1 /*- 2 * Copyright (c) 2020 The FreeBSD Foundation 3 * 4 * This software was developed by Emmanuel Vadot under sponsorship 5 * from the FreeBSD Foundation. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #ifndef _LINUXKPI_LINUX_IRQ_WORK_H_ 30 #define _LINUXKPI_LINUX_IRQ_WORK_H_ 31 32 #include <sys/param.h> 33 #include <sys/taskqueue.h> 34 35 #include <linux/llist.h> 36 #include <linux/workqueue.h> 37 38 #define LKPI_IRQ_WORK_STD_TQ system_wq->taskqueue 39 #define LKPI_IRQ_WORK_FAST_TQ linux_irq_work_tq 40 41 #ifdef LKPI_IRQ_WORK_USE_FAST_TQ 42 #define LKPI_IRQ_WORK_TQ LKPI_IRQ_WORK_FAST_TQ 43 #else 44 #define LKPI_IRQ_WORK_TQ LKPI_IRQ_WORK_STD_TQ 45 #endif 46 47 struct irq_work; 48 typedef void (*irq_work_func_t)(struct irq_work *); 49 50 struct irq_work { 51 struct task irq_task; 52 union { 53 struct llist_node llnode; 54 struct { 55 struct llist_node llist; 56 } node; 57 }; 58 irq_work_func_t func; 59 }; 60 61 extern struct taskqueue *linux_irq_work_tq; 62 63 #define DEFINE_IRQ_WORK(name, _func) struct irq_work name = { \ 64 .irq_task = TASK_INITIALIZER(0, linux_irq_work_fn, &(name)), \ 65 .func = (_func), \ 66 } 67 68 void linux_irq_work_fn(void *, int); 69 70 static inline void 71 init_irq_work(struct irq_work *irqw, irq_work_func_t func) 72 { 73 TASK_INIT(&irqw->irq_task, 0, linux_irq_work_fn, irqw); 74 irqw->func = func; 75 } 76 77 static inline bool 78 irq_work_queue(struct irq_work *irqw) 79 { 80 return (taskqueue_enqueue_flags(LKPI_IRQ_WORK_TQ, &irqw->irq_task, 81 TASKQUEUE_FAIL_IF_PENDING) == 0); 82 } 83 84 static inline void 85 irq_work_sync(struct irq_work *irqw) 86 { 87 taskqueue_drain(LKPI_IRQ_WORK_TQ, &irqw->irq_task); 88 } 89 90 #endif /* _LINUXKPI_LINUX_IRQ_WORK_H_ */ 91