Module Name: src
Committed By: ozaki-r
Date: Mon Oct 28 02:56:41 UTC 2019
Modified Files:
src/distrib/sets/lists/man: mi
src/share/man/man4: Makefile
src/sys/conf: majors
src/sys/dev/pci: files.virtio
src/sys/modules: Makefile
Added Files:
src/share/man/man4: vio9p.4
src/sys/dev/pci: vio9p.c
src/sys/modules/vio9p: Makefile vio9p.ioconf
Log Message:
Implement a front-end driver of virtio-9p called vio9p
In conjunction with mount_9p, it enables a NetBSD system running as a VM guest
to mount an exported filesystem by the host via virtio-9p. It exports a 9p
end-point of virtio-9p via a character device file for mount_9p.
Reviewed by yamaguchi@
To generate a diff of this commit:
cvs rdiff -u -r1.1658 -r1.1659 src/distrib/sets/lists/man/mi
cvs rdiff -u -r1.685 -r1.686 src/share/man/man4/Makefile
cvs rdiff -u -r0 -r1.1 src/share/man/man4/vio9p.4
cvs rdiff -u -r1.89 -r1.90 src/sys/conf/majors
cvs rdiff -u -r1.1 -r1.2 src/sys/dev/pci/files.virtio
cvs rdiff -u -r0 -r1.1 src/sys/dev/pci/vio9p.c
cvs rdiff -u -r1.227 -r1.228 src/sys/modules/Makefile
cvs rdiff -u -r0 -r1.1 src/sys/modules/vio9p/Makefile \
src/sys/modules/vio9p/vio9p.ioconf
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/distrib/sets/lists/man/mi
diff -u src/distrib/sets/lists/man/mi:1.1658 src/distrib/sets/lists/man/mi:1.1659
--- src/distrib/sets/lists/man/mi:1.1658 Fri Oct 25 17:39:56 2019
+++ src/distrib/sets/lists/man/mi Mon Oct 28 02:56:40 2019
@@ -1,4 +1,4 @@
-# $NetBSD: mi,v 1.1658 2019/10/25 17:39:56 martin Exp $
+# $NetBSD: mi,v 1.1659 2019/10/28 02:56:40 ozaki-r Exp $
#
# Note: don't delete entries from here - mark them as "obsolete" instead.
#
@@ -1990,6 +1990,7 @@
./usr/share/man/cat4/viapm.0 man-obsolete obsolete
./usr/share/man/cat4/video.0 man-sys-catman .cat
./usr/share/man/cat4/vinum.0 man-obsolete obsolete
+./usr/share/man/cat4/vio9p.0 man-sys-catman .cat
./usr/share/man/cat4/vioif.0 man-sys-catman .cat
./usr/share/man/cat4/viomb.0 man-sys-catman .cat
./usr/share/man/cat4/viornd.0 man-sys-catman .cat
@@ -5085,6 +5086,7 @@
./usr/share/man/html4/viaenv.html man-sys-htmlman html
./usr/share/man/html4/viaide.html man-sys-htmlman html
./usr/share/man/html4/video.html man-sys-htmlman html
+./usr/share/man/html4/vio9p.html man-sys-htmlman html
./usr/share/man/html4/vioif.html man-sys-htmlman html
./usr/share/man/html4/viomb.html man-sys-htmlman html
./usr/share/man/html4/viornd.html man-sys-htmlman html
@@ -8112,6 +8114,7 @@
./usr/share/man/man4/viapm.4 man-obsolete obsolete
./usr/share/man/man4/video.4 man-sys-man .man
./usr/share/man/man4/vinum.4 man-obsolete obsolete
+./usr/share/man/man4/vio9p.4 man-sys-man .man
./usr/share/man/man4/vioif.4 man-sys-man .man
./usr/share/man/man4/viomb.4 man-sys-man .man
./usr/share/man/man4/viornd.4 man-sys-man .man
Index: src/share/man/man4/Makefile
diff -u src/share/man/man4/Makefile:1.685 src/share/man/man4/Makefile:1.686
--- src/share/man/man4/Makefile:1.685 Fri Oct 25 17:39:57 2019
+++ src/share/man/man4/Makefile Mon Oct 28 02:56:40 2019
@@ -1,4 +1,4 @@
-# $NetBSD: Makefile,v 1.685 2019/10/25 17:39:57 martin Exp $
+# $NetBSD: Makefile,v 1.686 2019/10/28 02:56:40 ozaki-r Exp $
# @(#)Makefile 8.1 (Berkeley) 6/18/93
MAN= aac.4 ac97.4 acardide.4 aceride.4 acphy.4 \
@@ -66,9 +66,9 @@ MAN= aac.4 ac97.4 acardide.4 aceride.4 a
trm.4 tsllux.4 tty.4 tun.4 tqphy.4 twa.4 twe.4 txp.4 \
uark.4 ubsec.4 udp.4 uep.4 ug.4 uha.4 uk.4 ukphy.4 umb.4 \
unix.4 userconf.4 \
- vald.4 valz.4 veriexec.4 vga.4 vge.4 viaide.4 video.4 vioif.4 viomb.4 \
- viornd.4 vioscsi.4 virt.4 \
- virtio.4 vlan.4 vmmon.4 vmnet.4 vnd.4 voodoofb.4 vr.4 vte.4 \
+ vald.4 valz.4 veriexec.4 vga.4 vge.4 viaide.4 video.4 \
+ vio9p.4 vioif.4 viomb.4 viornd.4 vioscsi.4 virt.4 virtio.4 \
+ vlan.4 vmmon.4 vmnet.4 vnd.4 voodoofb.4 vr.4 vte.4 \
wapbl.4 wb.4 wbsio.4 wd.4 wdc.4 wi.4 wm.4 wpi.4 \
wsbell.4 wscons.4 wsdisplay.4 wsfont.4 wskbd.4 wsmouse.4 wsmux.4 \
xbox.4 xge.4 \
Index: src/sys/conf/majors
diff -u src/sys/conf/majors:1.89 src/sys/conf/majors:1.90
--- src/sys/conf/majors:1.89 Sun Sep 15 11:45:47 2019
+++ src/sys/conf/majors Mon Oct 28 02:56:40 2019
@@ -1,4 +1,4 @@
-# $NetBSD: majors,v 1.89 2019/09/15 11:45:47 maxv Exp $
+# $NetBSD: majors,v 1.90 2019/10/28 02:56:40 ozaki-r Exp $
#
# Device majors for Machine-Independent drivers.
#
@@ -87,3 +87,4 @@ device-major spi char 347 spi
# Major 353 is reserved for external/cddl/osnet/dev/sdt/sdt.c
device-major ipmi char 354 ipmi
device-major vhci char 355 vhci
+device-major vio9p char 356 vio9p
Index: src/sys/dev/pci/files.virtio
diff -u src/sys/dev/pci/files.virtio:1.1 src/sys/dev/pci/files.virtio:1.2
--- src/sys/dev/pci/files.virtio:1.1 Wed Aug 2 08:39:14 2017
+++ src/sys/dev/pci/files.virtio Mon Oct 28 02:56:40 2019
@@ -1,4 +1,4 @@
-# $NetBSD: files.virtio,v 1.1 2017/08/02 08:39:14 cherry Exp $
+# $NetBSD: files.virtio,v 1.2 2019/10/28 02:56:40 ozaki-r Exp $
# VirtIO
device virtio {}
@@ -23,3 +23,6 @@ device vioscsi: scsi
attach vioscsi at virtio
file dev/pci/vioscsi.c vioscsi
+device vio9p
+attach vio9p at virtio
+file dev/pci/vio9p.c vio9p
Index: src/sys/modules/Makefile
diff -u src/sys/modules/Makefile:1.227 src/sys/modules/Makefile:1.228
--- src/sys/modules/Makefile:1.227 Sun Sep 22 22:59:39 2019
+++ src/sys/modules/Makefile Mon Oct 28 02:56:40 2019
@@ -1,4 +1,4 @@
-# $NetBSD: Makefile,v 1.227 2019/09/22 22:59:39 christos Exp $
+# $NetBSD: Makefile,v 1.228 2019/10/28 02:56:40 ozaki-r Exp $
.include <bsd.own.mk>
@@ -458,6 +458,7 @@ SUBDIR+= ld_nvme
SUBDIR+= nvme
SUBDIR+= twa
SUBDIR+= twe
+SUBDIR+= vio9p
SUBDIR+= viomb
SUBDIR+= virtio
SUBDIR+= virtio_pci
Added files:
Index: src/share/man/man4/vio9p.4
diff -u /dev/null src/share/man/man4/vio9p.4:1.1
--- /dev/null Mon Oct 28 02:56:41 2019
+++ src/share/man/man4/vio9p.4 Mon Oct 28 02:56:40 2019
@@ -0,0 +1,70 @@
+.\" $NetBSD: vio9p.4,v 1.1 2019/10/28 02:56:40 ozaki-r Exp $
+.\"
+.\" Copyright (c) 2019 Internet Initiative Japan, Inc.
+.\" 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, 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``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 FOUNDATION OR CONTRIBUTORS
+.\" 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.
+.\"
+.Dd October 24, 2019
+.Dt VIO9P 4
+.Os
+.Sh NAME
+.Nm vio9p
+.Nd VirtIO 9p front-end driver
+.Sh SYNOPSIS
+.Cd "vio9p* at virtio?"
+.Sh DESCRIPTION
+In conjunction with
+.Xr mount_9p 8 , the
+.Nm
+driver enables a NetBSD system running as a VM guest to mount an exported filesystem
+by the host via virtio-9p.
+It exports a 9p end-point of virtio-9p via a character device file for
+.Xr mount_9p 8 .
+.Pp
+Each exported filesystem is assigned a character device and accesible via
+.Pa /dev/vio9p0 ,
+.Pa /dev/vio9p1
+and so on, respectively in exporting order by the host.
+.Sh FILES
+.Bl -tag -width XdevXvio9pX -compact
+.It Pa /dev/vio9p?
+.El
+.Sh EXAMPLES
+The following command mounts a first exported filesystem by the host at
+.Pa /mnt/9p :
+.Bd -literal -offset indent
+# mount_9p -cu /dev/vio9p0 /mnt/9p
+.Ed
+.Sh SEE ALSO
+.Xr mount_9p 8 ,
+.Xr virtio 4
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Nx 10.0 .
+.Sh AUTHORS
+The
+.Nm
+driver was written by
+.An Ryota Ozaki Aq Mt [email protected] .
Index: src/sys/dev/pci/vio9p.c
diff -u /dev/null src/sys/dev/pci/vio9p.c:1.1
--- /dev/null Mon Oct 28 02:56:41 2019
+++ src/sys/dev/pci/vio9p.c Mon Oct 28 02:56:40 2019
@@ -0,0 +1,643 @@
+/* $NetBSD: vio9p.c,v 1.1 2019/10/28 02:56:40 ozaki-r Exp $ */
+
+/*
+ * Copyright (c) 2019 Internet Initiative Japan, Inc.
+ * 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, 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>
+__KERNEL_RCSID(0, "$NetBSD: vio9p.c,v 1.1 2019/10/28 02:56:40 ozaki-r Exp $");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/bus.h>
+#include <sys/conf.h>
+#include <sys/condvar.h>
+#include <sys/device.h>
+#include <sys/mutex.h>
+#include <sys/sysctl.h>
+#include <sys/module.h>
+#include <sys/syslog.h>
+#include <sys/select.h>
+#include <sys/kmem.h>
+
+#include <sys/file.h>
+#include <sys/filedesc.h>
+#include <sys/uio.h>
+
+#include <dev/pci/virtioreg.h>
+#include <dev/pci/virtiovar.h>
+
+#include "ioconf.h"
+
+//#define VIO9P_DEBUG 1
+//#define VIO9P_DUMP 1
+#ifdef VIO9P_DEBUG
+#define DLOG(fmt, args...) \
+ do { log(LOG_DEBUG, "%s: " fmt "\n", __func__, ##args); } while (0)
+#else
+#define DLOG(fmt, args...) __nothing
+#endif
+
+/* Configuration registers */
+#define VIO9P_CONFIG_TAG_LEN 0 /* 16bit */
+#define VIO9P_CONFIG_TAG 2
+
+#define VIO9P_FLAG_BITS VIRTIO_COMMON_FLAG_BITS
+
+// Must be the same as P9P_DEFREQLEN of usr.sbin/puffs/mount_9p/ninepuffs.h
+#define VIO9P_MAX_REQLEN (16 * 1024)
+#define VIO9P_SEGSIZE PAGE_SIZE
+#define VIO9P_N_SEGMENTS (VIO9P_MAX_REQLEN / VIO9P_SEGSIZE)
+
+#define P9_MAX_TAG_LEN 16
+
+CTASSERT((PAGE_SIZE) == (VIRTIO_PAGE_SIZE)); /* XXX */
+
+struct vio9p_softc {
+ device_t sc_dev;
+
+ struct virtio_softc *sc_virtio;
+ struct virtqueue sc_vq[1];
+
+ uint16_t sc_taglen;
+ uint8_t sc_tag[P9_MAX_TAG_LEN + 1];
+
+ int sc_flags;
+#define VIO9P_INUSE __BIT(0)
+
+ int sc_state;
+#define VIO9P_S_INIT 0
+#define VIO9P_S_REQUESTING 1
+#define VIO9P_S_REPLIED 2
+#define VIO9P_S_CONSUMING 3
+ kcondvar_t sc_wait;
+ struct selinfo sc_sel;
+ kmutex_t sc_lock;
+
+ bus_dmamap_t sc_dmamap_tx;
+ bus_dmamap_t sc_dmamap_rx;
+ char *sc_buf_tx;
+ char *sc_buf_rx;
+ size_t sc_buf_rx_len;
+ off_t sc_buf_rx_offset;
+};
+
+/*
+ * Locking notes:
+ * - sc_state, sc_wait and sc_sel are protected by sc_lock
+ *
+ * The state machine (sc_state):
+ * - INIT =(write from client)=> REQUESTING
+ * - REQUESTING =(reply from host)=> REPLIED
+ * - REPLIED =(read from client)=> CONSUMING
+ * - CONSUMING =(read completed(*))=> INIT
+ *
+ * (*) read may not finish by one read(2) request, then
+ * the state remains CONSUMING.
+ */
+
+static int vio9p_match(device_t, cfdata_t, void *);
+static void vio9p_attach(device_t, device_t, void *);
+static void vio9p_read_config(struct vio9p_softc *);
+static int vio9p_request_done(struct virtqueue *);
+
+static int vio9p_read(struct file *, off_t *, struct uio *, kauth_cred_t,
+ int);
+static int vio9p_write(struct file *, off_t *, struct uio *,
+ kauth_cred_t, int);
+static int vio9p_ioctl(struct file *, u_long, void *);
+static int vio9p_close(struct file *);
+static int vio9p_kqfilter(struct file *, struct knote *);
+
+static const struct fileops vio9p_fileops = {
+ .fo_name = "vio9p",
+ .fo_read = vio9p_read,
+ .fo_write = vio9p_write,
+ .fo_ioctl = vio9p_ioctl,
+ .fo_fcntl = fnullop_fcntl,
+ .fo_poll = fnullop_poll,
+ .fo_stat = fbadop_stat,
+ .fo_close = vio9p_close,
+ .fo_kqfilter = vio9p_kqfilter,
+ .fo_restart = fnullop_restart,
+};
+
+static dev_type_open(vio9p_dev_open);
+
+const struct cdevsw vio9p_cdevsw = {
+ .d_open = vio9p_dev_open,
+ .d_read = noread,
+ .d_write = nowrite,
+ .d_ioctl = noioctl,
+ .d_stop = nostop,
+ .d_tty = notty,
+ .d_poll = nopoll,
+ .d_mmap = nommap,
+ .d_kqfilter = nokqfilter,
+ .d_discard = nodiscard,
+ .d_flag = D_OTHER | D_MPSAFE,
+};
+
+static int
+vio9p_dev_open(dev_t dev, int flag, int mode, struct lwp *l)
+{
+ struct vio9p_softc *sc;
+ struct file *fp;
+ int error, fd;
+
+ sc = device_lookup_private(&vio9p_cd, minor(dev));
+ if (sc == NULL)
+ return ENXIO;
+
+ /* FIXME TOCTOU */
+ if (ISSET(sc->sc_flags, VIO9P_INUSE))
+ return EBUSY;
+
+ /* falloc() will fill in the descriptor for us. */
+ error = fd_allocfile(&fp, &fd);
+ if (error != 0)
+ return error;
+
+ sc->sc_flags |= VIO9P_INUSE;
+
+ return fd_clone(fp, fd, flag, &vio9p_fileops, sc);
+}
+
+static int
+vio9p_ioctl(struct file *fp, u_long cmd, void *addr)
+{
+ int error = 0;
+
+ switch (cmd) {
+ case FIONBIO:
+ break;
+ default:
+ error = EINVAL;
+ break;
+ }
+
+ return error;
+}
+
+static int
+vio9p_read(struct file *fp, off_t *offp, struct uio *uio,
+ kauth_cred_t cred, int flags)
+{
+ struct vio9p_softc *sc = fp->f_data;
+ struct virtio_softc *vsc = sc->sc_virtio;
+ struct virtqueue *vq = &sc->sc_vq[0];
+ int error, slot, len;
+
+ DLOG("enter");
+
+ mutex_enter(&sc->sc_lock);
+
+ if (sc->sc_state == VIO9P_S_INIT) {
+ DLOG("%s: not requested", device_xname(sc->sc_dev));
+ error = EAGAIN;
+ goto out;
+ }
+
+ if (sc->sc_state == VIO9P_S_CONSUMING) {
+ KASSERT(sc->sc_buf_rx_len > 0);
+ /* We already have some remaining, consume it. */
+ len = sc->sc_buf_rx_len - sc->sc_buf_rx_offset;
+ goto consume;
+ }
+
+#if 0
+ if (uio->uio_resid != VIO9P_MAX_REQLEN)
+ return EINVAL;
+#else
+ if (uio->uio_resid > VIO9P_MAX_REQLEN) {
+ error = EINVAL;
+ goto out;
+ }
+#endif
+
+ error = 0;
+ while (sc->sc_state == VIO9P_S_REQUESTING) {
+ error = cv_timedwait_sig(&sc->sc_wait, &sc->sc_lock, hz);
+ if (error != 0)
+ break;
+ }
+ if (sc->sc_state == VIO9P_S_REPLIED)
+ sc->sc_state = VIO9P_S_CONSUMING;
+
+ if (error != 0)
+ goto out;
+
+ error = virtio_dequeue(vsc, vq, &slot, &len);
+ if (error != 0) {
+ log(LOG_ERR, "%s: virtio_dequeue failed: %d\n",
+ device_xname(sc->sc_dev), error);
+ goto out;
+ }
+ DLOG("len=%d", len);
+ sc->sc_buf_rx_len = len;
+ sc->sc_buf_rx_offset = 0;
+ bus_dmamap_sync(virtio_dmat(vsc), sc->sc_dmamap_tx, 0, VIO9P_MAX_REQLEN,
+ BUS_DMASYNC_POSTWRITE);
+ bus_dmamap_sync(virtio_dmat(vsc), sc->sc_dmamap_rx, 0, VIO9P_MAX_REQLEN,
+ BUS_DMASYNC_POSTREAD);
+ virtio_dequeue_commit(vsc, vq, slot);
+#ifdef VIO9P_DUMP
+ int i;
+ log(LOG_DEBUG, "%s: buf: ", __func__);
+ for (i = 0; i < len; i++) {
+ log(LOG_DEBUG, "%c", (char)sc->sc_buf_rx[i]);
+ }
+ log(LOG_DEBUG, "\n");
+#endif
+
+consume:
+ DLOG("uio_resid=%lu", uio->uio_resid);
+ if (len < uio->uio_resid) {
+ error = EINVAL;
+ goto out;
+ }
+ len = uio->uio_resid;
+ error = uiomove(sc->sc_buf_rx + sc->sc_buf_rx_offset, len, uio);
+ if (error != 0)
+ goto out;
+
+ sc->sc_buf_rx_offset += len;
+ if (sc->sc_buf_rx_offset == sc->sc_buf_rx_len) {
+ sc->sc_buf_rx_len = 0;
+ sc->sc_buf_rx_offset = 0;
+
+ sc->sc_state = VIO9P_S_INIT;
+ selnotify(&sc->sc_sel, 0, 1);
+ }
+
+out:
+ mutex_exit(&sc->sc_lock);
+ return error;
+}
+
+static int
+vio9p_write(struct file *fp, off_t *offp, struct uio *uio,
+ kauth_cred_t cred, int flags)
+{
+ struct vio9p_softc *sc = fp->f_data;
+ struct virtio_softc *vsc = sc->sc_virtio;
+ struct virtqueue *vq = &sc->sc_vq[0];
+ int error, slot;
+ size_t len;
+
+ DLOG("enter");
+
+ mutex_enter(&sc->sc_lock);
+
+ if (sc->sc_state != VIO9P_S_INIT) {
+ DLOG("already requesting");
+ error = EAGAIN;
+ goto out;
+ }
+
+ if (uio->uio_resid == 0) {
+ error = 0;
+ goto out;
+ }
+
+ if (uio->uio_resid > VIO9P_MAX_REQLEN) {
+ error = EINVAL;
+ goto out;
+ }
+
+ len = uio->uio_resid;
+ error = uiomove(sc->sc_buf_tx, len, uio);
+ if (error != 0)
+ goto out;
+
+ DLOG("len=%lu", len);
+#ifdef VIO9P_DUMP
+ int i;
+ log(LOG_DEBUG, "%s: buf: ", __func__);
+ for (i = 0; i < len; i++) {
+ log(LOG_DEBUG, "%c", (char)sc->sc_buf_tx[i]);
+ }
+ log(LOG_DEBUG, "\n");
+#endif
+
+ error = virtio_enqueue_prep(vsc, vq, &slot);
+ if (error != 0) {
+ log(LOG_ERR, "%s: virtio_enqueue_prep failed\n",
+ device_xname(sc->sc_dev));
+ goto out;
+ }
+ DLOG("slot=%d", slot);
+ error = virtio_enqueue_reserve(vsc, vq, slot,
+ sc->sc_dmamap_tx->dm_nsegs + sc->sc_dmamap_rx->dm_nsegs);
+ if (error != 0) {
+ log(LOG_ERR, "%s: virtio_enqueue_reserve failed\n",
+ device_xname(sc->sc_dev));
+ goto out;
+ }
+
+ /* Tx */
+ bus_dmamap_sync(virtio_dmat(vsc), sc->sc_dmamap_tx, 0,
+ len, BUS_DMASYNC_PREWRITE);
+ virtio_enqueue(vsc, vq, slot, sc->sc_dmamap_tx, true);
+ /* Rx */
+ bus_dmamap_sync(virtio_dmat(vsc), sc->sc_dmamap_rx, 0,
+ VIO9P_MAX_REQLEN, BUS_DMASYNC_PREREAD);
+ virtio_enqueue(vsc, vq, slot, sc->sc_dmamap_rx, false);
+ virtio_enqueue_commit(vsc, vq, slot, true);
+
+ sc->sc_state = VIO9P_S_REQUESTING;
+out:
+ mutex_exit(&sc->sc_lock);
+ return error;
+}
+
+static int
+vio9p_close(struct file *fp)
+{
+ struct vio9p_softc *sc = fp->f_data;
+
+ KASSERT(ISSET(sc->sc_flags, VIO9P_INUSE));
+ sc->sc_flags &= ~VIO9P_INUSE;
+
+ return 0;
+}
+
+static void
+filt_vio9p_detach(struct knote *kn)
+{
+ struct vio9p_softc *sc = kn->kn_hook;
+
+ mutex_enter(&sc->sc_lock);
+ SLIST_REMOVE(&sc->sc_sel.sel_klist, kn, knote, kn_selnext);
+ mutex_exit(&sc->sc_lock);
+}
+
+static int
+filt_vio9p_read(struct knote *kn, long hint)
+{
+ struct vio9p_softc *sc = kn->kn_hook;
+ int rv;
+
+ kn->kn_data = sc->sc_buf_rx_len;
+ /* XXX need sc_lock? */
+ rv = (kn->kn_data > 0) || sc->sc_state != VIO9P_S_INIT;
+
+ return rv;
+}
+
+static const struct filterops vio9p_read_filtops = {
+ .f_isfd = 1,
+ .f_attach = NULL,
+ .f_detach = filt_vio9p_detach,
+ .f_event = filt_vio9p_read,
+};
+
+static int
+filt_vio9p_write(struct knote *kn, long hint)
+{
+ struct vio9p_softc *sc = kn->kn_hook;
+
+ /* XXX need sc_lock? */
+ return sc->sc_state == VIO9P_S_INIT;
+}
+
+static const struct filterops vio9p_write_filtops = {
+ .f_isfd = 1,
+ .f_attach = NULL,
+ .f_detach = filt_vio9p_detach,
+ .f_event = filt_vio9p_write,
+};
+
+static int
+vio9p_kqfilter(struct file *fp, struct knote *kn)
+{
+ struct vio9p_softc *sc = fp->f_data;
+ struct klist *klist;
+
+ mutex_enter(&sc->sc_lock);
+ switch (kn->kn_filter) {
+ case EVFILT_READ:
+ klist = &sc->sc_sel.sel_klist;
+ kn->kn_fop = &vio9p_read_filtops;
+ break;
+
+ case EVFILT_WRITE:
+ klist = &sc->sc_sel.sel_klist;
+ kn->kn_fop = &vio9p_write_filtops;
+ break;
+
+ default:
+ mutex_exit(&sc->sc_lock);
+ log(LOG_ERR, "%s: kn_filter=%u\n", __func__, kn->kn_filter);
+ return EINVAL;
+ }
+
+ kn->kn_hook = sc;
+
+ SLIST_INSERT_HEAD(klist, kn, kn_selnext);
+ mutex_exit(&sc->sc_lock);
+
+ return 0;
+}
+
+CFATTACH_DECL_NEW(vio9p, sizeof(struct vio9p_softc),
+ vio9p_match, vio9p_attach, NULL, NULL);
+
+static int
+vio9p_match(device_t parent, cfdata_t match, void *aux)
+{
+ struct virtio_attach_args *va = aux;
+
+ if (va->sc_childdevid == PCI_PRODUCT_VIRTIO_9P)
+ return 1;
+
+ return 0;
+}
+
+static void
+vio9p_attach(device_t parent, device_t self, void *aux)
+{
+ struct vio9p_softc *sc = device_private(self);
+ struct virtio_softc *vsc = device_private(parent);
+ int error;
+
+ if (virtio_child(vsc) != NULL) {
+ aprint_normal(": child already attached for %s; "
+ "something wrong...\n", device_xname(parent));
+ return;
+ }
+
+ sc->sc_dev = self;
+ sc->sc_virtio = vsc;
+
+ virtio_child_attach_start(vsc, self, IPL_VM, NULL,
+ NULL, virtio_vq_intr,
+ VIRTIO_F_PCI_INTR_MPSAFE | VIRTIO_F_PCI_INTR_SOFTINT, 0,
+ VIO9P_FLAG_BITS);
+
+ error = virtio_alloc_vq(vsc, &sc->sc_vq[0], 0, VIO9P_MAX_REQLEN,
+ VIO9P_N_SEGMENTS * 2, "vio9p");
+ if (error != 0)
+ goto err_none;
+
+ sc->sc_vq[0].vq_done = vio9p_request_done;
+
+ virtio_child_attach_set_vqs(vsc, sc->sc_vq, 1);
+
+ sc->sc_buf_tx = kmem_alloc(VIO9P_MAX_REQLEN, KM_SLEEP);
+ sc->sc_buf_rx = kmem_alloc(VIO9P_MAX_REQLEN, KM_SLEEP);
+
+ error = bus_dmamap_create(virtio_dmat(vsc), VIO9P_MAX_REQLEN,
+ VIO9P_N_SEGMENTS, VIO9P_SEGSIZE, 0, BUS_DMA_WAITOK, &sc->sc_dmamap_tx);
+ if (error != 0) {
+ aprint_error_dev(sc->sc_dev, "bus_dmamap_create failed: %d\n",
+ error);
+ goto err_vq;
+ }
+ error = bus_dmamap_create(virtio_dmat(vsc), VIO9P_MAX_REQLEN,
+ VIO9P_N_SEGMENTS, VIO9P_SEGSIZE, 0, BUS_DMA_WAITOK, &sc->sc_dmamap_rx);
+ if (error != 0) {
+ aprint_error_dev(sc->sc_dev, "bus_dmamap_create failed: %d\n",
+ error);
+ goto err_vq;
+ }
+
+ error = bus_dmamap_load(virtio_dmat(vsc), sc->sc_dmamap_tx,
+ sc->sc_buf_tx, VIO9P_MAX_REQLEN, NULL, BUS_DMA_WAITOK | BUS_DMA_WRITE);
+ if (error != 0) {
+ aprint_error_dev(sc->sc_dev, "bus_dmamap_load failed: %d\n",
+ error);
+ goto err_dmamap;
+ }
+ error = bus_dmamap_load(virtio_dmat(vsc), sc->sc_dmamap_rx,
+ sc->sc_buf_rx, VIO9P_MAX_REQLEN, NULL, BUS_DMA_WAITOK | BUS_DMA_READ);
+ if (error != 0) {
+ aprint_error_dev(sc->sc_dev, "bus_dmamap_load failed: %d\n",
+ error);
+ goto err_dmamap;
+ }
+
+ sc->sc_state = VIO9P_S_INIT;
+ mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_NONE);
+ cv_init(&sc->sc_wait, "vio9p");
+
+ vio9p_read_config(sc);
+ aprint_normal_dev(self, "tagged as %s\n", sc->sc_tag);
+
+ error = virtio_child_attach_finish(vsc);
+ if (error != 0)
+ goto err_mutex;
+
+ return;
+
+err_mutex:
+ cv_destroy(&sc->sc_wait);
+ mutex_destroy(&sc->sc_lock);
+err_dmamap:
+ bus_dmamap_destroy(virtio_dmat(vsc), sc->sc_dmamap_tx);
+ bus_dmamap_destroy(virtio_dmat(vsc), sc->sc_dmamap_rx);
+err_vq:
+ virtio_free_vq(vsc, &sc->sc_vq[0]);
+err_none:
+ virtio_child_attach_failed(vsc);
+ return;
+}
+
+static void
+vio9p_read_config(struct vio9p_softc *sc)
+{
+ device_t dev = sc->sc_dev;
+ uint8_t reg;
+ int i;
+
+ /* these values are explicitly specified as little-endian */
+ reg = virtio_read_device_config_2(sc->sc_virtio, VIO9P_CONFIG_TAG_LEN);
+ sc->sc_taglen = le16toh(reg);
+
+ if (sc->sc_taglen > P9_MAX_TAG_LEN) {
+ aprint_error_dev(dev, "warning: tag is trimmed from %u to %u\n",
+ sc->sc_taglen, P9_MAX_TAG_LEN);
+ sc->sc_taglen = P9_MAX_TAG_LEN;
+ }
+
+ for (i = 0; i < sc->sc_taglen; i++) {
+ reg = virtio_read_device_config_1(sc->sc_virtio,
+ VIO9P_CONFIG_TAG + i);
+ sc->sc_tag[i] = reg;
+ }
+ sc->sc_tag[i] = '\0';
+}
+
+static int
+vio9p_request_done(struct virtqueue *vq)
+{
+ struct virtio_softc *vsc = vq->vq_owner;
+ struct vio9p_softc *sc = device_private(virtio_child(vsc));
+
+ DLOG("enter");
+
+ mutex_enter(&sc->sc_lock);
+ sc->sc_state = VIO9P_S_REPLIED;
+ cv_broadcast(&sc->sc_wait);
+ selnotify(&sc->sc_sel, 0, 1);
+ mutex_exit(&sc->sc_lock);
+
+ return 1;
+}
+
+MODULE(MODULE_CLASS_DRIVER, vio9p, "virtio");
+
+#ifdef _MODULE
+#include "ioconf.c"
+#endif
+
+static int
+vio9p_modcmd(modcmd_t cmd, void *opaque)
+{
+#ifdef _MODULE
+ devmajor_t bmajor = NODEVMAJOR, cmajor = NODEVMAJOR;
+#endif
+ int error = 0;
+
+#ifdef _MODULE
+ switch (cmd) {
+ case MODULE_CMD_INIT:
+ error = config_init_component(cfdriver_ioconf_vio9p,
+ cfattach_ioconf_vio9p, cfdata_ioconf_vio9p);
+ devsw_attach(vio9p_cd.cd_name, NULL, &bmajor,
+ &vio9p_cdevsw, &cmajor);
+ break;
+ case MODULE_CMD_FINI:
+ error = config_fini_component(cfdriver_ioconf_vio9p,
+ cfattach_ioconf_vio9p, cfdata_ioconf_vio9p);
+ break;
+ default:
+ error = ENOTTY;
+ break;
+ }
+#endif
+
+ return error;
+}
Index: src/sys/modules/vio9p/Makefile
diff -u /dev/null src/sys/modules/vio9p/Makefile:1.1
--- /dev/null Mon Oct 28 02:56:41 2019
+++ src/sys/modules/vio9p/Makefile Mon Oct 28 02:56:40 2019
@@ -0,0 +1,12 @@
+# $NetBSD: Makefile,v 1.1 2019/10/28 02:56:40 ozaki-r Exp $
+
+.include "../Makefile.inc"
+
+.PATH: ${S}/dev/pci
+
+KMOD= vio9p
+IOCONF= vio9p.ioconf
+
+SRCS+= vio9p.c
+
+.include <bsd.kmodule.mk>
Index: src/sys/modules/vio9p/vio9p.ioconf
diff -u /dev/null src/sys/modules/vio9p/vio9p.ioconf:1.1
--- /dev/null Mon Oct 28 02:56:41 2019
+++ src/sys/modules/vio9p/vio9p.ioconf Mon Oct 28 02:56:40 2019
@@ -0,0 +1,10 @@
+# $NetBSD: vio9p.ioconf,v 1.1 2019/10/28 02:56:40 ozaki-r Exp $
+
+ioconf vio9p
+
+include "conf/files"
+include "dev/pci/files.pci"
+
+pseudo-root virtio*
+
+vio9p* at virtio?
