include/xen/events.h

   1 #ifndef _XEN_EVENTS_H
   2 #define _XEN_EVENTS_H
   3
   4 #include <linux/interrupt.h>
   5 #ifdef CONFIG_PCI_MSI
   6 #include <linux/msi.h>
   7 #endif
   8
   9 #include <xen/interface/event_channel.h>
  10 #include <asm/xen/hypercall.h>
  11 #include <asm/xen/events.h>
  12
  13 unsigned xen_evtchn_nr_channels(void);
  14
  15 int bind_evtchn_to_irq(unsigned int evtchn);
  16 int bind_evtchn_to_irqhandler(unsigned int evtchn,
  17                               irq_handler_t handler,
  18                               unsigned long irqflags, const char *devname,
  19                               void *dev_id);
  20 int bind_virq_to_irq(unsigned int virq, unsigned int cpu, bool percpu);
  21 int bind_virq_to_irqhandler(unsigned int virq, unsigned int cpu,
  22                             irq_handler_t handler,
  23                             unsigned long irqflags, const char *devname,
  24                             void *dev_id);
  25 int bind_ipi_to_irqhandler(enum ipi_vector ipi,
  26                            unsigned int cpu,
  27                            irq_handler_t handler,
  28                            unsigned long irqflags,
  29                            const char *devname,
  30                            void *dev_id);
  31 int bind_interdomain_evtchn_to_irq(unsigned int remote_domain,
  32                                    unsigned int remote_port);
  33 int bind_interdomain_evtchn_to_irqhandler(unsigned int remote_domain,
  34                                           unsigned int remote_port,
  35                                           irq_handler_t handler,
  36                                           unsigned long irqflags,
  37                                           const char *devname,
  38                                           void *dev_id);
  39
  40 /*
  41  * Common unbind function for all event sources. Takes IRQ to unbind from.
  42  * Automatically closes the underlying event channel (even for bindings
  43  * made with bind_evtchn_to_irqhandler()).
  44  */
  45 void unbind_from_irqhandler(unsigned int irq, void *dev_id);
  46
  47 #define XEN_IRQ_PRIORITY_MAX     EVTCHN_FIFO_PRIORITY_MAX
  48 #define XEN_IRQ_PRIORITY_DEFAULT EVTCHN_FIFO_PRIORITY_DEFAULT
  49 #define XEN_IRQ_PRIORITY_MIN     EVTCHN_FIFO_PRIORITY_MIN
  50 int xen_set_irq_priority(unsigned irq, unsigned priority);
  51
  52 /*
  53  * Allow extra references to event channels exposed to userspace by evtchn
  54  */
  55 int evtchn_make_refcounted(unsigned int evtchn);
  56 int evtchn_get(unsigned int evtchn);
  57 void evtchn_put(unsigned int evtchn);
  58
  59 void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector);
  60 void rebind_evtchn_irq(int evtchn, int irq);
  61
  62 static inline void notify_remote_via_evtchn(int port)
  63 {
  64         struct evtchn_send send = { .port = port };
  65         (void)HYPERVISOR_event_channel_op(EVTCHNOP_send, &send);
  66 }
  67
  68 void notify_remote_via_irq(int irq);
  69
  70 void xen_irq_resume(void);
  71
  72 /* Clear an irq's pending state, in preparation for polling on it */
  73 void xen_clear_irq_pending(int irq);
  74 void xen_set_irq_pending(int irq);
  75 bool xen_test_irq_pending(int irq);
  76
  77 /* Poll waiting for an irq to become pending.  In the usual case, the
  78    irq will be disabled so it won't deliver an interrupt. */
  79 void xen_poll_irq(int irq);
  80
  81 /* Poll waiting for an irq to become pending with a timeout.  In the usual case,
  82  * the irq will be disabled so it won't deliver an interrupt. */
  83 void xen_poll_irq_timeout(int irq, u64 timeout);
  84
  85 /* Determine the IRQ which is bound to an event channel */
  86 unsigned irq_from_evtchn(unsigned int evtchn);
  87 int irq_from_virq(unsigned int cpu, unsigned int virq);
  88 unsigned int evtchn_from_irq(unsigned irq);
  89
  90 /* Xen HVM evtchn vector callback */
  91 void xen_hvm_callback_vector(void);
  92 #ifdef CONFIG_TRACING
  93 #define trace_xen_hvm_callback_vector xen_hvm_callback_vector
  94 #endif
  95 int xen_set_callback_via(uint64_t via);
  96 void xen_evtchn_do_upcall(struct pt_regs *regs);
  97 void xen_hvm_evtchn_do_upcall(void);
  98
  99 /* Bind a pirq for a physical interrupt to an irq. */
 100 int xen_bind_pirq_gsi_to_irq(unsigned gsi,
 101                              unsigned pirq, int shareable, char *name);
 102
 103 #ifdef CONFIG_PCI_MSI
 104 /* Allocate a pirq for a MSI style physical interrupt. */
 105 int xen_allocate_pirq_msi(struct pci_dev *dev, struct msi_desc *msidesc);
 106 /* Bind an PSI pirq to an irq. */
 107 int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc,
 108                              int pirq, int nvec, const char *name, domid_t domid);
 109 #endif
 110
 111 /* De-allocates the above mentioned physical interrupt. */
 112 int xen_destroy_irq(int irq);
 113
 114 /* Return irq from pirq */
 115 int xen_irq_from_pirq(unsigned pirq);
 116
 117 /* Return the pirq allocated to the irq. */
 118 int xen_pirq_from_irq(unsigned irq);
 119
 120 /* Return the irq allocated to the gsi */
 121 int xen_irq_from_gsi(unsigned gsi);
 122
 123 /* Determine whether to ignore this IRQ if it is passed to a guest. */
 124 int xen_test_irq_shared(int irq);
 125
 126 /* initialize Xen IRQ subsystem */
 127 void xen_init_IRQ(void);
 128 #endif  /* _XEN_EVENTS_H */