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#ifndef _LINUX_LOCALLOCK_H
#define _LINUX_LOCALLOCK_H
#include <linux/percpu.h>
#include <linux/spinlock.h>
#ifdef CONFIG_PREEMPT_RT_BASE
#ifdef CONFIG_DEBUG_SPINLOCK
# define LL_WARN(cond) WARN_ON(cond)
#else
# define LL_WARN(cond) do { } while (0)
#endif
/*
* per cpu lock based substitute for local_irq_*()
*/
struct local_irq_lock {
spinlock_t lock;
struct task_struct *owner;
int nestcnt;
unsigned long flags;
};
#define DEFINE_LOCAL_IRQ_LOCK(lvar) \
DEFINE_PER_CPU(struct local_irq_lock, lvar) = { \
.lock = __SPIN_LOCK_UNLOCKED((lvar).lock) }
#define DECLARE_LOCAL_IRQ_LOCK(lvar) \
DECLARE_PER_CPU(struct local_irq_lock, lvar)
#define local_irq_lock_init(lvar) \
do { \
int __cpu; \
for_each_possible_cpu(__cpu) \
spin_lock_init(&per_cpu(lvar, __cpu).lock); \
} while (0)
/*
* spin_lock|trylock|unlock_local flavour that does not migrate disable
* used for __local_lock|trylock|unlock where get_local_var/put_local_var
* already takes care of the migrate_disable/enable
* for CONFIG_PREEMPT_BASE map to the normal spin_* calls.
*/
#ifdef CONFIG_PREEMPT_RT_FULL
# define spin_lock_local(lock) rt_spin_lock(lock)
# define spin_trylock_local(lock) rt_spin_trylock(lock)
# define spin_unlock_local(lock) rt_spin_unlock(lock)
#else
# define spin_lock_local(lock) spin_lock(lock)
# define spin_trylock_local(lock) spin_trylock(lock)
# define spin_unlock_local(lock) spin_unlock(lock)
#endif
static inline void __local_lock(struct local_irq_lock *lv)
{
if (lv->owner != current) {
spin_lock_local(&lv->lock);
LL_WARN(lv->owner);
LL_WARN(lv->nestcnt);
lv->owner = current;
}
lv->nestcnt++;
}
#define local_lock(lvar) \
do { __local_lock(&get_local_var(lvar)); } while (0)
static inline int __local_trylock(struct local_irq_lock *lv)
{
if (lv->owner != current && spin_trylock_local(&lv->lock)) {
LL_WARN(lv->owner);
LL_WARN(lv->nestcnt);
lv->owner = current;
lv->nestcnt = 1;
return 1;
}
return 0;
}
#define local_trylock(lvar) \
({ \
int __locked; \
__locked = __local_trylock(&get_local_var(lvar)); \
if (!__locked) \
put_local_var(lvar); \
__locked; \
})
static inline void __local_unlock(struct local_irq_lock *lv)
{
LL_WARN(lv->nestcnt == 0);
LL_WARN(lv->owner != current);
if (--lv->nestcnt)
return;
lv->owner = NULL;
spin_unlock_local(&lv->lock);
}
#define local_unlock(lvar) \
do { \
__local_unlock(this_cpu_ptr(&lvar)); \
put_local_var(lvar); \
} while (0)
static inline void __local_lock_irq(struct local_irq_lock *lv)
{
spin_lock_irqsave(&lv->lock, lv->flags);
LL_WARN(lv->owner);
LL_WARN(lv->nestcnt);
lv->owner = current;
lv->nestcnt = 1;
}
#define local_lock_irq(lvar) \
do { __local_lock_irq(&get_local_var(lvar)); } while (0)
#define local_lock_irq_on(lvar, cpu) \
do { __local_lock_irq(&per_cpu(lvar, cpu)); } while (0)
static inline void __local_unlock_irq(struct local_irq_lock *lv)
{
LL_WARN(!lv->nestcnt);
LL_WARN(lv->owner != current);
lv->owner = NULL;
lv->nestcnt = 0;
spin_unlock_irq(&lv->lock);
}
#define local_unlock_irq(lvar) \
do { \
__local_unlock_irq(this_cpu_ptr(&lvar)); \
put_local_var(lvar); \
} while (0)
#define local_unlock_irq_on(lvar, cpu) \
do { \
__local_unlock_irq(&per_cpu(lvar, cpu)); \
} while (0)
static inline int __local_lock_irqsave(struct local_irq_lock *lv)
{
if (lv->owner != current) {
__local_lock_irq(lv);
return 0;
} else {
lv->nestcnt++;
return 1;
}
}
#define local_lock_irqsave(lvar, _flags) \
do { \
if (__local_lock_irqsave(&get_local_var(lvar))) \
put_local_var(lvar); \
_flags = __this_cpu_read(lvar.flags); \
} while (0)
#define local_lock_irqsave_on(lvar, _flags, cpu) \
do { \
__local_lock_irqsave(&per_cpu(lvar, cpu)); \
_flags = per_cpu(lvar, cpu).flags; \
} while (0)
static inline int __local_unlock_irqrestore(struct local_irq_lock *lv,
unsigned long flags)
{
LL_WARN(!lv->nestcnt);
LL_WARN(lv->owner != current);
if (--lv->nestcnt)
return 0;
lv->owner = NULL;
spin_unlock_irqrestore(&lv->lock, lv->flags);
return 1;
}
#define local_unlock_irqrestore(lvar, flags) \
do { \
if (__local_unlock_irqrestore(this_cpu_ptr(&lvar), flags)) \
put_local_var(lvar); \
} while (0)
#define local_unlock_irqrestore_on(lvar, flags, cpu) \
do { \
__local_unlock_irqrestore(&per_cpu(lvar, cpu), flags); \
} while (0)
#define local_spin_trylock_irq(lvar, lock) \
({ \
int __locked; \
local_lock_irq(lvar); \
__locked = spin_trylock(lock); \
if (!__locked) \
local_unlock_irq(lvar); \
__locked; \
})
#define local_spin_lock_irq(lvar, lock) \
do { \
local_lock_irq(lvar); \
spin_lock(lock); \
} while (0)
#define local_spin_unlock_irq(lvar, lock) \
do { \
spin_unlock(lock); \
local_unlock_irq(lvar); \
} while (0)
#define local_spin_lock_irqsave(lvar, lock, flags) \
do { \
local_lock_irqsave(lvar, flags); \
spin_lock(lock); \
} while (0)
#define local_spin_unlock_irqrestore(lvar, lock, flags) \
do { \
spin_unlock(lock); \
local_unlock_irqrestore(lvar, flags); \
} while (0)
#define get_locked_var(lvar, var) \
(*({ \
local_lock(lvar); \
this_cpu_ptr(&var); \
}))
#define put_locked_var(lvar, var) local_unlock(lvar);
#define local_lock_cpu(lvar) \
({ \
local_lock(lvar); \
smp_processor_id(); \
})
#define local_unlock_cpu(lvar) local_unlock(lvar)
#else /* PREEMPT_RT_BASE */
#define DEFINE_LOCAL_IRQ_LOCK(lvar) __typeof__(const int) lvar
#define DECLARE_LOCAL_IRQ_LOCK(lvar) extern __typeof__(const int) lvar
static inline void local_irq_lock_init(int lvar) { }
#define local_lock(lvar) preempt_disable()
#define local_unlock(lvar) preempt_enable()
#define local_lock_irq(lvar) local_irq_disable()
#define local_unlock_irq(lvar) local_irq_enable()
#define local_lock_irqsave(lvar, flags) local_irq_save(flags)
#define local_unlock_irqrestore(lvar, flags) local_irq_restore(flags)
#define local_spin_trylock_irq(lvar, lock) spin_trylock_irq(lock)
#define local_spin_lock_irq(lvar, lock) spin_lock_irq(lock)
#define local_spin_unlock_irq(lvar, lock) spin_unlock_irq(lock)
#define local_spin_lock_irqsave(lvar, lock, flags) \
spin_lock_irqsave(lock, flags)
#define local_spin_unlock_irqrestore(lvar, lock, flags) \
spin_unlock_irqrestore(lock, flags)
#define get_locked_var(lvar, var) get_cpu_var(var)
#define put_locked_var(lvar, var) put_cpu_var(var)
#define local_lock_cpu(lvar) get_cpu()
#define local_unlock_cpu(lvar) put_cpu()
#endif
#endif
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