FreeBSD/Linux Kernel Cross Reference
sys/compat/linuxkpi/common/include/linux/irq_work.h

     /*-
      * Copyright (c) 2020 The FreeBSD Foundation
      *
      * This software was developed by Emmanuel Vadot under sponsorship
      * from the FreeBSD Foundation.
      *
      * 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, 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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 _LINUXKPI_LINUX_IRQ_WORK_H_
    #define _LINUXKPI_LINUX_IRQ_WORK_H_
    
    #include <sys/param.h>
    #include <sys/taskqueue.h>
    
    #include <linux/llist.h>
    #include <linux/workqueue.h>
    
    #define LKPI_IRQ_WORK_STD_TQ    system_wq->taskqueue
    #define LKPI_IRQ_WORK_FAST_TQ   linux_irq_work_tq
    
    #ifdef LKPI_IRQ_WORK_USE_FAST_TQ
    #define LKPI_IRQ_WORK_TQ        LKPI_IRQ_WORK_FAST_TQ
    #else
    #define LKPI_IRQ_WORK_TQ        LKPI_IRQ_WORK_STD_TQ
    #endif
    
    struct irq_work;
    typedef void (*irq_work_func_t)(struct irq_work *);
    
    struct irq_work {
            struct task irq_task;
            union {
                    struct llist_node llnode;
                    struct {
                            struct llist_node llist;
                    } node;
            };
            irq_work_func_t func;
    };
    
    extern struct taskqueue *linux_irq_work_tq;
    
    #define DEFINE_IRQ_WORK(name, _func)    struct irq_work name = {        \
            .irq_task = TASK_INITIALIZER(0, linux_irq_work_fn, &(name)),    \
            .func  = (_func),                                               \
    }
    
    void    linux_irq_work_fn(void *, int);
    
    static inline void
    init_irq_work(struct irq_work *irqw, irq_work_func_t func)
    {
            TASK_INIT(&irqw->irq_task, 0, linux_irq_work_fn, irqw);
            irqw->func = func;
    }
    
    static inline bool
    irq_work_queue(struct irq_work *irqw)
    {
            return (taskqueue_enqueue_flags(LKPI_IRQ_WORK_TQ, &irqw->irq_task,
                TASKQUEUE_FAIL_IF_PENDING) == 0);
    }
    
    static inline void
    irq_work_sync(struct irq_work *irqw)
    {
            taskqueue_drain(LKPI_IRQ_WORK_TQ, &irqw->irq_task);
    }
    
    #endif /* _LINUXKPI_LINUX_IRQ_WORK_H_ */

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