1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2011 NetApp, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/param.h> 35 #include <sys/bus.h> 36 #include <sys/eventhandler.h> 37 #include <sys/sysctl.h> 38 #include <sys/systm.h> 39 40 #include <dev/pci/pcivar.h> 41 #include <dev/pci/pcireg.h> 42 43 #include <machine/cpu.h> 44 #include <machine/md_var.h> 45 46 #include "vmm_util.h" 47 #include "vmm_mem.h" 48 #include "iommu.h" 49 50 SYSCTL_DECL(_hw_vmm); 51 SYSCTL_NODE(_hw_vmm, OID_AUTO, iommu, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 52 "bhyve iommu parameters"); 53 54 static int iommu_avail; 55 SYSCTL_INT(_hw_vmm_iommu, OID_AUTO, initialized, CTLFLAG_RD, &iommu_avail, 56 0, "bhyve iommu initialized?"); 57 58 static int iommu_enable = 1; 59 SYSCTL_INT(_hw_vmm_iommu, OID_AUTO, enable, CTLFLAG_RDTUN, &iommu_enable, 0, 60 "Enable use of I/O MMU (required for PCI passthrough)."); 61 62 static struct iommu_ops *ops; 63 static void *host_domain; 64 static eventhandler_tag add_tag, delete_tag; 65 66 static __inline int 67 IOMMU_INIT(void) 68 { 69 if (ops != NULL) 70 return ((*ops->init)()); 71 else 72 return (ENXIO); 73 } 74 75 static __inline void 76 IOMMU_CLEANUP(void) 77 { 78 if (ops != NULL && iommu_avail) 79 (*ops->cleanup)(); 80 } 81 82 static __inline void * 83 IOMMU_CREATE_DOMAIN(vm_paddr_t maxaddr) 84 { 85 86 if (ops != NULL && iommu_avail) 87 return ((*ops->create_domain)(maxaddr)); 88 else 89 return (NULL); 90 } 91 92 static __inline void 93 IOMMU_DESTROY_DOMAIN(void *dom) 94 { 95 96 if (ops != NULL && iommu_avail) 97 (*ops->destroy_domain)(dom); 98 } 99 100 static __inline uint64_t 101 IOMMU_CREATE_MAPPING(void *domain, vm_paddr_t gpa, vm_paddr_t hpa, uint64_t len) 102 { 103 104 if (ops != NULL && iommu_avail) 105 return ((*ops->create_mapping)(domain, gpa, hpa, len)); 106 else 107 return (len); /* XXX */ 108 } 109 110 static __inline uint64_t 111 IOMMU_REMOVE_MAPPING(void *domain, vm_paddr_t gpa, uint64_t len) 112 { 113 114 if (ops != NULL && iommu_avail) 115 return ((*ops->remove_mapping)(domain, gpa, len)); 116 else 117 return (len); /* XXX */ 118 } 119 120 static __inline void 121 IOMMU_ADD_DEVICE(void *domain, uint16_t rid) 122 { 123 124 if (ops != NULL && iommu_avail) 125 (*ops->add_device)(domain, rid); 126 } 127 128 static __inline void 129 IOMMU_REMOVE_DEVICE(void *domain, uint16_t rid) 130 { 131 132 if (ops != NULL && iommu_avail) 133 (*ops->remove_device)(domain, rid); 134 } 135 136 static __inline void 137 IOMMU_INVALIDATE_TLB(void *domain) 138 { 139 140 if (ops != NULL && iommu_avail) 141 (*ops->invalidate_tlb)(domain); 142 } 143 144 static __inline void 145 IOMMU_ENABLE(void) 146 { 147 148 if (ops != NULL && iommu_avail) 149 (*ops->enable)(); 150 } 151 152 static __inline void 153 IOMMU_DISABLE(void) 154 { 155 156 if (ops != NULL && iommu_avail) 157 (*ops->disable)(); 158 } 159 160 static void 161 iommu_pci_add(void *arg, device_t dev) 162 { 163 164 /* Add new devices to the host domain. */ 165 iommu_add_device(host_domain, pci_get_rid(dev)); 166 } 167 168 static void 169 iommu_pci_delete(void *arg, device_t dev) 170 { 171 172 iommu_remove_device(host_domain, pci_get_rid(dev)); 173 } 174 175 static void 176 iommu_init(void) 177 { 178 int error, bus, slot, func; 179 vm_paddr_t maxaddr; 180 devclass_t dc; 181 device_t dev; 182 183 if (!iommu_enable) 184 return; 185 186 if (vmm_is_intel()) 187 ops = &iommu_ops_intel; 188 else if (vmm_is_svm()) 189 ops = &iommu_ops_amd; 190 else 191 ops = NULL; 192 193 error = IOMMU_INIT(); 194 if (error) 195 return; 196 197 iommu_avail = 1; 198 199 /* 200 * Create a domain for the devices owned by the host 201 */ 202 maxaddr = vmm_mem_maxaddr(); 203 host_domain = IOMMU_CREATE_DOMAIN(maxaddr); 204 if (host_domain == NULL) { 205 printf("iommu_init: unable to create a host domain"); 206 IOMMU_CLEANUP(); 207 ops = NULL; 208 iommu_avail = 0; 209 return; 210 } 211 212 /* 213 * Create 1:1 mappings from '0' to 'maxaddr' for devices assigned to 214 * the host 215 */ 216 iommu_create_mapping(host_domain, 0, 0, maxaddr); 217 218 add_tag = EVENTHANDLER_REGISTER(pci_add_device, iommu_pci_add, NULL, 0); 219 delete_tag = EVENTHANDLER_REGISTER(pci_delete_device, iommu_pci_delete, 220 NULL, 0); 221 dc = devclass_find("ppt"); 222 for (bus = 0; bus <= PCI_BUSMAX; bus++) { 223 for (slot = 0; slot <= PCI_SLOTMAX; slot++) { 224 for (func = 0; func <= PCI_FUNCMAX; func++) { 225 dev = pci_find_dbsf(0, bus, slot, func); 226 if (dev == NULL) 227 continue; 228 229 /* Skip passthrough devices. */ 230 if (dc != NULL && 231 device_get_devclass(dev) == dc) 232 continue; 233 234 /* 235 * Everything else belongs to the host 236 * domain. 237 */ 238 iommu_add_device(host_domain, 239 pci_get_rid(dev)); 240 } 241 } 242 } 243 IOMMU_ENABLE(); 244 245 } 246 247 void 248 iommu_cleanup(void) 249 { 250 251 if (add_tag != NULL) { 252 EVENTHANDLER_DEREGISTER(pci_add_device, add_tag); 253 add_tag = NULL; 254 } 255 if (delete_tag != NULL) { 256 EVENTHANDLER_DEREGISTER(pci_delete_device, delete_tag); 257 delete_tag = NULL; 258 } 259 IOMMU_DISABLE(); 260 IOMMU_DESTROY_DOMAIN(host_domain); 261 IOMMU_CLEANUP(); 262 } 263 264 void * 265 iommu_create_domain(vm_paddr_t maxaddr) 266 { 267 static volatile int iommu_initted; 268 269 if (iommu_initted < 2) { 270 if (atomic_cmpset_int(&iommu_initted, 0, 1)) { 271 iommu_init(); 272 atomic_store_rel_int(&iommu_initted, 2); 273 } else 274 while (iommu_initted == 1) 275 cpu_spinwait(); 276 } 277 return (IOMMU_CREATE_DOMAIN(maxaddr)); 278 } 279 280 void 281 iommu_destroy_domain(void *dom) 282 { 283 284 IOMMU_DESTROY_DOMAIN(dom); 285 } 286 287 void 288 iommu_create_mapping(void *dom, vm_paddr_t gpa, vm_paddr_t hpa, size_t len) 289 { 290 uint64_t mapped, remaining; 291 292 remaining = len; 293 294 while (remaining > 0) { 295 mapped = IOMMU_CREATE_MAPPING(dom, gpa, hpa, remaining); 296 gpa += mapped; 297 hpa += mapped; 298 remaining -= mapped; 299 } 300 } 301 302 void 303 iommu_remove_mapping(void *dom, vm_paddr_t gpa, size_t len) 304 { 305 uint64_t unmapped, remaining; 306 307 remaining = len; 308 309 while (remaining > 0) { 310 unmapped = IOMMU_REMOVE_MAPPING(dom, gpa, remaining); 311 gpa += unmapped; 312 remaining -= unmapped; 313 } 314 } 315 316 void * 317 iommu_host_domain(void) 318 { 319 320 return (host_domain); 321 } 322 323 void 324 iommu_add_device(void *dom, uint16_t rid) 325 { 326 327 IOMMU_ADD_DEVICE(dom, rid); 328 } 329 330 void 331 iommu_remove_device(void *dom, uint16_t rid) 332 { 333 334 IOMMU_REMOVE_DEVICE(dom, rid); 335 } 336 337 void 338 iommu_invalidate_tlb(void *domain) 339 { 340 341 IOMMU_INVALIDATE_TLB(domain); 342 } 343