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authorWill Deacon <will.deacon@arm.com>2012-03-06 17:35:55 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-03-12 12:31:39 -0700
commit261d612b2edcb3e8b00ad990b6b81c71e4a5d108 (patch)
treeed194869f9a07a3c1b6b112d55c6bb0b9d47936d /arch/arm/kernel
parent288733a6065034d1870b02b164da0fb2d8452178 (diff)
ARM: 7357/1: perf: fix overflow handling for xscale2 PMUs
commit 3f31ae121348afd9ed39700ea2a63c17cd7eeed1 upstream. xscale2 PMUs indicate overflow not via the PMU control register, but by a separate overflow FLAG register instead. This patch fixes the xscale2 PMU code to use this register to detect to overflow and ensures that we clear any pending overflow when disabling a counter. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/arm/kernel')
-rw-r--r--arch/arm/kernel/perf_event_xscale.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/arch/arm/kernel/perf_event_xscale.c b/arch/arm/kernel/perf_event_xscale.c
index ea92c0cac10..9fc2c954af3 100644
--- a/arch/arm/kernel/perf_event_xscale.c
+++ b/arch/arm/kernel/perf_event_xscale.c
@@ -596,7 +596,7 @@ xscale2pmu_handle_irq(int irq_num, void *dev)
if (!event)
continue;
- if (!xscale2_pmnc_counter_has_overflowed(pmnc, idx))
+ if (!xscale2_pmnc_counter_has_overflowed(of_flags, idx))
continue;
hwc = &event->hw;
@@ -667,7 +667,7 @@ xscale2pmu_enable_event(struct hw_perf_event *hwc, int idx)
static void
xscale2pmu_disable_event(struct hw_perf_event *hwc, int idx)
{
- unsigned long flags, ien, evtsel;
+ unsigned long flags, ien, evtsel, of_flags;
struct pmu_hw_events *events = cpu_pmu->get_hw_events();
ien = xscale2pmu_read_int_enable();
@@ -676,26 +676,31 @@ xscale2pmu_disable_event(struct hw_perf_event *hwc, int idx)
switch (idx) {
case XSCALE_CYCLE_COUNTER:
ien &= ~XSCALE2_CCOUNT_INT_EN;
+ of_flags = XSCALE2_CCOUNT_OVERFLOW;
break;
case XSCALE_COUNTER0:
ien &= ~XSCALE2_COUNT0_INT_EN;
evtsel &= ~XSCALE2_COUNT0_EVT_MASK;
evtsel |= XSCALE_PERFCTR_UNUSED << XSCALE2_COUNT0_EVT_SHFT;
+ of_flags = XSCALE2_COUNT0_OVERFLOW;
break;
case XSCALE_COUNTER1:
ien &= ~XSCALE2_COUNT1_INT_EN;
evtsel &= ~XSCALE2_COUNT1_EVT_MASK;
evtsel |= XSCALE_PERFCTR_UNUSED << XSCALE2_COUNT1_EVT_SHFT;
+ of_flags = XSCALE2_COUNT1_OVERFLOW;
break;
case XSCALE_COUNTER2:
ien &= ~XSCALE2_COUNT2_INT_EN;
evtsel &= ~XSCALE2_COUNT2_EVT_MASK;
evtsel |= XSCALE_PERFCTR_UNUSED << XSCALE2_COUNT2_EVT_SHFT;
+ of_flags = XSCALE2_COUNT2_OVERFLOW;
break;
case XSCALE_COUNTER3:
ien &= ~XSCALE2_COUNT3_INT_EN;
evtsel &= ~XSCALE2_COUNT3_EVT_MASK;
evtsel |= XSCALE_PERFCTR_UNUSED << XSCALE2_COUNT3_EVT_SHFT;
+ of_flags = XSCALE2_COUNT3_OVERFLOW;
break;
default:
WARN_ONCE(1, "invalid counter number (%d)\n", idx);
@@ -705,6 +710,7 @@ xscale2pmu_disable_event(struct hw_perf_event *hwc, int idx)
raw_spin_lock_irqsave(&events->pmu_lock, flags);
xscale2pmu_write_event_select(evtsel);
xscale2pmu_write_int_enable(ien);
+ xscale2pmu_write_overflow_flags(of_flags);
raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
}