2 * Copyright (c) 2011, Bryan Venteicher <bryanv@FreeBSD.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.
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
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>
37 #include <machine/bus.h>
38 #include <machine/resource.h>
42 #include <dev/virtio/virtio.h>
43 #include <dev/virtio/virtqueue.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_SCSI, "SCSI" },
61 { VIRTIO_ID_9P, "9P Transport" },
66 /* Device independent features. */
67 static 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" },
77 virtio_device_name(uint16_t devid)
79 struct virtio_ident *ident;
81 for (ident = virtio_ident_table; ident->name != NULL; ident++) {
82 if (ident->devid == devid)
90 virtio_feature_name(uint64_t val, struct virtio_feature_desc *desc)
93 struct virtio_feature_desc *descs[2] = { desc,
94 virtio_common_feature_desc };
96 for (i = 0; i < 2; i++) {
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);
110 virtio_describe(device_t dev, const char *msg,
111 uint64_t features, struct virtio_feature_desc *desc)
119 if ((buf = malloc(512, M_TEMP, M_NOWAIT)) == NULL) {
120 device_printf(dev, "%s features: %#jx\n", msg, (uintmax_t) features);
124 sbuf_new(&sb, buf, 512, SBUF_FIXEDLEN);
125 sbuf_printf(&sb, "%s features: %#jx", msg, (uintmax_t) features);
127 for (n = 0, val = 1ULL << 63; val != 0; val >>= 1) {
129 * BAD_FEATURE is used to detect broken Linux clients
130 * and therefore is not applicable to FreeBSD.
132 if (((features & val) == 0) || val == VIRTIO_F_BAD_FEATURE)
140 name = virtio_feature_name(val, desc);
142 sbuf_printf(&sb, "%#jx", (uintmax_t) val);
150 #if __FreeBSD_version < 900020
152 if (sbuf_overflowed(&sb) == 0)
154 if (sbuf_finish(&sb) == 0)
156 device_printf(dev, "%s\n", sbuf_data(&sb));
163 * VirtIO bus method wrappers.
167 virtio_read_ivar(device_t dev, int ivar, uintptr_t *val)
171 BUS_READ_IVAR(device_get_parent(dev), dev, ivar, val);
175 virtio_write_ivar(device_t dev, int ivar, uintptr_t val)
178 BUS_WRITE_IVAR(device_get_parent(dev), dev, ivar, val);
182 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)
194 return (VIRTIO_BUS_ALLOC_VIRTQUEUES(device_get_parent(dev), flags,
199 virtio_setup_intr(device_t dev, enum intr_type type)
202 return (VIRTIO_BUS_SETUP_INTR(device_get_parent(dev), type));
206 virtio_with_feature(device_t dev, uint64_t feature)
209 return (VIRTIO_BUS_WITH_FEATURE(device_get_parent(dev), feature));
213 virtio_stop(device_t dev)
216 VIRTIO_BUS_STOP(device_get_parent(dev));
220 virtio_reinit(device_t dev, uint64_t features)
223 return (VIRTIO_BUS_REINIT(device_get_parent(dev), features));
227 virtio_reinit_complete(device_t dev)
230 VIRTIO_BUS_REINIT_COMPLETE(device_get_parent(dev));
234 virtio_read_device_config(device_t dev, bus_size_t offset, void *dst, int len)
237 VIRTIO_BUS_READ_DEVICE_CONFIG(device_get_parent(dev),
242 virtio_write_device_config(device_t dev, bus_size_t offset, void *dst, int len)
245 VIRTIO_BUS_WRITE_DEVICE_CONFIG(device_get_parent(dev),
250 virtio_modevent(module_t mod, int type, void *unused)
269 static moduledata_t virtio_mod = {
275 DECLARE_MODULE(virtio, virtio_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
276 MODULE_VERSION(virtio, 1);