/****************************************************************************** * xen_intr.h * * APIs for managing Xen event channel, virtual IRQ, and physical IRQ * notifications. * * Copyright (c) 2004, K A Fraser * Copyright (c) 2012, Spectra Logic Corporation * * This file may be distributed separately from the Linux kernel, or * incorporated into other software packages, subject to the following license: * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this source file (the "Software"), to deal in the Software without * restriction, including without limitation the rights to use, copy, modify, * merge, publish, distribute, sublicense, and/or sell copies of the Software, * and to permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS * IN THE SOFTWARE. * * $FreeBSD$ */ #ifndef _XEN_INTR_H_ #define _XEN_INTR_H_ #ifndef __XEN_EVTCHN_PORT_DEFINED__ typedef uint32_t evtchn_port_t; DEFINE_XEN_GUEST_HANDLE(evtchn_port_t); #define __XEN_EVTCHN_PORT_DEFINED__ 1 #endif /** Registered Xen interrupt callback handle. */ typedef void * xen_intr_handle_t; /** If non-zero, the hypervisor has been configured to use a direct vector */ extern int xen_vector_callback_enabled; /** * Associate an already allocated local event channel port an interrupt * handler. * * \param dev The device making this bind request. * \param local_port The event channel to bind. * \param filter An interrupt filter handler. Specify NULL * to always dispatch to the ithread handler. * \param handler An interrupt ithread handler. Optional (can * specify NULL) if all necessary event actions * are performed by filter. * \param arg Argument to present to both filter and handler. * \param irqflags Interrupt handler flags. See sys/bus.h. * \param handlep Pointer to an opaque handle used to manage this * registration. * * \returns 0 on success, otherwise an errno. */ int xen_intr_bind_local_port(device_t dev, evtchn_port_t local_port, driver_filter_t filter, driver_intr_t handler, void *arg, enum intr_type irqflags, xen_intr_handle_t *handlep); /** * Allocate a local event channel port, accessible by the specified * remote/foreign domain and, if successful, associate the port with * the specified interrupt handler. * * \param dev The device making this bind request. * \param remote_domain Remote domain grant permission to signal the * newly allocated local port. * \param filter An interrupt filter handler. Specify NULL * to always dispatch to the ithread handler. * \param handler An interrupt ithread handler. Optional (can * specify NULL) if all necessary event actions * are performed by filter. * \param arg Argument to present to both filter and handler. * \param irqflags Interrupt handler flags. See sys/bus.h. * \param handlep Pointer to an opaque handle used to manage this * registration. * * \returns 0 on success, otherwise an errno. */ int xen_intr_alloc_and_bind_local_port(device_t dev, u_int remote_domain, driver_filter_t filter, driver_intr_t handler, void *arg, enum intr_type irqflags, xen_intr_handle_t *handlep); /** * Associate the specified interrupt handler with the remote event * channel port specified by remote_domain and remote_port. * * \param dev The device making this bind request. * \param remote_domain The domain peer for this event channel connection. * \param remote_port Remote domain's local port number for this event * channel port. * \param filter An interrupt filter handler. Specify NULL * to always dispatch to the ithread handler. * \param handler An interrupt ithread handler. Optional (can * specify NULL) if all necessary event actions * are performed by filter. * \param arg Argument to present to both filter and handler. * \param irqflags Interrupt handler flags. See sys/bus.h. * \param handlep Pointer to an opaque handle used to manage this * registration. * * \returns 0 on success, otherwise an errno. */ int xen_intr_bind_remote_port(device_t dev, u_int remote_domain, evtchn_port_t remote_port, driver_filter_t filter, driver_intr_t handler, void *arg, enum intr_type irqflags, xen_intr_handle_t *handlep); /** * Associate the specified interrupt handler with the specified Xen * virtual interrupt source. * * \param dev The device making this bind request. * \param virq The Xen virtual IRQ number for the Xen interrupt * source being hooked. * \param cpu The cpu on which interrupt events should be delivered. * \param filter An interrupt filter handler. Specify NULL * to always dispatch to the ithread handler. * \param handler An interrupt ithread handler. Optional (can * specify NULL) if all necessary event actions * are performed by filter. * \param arg Argument to present to both filter and handler. * \param irqflags Interrupt handler flags. See sys/bus.h. * \param handlep Pointer to an opaque handle used to manage this * registration. * * \returns 0 on success, otherwise an errno. */ int xen_intr_bind_virq(device_t dev, u_int virq, u_int cpu, driver_filter_t filter, driver_intr_t handler, void *arg, enum intr_type irqflags, xen_intr_handle_t *handlep); /** * Allocate a local event channel port for servicing interprocessor * interupts and, if successful, associate the port with the specified * interrupt handler. * * \param dev The device making this bind request. * \param cpu The cpu receiving the IPI. * \param filter The interrupt filter servicing this IPI. * \param irqflags Interrupt handler flags. See sys/bus.h. * \param handlep Pointer to an opaque handle used to manage this * registration. * * \returns 0 on success, otherwise an errno. */ int xen_intr_alloc_and_bind_ipi(device_t dev, u_int cpu, driver_filter_t filter, enum intr_type irqflags, xen_intr_handle_t *handlep); /** * Unbind an interrupt handler from its interrupt source. * * \param handlep A pointer to the opaque handle that was initialized * at the time the interrupt source was bound. * * \returns 0 on success, otherwise an errno. * * \note The event channel, if any, that was allocated at bind time is * closed upon successful return of this method. * * \note It is always safe to call xen_intr_unbind() on a handle that * has been initilized to NULL. */ void xen_intr_unbind(xen_intr_handle_t *handle); /** * Add a description to an interrupt handler. * * \param handle The opaque handle that was initialized at the time * the interrupt source was bound. * * \param fmt The sprintf compatible format string for the description, * followed by optional sprintf arguments. * * \returns 0 on success, otherwise an errno. */ int xen_intr_describe(xen_intr_handle_t port_handle, const char *fmt, ...) __attribute__((format(printf, 2, 3))); /** * Signal the remote peer of an interrupt source associated with an * event channel port. * * \param handle The opaque handle that was initialized at the time * the interrupt source was bound. * * \note For xen interrupt sources other than event channel ports, * this method takes no action. */ void xen_intr_signal(xen_intr_handle_t handle); /** * Get the local event channel port number associated with this interrupt * source. * * \param handle The opaque handle that was initialized at the time * the interrupt source was bound. * * \returns 0 if the handle is invalid, otherwise positive port number. */ evtchn_port_t xen_intr_port(xen_intr_handle_t handle); #endif /* _XEN_INTR_H_ */