xen/events: move drivers/xen/events.c into drivers/xen/events/

events.c will be split into multiple files so move it into its own
directory.

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>

1 files changed, 0 insertions, 1908 deletions

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
deleted file mode 100644
index fec5da4ff3a0..000000000000
--- a/drivers/xen/events.c
+++ /dev/null
@@ -1,1908 +0,0 @@
-/*
- * Xen event channels
- *
- * Xen models interrupts with abstract event channels.  Because each
- * domain gets 1024 event channels, but NR_IRQ is not that large, we
- * must dynamically map irqs<->event channels.  The event channels
- * interface with the rest of the kernel by defining a xen interrupt
- * chip.  When an event is received, it is mapped to an irq and sent
- * through the normal interrupt processing path.
- *
- * There are four kinds of events which can be mapped to an event
- * channel:
- *
- * 1. Inter-domain notifications.  This includes all the virtual
- *    device events, since they're driven by front-ends in another domain
- *    (typically dom0).
- * 2. VIRQs, typically used for timers.  These are per-cpu events.
- * 3. IPIs.
- * 4. PIRQs - Hardware interrupts.
- *
- * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
- */
-
-#define pr_fmt(fmt) "xen:" KBUILD_MODNAME ": " fmt
-
-#include <linux/linkage.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/module.h>
-#include <linux/string.h>
-#include <linux/bootmem.h>
-#include <linux/slab.h>
-#include <linux/irqnr.h>
-#include <linux/pci.h>
-
-#ifdef CONFIG_X86
-#include <asm/desc.h>
-#include <asm/ptrace.h>
-#include <asm/irq.h>
-#include <asm/idle.h>
-#include <asm/io_apic.h>
-#include <asm/xen/page.h>
-#include <asm/xen/pci.h>
-#endif
-#include <asm/sync_bitops.h>
-#include <asm/xen/hypercall.h>
-#include <asm/xen/hypervisor.h>
-
-#include <xen/xen.h>
-#include <xen/hvm.h>
-#include <xen/xen-ops.h>
-#include <xen/events.h>
-#include <xen/interface/xen.h>
-#include <xen/interface/event_channel.h>
-#include <xen/interface/hvm/hvm_op.h>
-#include <xen/interface/hvm/params.h>
-#include <xen/interface/physdev.h>
-#include <xen/interface/sched.h>
-#include <xen/interface/vcpu.h>
-#include <asm/hw_irq.h>
-
-/*
- * This lock protects updates to the following mapping and reference-count
- * arrays. The lock does not need to be acquired to read the mapping tables.
- */
-static DEFINE_MUTEX(irq_mapping_update_lock);
-
-static LIST_HEAD(xen_irq_list_head);
-
-/* IRQ <-> VIRQ mapping. */
-static DEFINE_PER_CPU(int [NR_VIRQS], virq_to_irq) = {[0 ... NR_VIRQS-1] = -1};
-
-/* IRQ <-> IPI mapping */
-static DEFINE_PER_CPU(int [XEN_NR_IPIS], ipi_to_irq) = {[0 ... XEN_NR_IPIS-1] = -1};
-
-/* Interrupt types. */
-enum xen_irq_type {
-	IRQT_UNBOUND = 0,
-	IRQT_PIRQ,
-	IRQT_VIRQ,
-	IRQT_IPI,
-	IRQT_EVTCHN
-};
-
-/*
- * Packed IRQ information:
- * type - enum xen_irq_type
- * event channel - irq->event channel mapping
- * cpu - cpu this event channel is bound to
- * index - type-specific information:
- *    PIRQ - physical IRQ, GSI, flags, and owner domain
- *    VIRQ - virq number
- *    IPI - IPI vector
- *    EVTCHN -
- */
-struct irq_info {
-	struct list_head list;
-	int refcnt;
-	enum xen_irq_type type;	/* type */
-	unsigned irq;
-	unsigned short evtchn;	/* event channel */
-	unsigned short cpu;	/* cpu bound */
-
-	union {
-		unsigned short virq;
-		enum ipi_vector ipi;
-		struct {
-			unsigned short pirq;
-			unsigned short gsi;
-			unsigned char flags;
-			uint16_t domid;
-		} pirq;
-	} u;
-};
-#define PIRQ_NEEDS_EOI	(1 << 0)
-#define PIRQ_SHAREABLE	(1 << 1)
-
-static int *evtchn_to_irq;
-#ifdef CONFIG_X86
-static unsigned long *pirq_eoi_map;
-#endif
-static bool (*pirq_needs_eoi)(unsigned irq);
-
-/*
- * Note sizeof(xen_ulong_t) can be more than sizeof(unsigned long). Be
- * careful to only use bitops which allow for this (e.g
- * test_bit/find_first_bit and friends but not __ffs) and to pass
- * BITS_PER_EVTCHN_WORD as the bitmask length.
- */
-#define BITS_PER_EVTCHN_WORD (sizeof(xen_ulong_t)*8)
-/*
- * Make a bitmask (i.e. unsigned long *) of a xen_ulong_t
- * array. Primarily to avoid long lines (hence the terse name).
- */
-#define BM(x) (unsigned long *)(x)
-/* Find the first set bit in a evtchn mask */
-#define EVTCHN_FIRST_BIT(w) find_first_bit(BM(&(w)), BITS_PER_EVTCHN_WORD)
-
-static DEFINE_PER_CPU(xen_ulong_t [NR_EVENT_CHANNELS/BITS_PER_EVTCHN_WORD],
-		      cpu_evtchn_mask);
-
-/* Xen will never allocate port zero for any purpose. */
-#define VALID_EVTCHN(chn)	((chn) != 0)
-
-static struct irq_chip xen_dynamic_chip;
-static struct irq_chip xen_percpu_chip;
-static struct irq_chip xen_pirq_chip;
-static void enable_dynirq(struct irq_data *data);
-static void disable_dynirq(struct irq_data *data);
-
-/* Get info for IRQ */
-static struct irq_info *info_for_irq(unsigned irq)
-{
-	return irq_get_handler_data(irq);
-}
-
-/* Constructors for packed IRQ information. */
-static void xen_irq_info_common_init(struct irq_info *info,
-				     unsigned irq,
-				     enum xen_irq_type type,
-				     unsigned short evtchn,
-				     unsigned short cpu)
-{
-
-	BUG_ON(info->type != IRQT_UNBOUND && info->type != type);
-
-	info->type = type;
-	info->irq = irq;
-	info->evtchn = evtchn;
-	info->cpu = cpu;
-
-	evtchn_to_irq[evtchn] = irq;
-
-	irq_clear_status_flags(irq, IRQ_NOREQUEST|IRQ_NOAUTOEN);
-}
-
-static void xen_irq_info_evtchn_init(unsigned irq,
-				     unsigned short evtchn)
-{
-	struct irq_info *info = info_for_irq(irq);
-
-	xen_irq_info_common_init(info, irq, IRQT_EVTCHN, evtchn, 0);
-}
-
-static void xen_irq_info_ipi_init(unsigned cpu,
-				  unsigned irq,
-				  unsigned short evtchn,
-				  enum ipi_vector ipi)
-{
-	struct irq_info *info = info_for_irq(irq);
-
-	xen_irq_info_common_init(info, irq, IRQT_IPI, evtchn, 0);
-
-	info->u.ipi = ipi;
-
-	per_cpu(ipi_to_irq, cpu)[ipi] = irq;
-}
-
-static void xen_irq_info_virq_init(unsigned cpu,
-				   unsigned irq,
-				   unsigned short evtchn,
-				   unsigned short virq)
-{
-	struct irq_info *info = info_for_irq(irq);
-
-	xen_irq_info_common_init(info, irq, IRQT_VIRQ, evtchn, 0);
-
-	info->u.virq = virq;
-
-	per_cpu(virq_to_irq, cpu)[virq] = irq;
-}
-
-static void xen_irq_info_pirq_init(unsigned irq,
-				   unsigned short evtchn,
-				   unsigned short pirq,
-				   unsigned short gsi,
-				   uint16_t domid,
-				   unsigned char flags)
-{
-	struct irq_info *info = info_for_irq(irq);
-
-	xen_irq_info_common_init(info, irq, IRQT_PIRQ, evtchn, 0);
-
-	info->u.pirq.pirq = pirq;
-	info->u.pirq.gsi = gsi;
-	info->u.pirq.domid = domid;
-	info->u.pirq.flags = flags;
-}
-
-/*
- * Accessors for packed IRQ information.
- */
-static unsigned int evtchn_from_irq(unsigned irq)
-{
-	if (unlikely(WARN(irq < 0 || irq >= nr_irqs, "Invalid irq %d!\n", irq)))
-		return 0;
-
-	return info_for_irq(irq)->evtchn;
-}
-
-unsigned irq_from_evtchn(unsigned int evtchn)
-{
-	return evtchn_to_irq[evtchn];
-}
-EXPORT_SYMBOL_GPL(irq_from_evtchn);
-
-static enum ipi_vector ipi_from_irq(unsigned irq)
-{
-	struct irq_info *info = info_for_irq(irq);
-
-	BUG_ON(info == NULL);
-	BUG_ON(info->type != IRQT_IPI);
-
-	return info->u.ipi;
-}
-
-static unsigned virq_from_irq(unsigned irq)
-{
-	struct irq_info *info = info_for_irq(irq);
-
-	BUG_ON(info == NULL);
-	BUG_ON(info->type != IRQT_VIRQ);
-
-	return info->u.virq;
-}
-
-static unsigned pirq_from_irq(unsigned irq)
-{
-	struct irq_info *info = info_for_irq(irq);
-
-	BUG_ON(info == NULL);
-	BUG_ON(info->type != IRQT_PIRQ);
-
-	return info->u.pirq.pirq;
-}
-
-static enum xen_irq_type type_from_irq(unsigned irq)
-{
-	return info_for_irq(irq)->type;
-}
-
-static unsigned cpu_from_irq(unsigned irq)
-{
-	return info_for_irq(irq)->cpu;
-}
-
-static unsigned int cpu_from_evtchn(unsigned int evtchn)
-{
-	int irq = evtchn_to_irq[evtchn];
-	unsigned ret = 0;
-
-	if (irq != -1)
-		ret = cpu_from_irq(irq);
-
-	return ret;
-}
-
-#ifdef CONFIG_X86
-static bool pirq_check_eoi_map(unsigned irq)
-{
-	return test_bit(pirq_from_irq(irq), pirq_eoi_map);
-}
-#endif
-
-static bool pirq_needs_eoi_flag(unsigned irq)
-{
-	struct irq_info *info = info_for_irq(irq);
-	BUG_ON(info->type != IRQT_PIRQ);
-
-	return info->u.pirq.flags & PIRQ_NEEDS_EOI;
-}
-
-static inline xen_ulong_t active_evtchns(unsigned int cpu,
-					 struct shared_info *sh,
-					 unsigned int idx)
-{
-	return sh->evtchn_pending[idx] &
-		per_cpu(cpu_evtchn_mask, cpu)[idx] &
-		~sh->evtchn_mask[idx];
-}
-
-static void bind_evtchn_to_cpu(unsigned int chn, unsigned int cpu)
-{
-	int irq = evtchn_to_irq[chn];
-
-	BUG_ON(irq == -1);
-#ifdef CONFIG_SMP
-	cpumask_copy(irq_to_desc(irq)->irq_data.affinity, cpumask_of(cpu));
-#endif
-
-	clear_bit(chn, BM(per_cpu(cpu_evtchn_mask, cpu_from_irq(irq))));
-	set_bit(chn, BM(per_cpu(cpu_evtchn_mask, cpu)));
-
-	info_for_irq(irq)->cpu = cpu;
-}
-
-static inline void clear_evtchn(int port)
-{
-	struct shared_info *s = HYPERVISOR_shared_info;
-	sync_clear_bit(port, BM(&s->evtchn_pending[0]));
-}
-
-static inline void set_evtchn(int port)
-{
-	struct shared_info *s = HYPERVISOR_shared_info;
-	sync_set_bit(port, BM(&s->evtchn_pending[0]));
-}
-
-static inline int test_evtchn(int port)
-{
-	struct shared_info *s = HYPERVISOR_shared_info;
-	return sync_test_bit(port, BM(&s->evtchn_pending[0]));
-}
-
-static inline int test_and_set_mask(int port)
-{
-	struct shared_info *s = HYPERVISOR_shared_info;
-	return sync_test_and_set_bit(port, BM(&s->evtchn_mask[0]));
-}
-
-
-/**
- * notify_remote_via_irq - send event to remote end of event channel via irq
- * @irq: irq of event channel to send event to
- *
- * Unlike notify_remote_via_evtchn(), this is safe to use across
- * save/restore. Notifications on a broken connection are silently
- * dropped.
- */
-void notify_remote_via_irq(int irq)
-{
-	int evtchn = evtchn_from_irq(irq);
-
-	if (VALID_EVTCHN(evtchn))
-		notify_remote_via_evtchn(evtchn);
-}
-EXPORT_SYMBOL_GPL(notify_remote_via_irq);
-
-static void mask_evtchn(int port)
-{
-	struct shared_info *s = HYPERVISOR_shared_info;
-	sync_set_bit(port, BM(&s->evtchn_mask[0]));
-}
-
-static void unmask_evtchn(int port)
-{
-	struct shared_info *s = HYPERVISOR_shared_info;
-	unsigned int cpu = get_cpu();
-	int do_hypercall = 0, evtchn_pending = 0;
-
-	BUG_ON(!irqs_disabled());
-
-	if (unlikely((cpu != cpu_from_evtchn(port))))
-		do_hypercall = 1;
-	else {
-		/*
-		 * Need to clear the mask before checking pending to
-		 * avoid a race with an event becoming pending.
-		 *
-		 * EVTCHNOP_unmask will only trigger an upcall if the
-		 * mask bit was set, so if a hypercall is needed
-		 * remask the event.
-		 */
-		sync_clear_bit(port, BM(&s->evtchn_mask[0]));
-		evtchn_pending = sync_test_bit(port, BM(&s->evtchn_pending[0]));
-
-		if (unlikely(evtchn_pending && xen_hvm_domain())) {
-			sync_set_bit(port, BM(&s->evtchn_mask[0]));
-			do_hypercall = 1;
-		}
-	}
-
-	/* Slow path (hypercall) if this is a non-local port or if this is
-	 * an hvm domain and an event is pending (hvm domains don't have
-	 * their own implementation of irq_enable). */
-	if (do_hypercall) {
-		struct evtchn_unmask unmask = { .port = port };
-		(void)HYPERVISOR_event_channel_op(EVTCHNOP_unmask, &unmask);
-	} else {
-		struct vcpu_info *vcpu_info = __this_cpu_read(xen_vcpu);
-
-		/*
-		 * The following is basically the equivalent of
-		 * 'hw_resend_irq'. Just like a real IO-APIC we 'lose
-		 * the interrupt edge' if the channel is masked.
-		 */
-		if (evtchn_pending &&
-		    !sync_test_and_set_bit(port / BITS_PER_EVTCHN_WORD,
-					   BM(&vcpu_info->evtchn_pending_sel)))
-			vcpu_info->evtchn_upcall_pending = 1;
-	}
-
-	put_cpu();
-}
-
-static void xen_irq_init(unsigned irq)
-{
-	struct irq_info *info;
-#ifdef CONFIG_SMP
-	struct irq_desc *desc = irq_to_desc(irq);
-
-	/* By default all event channels notify CPU#0. */
-	cpumask_copy(desc->irq_data.affinity, cpumask_of(0));
-#endif
-
-	info = kzalloc(sizeof(*info), GFP_KERNEL);
-	if (info == NULL)
-		panic("Unable to allocate metadata for IRQ%d\n", irq);
-
-	info->type = IRQT_UNBOUND;
-	info->refcnt = -1;
-
-	irq_set_handler_data(irq, info);
-
-	list_add_tail(&info->list, &xen_irq_list_head);
-}
-
-static int __must_check xen_allocate_irq_dynamic(void)
-{
-	int first = 0;
-	int irq;
-
-#ifdef CONFIG_X86_IO_APIC
-	/*
-	 * For an HVM guest or domain 0 which see "real" (emulated or
-	 * actual respectively) GSIs we allocate dynamic IRQs
-	 * e.g. those corresponding to event channels or MSIs
-	 * etc. from the range above those "real" GSIs to avoid
-	 * collisions.
-	 */
-	if (xen_initial_domain() || xen_hvm_domain())
-		first = get_nr_irqs_gsi();
-#endif
-
-	irq = irq_alloc_desc_from(first, -1);
-
-	if (irq >= 0)
-		xen_irq_init(irq);
-
-	return irq;
-}
-
-static int __must_check xen_allocate_irq_gsi(unsigned gsi)
-{
-	int irq;
-
-	/*
-	 * A PV guest has no concept of a GSI (since it has no ACPI
-	 * nor access to/knowledge of the physical APICs). Therefore
-	 * all IRQs are dynamically allocated from the entire IRQ
-	 * space.
-	 */
-	if (xen_pv_domain() && !xen_initial_domain())
-		return xen_allocate_irq_dynamic();
-
-	/* Legacy IRQ descriptors are already allocated by the arch. */
-	if (gsi < NR_IRQS_LEGACY)
-		irq = gsi;
-	else
-		irq = irq_alloc_desc_at(gsi, -1);
-
-	xen_irq_init(irq);
-
-	return irq;
-}
-
-static void xen_free_irq(unsigned irq)
-{
-	struct irq_info *info = irq_get_handler_data(irq);
-
-	if (WARN_ON(!info))
-		return;
-
-	list_del(&info->list);
-
-	irq_set_handler_data(irq, NULL);
-
-	WARN_ON(info->refcnt > 0);
-
-	kfree(info);
-
-	/* Legacy IRQ descriptors are managed by the arch. */
-	if (irq < NR_IRQS_LEGACY)
-		return;
-
-	irq_free_desc(irq);
-}
-
-static void pirq_query_unmask(int irq)
-{
-	struct physdev_irq_status_query irq_status;
-	struct irq_info *info = info_for_irq(irq);
-
-	BUG_ON(info->type != IRQT_PIRQ);
-
-	irq_status.irq = pirq_from_irq(irq);
-	if (HYPERVISOR_physdev_op(PHYSDEVOP_irq_status_query, &irq_status))
-		irq_status.flags = 0;
-
-	info->u.pirq.flags &= ~PIRQ_NEEDS_EOI;
-	if (irq_status.flags & XENIRQSTAT_needs_eoi)
-		info->u.pirq.flags |= PIRQ_NEEDS_EOI;
-}
-
-static bool probing_irq(int irq)
-{
-	struct irq_desc *desc = irq_to_desc(irq);
-
-	return desc && desc->action == NULL;
-}
-
-static void eoi_pirq(struct irq_data *data)
-{
-	int evtchn = evtchn_from_irq(data->irq);
-	struct physdev_eoi eoi = { .irq = pirq_from_irq(data->irq) };
-	int rc = 0;
-
-	irq_move_irq(data);
-
-	if (VALID_EVTCHN(evtchn))
-		clear_evtchn(evtchn);
-
-	if (pirq_needs_eoi(data->irq)) {
-		rc = HYPERVISOR_physdev_op(PHYSDEVOP_eoi, &eoi);
-		WARN_ON(rc);
-	}
-}
-
-static void mask_ack_pirq(struct irq_data *data)
-{
-	disable_dynirq(data);
-	eoi_pirq(data);
-}
-
-static unsigned int __startup_pirq(unsigned int irq)
-{
-	struct evtchn_bind_pirq bind_pirq;
-	struct irq_info *info = info_for_irq(irq);
-	int evtchn = evtchn_from_irq(irq);
-	int rc;
-
-	BUG_ON(info->type != IRQT_PIRQ);
-
-	if (VALID_EVTCHN(evtchn))
-		goto out;
-
-	bind_pirq.pirq = pirq_from_irq(irq);
-	/* NB. We are happy to share unless we are probing. */
-	bind_pirq.flags = info->u.pirq.flags & PIRQ_SHAREABLE ?
-					BIND_PIRQ__WILL_SHARE : 0;
-	rc = HYPERVISOR_event_channel_op(EVTCHNOP_bind_pirq, &bind_pirq);
-	if (rc != 0) {
-		if (!probing_irq(irq))
-			pr_info("Failed to obtain physical IRQ %d\n", irq);
-		return 0;
-	}
-	evtchn = bind_pirq.port;
-
-	pirq_query_unmask(irq);
-
-	evtchn_to_irq[evtchn] = irq;
-	bind_evtchn_to_cpu(evtchn, 0);
-	info->evtchn = evtchn;
-
-out:
-	unmask_evtchn(evtchn);
-	eoi_pirq(irq_get_irq_data(irq));
-
-	return 0;
-}
-
-static unsigned int startup_pirq(struct irq_data *data)
-{
-	return __startup_pirq(data->irq);
-}
-
-static void shutdown_pirq(struct irq_data *data)
-{
-	struct evtchn_close close;
-	unsigned int irq = data->irq;
-	struct irq_info *info = info_for_irq(irq);
-	int evtchn = evtchn_from_irq(irq);
-
-	BUG_ON(info->type != IRQT_PIRQ);
-
-	if (!VALID_EVTCHN(evtchn))
-		return;
-
-	mask_evtchn(evtchn);
-
-	close.port = evtchn;
-	if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0)
-		BUG();
-
-	bind_evtchn_to_cpu(evtchn, 0);
-	evtchn_to_irq[evtchn] = -1;
-	info->evtchn = 0;
-}
-
-static void enable_pirq(struct irq_data *data)
-{
-	startup_pirq(data);
-}
-
-static void disable_pirq(struct irq_data *data)
-{
-	disable_dynirq(data);
-}
-
-int xen_irq_from_gsi(unsigned gsi)
-{
-	struct irq_info *info;
-
-	list_for_each_entry(info, &xen_irq_list_head, list) {
-		if (info->type != IRQT_PIRQ)
-			continue;
-
-		if (info->u.pirq.gsi == gsi)
-			return info->irq;
-	}
-
-	return -1;
-}
-EXPORT_SYMBOL_GPL(xen_irq_from_gsi);
-
-/*
- * Do not make any assumptions regarding the relationship between the
- * IRQ number returned here and the Xen pirq argument.
- *
- * Note: We don't assign an event channel until the irq actually started
- * up.  Return an existing irq if we've already got one for the gsi.
- *
- * Shareable implies level triggered, not shareable implies edge
- * triggered here.
- */
-int xen_bind_pirq_gsi_to_irq(unsigned gsi,
-			     unsigned pirq, int shareable, char *name)
-{
-	int irq = -1;
-	struct physdev_irq irq_op;
-
-	mutex_lock(&irq_mapping_update_lock);
-
-	irq = xen_irq_from_gsi(gsi);
-	if (irq != -1) {
-		pr_info("%s: returning irq %d for gsi %u\n",
-			__func__, irq, gsi);
-		goto out;
-	}
-
-	irq = xen_allocate_irq_gsi(gsi);
-	if (irq < 0)
-		goto out;
-
-	irq_op.irq = irq;
-	irq_op.vector = 0;
-
-	/* Only the privileged domain can do this. For non-priv, the pcifront
-	 * driver provides a PCI bus that does the call to do exactly
-	 * this in the priv domain. */
-	if (xen_initial_domain() &&
-	    HYPERVISOR_physdev_op(PHYSDEVOP_alloc_irq_vector, &irq_op)) {
-		xen_free_irq(irq);
-		irq = -ENOSPC;
-		goto out;
-	}
-
-	xen_irq_info_pirq_init(irq, 0, pirq, gsi, DOMID_SELF,
-			       shareable ? PIRQ_SHAREABLE : 0);
-
-	pirq_query_unmask(irq);
-	/* We try to use the handler with the appropriate semantic for the
-	 * type of interrupt: if the interrupt is an edge triggered
-	 * interrupt we use handle_edge_irq.
-	 *
-	 * On the other hand if the interrupt is level triggered we use
-	 * handle_fasteoi_irq like the native code does for this kind of
-	 * interrupts.
-	 *
-	 * Depending on the Xen version, pirq_needs_eoi might return true
-	 * not only for level triggered interrupts but for edge triggered
-	 * interrupts too. In any case Xen always honors the eoi mechanism,
-	 * not injecting any more pirqs of the same kind if the first one
-	 * hasn't received an eoi yet. Therefore using the fasteoi handler
-	 * is the right choice either way.
-	 */
-	if (shareable)
-		irq_set_chip_and_handler_name(irq, &xen_pirq_chip,
-				handle_fasteoi_irq, name);
-	else
-		irq_set_chip_and_handler_name(irq, &xen_pirq_chip,
-				handle_edge_irq, name);
-
-out:
-	mutex_unlock(&irq_mapping_update_lock);
-
-	return irq;
-}
-
-#ifdef CONFIG_PCI_MSI
-int xen_allocate_pirq_msi(struct pci_dev *dev, struct msi_desc *msidesc)
-{
-	int rc;
-	struct physdev_get_free_pirq op_get_free_pirq;
-
-	op_get_free_pirq.type = MAP_PIRQ_TYPE_MSI;
-	rc = HYPERVISOR_physdev_op(PHYSDEVOP_get_free_pirq, &op_get_free_pirq);
-
-	WARN_ONCE(rc == -ENOSYS,
-		  "hypervisor does not support the PHYSDEVOP_get_free_pirq interface\n");
-
-	return rc ? -1 : op_get_free_pirq.pirq;
-}
-
-int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc,
-			     int pirq, const char *name, domid_t domid)
-{
-	int irq, ret;
-
-	mutex_lock(&irq_mapping_update_lock);
-
-	irq = xen_allocate_irq_dynamic();
-	if (irq < 0)
-		goto out;
-
-	irq_set_chip_and_handler_name(irq, &xen_pirq_chip, handle_edge_irq,
-			name);
-
-	xen_irq_info_pirq_init(irq, 0, pirq, 0, domid, 0);
-	ret = irq_set_msi_desc(irq, msidesc);
-	if (ret < 0)
-		goto error_irq;
-out:
-	mutex_unlock(&irq_mapping_update_lock);
-	return irq;
-error_irq:
-	mutex_unlock(&irq_mapping_update_lock);
-	xen_free_irq(irq);
-	return ret;
-}
-#endif
-
-int xen_destroy_irq(int irq)
-{
-	struct irq_desc *desc;
-	struct physdev_unmap_pirq unmap_irq;
-	struct irq_info *info = info_for_irq(irq);
-	int rc = -ENOENT;
-
-	mutex_lock(&irq_mapping_update_lock);
-
-	desc = irq_to_desc(irq);
-	if (!desc)
-		goto out;
-
-	if (xen_initial_domain()) {
-		unmap_irq.pirq = info->u.pirq.pirq;
-		unmap_irq.domid = info->u.pirq.domid;
-		rc = HYPERVISOR_physdev_op(PHYSDEVOP_unmap_pirq, &unmap_irq);
-		/* If another domain quits without making the pci_disable_msix
-		 * call, the Xen hypervisor takes care of freeing the PIRQs
-		 * (free_domain_pirqs).
-		 */
-		if ((rc == -ESRCH && info->u.pirq.domid != DOMID_SELF))
-			pr_info("domain %d does not have %d anymore\n",
-				info->u.pirq.domid, info->u.pirq.pirq);
-		else if (rc) {
-			pr_warn("unmap irq failed %d\n", rc);
-			goto out;
-		}
-	}
-
-	xen_free_irq(irq);
-
-out:
-	mutex_unlock(&irq_mapping_update_lock);
-	return rc;
-}
-
-int xen_irq_from_pirq(unsigned pirq)
-{
-	int irq;
-
-	struct irq_info *info;
-
-	mutex_lock(&irq_mapping_update_lock);
-
-	list_for_each_entry(info, &xen_irq_list_head, list) {
-		if (info->type != IRQT_PIRQ)
-			continue;
-		irq = info->irq;
-		if (info->u.pirq.pirq == pirq)
-			goto out;
-	}
-	irq = -1;
-out:
-	mutex_unlock(&irq_mapping_update_lock);
-
-	return irq;
-}
-
-
-int xen_pirq_from_irq(unsigned irq)
-{
-	return pirq_from_irq(irq);
-}
-EXPORT_SYMBOL_GPL(xen_pirq_from_irq);
-int bind_evtchn_to_irq(unsigned int evtchn)
-{
-	int irq;
-
-	mutex_lock(&irq_mapping_update_lock);
-
-	irq = evtchn_to_irq[evtchn];
-
-	if (irq == -1) {
-		irq = xen_allocate_irq_dynamic();
-		if (irq < 0)
-			goto out;
-
-		irq_set_chip_and_handler_name(irq, &xen_dynamic_chip,
-					      handle_edge_irq, "event");
-
-		xen_irq_info_evtchn_init(irq, evtchn);
-	} else {
-		struct irq_info *info = info_for_irq(irq);
-		WARN_ON(info == NULL || info->type != IRQT_EVTCHN);
-	}
-
-out:
-	mutex_unlock(&irq_mapping_update_lock);
-
-	return irq;
-}
-EXPORT_SYMBOL_GPL(bind_evtchn_to_irq);
-
-static int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu)
-{
-	struct evtchn_bind_ipi bind_ipi;
-	int evtchn, irq;
-
-	mutex_lock(&irq_mapping_update_lock);
-
-	irq = per_cpu(ipi_to_irq, cpu)[ipi];
-
-	if (irq == -1) {
-		irq = xen_allocate_irq_dynamic();
-		if (irq < 0)
-			goto out;
-
-		irq_set_chip_and_handler_name(irq, &xen_percpu_chip,
-					      handle_percpu_irq, "ipi");
-
-		bind_ipi.vcpu = cpu;
-		if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi,
-						&bind_ipi) != 0)
-			BUG();
-		evtchn = bind_ipi.port;
-
-		xen_irq_info_ipi_init(cpu, irq, evtchn, ipi);
-
-		bind_evtchn_to_cpu(evtchn, cpu);
-	} else {
-		struct irq_info *info = info_for_irq(irq);
-		WARN_ON(info == NULL || info->type != IRQT_IPI);
-	}
-
- out:
-	mutex_unlock(&irq_mapping_update_lock);
-	return irq;
-}
-
-static int bind_interdomain_evtchn_to_irq(unsigned int remote_domain,
-					  unsigned int remote_port)
-{
-	struct evtchn_bind_interdomain bind_interdomain;
-	int err;
-
-	bind_interdomain.remote_dom  = remote_domain;
-	bind_interdomain.remote_port = remote_port;
-
-	err = HYPERVISOR_event_channel_op(EVTCHNOP_bind_interdomain,
-					  &bind_interdomain);
-
-	return err ? : bind_evtchn_to_irq(bind_interdomain.local_port);
-}
-
-static int find_virq(unsigned int virq, unsigned int cpu)
-{
-	struct evtchn_status status;
-	int port, rc = -ENOENT;
-
-	memset(&status, 0, sizeof(status));
-	for (port = 0; port <= NR_EVENT_CHANNELS; port++) {
-		status.dom = DOMID_SELF;
-		status.port = port;
-		rc = HYPERVISOR_event_channel_op(EVTCHNOP_status, &status);
-		if (rc < 0)
-			continue;
-		if (status.status != EVTCHNSTAT_virq)
-			continue;
-		if (status.u.virq == virq && status.vcpu == cpu) {
-			rc = port;
-			break;
-		}
-	}
-	return rc;
-}
-
-int bind_virq_to_irq(unsigned int virq, unsigned int cpu)
-{
-	struct evtchn_bind_virq bind_virq;
-	int evtchn, irq, ret;
-
-	mutex_lock(&irq_mapping_update_lock);
-
-	irq = per_cpu(virq_to_irq, cpu)[virq];
-
-	if (irq == -1) {
-		irq = xen_allocate_irq_dynamic();
-		if (irq < 0)
-			goto out;
-
-		irq_set_chip_and_handler_name(irq, &xen_percpu_chip,
-					      handle_percpu_irq, "virq");
-
-		bind_virq.virq = virq;
-		bind_virq.vcpu = cpu;
-		ret = HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq,
-						&bind_virq);
-		if (ret == 0)
-			evtchn = bind_virq.port;
-		else {
-			if (ret == -EEXIST)
-				ret = find_virq(virq, cpu);
-			BUG_ON(ret < 0);
-			evtchn = ret;
-		}
-
-		xen_irq_info_virq_init(cpu, irq, evtchn, virq);
-
-		bind_evtchn_to_cpu(evtchn, cpu);
-	} else {
-		struct irq_info *info = info_for_irq(irq);
-		WARN_ON(info == NULL || info->type != IRQT_VIRQ);
-	}
-
-out:
-	mutex_unlock(&irq_mapping_update_lock);
-
-	return irq;
-}
-
-static void unbind_from_irq(unsigned int irq)
-{
-	struct evtchn_close close;
-	int evtchn = evtchn_from_irq(irq);
-	struct irq_info *info = irq_get_handler_data(irq);
-
-	if (WARN_ON(!info))
-		return;
-
-	mutex_lock(&irq_mapping_update_lock);
-
-	if (info->refcnt > 0) {
-		info->refcnt--;
-		if (info->refcnt != 0)
-			goto done;
-	}
-
-	if (VALID_EVTCHN(evtchn)) {
-		close.port = evtchn;
-		if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0)
-			BUG();
-
-		switch (type_from_irq(irq)) {
-		case IRQT_VIRQ:
-			per_cpu(virq_to_irq, cpu_from_evtchn(evtchn))
-				[virq_from_irq(irq)] = -1;
-			break;
-		case IRQT_IPI:
-			per_cpu(ipi_to_irq, cpu_from_evtchn(evtchn))
-				[ipi_from_irq(irq)] = -1;
-			break;
-		default:
-			break;
-		}
-
-		/* Closed ports are implicitly re-bound to VCPU0. */
-		bind_evtchn_to_cpu(evtchn, 0);
-
-		evtchn_to_irq[evtchn] = -1;
-	}
-
-	BUG_ON(info_for_irq(irq)->type == IRQT_UNBOUND);
-
-	xen_free_irq(irq);
-
- done:
-	mutex_unlock(&irq_mapping_update_lock);
-}
-
-int bind_evtchn_to_irqhandler(unsigned int evtchn,
-			      irq_handler_t handler,
-			      unsigned long irqflags,
-			      const char *devname, void *dev_id)
-{
-	int irq, retval;
-
-	irq = bind_evtchn_to_irq(evtchn);
-	if (irq < 0)
-		return irq;
-	retval = request_irq(irq, handler, irqflags, devname, dev_id);
-	if (retval != 0) {
-		unbind_from_irq(irq);
-		return retval;
-	}
-
-	return irq;
-}
-EXPORT_SYMBOL_GPL(bind_evtchn_to_irqhandler);
-
-int bind_interdomain_evtchn_to_irqhandler(unsigned int remote_domain,
-					  unsigned int remote_port,
-					  irq_handler_t handler,
-					  unsigned long irqflags,
-					  const char *devname,
-					  void *dev_id)
-{
-	int irq, retval;
-
-	irq = bind_interdomain_evtchn_to_irq(remote_domain, remote_port);
-	if (irq < 0)
-		return irq;
-
-	retval = request_irq(irq, handler, irqflags, devname, dev_id);
-	if (retval != 0) {
-		unbind_from_irq(irq);
-		return retval;
-	}
-
-	return irq;
-}
-EXPORT_SYMBOL_GPL(bind_interdomain_evtchn_to_irqhandler);
-
-int bind_virq_to_irqhandler(unsigned int virq, unsigned int cpu,
-			    irq_handler_t handler,
-			    unsigned long irqflags, const char *devname, void *dev_id)
-{
-	int irq, retval;
-
-	irq = bind_virq_to_irq(virq, cpu);
-	if (irq < 0)
-		return irq;
-	retval = request_irq(irq, handler, irqflags, devname, dev_id);
-	if (retval != 0) {
-		unbind_from_irq(irq);
-		return retval;
-	}
-
-	return irq;
-}
-EXPORT_SYMBOL_GPL(bind_virq_to_irqhandler);
-
-int bind_ipi_to_irqhandler(enum ipi_vector ipi,
-			   unsigned int cpu,
-			   irq_handler_t handler,
-			   unsigned long irqflags,
-			   const char *devname,
-			   void *dev_id)
-{
-	int irq, retval;
-
-	irq = bind_ipi_to_irq(ipi, cpu);
-	if (irq < 0)
-		return irq;
-
-	irqflags |= IRQF_NO_SUSPEND | IRQF_FORCE_RESUME | IRQF_EARLY_RESUME;
-	retval = request_irq(irq, handler, irqflags, devname, dev_id);
-	if (retval != 0) {
-		unbind_from_irq(irq);
-		return retval;
-	}
-
-	return irq;
-}
-
-void unbind_from_irqhandler(unsigned int irq, void *dev_id)
-{
-	struct irq_info *info = irq_get_handler_data(irq);
-
-	if (WARN_ON(!info))
-		return;
-	free_irq(irq, dev_id);
-	unbind_from_irq(irq);
-}
-EXPORT_SYMBOL_GPL(unbind_from_irqhandler);
-
-int evtchn_make_refcounted(unsigned int evtchn)
-{
-	int irq = evtchn_to_irq[evtchn];
-	struct irq_info *info;
-
-	if (irq == -1)
-		return -ENOENT;
-
-	info = irq_get_handler_data(irq);
-
-	if (!info)
-		return -ENOENT;
-
-	WARN_ON(info->refcnt != -1);
-
-	info->refcnt = 1;
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(evtchn_make_refcounted);
-
-int evtchn_get(unsigned int evtchn)
-{
-	int irq;
-	struct irq_info *info;
-	int err = -ENOENT;
-
-	if (evtchn >= NR_EVENT_CHANNELS)
-		return -EINVAL;
-
-	mutex_lock(&irq_mapping_update_lock);
-
-	irq = evtchn_to_irq[evtchn];
-	if (irq == -1)
-		goto done;
-
-	info = irq_get_handler_data(irq);
-
-	if (!info)
-		goto done;
-
-	err = -EINVAL;
-	if (info->refcnt <= 0)
-		goto done;
-
-	info->refcnt++;
-	err = 0;
- done:
-	mutex_unlock(&irq_mapping_update_lock);
-
-	return err;
-}
-EXPORT_SYMBOL_GPL(evtchn_get);
-
-void evtchn_put(unsigned int evtchn)
-{
-	int irq = evtchn_to_irq[evtchn];
-	if (WARN_ON(irq == -1))
-		return;
-	unbind_from_irq(irq);
-}
-EXPORT_SYMBOL_GPL(evtchn_put);
-
-void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector)
-{
-	int irq;
-
-#ifdef CONFIG_X86
-	if (unlikely(vector == XEN_NMI_VECTOR)) {
-		int rc =  HYPERVISOR_vcpu_op(VCPUOP_send_nmi, cpu, NULL);
-		if (rc < 0)
-			printk(KERN_WARNING "Sending nmi to CPU%d failed (rc:%d)\n", cpu, rc);
-		return;
-	}
-#endif
-	irq = per_cpu(ipi_to_irq, cpu)[vector];
-	BUG_ON(irq < 0);
-	notify_remote_via_irq(irq);
-}
-
-irqreturn_t xen_debug_interrupt(int irq, void *dev_id)
-{
-	struct shared_info *sh = HYPERVISOR_shared_info;
-	int cpu = smp_processor_id();
-	xen_ulong_t *cpu_evtchn = per_cpu(cpu_evtchn_mask, cpu);
-	int i;
-	unsigned long flags;
-	static DEFINE_SPINLOCK(debug_lock);
-	struct vcpu_info *v;
-
-	spin_lock_irqsave(&debug_lock, flags);
-
-	printk("\nvcpu %d\n  ", cpu);
-
-	for_each_online_cpu(i) {
-		int pending;
-		v = per_cpu(xen_vcpu, i);
-		pending = (get_irq_regs() && i == cpu)
-			? xen_irqs_disabled(get_irq_regs())
-			: v->evtchn_upcall_mask;
-		printk("%d: masked=%d pending=%d event_sel %0*"PRI_xen_ulong"\n  ", i,
-		       pending, v->evtchn_upcall_pending,
-		       (int)(sizeof(v->evtchn_pending_sel)*2),
-		       v->evtchn_pending_sel);
-	}
-	v = per_cpu(xen_vcpu, cpu);
-
-	printk("\npending:\n   ");
-	for (i = ARRAY_SIZE(sh->evtchn_pending)-1; i >= 0; i--)
-		printk("%0*"PRI_xen_ulong"%s",
-		       (int)sizeof(sh->evtchn_pending[0])*2,
-		       sh->evtchn_pending[i],
-		       i % 8 == 0 ? "\n   " : " ");
-	printk("\nglobal mask:\n   ");
-	for (i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--)
-		printk("%0*"PRI_xen_ulong"%s",
-		       (int)(sizeof(sh->evtchn_mask[0])*2),
-		       sh->evtchn_mask[i],
-		       i % 8 == 0 ? "\n   " : " ");
-
-	printk("\nglobally unmasked:\n   ");
-	for (i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--)
-		printk("%0*"PRI_xen_ulong"%s",
-		       (int)(sizeof(sh->evtchn_mask[0])*2),
-		       sh->evtchn_pending[i] & ~sh->evtchn_mask[i],
-		       i % 8 == 0 ? "\n   " : " ");
-
-	printk("\nlocal cpu%d mask:\n   ", cpu);
-	for (i = (NR_EVENT_CHANNELS/BITS_PER_EVTCHN_WORD)-1; i >= 0; i--)
-		printk("%0*"PRI_xen_ulong"%s", (int)(sizeof(cpu_evtchn[0])*2),
-		       cpu_evtchn[i],
-		       i % 8 == 0 ? "\n   " : " ");
-
-	printk("\nlocally unmasked:\n   ");
-	for (i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--) {
-		xen_ulong_t pending = sh->evtchn_pending[i]
-			& ~sh->evtchn_mask[i]
-			& cpu_evtchn[i];
-		printk("%0*"PRI_xen_ulong"%s",
-		       (int)(sizeof(sh->evtchn_mask[0])*2),
-		       pending, i % 8 == 0 ? "\n   " : " ");
-	}
-
-	printk("\npending list:\n");
-	for (i = 0; i < NR_EVENT_CHANNELS; i++) {
-		if (sync_test_bit(i, BM(sh->evtchn_pending))) {
-			int word_idx = i / BITS_PER_EVTCHN_WORD;
-			printk("  %d: event %d -> irq %d%s%s%s\n",
-			       cpu_from_evtchn(i), i,
-			       evtchn_to_irq[i],
-			       sync_test_bit(word_idx, BM(&v->evtchn_pending_sel))
-					     ? "" : " l2-clear",
-			       !sync_test_bit(i, BM(sh->evtchn_mask))
-					     ? "" : " globally-masked",
-			       sync_test_bit(i, BM(cpu_evtchn))
-					     ? "" : " locally-masked");
-		}
-	}
-
-	spin_unlock_irqrestore(&debug_lock, flags);
-
-	return IRQ_HANDLED;
-}
-
-static DEFINE_PER_CPU(unsigned, xed_nesting_count);
-static DEFINE_PER_CPU(unsigned int, current_word_idx);
-static DEFINE_PER_CPU(unsigned int, current_bit_idx);
-
-/*
- * Mask out the i least significant bits of w
- */
-#define MASK_LSBS(w, i) (w & ((~((xen_ulong_t)0UL)) << i))
-
-/*
- * Search the CPUs pending events bitmasks.  For each one found, map
- * the event number to an irq, and feed it into do_IRQ() for
- * handling.
- *
- * Xen uses a two-level bitmap to speed searching.  The first level is
- * a bitset of words which contain pending event bits.  The second
- * level is a bitset of pending events themselves.
- */
-static void __xen_evtchn_do_upcall(void)
-{
-	int start_word_idx, start_bit_idx;
-	int word_idx, bit_idx;
-	int i, irq;
-	int cpu = get_cpu();
-	struct shared_info *s = HYPERVISOR_shared_info;
-	struct vcpu_info *vcpu_info = __this_cpu_read(xen_vcpu);
-	unsigned count;
-
-	do {
-		xen_ulong_t pending_words;
-		xen_ulong_t pending_bits;
-		struct irq_desc *desc;
-
-		vcpu_info->evtchn_upcall_pending = 0;
-
-		if (__this_cpu_inc_return(xed_nesting_count) - 1)
-			goto out;
-
-		/*
-		 * Master flag must be cleared /before/ clearing
-		 * selector flag. xchg_xen_ulong must contain an
-		 * appropriate barrier.
-		 */
-		if ((irq = per_cpu(virq_to_irq, cpu)[VIRQ_TIMER]) != -1) {
-			int evtchn = evtchn_from_irq(irq);
-			word_idx = evtchn / BITS_PER_LONG;
-			pending_bits = evtchn % BITS_PER_LONG;
-			if (active_evtchns(cpu, s, word_idx) & (1ULL << pending_bits)) {
-				desc = irq_to_desc(irq);
-				if (desc)
-					generic_handle_irq_desc(irq, desc);
-			}
-		}
-
-		pending_words = xchg_xen_ulong(&vcpu_info->evtchn_pending_sel, 0);
-
-		start_word_idx = __this_cpu_read(current_word_idx);
-		start_bit_idx = __this_cpu_read(current_bit_idx);
-
-		word_idx = start_word_idx;
-
-		for (i = 0; pending_words != 0; i++) {
-			xen_ulong_t words;
-
-			words = MASK_LSBS(pending_words, word_idx);
-
-			/*
-			 * If we masked out all events, wrap to beginning.
-			 */
-			if (words == 0) {
-				word_idx = 0;
-				bit_idx = 0;
-				continue;
-			}
-			word_idx = EVTCHN_FIRST_BIT(words);
-
-			pending_bits = active_evtchns(cpu, s, word_idx);
-			bit_idx = 0; /* usually scan entire word from start */
-			/*
-			 * We scan the starting word in two parts.
-			 *
-			 * 1st time: start in the middle, scanning the
-			 * upper bits.
-			 *
-			 * 2nd time: scan the whole word (not just the
-			 * parts skipped in the first pass) -- if an
-			 * event in the previously scanned bits is
-			 * pending again it would just be scanned on
-			 * the next loop anyway.
-			 */
-			if (word_idx == start_word_idx) {
-				if (i == 0)
-					bit_idx = start_bit_idx;
-			}
-
-			do {
-				xen_ulong_t bits;
-				int port;
-
-				bits = MASK_LSBS(pending_bits, bit_idx);
-
-				/* If we masked out all events, move on. */
-				if (bits == 0)
-					break;
-
-				bit_idx = EVTCHN_FIRST_BIT(bits);
-
-				/* Process port. */
-				port = (word_idx * BITS_PER_EVTCHN_WORD) + bit_idx;
-				irq = evtchn_to_irq[port];
-
-				if (irq != -1) {
-					desc = irq_to_desc(irq);
-					if (desc)
-						generic_handle_irq_desc(irq, desc);
-				}
-
-				bit_idx = (bit_idx + 1) % BITS_PER_EVTCHN_WORD;
-
-				/* Next caller starts at last processed + 1 */
-				__this_cpu_write(current_word_idx,
-						 bit_idx ? word_idx :
-						 (word_idx+1) % BITS_PER_EVTCHN_WORD);
-				__this_cpu_write(current_bit_idx, bit_idx);
-			} while (bit_idx != 0);
-
-			/* Scan start_l1i twice; all others once. */
-			if ((word_idx != start_word_idx) || (i != 0))
-				pending_words &= ~(1UL << word_idx);
-
-			word_idx = (word_idx + 1) % BITS_PER_EVTCHN_WORD;
-		}
-
-		BUG_ON(!irqs_disabled());
-
-		count = __this_cpu_read(xed_nesting_count);
-		__this_cpu_write(xed_nesting_count, 0);
-	} while (count != 1 || vcpu_info->evtchn_upcall_pending);
-
-out:
-
-	put_cpu();
-}
-
-void xen_evtchn_do_upcall(struct pt_regs *regs)
-{
-	struct pt_regs *old_regs = set_irq_regs(regs);
-
-	irq_enter();
-#ifdef CONFIG_X86
-	exit_idle();
-#endif
-
-	__xen_evtchn_do_upcall();
-
-	irq_exit();
-	set_irq_regs(old_regs);
-}
-
-void xen_hvm_evtchn_do_upcall(void)
-{
-	__xen_evtchn_do_upcall();
-}
-EXPORT_SYMBOL_GPL(xen_hvm_evtchn_do_upcall);
-
-/* Rebind a new event channel to an existing irq. */
-void rebind_evtchn_irq(int evtchn, int irq)
-{
-	struct irq_info *info = info_for_irq(irq);
-
-	if (WARN_ON(!info))
-		return;
-
-	/* Make sure the irq is masked, since the new event channel
-	   will also be masked. */
-	disable_irq(irq);
-
-	mutex_lock(&irq_mapping_update_lock);
-
-	/* After resume the irq<->evtchn mappings are all cleared out */
-	BUG_ON(evtchn_to_irq[evtchn] != -1);
-	/* Expect irq to have been bound before,
-	   so there should be a proper type */
-	BUG_ON(info->type == IRQT_UNBOUND);
-
-	xen_irq_info_evtchn_init(irq, evtchn);
-
-	mutex_unlock(&irq_mapping_update_lock);
-
-	/* new event channels are always bound to cpu 0 */
-	irq_set_affinity(irq, cpumask_of(0));
-
-	/* Unmask the event channel. */
-	enable_irq(irq);
-}
-
-/* Rebind an evtchn so that it gets delivered to a specific cpu */
-static int rebind_irq_to_cpu(unsigned irq, unsigned tcpu)
-{
-	struct evtchn_bind_vcpu bind_vcpu;
-	int evtchn = evtchn_from_irq(irq);
-	int masked;
-
-	if (!VALID_EVTCHN(evtchn))
-		return -1;
-
-	/*
-	 * Events delivered via platform PCI interrupts are always
-	 * routed to vcpu 0 and hence cannot be rebound.
-	 */
-	if (xen_hvm_domain() && !xen_have_vector_callback)
-		return -1;
-
-	/* Send future instances of this interrupt to other vcpu. */
-	bind_vcpu.port = evtchn;
-	bind_vcpu.vcpu = tcpu;
-
-	/*
-	 * Mask the event while changing the VCPU binding to prevent
-	 * it being delivered on an unexpected VCPU.
-	 */
-	masked = test_and_set_mask(evtchn);
-
-	/*
-	 * If this fails, it usually just indicates that we're dealing with a
-	 * virq or IPI channel, which don't actually need to be rebound. Ignore
-	 * it, but don't do the xenlinux-level rebind in that case.
-	 */
-	if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_vcpu, &bind_vcpu) >= 0)
-		bind_evtchn_to_cpu(evtchn, tcpu);
-
-	if (!masked)
-		unmask_evtchn(evtchn);
-
-	return 0;
-}
-
-static int set_affinity_irq(struct irq_data *data, const struct cpumask *dest,
-			    bool force)
-{
-	unsigned tcpu = cpumask_first(dest);
-
-	return rebind_irq_to_cpu(data->irq, tcpu);
-}
-
-static int retrigger_evtchn(int evtchn)
-{
-	int masked;
-
-	if (!VALID_EVTCHN(evtchn))
-		return 0;
-
-	masked = test_and_set_mask(evtchn);
-	set_evtchn(evtchn);
-	if (!masked)
-		unmask_evtchn(evtchn);
-
-	return 1;
-}
-
-int resend_irq_on_evtchn(unsigned int irq)
-{
-	return retrigger_evtchn(evtchn_from_irq(irq));
-}
-
-static void enable_dynirq(struct irq_data *data)
-{
-	int evtchn = evtchn_from_irq(data->irq);
-
-	if (VALID_EVTCHN(evtchn))
-		unmask_evtchn(evtchn);
-}
-
-static void disable_dynirq(struct irq_data *data)
-{
-	int evtchn = evtchn_from_irq(data->irq);
-
-	if (VALID_EVTCHN(evtchn))
-		mask_evtchn(evtchn);
-}
-
-static void ack_dynirq(struct irq_data *data)
-{
-	int evtchn = evtchn_from_irq(data->irq);
-
-	irq_move_irq(data);
-
-	if (VALID_EVTCHN(evtchn))
-		clear_evtchn(evtchn);
-}
-
-static void mask_ack_dynirq(struct irq_data *data)
-{
-	disable_dynirq(data);
-	ack_dynirq(data);
-}
-
-static int retrigger_dynirq(struct irq_data *data)
-{
-	return retrigger_evtchn(evtchn_from_irq(data->irq));
-}
-
-static void restore_pirqs(void)
-{
-	int pirq, rc, irq, gsi;
-	struct physdev_map_pirq map_irq;
-	struct irq_info *info;
-
-	list_for_each_entry(info, &xen_irq_list_head, list) {
-		if (info->type != IRQT_PIRQ)
-			continue;
-
-		pirq = info->u.pirq.pirq;
-		gsi = info->u.pirq.gsi;
-		irq = info->irq;
-
-		/* save/restore of PT devices doesn't work, so at this point the
-		 * only devices present are GSI based emulated devices */
-		if (!gsi)
-			continue;
-
-		map_irq.domid = DOMID_SELF;
-		map_irq.type = MAP_PIRQ_TYPE_GSI;
-		map_irq.index = gsi;
-		map_irq.pirq = pirq;
-
-		rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
-		if (rc) {
-			pr_warn("xen map irq failed gsi=%d irq=%d pirq=%d rc=%d\n",
-				gsi, irq, pirq, rc);
-			xen_free_irq(irq);
-			continue;
-		}
-
-		printk(KERN_DEBUG "xen: --> irq=%d, pirq=%d\n", irq, map_irq.pirq);
-
-		__startup_pirq(irq);
-	}
-}
-
-static void restore_cpu_virqs(unsigned int cpu)
-{
-	struct evtchn_bind_virq bind_virq;
-	int virq, irq, evtchn;
-
-	for (virq = 0; virq < NR_VIRQS; virq++) {
-		if ((irq = per_cpu(virq_to_irq, cpu)[virq]) == -1)
-			continue;
-
-		BUG_ON(virq_from_irq(irq) != virq);
-
-		/* Get a new binding from Xen. */
-		bind_virq.virq = virq;
-		bind_virq.vcpu = cpu;
-		if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq,
-						&bind_virq) != 0)
-			BUG();
-		evtchn = bind_virq.port;
-
-		/* Record the new mapping. */
-		xen_irq_info_virq_init(cpu, irq, evtchn, virq);
-		bind_evtchn_to_cpu(evtchn, cpu);
-	}
-}
-
-static void restore_cpu_ipis(unsigned int cpu)
-{
-	struct evtchn_bind_ipi bind_ipi;
-	int ipi, irq, evtchn;
-
-	for (ipi = 0; ipi < XEN_NR_IPIS; ipi++) {
-		if ((irq = per_cpu(ipi_to_irq, cpu)[ipi]) == -1)
-			continue;
-
-		BUG_ON(ipi_from_irq(irq) != ipi);
-
-		/* Get a new binding from Xen. */
-		bind_ipi.vcpu = cpu;
-		if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi,
-						&bind_ipi) != 0)
-			BUG();
-		evtchn = bind_ipi.port;
-
-		/* Record the new mapping. */
-		xen_irq_info_ipi_init(cpu, irq, evtchn, ipi);
-		bind_evtchn_to_cpu(evtchn, cpu);
-	}
-}
-
-/* Clear an irq's pending state, in preparation for polling on it */
-void xen_clear_irq_pending(int irq)
-{
-	int evtchn = evtchn_from_irq(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);
-
-	if (VALID_EVTCHN(evtchn))
-		set_evtchn(evtchn);
-}
-
-bool xen_test_irq_pending(int irq)
-{
-	int evtchn = evtchn_from_irq(irq);
-	bool ret = false;
-
-	if (VALID_EVTCHN(evtchn))
-		ret = test_evtchn(evtchn);
-
-	return ret;
-}
-
-/* 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);
-
-	if (VALID_EVTCHN(evtchn)) {
-		struct sched_poll poll;
-
-		poll.nr_ports = 1;
-		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 */);
-}
-
-/* Check whether the IRQ line is shared with other guests. */
-int xen_test_irq_shared(int irq)
-{
-	struct irq_info *info = info_for_irq(irq);
-	struct physdev_irq_status_query irq_status;
-
-	if (WARN_ON(!info))
-		return -ENOENT;
-
-	irq_status.irq = info->u.pirq.pirq;
-
-	if (HYPERVISOR_physdev_op(PHYSDEVOP_irq_status_query, &irq_status))
-		return 0;
-	return !(irq_status.flags & XENIRQSTAT_shared);
-}
-EXPORT_SYMBOL_GPL(xen_test_irq_shared);
-
-void xen_irq_resume(void)
-{
-	unsigned int cpu, evtchn;
-	struct irq_info *info;
-
-	/* New event-channel space is not 'live' yet. */
-	for (evtchn = 0; evtchn < NR_EVENT_CHANNELS; evtchn++)
-		mask_evtchn(evtchn);
-
-	/* No IRQ <-> event-channel mappings. */
-	list_for_each_entry(info, &xen_irq_list_head, list)
-		info->evtchn = 0; /* zap event-channel binding */
-
-	for (evtchn = 0; evtchn < NR_EVENT_CHANNELS; evtchn++)
-		evtchn_to_irq[evtchn] = -1;
-
-	for_each_possible_cpu(cpu) {
-		restore_cpu_virqs(cpu);
-		restore_cpu_ipis(cpu);
-	}
-
-	restore_pirqs();
-}
-
-static struct irq_chip xen_dynamic_chip __read_mostly = {
-	.name			= "xen-dyn",
-
-	.irq_disable		= disable_dynirq,
-	.irq_mask		= disable_dynirq,
-	.irq_unmask		= enable_dynirq,
-
-	.irq_ack		= ack_dynirq,
-	.irq_mask_ack		= mask_ack_dynirq,
-
-	.irq_set_affinity	= set_affinity_irq,
-	.irq_retrigger		= retrigger_dynirq,
-};
-
-static struct irq_chip xen_pirq_chip __read_mostly = {
-	.name			= "xen-pirq",
-
-	.irq_startup		= startup_pirq,
-	.irq_shutdown		= shutdown_pirq,
-	.irq_enable		= enable_pirq,
-	.irq_disable		= disable_pirq,
-
-	.irq_mask		= disable_dynirq,
-	.irq_unmask		= enable_dynirq,
-
-	.irq_ack		= eoi_pirq,
-	.irq_eoi		= eoi_pirq,
-	.irq_mask_ack		= mask_ack_pirq,
-
-	.irq_set_affinity	= set_affinity_irq,
-
-	.irq_retrigger		= retrigger_dynirq,
-};
-
-static struct irq_chip xen_percpu_chip __read_mostly = {
-	.name			= "xen-percpu",
-
-	.irq_disable		= disable_dynirq,
-	.irq_mask		= disable_dynirq,
-	.irq_unmask		= enable_dynirq,
-
-	.irq_ack		= ack_dynirq,
-};
-
-int xen_set_callback_via(uint64_t via)
-{
-	struct xen_hvm_param a;
-	a.domid = DOMID_SELF;
-	a.index = HVM_PARAM_CALLBACK_IRQ;
-	a.value = via;
-	return HYPERVISOR_hvm_op(HVMOP_set_param, &a);
-}
-EXPORT_SYMBOL_GPL(xen_set_callback_via);
-
-#ifdef CONFIG_XEN_PVHVM
-/* Vector callbacks are better than PCI interrupts to receive event
- * channel notifications because we can receive vector callbacks on any
- * vcpu and we don't need PCI support or APIC interactions. */
-void xen_callback_vector(void)
-{
-	int rc;
-	uint64_t callback_via;
-	if (xen_have_vector_callback) {
-		callback_via = HVM_CALLBACK_VECTOR(HYPERVISOR_CALLBACK_VECTOR);
-		rc = xen_set_callback_via(callback_via);
-		if (rc) {
-			pr_err("Request for Xen HVM callback vector failed\n");
-			xen_have_vector_callback = 0;
-			return;
-		}
-		pr_info("Xen HVM callback vector for event delivery is enabled\n");
-		/* in the restore case the vector has already been allocated */
-		if (!test_bit(HYPERVISOR_CALLBACK_VECTOR, used_vectors))
-			alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR,
-					xen_hvm_callback_vector);
-	}
-}
-#else
-void xen_callback_vector(void) {}
-#endif
-
-void __init xen_init_IRQ(void)
-{
-	int i;
-
-	evtchn_to_irq = kcalloc(NR_EVENT_CHANNELS, sizeof(*evtchn_to_irq),
-				    GFP_KERNEL);
-	BUG_ON(!evtchn_to_irq);
-	for (i = 0; i < NR_EVENT_CHANNELS; i++)
-		evtchn_to_irq[i] = -1;
-
-	/* No event channels are 'live' right now. */
-	for (i = 0; i < NR_EVENT_CHANNELS; i++)
-		mask_evtchn(i);
-
-	pirq_needs_eoi = pirq_needs_eoi_flag;
-
-#ifdef CONFIG_X86
-	if (xen_hvm_domain()) {
-		xen_callback_vector();
-		native_init_IRQ();
-		/* pci_xen_hvm_init must be called after native_init_IRQ so that
-		 * __acpi_register_gsi can point at the right function */
-		pci_xen_hvm_init();
-	} else {
-		int rc;
-		struct physdev_pirq_eoi_gmfn eoi_gmfn;
-
-		irq_ctx_init(smp_processor_id());
-		if (xen_initial_domain())
-			pci_xen_initial_domain();
-
-		pirq_eoi_map = (void *)__get_free_page(GFP_KERNEL|__GFP_ZERO);
-		eoi_gmfn.gmfn = virt_to_mfn(pirq_eoi_map);
-		rc = HYPERVISOR_physdev_op(PHYSDEVOP_pirq_eoi_gmfn_v2, &eoi_gmfn);
-		if (rc != 0) {
-			free_page((unsigned long) pirq_eoi_map);
-			pirq_eoi_map = NULL;
-		} else
-			pirq_needs_eoi = pirq_check_eoi_map;
-	}
-#endif
-}