1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2011, Bryan Venteicher <bryanv@FreeBSD.org> 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 unmodified, this list of conditions, and the following 12 * disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/kernel.h> 35 #include <sys/malloc.h> 36 #include <sys/module.h> 37 #include <sys/sbuf.h> 38 39 #include <machine/bus.h> 40 #include <machine/resource.h> 41 #include <sys/bus.h> 42 #include <sys/rman.h> 43 44 #include <dev/virtio/virtio.h> 45 #include <dev/virtio/virtio_config.h> 46 #include <dev/virtio/virtqueue.h> 47 48 #include "virtio_bus_if.h" 49 50 static int virtio_modevent(module_t, int, void *); 51 static const char *virtio_feature_name(uint64_t, struct virtio_feature_desc *); 52 53 static struct virtio_ident { 54 uint16_t devid; 55 const char *name; 56 } virtio_ident_table[] = { 57 { VIRTIO_ID_NETWORK, "Network" }, 58 { VIRTIO_ID_BLOCK, "Block" }, 59 { VIRTIO_ID_CONSOLE, "Console" }, 60 { VIRTIO_ID_ENTROPY, "Entropy" }, 61 { VIRTIO_ID_BALLOON, "Balloon" }, 62 { VIRTIO_ID_IOMEMORY, "IOMemory" }, 63 { VIRTIO_ID_RPMSG, "Remote Processor Messaging" }, 64 { VIRTIO_ID_SCSI, "SCSI" }, 65 { VIRTIO_ID_9P, "9P Transport" }, 66 { VIRTIO_ID_RPROC_SERIAL, "Remote Processor Serial" }, 67 { VIRTIO_ID_CAIF, "CAIF" }, 68 { VIRTIO_ID_GPU, "GPU" }, 69 { VIRTIO_ID_INPUT, "Input" }, 70 { VIRTIO_ID_VSOCK, "VSOCK Transport" }, 71 { VIRTIO_ID_CRYPTO, "Crypto" }, 72 73 { 0, NULL } 74 }; 75 76 /* Device independent features. */ 77 static struct virtio_feature_desc virtio_common_feature_desc[] = { 78 { VIRTIO_F_NOTIFY_ON_EMPTY, "NotifyOnEmpty" }, /* Legacy */ 79 { VIRTIO_F_ANY_LAYOUT, "AnyLayout" }, /* Legacy */ 80 { VIRTIO_RING_F_INDIRECT_DESC, "RingIndirectDesc" }, 81 { VIRTIO_RING_F_EVENT_IDX, "RingEventIdx" }, 82 { VIRTIO_F_BAD_FEATURE, "BadFeature" }, /* Legacy */ 83 { VIRTIO_F_VERSION_1, "Version1" }, 84 { VIRTIO_F_IOMMU_PLATFORM, "IOMMUPlatform" }, 85 86 { 0, NULL } 87 }; 88 89 const char * 90 virtio_device_name(uint16_t devid) 91 { 92 struct virtio_ident *ident; 93 94 for (ident = virtio_ident_table; ident->name != NULL; ident++) { 95 if (ident->devid == devid) 96 return (ident->name); 97 } 98 99 return (NULL); 100 } 101 102 static const char * 103 virtio_feature_name(uint64_t val, struct virtio_feature_desc *desc) 104 { 105 int i, j; 106 struct virtio_feature_desc *descs[2] = { desc, 107 virtio_common_feature_desc }; 108 109 for (i = 0; i < 2; i++) { 110 if (descs[i] == NULL) 111 continue; 112 113 for (j = 0; descs[i][j].vfd_val != 0; j++) { 114 if (val == descs[i][j].vfd_val) 115 return (descs[i][j].vfd_str); 116 } 117 } 118 119 return (NULL); 120 } 121 122 int 123 virtio_describe_sbuf(struct sbuf *sb, uint64_t features, 124 struct virtio_feature_desc *desc) 125 { 126 const char *name; 127 uint64_t val; 128 int n; 129 130 sbuf_printf(sb, "%#jx", (uintmax_t) features); 131 132 for (n = 0, val = 1ULL << 63; val != 0; val >>= 1) { 133 /* 134 * BAD_FEATURE is used to detect broken Linux clients 135 * and therefore is not applicable to FreeBSD. 136 */ 137 if (((features & val) == 0) || val == VIRTIO_F_BAD_FEATURE) 138 continue; 139 140 if (n++ == 0) 141 sbuf_cat(sb, " <"); 142 else 143 sbuf_cat(sb, ","); 144 145 name = virtio_feature_name(val, desc); 146 if (name == NULL) 147 sbuf_printf(sb, "%#jx", (uintmax_t) val); 148 else 149 sbuf_cat(sb, name); 150 } 151 152 if (n > 0) 153 sbuf_cat(sb, ">"); 154 155 return (sbuf_finish(sb)); 156 } 157 158 void 159 virtio_describe(device_t dev, const char *msg, uint64_t features, 160 struct virtio_feature_desc *desc) 161 { 162 struct sbuf sb; 163 char *buf; 164 int error; 165 166 if ((buf = malloc(1024, M_TEMP, M_NOWAIT)) == NULL) { 167 error = ENOMEM; 168 goto out; 169 } 170 171 sbuf_new(&sb, buf, 1024, SBUF_FIXEDLEN); 172 sbuf_printf(&sb, "%s features: ", msg); 173 174 error = virtio_describe_sbuf(&sb, features, desc); 175 if (error == 0) 176 device_printf(dev, "%s\n", sbuf_data(&sb)); 177 178 sbuf_delete(&sb); 179 free(buf, M_TEMP); 180 181 out: 182 if (error != 0) { 183 device_printf(dev, "%s features: %#jx\n", msg, 184 (uintmax_t) features); 185 } 186 } 187 188 uint64_t 189 virtio_filter_transport_features(uint64_t features) 190 { 191 uint64_t transport, mask; 192 193 transport = (1ULL << 194 (VIRTIO_TRANSPORT_F_END - VIRTIO_TRANSPORT_F_START)) - 1; 195 transport <<= VIRTIO_TRANSPORT_F_START; 196 197 mask = -1ULL & ~transport; 198 mask |= VIRTIO_RING_F_INDIRECT_DESC; 199 mask |= VIRTIO_RING_F_EVENT_IDX; 200 mask |= VIRTIO_F_VERSION_1; 201 202 return (features & mask); 203 } 204 205 int 206 virtio_bus_is_modern(device_t dev) 207 { 208 uintptr_t modern; 209 210 virtio_read_ivar(dev, VIRTIO_IVAR_MODERN, &modern); 211 return (modern != 0); 212 } 213 214 void 215 virtio_read_device_config_array(device_t dev, bus_size_t offset, void *dst, 216 int size, int count) 217 { 218 int i, gen; 219 220 do { 221 gen = virtio_config_generation(dev); 222 223 for (i = 0; i < count; i++) { 224 virtio_read_device_config(dev, offset + i * size, 225 (uint8_t *) dst + i * size, size); 226 } 227 } while (gen != virtio_config_generation(dev)); 228 } 229 230 /* 231 * VirtIO bus method wrappers. 232 */ 233 234 void 235 virtio_read_ivar(device_t dev, int ivar, uintptr_t *val) 236 { 237 238 *val = -1; 239 BUS_READ_IVAR(device_get_parent(dev), dev, ivar, val); 240 } 241 242 void 243 virtio_write_ivar(device_t dev, int ivar, uintptr_t val) 244 { 245 246 BUS_WRITE_IVAR(device_get_parent(dev), dev, ivar, val); 247 } 248 249 uint64_t 250 virtio_negotiate_features(device_t dev, uint64_t child_features) 251 { 252 253 return (VIRTIO_BUS_NEGOTIATE_FEATURES(device_get_parent(dev), 254 child_features)); 255 } 256 257 int 258 virtio_finalize_features(device_t dev) 259 { 260 261 return (VIRTIO_BUS_FINALIZE_FEATURES(device_get_parent(dev))); 262 } 263 264 int 265 virtio_alloc_virtqueues(device_t dev, int flags, int nvqs, 266 struct vq_alloc_info *info) 267 { 268 269 return (VIRTIO_BUS_ALLOC_VIRTQUEUES(device_get_parent(dev), flags, 270 nvqs, info)); 271 } 272 273 int 274 virtio_setup_intr(device_t dev, enum intr_type type) 275 { 276 277 return (VIRTIO_BUS_SETUP_INTR(device_get_parent(dev), type)); 278 } 279 280 int 281 virtio_with_feature(device_t dev, uint64_t feature) 282 { 283 284 return (VIRTIO_BUS_WITH_FEATURE(device_get_parent(dev), feature)); 285 } 286 287 void 288 virtio_stop(device_t dev) 289 { 290 291 VIRTIO_BUS_STOP(device_get_parent(dev)); 292 } 293 294 int 295 virtio_reinit(device_t dev, uint64_t features) 296 { 297 298 return (VIRTIO_BUS_REINIT(device_get_parent(dev), features)); 299 } 300 301 void 302 virtio_reinit_complete(device_t dev) 303 { 304 305 VIRTIO_BUS_REINIT_COMPLETE(device_get_parent(dev)); 306 } 307 308 int 309 virtio_config_generation(device_t dev) 310 { 311 312 return (VIRTIO_BUS_CONFIG_GENERATION(device_get_parent(dev))); 313 } 314 315 void 316 virtio_read_device_config(device_t dev, bus_size_t offset, void *dst, int len) 317 { 318 319 VIRTIO_BUS_READ_DEVICE_CONFIG(device_get_parent(dev), 320 offset, dst, len); 321 } 322 323 void 324 virtio_write_device_config(device_t dev, bus_size_t offset, void *dst, int len) 325 { 326 327 VIRTIO_BUS_WRITE_DEVICE_CONFIG(device_get_parent(dev), 328 offset, dst, len); 329 } 330 331 int 332 virtio_child_pnpinfo_str(device_t busdev __unused, device_t child, char *buf, 333 size_t buflen) 334 { 335 336 /* 337 * All of these PCI fields will be only 16 bits, but on the vtmmio bus 338 * the corresponding fields (only "vendor" and "device_type") are 32 339 * bits. Many virtio drivers can attach below either bus. 340 * Gratuitously expand these two fields to 32-bits to allow sharing PNP 341 * match table data between the mostly-similar buses. 342 * 343 * Subdevice and device_type are redundant in both buses, so I don't 344 * see a lot of PNP utility in exposing the same value under a 345 * different name. 346 */ 347 snprintf(buf, buflen, "vendor=0x%08x device=0x%04x subvendor=0x%04x " 348 "device_type=0x%08x", (unsigned)virtio_get_vendor(child), 349 (unsigned)virtio_get_device(child), 350 (unsigned)virtio_get_subvendor(child), 351 (unsigned)virtio_get_device_type(child)); 352 return (0); 353 } 354 355 static int 356 virtio_modevent(module_t mod, int type, void *unused) 357 { 358 int error; 359 360 switch (type) { 361 case MOD_LOAD: 362 case MOD_QUIESCE: 363 case MOD_UNLOAD: 364 case MOD_SHUTDOWN: 365 error = 0; 366 break; 367 default: 368 error = EOPNOTSUPP; 369 break; 370 } 371 372 return (error); 373 } 374 375 static moduledata_t virtio_mod = { 376 "virtio", 377 virtio_modevent, 378 0 379 }; 380 381 DECLARE_MODULE(virtio, virtio_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST); 382 MODULE_VERSION(virtio, 1); 383