freebsd-skq/sys/x86/xen/xenpv.c
royger e09f127692 xen: convert the Grant-table code to a NewBus device
This allows the Grant-table code to attach directly to the xenpv bus,
allowing us to remove the grant-table initialization done in xenpv.

Sponsored by: Citrix Systems R&D
2014-12-10 11:35:41 +00:00

113 lines
3.2 KiB
C

/*
* Copyright (c) 2014 Roger Pau Monné <roger.pau@citrix.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/pcpu.h>
#include <sys/smp.h>
#include <xen/xen-os.h>
#include <xen/gnttab.h>
static devclass_t xenpv_devclass;
static void
xenpv_identify(driver_t *driver, device_t parent)
{
if (!xen_domain())
return;
/* Make sure there's only one xenpv device. */
if (devclass_get_device(xenpv_devclass, 0))
return;
if (BUS_ADD_CHILD(parent, 0, "xenpv", 0) == NULL)
panic("Unable to attach xenpv bus.");
}
static int
xenpv_probe(device_t dev)
{
device_set_desc(dev, "Xen PV bus");
return (BUS_PROBE_NOWILDCARD);
}
static int
xenpv_attach(device_t dev)
{
device_t child;
/*
* Let our child drivers identify any child devices that they
* can find. Once that is done attach any devices that we
* found.
*/
bus_generic_probe(dev);
bus_generic_attach(dev);
if (!devclass_get_device(devclass_find("isa"), 0)) {
child = BUS_ADD_CHILD(dev, 0, "isa", 0);
if (child == NULL)
panic("Failed to attach ISA bus.");
device_probe_and_attach(child);
}
return (0);
}
static device_method_t xenpv_methods[] = {
/* Device interface */
DEVMETHOD(device_identify, xenpv_identify),
DEVMETHOD(device_probe, xenpv_probe),
DEVMETHOD(device_attach, xenpv_attach),
DEVMETHOD(device_suspend, bus_generic_suspend),
DEVMETHOD(device_resume, bus_generic_resume),
/* Bus interface */
DEVMETHOD(bus_add_child, bus_generic_add_child),
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),
DEVMETHOD_END
};
static driver_t xenpv_driver = {
"xenpv",
xenpv_methods,
0,
};
DRIVER_MODULE(xenpv, nexus, xenpv_driver, xenpv_devclass, 0, 0);