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 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