openwrt-xburst/target/linux/lantiq/patches-3.2/0017-MIPS-make-oprofile-use-cp0_perfcount_irq-if-it-is-se.patch

From bc3a07e6c5149a82a22239a43e9f98514c2010d9 Mon Sep 17 00:00:00 2001
From: John Crispin <blogic@openwrt.org>
Date: Wed, 24 Aug 2011 13:24:11 +0200
Subject: [PATCH 17/70] MIPS: make oprofile use cp0_perfcount_irq if it is set

The patch makes the oprofile code use the performance counters irq.

This patch is written by Felix Fietkau.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John Crispin <blogic@openwrt.org>
---
 arch/mips/oprofile/op_model_mipsxx.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/arch/mips/oprofile/op_model_mipsxx.c b/arch/mips/oprofile/op_model_mipsxx.c
index 54759f1..86cf234 100644
--- a/arch/mips/oprofile/op_model_mipsxx.c
+++ b/arch/mips/oprofile/op_model_mipsxx.c
@@ -298,6 +298,11 @@ static void reset_counters(void *arg)
 	}
 }
 
+static irqreturn_t mipsxx_perfcount_int(int irq, void *dev_id)
+{
+	return mipsxx_perfcount_handler();
+}
+
 static int __init mipsxx_init(void)
 {
 	int counters;
@@ -374,6 +379,10 @@ static int __init mipsxx_init(void)
 	save_perf_irq = perf_irq;
 	perf_irq = mipsxx_perfcount_handler;
 
+	if (cp0_perfcount_irq >= 0)
+		return request_irq(cp0_perfcount_irq, mipsxx_perfcount_int,
+			IRQF_SHARED, "Perfcounter", save_perf_irq);
+
 	return 0;
 }
 
@@ -381,6 +390,9 @@ static void mipsxx_exit(void)
 {
 	int counters = op_model_mipsxx_ops.num_counters;
 
+	if (cp0_perfcount_irq >= 0)
+		free_irq(cp0_perfcount_irq, save_perf_irq);
+
 	counters = counters_per_cpu_to_total(counters);
 	on_each_cpu(reset_counters, (void *)(long)counters, 1);
 
-- 
1.7.7.1