diff options
Diffstat (limited to 'arch/alpha/include/asm/rwsem.h')
| -rw-r--r-- | arch/alpha/include/asm/rwsem.h | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/arch/alpha/include/asm/rwsem.h b/arch/alpha/include/asm/rwsem.h new file mode 100644 index 000000000..cf8fc8f9a --- /dev/null +++ b/arch/alpha/include/asm/rwsem.h @@ -0,0 +1,211 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ALPHA_RWSEM_H +#define _ALPHA_RWSEM_H + +/* + * Written by Ivan Kokshaysky <ink@jurassic.park.msu.ru>, 2001. + * Based on asm-alpha/semaphore.h and asm-i386/rwsem.h + */ + +#ifndef _LINUX_RWSEM_H +#error "please don't include asm/rwsem.h directly, use linux/rwsem.h instead" +#endif + +#ifdef __KERNEL__ + +#include <linux/compiler.h> + +#define RWSEM_UNLOCKED_VALUE 0x0000000000000000L +#define RWSEM_ACTIVE_BIAS 0x0000000000000001L +#define RWSEM_ACTIVE_MASK 0x00000000ffffffffL +#define RWSEM_WAITING_BIAS (-0x0000000100000000L) +#define RWSEM_ACTIVE_READ_BIAS RWSEM_ACTIVE_BIAS +#define RWSEM_ACTIVE_WRITE_BIAS (RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS) + +static inline int ___down_read(struct rw_semaphore *sem) +{ + long oldcount; +#ifndef CONFIG_SMP + oldcount = sem->count.counter; + sem->count.counter += RWSEM_ACTIVE_READ_BIAS; +#else + long temp; + __asm__ __volatile__( + "1: ldq_l %0,%1\n" + " addq %0,%3,%2\n" + " stq_c %2,%1\n" + " beq %2,2f\n" + " mb\n" + ".subsection 2\n" + "2: br 1b\n" + ".previous" + :"=&r" (oldcount), "=m" (sem->count), "=&r" (temp) + :"Ir" (RWSEM_ACTIVE_READ_BIAS), "m" (sem->count) : "memory"); +#endif + return (oldcount < 0); +} + +static inline void __down_read(struct rw_semaphore *sem) +{ + if (unlikely(___down_read(sem))) + rwsem_down_read_failed(sem); +} + +static inline int __down_read_killable(struct rw_semaphore *sem) +{ + if (unlikely(___down_read(sem))) + if (IS_ERR(rwsem_down_read_failed_killable(sem))) + return -EINTR; + + return 0; +} + +/* + * trylock for reading -- returns 1 if successful, 0 if contention + */ +static inline int __down_read_trylock(struct rw_semaphore *sem) +{ + long old, new, res; + + res = atomic_long_read(&sem->count); + do { + new = res + RWSEM_ACTIVE_READ_BIAS; + if (new <= 0) + break; + old = res; + res = atomic_long_cmpxchg(&sem->count, old, new); + } while (res != old); + return res >= 0 ? 1 : 0; +} + +static inline long ___down_write(struct rw_semaphore *sem) +{ + long oldcount; +#ifndef CONFIG_SMP + oldcount = sem->count.counter; + sem->count.counter += RWSEM_ACTIVE_WRITE_BIAS; +#else + long temp; + __asm__ __volatile__( + "1: ldq_l %0,%1\n" + " addq %0,%3,%2\n" + " stq_c %2,%1\n" + " beq %2,2f\n" + " mb\n" + ".subsection 2\n" + "2: br 1b\n" + ".previous" + :"=&r" (oldcount), "=m" (sem->count), "=&r" (temp) + :"Ir" (RWSEM_ACTIVE_WRITE_BIAS), "m" (sem->count) : "memory"); +#endif + return oldcount; +} + +static inline void __down_write(struct rw_semaphore *sem) +{ + if (unlikely(___down_write(sem))) + rwsem_down_write_failed(sem); +} + +static inline int __down_write_killable(struct rw_semaphore *sem) +{ + if (unlikely(___down_write(sem))) { + if (IS_ERR(rwsem_down_write_failed_killable(sem))) + return -EINTR; + } + + return 0; +} + +/* + * trylock for writing -- returns 1 if successful, 0 if contention + */ +static inline int __down_write_trylock(struct rw_semaphore *sem) +{ + long ret = atomic_long_cmpxchg(&sem->count, RWSEM_UNLOCKED_VALUE, + RWSEM_ACTIVE_WRITE_BIAS); + if (ret == RWSEM_UNLOCKED_VALUE) + return 1; + return 0; +} + +static inline void __up_read(struct rw_semaphore *sem) +{ + long oldcount; +#ifndef CONFIG_SMP + oldcount = sem->count.counter; + sem->count.counter -= RWSEM_ACTIVE_READ_BIAS; +#else + long temp; + __asm__ __volatile__( + " mb\n" + "1: ldq_l %0,%1\n" + " subq %0,%3,%2\n" + " stq_c %2,%1\n" + " beq %2,2f\n" + ".subsection 2\n" + "2: br 1b\n" + ".previous" + :"=&r" (oldcount), "=m" (sem->count), "=&r" (temp) + :"Ir" (RWSEM_ACTIVE_READ_BIAS), "m" (sem->count) : "memory"); +#endif + if (unlikely(oldcount < 0)) + if ((int)oldcount - RWSEM_ACTIVE_READ_BIAS == 0) + rwsem_wake(sem); +} + +static inline void __up_write(struct rw_semaphore *sem) +{ + long count; +#ifndef CONFIG_SMP + sem->count.counter -= RWSEM_ACTIVE_WRITE_BIAS; + count = sem->count.counter; +#else + long temp; + __asm__ __volatile__( + " mb\n" + "1: ldq_l %0,%1\n" + " subq %0,%3,%2\n" + " stq_c %2,%1\n" + " beq %2,2f\n" + " subq %0,%3,%0\n" + ".subsection 2\n" + "2: br 1b\n" + ".previous" + :"=&r" (count), "=m" (sem->count), "=&r" (temp) + :"Ir" (RWSEM_ACTIVE_WRITE_BIAS), "m" (sem->count) : "memory"); +#endif + if (unlikely(count)) + if ((int)count == 0) + rwsem_wake(sem); +} + +/* + * downgrade write lock to read lock + */ +static inline void __downgrade_write(struct rw_semaphore *sem) +{ + long oldcount; +#ifndef CONFIG_SMP + oldcount = sem->count.counter; + sem->count.counter -= RWSEM_WAITING_BIAS; +#else + long temp; + __asm__ __volatile__( + "1: ldq_l %0,%1\n" + " addq %0,%3,%2\n" + " stq_c %2,%1\n" + " beq %2,2f\n" + " mb\n" + ".subsection 2\n" + "2: br 1b\n" + ".previous" + :"=&r" (oldcount), "=m" (sem->count), "=&r" (temp) + :"Ir" (-RWSEM_WAITING_BIAS), "m" (sem->count) : "memory"); +#endif + if (unlikely(oldcount < 0)) + rwsem_downgrade_wake(sem); +} + +#endif /* __KERNEL__ */ +#endif /* _ALPHA_RWSEM_H */ |