iommu.c revision 267070
1/*- 2 * Copyright (c) 2011 NetApp, Inc. 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 NETAPP, INC ``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 NETAPP, INC 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 * $FreeBSD: stable/10/sys/amd64/vmm/io/iommu.c 267070 2014-06-04 17:57:48Z jhb $ 27 */ 28 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD: stable/10/sys/amd64/vmm/io/iommu.c 267070 2014-06-04 17:57:48Z jhb $"); 31 32#include <sys/param.h> 33#include <sys/types.h> 34#include <sys/systm.h> 35#include <sys/bus.h> 36#include <sys/sysctl.h> 37 38#include <dev/pci/pcivar.h> 39#include <dev/pci/pcireg.h> 40 41#include <machine/md_var.h> 42 43#include "vmm_util.h" 44#include "vmm_mem.h" 45#include "iommu.h" 46 47SYSCTL_DECL(_hw_vmm); 48SYSCTL_NODE(_hw_vmm, OID_AUTO, iommu, CTLFLAG_RW, 0, "bhyve iommu parameters"); 49 50static int iommu_avail; 51SYSCTL_INT(_hw_vmm_iommu, OID_AUTO, initialized, CTLFLAG_RD, &iommu_avail, 52 0, "bhyve iommu initialized?"); 53 54static struct iommu_ops *ops; 55static void *host_domain; 56 57static __inline int 58IOMMU_INIT(void) 59{ 60 if (ops != NULL) 61 return ((*ops->init)()); 62 else 63 return (ENXIO); 64} 65 66static __inline void 67IOMMU_CLEANUP(void) 68{ 69 if (ops != NULL && iommu_avail) 70 (*ops->cleanup)(); 71} 72 73static __inline void * 74IOMMU_CREATE_DOMAIN(vm_paddr_t maxaddr) 75{ 76 77 if (ops != NULL && iommu_avail) 78 return ((*ops->create_domain)(maxaddr)); 79 else 80 return (NULL); 81} 82 83static __inline void 84IOMMU_DESTROY_DOMAIN(void *dom) 85{ 86 87 if (ops != NULL && iommu_avail) 88 (*ops->destroy_domain)(dom); 89} 90 91static __inline uint64_t 92IOMMU_CREATE_MAPPING(void *domain, vm_paddr_t gpa, vm_paddr_t hpa, uint64_t len) 93{ 94 95 if (ops != NULL && iommu_avail) 96 return ((*ops->create_mapping)(domain, gpa, hpa, len)); 97 else 98 return (len); /* XXX */ 99} 100 101static __inline uint64_t 102IOMMU_REMOVE_MAPPING(void *domain, vm_paddr_t gpa, uint64_t len) 103{ 104 105 if (ops != NULL && iommu_avail) 106 return ((*ops->remove_mapping)(domain, gpa, len)); 107 else 108 return (len); /* XXX */ 109} 110 111static __inline void 112IOMMU_ADD_DEVICE(void *domain, int bus, int slot, int func) 113{ 114 115 if (ops != NULL && iommu_avail) 116 (*ops->add_device)(domain, bus, slot, func); 117} 118 119static __inline void 120IOMMU_REMOVE_DEVICE(void *domain, int bus, int slot, int func) 121{ 122 123 if (ops != NULL && iommu_avail) 124 (*ops->remove_device)(domain, bus, slot, func); 125} 126 127static __inline void 128IOMMU_INVALIDATE_TLB(void *domain) 129{ 130 131 if (ops != NULL && iommu_avail) 132 (*ops->invalidate_tlb)(domain); 133} 134 135static __inline void 136IOMMU_ENABLE(void) 137{ 138 139 if (ops != NULL && iommu_avail) 140 (*ops->enable)(); 141} 142 143static __inline void 144IOMMU_DISABLE(void) 145{ 146 147 if (ops != NULL && iommu_avail) 148 (*ops->disable)(); 149} 150 151void 152iommu_init(void) 153{ 154 int error, bus, slot, func; 155 vm_paddr_t maxaddr; 156 const char *name; 157 device_t dev; 158 159 if (vmm_is_intel()) 160 ops = &iommu_ops_intel; 161 else if (vmm_is_amd()) 162 ops = &iommu_ops_amd; 163 else 164 ops = NULL; 165 166 error = IOMMU_INIT(); 167 if (error) 168 return; 169 170 iommu_avail = 1; 171 172 /* 173 * Create a domain for the devices owned by the host 174 */ 175 maxaddr = vmm_mem_maxaddr(); 176 host_domain = IOMMU_CREATE_DOMAIN(maxaddr); 177 if (host_domain == NULL) 178 panic("iommu_init: unable to create a host domain"); 179 180 /* 181 * Create 1:1 mappings from '0' to 'maxaddr' for devices assigned to 182 * the host 183 */ 184 iommu_create_mapping(host_domain, 0, 0, maxaddr); 185 186 for (bus = 0; bus <= PCI_BUSMAX; bus++) { 187 for (slot = 0; slot <= PCI_SLOTMAX; slot++) { 188 for (func = 0; func <= PCI_FUNCMAX; func++) { 189 dev = pci_find_dbsf(0, bus, slot, func); 190 if (dev == NULL) 191 continue; 192 193 /* skip passthrough devices */ 194 name = device_get_name(dev); 195 if (name != NULL && strcmp(name, "ppt") == 0) 196 continue; 197 198 /* everything else belongs to the host domain */ 199 iommu_add_device(host_domain, bus, slot, func); 200 } 201 } 202 } 203 IOMMU_ENABLE(); 204 205} 206 207void 208iommu_cleanup(void) 209{ 210 IOMMU_DISABLE(); 211 IOMMU_DESTROY_DOMAIN(host_domain); 212 IOMMU_CLEANUP(); 213} 214 215void * 216iommu_create_domain(vm_paddr_t maxaddr) 217{ 218 219 return (IOMMU_CREATE_DOMAIN(maxaddr)); 220} 221 222void 223iommu_destroy_domain(void *dom) 224{ 225 226 IOMMU_DESTROY_DOMAIN(dom); 227} 228 229void 230iommu_create_mapping(void *dom, vm_paddr_t gpa, vm_paddr_t hpa, size_t len) 231{ 232 uint64_t mapped, remaining; 233 234 remaining = len; 235 236 while (remaining > 0) { 237 mapped = IOMMU_CREATE_MAPPING(dom, gpa, hpa, remaining); 238 gpa += mapped; 239 hpa += mapped; 240 remaining -= mapped; 241 } 242} 243 244void 245iommu_remove_mapping(void *dom, vm_paddr_t gpa, size_t len) 246{ 247 uint64_t unmapped, remaining; 248 249 remaining = len; 250 251 while (remaining > 0) { 252 unmapped = IOMMU_REMOVE_MAPPING(dom, gpa, remaining); 253 gpa += unmapped; 254 remaining -= unmapped; 255 } 256} 257 258void * 259iommu_host_domain(void) 260{ 261 262 return (host_domain); 263} 264 265void 266iommu_add_device(void *dom, int bus, int slot, int func) 267{ 268 269 IOMMU_ADD_DEVICE(dom, bus, slot, func); 270} 271 272void 273iommu_remove_device(void *dom, int bus, int slot, int func) 274{ 275 276 IOMMU_REMOVE_DEVICE(dom, bus, slot, func); 277} 278 279void 280iommu_invalidate_tlb(void *domain) 281{ 282 283 IOMMU_INVALIDATE_TLB(domain); 284} 285