| 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 | |
| 57 | |
