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perf: accumulate counter in overflow handler

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Change-Id: If5f5a913e0fde889d1835ffb16c19ea0ad5e685a
This commit is contained in:
TOIDA,Suguru
2019-11-20 11:59:52 +09:00
parent 606db376fd
commit 305511b48f
1 changed files with 32 additions and 23 deletions
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55
arch/arm64/kernel/perfctr_armv8pmu.c
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@ -491,6 +491,11 @@ static inline int armv8pmu_has_overflowed(uint32_t pmovsr)
return pmovsr & ARMV8_PMU_OVERFLOWED_MASK;
}
static inline int armv8pmu_counter_has_overflowed(uint32_t pmnc, int idx)
{
return pmnc & BIT(idx);
}
/* @ref.impl linux-v4.15-rc3 arch/arm64/kernel/perf_event.c */
static int __armv8_pmuv3_map_event(uint32_t type, uint64_t config,
const unsigned int (*extra_event_map)
@ -781,14 +786,11 @@ static uint32_t armv8pmu_read_num_pmnc_events(void)
static void armv8pmu_handle_irq(void *priv)
{
struct siginfo info;
uint32_t pmovsr;
struct thread *thread = cpu_local_var(current);
struct process *proc = thread->proc;
long irqstate;
struct mckfd *fdp;
struct pt_regs *regs = (struct pt_regs *)priv;
struct mc_perf_event *event = NULL;
const struct per_cpu_arm_pmu *cpu_pmu = get_per_cpu_pmu();
int idx;
/*
* Get and reset the IRQ flags
@ -801,29 +803,36 @@ static void armv8pmu_handle_irq(void *priv)
if (!armv8pmu_has_overflowed(pmovsr))
return;
if (!proc->monitoring_event) {
return;
}
/*
* Handle the counter(s) overflow(s)
*/
/* same as x86_64 mckernel */
irqstate = ihk_mc_spinlock_lock(&proc->mckfd_lock);
for (fdp = proc->mckfd; fdp; fdp = fdp->next) {
if (fdp->sig_no > 0)
break;
}
ihk_mc_spinlock_unlock(&proc->mckfd_lock, irqstate);
for (idx = 0; idx < cpu_pmu->num_events; idx++) {
struct mc_perf_event *event = NULL;
struct mc_perf_event *sub;
if (fdp) {
memset(&info, '\0', sizeof(info));
info.si_signo = fdp->sig_no;
info._sifields._sigfault.si_addr = (void *)regs->pc;
info._sifields._sigpoll.si_fd = fdp->fd;
set_signal(fdp->sig_no, regs, &info);
}
else {
set_signal(SIGIO, regs, NULL);
}
if (!armv8pmu_counter_has_overflowed(pmovsr, idx)) {
continue;
}
if (event) {
if (proc->monitoring_event->counter_id == idx) {
event = proc->monitoring_event;
} else {
list_for_each_entry(sub,
&proc->monitoring_event->sibling_list,
group_entry) {
if (sub->counter_id == idx) {
event = sub;
break;
}
}
}
if (!event) {
continue;
}
ihk_mc_event_update(event);
ihk_mc_event_set_period(event);
}