2 * Copyright (c) 2011, Bryan Venteicher <bryanv@daemoninthecloset.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
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.
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.
26 * $FreeBSD: src/sys/dev/virtio/virtio.c,v 1.1 2011/11/18 05:43:43 grehan Exp $
29 #include <sys/param.h>
30 #include <sys/systm.h>
31 #include <sys/kernel.h>
32 #include <sys/malloc.h>
33 #include <sys/module.h>
36 #include <machine/inttypes.h>
38 #include <sys/serialize.h>
42 #include "virtqueue.h"
44 #include "virtio_if.h"
45 #include "virtio_bus_if.h"
47 static int virtio_modevent(module_t, int, void *);
48 static const char *virtio_feature_name(uint64_t, struct virtio_feature_desc *);
50 static struct virtio_ident {
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_9P, "9P Transport" },
65 /* Device independent features. */
66 static struct virtio_feature_desc virtio_common_feature_desc[] = {
67 { VIRTIO_F_NOTIFY_ON_EMPTY, "NotifyOnEmpty" },
68 { VIRTIO_RING_F_EVENT_IDX, "EventIdx" },
69 { VIRTIO_F_BAD_FEATURE, "BadFeature" },
75 virtio_device_name(uint16_t devid)
77 struct virtio_ident *ident;
79 for (ident = virtio_ident_table; ident->name != NULL; ident++) {
80 if (ident->devid == devid)
88 virtio_get_device_type(device_t dev)
94 BUS_READ_IVAR(device_get_parent(dev), dev,
95 VIRTIO_IVAR_DEVTYPE, &devtype);
97 return ((int) devtype);
101 virtio_set_feature_desc(device_t dev,
102 struct virtio_feature_desc *feature_desc)
105 BUS_WRITE_IVAR(device_get_parent(dev), dev,
106 VIRTIO_IVAR_FEATURE_DESC, (uintptr_t) feature_desc);
110 virtio_describe(device_t dev, const char *msg,
111 uint64_t features, struct virtio_feature_desc *desc)
119 if ((buf = kmalloc(512, M_TEMP, M_NOWAIT)) == NULL) {
120 device_printf(dev, "%s features: 0x%"PRIx64"\n", msg,
125 sbuf_new(&sb, buf, 512, SBUF_FIXEDLEN);
126 sbuf_printf(&sb, "%s features: 0x%"PRIx64, msg, features);
128 for (n = 0, val = 1ULL << 63; val != 0; val >>= 1) {
130 * BAD_FEATURE is used to detect broken Linux clients
131 * and therefore is not applicable to FreeBSD.
133 if (((features & val) == 0) || val == VIRTIO_F_BAD_FEATURE)
141 name = virtio_feature_name(val, desc);
143 sbuf_printf(&sb, "%#jx", (uintmax_t) val);
151 if (sbuf_finish(&sb) == 0)
152 device_printf(dev, "%s\n", sbuf_data(&sb));
159 virtio_feature_name(uint64_t val, struct virtio_feature_desc *desc)
162 struct virtio_feature_desc *descs[2] = { desc,
163 virtio_common_feature_desc };
165 for (i = 0; i < 2; i++) {
166 if (descs[i] == NULL)
169 for (j = 0; descs[i][j].vfd_val != 0; j++) {
170 if (val == descs[i][j].vfd_val)
171 return (descs[i][j].vfd_str);
179 * VirtIO bus method wrappers.
183 virtio_negotiate_features(device_t dev, uint64_t child_features)
185 return (VIRTIO_BUS_NEGOTIATE_FEATURES(device_get_parent(dev),
190 virtio_alloc_virtqueues(device_t dev, int flags, int nvqs,
191 struct vq_alloc_info *info)
193 return (VIRTIO_BUS_ALLOC_VIRTQUEUES(device_get_parent(dev), flags,
198 virtio_setup_intr(device_t dev, lwkt_serialize_t slz)
200 return (VIRTIO_BUS_SETUP_INTR(device_get_parent(dev), slz));
204 virtio_with_feature(device_t dev, uint64_t feature)
206 return (VIRTIO_BUS_WITH_FEATURE(device_get_parent(dev), feature));
210 virtio_stop(device_t dev)
212 VIRTIO_BUS_STOP(device_get_parent(dev));
216 virtio_reinit(device_t dev, uint64_t features)
218 return (VIRTIO_BUS_REINIT(device_get_parent(dev), features));
222 virtio_reinit_complete(device_t dev)
224 VIRTIO_BUS_REINIT_COMPLETE(device_get_parent(dev));
228 virtio_read_device_config(device_t dev, bus_size_t offset, void *dst, int len)
230 VIRTIO_BUS_READ_DEVICE_CONFIG(device_get_parent(dev),
235 virtio_write_device_config(device_t dev, bus_size_t offset, void *dst, int len)
237 VIRTIO_BUS_WRITE_DEVICE_CONFIG(device_get_parent(dev),
242 virtio_modevent(module_t mod, int type, void *unused)
261 static moduledata_t virtio_mod = {
267 DECLARE_MODULE(virtio, virtio_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
268 MODULE_VERSION(virtio, 1);