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authorSuzuki K. Poulose <suzuki.poulose@arm.com>2015-03-18 15:24:42 +0300
committerWill Deacon <will.deacon@arm.com>2015-03-27 16:45:02 +0300
commit874c571414d5617f4042298986b6a826816ee885 (patch)
tree3098e8962b192f2669845b09fab68d553fa168f6 /drivers/bus
parentee8e5d5fbec0e880b18bbdbfe12de53ab1dec21f (diff)
downloadlinux-874c571414d5617f4042298986b6a826816ee885.tar.xz
arm-cci: Fix CCI PMU event validation
We mask the event with the CCI_PMU_EVENT_MASK, before passing the config to pmu_validate_hw_event(), which causes extra bits to be ignored and qualifies an invalid event code as valid. e.g, $ perf stat -a -C 0 -e CCI_400/config=0x1ff,name=cycles/ sleep 1 Performance counter stats for 'system wide': 506951142 cycles 1.013879626 seconds time elapsed where, cycles has an event coding of 0xff. This patch also removes the unnecessary 'event' mask in pmu_write_register, since the config_base is set by the pmu code after the event is validated. Acked-by: Punit Agrawal <punit.agrawal@arm.com> Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'drivers/bus')
-rw-r--r--drivers/bus/arm-cci.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/bus/arm-cci.c b/drivers/bus/arm-cci.c
index 054df84562c2..b854125e4831 100644
--- a/drivers/bus/arm-cci.c
+++ b/drivers/bus/arm-cci.c
@@ -81,7 +81,7 @@ static const struct of_device_id arm_cci_matches[] = {
#define CCI_PMU_CNTR_MASK ((1ULL << 32) -1)
-#define CCI_PMU_EVENT_MASK 0xff
+#define CCI_PMU_EVENT_MASK 0xffUL
#define CCI_PMU_EVENT_SOURCE(event) ((event >> 5) & 0x7)
#define CCI_PMU_EVENT_CODE(event) (event & 0x1f)
@@ -179,12 +179,15 @@ enum cci400_perf_events {
#define CCI_REV_R1_MASTER_PORT_MIN_EV 0x00
#define CCI_REV_R1_MASTER_PORT_MAX_EV 0x11
-static int pmu_validate_hw_event(u8 hw_event)
+static int pmu_validate_hw_event(unsigned long hw_event)
{
u8 ev_source = CCI_PMU_EVENT_SOURCE(hw_event);
u8 ev_code = CCI_PMU_EVENT_CODE(hw_event);
int if_type;
+ if (hw_event & ~CCI_PMU_EVENT_MASK)
+ return -ENOENT;
+
switch (ev_source) {
case CCI_PORT_S0:
case CCI_PORT_S1:
@@ -258,7 +261,6 @@ static void pmu_enable_counter(int idx)
static void pmu_set_event(int idx, unsigned long event)
{
- event &= CCI_PMU_EVENT_MASK;
pmu_write_register(event, idx, CCI_PMU_EVT_SEL);
}
@@ -275,7 +277,7 @@ static int pmu_get_event_idx(struct cci_pmu_hw_events *hw, struct perf_event *ev
{
struct cci_pmu *cci_pmu = to_cci_pmu(event->pmu);
struct hw_perf_event *hw_event = &event->hw;
- unsigned long cci_event = hw_event->config_base & CCI_PMU_EVENT_MASK;
+ unsigned long cci_event = hw_event->config_base;
int idx;
if (cci_event == CCI_PMU_CYCLES) {
@@ -296,7 +298,7 @@ static int pmu_get_event_idx(struct cci_pmu_hw_events *hw, struct perf_event *ev
static int pmu_map_event(struct perf_event *event)
{
int mapping;
- u8 config = event->attr.config & CCI_PMU_EVENT_MASK;
+ unsigned long config = event->attr.config;
if (event->attr.type < PERF_TYPE_MAX)
return -ENOENT;