Den 05.07.2019 11.26, skrev Thomas Zimmermann: > This patch changes DRM clients to not map the buffer by default. The > buffer, like any buffer object, should be mapped and unmapped when > needed. > > An unmapped buffer object can be evicted to system memory and does > not consume video ram until displayed. This allows to use generic fbdev > emulation with drivers for low-memory devices, such as ast and mgag200. > > This change affects the generic framebuffer console. HW-based consoles > map their console buffer once and keep it mapped. Userspace can mmap this > buffer into its address space. The shadow-buffered framebuffer console > only needs the buffer object to be mapped during updates. While not being > updated from the shadow buffer, the buffer object can remain unmapped. > Userspace will always mmap the shadow buffer. > > v2: > * change DRM client to not map buffer by default > * manually map client buffer for fbdev with HW framebuffer > > Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx> > --- Reviewed-by: Noralf Trønnes <noralf@xxxxxxxxxxx> _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
