diff options
author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2010-10-14 02:01:34 -0400 |
---|---|---|
committer | Ingo Molnar <mingo@elte.hu> | 2010-10-18 13:58:50 -0400 |
commit | e360adbe29241a0194e10e20595360dd7b98a2b3 (patch) | |
tree | ef5fa5f50a895096bfb25bc11b25949603158238 /include/linux/irq_work.h | |
parent | 8e5fc1a7320baf6076391607515dceb61319b36a (diff) |
irq_work: Add generic hardirq context callbacks
Provide a mechanism that allows running code in IRQ context. It is
most useful for NMI code that needs to interact with the rest of the
system -- like wakeup a task to drain buffers.
Perf currently has such a mechanism, so extract that and provide it as
a generic feature, independent of perf so that others may also
benefit.
The IRQ context callback is generated through self-IPIs where
possible, or on architectures like powerpc the decrementer (the
built-in timer facility) is set to generate an interrupt immediately.
Architectures that don't have anything like this get to do with a
callback from the timer tick. These architectures can call
irq_work_run() at the tail of any IRQ handlers that might enqueue such
work (like the perf IRQ handler) to avoid undue latencies in
processing the work.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Kyle McMartin <kyle@mcmartin.ca>
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
[ various fixes ]
Signed-off-by: Huang Ying <ying.huang@intel.com>
LKML-Reference: <1287036094.7768.291.camel@yhuang-dev>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/irq_work.h')
-rw-r--r-- | include/linux/irq_work.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/include/linux/irq_work.h b/include/linux/irq_work.h new file mode 100644 index 000000000000..4fa09d4d0b71 --- /dev/null +++ b/include/linux/irq_work.h | |||
@@ -0,0 +1,20 @@ | |||
1 | #ifndef _LINUX_IRQ_WORK_H | ||
2 | #define _LINUX_IRQ_WORK_H | ||
3 | |||
4 | struct irq_work { | ||
5 | struct irq_work *next; | ||
6 | void (*func)(struct irq_work *); | ||
7 | }; | ||
8 | |||
9 | static inline | ||
10 | void init_irq_work(struct irq_work *entry, void (*func)(struct irq_work *)) | ||
11 | { | ||
12 | entry->next = NULL; | ||
13 | entry->func = func; | ||
14 | } | ||
15 | |||
16 | bool irq_work_queue(struct irq_work *entry); | ||
17 | void irq_work_run(void); | ||
18 | void irq_work_sync(struct irq_work *entry); | ||
19 | |||
20 | #endif /* _LINUX_IRQ_WORK_H */ | ||