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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Queued spinlock
*
* A 'generic' spinlock implementation that is based on MCS locks. For an
* architecture that's looking for a 'generic' spinlock, please first consider
* ticket-lock.h and only come looking here when you've considered all the
* constraints below and can show your hardware does actually perform better
* with qspinlock.
*
* qspinlock relies on atomic_*_release()/atomic_*_acquire() to be RCsc (or no
* weaker than RCtso if you're power), where regular code only expects atomic_t
* to be RCpc.
*
* qspinlock relies on a far greater (compared to asm-generic/spinlock.h) set
* of atomic operations to behave well together, please audit them carefully to
* ensure they all have forward progress. Many atomic operations may default to
* cmpxchg() loops which will not have good forward progress properties on
* LL/SC architectures.
*
* One notable example is atomic_fetch_or_acquire(), which x86 cannot (cheaply)
* do. Carefully read the patches that introduced
* queued_fetch_set_pending_acquire().
*
* qspinlock also heavily relies on mixed size atomic operations, in specific
* it requires architectures to have xchg16; something which many LL/SC
* architectures need to implement as a 32bit and+or in order to satisfy the
* forward progress guarantees mentioned above.
*
* Further reading on mixed size atomics that might be relevant:
*
* http://www.cl.cam.ac.uk/~pes20/popl17/mixed-size.pdf
*
* (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>
#include <linux/atomic.h>
#ifndef queued_spin_is_locked
/**
* queued_spin_is_locked - is the spinlock locked?
* @lock: Pointer to queued spinlock structure
* Return: 1 if it is locked, 0 otherwise
*/
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 !lock.val.counter;
}
/**
* 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)
{
int val = atomic_read(&lock->val);
if (unlikely(val))
return 0;
return likely(atomic_try_cmpxchg_acquire(&lock->val, &val, _Q_LOCKED_VAL));
}
extern void queued_spin_lock_slowpath(struct qspinlock *lock, u32 val);
#ifndef queued_spin_lock
/**
* queued_spin_lock - acquire a queued spinlock
* @lock: Pointer to queued spinlock structure
*/
static __always_inline void queued_spin_lock(struct qspinlock *lock)
{
int val = 0;
if (likely(atomic_try_cmpxchg_acquire(&lock->val, &val, _Q_LOCKED_VAL)))
return;
queued_spin_lock_slowpath(lock, val);
}
#endif
#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:
*/
smp_store_release(&lock->locked, 0);
}
#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 */
| Name | Type | Size | Permission | Actions |
|---|---|---|---|---|
| bitops | Folder | 0755 |
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| vdso | Folder | 0755 |
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| Kbuild | File | 1.68 KB | 0644 |
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| access_ok.h | File | 1.37 KB | 0644 |
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| archrandom.h | File | 342 B | 0644 |
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| asm-prototypes.h | File | 507 B | 0644 |
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| atomic.h | File | 3.49 KB | 0644 |
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| atomic64.h | File | 2.49 KB | 0644 |
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| audit_change_attr.h | File | 484 B | 0644 |
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| audit_dir_write.h | File | 528 B | 0644 |
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| audit_read.h | File | 241 B | 0644 |
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| audit_signal.h | File | 36 B | 0644 |
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| audit_write.h | File | 461 B | 0644 |
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| barrier.h | File | 7.13 KB | 0644 |
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| bitops.h | File | 1.13 KB | 0644 |
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| checksum.h | File | 1.6 KB | 0644 |
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| cmpxchg-local.h | File | 1.43 KB | 0644 |
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| cmpxchg.h | File | 2.38 KB | 0644 |
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| compat.h | File | 3.67 KB | 0644 |
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| current.h | File | 256 B | 0644 |
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| delay.h | File | 1.13 KB | 0644 |
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| device.h | File | 245 B | 0644 |
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| div64.h | File | 7.48 KB | 0644 |
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| dma-mapping.h | File | 232 B | 0644 |
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| dma.h | File | 553 B | 0644 |
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| early_ioremap.h | File | 1.47 KB | 0644 |
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| error-injection.h | File | 1.13 KB | 0644 |
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| ftrace.h | File | 314 B | 0644 |
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| hw_irq.h | File | 270 B | 0644 |
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| ide_iops.h | File | 791 B | 0644 |
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| int-ll64.h | File | 863 B | 0644 |
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| io.h | File | 26.38 KB | 0644 |
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| ioctl.h | File | 506 B | 0644 |
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| iomap.h | File | 3.92 KB | 0644 |
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| irq.h | File | 403 B | 0644 |
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| irq_regs.h | File | 773 B | 0644 |
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| irq_work.h | File | 194 B | 0644 |
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| irqflags.h | File | 1.51 KB | 0644 |
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| kdebug.h | File | 182 B | 0644 |
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| kmap_size.h | File | 263 B | 0644 |
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| kprobes.h | File | 833 B | 0644 |
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| kvm_para.h | File | 549 B | 0644 |
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| kvm_types.h | File | 113 B | 0644 |
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| linkage.h | File | 225 B | 0644 |
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| local.h | File | 2.31 KB | 0644 |
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| local64.h | File | 4.04 KB | 0644 |
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| logic_io.h | File | 2.35 KB | 0644 |
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| mcs_spinlock.h | File | 260 B | 0644 |
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| memory_model.h | File | 1.75 KB | 0644 |
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| mm_hooks.h | File | 753 B | 0644 |
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| mmu_context.h | File | 1.62 KB | 0644 |
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| mshyperv.h | File | 11.13 KB | 0644 |
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| msi.h | File | 1.01 KB | 0644 |
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| nommu_context.h | File | 420 B | 0644 |
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| pci_iomap.h | File | 1.96 KB | 0644 |
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| percpu.h | File | 15.2 KB | 0644 |
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| pgalloc.h | File | 5.28 KB | 0644 |
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| pgtable-nop4d.h | File | 1.72 KB | 0644 |
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| pgtable_uffd.h | File | 1.03 KB | 0644 |
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| preempt.h | File | 1.95 KB | 0644 |
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| qrwlock.h | File | 3.99 KB | 0644 |
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| qrwlock_types.h | File | 683 B | 0644 |
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| qspinlock.h | File | 4.67 KB | 0644 |
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| qspinlock_types.h | File | 2.08 KB | 0644 |
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| resource.h | File | 1.07 KB | 0644 |
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| runtime-const.h | File | 414 B | 0644 |
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| rwonce.h | File | 2.86 KB | 0644 |
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| seccomp.h | File | 1.16 KB | 0644 |
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| sections.h | File | 7.16 KB | 0644 |
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| serial.h | File | 345 B | 0644 |
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| set_memory.h | File | 362 B | 0644 |
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| shmparam.h | File | 207 B | 0644 |
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| signal.h | File | 308 B | 0644 |
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| simd.h | File | 436 B | 0644 |
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| softirq_stack.h | File | 281 B | 0644 |
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| spinlock.h | File | 2.73 KB | 0644 |
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| spinlock_types.h | File | 404 B | 0644 |
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| statfs.h | File | 169 B | 0644 |
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| string.h | File | 281 B | 0644 |
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| switch_to.h | File | 755 B | 0644 |
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| syscall.h | File | 5.02 KB | 0644 |
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| syscalls.h | File | 739 B | 0644 |
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| termios.h | File | 205 B | 0644 |
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| timex.h | File | 508 B | 0644 |
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| tlb.h | File | 20.38 KB | 0644 |
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| tlbflush.h | File | 485 B | 0644 |
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| topology.h | File | 2.17 KB | 0644 |
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| trace_clock.h | File | 391 B | 0644 |
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| uaccess.h | File | 5.51 KB | 0644 |
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| unaligned.h | File | 3.32 KB | 0644 |
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| user.h | File | 242 B | 0644 |
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| vermagic.h | File | 179 B | 0644 |
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| vga.h | File | 587 B | 0644 |
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| vmlinux.lds.h | File | 32.04 KB | 0644 |
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| vtime.h | File | 52 B | 0644 |
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| word-at-a-time.h | File | 2.75 KB | 0644 |
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| xor.h | File | 14.33 KB | 0644 |
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