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(unsigned int evtchn); 18 int bind_evtchn_to_irqhandler(unsigned int evtchn, 19 irq_handler_t handler, 20 unsigned long irqflags, const char *devname, 21 void *dev_id); 22 int bind_virq_to_irq(unsigned int virq, unsigned int cpu, bool percpu); 23 int bind_virq_to_irqhandler(unsigned int virq, unsigned int cpu, 24 irq_handler_t handler, 25 unsigned long irqflags, const char *devname, 26 void *dev_id); 27 int bind_ipi_to_irqhandler(enum ipi_vector ipi, 28 unsigned int cpu, 29 irq_handler_t handler, 30 unsigned long irqflags, 31 const char *devname, 32 void *dev_id); 33 int bind_interdomain_evtchn_to_irq(unsigned int remote_domain, 34 unsigned int remote_port); 35 int bind_interdomain_evtchn_to_irqhandler(unsigned int remote_domain, 36 unsigned int remote_port, 37 irq_handler_t handler, 38 unsigned long irqflags, 39 const char *devname, 40 void *dev_id); 41 42 /* 43 * Common unbind function for all event sources. Takes IRQ to unbind from. 44 * Automatically closes the underlying event channel (even for bindings 45 * made with bind_evtchn_to_irqhandler()). 46 */ 47 void unbind_from_irqhandler(unsigned int irq, void *dev_id); 48 49 #define XEN_IRQ_PRIORITY_MAX EVTCHN_FIFO_PRIORITY_MAX 50 #define XEN_IRQ_PRIORITY_DEFAULT EVTCHN_FIFO_PRIORITY_DEFAULT 51 #define XEN_IRQ_PRIORITY_MIN EVTCHN_FIFO_PRIORITY_MIN 52 int xen_set_irq_priority(unsigned irq, unsigned priority); 53 54 /* 55 * Allow extra references to event channels exposed to userspace by evtchn 56 */ 57 int evtchn_make_refcounted(unsigned int evtchn); 58 int evtchn_get(unsigned int evtchn); 59 void evtchn_put(unsigned int evtchn); 60 61 void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector); 62 void rebind_evtchn_irq(int evtchn, int irq); 63 int xen_set_affinity_evtchn(struct irq_desc *desc, unsigned int tcpu); 64 65 static inline void notify_remote_via_evtchn(int port) 66 { 67 struct evtchn_send send = { .port = port }; 68 (void)HYPERVISOR_event_channel_op(EVTCHNOP_send, &send); 69 } 70 71 void notify_remote_via_irq(int irq); 72 73 void xen_irq_resume(void); 74 75 /* Clear an irq's pending state, in preparation for polling on it */ 76 void xen_clear_irq_pending(int irq); 77 void xen_set_irq_pending(int irq); 78 bool xen_test_irq_pending(int irq); 79 80 /* Poll waiting for an irq to become pending. In the usual case, the 81 irq will be disabled so it won't deliver an interrupt. */ 82 void xen_poll_irq(int irq); 83 84 /* Poll waiting for an irq to become pending with a timeout. In the usual case, 85 * the irq will be disabled so it won't deliver an interrupt. */ 86 void xen_poll_irq_timeout(int irq, u64 timeout); 87 88 /* Determine the IRQ which is bound to an event channel */ 89 unsigned irq_from_evtchn(unsigned int evtchn); 90 int irq_from_virq(unsigned int cpu, unsigned int virq); 91 unsigned int evtchn_from_irq(unsigned irq); 92 93 #ifdef CONFIG_XEN_PVHVM 94 /* Xen HVM evtchn vector callback */ 95 void xen_hvm_callback_vector(void); 96 #ifdef CONFIG_TRACING 97 #define trace_xen_hvm_callback_vector xen_hvm_callback_vector 98 #endif 99 #endif 100 int xen_set_callback_via(uint64_t via); 101 void xen_evtchn_do_upcall(struct pt_regs *regs); 102 void xen_hvm_evtchn_do_upcall(void); 103 104 /* Bind a pirq for a physical interrupt to an irq. */ 105 int xen_bind_pirq_gsi_to_irq(unsigned gsi, 106 unsigned pirq, int shareable, char *name); 107 108 #ifdef CONFIG_PCI_MSI 109 /* Allocate a pirq for a MSI style physical interrupt. */ 110 int xen_allocate_pirq_msi(struct pci_dev *dev, struct msi_desc *msidesc); 111 /* Bind an PSI pirq to an irq. */ 112 int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc, 113 int pirq, int nvec, const char *name, domid_t domid); 114 #endif 115 116 /* De-allocates the above mentioned physical interrupt. */ 117 int xen_destroy_irq(int irq); 118 119 /* Return irq from pirq */ 120 int xen_irq_from_pirq(unsigned pirq); 121 122 /* Return the pirq allocated to the irq. */ 123 int xen_pirq_from_irq(unsigned irq); 124 125 /* Return the irq allocated to the gsi */ 126 int xen_irq_from_gsi(unsigned gsi); 127 128 /* Determine whether to ignore this IRQ if it is passed to a guest. */ 129 int xen_test_irq_shared(int irq); 130 131 /* initialize Xen IRQ subsystem */ 132 void xen_init_IRQ(void); 133 #endif /* _XEN_EVENTS_H */ 134