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| 1 | /* |
1 | /* |
| 2 | * Copyright (C) 2001-2004 Jakub Jermar |
2 | * Copyright (C) 2001-2004 Jakub Jermar |
| 3 | * All rights reserved. |
3 | * All rights reserved. |
| 4 | * |
4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
7 | * are met: |
| 8 | * |
8 | * |
| 9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
| 14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
| 15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
| 16 | * |
16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | */ |
27 | */ |
| 28 | 28 | ||
| 29 | #ifndef __SPINLOCK_H__ |
29 | #ifndef __SPINLOCK_H__ |
| 30 | #define __SPINLOCK_H__ |
30 | #define __SPINLOCK_H__ |
| 31 | 31 | ||
| 32 | #include <arch/types.h> |
32 | #include <arch/types.h> |
| 33 | #include <typedefs.h> |
33 | #include <typedefs.h> |
| 34 | #include <preemption.h> |
34 | #include <preemption.h> |
| 35 | #include <arch/atomic.h> |
35 | #include <arch/atomic.h> |
| - | 36 | #include <debug.h> |
|
| 36 | 37 | ||
| 37 | #ifdef CONFIG_SMP |
38 | #ifdef CONFIG_SMP |
| 38 | struct spinlock { |
39 | struct spinlock { |
| 39 | #ifdef CONFIG_DEBUG_SPINLOCK |
40 | #ifdef CONFIG_DEBUG_SPINLOCK |
| 40 | char *name; |
41 | char *name; |
| 41 | #endif |
42 | #endif |
| 42 | atomic_t val; |
43 | atomic_t val; |
| 43 | }; |
44 | }; |
| 44 | 45 | ||
| 45 | /* |
46 | /* |
| 46 | * SPINLOCK_DECLARE is to be used for dynamically allocated spinlocks, |
47 | * SPINLOCK_DECLARE is to be used for dynamically allocated spinlocks, |
| 47 | * where the lock gets initialized in run time. |
48 | * where the lock gets initialized in run time. |
| 48 | */ |
49 | */ |
| 49 | #define SPINLOCK_DECLARE(slname) spinlock_t slname |
50 | #define SPINLOCK_DECLARE(slname) spinlock_t slname |
| 50 | 51 | ||
| 51 | /* |
52 | /* |
| 52 | * SPINLOCK_INITIALIZE is to be used for statically allocated spinlocks. |
53 | * SPINLOCK_INITIALIZE is to be used for statically allocated spinlocks. |
| 53 | * It declares and initializes the lock. |
54 | * It declares and initializes the lock. |
| 54 | */ |
55 | */ |
| 55 | #ifdef CONFIG_DEBUG_SPINLOCK |
56 | #ifdef CONFIG_DEBUG_SPINLOCK |
| 56 | #define SPINLOCK_INITIALIZE(slname) \ |
57 | #define SPINLOCK_INITIALIZE(slname) \ |
| 57 | spinlock_t slname = { \ |
58 | spinlock_t slname = { \ |
| 58 | .name = #slname, \ |
59 | .name = #slname, \ |
| 59 | .val = { 0 } \ |
60 | .val = { 0 } \ |
| 60 | } |
61 | } |
| 61 | #else |
62 | #else |
| 62 | #define SPINLOCK_INITIALIZE(slname) \ |
63 | #define SPINLOCK_INITIALIZE(slname) \ |
| 63 | spinlock_t slname = { \ |
64 | spinlock_t slname = { \ |
| 64 | .val = { 0 } \ |
65 | .val = { 0 } \ |
| 65 | } |
66 | } |
| 66 | #endif |
67 | #endif |
| 67 | 68 | ||
| 68 | extern void spinlock_initialize(spinlock_t *sl, char *name); |
69 | extern void spinlock_initialize(spinlock_t *sl, char *name); |
| 69 | extern void spinlock_lock(spinlock_t *sl); |
- | |
| 70 | extern int spinlock_trylock(spinlock_t *sl); |
70 | extern int spinlock_trylock(spinlock_t *sl); |
| 71 | extern void spinlock_unlock(spinlock_t *sl); |
71 | extern void spinlock_lock_debug(spinlock_t *sl); |
| - | 72 | ||
| - | 73 | #ifdef CONFIG_DEBUG_SPINLOCK |
|
| - | 74 | # define spinlock_lock(x) spinlock_lock_debug(x) |
|
| - | 75 | #else |
|
| - | 76 | # define spinlock_lock(x) atomic_lock_arch(&(x)->val) |
|
| - | 77 | #endif |
|
| - | 78 | ||
| - | 79 | /** Unlock spinlock |
|
| - | 80 | * |
|
| - | 81 | * Unlock spinlock. |
|
| - | 82 | * |
|
| - | 83 | * @param sl Pointer to spinlock_t structure. |
|
| - | 84 | */ |
|
| - | 85 | static inline void spinlock_unlock(spinlock_t *sl) |
|
| - | 86 | { |
|
| - | 87 | ASSERT(atomic_get(&sl->val) != 0); |
|
| - | 88 | ||
| - | 89 | /* |
|
| - | 90 | * Prevent critical section code from bleeding out this way down. |
|
| - | 91 | */ |
|
| - | 92 | CS_LEAVE_BARRIER(); |
|
| - | 93 | ||
| - | 94 | atomic_set(&sl->val,0); |
|
| - | 95 | preemption_enable(); |
|
| - | 96 | } |
|
| 72 | 97 | ||
| 73 | #else |
98 | #else |
| 74 | 99 | ||
| 75 | /* On UP systems, spinlocks are effectively left out. */ |
100 | /* On UP systems, spinlocks are effectively left out. */ |
| 76 | #define SPINLOCK_DECLARE(name) |
101 | #define SPINLOCK_DECLARE(name) |
| 77 | #define SPINLOCK_INITIALIZE(name) |
102 | #define SPINLOCK_INITIALIZE(name) |
| 78 | 103 | ||
| 79 | #define spinlock_initialize(x,name) |
104 | #define spinlock_initialize(x,name) |
| 80 | #define spinlock_lock(x) preemption_disable() |
105 | #define spinlock_lock(x) preemption_disable() |
| 81 | #define spinlock_trylock(x) (preemption_disable(), 1) |
106 | #define spinlock_trylock(x) (preemption_disable(), 1) |
| 82 | #define spinlock_unlock(x) preemption_enable() |
107 | #define spinlock_unlock(x) preemption_enable() |
| 83 | 108 | ||
| 84 | #endif |
109 | #endif |
| 85 | 110 | ||
| 86 | #endif |
111 | #endif |
| 87 | 112 | ||