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