static void ebs_overflow_handler(struct perf_event *event, struct perf_sample_data *data, struct pt_regs *regs)
#endif
{
unsigned int value, delta, cpu = smp_processor_id(), buftype = EVENT_BUF;
if (event != per_cpu(pevent, cpu))
return;
if (buffer_check_space(cpu, buftype, 5 * MAXSIZE_PACK32 + MAXSIZE_PACK64)) {
value = local64_read(&event->count);
delta = value - per_cpu(prev_value, cpu);
per_cpu(prev_value, cpu) = value;
// Counters header
gator_buffer_write_packed_int(cpu, buftype, MESSAGE_COUNTERS); // type
gator_buffer_write_packed_int64(cpu, buftype, gator_get_time()); // time
// Output counter
gator_buffer_write_packed_int(cpu, buftype, 2); // length
gator_buffer_write_packed_int(cpu, buftype, per_cpu(key, cpu)); // key
gator_buffer_write_packed_int(cpu, buftype, delta); // delta
// End Counters, length of zero
gator_buffer_write_packed_int(cpu, buftype, 0);
}
// Output backtrace
if (buffer_check_space(cpu, buftype, gator_backtrace_depth * 2 * MAXSIZE_PACK32))
gator_add_sample(cpu, buftype, regs);
// Check and commit; commit is set to occur once buffer is 3/4 full
buffer_check(cpu, buftype);
}
static void ebs_overflow_handler(struct perf_event *event, struct perf_sample_data *data, struct pt_regs *regs)
#endif
{
int cpu = smp_processor_id();
if (event != per_cpu(pevent_ebs, cpu))
return;
// Output backtrace
gator_add_sample(cpu, BACKTRACE_BUF, regs);
// Collect counters
collect_counters();
}
static irqreturn_t armv7_pmnc_interrupt(int irq, void *arg)
{
unsigned int cnt, cpu = smp_processor_id(), buftype = EVENT_BUF;
struct pt_regs * const regs = get_irq_regs();
u32 flags;
// Stop irq generation
armv7_pmnc_write(armv7_pmnc_read() & ~PMNC_E);
// Get and reset overflow status flags
flags = armv7_pmnc_reset_interrupt();
// Counters header
gator_buffer_write_packed_int(cpu, buftype, MESSAGE_COUNTERS); // type
gator_buffer_write_packed_int64(cpu, buftype, gator_get_time()); // time
// Cycle counter
if (flags & (1 << 31)) {
int value = armv7_ccnt_read(pmnc_count[CCNT]); // overrun
gator_buffer_write_packed_int(cpu, buftype, 2); // length
gator_buffer_write_packed_int(cpu, buftype, pmnc_key[CCNT]); // key
gator_buffer_write_packed_int(cpu, buftype, value); // value
}
// PMNC counters
for (cnt = CNT0; cnt < CNTMAX; cnt++) {
if (flags & (1 << (cnt - CNT0))) {
int value = armv7_cntn_read(cnt, pmnc_count[cnt]); // overrun
gator_buffer_write_packed_int(cpu, buftype, 2); // length
gator_buffer_write_packed_int(cpu, buftype, pmnc_key[cnt]); // key
gator_buffer_write_packed_int(cpu, buftype, value); // value
}
}
// End Counters, length of zero
gator_buffer_write_packed_int(cpu, buftype, 0);
// Output backtrace
gator_add_sample(cpu, buftype, regs);
// Check and commit; commit is set to occur once buffer is 3/4 full
event_buffer_check(cpu);
// Allow irq generation
armv7_pmnc_write(armv7_pmnc_read() | PMNC_E);
return IRQ_HANDLED;
}
