kwin/src/plugins/platforms/drm/drm_buffer_gbm.cpp

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/*
KWin - the KDE window manager
This file is part of the KDE project.
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SPDX-FileCopyrightText: 2017 Roman Gilg <subdiff@gmail.com>
SPDX-FileCopyrightText: 2015 Martin Gräßlin <mgraesslin@kde.org>
2020-08-02 22:22:19 +00:00
SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "drm_buffer_gbm.h"
#include "gbm_surface.h"
#include "logging.h"
#include "drm_gpu.h"
// system
#include <sys/mman.h>
// c++
#include <cerrno>
// drm
#include <xf86drm.h>
#include <xf86drmMode.h>
#include <gbm.h>
// KWaylandServer
#include "KWaylandServer/buffer_interface.h"
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#include <drm_fourcc.h>
namespace KWin
{
GbmBuffer::GbmBuffer(const QSharedPointer<GbmSurface> &surface)
: m_surface(surface)
{
m_bo = m_surface->lockFrontBuffer();
if (m_bo) {
m_stride = gbm_bo_get_stride(m_bo);
} else {
qCCritical(KWIN_DRM) << "failed to lock front buffer!" << strerror(errno);
}
}
GbmBuffer::GbmBuffer(gbm_bo *buffer, KWaylandServer::BufferInterface *bufferInterface)
: m_bo(buffer)
, m_bufferInterface(bufferInterface)
, m_stride(gbm_bo_get_stride(m_bo))
{
if (m_bufferInterface) {
m_bufferInterface->ref();
connect(m_bufferInterface, &KWaylandServer::BufferInterface::aboutToBeDestroyed, this, &GbmBuffer::clearBufferInterface);
}
}
GbmBuffer::~GbmBuffer()
{
releaseBuffer();
}
void GbmBuffer::releaseBuffer()
{
if (m_bufferInterface) {
clearBufferInterface();
}
if (!m_bo) {
return;
}
if (m_mapping) {
gbm_bo_unmap(m_bo, m_mapping);
}
if (m_surface) {
m_surface->releaseBuffer(m_bo);
} else {
gbm_bo_destroy(m_bo);
}
m_bo = nullptr;
}
bool GbmBuffer::map(uint32_t flags)
{
if (m_data) {
return true;
}
if (!m_bo) {
return false;
}
m_data = gbm_bo_map(m_bo, 0, 0, gbm_bo_get_width(m_bo), gbm_bo_get_height(m_bo), flags, &m_stride, &m_mapping);
return m_data;
}
void GbmBuffer::clearBufferInterface()
{
disconnect(m_bufferInterface, &KWaylandServer::BufferInterface::aboutToBeDestroyed, this, &DrmGbmBuffer::clearBufferInterface);
m_bufferInterface->unref();
m_bufferInterface = nullptr;
}
DrmGbmBuffer::DrmGbmBuffer(DrmGpu *gpu, const QSharedPointer<GbmSurface> &surface)
: DrmBuffer(gpu), GbmBuffer(surface)
{
if (!m_bo) {
return;
}
initialize();
}
DrmGbmBuffer::DrmGbmBuffer(DrmGpu *gpu, gbm_bo *buffer, KWaylandServer::BufferInterface *bufferInterface)
: DrmBuffer(gpu), GbmBuffer(buffer, bufferInterface)
{
initialize();
}
DrmGbmBuffer::~DrmGbmBuffer()
{
if (m_bufferId) {
if (drmModeRmFB(m_gpu->fd(), m_bufferId) != 0) {
qCCritical(KWIN_DRM) << "drmModeRmFB on GPU" << m_gpu->devNode() << "failed!" << strerror(errno);
}
}
}
void DrmGbmBuffer::releaseGbm()
{
releaseBuffer();
}
void DrmGbmBuffer::initialize()
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{
m_size = QSize(gbm_bo_get_width(m_bo), gbm_bo_get_height(m_bo));
uint32_t format = gbm_bo_get_format(m_bo);
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uint32_t handles[4] = { };
uint32_t strides[4] = { };
uint32_t offsets[4] = { };
uint64_t modifiers[4] = { };
if (gbm_bo_get_handle_for_plane(m_bo, 0).s32 != -1) {
for (int i = 0; i < gbm_bo_get_plane_count(m_bo); i++) {
handles[i] = gbm_bo_get_handle_for_plane(m_bo, i).u32;
strides[i] = gbm_bo_get_stride_for_plane(m_bo, i);
offsets[i] = gbm_bo_get_offset(m_bo, i);
modifiers[i] = gbm_bo_get_modifier(m_bo);
}
} else {
handles[0] = gbm_bo_get_handle(m_bo).u32;
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strides[0] = gbm_bo_get_stride(m_bo);
modifiers[0] = DRM_FORMAT_MOD_INVALID;
}
if (modifiers[0] != DRM_FORMAT_MOD_INVALID && m_gpu->addFB2ModifiersSupported()) {
if (drmModeAddFB2WithModifiers(m_gpu->fd(), m_size.width(), m_size.height(), format, handles, strides, offsets, modifiers, &m_bufferId, DRM_MODE_FB_MODIFIERS)) {
gbm_format_name_desc name;
gbm_format_get_name(format, &name);
qCCritical(KWIN_DRM) << "drmModeAddFB2WithModifiers on GPU" << m_gpu->devNode() << "failed for a buffer with format" << name.name << "and modifier" << modifiers[0] << strerror(errno);
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}
} else {
if (drmModeAddFB2(m_gpu->fd(), m_size.width(), m_size.height(), format, handles, strides, offsets, &m_bufferId, 0)) {
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// fallback
if (drmModeAddFB(m_gpu->fd(), m_size.width(), m_size.height(), 24, 32, strides[0], handles[0], &m_bufferId) != 0) {
gbm_format_name_desc name;
gbm_format_get_name(format, &name);
qCCritical(KWIN_DRM) << "drmModeAddFB2 and drmModeAddFB both failed on GPU" << m_gpu->devNode() << "for a buffer with format" << name.name << "and modifier" << modifiers[0] << strerror(errno);
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}
}
}
gbm_bo_set_user_data(m_bo, this, nullptr);
}
}