diff options
author | Ralf Baechle <ralf@linux-mips.org> | 1999-01-04 16:03:48 +0000 |
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committer | Ralf Baechle <ralf@linux-mips.org> | 1999-01-04 16:03:48 +0000 |
commit | 78c388aed2b7184182c08428db1de6c872d815f5 (patch) | |
tree | 4b2003b1b4ceb241a17faa995da8dd1004bb8e45 /include/asm-sparc64/spinlock.h | |
parent | eb7a5bf93aaa4be1d7c6181100ab7639e74d67f7 (diff) |
Merge with Linux 2.1.131 and more MIPS goodies.
(Did I mention that CVS is buggy ...)
Diffstat (limited to 'include/asm-sparc64/spinlock.h')
-rw-r--r-- | include/asm-sparc64/spinlock.h | 107 |
1 files changed, 98 insertions, 9 deletions
diff --git a/include/asm-sparc64/spinlock.h b/include/asm-sparc64/spinlock.h index 4e2dd6b8c..5f65fc78f 100644 --- a/include/asm-sparc64/spinlock.h +++ b/include/asm-sparc64/spinlock.h @@ -10,13 +10,8 @@ #ifndef __SMP__ -#if (__GNUC__ > 2) || (__GNUC_MINOR__ >= 8) - typedef struct { } spinlock_t; - #define SPIN_LOCK_UNLOCKED { } -#else - typedef unsigned char spinlock_t; - #define SPIN_LOCK_UNLOCKED 0 -#endif +typedef unsigned char spinlock_t; +#define SPIN_LOCK_UNLOCKED 0 #define spin_lock_init(lock) do { } while(0) #define spin_lock(lock) do { } while(0) @@ -39,8 +34,8 @@ * irq-safe write-lock, but readers can get non-irqsafe * read-locks. */ -typedef struct { } rwlock_t; -#define RW_LOCK_UNLOCKED { } +typedef unsigned long rwlock_t; +#define RW_LOCK_UNLOCKED (rwlock_t) { 0 } #define read_lock(lock) do { } while(0) #define read_unlock(lock) do { } while(0) @@ -58,6 +53,11 @@ typedef struct { } rwlock_t; #else /* !(__SMP__) */ +/* To get debugging spinlocks which detect and catch + * deadlock situations, set DEBUG_SPINLOCKS in the sparc64 + * specific makefile and rebuild your kernel. + */ + /* All of these locking primitives are expected to work properly * even in an RMO memory model, which currently is what the kernel * runs in. @@ -71,10 +71,13 @@ typedef struct { } rwlock_t; * must be pre-V9 branches. */ +#ifndef SPIN_LOCK_DEBUG + typedef unsigned char spinlock_t; #define SPIN_LOCK_UNLOCKED 0 #define spin_lock_init(lock) (*((unsigned char *)(lock)) = 0) +#define spin_is_locked(lock) (*((volatile unsigned char *)(lock)) != 0) #define spin_unlock_wait(lock) \ do { membar("#LoadLoad"); \ @@ -177,8 +180,42 @@ extern __inline__ void spin_unlock_irqrestore(spinlock_t *lock, unsigned long fl : "memory"); } +#else /* !(SPIN_LOCK_DEBUG) */ + +typedef struct { + unsigned char lock; + unsigned int owner_pc, owner_cpu; +} spinlock_t; +#define SPIN_LOCK_UNLOCKED (spinlock_t) { 0, 0, NO_PROC_ID } +#define spin_lock_init(__lock) \ +do { (__lock)->lock = 0; \ + (__lock)->owner_pc = 0; \ + (__lock)->owner_cpu = NO_PROC_ID; \ +} while(0) +#define spin_is_locked(__lock) (*((volatile unsigned char *)(&((__lock)->lock))) != 0) +#define spin_unlock_wait(__lock) \ +do { \ + membar("#LoadLoad"); \ +} while(*((volatile unsigned char *)(&((__lock)->lock)))) + +extern void _do_spin_lock (spinlock_t *lock, char *str); +extern void _do_spin_unlock (spinlock_t *lock); +extern int _spin_trylock (spinlock_t *lock); + +#define spin_trylock(lp) _spin_trylock(lp) +#define spin_lock(lock) _do_spin_lock(lock, "spin_lock") +#define spin_lock_irq(lock) do { __cli(); _do_spin_lock(lock, "spin_lock_irq"); } while(0) +#define spin_lock_irqsave(lock, flags) do { __save_and_cli(flags); _do_spin_lock(lock, "spin_lock_irqsave"); } while(0) +#define spin_unlock(lock) _do_spin_unlock(lock) +#define spin_unlock_irq(lock) do { _do_spin_unlock(lock); __sti(); } while(0) +#define spin_unlock_irqrestore(lock, flags) do { _do_spin_unlock(lock); __restore_flags(flags); } while(0) + +#endif /* SPIN_LOCK_DEBUG */ + /* Multi-reader locks, these are much saner than the 32-bit Sparc ones... */ +#ifndef SPIN_LOCK_DEBUG + typedef unsigned long rwlock_t; #define RW_LOCK_UNLOCKED 0 @@ -278,6 +315,58 @@ extern __inline__ void write_unlock(rwlock_t *rw) #define write_unlock_irqrestore(lock, flags) \ do { write_unlock(lock); __restore_flags(flags); } while (0) +#else /* !(SPIN_LOCK_DEBUG) */ + +typedef struct { + unsigned long lock; + unsigned int writer_pc, writer_cpu; + unsigned int reader_pc[4]; +} rwlock_t; +#define RW_LOCK_UNLOCKED (rwlock_t) { 0, 0, NO_PROC_ID, { 0, 0, 0, 0 } } + +extern void _do_read_lock(rwlock_t *rw, char *str); +extern void _do_read_unlock(rwlock_t *rw, char *str); +extern void _do_write_lock(rwlock_t *rw, char *str); +extern void _do_write_unlock(rwlock_t *rw); + +#define read_lock(lock) \ +do { unsigned long flags; \ + __save_and_cli(flags); \ + _do_read_lock(lock, "read_lock"); \ + __restore_flags(flags); \ +} while(0) +#define read_lock_irq(lock) do { __cli(); _do_read_lock(lock, "read_lock_irq"); } while(0) +#define read_lock_irqsave(lock, flags) do { __save_and_cli(flags); _do_read_lock(lock, "read_lock_irqsave"); } while(0) + +#define read_unlock(lock) \ +do { unsigned long flags; \ + __save_and_cli(flags); \ + _do_read_unlock(lock, "read_unlock"); \ + __restore_flags(flags); \ +} while(0) +#define read_unlock_irq(lock) do { _do_read_unlock(lock, "read_unlock_irq"); __sti() } while(0) +#define read_unlock_irqrestore(lock, flags) do { _do_read_unlock(lock, "read_unlock_irqrestore"); __restore_flags(flags); } while(0) + +#define write_lock(lock) \ +do { unsigned long flags; \ + __save_and_cli(flags); \ + _do_write_lock(lock, "write_lock"); \ + __restore_flags(flags); \ +} while(0) +#define write_lock_irq(lock) do { __cli(); _do_write_lock(lock, "write_lock_irq"); } while(0) +#define write_lock_irqsave(lock, flags) do { __save_and_cli(flags); _do_write_lock(lock, "write_lock_irqsave"); } while(0) + +#define write_unlock(lock) \ +do { unsigned long flags; \ + __save_and_cli(flags); \ + _do_write_unlock(lock); \ + __restore_flags(flags); \ +} while(0) +#define write_unlock_irq(lock) do { _do_write_unlock(lock); __sti(); } while(0) +#define write_unlock_irqrestore(lock, flags) do { _do_write_unlock(lock); __restore_flags(flags); } while(0) + +#endif /* SPIN_LOCK_DEBUG */ + #endif /* __SMP__ */ #endif /* !(__ASSEMBLY__) */ |