cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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irq_work.h (2053B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _LINUX_IRQ_WORK_H
      3#define _LINUX_IRQ_WORK_H
      4
      5#include <linux/smp_types.h>
      6#include <linux/rcuwait.h>
      7
      8/*
      9 * An entry can be in one of four states:
     10 *
     11 * free	     NULL, 0 -> {claimed}       : free to be used
     12 * claimed   NULL, 3 -> {pending}       : claimed to be enqueued
     13 * pending   next, 3 -> {busy}          : queued, pending callback
     14 * busy      NULL, 2 -> {free, claimed} : callback in progress, can be claimed
     15 */
     16
     17struct irq_work {
     18	struct __call_single_node node;
     19	void (*func)(struct irq_work *);
     20	struct rcuwait irqwait;
     21};
     22
     23#define __IRQ_WORK_INIT(_func, _flags) (struct irq_work){	\
     24	.node = { .u_flags = (_flags), },			\
     25	.func = (_func),					\
     26	.irqwait = __RCUWAIT_INITIALIZER(irqwait),		\
     27}
     28
     29#define IRQ_WORK_INIT(_func) __IRQ_WORK_INIT(_func, 0)
     30#define IRQ_WORK_INIT_LAZY(_func) __IRQ_WORK_INIT(_func, IRQ_WORK_LAZY)
     31#define IRQ_WORK_INIT_HARD(_func) __IRQ_WORK_INIT(_func, IRQ_WORK_HARD_IRQ)
     32
     33#define DEFINE_IRQ_WORK(name, _f)				\
     34	struct irq_work name = IRQ_WORK_INIT(_f)
     35
     36static inline
     37void init_irq_work(struct irq_work *work, void (*func)(struct irq_work *))
     38{
     39	*work = IRQ_WORK_INIT(func);
     40}
     41
     42static inline bool irq_work_is_pending(struct irq_work *work)
     43{
     44	return atomic_read(&work->node.a_flags) & IRQ_WORK_PENDING;
     45}
     46
     47static inline bool irq_work_is_busy(struct irq_work *work)
     48{
     49	return atomic_read(&work->node.a_flags) & IRQ_WORK_BUSY;
     50}
     51
     52static inline bool irq_work_is_hard(struct irq_work *work)
     53{
     54	return atomic_read(&work->node.a_flags) & IRQ_WORK_HARD_IRQ;
     55}
     56
     57bool irq_work_queue(struct irq_work *work);
     58bool irq_work_queue_on(struct irq_work *work, int cpu);
     59
     60void irq_work_tick(void);
     61void irq_work_sync(struct irq_work *work);
     62
     63#ifdef CONFIG_IRQ_WORK
     64#include <asm/irq_work.h>
     65
     66void irq_work_run(void);
     67bool irq_work_needs_cpu(void);
     68void irq_work_single(void *arg);
     69#else
     70static inline bool irq_work_needs_cpu(void) { return false; }
     71static inline void irq_work_run(void) { }
     72static inline void irq_work_single(void *arg) { }
     73#endif
     74
     75#endif /* _LINUX_IRQ_WORK_H */