contrib: add vhost-user-input
Add a vhost-user input backend example, based on virtio-input-host device. It takes an evdev path as argument, and can be associated with a vhost-user-input device via a UNIX socket: $ vhost-user-input -p /dev/input/eventX -s /tmp/vui.sock $ qemu ... -chardev socket,id=vuic,path=/tmp/vui.sock -device vhost-user-input-pci,chardev=vuic This example is intentionally not included in $TOOLS, and not installed by default. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-id: 20190514104126.6294-4-marcandre.lureau@redhat.com Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Marc-André Lureau
Gerd Hoffmann
parent
7fa9f0388c
commit
06914c97d3
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@ -1532,6 +1532,7 @@ S: Maintained
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F: hw/input/vhost-user-input.c
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F: hw/input/virtio-input*.c
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F: include/hw/virtio/virtio-input.h
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F: contrib/vhost-user-input/*
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virtio-serial
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M: Amit Shah <amit@kernel.org>
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11
Makefile
11
Makefile
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@ -408,6 +408,7 @@ dummy := $(call unnest-vars,, \
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libvhost-user-obj-y \
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vhost-user-scsi-obj-y \
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vhost-user-blk-obj-y \
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vhost-user-input-obj-y \
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qga-vss-dll-obj-y \
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block-obj-y \
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block-obj-m \
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@ -618,6 +619,16 @@ rdmacm-mux$(EXESUF): LIBS += "-libumad"
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rdmacm-mux$(EXESUF): $(rdmacm-mux-obj-y) $(COMMON_LDADDS)
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$(call LINK, $^)
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ifdef CONFIG_VHOST_USER_INPUT
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ifdef CONFIG_LINUX
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vhost-user-input$(EXESUF): $(vhost-user-input-obj-y) libvhost-user.a libqemuutil.a
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$(call LINK, $^)
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# build by default, do not install
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all: vhost-user-input$(EXESUF)
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endif
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endif
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module_block.h: $(SRC_PATH)/scripts/modules/module_block.py config-host.mak
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$(call quiet-command,$(PYTHON) $< $@ \
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$(addprefix $(SRC_PATH)/,$(patsubst %.mo,%.c,$(block-obj-m))), \
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@ -122,6 +122,7 @@ vhost-user-scsi.o-libs := $(LIBISCSI_LIBS)
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vhost-user-scsi-obj-y = contrib/vhost-user-scsi/
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vhost-user-blk-obj-y = contrib/vhost-user-blk/
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rdmacm-mux-obj-y = contrib/rdmacm-mux/
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vhost-user-input-obj-y = contrib/vhost-user-input/
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######################################################################
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trace-events-subdirs =
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@ -0,0 +1 @@
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vhost-user-input-obj-y = main.o
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@ -0,0 +1,393 @@
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/*
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* This work is licensed under the terms of the GNU GPL, version 2 or
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* (at your option) any later version. See the COPYING file in the
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* top-level directory.
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*/
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#include "qemu/osdep.h"
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#include <glib.h>
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#include <linux/input.h>
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#include "qemu/iov.h"
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#include "qemu/bswap.h"
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#include "qemu/sockets.h"
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#include "contrib/libvhost-user/libvhost-user.h"
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#include "contrib/libvhost-user/libvhost-user-glib.h"
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#include "standard-headers/linux/virtio_input.h"
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#include "qapi/error.h"
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typedef struct virtio_input_event virtio_input_event;
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typedef struct virtio_input_config virtio_input_config;
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typedef struct VuInput {
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VugDev dev;
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GSource *evsrc;
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int evdevfd;
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GArray *config;
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virtio_input_config *sel_config;
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struct {
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virtio_input_event event;
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VuVirtqElement *elem;
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} *queue;
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uint32_t qindex, qsize;
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} VuInput;
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static void vi_input_send(VuInput *vi, struct virtio_input_event *event)
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{
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VuDev *dev = &vi->dev.parent;
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VuVirtq *vq = vu_get_queue(dev, 0);
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VuVirtqElement *elem;
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int i, len;
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/* queue up events ... */
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if (vi->qindex == vi->qsize) {
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vi->qsize++;
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vi->queue = g_realloc_n(vi->queue, vi->qsize, sizeof(vi->queue[0]));
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}
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vi->queue[vi->qindex++].event = *event;
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/* ... until we see a report sync ... */
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if (event->type != htole16(EV_SYN) ||
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event->code != htole16(SYN_REPORT)) {
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return;
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}
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/* ... then check available space ... */
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for (i = 0; i < vi->qindex; i++) {
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elem = vu_queue_pop(dev, vq, sizeof(VuVirtqElement));
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if (!elem) {
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while (--i >= 0) {
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vu_queue_unpop(dev, vq, vi->queue[i].elem, 0);
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}
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vi->qindex = 0;
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g_warning("virtio-input queue full");
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return;
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}
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vi->queue[i].elem = elem;
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}
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/* ... and finally pass them to the guest */
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for (i = 0; i < vi->qindex; i++) {
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elem = vi->queue[i].elem;
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len = iov_from_buf(elem->in_sg, elem->in_num,
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0, &vi->queue[i].event, sizeof(virtio_input_event));
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vu_queue_push(dev, vq, elem, len);
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g_free(elem);
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}
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vu_queue_notify(&vi->dev.parent, vq);
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vi->qindex = 0;
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}
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static void
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vi_evdev_watch(VuDev *dev, int condition, void *data)
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{
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VuInput *vi = data;
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int fd = vi->evdevfd;
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g_debug("Got evdev condition %x", condition);
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struct virtio_input_event virtio;
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struct input_event evdev;
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int rc;
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for (;;) {
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rc = read(fd, &evdev, sizeof(evdev));
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if (rc != sizeof(evdev)) {
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break;
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}
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g_debug("input %d %d %d", evdev.type, evdev.code, evdev.value);
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virtio.type = htole16(evdev.type);
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virtio.code = htole16(evdev.code);
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virtio.value = htole32(evdev.value);
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vi_input_send(vi, &virtio);
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}
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}
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static void vi_handle_status(VuInput *vi, virtio_input_event *event)
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{
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struct input_event evdev;
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int rc;
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if (gettimeofday(&evdev.time, NULL)) {
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perror("vi_handle_status: gettimeofday");
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return;
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}
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evdev.type = le16toh(event->type);
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evdev.code = le16toh(event->code);
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evdev.value = le32toh(event->value);
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rc = write(vi->evdevfd, &evdev, sizeof(evdev));
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if (rc == -1) {
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perror("vi_host_handle_status: write");
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}
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}
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static void vi_handle_sts(VuDev *dev, int qidx)
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{
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VuInput *vi = container_of(dev, VuInput, dev.parent);
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VuVirtq *vq = vu_get_queue(dev, qidx);
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virtio_input_event event;
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VuVirtqElement *elem;
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int len;
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g_debug("%s", G_STRFUNC);
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for (;;) {
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elem = vu_queue_pop(dev, vq, sizeof(VuVirtqElement));
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if (!elem) {
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break;
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}
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memset(&event, 0, sizeof(event));
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len = iov_to_buf(elem->out_sg, elem->out_num,
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0, &event, sizeof(event));
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vi_handle_status(vi, &event);
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vu_queue_push(dev, vq, elem, len);
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g_free(elem);
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}
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vu_queue_notify(&vi->dev.parent, vq);
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}
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static void
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vi_panic(VuDev *dev, const char *msg)
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{
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g_critical("%s\n", msg);
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exit(EXIT_FAILURE);
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}
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static void
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vi_queue_set_started(VuDev *dev, int qidx, bool started)
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{
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VuInput *vi = container_of(dev, VuInput, dev.parent);
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VuVirtq *vq = vu_get_queue(dev, qidx);
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g_debug("queue started %d:%d", qidx, started);
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if (qidx == 1) {
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vu_set_queue_handler(dev, vq, started ? vi_handle_sts : NULL);
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}
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started = vu_queue_started(dev, vu_get_queue(dev, 0)) &&
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vu_queue_started(dev, vu_get_queue(dev, 1));
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if (started && !vi->evsrc) {
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vi->evsrc = vug_source_new(&vi->dev, vi->evdevfd,
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G_IO_IN, vi_evdev_watch, vi);
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}
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if (!started && vi->evsrc) {
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g_source_destroy(vi->evsrc);
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vi->evsrc = NULL;
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}
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}
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static virtio_input_config *
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vi_find_config(VuInput *vi, uint8_t select, uint8_t subsel)
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{
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virtio_input_config *cfg;
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int i;
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for (i = 0; i < vi->config->len; i++) {
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cfg = &g_array_index(vi->config, virtio_input_config, i);
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if (select == cfg->select && subsel == cfg->subsel) {
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return cfg;
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}
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}
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return NULL;
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}
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static int vi_get_config(VuDev *dev, uint8_t *config, uint32_t len)
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{
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VuInput *vi = container_of(dev, VuInput, dev.parent);
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g_return_val_if_fail(len <= sizeof(*vi->sel_config), -1);
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if (vi->sel_config) {
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memcpy(config, vi->sel_config, len);
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} else {
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memset(config, 0, len);
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}
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return 0;
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}
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static int vi_set_config(VuDev *dev, const uint8_t *data,
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uint32_t offset, uint32_t size,
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uint32_t flags)
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{
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VuInput *vi = container_of(dev, VuInput, dev.parent);
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virtio_input_config *config = (virtio_input_config *)data;
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vi->sel_config = vi_find_config(vi, config->select, config->subsel);
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return 0;
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}
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static const VuDevIface vuiface = {
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.queue_set_started = vi_queue_set_started,
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.get_config = vi_get_config,
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.set_config = vi_set_config,
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};
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static void
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vi_bits_config(VuInput *vi, int type, int count)
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{
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virtio_input_config bits;
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int rc, i, size = 0;
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memset(&bits, 0, sizeof(bits));
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rc = ioctl(vi->evdevfd, EVIOCGBIT(type, count / 8), bits.u.bitmap);
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if (rc < 0) {
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return;
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}
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for (i = 0; i < count / 8; i++) {
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if (bits.u.bitmap[i]) {
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size = i + 1;
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}
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}
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if (size == 0) {
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return;
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}
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bits.select = VIRTIO_INPUT_CFG_EV_BITS;
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bits.subsel = type;
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bits.size = size;
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g_array_append_val(vi->config, bits);
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}
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static char *opt_evdev;
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static int opt_fdnum = -1;
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static char *opt_socket_path;
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static gboolean opt_nograb;
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static gboolean opt_print_caps;
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static GOptionEntry entries[] = {
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{ "print-capabilities", 'c', 0, G_OPTION_ARG_NONE, &opt_print_caps,
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"Print capabilities", NULL },
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{ "no-grab", 'n', 0, G_OPTION_ARG_NONE, &opt_nograb,
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"Don't grab device", NULL },
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{ "fd", 'f', 0, G_OPTION_ARG_INT, &opt_fdnum,
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"Use inherited fd socket", "FDNUM" },
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{ "socket-path", 's', 0, G_OPTION_ARG_FILENAME, &opt_socket_path,
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"Use UNIX socket path", "PATH" },
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{ "evdev-path", 'p', 0, G_OPTION_ARG_FILENAME, &opt_evdev,
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"evdev input device path", "PATH" },
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{ NULL, }
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};
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int
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main(int argc, char *argv[])
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{
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GMainLoop *loop = NULL;
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VuInput vi = { 0, };
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int rc, ver, fd;
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virtio_input_config id;
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struct input_id ids;
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GError *error = NULL;
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GOptionContext *context;
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context = g_option_context_new(NULL);
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g_option_context_add_main_entries(context, entries, NULL);
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if (!g_option_context_parse(context, &argc, &argv, &error)) {
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g_printerr("Option parsing failed: %s\n", error->message);
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exit(EXIT_FAILURE);
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}
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if (opt_print_caps) {
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g_print("{\n");
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g_print(" \"type\": \"input\",\n");
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g_print(" \"features\": [\n");
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g_print(" \"evdev-path\",\n");
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g_print(" \"no-grab\"\n");
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g_print(" ]\n");
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g_print("}\n");
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exit(EXIT_SUCCESS);
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}
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if (!opt_evdev) {
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g_printerr("Please specify an evdev path\n");
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exit(EXIT_FAILURE);
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}
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if ((!!opt_socket_path + (opt_fdnum != -1)) != 1) {
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g_printerr("Please specify either --fd or --socket-path\n");
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exit(EXIT_FAILURE);
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}
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vi.evdevfd = open(opt_evdev, O_RDWR);
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if (vi.evdevfd < 0) {
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g_printerr("Failed to open evdev: %s\n", g_strerror(errno));
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exit(EXIT_FAILURE);
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}
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rc = ioctl(vi.evdevfd, EVIOCGVERSION, &ver);
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if (rc < 0) {
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g_printerr("%s: is not an evdev device\n", argv[1]);
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exit(EXIT_FAILURE);
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}
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if (!opt_nograb) {
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rc = ioctl(vi.evdevfd, EVIOCGRAB, 1);
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if (rc < 0) {
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g_printerr("Failed to grab device\n");
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exit(EXIT_FAILURE);
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}
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}
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vi.config = g_array_new(false, false, sizeof(virtio_input_config));
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memset(&id, 0, sizeof(id));
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ioctl(vi.evdevfd, EVIOCGNAME(sizeof(id.u.string) - 1), id.u.string);
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id.select = VIRTIO_INPUT_CFG_ID_NAME;
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id.size = strlen(id.u.string);
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g_array_append_val(vi.config, id);
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if (ioctl(vi.evdevfd, EVIOCGID, &ids) == 0) {
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memset(&id, 0, sizeof(id));
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id.select = VIRTIO_INPUT_CFG_ID_DEVIDS;
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id.size = sizeof(struct virtio_input_devids);
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id.u.ids.bustype = cpu_to_le16(ids.bustype);
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id.u.ids.vendor = cpu_to_le16(ids.vendor);
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id.u.ids.product = cpu_to_le16(ids.product);
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id.u.ids.version = cpu_to_le16(ids.version);
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g_array_append_val(vi.config, id);
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}
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vi_bits_config(&vi, EV_KEY, KEY_CNT);
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vi_bits_config(&vi, EV_REL, REL_CNT);
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vi_bits_config(&vi, EV_ABS, ABS_CNT);
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vi_bits_config(&vi, EV_MSC, MSC_CNT);
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vi_bits_config(&vi, EV_SW, SW_CNT);
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g_debug("config length: %u", vi.config->len);
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if (opt_socket_path) {
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int lsock = unix_listen(opt_socket_path, &error_fatal);
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fd = accept(lsock, NULL, NULL);
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close(lsock);
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} else {
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fd = opt_fdnum;
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}
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if (fd == -1) {
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g_printerr("Invalid socket");
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exit(EXIT_FAILURE);
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}
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vug_init(&vi.dev, fd, vi_panic, &vuiface);
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loop = g_main_loop_new(NULL, FALSE);
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g_main_loop_run(loop);
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g_main_loop_unref(loop);
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vug_deinit(&vi.dev);
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if (vi.evsrc) {
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g_source_unref(vi.evsrc);
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}
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g_array_free(vi.config, TRUE);
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g_free(vi.queue);
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return 0;
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}
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