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authorDavid S. Miller <davem@davemloft.net>2009-09-10 05:59:24 -0700
committerDavid S. Miller <davem@davemloft.net>2009-09-10 05:59:24 -0700
commit5686f9c3d67d5a20108fa26105c98b042df13123 (patch)
treecac519fa1a6e8cdcd90787753352b8930d2cfaab
parent2d0740c4562493b60f59ca9b0330a2d5e01d43ec (diff)
sparc64: Implement a real set_perf_counter_pending().
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>
-rw-r--r--arch/sparc/include/asm/perf_counter.h2
-rw-r--r--arch/sparc/kernel/pcr.c14
2 files changed, 14 insertions, 2 deletions
diff --git a/arch/sparc/include/asm/perf_counter.h b/arch/sparc/include/asm/perf_counter.h
index f07c587a830..38d64454643 100644
--- a/arch/sparc/include/asm/perf_counter.h
+++ b/arch/sparc/include/asm/perf_counter.h
@@ -1,7 +1,7 @@
#ifndef __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
diff --git a/arch/sparc/kernel/pcr.c b/arch/sparc/kernel/pcr.c
index 1ae8cdd7e70..68ff0010707 100644
--- a/arch/sparc/kernel/pcr.c
+++ b/arch/sparc/kernel/pcr.c
@@ -7,6 +7,8 @@
#include <linux/init.h>
#include <linux/irq.h>
+#include <linux/perf_counter.h>
+
#include <asm/pil.h>
#include <asm/pcr.h>
#include <asm/nmi.h>
@@ -34,10 +36,20 @@ unsigned int picl_shift;
*/
void deferred_pcr_work_irq(int irq, struct pt_regs *regs)
{
+ struct pt_regs *old_regs;
+
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);
}