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commit 62676d10b483a2ff6e8b08c5e7c7d63a831343f5 upstream. This patch changes the way the primary surface is used for dumb framebuffers. Instead of configuring the bo itself as primary surface a shadow bo is created and used instead. Framebuffers can share the shadow bo in case they have the same format and resolution. On atomic plane updates we don't have to update the primary surface in case we pageflip from one framebuffer to another framebuffer which shares the same shadow. This in turn avoids the flicker caused by the primary-destroy + primary-create cycle, which is very annonying when running wayland on qxl. The qxl driver never actually writes to the shadow bo. It sends qxl blit commands which update it though, and the spice server might actually execute them (and thereby write to the shadow) in case the local rendering is kicked for some reason. This happens for example in case qemu is asked to write out a dump of the guest display (screendump monitor command). Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Reviewed-by: Dave Airlie <airlied@redhat.com> Link: http://patchwork.freedesktop.org/patch/msgid/20171019062150.28090-3-kraxel@redhat.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.