217 lines
6.0 KiB
C
217 lines
6.0 KiB
C
/*-
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* Copyright (c) 2010 Isilon Systems, Inc.
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* Copyright (c) 2010 iX Systems, Inc.
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* Copyright (c) 2010 Panasas, Inc.
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* Copyright (c) 2013-2015 Mellanox Technologies, Ltd.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _LINUX_WORKQUEUE_H_
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#define _LINUX_WORKQUEUE_H_
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/timer.h>
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#include <linux/slab.h>
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#include <asm/atomic.h>
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#include <sys/taskqueue.h>
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struct workqueue_struct {
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struct taskqueue *taskqueue;
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atomic_t draining;
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};
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struct work_struct {
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struct task work_task;
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struct taskqueue *taskqueue;
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void (*fn)(struct work_struct *);
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};
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typedef __typeof(((struct work_struct *)0)->fn) work_func_t;
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struct delayed_work {
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struct work_struct work;
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struct callout timer;
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};
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extern void linux_work_fn(void *, int);
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extern void linux_flush_fn(void *, int);
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extern void linux_delayed_work_fn(void *);
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extern struct workqueue_struct *linux_create_workqueue_common(const char *, int);
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extern void destroy_workqueue(struct workqueue_struct *);
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static inline struct delayed_work *
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to_delayed_work(struct work_struct *work)
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{
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return container_of(work, struct delayed_work, work);
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}
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#define INIT_WORK(work, func) \
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do { \
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(work)->fn = (func); \
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(work)->taskqueue = NULL; \
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TASK_INIT(&(work)->work_task, 0, linux_work_fn, (work)); \
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} while (0)
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#define INIT_DELAYED_WORK(_work, func) \
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do { \
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INIT_WORK(&(_work)->work, func); \
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callout_init(&(_work)->timer, 1); \
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} while (0)
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#define INIT_DEFERRABLE_WORK(...) INIT_DELAYED_WORK(__VA_ARGS__)
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#define schedule_work(work) \
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do { \
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(work)->taskqueue = taskqueue_thread; \
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taskqueue_enqueue(taskqueue_thread, &(work)->work_task); \
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} while (0)
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#define flush_scheduled_work() flush_taskqueue(taskqueue_thread)
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static inline int
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queue_work(struct workqueue_struct *wq, struct work_struct *work)
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{
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work->taskqueue = wq->taskqueue;
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/* Check for draining */
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if (atomic_read(&wq->draining) != 0)
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return (!work->work_task.ta_pending);
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/* Return opposite value to align with Linux logic */
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return (!taskqueue_enqueue(wq->taskqueue, &work->work_task));
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}
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static inline int
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queue_delayed_work(struct workqueue_struct *wq, struct delayed_work *work,
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unsigned long delay)
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{
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int pending;
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work->work.taskqueue = wq->taskqueue;
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if (atomic_read(&wq->draining) != 0) {
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pending = work->work.work_task.ta_pending;
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} else if (delay != 0) {
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pending = work->work.work_task.ta_pending;
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callout_reset(&work->timer, delay, linux_delayed_work_fn, work);
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} else {
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callout_stop(&work->timer);
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pending = taskqueue_enqueue(work->work.taskqueue,
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&work->work.work_task);
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}
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return (!pending);
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}
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static inline bool
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schedule_delayed_work(struct delayed_work *dwork,
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unsigned long delay)
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{
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struct workqueue_struct wq;
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wq.taskqueue = taskqueue_thread;
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atomic_set(&wq.draining, 0);
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return (queue_delayed_work(&wq, dwork, delay));
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}
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#define create_singlethread_workqueue(name) \
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linux_create_workqueue_common(name, 1)
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#define create_workqueue(name) \
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linux_create_workqueue_common(name, MAXCPU)
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#define alloc_ordered_workqueue(name, flags) \
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linux_create_workqueue_common(name, 1)
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#define alloc_workqueue(name, flags, max_active) \
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linux_create_workqueue_common(name, max_active)
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#define flush_workqueue(wq) flush_taskqueue((wq)->taskqueue)
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static inline void
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flush_taskqueue(struct taskqueue *tq)
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{
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struct task flushtask;
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PHOLD(curproc);
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TASK_INIT(&flushtask, 0, linux_flush_fn, NULL);
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taskqueue_enqueue(tq, &flushtask);
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taskqueue_drain(tq, &flushtask);
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PRELE(curproc);
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}
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static inline void
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drain_workqueue(struct workqueue_struct *wq)
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{
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atomic_inc(&wq->draining);
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flush_taskqueue(wq->taskqueue);
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atomic_dec(&wq->draining);
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}
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static inline int
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cancel_work_sync(struct work_struct *work)
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{
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if (work->taskqueue &&
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taskqueue_cancel(work->taskqueue, &work->work_task, NULL))
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taskqueue_drain(work->taskqueue, &work->work_task);
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return 0;
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}
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/*
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* This may leave work running on another CPU as it does on Linux.
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*/
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static inline int
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cancel_delayed_work(struct delayed_work *work)
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{
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callout_stop(&work->timer);
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if (work->work.taskqueue)
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return (taskqueue_cancel(work->work.taskqueue,
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&work->work.work_task, NULL) == 0);
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return 0;
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}
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static inline int
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cancel_delayed_work_sync(struct delayed_work *work)
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{
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callout_drain(&work->timer);
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if (work->work.taskqueue &&
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taskqueue_cancel(work->work.taskqueue, &work->work.work_task, NULL))
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taskqueue_drain(work->work.taskqueue, &work->work.work_task);
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return 0;
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}
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static inline bool
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mod_delayed_work(struct workqueue_struct *wq, struct delayed_work *dwork,
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unsigned long delay)
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{
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cancel_delayed_work(dwork);
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queue_delayed_work(wq, dwork, delay);
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return false;
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}
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#endif /* _LINUX_WORKQUEUE_H_ */
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