[PATCH V3 01/14] MIPS: make oprofile use cp0_perfcount_irq if it is set

[John Crispin <blogic@openwrt.org>]

From: Felix Fietkau <nbd@openwrt.org>

Make the oprofile code use the performance counters irq.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John Crispin <blogic@openwrt.org>

---
Changes in V2
* set Author to Felix

Changes in V3
* remove IRQF_SHARED
* make sure cp0_compare_irq != cp0_perfcount_irq

 arch/mips/kernel/perf_event_mipsxx.c |    3 ++-
 arch/mips/oprofile/op_model_mipsxx.c |   12 ++++++++++++
 2 files changed, 14 insertions(+), 1 deletions(-)

diff --git a/arch/mips/kernel/perf_event_mipsxx.c 
b/arch/mips/kernel/perf_event_mipsxx.c
index 811084f..574b4e9 100644
--- a/arch/mips/kernel/perf_event_mipsxx.c
+++ b/arch/mips/kernel/perf_event_mipsxx.c
@@ -1532,7 +1532,8 @@ init_hw_perf_events(void)
                irq = MSC01E_INT_BASE + MSC01E_INT_PERFCTR;
        } else {
 #endif
-               if (cp0_perfcount_irq >= 0)
+               if ((cp0_perfcount_irq >= 0) &&
+                               (cp0_compare_irq != cp0_perfcount_irq))
                        irq = MIPS_CPU_IRQ_BASE + cp0_perfcount_irq;
                else
                        irq = -1;
diff --git a/arch/mips/oprofile/op_model_mipsxx.c 
b/arch/mips/oprofile/op_model_mipsxx.c
index 54759f1..baba3bc 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) && (cp0_compare_irq != cp0_perfcount_irq))
+               return request_irq(cp0_perfcount_irq, mipsxx_perfcount_int,
+                       0, "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) && (cp0_compare_irq != cp0_perfcount_irq))
+               free_irq(cp0_perfcount_irq, save_perf_irq);
+
        counters = counters_per_cpu_to_total(counters);
        on_each_cpu(reset_counters, (void *)(long)counters, 1);
 
-- 
1.7.9.1