source: rtems-libbsd/rtemsbsd/powerpc/include/linux/workqueue.h @ 65d6fa2

/*-
 * Copyright (c) 2010 Isilon Systems, Inc.
 * Copyright (c) 2010 iX Systems, Inc.
 * Copyright (c) 2010 Panasas, Inc.
 * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice unmodified, this list of conditions, and the following
 *    disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * $FreeBSD$
 */
#ifndef _LINUX_WORKQUEUE_H_
#define _LINUX_WORKQUEUE_H_

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/slab.h>

#include <sys/taskqueue.h>

struct workqueue_struct {
        struct taskqueue        *taskqueue;
};

struct work_struct {
        struct  task            work_task;
        struct  taskqueue       *taskqueue;
        void                    (*fn)(struct work_struct *);
};

struct delayed_work {
        struct work_struct      work;
        struct callout          timer;
};

static inline struct delayed_work *
to_delayed_work(struct work_struct *work)
{

        return container_of(work, struct delayed_work, work);
}


static inline void
_work_fn(void *context, int pending)
{
        struct work_struct *work;

        work = context;
        work->fn(work);
}

#define INIT_WORK(work, func)                                           \
do {                                                                    \
        (work)->fn = (func);                                            \
        (work)->taskqueue = NULL;                                       \
        TASK_INIT(&(work)->work_task, 0, _work_fn, (work));             \
} while (0)

#define INIT_DELAYED_WORK(_work, func)                                  \
do {                                                                    \
        INIT_WORK(&(_work)->work, func);                                \
        callout_init(&(_work)->timer, 1);                               \
} while (0)

#define INIT_DEFERRABLE_WORK    INIT_DELAYED_WORK

#define schedule_work(work)                                             \
do {                                                                    \
        (work)->taskqueue = taskqueue_thread;                           \
        taskqueue_enqueue(taskqueue_thread, &(work)->work_task);        \
} while (0)

#define flush_scheduled_work()  flush_taskqueue(taskqueue_thread)

static inline int queue_work(struct workqueue_struct *q, struct work_struct *work)
{
        (work)->taskqueue = (q)->taskqueue;
        /* Return opposite val to align with Linux logic */
        return !taskqueue_enqueue((q)->taskqueue, &(work)->work_task);
}

#define queue_work_on(cpu, q, work) queue_work(q, work)

static inline void
_delayed_work_fn(void *arg)
{
        struct delayed_work *work;

        work = arg;
        taskqueue_enqueue(work->work.taskqueue, &work->work.work_task);
}

static inline int
queue_delayed_work(struct workqueue_struct *wq, struct delayed_work *work,
    unsigned long delay)
{
        int pending;

        pending = work->work.work_task.ta_pending;
        work->work.taskqueue = wq->taskqueue;
        if (delay != 0)
                callout_reset(&work->timer, delay, _delayed_work_fn, work);
        else
                _delayed_work_fn((void *)work);

        return (!pending);
}

static inline bool schedule_delayed_work(struct delayed_work *dwork,
                                         unsigned long delay)
{
        struct workqueue_struct wq;
        wq.taskqueue = taskqueue_thread;
        return queue_delayed_work(&wq, dwork, delay);
}

static inline struct workqueue_struct *
_create_workqueue_common(char *name, int cpus)
{
        struct workqueue_struct *wq;

        wq = kmalloc(sizeof(*wq), M_WAITOK);
        wq->taskqueue = taskqueue_create((name), M_WAITOK,
            taskqueue_thread_enqueue,  &wq->taskqueue);
        taskqueue_start_threads(&wq->taskqueue, cpus, PWAIT, "%s", name);

        return (wq);
}


#define create_singlethread_workqueue(name)                             \
        _create_workqueue_common(name, 1)

#define create_workqueue(name)                                          \
        _create_workqueue_common(name, MAXCPU)

#define alloc_ordered_workqueue(name, flags)                            \
        _create_workqueue_common(name, 1)

#define alloc_workqueue(name, flags, max_active)                        \
        _create_workqueue_common(name, max_active)

static inline void
destroy_workqueue(struct workqueue_struct *wq)
{
        taskqueue_free(wq->taskqueue);
        kfree(wq);
}

#define flush_workqueue(wq)     flush_taskqueue((wq)->taskqueue)

static inline void
_flush_fn(void *context, int pending)
{
}

static inline void
flush_taskqueue(struct taskqueue *tq)
{
        struct task flushtask;

        PHOLD(curproc);
        TASK_INIT(&flushtask, 0, _flush_fn, NULL);
        taskqueue_enqueue(tq, &flushtask);
        taskqueue_drain(tq, &flushtask);
        PRELE(curproc);
}

static inline int
cancel_work_sync(struct work_struct *work)
{
        if (work->taskqueue &&
            taskqueue_cancel(work->taskqueue, &work->work_task, NULL))
                taskqueue_drain(work->taskqueue, &work->work_task);
        return 0;
}

/*
 * This may leave work running on another CPU as it does on Linux.
 */
static inline int
cancel_delayed_work(struct delayed_work *work)
{

        callout_stop(&work->timer);
        if (work->work.taskqueue)
                return (taskqueue_cancel(work->work.taskqueue,
                    &work->work.work_task, NULL) == 0);
        return 0;
}

static inline int
cancel_delayed_work_sync(struct delayed_work *work)
{

        callout_drain(&work->timer);
        if (work->work.taskqueue &&
            taskqueue_cancel(work->work.taskqueue, &work->work.work_task, NULL))
                taskqueue_drain(work->work.taskqueue, &work->work.work_task);
        return 0;
}

static inline bool
mod_delayed_work(struct workqueue_struct *wq, struct delayed_work *dwork,
                                      unsigned long delay)
{
        cancel_delayed_work(dwork);
        queue_delayed_work(wq, dwork, delay);
        return false;
}

#endif  /* _LINUX_WORKQUEUE_H_ */