summaryrefslogtreecommitdiff
path: root/include/xen/events.h
blob: 3b07409f80320e3571ed32fe0877eea631af5655 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
/* 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, bool is_static);
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);

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);
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_evtchn_from_virq(unsigned int cpu, unsigned int virq,
			 evtchn_port_t *evtchn);

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 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);

irqreturn_t xen_debug_interrupt(int irq, void *dev_id);

static inline void xen_evtchn_close(evtchn_port_t port)
{
	struct evtchn_close close;

	close.port = port;
	if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0)
		BUG();
}

#endif	/* _XEN_EVENTS_H */