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sparc64: Implement a real set_perf_counter_pending().

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When the perf counter subsystem needs to reschedule work out
from an NMI, it invokes set_perf_counter_pending().

This triggers a non-NMI irq which should invoke
perf_counter_do_pending().

Currently this won't trigger because sparc64 won't trigger
the perf counter subsystem from NMIs, but when the HW counter
support is added it will.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2009-09-10 05:59:24 -07:00
parent 2d0740c456
commit 5686f9c3d6
2 changed files with 14 additions and 2 deletions
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2
arch/sparc/include/asm/perf_counter.h
View File

@ -1,7 +1,7 @@
#ifndef __ASM_SPARC_PERF_COUNTER_H #ifndef __ASM_SPARC_PERF_COUNTER_H
#define __ASM_SPARC_PERF_COUNTER_H #define __ASM_SPARC_PERF_COUNTER_H
static inline void set_perf_counter_pending(void) { } extern void set_perf_counter_pending(void);
#define PERF_COUNTER_INDEX_OFFSET 0 #define PERF_COUNTER_INDEX_OFFSET 0

14
arch/sparc/kernel/pcr.c
View File

@ -7,6 +7,8 @@
#include <linux/init.h> #include <linux/init.h>
#include <linux/irq.h> #include <linux/irq.h>
#include <linux/perf_counter.h>
#include <asm/pil.h> #include <asm/pil.h>
#include <asm/pcr.h> #include <asm/pcr.h>
#include <asm/nmi.h> #include <asm/nmi.h>
@ -34,10 +36,20 @@ unsigned int picl_shift;
*/ */
void deferred_pcr_work_irq(int irq, struct pt_regs *regs) void deferred_pcr_work_irq(int irq, struct pt_regs *regs)
{ {
struct pt_regs *old_regs;
clear_softint(1 << PIL_DEFERRED_PCR_WORK); clear_softint(1 << PIL_DEFERRED_PCR_WORK);
old_regs = set_irq_regs(regs);
irq_enter();
#ifdef CONFIG_PERF_COUNTERS
perf_counter_do_pending();
#endif
irq_exit();
set_irq_regs(old_regs);
} }
void schedule_deferred_pcr_work(void) void set_perf_counter_pending(void)
{ {
set_softint(1 << PIL_DEFERRED_PCR_WORK); set_softint(1 << PIL_DEFERRED_PCR_WORK);
} }