WIP: guest-side virtio-9p device driver mock

gistfile1.diff

Index: sys/dev/virtio/9p/virtio_9p.c
===================================================================
--- sys/dev/virtio/9p/virtio_9p.c	(revision 0)
+++ sys/dev/virtio/9p/virtio_9p.c	(working copy)
@@ -0,0 +1,181 @@
+/*-
+ * Copyright (c) 2011, Bryan Venteicher <[email protected]>
+ * 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.
+ */
+
+/* Driver for VirtFS devices. */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/endian.h>
+#include <sys/kthread.h>
+#include <sys/malloc.h>
+#include <sys/module.h>
+#include <sys/sglist.h>
+#include <sys/sysctl.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
+#include <sys/queue.h>
+
+#include <machine/bus.h>
+#include <machine/resource.h>
+#include <sys/bus.h>
+#include <sys/rman.h>
+
+#include <dev/virtio/virtio.h>
+#include <dev/virtio/virtqueue.h>
+#include <dev/virtio/9p/virtio_9p.h>
+
+#include "virtio_if.h"
+
+struct vt9p_softc {
+	device_t		vt9p_dev;
+	struct mtx		vt9p_mtx;
+};
+
+static int	vt9p_modevent(module_t, int, void *);
+
+static int	vt9p_probe(device_t);
+static int	vt9p_attach(device_t);
+static int	vt9p_detach(device_t);
+static int	vt9p_config_change(device_t);
+
+static device_method_t vt9p_methods[] = {
+	/* Device methods. */
+	DEVMETHOD(device_probe,		vt9p_probe),
+	DEVMETHOD(device_attach,	vt9p_attach),
+	DEVMETHOD(device_detach,	vt9p_detach),
+
+	/* VirtIO methods. */
+	DEVMETHOD(virtio_config_change, vt9p_config_change),
+
+	{ 0, 0 }
+};
+
+static driver_t vt9p_driver = {
+	"vt9p",
+	vt9p_methods,
+	sizeof(struct vt9p_softc)
+};
+static devclass_t vt9p_devclass;
+
+DRIVER_MODULE(virtio_9p, virtio_pci, vt9p_driver,
+	vt9p_devclass, vt9p_modevent, 0);
+MODULE_VERSION(virtio_9p, 1);
+MODULE_DEPEND(virito_9p, virtio, 1, 1, 1);
+
+static int
+vt9p_modevent(module_t mod, int type, void *unused)
+{
+	int error = 0;
+
+	printf("%u %s : type = %d\n", __LINE__, __func__, type);
+
+	switch (type) {
+		case MOD_LOAD:
+			break;
+		case MOD_QUIESCE:
+		case MOD_UNLOAD:
+			break;
+		case MOD_SHUTDOWN:
+			break;
+		default:
+			error = EOPNOTSUPP;
+			break;
+	}
+
+	return (error);
+
+}
+
+static int
+vt9p_probe(device_t dev)
+{
+	printf("%u %s : probing  (%x <> VIRTIO_ID_9P %x)\n", __LINE__, __func__, virtio_get_device_type(dev), VIRTIO_ID_9P);
+	if (virtio_get_device_type(dev) != VIRTIO_ID_9P) {
+		return (ENXIO);
+	}
+
+	device_set_desc(dev, "VirtFS");
+
+	return (BUS_PROBE_DEFAULT);
+}
+
+static int
+vt9p_attach(device_t dev)
+{
+	struct vt9p_softc *sc;
+	int error = 0;
+
+	printf("%u %s attach\n", __LINE__, __func__);
+
+	sc = device_get_softc(dev);
+	sc->vt9p_dev = dev;
+
+	/* set feature desc */
+
+	/* negotiate feature */
+
+	/* get page */
+
+	/* alloc virtqueue */
+
+	/* setup intr */
+
+	/* enable queue intr */
+
+//fail:
+	if (error)
+		vt9p_detach(dev);
+
+	return error;
+}
+
+static int
+vt9p_detach(device_t dev)
+{
+	struct vt9p_softc *sc;
+
+	sc = device_get_softc(dev);
+
+	/* free got pages */
+
+	return 0;
+}
+
+static int
+vt9p_config_change(device_t dev)
+{
+	struct vt9p_softc *sc;
+
+	sc = device_get_softc(dev);
+
+	/* do something ? */
+
+	return 1;
+}
Index: sys/dev/virtio/9p/virtio_9p.h
===================================================================