diff options
Diffstat (limited to 'include/xen/events.h')
| -rw-r--r-- | include/xen/events.h | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/include/xen/events.h b/include/xen/events.h new file mode 100644 index 000000000..b303bd24e --- /dev/null +++ b/include/xen/events.h @@ -0,0 +1,140 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _XEN_EVENTS_H +#define _XEN_EVENTS_H + +#include <linux/interrupt.h> +#include <linux/irq.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> + +struct xenbus_device; + +unsigned xen_evtchn_nr_channels(void); + +int bind_evtchn_to_irq(evtchn_port_t evtchn); +int bind_evtchn_to_irq_lateeoi(evtchn_port_t evtchn); +int bind_evtchn_to_irqhandler(evtchn_port_t evtchn, + irq_handler_t handler, + unsigned long irqflags, const char *devname, + void *dev_id); +int bind_evtchn_to_irqhandler_lateeoi(evtchn_port_t 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_lateeoi(struct xenbus_device *dev, + evtchn_port_t remote_port); +int bind_interdomain_evtchn_to_irqhandler_lateeoi(struct xenbus_device *dev, + evtchn_port_t 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); + +/* + * Send late EOI for an IRQ bound to an event channel via one of the *_lateeoi + * functions above. + */ +void xen_irq_lateeoi(unsigned int irq, unsigned int eoi_flags); +/* Signal an event was spurious, i.e. there was no action resulting from it. */ +#define XEN_EOI_FLAG_SPURIOUS 0x00000001 + +#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(evtchn_port_t evtchn); +int evtchn_get(evtchn_port_t evtchn); +void evtchn_put(evtchn_port_t evtchn); + +void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector); +void rebind_evtchn_irq(evtchn_port_t evtchn, int irq); +int xen_set_affinity_evtchn(struct irq_desc *desc, unsigned int tcpu); + +static inline void notify_remote_via_evtchn(evtchn_port_t 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 int irq_from_evtchn(evtchn_port_t evtchn); +int irq_from_virq(unsigned int cpu, unsigned int virq); +evtchn_port_t evtchn_from_irq(unsigned irq); + +int xen_set_callback_via(uint64_t via); +int xen_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 */ |