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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>
tags/v4.1.0-rc0
Marc-André Lureau 3 months ago
parent
commit
06914c97d3
5 changed files with 407 additions and 0 deletions
  1. 1
    0
      MAINTAINERS
  2. 11
    0
      Makefile
  3. 1
    0
      Makefile.objs
  4. 1
    0
      contrib/vhost-user-input/Makefile.objs
  5. 393
    0
      contrib/vhost-user-input/main.c

+ 1
- 0
MAINTAINERS View File

@@ -1532,6 +1532,7 @@ S: Maintained
F: hw/input/vhost-user-input.c
F: hw/input/virtio-input*.c
F: include/hw/virtio/virtio-input.h
F: contrib/vhost-user-input/*

virtio-serial
M: Amit Shah <amit@kernel.org>

+ 11
- 0
Makefile View File

@@ -408,6 +408,7 @@ dummy := $(call unnest-vars,, \
libvhost-user-obj-y \
vhost-user-scsi-obj-y \
vhost-user-blk-obj-y \
vhost-user-input-obj-y \
qga-vss-dll-obj-y \
block-obj-y \
block-obj-m \
@@ -618,6 +619,16 @@ rdmacm-mux$(EXESUF): LIBS += "-libumad"
rdmacm-mux$(EXESUF): $(rdmacm-mux-obj-y) $(COMMON_LDADDS)
$(call LINK, $^)

ifdef CONFIG_VHOST_USER_INPUT
ifdef CONFIG_LINUX
vhost-user-input$(EXESUF): $(vhost-user-input-obj-y) libvhost-user.a libqemuutil.a
$(call LINK, $^)

# build by default, do not install
all: vhost-user-input$(EXESUF)
endif
endif

module_block.h: $(SRC_PATH)/scripts/modules/module_block.py config-host.mak
$(call quiet-command,$(PYTHON) $< $@ \
$(addprefix $(SRC_PATH)/,$(patsubst %.mo,%.c,$(block-obj-m))), \

+ 1
- 0
Makefile.objs View File

@@ -122,6 +122,7 @@ vhost-user-scsi.o-libs := $(LIBISCSI_LIBS)
vhost-user-scsi-obj-y = contrib/vhost-user-scsi/
vhost-user-blk-obj-y = contrib/vhost-user-blk/
rdmacm-mux-obj-y = contrib/rdmacm-mux/
vhost-user-input-obj-y = contrib/vhost-user-input/

######################################################################
trace-events-subdirs =

+ 1
- 0
contrib/vhost-user-input/Makefile.objs View File

@@ -0,0 +1 @@
vhost-user-input-obj-y = main.o

+ 393
- 0
contrib/vhost-user-input/main.c View File

@@ -0,0 +1,393 @@
/*
* This work is licensed under the terms of the GNU GPL, version 2 or
* (at your option) any later version. See the COPYING file in the
* top-level directory.
*/

#include "qemu/osdep.h"

#include <glib.h>
#include <linux/input.h>

#include "qemu/iov.h"
#include "qemu/bswap.h"
#include "qemu/sockets.h"
#include "contrib/libvhost-user/libvhost-user.h"
#include "contrib/libvhost-user/libvhost-user-glib.h"
#include "standard-headers/linux/virtio_input.h"
#include "qapi/error.h"

typedef struct virtio_input_event virtio_input_event;
typedef struct virtio_input_config virtio_input_config;

typedef struct VuInput {
VugDev dev;
GSource *evsrc;
int evdevfd;
GArray *config;
virtio_input_config *sel_config;
struct {
virtio_input_event event;
VuVirtqElement *elem;
} *queue;
uint32_t qindex, qsize;
} VuInput;

static void vi_input_send(VuInput *vi, struct virtio_input_event *event)
{
VuDev *dev = &vi->dev.parent;
VuVirtq *vq = vu_get_queue(dev, 0);
VuVirtqElement *elem;
int i, len;

/* queue up events ... */
if (vi->qindex == vi->qsize) {
vi->qsize++;
vi->queue = g_realloc_n(vi->queue, vi->qsize, sizeof(vi->queue[0]));
}
vi->queue[vi->qindex++].event = *event;

/* ... until we see a report sync ... */
if (event->type != htole16(EV_SYN) ||
event->code != htole16(SYN_REPORT)) {
return;
}

/* ... then check available space ... */
for (i = 0; i < vi->qindex; i++) {
elem = vu_queue_pop(dev, vq, sizeof(VuVirtqElement));
if (!elem) {
while (--i >= 0) {
vu_queue_unpop(dev, vq, vi->queue[i].elem, 0);
}
vi->qindex = 0;
g_warning("virtio-input queue full");
return;
}
vi->queue[i].elem = elem;
}

/* ... and finally pass them to the guest */
for (i = 0; i < vi->qindex; i++) {
elem = vi->queue[i].elem;
len = iov_from_buf(elem->in_sg, elem->in_num,
0, &vi->queue[i].event, sizeof(virtio_input_event));
vu_queue_push(dev, vq, elem, len);
g_free(elem);
}

vu_queue_notify(&vi->dev.parent, vq);
vi->qindex = 0;
}

static void
vi_evdev_watch(VuDev *dev, int condition, void *data)
{
VuInput *vi = data;
int fd = vi->evdevfd;

g_debug("Got evdev condition %x", condition);

struct virtio_input_event virtio;
struct input_event evdev;
int rc;

for (;;) {
rc = read(fd, &evdev, sizeof(evdev));
if (rc != sizeof(evdev)) {
break;
}

g_debug("input %d %d %d", evdev.type, evdev.code, evdev.value);

virtio.type = htole16(evdev.type);
virtio.code = htole16(evdev.code);
virtio.value = htole32(evdev.value);
vi_input_send(vi, &virtio);
}
}


static void vi_handle_status(VuInput *vi, virtio_input_event *event)
{
struct input_event evdev;
int rc;

if (gettimeofday(&evdev.time, NULL)) {
perror("vi_handle_status: gettimeofday");
return;
}

evdev.type = le16toh(event->type);
evdev.code = le16toh(event->code);
evdev.value = le32toh(event->value);

rc = write(vi->evdevfd, &evdev, sizeof(evdev));
if (rc == -1) {
perror("vi_host_handle_status: write");
}
}

static void vi_handle_sts(VuDev *dev, int qidx)
{
VuInput *vi = container_of(dev, VuInput, dev.parent);
VuVirtq *vq = vu_get_queue(dev, qidx);
virtio_input_event event;
VuVirtqElement *elem;
int len;

g_debug("%s", G_STRFUNC);

for (;;) {
elem = vu_queue_pop(dev, vq, sizeof(VuVirtqElement));
if (!elem) {
break;
}

memset(&event, 0, sizeof(event));
len = iov_to_buf(elem->out_sg, elem->out_num,
0, &event, sizeof(event));
vi_handle_status(vi, &event);
vu_queue_push(dev, vq, elem, len);
g_free(elem);
}

vu_queue_notify(&vi->dev.parent, vq);
}

static void
vi_panic(VuDev *dev, const char *msg)
{
g_critical("%s\n", msg);
exit(EXIT_FAILURE);
}

static void
vi_queue_set_started(VuDev *dev, int qidx, bool started)
{
VuInput *vi = container_of(dev, VuInput, dev.parent);
VuVirtq *vq = vu_get_queue(dev, qidx);

g_debug("queue started %d:%d", qidx, started);

if (qidx == 1) {
vu_set_queue_handler(dev, vq, started ? vi_handle_sts : NULL);
}

started = vu_queue_started(dev, vu_get_queue(dev, 0)) &&
vu_queue_started(dev, vu_get_queue(dev, 1));

if (started && !vi->evsrc) {
vi->evsrc = vug_source_new(&vi->dev, vi->evdevfd,
G_IO_IN, vi_evdev_watch, vi);
}

if (!started && vi->evsrc) {
g_source_destroy(vi->evsrc);
vi->evsrc = NULL;
}
}

static virtio_input_config *
vi_find_config(VuInput *vi, uint8_t select, uint8_t subsel)
{
virtio_input_config *cfg;
int i;

for (i = 0; i < vi->config->len; i++) {
cfg = &g_array_index(vi->config, virtio_input_config, i);
if (select == cfg->select && subsel == cfg->subsel) {
return cfg;
}
}

return NULL;
}

static int vi_get_config(VuDev *dev, uint8_t *config, uint32_t len)
{
VuInput *vi = container_of(dev, VuInput, dev.parent);

g_return_val_if_fail(len <= sizeof(*vi->sel_config), -1);

if (vi->sel_config) {
memcpy(config, vi->sel_config, len);
} else {
memset(config, 0, len);
}

return 0;
}

static int vi_set_config(VuDev *dev, const uint8_t *data,
uint32_t offset, uint32_t size,
uint32_t flags)
{
VuInput *vi = container_of(dev, VuInput, dev.parent);
virtio_input_config *config = (virtio_input_config *)data;

vi->sel_config = vi_find_config(vi, config->select, config->subsel);

return 0;
}

static const VuDevIface vuiface = {
.queue_set_started = vi_queue_set_started,
.get_config = vi_get_config,
.set_config = vi_set_config,
};

static void
vi_bits_config(VuInput *vi, int type, int count)
{
virtio_input_config bits;
int rc, i, size = 0;

memset(&bits, 0, sizeof(bits));
rc = ioctl(vi->evdevfd, EVIOCGBIT(type, count / 8), bits.u.bitmap);
if (rc < 0) {
return;
}

for (i = 0; i < count / 8; i++) {
if (bits.u.bitmap[i]) {
size = i + 1;
}
}
if (size == 0) {
return;
}

bits.select = VIRTIO_INPUT_CFG_EV_BITS;
bits.subsel = type;
bits.size = size;
g_array_append_val(vi->config, bits);
}

static char *opt_evdev;
static int opt_fdnum = -1;
static char *opt_socket_path;
static gboolean opt_nograb;
static gboolean opt_print_caps;

static GOptionEntry entries[] = {
{ "print-capabilities", 'c', 0, G_OPTION_ARG_NONE, &opt_print_caps,
"Print capabilities", NULL },
{ "no-grab", 'n', 0, G_OPTION_ARG_NONE, &opt_nograb,
"Don't grab device", NULL },
{ "fd", 'f', 0, G_OPTION_ARG_INT, &opt_fdnum,
"Use inherited fd socket", "FDNUM" },
{ "socket-path", 's', 0, G_OPTION_ARG_FILENAME, &opt_socket_path,
"Use UNIX socket path", "PATH" },
{ "evdev-path", 'p', 0, G_OPTION_ARG_FILENAME, &opt_evdev,
"evdev input device path", "PATH" },
{ NULL, }
};

int
main(int argc, char *argv[])
{
GMainLoop *loop = NULL;
VuInput vi = { 0, };
int rc, ver, fd;
virtio_input_config id;
struct input_id ids;
GError *error = NULL;
GOptionContext *context;

context = g_option_context_new(NULL);
g_option_context_add_main_entries(context, entries, NULL);
if (!g_option_context_parse(context, &argc, &argv, &error)) {
g_printerr("Option parsing failed: %s\n", error->message);
exit(EXIT_FAILURE);
}
if (opt_print_caps) {
g_print("{\n");
g_print(" \"type\": \"input\",\n");
g_print(" \"features\": [\n");
g_print(" \"evdev-path\",\n");
g_print(" \"no-grab\"\n");
g_print(" ]\n");
g_print("}\n");
exit(EXIT_SUCCESS);
}
if (!opt_evdev) {
g_printerr("Please specify an evdev path\n");
exit(EXIT_FAILURE);
}
if ((!!opt_socket_path + (opt_fdnum != -1)) != 1) {
g_printerr("Please specify either --fd or --socket-path\n");
exit(EXIT_FAILURE);
}

vi.evdevfd = open(opt_evdev, O_RDWR);
if (vi.evdevfd < 0) {
g_printerr("Failed to open evdev: %s\n", g_strerror(errno));
exit(EXIT_FAILURE);
}

rc = ioctl(vi.evdevfd, EVIOCGVERSION, &ver);
if (rc < 0) {
g_printerr("%s: is not an evdev device\n", argv[1]);
exit(EXIT_FAILURE);
}

if (!opt_nograb) {
rc = ioctl(vi.evdevfd, EVIOCGRAB, 1);
if (rc < 0) {
g_printerr("Failed to grab device\n");
exit(EXIT_FAILURE);
}
}

vi.config = g_array_new(false, false, sizeof(virtio_input_config));
memset(&id, 0, sizeof(id));
ioctl(vi.evdevfd, EVIOCGNAME(sizeof(id.u.string) - 1), id.u.string);
id.select = VIRTIO_INPUT_CFG_ID_NAME;
id.size = strlen(id.u.string);
g_array_append_val(vi.config, id);

if (ioctl(vi.evdevfd, EVIOCGID, &ids) == 0) {
memset(&id, 0, sizeof(id));
id.select = VIRTIO_INPUT_CFG_ID_DEVIDS;
id.size = sizeof(struct virtio_input_devids);
id.u.ids.bustype = cpu_to_le16(ids.bustype);
id.u.ids.vendor = cpu_to_le16(ids.vendor);
id.u.ids.product = cpu_to_le16(ids.product);
id.u.ids.version = cpu_to_le16(ids.version);
g_array_append_val(vi.config, id);
}

vi_bits_config(&vi, EV_KEY, KEY_CNT);
vi_bits_config(&vi, EV_REL, REL_CNT);
vi_bits_config(&vi, EV_ABS, ABS_CNT);
vi_bits_config(&vi, EV_MSC, MSC_CNT);
vi_bits_config(&vi, EV_SW, SW_CNT);
g_debug("config length: %u", vi.config->len);

if (opt_socket_path) {
int lsock = unix_listen(opt_socket_path, &error_fatal);
fd = accept(lsock, NULL, NULL);
close(lsock);
} else {
fd = opt_fdnum;
}
if (fd == -1) {
g_printerr("Invalid socket");
exit(EXIT_FAILURE);
}
vug_init(&vi.dev, fd, vi_panic, &vuiface);

loop = g_main_loop_new(NULL, FALSE);
g_main_loop_run(loop);
g_main_loop_unref(loop);

vug_deinit(&vi.dev);

if (vi.evsrc) {
g_source_unref(vi.evsrc);
}
g_array_free(vi.config, TRUE);
g_free(vi.queue);
return 0;
}

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