1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _XEN_EVENTS_H
3 #define _XEN_EVENTS_H
4
5 #include <linux/interrupt.h>
6 #ifdef CONFIG_PCI_MSI
7 #include <linux/msi.h>
8 #endif
9
10 #include <xen/interface/event_channel.h>
11 #include <asm/xen/hypercall.h>
12 #include <asm/xen/events.h>
13
14 unsigned xen_evtchn_nr_channels(void);
15
16 int bind_evtchn_to_irq(unsigned int evtchn);
17 int bind_evtchn_to_irqhandler(unsigned int evtchn,
18 irq_handler_t handler,
19 unsigned long irqflags, const char *devname,
20 void *dev_id);
21 int bind_virq_to_irq(unsigned int virq, unsigned int cpu, bool percpu);
22 int bind_virq_to_irqhandler(unsigned int virq, unsigned int cpu,
23 irq_handler_t handler,
24 unsigned long irqflags, const char *devname,
25 void *dev_id);
26 int bind_ipi_to_irqhandler(enum ipi_vector ipi,
27 unsigned int cpu,
28 irq_handler_t handler,
29 unsigned long irqflags,
30 const char *devname,
31 void *dev_id);
32 int bind_interdomain_evtchn_to_irq(unsigned int remote_domain,
33 unsigned int remote_port);
34 int bind_interdomain_evtchn_to_irqhandler(unsigned int remote_domain,
35 unsigned int remote_port,
36 irq_handler_t handler,
37 unsigned long irqflags,
38 const char *devname,
39 void *dev_id);
40
41 /*
42 * Common unbind function for all event sources. Takes IRQ to unbind from.
43 * Automatically closes the underlying event channel (even for bindings
44 * made with bind_evtchn_to_irqhandler()).
45 */
46 void unbind_from_irqhandler(unsigned int irq, void *dev_id);
47
48 #define XEN_IRQ_PRIORITY_MAX EVTCHN_FIFO_PRIORITY_MAX
49 #define XEN_IRQ_PRIORITY_DEFAULT EVTCHN_FIFO_PRIORITY_DEFAULT
50 #define XEN_IRQ_PRIORITY_MIN EVTCHN_FIFO_PRIORITY_MIN
51 int xen_set_irq_priority(unsigned irq, unsigned priority);
52
53 /*
54 * Allow extra references to event channels exposed to userspace by evtchn
55 */
56 int evtchn_make_refcounted(unsigned int evtchn);
57 int evtchn_get(unsigned int evtchn);
58 void evtchn_put(unsigned int evtchn);
59
60 void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector);
61 void rebind_evtchn_irq(int evtchn, int irq);
62 int xen_rebind_evtchn_to_cpu(int evtchn, unsigned tcpu);
63
notify_remote_via_evtchn(int port)64 static inline void notify_remote_via_evtchn(int port)
65 {
66 struct evtchn_send send = { .port = port };
67 (void)HYPERVISOR_event_channel_op(EVTCHNOP_send, &send);
68 }
69
70 void notify_remote_via_irq(int irq);
71
72 void xen_irq_resume(void);
73
74 /* Clear an irq's pending state, in preparation for polling on it */
75 void xen_clear_irq_pending(int irq);
76 void xen_set_irq_pending(int irq);
77 bool xen_test_irq_pending(int irq);
78
79 /* Poll waiting for an irq to become pending. In the usual case, the
80 irq will be disabled so it won't deliver an interrupt. */
81 void xen_poll_irq(int irq);
82
83 /* Poll waiting for an irq to become pending with a timeout. In the usual case,
84 * the irq will be disabled so it won't deliver an interrupt. */
85 void xen_poll_irq_timeout(int irq, u64 timeout);
86
87 /* Determine the IRQ which is bound to an event channel */
88 unsigned irq_from_evtchn(unsigned int evtchn);
89 int irq_from_virq(unsigned int cpu, unsigned int virq);
90 unsigned int evtchn_from_irq(unsigned irq);
91
92 /* Xen HVM evtchn vector callback */
93 void xen_hvm_callback_vector(void);
94 #ifdef CONFIG_TRACING
95 #define trace_xen_hvm_callback_vector xen_hvm_callback_vector
96 #endif
97 int xen_set_callback_via(uint64_t via);
98 void xen_evtchn_do_upcall(struct pt_regs *regs);
99 void xen_hvm_evtchn_do_upcall(void);
100
101 /* Bind a pirq for a physical interrupt to an irq. */
102 int xen_bind_pirq_gsi_to_irq(unsigned gsi,
103 unsigned pirq, int shareable, char *name);
104
105 #ifdef CONFIG_PCI_MSI
106 /* Allocate a pirq for a MSI style physical interrupt. */
107 int xen_allocate_pirq_msi(struct pci_dev *dev, struct msi_desc *msidesc);
108 /* Bind an PSI pirq to an irq. */
109 int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc,
110 int pirq, int nvec, const char *name, domid_t domid);
111 #endif
112
113 /* De-allocates the above mentioned physical interrupt. */
114 int xen_destroy_irq(int irq);
115
116 /* Return irq from pirq */
117 int xen_irq_from_pirq(unsigned pirq);
118
119 /* Return the pirq allocated to the irq. */
120 int xen_pirq_from_irq(unsigned irq);
121
122 /* Return the irq allocated to the gsi */
123 int xen_irq_from_gsi(unsigned gsi);
124
125 /* Determine whether to ignore this IRQ if it is passed to a guest. */
126 int xen_test_irq_shared(int irq);
127
128 /* initialize Xen IRQ subsystem */
129 void xen_init_IRQ(void);
130 #endif /* _XEN_EVENTS_H */
131
