diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2007-02-16 01:28:02 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-02-16 08:13:59 -0800 |
| commit | f8381cba04ba8173fd5a2b8e5cd8b3290ee13a98 (patch) | |
| tree | ad8c9f91ce031a04c62ff75fcd3237fc666f1c2e /kernel/time/tick-internal.h | |
| parent | 906568c9c668ff994f4078932ec6ae1e3950d1af (diff) | |
| download | linux-f8381cba04ba8173fd5a2b8e5cd8b3290ee13a98.tar.gz | |
[PATCH] tick-management: broadcast functionality
With Ingo Molnar <mingo@elte.hu>
Add broadcast functionality, so per cpu clock event devices can be registered
as dummy devices or switched from/to broadcast on demand. The broadcast
function distributes the events via the broadcast function of the clock event
device. This is primarily designed to replace the switch apic timer to / from
IPI in power states, where the apic stops.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/time/tick-internal.h')
| -rw-r--r-- | kernel/time/tick-internal.h | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/kernel/time/tick-internal.h b/kernel/time/tick-internal.h new file mode 100644 index 0000000000000..9272f446b21c7 --- /dev/null +++ b/kernel/time/tick-internal.h @@ -0,0 +1,65 @@ +/* + * tick internal variable and functions used by low/high res code + */ +DECLARE_PER_CPU(struct tick_device, tick_cpu_device); +extern spinlock_t tick_device_lock; +extern ktime_t tick_next_period; +extern ktime_t tick_period; + +extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast); +extern void tick_handle_periodic(struct clock_event_device *dev); + +/* + * Broadcasting support + */ +#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST +extern int tick_do_broadcast(cpumask_t mask); +extern struct tick_device tick_broadcast_device; +extern spinlock_t tick_broadcast_lock; + +extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu); +extern int tick_check_broadcast_device(struct clock_event_device *dev); +extern int tick_is_broadcast_device(struct clock_event_device *dev); +extern void tick_broadcast_on_off(unsigned long reason, int *oncpu); +extern void tick_shutdown_broadcast(unsigned int *cpup); + +extern void +tick_set_periodic_handler(struct clock_event_device *dev, int broadcast); + +#else /* !BROADCAST */ + +static inline int tick_check_broadcast_device(struct clock_event_device *dev) +{ + return 0; +} + +static inline int tick_is_broadcast_device(struct clock_event_device *dev) +{ + return 0; +} +static inline int tick_device_uses_broadcast(struct clock_event_device *dev, + int cpu) +{ + return 0; +} +static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { } +static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { } +static inline void tick_shutdown_broadcast(unsigned int *cpup) { } + +/* + * Set the periodic handler in non broadcast mode + */ +static inline void tick_set_periodic_handler(struct clock_event_device *dev, + int broadcast) +{ + dev->event_handler = tick_handle_periodic; +} +#endif /* !BROADCAST */ + +/* + * Check, if the device is functional or a dummy for broadcast + */ +static inline int tick_device_is_functional(struct clock_event_device *dev) +{ + return !(dev->features & CLOCK_EVT_FEAT_DUMMY); +} |