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kwin/plugins/platforms/drm/drm_backend.cpp
Erik Kurzinger d9c79e3627 [platforms/drm] Fix software cursors with drm backend 
Summary:
If hardware cursor support is not available when using the drm backend for
Wayland compositing, the software cursor texture will not be updated when the
cursor image changes, and it will still be drawn when no cursor image is set
(such as when running a full-screen game). Furthermore, the drmModeSetCursor
and drmModeMoveCursor functions will still be unnecessarily called when the
cursor is moved or hidden.

To correct this, SceneOpenGL should connect Platform::cursorChanged as opposed
to Cursor::cursorChanged to its texture update function, as only the former
will be emitted when the cursor is updated and the compositor should check if
the cursor is hidden and the software cursor image is not null before rendering
it. DrmBackend::moveCursor and DrmBackend::hideCursor should also return
immediately if using a software cursor.

Reviewers: #kwin, davidedmundson

Reviewed By: #kwin, davidedmundson

Subscribers: kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D18376
2019-03-19 12:46:16 -07:00

793 lines
24 KiB
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/********************************************************************
KWin - the KDE window manager
This file is part of the KDE project.
Copyright (C) 2015 Martin Gräßlin <mgraesslin@kde.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*********************************************************************/
#include "drm_backend.h"
#include "drm_output.h"
#include "drm_object_connector.h"
#include "drm_object_crtc.h"
#include "drm_object_plane.h"
#include "composite.h"
#include "cursor.h"
#include "logging.h"
#include "logind.h"
#include "main.h"
#include "scene_qpainter_drm_backend.h"
#include "screens_drm.h"
#include "udev.h"
#include "wayland_server.h"
#if HAVE_GBM
#include "egl_gbm_backend.h"
#include <gbm.h>
#endif
// KWayland
#include <KWayland/Server/seat_interface.h>
#include <KWayland/Server/outputconfiguration_interface.h>
// KF5
#include <KConfigGroup>
#include <KCoreAddons>
#include <KLocalizedString>
#include <KSharedConfig>
// Qt
#include <QCryptographicHash>
#include <QSocketNotifier>
#include <QPainter>
// system
#include <algorithm>
#include <unistd.h>
// drm
#include <xf86drm.h>
#include <xf86drmMode.h>
#include <libdrm/drm_mode.h>
#ifndef DRM_CAP_CURSOR_WIDTH
#define DRM_CAP_CURSOR_WIDTH 0x8
#endif
#ifndef DRM_CAP_CURSOR_HEIGHT
#define DRM_CAP_CURSOR_HEIGHT 0x9
#endif
#define KWIN_DRM_EVENT_CONTEXT_VERSION 2
namespace KWin
{
DrmBackend::DrmBackend(QObject *parent)
: Platform(parent)
, m_udev(new Udev)
, m_udevMonitor(m_udev->monitor())
, m_dpmsFilter()
{
setSupportsGammaControl(true);
handleOutputs();
}
DrmBackend::~DrmBackend()
{
#if HAVE_GBM
if (m_gbmDevice) {
gbm_device_destroy(m_gbmDevice);
}
#endif
if (m_fd >= 0) {
// wait for pageflips
while (m_pageFlipsPending != 0) {
QCoreApplication::processEvents(QEventLoop::WaitForMoreEvents);
}
// we need to first remove all outputs
qDeleteAll(m_outputs);
m_outputs.clear();
m_enabledOutputs.clear();
qDeleteAll(m_planes);
qDeleteAll(m_crtcs);
qDeleteAll(m_connectors);
close(m_fd);
}
}
void DrmBackend::init()
{
LogindIntegration *logind = LogindIntegration::self();
auto takeControl = [logind, this]() {
if (logind->hasSessionControl()) {
openDrm();
} else {
logind->takeControl();
connect(logind, &LogindIntegration::hasSessionControlChanged, this, &DrmBackend::openDrm);
}
};
if (logind->isConnected()) {
takeControl();
} else {
connect(logind, &LogindIntegration::connectedChanged, this, takeControl);
}
}
Outputs DrmBackend::outputs() const
{
return m_outputs;
}
Outputs DrmBackend::enabledOutputs() const
{
return m_enabledOutputs;
}
void DrmBackend::outputWentOff()
{
if (!m_dpmsFilter.isNull()) {
// already another output is off
return;
}
m_dpmsFilter.reset(new DpmsInputEventFilter(this));
input()->prependInputEventFilter(m_dpmsFilter.data());
}
void DrmBackend::turnOutputsOn()
{
m_dpmsFilter.reset();
for (auto it = m_enabledOutputs.constBegin(), end = m_enabledOutputs.constEnd(); it != end; it++) {
(*it)->updateDpms(KWayland::Server::OutputInterface::DpmsMode::On);
}
}
void DrmBackend::checkOutputsAreOn()
{
if (m_dpmsFilter.isNull()) {
// already disabled, all outputs are on
return;
}
for (auto it = m_enabledOutputs.constBegin(), end = m_enabledOutputs.constEnd(); it != end; it++) {
if (!(*it)->isDpmsEnabled()) {
// dpms still disabled, need to keep the filter
return;
}
}
// all outputs are on, disable the filter
m_dpmsFilter.reset();
}
void DrmBackend::activate(bool active)
{
if (active) {
qCDebug(KWIN_DRM) << "Activating session.";
reactivate();
} else {
qCDebug(KWIN_DRM) << "Deactivating session.";
deactivate();
}
}
void DrmBackend::reactivate()
{
if (m_active) {
return;
}
m_active = true;
if (!usesSoftwareCursor()) {
const QPoint cp = Cursor::pos() - softwareCursorHotspot();
for (auto it = m_outputs.constBegin(); it != m_outputs.constEnd(); ++it) {
DrmOutput *o = *it;
// only relevant in atomic mode
o->m_modesetRequested = true;
o->pageFlipped(); // TODO: Do we really need this?
o->m_crtc->blank();
o->showCursor();
o->moveCursor(cp);
}
}
// restart compositor
m_pageFlipsPending = 0;
if (Compositor *compositor = Compositor::self()) {
compositor->bufferSwapComplete();
compositor->addRepaintFull();
}
}
void DrmBackend::deactivate()
{
if (!m_active) {
return;
}
// block compositor
if (m_pageFlipsPending == 0 && Compositor::self()) {
Compositor::self()->aboutToSwapBuffers();
}
// hide cursor and disable
for (auto it = m_outputs.constBegin(); it != m_outputs.constEnd(); ++it) {
DrmOutput *o = *it;
o->hideCursor();
}
m_active = false;
}
void DrmBackend::pageFlipHandler(int fd, unsigned int frame, unsigned int sec, unsigned int usec, void *data)
{
Q_UNUSED(fd)
Q_UNUSED(frame)
Q_UNUSED(sec)
Q_UNUSED(usec)
auto output = reinterpret_cast<DrmOutput*>(data);
output->pageFlipped();
output->m_backend->m_pageFlipsPending--;
if (output->m_backend->m_pageFlipsPending == 0) {
// TODO: improve, this currently means we wait for all page flips or all outputs.
// It would be better to driver the repaint per output
if (output->m_dpmsAtomicOffPending) {
output->m_modesetRequested = true;
output->dpmsAtomicOff();
}
if (Compositor::self()) {
Compositor::self()->bufferSwapComplete();
}
}
}
void DrmBackend::openDrm()
{
connect(LogindIntegration::self(), &LogindIntegration::sessionActiveChanged, this, &DrmBackend::activate);
UdevDevice::Ptr device = m_udev->primaryGpu();
if (!device) {
qCWarning(KWIN_DRM) << "Did not find a GPU";
return;
}
int fd = LogindIntegration::self()->takeDevice(device->devNode());
if (fd < 0) {
qCWarning(KWIN_DRM) << "failed to open drm device at" << device->devNode();
return;
}
m_fd = fd;
m_active = true;
QSocketNotifier *notifier = new QSocketNotifier(m_fd, QSocketNotifier::Read, this);
connect(notifier, &QSocketNotifier::activated, this,
[this] {
if (!LogindIntegration::self()->isActiveSession()) {
return;
}
drmEventContext e;
memset(&e, 0, sizeof e);
e.version = KWIN_DRM_EVENT_CONTEXT_VERSION;
e.page_flip_handler = pageFlipHandler;
drmHandleEvent(m_fd, &e);
}
);
m_drmId = device->sysNum();
// trying to activate Atomic Mode Setting (this means also Universal Planes)
if (!qEnvironmentVariableIsSet("KWIN_DRM_NO_AMS")) {
if (drmSetClientCap(m_fd, DRM_CLIENT_CAP_ATOMIC, 1) == 0) {
qCDebug(KWIN_DRM) << "Using Atomic Mode Setting.";
m_atomicModeSetting = true;
ScopedDrmPointer<drmModePlaneRes, &drmModeFreePlaneResources> planeResources(drmModeGetPlaneResources(m_fd));
if (!planeResources) {
qCWarning(KWIN_DRM) << "Failed to get plane resources. Falling back to legacy mode";
m_atomicModeSetting = false;
}
if (m_atomicModeSetting) {
qCDebug(KWIN_DRM) << "Number of planes:" << planeResources->count_planes;
// create the plane objects
for (unsigned int i = 0; i < planeResources->count_planes; ++i) {
drmModePlane *kplane = drmModeGetPlane(m_fd, planeResources->planes[i]);
DrmPlane *p = new DrmPlane(kplane->plane_id, m_fd);
if (p->atomicInit()) {
m_planes << p;
if (p->type() == DrmPlane::TypeIndex::Overlay) {
m_overlayPlanes << p;
}
} else {
delete p;
}
}
if (m_planes.isEmpty()) {
qCWarning(KWIN_DRM) << "Failed to create any plane. Falling back to legacy mode";
m_atomicModeSetting = false;
}
}
} else {
qCWarning(KWIN_DRM) << "drmSetClientCap for Atomic Mode Setting failed. Using legacy mode.";
}
}
ScopedDrmPointer<_drmModeRes, &drmModeFreeResources> resources(drmModeGetResources(m_fd));
drmModeRes *res = resources.data();
if (!resources) {
qCWarning(KWIN_DRM) << "drmModeGetResources failed";
return;
}
for (int i = 0; i < res->count_connectors; ++i) {
m_connectors << new DrmConnector(res->connectors[i], m_fd);
}
for (int i = 0; i < res->count_crtcs; ++i) {
m_crtcs << new DrmCrtc(res->crtcs[i], this, i);
}
if (m_atomicModeSetting) {
auto tryAtomicInit = [] (DrmObject *obj) -> bool {
if (obj->atomicInit()) {
return false;
} else {
delete obj;
return true;
}
};
m_connectors.erase(std::remove_if(m_connectors.begin(), m_connectors.end(), tryAtomicInit), m_connectors.end());
m_crtcs.erase(std::remove_if(m_crtcs.begin(), m_crtcs.end(), tryAtomicInit), m_crtcs.end());
}
initCursor();
updateOutputs();
if (m_outputs.isEmpty()) {
qCWarning(KWIN_DRM) << "No outputs, cannot render, will terminate now";
emit initFailed();
return;
}
// setup udevMonitor
if (m_udevMonitor) {
m_udevMonitor->filterSubsystemDevType("drm");
const int fd = m_udevMonitor->fd();
if (fd != -1) {
QSocketNotifier *notifier = new QSocketNotifier(fd, QSocketNotifier::Read, this);
connect(notifier, &QSocketNotifier::activated, this,
[this] {
auto device = m_udevMonitor->getDevice();
if (!device) {
return;
}
if (device->sysNum() != m_drmId) {
return;
}
if (device->hasProperty("HOTPLUG", "1")) {
qCDebug(KWIN_DRM) << "Received hot plug event for monitored drm device";
updateOutputs();
updateCursor();
}
}
);
m_udevMonitor->enable();
}
}
setReady(true);
}
void DrmBackend::updateOutputs()
{
if (m_fd < 0) {
return;
}
ScopedDrmPointer<_drmModeRes, &drmModeFreeResources> resources(drmModeGetResources(m_fd));
if (!resources) {
qCWarning(KWIN_DRM) << "drmModeGetResources failed";
return;
}
QVector<DrmOutput*> connectedOutputs;
QVector<DrmConnector*> pendingConnectors;
// split up connected connectors in already or not yet assigned ones
for (DrmConnector *con : qAsConst(m_connectors)) {
if (!con->isConnected()) {
continue;
}
if (DrmOutput *o = findOutput(con->id())) {
connectedOutputs << o;
} else {
pendingConnectors << con;
}
}
// check for outputs which got removed
auto it = m_outputs.begin();
while (it != m_outputs.end()) {
if (connectedOutputs.contains(*it)) {
it++;
continue;
}
DrmOutput *removed = *it;
it = m_outputs.erase(it);
m_enabledOutputs.removeOne(removed);
emit outputRemoved(removed);
removed->teardown();
}
// now check new connections
for (DrmConnector *con : qAsConst(pendingConnectors)) {
ScopedDrmPointer<_drmModeConnector, &drmModeFreeConnector> connector(drmModeGetConnector(m_fd, con->id()));
if (!connector) {
continue;
}
if (connector->count_modes == 0) {
continue;
}
bool outputDone = false;
QVector<uint32_t> encoders = con->encoders();
for (auto encId : qAsConst(encoders)) {
ScopedDrmPointer<_drmModeEncoder, &drmModeFreeEncoder> encoder(drmModeGetEncoder(m_fd, encId));
if (!encoder) {
continue;
}
for (DrmCrtc *crtc : qAsConst(m_crtcs)) {
if (!(encoder->possible_crtcs & (1 << crtc->resIndex()))) {
continue;
}
// check if crtc isn't used yet -- currently we don't allow multiple outputs on one crtc (cloned mode)
auto it = std::find_if(connectedOutputs.constBegin(), connectedOutputs.constEnd(),
[crtc] (DrmOutput *o) {
return o->m_crtc == crtc;
}
);
if (it != connectedOutputs.constEnd()) {
continue;
}
// we found a suitable encoder+crtc
// TODO: we could avoid these lib drm calls if we store all struct data in DrmCrtc and DrmConnector in the beginning
ScopedDrmPointer<_drmModeCrtc, &drmModeFreeCrtc> modeCrtc(drmModeGetCrtc(m_fd, crtc->id()));
if (!modeCrtc) {
continue;
}
DrmOutput *output = new DrmOutput(this);
con->setOutput(output);
output->m_conn = con;
crtc->setOutput(output);
output->m_crtc = crtc;
connect(output, &DrmOutput::dpmsChanged, this, &DrmBackend::outputDpmsChanged);
if (modeCrtc->mode_valid) {
output->m_mode = modeCrtc->mode;
} else {
output->m_mode = connector->modes[0];
}
qCDebug(KWIN_DRM) << "For new output use mode " << output->m_mode.name;
if (!output->init(connector.data())) {
qCWarning(KWIN_DRM) << "Failed to create output for connector " << con->id();
delete output;
continue;
}
if (!output->initCursor(m_cursorSize)) {
setSoftWareCursor(true);
}
qCDebug(KWIN_DRM) << "Found new output with uuid" << output->uuid();
connectedOutputs << output;
emit outputAdded(output);
outputDone = true;
break;
}
if (outputDone) {
break;
}
}
}
std::sort(connectedOutputs.begin(), connectedOutputs.end(), [] (DrmOutput *a, DrmOutput *b) { return a->m_conn->id() < b->m_conn->id(); });
m_outputs = connectedOutputs;
m_enabledOutputs = connectedOutputs;
readOutputsConfiguration();
if (!m_outputs.isEmpty()) {
emit screensQueried();
}
}
void DrmBackend::readOutputsConfiguration()
{
if (m_outputs.isEmpty()) {
return;
}
const QByteArray uuid = generateOutputConfigurationUuid();
const auto outputGroup = kwinApp()->config()->group("DrmOutputs");
const auto configGroup = outputGroup.group(uuid);
// default position goes from left to right
QPoint pos(0, 0);
for (auto it = m_outputs.begin(); it != m_outputs.end(); ++it) {
qCDebug(KWIN_DRM) << "Reading output configuration for [" << uuid << "] ["<< (*it)->uuid() << "]";
const auto outputConfig = configGroup.group((*it)->uuid());
(*it)->setGlobalPos(outputConfig.readEntry<QPoint>("Position", pos));
// TODO: add mode
(*it)->setScale(outputConfig.readEntry("Scale", 1.0));
pos.setX(pos.x() + (*it)->geometry().width());
}
}
QByteArray DrmBackend::generateOutputConfigurationUuid() const
{
auto it = m_outputs.constBegin();
if (m_outputs.size() == 1) {
// special case: one output
return (*it)->uuid();
}
QCryptographicHash hash(QCryptographicHash::Md5);
for (; it != m_outputs.constEnd(); ++it) {
hash.addData((*it)->uuid());
}
return hash.result().toHex().left(10);
}
void DrmBackend::configurationChangeRequested(KWayland::Server::OutputConfigurationInterface *config)
{
const auto changes = config->changes();
bool countChanged = false;
//process all non-disabling changes
for (auto it = changes.begin(); it != changes.end(); it++) {
KWayland::Server::OutputChangeSet *changeset = it.value();
auto drmoutput = findOutput(it.key()->uuid());
if (drmoutput == nullptr) {
qCWarning(KWIN_DRM) << "Could NOT find DrmOutput matching " << it.key()->uuid();
continue;
}
if (changeset->enabledChanged() && changeset->enabled() == KWayland::Server::OutputDeviceInterface::Enablement::Enabled) {
drmoutput->setEnabled(true);
m_enabledOutputs << drmoutput;
emit outputAdded(drmoutput);
countChanged = true;
}
drmoutput->setChanges(changeset);
}
//process any disable requests
for (auto it = changes.begin(); it != changes.end(); it++) {
KWayland::Server::OutputChangeSet *changeset = it.value();
if (changeset->enabledChanged() && changeset->enabled() == KWayland::Server::OutputDeviceInterface::Enablement::Disabled) {
if (m_enabledOutputs.count() == 1) {
qCWarning(KWIN_DRM) << "Not disabling final screen" << it.key()->uuid();
continue;
}
auto drmoutput = findOutput(it.key()->uuid());
if (drmoutput == nullptr) {
qCWarning(KWIN_DRM) << "Could NOT find DrmOutput matching " << it.key()->uuid();
continue;
}
drmoutput->setEnabled(false);
m_enabledOutputs.removeOne(drmoutput);
emit outputRemoved(drmoutput);
countChanged = true;
}
}
if (countChanged) {
emit screensQueried();
} else {
emit screens()->changed();
}
config->setApplied();
}
DrmOutput *DrmBackend::findOutput(quint32 connector)
{
auto it = std::find_if(m_outputs.constBegin(), m_outputs.constEnd(), [connector] (DrmOutput *o) {
return o->m_conn->id() == connector;
});
if (it != m_outputs.constEnd()) {
return *it;
}
return nullptr;
}
DrmOutput *DrmBackend::findOutput(const QByteArray &uuid)
{
auto it = std::find_if(m_outputs.constBegin(), m_outputs.constEnd(), [uuid] (DrmOutput *o) {
return o->m_uuid == uuid;
});
if (it != m_outputs.constEnd()) {
return *it;
}
return nullptr;
}
void DrmBackend::present(DrmBuffer *buffer, DrmOutput *output)
{
if (!buffer || buffer->bufferId() == 0) {
if (m_deleteBufferAfterPageFlip) {
delete buffer;
}
return;
}
if (output->present(buffer)) {
m_pageFlipsPending++;
if (m_pageFlipsPending == 1 && Compositor::self()) {
Compositor::self()->aboutToSwapBuffers();
}
} else if (m_deleteBufferAfterPageFlip) {
delete buffer;
}
}
void DrmBackend::initCursor()
{
m_cursorEnabled = waylandServer()->seat()->hasPointer();
connect(waylandServer()->seat(), &KWayland::Server::SeatInterface::hasPointerChanged, this,
[this] {
m_cursorEnabled = waylandServer()->seat()->hasPointer();
if (usesSoftwareCursor()) {
return;
}
for (auto it = m_outputs.constBegin(); it != m_outputs.constEnd(); ++it) {
if (m_cursorEnabled) {
if (!(*it)->showCursor()) {
setSoftWareCursor(true);
}
} else {
(*it)->hideCursor();
}
}
}
);
uint64_t capability = 0;
QSize cursorSize;
if (drmGetCap(m_fd, DRM_CAP_CURSOR_WIDTH, &capability) == 0) {
cursorSize.setWidth(capability);
} else {
cursorSize.setWidth(64);
}
if (drmGetCap(m_fd, DRM_CAP_CURSOR_HEIGHT, &capability) == 0) {
cursorSize.setHeight(capability);
} else {
cursorSize.setHeight(64);
}
m_cursorSize = cursorSize;
// now we have screens and can set cursors, so start tracking
connect(this, &DrmBackend::cursorChanged, this, &DrmBackend::updateCursor);
connect(Cursor::self(), &Cursor::posChanged, this, &DrmBackend::moveCursor);
}
void DrmBackend::setCursor()
{
if (m_cursorEnabled) {
for (auto it = m_outputs.constBegin(); it != m_outputs.constEnd(); ++it) {
if (!(*it)->showCursor()) {
setSoftWareCursor(true);
}
}
}
markCursorAsRendered();
}
void DrmBackend::updateCursor()
{
if (usesSoftwareCursor()) {
return;
}
if (isCursorHidden()) {
return;
}
const QImage &cursorImage = softwareCursor();
if (cursorImage.isNull()) {
doHideCursor();
return;
}
for (auto it = m_outputs.constBegin(); it != m_outputs.constEnd(); ++it) {
(*it)->updateCursor();
}
setCursor();
moveCursor();
}
void DrmBackend::doShowCursor()
{
updateCursor();
}
void DrmBackend::doHideCursor()
{
if (!m_cursorEnabled || usesSoftwareCursor()) {
return;
}
for (auto it = m_outputs.constBegin(); it != m_outputs.constEnd(); ++it) {
(*it)->hideCursor();
}
}
void DrmBackend::moveCursor()
{
if (!m_cursorEnabled || isCursorHidden() || usesSoftwareCursor()) {
return;
}
for (auto it = m_outputs.constBegin(); it != m_outputs.constEnd(); ++it) {
(*it)->moveCursor(Cursor::pos());
}
}
Screens *DrmBackend::createScreens(QObject *parent)
{
return new DrmScreens(this, parent);
}
QPainterBackend *DrmBackend::createQPainterBackend()
{
m_deleteBufferAfterPageFlip = false;
return new DrmQPainterBackend(this);
}
OpenGLBackend *DrmBackend::createOpenGLBackend()
{
#if HAVE_GBM
m_deleteBufferAfterPageFlip = true;
return new EglGbmBackend(this);
#else
return Platform::createOpenGLBackend();
#endif
}
DrmDumbBuffer *DrmBackend::createBuffer(const QSize &size)
{
DrmDumbBuffer *b = new DrmDumbBuffer(m_fd, size);
return b;
}
#if HAVE_GBM
DrmSurfaceBuffer *DrmBackend::createBuffer(const std::shared_ptr<GbmSurface> &surface)
{
DrmSurfaceBuffer *b = new DrmSurfaceBuffer(m_fd, surface);
return b;
}
#endif
void DrmBackend::outputDpmsChanged()
{
if (m_enabledOutputs.isEmpty()) {
return;
}
bool enabled = false;
for (auto it = m_enabledOutputs.constBegin(); it != m_enabledOutputs.constEnd(); ++it) {
enabled = enabled || (*it)->isDpmsEnabled();
}
setOutputsEnabled(enabled);
}
QVector<CompositingType> DrmBackend::supportedCompositors() const
{
if (selectedCompositor() != NoCompositing) {
return {selectedCompositor()};
}
#if HAVE_GBM
return QVector<CompositingType>{OpenGLCompositing, QPainterCompositing};
#else
return QVector<CompositingType>{QPainterCompositing};
#endif
}
QString DrmBackend::supportInformation() const
{
QString supportInfo;
QDebug s(&supportInfo);
s.nospace();
s << "Name: " << "DRM" << endl;
s << "Active: " << m_active << endl;
s << "Atomic Mode Setting: " << m_atomicModeSetting << endl;
return supportInfo;
}
}
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