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 _raw_spin_lock_bh_nested(raw_spinlock_t *lock, int subclass) 26 __acquires(lock); 27 void __lockfunc 28 _raw_spin_lock_nest_lock(raw_spinlock_t *lock, struct lockdep_map *map) 29 __acquires(lock); 30 void __lockfunc _raw_spin_lock_bh(raw_spinlock_t *lock) __acquires(lock); 31 void __lockfunc _raw_spin_lock_irq(raw_spinlock_t *lock) 32 __acquires(lock); 33 34 unsigned long __lockfunc _raw_spin_lock_irqsave(raw_spinlock_t *lock) 35 __acquires(lock); 36 unsigned long __lockfunc 37 _raw_spin_lock_irqsave_nested(raw_spinlock_t *lock, int subclass) 38 __acquires(lock); 39 int __lockfunc _raw_spin_trylock(raw_spinlock_t *lock); 40 int __lockfunc _raw_spin_trylock_bh(raw_spinlock_t *lock); 41 void __lockfunc _raw_spin_unlock(raw_spinlock_t *lock) __releases(lock); 42 void __lockfunc _raw_spin_unlock_bh(raw_spinlock_t *lock) __releases(lock); 43 void __lockfunc _raw_spin_unlock_irq(raw_spinlock_t *lock) __releases(lock); 44 void __lockfunc 45 _raw_spin_unlock_irqrestore(raw_spinlock_t *lock, unsigned long flags) 46 __releases(lock); 47 48 #ifdef CONFIG_INLINE_SPIN_LOCK 49 #define _raw_spin_lock(lock) __raw_spin_lock(lock) 50 #endif 51 52 #ifdef CONFIG_INLINE_SPIN_LOCK_BH 53 #define _raw_spin_lock_bh(lock) __raw_spin_lock_bh(lock) 54 #endif 55 56 #ifdef CONFIG_INLINE_SPIN_LOCK_IRQ 57 #define _raw_spin_lock_irq(lock) __raw_spin_lock_irq(lock) 58 #endif 59 60 #ifdef CONFIG_INLINE_SPIN_LOCK_IRQSAVE 61 #define _raw_spin_lock_irqsave(lock) __raw_spin_lock_irqsave(lock) 62 #endif 63 64 #ifdef CONFIG_INLINE_SPIN_TRYLOCK 65 #define _raw_spin_trylock(lock) __raw_spin_trylock(lock) 66 #endif 67 68 #ifdef CONFIG_INLINE_SPIN_TRYLOCK_BH 69 #define _raw_spin_trylock_bh(lock) __raw_spin_trylock_bh(lock) 70 #endif 71 72 #ifndef CONFIG_UNINLINE_SPIN_UNLOCK 73 #define _raw_spin_unlock(lock) __raw_spin_unlock(lock) 74 #endif 75 76 #ifdef CONFIG_INLINE_SPIN_UNLOCK_BH 77 #define _raw_spin_unlock_bh(lock) __raw_spin_unlock_bh(lock) 78 #endif 79 80 #ifdef CONFIG_INLINE_SPIN_UNLOCK_IRQ 81 #define _raw_spin_unlock_irq(lock) __raw_spin_unlock_irq(lock) 82 #endif 83 84 #ifdef CONFIG_INLINE_SPIN_UNLOCK_IRQRESTORE 85 #define _raw_spin_unlock_irqrestore(lock, flags) __raw_spin_unlock_irqrestore(lock, flags) 86 #endif 87 88 static inline int __raw_spin_trylock(raw_spinlock_t *lock) 89 { 90 preempt_disable(); 91 if (do_raw_spin_trylock(lock)) { 92 spin_acquire(&lock->dep_map, 0, 1, _RET_IP_); 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 spin_acquire(&lock->dep_map, 0, 0, _RET_IP_); 113 /* 114 * On lockdep we dont want the hand-coded irq-enable of 115 * do_raw_spin_lock_flags() code, because lockdep assumes 116 * that interrupts are not re-enabled during lock-acquire: 117 */ 118 #ifdef CONFIG_LOCKDEP 119 LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock); 120 #else 121 do_raw_spin_lock_flags(lock, &flags); 122 #endif 123 return flags; 124 } 125 126 static inline void __raw_spin_lock_irq(raw_spinlock_t *lock) 127 { 128 local_irq_disable(); 129 preempt_disable(); 130 spin_acquire(&lock->dep_map, 0, 0, _RET_IP_); 131 LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock); 132 } 133 134 static inline void __raw_spin_lock_bh(raw_spinlock_t *lock) 135 { 136 __local_bh_disable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET); 137 spin_acquire(&lock->dep_map, 0, 0, _RET_IP_); 138 LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock); 139 } 140 141 static inline void __raw_spin_lock(raw_spinlock_t *lock) 142 { 143 preempt_disable(); 144 spin_acquire(&lock->dep_map, 0, 0, _RET_IP_); 145 LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock); 146 } 147 148 #endif /* !CONFIG_GENERIC_LOCKBREAK || CONFIG_DEBUG_LOCK_ALLOC */ 149 150 static inline void __raw_spin_unlock(raw_spinlock_t *lock) 151 { 152 spin_release(&lock->dep_map, 1, _RET_IP_); 153 do_raw_spin_unlock(lock); 154 preempt_enable(); 155 } 156 157 static inline void __raw_spin_unlock_irqrestore(raw_spinlock_t *lock, 158 unsigned long flags) 159 { 160 spin_release(&lock->dep_map, 1, _RET_IP_); 161 do_raw_spin_unlock(lock); 162 local_irq_restore(flags); 163 preempt_enable(); 164 } 165 166 static inline void __raw_spin_unlock_irq(raw_spinlock_t *lock) 167 { 168 spin_release(&lock->dep_map, 1, _RET_IP_); 169 do_raw_spin_unlock(lock); 170 local_irq_enable(); 171 preempt_enable(); 172 } 173 174 static inline void __raw_spin_unlock_bh(raw_spinlock_t *lock) 175 { 176 spin_release(&lock->dep_map, 1, _RET_IP_); 177 do_raw_spin_unlock(lock); 178 __local_bh_enable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET); 179 } 180 181 static inline int __raw_spin_trylock_bh(raw_spinlock_t *lock) 182 { 183 __local_bh_disable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET); 184 if (do_raw_spin_trylock(lock)) { 185 spin_acquire(&lock->dep_map, 0, 1, _RET_IP_); 186 return 1; 187 } 188 __local_bh_enable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET); 189 return 0; 190 } 191 192 #include <linux/rwlock_api_smp.h> 193 194 #endif /* __LINUX_SPINLOCK_API_SMP_H */ 195