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xen/events: allow event channel priority to be set

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Add xen_irq_set_priority() to set an event channels priority.  This function
will only work with event channel ABIs that support priority (i.e., the
FIFO-based ABI).

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
This commit is contained in:
David Vrabel 2013-09-23 12:47:26 +01:00 • committed by Konrad Rzeszutek Wilk
parent bf2bbe07f1
commit 6ccecb0fbc
2 changed files with 22 additions and 0 deletions
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17
drivers/xen/events/events_base.c
View file

@ -1117,6 +1117,23 @@ void unbind_from_irqhandler(unsigned int irq, void *dev_id)
} }
EXPORT_SYMBOL_GPL(unbind_from_irqhandler); EXPORT_SYMBOL_GPL(unbind_from_irqhandler);
/**
* xen_set_irq_priority() - set an event channel priority.
* @irq:irq bound to an event channel.
* @priority: priority between XEN_IRQ_PRIORITY_MAX and XEN_IRQ_PRIORITY_MIN.
*/
int xen_set_irq_priority(unsigned irq, unsigned priority)
{
struct evtchn_set_priority set_priority;
set_priority.port = evtchn_from_irq(irq);
set_priority.priority = priority;
return HYPERVISOR_event_channel_op(EVTCHNOP_set_priority,
&set_priority);
}
EXPORT_SYMBOL_GPL(xen_set_irq_priority);
int evtchn_make_refcounted(unsigned int evtchn) int evtchn_make_refcounted(unsigned int evtchn)
{ {
int irq = get_evtchn_to_irq(evtchn); int irq = get_evtchn_to_irq(evtchn);

5
include/xen/events.h
View file

@ -39,6 +39,11 @@ int bind_interdomain_evtchn_to_irqhandler(unsigned int remote_domain,
*/ */
void unbind_from_irqhandler(unsigned int irq, void *dev_id); void unbind_from_irqhandler(unsigned int irq, void *dev_id);
#define XEN_IRQ_PRIORITY_MAX EVTCHN_FIFO_PRIORITY_MAX
#define XEN_IRQ_PRIORITY_DEFAULT EVTCHN_FIFO_PRIORITY_DEFAULT
#define XEN_IRQ_PRIORITY_MIN EVTCHN_FIFO_PRIORITY_MIN
int xen_set_irq_priority(unsigned irq, unsigned priority);
/* /*
* Allow extra references to event channels exposed to userspace by evtchn * Allow extra references to event channels exposed to userspace by evtchn
*/ */