1/*-
2 * Copyright (c) 2011, Bryan Venteicher <bryanv@daemoninthecloset.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.

--- 9 unchanged lines hidden (view full) ---

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: head/sys/dev/virtio/virtio.c 241470 2012-10-11 23:41:18Z grehan $");
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 <machine/_inttypes.h>
40#include <sys/bus.h>
41#include <sys/rman.h>
42
43#include <dev/virtio/virtio.h>
44#include <dev/virtio/virtqueue.h>
45
46#include "virtio_bus_if.h"
47
48static int virtio_modevent(module_t, int, void *);
49static const char *virtio_feature_name(uint64_t, struct virtio_feature_desc *);
50
51static struct virtio_ident {
52 uint16_t devid;
53 char *name;
54} virtio_ident_table[] = {
55 { VIRTIO_ID_NETWORK, "Network" },
56 { VIRTIO_ID_BLOCK, "Block" },
57 { VIRTIO_ID_CONSOLE, "Console" },
58 { VIRTIO_ID_ENTROPY, "Entropy" },
59 { VIRTIO_ID_BALLOON, "Balloon" },
60 { VIRTIO_ID_IOMEMORY, "IOMemory" },
61 { VIRTIO_ID_SCSI, "SCSI" },

--- 20 unchanged lines hidden (view full) ---

82 for (ident = virtio_ident_table; ident->name != NULL; ident++) {
83 if (ident->devid == devid)
84 return (ident->name);
85 }
86
87 return (NULL);
88}
89
90void
91virtio_describe(device_t dev, const char *msg,
92 uint64_t features, struct virtio_feature_desc *feature_desc)
93{
94 struct sbuf sb;
95 uint64_t val;
96 char *buf;
97 const char *name;
98 int n;
99
100 if ((buf = malloc(512, M_TEMP, M_NOWAIT)) == NULL) {
101 device_printf(dev, "%s features: 0x%"PRIx64"\n", msg,
102 features);
103 return;
104 }
105
106 sbuf_new(&sb, buf, 512, SBUF_FIXEDLEN);
107 sbuf_printf(&sb, "%s features: 0x%"PRIx64, msg, features);
108
109 for (n = 0, val = 1ULL << 63; val != 0; val >>= 1) {
110 /*
111 * BAD_FEATURE is used to detect broken Linux clients
112 * and therefore is not applicable to FreeBSD.
113 */
114 if (((features & val) == 0) || val == VIRTIO_F_BAD_FEATURE)
115 continue;
116
117 if (n++ == 0)
118 sbuf_cat(&sb, " <");
119 else
120 sbuf_cat(&sb, ",");
121
122 name = NULL;
123 if (feature_desc != NULL)
124 name = virtio_feature_name(val, feature_desc);
125 if (name == NULL)
126 name = virtio_feature_name(val,
127 virtio_common_feature_desc);
128
129 if (name == NULL)
130 sbuf_printf(&sb, "0x%"PRIx64, val);
131 else
132 sbuf_cat(&sb, name);
133 }
134
135 if (n > 0)
136 sbuf_cat(&sb, ">");
137
138#if __FreeBSD_version < 900020
139 sbuf_finish(&sb);
140 if (sbuf_overflowed(&sb) == 0)
141#else
142 if (sbuf_finish(&sb) == 0)
143#endif
144 device_printf(dev, "%s\n", sbuf_data(&sb));
145
146 sbuf_delete(&sb);
147 free(buf, M_TEMP);
148}
149
150static const char *
151virtio_feature_name(uint64_t val, struct virtio_feature_desc *feature_desc)
152{
153 int i;
154
155 for (i = 0; feature_desc[i].vfd_val != 0; i++)
156 if (val == feature_desc[i].vfd_val)
157 return (feature_desc[i].vfd_str);
158
159 return (NULL);
160}
161
162/*
163 * VirtIO bus method wrappers.
164 */
165
166void
167virtio_read_ivar(device_t dev, int ivar, uintptr_t *val)
168{
169

--- 76 unchanged lines hidden (view full) ---

246 offset, dst, len);
247}
248
249static int
250virtio_modevent(module_t mod, int type, void *unused)
251{
252 int error;
253
254 error = 0;
255
256 switch (type) {
257 case MOD_LOAD:
258 case MOD_QUIESCE:
259 case MOD_UNLOAD:
260 case MOD_SHUTDOWN:
261 break;
262 default:
263 error = EOPNOTSUPP;
264 break;
265 }
266
267 return (error);
268}
269
270static moduledata_t virtio_mod = {
271 "virtio",
272 virtio_modevent,
273 0
274};
275
276DECLARE_MODULE(virtio, virtio_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
277MODULE_VERSION(virtio, 1);