1/* 2 * Copyright (c) 2014 Roger Pau Monn�� <roger.pau@citrix.com> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: releng/11.0/sys/x86/xen/xenpv.c 296336 2016-03-03 05:07:35Z jhibbits $"); 29 30#include <sys/param.h> 31#include <sys/systm.h> 32#include <sys/bus.h> 33#include <sys/kernel.h> 34#include <sys/module.h> 35#include <sys/pcpu.h> 36#include <sys/rman.h> 37#include <sys/smp.h> 38#include <sys/limits.h> 39 40#include <vm/vm.h> 41#include <vm/vm_page.h> 42#include <vm/vm_param.h> 43#include <vm/vm_phys.h> 44 45#include <xen/xen-os.h> 46#include <xen/gnttab.h> 47 48#include "xenmem_if.h" 49 50/* 51 * Allocate unused physical memory above 4GB in order to map memory 52 * from foreign domains. We use memory starting at 4GB in order to 53 * prevent clashes with MMIO/ACPI regions. 54 * 55 * Since this is not possible on i386 just use any available memory 56 * chunk and hope we don't clash with anything else. 57 */ 58#ifdef __amd64__ 59#define LOW_MEM_LIMIT 0x100000000ul 60#else 61#define LOW_MEM_LIMIT 0 62#endif 63 64static devclass_t xenpv_devclass; 65 66static void 67xenpv_identify(driver_t *driver, device_t parent) 68{ 69 if (!xen_domain()) 70 return; 71 72 /* Make sure there's only one xenpv device. */ 73 if (devclass_get_device(xenpv_devclass, 0)) 74 return; 75 76 /* 77 * The xenpv bus should be the last to attach in order 78 * to properly detect if an ISA bus has already been added. 79 */ 80 if (BUS_ADD_CHILD(parent, UINT_MAX, "xenpv", 0) == NULL) 81 panic("Unable to attach xenpv bus."); 82} 83 84static int 85xenpv_probe(device_t dev) 86{ 87 88 device_set_desc(dev, "Xen PV bus"); 89 return (BUS_PROBE_NOWILDCARD); 90} 91 92static int 93xenpv_attach(device_t dev) 94{ 95 device_t child; 96 97 /* 98 * Let our child drivers identify any child devices that they 99 * can find. Once that is done attach any devices that we 100 * found. 101 */ 102 bus_generic_probe(dev); 103 bus_generic_attach(dev); 104 105 if (!devclass_get_device(devclass_find("isa"), 0)) { 106 child = BUS_ADD_CHILD(dev, 0, "isa", 0); 107 if (child == NULL) 108 panic("Failed to attach ISA bus."); 109 device_probe_and_attach(child); 110 } 111 112 return (0); 113} 114 115static struct resource * 116xenpv_alloc_physmem(device_t dev, device_t child, int *res_id, size_t size) 117{ 118 struct resource *res; 119 vm_paddr_t phys_addr; 120 int error; 121 122 res = bus_alloc_resource(child, SYS_RES_MEMORY, res_id, LOW_MEM_LIMIT, 123 ~0, size, RF_ACTIVE); 124 if (res == NULL) 125 return (NULL); 126 127 phys_addr = rman_get_start(res); 128 error = vm_phys_fictitious_reg_range(phys_addr, phys_addr + size, 129 VM_MEMATTR_DEFAULT); 130 if (error) { 131 bus_release_resource(child, SYS_RES_MEMORY, *res_id, res); 132 return (NULL); 133 } 134 135 return (res); 136} 137 138static int 139xenpv_free_physmem(device_t dev, device_t child, int res_id, struct resource *res) 140{ 141 vm_paddr_t phys_addr; 142 size_t size; 143 144 phys_addr = rman_get_start(res); 145 size = rman_get_size(res); 146 147 vm_phys_fictitious_unreg_range(phys_addr, phys_addr + size); 148 return (bus_release_resource(child, SYS_RES_MEMORY, res_id, res)); 149} 150 151static device_method_t xenpv_methods[] = { 152 /* Device interface */ 153 DEVMETHOD(device_identify, xenpv_identify), 154 DEVMETHOD(device_probe, xenpv_probe), 155 DEVMETHOD(device_attach, xenpv_attach), 156 DEVMETHOD(device_suspend, bus_generic_suspend), 157 DEVMETHOD(device_resume, bus_generic_resume), 158 159 /* Bus interface */ 160 DEVMETHOD(bus_add_child, bus_generic_add_child), 161 DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource), 162 DEVMETHOD(bus_release_resource, bus_generic_release_resource), 163 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource), 164 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource), 165 166 /* Interface to allocate memory for foreign mappings */ 167 DEVMETHOD(xenmem_alloc, xenpv_alloc_physmem), 168 DEVMETHOD(xenmem_free, xenpv_free_physmem), 169 170 DEVMETHOD_END 171}; 172 173static driver_t xenpv_driver = { 174 "xenpv", 175 xenpv_methods, 176 0, 177}; 178 179DRIVER_MODULE(xenpv, nexus, xenpv_driver, xenpv_devclass, 0, 0); 180 181struct resource * 182xenmem_alloc(device_t dev, int *res_id, size_t size) 183{ 184 device_t parent; 185 186 parent = device_get_parent(dev); 187 if (parent == NULL) 188 return (NULL); 189 return (XENMEM_ALLOC(parent, dev, res_id, size)); 190} 191 192int 193xenmem_free(device_t dev, int res_id, struct resource *res) 194{ 195 device_t parent; 196 197 parent = device_get_parent(dev); 198 if (parent == NULL) 199 return (ENXIO); 200 return (XENMEM_FREE(parent, dev, res_id, res)); 201} 202