/*-
* Copyright (c) 2011, Bryan Venteicher <bryanv@daemoninthecloset.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/sbuf.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <machine/_inttypes.h>
#include <sys/bus.h>
#include <sys/rman.h>
#include <dev/virtio/virtio.h>
#include <dev/virtio/virtqueue.h>
#include "virtio_bus_if.h"
static int virtio_modevent(module_t, int, void *);
static const char *virtio_feature_name(uint64_t, struct virtio_feature_desc *);
static struct virtio_ident {
uint16_t devid;
char *name;
} virtio_ident_table[] = {
{ VIRTIO_ID_NETWORK, "Network" },
{ VIRTIO_ID_BLOCK, "Block" },
{ VIRTIO_ID_CONSOLE, "Console" },
{ VIRTIO_ID_ENTROPY, "Entropy" },
{ VIRTIO_ID_BALLOON, "Balloon" },
{ VIRTIO_ID_IOMEMORY, "IOMemory" },
{ VIRTIO_ID_9P, "9P Transport" },
{ 0, NULL }
};
/* Device independent features. */
static struct virtio_feature_desc virtio_common_feature_desc[] = {
{ VIRTIO_F_NOTIFY_ON_EMPTY, "NotifyOnEmpty" },
{ VIRTIO_RING_F_INDIRECT_DESC, "RingIndirect" },
{ VIRTIO_RING_F_EVENT_IDX, "EventIdx" },
{ VIRTIO_F_BAD_FEATURE, "BadFeature" },
{ 0, NULL }
};
const char *
virtio_device_name(uint16_t devid)
{
struct virtio_ident *ident;
for (ident = virtio_ident_table; ident->name != NULL; ident++) {
if (ident->devid == devid)
return (ident->name);
}
return (NULL);
}
int
virtio_get_device_type(device_t dev)
{
uintptr_t devtype;
devtype = -1;
BUS_READ_IVAR(device_get_parent(dev), dev,
VIRTIO_IVAR_DEVTYPE, &devtype);
return ((int) devtype);
}
void
virtio_set_feature_desc(device_t dev,
struct virtio_feature_desc *feature_desc)
{
BUS_WRITE_IVAR(device_get_parent(dev), dev,
VIRTIO_IVAR_FEATURE_DESC, (uintptr_t) feature_desc);
}
void
virtio_describe(device_t dev, const char *msg,
uint64_t features, struct virtio_feature_desc *feature_desc)
{
struct sbuf sb;
uint64_t val;
char *buf;
const char *name;
int n;
if ((buf = malloc(512, M_TEMP, M_NOWAIT)) == NULL) {
device_printf(dev, "%s features: 0x%"PRIx64"\n", msg,
features);
return;
}
sbuf_new(&sb, buf, 512, SBUF_FIXEDLEN);
sbuf_printf(&sb, "%s features: 0x%"PRIx64, msg, features);
for (n = 0, val = 1ULL << 63; val != 0; val >>= 1) {
/*
* BAD_FEATURE is used to detect broken Linux clients
* and therefore is not applicable to FreeBSD.
*/
if (((features & val) == 0) || val == VIRTIO_F_BAD_FEATURE)
continue;
if (n++ == 0)
sbuf_cat(&sb, " <");
else
sbuf_cat(&sb, ",");
name = NULL;
if (feature_desc != NULL)
name = virtio_feature_name(val, feature_desc);
if (name == NULL)
name = virtio_feature_name(val,
virtio_common_feature_desc);
if (name == NULL)
sbuf_printf(&sb, "0x%"PRIx64, val);
else
sbuf_cat(&sb, name);
}
if (n > 0)
sbuf_cat(&sb, ">");
#if __FreeBSD_version < 900020
sbuf_finish(&sb);
if (sbuf_overflowed(&sb) == 0)
#else
if (sbuf_finish(&sb) == 0)
#endif
device_printf(dev, "%s\n", sbuf_data(&sb));
sbuf_delete(&sb);
free(buf, M_TEMP);
}
static const char *
virtio_feature_name(uint64_t val, struct virtio_feature_desc *feature_desc)
{
int i;
for (i = 0; feature_desc[i].vfd_val != 0; i++)
if (val == feature_desc[i].vfd_val)
return (feature_desc[i].vfd_str);
return (NULL);
}
/*
* VirtIO bus method wrappers.
*/
uint64_t
virtio_negotiate_features(device_t dev, uint64_t child_features)
{
return (VIRTIO_BUS_NEGOTIATE_FEATURES(device_get_parent(dev),
child_features));
}
int
virtio_alloc_virtqueues(device_t dev, int flags, int nvqs,
struct vq_alloc_info *info)
{
return (VIRTIO_BUS_ALLOC_VIRTQUEUES(device_get_parent(dev), flags,
nvqs, info));
}
int
virtio_setup_intr(device_t dev, enum intr_type type)
{
return (VIRTIO_BUS_SETUP_INTR(device_get_parent(dev), type));
}
int
virtio_with_feature(device_t dev, uint64_t feature)
{
return (VIRTIO_BUS_WITH_FEATURE(device_get_parent(dev), feature));
}
void
virtio_stop(device_t dev)
{
VIRTIO_BUS_STOP(device_get_parent(dev));
}
int
virtio_reinit(device_t dev, uint64_t features)
{
return (VIRTIO_BUS_REINIT(device_get_parent(dev), features));
}
void
virtio_reinit_complete(device_t dev)
{
VIRTIO_BUS_REINIT_COMPLETE(device_get_parent(dev));
}
void
virtio_read_device_config(device_t dev, bus_size_t offset, void *dst, int len)
{
VIRTIO_BUS_READ_DEVICE_CONFIG(device_get_parent(dev),
offset, dst, len);
}
void
virtio_write_device_config(device_t dev, bus_size_t offset, void *dst, int len)
{
VIRTIO_BUS_WRITE_DEVICE_CONFIG(device_get_parent(dev),
offset, dst, len);
}
static int
virtio_modevent(module_t mod, int type, void *unused)
{
int error;
error = 0;
switch (type) {
case MOD_LOAD:
case MOD_QUIESCE:
case MOD_UNLOAD:
case MOD_SHUTDOWN:
break;
default:
error = EOPNOTSUPP;
break;
}
return (error);
}
static moduledata_t virtio_mod = {
"virtio",
virtio_modevent,
0
};
DECLARE_MODULE(virtio, virtio_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
MODULE_VERSION(virtio, 1);
