| 1 | #ifndef __LINUX_SPINLOCK_API_SMP_H |
| 2 | #define __LINUX_SPINLOCK_API_SMP_H |
| 3 | |
| 4 | #ifndef __LINUX_SPINLOCK_H |
| 5 | # error "please don't include this file directly" |
| 6 | #endif |
| 7 | |
| 8 | /* |
| 9 | * include/linux/spinlock_api_smp.h |
| 10 | * |
| 11 | * spinlock API declarations on SMP (and debug) |
| 12 | * (implemented in kernel/spinlock.c) |
| 13 | * |
| 14 | * portions Copyright 2005, Red Hat, Inc., Ingo Molnar |
| 15 | * Released under the General Public License (GPL). |
| 16 | */ |
| 17 | |
| 18 | int in_lock_functions(unsigned long addr); |
| 19 | |
| 20 | #define assert_raw_spin_locked(x) BUG_ON(!raw_spin_is_locked(x)) |
| 21 | |
| 22 | void __lockfunc _raw_spin_lock(raw_spinlock_t *lock) __acquires(lock); |
| 23 | void __lockfunc _raw_spin_lock_nested(raw_spinlock_t *lock, int subclass) |
| 24 | __acquires(lock); |
| 25 | void __lockfunc |
| 26 | _raw_spin_lock_nest_lock(raw_spinlock_t *lock, struct lockdep_map *map) |
| 27 | __acquires(lock); |
| 28 | void __lockfunc _raw_spin_lock_bh(raw_spinlock_t *lock) __acquires(lock); |
| 29 | void __lockfunc _raw_spin_lock_irq(raw_spinlock_t *lock) |
| 30 | __acquires(lock); |
| 31 | |
| 32 | unsigned long __lockfunc _raw_spin_lock_irqsave(raw_spinlock_t *lock) |
| 33 | __acquires(lock); |
| 34 | unsigned long __lockfunc |
| 35 | _raw_spin_lock_irqsave_nested(raw_spinlock_t *lock, int subclass) |
| 36 | __acquires(lock); |
| 37 | int __lockfunc _raw_spin_trylock(raw_spinlock_t *lock); |
| 38 | int __lockfunc _raw_spin_trylock_bh(raw_spinlock_t *lock); |
| 39 | void __lockfunc _raw_spin_unlock(raw_spinlock_t *lock) __releases(lock); |
| 40 | void __lockfunc _raw_spin_unlock_bh(raw_spinlock_t *lock) __releases(lock); |
| 41 | void __lockfunc _raw_spin_unlock_irq(raw_spinlock_t *lock) __releases(lock); |
| 42 | void __lockfunc |
| 43 | _raw_spin_unlock_irqrestore(raw_spinlock_t *lock, unsigned long flags) |
| 44 | __releases(lock); |
| 45 | |
| 46 | #ifdef CONFIG_INLINE_SPIN_LOCK |
| 47 | #define _raw_spin_lock(lock) __raw_spin_lock(lock) |
| 48 | #endif |
| 49 | |
| 50 | #ifdef CONFIG_INLINE_SPIN_LOCK_BH |
| 51 | #define _raw_spin_lock_bh(lock) __raw_spin_lock_bh(lock) |
| 52 | #endif |
| 53 | |
| 54 | #ifdef CONFIG_INLINE_SPIN_LOCK_IRQ |
| 55 | #define _raw_spin_lock_irq(lock) __raw_spin_lock_irq(lock) |
| 56 | #endif |
| 57 | |
| 58 | #ifdef CONFIG_INLINE_SPIN_LOCK_IRQSAVE |
| 59 | #define _raw_spin_lock_irqsave(lock) __raw_spin_lock_irqsave(lock) |
| 60 | #endif |
| 61 | |
| 62 | #ifdef CONFIG_INLINE_SPIN_TRYLOCK |
| 63 | #define _raw_spin_trylock(lock) __raw_spin_trylock(lock) |
| 64 | #endif |
| 65 | |
| 66 | #ifdef CONFIG_INLINE_SPIN_TRYLOCK_BH |
| 67 | #define _raw_spin_trylock_bh(lock) __raw_spin_trylock_bh(lock) |
| 68 | #endif |
| 69 | |
| 70 | #ifndef CONFIG_UNINLINE_SPIN_UNLOCK |
| 71 | #define _raw_spin_unlock(lock) __raw_spin_unlock(lock) |
| 72 | #endif |
| 73 | |
| 74 | #ifdef CONFIG_INLINE_SPIN_UNLOCK_BH |
| 75 | #define _raw_spin_unlock_bh(lock) __raw_spin_unlock_bh(lock) |
| 76 | #endif |
| 77 | |
| 78 | #ifdef CONFIG_INLINE_SPIN_UNLOCK_IRQ |
| 79 | #define _raw_spin_unlock_irq(lock) __raw_spin_unlock_irq(lock) |
| 80 | #endif |
| 81 | |
| 82 | #ifdef CONFIG_INLINE_SPIN_UNLOCK_IRQRESTORE |
| 83 | #define _raw_spin_unlock_irqrestore(lock, flags) __raw_spin_unlock_irqrestore(lock, flags) |
| 84 | #endif |
| 85 | |
| 86 | static inline int __raw_spin_trylock(raw_spinlock_t *lock) |
| 87 | { |
| 88 | preempt_disable(); |
| 89 | if (do_raw_spin_trylock(lock)) { |
| 90 | dbg_snapshot_spinlock(lock, 1); |
| 91 | spin_acquire(&lock->dep_map, 0, 1, _RET_IP_); |
| 92 | dbg_snapshot_spinlock(lock, 2); |
| 93 | return 1; |
| 94 | } |
| 95 | preempt_enable(); |
| 96 | return 0; |
| 97 | } |
| 98 | |
| 99 | /* |
| 100 | * If lockdep is enabled then we use the non-preemption spin-ops |
| 101 | * even on CONFIG_PREEMPT, because lockdep assumes that interrupts are |
| 102 | * not re-enabled during lock-acquire (which the preempt-spin-ops do): |
| 103 | */ |
| 104 | #if !defined(CONFIG_GENERIC_LOCKBREAK) || defined(CONFIG_DEBUG_LOCK_ALLOC) |
| 105 | |
| 106 | static inline unsigned long __raw_spin_lock_irqsave(raw_spinlock_t *lock) |
| 107 | { |
| 108 | unsigned long flags; |
| 109 | |
| 110 | local_irq_save(flags); |
| 111 | preempt_disable(); |
| 112 | dbg_snapshot_spinlock(lock, 1); |
| 113 | spin_acquire(&lock->dep_map, 0, 0, _RET_IP_); |
| 114 | /* |
| 115 | * On lockdep we dont want the hand-coded irq-enable of |
| 116 | * do_raw_spin_lock_flags() code, because lockdep assumes |
| 117 | * that interrupts are not re-enabled during lock-acquire: |
| 118 | */ |
| 119 | #ifdef CONFIG_LOCKDEP |
| 120 | LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock); |
| 121 | #else |
| 122 | do_raw_spin_lock_flags(lock, &flags); |
| 123 | #endif |
| 124 | dbg_snapshot_spinlock(lock, 2); |
| 125 | return flags; |
| 126 | } |
| 127 | |
| 128 | static inline void __raw_spin_lock_irq(raw_spinlock_t *lock) |
| 129 | { |
| 130 | local_irq_disable(); |
| 131 | preempt_disable(); |
| 132 | dbg_snapshot_spinlock(lock, 1); |
| 133 | spin_acquire(&lock->dep_map, 0, 0, _RET_IP_); |
| 134 | LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock); |
| 135 | dbg_snapshot_spinlock(lock, 2); |
| 136 | } |
| 137 | |
| 138 | static inline void __raw_spin_lock_bh(raw_spinlock_t *lock) |
| 139 | { |
| 140 | __local_bh_disable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET); |
| 141 | spin_acquire(&lock->dep_map, 0, 0, _RET_IP_); |
| 142 | LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock); |
| 143 | } |
| 144 | |
| 145 | static inline void __raw_spin_lock(raw_spinlock_t *lock) |
| 146 | { |
| 147 | preempt_disable(); |
| 148 | dbg_snapshot_spinlock(lock, 1); |
| 149 | spin_acquire(&lock->dep_map, 0, 0, _RET_IP_); |
| 150 | LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock); |
| 151 | dbg_snapshot_spinlock(lock, 2); |
| 152 | } |
| 153 | |
| 154 | #endif /* !CONFIG_GENERIC_LOCKBREAK || CONFIG_DEBUG_LOCK_ALLOC */ |
| 155 | |
| 156 | static inline void __raw_spin_unlock(raw_spinlock_t *lock) |
| 157 | { |
| 158 | spin_release(&lock->dep_map, 1, _RET_IP_); |
| 159 | dbg_snapshot_spinlock(lock, 3); |
| 160 | do_raw_spin_unlock(lock); |
| 161 | preempt_enable(); |
| 162 | } |
| 163 | |
| 164 | static inline void __raw_spin_unlock_irqrestore(raw_spinlock_t *lock, |
| 165 | unsigned long flags) |
| 166 | { |
| 167 | spin_release(&lock->dep_map, 1, _RET_IP_); |
| 168 | do_raw_spin_unlock(lock); |
| 169 | dbg_snapshot_spinlock(lock, 3); |
| 170 | local_irq_restore(flags); |
| 171 | preempt_enable(); |
| 172 | } |
| 173 | |
| 174 | static inline void __raw_spin_unlock_irq(raw_spinlock_t *lock) |
| 175 | { |
| 176 | spin_release(&lock->dep_map, 1, _RET_IP_); |
| 177 | do_raw_spin_unlock(lock); |
| 178 | dbg_snapshot_spinlock(lock, 3); |
| 179 | local_irq_enable(); |
| 180 | preempt_enable(); |
| 181 | } |
| 182 | |
| 183 | static inline void __raw_spin_unlock_bh(raw_spinlock_t *lock) |
| 184 | { |
| 185 | spin_release(&lock->dep_map, 1, _RET_IP_); |
| 186 | do_raw_spin_unlock(lock); |
| 187 | __local_bh_enable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET); |
| 188 | } |
| 189 | |
| 190 | static inline int __raw_spin_trylock_bh(raw_spinlock_t *lock) |
| 191 | { |
| 192 | __local_bh_disable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET); |
| 193 | if (do_raw_spin_trylock(lock)) { |
| 194 | spin_acquire(&lock->dep_map, 0, 1, _RET_IP_); |
| 195 | return 1; |
| 196 | } |
| 197 | __local_bh_enable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET); |
| 198 | return 0; |
| 199 | } |
| 200 | |
| 201 | #include <linux/rwlock_api_smp.h> |
| 202 | |
| 203 | #endif /* __LINUX_SPINLOCK_API_SMP_H */ |