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