44e06d158a
This patch adds support for MSI interrupts when running on Xen. Apart from adding the Xen related code needed in order to register MSI interrupts this patch also makes the msi_init function a hook in init_ops, so different MSI implementations can have different initialization functions. Sponsored by: Citrix Systems R&D xen/interface/physdev.h: - Add the MAP_PIRQ_TYPE_MULTI_MSI to map multi-vector MSI to the Xen public interface. x86/include/init.h: - Add a hook for setting custom msi_init methods. amd64/amd64/machdep.c: i386/i386/machdep.c: - Set the default msi_init hook to point to the native MSI initialization method. x86/xen/pv.c: - Set the Xen MSI init hook when running as a Xen guest. x86/x86/local_apic.c: - Call the msi_init hook instead of directly calling msi_init. xen/xen_intr.h: x86/xen/xen_intr.c: - Introduce support for registering/releasing MSI interrupts with Xen. - The MSI interrupts will use the same PIC as the IO APIC interrupts. xen/xen_msi.h: x86/xen/xen_msi.c: - Introduce a Xen MSI implementation. x86/xen/xen_nexus.c: - Overwrite the default MSI hooks in the Xen Nexus to use the Xen MSI implementation. x86/xen/xen_pci.c: - Introduce a Xen specific PCI bus that inherits from the ACPI PCI bus and overwrites the native MSI methods. - This is needed because when running under Xen the MSI messages used to configure MSI interrupts on PCI devices are written by Xen itself. dev/acpica/acpi_pci.c: - Lower the quality of the ACPI PCI bus so the newly introduced Xen PCI bus can take over when needed. conf/files.i386: conf/files.amd64: - Add the newly created files to the build process.
250 lines
9.5 KiB
C
250 lines
9.5 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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#endif /* _XEN_INTR_H_ */
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