diff options
Diffstat (limited to 'sys/xen/xenbus/xenbusb_front.c')
| -rw-r--r-- | sys/xen/xenbus/xenbusb_front.c | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/sys/xen/xenbus/xenbusb_front.c b/sys/xen/xenbus/xenbusb_front.c new file mode 100644 index 0000000..0bc06a4 --- /dev/null +++ b/sys/xen/xenbus/xenbusb_front.c @@ -0,0 +1,195 @@ +/****************************************************************************** + * Talks to Xen Store to figure out what devices we have. + * + * Copyright (C) 2009, 2010 Spectra Logic Corporation + * Copyright (C) 2008 Doug Rabson + * Copyright (C) 2005 Rusty Russell, IBM Corporation + * Copyright (C) 2005 Mike Wray, Hewlett-Packard + * Copyright (C) 2005 XenSource Ltd + * + * 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. + */ + +/** + * \file xenbusb_front.c + * + * XenBus management of the NewBus bus containing the frontend instances of + * Xen split devices. + */ +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/bus.h> +#include <sys/kernel.h> +#include <sys/lock.h> +#include <sys/malloc.h> +#include <sys/module.h> +#include <sys/sbuf.h> +#include <sys/sysctl.h> +#include <sys/syslog.h> +#include <sys/systm.h> +#include <sys/sx.h> +#include <sys/taskqueue.h> + +#include <machine/xen/xen-os.h> +#include <machine/stdarg.h> + +#include <xen/gnttab.h> +#include <xen/xenbus/xenbusvar.h> +#include <xen/xenbus/xenbusb.h> + + +/*------------------ Private Device Attachment Functions --------------------*/ +/** + * \brief Probe for the existance of the XenBus front bus. + * + * \param dev NewBus device_t for this XenBus front bus instance. + * + * \return Always returns 0 indicating success. + */ +static int +xenbusb_front_probe(device_t dev) +{ + device_set_desc(dev, "Xen Frontend Devices"); + + return (0); +} + +/** + * \brief Attach the XenBus front bus. + * + * \param dev NewBus device_t for this XenBus front bus instance. + * + * \return On success, 0. Otherwise an errno value indicating the + * type of failure. + */ +static int +xenbusb_front_attach(device_t dev) +{ + return (xenbusb_attach(dev, "device", /*id_components*/1)); +} + +/** + * \brief Enumerate all devices of the given type on this bus. + * + * \param dev NewBus device_t for this XenBus front bus instance. + * \param type String indicating the device sub-tree (e.g. "vfb", "vif") + * to enumerate. + * + * \return On success, 0. Otherwise an errno value indicating the + * type of failure. + * + * Devices that are found are entered into the NewBus hierarchy via + * xenbusb_add_device(). xenbusb_add_device() ignores duplicate detects + * and ignores duplicate devices, so it can be called unconditionally + * for any device found in the XenStore. + */ +static int +xenbusb_front_enumerate_type(device_t dev, const char *type) +{ + struct xenbusb_softc *xbs; + const char **dir; + unsigned int i, count; + int error; + + xbs = device_get_softc(dev); + error = xs_directory(XST_NIL, xbs->xbs_node, type, &count, &dir); + if (error) + return (error); + for (i = 0; i < count; i++) + xenbusb_add_device(dev, type, dir[i]); + + free(dir, M_XENSTORE); + + return (0); +} + +/** + * \brief Determine and store the XenStore path for the other end of + * a split device whose local end is represented by ivars. + * + * If successful, the xd_otherend_path field of the child's instance + * variables will be updated. + * + * \param dev NewBus device_t for this XenBus front bus instance. + * \param ivars Instance variables from the XenBus child device for + * which to perform this function. + * + * \return On success, 0. Otherwise an errno value indicating the + * type of failure. + */ +static int +xenbusb_front_get_otherend_node(device_t dev, struct xenbus_device_ivars *ivars) +{ + char *otherend_path; + int error; + + if (ivars->xd_otherend_path != NULL) { + free(ivars->xd_otherend_path, M_XENBUS); + ivars->xd_otherend_path = NULL; + } + + error = xs_gather(XST_NIL, ivars->xd_node, + "backend-id", "%i", &ivars->xd_otherend_id, + "backend", NULL, &otherend_path, + NULL); + + if (error == 0) { + ivars->xd_otherend_path = strdup(otherend_path, M_XENBUS); + free(otherend_path, M_XENSTORE); + } + return (error); +} + +/*-------------------- Private Device Attachment Data -----------------------*/ +static device_method_t xenbusb_front_methods[] = { + /* Device interface */ + DEVMETHOD(device_identify, xenbusb_identify), + DEVMETHOD(device_probe, xenbusb_front_probe), + DEVMETHOD(device_attach, xenbusb_front_attach), + DEVMETHOD(device_detach, bus_generic_detach), + DEVMETHOD(device_shutdown, bus_generic_shutdown), + DEVMETHOD(device_suspend, bus_generic_suspend), + DEVMETHOD(device_resume, bus_generic_resume), + + /* Bus Interface */ + DEVMETHOD(bus_print_child, xenbusb_print_child), + DEVMETHOD(bus_read_ivar, xenbusb_read_ivar), + DEVMETHOD(bus_write_ivar, xenbusb_write_ivar), + DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource), + DEVMETHOD(bus_release_resource, bus_generic_release_resource), + DEVMETHOD(bus_activate_resource, bus_generic_activate_resource), + DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource), + + /* XenBus Bus Interface */ + DEVMETHOD(xenbusb_enumerate_type, xenbusb_front_enumerate_type), + DEVMETHOD(xenbusb_get_otherend_node, xenbusb_front_get_otherend_node), + { 0, 0 } +}; + +DEFINE_CLASS_0(xenbusb_front, xenbusb_front_driver, xenbusb_front_methods, + sizeof(struct xenbusb_softc)); +devclass_t xenbusb_front_devclass; + +DRIVER_MODULE(xenbusb_front, xenstore, xenbusb_front_driver, + xenbusb_front_devclass, 0, 0); |
