On Fri, Jan 10, 2014 at 9:58 AM, Rob Clark <robdcl...@gmail.com> wrote: > I suspect that this is somehow on the same level as wl_drm (which is > in mesa, not wayland). The difference here is that since you can > share buffers with various things (video codecs, cameras, etc), ie. > things beyond just the gpu, it makes sense to put the protocol in some > sort of common place rather than duplicating it in 20 places. Perhaps > the thing to do is start creating some proto trees > (git://.../wayland/drmproto ?) for things like this which need a
bleh, 'send' to fast.. s/drmproto/dmabufproto/ > common home but yet don't belong in wayland.git? > > BR, > -R > > On Tue, Jan 7, 2014 at 12:57 PM, Jasper St. Pierre > <jstpie...@mecheye.net> wrote: >> Sorry if this was discussed before, but any reason this is being put in >> Wayland, and in the "wl_" namespace? DMA-BUF is a private Linux kernel >> feature that's really semi-stable, not used by all drivers, and I'd hate for >> it to bit-rot and tell people not to use it, the same way wl_shell went. >> Having it only in the weston source tree, and in a private "dmabuf" >> namespace seems like it should be enough for now. >> >> On Tue, Jan 7, 2014 at 12:41 PM, <benjamin.gaign...@linaro.org> wrote: >>> >>> From: Benjamin Gaignard <benjamin.gaign...@linaro.org> >>> >>> The goal of this serie of patches is to add a way to use >>> dmabuf file descriptor inside wayland and weston. >>> >>> In a context where there is no Mesa EGL (and so no wl_drm protocol) >>> wl_dmabuf >>> could be used as an alternative to shm to share buffers between hardware >>> devices. If your hardware device (video decoder, renderer, etc...) need >>> physical contiguous memory (obviously don't have MMU) wl_dmabuf may save >>> the cost of one copy compare to shm. >>> >>> shm case: >>> videodecoder --(copy into shm_buffer)--> weston(+pixman) --> HW renderer >>> >>> dmabuf case: >>> videodecoder --(directly write in dmabuf buffer)--> weston(+pixman) --> HW >>> renderer >>> >>> The server is responsible to send its supported pixel formats and the >>> device >>> name to be used by the client to allocate buffers. >>> >>> While mmap() call on dmabuf file descriptor result isn't guaranty on all >>> architectures both server and client should take care of it before >>> accessing >>> to buffer data to avoid segfault. >>> >>> This series of patches include wayland and weston modifications. >>> An example of how use wl_dmabuf is provided in >>> weston/clients/simple-dmabuf.c >>> >>> === Wayland === >>> Benjamin Gaignard (1): >>> Add wl_dmabuf protocol >>> >>> protocol/Makefile.am | 6 +- >>> protocol/wayland-dmabuf.xml | 128 ++++++++++++++++++++++++ >>> src/Makefile.am | 12 ++- >>> src/wayland-dmabuf.c | 231 >>> +++++++++++++++++++++++++++++++++++++++++++ >>> src/wayland-dmabuf.h | 123 +++++++++++++++++++++++ >>> 5 files changed, 496 insertions(+), 4 deletions(-) >>> create mode 100644 protocol/wayland-dmabuf.xml >>> create mode 100644 src/wayland-dmabuf.c >>> create mode 100644 src/wayland-dmabuf.h >>> >>> === Weston === >>> Benjamin Gaignard (2): >>> compositor-drm: allow to be a wl_dmabuf server >>> add simple-dmabuf client >>> >>> clients/Makefile.am | 11 ++ >>> clients/simple-dmabuf.c | 469 >>> +++++++++++++++++++++++++++++++++++++++++++++++ >>> configure.ac | 5 + >>> src/compositor-drm.c | 83 ++++++++- >>> src/compositor.c | 4 +- >>> src/compositor.h | 2 + >>> src/pixman-renderer.c | 93 +++++++--- >>> 7 files changed, 637 insertions(+), 30 deletions(-) >>> create mode 100644 clients/simple-dmabuf.c >>> >>> -- >>> 1.7.9.5 >>> >>> _______________________________________________ >>> wayland-devel mailing list >>> wayland-devel@lists.freedesktop.org >>> http://lists.freedesktop.org/mailman/listinfo/wayland-devel >> >> >> >> >> -- >> Jasper >> >> _______________________________________________ >> wayland-devel mailing list >> wayland-devel@lists.freedesktop.org >> http://lists.freedesktop.org/mailman/listinfo/wayland-devel >> _______________________________________________ wayland-devel mailing list wayland-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/wayland-devel
