diff options
Diffstat (limited to 'arch/ia64/include/asm/spinlock.h')
| -rw-r--r-- | arch/ia64/include/asm/spinlock.h | 80 |
1 files changed, 63 insertions, 17 deletions
diff --git a/arch/ia64/include/asm/spinlock.h b/arch/ia64/include/asm/spinlock.h index 0a619618b2fa..13ab71576bc7 100644 --- a/arch/ia64/include/asm/spinlock.h +++ b/arch/ia64/include/asm/spinlock.h @@ -120,6 +120,38 @@ do { \ #define __raw_read_can_lock(rw) (*(volatile int *)(rw) >= 0) #define __raw_write_can_lock(rw) (*(volatile int *)(rw) == 0) +#ifdef ASM_SUPPORTED + +static __always_inline void +__raw_read_lock_flags(raw_rwlock_t *lock, unsigned long flags) +{ + __asm__ __volatile__ ( + "tbit.nz p6, p0 = %1,%2\n" + "br.few 3f\n" + "1:\n" + "fetchadd4.rel r2 = [%0], -1;;\n" + "(p6) ssm psr.i\n" + "2:\n" + "hint @pause\n" + "ld4 r2 = [%0];;\n" + "cmp4.lt p7,p0 = r2, r0\n" + "(p7) br.cond.spnt.few 2b\n" + "(p6) rsm psr.i\n" + ";;\n" + "3:\n" + "fetchadd4.acq r2 = [%0], 1;;\n" + "cmp4.lt p7,p0 = r2, r0\n" + "(p7) br.cond.spnt.few 1b\n" + : : "r"(lock), "r"(flags), "i"(IA64_PSR_I_BIT) + : "p6", "p7", "r2", "memory"); +} + +#define __raw_read_lock(lock) __raw_read_lock_flags(lock, 0) + +#else /* !ASM_SUPPORTED */ + +#define __raw_read_lock_flags(rw, flags) __raw_read_lock(rw) + #define __raw_read_lock(rw) \ do { \ raw_rwlock_t *__read_lock_ptr = (rw); \ @@ -131,6 +163,8 @@ do { \ } \ } while (0) +#endif /* !ASM_SUPPORTED */ + #define __raw_read_unlock(rw) \ do { \ raw_rwlock_t *__read_lock_ptr = (rw); \ @@ -138,20 +172,33 @@ do { \ } while (0) #ifdef ASM_SUPPORTED -#define __raw_write_lock(rw) \ -do { \ - __asm__ __volatile__ ( \ - "mov ar.ccv = r0\n" \ - "dep r29 = -1, r0, 31, 1;;\n" \ - "1:\n" \ - "ld4 r2 = [%0];;\n" \ - "cmp4.eq p0,p7 = r0,r2\n" \ - "(p7) br.cond.spnt.few 1b \n" \ - "cmpxchg4.acq r2 = [%0], r29, ar.ccv;;\n" \ - "cmp4.eq p0,p7 = r0, r2\n" \ - "(p7) br.cond.spnt.few 1b;;\n" \ - :: "r"(rw) : "ar.ccv", "p7", "r2", "r29", "memory"); \ -} while(0) + +static __always_inline void +__raw_write_lock_flags(raw_rwlock_t *lock, unsigned long flags) +{ + __asm__ __volatile__ ( + "tbit.nz p6, p0 = %1, %2\n" + "mov ar.ccv = r0\n" + "dep r29 = -1, r0, 31, 1\n" + "br.few 3f;;\n" + "1:\n" + "(p6) ssm psr.i\n" + "2:\n" + "hint @pause\n" + "ld4 r2 = [%0];;\n" + "cmp4.eq p0,p7 = r0, r2\n" + "(p7) br.cond.spnt.few 2b\n" + "(p6) rsm psr.i\n" + ";;\n" + "3:\n" + "cmpxchg4.acq r2 = [%0], r29, ar.ccv;;\n" + "cmp4.eq p0,p7 = r0, r2\n" + "(p7) br.cond.spnt.few 1b;;\n" + : : "r"(lock), "r"(flags), "i"(IA64_PSR_I_BIT) + : "ar.ccv", "p6", "p7", "r2", "r29", "memory"); +} + +#define __raw_write_lock(rw) __raw_write_lock_flags(rw, 0) #define __raw_write_trylock(rw) \ ({ \ @@ -174,6 +221,8 @@ static inline void __raw_write_unlock(raw_rwlock_t *x) #else /* !ASM_SUPPORTED */ +#define __raw_write_lock_flags(l, flags) __raw_write_lock(l) + #define __raw_write_lock(l) \ ({ \ __u64 ia64_val, ia64_set_val = ia64_dep_mi(-1, 0, 31, 1); \ @@ -213,9 +262,6 @@ static inline int __raw_read_trylock(raw_rwlock_t *x) return (u32)ia64_cmpxchg4_acq((__u32 *)(x), new.word, old.word) == old.word; } -#define __raw_read_lock_flags(lock, flags) __raw_read_lock(lock) -#define __raw_write_lock_flags(lock, flags) __raw_write_lock(lock) - #define _raw_spin_relax(lock) cpu_relax() #define _raw_read_relax(lock) cpu_relax() #define _raw_write_relax(lock) cpu_relax() |