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qemu/ui/input.c
Daniel P. Berrange 80b857f0c6 ui: normalize the 'sysrq' key into the 'print' key 
The 'sysrq' key was mistakenly added to QEMU to deal with incorrect handling
of the 'print' key in the ps2 device:

  commit f2289cb692
  Author: balrog <balrog@c046a42c-6fe2-441c-8c8c-71466251a162>
  Date:   Wed Jun 4 10:14:16 2008 +0000

    Add sysrq to key names known by "sendkey".

    Adding sysrq keycode to the table enabling running sysrq debugging in
    the guest via the monitor sendkey command, like:

    (qemu) sendkey alt-sysrq-t

    Tested on x86-64 target and Linux guest.

    Signed-off-by: Ryan Harper <ryanh@us.ibm.com>

The ps2 device is now fixed wrt modifiers and the 'print' key. Further the
handling of the 'sysrq' key has some problems of its own, documented in the
previous commit. To cleanup this mess, we convert any use of 'sysrq' into
'print' prior to dispatching the event to device models.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Message-id: 20171019142848.572-9-berrange@redhat.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2017-10-23 10:50:02 +02:00

624 lines
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#include "qemu/osdep.h"
#include "sysemu/sysemu.h"
#include "qapi-types.h"
#include "qemu/error-report.h"
#include "qmp-commands.h"
#include "trace.h"
#include "ui/input.h"
#include "ui/console.h"
#include "sysemu/replay.h"
struct QemuInputHandlerState {
DeviceState *dev;
QemuInputHandler *handler;
int id;
int events;
QemuConsole *con;
QTAILQ_ENTRY(QemuInputHandlerState) node;
};
typedef struct QemuInputEventQueue QemuInputEventQueue;
struct QemuInputEventQueue {
enum {
QEMU_INPUT_QUEUE_DELAY = 1,
QEMU_INPUT_QUEUE_EVENT,
QEMU_INPUT_QUEUE_SYNC,
} type;
QEMUTimer *timer;
uint32_t delay_ms;
QemuConsole *src;
InputEvent *evt;
QTAILQ_ENTRY(QemuInputEventQueue) node;
};
static QTAILQ_HEAD(, QemuInputHandlerState) handlers =
QTAILQ_HEAD_INITIALIZER(handlers);
static NotifierList mouse_mode_notifiers =
NOTIFIER_LIST_INITIALIZER(mouse_mode_notifiers);
static QTAILQ_HEAD(QemuInputEventQueueHead, QemuInputEventQueue) kbd_queue =
QTAILQ_HEAD_INITIALIZER(kbd_queue);
static QEMUTimer *kbd_timer;
static uint32_t kbd_default_delay_ms = 10;
static uint32_t queue_count;
static uint32_t queue_limit = 1024;
QemuInputHandlerState *qemu_input_handler_register(DeviceState *dev,
QemuInputHandler *handler)
{
QemuInputHandlerState *s = g_new0(QemuInputHandlerState, 1);
static int id = 1;
s->dev = dev;
s->handler = handler;
s->id = id++;
QTAILQ_INSERT_TAIL(&handlers, s, node);
qemu_input_check_mode_change();
return s;
}
void qemu_input_handler_activate(QemuInputHandlerState *s)
{
QTAILQ_REMOVE(&handlers, s, node);
QTAILQ_INSERT_HEAD(&handlers, s, node);
qemu_input_check_mode_change();
}
void qemu_input_handler_deactivate(QemuInputHandlerState *s)
{
QTAILQ_REMOVE(&handlers, s, node);
QTAILQ_INSERT_TAIL(&handlers, s, node);
qemu_input_check_mode_change();
}
void qemu_input_handler_unregister(QemuInputHandlerState *s)
{
QTAILQ_REMOVE(&handlers, s, node);
g_free(s);
qemu_input_check_mode_change();
}
void qemu_input_handler_bind(QemuInputHandlerState *s,
const char *device_id, int head,
Error **errp)
{
QemuConsole *con;
Error *err = NULL;
con = qemu_console_lookup_by_device_name(device_id, head, &err);
if (err) {
error_propagate(errp, err);
return;
}
s->con = con;
}
static QemuInputHandlerState*
qemu_input_find_handler(uint32_t mask, QemuConsole *con)
{
QemuInputHandlerState *s;
QTAILQ_FOREACH(s, &handlers, node) {
if (s->con == NULL || s->con != con) {
continue;
}
if (mask & s->handler->mask) {
return s;
}
}
QTAILQ_FOREACH(s, &handlers, node) {
if (s->con != NULL) {
continue;
}
if (mask & s->handler->mask) {
return s;
}
}
return NULL;
}
void qmp_input_send_event(bool has_device, const char *device,
bool has_head, int64_t head,
InputEventList *events, Error **errp)
{
InputEventList *e;
QemuConsole *con;
Error *err = NULL;
con = NULL;
if (has_device) {
if (!has_head) {
head = 0;
}
con = qemu_console_lookup_by_device_name(device, head, &err);
if (err) {
error_propagate(errp, err);
return;
}
}
if (!runstate_is_running() && !runstate_check(RUN_STATE_SUSPENDED)) {
error_setg(errp, "VM not running");
return;
}
for (e = events; e != NULL; e = e->next) {
InputEvent *event = e->value;
if (!qemu_input_find_handler(1 << event->type, con)) {
error_setg(errp, "Input handler not found for "
"event type %s",
InputEventKind_str(event->type));
return;
}
}
for (e = events; e != NULL; e = e->next) {
InputEvent *evt = e->value;
if (evt->type == INPUT_EVENT_KIND_KEY &&
evt->u.key.data->key->type == KEY_VALUE_KIND_NUMBER) {
KeyValue *key = evt->u.key.data->key;
QKeyCode code = qemu_input_key_number_to_qcode(key->u.number.data);
qemu_input_event_send_key_qcode(con, code, evt->u.key.data->down);
} else {
qemu_input_event_send(con, evt);
}
}
qemu_input_event_sync();
}
static int qemu_input_transform_invert_abs_value(int value)
{
return (int64_t)INPUT_EVENT_ABS_MAX - value + INPUT_EVENT_ABS_MIN;
}
static void qemu_input_transform_abs_rotate(InputEvent *evt)
{
InputMoveEvent *move = evt->u.abs.data;
switch (graphic_rotate) {
case 90:
if (move->axis == INPUT_AXIS_X) {
move->axis = INPUT_AXIS_Y;
} else if (move->axis == INPUT_AXIS_Y) {
move->axis = INPUT_AXIS_X;
move->value = qemu_input_transform_invert_abs_value(move->value);
}
break;
case 180:
move->value = qemu_input_transform_invert_abs_value(move->value);
break;
case 270:
if (move->axis == INPUT_AXIS_X) {
move->axis = INPUT_AXIS_Y;
move->value = qemu_input_transform_invert_abs_value(move->value);
} else if (move->axis == INPUT_AXIS_Y) {
move->axis = INPUT_AXIS_X;
}
break;
}
}
static void qemu_input_event_trace(QemuConsole *src, InputEvent *evt)
{
const char *name;
int qcode, idx = -1;
InputKeyEvent *key;
InputBtnEvent *btn;
InputMoveEvent *move;
if (src) {
idx = qemu_console_get_index(src);
}
switch (evt->type) {
case INPUT_EVENT_KIND_KEY:
key = evt->u.key.data;
switch (key->key->type) {
case KEY_VALUE_KIND_NUMBER:
qcode = qemu_input_key_number_to_qcode(key->key->u.number.data);
name = QKeyCode_str(qcode);
trace_input_event_key_number(idx, key->key->u.number.data,
name, key->down);
break;
case KEY_VALUE_KIND_QCODE:
name = QKeyCode_str(key->key->u.qcode.data);
trace_input_event_key_qcode(idx, name, key->down);
break;
case KEY_VALUE_KIND__MAX:
/* keep gcc happy */
break;
}
break;
case INPUT_EVENT_KIND_BTN:
btn = evt->u.btn.data;
name = InputButton_str(btn->button);
trace_input_event_btn(idx, name, btn->down);
break;
case INPUT_EVENT_KIND_REL:
move = evt->u.rel.data;
name = InputAxis_str(move->axis);
trace_input_event_rel(idx, name, move->value);
break;
case INPUT_EVENT_KIND_ABS:
move = evt->u.abs.data;
name = InputAxis_str(move->axis);
trace_input_event_abs(idx, name, move->value);
break;
case INPUT_EVENT_KIND__MAX:
/* keep gcc happy */
break;
}
}
static void qemu_input_queue_process(void *opaque)
{
struct QemuInputEventQueueHead *queue = opaque;
QemuInputEventQueue *item;
g_assert(!QTAILQ_EMPTY(queue));
item = QTAILQ_FIRST(queue);
g_assert(item->type == QEMU_INPUT_QUEUE_DELAY);
QTAILQ_REMOVE(queue, item, node);
queue_count--;
g_free(item);
while (!QTAILQ_EMPTY(queue)) {
item = QTAILQ_FIRST(queue);
switch (item->type) {
case QEMU_INPUT_QUEUE_DELAY:
timer_mod(item->timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL)
+ item->delay_ms);
return;
case QEMU_INPUT_QUEUE_EVENT:
qemu_input_event_send(item->src, item->evt);
qapi_free_InputEvent(item->evt);
break;
case QEMU_INPUT_QUEUE_SYNC:
qemu_input_event_sync();
break;
}
QTAILQ_REMOVE(queue, item, node);
queue_count--;
g_free(item);
}
}
static void qemu_input_queue_delay(struct QemuInputEventQueueHead *queue,
QEMUTimer *timer, uint32_t delay_ms)
{
QemuInputEventQueue *item = g_new0(QemuInputEventQueue, 1);
bool start_timer = QTAILQ_EMPTY(queue);
item->type = QEMU_INPUT_QUEUE_DELAY;
item->delay_ms = delay_ms;
item->timer = timer;
QTAILQ_INSERT_TAIL(queue, item, node);
queue_count++;
if (start_timer) {
timer_mod(item->timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL)
+ item->delay_ms);
}
}
static void qemu_input_queue_event(struct QemuInputEventQueueHead *queue,
QemuConsole *src, InputEvent *evt)
{
QemuInputEventQueue *item = g_new0(QemuInputEventQueue, 1);
item->type = QEMU_INPUT_QUEUE_EVENT;
item->src = src;
item->evt = evt;
QTAILQ_INSERT_TAIL(queue, item, node);
queue_count++;
}
static void qemu_input_queue_sync(struct QemuInputEventQueueHead *queue)
{
QemuInputEventQueue *item = g_new0(QemuInputEventQueue, 1);
item->type = QEMU_INPUT_QUEUE_SYNC;
QTAILQ_INSERT_TAIL(queue, item, node);
queue_count++;
}
void qemu_input_event_send_impl(QemuConsole *src, InputEvent *evt)
{
QemuInputHandlerState *s;
qemu_input_event_trace(src, evt);
/* pre processing */
if (graphic_rotate && (evt->type == INPUT_EVENT_KIND_ABS)) {
qemu_input_transform_abs_rotate(evt);
}
/* send event */
s = qemu_input_find_handler(1 << evt->type, src);
if (!s) {
return;
}
s->handler->event(s->dev, src, evt);
s->events++;
}
void qemu_input_event_send(QemuConsole *src, InputEvent *evt)
{
/* Expect all parts of QEMU to send events with QCodes exclusively.
* Key numbers are only supported as end-user input via QMP */
assert(!(evt->type == INPUT_EVENT_KIND_KEY &&
evt->u.key.data->key->type == KEY_VALUE_KIND_NUMBER));
/*
* 'sysrq' was mistakenly added to hack around the fact that
* the ps2 driver was not generating correct scancodes sequences
* when 'alt+print' was pressed. This flaw is now fixed and the
* 'sysrq' key serves no further purpose. We normalize it to
* 'print', so that downstream receivers of the event don't
* neeed to deal with this mistake
*/
if (evt->type == INPUT_EVENT_KIND_KEY &&
evt->u.key.data->key->u.qcode.data == Q_KEY_CODE_SYSRQ) {
evt->u.key.data->key->u.qcode.data = Q_KEY_CODE_PRINT;
}
if (!runstate_is_running() && !runstate_check(RUN_STATE_SUSPENDED)) {
return;
}
replay_input_event(src, evt);
}
void qemu_input_event_sync_impl(void)
{
QemuInputHandlerState *s;
trace_input_event_sync();
QTAILQ_FOREACH(s, &handlers, node) {
if (!s->events) {
continue;
}
if (s->handler->sync) {
s->handler->sync(s->dev);
}
s->events = 0;
}
}
void qemu_input_event_sync(void)
{
if (!runstate_is_running() && !runstate_check(RUN_STATE_SUSPENDED)) {
return;
}
replay_input_sync_event();
}
static InputEvent *qemu_input_event_new_key(KeyValue *key, bool down)
{
InputEvent *evt = g_new0(InputEvent, 1);
evt->u.key.data = g_new0(InputKeyEvent, 1);
evt->type = INPUT_EVENT_KIND_KEY;
evt->u.key.data->key = key;
evt->u.key.data->down = down;
return evt;
}
void qemu_input_event_send_key(QemuConsole *src, KeyValue *key, bool down)
{
InputEvent *evt;
evt = qemu_input_event_new_key(key, down);
if (QTAILQ_EMPTY(&kbd_queue)) {
qemu_input_event_send(src, evt);
qemu_input_event_sync();
qapi_free_InputEvent(evt);
} else if (queue_count < queue_limit) {
qemu_input_queue_event(&kbd_queue, src, evt);
qemu_input_queue_sync(&kbd_queue);
}
}
void qemu_input_event_send_key_number(QemuConsole *src, int num, bool down)
{
QKeyCode code = qemu_input_key_number_to_qcode(num);
qemu_input_event_send_key_qcode(src, code, down);
}
void qemu_input_event_send_key_qcode(QemuConsole *src, QKeyCode q, bool down)
{
KeyValue *key = g_new0(KeyValue, 1);
key->type = KEY_VALUE_KIND_QCODE;
key->u.qcode.data = q;
qemu_input_event_send_key(src, key, down);
}
void qemu_input_event_send_key_delay(uint32_t delay_ms)
{
if (!runstate_is_running() && !runstate_check(RUN_STATE_SUSPENDED)) {
return;
}
if (!kbd_timer) {
kbd_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL, qemu_input_queue_process,
&kbd_queue);
}
if (queue_count < queue_limit) {
qemu_input_queue_delay(&kbd_queue, kbd_timer,
delay_ms ? delay_ms : kbd_default_delay_ms);
}
}
InputEvent *qemu_input_event_new_btn(InputButton btn, bool down)
{
InputEvent *evt = g_new0(InputEvent, 1);
evt->u.btn.data = g_new0(InputBtnEvent, 1);
evt->type = INPUT_EVENT_KIND_BTN;
evt->u.btn.data->button = btn;
evt->u.btn.data->down = down;
return evt;
}
void qemu_input_queue_btn(QemuConsole *src, InputButton btn, bool down)
{
InputEvent *evt;
evt = qemu_input_event_new_btn(btn, down);
qemu_input_event_send(src, evt);
qapi_free_InputEvent(evt);
}
void qemu_input_update_buttons(QemuConsole *src, uint32_t *button_map,
uint32_t button_old, uint32_t button_new)
{
InputButton btn;
uint32_t mask;
for (btn = 0; btn < INPUT_BUTTON__MAX; btn++) {
mask = button_map[btn];
if ((button_old & mask) == (button_new & mask)) {
continue;
}
qemu_input_queue_btn(src, btn, button_new & mask);
}
}
bool qemu_input_is_absolute(void)
{
QemuInputHandlerState *s;
s = qemu_input_find_handler(INPUT_EVENT_MASK_REL | INPUT_EVENT_MASK_ABS,
NULL);
return (s != NULL) && (s->handler->mask & INPUT_EVENT_MASK_ABS);
}
int qemu_input_scale_axis(int value,
int min_in, int max_in,
int min_out, int max_out)
{
int64_t range_in = (int64_t)max_in - min_in;
int64_t range_out = (int64_t)max_out - min_out;
if (range_in < 1) {
return min_out + range_out / 2;
}
return ((int64_t)value - min_in) * range_out / range_in + min_out;
}
InputEvent *qemu_input_event_new_move(InputEventKind kind,
InputAxis axis, int value)
{
InputEvent *evt = g_new0(InputEvent, 1);
InputMoveEvent *move = g_new0(InputMoveEvent, 1);
evt->type = kind;
evt->u.rel.data = move; /* evt->u.rel is the same as evt->u.abs */
move->axis = axis;
move->value = value;
return evt;
}
void qemu_input_queue_rel(QemuConsole *src, InputAxis axis, int value)
{
InputEvent *evt;
evt = qemu_input_event_new_move(INPUT_EVENT_KIND_REL, axis, value);
qemu_input_event_send(src, evt);
qapi_free_InputEvent(evt);
}
void qemu_input_queue_abs(QemuConsole *src, InputAxis axis, int value,
int min_in, int max_in)
{
InputEvent *evt;
int scaled = qemu_input_scale_axis(value, min_in, max_in,
INPUT_EVENT_ABS_MIN,
INPUT_EVENT_ABS_MAX);
evt = qemu_input_event_new_move(INPUT_EVENT_KIND_ABS, axis, scaled);
qemu_input_event_send(src, evt);
qapi_free_InputEvent(evt);
}
void qemu_input_check_mode_change(void)
{
static int current_is_absolute;
int is_absolute;
is_absolute = qemu_input_is_absolute();
if (is_absolute != current_is_absolute) {
trace_input_mouse_mode(is_absolute);
notifier_list_notify(&mouse_mode_notifiers, NULL);
}
current_is_absolute = is_absolute;
}
void qemu_add_mouse_mode_change_notifier(Notifier *notify)
{
notifier_list_add(&mouse_mode_notifiers, notify);
}
void qemu_remove_mouse_mode_change_notifier(Notifier *notify)
{
notifier_remove(notify);
}
MouseInfoList *qmp_query_mice(Error **errp)
{
MouseInfoList *mice_list = NULL;
MouseInfoList *info;
QemuInputHandlerState *s;
bool current = true;
QTAILQ_FOREACH(s, &handlers, node) {
if (!(s->handler->mask &
(INPUT_EVENT_MASK_REL | INPUT_EVENT_MASK_ABS))) {
continue;
}
info = g_new0(MouseInfoList, 1);
info->value = g_new0(MouseInfo, 1);
info->value->index = s->id;
info->value->name = g_strdup(s->handler->name);
info->value->absolute = s->handler->mask & INPUT_EVENT_MASK_ABS;
info->value->current = current;
current = false;
info->next = mice_list;
mice_list = info;
}
return mice_list;
}
void hmp_mouse_set(Monitor *mon, const QDict *qdict)
{
QemuInputHandlerState *s;
int index = qdict_get_int(qdict, "index");
int found = 0;
QTAILQ_FOREACH(s, &handlers, node) {
if (s->id != index) {
continue;
}
if (!(s->handler->mask & (INPUT_EVENT_MASK_REL |
INPUT_EVENT_MASK_ABS))) {
error_report("Input device '%s' is not a mouse", s->handler->name);
return;
}
found = 1;
qemu_input_handler_activate(s);
break;
}
if (!found) {
error_report("Mouse at index '%d' not found", index);
}
qemu_input_check_mode_change();
}
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