/* * Copyright 2005, Red Hat, Inc., Ingo Molnar * Released under the General Public License (GPL). * * This file contains the spinlock/rwlock implementations for * DEBUG_SPINLOCK. */ #include <linux/config.h> #include <linux/spinlock.h> #include <linux/interrupt.h> #include <linux/delay.h> static void spin_bug(spinlock_t *lock, const char *msg) { static long print_once = 1; struct task_struct *owner = NULL; if (xchg(&print_once, 0)) { if (lock->owner && lock->owner != SPINLOCK_OWNER_INIT) owner = lock->owner; printk("BUG: spinlock %s on CPU#%d, %s/%d\n", msg, smp_processor_id(), current->comm, current->pid); printk(" lock: %p, .magic: %08x, .owner: %s/%d, .owner_cpu: %d\n", lock, lock->magic, owner ? owner->comm : "<none>", owner ? owner->pid : -1, lock->owner_cpu); dump_stack(); #ifdef CONFIG_SMP /* * We cannot continue on SMP: */ // panic("bad locking"); #endif } } #define SPIN_BUG_ON(cond, lock, msg) if (unlikely(cond)) spin_bug(lock, msg) static inline void debug_spin_lock_before(spinlock_t *lock) { SPIN_BUG_ON(lock->magic != SPINLOCK_MAGIC, lock, "bad magic"); SPIN_BUG_ON(lock->owner == current, lock, "recursion"); SPIN_BUG_ON(lock->owner_cpu == raw_smp_processor_id(), lock, "cpu recursion"); } static inline void debug_spin_lock_after(spinlock_t *lock) { lock->owner_cpu = raw_smp_processor_id(); lock->owner = current; } static inline void debug_spin_unlock(spinlock_t *lock) { SPIN_BUG_ON(lock->magic != SPINLOCK_MAGIC, lock, "bad magic"); SPIN_BUG_ON(!spin_is_locked(lock), lock, "already unlocked"); SPIN_BUG_ON(lock->owner != current, lock, "wrong owner"); SPIN_BUG_ON(lock->owner_cpu != raw_smp_processor_id(), lock, "wrong CPU"); lock->owner = SPINLOCK_OWNER_INIT; lock->owner_cpu = -1; } static void __spin_lock_debug(spinlock_t *lock) { int print_once = 1; u64 i; for (;;) { for (i = 0; i < loops_per_jiffy * HZ; i++) { cpu_relax(); if (__raw_spin_trylock(&lock->raw_lock)) return; } /* lockup suspected: */ if (print_once) { print_once = 0; printk("BUG: spinlock lockup on CPU#%d, %s/%d, %p\n", smp_processor_id(), current->comm, current->pid, lock); dump_stack(); } } } void _raw_spin_lock(spinlock_t *lock) { debug_spin_lock_before(lock); if (unlikely(!__raw_spin_trylock(&lock->raw_lock))) __spin_lock_debug(lock); debug_spin_lock_after(lock); } int _raw_spin_trylock(spinlock_t *lock) { int ret = __raw_spin_trylock(&lock->raw_lock); if (ret) debug_spin_lock_after(lock); #ifndef CONFIG_SMP /* * Must not happen on UP: */ SPIN_BUG_ON(!ret, lock, "trylock failure on UP"); #endif return ret; } void _raw_spin_unlock(spinlock_t *lock) { debug_spin_unlock(lock); __raw_spin_unlock(&lock->raw_lock); } static void rwlock_bug(rwlock_t *lock, const char *msg) { static long print_once = 1; if (xchg(&print_once, 0)) { printk("BUG: rwlock %s on CPU#%d, %s/%d, %p\n", msg, smp_processor_id(), current->comm, current->pid, lock); dump_stack(); #ifdef CONFIG_SMP /* * We cannot continue on SMP: */ panic("bad locking"); #endif } } #define RWLOCK_BUG_ON(cond, lock, msg) if (unlikely(cond)) rwlock_bug(lock, msg) static void __read_lock_debug(rwlock_t *lock) { int print_once = 1; u64 i; for (;;) { for (i = 0; i < loops_per_jiffy * HZ; i++) { cpu_relax(); if (__raw_read_trylock(&lock->raw_lock)) return; } /* lockup suspected: */ if (print_once) { print_once = 0; printk("BUG: read-lock lockup on CPU#%d, %s/%d, %p\n", smp_processor_id(), current->comm, current->pid, lock); dump_stack(); } } } void _raw_read_lock(rwlock_t *lock) { RWLOCK_BUG_ON(lock->magic != RWLOCK_MAGIC, lock, "bad magic"); if (unlikely(!__raw_read_trylock(&lock->raw_lock))) __read_lock_debug(lock); } int _raw_read_trylock(rwlock_t *lock) { int ret = __raw_read_trylock(&lock->raw_lock); #ifndef CONFIG_SMP /* * Must not happen on UP: */ RWLOCK_BUG_ON(!ret, lock, "trylock failure on UP"); #endif return ret; } void _raw_read_unlock(rwlock_t *lock) { RWLOCK_BUG_ON(lock->magic != RWLOCK_MAGIC, lock, "bad magic"); __raw_read_unlock(&lock->raw_lock); } static inline void debug_write_lock_before(rwlock_t *lock) { RWLOCK_BUG_ON(lock->magic != RWLOCK_MAGIC, lock, "bad magic"); RWLOCK_BUG_ON(lock->owner == current, lock, "recursion"); RWLOCK_BUG_ON(lock->owner_cpu == raw_smp_processor_id(), lock, "cpu recursion"); } static inline void debug_write_lock_after(rwlock_t *lock) { lock->owner_cpu = raw_smp_processor_id(); lock->owner = current; } static inline void debug_write_unlock(rwlock_t *lock) { RWLOCK_BUG_ON(lock->magic != RWLOCK_MAGIC, lock, "bad magic"); RWLOCK_BUG_ON(lock->owner != current, lock, "wrong owner"); RWLOCK_BUG_ON(lock->owner_cpu != raw_smp_processor_id(), lock, "wrong CPU"); lock->owner = SPINLOCK_OWNER_INIT; lock->owner_cpu = -1; } static void __write_lock_debug(rwlock_t *lock) { int print_once = 1; u64 i; for (;;) { for (i = 0; i < loops_per_jiffy * HZ; i++) { cpu_relax(); if (__raw_write_trylock(&lock->raw_lock)) return; } /* lockup suspected: */ if (print_once) { print_once = 0; printk("BUG: write-lock lockup on CPU#%d, %s/%d, %p\n", smp_processor_id(), current->comm, current->pid, lock); dump_stack(); } } } void _raw_write_lock(rwlock_t *lock) { debug_write_lock_before(lock); if (unlikely(!__raw_write_trylock(&lock->raw_lock))) __write_lock_debug(lock); debug_write_lock_after(lock); } int _raw_write_trylock(rwlock_t *lock) { int ret = __raw_write_trylock(&lock->raw_lock); if (ret) debug_write_lock_after(lock); #ifndef CONFIG_SMP /* * Must not happen on UP: */ RWLOCK_BUG_ON(!ret, lock, "trylock failure on UP"); #endif return ret; } void _raw_write_unlock(rwlock_t *lock) { debug_write_unlock(lock); __raw_write_unlock(&lock->raw_lock); }