1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun #ifndef _XEN_EVENTS_H
3*4882a593Smuzhiyun #define _XEN_EVENTS_H
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun #include <linux/interrupt.h>
6*4882a593Smuzhiyun #include <linux/irq.h>
7*4882a593Smuzhiyun #ifdef CONFIG_PCI_MSI
8*4882a593Smuzhiyun #include <linux/msi.h>
9*4882a593Smuzhiyun #endif
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #include <xen/interface/event_channel.h>
12*4882a593Smuzhiyun #include <asm/xen/hypercall.h>
13*4882a593Smuzhiyun #include <asm/xen/events.h>
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun unsigned xen_evtchn_nr_channels(void);
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun int bind_evtchn_to_irq(evtchn_port_t evtchn);
18*4882a593Smuzhiyun int bind_evtchn_to_irq_lateeoi(evtchn_port_t evtchn);
19*4882a593Smuzhiyun int bind_evtchn_to_irqhandler(evtchn_port_t evtchn,
20*4882a593Smuzhiyun irq_handler_t handler,
21*4882a593Smuzhiyun unsigned long irqflags, const char *devname,
22*4882a593Smuzhiyun void *dev_id);
23*4882a593Smuzhiyun int bind_evtchn_to_irqhandler_lateeoi(evtchn_port_t evtchn,
24*4882a593Smuzhiyun irq_handler_t handler,
25*4882a593Smuzhiyun unsigned long irqflags, const char *devname,
26*4882a593Smuzhiyun void *dev_id);
27*4882a593Smuzhiyun int bind_virq_to_irq(unsigned int virq, unsigned int cpu, bool percpu);
28*4882a593Smuzhiyun int bind_virq_to_irqhandler(unsigned int virq, unsigned int cpu,
29*4882a593Smuzhiyun irq_handler_t handler,
30*4882a593Smuzhiyun unsigned long irqflags, const char *devname,
31*4882a593Smuzhiyun void *dev_id);
32*4882a593Smuzhiyun int bind_ipi_to_irqhandler(enum ipi_vector ipi,
33*4882a593Smuzhiyun unsigned int cpu,
34*4882a593Smuzhiyun irq_handler_t handler,
35*4882a593Smuzhiyun unsigned long irqflags,
36*4882a593Smuzhiyun const char *devname,
37*4882a593Smuzhiyun void *dev_id);
38*4882a593Smuzhiyun int bind_interdomain_evtchn_to_irq_lateeoi(unsigned int remote_domain,
39*4882a593Smuzhiyun evtchn_port_t remote_port);
40*4882a593Smuzhiyun int bind_interdomain_evtchn_to_irqhandler_lateeoi(unsigned int remote_domain,
41*4882a593Smuzhiyun evtchn_port_t remote_port,
42*4882a593Smuzhiyun irq_handler_t handler,
43*4882a593Smuzhiyun unsigned long irqflags,
44*4882a593Smuzhiyun const char *devname,
45*4882a593Smuzhiyun void *dev_id);
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun /*
48*4882a593Smuzhiyun * Common unbind function for all event sources. Takes IRQ to unbind from.
49*4882a593Smuzhiyun * Automatically closes the underlying event channel (even for bindings
50*4882a593Smuzhiyun * made with bind_evtchn_to_irqhandler()).
51*4882a593Smuzhiyun */
52*4882a593Smuzhiyun void unbind_from_irqhandler(unsigned int irq, void *dev_id);
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun /*
55*4882a593Smuzhiyun * Send late EOI for an IRQ bound to an event channel via one of the *_lateeoi
56*4882a593Smuzhiyun * functions above.
57*4882a593Smuzhiyun */
58*4882a593Smuzhiyun void xen_irq_lateeoi(unsigned int irq, unsigned int eoi_flags);
59*4882a593Smuzhiyun /* Signal an event was spurious, i.e. there was no action resulting from it. */
60*4882a593Smuzhiyun #define XEN_EOI_FLAG_SPURIOUS 0x00000001
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun #define XEN_IRQ_PRIORITY_MAX EVTCHN_FIFO_PRIORITY_MAX
63*4882a593Smuzhiyun #define XEN_IRQ_PRIORITY_DEFAULT EVTCHN_FIFO_PRIORITY_DEFAULT
64*4882a593Smuzhiyun #define XEN_IRQ_PRIORITY_MIN EVTCHN_FIFO_PRIORITY_MIN
65*4882a593Smuzhiyun int xen_set_irq_priority(unsigned irq, unsigned priority);
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun /*
68*4882a593Smuzhiyun * Allow extra references to event channels exposed to userspace by evtchn
69*4882a593Smuzhiyun */
70*4882a593Smuzhiyun int evtchn_make_refcounted(evtchn_port_t evtchn);
71*4882a593Smuzhiyun int evtchn_get(evtchn_port_t evtchn);
72*4882a593Smuzhiyun void evtchn_put(evtchn_port_t evtchn);
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector);
75*4882a593Smuzhiyun void rebind_evtchn_irq(evtchn_port_t evtchn, int irq);
76*4882a593Smuzhiyun int xen_set_affinity_evtchn(struct irq_desc *desc, unsigned int tcpu);
77*4882a593Smuzhiyun
notify_remote_via_evtchn(evtchn_port_t port)78*4882a593Smuzhiyun static inline void notify_remote_via_evtchn(evtchn_port_t port)
79*4882a593Smuzhiyun {
80*4882a593Smuzhiyun struct evtchn_send send = { .port = port };
81*4882a593Smuzhiyun (void)HYPERVISOR_event_channel_op(EVTCHNOP_send, &send);
82*4882a593Smuzhiyun }
83*4882a593Smuzhiyun
84*4882a593Smuzhiyun void notify_remote_via_irq(int irq);
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun void xen_irq_resume(void);
87*4882a593Smuzhiyun
88*4882a593Smuzhiyun /* Clear an irq's pending state, in preparation for polling on it */
89*4882a593Smuzhiyun void xen_clear_irq_pending(int irq);
90*4882a593Smuzhiyun void xen_set_irq_pending(int irq);
91*4882a593Smuzhiyun bool xen_test_irq_pending(int irq);
92*4882a593Smuzhiyun
93*4882a593Smuzhiyun /* Poll waiting for an irq to become pending. In the usual case, the
94*4882a593Smuzhiyun irq will be disabled so it won't deliver an interrupt. */
95*4882a593Smuzhiyun void xen_poll_irq(int irq);
96*4882a593Smuzhiyun
97*4882a593Smuzhiyun /* Poll waiting for an irq to become pending with a timeout. In the usual case,
98*4882a593Smuzhiyun * the irq will be disabled so it won't deliver an interrupt. */
99*4882a593Smuzhiyun void xen_poll_irq_timeout(int irq, u64 timeout);
100*4882a593Smuzhiyun
101*4882a593Smuzhiyun /* Determine the IRQ which is bound to an event channel */
102*4882a593Smuzhiyun unsigned int irq_from_evtchn(evtchn_port_t evtchn);
103*4882a593Smuzhiyun int irq_from_virq(unsigned int cpu, unsigned int virq);
104*4882a593Smuzhiyun evtchn_port_t evtchn_from_irq(unsigned irq);
105*4882a593Smuzhiyun
106*4882a593Smuzhiyun int xen_set_callback_via(uint64_t via);
107*4882a593Smuzhiyun void xen_evtchn_do_upcall(struct pt_regs *regs);
108*4882a593Smuzhiyun void xen_hvm_evtchn_do_upcall(void);
109*4882a593Smuzhiyun
110*4882a593Smuzhiyun /* Bind a pirq for a physical interrupt to an irq. */
111*4882a593Smuzhiyun int xen_bind_pirq_gsi_to_irq(unsigned gsi,
112*4882a593Smuzhiyun unsigned pirq, int shareable, char *name);
113*4882a593Smuzhiyun
114*4882a593Smuzhiyun #ifdef CONFIG_PCI_MSI
115*4882a593Smuzhiyun /* Allocate a pirq for a MSI style physical interrupt. */
116*4882a593Smuzhiyun int xen_allocate_pirq_msi(struct pci_dev *dev, struct msi_desc *msidesc);
117*4882a593Smuzhiyun /* Bind an PSI pirq to an irq. */
118*4882a593Smuzhiyun int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc,
119*4882a593Smuzhiyun int pirq, int nvec, const char *name, domid_t domid);
120*4882a593Smuzhiyun #endif
121*4882a593Smuzhiyun
122*4882a593Smuzhiyun /* De-allocates the above mentioned physical interrupt. */
123*4882a593Smuzhiyun int xen_destroy_irq(int irq);
124*4882a593Smuzhiyun
125*4882a593Smuzhiyun /* Return irq from pirq */
126*4882a593Smuzhiyun int xen_irq_from_pirq(unsigned pirq);
127*4882a593Smuzhiyun
128*4882a593Smuzhiyun /* Return the pirq allocated to the irq. */
129*4882a593Smuzhiyun int xen_pirq_from_irq(unsigned irq);
130*4882a593Smuzhiyun
131*4882a593Smuzhiyun /* Return the irq allocated to the gsi */
132*4882a593Smuzhiyun int xen_irq_from_gsi(unsigned gsi);
133*4882a593Smuzhiyun
134*4882a593Smuzhiyun /* Determine whether to ignore this IRQ if it is passed to a guest. */
135*4882a593Smuzhiyun int xen_test_irq_shared(int irq);
136*4882a593Smuzhiyun
137*4882a593Smuzhiyun /* initialize Xen IRQ subsystem */
138*4882a593Smuzhiyun void xen_init_IRQ(void);
139*4882a593Smuzhiyun #endif /* _XEN_EVENTS_H */
140