diff options
Diffstat (limited to 'arch/ppc/lib/locks.c')
| -rw-r--r-- | arch/ppc/lib/locks.c | 189 |
1 files changed, 0 insertions, 189 deletions
diff --git a/arch/ppc/lib/locks.c b/arch/ppc/lib/locks.c deleted file mode 100644 index ea4aee6b20e..00000000000 --- a/arch/ppc/lib/locks.c +++ /dev/null @@ -1,189 +0,0 @@ -/* - * Locks for smp ppc - * - * Written by Cort Dougan (cort@cs.nmt.edu) - */ - -#include <linux/sched.h> -#include <linux/spinlock.h> -#include <linux/module.h> -#include <asm/ppc_asm.h> -#include <asm/smp.h> - -#ifdef CONFIG_DEBUG_SPINLOCK - -#undef INIT_STUCK -#define INIT_STUCK 200000000 /*0xffffffff*/ - -/* - * Try to acquire a spinlock. - * Only does the stwcx. if the load returned 0 - the Programming - * Environments Manual suggests not doing unnecessary stcwx.'s - * since they may inhibit forward progress by other CPUs in getting - * a lock. - */ -static inline unsigned long __spin_trylock(volatile unsigned long *lock) -{ - unsigned long ret; - - __asm__ __volatile__ ("\n\ -1: lwarx %0,0,%1\n\ - cmpwi 0,%0,0\n\ - bne 2f\n" - PPC405_ERR77(0,%1) -" stwcx. %2,0,%1\n\ - bne- 1b\n\ - isync\n\ -2:" - : "=&r"(ret) - : "r"(lock), "r"(1) - : "cr0", "memory"); - - return ret; -} - -void _raw_spin_lock(spinlock_t *lock) -{ - int cpu = smp_processor_id(); - unsigned int stuck = INIT_STUCK; - while (__spin_trylock(&lock->lock)) { - while ((unsigned volatile long)lock->lock != 0) { - if (!--stuck) { - printk("_spin_lock(%p) CPU#%d NIP %p" - " holder: cpu %ld pc %08lX\n", - lock, cpu, __builtin_return_address(0), - lock->owner_cpu,lock->owner_pc); - stuck = INIT_STUCK; - /* steal the lock */ - /*xchg_u32((void *)&lock->lock,0);*/ - } - } - } - lock->owner_pc = (unsigned long)__builtin_return_address(0); - lock->owner_cpu = cpu; -} -EXPORT_SYMBOL(_raw_spin_lock); - -int _raw_spin_trylock(spinlock_t *lock) -{ - if (__spin_trylock(&lock->lock)) - return 0; - lock->owner_cpu = smp_processor_id(); - lock->owner_pc = (unsigned long)__builtin_return_address(0); - return 1; -} -EXPORT_SYMBOL(_raw_spin_trylock); - -void _raw_spin_unlock(spinlock_t *lp) -{ - if ( !lp->lock ) - printk("_spin_unlock(%p): no lock cpu %d curr PC %p %s/%d\n", - lp, smp_processor_id(), __builtin_return_address(0), - current->comm, current->pid); - if ( lp->owner_cpu != smp_processor_id() ) - printk("_spin_unlock(%p): cpu %d trying clear of cpu %d pc %lx val %lx\n", - lp, smp_processor_id(), (int)lp->owner_cpu, - lp->owner_pc,lp->lock); - lp->owner_pc = lp->owner_cpu = 0; - wmb(); - lp->lock = 0; -} -EXPORT_SYMBOL(_raw_spin_unlock); - -/* - * For rwlocks, zero is unlocked, -1 is write-locked, - * positive is read-locked. - */ -static __inline__ int __read_trylock(rwlock_t *rw) -{ - signed int tmp; - - __asm__ __volatile__( -"2: lwarx %0,0,%1 # __read_trylock\n\ - addic. %0,%0,1\n\ - ble- 1f\n" - PPC405_ERR77(0,%1) -" stwcx. %0,0,%1\n\ - bne- 2b\n\ - isync\n\ -1:" - : "=&r"(tmp) - : "r"(&rw->lock) - : "cr0", "memory"); - - return tmp; -} - -int _raw_read_trylock(rwlock_t *rw) -{ - return __read_trylock(rw) > 0; -} -EXPORT_SYMBOL(_raw_read_trylock); - -void _raw_read_lock(rwlock_t *rw) -{ - unsigned int stuck; - - while (__read_trylock(rw) <= 0) { - stuck = INIT_STUCK; - while (!read_can_lock(rw)) { - if (--stuck == 0) { - printk("_read_lock(%p) CPU#%d lock %d\n", - rw, raw_smp_processor_id(), rw->lock); - stuck = INIT_STUCK; - } - } - } -} -EXPORT_SYMBOL(_raw_read_lock); - -void _raw_read_unlock(rwlock_t *rw) -{ - if ( rw->lock == 0 ) - printk("_read_unlock(): %s/%d (nip %08lX) lock %d\n", - current->comm,current->pid,current->thread.regs->nip, - rw->lock); - wmb(); - atomic_dec((atomic_t *) &(rw)->lock); -} -EXPORT_SYMBOL(_raw_read_unlock); - -void _raw_write_lock(rwlock_t *rw) -{ - unsigned int stuck; - - while (cmpxchg(&rw->lock, 0, -1) != 0) { - stuck = INIT_STUCK; - while (!write_can_lock(rw)) { - if (--stuck == 0) { - printk("write_lock(%p) CPU#%d lock %d)\n", - rw, raw_smp_processor_id(), rw->lock); - stuck = INIT_STUCK; - } - } - } - wmb(); -} -EXPORT_SYMBOL(_raw_write_lock); - -int _raw_write_trylock(rwlock_t *rw) -{ - if (cmpxchg(&rw->lock, 0, -1) != 0) - return 0; - wmb(); - return 1; -} -EXPORT_SYMBOL(_raw_write_trylock); - -void _raw_write_unlock(rwlock_t *rw) -{ - if (rw->lock >= 0) - printk("_write_lock(): %s/%d (nip %08lX) lock %d\n", - current->comm,current->pid,current->thread.regs->nip, - rw->lock); - wmb(); - rw->lock = 0; -} -EXPORT_SYMBOL(_raw_write_unlock); - -#endif |