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