| rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 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 | /* Xen HVM evtchn vector callback */ |
| 94 | void xen_hvm_callback_vector(void); |
| 95 | #ifdef CONFIG_TRACING |
| 96 | #define trace_xen_hvm_callback_vector xen_hvm_callback_vector |
| 97 | #endif |
| 98 | int xen_set_callback_via(uint64_t via); |
| 99 | void xen_evtchn_do_upcall(struct pt_regs *regs); |
| 100 | void xen_hvm_evtchn_do_upcall(void); |
| 101 | |
| 102 | /* Bind a pirq for a physical interrupt to an irq. */ |
| 103 | int xen_bind_pirq_gsi_to_irq(unsigned gsi, |
| 104 | unsigned pirq, int shareable, char *name); |
| 105 | |
| 106 | #ifdef CONFIG_PCI_MSI |
| 107 | /* Allocate a pirq for a MSI style physical interrupt. */ |
| 108 | int xen_allocate_pirq_msi(struct pci_dev *dev, struct msi_desc *msidesc); |
| 109 | /* Bind an PSI pirq to an irq. */ |
| 110 | int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc, |
| 111 | int pirq, int nvec, const char *name, domid_t domid); |
| 112 | #endif |
| 113 | |
| 114 | /* De-allocates the above mentioned physical interrupt. */ |
| 115 | int xen_destroy_irq(int irq); |
| 116 | |
| 117 | /* Return irq from pirq */ |
| 118 | int xen_irq_from_pirq(unsigned pirq); |
| 119 | |
| 120 | /* Return the pirq allocated to the irq. */ |
| 121 | int xen_pirq_from_irq(unsigned irq); |
| 122 | |
| 123 | /* Return the irq allocated to the gsi */ |
| 124 | int xen_irq_from_gsi(unsigned gsi); |
| 125 | |
| 126 | /* Determine whether to ignore this IRQ if it is passed to a guest. */ |
| 127 | int xen_test_irq_shared(int irq); |
| 128 | |
| 129 | /* initialize Xen IRQ subsystem */ |
| 130 | void xen_init_IRQ(void); |
| 131 | #endif /* _XEN_EVENTS_H */ |