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Commit 6ccecb0f authored by David Vrabel's avatar David Vrabel Committed by Konrad Rzeszutek Wilk
Browse files

xen/events: allow event channel priority to be set 



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: default avatarDavid Vrabel <david.vrabel@citrix.com>
Reviewed-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
parent bf2bbe07

drivers/xen/events/events_base.c

+17 −0
Original line number Diff line number Diff line
@@ -1117,6 +1117,23 @@ void unbind_from_irqhandler(unsigned int irq, void *dev_id) 
}

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 irq = get_evtchn_to_irq(evtchn);

include/xen/events.h

+5 −0
Original line number Diff line number Diff line
@@ -39,6 +39,11 @@ int bind_interdomain_evtchn_to_irqhandler(unsigned int remote_domain, 
 */

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

 */