2014-06-16 08:54:04 +00:00
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/*
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* Copyright (c) 2014 Roger Pau Monné <roger.pau@citrix.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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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/systm.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/pcpu.h>
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2015-05-08 14:48:40 +00:00
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#include <sys/rman.h>
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2014-06-16 08:54:04 +00:00
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#include <sys/smp.h>
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2015-05-25 09:47:16 +00:00
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#include <sys/limits.h>
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2017-04-17 17:07:00 +00:00
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#include <sys/vmmeter.h>
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2014-06-16 08:54:04 +00:00
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2015-05-08 14:48:40 +00:00
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#include <vm/vm.h>
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#include <vm/vm_page.h>
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#include <vm/vm_param.h>
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#include <vm/vm_phys.h>
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2014-06-16 08:54:04 +00:00
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#include <xen/xen-os.h>
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#include <xen/gnttab.h>
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2015-05-08 14:48:40 +00:00
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#include "xenmem_if.h"
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/*
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* Allocate unused physical memory above 4GB in order to map memory
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* from foreign domains. We use memory starting at 4GB in order to
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* prevent clashes with MMIO/ACPI regions.
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*
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* Since this is not possible on i386 just use any available memory
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* chunk and hope we don't clash with anything else.
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*/
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#ifdef __amd64__
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#define LOW_MEM_LIMIT 0x100000000ul
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#else
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#define LOW_MEM_LIMIT 0
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#endif
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2014-06-16 08:54:04 +00:00
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static devclass_t xenpv_devclass;
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static void
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xenpv_identify(driver_t *driver, device_t parent)
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{
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if (!xen_domain())
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return;
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/* Make sure there's only one xenpv device. */
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if (devclass_get_device(xenpv_devclass, 0))
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return;
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2015-05-25 09:47:16 +00:00
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/*
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* The xenpv bus should be the last to attach in order
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* to properly detect if an ISA bus has already been added.
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*/
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if (BUS_ADD_CHILD(parent, UINT_MAX, "xenpv", 0) == NULL)
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2014-06-16 08:54:04 +00:00
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panic("Unable to attach xenpv bus.");
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}
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static int
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xenpv_probe(device_t dev)
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{
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device_set_desc(dev, "Xen PV bus");
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return (BUS_PROBE_NOWILDCARD);
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}
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static int
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xenpv_attach(device_t dev)
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{
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2018-02-16 18:04:27 +00:00
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int error;
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2014-06-16 08:54:04 +00:00
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/*
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* Let our child drivers identify any child devices that they
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* can find. Once that is done attach any devices that we
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* found.
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*/
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2018-02-16 18:04:27 +00:00
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error = bus_generic_probe(dev);
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if (error)
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return (error);
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2014-06-16 08:54:04 +00:00
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2018-02-16 18:04:27 +00:00
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error = bus_generic_attach(dev);
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2014-06-16 08:54:04 +00:00
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2018-02-16 18:04:27 +00:00
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return (error);
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2014-06-16 08:54:04 +00:00
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}
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2015-05-08 14:48:40 +00:00
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static struct resource *
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xenpv_alloc_physmem(device_t dev, device_t child, int *res_id, size_t size)
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{
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struct resource *res;
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vm_paddr_t phys_addr;
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int error;
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res = bus_alloc_resource(child, SYS_RES_MEMORY, res_id, LOW_MEM_LIMIT,
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2016-03-03 05:07:35 +00:00
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~0, size, RF_ACTIVE);
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2015-05-08 14:48:40 +00:00
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if (res == NULL)
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return (NULL);
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phys_addr = rman_get_start(res);
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error = vm_phys_fictitious_reg_range(phys_addr, phys_addr + size,
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VM_MEMATTR_DEFAULT);
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if (error) {
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bus_release_resource(child, SYS_RES_MEMORY, *res_id, res);
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return (NULL);
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}
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return (res);
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}
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static int
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xenpv_free_physmem(device_t dev, device_t child, int res_id, struct resource *res)
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{
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vm_paddr_t phys_addr;
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size_t size;
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phys_addr = rman_get_start(res);
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size = rman_get_size(res);
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vm_phys_fictitious_unreg_range(phys_addr, phys_addr + size);
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return (bus_release_resource(child, SYS_RES_MEMORY, res_id, res));
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}
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2014-06-16 08:54:04 +00:00
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static device_method_t xenpv_methods[] = {
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/* Device interface */
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DEVMETHOD(device_identify, xenpv_identify),
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DEVMETHOD(device_probe, xenpv_probe),
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DEVMETHOD(device_attach, xenpv_attach),
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DEVMETHOD(device_suspend, bus_generic_suspend),
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DEVMETHOD(device_resume, bus_generic_resume),
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/* Bus interface */
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DEVMETHOD(bus_add_child, bus_generic_add_child),
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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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2015-05-08 14:48:40 +00:00
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/* Interface to allocate memory for foreign mappings */
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DEVMETHOD(xenmem_alloc, xenpv_alloc_physmem),
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DEVMETHOD(xenmem_free, xenpv_free_physmem),
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2014-06-16 08:54:04 +00:00
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DEVMETHOD_END
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};
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static driver_t xenpv_driver = {
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"xenpv",
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xenpv_methods,
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0,
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};
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DRIVER_MODULE(xenpv, nexus, xenpv_driver, xenpv_devclass, 0, 0);
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2015-05-08 14:48:40 +00:00
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struct resource *
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xenmem_alloc(device_t dev, int *res_id, size_t size)
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{
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device_t parent;
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parent = device_get_parent(dev);
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if (parent == NULL)
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return (NULL);
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return (XENMEM_ALLOC(parent, dev, res_id, size));
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}
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int
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xenmem_free(device_t dev, int res_id, struct resource *res)
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{
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device_t parent;
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parent = device_get_parent(dev);
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if (parent == NULL)
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return (ENXIO);
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return (XENMEM_FREE(parent, dev, res_id, res));
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}
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