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// Copyright (C) 2019 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qeglfskmseventreader_p.h"
#include "qeglfskmsdevice_p.h"
#include "qeglfskmsscreen_p.h"
#include <QSocketNotifier>
#include <QCoreApplication>
#include <QLoggingCategory>
QT_BEGIN_NAMESPACE
Q_DECLARE_LOGGING_CATEGORY(qLcEglfsKmsDebug)
static void pageFlipHandler(int fd, unsigned int sequence, unsigned int tv_sec, unsigned int tv_usec, void *user_data)
{
Q_UNUSED(fd);
QEglFSKmsEventReaderThread *t = static_cast<QEglFSKmsEventReaderThread *>(QThread::currentThread());
t->eventHost()->handlePageFlipCompleted(user_data);
QEglFSKmsScreen *screen = static_cast<QEglFSKmsScreen *>(user_data);
screen->pageFlipped(sequence, tv_sec, tv_usec);
}
class RegisterWaitFlipEvent : public QEvent
{
public:
static const QEvent::Type TYPE = QEvent::Type(QEvent::User + 1);
RegisterWaitFlipEvent(void *key, QMutex *mutex, QWaitCondition *cond)
: QEvent(TYPE), key(key), mutex(mutex), cond(cond)
{ }
void *key;
QMutex *mutex;
QWaitCondition *cond;
};
bool QEglFSKmsEventHost::event(QEvent *event)
{
if (event->type() == RegisterWaitFlipEvent::TYPE) {
RegisterWaitFlipEvent *e = static_cast<RegisterWaitFlipEvent *>(event);
PendingFlipWait *p = &pendingFlipWaits[0];
PendingFlipWait *end = p + MAX_FLIPS;
while (p < end) {
if (!p->key) {
p->key = e->key;
p->mutex = e->mutex;
p->cond = e->cond;
updateStatus();
return true;
}
++p;
}
qWarning("Cannot queue page flip wait (more than %d screens?)", MAX_FLIPS);
e->mutex->lock();
e->cond->wakeOne();
e->mutex->unlock();
return true;
}
return QObject::event(event);
}
void QEglFSKmsEventHost::updateStatus()
{
void **begin = &completedFlips[0];
void **end = begin + MAX_FLIPS;
for (int i = 0; i < MAX_FLIPS; ++i) {
PendingFlipWait *w = pendingFlipWaits + i;
if (!w->key)
continue;
void **p = begin;
while (p < end) {
if (*p == w->key) {
*p = nullptr;
w->key = nullptr;
w->mutex->lock();
w->cond->wakeOne();
w->mutex->unlock();
return;
}
++p;
}
}
}
void QEglFSKmsEventHost::handlePageFlipCompleted(void *key)
{
void **begin = &completedFlips[0];
void **end = begin + MAX_FLIPS;
void **p = begin;
while (p < end) {
if (*p == key) {
updateStatus();
return;
}
++p;
}
p = begin;
while (p < end) {
if (!*p) {
*p = key;
updateStatus();
return;
}
++p;
}
qWarning("Cannot store page flip status (more than %d screens?)", MAX_FLIPS);
}
void QEglFSKmsEventReaderThread::run()
{
qCDebug(qLcEglfsKmsDebug, "Event reader thread: entering event loop");
QSocketNotifier notifier(m_fd, QSocketNotifier::Read);
QObject::connect(¬ifier, &QSocketNotifier::activated, ¬ifier, [this] {
drmEventContext drmEvent;
memset(&drmEvent, 0, sizeof(drmEvent));
drmEvent.version = 2;
drmEvent.vblank_handler = nullptr;
drmEvent.page_flip_handler = pageFlipHandler;
drmHandleEvent(m_fd, &drmEvent);
});
exec();
m_ev.moveToThread(thread()); // move back to the thread where m_ev was created
qCDebug(qLcEglfsKmsDebug, "Event reader thread: event loop stopped");
}
QEglFSKmsEventReader::~QEglFSKmsEventReader()
{
destroy();
}
void QEglFSKmsEventReader::create(QEglFSKmsDevice *device)
{
destroy();
if (!device)
return;
m_device = device;
qCDebug(qLcEglfsKmsDebug, "Initializing event reader for device %p fd %d",
m_device, m_device->fd());
m_thread = new QEglFSKmsEventReaderThread(m_device->fd());
m_thread->start();
// Change thread affinity for the event host, so that postEvent()
// goes through the event reader thread's event loop for that object.
m_thread->eventHost()->moveToThread(m_thread);
}
void QEglFSKmsEventReader::destroy()
{
if (!m_device)
return;
qCDebug(qLcEglfsKmsDebug, "Stopping event reader for device %p", m_device);
if (m_thread) {
m_thread->quit();
m_thread->wait();
delete m_thread;
m_thread = nullptr;
}
m_device = nullptr;
}
void QEglFSKmsEventReader::startWaitFlip(void *key, QMutex *mutex, QWaitCondition *cond)
{
if (m_thread) {
QCoreApplication::postEvent(m_thread->eventHost(),
new RegisterWaitFlipEvent(key, mutex, cond));
}
}
QT_END_NAMESPACE
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