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authorPawel Moll <pawel.moll@arm.com>2014-09-15 18:33:48 +0400
committerArnd Bergmann <arnd@arndb.de>2014-10-08 23:31:14 +0400
commitfa637bf0595ee1796d728a0d33b6b7fff12e1f3d (patch)
tree23c0b97702221f298787f755ec7f6a8f3ac7b20c /drivers/bus
parent741c798a0229c9523c1f68bc8c83a79fefad4333 (diff)
downloadlinux-fa637bf0595ee1796d728a0d33b6b7fff12e1f3d.tar.xz
bus: arm-ccn: Fix spurious warning message
Because CCN's cycle counter always runs, it will generate an interrupt on overflow even if the relevant perf event was not requested, causing a spurious warning message. Fixed now by warning on only normal counter unwanted overflows. Also cleaning the overflow mask at init now, not to warn on event previously requested by firmware. Signed-off-by: Pawel Moll <pawel.moll@arm.com> Signed-off-by: Olof Johansson <olof@lixom.net> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'drivers/bus')
-rw-r--r--drivers/bus/arm-ccn.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/bus/arm-ccn.c b/drivers/bus/arm-ccn.c
index 6f550d9e7a2d..f5bca3113bfc 100644
--- a/drivers/bus/arm-ccn.c
+++ b/drivers/bus/arm-ccn.c
@@ -57,6 +57,7 @@
#define CCN_DT_PMCCNTRSR 0x0190
#define CCN_DT_PMOVSR 0x0198
#define CCN_DT_PMOVSR_CLR 0x01a0
+#define CCN_DT_PMOVSR_CLR__MASK 0x1f
#define CCN_DT_PMCR 0x01a8
#define CCN_DT_PMCR__OVFL_INTR_EN (1 << 6)
#define CCN_DT_PMCR__PMU_EN (1 << 0)
@@ -1052,7 +1053,8 @@ static irqreturn_t arm_ccn_pmu_overflow_handler(struct arm_ccn_dt *dt)
struct perf_event *event = dt->pmu_counters[idx].event;
int overflowed = pmovsr & BIT(idx);
- WARN_ON_ONCE(overflowed && !event);
+ WARN_ON_ONCE(overflowed && !event &&
+ idx != CCN_IDX_PMU_CYCLE_COUNTER);
if (!event || !overflowed)
continue;
@@ -1088,6 +1090,7 @@ static int arm_ccn_pmu_init(struct arm_ccn *ccn)
/* Initialize DT subsystem */
ccn->dt.base = ccn->base + CCN_REGION_SIZE;
spin_lock_init(&ccn->dt.config_lock);
+ writel(CCN_DT_PMOVSR_CLR__MASK, ccn->dt.base + CCN_DT_PMOVSR_CLR);
writel(CCN_DT_CTL__DT_EN, ccn->dt.base + CCN_DT_CTL);
writel(CCN_DT_PMCR__OVFL_INTR_EN | CCN_DT_PMCR__PMU_EN,
ccn->dt.base + CCN_DT_PMCR);