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arm-cci: Fix CCI PMU event validation

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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 <[email protected]>
Reviewed-by: Will Deacon <[email protected]>
Signed-off-by: Suzuki K. Poulose <[email protected]>
Signed-off-by: Will Deacon <[email protected]>
This commit is contained in:
Suzuki K. Poulose 2015-03-18 12:24:42 +00:00 • committed by Will Deacon
commit 874c571414
1 changed files with 7 additions and 5 deletions
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12
drivers/bus/arm-cci.c
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@ -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;