include/xen/events.h

   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 #ifdef CONFIG_XEN_PVHVM
  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 #endif
  99 int xen_set_callback_via(uint64_t via);
 100 void xen_evtchn_do_upcall(struct pt_regs *regs);
 101 void xen_hvm_evtchn_do_upcall(void);
 102
 103 /* Bind a pirq for a physical interrupt to an irq. */
 104 int xen_bind_pirq_gsi_to_irq(unsigned gsi,
 105                              unsigned pirq, int shareable, char *name);
 106
 107 #ifdef CONFIG_PCI_MSI
 108 /* Allocate a pirq for a MSI style physical interrupt. */
 109 int xen_allocate_pirq_msi(struct pci_dev *dev, struct msi_desc *msidesc);
 110 /* Bind an PSI pirq to an irq. */
 111 int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc,
 112                              int pirq, int nvec, const char *name, domid_t domid);
 113 #endif
 114
 115 /* De-allocates the above mentioned physical interrupt. */
 116 int xen_destroy_irq(int irq);
 117
 118 /* Return irq from pirq */
 119 int xen_irq_from_pirq(unsigned pirq);
 120
 121 /* Return the pirq allocated to the irq. */
 122 int xen_pirq_from_irq(unsigned irq);
 123
 124 /* Return the irq allocated to the gsi */
 125 int xen_irq_from_gsi(unsigned gsi);
 126
 127 /* Determine whether to ignore this IRQ if it is passed to a guest. */
 128 int xen_test_irq_shared(int irq);
 129
 130 /* initialize Xen IRQ subsystem */
 131 void xen_init_IRQ(void);
 132 #endif  /* _XEN_EVENTS_H */