events.c 28.3 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 <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>
#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:
 *    PIRQ - vector, with MSB being "needs EIO"
 *    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 {
			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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static struct irq_info *irq_info;
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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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}

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

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)));
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	__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)
{
#ifdef CONFIG_SMP
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	struct irq_desc *desc;
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	int i;
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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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	memset(cpu_evtchn_mask(0), ~0, sizeof(cpu_evtchn_mask(0)));
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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 {
		struct vcpu_info *vcpu_info = __get_cpu_var(xen_vcpu);

		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 get_nr_hw_irqs(void)
{
	int ret = 1;

#ifdef CONFIG_X86_IO_APIC
	ret = get_nr_irqs_gsi();
#endif

	return ret;
}

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static int find_unbound_irq(void)
{
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	struct irq_data *data;
	int irq, res;
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	for (irq = 0; irq < nr_irqs; irq++) {
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		data = irq_get_irq_data(irq);
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		/* only 0->15 have init'd desc; handle irq > 16 */
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		if (!data)
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			break;
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		if (data->chip == &no_irq_chip)
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			break;
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		if (data->chip != &xen_dynamic_chip)
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			continue;
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		if (irq_info[irq].type == IRQT_UNBOUND)
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			return irq;
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	}
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	if (irq == nr_irqs)
		panic("No available IRQ to bind to: increase nr_irqs!\n");
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	res = irq_alloc_desc_at(irq, 0);
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	if (WARN_ON(res != irq))
		return -1;
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	return irq;
}

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static bool identity_mapped_irq(unsigned irq)
{
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	/* identity map all the hardware irqs */
	return irq < get_nr_hw_irqs();
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}

static void pirq_unmask_notify(int irq)
{
	struct physdev_eoi eoi = { .irq = irq };

	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);

	irq_status.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 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);

	BUG_ON(info->type != IRQT_PIRQ);

	if (VALID_EVTCHN(evtchn))
		goto out;

	bind_pirq.pirq = irq;
	/* NB. We are happy to share unless we are probing. */
	bind_pirq.flags = probing_irq(irq) ? 0 : BIND_PIRQ__WILL_SHARE;
	if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_pirq, &bind_pirq) != 0) {
		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;
}

/*
 * Allocate a physical irq, along with a vector.  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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int xen_allocate_pirq(unsigned gsi, char *name)
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{
	int irq;
	struct physdev_irq irq_op;

	spin_lock(&irq_mapping_update_lock);

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

	if (identity_mapped_irq(gsi)) {
		irq = gsi;
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		irq_to_desc_alloc_node(irq, 0);
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		dynamic_irq_init(irq);
	} else
		irq = find_unbound_irq();

	set_irq_chip_and_handler_name(irq, &xen_pirq_chip,
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				      handle_level_irq, name);
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	irq_op.irq = irq;
	if (HYPERVISOR_physdev_op(PHYSDEVOP_alloc_irq_vector, &irq_op)) {
		dynamic_irq_cleanup(irq);
		irq = -ENOSPC;
		goto out;
	}

	irq_info[irq] = mk_pirq_info(0, gsi, irq_op.vector);

out:
	spin_unlock(&irq_mapping_update_lock);

	return irq;
}

int xen_vector_from_irq(unsigned irq)
{
	return vector_from_irq(irq);
}

int xen_gsi_from_irq(unsigned irq)
{
	return gsi_from_irq(irq);
}

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int bind_evtchn_to_irq(unsigned int evtchn)
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{
	int irq;

	spin_lock(&irq_mapping_update_lock);

	irq = evtchn_to_irq[evtchn];

	if (irq == -1) {
		irq = find_unbound_irq();

		set_irq_chip_and_handler_name(irq, &xen_dynamic_chip,
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					      handle_edge_irq, "event");
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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);

	return irq;
}
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EXPORT_SYMBOL_GPL(bind_evtchn_to_irq);
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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];
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	if (irq == -1) {
		irq = find_unbound_irq();
		if (irq < 0)
			goto out;

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		set_irq_chip_and_handler_name(irq, &xen_percpu_chip,
					      handle_percpu_irq, "ipi");
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		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;
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		irq_info[irq] = mk_ipi_info(evtchn, ipi);
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		per_cpu(ipi_to_irq, cpu)[ipi] = irq;

		bind_evtchn_to_cpu(evtchn, cpu);
	}

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


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static int bind_virq_to_irq(unsigned int virq, unsigned int cpu)
{
	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) {
		bind_virq.virq = virq;
		bind_virq.vcpu = cpu;
		if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq,
						&bind_virq) != 0)
			BUG();
		evtchn = bind_virq.port;

		irq = find_unbound_irq();

680 681
		set_irq_chip_and_handler_name(irq, &xen_percpu_chip,
					      handle_percpu_irq, "virq");
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		evtchn_to_irq[evtchn] = irq;
684
		irq_info[irq] = mk_virq_info(evtchn, virq);
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		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);

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	if (VALID_EVTCHN(evtchn)) {
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704 705 706 707 708 709 710
		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))
711
				[virq_from_irq(irq)] = -1;
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712
			break;
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713 714
		case IRQT_IPI:
			per_cpu(ipi_to_irq, cpu_from_evtchn(evtchn))
715
				[ipi_from_irq(irq)] = -1;
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716
			break;
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717 718 719 720 721 722 723 724
		default:
			break;
		}

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

		evtchn_to_irq[evtchn] = -1;
725 726 727
	}

	if (irq_info[irq].type != IRQT_UNBOUND) {
728
		irq_info[irq] = mk_unbound_info();
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729

730
		irq_free_desc(irq);
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731 732 733 734 735 736
	}

	spin_unlock(&irq_mapping_update_lock);
}

int bind_evtchn_to_irqhandler(unsigned int evtchn,
737
			      irq_handler_t handler,
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738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755
			      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,
756
			    irq_handler_t handler,
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757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772
			    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);

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773 774 775 776 777 778 779 780 781 782 783 784 785
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
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	irqflags |= IRQF_NO_SUSPEND;
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787 788 789 790 791 792 793 794 795
	retval = request_irq(irq, handler, irqflags, devname, dev_id);
	if (retval != 0) {
		unbind_from_irq(irq);
		return retval;
	}

	return irq;
}

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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);

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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);
}

810 811 812 813 814 815 816 817 818 819 820 821 822 823 824
irqreturn_t xen_debug_interrupt(int irq, void *dev_id)
{
	struct shared_info *sh = HYPERVISOR_shared_info;
	int cpu = smp_processor_id();
	int i;
	unsigned long flags;
	static DEFINE_SPINLOCK(debug_lock);

	spin_lock_irqsave(&debug_lock, flags);

	printk("vcpu %d\n  ", cpu);

	for_each_online_cpu(i) {
		struct vcpu_info *v = per_cpu(xen_vcpu, i);
		printk("%d: masked=%d pending=%d event_sel %08lx\n  ", i,
825
			(get_irq_regs() && i == cpu) ? xen_irqs_disabled(get_irq_regs()) : v->evtchn_upcall_mask,
826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846
			v->evtchn_upcall_pending,
			v->evtchn_pending_sel);
	}
	printk("pending:\n   ");
	for(i = ARRAY_SIZE(sh->evtchn_pending)-1; i >= 0; i--)
		printk("%08lx%s", sh->evtchn_pending[i],
			i % 8 == 0 ? "\n   " : " ");
	printk("\nmasks:\n   ");
	for(i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--)
		printk("%08lx%s", sh->evtchn_mask[i],
			i % 8 == 0 ? "\n   " : " ");

	printk("\nunmasked:\n   ");
	for(i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--)
		printk("%08lx%s", sh->evtchn_pending[i] & ~sh->evtchn_mask[i],
			i % 8 == 0 ? "\n   " : " ");

	printk("\npending list:\n");
	for(i = 0; i < NR_EVENT_CHANNELS; i++) {
		if (sync_test_bit(i, sh->evtchn_pending)) {
			printk("  %d: event %d -> irq %d\n",
847 848
			       cpu_from_evtchn(i), i,
			       evtchn_to_irq[i]);
849 850 851 852 853 854 855 856
		}
	}

	spin_unlock_irqrestore(&debug_lock, flags);

	return IRQ_HANDLED;
}

857 858
static DEFINE_PER_CPU(unsigned, xed_nesting_count);

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/*
 * 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.
 */
868
static void __xen_evtchn_do_upcall(void)
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{
	int cpu = get_cpu();
	struct shared_info *s = HYPERVISOR_shared_info;
	struct vcpu_info *vcpu_info = __get_cpu_var(xen_vcpu);
873
 	unsigned count;
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874

875 876
	do {
		unsigned long pending_words;
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877

878
		vcpu_info->evtchn_upcall_pending = 0;
J
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879

880
		if (__get_cpu_var(xed_nesting_count)++)
881
			goto out;
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883 884
#ifndef CONFIG_X86 /* No need for a barrier -- XCHG is a barrier on x86. */
		/* Clear master flag /before/ clearing selector flag. */
885
		wmb();
886
#endif
887 888 889 890 891 892 893 894 895 896
		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];
897
				struct irq_desc *desc;
898

899 900 901 902 903
				if (irq != -1) {
					desc = irq_to_desc(irq);
					if (desc)
						generic_handle_irq_desc(irq, desc);
				}
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			}
		}

907 908
		BUG_ON(!irqs_disabled());

909 910
		count = __get_cpu_var(xed_nesting_count);
		__get_cpu_var(xed_nesting_count) = 0;
911
	} while (count != 1 || vcpu_info->evtchn_upcall_pending);
912 913

out:
914 915 916 917 918 919 920 921 922 923 924 925 926

	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();

927 928
	irq_exit();
	set_irq_regs(old_regs);
929
}
930

931 932 933
void xen_hvm_evtchn_do_upcall(void)
{
	__xen_evtchn_do_upcall();
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934
}
935
EXPORT_SYMBOL_GPL(xen_hvm_evtchn_do_upcall);
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936

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/* Rebind a new event channel to an existing irq. */
void rebind_evtchn_irq(int evtchn, int irq)
{
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	struct irq_info *info = info_for_irq(irq);

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	/* 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;
955
	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 */
960
	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 */
967
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);

972 973 974 975
	/* events delivered via platform PCI interrupts are always
	 * routed to vcpu 0 */
	if (!VALID_EVTCHN(evtchn) ||
		(xen_hvm_domain() && !xen_have_vector_callback))
976
		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);

990 991
	return 0;
}
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992

993
static int set_affinity_irq(unsigned irq, const struct cpumask *dest)
J
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994
{
995
	unsigned tcpu = cpumask_first(dest);
996 997

	return rebind_irq_to_cpu(irq, tcpu);
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}

1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015
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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1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044
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);

	move_native_irq(irq);

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

static int retrigger_dynirq(unsigned int irq)
{
	int evtchn = evtchn_from_irq(irq);
1045
	struct shared_info *sh = HYPERVISOR_shared_info;
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1046 1047 1048
	int ret = 0;

	if (VALID_EVTCHN(evtchn)) {
1049 1050 1051 1052 1053 1054
		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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1055 1056 1057 1058 1059 1060
		ret = 1;
	}

	return ret;
}

1061 1062 1063 1064 1065 1066 1067 1068 1069
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;

1070
		BUG_ON(virq_from_irq(irq) != virq);
1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081

		/* 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;
1082
		irq_info[irq] = mk_virq_info(evtchn, virq);
1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098
		bind_evtchn_to_cpu(evtchn, cpu);

		/* Ready for use. */
		unmask_evtchn(evtchn);
	}
}

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;

1099
		BUG_ON(ipi_from_irq(irq) != ipi);
1100 1101 1102 1103 1104 1105 1106 1107 1108 1109

		/* 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;
1110
		irq_info[irq] = mk_ipi_info(evtchn, ipi);
1111 1112 1113 1114 1115 1116 1117 1118
		bind_evtchn_to_cpu(evtchn, cpu);

		/* Ready for use. */
		unmask_evtchn(evtchn);

	}
}

1119 1120 1121 1122 1123 1124 1125 1126 1127
/* 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);
}

1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146
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;
}

1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157
/* 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)
{
	evtchn_port_t evtchn = evtchn_from_irq(irq);

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

		poll.nr_ports = 1;
		poll.timeout = 0;
1158
		set_xen_guest_handle(poll.ports, &evtchn);
1159 1160 1161 1162 1163 1164

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

1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175
void xen_irq_resume(void)
{
	unsigned int cpu, irq, evtchn;

	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. */
1176
	for (irq = 0; irq < nr_irqs; irq++)
1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187
		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);
	}
}

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static struct irq_chip xen_dynamic_chip __read_mostly = {
	.name		= "xen-dyn",
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1190 1191

	.disable	= disable_dynirq,
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	.mask		= disable_dynirq,
	.unmask		= enable_dynirq,
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1194

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1195 1196 1197 1198 1199
	.ack		= ack_dynirq,
	.set_affinity	= set_affinity_irq,
	.retrigger	= retrigger_dynirq,
};

1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219
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,
};

1220 1221 1222 1223 1224 1225 1226 1227 1228 1229
static struct irq_chip xen_percpu_chip __read_mostly = {
	.name		= "xen-percpu",

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

	.ack		= ack_dynirq,
};

1230 1231 1232 1233 1234 1235 1236 1237 1238 1239
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);

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#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);
	}
}
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#else
void xen_callback_vector(void) {}
#endif
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void __init xen_init_IRQ(void)
{
	int i;
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	cpu_evtchn_mask_p = kcalloc(nr_cpu_ids, sizeof(struct cpu_evtchn_s),
				    GFP_KERNEL);
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	irq_info = kcalloc(nr_irqs, sizeof(*irq_info), GFP_KERNEL);

	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);

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	if (xen_hvm_domain()) {
		xen_callback_vector();
		native_init_IRQ();
	} else {
		irq_ctx_init(smp_processor_id());
	}
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}