6d54cab1fe
This is needed by the event channel user-space device, that requires registering event channels without unmasking them. intr_add_handler will unconditionally unmask the event channel, so we avoid calling it if no filter/handler is provided, and then the user will be in charge of calling it when ready. In order to do this, we need to change the opaque type xen_intr_handle_t to contain the event channel port instead of the opaque cookie returned by intr_add_handler, since now registration of event channels without handlers are allowed. The cookie will now be stored inside of the private xenisrc struct. Also, introduce a new function called xen_intr_add_handler that allows adding a filter/handler after the event channel has been registered. Sponsored by: Citrix Systems R&D x86/xen/xen_intr.c: - Leave the event channel without a handler if no filter/handler is provided to xen_intr_bind_isrc. - Don't perform an evtchn_mask_port, intr_add_handler will already do it. - Change the opaque type xen_intr_handle_t to contain a pointer to the event channel port number, and make the necessary changes to related functions. - Introduce a new function called xen_intr_add_handler that can be used to add filter/handlers to an event channel after registration. xen/xen_intr.h: - Add prototype of xen_intr_add_handler.
269 lines
10 KiB
C
269 lines
10 KiB
C
/******************************************************************************
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* xen_intr.h
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*
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* APIs for managing Xen event channel, virtual IRQ, and physical IRQ
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* notifications.
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*
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* Copyright (c) 2004, K A Fraser
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* Copyright (c) 2012, Spectra Logic Corporation
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*
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* This file may be distributed separately from the Linux kernel, or
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* incorporated into other software packages, subject to the following license:
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this source file (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy, modify,
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* merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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* $FreeBSD$
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*/
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#ifndef _XEN_INTR_H_
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#define _XEN_INTR_H_
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#ifndef __XEN_EVTCHN_PORT_DEFINED__
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typedef uint32_t evtchn_port_t;
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DEFINE_XEN_GUEST_HANDLE(evtchn_port_t);
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#define __XEN_EVTCHN_PORT_DEFINED__ 1
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#endif
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/** Registered Xen interrupt callback handle. */
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typedef void * xen_intr_handle_t;
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/** If non-zero, the hypervisor has been configured to use a direct vector */
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extern int xen_vector_callback_enabled;
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/**
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* Associate an already allocated local event channel port an interrupt
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* handler.
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*
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* \param dev The device making this bind request.
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* \param local_port The event channel to bind.
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* \param filter An interrupt filter handler. Specify NULL
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* to always dispatch to the ithread handler.
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* \param handler An interrupt ithread handler. Optional (can
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* specify NULL) if all necessary event actions
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* are performed by filter.
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* \param arg Argument to present to both filter and handler.
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* \param irqflags Interrupt handler flags. See sys/bus.h.
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* \param handlep Pointer to an opaque handle used to manage this
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* registration.
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*
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* \returns 0 on success, otherwise an errno.
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*/
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int xen_intr_bind_local_port(device_t dev, evtchn_port_t local_port,
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driver_filter_t filter, driver_intr_t handler, void *arg,
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enum intr_type irqflags, xen_intr_handle_t *handlep);
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/**
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* Allocate a local event channel port, accessible by the specified
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* remote/foreign domain and, if successful, associate the port with
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* the specified interrupt handler.
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*
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* \param dev The device making this bind request.
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* \param remote_domain Remote domain grant permission to signal the
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* newly allocated local port.
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* \param filter An interrupt filter handler. Specify NULL
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* to always dispatch to the ithread handler.
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* \param handler An interrupt ithread handler. Optional (can
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* specify NULL) if all necessary event actions
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* are performed by filter.
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* \param arg Argument to present to both filter and handler.
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* \param irqflags Interrupt handler flags. See sys/bus.h.
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* \param handlep Pointer to an opaque handle used to manage this
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* registration.
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*
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* \returns 0 on success, otherwise an errno.
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*/
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int xen_intr_alloc_and_bind_local_port(device_t dev,
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u_int remote_domain, driver_filter_t filter, driver_intr_t handler,
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void *arg, enum intr_type irqflags, xen_intr_handle_t *handlep);
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/**
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* Associate the specified interrupt handler with the remote event
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* channel port specified by remote_domain and remote_port.
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*
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* \param dev The device making this bind request.
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* \param remote_domain The domain peer for this event channel connection.
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* \param remote_port Remote domain's local port number for this event
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* channel port.
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* \param filter An interrupt filter handler. Specify NULL
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* to always dispatch to the ithread handler.
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* \param handler An interrupt ithread handler. Optional (can
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* specify NULL) if all necessary event actions
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* are performed by filter.
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* \param arg Argument to present to both filter and handler.
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* \param irqflags Interrupt handler flags. See sys/bus.h.
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* \param handlep Pointer to an opaque handle used to manage this
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* registration.
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*
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* \returns 0 on success, otherwise an errno.
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*/
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int xen_intr_bind_remote_port(device_t dev, u_int remote_domain,
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evtchn_port_t remote_port, driver_filter_t filter,
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driver_intr_t handler, void *arg, enum intr_type irqflags,
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xen_intr_handle_t *handlep);
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/**
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* Associate the specified interrupt handler with the specified Xen
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* virtual interrupt source.
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*
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* \param dev The device making this bind request.
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* \param virq The Xen virtual IRQ number for the Xen interrupt
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* source being hooked.
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* \param cpu The cpu on which interrupt events should be delivered.
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* \param filter An interrupt filter handler. Specify NULL
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* to always dispatch to the ithread handler.
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* \param handler An interrupt ithread handler. Optional (can
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* specify NULL) if all necessary event actions
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* are performed by filter.
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* \param arg Argument to present to both filter and handler.
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* \param irqflags Interrupt handler flags. See sys/bus.h.
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* \param handlep Pointer to an opaque handle used to manage this
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* registration.
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*
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* \returns 0 on success, otherwise an errno.
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*/
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int xen_intr_bind_virq(device_t dev, u_int virq, u_int cpu,
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driver_filter_t filter, driver_intr_t handler,
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void *arg, enum intr_type irqflags, xen_intr_handle_t *handlep);
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/**
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* Allocate a local event channel port for servicing interprocessor
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* interupts and, if successful, associate the port with the specified
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* interrupt handler.
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*
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* \param dev The device making this bind request.
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* \param cpu The cpu receiving the IPI.
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* \param filter The interrupt filter servicing this IPI.
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* \param irqflags Interrupt handler flags. See sys/bus.h.
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* \param handlep Pointer to an opaque handle used to manage this
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* registration.
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*
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* \returns 0 on success, otherwise an errno.
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*/
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int xen_intr_alloc_and_bind_ipi(device_t dev, u_int cpu,
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driver_filter_t filter, enum intr_type irqflags,
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xen_intr_handle_t *handlep);
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/**
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* Register a physical interrupt vector and setup the interrupt source.
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*
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* \param vector The global vector to use.
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* \param trig Default trigger method.
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* \param pol Default polarity of the interrupt.
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*
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* \returns 0 on success, otherwise an errno.
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*/
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int xen_register_pirq(int vector, enum intr_trigger trig,
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enum intr_polarity pol);
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/**
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* Unbind an interrupt handler from its interrupt source.
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*
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* \param handlep A pointer to the opaque handle that was initialized
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* at the time the interrupt source was bound.
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*
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* \returns 0 on success, otherwise an errno.
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*
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* \note The event channel, if any, that was allocated at bind time is
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* closed upon successful return of this method.
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*
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* \note It is always safe to call xen_intr_unbind() on a handle that
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* has been initilized to NULL.
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*/
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void xen_intr_unbind(xen_intr_handle_t *handle);
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/**
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* Add a description to an interrupt handler.
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*
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* \param handle The opaque handle that was initialized at the time
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* the interrupt source was bound.
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*
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* \param fmt The sprintf compatible format string for the description,
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* followed by optional sprintf arguments.
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*
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* \returns 0 on success, otherwise an errno.
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*/
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int
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xen_intr_describe(xen_intr_handle_t port_handle, const char *fmt, ...)
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__attribute__((format(printf, 2, 3)));
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/**
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* Signal the remote peer of an interrupt source associated with an
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* event channel port.
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*
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* \param handle The opaque handle that was initialized at the time
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* the interrupt source was bound.
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*
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* \note For xen interrupt sources other than event channel ports,
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* this method takes no action.
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*/
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void xen_intr_signal(xen_intr_handle_t handle);
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/**
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* Get the local event channel port number associated with this interrupt
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* source.
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*
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* \param handle The opaque handle that was initialized at the time
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* the interrupt source was bound.
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*
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* \returns 0 if the handle is invalid, otherwise positive port number.
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*/
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evtchn_port_t xen_intr_port(xen_intr_handle_t handle);
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/**
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* Setup MSI vector interrupt(s).
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*
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* \param dev The device that requests the binding.
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*
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* \param vector Requested initial vector to bind the MSI interrupt(s) to.
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*
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* \param count Number of vectors to allocate.
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*
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* \returns 0 on success, otherwise an errno.
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*/
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int xen_register_msi(device_t dev, int vector, int count);
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/**
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* Teardown a MSI vector interrupt.
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*
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* \param vector Requested vector to release.
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*
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* \returns 0 on success, otherwise an errno.
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*/
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int xen_release_msi(int vector);
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/**
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* Bind an event channel port with a handler
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*
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* \param dev The device making this bind request.
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* \param filter An interrupt filter handler. Specify NULL
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* to always dispatch to the ithread handler.
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* \param handler An interrupt ithread handler. Optional (can
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* specify NULL) if all necessary event actions
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* are performed by filter.
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* \param arg Argument to present to both filter and handler.
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* \param irqflags Interrupt handler flags. See sys/bus.h.
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* \param handle Opaque handle used to manage this registration.
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*
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* \returns 0 on success, otherwise an errno.
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*/
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int xen_intr_add_handler(device_t dev, driver_filter_t filter,
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driver_intr_t handler, void *arg, enum intr_type flags,
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xen_intr_handle_t handle);
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#endif /* _XEN_INTR_H_ */
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