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Commit d9a8814f authored by Konrad Rzeszutek Wilk's avatar Konrad Rzeszutek Wilk
Browse files

xen: Provide a variant of xen_poll_irq with timeout. 



The 'xen_poll_irq_timeout' provides a method to pass in
the poll timeout for IRQs if requested. We also export
those two poll functions as Xen PCI fronted uses them.

Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: default avatarJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
parent 3a69e916

drivers/xen/events.c

+12 −5
Original line number Diff line number Diff line
@@ -1139,7 +1139,7 @@ void xen_clear_irq_pending(int irq) 
	if (VALID_EVTCHN(evtchn))

		clear_evtchn(evtchn);

}



EXPORT_SYMBOL(xen_clear_irq_pending);

void xen_set_irq_pending(int irq)

{

	int evtchn = evtchn_from_irq(irq);
@@ -1159,9 +1159,9 @@ bool xen_test_irq_pending(int irq) 
	return ret;

}



/* Poll waiting for an irq to become pending.  In the usual case, the

   irq will be disabled so it won't deliver an interrupt. */

void xen_poll_irq(int irq)

/* Poll waiting for an irq to become pending with timeout.  In the usual case,

 * the irq will be disabled so it won't deliver an interrupt. */

void xen_poll_irq_timeout(int irq, u64 timeout)

{

	evtchn_port_t evtchn = evtchn_from_irq(irq);
@@ -1169,13 +1169,20 @@ void xen_poll_irq(int irq) 
		struct sched_poll poll;



		poll.nr_ports = 1;

		poll.timeout = 0;

		poll.timeout = timeout;

		set_xen_guest_handle(poll.ports, &evtchn);



		if (HYPERVISOR_sched_op(SCHEDOP_poll, &poll) != 0)

			BUG();

	}

}

EXPORT_SYMBOL(xen_poll_irq_timeout);

/* Poll waiting for an irq to become pending.  In the usual case, the

 * irq will be disabled so it won't deliver an interrupt. */

void xen_poll_irq(int irq)

{

	xen_poll_irq_timeout(irq, 0 /* no timeout */);

}



void xen_irq_resume(void)

{

include/xen/events.h

+4 −0
Original line number Diff line number Diff line
@@ -53,6 +53,10 @@ bool xen_test_irq_pending(int irq); 
   irq will be disabled so it won't deliver an interrupt. */

void xen_poll_irq(int irq);



/* Poll waiting for an irq to become pending with a timeout.  In the usual case,

 * the irq will be disabled so it won't deliver an interrupt. */

void xen_poll_irq_timeout(int irq, u64 timeout);



/* Determine the IRQ which is bound to an event channel */

unsigned irq_from_evtchn(unsigned int evtchn);