events.c 36.5 KB
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/*
 * 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 recieved, 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.
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 * 4. PIRQs - Hardware interrupts.
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 *
 * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
 */

#include <linux/linkage.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/string.h>
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#include <linux/bootmem.h>
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#include <linux/slab.h>
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#include <linux/irqnr.h>
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#include <linux/pci.h>
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#include <asm/desc.h>
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#include <asm/ptrace.h>
#include <asm/irq.h>
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#include <asm/idle.h>
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#include <asm/io_apic.h>
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#include <asm/sync_bitops.h>
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#include <asm/xen/pci.h>
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#include <asm/xen/hypercall.h>
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#include <asm/xen/hypervisor.h>
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#include <xen/xen.h>
#include <xen/hvm.h>
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#include <xen/xen-ops.h>
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#include <xen/events.h>
#include <xen/interface/xen.h>
#include <xen/interface/event_channel.h>
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#include <xen/interface/hvm/hvm_op.h>
#include <xen/interface/hvm/params.h>
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/*
 * 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_SPINLOCK(irq_mapping_update_lock);

/* IRQ <-> VIRQ mapping. */
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static DEFINE_PER_CPU(int [NR_VIRQS], virq_to_irq) = {[0 ... NR_VIRQS-1] = -1};
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/* IRQ <-> IPI mapping */
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static DEFINE_PER_CPU(int [XEN_NR_IPIS], ipi_to_irq) = {[0 ... XEN_NR_IPIS-1] = -1};
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/* Interrupt types. */
enum xen_irq_type {
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	IRQT_UNBOUND = 0,
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	IRQT_PIRQ,
	IRQT_VIRQ,
	IRQT_IPI,
	IRQT_EVTCHN
};
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/*
 * 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:
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 *    PIRQ - vector, with MSB being "needs EIO", or physical IRQ of the HVM
 *           guest, or GSI (real passthrough IRQ) of the device.
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 *    VIRQ - virq number
 *    IPI - IPI vector
 *    EVTCHN -
 */
struct irq_info
{
	enum xen_irq_type type;	/* type */
	unsigned short evtchn;	/* event channel */
	unsigned short cpu;	/* cpu bound */

	union {
		unsigned short virq;
		enum ipi_vector ipi;
		struct {
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			unsigned short pirq;
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			unsigned short gsi;
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			unsigned char vector;
			unsigned char flags;
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		} pirq;
	} u;
};
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#define PIRQ_NEEDS_EOI	(1 << 0)
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#define PIRQ_SHAREABLE	(1 << 1)
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static struct irq_info *irq_info;
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static int *pirq_to_irq;
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static int *evtchn_to_irq;
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struct cpu_evtchn_s {
	unsigned long bits[NR_EVENT_CHANNELS/BITS_PER_LONG];
};
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static __initdata struct cpu_evtchn_s init_evtchn_mask = {
	.bits[0 ... (NR_EVENT_CHANNELS/BITS_PER_LONG)-1] = ~0ul,
};
static struct cpu_evtchn_s *cpu_evtchn_mask_p = &init_evtchn_mask;

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static inline unsigned long *cpu_evtchn_mask(int cpu)
{
	return cpu_evtchn_mask_p[cpu].bits;
}
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/* Xen will never allocate port zero for any purpose. */
#define VALID_EVTCHN(chn)	((chn) != 0)

static struct irq_chip xen_dynamic_chip;
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static struct irq_chip xen_percpu_chip;
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static struct irq_chip xen_pirq_chip;
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/* Constructor for packed IRQ information. */
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static struct irq_info mk_unbound_info(void)
{
	return (struct irq_info) { .type = IRQT_UNBOUND };
}

static struct irq_info mk_evtchn_info(unsigned short evtchn)
{
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	return (struct irq_info) { .type = IRQT_EVTCHN, .evtchn = evtchn,
			.cpu = 0 };
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}

static struct irq_info mk_ipi_info(unsigned short evtchn, enum ipi_vector ipi)
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{
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	return (struct irq_info) { .type = IRQT_IPI, .evtchn = evtchn,
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			.cpu = 0, .u.ipi = ipi };
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}

static struct irq_info mk_virq_info(unsigned short evtchn, unsigned short virq)
{
	return (struct irq_info) { .type = IRQT_VIRQ, .evtchn = evtchn,
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			.cpu = 0, .u.virq = virq };
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}

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static struct irq_info mk_pirq_info(unsigned short evtchn, unsigned short pirq,
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				    unsigned short gsi, unsigned short vector)
{
	return (struct irq_info) { .type = IRQT_PIRQ, .evtchn = evtchn,
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			.cpu = 0,
			.u.pirq = { .pirq = pirq, .gsi = gsi, .vector = vector } };
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}

/*
 * Accessors for packed IRQ information.
 */
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static struct irq_info *info_for_irq(unsigned irq)
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{
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	return &irq_info[irq];
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}

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static unsigned int evtchn_from_irq(unsigned irq)
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{
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	if (unlikely(WARN(irq < 0 || irq >= nr_irqs, "Invalid irq %d!\n", irq)))
		return 0;

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	return info_for_irq(irq)->evtchn;
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}

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unsigned irq_from_evtchn(unsigned int evtchn)
{
	return evtchn_to_irq[evtchn];
}
EXPORT_SYMBOL_GPL(irq_from_evtchn);

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static enum ipi_vector ipi_from_irq(unsigned irq)
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{
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	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;
}

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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;
}

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static unsigned gsi_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.gsi;
}

static unsigned vector_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.vector;
}

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;
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}

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static bool pirq_needs_eoi(unsigned irq)
{
	struct irq_info *info = info_for_irq(irq);

	BUG_ON(info->type != IRQT_PIRQ);

	return info->u.pirq.flags & PIRQ_NEEDS_EOI;
}

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static inline unsigned long active_evtchns(unsigned int cpu,
					   struct shared_info *sh,
					   unsigned int idx)
{
	return (sh->evtchn_pending[idx] &
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		cpu_evtchn_mask(cpu)[idx] &
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		~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
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	cpumask_copy(irq_to_desc(irq)->affinity, cpumask_of(cpu));
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#endif

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	clear_bit(chn, cpu_evtchn_mask(cpu_from_irq(irq)));
	set_bit(chn, cpu_evtchn_mask(cpu));
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	irq_info[irq].cpu = cpu;
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}

static void init_evtchn_cpu_bindings(void)
{
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	int i;
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#ifdef CONFIG_SMP
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	struct irq_desc *desc;

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	/* By default all event channels notify CPU#0. */
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	for_each_irq_desc(i, desc) {
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		cpumask_copy(desc->affinity, cpumask_of(0));
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	}
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#endif

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	for_each_possible_cpu(i)
		memset(cpu_evtchn_mask(i),
		       (i == 0) ? ~0 : 0, sizeof(struct cpu_evtchn_s));

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}

static inline void clear_evtchn(int port)
{
	struct shared_info *s = HYPERVISOR_shared_info;
	sync_clear_bit(port, &s->evtchn_pending[0]);
}

static inline void set_evtchn(int port)
{
	struct shared_info *s = HYPERVISOR_shared_info;
	sync_set_bit(port, &s->evtchn_pending[0]);
}

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static inline int test_evtchn(int port)
{
	struct shared_info *s = HYPERVISOR_shared_info;
	return sync_test_bit(port, &s->evtchn_pending[0]);
}

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/**
 * 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, &s->evtchn_mask[0]);
}

static void unmask_evtchn(int port)
{
	struct shared_info *s = HYPERVISOR_shared_info;
	unsigned int cpu = get_cpu();

	BUG_ON(!irqs_disabled());

	/* Slow path (hypercall) if this is a non-local port. */
	if (unlikely(cpu != cpu_from_evtchn(port))) {
		struct evtchn_unmask unmask = { .port = port };
		(void)HYPERVISOR_event_channel_op(EVTCHNOP_unmask, &unmask);
	} else {
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		struct vcpu_info *vcpu_info = __this_cpu_read(xen_vcpu);
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		sync_clear_bit(port, &s->evtchn_mask[0]);

		/*
		 * 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 (sync_test_bit(port, &s->evtchn_pending[0]) &&
		    !sync_test_and_set_bit(port / BITS_PER_LONG,
					   &vcpu_info->evtchn_pending_sel))
			vcpu_info->evtchn_upcall_pending = 1;
	}

	put_cpu();
}

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static int xen_allocate_irq_dynamic(void)
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{
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	int first = 0;
	int irq;
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#ifdef CONFIG_X86_IO_APIC
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	/*
	 * For an HVM guest or domain 0 which see "real" (emulated or
	 * actual repectively) 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();
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#endif

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retry:
	irq = irq_alloc_desc_from(first, -1);
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	if (irq == -ENOMEM && first > NR_IRQS_LEGACY) {
		printk(KERN_ERR "Out of dynamic IRQ space and eating into GSI space. You should increase nr_irqs\n");
		first = max(NR_IRQS_LEGACY, first - NR_IRQS_LEGACY);
		goto retry;
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	}
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	if (irq < 0)
		panic("No available IRQ to bind to: increase nr_irqs!\n");
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	return irq;
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}

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static int xen_allocate_irq_gsi(unsigned gsi)
{
	int irq;

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	/*
	 * 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())
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		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);
}

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static void pirq_unmask_notify(int irq)
{
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	struct physdev_eoi eoi = { .irq = pirq_from_irq(irq) };
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	if (unlikely(pirq_needs_eoi(irq))) {
		int rc = HYPERVISOR_physdev_op(PHYSDEVOP_eoi, &eoi);
		WARN_ON(rc);
	}
}

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);

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	irq_status.irq = pirq_from_irq(irq);
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	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 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);
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	int rc;
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	BUG_ON(info->type != IRQT_PIRQ);

	if (VALID_EVTCHN(evtchn))
		goto out;

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	bind_pirq.pirq = pirq_from_irq(irq);
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	/* NB. We are happy to share unless we are probing. */
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	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) {
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		if (!probing_irq(irq))
			printk(KERN_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);
	pirq_unmask_notify(irq);

	return 0;
}

static void shutdown_pirq(unsigned int irq)
{
	struct evtchn_close close;
	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(unsigned int irq)
{
	startup_pirq(irq);
}

static void disable_pirq(unsigned int irq)
{
}

static void ack_pirq(unsigned int irq)
{
	int evtchn = evtchn_from_irq(irq);

	move_native_irq(irq);

	if (VALID_EVTCHN(evtchn)) {
		mask_evtchn(evtchn);
		clear_evtchn(evtchn);
	}
}

static void end_pirq(unsigned int irq)
{
	int evtchn = evtchn_from_irq(irq);
	struct irq_desc *desc = irq_to_desc(irq);

	if (WARN_ON(!desc))
		return;

	if ((desc->status & (IRQ_DISABLED|IRQ_PENDING)) ==
	    (IRQ_DISABLED|IRQ_PENDING)) {
		shutdown_pirq(irq);
	} else if (VALID_EVTCHN(evtchn)) {
		unmask_evtchn(evtchn);
		pirq_unmask_notify(irq);
	}
}

static int find_irq_by_gsi(unsigned gsi)
{
	int irq;

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	for (irq = 0; irq < nr_irqs; irq++) {
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		struct irq_info *info = info_for_irq(irq);

		if (info == NULL || info->type != IRQT_PIRQ)
			continue;

		if (gsi_from_irq(irq) == gsi)
			return irq;
	}

	return -1;
}

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int xen_allocate_pirq(unsigned gsi, int shareable, char *name)
{
	return xen_map_pirq_gsi(gsi, gsi, shareable, name);
}

/* xen_map_pirq_gsi might allocate irqs from the top down, as a
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 * consequence don't assume that the irq number returned has a low value
 * or can be used as a pirq number unless you know otherwise.
 *
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 * One notable exception is when xen_map_pirq_gsi is called passing an
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 * hardware gsi as argument, in that case the irq number returned
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 * matches the gsi number passed as second 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.
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 */
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int xen_map_pirq_gsi(unsigned pirq, unsigned gsi, int shareable, char *name)
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{
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	int irq = 0;
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	struct physdev_irq irq_op;

	spin_lock(&irq_mapping_update_lock);

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	if ((pirq > nr_irqs) || (gsi > nr_irqs)) {
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		printk(KERN_WARNING "xen_map_pirq_gsi: %s %s is incorrect!\n",
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			pirq > nr_irqs ? "pirq" :"",
			gsi > nr_irqs ? "gsi" : "");
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		goto out;
	}

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	irq = find_irq_by_gsi(gsi);
	if (irq != -1) {
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		printk(KERN_INFO "xen_map_pirq_gsi: returning irq %d for gsi %u\n",
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		       irq, gsi);
		goto out;	/* XXX need refcount? */
	}

625
	irq = xen_allocate_irq_gsi(gsi);
626 627

	set_irq_chip_and_handler_name(irq, &xen_pirq_chip,
628
				      handle_level_irq, name);
629 630

	irq_op.irq = irq;
631 632 633 634 635 636 637
	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)) {
638
		xen_free_irq(irq);
639 640 641 642
		irq = -ENOSPC;
		goto out;
	}

S
Stefano Stabellini 已提交
643
	irq_info[irq] = mk_pirq_info(0, pirq, gsi, irq_op.vector);
644
	irq_info[irq].u.pirq.flags |= shareable ? PIRQ_SHAREABLE : 0;
S
Stefano Stabellini 已提交
645
	pirq_to_irq[pirq] = irq;
646 647 648 649 650 651 652

out:
	spin_unlock(&irq_mapping_update_lock);

	return irq;
}

653 654 655 656
#ifdef CONFIG_PCI_MSI
#include <linux/msi.h>
#include "../pci/msi.h"

657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673
static int find_unbound_pirq(int type)
{
	int rc, i;
	struct physdev_get_free_pirq op_get_free_pirq;
	op_get_free_pirq.type = type;

	rc = HYPERVISOR_physdev_op(PHYSDEVOP_get_free_pirq, &op_get_free_pirq);
	if (!rc)
		return op_get_free_pirq.pirq;

	for (i = 0; i < nr_irqs; i++) {
		if (pirq_to_irq[i] < 0)
			return i;
	}
	return -1;
}

674
void xen_allocate_pirq_msi(char *name, int *irq, int *pirq, int alloc)
S
Stefano Stabellini 已提交
675 676 677
{
	spin_lock(&irq_mapping_update_lock);

678
	if (alloc & XEN_ALLOC_IRQ) {
679
		*irq = xen_allocate_irq_dynamic();
680 681 682
		if (*irq == -1)
			goto out;
	}
S
Stefano Stabellini 已提交
683

684 685 686 687 688
	if (alloc & XEN_ALLOC_PIRQ) {
		*pirq = find_unbound_pirq(MAP_PIRQ_TYPE_MSI);
		if (*pirq == -1)
			goto out;
	}
S
Stefano Stabellini 已提交
689 690 691 692 693 694 695 696 697 698 699

	set_irq_chip_and_handler_name(*irq, &xen_pirq_chip,
				      handle_level_irq, name);

	irq_info[*irq] = mk_pirq_info(0, *pirq, 0, 0);
	pirq_to_irq[*pirq] = *irq;

out:
	spin_unlock(&irq_mapping_update_lock);
}

700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728
int xen_create_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc, int type)
{
	int irq = -1;
	struct physdev_map_pirq map_irq;
	int rc;
	int pos;
	u32 table_offset, bir;

	memset(&map_irq, 0, sizeof(map_irq));
	map_irq.domid = DOMID_SELF;
	map_irq.type = MAP_PIRQ_TYPE_MSI;
	map_irq.index = -1;
	map_irq.pirq = -1;
	map_irq.bus = dev->bus->number;
	map_irq.devfn = dev->devfn;

	if (type == PCI_CAP_ID_MSIX) {
		pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);

		pci_read_config_dword(dev, msix_table_offset_reg(pos),
					&table_offset);
		bir = (u8)(table_offset & PCI_MSIX_FLAGS_BIRMASK);

		map_irq.table_base = pci_resource_start(dev, bir);
		map_irq.entry_nr = msidesc->msi_attrib.entry_nr;
	}

	spin_lock(&irq_mapping_update_lock);

729
	irq = xen_allocate_irq_dynamic();
730 731 732 733 734 735 736 737

	if (irq == -1)
		goto out;

	rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
	if (rc) {
		printk(KERN_WARNING "xen map irq failed %d\n", rc);

738
		xen_free_irq(irq);
739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754

		irq = -1;
		goto out;
	}
	irq_info[irq] = mk_pirq_info(0, map_irq.pirq, 0, map_irq.index);

	set_irq_chip_and_handler_name(irq, &xen_pirq_chip,
			handle_level_irq,
			(type == PCI_CAP_ID_MSIX) ? "msi-x":"msi");

out:
	spin_unlock(&irq_mapping_update_lock);
	return irq;
}
#endif

755 756 757
int xen_destroy_irq(int irq)
{
	struct irq_desc *desc;
758 759
	struct physdev_unmap_pirq unmap_irq;
	struct irq_info *info = info_for_irq(irq);
760 761 762 763 764 765 766 767
	int rc = -ENOENT;

	spin_lock(&irq_mapping_update_lock);

	desc = irq_to_desc(irq);
	if (!desc)
		goto out;

768
	if (xen_initial_domain()) {
769
		unmap_irq.pirq = info->u.pirq.pirq;
770 771 772 773 774 775
		unmap_irq.domid = DOMID_SELF;
		rc = HYPERVISOR_physdev_op(PHYSDEVOP_unmap_pirq, &unmap_irq);
		if (rc) {
			printk(KERN_WARNING "unmap irq failed %d\n", rc);
			goto out;
		}
776
		pirq_to_irq[info->u.pirq.pirq] = -1;
777
	}
778 779
	irq_info[irq] = mk_unbound_info();

780
	xen_free_irq(irq);
781 782 783 784 785 786

out:
	spin_unlock(&irq_mapping_update_lock);
	return rc;
}

787 788 789 790 791 792 793 794
int xen_vector_from_irq(unsigned irq)
{
	return vector_from_irq(irq);
}

int xen_gsi_from_irq(unsigned irq)
{
	return gsi_from_irq(irq);
J
Jeremy Fitzhardinge 已提交
795 796
}

797 798 799 800 801
int xen_irq_from_pirq(unsigned pirq)
{
	return pirq_to_irq[pirq];
}

802
int bind_evtchn_to_irq(unsigned int evtchn)
J
Jeremy Fitzhardinge 已提交
803 804 805 806 807 808 809 810
{
	int irq;

	spin_lock(&irq_mapping_update_lock);

	irq = evtchn_to_irq[evtchn];

	if (irq == -1) {
811
		irq = xen_allocate_irq_dynamic();
J
Jeremy Fitzhardinge 已提交
812 813

		set_irq_chip_and_handler_name(irq, &xen_dynamic_chip,
814
					      handle_fasteoi_irq, "event");
J
Jeremy Fitzhardinge 已提交
815 816

		evtchn_to_irq[evtchn] = irq;
817
		irq_info[irq] = mk_evtchn_info(evtchn);
J
Jeremy Fitzhardinge 已提交
818 819 820 821 822 823
	}

	spin_unlock(&irq_mapping_update_lock);

	return irq;
}
824
EXPORT_SYMBOL_GPL(bind_evtchn_to_irq);
J
Jeremy Fitzhardinge 已提交
825

J
Jeremy Fitzhardinge 已提交
826 827 828 829 830 831 832 833
static int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu)
{
	struct evtchn_bind_ipi bind_ipi;
	int evtchn, irq;

	spin_lock(&irq_mapping_update_lock);

	irq = per_cpu(ipi_to_irq, cpu)[ipi];
834

J
Jeremy Fitzhardinge 已提交
835
	if (irq == -1) {
836
		irq = xen_allocate_irq_dynamic();
J
Jeremy Fitzhardinge 已提交
837 838 839
		if (irq < 0)
			goto out;

840 841
		set_irq_chip_and_handler_name(irq, &xen_percpu_chip,
					      handle_percpu_irq, "ipi");
J
Jeremy Fitzhardinge 已提交
842 843 844 845 846 847 848 849

		bind_ipi.vcpu = cpu;
		if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi,
						&bind_ipi) != 0)
			BUG();
		evtchn = bind_ipi.port;

		evtchn_to_irq[evtchn] = irq;
850
		irq_info[irq] = mk_ipi_info(evtchn, ipi);
J
Jeremy Fitzhardinge 已提交
851 852 853 854 855 856 857 858 859 860 861
		per_cpu(ipi_to_irq, cpu)[ipi] = irq;

		bind_evtchn_to_cpu(evtchn, cpu);
	}

 out:
	spin_unlock(&irq_mapping_update_lock);
	return irq;
}


862
int bind_virq_to_irq(unsigned int virq, unsigned int cpu)
J
Jeremy Fitzhardinge 已提交
863 864 865 866 867 868 869 870 871
{
	struct evtchn_bind_virq bind_virq;
	int evtchn, irq;

	spin_lock(&irq_mapping_update_lock);

	irq = per_cpu(virq_to_irq, cpu)[virq];

	if (irq == -1) {
872
		irq = xen_allocate_irq_dynamic();
873 874 875 876

		set_irq_chip_and_handler_name(irq, &xen_percpu_chip,
					      handle_percpu_irq, "virq");

J
Jeremy Fitzhardinge 已提交
877 878 879 880 881 882 883 884
		bind_virq.virq = virq;
		bind_virq.vcpu = cpu;
		if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq,
						&bind_virq) != 0)
			BUG();
		evtchn = bind_virq.port;

		evtchn_to_irq[evtchn] = irq;
885
		irq_info[irq] = mk_virq_info(evtchn, virq);
J
Jeremy Fitzhardinge 已提交
886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903

		per_cpu(virq_to_irq, cpu)[virq] = irq;

		bind_evtchn_to_cpu(evtchn, cpu);
	}

	spin_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);

	spin_lock(&irq_mapping_update_lock);

J
Jeremy Fitzhardinge 已提交
904
	if (VALID_EVTCHN(evtchn)) {
J
Jeremy Fitzhardinge 已提交
905 906 907 908 909 910 911
		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))
912
				[virq_from_irq(irq)] = -1;
J
Jeremy Fitzhardinge 已提交
913
			break;
A
Alex Nixon 已提交
914 915
		case IRQT_IPI:
			per_cpu(ipi_to_irq, cpu_from_evtchn(evtchn))
916
				[ipi_from_irq(irq)] = -1;
A
Alex Nixon 已提交
917
			break;
J
Jeremy Fitzhardinge 已提交
918 919 920 921 922 923 924 925
		default:
			break;
		}

		/* Closed ports are implicitly re-bound to VCPU0. */
		bind_evtchn_to_cpu(evtchn, 0);

		evtchn_to_irq[evtchn] = -1;
926 927 928
	}

	if (irq_info[irq].type != IRQT_UNBOUND) {
929
		irq_info[irq] = mk_unbound_info();
J
Jeremy Fitzhardinge 已提交
930

931
		xen_free_irq(irq);
J
Jeremy Fitzhardinge 已提交
932 933 934 935 936 937
	}

	spin_unlock(&irq_mapping_update_lock);
}

int bind_evtchn_to_irqhandler(unsigned int evtchn,
938
			      irq_handler_t handler,
J
Jeremy Fitzhardinge 已提交
939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956
			      unsigned long irqflags,
			      const char *devname, void *dev_id)
{
	unsigned int irq;
	int retval;

	irq = bind_evtchn_to_irq(evtchn);
	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_virq_to_irqhandler(unsigned int virq, unsigned int cpu,
957
			    irq_handler_t handler,
J
Jeremy Fitzhardinge 已提交
958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973
			    unsigned long irqflags, const char *devname, void *dev_id)
{
	unsigned int irq;
	int retval;

	irq = bind_virq_to_irq(virq, cpu);
	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);

J
Jeremy Fitzhardinge 已提交
974 975 976 977 978 979 980 981 982 983 984 985 986
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;

I
Ian Campbell 已提交
987
	irqflags |= IRQF_NO_SUSPEND;
J
Jeremy Fitzhardinge 已提交
988 989 990 991 992 993 994 995 996
	retval = request_irq(irq, handler, irqflags, devname, dev_id);
	if (retval != 0) {
		unbind_from_irq(irq);
		return retval;
	}

	return irq;
}

J
Jeremy Fitzhardinge 已提交
997 998 999 1000 1001 1002 1003
void unbind_from_irqhandler(unsigned int irq, void *dev_id)
{
	free_irq(irq, dev_id);
	unbind_from_irq(irq);
}
EXPORT_SYMBOL_GPL(unbind_from_irqhandler);

J
Jeremy Fitzhardinge 已提交
1004 1005 1006 1007 1008 1009 1010
void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector)
{
	int irq = per_cpu(ipi_to_irq, cpu)[vector];
	BUG_ON(irq < 0);
	notify_remote_via_irq(irq);
}

1011 1012 1013 1014
irqreturn_t xen_debug_interrupt(int irq, void *dev_id)
{
	struct shared_info *sh = HYPERVISOR_shared_info;
	int cpu = smp_processor_id();
1015
	unsigned long *cpu_evtchn = cpu_evtchn_mask(cpu);
1016 1017 1018
	int i;
	unsigned long flags;
	static DEFINE_SPINLOCK(debug_lock);
1019
	struct vcpu_info *v;
1020 1021 1022

	spin_lock_irqsave(&debug_lock, flags);

1023
	printk("\nvcpu %d\n  ", cpu);
1024 1025

	for_each_online_cpu(i) {
1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068
		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*lx\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*lx%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*lx%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*lx%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_LONG)-1; i >= 0; i--)
		printk("%0*lx%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--) {
		unsigned long pending = sh->evtchn_pending[i]
			& ~sh->evtchn_mask[i]
			& cpu_evtchn[i];
		printk("%0*lx%s", (int)(sizeof(sh->evtchn_mask[0])*2),
		       pending, i % 8 == 0 ? "\n   " : " ");
1069 1070 1071
	}

	printk("\npending list:\n");
1072
	for (i = 0; i < NR_EVENT_CHANNELS; i++) {
1073
		if (sync_test_bit(i, sh->evtchn_pending)) {
1074 1075
			int word_idx = i / BITS_PER_LONG;
			printk("  %d: event %d -> irq %d%s%s%s\n",
1076
			       cpu_from_evtchn(i), i,
1077 1078 1079 1080 1081 1082 1083
			       evtchn_to_irq[i],
			       sync_test_bit(word_idx, &v->evtchn_pending_sel)
					     ? "" : " l2-clear",
			       !sync_test_bit(i, sh->evtchn_mask)
					     ? "" : " globally-masked",
			       sync_test_bit(i, cpu_evtchn)
					     ? "" : " locally-masked");
1084 1085 1086 1087 1088 1089 1090 1091
		}
	}

	spin_unlock_irqrestore(&debug_lock, flags);

	return IRQ_HANDLED;
}

1092 1093
static DEFINE_PER_CPU(unsigned, xed_nesting_count);

J
Jeremy Fitzhardinge 已提交
1094 1095 1096 1097 1098 1099 1100 1101 1102
/*
 * 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.
 */
1103
static void __xen_evtchn_do_upcall(void)
J
Jeremy Fitzhardinge 已提交
1104 1105 1106
{
	int cpu = get_cpu();
	struct shared_info *s = HYPERVISOR_shared_info;
C
Christoph Lameter 已提交
1107
	struct vcpu_info *vcpu_info = __this_cpu_read(xen_vcpu);
1108
 	unsigned count;
J
Jeremy Fitzhardinge 已提交
1109

1110 1111
	do {
		unsigned long pending_words;
J
Jeremy Fitzhardinge 已提交
1112

1113
		vcpu_info->evtchn_upcall_pending = 0;
J
Jeremy Fitzhardinge 已提交
1114

C
Christoph Lameter 已提交
1115
		if (__this_cpu_inc_return(xed_nesting_count) - 1)
1116
			goto out;
J
Jeremy Fitzhardinge 已提交
1117

1118 1119
#ifndef CONFIG_X86 /* No need for a barrier -- XCHG is a barrier on x86. */
		/* Clear master flag /before/ clearing selector flag. */
1120
		wmb();
1121
#endif
1122 1123 1124 1125 1126 1127 1128 1129 1130 1131
		pending_words = xchg(&vcpu_info->evtchn_pending_sel, 0);
		while (pending_words != 0) {
			unsigned long pending_bits;
			int word_idx = __ffs(pending_words);
			pending_words &= ~(1UL << word_idx);

			while ((pending_bits = active_evtchns(cpu, s, word_idx)) != 0) {
				int bit_idx = __ffs(pending_bits);
				int port = (word_idx * BITS_PER_LONG) + bit_idx;
				int irq = evtchn_to_irq[port];
1132
				struct irq_desc *desc;
1133

1134 1135 1136
				mask_evtchn(port);
				clear_evtchn(port);

1137 1138 1139 1140 1141
				if (irq != -1) {
					desc = irq_to_desc(irq);
					if (desc)
						generic_handle_irq_desc(irq, desc);
				}
J
Jeremy Fitzhardinge 已提交
1142 1143 1144
			}
		}

1145 1146
		BUG_ON(!irqs_disabled());

C
Christoph Lameter 已提交
1147 1148
		count = __this_cpu_read(xed_nesting_count);
		__this_cpu_write(xed_nesting_count, 0);
1149
	} while (count != 1 || vcpu_info->evtchn_upcall_pending);
1150 1151

out:
1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164

	put_cpu();
}

void xen_evtchn_do_upcall(struct pt_regs *regs)
{
	struct pt_regs *old_regs = set_irq_regs(regs);

	exit_idle();
	irq_enter();

	__xen_evtchn_do_upcall();

1165 1166
	irq_exit();
	set_irq_regs(old_regs);
1167
}
1168

1169 1170 1171
void xen_hvm_evtchn_do_upcall(void)
{
	__xen_evtchn_do_upcall();
J
Jeremy Fitzhardinge 已提交
1172
}
1173
EXPORT_SYMBOL_GPL(xen_hvm_evtchn_do_upcall);
J
Jeremy Fitzhardinge 已提交
1174

J
Jeremy Fitzhardinge 已提交
1175 1176 1177
/* Rebind a new event channel to an existing irq. */
void rebind_evtchn_irq(int evtchn, int irq)
{
J
Jeremy Fitzhardinge 已提交
1178 1179
	struct irq_info *info = info_for_irq(irq);

J
Jeremy Fitzhardinge 已提交
1180 1181 1182 1183 1184 1185 1186 1187 1188
	/* Make sure the irq is masked, since the new event channel
	   will also be masked. */
	disable_irq(irq);

	spin_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,
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	   so there should be a proper type */
	BUG_ON(info->type == IRQT_UNBOUND);
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	evtchn_to_irq[evtchn] = irq;
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	irq_info[irq] = mk_evtchn_info(evtchn);
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	spin_unlock(&irq_mapping_update_lock);

	/* new event channels are always bound to cpu 0 */
1198
	irq_set_affinity(irq, cpumask_of(0));
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	/* Unmask the event channel. */
	enable_irq(irq);
}

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/* Rebind an evtchn so that it gets delivered to a specific cpu */
1205
static int rebind_irq_to_cpu(unsigned irq, unsigned tcpu)
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{
	struct evtchn_bind_vcpu bind_vcpu;
	int evtchn = evtchn_from_irq(irq);

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	/* events delivered via platform PCI interrupts are always
	 * routed to vcpu 0 */
	if (!VALID_EVTCHN(evtchn) ||
		(xen_hvm_domain() && !xen_have_vector_callback))
1214
		return -1;
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	/* Send future instances of this interrupt to other vcpu. */
	bind_vcpu.port = evtchn;
	bind_vcpu.vcpu = tcpu;

	/*
	 * 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);

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	return 0;
}
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static int set_affinity_irq(unsigned irq, const struct cpumask *dest)
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{
1233
	unsigned tcpu = cpumask_first(dest);
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	return rebind_irq_to_cpu(irq, tcpu);
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}

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int resend_irq_on_evtchn(unsigned int irq)
{
	int masked, evtchn = evtchn_from_irq(irq);
	struct shared_info *s = HYPERVISOR_shared_info;

	if (!VALID_EVTCHN(evtchn))
		return 1;

	masked = sync_test_and_set_bit(evtchn, s->evtchn_mask);
	sync_set_bit(evtchn, s->evtchn_pending);
	if (!masked)
		unmask_evtchn(evtchn);

	return 1;
}

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static void enable_dynirq(unsigned int irq)
{
	int evtchn = evtchn_from_irq(irq);

	if (VALID_EVTCHN(evtchn))
		unmask_evtchn(evtchn);
}

static void disable_dynirq(unsigned int irq)
{
	int evtchn = evtchn_from_irq(irq);

	if (VALID_EVTCHN(evtchn))
		mask_evtchn(evtchn);
}

static void ack_dynirq(unsigned int irq)
{
	int evtchn = evtchn_from_irq(irq);

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	move_masked_irq(irq);
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	if (VALID_EVTCHN(evtchn))
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		unmask_evtchn(evtchn);
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}

static int retrigger_dynirq(unsigned int irq)
{
	int evtchn = evtchn_from_irq(irq);
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	struct shared_info *sh = HYPERVISOR_shared_info;
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	int ret = 0;

	if (VALID_EVTCHN(evtchn)) {
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		int masked;

		masked = sync_test_and_set_bit(evtchn, sh->evtchn_mask);
		sync_set_bit(evtchn, sh->evtchn_pending);
		if (!masked)
			unmask_evtchn(evtchn);
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		ret = 1;
	}

	return ret;
}

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static void restore_cpu_pirqs(void)
{
	int pirq, rc, irq, gsi;
	struct physdev_map_pirq map_irq;

	for (pirq = 0; pirq < nr_irqs; pirq++) {
		irq = pirq_to_irq[pirq];
		if (irq == -1)
			continue;

		/* save/restore of PT devices doesn't work, so at this point the
		 * only devices present are GSI based emulated devices */
		gsi = gsi_from_irq(irq);
		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) {
			printk(KERN_WARNING "xen map irq failed gsi=%d irq=%d pirq=%d rc=%d\n",
					gsi, irq, pirq, rc);
			irq_info[irq] = mk_unbound_info();
			pirq_to_irq[pirq] = -1;
			continue;
		}

		printk(KERN_DEBUG "xen: --> irq=%d, pirq=%d\n", irq, map_irq.pirq);

		startup_pirq(irq);
	}
}

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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;

1344
		BUG_ON(virq_from_irq(irq) != virq);
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		/* 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. */
		evtchn_to_irq[evtchn] = irq;
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		irq_info[irq] = mk_virq_info(evtchn, virq);
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		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;

1370
		BUG_ON(ipi_from_irq(irq) != ipi);
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		/* 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. */
		evtchn_to_irq[evtchn] = irq;
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		irq_info[irq] = mk_ipi_info(evtchn, ipi);
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		bind_evtchn_to_cpu(evtchn, cpu);
	}
}

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/* 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);
}
1394
EXPORT_SYMBOL(xen_clear_irq_pending);
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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;
}

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/* 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)
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{
	evtchn_port_t evtchn = evtchn_from_irq(irq);

	if (VALID_EVTCHN(evtchn)) {
		struct sched_poll poll;

		poll.nr_ports = 1;
1424
		poll.timeout = timeout;
1425
		set_xen_guest_handle(poll.ports, &evtchn);
1426 1427 1428 1429 1430

		if (HYPERVISOR_sched_op(SCHEDOP_poll, &poll) != 0)
			BUG();
	}
}
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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 */);
}
1438

1439 1440 1441
void xen_irq_resume(void)
{
	unsigned int cpu, irq, evtchn;
1442
	struct irq_desc *desc;
1443 1444 1445 1446 1447 1448 1449 1450

	init_evtchn_cpu_bindings();

	/* New event-channel space is not 'live' yet. */
	for (evtchn = 0; evtchn < NR_EVENT_CHANNELS; evtchn++)
		mask_evtchn(evtchn);

	/* No IRQ <-> event-channel mappings. */
1451
	for (irq = 0; irq < nr_irqs; irq++)
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		irq_info[irq].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);
	}
1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477

	/*
	 * Unmask any IRQF_NO_SUSPEND IRQs which are enabled. These
	 * are not handled by the IRQ core.
	 */
	for_each_irq_desc(irq, desc) {
		if (!desc->action || !(desc->action->flags & IRQF_NO_SUSPEND))
			continue;
		if (desc->status & IRQ_DISABLED)
			continue;

		evtchn = evtchn_from_irq(irq);
		if (evtchn == -1)
			continue;

		unmask_evtchn(evtchn);
	}
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	restore_cpu_pirqs();
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}

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static struct irq_chip xen_dynamic_chip __read_mostly = {
	.name		= "xen-dyn",
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	.disable	= disable_dynirq,
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	.mask		= disable_dynirq,
	.unmask		= enable_dynirq,
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	.eoi		= ack_dynirq,
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	.set_affinity	= set_affinity_irq,
	.retrigger	= retrigger_dynirq,
};

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static struct irq_chip xen_pirq_chip __read_mostly = {
	.name		= "xen-pirq",

	.startup	= startup_pirq,
	.shutdown	= shutdown_pirq,

	.enable		= enable_pirq,
	.unmask		= enable_pirq,

	.disable	= disable_pirq,
	.mask		= disable_pirq,

	.ack		= ack_pirq,
	.end		= end_pirq,

	.set_affinity	= set_affinity_irq,

	.retrigger	= retrigger_dynirq,
};

1514 1515 1516 1517 1518 1519 1520 1521 1522 1523
static struct irq_chip xen_percpu_chip __read_mostly = {
	.name		= "xen-percpu",

	.disable	= disable_dynirq,
	.mask		= disable_dynirq,
	.unmask		= enable_dynirq,

	.ack		= ack_dynirq,
};

1524 1525 1526 1527 1528 1529 1530 1531 1532 1533
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);

1534
#ifdef CONFIG_XEN_PVHVM
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/* 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(XEN_HVM_EVTCHN_CALLBACK);
		rc = xen_set_callback_via(callback_via);
		if (rc) {
			printk(KERN_ERR "Request for Xen HVM callback vector"
					" failed.\n");
			xen_have_vector_callback = 0;
			return;
		}
		printk(KERN_INFO "Xen HVM callback vector for event delivery is "
				"enabled\n");
		/* in the restore case the vector has already been allocated */
		if (!test_bit(XEN_HVM_EVTCHN_CALLBACK, used_vectors))
			alloc_intr_gate(XEN_HVM_EVTCHN_CALLBACK, xen_hvm_callback_vector);
	}
}
1558 1559 1560
#else
void xen_callback_vector(void) {}
#endif
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void __init xen_init_IRQ(void)
{
1564
	int i;
1565

1566 1567
	cpu_evtchn_mask_p = kcalloc(nr_cpu_ids, sizeof(struct cpu_evtchn_s),
				    GFP_KERNEL);
1568 1569
	irq_info = kcalloc(nr_irqs, sizeof(*irq_info), GFP_KERNEL);

1570 1571 1572 1573 1574
	/* We are using nr_irqs as the maximum number of pirq available but
	 * that number is actually chosen by Xen and we don't know exactly
	 * what it is. Be careful choosing high pirq numbers. */
	pirq_to_irq = kcalloc(nr_irqs, sizeof(*pirq_to_irq), GFP_KERNEL);
	for (i = 0; i < nr_irqs; i++)
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		pirq_to_irq[i] = -1;

1577 1578 1579 1580
	evtchn_to_irq = kcalloc(NR_EVENT_CHANNELS, sizeof(*evtchn_to_irq),
				    GFP_KERNEL);
	for (i = 0; i < NR_EVENT_CHANNELS; i++)
		evtchn_to_irq[i] = -1;
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	init_evtchn_cpu_bindings();

	/* No event channels are 'live' right now. */
	for (i = 0; i < NR_EVENT_CHANNELS; i++)
		mask_evtchn(i);

1588 1589 1590
	if (xen_hvm_domain()) {
		xen_callback_vector();
		native_init_IRQ();
1591 1592 1593
		/* 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();
1594 1595
	} else {
		irq_ctx_init(smp_processor_id());
1596 1597
		if (xen_initial_domain())
			xen_setup_pirqs();
1598
	}
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}