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/*
 * Queued spinlock
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * (C) Copyright 2013-2015 Hewlett-Packard Development Company, L.P.
 * (C) Copyright 2015 Hewlett-Packard Enterprise Development LP
 *
 * Authors: Waiman Long <waiman.long@hpe.com>
 */
#ifndef __ASM_GENERIC_QSPINLOCK_H
#define __ASM_GENERIC_QSPINLOCK_H

#include <asm-generic/qspinlock_types.h>

/**
 * queued_spin_is_locked - is the spinlock locked?
 * @lock: Pointer to queued spinlock structure
 * Return: 1 if it is locked, 0 otherwise
 */
#ifndef queued_spin_is_locked
static __always_inline int queued_spin_is_locked(struct qspinlock *lock)
{
	/*
	 * Any !0 state indicates it is locked, even if _Q_LOCKED_VAL
	 * isn't immediately observable.
	 */
	return atomic_read(&lock->val);
}
#endif

/**
 * queued_spin_value_unlocked - is the spinlock structure unlocked?
 * @lock: queued spinlock structure
 * Return: 1 if it is unlocked, 0 otherwise
 *
 * N.B. Whenever there are tasks waiting for the lock, it is considered
 *      locked wrt the lockref code to avoid lock stealing by the lockref
 *      code and change things underneath the lock. This also allows some
 *      optimizations to be applied without conflict with lockref.
 */
static __always_inline int queued_spin_value_unlocked(struct qspinlock lock)
{
	return !atomic_read(&lock.val);
}

/**
 * queued_spin_is_contended - check if the lock is contended
 * @lock : Pointer to queued spinlock structure
 * Return: 1 if lock contended, 0 otherwise
 */
static __always_inline int queued_spin_is_contended(struct qspinlock *lock)
{
	return atomic_read(&lock->val) & ~_Q_LOCKED_MASK;
}
/**
 * queued_spin_trylock - try to acquire the queued spinlock
 * @lock : Pointer to queued spinlock structure
 * Return: 1 if lock acquired, 0 if failed
 */
static __always_inline int queued_spin_trylock(struct qspinlock *lock)
{
	if (!atomic_read(&lock->val) &&
	   (atomic_cmpxchg_acquire(&lock->val, 0, _Q_LOCKED_VAL) == 0))
		return 1;
	return 0;
}

extern void queued_spin_lock_slowpath(struct qspinlock *lock, u32 val);

/**
 * queued_spin_lock - acquire a queued spinlock
 * @lock: Pointer to queued spinlock structure
 */
static __always_inline void queued_spin_lock(struct qspinlock *lock)
{
	u32 val;

	val = atomic_cmpxchg_acquire(&lock->val, 0, _Q_LOCKED_VAL);
	if (likely(val == 0))
		return;
	queued_spin_lock_slowpath(lock, val);
}

#ifndef queued_spin_unlock
/**
 * queued_spin_unlock - release a queued spinlock
 * @lock : Pointer to queued spinlock structure
 */
static __always_inline void queued_spin_unlock(struct qspinlock *lock)
{
	/*
	 * unlock() needs release semantics:
	 */
	(void)atomic_sub_return_release(_Q_LOCKED_VAL, &lock->val);
}
#endif

#ifndef virt_spin_lock
static __always_inline bool virt_spin_lock(struct qspinlock *lock)
{
	return false;
}
#endif

/*
 * Remapping spinlock architecture specific functions to the corresponding
 * queued spinlock functions.
 */
#define arch_spin_is_locked(l)		queued_spin_is_locked(l)
#define arch_spin_is_contended(l)	queued_spin_is_contended(l)
#define arch_spin_value_unlocked(l)	queued_spin_value_unlocked(l)
#define arch_spin_lock(l)		queued_spin_lock(l)
#define arch_spin_trylock(l)		queued_spin_trylock(l)
#define arch_spin_unlock(l)		queued_spin_unlock(l)

#endif /* __ASM_GENERIC_QSPINLOCK_H */

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Name Type Size Permission Actions
bitops Folder 0755
4level-fixup.h File 1.07 KB 0644
5level-fixup.h File 1.15 KB 0644
asm-offsets.h File 35 B 0644
asm-prototypes.h File 507 B 0644
atomic-long.h File 7.09 KB 0644
atomic.h File 5.11 KB 0644
atomic64.h File 2.26 KB 0644
audit_change_attr.h File 484 B 0644
audit_dir_write.h File 500 B 0644
audit_read.h File 241 B 0644
audit_signal.h File 36 B 0644
audit_write.h File 461 B 0644
barrier.h File 6.01 KB 0644
bitops.h File 1.09 KB 0644
bitsperlong.h File 592 B 0644
bug.h File 6.6 KB 0644
bugs.h File 267 B 0644
cache.h File 384 B 0644
cacheflush.h File 1.31 KB 0644
checksum.h File 2.27 KB 0644
clkdev.h File 706 B 0644
cmpxchg-local.h File 1.43 KB 0644
cmpxchg.h File 2.23 KB 0644
current.h File 256 B 0644
delay.h File 1.13 KB 0644
device.h File 245 B 0644
div64.h File 7.28 KB 0644
dma-contiguous.h File 238 B 0644
dma.h File 553 B 0644
early_ioremap.h File 1.66 KB 0644
emergency-restart.h File 248 B 0644
exec.h File 697 B 0644
export.h File 2.2 KB 0644
extable.h File 802 B 0644
fb.h File 271 B 0644
fixmap.h File 2.84 KB 0644
ftrace.h File 460 B 0644
futex.h File 2.88 KB 0644
getorder.h File 1.22 KB 0644
gpio.h File 4.45 KB 0644
hardirq.h File 532 B 0644
hugetlb.h File 845 B 0644
hw_irq.h File 270 B 0644
ide_iops.h File 791 B 0644
int-ll64.h File 932 B 0644
io.h File 20.39 KB 0644
ioctl.h File 506 B 0644
iomap.h File 3.16 KB 0644
irq.h File 403 B 0644
irq_regs.h File 980 B 0644
irq_work.h File 194 B 0644
irqflags.h File 1.51 KB 0644
kdebug.h File 182 B 0644
kmap_types.h File 198 B 0644
kprobes.h File 868 B 0644
kvm_para.h File 480 B 0644
linkage.h File 225 B 0644
local.h File 2.23 KB 0644
local64.h File 3.8 KB 0644
mcs_spinlock.h File 260 B 0644
memory_model.h File 2.16 KB 0644
mm-arch-hooks.h File 388 B 0644
mm_hooks.h File 885 B 0644
mmu.h File 449 B 0644
mmu_context.h File 881 B 0644
module.h File 1.09 KB 0644
msi.h File 838 B 0644
page.h File 2.4 KB 0644
param.h File 367 B 0644
parport.h File 604 B 0644
pci.h File 581 B 0644
pci_iomap.h File 1.96 KB 0644
percpu.h File 12.72 KB 0644
pgalloc.h File 342 B 0644
pgtable-nop4d-hack.h File 1.86 KB 0644
pgtable-nop4d.h File 1.64 KB 0644
pgtable-nopmd.h File 1.9 KB 0644
pgtable-nopud.h File 1.97 KB 0644
pgtable.h File 29.5 KB 0644
preempt.h File 1.94 KB 0644
ptrace.h File 1.58 KB 0644
qrwlock.h File 3.78 KB 0644
qrwlock_types.h File 655 B 0644
qspinlock.h File 3.67 KB 0644
qspinlock_types.h File 2.77 KB 0644
resource.h File 1.07 KB 0644
rwsem.h File 3.21 KB 0644
seccomp.h File 1.3 KB 0644
sections.h File 4.8 KB 0644
segment.h File 249 B 0644
serial.h File 345 B 0644
set_memory.h File 362 B 0644
signal.h File 308 B 0644
simd.h File 436 B 0644
sizes.h File 78 B 0644
spinlock.h File 329 B 0644
statfs.h File 169 B 0644
string.h File 281 B 0644
switch_to.h File 992 B 0644
syscall.h File 6.18 KB 0644
syscalls.h File 739 B 0644
termios-base.h File 2.11 KB 0644
termios.h File 2.81 KB 0644
timex.h File 508 B 0644
tlb.h File 9.4 KB 0644
tlbflush.h File 485 B 0644
topology.h File 2.18 KB 0644
trace_clock.h File 391 B 0644
uaccess.h File 5.22 KB 0644
unaligned.h File 1.05 KB 0644
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user.h File 242 B 0644
vga.h File 587 B 0644
vmlinux.lds.h File 29.17 KB 0644
vtime.h File 52 B 0644
word-at-a-time.h File 2.75 KB 0644
xor.h File 13.63 KB 0644