File indexing completed on 2024-06-16 05:05:08

 /*
     KWin - the KDE window manager
     This file is part of the KDE project.
 
     SPDX-FileCopyrightText: 2015 Martin Gräßlin <mgraesslin@kde.org>
     SPDX-FileCopyrightText: 2022 Xaver Hugl <xaver.hugl@gmail.com>
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 #include "drm_buffer.h"
 
 #include "core/graphicsbuffer.h"
 #include "drm_gpu.h"
 
 // system
 #include <sys/mman.h>
 #if defined(Q_OS_LINUX)
 #include <linux/dma-buf.h>
 #include <linux/sync_file.h>
 #endif
 // drm
 #include <drm_fourcc.h>
 #include <sys/ioctl.h>
 #include <unistd.h>
 #include <xf86drm.h>
 #include <xf86drmMode.h>
 #ifdef Q_OS_LINUX
 #include <linux/dma-buf.h>
 #endif
 
 #ifndef DRM_IOCTL_MODE_CLOSEFB
 #define DRM_IOCTL_MODE_CLOSEFB 0xD0
 #endif
 
 namespace KWin
 {
 
 static bool s_envIsSet = false;
 static bool s_disableBufferWait = qEnvironmentVariableIntValue("KWIN_DRM_DISABLE_BUFFER_READABILITY_CHECKS", &s_envIsSet) && s_envIsSet;
 
 DrmFramebuffer::DrmFramebuffer(DrmGpu *gpu, uint32_t fbId, GraphicsBuffer *buffer, FileDescriptor &&readFence)
     : m_framebufferId(fbId)
     , m_gpu(gpu)
     , m_bufferRef(buffer)
 {
     if (s_disableBufferWait || (m_gpu->isI915() && !s_envIsSet)) {
         // buffer readability checks cause frames to be wrongly delayed on some Intel laptops
         // See https://gitlab.freedesktop.org/drm/intel/-/issues/9415
         m_readable = true;
     }
     m_syncFd = std::move(readFence);
 #ifdef DMA_BUF_IOCTL_EXPORT_SYNC_FILE
     if (!m_syncFd.isValid()) {
         dma_buf_export_sync_file req{
             .flags = DMA_BUF_SYNC_READ,
             .fd = -1,
         };
         if (drmIoctl(buffer->dmabufAttributes()->fd[0].get(), DMA_BUF_IOCTL_EXPORT_SYNC_FILE, &req) == 0) {
             m_syncFd = FileDescriptor{req.fd};
         }
     }
 #endif
 }
 
 DrmFramebuffer::~DrmFramebuffer()
 {
     uint32_t nonConstFb = m_framebufferId;
     if (drmIoctl(m_gpu->fd(), DRM_IOCTL_MODE_CLOSEFB, &nonConstFb) != 0) {
         drmIoctl(m_gpu->fd(), DRM_IOCTL_MODE_RMFB, &nonConstFb);
     }
 }
 
 uint32_t DrmFramebuffer::framebufferId() const
 {
     return m_framebufferId;
 }
 
 GraphicsBuffer *DrmFramebuffer::buffer() const
 {
     return *m_bufferRef;
 }
 
 void DrmFramebuffer::releaseBuffer()
 {
     m_bufferRef = nullptr;
 }
 
 const FileDescriptor &DrmFramebuffer::syncFd() const
 {
     return m_syncFd;
 }
 
 bool DrmFramebuffer::isReadable()
 {
     if (m_readable) {
         return true;
     } else if (m_syncFd.isValid()) {
         return m_readable = m_syncFd.isReadable();
     } else {
         const auto &fds = m_bufferRef->dmabufAttributes()->fd;
         return m_readable = std::all_of(fds.begin(), fds.end(), [](const auto &fd) {
                    return !fd.isValid() || fd.isReadable();
                });
     }
 }
 
 void DrmFramebuffer::setDeadline(std::chrono::steady_clock::time_point deadline)
 {
 #ifdef SYNC_IOC_SET_DEADLINE
     if (!m_syncFd.isValid()) {
         return;
     }
     sync_set_deadline args{
         .deadline_ns = uint64_t(deadline.time_since_epoch().count()),
         .pad = 0,
     };
     drmIoctl(m_syncFd.get(), SYNC_IOC_SET_DEADLINE, &args);
 #endif
 }
 }