target/linux/lantiq/patches-3.0/0009-MIPS-make-oprofile-use-cp0_perfcount_irq-if-it-is-se.patch

   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
   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 Cc: linux-mips@linux-mips.org
  13 ---
  14  arch/mips/oprofile/op_model_mipsxx.c |   12 ++++++++++++
  15  1 files changed, 12 insertions(+), 0 deletions(-)
  16
  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)
  22         }
  23  }
  24
  25 +static irqreturn_t mipsxx_perfcount_int(int irq, void *dev_id)
  26 +{
  27 +       return mipsxx_perfcount_handler();
  28 +}
  29 +
  30  static int __init mipsxx_init(void)
  31  {
  32         int counters;
  33 @@ -374,6 +379,10 @@ static int __init mipsxx_init(void)
  34         save_perf_irq = perf_irq;
  35         perf_irq = mipsxx_perfcount_handler;
  36
  37 +       if (cp0_perfcount_irq >= 0)
  38 +               return request_irq(cp0_perfcount_irq, mipsxx_perfcount_int,
  39 +                       IRQF_SHARED, "Perfcounter", save_perf_irq);
  40 +
  41         return 0;
  42  }
  43
  44 @@ -381,6 +390,9 @@ static void mipsxx_exit(void)
  45  {
  46         int counters = op_model_mipsxx_ops.num_counters;
  47
  48 +       if (cp0_perfcount_irq >= 0)
  49 +               free_irq(cp0_perfcount_irq, save_perf_irq);
  50 +
  51         counters = counters_per_cpu_to_total(counters);
  52         on_each_cpu(reset_counters, (void *)(long)counters, 1);
  53
  54 --
  55 1.7.5.4
  56