196 lines
6.3 KiB
C
196 lines
6.3 KiB
C
/******************************************************************************
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* Talks to Xen Store to figure out what devices we have.
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*
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* Copyright (C) 2009, 2010 Spectra Logic Corporation
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* Copyright (C) 2008 Doug Rabson
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* Copyright (C) 2005 Rusty Russell, IBM Corporation
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* Copyright (C) 2005 Mike Wray, Hewlett-Packard
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* Copyright (C) 2005 XenSource Ltd
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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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/**
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* \file xenbusb_front.c
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*
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* XenBus management of the NewBus bus containing the frontend instances of
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* Xen split devices.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/sbuf.h>
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#include <sys/sysctl.h>
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#include <sys/syslog.h>
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#include <sys/systm.h>
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#include <sys/sx.h>
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#include <sys/taskqueue.h>
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#include <machine/stdarg.h>
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#include <xen/xen-os.h>
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#include <xen/gnttab.h>
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#include <xen/xenbus/xenbusvar.h>
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#include <xen/xenbus/xenbusb.h>
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/*------------------ Private Device Attachment Functions --------------------*/
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/**
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* \brief Probe for the existance of the XenBus front bus.
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*
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* \param dev NewBus device_t for this XenBus front bus instance.
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*
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* \return Always returns 0 indicating success.
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*/
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static int
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xenbusb_front_probe(device_t dev)
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{
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device_set_desc(dev, "Xen Frontend Devices");
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return (0);
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}
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/**
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* \brief Attach the XenBus front bus.
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*
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* \param dev NewBus device_t for this XenBus front bus instance.
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*
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* \return On success, 0. Otherwise an errno value indicating the
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* type of failure.
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*/
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static int
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xenbusb_front_attach(device_t dev)
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{
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return (xenbusb_attach(dev, "device", /*id_components*/1));
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}
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/**
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* \brief Enumerate all devices of the given type on this bus.
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*
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* \param dev NewBus device_t for this XenBus front bus instance.
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* \param type String indicating the device sub-tree (e.g. "vfb", "vif")
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* to enumerate.
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*
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* \return On success, 0. Otherwise an errno value indicating the
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* type of failure.
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*
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* Devices that are found are entered into the NewBus hierarchy via
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* xenbusb_add_device(). xenbusb_add_device() ignores duplicate detects
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* and ignores duplicate devices, so it can be called unconditionally
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* for any device found in the XenStore.
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*/
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static int
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xenbusb_front_enumerate_type(device_t dev, const char *type)
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{
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struct xenbusb_softc *xbs;
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const char **dir;
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unsigned int i, count;
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int error;
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xbs = device_get_softc(dev);
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error = xs_directory(XST_NIL, xbs->xbs_node, type, &count, &dir);
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if (error)
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return (error);
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for (i = 0; i < count; i++)
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xenbusb_add_device(dev, type, dir[i]);
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free(dir, M_XENSTORE);
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return (0);
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}
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/**
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* \brief Determine and store the XenStore path for the other end of
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* a split device whose local end is represented by ivars.
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*
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* If successful, the xd_otherend_path field of the child's instance
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* variables will be updated.
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*
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* \param dev NewBus device_t for this XenBus front bus instance.
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* \param ivars Instance variables from the XenBus child device for
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* which to perform this function.
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*
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* \return On success, 0. Otherwise an errno value indicating the
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* type of failure.
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*/
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static int
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xenbusb_front_get_otherend_node(device_t dev, struct xenbus_device_ivars *ivars)
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{
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char *otherend_path;
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int error;
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if (ivars->xd_otherend_path != NULL) {
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free(ivars->xd_otherend_path, M_XENBUS);
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ivars->xd_otherend_path = NULL;
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}
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error = xs_gather(XST_NIL, ivars->xd_node,
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"backend-id", "%i", &ivars->xd_otherend_id,
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"backend", NULL, &otherend_path,
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NULL);
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if (error == 0) {
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ivars->xd_otherend_path = strdup(otherend_path, M_XENBUS);
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ivars->xd_otherend_path_len = strlen(otherend_path);
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free(otherend_path, M_XENSTORE);
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}
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return (error);
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}
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/*-------------------- Private Device Attachment Data -----------------------*/
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static device_method_t xenbusb_front_methods[] = {
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/* Device interface */
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DEVMETHOD(device_identify, xenbusb_identify),
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DEVMETHOD(device_probe, xenbusb_front_probe),
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DEVMETHOD(device_attach, xenbusb_front_attach),
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DEVMETHOD(device_detach, bus_generic_detach),
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DEVMETHOD(device_shutdown, bus_generic_shutdown),
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DEVMETHOD(device_suspend, bus_generic_suspend),
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DEVMETHOD(device_resume, xenbusb_resume),
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/* Bus Interface */
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DEVMETHOD(bus_print_child, xenbusb_print_child),
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DEVMETHOD(bus_read_ivar, xenbusb_read_ivar),
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DEVMETHOD(bus_write_ivar, xenbusb_write_ivar),
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DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource),
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DEVMETHOD(bus_release_resource, bus_generic_release_resource),
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DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
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DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
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/* XenBus Bus Interface */
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DEVMETHOD(xenbusb_enumerate_type, xenbusb_front_enumerate_type),
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DEVMETHOD(xenbusb_get_otherend_node, xenbusb_front_get_otherend_node),
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{ 0, 0 }
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};
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DEFINE_CLASS_0(xenbusb_front, xenbusb_front_driver, xenbusb_front_methods,
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sizeof(struct xenbusb_softc));
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devclass_t xenbusb_front_devclass;
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DRIVER_MODULE(xenbusb_front, xenstore, xenbusb_front_driver,
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xenbusb_front_devclass, 0, 0);
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