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Hypothesis under test: KWin's Transaction::watchDmaBuf calls DMA_BUF_IOCTL_EXPORT_SYNC_FILE on every plane of every imported dmabuf and parks the transaction on a QSocketNotifier(POLLIN) waiting for that sync_file. On V4L2 hantro CAPTURE buffers (RK3566 mainline 6.19, panfrost mesa 26.0.5) the resulting fence either never signals or signals so late that chrome's 6-buffer V4L2 capture pool exhausts at ~6s, hard-stalling the decoder. mpv with gpu-next slideshows at 76% drop. weston A/B with same chrome v4 binary plays through clean — KWin's watchDmaBuf is the suspect. This experiment patches watchDmaBuf to no-op. Wayland clients are required by spec to ensure buffer contents are complete before wl_surface.attach+commit, so the fence-wait is a defensive optimization for misbehaving clients, not a correctness primitive. If chrome plays through end-to-end at the recorded 34.7% combined CPU number with this patched KWin, the bug is confirmed and the upstream fix can be refined (timeout, V4L2-source skip, or use the dmabuf fd directly in the QSocketNotifier instead of an extra exported sync_file). KWIN_PIVOT.md (in chromium-fourier/) carries the discovery thread.
126 lines
3.8 KiB
Bash
126 lines
3.8 KiB
Bash
# Maintainer: Markus Fritsche <mfritsche@reauktion.de>
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# Upstream maintainers: Felix Yan, Antonio Rojas
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# Contributor: Andrea Scarpino <andrea@archlinux.org>
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#
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# kwin-fourier — KWin 6.6.4 with the V4L2-stateless implicit-sync
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# transaction wait bypass. Hypothesis: KWin's
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# `Transaction::watchDmaBuf` calls DMA_BUF_IOCTL_EXPORT_SYNC_FILE on
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# every plane of every imported dmabuf and parks the transaction on a
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# QSocketNotifier waiting for the resulting sync_file fd to become
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# readable. For V4L2 hantro CAPTURE buffers on RK3566 mainline 6.19,
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# that fence either never signals or signals so late that chrome's
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# 6-buffer V4L2 capture pool exhausts at ~6 seconds, blocking the
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# decoder. mpv (single-surface attach pattern) merely slideshows
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# under KWin (76% drop rate); chrome (subsurface attach) deadlocks.
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#
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# This experimental build no-ops `watchDmaBuf` to test the
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# hypothesis. If chrome plays through end-to-end at the recorded
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# 34.7% CPU number, the bug is confirmed and the upstream fix can be
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# refined (e.g., short timeout, skip-on-V4L2, or use the dmabuf fd
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# directly without exporting an extra sync_file). See
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# ../chromium-fourier/KWIN_PIVOT.md for the full diagnosis thread.
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pkgname=kwin
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pkgver=6.6.4
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_dirver=$(echo $pkgver | cut -d. -f1-3)
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pkgrel=1
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epoch=1
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arch=(aarch64 x86_64)
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url='https://kde.org/plasma-desktop/'
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license=(LGPL-2.0-or-later)
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depends=(aurorae
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breeze
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gcc-libs
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glibc
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iio-sensor-proxy
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plasma-activities
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kauth
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kcmutils
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kcolorscheme
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kconfig
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kcoreaddons
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kcrash
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kdbusaddons
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kdeclarative
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kdecoration
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kglobalaccel
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kglobalacceld
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kguiaddons
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ki18n
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kidletime
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kirigami
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kitemmodels
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knewstuff
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knighttime
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knotifications
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kpackage
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kquickcharts
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kscreenlocker
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kservice
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ksvg
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kwayland
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kwidgetsaddons
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kwindowsystem
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kxmlgui
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lcms2
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libcanberra
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libdisplay-info
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libdrm
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libei
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libepoxy
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libevdev
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libinput
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libpipewire
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libqaccessibilityclient-qt6
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libxcb
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libxcvt
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libxkbcommon
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mesa
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milou
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pipewire-session-manager
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libplasma
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qt6-5compat
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qt6-base
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qt6-declarative
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qt6-svg
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qt6-tools
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systemd-libs
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wayland
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xcb-util-keysyms
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xcb-util-wm)
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makedepends=(extra-cmake-modules
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kdoctools
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krunner
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plasma-wayland-protocols
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python
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wayland-protocols
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xorg-xwayland)
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optdepends=('plasma-keyboard: virtual keyboard')
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groups=(plasma)
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source=(https://download.kde.org/stable/plasma/$_dirver/$pkgname-$pkgver.tar.xz{,.sig}
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0001-transaction-bypass-watchDmaBuf-fence-wait.patch)
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sha256sums=('3f9439760580a977d018daf4b35b62e5a1700def7b21c8dfbfc789d21378d7ad'
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'SKIP'
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'SKIP')
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validpgpkeys=('E0A3EB202F8E57528E13E72FD7574483BB57B18D' # Jonathan Esk-Riddell <jr@jriddell.org>
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'0AAC775BB6437A8D9AF7A3ACFE0784117FBCE11D' # Bhushan Shah <bshah@kde.org>
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'D07BD8662C56CB291B316EB2F5675605C74E02CF' # David Edmundson <davidedmundson@kde.org>
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'90A968ACA84537CC27B99EAF2C8DF587A6D4AAC1' # Nicolas Fella <nicolas.fella@kde.org>
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'1FA881591C26B276D7A5518EEAAF29B42A678C20') # Marco Martin <notmart@gmail.com>
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prepare() {
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patch -d $pkgname-$pkgver -p1 < 0001-transaction-bypass-watchDmaBuf-fence-wait.patch
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}
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build() {
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cmake -B build -S $pkgname-$pkgver \
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-DCMAKE_INSTALL_LIBEXECDIR=lib \
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-DBUILD_TESTING=OFF
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cmake --build build
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}
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package() {
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DESTDIR="$pkgdir" cmake --install build
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setcap CAP_SYS_NICE=+ep "$pkgdir"/usr/bin/kwin_wayland
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}
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