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>
41 #include "virtqueue.h"
43 #include "virtio_if.h"
44 #include "virtio_bus_if.h"
46 static int virtio_modevent(module_t, int, void *);
47 static const char *virtio_feature_name(uint64_t, struct virtio_feature_desc *);
49 static struct virtio_ident {
52 } virtio_ident_table[] = {
53 { VIRTIO_ID_NETWORK, "Network" },
54 { VIRTIO_ID_BLOCK, "Block" },
55 { VIRTIO_ID_CONSOLE, "Console" },
56 { VIRTIO_ID_ENTROPY, "Entropy" },
57 { VIRTIO_ID_BALLOON, "Balloon" },
58 { VIRTIO_ID_IOMEMORY, "IOMemory" },
59 { VIRTIO_ID_9P, "9P Transport" },
64 /* Device independent features. */
65 static struct virtio_feature_desc virtio_common_feature_desc[] = {
66 { VIRTIO_F_NOTIFY_ON_EMPTY, "NotifyOnEmpty" },
67 { VIRTIO_RING_F_EVENT_IDX, "EventIdx" },
68 { VIRTIO_F_BAD_FEATURE, "BadFeature" },
74 virtio_device_name(uint16_t devid)
76 struct virtio_ident *ident;
78 for (ident = virtio_ident_table; ident->name != NULL; ident++) {
79 if (ident->devid == devid)
87 virtio_get_device_type(device_t dev)
93 BUS_READ_IVAR(device_get_parent(dev), dev,
94 VIRTIO_IVAR_DEVTYPE, &devtype);
96 return ((int) devtype);
100 virtio_set_feature_desc(device_t dev,
101 struct virtio_feature_desc *feature_desc)
104 BUS_WRITE_IVAR(device_get_parent(dev), dev,
105 VIRTIO_IVAR_FEATURE_DESC, (uintptr_t) feature_desc);
108 /* XXX(vsrinivas): Hmm, check this SBUF usage */
110 virtio_describe(device_t dev, const char *msg,
111 uint64_t features, struct virtio_feature_desc *feature_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)
142 if (feature_desc != NULL)
143 name = virtio_feature_name(val, feature_desc);
145 name = virtio_feature_name(val,
146 virtio_common_feature_desc);
149 sbuf_printf(&sb, "0x%"PRIx64, val);
157 #if __FreeBSD_version < 900020
159 if (sbuf_overflowed(&sb) == 0)
161 if (sbuf_finish(&sb) == 0)
163 device_printf(dev, "%s\n", sbuf_data(&sb));
170 virtio_feature_name(uint64_t val, struct virtio_feature_desc *feature_desc)
174 for (i = 0; feature_desc[i].vfd_val != 0; i++)
175 if (val == feature_desc[i].vfd_val)
176 return (feature_desc[i].vfd_str);
182 * VirtIO bus method wrappers.
186 virtio_negotiate_features(device_t dev, uint64_t child_features)
189 return (VIRTIO_BUS_NEGOTIATE_FEATURES(device_get_parent(dev),
194 virtio_alloc_virtqueues(device_t dev, int flags, int nvqs,
195 struct vq_alloc_info *info)
198 return (VIRTIO_BUS_ALLOC_VIRTQUEUES(device_get_parent(dev), flags,
203 virtio_setup_intr(device_t dev)
206 return (VIRTIO_BUS_SETUP_INTR(device_get_parent(dev)));
210 virtio_with_feature(device_t dev, uint64_t feature)
213 return (VIRTIO_BUS_WITH_FEATURE(device_get_parent(dev), feature));
217 virtio_stop(device_t dev)
220 VIRTIO_BUS_STOP(device_get_parent(dev));
224 virtio_reinit(device_t dev, uint64_t features)
227 return (VIRTIO_BUS_REINIT(device_get_parent(dev), features));
231 virtio_reinit_complete(device_t dev)
234 VIRTIO_BUS_REINIT_COMPLETE(device_get_parent(dev));
238 virtio_read_device_config(device_t dev, bus_size_t offset, void *dst, int len)
241 VIRTIO_BUS_READ_DEVICE_CONFIG(device_get_parent(dev),
246 virtio_write_device_config(device_t dev, bus_size_t offset, void *dst, int len)
249 VIRTIO_BUS_WRITE_DEVICE_CONFIG(device_get_parent(dev),
254 virtio_modevent(module_t mod, int type, void *unused)
274 static moduledata_t virtio_mod = {
280 DECLARE_MODULE(virtio, virtio_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
281 MODULE_VERSION(virtio, 1);