virtio.c revision 256281
1/*- 2 * Copyright (c) 2011, Bryan Venteicher <bryanv@FreeBSD.org> 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 unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: stable/10/sys/dev/virtio/virtio.c 252707 2013-07-04 17:57:26Z bryanv $"); 29 30#include <sys/param.h> 31#include <sys/systm.h> 32#include <sys/kernel.h> 33#include <sys/malloc.h> 34#include <sys/module.h> 35#include <sys/sbuf.h> 36 37#include <machine/bus.h> 38#include <machine/resource.h> 39#include <sys/bus.h> 40#include <sys/rman.h> 41 42#include <dev/virtio/virtio.h> 43#include <dev/virtio/virtqueue.h> 44 45#include "virtio_bus_if.h" 46 47static int virtio_modevent(module_t, int, void *); 48static const char *virtio_feature_name(uint64_t, struct virtio_feature_desc *); 49 50static struct virtio_ident { 51 uint16_t devid; 52 const char *name; 53} virtio_ident_table[] = { 54 { VIRTIO_ID_NETWORK, "Network" }, 55 { VIRTIO_ID_BLOCK, "Block" }, 56 { VIRTIO_ID_CONSOLE, "Console" }, 57 { VIRTIO_ID_ENTROPY, "Entropy" }, 58 { VIRTIO_ID_BALLOON, "Balloon" }, 59 { VIRTIO_ID_IOMEMORY, "IOMemory" }, 60 { VIRTIO_ID_SCSI, "SCSI" }, 61 { VIRTIO_ID_9P, "9P Transport" }, 62 63 { 0, NULL } 64}; 65 66/* Device independent features. */ 67static struct virtio_feature_desc virtio_common_feature_desc[] = { 68 { VIRTIO_F_NOTIFY_ON_EMPTY, "NotifyOnEmpty" }, 69 { VIRTIO_RING_F_INDIRECT_DESC, "RingIndirect" }, 70 { VIRTIO_RING_F_EVENT_IDX, "EventIdx" }, 71 { VIRTIO_F_BAD_FEATURE, "BadFeature" }, 72 73 { 0, NULL } 74}; 75 76const char * 77virtio_device_name(uint16_t devid) 78{ 79 struct virtio_ident *ident; 80 81 for (ident = virtio_ident_table; ident->name != NULL; ident++) { 82 if (ident->devid == devid) 83 return (ident->name); 84 } 85 86 return (NULL); 87} 88 89static const char * 90virtio_feature_name(uint64_t val, struct virtio_feature_desc *desc) 91{ 92 int i, j; 93 struct virtio_feature_desc *descs[2] = { desc, 94 virtio_common_feature_desc }; 95 96 for (i = 0; i < 2; i++) { 97 if (descs[i] == NULL) 98 continue; 99 100 for (j = 0; descs[i][j].vfd_val != 0; j++) { 101 if (val == descs[i][j].vfd_val) 102 return (descs[i][j].vfd_str); 103 } 104 } 105 106 return (NULL); 107} 108 109void 110virtio_describe(device_t dev, const char *msg, 111 uint64_t features, struct virtio_feature_desc *desc) 112{ 113 struct sbuf sb; 114 uint64_t val; 115 char *buf; 116 const char *name; 117 int n; 118 119 if ((buf = malloc(512, M_TEMP, M_NOWAIT)) == NULL) { 120 device_printf(dev, "%s features: %#jx\n", msg, (uintmax_t) features); 121 return; 122 } 123 124 sbuf_new(&sb, buf, 512, SBUF_FIXEDLEN); 125 sbuf_printf(&sb, "%s features: %#jx", msg, (uintmax_t) features); 126 127 for (n = 0, val = 1ULL << 63; val != 0; val >>= 1) { 128 /* 129 * BAD_FEATURE is used to detect broken Linux clients 130 * and therefore is not applicable to FreeBSD. 131 */ 132 if (((features & val) == 0) || val == VIRTIO_F_BAD_FEATURE) 133 continue; 134 135 if (n++ == 0) 136 sbuf_cat(&sb, " <"); 137 else 138 sbuf_cat(&sb, ","); 139 140 name = virtio_feature_name(val, desc); 141 if (name == NULL) 142 sbuf_printf(&sb, "%#jx", (uintmax_t) val); 143 else 144 sbuf_cat(&sb, name); 145 } 146 147 if (n > 0) 148 sbuf_cat(&sb, ">"); 149 150#if __FreeBSD_version < 900020 151 sbuf_finish(&sb); 152 if (sbuf_overflowed(&sb) == 0) 153#else 154 if (sbuf_finish(&sb) == 0) 155#endif 156 device_printf(dev, "%s\n", sbuf_data(&sb)); 157 158 sbuf_delete(&sb); 159 free(buf, M_TEMP); 160} 161 162/* 163 * VirtIO bus method wrappers. 164 */ 165 166void 167virtio_read_ivar(device_t dev, int ivar, uintptr_t *val) 168{ 169 170 *val = -1; 171 BUS_READ_IVAR(device_get_parent(dev), dev, ivar, val); 172} 173 174void 175virtio_write_ivar(device_t dev, int ivar, uintptr_t val) 176{ 177 178 BUS_WRITE_IVAR(device_get_parent(dev), dev, ivar, val); 179} 180 181uint64_t 182virtio_negotiate_features(device_t dev, uint64_t child_features) 183{ 184 185 return (VIRTIO_BUS_NEGOTIATE_FEATURES(device_get_parent(dev), 186 child_features)); 187} 188 189int 190virtio_alloc_virtqueues(device_t dev, int flags, int nvqs, 191 struct vq_alloc_info *info) 192{ 193 194 return (VIRTIO_BUS_ALLOC_VIRTQUEUES(device_get_parent(dev), flags, 195 nvqs, info)); 196} 197 198int 199virtio_setup_intr(device_t dev, enum intr_type type) 200{ 201 202 return (VIRTIO_BUS_SETUP_INTR(device_get_parent(dev), type)); 203} 204 205int 206virtio_with_feature(device_t dev, uint64_t feature) 207{ 208 209 return (VIRTIO_BUS_WITH_FEATURE(device_get_parent(dev), feature)); 210} 211 212void 213virtio_stop(device_t dev) 214{ 215 216 VIRTIO_BUS_STOP(device_get_parent(dev)); 217} 218 219int 220virtio_reinit(device_t dev, uint64_t features) 221{ 222 223 return (VIRTIO_BUS_REINIT(device_get_parent(dev), features)); 224} 225 226void 227virtio_reinit_complete(device_t dev) 228{ 229 230 VIRTIO_BUS_REINIT_COMPLETE(device_get_parent(dev)); 231} 232 233void 234virtio_read_device_config(device_t dev, bus_size_t offset, void *dst, int len) 235{ 236 237 VIRTIO_BUS_READ_DEVICE_CONFIG(device_get_parent(dev), 238 offset, dst, len); 239} 240 241void 242virtio_write_device_config(device_t dev, bus_size_t offset, void *dst, int len) 243{ 244 245 VIRTIO_BUS_WRITE_DEVICE_CONFIG(device_get_parent(dev), 246 offset, dst, len); 247} 248 249static int 250virtio_modevent(module_t mod, int type, void *unused) 251{ 252 int error; 253 254 switch (type) { 255 case MOD_LOAD: 256 case MOD_QUIESCE: 257 case MOD_UNLOAD: 258 case MOD_SHUTDOWN: 259 error = 0; 260 break; 261 default: 262 error = EOPNOTSUPP; 263 break; 264 } 265 266 return (error); 267} 268 269static moduledata_t virtio_mod = { 270 "virtio", 271 virtio_modevent, 272 0 273}; 274 275DECLARE_MODULE(virtio, virtio_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST); 276MODULE_VERSION(virtio, 1); 277