Oleksandr Andrushchenko 4394e96423 drm/xen-front: Remove CMA support ... It turns out this was only needed to paper over a bug in the CMA helpers, which was addressed in commit 998fb1a0f4 Author: Liviu Dudau <Liviu.Dudau@arm.com> Date: Fri Nov 10 13:33:10 2017 +0000 drm: gem_cma_helper.c: Allow importing of contiguous scatterlists with nents > 1 Without this the following pipeline didn't work: domU: 1. xen-front allocates a non-contig buffer 2. creates grants out of it dom0: 3. converts the grants into a dma-buf. Since they're non-contig, the scatter-list is huge. 4. imports it into rcar-du, which requires dma-contig memory for scanout. -> On this given platform there's an IOMMU, so in theory this should work. But in practice this failed, because of the huge number of sg entries, even though the IOMMU driver mapped it all into a dma-contig range. With a guest-contig buffer allocated in step 1, this problem doesn't exist. But there's technically no reason to require guest-contig memory for xen buffer sharing using grants. Given all that, the xen-front cma support is not needed and should be removed. Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20180417074012.21311-1-andr2000@gmail.com		2018-04-18 10:18:27 +03:00
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Kconfig	drm/xen-front: Remove CMA support	2018-04-18 10:18:27 +03:00
Makefile
xen_drm_front_cfg.c
xen_drm_front_cfg.h
xen_drm_front_conn.c
xen_drm_front_conn.h
xen_drm_front_evtchnl.c
xen_drm_front_evtchnl.h
xen_drm_front_gem.c
xen_drm_front_gem.h
xen_drm_front_kms.c
xen_drm_front_kms.h
xen_drm_front_shbuf.c
xen_drm_front_shbuf.h
xen_drm_front.c
xen_drm_front.h