1 From 88bb1794592e3fe9c8d65ce73ee851e11dbbd26b Mon Sep 17 00:00:00 2001
2 From: John Crispin <blogic@openwrt.org>
3 Date: Wed, 24 Aug 2011 13:24:11 +0200
4 Subject: [PATCH 09/24] MIPS: make oprofile use cp0_perfcount_irq if it is set
6 The patch makes the oprofile code use the performance counters irq.
8 This patch is written by Felix Fietkau.
10 Signed-off-by: Felix Fietkau <nbd@openwrt.org>
11 Signed-off-by: John Crispin <blogic@openwrt.org>
12 Cc: linux-mips@linux-mips.org
14 arch/mips/oprofile/op_model_mipsxx.c | 12 ++++++++++++
15 1 files changed, 12 insertions(+), 0 deletions(-)
17 diff --git a/arch/mips/oprofile/op_model_mipsxx.c b/arch/mips/oprofile/op_model_mipsxx.c
18 index 54759f1..86cf234 100644
19 --- a/arch/mips/oprofile/op_model_mipsxx.c
20 +++ b/arch/mips/oprofile/op_model_mipsxx.c
21 @@ -298,6 +298,11 @@ static void reset_counters(void *arg)
25 +static irqreturn_t mipsxx_perfcount_int(int irq, void *dev_id)
27 + return mipsxx_perfcount_handler();
30 static int __init mipsxx_init(void)
33 @@ -374,6 +379,10 @@ static int __init mipsxx_init(void)
34 save_perf_irq = perf_irq;
35 perf_irq = mipsxx_perfcount_handler;
37 + if (cp0_perfcount_irq >= 0)
38 + return request_irq(cp0_perfcount_irq, mipsxx_perfcount_int,
39 + IRQF_SHARED, "Perfcounter", save_perf_irq);
44 @@ -381,6 +390,9 @@ static void mipsxx_exit(void)
46 int counters = op_model_mipsxx_ops.num_counters;
48 + if (cp0_perfcount_irq >= 0)
49 + free_irq(cp0_perfcount_irq, save_perf_irq);
51 counters = counters_per_cpu_to_total(counters);
52 on_each_cpu(reset_counters, (void *)(long)counters, 1);