tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _XEN_EVENTS_H
3#define _XEN_EVENTS_H
4
5#include <linux/interrupt.h>
6#include <linux/irq.h>
7#ifdef CONFIG_PCI_MSI
8#include <linux/msi.h>
9#endif
10
11#include <xen/interface/event_channel.h>
12#include <asm/xen/hypercall.h>
13#include <asm/xen/events.h>
14
15struct xenbus_device;
16
17unsigned xen_evtchn_nr_channels(void);
18
19int bind_evtchn_to_irq(evtchn_port_t evtchn);
20int bind_evtchn_to_irqhandler(evtchn_port_t evtchn,
21 irq_handler_t handler,
22 unsigned long irqflags, const char *devname,
23 void *dev_id);
24int bind_evtchn_to_irqhandler_lateeoi(evtchn_port_t evtchn,
25 irq_handler_t handler,
26 unsigned long irqflags, const char *devname,
27 void *dev_id);
28int bind_virq_to_irq(unsigned int virq, unsigned int cpu, bool percpu);
29int bind_virq_to_irqhandler(unsigned int virq, unsigned int cpu,
30 irq_handler_t handler,
31 unsigned long irqflags, const char *devname,
32 void *dev_id);
33int bind_ipi_to_irqhandler(enum ipi_vector ipi,
34 unsigned int cpu,
35 irq_handler_t handler,
36 unsigned long irqflags,
37 const char *devname,
38 void *dev_id);
39int bind_interdomain_evtchn_to_irq_lateeoi(struct xenbus_device *dev,
40 evtchn_port_t remote_port);
41int bind_interdomain_evtchn_to_irqhandler_lateeoi(struct xenbus_device *dev,
42 evtchn_port_t remote_port,
43 irq_handler_t handler,
44 unsigned long irqflags,
45 const char *devname,
46 void *dev_id);
47
48/*
49 * Common unbind function for all event sources. Takes IRQ to unbind from.
50 * Automatically closes the underlying event channel (even for bindings
51 * made with bind_evtchn_to_irqhandler()).
52 */
53void unbind_from_irqhandler(unsigned int irq, void *dev_id);
54
55/*
56 * Send late EOI for an IRQ bound to an event channel via one of the *_lateeoi
57 * functions above.
58 */
59void xen_irq_lateeoi(unsigned int irq, unsigned int eoi_flags);
60/* Signal an event was spurious, i.e. there was no action resulting from it. */
61#define XEN_EOI_FLAG_SPURIOUS 0x00000001
62
63#define XEN_IRQ_PRIORITY_MAX EVTCHN_FIFO_PRIORITY_MAX
64#define XEN_IRQ_PRIORITY_DEFAULT EVTCHN_FIFO_PRIORITY_DEFAULT
65#define XEN_IRQ_PRIORITY_MIN EVTCHN_FIFO_PRIORITY_MIN
66int xen_set_irq_priority(unsigned irq, unsigned priority);
67
68/*
69 * Allow extra references to event channels exposed to userspace by evtchn
70 */
71int evtchn_make_refcounted(evtchn_port_t evtchn);
72int evtchn_get(evtchn_port_t evtchn);
73void evtchn_put(evtchn_port_t evtchn);
74
75void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector);
76void rebind_evtchn_irq(evtchn_port_t evtchn, int irq);
77int xen_set_affinity_evtchn(struct irq_desc *desc, unsigned int tcpu);
78
79static inline void notify_remote_via_evtchn(evtchn_port_t port)
80{
81 struct evtchn_send send = { .port = port };
82 (void)HYPERVISOR_event_channel_op(EVTCHNOP_send, &send);
83}
84
85void notify_remote_via_irq(int irq);
86
87void xen_irq_resume(void);
88
89/* Clear an irq's pending state, in preparation for polling on it */
90void xen_clear_irq_pending(int irq);
91void xen_set_irq_pending(int irq);
92bool xen_test_irq_pending(int irq);
93
94/* Poll waiting for an irq to become pending. In the usual case, the
95 irq will be disabled so it won't deliver an interrupt. */
96void xen_poll_irq(int irq);
97
98/* Poll waiting for an irq to become pending with a timeout. In the usual case,
99 * the irq will be disabled so it won't deliver an interrupt. */
100void xen_poll_irq_timeout(int irq, u64 timeout);
101
102/* Determine the IRQ which is bound to an event channel */
103unsigned int irq_from_evtchn(evtchn_port_t evtchn);
104int irq_from_virq(unsigned int cpu, unsigned int virq);
105evtchn_port_t evtchn_from_irq(unsigned irq);
106
107int xen_set_callback_via(uint64_t via);
108void xen_evtchn_do_upcall(struct pt_regs *regs);
109void xen_hvm_evtchn_do_upcall(void);
110
111/* Bind a pirq for a physical interrupt to an irq. */
112int xen_bind_pirq_gsi_to_irq(unsigned gsi,
113 unsigned pirq, int shareable, char *name);
114
115#ifdef CONFIG_PCI_MSI
116/* Allocate a pirq for a MSI style physical interrupt. */
117int xen_allocate_pirq_msi(struct pci_dev *dev, struct msi_desc *msidesc);
118/* Bind an PSI pirq to an irq. */
119int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc,
120 int pirq, int nvec, const char *name, domid_t domid);
121#endif
122
123/* De-allocates the above mentioned physical interrupt. */
124int xen_destroy_irq(int irq);
125
126/* Return irq from pirq */
127int xen_irq_from_pirq(unsigned pirq);
128
129/* Return the pirq allocated to the irq. */
130int xen_pirq_from_irq(unsigned irq);
131
132/* Return the irq allocated to the gsi */
133int xen_irq_from_gsi(unsigned gsi);
134
135/* Determine whether to ignore this IRQ if it is passed to a guest. */
136int xen_test_irq_shared(int irq);
137
138/* initialize Xen IRQ subsystem */
139void xen_init_IRQ(void);
140#endif /* _XEN_EVENTS_H */