obj-$(CONFIG_HOTPLUG_CPU) += cpu_hotplug.o
endif
obj-$(CONFIG_X86) += fallback.o
-obj-y += grant-table.o features.o events.o balloon.o manage.o
+obj-y += grant-table.o features.o balloon.o manage.o
+obj-y += events/
obj-y += xenbus/
nostackp := $(call cc-option, -fno-stack-protector)
+++ /dev/null
-/*
- * Xen event channels
- *
- * Xen models interrupts with abstract event channels. Because each
- * domain gets 1024 event channels, but NR_IRQ is not that large, we
- * must dynamically map irqs<->event channels. The event channels
- * interface with the rest of the kernel by defining a xen interrupt
- * chip. When an event is received, it is mapped to an irq and sent
- * through the normal interrupt processing path.
- *
- * There are four kinds of events which can be mapped to an event
- * channel:
- *
- * 1. Inter-domain notifications. This includes all the virtual
- * device events, since they're driven by front-ends in another domain
- * (typically dom0).
- * 2. VIRQs, typically used for timers. These are per-cpu events.
- * 3. IPIs.
- * 4. PIRQs - Hardware interrupts.
- *
- * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
- */
-
-#define pr_fmt(fmt) "xen:" KBUILD_MODNAME ": " fmt
-
-#include <linux/linkage.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/module.h>
-#include <linux/string.h>
-#include <linux/bootmem.h>
-#include <linux/slab.h>
-#include <linux/irqnr.h>
-#include <linux/pci.h>
-
-#ifdef CONFIG_X86
-#include <asm/desc.h>
-#include <asm/ptrace.h>
-#include <asm/irq.h>
-#include <asm/idle.h>
-#include <asm/io_apic.h>
-#include <asm/xen/page.h>
-#include <asm/xen/pci.h>
-#endif
-#include <asm/sync_bitops.h>
-#include <asm/xen/hypercall.h>
-#include <asm/xen/hypervisor.h>
-
-#include <xen/xen.h>
-#include <xen/hvm.h>
-#include <xen/xen-ops.h>
-#include <xen/events.h>
-#include <xen/interface/xen.h>
-#include <xen/interface/event_channel.h>
-#include <xen/interface/hvm/hvm_op.h>
-#include <xen/interface/hvm/params.h>
-#include <xen/interface/physdev.h>
-#include <xen/interface/sched.h>
-#include <xen/interface/vcpu.h>
-#include <asm/hw_irq.h>
-
-/*
- * This lock protects updates to the following mapping and reference-count
- * arrays. The lock does not need to be acquired to read the mapping tables.
- */
-static DEFINE_MUTEX(irq_mapping_update_lock);
-
-static LIST_HEAD(xen_irq_list_head);
-
-/* IRQ <-> VIRQ mapping. */
-static DEFINE_PER_CPU(int [NR_VIRQS], virq_to_irq) = {[0 ... NR_VIRQS-1] = -1};
-
-/* IRQ <-> IPI mapping */
-static DEFINE_PER_CPU(int [XEN_NR_IPIS], ipi_to_irq) = {[0 ... XEN_NR_IPIS-1] = -1};
-
-/* Interrupt types. */
-enum xen_irq_type {
- IRQT_UNBOUND = 0,
- IRQT_PIRQ,
- IRQT_VIRQ,
- IRQT_IPI,
- IRQT_EVTCHN
-};
-
-/*
- * Packed IRQ information:
- * type - enum xen_irq_type
- * event channel - irq->event channel mapping
- * cpu - cpu this event channel is bound to
- * index - type-specific information:
- * PIRQ - physical IRQ, GSI, flags, and owner domain
- * VIRQ - virq number
- * IPI - IPI vector
- * EVTCHN -
- */
-struct irq_info {
- struct list_head list;
- int refcnt;
- enum xen_irq_type type; /* type */
- unsigned irq;
- unsigned short evtchn; /* event channel */
- unsigned short cpu; /* cpu bound */
-
- union {
- unsigned short virq;
- enum ipi_vector ipi;
- struct {
- unsigned short pirq;
- unsigned short gsi;
- unsigned char flags;
- uint16_t domid;
- } pirq;
- } u;
-};
-#define PIRQ_NEEDS_EOI (1 << 0)
-#define PIRQ_SHAREABLE (1 << 1)
-
-static int *evtchn_to_irq;
-#ifdef CONFIG_X86
-static unsigned long *pirq_eoi_map;
-#endif
-static bool (*pirq_needs_eoi)(unsigned irq);
-
-/*
- * Note sizeof(xen_ulong_t) can be more than sizeof(unsigned long). Be
- * careful to only use bitops which allow for this (e.g
- * test_bit/find_first_bit and friends but not __ffs) and to pass
- * BITS_PER_EVTCHN_WORD as the bitmask length.
- */
-#define BITS_PER_EVTCHN_WORD (sizeof(xen_ulong_t)*8)
-/*
- * Make a bitmask (i.e. unsigned long *) of a xen_ulong_t
- * array. Primarily to avoid long lines (hence the terse name).
- */
-#define BM(x) (unsigned long *)(x)
-/* Find the first set bit in a evtchn mask */
-#define EVTCHN_FIRST_BIT(w) find_first_bit(BM(&(w)), BITS_PER_EVTCHN_WORD)
-
-static DEFINE_PER_CPU(xen_ulong_t [NR_EVENT_CHANNELS/BITS_PER_EVTCHN_WORD],
- cpu_evtchn_mask);
-
-/* Xen will never allocate port zero for any purpose. */
-#define VALID_EVTCHN(chn) ((chn) != 0)
-
-static struct irq_chip xen_dynamic_chip;
-static struct irq_chip xen_percpu_chip;
-static struct irq_chip xen_pirq_chip;
-static void enable_dynirq(struct irq_data *data);
-static void disable_dynirq(struct irq_data *data);
-
-/* Get info for IRQ */
-static struct irq_info *info_for_irq(unsigned irq)
-{
- return irq_get_handler_data(irq);
-}
-
-/* Constructors for packed IRQ information. */
-static void xen_irq_info_common_init(struct irq_info *info,
- unsigned irq,
- enum xen_irq_type type,
- unsigned short evtchn,
- unsigned short cpu)
-{
-
- BUG_ON(info->type != IRQT_UNBOUND && info->type != type);
-
- info->type = type;
- info->irq = irq;
- info->evtchn = evtchn;
- info->cpu = cpu;
-
- evtchn_to_irq[evtchn] = irq;
-
- irq_clear_status_flags(irq, IRQ_NOREQUEST|IRQ_NOAUTOEN);
-}
-
-static void xen_irq_info_evtchn_init(unsigned irq,
- unsigned short evtchn)
-{
- struct irq_info *info = info_for_irq(irq);
-
- xen_irq_info_common_init(info, irq, IRQT_EVTCHN, evtchn, 0);
-}
-
-static void xen_irq_info_ipi_init(unsigned cpu,
- unsigned irq,
- unsigned short evtchn,
- enum ipi_vector ipi)
-{
- struct irq_info *info = info_for_irq(irq);
-
- xen_irq_info_common_init(info, irq, IRQT_IPI, evtchn, 0);
-
- info->u.ipi = ipi;
-
- per_cpu(ipi_to_irq, cpu)[ipi] = irq;
-}
-
-static void xen_irq_info_virq_init(unsigned cpu,
- unsigned irq,
- unsigned short evtchn,
- unsigned short virq)
-{
- struct irq_info *info = info_for_irq(irq);
-
- xen_irq_info_common_init(info, irq, IRQT_VIRQ, evtchn, 0);
-
- info->u.virq = virq;
-
- per_cpu(virq_to_irq, cpu)[virq] = irq;
-}
-
-static void xen_irq_info_pirq_init(unsigned irq,
- unsigned short evtchn,
- unsigned short pirq,
- unsigned short gsi,
- uint16_t domid,
- unsigned char flags)
-{
- struct irq_info *info = info_for_irq(irq);
-
- xen_irq_info_common_init(info, irq, IRQT_PIRQ, evtchn, 0);
-
- info->u.pirq.pirq = pirq;
- info->u.pirq.gsi = gsi;
- info->u.pirq.domid = domid;
- info->u.pirq.flags = flags;
-}
-
-/*
- * Accessors for packed IRQ information.
- */
-static unsigned int evtchn_from_irq(unsigned irq)
-{
- if (unlikely(WARN(irq < 0 || irq >= nr_irqs, "Invalid irq %d!\n", irq)))
- return 0;
-
- return info_for_irq(irq)->evtchn;
-}
-
-unsigned irq_from_evtchn(unsigned int evtchn)
-{
- return evtchn_to_irq[evtchn];
-}
-EXPORT_SYMBOL_GPL(irq_from_evtchn);
-
-static enum ipi_vector ipi_from_irq(unsigned irq)
-{
- struct irq_info *info = info_for_irq(irq);
-
- BUG_ON(info == NULL);
- BUG_ON(info->type != IRQT_IPI);
-
- return info->u.ipi;
-}
-
-static unsigned virq_from_irq(unsigned irq)
-{
- struct irq_info *info = info_for_irq(irq);
-
- BUG_ON(info == NULL);
- BUG_ON(info->type != IRQT_VIRQ);
-
- return info->u.virq;
-}
-
-static unsigned pirq_from_irq(unsigned irq)
-{
- struct irq_info *info = info_for_irq(irq);
-
- BUG_ON(info == NULL);
- BUG_ON(info->type != IRQT_PIRQ);
-
- return info->u.pirq.pirq;
-}
-
-static enum xen_irq_type type_from_irq(unsigned irq)
-{
- return info_for_irq(irq)->type;
-}
-
-static unsigned cpu_from_irq(unsigned irq)
-{
- return info_for_irq(irq)->cpu;
-}
-
-static unsigned int cpu_from_evtchn(unsigned int evtchn)
-{
- int irq = evtchn_to_irq[evtchn];
- unsigned ret = 0;
-
- if (irq != -1)
- ret = cpu_from_irq(irq);
-
- return ret;
-}
-
-#ifdef CONFIG_X86
-static bool pirq_check_eoi_map(unsigned irq)
-{
- return test_bit(pirq_from_irq(irq), pirq_eoi_map);
-}
-#endif
-
-static bool pirq_needs_eoi_flag(unsigned irq)
-{
- struct irq_info *info = info_for_irq(irq);
- BUG_ON(info->type != IRQT_PIRQ);
-
- return info->u.pirq.flags & PIRQ_NEEDS_EOI;
-}
-
-static inline xen_ulong_t active_evtchns(unsigned int cpu,
- struct shared_info *sh,
- unsigned int idx)
-{
- return sh->evtchn_pending[idx] &
- per_cpu(cpu_evtchn_mask, cpu)[idx] &
- ~sh->evtchn_mask[idx];
-}
-
-static void bind_evtchn_to_cpu(unsigned int chn, unsigned int cpu)
-{
- int irq = evtchn_to_irq[chn];
-
- BUG_ON(irq == -1);
-#ifdef CONFIG_SMP
- cpumask_copy(irq_to_desc(irq)->irq_data.affinity, cpumask_of(cpu));
-#endif
-
- clear_bit(chn, BM(per_cpu(cpu_evtchn_mask, cpu_from_irq(irq))));
- set_bit(chn, BM(per_cpu(cpu_evtchn_mask, cpu)));
-
- info_for_irq(irq)->cpu = cpu;
-}
-
-static inline void clear_evtchn(int port)
-{
- struct shared_info *s = HYPERVISOR_shared_info;
- sync_clear_bit(port, BM(&s->evtchn_pending[0]));
-}
-
-static inline void set_evtchn(int port)
-{
- struct shared_info *s = HYPERVISOR_shared_info;
- sync_set_bit(port, BM(&s->evtchn_pending[0]));
-}
-
-static inline int test_evtchn(int port)
-{
- struct shared_info *s = HYPERVISOR_shared_info;
- return sync_test_bit(port, BM(&s->evtchn_pending[0]));
-}
-
-static inline int test_and_set_mask(int port)
-{
- struct shared_info *s = HYPERVISOR_shared_info;
- return sync_test_and_set_bit(port, BM(&s->evtchn_mask[0]));
-}
-
-
-/**
- * notify_remote_via_irq - send event to remote end of event channel via irq
- * @irq: irq of event channel to send event to
- *
- * Unlike notify_remote_via_evtchn(), this is safe to use across
- * save/restore. Notifications on a broken connection are silently
- * dropped.
- */
-void notify_remote_via_irq(int irq)
-{
- int evtchn = evtchn_from_irq(irq);
-
- if (VALID_EVTCHN(evtchn))
- notify_remote_via_evtchn(evtchn);
-}
-EXPORT_SYMBOL_GPL(notify_remote_via_irq);
-
-static void mask_evtchn(int port)
-{
- struct shared_info *s = HYPERVISOR_shared_info;
- sync_set_bit(port, BM(&s->evtchn_mask[0]));
-}
-
-static void unmask_evtchn(int port)
-{
- struct shared_info *s = HYPERVISOR_shared_info;
- unsigned int cpu = get_cpu();
- int do_hypercall = 0, evtchn_pending = 0;
-
- BUG_ON(!irqs_disabled());
-
- if (unlikely((cpu != cpu_from_evtchn(port))))
- do_hypercall = 1;
- else {
- /*
- * Need to clear the mask before checking pending to
- * avoid a race with an event becoming pending.
- *
- * EVTCHNOP_unmask will only trigger an upcall if the
- * mask bit was set, so if a hypercall is needed
- * remask the event.
- */
- sync_clear_bit(port, BM(&s->evtchn_mask[0]));
- evtchn_pending = sync_test_bit(port, BM(&s->evtchn_pending[0]));
-
- if (unlikely(evtchn_pending && xen_hvm_domain())) {
- sync_set_bit(port, BM(&s->evtchn_mask[0]));
- do_hypercall = 1;
- }
- }
-
- /* Slow path (hypercall) if this is a non-local port or if this is
- * an hvm domain and an event is pending (hvm domains don't have
- * their own implementation of irq_enable). */
- if (do_hypercall) {
- struct evtchn_unmask unmask = { .port = port };
- (void)HYPERVISOR_event_channel_op(EVTCHNOP_unmask, &unmask);
- } else {
- struct vcpu_info *vcpu_info = __this_cpu_read(xen_vcpu);
-
- /*
- * The following is basically the equivalent of
- * 'hw_resend_irq'. Just like a real IO-APIC we 'lose
- * the interrupt edge' if the channel is masked.
- */
- if (evtchn_pending &&
- !sync_test_and_set_bit(port / BITS_PER_EVTCHN_WORD,
- BM(&vcpu_info->evtchn_pending_sel)))
- vcpu_info->evtchn_upcall_pending = 1;
- }
-
- put_cpu();
-}
-
-static void xen_irq_init(unsigned irq)
-{
- struct irq_info *info;
-#ifdef CONFIG_SMP
- struct irq_desc *desc = irq_to_desc(irq);
-
- /* By default all event channels notify CPU#0. */
- cpumask_copy(desc->irq_data.affinity, cpumask_of(0));
-#endif
-
- info = kzalloc(sizeof(*info), GFP_KERNEL);
- if (info == NULL)
- panic("Unable to allocate metadata for IRQ%d\n", irq);
-
- info->type = IRQT_UNBOUND;
- info->refcnt = -1;
-
- irq_set_handler_data(irq, info);
-
- list_add_tail(&info->list, &xen_irq_list_head);
-}
-
-static int __must_check xen_allocate_irq_dynamic(void)
-{
- int first = 0;
- int irq;
-
-#ifdef CONFIG_X86_IO_APIC
- /*
- * For an HVM guest or domain 0 which see "real" (emulated or
- * actual respectively) GSIs we allocate dynamic IRQs
- * e.g. those corresponding to event channels or MSIs
- * etc. from the range above those "real" GSIs to avoid
- * collisions.
- */
- if (xen_initial_domain() || xen_hvm_domain())
- first = get_nr_irqs_gsi();
-#endif
-
- irq = irq_alloc_desc_from(first, -1);
-
- if (irq >= 0)
- xen_irq_init(irq);
-
- return irq;
-}
-
-static int __must_check xen_allocate_irq_gsi(unsigned gsi)
-{
- int irq;
-
- /*
- * A PV guest has no concept of a GSI (since it has no ACPI
- * nor access to/knowledge of the physical APICs). Therefore
- * all IRQs are dynamically allocated from the entire IRQ
- * space.
- */
- if (xen_pv_domain() && !xen_initial_domain())
- return xen_allocate_irq_dynamic();
-
- /* Legacy IRQ descriptors are already allocated by the arch. */
- if (gsi < NR_IRQS_LEGACY)
- irq = gsi;
- else
- irq = irq_alloc_desc_at(gsi, -1);
-
- xen_irq_init(irq);
-
- return irq;
-}
-
-static void xen_free_irq(unsigned irq)
-{
- struct irq_info *info = irq_get_handler_data(irq);
-
- if (WARN_ON(!info))
- return;
-
- list_del(&info->list);
-
- irq_set_handler_data(irq, NULL);
-
- WARN_ON(info->refcnt > 0);
-
- kfree(info);
-
- /* Legacy IRQ descriptors are managed by the arch. */
- if (irq < NR_IRQS_LEGACY)
- return;
-
- irq_free_desc(irq);
-}
-
-static void pirq_query_unmask(int irq)
-{
- struct physdev_irq_status_query irq_status;
- struct irq_info *info = info_for_irq(irq);
-
- BUG_ON(info->type != IRQT_PIRQ);
-
- irq_status.irq = pirq_from_irq(irq);
- if (HYPERVISOR_physdev_op(PHYSDEVOP_irq_status_query, &irq_status))
- irq_status.flags = 0;
-
- info->u.pirq.flags &= ~PIRQ_NEEDS_EOI;
- if (irq_status.flags & XENIRQSTAT_needs_eoi)
- info->u.pirq.flags |= PIRQ_NEEDS_EOI;
-}
-
-static bool probing_irq(int irq)
-{
- struct irq_desc *desc = irq_to_desc(irq);
-
- return desc && desc->action == NULL;
-}
-
-static void eoi_pirq(struct irq_data *data)
-{
- int evtchn = evtchn_from_irq(data->irq);
- struct physdev_eoi eoi = { .irq = pirq_from_irq(data->irq) };
- int rc = 0;
-
- irq_move_irq(data);
-
- if (VALID_EVTCHN(evtchn))
- clear_evtchn(evtchn);
-
- if (pirq_needs_eoi(data->irq)) {
- rc = HYPERVISOR_physdev_op(PHYSDEVOP_eoi, &eoi);
- WARN_ON(rc);
- }
-}
-
-static void mask_ack_pirq(struct irq_data *data)
-{
- disable_dynirq(data);
- eoi_pirq(data);
-}
-
-static unsigned int __startup_pirq(unsigned int irq)
-{
- struct evtchn_bind_pirq bind_pirq;
- struct irq_info *info = info_for_irq(irq);
- int evtchn = evtchn_from_irq(irq);
- int rc;
-
- BUG_ON(info->type != IRQT_PIRQ);
-
- if (VALID_EVTCHN(evtchn))
- goto out;
-
- bind_pirq.pirq = pirq_from_irq(irq);
- /* NB. We are happy to share unless we are probing. */
- bind_pirq.flags = info->u.pirq.flags & PIRQ_SHAREABLE ?
- BIND_PIRQ__WILL_SHARE : 0;
- rc = HYPERVISOR_event_channel_op(EVTCHNOP_bind_pirq, &bind_pirq);
- if (rc != 0) {
- if (!probing_irq(irq))
- pr_info("Failed to obtain physical IRQ %d\n", irq);
- return 0;
- }
- evtchn = bind_pirq.port;
-
- pirq_query_unmask(irq);
-
- evtchn_to_irq[evtchn] = irq;
- bind_evtchn_to_cpu(evtchn, 0);
- info->evtchn = evtchn;
-
-out:
- unmask_evtchn(evtchn);
- eoi_pirq(irq_get_irq_data(irq));
-
- return 0;
-}
-
-static unsigned int startup_pirq(struct irq_data *data)
-{
- return __startup_pirq(data->irq);
-}
-
-static void shutdown_pirq(struct irq_data *data)
-{
- struct evtchn_close close;
- unsigned int irq = data->irq;
- struct irq_info *info = info_for_irq(irq);
- int evtchn = evtchn_from_irq(irq);
-
- BUG_ON(info->type != IRQT_PIRQ);
-
- if (!VALID_EVTCHN(evtchn))
- return;
-
- mask_evtchn(evtchn);
-
- close.port = evtchn;
- if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0)
- BUG();
-
- bind_evtchn_to_cpu(evtchn, 0);
- evtchn_to_irq[evtchn] = -1;
- info->evtchn = 0;
-}
-
-static void enable_pirq(struct irq_data *data)
-{
- startup_pirq(data);
-}
-
-static void disable_pirq(struct irq_data *data)
-{
- disable_dynirq(data);
-}
-
-int xen_irq_from_gsi(unsigned gsi)
-{
- struct irq_info *info;
-
- list_for_each_entry(info, &xen_irq_list_head, list) {
- if (info->type != IRQT_PIRQ)
- continue;
-
- if (info->u.pirq.gsi == gsi)
- return info->irq;
- }
-
- return -1;
-}
-EXPORT_SYMBOL_GPL(xen_irq_from_gsi);
-
-/*
- * Do not make any assumptions regarding the relationship between the
- * IRQ number returned here and the Xen pirq argument.
- *
- * Note: We don't assign an event channel until the irq actually started
- * up. Return an existing irq if we've already got one for the gsi.
- *
- * Shareable implies level triggered, not shareable implies edge
- * triggered here.
- */
-int xen_bind_pirq_gsi_to_irq(unsigned gsi,
- unsigned pirq, int shareable, char *name)
-{
- int irq = -1;
- struct physdev_irq irq_op;
-
- mutex_lock(&irq_mapping_update_lock);
-
- irq = xen_irq_from_gsi(gsi);
- if (irq != -1) {
- pr_info("%s: returning irq %d for gsi %u\n",
- __func__, irq, gsi);
- goto out;
- }
-
- irq = xen_allocate_irq_gsi(gsi);
- if (irq < 0)
- goto out;
-
- irq_op.irq = irq;
- irq_op.vector = 0;
-
- /* Only the privileged domain can do this. For non-priv, the pcifront
- * driver provides a PCI bus that does the call to do exactly
- * this in the priv domain. */
- if (xen_initial_domain() &&
- HYPERVISOR_physdev_op(PHYSDEVOP_alloc_irq_vector, &irq_op)) {
- xen_free_irq(irq);
- irq = -ENOSPC;
- goto out;
- }
-
- xen_irq_info_pirq_init(irq, 0, pirq, gsi, DOMID_SELF,
- shareable ? PIRQ_SHAREABLE : 0);
-
- pirq_query_unmask(irq);
- /* We try to use the handler with the appropriate semantic for the
- * type of interrupt: if the interrupt is an edge triggered
- * interrupt we use handle_edge_irq.
- *
- * On the other hand if the interrupt is level triggered we use
- * handle_fasteoi_irq like the native code does for this kind of
- * interrupts.
- *
- * Depending on the Xen version, pirq_needs_eoi might return true
- * not only for level triggered interrupts but for edge triggered
- * interrupts too. In any case Xen always honors the eoi mechanism,
- * not injecting any more pirqs of the same kind if the first one
- * hasn't received an eoi yet. Therefore using the fasteoi handler
- * is the right choice either way.
- */
- if (shareable)
- irq_set_chip_and_handler_name(irq, &xen_pirq_chip,
- handle_fasteoi_irq, name);
- else
- irq_set_chip_and_handler_name(irq, &xen_pirq_chip,
- handle_edge_irq, name);
-
-out:
- mutex_unlock(&irq_mapping_update_lock);
-
- return irq;
-}
-
-#ifdef CONFIG_PCI_MSI
-int xen_allocate_pirq_msi(struct pci_dev *dev, struct msi_desc *msidesc)
-{
- int rc;
- struct physdev_get_free_pirq op_get_free_pirq;
-
- op_get_free_pirq.type = MAP_PIRQ_TYPE_MSI;
- rc = HYPERVISOR_physdev_op(PHYSDEVOP_get_free_pirq, &op_get_free_pirq);
-
- WARN_ONCE(rc == -ENOSYS,
- "hypervisor does not support the PHYSDEVOP_get_free_pirq interface\n");
-
- return rc ? -1 : op_get_free_pirq.pirq;
-}
-
-int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc,
- int pirq, const char *name, domid_t domid)
-{
- int irq, ret;
-
- mutex_lock(&irq_mapping_update_lock);
-
- irq = xen_allocate_irq_dynamic();
- if (irq < 0)
- goto out;
-
- irq_set_chip_and_handler_name(irq, &xen_pirq_chip, handle_edge_irq,
- name);
-
- xen_irq_info_pirq_init(irq, 0, pirq, 0, domid, 0);
- ret = irq_set_msi_desc(irq, msidesc);
- if (ret < 0)
- goto error_irq;
-out:
- mutex_unlock(&irq_mapping_update_lock);
- return irq;
-error_irq:
- mutex_unlock(&irq_mapping_update_lock);
- xen_free_irq(irq);
- return ret;
-}
-#endif
-
-int xen_destroy_irq(int irq)
-{
- struct irq_desc *desc;
- struct physdev_unmap_pirq unmap_irq;
- struct irq_info *info = info_for_irq(irq);
- int rc = -ENOENT;
-
- mutex_lock(&irq_mapping_update_lock);
-
- desc = irq_to_desc(irq);
- if (!desc)
- goto out;
-
- if (xen_initial_domain()) {
- unmap_irq.pirq = info->u.pirq.pirq;
- unmap_irq.domid = info->u.pirq.domid;
- rc = HYPERVISOR_physdev_op(PHYSDEVOP_unmap_pirq, &unmap_irq);
- /* If another domain quits without making the pci_disable_msix
- * call, the Xen hypervisor takes care of freeing the PIRQs
- * (free_domain_pirqs).
- */
- if ((rc == -ESRCH && info->u.pirq.domid != DOMID_SELF))
- pr_info("domain %d does not have %d anymore\n",
- info->u.pirq.domid, info->u.pirq.pirq);
- else if (rc) {
- pr_warn("unmap irq failed %d\n", rc);
- goto out;
- }
- }
-
- xen_free_irq(irq);
-
-out:
- mutex_unlock(&irq_mapping_update_lock);
- return rc;
-}
-
-int xen_irq_from_pirq(unsigned pirq)
-{
- int irq;
-
- struct irq_info *info;
-
- mutex_lock(&irq_mapping_update_lock);
-
- list_for_each_entry(info, &xen_irq_list_head, list) {
- if (info->type != IRQT_PIRQ)
- continue;
- irq = info->irq;
- if (info->u.pirq.pirq == pirq)
- goto out;
- }
- irq = -1;
-out:
- mutex_unlock(&irq_mapping_update_lock);
-
- return irq;
-}
-
-
-int xen_pirq_from_irq(unsigned irq)
-{
- return pirq_from_irq(irq);
-}
-EXPORT_SYMBOL_GPL(xen_pirq_from_irq);
-int bind_evtchn_to_irq(unsigned int evtchn)
-{
- int irq;
-
- mutex_lock(&irq_mapping_update_lock);
-
- irq = evtchn_to_irq[evtchn];
-
- if (irq == -1) {
- irq = xen_allocate_irq_dynamic();
- if (irq < 0)
- goto out;
-
- irq_set_chip_and_handler_name(irq, &xen_dynamic_chip,
- handle_edge_irq, "event");
-
- xen_irq_info_evtchn_init(irq, evtchn);
- } else {
- struct irq_info *info = info_for_irq(irq);
- WARN_ON(info == NULL || info->type != IRQT_EVTCHN);
- }
-
-out:
- mutex_unlock(&irq_mapping_update_lock);
-
- return irq;
-}
-EXPORT_SYMBOL_GPL(bind_evtchn_to_irq);
-
-static int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu)
-{
- struct evtchn_bind_ipi bind_ipi;
- int evtchn, irq;
-
- mutex_lock(&irq_mapping_update_lock);
-
- irq = per_cpu(ipi_to_irq, cpu)[ipi];
-
- if (irq == -1) {
- irq = xen_allocate_irq_dynamic();
- if (irq < 0)
- goto out;
-
- irq_set_chip_and_handler_name(irq, &xen_percpu_chip,
- handle_percpu_irq, "ipi");
-
- bind_ipi.vcpu = cpu;
- if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi,
- &bind_ipi) != 0)
- BUG();
- evtchn = bind_ipi.port;
-
- xen_irq_info_ipi_init(cpu, irq, evtchn, ipi);
-
- bind_evtchn_to_cpu(evtchn, cpu);
- } else {
- struct irq_info *info = info_for_irq(irq);
- WARN_ON(info == NULL || info->type != IRQT_IPI);
- }
-
- out:
- mutex_unlock(&irq_mapping_update_lock);
- return irq;
-}
-
-static int bind_interdomain_evtchn_to_irq(unsigned int remote_domain,
- unsigned int remote_port)
-{
- struct evtchn_bind_interdomain bind_interdomain;
- int err;
-
- bind_interdomain.remote_dom = remote_domain;
- bind_interdomain.remote_port = remote_port;
-
- err = HYPERVISOR_event_channel_op(EVTCHNOP_bind_interdomain,
- &bind_interdomain);
-
- return err ? : bind_evtchn_to_irq(bind_interdomain.local_port);
-}
-
-static int find_virq(unsigned int virq, unsigned int cpu)
-{
- struct evtchn_status status;
- int port, rc = -ENOENT;
-
- memset(&status, 0, sizeof(status));
- for (port = 0; port <= NR_EVENT_CHANNELS; port++) {
- status.dom = DOMID_SELF;
- status.port = port;
- rc = HYPERVISOR_event_channel_op(EVTCHNOP_status, &status);
- if (rc < 0)
- continue;
- if (status.status != EVTCHNSTAT_virq)
- continue;
- if (status.u.virq == virq && status.vcpu == cpu) {
- rc = port;
- break;
- }
- }
- return rc;
-}
-
-int bind_virq_to_irq(unsigned int virq, unsigned int cpu)
-{
- struct evtchn_bind_virq bind_virq;
- int evtchn, irq, ret;
-
- mutex_lock(&irq_mapping_update_lock);
-
- irq = per_cpu(virq_to_irq, cpu)[virq];
-
- if (irq == -1) {
- irq = xen_allocate_irq_dynamic();
- if (irq < 0)
- goto out;
-
- irq_set_chip_and_handler_name(irq, &xen_percpu_chip,
- handle_percpu_irq, "virq");
-
- bind_virq.virq = virq;
- bind_virq.vcpu = cpu;
- ret = HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq,
- &bind_virq);
- if (ret == 0)
- evtchn = bind_virq.port;
- else {
- if (ret == -EEXIST)
- ret = find_virq(virq, cpu);
- BUG_ON(ret < 0);
- evtchn = ret;
- }
-
- xen_irq_info_virq_init(cpu, irq, evtchn, virq);
-
- bind_evtchn_to_cpu(evtchn, cpu);
- } else {
- struct irq_info *info = info_for_irq(irq);
- WARN_ON(info == NULL || info->type != IRQT_VIRQ);
- }
-
-out:
- mutex_unlock(&irq_mapping_update_lock);
-
- return irq;
-}
-
-static void unbind_from_irq(unsigned int irq)
-{
- struct evtchn_close close;
- int evtchn = evtchn_from_irq(irq);
- struct irq_info *info = irq_get_handler_data(irq);
-
- if (WARN_ON(!info))
- return;
-
- mutex_lock(&irq_mapping_update_lock);
-
- if (info->refcnt > 0) {
- info->refcnt--;
- if (info->refcnt != 0)
- goto done;
- }
-
- if (VALID_EVTCHN(evtchn)) {
- close.port = evtchn;
- if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0)
- BUG();
-
- switch (type_from_irq(irq)) {
- case IRQT_VIRQ:
- per_cpu(virq_to_irq, cpu_from_evtchn(evtchn))
- [virq_from_irq(irq)] = -1;
- break;
- case IRQT_IPI:
- per_cpu(ipi_to_irq, cpu_from_evtchn(evtchn))
- [ipi_from_irq(irq)] = -1;
- break;
- default:
- break;
- }
-
- /* Closed ports are implicitly re-bound to VCPU0. */
- bind_evtchn_to_cpu(evtchn, 0);
-
- evtchn_to_irq[evtchn] = -1;
- }
-
- BUG_ON(info_for_irq(irq)->type == IRQT_UNBOUND);
-
- xen_free_irq(irq);
-
- done:
- mutex_unlock(&irq_mapping_update_lock);
-}
-
-int bind_evtchn_to_irqhandler(unsigned int evtchn,
- irq_handler_t handler,
- unsigned long irqflags,
- const char *devname, void *dev_id)
-{
- int irq, retval;
-
- irq = bind_evtchn_to_irq(evtchn);
- if (irq < 0)
- return irq;
- retval = request_irq(irq, handler, irqflags, devname, dev_id);
- if (retval != 0) {
- unbind_from_irq(irq);
- return retval;
- }
-
- return irq;
-}
-EXPORT_SYMBOL_GPL(bind_evtchn_to_irqhandler);
-
-int bind_interdomain_evtchn_to_irqhandler(unsigned int remote_domain,
- unsigned int remote_port,
- irq_handler_t handler,
- unsigned long irqflags,
- const char *devname,
- void *dev_id)
-{
- int irq, retval;
-
- irq = bind_interdomain_evtchn_to_irq(remote_domain, remote_port);
- if (irq < 0)
- return irq;
-
- retval = request_irq(irq, handler, irqflags, devname, dev_id);
- if (retval != 0) {
- unbind_from_irq(irq);
- return retval;
- }
-
- return irq;
-}
-EXPORT_SYMBOL_GPL(bind_interdomain_evtchn_to_irqhandler);
-
-int bind_virq_to_irqhandler(unsigned int virq, unsigned int cpu,
- irq_handler_t handler,
- unsigned long irqflags, const char *devname, void *dev_id)
-{
- int irq, retval;
-
- irq = bind_virq_to_irq(virq, cpu);
- if (irq < 0)
- return irq;
- retval = request_irq(irq, handler, irqflags, devname, dev_id);
- if (retval != 0) {
- unbind_from_irq(irq);
- return retval;
- }
-
- return irq;
-}
-EXPORT_SYMBOL_GPL(bind_virq_to_irqhandler);
-
-int bind_ipi_to_irqhandler(enum ipi_vector ipi,
- unsigned int cpu,
- irq_handler_t handler,
- unsigned long irqflags,
- const char *devname,
- void *dev_id)
-{
- int irq, retval;
-
- irq = bind_ipi_to_irq(ipi, cpu);
- if (irq < 0)
- return irq;
-
- irqflags |= IRQF_NO_SUSPEND | IRQF_FORCE_RESUME | IRQF_EARLY_RESUME;
- retval = request_irq(irq, handler, irqflags, devname, dev_id);
- if (retval != 0) {
- unbind_from_irq(irq);
- return retval;
- }
-
- return irq;
-}
-
-void unbind_from_irqhandler(unsigned int irq, void *dev_id)
-{
- struct irq_info *info = irq_get_handler_data(irq);
-
- if (WARN_ON(!info))
- return;
- free_irq(irq, dev_id);
- unbind_from_irq(irq);
-}
-EXPORT_SYMBOL_GPL(unbind_from_irqhandler);
-
-int evtchn_make_refcounted(unsigned int evtchn)
-{
- int irq = evtchn_to_irq[evtchn];
- struct irq_info *info;
-
- if (irq == -1)
- return -ENOENT;
-
- info = irq_get_handler_data(irq);
-
- if (!info)
- return -ENOENT;
-
- WARN_ON(info->refcnt != -1);
-
- info->refcnt = 1;
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(evtchn_make_refcounted);
-
-int evtchn_get(unsigned int evtchn)
-{
- int irq;
- struct irq_info *info;
- int err = -ENOENT;
-
- if (evtchn >= NR_EVENT_CHANNELS)
- return -EINVAL;
-
- mutex_lock(&irq_mapping_update_lock);
-
- irq = evtchn_to_irq[evtchn];
- if (irq == -1)
- goto done;
-
- info = irq_get_handler_data(irq);
-
- if (!info)
- goto done;
-
- err = -EINVAL;
- if (info->refcnt <= 0)
- goto done;
-
- info->refcnt++;
- err = 0;
- done:
- mutex_unlock(&irq_mapping_update_lock);
-
- return err;
-}
-EXPORT_SYMBOL_GPL(evtchn_get);
-
-void evtchn_put(unsigned int evtchn)
-{
- int irq = evtchn_to_irq[evtchn];
- if (WARN_ON(irq == -1))
- return;
- unbind_from_irq(irq);
-}
-EXPORT_SYMBOL_GPL(evtchn_put);
-
-void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector)
-{
- int irq;
-
-#ifdef CONFIG_X86
- if (unlikely(vector == XEN_NMI_VECTOR)) {
- int rc = HYPERVISOR_vcpu_op(VCPUOP_send_nmi, cpu, NULL);
- if (rc < 0)
- printk(KERN_WARNING "Sending nmi to CPU%d failed (rc:%d)\n", cpu, rc);
- return;
- }
-#endif
- irq = per_cpu(ipi_to_irq, cpu)[vector];
- BUG_ON(irq < 0);
- notify_remote_via_irq(irq);
-}
-
-irqreturn_t xen_debug_interrupt(int irq, void *dev_id)
-{
- struct shared_info *sh = HYPERVISOR_shared_info;
- int cpu = smp_processor_id();
- xen_ulong_t *cpu_evtchn = per_cpu(cpu_evtchn_mask, cpu);
- int i;
- unsigned long flags;
- static DEFINE_SPINLOCK(debug_lock);
- struct vcpu_info *v;
-
- spin_lock_irqsave(&debug_lock, flags);
-
- printk("\nvcpu %d\n ", cpu);
-
- for_each_online_cpu(i) {
- int pending;
- v = per_cpu(xen_vcpu, i);
- pending = (get_irq_regs() && i == cpu)
- ? xen_irqs_disabled(get_irq_regs())
- : v->evtchn_upcall_mask;
- printk("%d: masked=%d pending=%d event_sel %0*"PRI_xen_ulong"\n ", i,
- pending, v->evtchn_upcall_pending,
- (int)(sizeof(v->evtchn_pending_sel)*2),
- v->evtchn_pending_sel);
- }
- v = per_cpu(xen_vcpu, cpu);
-
- printk("\npending:\n ");
- for (i = ARRAY_SIZE(sh->evtchn_pending)-1; i >= 0; i--)
- printk("%0*"PRI_xen_ulong"%s",
- (int)sizeof(sh->evtchn_pending[0])*2,
- sh->evtchn_pending[i],
- i % 8 == 0 ? "\n " : " ");
- printk("\nglobal mask:\n ");
- for (i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--)
- printk("%0*"PRI_xen_ulong"%s",
- (int)(sizeof(sh->evtchn_mask[0])*2),
- sh->evtchn_mask[i],
- i % 8 == 0 ? "\n " : " ");
-
- printk("\nglobally unmasked:\n ");
- for (i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--)
- printk("%0*"PRI_xen_ulong"%s",
- (int)(sizeof(sh->evtchn_mask[0])*2),
- sh->evtchn_pending[i] & ~sh->evtchn_mask[i],
- i % 8 == 0 ? "\n " : " ");
-
- printk("\nlocal cpu%d mask:\n ", cpu);
- for (i = (NR_EVENT_CHANNELS/BITS_PER_EVTCHN_WORD)-1; i >= 0; i--)
- printk("%0*"PRI_xen_ulong"%s", (int)(sizeof(cpu_evtchn[0])*2),
- cpu_evtchn[i],
- i % 8 == 0 ? "\n " : " ");
-
- printk("\nlocally unmasked:\n ");
- for (i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--) {
- xen_ulong_t pending = sh->evtchn_pending[i]
- & ~sh->evtchn_mask[i]
- & cpu_evtchn[i];
- printk("%0*"PRI_xen_ulong"%s",
- (int)(sizeof(sh->evtchn_mask[0])*2),
- pending, i % 8 == 0 ? "\n " : " ");
- }
-
- printk("\npending list:\n");
- for (i = 0; i < NR_EVENT_CHANNELS; i++) {
- if (sync_test_bit(i, BM(sh->evtchn_pending))) {
- int word_idx = i / BITS_PER_EVTCHN_WORD;
- printk(" %d: event %d -> irq %d%s%s%s\n",
- cpu_from_evtchn(i), i,
- evtchn_to_irq[i],
- sync_test_bit(word_idx, BM(&v->evtchn_pending_sel))
- ? "" : " l2-clear",
- !sync_test_bit(i, BM(sh->evtchn_mask))
- ? "" : " globally-masked",
- sync_test_bit(i, BM(cpu_evtchn))
- ? "" : " locally-masked");
- }
- }
-
- spin_unlock_irqrestore(&debug_lock, flags);
-
- return IRQ_HANDLED;
-}
-
-static DEFINE_PER_CPU(unsigned, xed_nesting_count);
-static DEFINE_PER_CPU(unsigned int, current_word_idx);
-static DEFINE_PER_CPU(unsigned int, current_bit_idx);
-
-/*
- * Mask out the i least significant bits of w
- */
-#define MASK_LSBS(w, i) (w & ((~((xen_ulong_t)0UL)) << i))
-
-/*
- * Search the CPUs pending events bitmasks. For each one found, map
- * the event number to an irq, and feed it into do_IRQ() for
- * handling.
- *
- * Xen uses a two-level bitmap to speed searching. The first level is
- * a bitset of words which contain pending event bits. The second
- * level is a bitset of pending events themselves.
- */
-static void __xen_evtchn_do_upcall(void)
-{
- int start_word_idx, start_bit_idx;
- int word_idx, bit_idx;
- int i, irq;
- int cpu = get_cpu();
- struct shared_info *s = HYPERVISOR_shared_info;
- struct vcpu_info *vcpu_info = __this_cpu_read(xen_vcpu);
- unsigned count;
-
- do {
- xen_ulong_t pending_words;
- xen_ulong_t pending_bits;
- struct irq_desc *desc;
-
- vcpu_info->evtchn_upcall_pending = 0;
-
- if (__this_cpu_inc_return(xed_nesting_count) - 1)
- goto out;
-
- /*
- * Master flag must be cleared /before/ clearing
- * selector flag. xchg_xen_ulong must contain an
- * appropriate barrier.
- */
- if ((irq = per_cpu(virq_to_irq, cpu)[VIRQ_TIMER]) != -1) {
- int evtchn = evtchn_from_irq(irq);
- word_idx = evtchn / BITS_PER_LONG;
- pending_bits = evtchn % BITS_PER_LONG;
- if (active_evtchns(cpu, s, word_idx) & (1ULL << pending_bits)) {
- desc = irq_to_desc(irq);
- if (desc)
- generic_handle_irq_desc(irq, desc);
- }
- }
-
- pending_words = xchg_xen_ulong(&vcpu_info->evtchn_pending_sel, 0);
-
- start_word_idx = __this_cpu_read(current_word_idx);
- start_bit_idx = __this_cpu_read(current_bit_idx);
-
- word_idx = start_word_idx;
-
- for (i = 0; pending_words != 0; i++) {
- xen_ulong_t words;
-
- words = MASK_LSBS(pending_words, word_idx);
-
- /*
- * If we masked out all events, wrap to beginning.
- */
- if (words == 0) {
- word_idx = 0;
- bit_idx = 0;
- continue;
- }
- word_idx = EVTCHN_FIRST_BIT(words);
-
- pending_bits = active_evtchns(cpu, s, word_idx);
- bit_idx = 0; /* usually scan entire word from start */
- /*
- * We scan the starting word in two parts.
- *
- * 1st time: start in the middle, scanning the
- * upper bits.
- *
- * 2nd time: scan the whole word (not just the
- * parts skipped in the first pass) -- if an
- * event in the previously scanned bits is
- * pending again it would just be scanned on
- * the next loop anyway.
- */
- if (word_idx == start_word_idx) {
- if (i == 0)
- bit_idx = start_bit_idx;
- }
-
- do {
- xen_ulong_t bits;
- int port;
-
- bits = MASK_LSBS(pending_bits, bit_idx);
-
- /* If we masked out all events, move on. */
- if (bits == 0)
- break;
-
- bit_idx = EVTCHN_FIRST_BIT(bits);
-
- /* Process port. */
- port = (word_idx * BITS_PER_EVTCHN_WORD) + bit_idx;
- irq = evtchn_to_irq[port];
-
- if (irq != -1) {
- desc = irq_to_desc(irq);
- if (desc)
- generic_handle_irq_desc(irq, desc);
- }
-
- bit_idx = (bit_idx + 1) % BITS_PER_EVTCHN_WORD;
-
- /* Next caller starts at last processed + 1 */
- __this_cpu_write(current_word_idx,
- bit_idx ? word_idx :
- (word_idx+1) % BITS_PER_EVTCHN_WORD);
- __this_cpu_write(current_bit_idx, bit_idx);
- } while (bit_idx != 0);
-
- /* Scan start_l1i twice; all others once. */
- if ((word_idx != start_word_idx) || (i != 0))
- pending_words &= ~(1UL << word_idx);
-
- word_idx = (word_idx + 1) % BITS_PER_EVTCHN_WORD;
- }
-
- BUG_ON(!irqs_disabled());
-
- count = __this_cpu_read(xed_nesting_count);
- __this_cpu_write(xed_nesting_count, 0);
- } while (count != 1 || vcpu_info->evtchn_upcall_pending);
-
-out:
-
- put_cpu();
-}
-
-void xen_evtchn_do_upcall(struct pt_regs *regs)
-{
- struct pt_regs *old_regs = set_irq_regs(regs);
-
- irq_enter();
-#ifdef CONFIG_X86
- exit_idle();
-#endif
-
- __xen_evtchn_do_upcall();
-
- irq_exit();
- set_irq_regs(old_regs);
-}
-
-void xen_hvm_evtchn_do_upcall(void)
-{
- __xen_evtchn_do_upcall();
-}
-EXPORT_SYMBOL_GPL(xen_hvm_evtchn_do_upcall);
-
-/* Rebind a new event channel to an existing irq. */
-void rebind_evtchn_irq(int evtchn, int irq)
-{
- struct irq_info *info = info_for_irq(irq);
-
- if (WARN_ON(!info))
- return;
-
- /* Make sure the irq is masked, since the new event channel
- will also be masked. */
- disable_irq(irq);
-
- mutex_lock(&irq_mapping_update_lock);
-
- /* After resume the irq<->evtchn mappings are all cleared out */
- BUG_ON(evtchn_to_irq[evtchn] != -1);
- /* Expect irq to have been bound before,
- so there should be a proper type */
- BUG_ON(info->type == IRQT_UNBOUND);
-
- xen_irq_info_evtchn_init(irq, evtchn);
-
- mutex_unlock(&irq_mapping_update_lock);
-
- /* new event channels are always bound to cpu 0 */
- irq_set_affinity(irq, cpumask_of(0));
-
- /* Unmask the event channel. */
- enable_irq(irq);
-}
-
-/* Rebind an evtchn so that it gets delivered to a specific cpu */
-static int rebind_irq_to_cpu(unsigned irq, unsigned tcpu)
-{
- struct evtchn_bind_vcpu bind_vcpu;
- int evtchn = evtchn_from_irq(irq);
- int masked;
-
- if (!VALID_EVTCHN(evtchn))
- return -1;
-
- /*
- * Events delivered via platform PCI interrupts are always
- * routed to vcpu 0 and hence cannot be rebound.
- */
- if (xen_hvm_domain() && !xen_have_vector_callback)
- return -1;
-
- /* Send future instances of this interrupt to other vcpu. */
- bind_vcpu.port = evtchn;
- bind_vcpu.vcpu = tcpu;
-
- /*
- * Mask the event while changing the VCPU binding to prevent
- * it being delivered on an unexpected VCPU.
- */
- masked = test_and_set_mask(evtchn);
-
- /*
- * If this fails, it usually just indicates that we're dealing with a
- * virq or IPI channel, which don't actually need to be rebound. Ignore
- * it, but don't do the xenlinux-level rebind in that case.
- */
- if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_vcpu, &bind_vcpu) >= 0)
- bind_evtchn_to_cpu(evtchn, tcpu);
-
- if (!masked)
- unmask_evtchn(evtchn);
-
- return 0;
-}
-
-static int set_affinity_irq(struct irq_data *data, const struct cpumask *dest,
- bool force)
-{
- unsigned tcpu = cpumask_first(dest);
-
- return rebind_irq_to_cpu(data->irq, tcpu);
-}
-
-static int retrigger_evtchn(int evtchn)
-{
- int masked;
-
- if (!VALID_EVTCHN(evtchn))
- return 0;
-
- masked = test_and_set_mask(evtchn);
- set_evtchn(evtchn);
- if (!masked)
- unmask_evtchn(evtchn);
-
- return 1;
-}
-
-int resend_irq_on_evtchn(unsigned int irq)
-{
- return retrigger_evtchn(evtchn_from_irq(irq));
-}
-
-static void enable_dynirq(struct irq_data *data)
-{
- int evtchn = evtchn_from_irq(data->irq);
-
- if (VALID_EVTCHN(evtchn))
- unmask_evtchn(evtchn);
-}
-
-static void disable_dynirq(struct irq_data *data)
-{
- int evtchn = evtchn_from_irq(data->irq);
-
- if (VALID_EVTCHN(evtchn))
- mask_evtchn(evtchn);
-}
-
-static void ack_dynirq(struct irq_data *data)
-{
- int evtchn = evtchn_from_irq(data->irq);
-
- irq_move_irq(data);
-
- if (VALID_EVTCHN(evtchn))
- clear_evtchn(evtchn);
-}
-
-static void mask_ack_dynirq(struct irq_data *data)
-{
- disable_dynirq(data);
- ack_dynirq(data);
-}
-
-static int retrigger_dynirq(struct irq_data *data)
-{
- return retrigger_evtchn(evtchn_from_irq(data->irq));
-}
-
-static void restore_pirqs(void)
-{
- int pirq, rc, irq, gsi;
- struct physdev_map_pirq map_irq;
- struct irq_info *info;
-
- list_for_each_entry(info, &xen_irq_list_head, list) {
- if (info->type != IRQT_PIRQ)
- continue;
-
- pirq = info->u.pirq.pirq;
- gsi = info->u.pirq.gsi;
- irq = info->irq;
-
- /* save/restore of PT devices doesn't work, so at this point the
- * only devices present are GSI based emulated devices */
- if (!gsi)
- continue;
-
- map_irq.domid = DOMID_SELF;
- map_irq.type = MAP_PIRQ_TYPE_GSI;
- map_irq.index = gsi;
- map_irq.pirq = pirq;
-
- rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
- if (rc) {
- pr_warn("xen map irq failed gsi=%d irq=%d pirq=%d rc=%d\n",
- gsi, irq, pirq, rc);
- xen_free_irq(irq);
- continue;
- }
-
- printk(KERN_DEBUG "xen: --> irq=%d, pirq=%d\n", irq, map_irq.pirq);
-
- __startup_pirq(irq);
- }
-}
-
-static void restore_cpu_virqs(unsigned int cpu)
-{
- struct evtchn_bind_virq bind_virq;
- int virq, irq, evtchn;
-
- for (virq = 0; virq < NR_VIRQS; virq++) {
- if ((irq = per_cpu(virq_to_irq, cpu)[virq]) == -1)
- continue;
-
- BUG_ON(virq_from_irq(irq) != virq);
-
- /* Get a new binding from Xen. */
- bind_virq.virq = virq;
- bind_virq.vcpu = cpu;
- if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq,
- &bind_virq) != 0)
- BUG();
- evtchn = bind_virq.port;
-
- /* Record the new mapping. */
- xen_irq_info_virq_init(cpu, irq, evtchn, virq);
- bind_evtchn_to_cpu(evtchn, cpu);
- }
-}
-
-static void restore_cpu_ipis(unsigned int cpu)
-{
- struct evtchn_bind_ipi bind_ipi;
- int ipi, irq, evtchn;
-
- for (ipi = 0; ipi < XEN_NR_IPIS; ipi++) {
- if ((irq = per_cpu(ipi_to_irq, cpu)[ipi]) == -1)
- continue;
-
- BUG_ON(ipi_from_irq(irq) != ipi);
-
- /* Get a new binding from Xen. */
- bind_ipi.vcpu = cpu;
- if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi,
- &bind_ipi) != 0)
- BUG();
- evtchn = bind_ipi.port;
-
- /* Record the new mapping. */
- xen_irq_info_ipi_init(cpu, irq, evtchn, ipi);
- bind_evtchn_to_cpu(evtchn, cpu);
- }
-}
-
-/* Clear an irq's pending state, in preparation for polling on it */
-void xen_clear_irq_pending(int irq)
-{
- int evtchn = evtchn_from_irq(irq);
-
- if (VALID_EVTCHN(evtchn))
- clear_evtchn(evtchn);
-}
-EXPORT_SYMBOL(xen_clear_irq_pending);
-void xen_set_irq_pending(int irq)
-{
- int evtchn = evtchn_from_irq(irq);
-
- if (VALID_EVTCHN(evtchn))
- set_evtchn(evtchn);
-}
-
-bool xen_test_irq_pending(int irq)
-{
- int evtchn = evtchn_from_irq(irq);
- bool ret = false;
-
- if (VALID_EVTCHN(evtchn))
- ret = test_evtchn(evtchn);
-
- return ret;
-}
-
-/* Poll waiting for an irq to become pending with timeout. In the usual case,
- * the irq will be disabled so it won't deliver an interrupt. */
-void xen_poll_irq_timeout(int irq, u64 timeout)
-{
- evtchn_port_t evtchn = evtchn_from_irq(irq);
-
- if (VALID_EVTCHN(evtchn)) {
- struct sched_poll poll;
-
- poll.nr_ports = 1;
- poll.timeout = timeout;
- set_xen_guest_handle(poll.ports, &evtchn);
-
- if (HYPERVISOR_sched_op(SCHEDOP_poll, &poll) != 0)
- BUG();
- }
-}
-EXPORT_SYMBOL(xen_poll_irq_timeout);
-/* Poll waiting for an irq to become pending. In the usual case, the
- * irq will be disabled so it won't deliver an interrupt. */
-void xen_poll_irq(int irq)
-{
- xen_poll_irq_timeout(irq, 0 /* no timeout */);
-}
-
-/* Check whether the IRQ line is shared with other guests. */
-int xen_test_irq_shared(int irq)
-{
- struct irq_info *info = info_for_irq(irq);
- struct physdev_irq_status_query irq_status;
-
- if (WARN_ON(!info))
- return -ENOENT;
-
- irq_status.irq = info->u.pirq.pirq;
-
- if (HYPERVISOR_physdev_op(PHYSDEVOP_irq_status_query, &irq_status))
- return 0;
- return !(irq_status.flags & XENIRQSTAT_shared);
-}
-EXPORT_SYMBOL_GPL(xen_test_irq_shared);
-
-void xen_irq_resume(void)
-{
- unsigned int cpu, evtchn;
- struct irq_info *info;
-
- /* New event-channel space is not 'live' yet. */
- for (evtchn = 0; evtchn < NR_EVENT_CHANNELS; evtchn++)
- mask_evtchn(evtchn);
-
- /* No IRQ <-> event-channel mappings. */
- list_for_each_entry(info, &xen_irq_list_head, list)
- info->evtchn = 0; /* zap event-channel binding */
-
- for (evtchn = 0; evtchn < NR_EVENT_CHANNELS; evtchn++)
- evtchn_to_irq[evtchn] = -1;
-
- for_each_possible_cpu(cpu) {
- restore_cpu_virqs(cpu);
- restore_cpu_ipis(cpu);
- }
-
- restore_pirqs();
-}
-
-static struct irq_chip xen_dynamic_chip __read_mostly = {
- .name = "xen-dyn",
-
- .irq_disable = disable_dynirq,
- .irq_mask = disable_dynirq,
- .irq_unmask = enable_dynirq,
-
- .irq_ack = ack_dynirq,
- .irq_mask_ack = mask_ack_dynirq,
-
- .irq_set_affinity = set_affinity_irq,
- .irq_retrigger = retrigger_dynirq,
-};
-
-static struct irq_chip xen_pirq_chip __read_mostly = {
- .name = "xen-pirq",
-
- .irq_startup = startup_pirq,
- .irq_shutdown = shutdown_pirq,
- .irq_enable = enable_pirq,
- .irq_disable = disable_pirq,
-
- .irq_mask = disable_dynirq,
- .irq_unmask = enable_dynirq,
-
- .irq_ack = eoi_pirq,
- .irq_eoi = eoi_pirq,
- .irq_mask_ack = mask_ack_pirq,
-
- .irq_set_affinity = set_affinity_irq,
-
- .irq_retrigger = retrigger_dynirq,
-};
-
-static struct irq_chip xen_percpu_chip __read_mostly = {
- .name = "xen-percpu",
-
- .irq_disable = disable_dynirq,
- .irq_mask = disable_dynirq,
- .irq_unmask = enable_dynirq,
-
- .irq_ack = ack_dynirq,
-};
-
-int xen_set_callback_via(uint64_t via)
-{
- struct xen_hvm_param a;
- a.domid = DOMID_SELF;
- a.index = HVM_PARAM_CALLBACK_IRQ;
- a.value = via;
- return HYPERVISOR_hvm_op(HVMOP_set_param, &a);
-}
-EXPORT_SYMBOL_GPL(xen_set_callback_via);
-
-#ifdef CONFIG_XEN_PVHVM
-/* Vector callbacks are better than PCI interrupts to receive event
- * channel notifications because we can receive vector callbacks on any
- * vcpu and we don't need PCI support or APIC interactions. */
-void xen_callback_vector(void)
-{
- int rc;
- uint64_t callback_via;
- if (xen_have_vector_callback) {
- callback_via = HVM_CALLBACK_VECTOR(HYPERVISOR_CALLBACK_VECTOR);
- rc = xen_set_callback_via(callback_via);
- if (rc) {
- pr_err("Request for Xen HVM callback vector failed\n");
- xen_have_vector_callback = 0;
- return;
- }
- pr_info("Xen HVM callback vector for event delivery is enabled\n");
- /* in the restore case the vector has already been allocated */
- if (!test_bit(HYPERVISOR_CALLBACK_VECTOR, used_vectors))
- alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR,
- xen_hvm_callback_vector);
- }
-}
-#else
-void xen_callback_vector(void) {}
-#endif
-
-void __init xen_init_IRQ(void)
-{
- int i;
-
- evtchn_to_irq = kcalloc(NR_EVENT_CHANNELS, sizeof(*evtchn_to_irq),
- GFP_KERNEL);
- BUG_ON(!evtchn_to_irq);
- for (i = 0; i < NR_EVENT_CHANNELS; i++)
- evtchn_to_irq[i] = -1;
-
- /* No event channels are 'live' right now. */
- for (i = 0; i < NR_EVENT_CHANNELS; i++)
- mask_evtchn(i);
-
- pirq_needs_eoi = pirq_needs_eoi_flag;
-
-#ifdef CONFIG_X86
- if (xen_hvm_domain()) {
- xen_callback_vector();
- native_init_IRQ();
- /* pci_xen_hvm_init must be called after native_init_IRQ so that
- * __acpi_register_gsi can point at the right function */
- pci_xen_hvm_init();
- } else {
- int rc;
- struct physdev_pirq_eoi_gmfn eoi_gmfn;
-
- irq_ctx_init(smp_processor_id());
- if (xen_initial_domain())
- pci_xen_initial_domain();
-
- pirq_eoi_map = (void *)__get_free_page(GFP_KERNEL|__GFP_ZERO);
- eoi_gmfn.gmfn = virt_to_mfn(pirq_eoi_map);
- rc = HYPERVISOR_physdev_op(PHYSDEVOP_pirq_eoi_gmfn_v2, &eoi_gmfn);
- if (rc != 0) {
- free_page((unsigned long) pirq_eoi_map);
- pirq_eoi_map = NULL;
- } else
- pirq_needs_eoi = pirq_check_eoi_map;
- }
-#endif
-}
--- /dev/null
+obj-y += events.o
+
+events-y += events_base.o
--- /dev/null
+/*
+ * Xen event channels
+ *
+ * Xen models interrupts with abstract event channels. Because each
+ * domain gets 1024 event channels, but NR_IRQ is not that large, we
+ * must dynamically map irqs<->event channels. The event channels
+ * interface with the rest of the kernel by defining a xen interrupt
+ * chip. When an event is received, it is mapped to an irq and sent
+ * through the normal interrupt processing path.
+ *
+ * There are four kinds of events which can be mapped to an event
+ * channel:
+ *
+ * 1. Inter-domain notifications. This includes all the virtual
+ * device events, since they're driven by front-ends in another domain
+ * (typically dom0).
+ * 2. VIRQs, typically used for timers. These are per-cpu events.
+ * 3. IPIs.
+ * 4. PIRQs - Hardware interrupts.
+ *
+ * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
+ */
+
+#define pr_fmt(fmt) "xen:" KBUILD_MODNAME ": " fmt
+
+#include <linux/linkage.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/bootmem.h>
+#include <linux/slab.h>
+#include <linux/irqnr.h>
+#include <linux/pci.h>
+
+#ifdef CONFIG_X86
+#include <asm/desc.h>
+#include <asm/ptrace.h>
+#include <asm/irq.h>
+#include <asm/idle.h>
+#include <asm/io_apic.h>
+#include <asm/xen/page.h>
+#include <asm/xen/pci.h>
+#endif
+#include <asm/sync_bitops.h>
+#include <asm/xen/hypercall.h>
+#include <asm/xen/hypervisor.h>
+
+#include <xen/xen.h>
+#include <xen/hvm.h>
+#include <xen/xen-ops.h>
+#include <xen/events.h>
+#include <xen/interface/xen.h>
+#include <xen/interface/event_channel.h>
+#include <xen/interface/hvm/hvm_op.h>
+#include <xen/interface/hvm/params.h>
+#include <xen/interface/physdev.h>
+#include <xen/interface/sched.h>
+#include <xen/interface/vcpu.h>
+#include <asm/hw_irq.h>
+
+/*
+ * This lock protects updates to the following mapping and reference-count
+ * arrays. The lock does not need to be acquired to read the mapping tables.
+ */
+static DEFINE_MUTEX(irq_mapping_update_lock);
+
+static LIST_HEAD(xen_irq_list_head);
+
+/* IRQ <-> VIRQ mapping. */
+static DEFINE_PER_CPU(int [NR_VIRQS], virq_to_irq) = {[0 ... NR_VIRQS-1] = -1};
+
+/* IRQ <-> IPI mapping */
+static DEFINE_PER_CPU(int [XEN_NR_IPIS], ipi_to_irq) = {[0 ... XEN_NR_IPIS-1] = -1};
+
+/* Interrupt types. */
+enum xen_irq_type {
+ IRQT_UNBOUND = 0,
+ IRQT_PIRQ,
+ IRQT_VIRQ,
+ IRQT_IPI,
+ IRQT_EVTCHN
+};
+
+/*
+ * Packed IRQ information:
+ * type - enum xen_irq_type
+ * event channel - irq->event channel mapping
+ * cpu - cpu this event channel is bound to
+ * index - type-specific information:
+ * PIRQ - physical IRQ, GSI, flags, and owner domain
+ * VIRQ - virq number
+ * IPI - IPI vector
+ * EVTCHN -
+ */
+struct irq_info {
+ struct list_head list;
+ int refcnt;
+ enum xen_irq_type type; /* type */
+ unsigned irq;
+ unsigned short evtchn; /* event channel */
+ unsigned short cpu; /* cpu bound */
+
+ union {
+ unsigned short virq;
+ enum ipi_vector ipi;
+ struct {
+ unsigned short pirq;
+ unsigned short gsi;
+ unsigned char flags;
+ uint16_t domid;
+ } pirq;
+ } u;
+};
+#define PIRQ_NEEDS_EOI (1 << 0)
+#define PIRQ_SHAREABLE (1 << 1)
+
+static int *evtchn_to_irq;
+#ifdef CONFIG_X86
+static unsigned long *pirq_eoi_map;
+#endif
+static bool (*pirq_needs_eoi)(unsigned irq);
+
+/*
+ * Note sizeof(xen_ulong_t) can be more than sizeof(unsigned long). Be
+ * careful to only use bitops which allow for this (e.g
+ * test_bit/find_first_bit and friends but not __ffs) and to pass
+ * BITS_PER_EVTCHN_WORD as the bitmask length.
+ */
+#define BITS_PER_EVTCHN_WORD (sizeof(xen_ulong_t)*8)
+/*
+ * Make a bitmask (i.e. unsigned long *) of a xen_ulong_t
+ * array. Primarily to avoid long lines (hence the terse name).
+ */
+#define BM(x) (unsigned long *)(x)
+/* Find the first set bit in a evtchn mask */
+#define EVTCHN_FIRST_BIT(w) find_first_bit(BM(&(w)), BITS_PER_EVTCHN_WORD)
+
+static DEFINE_PER_CPU(xen_ulong_t [NR_EVENT_CHANNELS/BITS_PER_EVTCHN_WORD],
+ cpu_evtchn_mask);
+
+/* Xen will never allocate port zero for any purpose. */
+#define VALID_EVTCHN(chn) ((chn) != 0)
+
+static struct irq_chip xen_dynamic_chip;
+static struct irq_chip xen_percpu_chip;
+static struct irq_chip xen_pirq_chip;
+static void enable_dynirq(struct irq_data *data);
+static void disable_dynirq(struct irq_data *data);
+
+/* Get info for IRQ */
+static struct irq_info *info_for_irq(unsigned irq)
+{
+ return irq_get_handler_data(irq);
+}
+
+/* Constructors for packed IRQ information. */
+static void xen_irq_info_common_init(struct irq_info *info,
+ unsigned irq,
+ enum xen_irq_type type,
+ unsigned short evtchn,
+ unsigned short cpu)
+{
+
+ BUG_ON(info->type != IRQT_UNBOUND && info->type != type);
+
+ info->type = type;
+ info->irq = irq;
+ info->evtchn = evtchn;
+ info->cpu = cpu;
+
+ evtchn_to_irq[evtchn] = irq;
+
+ irq_clear_status_flags(irq, IRQ_NOREQUEST|IRQ_NOAUTOEN);
+}
+
+static void xen_irq_info_evtchn_init(unsigned irq,
+ unsigned short evtchn)
+{
+ struct irq_info *info = info_for_irq(irq);
+
+ xen_irq_info_common_init(info, irq, IRQT_EVTCHN, evtchn, 0);
+}
+
+static void xen_irq_info_ipi_init(unsigned cpu,
+ unsigned irq,
+ unsigned short evtchn,
+ enum ipi_vector ipi)
+{
+ struct irq_info *info = info_for_irq(irq);
+
+ xen_irq_info_common_init(info, irq, IRQT_IPI, evtchn, 0);
+
+ info->u.ipi = ipi;
+
+ per_cpu(ipi_to_irq, cpu)[ipi] = irq;
+}
+
+static void xen_irq_info_virq_init(unsigned cpu,
+ unsigned irq,
+ unsigned short evtchn,
+ unsigned short virq)
+{
+ struct irq_info *info = info_for_irq(irq);
+
+ xen_irq_info_common_init(info, irq, IRQT_VIRQ, evtchn, 0);
+
+ info->u.virq = virq;
+
+ per_cpu(virq_to_irq, cpu)[virq] = irq;
+}
+
+static void xen_irq_info_pirq_init(unsigned irq,
+ unsigned short evtchn,
+ unsigned short pirq,
+ unsigned short gsi,
+ uint16_t domid,
+ unsigned char flags)
+{
+ struct irq_info *info = info_for_irq(irq);
+
+ xen_irq_info_common_init(info, irq, IRQT_PIRQ, evtchn, 0);
+
+ info->u.pirq.pirq = pirq;
+ info->u.pirq.gsi = gsi;
+ info->u.pirq.domid = domid;
+ info->u.pirq.flags = flags;
+}
+
+/*
+ * Accessors for packed IRQ information.
+ */
+static unsigned int evtchn_from_irq(unsigned irq)
+{
+ if (unlikely(WARN(irq < 0 || irq >= nr_irqs, "Invalid irq %d!\n", irq)))
+ return 0;
+
+ return info_for_irq(irq)->evtchn;
+}
+
+unsigned irq_from_evtchn(unsigned int evtchn)
+{
+ return evtchn_to_irq[evtchn];
+}
+EXPORT_SYMBOL_GPL(irq_from_evtchn);
+
+static enum ipi_vector ipi_from_irq(unsigned irq)
+{
+ struct irq_info *info = info_for_irq(irq);
+
+ BUG_ON(info == NULL);
+ BUG_ON(info->type != IRQT_IPI);
+
+ return info->u.ipi;
+}
+
+static unsigned virq_from_irq(unsigned irq)
+{
+ struct irq_info *info = info_for_irq(irq);
+
+ BUG_ON(info == NULL);
+ BUG_ON(info->type != IRQT_VIRQ);
+
+ return info->u.virq;
+}
+
+static unsigned pirq_from_irq(unsigned irq)
+{
+ struct irq_info *info = info_for_irq(irq);
+
+ BUG_ON(info == NULL);
+ BUG_ON(info->type != IRQT_PIRQ);
+
+ return info->u.pirq.pirq;
+}
+
+static enum xen_irq_type type_from_irq(unsigned irq)
+{
+ return info_for_irq(irq)->type;
+}
+
+static unsigned cpu_from_irq(unsigned irq)
+{
+ return info_for_irq(irq)->cpu;
+}
+
+static unsigned int cpu_from_evtchn(unsigned int evtchn)
+{
+ int irq = evtchn_to_irq[evtchn];
+ unsigned ret = 0;
+
+ if (irq != -1)
+ ret = cpu_from_irq(irq);
+
+ return ret;
+}
+
+#ifdef CONFIG_X86
+static bool pirq_check_eoi_map(unsigned irq)
+{
+ return test_bit(pirq_from_irq(irq), pirq_eoi_map);
+}
+#endif
+
+static bool pirq_needs_eoi_flag(unsigned irq)
+{
+ struct irq_info *info = info_for_irq(irq);
+ BUG_ON(info->type != IRQT_PIRQ);
+
+ return info->u.pirq.flags & PIRQ_NEEDS_EOI;
+}
+
+static inline xen_ulong_t active_evtchns(unsigned int cpu,
+ struct shared_info *sh,
+ unsigned int idx)
+{
+ return sh->evtchn_pending[idx] &
+ per_cpu(cpu_evtchn_mask, cpu)[idx] &
+ ~sh->evtchn_mask[idx];
+}
+
+static void bind_evtchn_to_cpu(unsigned int chn, unsigned int cpu)
+{
+ int irq = evtchn_to_irq[chn];
+
+ BUG_ON(irq == -1);
+#ifdef CONFIG_SMP
+ cpumask_copy(irq_to_desc(irq)->irq_data.affinity, cpumask_of(cpu));
+#endif
+
+ clear_bit(chn, BM(per_cpu(cpu_evtchn_mask, cpu_from_irq(irq))));
+ set_bit(chn, BM(per_cpu(cpu_evtchn_mask, cpu)));
+
+ info_for_irq(irq)->cpu = cpu;
+}
+
+static inline void clear_evtchn(int port)
+{
+ struct shared_info *s = HYPERVISOR_shared_info;
+ sync_clear_bit(port, BM(&s->evtchn_pending[0]));
+}
+
+static inline void set_evtchn(int port)
+{
+ struct shared_info *s = HYPERVISOR_shared_info;
+ sync_set_bit(port, BM(&s->evtchn_pending[0]));
+}
+
+static inline int test_evtchn(int port)
+{
+ struct shared_info *s = HYPERVISOR_shared_info;
+ return sync_test_bit(port, BM(&s->evtchn_pending[0]));
+}
+
+static inline int test_and_set_mask(int port)
+{
+ struct shared_info *s = HYPERVISOR_shared_info;
+ return sync_test_and_set_bit(port, BM(&s->evtchn_mask[0]));
+}
+
+
+/**
+ * notify_remote_via_irq - send event to remote end of event channel via irq
+ * @irq: irq of event channel to send event to
+ *
+ * Unlike notify_remote_via_evtchn(), this is safe to use across
+ * save/restore. Notifications on a broken connection are silently
+ * dropped.
+ */
+void notify_remote_via_irq(int irq)
+{
+ int evtchn = evtchn_from_irq(irq);
+
+ if (VALID_EVTCHN(evtchn))
+ notify_remote_via_evtchn(evtchn);
+}
+EXPORT_SYMBOL_GPL(notify_remote_via_irq);
+
+static void mask_evtchn(int port)
+{
+ struct shared_info *s = HYPERVISOR_shared_info;
+ sync_set_bit(port, BM(&s->evtchn_mask[0]));
+}
+
+static void unmask_evtchn(int port)
+{
+ struct shared_info *s = HYPERVISOR_shared_info;
+ unsigned int cpu = get_cpu();
+ int do_hypercall = 0, evtchn_pending = 0;
+
+ BUG_ON(!irqs_disabled());
+
+ if (unlikely((cpu != cpu_from_evtchn(port))))
+ do_hypercall = 1;
+ else {
+ /*
+ * Need to clear the mask before checking pending to
+ * avoid a race with an event becoming pending.
+ *
+ * EVTCHNOP_unmask will only trigger an upcall if the
+ * mask bit was set, so if a hypercall is needed
+ * remask the event.
+ */
+ sync_clear_bit(port, BM(&s->evtchn_mask[0]));
+ evtchn_pending = sync_test_bit(port, BM(&s->evtchn_pending[0]));
+
+ if (unlikely(evtchn_pending && xen_hvm_domain())) {
+ sync_set_bit(port, BM(&s->evtchn_mask[0]));
+ do_hypercall = 1;
+ }
+ }
+
+ /* Slow path (hypercall) if this is a non-local port or if this is
+ * an hvm domain and an event is pending (hvm domains don't have
+ * their own implementation of irq_enable). */
+ if (do_hypercall) {
+ struct evtchn_unmask unmask = { .port = port };
+ (void)HYPERVISOR_event_channel_op(EVTCHNOP_unmask, &unmask);
+ } else {
+ struct vcpu_info *vcpu_info = __this_cpu_read(xen_vcpu);
+
+ /*
+ * The following is basically the equivalent of
+ * 'hw_resend_irq'. Just like a real IO-APIC we 'lose
+ * the interrupt edge' if the channel is masked.
+ */
+ if (evtchn_pending &&
+ !sync_test_and_set_bit(port / BITS_PER_EVTCHN_WORD,
+ BM(&vcpu_info->evtchn_pending_sel)))
+ vcpu_info->evtchn_upcall_pending = 1;
+ }
+
+ put_cpu();
+}
+
+static void xen_irq_init(unsigned irq)
+{
+ struct irq_info *info;
+#ifdef CONFIG_SMP
+ struct irq_desc *desc = irq_to_desc(irq);
+
+ /* By default all event channels notify CPU#0. */
+ cpumask_copy(desc->irq_data.affinity, cpumask_of(0));
+#endif
+
+ info = kzalloc(sizeof(*info), GFP_KERNEL);
+ if (info == NULL)
+ panic("Unable to allocate metadata for IRQ%d\n", irq);
+
+ info->type = IRQT_UNBOUND;
+ info->refcnt = -1;
+
+ irq_set_handler_data(irq, info);
+
+ list_add_tail(&info->list, &xen_irq_list_head);
+}
+
+static int __must_check xen_allocate_irq_dynamic(void)
+{
+ int first = 0;
+ int irq;
+
+#ifdef CONFIG_X86_IO_APIC
+ /*
+ * For an HVM guest or domain 0 which see "real" (emulated or
+ * actual respectively) GSIs we allocate dynamic IRQs
+ * e.g. those corresponding to event channels or MSIs
+ * etc. from the range above those "real" GSIs to avoid
+ * collisions.
+ */
+ if (xen_initial_domain() || xen_hvm_domain())
+ first = get_nr_irqs_gsi();
+#endif
+
+ irq = irq_alloc_desc_from(first, -1);
+
+ if (irq >= 0)
+ xen_irq_init(irq);
+
+ return irq;
+}
+
+static int __must_check xen_allocate_irq_gsi(unsigned gsi)
+{
+ int irq;
+
+ /*
+ * A PV guest has no concept of a GSI (since it has no ACPI
+ * nor access to/knowledge of the physical APICs). Therefore
+ * all IRQs are dynamically allocated from the entire IRQ
+ * space.
+ */
+ if (xen_pv_domain() && !xen_initial_domain())
+ return xen_allocate_irq_dynamic();
+
+ /* Legacy IRQ descriptors are already allocated by the arch. */
+ if (gsi < NR_IRQS_LEGACY)
+ irq = gsi;
+ else
+ irq = irq_alloc_desc_at(gsi, -1);
+
+ xen_irq_init(irq);
+
+ return irq;
+}
+
+static void xen_free_irq(unsigned irq)
+{
+ struct irq_info *info = irq_get_handler_data(irq);
+
+ if (WARN_ON(!info))
+ return;
+
+ list_del(&info->list);
+
+ irq_set_handler_data(irq, NULL);
+
+ WARN_ON(info->refcnt > 0);
+
+ kfree(info);
+
+ /* Legacy IRQ descriptors are managed by the arch. */
+ if (irq < NR_IRQS_LEGACY)
+ return;
+
+ irq_free_desc(irq);
+}
+
+static void pirq_query_unmask(int irq)
+{
+ struct physdev_irq_status_query irq_status;
+ struct irq_info *info = info_for_irq(irq);
+
+ BUG_ON(info->type != IRQT_PIRQ);
+
+ irq_status.irq = pirq_from_irq(irq);
+ if (HYPERVISOR_physdev_op(PHYSDEVOP_irq_status_query, &irq_status))
+ irq_status.flags = 0;
+
+ info->u.pirq.flags &= ~PIRQ_NEEDS_EOI;
+ if (irq_status.flags & XENIRQSTAT_needs_eoi)
+ info->u.pirq.flags |= PIRQ_NEEDS_EOI;
+}
+
+static bool probing_irq(int irq)
+{
+ struct irq_desc *desc = irq_to_desc(irq);
+
+ return desc && desc->action == NULL;
+}
+
+static void eoi_pirq(struct irq_data *data)
+{
+ int evtchn = evtchn_from_irq(data->irq);
+ struct physdev_eoi eoi = { .irq = pirq_from_irq(data->irq) };
+ int rc = 0;
+
+ irq_move_irq(data);
+
+ if (VALID_EVTCHN(evtchn))
+ clear_evtchn(evtchn);
+
+ if (pirq_needs_eoi(data->irq)) {
+ rc = HYPERVISOR_physdev_op(PHYSDEVOP_eoi, &eoi);
+ WARN_ON(rc);
+ }
+}
+
+static void mask_ack_pirq(struct irq_data *data)
+{
+ disable_dynirq(data);
+ eoi_pirq(data);
+}
+
+static unsigned int __startup_pirq(unsigned int irq)
+{
+ struct evtchn_bind_pirq bind_pirq;
+ struct irq_info *info = info_for_irq(irq);
+ int evtchn = evtchn_from_irq(irq);
+ int rc;
+
+ BUG_ON(info->type != IRQT_PIRQ);
+
+ if (VALID_EVTCHN(evtchn))
+ goto out;
+
+ bind_pirq.pirq = pirq_from_irq(irq);
+ /* NB. We are happy to share unless we are probing. */
+ bind_pirq.flags = info->u.pirq.flags & PIRQ_SHAREABLE ?
+ BIND_PIRQ__WILL_SHARE : 0;
+ rc = HYPERVISOR_event_channel_op(EVTCHNOP_bind_pirq, &bind_pirq);
+ if (rc != 0) {
+ if (!probing_irq(irq))
+ pr_info("Failed to obtain physical IRQ %d\n", irq);
+ return 0;
+ }
+ evtchn = bind_pirq.port;
+
+ pirq_query_unmask(irq);
+
+ evtchn_to_irq[evtchn] = irq;
+ bind_evtchn_to_cpu(evtchn, 0);
+ info->evtchn = evtchn;
+
+out:
+ unmask_evtchn(evtchn);
+ eoi_pirq(irq_get_irq_data(irq));
+
+ return 0;
+}
+
+static unsigned int startup_pirq(struct irq_data *data)
+{
+ return __startup_pirq(data->irq);
+}
+
+static void shutdown_pirq(struct irq_data *data)
+{
+ struct evtchn_close close;
+ unsigned int irq = data->irq;
+ struct irq_info *info = info_for_irq(irq);
+ int evtchn = evtchn_from_irq(irq);
+
+ BUG_ON(info->type != IRQT_PIRQ);
+
+ if (!VALID_EVTCHN(evtchn))
+ return;
+
+ mask_evtchn(evtchn);
+
+ close.port = evtchn;
+ if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0)
+ BUG();
+
+ bind_evtchn_to_cpu(evtchn, 0);
+ evtchn_to_irq[evtchn] = -1;
+ info->evtchn = 0;
+}
+
+static void enable_pirq(struct irq_data *data)
+{
+ startup_pirq(data);
+}
+
+static void disable_pirq(struct irq_data *data)
+{
+ disable_dynirq(data);
+}
+
+int xen_irq_from_gsi(unsigned gsi)
+{
+ struct irq_info *info;
+
+ list_for_each_entry(info, &xen_irq_list_head, list) {
+ if (info->type != IRQT_PIRQ)
+ continue;
+
+ if (info->u.pirq.gsi == gsi)
+ return info->irq;
+ }
+
+ return -1;
+}
+EXPORT_SYMBOL_GPL(xen_irq_from_gsi);
+
+/*
+ * Do not make any assumptions regarding the relationship between the
+ * IRQ number returned here and the Xen pirq argument.
+ *
+ * Note: We don't assign an event channel until the irq actually started
+ * up. Return an existing irq if we've already got one for the gsi.
+ *
+ * Shareable implies level triggered, not shareable implies edge
+ * triggered here.
+ */
+int xen_bind_pirq_gsi_to_irq(unsigned gsi,
+ unsigned pirq, int shareable, char *name)
+{
+ int irq = -1;
+ struct physdev_irq irq_op;
+
+ mutex_lock(&irq_mapping_update_lock);
+
+ irq = xen_irq_from_gsi(gsi);
+ if (irq != -1) {
+ pr_info("%s: returning irq %d for gsi %u\n",
+ __func__, irq, gsi);
+ goto out;
+ }
+
+ irq = xen_allocate_irq_gsi(gsi);
+ if (irq < 0)
+ goto out;
+
+ irq_op.irq = irq;
+ irq_op.vector = 0;
+
+ /* Only the privileged domain can do this. For non-priv, the pcifront
+ * driver provides a PCI bus that does the call to do exactly
+ * this in the priv domain. */
+ if (xen_initial_domain() &&
+ HYPERVISOR_physdev_op(PHYSDEVOP_alloc_irq_vector, &irq_op)) {
+ xen_free_irq(irq);
+ irq = -ENOSPC;
+ goto out;
+ }
+
+ xen_irq_info_pirq_init(irq, 0, pirq, gsi, DOMID_SELF,
+ shareable ? PIRQ_SHAREABLE : 0);
+
+ pirq_query_unmask(irq);
+ /* We try to use the handler with the appropriate semantic for the
+ * type of interrupt: if the interrupt is an edge triggered
+ * interrupt we use handle_edge_irq.
+ *
+ * On the other hand if the interrupt is level triggered we use
+ * handle_fasteoi_irq like the native code does for this kind of
+ * interrupts.
+ *
+ * Depending on the Xen version, pirq_needs_eoi might return true
+ * not only for level triggered interrupts but for edge triggered
+ * interrupts too. In any case Xen always honors the eoi mechanism,
+ * not injecting any more pirqs of the same kind if the first one
+ * hasn't received an eoi yet. Therefore using the fasteoi handler
+ * is the right choice either way.
+ */
+ if (shareable)
+ irq_set_chip_and_handler_name(irq, &xen_pirq_chip,
+ handle_fasteoi_irq, name);
+ else
+ irq_set_chip_and_handler_name(irq, &xen_pirq_chip,
+ handle_edge_irq, name);
+
+out:
+ mutex_unlock(&irq_mapping_update_lock);
+
+ return irq;
+}
+
+#ifdef CONFIG_PCI_MSI
+int xen_allocate_pirq_msi(struct pci_dev *dev, struct msi_desc *msidesc)
+{
+ int rc;
+ struct physdev_get_free_pirq op_get_free_pirq;
+
+ op_get_free_pirq.type = MAP_PIRQ_TYPE_MSI;
+ rc = HYPERVISOR_physdev_op(PHYSDEVOP_get_free_pirq, &op_get_free_pirq);
+
+ WARN_ONCE(rc == -ENOSYS,
+ "hypervisor does not support the PHYSDEVOP_get_free_pirq interface\n");
+
+ return rc ? -1 : op_get_free_pirq.pirq;
+}
+
+int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc,
+ int pirq, const char *name, domid_t domid)
+{
+ int irq, ret;
+
+ mutex_lock(&irq_mapping_update_lock);
+
+ irq = xen_allocate_irq_dynamic();
+ if (irq < 0)
+ goto out;
+
+ irq_set_chip_and_handler_name(irq, &xen_pirq_chip, handle_edge_irq,
+ name);
+
+ xen_irq_info_pirq_init(irq, 0, pirq, 0, domid, 0);
+ ret = irq_set_msi_desc(irq, msidesc);
+ if (ret < 0)
+ goto error_irq;
+out:
+ mutex_unlock(&irq_mapping_update_lock);
+ return irq;
+error_irq:
+ mutex_unlock(&irq_mapping_update_lock);
+ xen_free_irq(irq);
+ return ret;
+}
+#endif
+
+int xen_destroy_irq(int irq)
+{
+ struct irq_desc *desc;
+ struct physdev_unmap_pirq unmap_irq;
+ struct irq_info *info = info_for_irq(irq);
+ int rc = -ENOENT;
+
+ mutex_lock(&irq_mapping_update_lock);
+
+ desc = irq_to_desc(irq);
+ if (!desc)
+ goto out;
+
+ if (xen_initial_domain()) {
+ unmap_irq.pirq = info->u.pirq.pirq;
+ unmap_irq.domid = info->u.pirq.domid;
+ rc = HYPERVISOR_physdev_op(PHYSDEVOP_unmap_pirq, &unmap_irq);
+ /* If another domain quits without making the pci_disable_msix
+ * call, the Xen hypervisor takes care of freeing the PIRQs
+ * (free_domain_pirqs).
+ */
+ if ((rc == -ESRCH && info->u.pirq.domid != DOMID_SELF))
+ pr_info("domain %d does not have %d anymore\n",
+ info->u.pirq.domid, info->u.pirq.pirq);
+ else if (rc) {
+ pr_warn("unmap irq failed %d\n", rc);
+ goto out;
+ }
+ }
+
+ xen_free_irq(irq);
+
+out:
+ mutex_unlock(&irq_mapping_update_lock);
+ return rc;
+}
+
+int xen_irq_from_pirq(unsigned pirq)
+{
+ int irq;
+
+ struct irq_info *info;
+
+ mutex_lock(&irq_mapping_update_lock);
+
+ list_for_each_entry(info, &xen_irq_list_head, list) {
+ if (info->type != IRQT_PIRQ)
+ continue;
+ irq = info->irq;
+ if (info->u.pirq.pirq == pirq)
+ goto out;
+ }
+ irq = -1;
+out:
+ mutex_unlock(&irq_mapping_update_lock);
+
+ return irq;
+}
+
+
+int xen_pirq_from_irq(unsigned irq)
+{
+ return pirq_from_irq(irq);
+}
+EXPORT_SYMBOL_GPL(xen_pirq_from_irq);
+int bind_evtchn_to_irq(unsigned int evtchn)
+{
+ int irq;
+
+ mutex_lock(&irq_mapping_update_lock);
+
+ irq = evtchn_to_irq[evtchn];
+
+ if (irq == -1) {
+ irq = xen_allocate_irq_dynamic();
+ if (irq < 0)
+ goto out;
+
+ irq_set_chip_and_handler_name(irq, &xen_dynamic_chip,
+ handle_edge_irq, "event");
+
+ xen_irq_info_evtchn_init(irq, evtchn);
+ } else {
+ struct irq_info *info = info_for_irq(irq);
+ WARN_ON(info == NULL || info->type != IRQT_EVTCHN);
+ }
+
+out:
+ mutex_unlock(&irq_mapping_update_lock);
+
+ return irq;
+}
+EXPORT_SYMBOL_GPL(bind_evtchn_to_irq);
+
+static int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu)
+{
+ struct evtchn_bind_ipi bind_ipi;
+ int evtchn, irq;
+
+ mutex_lock(&irq_mapping_update_lock);
+
+ irq = per_cpu(ipi_to_irq, cpu)[ipi];
+
+ if (irq == -1) {
+ irq = xen_allocate_irq_dynamic();
+ if (irq < 0)
+ goto out;
+
+ irq_set_chip_and_handler_name(irq, &xen_percpu_chip,
+ handle_percpu_irq, "ipi");
+
+ bind_ipi.vcpu = cpu;
+ if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi,
+ &bind_ipi) != 0)
+ BUG();
+ evtchn = bind_ipi.port;
+
+ xen_irq_info_ipi_init(cpu, irq, evtchn, ipi);
+
+ bind_evtchn_to_cpu(evtchn, cpu);
+ } else {
+ struct irq_info *info = info_for_irq(irq);
+ WARN_ON(info == NULL || info->type != IRQT_IPI);
+ }
+
+ out:
+ mutex_unlock(&irq_mapping_update_lock);
+ return irq;
+}
+
+static int bind_interdomain_evtchn_to_irq(unsigned int remote_domain,
+ unsigned int remote_port)
+{
+ struct evtchn_bind_interdomain bind_interdomain;
+ int err;
+
+ bind_interdomain.remote_dom = remote_domain;
+ bind_interdomain.remote_port = remote_port;
+
+ err = HYPERVISOR_event_channel_op(EVTCHNOP_bind_interdomain,
+ &bind_interdomain);
+
+ return err ? : bind_evtchn_to_irq(bind_interdomain.local_port);
+}
+
+static int find_virq(unsigned int virq, unsigned int cpu)
+{
+ struct evtchn_status status;
+ int port, rc = -ENOENT;
+
+ memset(&status, 0, sizeof(status));
+ for (port = 0; port <= NR_EVENT_CHANNELS; port++) {
+ status.dom = DOMID_SELF;
+ status.port = port;
+ rc = HYPERVISOR_event_channel_op(EVTCHNOP_status, &status);
+ if (rc < 0)
+ continue;
+ if (status.status != EVTCHNSTAT_virq)
+ continue;
+ if (status.u.virq == virq && status.vcpu == cpu) {
+ rc = port;
+ break;
+ }
+ }
+ return rc;
+}
+
+int bind_virq_to_irq(unsigned int virq, unsigned int cpu)
+{
+ struct evtchn_bind_virq bind_virq;
+ int evtchn, irq, ret;
+
+ mutex_lock(&irq_mapping_update_lock);
+
+ irq = per_cpu(virq_to_irq, cpu)[virq];
+
+ if (irq == -1) {
+ irq = xen_allocate_irq_dynamic();
+ if (irq < 0)
+ goto out;
+
+ irq_set_chip_and_handler_name(irq, &xen_percpu_chip,
+ handle_percpu_irq, "virq");
+
+ bind_virq.virq = virq;
+ bind_virq.vcpu = cpu;
+ ret = HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq,
+ &bind_virq);
+ if (ret == 0)
+ evtchn = bind_virq.port;
+ else {
+ if (ret == -EEXIST)
+ ret = find_virq(virq, cpu);
+ BUG_ON(ret < 0);
+ evtchn = ret;
+ }
+
+ xen_irq_info_virq_init(cpu, irq, evtchn, virq);
+
+ bind_evtchn_to_cpu(evtchn, cpu);
+ } else {
+ struct irq_info *info = info_for_irq(irq);
+ WARN_ON(info == NULL || info->type != IRQT_VIRQ);
+ }
+
+out:
+ mutex_unlock(&irq_mapping_update_lock);
+
+ return irq;
+}
+
+static void unbind_from_irq(unsigned int irq)
+{
+ struct evtchn_close close;
+ int evtchn = evtchn_from_irq(irq);
+ struct irq_info *info = irq_get_handler_data(irq);
+
+ if (WARN_ON(!info))
+ return;
+
+ mutex_lock(&irq_mapping_update_lock);
+
+ if (info->refcnt > 0) {
+ info->refcnt--;
+ if (info->refcnt != 0)
+ goto done;
+ }
+
+ if (VALID_EVTCHN(evtchn)) {
+ close.port = evtchn;
+ if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0)
+ BUG();
+
+ switch (type_from_irq(irq)) {
+ case IRQT_VIRQ:
+ per_cpu(virq_to_irq, cpu_from_evtchn(evtchn))
+ [virq_from_irq(irq)] = -1;
+ break;
+ case IRQT_IPI:
+ per_cpu(ipi_to_irq, cpu_from_evtchn(evtchn))
+ [ipi_from_irq(irq)] = -1;
+ break;
+ default:
+ break;
+ }
+
+ /* Closed ports are implicitly re-bound to VCPU0. */
+ bind_evtchn_to_cpu(evtchn, 0);
+
+ evtchn_to_irq[evtchn] = -1;
+ }
+
+ BUG_ON(info_for_irq(irq)->type == IRQT_UNBOUND);
+
+ xen_free_irq(irq);
+
+ done:
+ mutex_unlock(&irq_mapping_update_lock);
+}
+
+int bind_evtchn_to_irqhandler(unsigned int evtchn,
+ irq_handler_t handler,
+ unsigned long irqflags,
+ const char *devname, void *dev_id)
+{
+ int irq, retval;
+
+ irq = bind_evtchn_to_irq(evtchn);
+ if (irq < 0)
+ return irq;
+ retval = request_irq(irq, handler, irqflags, devname, dev_id);
+ if (retval != 0) {
+ unbind_from_irq(irq);
+ return retval;
+ }
+
+ return irq;
+}
+EXPORT_SYMBOL_GPL(bind_evtchn_to_irqhandler);
+
+int bind_interdomain_evtchn_to_irqhandler(unsigned int remote_domain,
+ unsigned int remote_port,
+ irq_handler_t handler,
+ unsigned long irqflags,
+ const char *devname,
+ void *dev_id)
+{
+ int irq, retval;
+
+ irq = bind_interdomain_evtchn_to_irq(remote_domain, remote_port);
+ if (irq < 0)
+ return irq;
+
+ retval = request_irq(irq, handler, irqflags, devname, dev_id);
+ if (retval != 0) {
+ unbind_from_irq(irq);
+ return retval;
+ }
+
+ return irq;
+}
+EXPORT_SYMBOL_GPL(bind_interdomain_evtchn_to_irqhandler);
+
+int bind_virq_to_irqhandler(unsigned int virq, unsigned int cpu,
+ irq_handler_t handler,
+ unsigned long irqflags, const char *devname, void *dev_id)
+{
+ int irq, retval;
+
+ irq = bind_virq_to_irq(virq, cpu);
+ if (irq < 0)
+ return irq;
+ retval = request_irq(irq, handler, irqflags, devname, dev_id);
+ if (retval != 0) {
+ unbind_from_irq(irq);
+ return retval;
+ }
+
+ return irq;
+}
+EXPORT_SYMBOL_GPL(bind_virq_to_irqhandler);
+
+int bind_ipi_to_irqhandler(enum ipi_vector ipi,
+ unsigned int cpu,
+ irq_handler_t handler,
+ unsigned long irqflags,
+ const char *devname,
+ void *dev_id)
+{
+ int irq, retval;
+
+ irq = bind_ipi_to_irq(ipi, cpu);
+ if (irq < 0)
+ return irq;
+
+ irqflags |= IRQF_NO_SUSPEND | IRQF_FORCE_RESUME | IRQF_EARLY_RESUME;
+ retval = request_irq(irq, handler, irqflags, devname, dev_id);
+ if (retval != 0) {
+ unbind_from_irq(irq);
+ return retval;
+ }
+
+ return irq;
+}
+
+void unbind_from_irqhandler(unsigned int irq, void *dev_id)
+{
+ struct irq_info *info = irq_get_handler_data(irq);
+
+ if (WARN_ON(!info))
+ return;
+ free_irq(irq, dev_id);
+ unbind_from_irq(irq);
+}
+EXPORT_SYMBOL_GPL(unbind_from_irqhandler);
+
+int evtchn_make_refcounted(unsigned int evtchn)
+{
+ int irq = evtchn_to_irq[evtchn];
+ struct irq_info *info;
+
+ if (irq == -1)
+ return -ENOENT;
+
+ info = irq_get_handler_data(irq);
+
+ if (!info)
+ return -ENOENT;
+
+ WARN_ON(info->refcnt != -1);
+
+ info->refcnt = 1;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(evtchn_make_refcounted);
+
+int evtchn_get(unsigned int evtchn)
+{
+ int irq;
+ struct irq_info *info;
+ int err = -ENOENT;
+
+ if (evtchn >= NR_EVENT_CHANNELS)
+ return -EINVAL;
+
+ mutex_lock(&irq_mapping_update_lock);
+
+ irq = evtchn_to_irq[evtchn];
+ if (irq == -1)
+ goto done;
+
+ info = irq_get_handler_data(irq);
+
+ if (!info)
+ goto done;
+
+ err = -EINVAL;
+ if (info->refcnt <= 0)
+ goto done;
+
+ info->refcnt++;
+ err = 0;
+ done:
+ mutex_unlock(&irq_mapping_update_lock);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(evtchn_get);
+
+void evtchn_put(unsigned int evtchn)
+{
+ int irq = evtchn_to_irq[evtchn];
+ if (WARN_ON(irq == -1))
+ return;
+ unbind_from_irq(irq);
+}
+EXPORT_SYMBOL_GPL(evtchn_put);
+
+void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector)
+{
+ int irq;
+
+#ifdef CONFIG_X86
+ if (unlikely(vector == XEN_NMI_VECTOR)) {
+ int rc = HYPERVISOR_vcpu_op(VCPUOP_send_nmi, cpu, NULL);
+ if (rc < 0)
+ printk(KERN_WARNING "Sending nmi to CPU%d failed (rc:%d)\n", cpu, rc);
+ return;
+ }
+#endif
+ irq = per_cpu(ipi_to_irq, cpu)[vector];
+ BUG_ON(irq < 0);
+ notify_remote_via_irq(irq);
+}
+
+irqreturn_t xen_debug_interrupt(int irq, void *dev_id)
+{
+ struct shared_info *sh = HYPERVISOR_shared_info;
+ int cpu = smp_processor_id();
+ xen_ulong_t *cpu_evtchn = per_cpu(cpu_evtchn_mask, cpu);
+ int i;
+ unsigned long flags;
+ static DEFINE_SPINLOCK(debug_lock);
+ struct vcpu_info *v;
+
+ spin_lock_irqsave(&debug_lock, flags);
+
+ printk("\nvcpu %d\n ", cpu);
+
+ for_each_online_cpu(i) {
+ int pending;
+ v = per_cpu(xen_vcpu, i);
+ pending = (get_irq_regs() && i == cpu)
+ ? xen_irqs_disabled(get_irq_regs())
+ : v->evtchn_upcall_mask;
+ printk("%d: masked=%d pending=%d event_sel %0*"PRI_xen_ulong"\n ", i,
+ pending, v->evtchn_upcall_pending,
+ (int)(sizeof(v->evtchn_pending_sel)*2),
+ v->evtchn_pending_sel);
+ }
+ v = per_cpu(xen_vcpu, cpu);
+
+ printk("\npending:\n ");
+ for (i = ARRAY_SIZE(sh->evtchn_pending)-1; i >= 0; i--)
+ printk("%0*"PRI_xen_ulong"%s",
+ (int)sizeof(sh->evtchn_pending[0])*2,
+ sh->evtchn_pending[i],
+ i % 8 == 0 ? "\n " : " ");
+ printk("\nglobal mask:\n ");
+ for (i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--)
+ printk("%0*"PRI_xen_ulong"%s",
+ (int)(sizeof(sh->evtchn_mask[0])*2),
+ sh->evtchn_mask[i],
+ i % 8 == 0 ? "\n " : " ");
+
+ printk("\nglobally unmasked:\n ");
+ for (i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--)
+ printk("%0*"PRI_xen_ulong"%s",
+ (int)(sizeof(sh->evtchn_mask[0])*2),
+ sh->evtchn_pending[i] & ~sh->evtchn_mask[i],
+ i % 8 == 0 ? "\n " : " ");
+
+ printk("\nlocal cpu%d mask:\n ", cpu);
+ for (i = (NR_EVENT_CHANNELS/BITS_PER_EVTCHN_WORD)-1; i >= 0; i--)
+ printk("%0*"PRI_xen_ulong"%s", (int)(sizeof(cpu_evtchn[0])*2),
+ cpu_evtchn[i],
+ i % 8 == 0 ? "\n " : " ");
+
+ printk("\nlocally unmasked:\n ");
+ for (i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--) {
+ xen_ulong_t pending = sh->evtchn_pending[i]
+ & ~sh->evtchn_mask[i]
+ & cpu_evtchn[i];
+ printk("%0*"PRI_xen_ulong"%s",
+ (int)(sizeof(sh->evtchn_mask[0])*2),
+ pending, i % 8 == 0 ? "\n " : " ");
+ }
+
+ printk("\npending list:\n");
+ for (i = 0; i < NR_EVENT_CHANNELS; i++) {
+ if (sync_test_bit(i, BM(sh->evtchn_pending))) {
+ int word_idx = i / BITS_PER_EVTCHN_WORD;
+ printk(" %d: event %d -> irq %d%s%s%s\n",
+ cpu_from_evtchn(i), i,
+ evtchn_to_irq[i],
+ sync_test_bit(word_idx, BM(&v->evtchn_pending_sel))
+ ? "" : " l2-clear",
+ !sync_test_bit(i, BM(sh->evtchn_mask))
+ ? "" : " globally-masked",
+ sync_test_bit(i, BM(cpu_evtchn))
+ ? "" : " locally-masked");
+ }
+ }
+
+ spin_unlock_irqrestore(&debug_lock, flags);
+
+ return IRQ_HANDLED;
+}
+
+static DEFINE_PER_CPU(unsigned, xed_nesting_count);
+static DEFINE_PER_CPU(unsigned int, current_word_idx);
+static DEFINE_PER_CPU(unsigned int, current_bit_idx);
+
+/*
+ * Mask out the i least significant bits of w
+ */
+#define MASK_LSBS(w, i) (w & ((~((xen_ulong_t)0UL)) << i))
+
+/*
+ * Search the CPUs pending events bitmasks. For each one found, map
+ * the event number to an irq, and feed it into do_IRQ() for
+ * handling.
+ *
+ * Xen uses a two-level bitmap to speed searching. The first level is
+ * a bitset of words which contain pending event bits. The second
+ * level is a bitset of pending events themselves.
+ */
+static void __xen_evtchn_do_upcall(void)
+{
+ int start_word_idx, start_bit_idx;
+ int word_idx, bit_idx;
+ int i, irq;
+ int cpu = get_cpu();
+ struct shared_info *s = HYPERVISOR_shared_info;
+ struct vcpu_info *vcpu_info = __this_cpu_read(xen_vcpu);
+ unsigned count;
+
+ do {
+ xen_ulong_t pending_words;
+ xen_ulong_t pending_bits;
+ struct irq_desc *desc;
+
+ vcpu_info->evtchn_upcall_pending = 0;
+
+ if (__this_cpu_inc_return(xed_nesting_count) - 1)
+ goto out;
+
+ /*
+ * Master flag must be cleared /before/ clearing
+ * selector flag. xchg_xen_ulong must contain an
+ * appropriate barrier.
+ */
+ if ((irq = per_cpu(virq_to_irq, cpu)[VIRQ_TIMER]) != -1) {
+ int evtchn = evtchn_from_irq(irq);
+ word_idx = evtchn / BITS_PER_LONG;
+ pending_bits = evtchn % BITS_PER_LONG;
+ if (active_evtchns(cpu, s, word_idx) & (1ULL << pending_bits)) {
+ desc = irq_to_desc(irq);
+ if (desc)
+ generic_handle_irq_desc(irq, desc);
+ }
+ }
+
+ pending_words = xchg_xen_ulong(&vcpu_info->evtchn_pending_sel, 0);
+
+ start_word_idx = __this_cpu_read(current_word_idx);
+ start_bit_idx = __this_cpu_read(current_bit_idx);
+
+ word_idx = start_word_idx;
+
+ for (i = 0; pending_words != 0; i++) {
+ xen_ulong_t words;
+
+ words = MASK_LSBS(pending_words, word_idx);
+
+ /*
+ * If we masked out all events, wrap to beginning.
+ */
+ if (words == 0) {
+ word_idx = 0;
+ bit_idx = 0;
+ continue;
+ }
+ word_idx = EVTCHN_FIRST_BIT(words);
+
+ pending_bits = active_evtchns(cpu, s, word_idx);
+ bit_idx = 0; /* usually scan entire word from start */
+ /*
+ * We scan the starting word in two parts.
+ *
+ * 1st time: start in the middle, scanning the
+ * upper bits.
+ *
+ * 2nd time: scan the whole word (not just the
+ * parts skipped in the first pass) -- if an
+ * event in the previously scanned bits is
+ * pending again it would just be scanned on
+ * the next loop anyway.
+ */
+ if (word_idx == start_word_idx) {
+ if (i == 0)
+ bit_idx = start_bit_idx;
+ }
+
+ do {
+ xen_ulong_t bits;
+ int port;
+
+ bits = MASK_LSBS(pending_bits, bit_idx);
+
+ /* If we masked out all events, move on. */
+ if (bits == 0)
+ break;
+
+ bit_idx = EVTCHN_FIRST_BIT(bits);
+
+ /* Process port. */
+ port = (word_idx * BITS_PER_EVTCHN_WORD) + bit_idx;
+ irq = evtchn_to_irq[port];
+
+ if (irq != -1) {
+ desc = irq_to_desc(irq);
+ if (desc)
+ generic_handle_irq_desc(irq, desc);
+ }
+
+ bit_idx = (bit_idx + 1) % BITS_PER_EVTCHN_WORD;
+
+ /* Next caller starts at last processed + 1 */
+ __this_cpu_write(current_word_idx,
+ bit_idx ? word_idx :
+ (word_idx+1) % BITS_PER_EVTCHN_WORD);
+ __this_cpu_write(current_bit_idx, bit_idx);
+ } while (bit_idx != 0);
+
+ /* Scan start_l1i twice; all others once. */
+ if ((word_idx != start_word_idx) || (i != 0))
+ pending_words &= ~(1UL << word_idx);
+
+ word_idx = (word_idx + 1) % BITS_PER_EVTCHN_WORD;
+ }
+
+ BUG_ON(!irqs_disabled());
+
+ count = __this_cpu_read(xed_nesting_count);
+ __this_cpu_write(xed_nesting_count, 0);
+ } while (count != 1 || vcpu_info->evtchn_upcall_pending);
+
+out:
+
+ put_cpu();
+}
+
+void xen_evtchn_do_upcall(struct pt_regs *regs)
+{
+ struct pt_regs *old_regs = set_irq_regs(regs);
+
+ irq_enter();
+#ifdef CONFIG_X86
+ exit_idle();
+#endif
+
+ __xen_evtchn_do_upcall();
+
+ irq_exit();
+ set_irq_regs(old_regs);
+}
+
+void xen_hvm_evtchn_do_upcall(void)
+{
+ __xen_evtchn_do_upcall();
+}
+EXPORT_SYMBOL_GPL(xen_hvm_evtchn_do_upcall);
+
+/* Rebind a new event channel to an existing irq. */
+void rebind_evtchn_irq(int evtchn, int irq)
+{
+ struct irq_info *info = info_for_irq(irq);
+
+ if (WARN_ON(!info))
+ return;
+
+ /* Make sure the irq is masked, since the new event channel
+ will also be masked. */
+ disable_irq(irq);
+
+ mutex_lock(&irq_mapping_update_lock);
+
+ /* After resume the irq<->evtchn mappings are all cleared out */
+ BUG_ON(evtchn_to_irq[evtchn] != -1);
+ /* Expect irq to have been bound before,
+ so there should be a proper type */
+ BUG_ON(info->type == IRQT_UNBOUND);
+
+ xen_irq_info_evtchn_init(irq, evtchn);
+
+ mutex_unlock(&irq_mapping_update_lock);
+
+ /* new event channels are always bound to cpu 0 */
+ irq_set_affinity(irq, cpumask_of(0));
+
+ /* Unmask the event channel. */
+ enable_irq(irq);
+}
+
+/* Rebind an evtchn so that it gets delivered to a specific cpu */
+static int rebind_irq_to_cpu(unsigned irq, unsigned tcpu)
+{
+ struct evtchn_bind_vcpu bind_vcpu;
+ int evtchn = evtchn_from_irq(irq);
+ int masked;
+
+ if (!VALID_EVTCHN(evtchn))
+ return -1;
+
+ /*
+ * Events delivered via platform PCI interrupts are always
+ * routed to vcpu 0 and hence cannot be rebound.
+ */
+ if (xen_hvm_domain() && !xen_have_vector_callback)
+ return -1;
+
+ /* Send future instances of this interrupt to other vcpu. */
+ bind_vcpu.port = evtchn;
+ bind_vcpu.vcpu = tcpu;
+
+ /*
+ * Mask the event while changing the VCPU binding to prevent
+ * it being delivered on an unexpected VCPU.
+ */
+ masked = test_and_set_mask(evtchn);
+
+ /*
+ * If this fails, it usually just indicates that we're dealing with a
+ * virq or IPI channel, which don't actually need to be rebound. Ignore
+ * it, but don't do the xenlinux-level rebind in that case.
+ */
+ if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_vcpu, &bind_vcpu) >= 0)
+ bind_evtchn_to_cpu(evtchn, tcpu);
+
+ if (!masked)
+ unmask_evtchn(evtchn);
+
+ return 0;
+}
+
+static int set_affinity_irq(struct irq_data *data, const struct cpumask *dest,
+ bool force)
+{
+ unsigned tcpu = cpumask_first(dest);
+
+ return rebind_irq_to_cpu(data->irq, tcpu);
+}
+
+static int retrigger_evtchn(int evtchn)
+{
+ int masked;
+
+ if (!VALID_EVTCHN(evtchn))
+ return 0;
+
+ masked = test_and_set_mask(evtchn);
+ set_evtchn(evtchn);
+ if (!masked)
+ unmask_evtchn(evtchn);
+
+ return 1;
+}
+
+int resend_irq_on_evtchn(unsigned int irq)
+{
+ return retrigger_evtchn(evtchn_from_irq(irq));
+}
+
+static void enable_dynirq(struct irq_data *data)
+{
+ int evtchn = evtchn_from_irq(data->irq);
+
+ if (VALID_EVTCHN(evtchn))
+ unmask_evtchn(evtchn);
+}
+
+static void disable_dynirq(struct irq_data *data)
+{
+ int evtchn = evtchn_from_irq(data->irq);
+
+ if (VALID_EVTCHN(evtchn))
+ mask_evtchn(evtchn);
+}
+
+static void ack_dynirq(struct irq_data *data)
+{
+ int evtchn = evtchn_from_irq(data->irq);
+
+ irq_move_irq(data);
+
+ if (VALID_EVTCHN(evtchn))
+ clear_evtchn(evtchn);
+}
+
+static void mask_ack_dynirq(struct irq_data *data)
+{
+ disable_dynirq(data);
+ ack_dynirq(data);
+}
+
+static int retrigger_dynirq(struct irq_data *data)
+{
+ return retrigger_evtchn(evtchn_from_irq(data->irq));
+}
+
+static void restore_pirqs(void)
+{
+ int pirq, rc, irq, gsi;
+ struct physdev_map_pirq map_irq;
+ struct irq_info *info;
+
+ list_for_each_entry(info, &xen_irq_list_head, list) {
+ if (info->type != IRQT_PIRQ)
+ continue;
+
+ pirq = info->u.pirq.pirq;
+ gsi = info->u.pirq.gsi;
+ irq = info->irq;
+
+ /* save/restore of PT devices doesn't work, so at this point the
+ * only devices present are GSI based emulated devices */
+ if (!gsi)
+ continue;
+
+ map_irq.domid = DOMID_SELF;
+ map_irq.type = MAP_PIRQ_TYPE_GSI;
+ map_irq.index = gsi;
+ map_irq.pirq = pirq;
+
+ rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
+ if (rc) {
+ pr_warn("xen map irq failed gsi=%d irq=%d pirq=%d rc=%d\n",
+ gsi, irq, pirq, rc);
+ xen_free_irq(irq);
+ continue;
+ }
+
+ printk(KERN_DEBUG "xen: --> irq=%d, pirq=%d\n", irq, map_irq.pirq);
+
+ __startup_pirq(irq);
+ }
+}
+
+static void restore_cpu_virqs(unsigned int cpu)
+{
+ struct evtchn_bind_virq bind_virq;
+ int virq, irq, evtchn;
+
+ for (virq = 0; virq < NR_VIRQS; virq++) {
+ if ((irq = per_cpu(virq_to_irq, cpu)[virq]) == -1)
+ continue;
+
+ BUG_ON(virq_from_irq(irq) != virq);
+
+ /* Get a new binding from Xen. */
+ bind_virq.virq = virq;
+ bind_virq.vcpu = cpu;
+ if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq,
+ &bind_virq) != 0)
+ BUG();
+ evtchn = bind_virq.port;
+
+ /* Record the new mapping. */
+ xen_irq_info_virq_init(cpu, irq, evtchn, virq);
+ bind_evtchn_to_cpu(evtchn, cpu);
+ }
+}
+
+static void restore_cpu_ipis(unsigned int cpu)
+{
+ struct evtchn_bind_ipi bind_ipi;
+ int ipi, irq, evtchn;
+
+ for (ipi = 0; ipi < XEN_NR_IPIS; ipi++) {
+ if ((irq = per_cpu(ipi_to_irq, cpu)[ipi]) == -1)
+ continue;
+
+ BUG_ON(ipi_from_irq(irq) != ipi);
+
+ /* Get a new binding from Xen. */
+ bind_ipi.vcpu = cpu;
+ if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi,
+ &bind_ipi) != 0)
+ BUG();
+ evtchn = bind_ipi.port;
+
+ /* Record the new mapping. */
+ xen_irq_info_ipi_init(cpu, irq, evtchn, ipi);
+ bind_evtchn_to_cpu(evtchn, cpu);
+ }
+}
+
+/* Clear an irq's pending state, in preparation for polling on it */
+void xen_clear_irq_pending(int irq)
+{
+ int evtchn = evtchn_from_irq(irq);
+
+ if (VALID_EVTCHN(evtchn))
+ clear_evtchn(evtchn);
+}
+EXPORT_SYMBOL(xen_clear_irq_pending);
+void xen_set_irq_pending(int irq)
+{
+ int evtchn = evtchn_from_irq(irq);
+
+ if (VALID_EVTCHN(evtchn))
+ set_evtchn(evtchn);
+}
+
+bool xen_test_irq_pending(int irq)
+{
+ int evtchn = evtchn_from_irq(irq);
+ bool ret = false;
+
+ if (VALID_EVTCHN(evtchn))
+ ret = test_evtchn(evtchn);
+
+ return ret;
+}
+
+/* Poll waiting for an irq to become pending with timeout. In the usual case,
+ * the irq will be disabled so it won't deliver an interrupt. */
+void xen_poll_irq_timeout(int irq, u64 timeout)
+{
+ evtchn_port_t evtchn = evtchn_from_irq(irq);
+
+ if (VALID_EVTCHN(evtchn)) {
+ struct sched_poll poll;
+
+ poll.nr_ports = 1;
+ poll.timeout = timeout;
+ set_xen_guest_handle(poll.ports, &evtchn);
+
+ if (HYPERVISOR_sched_op(SCHEDOP_poll, &poll) != 0)
+ BUG();
+ }
+}
+EXPORT_SYMBOL(xen_poll_irq_timeout);
+/* Poll waiting for an irq to become pending. In the usual case, the
+ * irq will be disabled so it won't deliver an interrupt. */
+void xen_poll_irq(int irq)
+{
+ xen_poll_irq_timeout(irq, 0 /* no timeout */);
+}
+
+/* Check whether the IRQ line is shared with other guests. */
+int xen_test_irq_shared(int irq)
+{
+ struct irq_info *info = info_for_irq(irq);
+ struct physdev_irq_status_query irq_status;
+
+ if (WARN_ON(!info))
+ return -ENOENT;
+
+ irq_status.irq = info->u.pirq.pirq;
+
+ if (HYPERVISOR_physdev_op(PHYSDEVOP_irq_status_query, &irq_status))
+ return 0;
+ return !(irq_status.flags & XENIRQSTAT_shared);
+}
+EXPORT_SYMBOL_GPL(xen_test_irq_shared);
+
+void xen_irq_resume(void)
+{
+ unsigned int cpu, evtchn;
+ struct irq_info *info;
+
+ /* New event-channel space is not 'live' yet. */
+ for (evtchn = 0; evtchn < NR_EVENT_CHANNELS; evtchn++)
+ mask_evtchn(evtchn);
+
+ /* No IRQ <-> event-channel mappings. */
+ list_for_each_entry(info, &xen_irq_list_head, list)
+ info->evtchn = 0; /* zap event-channel binding */
+
+ for (evtchn = 0; evtchn < NR_EVENT_CHANNELS; evtchn++)
+ evtchn_to_irq[evtchn] = -1;
+
+ for_each_possible_cpu(cpu) {
+ restore_cpu_virqs(cpu);
+ restore_cpu_ipis(cpu);
+ }
+
+ restore_pirqs();
+}
+
+static struct irq_chip xen_dynamic_chip __read_mostly = {
+ .name = "xen-dyn",
+
+ .irq_disable = disable_dynirq,
+ .irq_mask = disable_dynirq,
+ .irq_unmask = enable_dynirq,
+
+ .irq_ack = ack_dynirq,
+ .irq_mask_ack = mask_ack_dynirq,
+
+ .irq_set_affinity = set_affinity_irq,
+ .irq_retrigger = retrigger_dynirq,
+};
+
+static struct irq_chip xen_pirq_chip __read_mostly = {
+ .name = "xen-pirq",
+
+ .irq_startup = startup_pirq,
+ .irq_shutdown = shutdown_pirq,
+ .irq_enable = enable_pirq,
+ .irq_disable = disable_pirq,
+
+ .irq_mask = disable_dynirq,
+ .irq_unmask = enable_dynirq,
+
+ .irq_ack = eoi_pirq,
+ .irq_eoi = eoi_pirq,
+ .irq_mask_ack = mask_ack_pirq,
+
+ .irq_set_affinity = set_affinity_irq,
+
+ .irq_retrigger = retrigger_dynirq,
+};
+
+static struct irq_chip xen_percpu_chip __read_mostly = {
+ .name = "xen-percpu",
+
+ .irq_disable = disable_dynirq,
+ .irq_mask = disable_dynirq,
+ .irq_unmask = enable_dynirq,
+
+ .irq_ack = ack_dynirq,
+};
+
+int xen_set_callback_via(uint64_t via)
+{
+ struct xen_hvm_param a;
+ a.domid = DOMID_SELF;
+ a.index = HVM_PARAM_CALLBACK_IRQ;
+ a.value = via;
+ return HYPERVISOR_hvm_op(HVMOP_set_param, &a);
+}
+EXPORT_SYMBOL_GPL(xen_set_callback_via);
+
+#ifdef CONFIG_XEN_PVHVM
+/* Vector callbacks are better than PCI interrupts to receive event
+ * channel notifications because we can receive vector callbacks on any
+ * vcpu and we don't need PCI support or APIC interactions. */
+void xen_callback_vector(void)
+{
+ int rc;
+ uint64_t callback_via;
+ if (xen_have_vector_callback) {
+ callback_via = HVM_CALLBACK_VECTOR(HYPERVISOR_CALLBACK_VECTOR);
+ rc = xen_set_callback_via(callback_via);
+ if (rc) {
+ pr_err("Request for Xen HVM callback vector failed\n");
+ xen_have_vector_callback = 0;
+ return;
+ }
+ pr_info("Xen HVM callback vector for event delivery is enabled\n");
+ /* in the restore case the vector has already been allocated */
+ if (!test_bit(HYPERVISOR_CALLBACK_VECTOR, used_vectors))
+ alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR,
+ xen_hvm_callback_vector);
+ }
+}
+#else
+void xen_callback_vector(void) {}
+#endif
+
+void __init xen_init_IRQ(void)
+{
+ int i;
+
+ evtchn_to_irq = kcalloc(NR_EVENT_CHANNELS, sizeof(*evtchn_to_irq),
+ GFP_KERNEL);
+ BUG_ON(!evtchn_to_irq);
+ for (i = 0; i < NR_EVENT_CHANNELS; i++)
+ evtchn_to_irq[i] = -1;
+
+ /* No event channels are 'live' right now. */
+ for (i = 0; i < NR_EVENT_CHANNELS; i++)
+ mask_evtchn(i);
+
+ pirq_needs_eoi = pirq_needs_eoi_flag;
+
+#ifdef CONFIG_X86
+ if (xen_hvm_domain()) {
+ xen_callback_vector();
+ native_init_IRQ();
+ /* pci_xen_hvm_init must be called after native_init_IRQ so that
+ * __acpi_register_gsi can point at the right function */
+ pci_xen_hvm_init();
+ } else {
+ int rc;
+ struct physdev_pirq_eoi_gmfn eoi_gmfn;
+
+ irq_ctx_init(smp_processor_id());
+ if (xen_initial_domain())
+ pci_xen_initial_domain();
+
+ pirq_eoi_map = (void *)__get_free_page(GFP_KERNEL|__GFP_ZERO);
+ eoi_gmfn.gmfn = virt_to_mfn(pirq_eoi_map);
+ rc = HYPERVISOR_physdev_op(PHYSDEVOP_pirq_eoi_gmfn_v2, &eoi_gmfn);
+ if (rc != 0) {
+ free_page((unsigned long) pirq_eoi_map);
+ pirq_eoi_map = NULL;
+ } else
+ pirq_needs_eoi = pirq_check_eoi_map;
+ }
+#endif
+}
projects / linux-2.6-microblaze.git / commitdiff