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
15 unsigned xen_evtchn_nr_channels(void);
16
17 int bind_evtchn_to_irq(evtchn_port_t evtchn);
18 int bind_evtchn_to_irq_lateeoi(evtchn_port_t evtchn);
19 int bind_evtchn_to_irqhandler(evtchn_port_t evtchn,
20 irq_handler_t handler,
21 unsigned long irqflags, const char *devname,
22 void *dev_id);
23 int bind_evtchn_to_irqhandler_lateeoi(evtchn_port_t evtchn,
24 irq_handler_t handler,
25 unsigned long irqflags, const char *devname,
26 void *dev_id);
27 int bind_virq_to_irq(unsigned int virq, unsigned int cpu, bool percpu);
28 int bind_virq_to_irqhandler(unsigned int virq, unsigned int cpu,
29 irq_handler_t handler,
30 unsigned long irqflags, const char *devname,
31 void *dev_id);
32 int bind_ipi_to_irqhandler(enum ipi_vector ipi,
33 unsigned int cpu,
34 irq_handler_t handler,
35 unsigned long irqflags,
36 const char *devname,
37 void *dev_id);
38 int bind_interdomain_evtchn_to_irq(unsigned int remote_domain,
39 evtchn_port_t remote_port);
40 int bind_interdomain_evtchn_to_irq_lateeoi(unsigned int remote_domain,
41 evtchn_port_t remote_port);
42 int bind_interdomain_evtchn_to_irqhandler(unsigned int remote_domain,
43 evtchn_port_t remote_port,
44 irq_handler_t handler,
45 unsigned long irqflags,
46 const char *devname,
47 void *dev_id);
48 int bind_interdomain_evtchn_to_irqhandler_lateeoi(unsigned int remote_domain,
49 evtchn_port_t remote_port,
50 irq_handler_t handler,
51 unsigned long irqflags,
52 const char *devname,
53 void *dev_id);
54
55 /*
56 * Common unbind function for all event sources. Takes IRQ to unbind from.
57 * Automatically closes the underlying event channel (even for bindings
58 * made with bind_evtchn_to_irqhandler()).
59 */
60 void unbind_from_irqhandler(unsigned int irq, void *dev_id);
61
62 /*
63 * Send late EOI for an IRQ bound to an event channel via one of the *_lateeoi
64 * functions above.
65 */
66 void xen_irq_lateeoi(unsigned int irq, unsigned int eoi_flags);
67 /* Signal an event was spurious, i.e. there was no action resulting from it. */
68 #define XEN_EOI_FLAG_SPURIOUS 0x00000001
69
70 #define XEN_IRQ_PRIORITY_MAX EVTCHN_FIFO_PRIORITY_MAX
71 #define XEN_IRQ_PRIORITY_DEFAULT EVTCHN_FIFO_PRIORITY_DEFAULT
72 #define XEN_IRQ_PRIORITY_MIN EVTCHN_FIFO_PRIORITY_MIN
73 int xen_set_irq_priority(unsigned irq, unsigned priority);
74
75 /*
76 * Allow extra references to event channels exposed to userspace by evtchn
77 */
78 int evtchn_make_refcounted(unsigned int evtchn);
79 int evtchn_get(unsigned int evtchn);
80 void evtchn_put(unsigned int evtchn);
81
82 void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector);
83 void rebind_evtchn_irq(int evtchn, int irq);
84 int xen_set_affinity_evtchn(struct irq_desc *desc, unsigned int tcpu);
85
notify_remote_via_evtchn(int port)86 static inline void notify_remote_via_evtchn(int port)
87 {
88 struct evtchn_send send = { .port = port };
89 (void)HYPERVISOR_event_channel_op(EVTCHNOP_send, &send);
90 }
91
92 void notify_remote_via_irq(int irq);
93
94 void xen_irq_resume(void);
95
96 /* Clear an irq's pending state, in preparation for polling on it */
97 void xen_clear_irq_pending(int irq);
98 void xen_set_irq_pending(int irq);
99 bool xen_test_irq_pending(int irq);
100
101 /* Poll waiting for an irq to become pending. In the usual case, the
102 irq will be disabled so it won't deliver an interrupt. */
103 void xen_poll_irq(int irq);
104
105 /* Poll waiting for an irq to become pending with a timeout. In the usual case,
106 * the irq will be disabled so it won't deliver an interrupt. */
107 void xen_poll_irq_timeout(int irq, u64 timeout);
108
109 /* Determine the IRQ which is bound to an event channel */
110 unsigned irq_from_evtchn(unsigned int evtchn);
111 int irq_from_virq(unsigned int cpu, unsigned int virq);
112 unsigned int evtchn_from_irq(unsigned irq);
113
114 /* Xen HVM evtchn vector callback */
115 void xen_hvm_callback_vector(void);
116 #ifdef CONFIG_TRACING
117 #define trace_xen_hvm_callback_vector xen_hvm_callback_vector
118 #endif
119 int xen_set_callback_via(uint64_t via);
120 void xen_evtchn_do_upcall(struct pt_regs *regs);
121 void xen_hvm_evtchn_do_upcall(void);
122
123 /* Bind a pirq for a physical interrupt to an irq. */
124 int xen_bind_pirq_gsi_to_irq(unsigned gsi,
125 unsigned pirq, int shareable, char *name);
126
127 #ifdef CONFIG_PCI_MSI
128 /* Allocate a pirq for a MSI style physical interrupt. */
129 int xen_allocate_pirq_msi(struct pci_dev *dev, struct msi_desc *msidesc);
130 /* Bind an PSI pirq to an irq. */
131 int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc,
132 int pirq, int nvec, const char *name, domid_t domid);
133 #endif
134
135 /* De-allocates the above mentioned physical interrupt. */
136 int xen_destroy_irq(int irq);
137
138 /* Return irq from pirq */
139 int xen_irq_from_pirq(unsigned pirq);
140
141 /* Return the pirq allocated to the irq. */
142 int xen_pirq_from_irq(unsigned irq);
143
144 /* Return the irq allocated to the gsi */
145 int xen_irq_from_gsi(unsigned gsi);
146
147 /* Determine whether to ignore this IRQ if it is passed to a guest. */
148 int xen_test_irq_shared(int irq);
149
150 /* initialize Xen IRQ subsystem */
151 void xen_init_IRQ(void);
152 #endif /* _XEN_EVENTS_H */
153