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Commit c9df1ce5 authored by Ian Campbell's avatar Ian Campbell Committed by Konrad Rzeszutek Wilk
Browse files

xen: events: add xen_allocate_irq_{dynamic, gsi} and xen_free_irq 



This is neater than open-coded calls to irq_alloc_desc_at and
irq_free_desc.

No intended behavioural change.

Note that we previously were not checking the return value of
irq_alloc_desc_at which would be failing for GSI<NR_IRQS_LEGACY
because the core architecture code has already allocated those for
us. Hence the additional check against NR_IRQS_LEGACY in
xen_allocate_irq_gsi.

Signed-off-by: default avatarIan Campbell <ian.campbell@citrix.com>
Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
parent cbf6aa89

drivers/xen/events.c

+35 −18
Original line number Diff line number Diff line
@@ -387,7 +387,7 @@ static int get_nr_hw_irqs(void) 
	return ret;

}



static int find_unbound_irq(void)

static int xen_allocate_irq_dynamic(void)

{

	struct irq_data *data;

	int irq, res;
@@ -436,6 +436,30 @@ static bool identity_mapped_irq(unsigned irq) 
	return irq < get_nr_hw_irqs();

}



static int xen_allocate_irq_gsi(unsigned gsi)

{

	int irq;



	if (!identity_mapped_irq(gsi) &&

	    (xen_initial_domain() || !xen_pv_domain()))

		return xen_allocate_irq_dynamic();



	/* Legacy IRQ descriptors are already allocated by the arch. */

	if (gsi < NR_IRQS_LEGACY)

		return gsi;



	irq = irq_alloc_desc_at(gsi, -1);

	if (irq < 0)

		panic("Unable to allocate to IRQ%d (%d)\n", gsi, irq);



	return irq;

}



static void xen_free_irq(unsigned irq)

{

	irq_free_desc(irq);

}



static void pirq_unmask_notify(int irq)

{

	struct physdev_eoi eoi = { .irq = pirq_from_irq(irq) };
@@ -621,14 +645,7 @@ int xen_map_pirq_gsi(unsigned pirq, unsigned gsi, int shareable, char *name) 
		goto out;	/* XXX need refcount? */

	}



	/* If we are a PV guest, we don't have GSIs (no ACPI passed). Therefore

	 * we are using the !xen_initial_domain() to drop in the function.*/

	if (identity_mapped_irq(gsi) || (!xen_initial_domain() &&

				xen_pv_domain())) {

		irq = gsi;

		irq_alloc_desc_at(irq, -1);

	} else

		irq = find_unbound_irq();

	irq = xen_allocate_irq_gsi(gsi);



	set_irq_chip_and_handler_name(irq, &xen_pirq_chip,

				      handle_level_irq, name);
@@ -641,7 +658,7 @@ int xen_map_pirq_gsi(unsigned pirq, unsigned gsi, int shareable, char *name) 
	 * this in the priv domain. */

	if (xen_initial_domain() &&

	    HYPERVISOR_physdev_op(PHYSDEVOP_alloc_irq_vector, &irq_op)) {

		irq_free_desc(irq);

		xen_free_irq(irq);

		irq = -ENOSPC;

		goto out;

	}
@@ -682,7 +699,7 @@ void xen_allocate_pirq_msi(char *name, int *irq, int *pirq, int alloc) 
	spin_lock(&irq_mapping_update_lock);



	if (alloc & XEN_ALLOC_IRQ) {

		*irq = find_unbound_irq();

		*irq = xen_allocate_irq_dynamic();

		if (*irq == -1)

			goto out;

	}
@@ -732,7 +749,7 @@ int xen_create_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc, int type) 


	spin_lock(&irq_mapping_update_lock);



	irq = find_unbound_irq();

	irq = xen_allocate_irq_dynamic();



	if (irq == -1)

		goto out;
@@ -741,7 +758,7 @@ int xen_create_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc, int type) 
	if (rc) {

		printk(KERN_WARNING "xen map irq failed %d\n", rc);



		irq_free_desc(irq);

		xen_free_irq(irq);



		irq = -1;

		goto out;
@@ -783,7 +800,7 @@ int xen_destroy_irq(int irq) 
	}

	irq_info[irq] = mk_unbound_info();



	irq_free_desc(irq);

	xen_free_irq(irq);



out:

	spin_unlock(&irq_mapping_update_lock);
@@ -814,7 +831,7 @@ int bind_evtchn_to_irq(unsigned int evtchn) 
	irq = evtchn_to_irq[evtchn];



	if (irq == -1) {

		irq = find_unbound_irq();

		irq = xen_allocate_irq_dynamic();



		set_irq_chip_and_handler_name(irq, &xen_dynamic_chip,

					      handle_fasteoi_irq, "event");
@@ -839,7 +856,7 @@ static int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu) 
	irq = per_cpu(ipi_to_irq, cpu)[ipi];



	if (irq == -1) {

		irq = find_unbound_irq();

		irq = xen_allocate_irq_dynamic();

		if (irq < 0)

			goto out;
@@ -875,7 +892,7 @@ int bind_virq_to_irq(unsigned int virq, unsigned int cpu) 
	irq = per_cpu(virq_to_irq, cpu)[virq];



	if (irq == -1) {

		irq = find_unbound_irq();

		irq = xen_allocate_irq_dynamic();



		set_irq_chip_and_handler_name(irq, &xen_percpu_chip,

					      handle_percpu_irq, "virq");
@@ -934,7 +951,7 @@ static void unbind_from_irq(unsigned int irq) 
	if (irq_info[irq].type != IRQT_UNBOUND) {

		irq_info[irq] = mk_unbound_info();



		irq_free_desc(irq);

		xen_free_irq(irq);

	}



	spin_unlock(&irq_mapping_update_lock);