diff options
| -rw-r--r-- | drivers/xen/events/events_base.c | 27 | ||||
| -rw-r--r-- | drivers/xen/events/events_internal.h | 3 |
2 files changed, 24 insertions, 6 deletions
diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c index cde096a6f11d..cc317739e786 100644 --- a/drivers/xen/events/events_base.c +++ b/drivers/xen/events/events_base.c @@ -461,17 +461,34 @@ static void lateeoi_list_add(struct irq_info *info) spin_unlock_irqrestore(&eoi->eoi_list_lock, flags); } -static void xen_irq_lateeoi_locked(struct irq_info *info) +static void xen_irq_lateeoi_locked(struct irq_info *info, bool spurious) { evtchn_port_t evtchn; unsigned int cpu; + unsigned int delay = 0; evtchn = info->evtchn; if (!VALID_EVTCHN(evtchn) || !list_empty(&info->eoi_list)) return; + if (spurious) { + if ((1 << info->spurious_cnt) < (HZ << 2)) + info->spurious_cnt++; + if (info->spurious_cnt > 1) { + delay = 1 << (info->spurious_cnt - 2); + if (delay > HZ) + delay = HZ; + if (!info->eoi_time) + info->eoi_cpu = smp_processor_id(); + info->eoi_time = get_jiffies_64() + delay; + } + } else { + info->spurious_cnt = 0; + } + cpu = info->eoi_cpu; - if (info->eoi_time && info->irq_epoch == per_cpu(irq_epoch, cpu)) { + if (info->eoi_time && + (info->irq_epoch == per_cpu(irq_epoch, cpu) || delay)) { lateeoi_list_add(info); return; } @@ -508,7 +525,7 @@ static void xen_irq_lateeoi_worker(struct work_struct *work) info->eoi_time = 0; - xen_irq_lateeoi_locked(info); + xen_irq_lateeoi_locked(info, false); } if (info) @@ -537,7 +554,7 @@ void xen_irq_lateeoi(unsigned int irq, unsigned int eoi_flags) info = info_for_irq(irq); if (info) - xen_irq_lateeoi_locked(info); + xen_irq_lateeoi_locked(info, eoi_flags & XEN_EOI_FLAG_SPURIOUS); read_unlock_irqrestore(&evtchn_rwlock, flags); } @@ -1441,7 +1458,7 @@ int evtchn_get(evtchn_port_t evtchn) goto done; err = -EINVAL; - if (info->refcnt <= 0) + if (info->refcnt <= 0 || info->refcnt == SHRT_MAX) goto done; info->refcnt++; diff --git a/drivers/xen/events/events_internal.h b/drivers/xen/events/events_internal.h index aac05cf52ced..82937d90d7d7 100644 --- a/drivers/xen/events/events_internal.h +++ b/drivers/xen/events/events_internal.h @@ -31,7 +31,8 @@ enum xen_irq_type { struct irq_info { struct list_head list; struct list_head eoi_list; - int refcnt; + short refcnt; + short spurious_cnt; enum xen_irq_type type; /* type */ unsigned irq; evtchn_port_t evtchn; /* event channel */ |