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qrwlock.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Queue read/write lock
 *
 * (C) Copyright 2013-2014 Hewlett-Packard Development Company, L.P.
 *
 * Authors: Waiman Long <waiman.long@hp.com>
 */
#ifndef __ASM_GENERIC_QRWLOCK_H
#define __ASM_GENERIC_QRWLOCK_H

#include <linux/atomic.h>
#include <asm/barrier.h>
#include <asm/processor.h>

#include <asm-generic/qrwlock_types.h>

/*
 * Writer states & reader shift and bias.
 */
#define	_QW_WAITING	0x100		/* A writer is waiting	   */
#define	_QW_LOCKED	0x0ff		/* A writer holds the lock */
#define	_QW_WMASK	0x1ff		/* Writer mask		   */
#define	_QR_SHIFT	9		/* Reader count shift	   */
#define _QR_BIAS	(1U << _QR_SHIFT)

/*
 * External function declarations
 */
extern void queued_read_lock_slowpath(struct qrwlock *lock);
extern void queued_write_lock_slowpath(struct qrwlock *lock);

/**
 * queued_read_trylock - try to acquire read lock of a queue rwlock
 * @lock : Pointer to queue rwlock structure
 * Return: 1 if lock acquired, 0 if failed
 */
static inline int queued_read_trylock(struct qrwlock *lock)
{
	u32 cnts;

cnts = atomic_read(&lock->cnts);
	if (likely(!(cnts & _QW_WMASK))) {
		cnts = (u32)atomic_add_return_acquire(_QR_BIAS, &lock->cnts);
		if (likely(!(cnts & _QW_WMASK)))
			return 1;
		atomic_sub(_QR_BIAS, &lock->cnts);
	}
	return 0;
}

/**
 * queued_write_trylock - try to acquire write lock of a queue rwlock
 * @lock : Pointer to queue rwlock structure
 * Return: 1 if lock acquired, 0 if failed
 */
static inline int queued_write_trylock(struct qrwlock *lock)
{
	u32 cnts;

cnts = atomic_read(&lock->cnts);
	if (unlikely(cnts))
		return 0;

return likely(atomic_try_cmpxchg_acquire(&lock->cnts, &cnts,
				_QW_LOCKED));
}
/**
 * queued_read_lock - acquire read lock of a queue rwlock
 * @lock: Pointer to queue rwlock structure
 */
static inline void queued_read_lock(struct qrwlock *lock)
{
	u32 cnts;

cnts = atomic_add_return_acquire(_QR_BIAS, &lock->cnts);
	if (likely(!(cnts & _QW_WMASK)))
		return;

/* The slowpath will decrement the reader count, if necessary. */
	queued_read_lock_slowpath(lock);
}

/**
 * queued_write_lock - acquire write lock of a queue rwlock
 * @lock : Pointer to queue rwlock structure
 */
static inline void queued_write_lock(struct qrwlock *lock)
{
	u32 cnts = 0;
	/* Optimize for the unfair lock case where the fair flag is 0. */
	if (likely(atomic_try_cmpxchg_acquire(&lock->cnts, &cnts, _QW_LOCKED)))
		return;

queued_write_lock_slowpath(lock);
}

/**
 * queued_read_unlock - release read lock of a queue rwlock
 * @lock : Pointer to queue rwlock structure
 */
static inline void queued_read_unlock(struct qrwlock *lock)
{
	/*
	 * Atomically decrement the reader count
	 */
	(void)atomic_sub_return_release(_QR_BIAS, &lock->cnts);
}

/**
 * queued_write_unlock - release write lock of a queue rwlock
 * @lock : Pointer to queue rwlock structure
 */
static inline void queued_write_unlock(struct qrwlock *lock)
{
	smp_store_release(&lock->wlocked, 0);
}

/*
 * Remapping rwlock architecture specific functions to the corresponding
 * queue rwlock functions.
 */
#define arch_read_lock(l)	queued_read_lock(l)
#define arch_write_lock(l)	queued_write_lock(l)
#define arch_read_trylock(l)	queued_read_trylock(l)
#define arch_write_trylock(l)	queued_write_trylock(l)
#define arch_read_unlock(l)	queued_read_unlock(l)
#define arch_write_unlock(l)	queued_write_unlock(l)

#endif /* __ASM_GENERIC_QRWLOCK_H */

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2022-03-28 12:15:32
..	dir	-	root/root	0755	2022-03-28 12:15:31
bitops	dir	-	root/root	0755	2022-03-28 12:15:32
vdso	dir	-	root/root	0755	2022-03-28 12:15:32
4level-fixup.h	text/x-c	1.07 KB	root/root	0644	2019-11-25 12:32:01
5level-fixup.h	text/x-c	1.35 KB	root/root	0644	2019-11-25 12:32:01
Kbuild	text/plain	233 B	root/root	0644	2019-11-25 12:32:01
asm-offsets.h	text/x-c	35 B	root/root	0644	2019-11-25 12:32:01
asm-prototypes.h	text/x-c	507 B	root/root	0644	2019-11-25 12:32:01
atomic-instrumented.h	text/x-c	44.15 KB	root/root	0644	2019-11-25 12:32:01
atomic-long.h	text/x-c	18.76 KB	root/root	0644	2019-11-25 12:32:01
atomic.h	text/x-c	4.12 KB	root/root	0644	2019-11-25 12:32:01
atomic64.h	text/x-c	1.55 KB	root/root	0644	2019-11-25 12:32:01
audit_change_attr.h	text/x-c	484 B	root/root	0644	2019-11-25 12:32:01
audit_dir_write.h	text/x-c	528 B	root/root	0644	2019-11-25 12:32:01
audit_read.h	text/x-c	241 B	root/root	0644	2019-11-25 12:32:01
audit_signal.h	application/csv	36 B	root/root	0644	2019-11-25 12:32:01
audit_write.h	text/x-c	461 B	root/root	0644	2019-11-25 12:32:01
barrier.h	text/x-c	5.77 KB	root/root	0644	2019-11-25 12:32:01
bitops-instrumented.h	text/x-c	7.72 KB	root/root	0644	2019-11-25 12:32:01
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checksum.h	text/x-c	2.27 KB	root/root	0644	2019-11-25 12:32:01
cmpxchg-local.h	text/x-c	1.43 KB	root/root	0644	2019-11-25 12:32:01
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gpio.h	text/x-c	4.45 KB	root/root	0644	2019-11-25 12:32:01
hardirq.h	text/x-c	532 B	root/root	0644	2019-11-25 12:32:01
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hw_irq.h	text/x-c	270 B	root/root	0644	2019-11-25 12:32:01
ide_iops.h	text/plain	791 B	root/root	0644	2019-11-25 12:32:01
int-ll64.h	text/x-c	863 B	root/root	0644	2019-11-25 12:32:01
io.h	text/x-c	22.34 KB	root/root	0644	2019-11-25 12:32:01
ioctl.h	text/x-c	506 B	root/root	0644	2019-11-25 12:32:01
iomap.h	text/x-c	3.94 KB	root/root	0644	2019-11-25 12:32:01
irq.h	text/x-c	403 B	root/root	0644	2019-11-25 12:32:01
irq_regs.h	text/x-c	773 B	root/root	0644	2019-11-25 12:32:01
irq_work.h	text/x-c	194 B	root/root	0644	2019-11-25 12:32:01
irqflags.h	text/x-c	1.51 KB	root/root	0644	2019-11-25 12:32:01
kdebug.h	text/x-c	182 B	root/root	0644	2019-11-25 12:32:01
kmap_types.h	text/x-c	198 B	root/root	0644	2019-11-25 12:32:01
kprobes.h	text/x-c	868 B	root/root	0644	2019-11-25 12:32:01
kvm_para.h	text/x-c	549 B	root/root	0644	2019-11-25 12:32:01
linkage.h	text/x-c	225 B	root/root	0644	2019-11-25 12:32:01
local.h	text/x-c	2.23 KB	root/root	0644	2019-11-25 12:32:01
local64.h	text/x-c	3.8 KB	root/root	0644	2019-11-25 12:32:01
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memory_model.h	text/x-c	2.16 KB	root/root	0644	2019-11-25 12:32:01
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module.h	text/x-c	1.09 KB	root/root	0644	2019-11-25 12:32:01
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pci.h	text/x-c	401 B	root/root	0644	2019-11-25 12:32:01
pci_iomap.h	text/x-c	1.73 KB	root/root	0644	2019-11-25 12:32:01
percpu.h	text/x-c	12.65 KB	root/root	0644	2019-11-25 12:32:01
pgalloc.h	text/x-c	2.77 KB	root/root	0644	2019-11-25 12:32:01
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preempt.h	text/x-c	1.95 KB	root/root	0644	2019-11-25 12:32:01
qrwlock.h	text/x-c	3.35 KB	root/root	0644	2019-11-25 12:32:01
qrwlock_types.h	text/x-c	682 B	root/root	0644	2019-11-25 12:32:01
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shmparam.h	text/x-c	207 B	root/root	0644	2019-11-25 12:32:01
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spinlock.h	text/x-c	329 B	root/root	0644	2019-11-25 12:32:01
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string.h	text/x-c	281 B	root/root	0644	2019-11-25 12:32:01
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syscalls.h	text/x-c	739 B	root/root	0644	2019-11-25 12:32:01
termios-base.h	text/x-c	2.11 KB	root/root	0644	2019-11-25 12:32:01
termios.h	text/x-c	2.81 KB	root/root	0644	2019-11-25 12:32:01
timex.h	text/x-c	508 B	root/root	0644	2019-11-25 12:32:01
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topology.h	text/x-c	2.18 KB	root/root	0644	2022-03-07 04:07:14
trace_clock.h	text/x-c	391 B	root/root	0644	2019-11-25 12:32:01
uaccess.h	text/x-c	6.19 KB	root/root	0644	2019-11-25 12:32:01
unaligned.h	text/x-c	1.05 KB	root/root	0644	2019-11-25 12:32:01
user.h	text/x-c	242 B	root/root	0644	2019-11-25 12:32:01
vga.h	text/x-c	587 B	root/root	0644	2019-11-25 12:32:01
vmlinux.lds.h	text/x-c	28.96 KB	root/root	0644	2022-03-07 04:07:14
vtime.h	text/plain	52 B	root/root	0644	2019-11-25 12:32:01
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xor.h	text/x-c	13.24 KB	root/root	0644	2019-11-25 12:32:01

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