drm/udl: Switch to SHMEM

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Udl's GEM code and the generic SHMEM are almost identical. Replace
the former with SHMEM. The dmabuf support in udl is being replaced
with generic GEM PRIME functions.

The main difference is in the caching flags for mmap pages. By
default, SHMEM always sets (uncached) write combining. In udl's
memory management code, only imported buffers use write combining.
Memory pages of locally created buffer objects are mmap'ed with
caching enabled. To keep the optimization, udl provides its own
mmap function for GEM objects where it fixes up the mapping flags.

v3:
	- restore udl vmap that enables caching
v2:
	- remove obsolete code in a separate patch

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191107094307.19870-4-tzimmermann@suse.de

...

This commit is contained in:

Thomas Zimmermann 2019-11-07 10:43:06 +01:00

parent 1d48b9e988

commit 08b22f65b3

5 changed files with 138 additions and 60 deletions

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1

drivers/gpu/drm/udl/Kconfig

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29

drivers/gpu/drm/udl/udl_drv.c

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1

drivers/gpu/drm/udl/udl_drv.h

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66

drivers/gpu/drm/udl/udl_fb.c

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101

drivers/gpu/drm/udl/udl_gem.c

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