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 #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_irq_lateeoi(evtchn_port_t evtchn);
  21 int bind_evtchn_to_irqhandler(evtchn_port_t evtchn,
  22                               irq_handler_t handler,
  23                               unsigned long irqflags, const char *devname,
  24                               void *dev_id);
  25 int bind_evtchn_to_irqhandler_lateeoi(evtchn_port_t evtchn,
  26                               irq_handler_t handler,
  27                               unsigned long irqflags, const char *devname,
  28                               void *dev_id);
  29 int bind_virq_to_irq(unsigned int virq, unsigned int cpu, bool percpu);
  30 int bind_virq_to_irqhandler(unsigned int virq, unsigned int cpu,
  31                             irq_handler_t handler,
  32                             unsigned long irqflags, const char *devname,
  33                             void *dev_id);
  34 int bind_ipi_to_irqhandler(enum ipi_vector ipi,
  35                            unsigned int cpu,
  36                            irq_handler_t handler,
  37                            unsigned long irqflags,
  38                            const char *devname,
  39                            void *dev_id);
  40 int bind_interdomain_evtchn_to_irq_lateeoi(struct xenbus_device *dev,
  41                                            evtchn_port_t remote_port);
  42 int bind_interdomain_evtchn_to_irqhandler_lateeoi(struct xenbus_device *dev,
  43                                                   evtchn_port_t remote_port,
  44                                                   irq_handler_t handler,
  45                                                   unsigned long irqflags,
  46                                                   const char *devname,
  47                                                   void *dev_id);
  48
  49 /*
  50  * Common unbind function for all event sources. Takes IRQ to unbind from.
  51  * Automatically closes the underlying event channel (even for bindings
  52  * made with bind_evtchn_to_irqhandler()).
  53  */
  54 void unbind_from_irqhandler(unsigned int irq, void *dev_id);
  55
  56 /*
  57  * Send late EOI for an IRQ bound to an event channel via one of the *_lateeoi
  58  * functions above.
  59  */
  60 void xen_irq_lateeoi(unsigned int irq, unsigned int eoi_flags);
  61 /* Signal an event was spurious, i.e. there was no action resulting from it. */
  62 #define XEN_EOI_FLAG_SPURIOUS   0x00000001
  63
  64 #define XEN_IRQ_PRIORITY_MAX     EVTCHN_FIFO_PRIORITY_MAX
  65 #define XEN_IRQ_PRIORITY_DEFAULT EVTCHN_FIFO_PRIORITY_DEFAULT
  66 #define XEN_IRQ_PRIORITY_MIN     EVTCHN_FIFO_PRIORITY_MIN
  67 int xen_set_irq_priority(unsigned irq, unsigned priority);
  68
  69 /*
  70  * Allow extra references to event channels exposed to userspace by evtchn
  71  */
  72 int evtchn_make_refcounted(evtchn_port_t evtchn, bool is_static);
  73 int evtchn_get(evtchn_port_t evtchn);
  74 void evtchn_put(evtchn_port_t evtchn);
  75
  76 void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector);
  77 void rebind_evtchn_irq(evtchn_port_t evtchn, int irq);
  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 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_evtchn_from_virq(unsigned int cpu, unsigned int virq,
 104                          evtchn_port_t *evtchn);
 105
 106 int xen_set_callback_via(uint64_t via);
 107 int xen_evtchn_do_upcall(void);
 108
 109 /* Bind a pirq for a physical interrupt to an irq. */
 110 int xen_bind_pirq_gsi_to_irq(unsigned gsi,
 111                              unsigned pirq, int shareable, char *name);
 112
 113 #ifdef CONFIG_PCI_MSI
 114 /* Allocate a pirq for a MSI style physical interrupt. */
 115 int xen_allocate_pirq_msi(struct pci_dev *dev, struct msi_desc *msidesc);
 116 /* Bind an PSI pirq to an irq. */
 117 int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc,
 118                              int pirq, int nvec, const char *name, domid_t domid);
 119 #endif
 120
 121 /* De-allocates the above mentioned physical interrupt. */
 122 int xen_destroy_irq(int irq);
 123
 124 /* Return the pirq allocated to the irq. */
 125 int xen_pirq_from_irq(unsigned irq);
 126
 127 /* Return the irq allocated to the gsi */
 128 int xen_irq_from_gsi(unsigned gsi);
 129
 130 /* Determine whether to ignore this IRQ if it is passed to a guest. */
 131 int xen_test_irq_shared(int irq);
 132
 133 /* initialize Xen IRQ subsystem */
 134 void xen_init_IRQ(void);
 135
 136 irqreturn_t xen_debug_interrupt(int irq, void *dev_id);
 137
 138 static inline void xen_evtchn_close(evtchn_port_t port)
 139 {
 140         struct evtchn_close close;
 141
 142         close.port = port;
 143         if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0)
 144                 BUG();
 145 }
 146
 147 extern bool xen_fifo_events;
 148
 149 #endif  /* _XEN_EVENTS_H */