qeglfskmsegldevicescreen.cpp

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// Copyright (C) 2016 Pelagicore AG

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only

// Qt-Security score:significant reason:default

#include "qeglfskmsegldevicescreen.h"

#include "qeglfskmsegldevice.h"

#include <private/qeglfskmsintegration_p.h>

#include <QGuiApplication>

#include <QLoggingCategory>

#include <errno.h>

QT_BEGIN_NAMESPACE

QEglFSKmsEglDeviceScreen::QEglFSKmsEglDeviceScreen(QEglFSKmsDevice *device, const QKmsOutput &output)

    : QEglFSKmsScreen(device, output)

    , m_default_fb_handle(uint32_t(-1))

    , m_default_fb_id(uint32_t(-1))

    const int fd = device->fd();

    struct drm_mode_create_dumb createRequest;

    createRequest.width = output.size.width();

    createRequest.height = output.size.height();

    createRequest.bpp = 32;

    createRequest.flags = 0;

    qCDebug(qLcEglfsKmsDebug, "Creating dumb fb %dx%d", createRequest.width, createRequest.height);

    int ret = drmIoctl(fd, DRM_IOCTL_MODE_CREATE_DUMB, &createRequest);

    if (ret < 0)

        qFatal("Unable to create dumb buffer.\n");

    m_default_fb_handle = createRequest.handle;

    uint32_t handles[4] = { 0, 0, 0, 0 };

    uint32_t pitches[4] = { 0, 0, 0, 0 };

    uint32_t offsets[4] = { 0, 0, 0, 0 };

    handles[0] = createRequest.handle;

    pitches[0] = createRequest.pitch;

    offsets[0] = 0;

    ret = drmModeAddFB2(fd, createRequest.width, createRequest.height, DRM_FORMAT_ARGB8888, handles,

                        pitches, offsets, &m_default_fb_id, 0);

    if (ret)

        qFatal("Unable to add fb\n");

    qCDebug(qLcEglfsKmsDebug, "Added dumb fb %dx%d handle:%u pitch:%d id:%u", createRequest.width, createRequest.height,

        createRequest.handle, createRequest.pitch, m_default_fb_id);

QEglFSKmsEglDeviceScreen::~QEglFSKmsEglDeviceScreen()

    int ret;

    const int fd = device()->fd();

    if (m_default_fb_id != uint32_t(-1)) {

        ret = drmModeRmFB(fd, m_default_fb_id);

        if (ret)

            qErrnoWarning("drmModeRmFB failed");

    if (m_default_fb_handle != uint32_t(-1)) {

        struct drm_mode_destroy_dumb destroyRequest;

        destroyRequest.handle = m_default_fb_handle;

        ret = drmIoctl(fd, DRM_IOCTL_MODE_DESTROY_DUMB, &destroyRequest);

        if (ret)

            qErrnoWarning("DRM_IOCTL_MODE_DESTROY_DUMB failed");

    const int remainingScreenCount = qGuiApp->screens().size();

    qCDebug(qLcEglfsKmsDebug, "Screen dtor. %p Remaining screens: %d", this, remainingScreenCount);

    if (!remainingScreenCount && !device()->screenConfig()->separateScreens())

        static_cast<QEglFSKmsEglDevice *>(device())->destroyGlobalCursor();

QPlatformCursor *QEglFSKmsEglDeviceScreen::cursor() const

    // The base class creates a cursor via integration->createCursor()

    // in its ctor. With separateScreens just use that. Otherwise

    // there's a virtual desktop and the device has a global cursor

    // and the base class has no dedicated cursor at all.

    // config->hwCursor() is ignored for now, just use the standard OpenGL cursor.

    return device()->screenConfig()->separateScreens()

        ? QEglFSScreen::cursor()

        : static_cast<QEglFSKmsEglDevice *>(device())->globalCursor();

void QEglFSKmsEglDeviceScreen::waitForFlip()

    QKmsOutput &op(output());

    const int fd = device()->fd();

    const uint32_t w = op.modes[op.mode].hdisplay;

    const uint32_t h = op.modes[op.mode].vdisplay;

    if (!op.mode_set) {

        op.mode_set = true;

        drmModeCrtcPtr currentMode = drmModeGetCrtc(fd, op.crtc_id);

        const bool alreadySet = currentMode && currentMode->width == w && currentMode->height == h;

        if (currentMode)

            drmModeFreeCrtc(currentMode);

        if (alreadySet) {

            // Maybe detecting the DPMS mode could help here, but there are no properties

            // exposed on the connector apparently. So rely on an env var for now.

            // Note that typically, we need to set crtc with the default fb even if the

            // mode did not change, unless QT_QPA_EGLFS_ALWAYS_SET_MODE is explicitly specified.

            static bool envVarSet = false;

            static bool alwaysDoSet = qEnvironmentVariableIntValue("QT_QPA_EGLFS_ALWAYS_SET_MODE", &envVarSet);

            if (envVarSet && !alwaysDoSet) {

                qCDebug(qLcEglfsKmsDebug, "Mode already set");

                return;

        qCDebug(qLcEglfsKmsDebug, "Setting mode");

        int ret = drmModeSetCrtc(fd, op.crtc_id,

                                 m_default_fb_id, 0, 0,

                                 &op.connector_id, 1,

                                 &op.modes[op.mode]);

        if (ret)

            qErrnoWarning(errno, "drmModeSetCrtc failed");

    if (!op.forced_plane_set) {

        op.forced_plane_set = true;

        if (op.wants_forced_plane) {

            qCDebug(qLcEglfsKmsDebug, "Setting plane %u", op.forced_plane_id);

            int ret = drmModeSetPlane(fd, op.forced_plane_id, op.crtc_id, m_default_fb_id, 0,

                                      0, 0, w, h,

                                      0 << 16, 0 << 16, op.size.width() << 16, op.size.height() << 16);

            if (ret == -1)

                qErrnoWarning(errno, "drmModeSetPlane failed");

QT_END_NAMESPACE