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kwin/plugins/platforms/drm/drm_backend.cpp

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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"
#include <colorcorrection/gammaramp.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 <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);
}
qDeleteAll(m_outputs);
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);
}
}
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)->setDpms(DrmOutput::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);
delete removed;
}
// 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();
}
// KCoreAddons needs kwayland's 2b3f9509ac1 to not crash
if (KCoreAddons::version() >= QT_VERSION_CHECK(5, 39, 0)) {
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) {
(*it)->showCursor();
} 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) {
(*it)->showCursor();
}
}
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) {
return;
}
for (auto it = m_outputs.constBegin(); it != m_outputs.constEnd(); ++it) {
(*it)->hideCursor();
}
}
void DrmBackend::moveCursor()
{
if (!m_cursorEnabled || isCursorHidden()) {
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 HAVE_GBM
return QVector<CompositingType>{OpenGLCompositing, QPainterCompositing};
#else
return QVector<CompositingType>{QPainterCompositing};
#endif
}
int DrmBackend::gammaRampSize(int screen) const
{
if (m_outputs.size() <= screen) {
return 0;
}
return m_outputs.at(screen)->m_crtc->getGammaRampSize();
}
bool DrmBackend::setGammaRamp(int screen, ColorCorrect::GammaRamp &gamma)
{
if (m_outputs.size() <= screen) {
return false;
}
return m_outputs.at(screen)->m_crtc->setGammaRamp(gamma);
}
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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