eglfs: Split kms integration into multiple files

Now that it's a plugin, the restrictions for the compiled-in hooks
do not apply. Make it maintainable and prepare for future development
by splitting up properly.

The actual functions are not touched at all in this patch.

Change-Id: I4c666817afe15b31a63c1f9fc01413e9a2376a3b
Reviewed-by: Louai Al-Khanji <louai.al-khanji@theqtcompany.com>

1 files changed, 408 insertions, 0 deletions

diff --git a/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms/qeglfskmsdevice.cpp b/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms/qeglfskmsdevice.cpp
new file mode 100644
index 0000000000..d8f0f01aff
--- /dev/null
+++ b/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms/qeglfskmsdevice.cpp
@@ -0,0 +1,408 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qeglfskmsdevice.h"
+#include "qeglfskmsscreen.h"
+
+#include "qeglfsintegration.h"
+
+#include <QtCore/QLoggingCategory>
+#include <QtCore/private/qcore_unix_p.h>
+#include <QtGui/private/qguiapplication_p.h>
+
+#define ARRAY_LENGTH(a) (sizeof (a) / sizeof (a)[0])
+
+QT_BEGIN_NAMESPACE
+
+Q_DECLARE_LOGGING_CATEGORY(qLcEglfsKmsDebug)
+
+enum OutputConfiguration {
+    OutputConfigOff,
+    OutputConfigPreferred,
+    OutputConfigCurrent,
+    OutputConfigMode,
+    OutputConfigModeline
+};
+
+int QEglFSKmsDevice::crtcForConnector(drmModeResPtr resources, drmModeConnectorPtr connector)
+{
+    for (int i = 0; i < connector->count_encoders; i++) {
+        drmModeEncoderPtr encoder = drmModeGetEncoder(m_dri_fd, connector->encoders[i]);
+        if (!encoder) {
+            qWarning("Failed to get encoder");
+            continue;
+        }
+
+        quint32 possibleCrtcs = encoder->possible_crtcs;
+        drmModeFreeEncoder(encoder);
+
+        for (int j = 0; j < resources->count_crtcs; j++) {
+            bool isPossible = possibleCrtcs & (1 << j);
+            bool isAvailable = !(m_crtc_allocator & 1 << resources->crtcs[j]);
+
+            if (isPossible && isAvailable)
+                return j;
+        }
+    }
+
+    return -1;
+}
+
+static const char * const connector_type_names[] = {
+    "None",
+    "VGA",
+    "DVI",
+    "DVI",
+    "DVI",
+    "Composite",
+    "TV",
+    "LVDS",
+    "CTV",
+    "DIN",
+    "DP",
+    "HDMI",
+    "HDMI",
+    "TV",
+    "eDP",
+};
+
+static QString nameForConnector(const drmModeConnectorPtr connector)
+{
+    QString connectorName = "UNKNOWN";
+
+    if (connector->connector_type < ARRAY_LENGTH(connector_type_names))
+        connectorName = connector_type_names[connector->connector_type];
+
+    connectorName += QString::number(connector->connector_type_id);
+
+    return connectorName;
+}
+
+static bool parseModeline(const QString &s, drmModeModeInfoPtr mode)
+{
+    char hsync[16];
+    char vsync[16];
+    float fclock;
+
+    mode->type = DRM_MODE_TYPE_USERDEF;
+    mode->hskew = 0;
+    mode->vscan = 0;
+    mode->vrefresh = 0;
+    mode->flags = 0;
+
+    if (sscanf(qPrintable(s), "%f %hd %hd %hd %hd %hd %hd %hd %hd %15s %15s",
+               &fclock,
+               &mode->hdisplay,
+               &mode->hsync_start,
+               &mode->hsync_end,
+               &mode->htotal,
+               &mode->vdisplay,
+               &mode->vsync_start,
+               &mode->vsync_end,
+               &mode->vtotal, hsync, vsync) != 11)
+        return false;
+
+    mode->clock = fclock * 1000;
+
+    if (strcmp(hsync, "+hsync") == 0)
+        mode->flags |= DRM_MODE_FLAG_PHSYNC;
+    else if (strcmp(hsync, "-hsync") == 0)
+        mode->flags |= DRM_MODE_FLAG_NHSYNC;
+    else
+        return false;
+
+    if (strcmp(vsync, "+vsync") == 0)
+        mode->flags |= DRM_MODE_FLAG_PVSYNC;
+    else if (strcmp(vsync, "-vsync") == 0)
+        mode->flags |= DRM_MODE_FLAG_NVSYNC;
+    else
+        return false;
+
+    return true;
+}
+
+QEglFSKmsScreen *QEglFSKmsDevice::screenForConnector(drmModeResPtr resources, drmModeConnectorPtr connector, QPoint pos)
+{
+    const QString connectorName = nameForConnector(connector);
+
+    const int crtc = crtcForConnector(resources, connector);
+    if (crtc < 0) {
+        qWarning() << "No usable crtc/encoder pair for connector" << connectorName;
+        return Q_NULLPTR;
+    }
+
+    OutputConfiguration configuration;
+    QSize configurationSize;
+    drmModeModeInfo configurationModeline;
+
+    const QString mode = m_integration->outputSettings().value(connectorName).value("mode", "preferred").toString().toLower();
+    if (mode == "off") {
+        configuration = OutputConfigOff;
+    } else if (mode == "preferred") {
+        configuration = OutputConfigPreferred;
+    } else if (mode == "current") {
+        configuration = OutputConfigCurrent;
+    } else if (sscanf(qPrintable(mode), "%dx%d", &configurationSize.rwidth(), &configurationSize.rheight()) == 2) {
+        configuration = OutputConfigMode;
+    } else if (parseModeline(mode, &configurationModeline)) {
+        configuration = OutputConfigModeline;
+    } else {
+        qWarning("Invalid mode \"%s\" for output %s", qPrintable(mode), qPrintable(connectorName));
+        configuration = OutputConfigPreferred;
+    }
+
+    const uint32_t crtc_id = resources->crtcs[crtc];
+
+    if (configuration == OutputConfigOff) {
+        qCDebug(qLcEglfsKmsDebug) << "Turning off output" << connectorName;
+        drmModeSetCrtc(m_dri_fd, crtc_id, 0, 0, 0, 0, 0, Q_NULLPTR);
+        return Q_NULLPTR;
+    }
+
+    // Get the current mode on the current crtc
+    drmModeModeInfo crtc_mode;
+    memset(&crtc_mode, 0, sizeof crtc_mode);
+    if (drmModeEncoderPtr encoder = drmModeGetEncoder(m_dri_fd, connector->connector_id)) {
+        drmModeCrtcPtr crtc = drmModeGetCrtc(m_dri_fd, encoder->crtc_id);
+        drmModeFreeEncoder(encoder);
+
+        if (!crtc)
+            return Q_NULLPTR;
+
+        if (crtc->mode_valid)
+            crtc_mode = crtc->mode;
+
+        drmModeFreeCrtc(crtc);
+    }
+
+    QList<drmModeModeInfo> modes;
+    qCDebug(qLcEglfsKmsDebug) << connectorName << "mode count:" << connector->count_modes;
+    for (int i = 0; i < connector->count_modes; i++) {
+        const drmModeModeInfo &mode = connector->modes[i];
+        qCDebug(qLcEglfsKmsDebug) << "mode" << i << mode.hdisplay << "x" << mode.vdisplay
+                                  << "@" << mode.vrefresh << "hz";
+        modes << connector->modes[i];
+    }
+
+    int preferred = -1;
+    int current = -1;
+    int configured = -1;
+    int best = -1;
+
+    for (int i = modes.size() - 1; i >= 0; i--) {
+        const drmModeModeInfo &m = modes.at(i);
+
+        if (configuration == OutputConfigMode &&
+                m.hdisplay == configurationSize.width() &&
+                m.vdisplay == configurationSize.height()) {
+            configured = i;
+        }
+
+        if (!memcmp(&crtc_mode, &m, sizeof m))
+            current = i;
+
+        if (m.type & DRM_MODE_TYPE_PREFERRED)
+            preferred = i;
+
+        best = i;
+    }
+
+    if (configuration == OutputConfigModeline) {
+        modes << configurationModeline;
+        configured = modes.size() - 1;
+    }
+
+    if (current < 0 && crtc_mode.clock != 0) {
+        modes << crtc_mode;
+        current = mode.size() - 1;
+    }
+
+    if (configuration == OutputConfigCurrent)
+        configured = current;
+
+    int selected_mode = -1;
+
+    if (configured >= 0)
+        selected_mode = configured;
+    else if (preferred >= 0)
+        selected_mode = preferred;
+    else if (current >= 0)
+        selected_mode = current;
+    else if (best >= 0)
+        selected_mode = best;
+
+    if (selected_mode < 0) {
+        qWarning() << "No modes available for output" << connectorName;
+        return Q_NULLPTR;
+    } else {
+        int width = modes[selected_mode].hdisplay;
+        int height = modes[selected_mode].vdisplay;
+        int refresh = modes[selected_mode].vrefresh;
+        qCDebug(qLcEglfsKmsDebug) << "Selected mode" << selected_mode << ":" << width << "x" << height
+                                  << "@" << refresh << "hz for output" << connectorName;
+    }
+
+    QEglFSKmsOutput output = {
+        connectorName,
+        connector->connector_id,
+        crtc_id,
+        QSizeF(connector->mmWidth, connector->mmHeight),
+        selected_mode,
+        false,
+        drmModeGetCrtc(m_dri_fd, crtc_id),
+        modes
+    };
+
+    m_crtc_allocator |= (1 << output.crtc_id);
+    m_connector_allocator |= (1 << output.connector_id);
+
+    return new QEglFSKmsScreen(m_integration, this, output, pos);
+}
+
+void QEglFSKmsDevice::pageFlipHandler(int fd, unsigned int sequence, unsigned int tv_sec, unsigned int tv_usec, void *user_data)
+{
+    Q_UNUSED(fd);
+    Q_UNUSED(sequence);
+    Q_UNUSED(tv_sec);
+    Q_UNUSED(tv_usec);
+
+    QEglFSKmsScreen *screen = static_cast<QEglFSKmsScreen *>(user_data);
+    screen->flipFinished();
+}
+
+QEglFSKmsDevice::QEglFSKmsDevice(QEglFSKmsIntegration *integration, const QString &path)
+    : m_integration(integration)
+    , m_path(path)
+    , m_dri_fd(-1)
+    , m_gbm_device(Q_NULLPTR)
+    , m_crtc_allocator(0)
+    , m_connector_allocator(0)
+{
+}
+
+bool QEglFSKmsDevice::open()
+{
+    Q_ASSERT(m_dri_fd == -1);
+    Q_ASSERT(m_gbm_device == Q_NULLPTR);
+
+    qCDebug(qLcEglfsKmsDebug) << "Opening device" << m_path;
+    m_dri_fd = qt_safe_open(m_path.toLocal8Bit().constData(), O_RDWR | O_CLOEXEC);
+    if (m_dri_fd == -1) {
+        qErrnoWarning("Could not open DRM device %s", qPrintable(m_path));
+        return false;
+    }
+
+    qCDebug(qLcEglfsKmsDebug) << "Creating GBM device for file descriptor" << m_dri_fd
+                              << "obtained from" << m_path;
+    m_gbm_device = gbm_create_device(m_dri_fd);
+    if (!m_gbm_device) {
+        qErrnoWarning("Could not create GBM device");
+        qt_safe_close(m_dri_fd);
+        m_dri_fd = -1;
+        return false;
+    }
+
+    return true;
+}
+
+void QEglFSKmsDevice::close()
+{
+    if (m_gbm_device) {
+        gbm_device_destroy(m_gbm_device);
+        m_gbm_device = Q_NULLPTR;
+    }
+
+    if (m_dri_fd != -1) {
+        qt_safe_close(m_dri_fd);
+        m_dri_fd = -1;
+    }
+}
+
+void QEglFSKmsDevice::createScreens()
+{
+    drmModeResPtr resources = drmModeGetResources(m_dri_fd);
+    if (!resources) {
+        qWarning("drmModeGetResources failed");
+        return;
+    }
+
+    QPoint pos(0, 0);
+    QEglFSIntegration *integration = static_cast<QEglFSIntegration *>(QGuiApplicationPrivate::platformIntegration());
+
+    for (int i = 0; i < resources->count_connectors; i++) {
+        drmModeConnectorPtr connector = drmModeGetConnector(m_dri_fd, resources->connectors[i]);
+        if (!connector)
+            continue;
+
+        QEglFSKmsScreen *screen = screenForConnector(resources, connector, pos);
+        if (screen) {
+            integration->addScreen(screen);
+            pos.rx() += screen->geometry().width();
+        }
+
+        drmModeFreeConnector(connector);
+    }
+
+    drmModeFreeResources(resources);
+}
+
+gbm_device *QEglFSKmsDevice::device() const
+{
+    return m_gbm_device;
+}
+
+int QEglFSKmsDevice::fd() const
+{
+    return m_dri_fd;
+}
+
+void QEglFSKmsDevice::handleDrmEvent()
+{
+    drmEventContext drmEvent = {
+        DRM_EVENT_CONTEXT_VERSION,
+        Q_NULLPTR,      // vblank handler
+        pageFlipHandler // page flip handler
+    };
+
+    drmHandleEvent(m_dri_fd, &drmEvent);
+}
+
+QT_END_NAMESPACE