Import virtio base, PCI front-end, and net/block/balloon drivers.

Tested on Qemu/KVM, VirtualBox, and BHyVe.

Currently built as modules-only on i386/amd64. Man pages not yet hooked
up, pending review.

Submitted by:	Bryan Venteicher  bryanv at daemoninthecloset dot org
Reviewed by:	bz
MFC after:	4 weeks or so

1 files changed, 98 insertions, 0 deletions

diff --git a/sys/dev/virtio/virtqueue.h b/sys/dev/virtio/virtqueue.h
new file mode 100644
index 0000000..e790e65
--- /dev/null
+++ b/sys/dev/virtio/virtqueue.h
@@ -0,0 +1,98 @@
+/*-
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _VIRTIO_VIRTQUEUE_H
+#define _VIRTIO_VIRTQUEUE_H
+
+#include <sys/types.h>
+
+struct virtqueue;
+struct sglist;
+
+/* Support for indirect buffer descriptors. */
+#define VIRTIO_RING_F_INDIRECT_DESC	(1 << 28)
+
+/* The guest publishes the used index for which it expects an interrupt
+ * at the end of the avail ring. Host should ignore the avail->flags field.
+ * The host publishes the avail index for which it expects a kick
+ * at the end of the used ring. Guest should ignore the used->flags field.
+ */
+#define VIRTIO_RING_F_EVENT_IDX		(1 << 29)
+
+/* Device callback for a virtqueue interrupt. */
+typedef int virtqueue_intr_t(void *);
+
+#define VIRTQUEUE_MAX_NAME_SZ	32
+
+/* One for each virtqueue the device wishes to allocate. */
+struct vq_alloc_info {
+	char		   vqai_name[VIRTQUEUE_MAX_NAME_SZ];
+	int		   vqai_maxindirsz;
+	virtqueue_intr_t  *vqai_intr;
+	void		  *vqai_intr_arg;
+	struct virtqueue **vqai_vq;
+};
+
+#define VQ_ALLOC_INFO_INIT(_i,_nsegs,_intr,_arg,_vqp,_str,...) do {	\
+	snprintf((_i)->vqai_name, VIRTQUEUE_MAX_NAME_SZ, _str,		\
+	    ##__VA_ARGS__);						\
+	(_i)->vqai_maxindirsz = (_nsegs);				\
+	(_i)->vqai_intr = (_intr);					\
+	(_i)->vqai_intr_arg = (_arg);					\
+	(_i)->vqai_vq = (_vqp);						\
+} while (0)
+
+uint64_t virtqueue_filter_features(uint64_t features);
+
+int	 virtqueue_alloc(device_t dev, uint16_t queue, uint16_t size,
+	     int align, vm_paddr_t highaddr, struct vq_alloc_info *info,
+	     struct virtqueue **vqp);
+void	*virtqueue_drain(struct virtqueue *vq, int *last);
+void	 virtqueue_free(struct virtqueue *vq);
+int	 virtqueue_reinit(struct virtqueue *vq, uint16_t size);
+
+int	 virtqueue_intr(struct virtqueue *vq);
+int	 virtqueue_enable_intr(struct virtqueue *vq);
+void	 virtqueue_disable_intr(struct virtqueue *vq);
+
+/* Get physical address of the virtqueue ring. */
+vm_paddr_t virtqueue_paddr(struct virtqueue *vq);
+
+int	 virtqueue_full(struct virtqueue *vq);
+int	 virtqueue_empty(struct virtqueue *vq);
+int	 virtqueue_size(struct virtqueue *vq);
+int	 virtqueue_nused(struct virtqueue *vq);
+void	 virtqueue_notify(struct virtqueue *vq);
+void	 virtqueue_dump(struct virtqueue *vq);
+
+int	 virtqueue_enqueue(struct virtqueue *vq, void *cookie,
+	     struct sglist *sg, int readable, int writable);
+void	*virtqueue_dequeue(struct virtqueue *vq, uint32_t *len);
+void	*virtqueue_poll(struct virtqueue *vq, uint32_t *len);
+
+#endif /* _VIRTIO_VIRTQUEUE_H */