sys/dev/drm/include/linux/timer.h

   1 /*
   2  * Copyright (c) 2010 Isilon Systems, Inc.
   3  * Copyright (c) 2010 iX Systems, Inc.
   4  * Copyright (c) 2010 Panasas, Inc.
   5  * Copyright (c) 2014-2020 François Tigeot <ftigeot@wolfpond.org>
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice unmodified, this list of conditions, and the following
  13  *    disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29 #ifndef _LINUX_TIMER_H_
  30 #define _LINUX_TIMER_H_
  31
  32 #include <linux/list.h>
  33 #include <linux/ktime.h>
  34 #include <linux/stddef.h>
  35 #include <linux/stringify.h>
  36
  37 #include <sys/callout.h>
  38
  39 struct timer_list {
  40         struct callout  timer_callout;
  41         void            (*function)(unsigned long);
  42         unsigned long   data;
  43         unsigned long   expires;
  44 };
  45
  46 static inline void
  47 _timer_fn(void *context)
  48 {
  49         struct timer_list *timer;
  50
  51         timer = context;
  52         timer->function(timer->data);
  53 }
  54
  55 #define setup_timer(timer, func, dat)                                   \
  56 do {                                                                    \
  57         (timer)->function = (func);                                     \
  58         (timer)->data = (dat);                                          \
  59         callout_init_mp(&(timer)->timer_callout);                       \
  60 } while (0)
  61
  62 #define setup_timer_on_stack(t, f,d)    setup_timer(t, f, d)
  63
  64 #define __setup_timer(timer, func, data, flags)                         \
  65 do {                                                                    \
  66         setup_timer(timer, func, data);                                 \
  67 } while (0)
  68
  69 #define init_timer(timer)                                               \
  70 do {                                                                    \
  71         (timer)->function = NULL;                                       \
  72         (timer)->data = 0;                                              \
  73         callout_init_mp(&(timer)->timer_callout);                       \
  74 } while (0)
  75
  76 #define mod_timer(timer, exp)                                           \
  77 do {                                                                    \
  78         (timer)->expires = (exp);                                       \
  79         callout_reset(&(timer)->timer_callout, (exp) - jiffies,         \
  80             _timer_fn, (timer));                                        \
  81 } while (0)
  82
  83 #define mod_timer_pinned(timer, exp)    mod_timer(timer, exp)
  84
  85 #define add_timer(timer)                                                \
  86         callout_reset(&(timer)->timer_callout,                          \
  87             (timer)->expires - jiffies, _timer_fn, (timer));            \
  88
  89 static inline void
  90 del_timer(struct timer_list *timer)
  91 {
  92         callout_stop(&(timer)->timer_callout);
  93 }
  94
  95 static inline int
  96 del_timer_sync(struct timer_list *timer)
  97 {
  98         return callout_drain(&(timer)->timer_callout) == 0;
  99 }
 100
 101 #define del_singleshot_timer_sync(timer)        del_timer_sync(timer)
 102
 103 #define timer_pending(timer)    callout_pending(&(timer)->timer_callout)
 104
 105 static inline unsigned long
 106 round_jiffies(unsigned long j)
 107 {
 108         return roundup(j, hz);
 109 }
 110
 111 static inline unsigned long
 112 round_jiffies_up(unsigned long j)
 113 {
 114         return roundup(j, hz);
 115 }
 116
 117 static inline unsigned long
 118 round_jiffies_up_relative(unsigned long j)
 119 {
 120         return roundup(j, hz);
 121 }
 122
 123 #define destroy_timer_on_stack(timer)
 124
 125 #define TIMER_IRQSAFE   0x00200000
 126
 127 #define from_timer(var, arg, field)                     \
 128         container_of(arg, typeof(*(var)), field)
 129
 130 static inline void
 131 timer_setup(struct timer_list *timer,
 132             void (*callback)(struct timer_list *),
 133             unsigned int flags)
 134 {
 135         setup_timer(timer,
 136             (void (*)(unsigned long))callback,
 137             (unsigned long)timer);
 138 }
 139
 140 #endif /* _LINUX_TIMER_H_ */