LCOV - code coverage report
Current view: top level - include/linux - timer.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 4 5 80.0 %
Date: 2014-02-18 Functions: 0 0 -
Branches: 4 12 33.3 %

           Branch data     Line data    Source code
       1                 :            : #ifndef _LINUX_TIMER_H
       2                 :            : #define _LINUX_TIMER_H
       3                 :            : 
       4                 :            : #include <linux/list.h>
       5                 :            : #include <linux/ktime.h>
       6                 :            : #include <linux/stddef.h>
       7                 :            : #include <linux/debugobjects.h>
       8                 :            : #include <linux/stringify.h>
       9                 :            : 
      10                 :            : struct tvec_base;
      11                 :            : 
      12                 :            : struct timer_list {
      13                 :            :         /*
      14                 :            :          * All fields that change during normal runtime grouped to the
      15                 :            :          * same cacheline
      16                 :            :          */
      17                 :            :         struct list_head entry;
      18                 :            :         unsigned long expires;
      19                 :            :         struct tvec_base *base;
      20                 :            : 
      21                 :            :         void (*function)(unsigned long);
      22                 :            :         unsigned long data;
      23                 :            : 
      24                 :            :         int slack;
      25                 :            : 
      26                 :            : #ifdef CONFIG_TIMER_STATS
      27                 :            :         int start_pid;
      28                 :            :         void *start_site;
      29                 :            :         char start_comm[16];
      30                 :            : #endif
      31                 :            : #ifdef CONFIG_LOCKDEP
      32                 :            :         struct lockdep_map lockdep_map;
      33                 :            : #endif
      34                 :            : };
      35                 :            : 
      36                 :            : extern struct tvec_base boot_tvec_bases;
      37                 :            : 
      38                 :            : #ifdef CONFIG_LOCKDEP
      39                 :            : /*
      40                 :            :  * NB: because we have to copy the lockdep_map, setting the lockdep_map key
      41                 :            :  * (second argument) here is required, otherwise it could be initialised to
      42                 :            :  * the copy of the lockdep_map later! We use the pointer to and the string
      43                 :            :  * "<file>:<line>" as the key resp. the name of the lockdep_map.
      44                 :            :  */
      45                 :            : #define __TIMER_LOCKDEP_MAP_INITIALIZER(_kn)                            \
      46                 :            :         .lockdep_map = STATIC_LOCKDEP_MAP_INIT(_kn, &_kn),
      47                 :            : #else
      48                 :            : #define __TIMER_LOCKDEP_MAP_INITIALIZER(_kn)
      49                 :            : #endif
      50                 :            : 
      51                 :            : /*
      52                 :            :  * Note that all tvec_bases are at least 4 byte aligned and lower two bits
      53                 :            :  * of base in timer_list is guaranteed to be zero. Use them for flags.
      54                 :            :  *
      55                 :            :  * A deferrable timer will work normally when the system is busy, but
      56                 :            :  * will not cause a CPU to come out of idle just to service it; instead,
      57                 :            :  * the timer will be serviced when the CPU eventually wakes up with a
      58                 :            :  * subsequent non-deferrable timer.
      59                 :            :  *
      60                 :            :  * An irqsafe timer is executed with IRQ disabled and it's safe to wait for
      61                 :            :  * the completion of the running instance from IRQ handlers, for example,
      62                 :            :  * by calling del_timer_sync().
      63                 :            :  *
      64                 :            :  * Note: The irq disabled callback execution is a special case for
      65                 :            :  * workqueue locking issues. It's not meant for executing random crap
      66                 :            :  * with interrupts disabled. Abuse is monitored!
      67                 :            :  */
      68                 :            : #define TIMER_DEFERRABLE                0x1LU
      69                 :            : #define TIMER_IRQSAFE                   0x2LU
      70                 :            : 
      71                 :            : #define TIMER_FLAG_MASK                 0x3LU
      72                 :            : 
      73                 :            : #define __TIMER_INITIALIZER(_function, _expires, _data, _flags) { \
      74                 :            :                 .entry = { .prev = TIMER_ENTRY_STATIC },        \
      75                 :            :                 .function = (_function),                        \
      76                 :            :                 .expires = (_expires),                          \
      77                 :            :                 .data = (_data),                                \
      78                 :            :                 .base = (void *)((unsigned long)&boot_tvec_bases + (_flags)), \
      79                 :            :                 .slack = -1,                                    \
      80                 :            :                 __TIMER_LOCKDEP_MAP_INITIALIZER(                \
      81                 :            :                         __FILE__ ":" __stringify(__LINE__))   \
      82                 :            :         }
      83                 :            : 
      84                 :            : #define TIMER_INITIALIZER(_function, _expires, _data)           \
      85                 :            :         __TIMER_INITIALIZER((_function), (_expires), (_data), 0)
      86                 :            : 
      87                 :            : #define TIMER_DEFERRED_INITIALIZER(_function, _expires, _data)  \
      88                 :            :         __TIMER_INITIALIZER((_function), (_expires), (_data), TIMER_DEFERRABLE)
      89                 :            : 
      90                 :            : #define DEFINE_TIMER(_name, _function, _expires, _data)         \
      91                 :            :         struct timer_list _name =                               \
      92                 :            :                 TIMER_INITIALIZER(_function, _expires, _data)
      93                 :            : 
      94                 :            : void init_timer_key(struct timer_list *timer, unsigned int flags,
      95                 :            :                     const char *name, struct lock_class_key *key);
      96                 :            : 
      97                 :            : #ifdef CONFIG_DEBUG_OBJECTS_TIMERS
      98                 :            : extern void init_timer_on_stack_key(struct timer_list *timer,
      99                 :            :                                     unsigned int flags, const char *name,
     100                 :            :                                     struct lock_class_key *key);
     101                 :            : extern void destroy_timer_on_stack(struct timer_list *timer);
     102                 :            : #else
     103                 :            : static inline void destroy_timer_on_stack(struct timer_list *timer) { }
     104                 :            : static inline void init_timer_on_stack_key(struct timer_list *timer,
     105                 :            :                                            unsigned int flags, const char *name,
     106                 :            :                                            struct lock_class_key *key)
     107                 :            : {
     108                 :     431441 :         init_timer_key(timer, flags, name, key);
     109                 :            : }
     110                 :            : #endif
     111                 :            : 
     112                 :            : #ifdef CONFIG_LOCKDEP
     113                 :            : #define __init_timer(_timer, _flags)                                    \
     114                 :            :         do {                                                            \
     115                 :            :                 static struct lock_class_key __key;                     \
     116                 :            :                 init_timer_key((_timer), (_flags), #_timer, &__key);        \
     117                 :            :         } while (0)
     118                 :            : 
     119                 :            : #define __init_timer_on_stack(_timer, _flags)                           \
     120                 :            :         do {                                                            \
     121                 :            :                 static struct lock_class_key __key;                     \
     122                 :            :                 init_timer_on_stack_key((_timer), (_flags), #_timer, &__key); \
     123                 :            :         } while (0)
     124                 :            : #else
     125                 :            : #define __init_timer(_timer, _flags)                                    \
     126                 :            :         init_timer_key((_timer), (_flags), NULL, NULL)
     127                 :            : #define __init_timer_on_stack(_timer, _flags)                           \
     128                 :            :         init_timer_on_stack_key((_timer), (_flags), NULL, NULL)
     129                 :            : #endif
     130                 :            : 
     131                 :            : #define init_timer(timer)                                               \
     132                 :            :         __init_timer((timer), 0)
     133                 :            : #define init_timer_deferrable(timer)                                    \
     134                 :            :         __init_timer((timer), TIMER_DEFERRABLE)
     135                 :            : #define init_timer_on_stack(timer)                                      \
     136                 :            :         __init_timer_on_stack((timer), 0)
     137                 :            : 
     138                 :            : #define __setup_timer(_timer, _fn, _data, _flags)                       \
     139                 :            :         do {                                                            \
     140                 :            :                 __init_timer((_timer), (_flags));                       \
     141                 :            :                 (_timer)->function = (_fn);                          \
     142                 :            :                 (_timer)->data = (_data);                            \
     143                 :            :         } while (0)
     144                 :            : 
     145                 :            : #define __setup_timer_on_stack(_timer, _fn, _data, _flags)              \
     146                 :            :         do {                                                            \
     147                 :            :                 __init_timer_on_stack((_timer), (_flags));              \
     148                 :            :                 (_timer)->function = (_fn);                          \
     149                 :            :                 (_timer)->data = (_data);                            \
     150                 :            :         } while (0)
     151                 :            : 
     152                 :            : #define setup_timer(timer, fn, data)                                    \
     153                 :            :         __setup_timer((timer), (fn), (data), 0)
     154                 :            : #define setup_timer_on_stack(timer, fn, data)                           \
     155                 :            :         __setup_timer_on_stack((timer), (fn), (data), 0)
     156                 :            : #define setup_deferrable_timer_on_stack(timer, fn, data)                \
     157                 :            :         __setup_timer_on_stack((timer), (fn), (data), TIMER_DEFERRABLE)
     158                 :            : 
     159                 :            : /**
     160                 :            :  * timer_pending - is a timer pending?
     161                 :            :  * @timer: the timer in question
     162                 :            :  *
     163                 :            :  * timer_pending will tell whether a given timer is currently pending,
     164                 :            :  * or not. Callers must ensure serialization wrt. other operations done
     165                 :            :  * to this timer, eg. interrupt contexts, or other CPUs on SMP.
     166                 :            :  *
     167                 :            :  * return value: 1 if the timer is pending, 0 if not.
     168                 :            :  */
     169                 :            : static inline int timer_pending(const struct timer_list * timer)
     170                 :            : {
     171                 :    1715791 :         return timer->entry.next != NULL;
     172                 :            : }
     173                 :            : 
     174                 :            : extern void add_timer_on(struct timer_list *timer, int cpu);
     175                 :            : extern int del_timer(struct timer_list * timer);
     176                 :            : extern int mod_timer(struct timer_list *timer, unsigned long expires);
     177                 :            : extern int mod_timer_pending(struct timer_list *timer, unsigned long expires);
     178                 :            : extern int mod_timer_pinned(struct timer_list *timer, unsigned long expires);
     179                 :            : 
     180                 :            : extern void set_timer_slack(struct timer_list *time, int slack_hz);
     181                 :            : 
     182                 :            : #define TIMER_NOT_PINNED        0
     183                 :            : #define TIMER_PINNED            1
     184                 :            : /*
     185                 :            :  * The jiffies value which is added to now, when there is no timer
     186                 :            :  * in the timer wheel:
     187                 :            :  */
     188                 :            : #define NEXT_TIMER_MAX_DELTA    ((1UL << 30) - 1)
     189                 :            : 
     190                 :            : /*
     191                 :            :  * Return when the next timer-wheel timeout occurs (in absolute jiffies),
     192                 :            :  * locks the timer base and does the comparison against the given
     193                 :            :  * jiffie.
     194                 :            :  */
     195                 :            : extern unsigned long get_next_timer_interrupt(unsigned long now);
     196                 :            : 
     197                 :            : /*
     198                 :            :  * Timer-statistics info:
     199                 :            :  */
     200                 :            : #ifdef CONFIG_TIMER_STATS
     201                 :            : 
     202                 :            : extern int timer_stats_active;
     203                 :            : 
     204                 :            : #define TIMER_STATS_FLAG_DEFERRABLE     0x1
     205                 :            : 
     206                 :            : extern void init_timer_stats(void);
     207                 :            : 
     208                 :            : extern void timer_stats_update_stats(void *timer, pid_t pid, void *startf,
     209                 :            :                                      void *timerf, char *comm,
     210                 :            :                                      unsigned int timer_flag);
     211                 :            : 
     212                 :            : extern void __timer_stats_timer_set_start_info(struct timer_list *timer,
     213                 :            :                                                void *addr);
     214                 :            : 
     215                 :            : static inline void timer_stats_timer_set_start_info(struct timer_list *timer)
     216                 :            : {
     217 [ -  + ][ -  + ]:    2910237 :         if (likely(!timer_stats_active))
         [ -  + ][ #  # ]
         [ -  + ][ #  # ]
     218                 :            :                 return;
     219                 :          0 :         __timer_stats_timer_set_start_info(timer, __builtin_return_address(0));
     220                 :            : }
     221                 :            : 
     222                 :            : static inline void timer_stats_timer_clear_start_info(struct timer_list *timer)
     223                 :            : {
     224                 :    1018489 :         timer->start_site = NULL;
     225                 :            : }
     226                 :            : #else
     227                 :            : static inline void init_timer_stats(void)
     228                 :            : {
     229                 :            : }
     230                 :            : 
     231                 :            : static inline void timer_stats_timer_set_start_info(struct timer_list *timer)
     232                 :            : {
     233                 :            : }
     234                 :            : 
     235                 :            : static inline void timer_stats_timer_clear_start_info(struct timer_list *timer)
     236                 :            : {
     237                 :            : }
     238                 :            : #endif
     239                 :            : 
     240                 :            : extern void add_timer(struct timer_list *timer);
     241                 :            : 
     242                 :            : extern int try_to_del_timer_sync(struct timer_list *timer);
     243                 :            : 
     244                 :            : #ifdef CONFIG_SMP
     245                 :            :   extern int del_timer_sync(struct timer_list *timer);
     246                 :            : #else
     247                 :            : # define del_timer_sync(t)              del_timer(t)
     248                 :            : #endif
     249                 :            : 
     250                 :            : #define del_singleshot_timer_sync(t) del_timer_sync(t)
     251                 :            : 
     252                 :            : extern void init_timers(void);
     253                 :            : extern void run_local_timers(void);
     254                 :            : struct hrtimer;
     255                 :            : extern enum hrtimer_restart it_real_fn(struct hrtimer *);
     256                 :            : 
     257                 :            : unsigned long __round_jiffies(unsigned long j, int cpu);
     258                 :            : unsigned long __round_jiffies_relative(unsigned long j, int cpu);
     259                 :            : unsigned long round_jiffies(unsigned long j);
     260                 :            : unsigned long round_jiffies_relative(unsigned long j);
     261                 :            : 
     262                 :            : unsigned long __round_jiffies_up(unsigned long j, int cpu);
     263                 :            : unsigned long __round_jiffies_up_relative(unsigned long j, int cpu);
     264                 :            : unsigned long round_jiffies_up(unsigned long j);
     265                 :            : unsigned long round_jiffies_up_relative(unsigned long j);
     266                 :            : 
     267                 :            : #endif

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