1 /*
2 * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
3 * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without modification,
6 * are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this list of
9 * conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
12 * of conditions and the following disclaimer in the documentation and/or other materials
13 * provided with the distribution.
14 *
15 * 3. Neither the name of the copyright holder nor the names of its contributors may be used
16 * to endorse or promote products derived from this software without specific prior written
17 * permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
26 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
28 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
29 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include "los_spinlock.h"
33 #ifdef LOSCFG_KERNEL_SMP
34 #include "los_sched_pri.h"
35
36
LOS_SpinInit(SPIN_LOCK_S * lock)37 VOID LOS_SpinInit(SPIN_LOCK_S *lock)
38 {
39 lock->rawLock = 0;
40 lock->cpuid = (UINT32)-1;
41 lock->owner = SPINLOCK_OWNER_INIT;
42 lock->name = "spinlock";
43 }
44
LOS_SpinHeld(const SPIN_LOCK_S * lock)45 BOOL LOS_SpinHeld(const SPIN_LOCK_S *lock)
46 {
47 return (lock->rawLock != 0);
48 }
49
LOS_SpinLock(SPIN_LOCK_S * lock)50 VOID LOS_SpinLock(SPIN_LOCK_S *lock)
51 {
52 UINT32 intSave = LOS_IntLock();
53 OsSchedLock();
54 LOS_IntRestore(intSave);
55
56 LOCKDEP_CHECK_IN(lock);
57 ArchSpinLock(&lock->rawLock);
58 LOCKDEP_RECORD(lock);
59 }
60
LOS_SpinTrylock(SPIN_LOCK_S * lock)61 INT32 LOS_SpinTrylock(SPIN_LOCK_S *lock)
62 {
63 UINT32 intSave = LOS_IntLock();
64 OsSchedLock();
65 LOS_IntRestore(intSave);
66
67 INT32 ret = ArchSpinTrylock(&lock->rawLock);
68 if (ret == LOS_OK) {
69 LOCKDEP_CHECK_IN(lock);
70 LOCKDEP_RECORD(lock);
71 return ret;
72 }
73
74 intSave = LOS_IntLock();
75 BOOL needSched = OsSchedUnlockResch();
76 LOS_IntRestore(intSave);
77 if (needSched) {
78 LOS_Schedule();
79 }
80
81 return ret;
82 }
83
LOS_SpinUnlock(SPIN_LOCK_S * lock)84 VOID LOS_SpinUnlock(SPIN_LOCK_S *lock)
85 {
86 UINT32 intSave;
87 LOCKDEP_CHECK_OUT(lock);
88 ArchSpinUnlock(&lock->rawLock);
89
90 intSave = LOS_IntLock();
91 BOOL needSched = OsSchedUnlockResch();
92 LOS_IntRestore(intSave);
93 if (needSched) {
94 LOS_Schedule();
95 }
96 }
97
LOS_SpinLockSave(SPIN_LOCK_S * lock,UINT32 * intSave)98 VOID LOS_SpinLockSave(SPIN_LOCK_S *lock, UINT32 *intSave)
99 {
100 *intSave = LOS_IntLock();
101 OsSchedLock();
102
103 LOCKDEP_CHECK_IN(lock);
104 ArchSpinLock(&lock->rawLock);
105 LOCKDEP_RECORD(lock);
106 }
107
LOS_SpinUnlockRestore(SPIN_LOCK_S * lock,UINT32 intSave)108 VOID LOS_SpinUnlockRestore(SPIN_LOCK_S *lock, UINT32 intSave)
109 {
110 LOCKDEP_CHECK_OUT(lock);
111 ArchSpinUnlock(&lock->rawLock);
112
113 BOOL needSched = OsSchedUnlockResch();
114 LOS_IntRestore(intSave);
115 if (needSched) {
116 LOS_Schedule();
117 }
118 }
119 #endif
120
121