linux_kernel/include/xen/events.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _XEN_EVENTS_H
#define _XEN_EVENTS_H

#include <linux/interrupt.h>
#ifdef CONFIG_PCI_MSI
#include <linux/msi.h>
#endif

#include <xen/interface/event_channel.h>
#include <asm/xen/hypercall.h>
#include <asm/xen/events.h>

unsigned xen_evtchn_nr_channels(void);

int bind_evtchn_to_irq(unsigned int evtchn);
int bind_evtchn_to_irqhandler(unsigned int evtchn,
			      irq_handler_t handler,
			      unsigned long irqflags, const char *devname,
			      void *dev_id);
int bind_virq_to_irq(unsigned int virq, unsigned int cpu, bool percpu);
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 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 bind_interdomain_evtchn_to_irq(unsigned int remote_domain,
				   unsigned int remote_port);
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);

/*
 * Common unbind function for all event sources. Takes IRQ to unbind from.
 * Automatically closes the underlying event channel (even for bindings
 * made with bind_evtchn_to_irqhandler()).
 */
void unbind_from_irqhandler(unsigned int irq, void *dev_id);

#define XEN_IRQ_PRIORITY_MAX     EVTCHN_FIFO_PRIORITY_MAX
#define XEN_IRQ_PRIORITY_DEFAULT EVTCHN_FIFO_PRIORITY_DEFAULT
#define XEN_IRQ_PRIORITY_MIN     EVTCHN_FIFO_PRIORITY_MIN
int xen_set_irq_priority(unsigned irq, unsigned priority);

/*
 * Allow extra references to event channels exposed to userspace by evtchn
 */
int evtchn_make_refcounted(unsigned int evtchn);
int evtchn_get(unsigned int evtchn);
void evtchn_put(unsigned int evtchn);

void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector);
void rebind_evtchn_irq(int evtchn, int irq);
int xen_rebind_evtchn_to_cpu(int evtchn, unsigned tcpu);

static inline void notify_remote_via_evtchn(int port)
{
	struct evtchn_send send = { .port = port };
	(void)HYPERVISOR_event_channel_op(EVTCHNOP_send, &send);
}

void notify_remote_via_irq(int irq);

void xen_irq_resume(void);

/* Clear an irq's pending state, in preparation for polling on it */
void xen_clear_irq_pending(int irq);
void xen_set_irq_pending(int irq);
bool xen_test_irq_pending(int irq);

/* 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);

/* Poll waiting for an irq to become pending with a 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);

/* Determine the IRQ which is bound to an event channel */
unsigned irq_from_evtchn(unsigned int evtchn);
int irq_from_virq(unsigned int cpu, unsigned int virq);
unsigned int evtchn_from_irq(unsigned irq);

#ifdef CONFIG_XEN_PVHVM
/* Xen HVM evtchn vector callback */
void xen_hvm_callback_vector(void);
#ifdef CONFIG_TRACING
#define trace_xen_hvm_callback_vector xen_hvm_callback_vector
#endif
#endif
int xen_set_callback_via(uint64_t via);
void xen_evtchn_do_upcall(struct pt_regs *regs);
void xen_hvm_evtchn_do_upcall(void);

/* Bind a pirq for a physical interrupt to an irq. */
int xen_bind_pirq_gsi_to_irq(unsigned gsi,
			     unsigned pirq, int shareable, char *name);

#ifdef CONFIG_PCI_MSI
/* Allocate a pirq for a MSI style physical interrupt. */
int xen_allocate_pirq_msi(struct pci_dev *dev, struct msi_desc *msidesc);
/* Bind an PSI pirq to an irq. */
int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc,
			     int pirq, int nvec, const char *name, domid_t domid);
#endif

/* De-allocates the above mentioned physical interrupt. */
int xen_destroy_irq(int irq);

/* Return irq from pirq */
int xen_irq_from_pirq(unsigned pirq);

/* Return the pirq allocated to the irq. */
int xen_pirq_from_irq(unsigned irq);

/* Return the irq allocated to the gsi */
int xen_irq_from_gsi(unsigned gsi);

/* Determine whether to ignore this IRQ if it is passed to a guest. */
int xen_test_irq_shared(int irq);

/* initialize Xen IRQ subsystem */
void xen_init_IRQ(void);
#endif	/* _XEN_EVENTS_H */