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c80276b420
qemu/hw/input/virtio-input.c
Gerd Hoffmann c80276b420 input: add trace events for full queues 
It isn't unusual to happen, for example during reboot when the guest
doesn't reveice events for a while.  So better don't flood stderr
with alarming messages.  Turn them into tracepoints instead so they
can be enabled in case they are needed for trouble-shooting.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 1466675495-28797-1-git-send-email-kraxel@redhat.com
2016-07-12 09:25:28 +02:00

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/*
* 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 "qapi/error.h"
#include "qemu/iov.h"
#include "trace.h"
#include "hw/qdev.h"
#include "hw/virtio/virtio.h"
#include "hw/virtio/virtio-input.h"
#include "standard-headers/linux/input.h"
#define VIRTIO_INPUT_VM_VERSION 1
/* ----------------------------------------------------------------- */
void virtio_input_send(VirtIOInput *vinput, virtio_input_event *event)
{
VirtQueueElement *elem;
unsigned have, need;
int i, len;
if (!vinput->active) {
return;
}
/* queue up events ... */
if (vinput->qindex == vinput->qsize) {
vinput->qsize++;
vinput->queue = realloc(vinput->queue, vinput->qsize *
sizeof(virtio_input_event));
}
vinput->queue[vinput->qindex++] = *event;
/* ... until we see a report sync ... */
if (event->type != cpu_to_le16(EV_SYN) ||
event->code != cpu_to_le16(SYN_REPORT)) {
return;
}
/* ... then check available space ... */
need = sizeof(virtio_input_event) * vinput->qindex;
virtqueue_get_avail_bytes(vinput->evt, &have, NULL, need, 0);
if (have < need) {
vinput->qindex = 0;
trace_virtio_input_queue_full();
return;
}
/* ... and finally pass them to the guest */
for (i = 0; i < vinput->qindex; i++) {
elem = virtqueue_pop(vinput->evt, sizeof(VirtQueueElement));
if (!elem) {
/* should not happen, we've checked for space beforehand */
fprintf(stderr, "%s: Huh? No vq elem available ...\n", __func__);
return;
}
len = iov_from_buf(elem->in_sg, elem->in_num,
0, vinput->queue+i, sizeof(virtio_input_event));
virtqueue_push(vinput->evt, elem, len);
g_free(elem);
}
virtio_notify(VIRTIO_DEVICE(vinput), vinput->evt);
vinput->qindex = 0;
}
static void virtio_input_handle_evt(VirtIODevice *vdev, VirtQueue *vq)
{
/* nothing */
}
static void virtio_input_handle_sts(VirtIODevice *vdev, VirtQueue *vq)
{
VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(vdev);
VirtIOInput *vinput = VIRTIO_INPUT(vdev);
virtio_input_event event;
VirtQueueElement *elem;
int len;
for (;;) {
elem = virtqueue_pop(vinput->sts, sizeof(VirtQueueElement));
if (!elem) {
break;
}
memset(&event, 0, sizeof(event));
len = iov_to_buf(elem->out_sg, elem->out_num,
0, &event, sizeof(event));
if (vic->handle_status) {
vic->handle_status(vinput, &event);
}
virtqueue_push(vinput->sts, elem, len);
g_free(elem);
}
virtio_notify(vdev, vinput->sts);
}
virtio_input_config *virtio_input_find_config(VirtIOInput *vinput,
uint8_t select,
uint8_t subsel)
{
VirtIOInputConfig *cfg;
QTAILQ_FOREACH(cfg, &vinput->cfg_list, node) {
if (select == cfg->config.select &&
subsel == cfg->config.subsel) {
return &cfg->config;
}
}
return NULL;
}
void virtio_input_add_config(VirtIOInput *vinput,
virtio_input_config *config)
{
VirtIOInputConfig *cfg;
if (virtio_input_find_config(vinput, config->select, config->subsel)) {
/* should not happen */
fprintf(stderr, "%s: duplicate config: %d/%d\n",
__func__, config->select, config->subsel);
abort();
}
cfg = g_new0(VirtIOInputConfig, 1);
cfg->config = *config;
QTAILQ_INSERT_TAIL(&vinput->cfg_list, cfg, node);
}
void virtio_input_init_config(VirtIOInput *vinput,
virtio_input_config *config)
{
int i = 0;
QTAILQ_INIT(&vinput->cfg_list);
while (config[i].select) {
virtio_input_add_config(vinput, config + i);
i++;
}
}
void virtio_input_idstr_config(VirtIOInput *vinput,
uint8_t select, const char *string)
{
virtio_input_config id;
if (!string) {
return;
}
memset(&id, 0, sizeof(id));
id.select = select;
id.size = snprintf(id.u.string, sizeof(id.u.string), "%s", string);
virtio_input_add_config(vinput, &id);
}
static void virtio_input_get_config(VirtIODevice *vdev, uint8_t *config_data)
{
VirtIOInput *vinput = VIRTIO_INPUT(vdev);
virtio_input_config *config;
config = virtio_input_find_config(vinput, vinput->cfg_select,
vinput->cfg_subsel);
if (config) {
memcpy(config_data, config, vinput->cfg_size);
} else {
memset(config_data, 0, vinput->cfg_size);
}
}
static void virtio_input_set_config(VirtIODevice *vdev,
const uint8_t *config_data)
{
VirtIOInput *vinput = VIRTIO_INPUT(vdev);
virtio_input_config *config = (virtio_input_config *)config_data;
vinput->cfg_select = config->select;
vinput->cfg_subsel = config->subsel;
virtio_notify_config(vdev);
}
static uint64_t virtio_input_get_features(VirtIODevice *vdev, uint64_t f,
Error **errp)
{
return f;
}
static void virtio_input_set_status(VirtIODevice *vdev, uint8_t val)
{
VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(vdev);
VirtIOInput *vinput = VIRTIO_INPUT(vdev);
if (val & VIRTIO_CONFIG_S_DRIVER_OK) {
if (!vinput->active) {
vinput->active = true;
if (vic->change_active) {
vic->change_active(vinput);
}
}
}
}
static void virtio_input_reset(VirtIODevice *vdev)
{
VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(vdev);
VirtIOInput *vinput = VIRTIO_INPUT(vdev);
if (vinput->active) {
vinput->active = false;
if (vic->change_active) {
vic->change_active(vinput);
}
}
}
static void virtio_input_save(QEMUFile *f, void *opaque)
{
VirtIOInput *vinput = opaque;
VirtIODevice *vdev = VIRTIO_DEVICE(vinput);
virtio_save(vdev, f);
}
static int virtio_input_load(QEMUFile *f, void *opaque, int version_id)
{
VirtIOInput *vinput = opaque;
VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(vinput);
VirtIODevice *vdev = VIRTIO_DEVICE(vinput);
int ret;
if (version_id != VIRTIO_INPUT_VM_VERSION) {
return -EINVAL;
}
ret = virtio_load(vdev, f, version_id);
if (ret) {
return ret;
}
/* post_load() */
vinput->active = vdev->status & VIRTIO_CONFIG_S_DRIVER_OK;
if (vic->change_active) {
vic->change_active(vinput);
}
return 0;
}
static void virtio_input_device_realize(DeviceState *dev, Error **errp)
{
VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(dev);
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VirtIOInput *vinput = VIRTIO_INPUT(dev);
VirtIOInputConfig *cfg;
Error *local_err = NULL;
if (vic->realize) {
vic->realize(dev, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
}
virtio_input_idstr_config(vinput, VIRTIO_INPUT_CFG_ID_SERIAL,
vinput->serial);
QTAILQ_FOREACH(cfg, &vinput->cfg_list, node) {
if (vinput->cfg_size < cfg->config.size) {
vinput->cfg_size = cfg->config.size;
}
}
vinput->cfg_size += 8;
assert(vinput->cfg_size <= sizeof(virtio_input_config));
virtio_init(vdev, "virtio-input", VIRTIO_ID_INPUT,
vinput->cfg_size);
vinput->evt = virtio_add_queue(vdev, 64, virtio_input_handle_evt);
vinput->sts = virtio_add_queue(vdev, 64, virtio_input_handle_sts);
register_savevm(dev, "virtio-input", -1, VIRTIO_INPUT_VM_VERSION,
virtio_input_save, virtio_input_load, vinput);
}
static void virtio_input_device_unrealize(DeviceState *dev, Error **errp)
{
VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(dev);
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VirtIOInput *vinput = VIRTIO_INPUT(dev);
Error *local_err = NULL;
unregister_savevm(dev, "virtio-input", vinput);
if (vic->unrealize) {
vic->unrealize(dev, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
}
virtio_cleanup(vdev);
}
static Property virtio_input_properties[] = {
DEFINE_PROP_STRING("serial", VirtIOInput, serial),
DEFINE_PROP_END_OF_LIST(),
};
static void virtio_input_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
dc->props = virtio_input_properties;
set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
vdc->realize = virtio_input_device_realize;
vdc->unrealize = virtio_input_device_unrealize;
vdc->get_config = virtio_input_get_config;
vdc->set_config = virtio_input_set_config;
vdc->get_features = virtio_input_get_features;
vdc->set_status = virtio_input_set_status;
vdc->reset = virtio_input_reset;
}
static const TypeInfo virtio_input_info = {
.name = TYPE_VIRTIO_INPUT,
.parent = TYPE_VIRTIO_DEVICE,
.instance_size = sizeof(VirtIOInput),
.class_size = sizeof(VirtIOInputClass),
.class_init = virtio_input_class_init,
.abstract = true,
};
/* ----------------------------------------------------------------- */
static void virtio_register_types(void)
{
type_register_static(&virtio_input_info);
}
type_init(virtio_register_types)
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