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

   1 From bc3a07e6c5149a82a22239a43e9f98514c2010d9 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 17/70] MIPS: make oprofile use cp0_perfcount_irq if it is set
   5
   6 The patch makes the oprofile code use the performance counters irq.
   7
   8 This patch is written by Felix Fietkau.
   9
  10 Signed-off-by: Felix Fietkau <nbd@openwrt.org>
  11 Signed-off-by: John Crispin <blogic@openwrt.org>
  12 ---
  13  arch/mips/oprofile/op_model_mipsxx.c |   12 ++++++++++++
  14  1 files changed, 12 insertions(+), 0 deletions(-)
  15
  16 diff --git a/arch/mips/oprofile/op_model_mipsxx.c b/arch/mips/oprofile/op_model_mipsxx.c
  17 index 54759f1..86cf234 100644
  18 --- a/arch/mips/oprofile/op_model_mipsxx.c
  19 +++ b/arch/mips/oprofile/op_model_mipsxx.c
  20 @@ -298,6 +298,11 @@ static void reset_counters(void *arg)
  21         }
  22  }
  23
  24 +static irqreturn_t mipsxx_perfcount_int(int irq, void *dev_id)
  25 +{
  26 +       return mipsxx_perfcount_handler();
  27 +}
  28 +
  29  static int __init mipsxx_init(void)
  30  {
  31         int counters;
  32 @@ -374,6 +379,10 @@ static int __init mipsxx_init(void)
  33         save_perf_irq = perf_irq;
  34         perf_irq = mipsxx_perfcount_handler;
  35
  36 +       if (cp0_perfcount_irq >= 0)
  37 +               return request_irq(cp0_perfcount_irq, mipsxx_perfcount_int,
  38 +                       IRQF_SHARED, "Perfcounter", save_perf_irq);
  39 +
  40         return 0;
  41  }
  42
  43 @@ -381,6 +390,9 @@ static void mipsxx_exit(void)
  44  {
  45         int counters = op_model_mipsxx_ops.num_counters;
  46
  47 +       if (cp0_perfcount_irq >= 0)
  48 +               free_irq(cp0_perfcount_irq, save_perf_irq);
  49 +
  50         counters = counters_per_cpu_to_total(counters);
  51         on_each_cpu(reset_counters, (void *)(long)counters, 1);
  52
  53 --
  54 1.7.7.1
  55