From 934999185edd613ca80916d238ba7393b84ae53c Mon Sep 17 00:00:00 2001 From: Stephen Boyd Date: Sat, 28 Feb 2015 00:11:34 +0000 Subject: [PATCH] ARM: perf: Only reset PMxEVCNTCR registers on reset The Krait specific PMxEVCNTCR register is unpredictable upon reset. Currently we clear the register before we setup an event, but we don't need to do that. Instead, we can iterate through all the events and clear them once when we reset the PMU, saving a write in the event setup path. Cc: Neil Leeder Cc: Ashwin Chaugule Cc: Sheetal Sahasrabudhe Signed-off-by: Stephen Boyd Signed-off-by: Will Deacon --- arch/arm/kernel/perf_event_v7.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/arch/arm/kernel/perf_event_v7.c b/arch/arm/kernel/perf_event_v7.c index 97a7eda8831a..fae6c4ea52e8 100644 --- a/arch/arm/kernel/perf_event_v7.c +++ b/arch/arm/kernel/perf_event_v7.c @@ -1218,8 +1218,6 @@ static void krait_evt_setup(int idx, u32 config_base) val |= config_base & (ARMV7_EXCLUDE_USER | ARMV7_EXCLUDE_PL1); armv7_pmnc_write_evtsel(idx, val); - asm volatile("mcr p15, 0, %0, c9, c15, 0" : : "r" (0)); - if (venum_event) { venum_pre_pmresr(&vval, &fval); val = venum_read_pmresr(); @@ -1339,6 +1337,8 @@ static void krait_pmu_enable_event(struct perf_event *event) static void krait_pmu_reset(void *info) { u32 vval, fval; + struct arm_pmu *cpu_pmu = info; + u32 idx, nb_cnt = cpu_pmu->num_events; armv7pmu_reset(info); @@ -1350,6 +1350,13 @@ static void krait_pmu_reset(void *info) venum_pre_pmresr(&vval, &fval); venum_write_pmresr(0); venum_post_pmresr(vval, fval); + + /* Reset PMxEVNCTCR to sane default */ + for (idx = ARMV7_IDX_CYCLE_COUNTER; idx < nb_cnt; ++idx) { + armv7_pmnc_select_counter(idx); + asm volatile("mcr p15, 0, %0, c9, c15, 0" : : "r" (0)); + } + } static int krait_event_to_bit(struct perf_event *event, unsigned int region, -- 2.20.1