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