Add new drivers for virtio network (vio) and block devices (vioblk, the disks

attach as scsi disks).  These are paravirtualized devices offered by some
hypervisors like kvm and virtualbox.

The virtio transport driver has the pci specific parts separated out. This
will make it easier to add support for mmio (e.g. for ARM) later.

OK mikeb
OK jasper
"commit what you have" deraadt

1 files changed, 75 insertions, 0 deletions

diff --git a/sys/dev/pci/vioblkreg.h b/sys/dev/pci/vioblkreg.h
new file mode 100644
index 00000000000..81d90064895
--- /dev/null
+++ b/sys/dev/pci/vioblkreg.h
@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2012 Stefan Fritsch.
+ * Copyright (c) 2010 Minoura Makoto.
+ * Copyright (c) 1998, 2001 Manuel Bouyer.
+ * All rights reserved.
+ *
+ * This code is based in part on the NetBSD ld_virtio driver and the
+ * OpenBSD wd driver.
+ *
+ * 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, 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.
+ */
+
+/* Configuration registers */
+#define VIRTIO_BLK_CONFIG_CAPACITY	0 /* 64bit */
+#define VIRTIO_BLK_CONFIG_SIZE_MAX	8 /* 32bit */
+#define VIRTIO_BLK_CONFIG_SEG_MAX	12 /* 32bit */
+#define VIRTIO_BLK_CONFIG_GEOMETRY_C	16 /* 16bit */
+#define VIRTIO_BLK_CONFIG_GEOMETRY_H	18 /* 8bit */
+#define VIRTIO_BLK_CONFIG_GEOMETRY_S	19 /* 8bit */
+#define VIRTIO_BLK_CONFIG_BLK_SIZE	20 /* 32bit */
+
+/* Feature bits */
+#define VIRTIO_BLK_F_BARRIER	(1<<0)
+#define VIRTIO_BLK_F_SIZE_MAX	(1<<1)
+#define VIRTIO_BLK_F_SEG_MAX	(1<<2)
+#define VIRTIO_BLK_F_GEOMETRY	(1<<4)
+#define VIRTIO_BLK_F_RO		(1<<5)
+#define VIRTIO_BLK_F_BLK_SIZE	(1<<6)
+#define VIRTIO_BLK_F_SCSI	(1<<7)
+#define VIRTIO_BLK_F_FLUSH	(1<<9)
+#define VIRTIO_BLK_F_TOPOLOGY	(1<<10)
+
+/* Command */
+#define VIRTIO_BLK_T_IN			0
+#define VIRTIO_BLK_T_OUT		1
+#define VIRTIO_BLK_T_SCSI_CMD		2
+#define VIRTIO_BLK_T_SCSI_CMD_OUT	3
+#define VIRTIO_BLK_T_FLUSH		4
+#define VIRTIO_BLK_T_FLUSH_OUT		5
+#define VIRTIO_BLK_T_GET_ID		8 /* from qemu, not in spec, yet */
+#define VIRTIO_BLK_T_BARRIER		0x80000000
+
+/* Status */
+#define VIRTIO_BLK_S_OK		0
+#define VIRTIO_BLK_S_IOERR	1
+
+#define VIRTIO_BLK_ID_BYTES	20 /* length of serial number */
+
+/* Request header structure */
+struct virtio_blk_req_hdr {
+	uint32_t	type;	/* VIRTIO_BLK_T_* */
+	uint32_t	ioprio;
+	uint64_t	sector;
+} __packed;
+/* 512*virtio_blk_req_hdr.sector byte payload and 1 byte status follows */
+
+#define VIRTIO_BLK_SECTOR_SIZE	512