSYSTEM_RWLOCK
;
688 SPLAT_TEST_INIT(sub
, SPLAT_RWLOCK_TEST1_NAME
, SPLAT_RWLOCK_TEST1_DESC
,
689 SPLAT_RWLOCK_TEST1_ID
, splat_rwlock_test1
);
690 SPLAT_TEST_INIT(sub
, SPLAT_RWLOCK_TEST2_NAME
, SPLAT_RWLOCK_TEST2_DESC
,
691 SPLAT_RWLOCK_TEST2_ID
, splat_rwlock_test2
);
692 SPLAT_TEST_INIT(sub
, SPLAT_RWLOCK_TEST3_NAME
, SPLAT_RWLOCK_TEST3_DESC
,
693 SPLAT_RWLOCK_TEST3_ID
, splat_rwlock_test3
);
694 SPLAT_TEST_INIT(sub
, SPLAT_RWLOCK_TEST4_NAME
, SPLAT_RWLOCK_TEST4_DESC
,
695 SPLAT_RWLOCK_TEST4_ID
, splat_rwlock_test4
);
696 SPLAT_TEST_INIT(sub
, SPLAT_RWLOCK_TEST5_NAME
, SPLAT_RWLOCK_TEST5_DESC
,
697 SPLAT_RWLOCK_TEST5_ID
, splat_rwlock_test5
);
698 SPLAT_TEST_INIT(sub
, SPLAT_RWLOCK_TEST6_NAME
, SPLAT_RWLOCK_TEST6_DESC
,
699 SPLAT_RWLOCK_TEST6_ID
, splat_rwlock_test6
);
700 SPLAT_TEST_INIT(sub
, SPLAT_RWLOCK_TEST7_NAME
, SPLAT_RWLOCK_TEST7_DESC
,
701 SPLAT_RWLOCK_TEST7_ID
, splat_rwlock_test7
);
707 splat_rwlock_fini(splat_subsystem_t
*sub
)
710 SPLAT_TEST_FINI(sub
, SPLAT_RWLOCK_TEST7_ID
);
711 SPLAT_TEST_FINI(sub
, SPLAT_RWLOCK_TEST6_ID
);
712 SPLAT_TEST_FINI(sub
, SPLAT_RWLOCK_TEST5_ID
);
713 SPLAT_TEST_FINI(sub
, SPLAT_RWLOCK_TEST4_ID
);
714 SPLAT_TEST_FINI(sub
, SPLAT_RWLOCK_TEST3_ID
);
715 SPLAT_TEST_FINI(sub
, SPLAT_RWLOCK_TEST2_ID
);
716 SPLAT_TEST_FINI(sub
, SPLAT_RWLOCK_TEST1_ID
);
721 splat_rwlock_id(void) {
722 return SPLAT_SUBSYSTEM_RWLOCK
;