From c9df1ce585e3bb5a2f101c1d87381b285a9f962f Mon Sep 17 00:00:00 2001 From: Ian Campbell Date: Tue, 11 Jan 2011 17:20:15 +0000 Subject: 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 Signed-off-by: Konrad Rzeszutek Wilk Cc: Stefano Stabellini Cc: Jeremy Fitzhardinge --- drivers/xen/events.c | 53 ++++++++++++++++++++++++++++++++++------------------ 1 file changed, 35 insertions(+), 18 deletions(-) (limited to 'drivers/xen/events.c') diff --git a/drivers/xen/events.c b/drivers/xen/events.c index 1ae775742325..81a53eb6cd1d 100644 --- a/drivers/xen/events.c +++ b/drivers/xen/events.c @@ -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); -- cgit v1.2.3-55-g7522