static inline u32 armv8pmu_read_counter(struct perf_event *event)
{
struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
struct hw_perf_event *hwc = &event->hw;
int idx = hwc->idx;
u32 value = 0;
if (!armv8pmu_counter_valid(cpu_pmu, idx))
pr_err("CPU%u reading wrong counter %d\n",
smp_processor_id(), idx);
else if (idx == ARMV8_IDX_CYCLE_COUNTER)
value = read_sysreg(pmccntr_el0);
else if (armv8pmu_select_counter(idx) == idx)
value = read_sysreg(pmxevcntr_el0);
return value;
}
static inline void armv8pmu_write_counter(struct perf_event *event, u32 value)
{
struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
struct hw_perf_event *hwc = &event->hw;
int idx = hwc->idx;
if (!armv8pmu_counter_valid(cpu_pmu, idx))
pr_err("CPU%u writing wrong counter %d\n",
smp_processor_id(), idx);
else if (idx == ARMV8_IDX_CYCLE_COUNTER) {
/*
* Set the upper 32bits as this is a 64bit counter but we only
* count using the lower 32bits and we want an interrupt when
* it overflows.
*/
u64 value64 = 0xffffffff00000000ULL | value;
write_sysreg(value64, pmccntr_el0);
} else if (armv8pmu_select_counter(idx) == idx)
write_sysreg(value, pmxevcntr_el0);
}
static inline void armv8pmu_write_counter(struct perf_event *event, u64 value)
{
struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
struct hw_perf_event *hwc = &event->hw;
int idx = hwc->idx;
if (!armv8pmu_counter_valid(cpu_pmu, idx))
pr_err("CPU%u writing wrong counter %d\n",
smp_processor_id(), idx);
else if (idx == ARMV8_IDX_CYCLE_COUNTER) {
/*
* The cycles counter is really a 64-bit counter.
* When treating it as a 32-bit counter, we only count
* the lower 32 bits, and set the upper 32-bits so that
* we get an interrupt upon 32-bit overflow.
*/
if (!armv8pmu_event_is_64bit(event))
value |= 0xffffffff00000000ULL;
write_sysreg(value, pmccntr_el0);
} else
armv8pmu_write_hw_counter(event, value);
}
