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      1 /*	$NetBSD: tasklet.h,v 1.7 2022/07/17 14:11:07 riastradh Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2018, 2020 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Taylor R. Campbell.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef	_LINUX_TASKLET_H_
     33 #define	_LINUX_TASKLET_H_
     34 
     35 /* namespace */
     36 #define	__tasklet_disable_sync_once	linux___tasklet_disable_sync_once
     37 #define	__tasklet_enable		linux___tasklet_enable
     38 #define	__tasklet_enable_sync_once	linux___tasklet_enable_sync_once
     39 #define	__tasklet_is_enabled		linux___tasklet_is_enabled
     40 #define	__tasklet_is_scheduled		linux___tasklet_is_scheduled
     41 #define	tasklet_disable			linux_tasklet_disable
     42 #define	tasklet_disable_nosync		linux_tasklet_disable_nosync
     43 #define	tasklet_enable			linux_tasklet_enable
     44 #define	tasklet_hi_schedule		linux_tasklet_hi_schedule
     45 #define	tasklet_init			linux_tasklet_init
     46 #define	tasklet_is_locked		linux_tasklet_is_locked
     47 #define	tasklet_kill			linux_tasklet_kill
     48 #define	tasklet_schedule		linux_tasklet_schedule
     49 #define	tasklet_struct			linux_tasklet_struct
     50 #define	tasklet_trylock			linux_tasklet_trylock
     51 #define	tasklet_unlock			linux_tasklet_unlock
     52 #define	tasklet_unlock_wait		linux_tasklet_unlock_wait
     53 
     54 struct tasklet_struct {
     55 	SIMPLEQ_ENTRY(tasklet_struct)	tl_entry;
     56 	volatile unsigned		tl_state;
     57 	volatile unsigned		tl_disablecount;
     58 	/* begin Linux API */
     59 	void				(*func)(unsigned long);
     60 	unsigned long			data;
     61 	/* end Linux API */
     62 };
     63 
     64 #define	DEFINE_TASKLET(name, func, data)				      \
     65 	struct tasklet_struct name = {					      \
     66 	    .tl_state = 0,						      \
     67 	    .tl_disablecount = 0,					      \
     68 	    .func = (func),						      \
     69 	    .data = (data),						      \
     70 	}
     71 
     72 #define	DEFINE_TASKLET_DISABLED(name, func, data)			      \
     73 	struct tasklet_struct name = {					      \
     74 	    .tl_state = 0,						      \
     75 	    .tl_disablecount = 1,					      \
     76 	    .func = (func),						      \
     77 	    .data = (data),						      \
     78 	}
     79 
     80 int	linux_tasklets_init(void);
     81 void	linux_tasklets_fini(void);
     82 
     83 void	tasklet_init(struct tasklet_struct *, void (*)(unsigned long),
     84 	    unsigned long);
     85 void	tasklet_disable_nosync(struct tasklet_struct *);
     86 void	tasklet_disable(struct tasklet_struct *);
     87 void	tasklet_enable(struct tasklet_struct *);
     88 void	tasklet_schedule(struct tasklet_struct *);
     89 void	tasklet_hi_schedule(struct tasklet_struct *);
     90 void	tasklet_kill(struct tasklet_struct *);
     91 
     92 bool	tasklet_is_locked(const struct tasklet_struct *);
     93 bool	tasklet_trylock(struct tasklet_struct *);
     94 void	tasklet_unlock(struct tasklet_struct *);
     95 void	tasklet_unlock_wait(const struct tasklet_struct *);
     96 
     97 /* i915 hacks */
     98 void	__tasklet_disable_sync_once(struct tasklet_struct *);
     99 void	__tasklet_enable_sync_once(struct tasklet_struct *);
    100 bool	__tasklet_is_enabled(const struct tasklet_struct *);
    101 bool	__tasklet_is_scheduled(const struct tasklet_struct *);
    102 bool	__tasklet_enable(struct tasklet_struct *);
    103 
    104 #endif	/* _LINUX_TASKLET_H_ */
    105