A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-28 18:51:56 -04:00
Code Issues Projects Releases Packages Wiki Activity

irq_work: Add generic hardirq context callbacks

Browse source 
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 <[email protected]>
Acked-by: Kyle McMartin <[email protected]>
Acked-by: Martin Schwidefsky <[email protected]>
[ various fixes ]
Signed-off-by: Huang Ying <[email protected]>
LKML-Reference: <1287036094.7768.291.camel@yhuang-dev>
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Peter Zijlstra 2010-10-14 14:01:34 +08:00 • committed by Ingo Molnar
commit e360adbe29
39 changed files with 311 additions and 242 deletions
Download patch file Download diff file Expand all files Collapse all files

2
arch/sparc/Kconfig
View file

@ -26,6 +26,7 @@ config SPARC
select ARCH_WANT_OPTIONAL_GPIOLIB
select RTC_CLASS
select RTC_DRV_M48T59
select HAVE_IRQ_WORK
select HAVE_PERF_EVENTS
select PERF_USE_VMALLOC
select HAVE_DMA_ATTRS
@ -54,6 +55,7 @@ config SPARC64
select RTC_DRV_BQ4802
select RTC_DRV_SUN4V
select RTC_DRV_STARFIRE
select HAVE_IRQ_WORK
select HAVE_PERF_EVENTS
select PERF_USE_VMALLOC

4
arch/sparc/include/asm/perf_event.h
View file

@ -1,10 +1,6 @@
#ifndef __ASM_SPARC_PERF_EVENT_H
#define __ASM_SPARC_PERF_EVENT_H
extern void set_perf_event_pending(void);
#define PERF_EVENT_INDEX_OFFSET 0
#ifdef CONFIG_PERF_EVENTS
#include <asm/ptrace.h>

8
arch/sparc/kernel/pcr.c
View file

@ -7,7 +7,7 @@
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/perf_event.h>
#include <linux/irq_work.h>
#include <linux/ftrace.h>
#include <asm/pil.h>
@ -43,14 +43,14 @@ void __irq_entry deferred_pcr_work_irq(int irq, struct pt_regs *regs)
old_regs = set_irq_regs(regs);
irq_enter();
#ifdef CONFIG_PERF_EVENTS
perf_event_do_pending();
#ifdef CONFIG_IRQ_WORK
irq_work_run();
#endif
irq_exit();
set_irq_regs(old_regs);
}
void set_perf_event_pending(void)
void arch_irq_work_raise(void)
{
set_softint(1 << PIL_DEFERRED_PCR_WORK);
}