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drm: Add VRAM MM, a simple memory manager for dedicated VRAM

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The VRAM MM memory manager is a helper library that manages dedicated video
memory of simple framebuffer devices. It is supported to be used with
struct drm_gem_vram_object, but does not depend on it.

The implementation is based on the respective code from ast, bochs, and
mgag200. These drivers share the exact same implementation except for type
names. The helpers are currently build with TTM. This may change in future
revisions.

v4:
	* cleanups from checkpatch.pl
v2:
	* renamed to struct drm_vram_mm
	* add drm_vram_mm_mmap() helper
	* documentation fixes

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: http://patchwork.freedesktop.org/patch/msgid/20190508082630.15116-7-tzimmermann@suse.de
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Thomas Zimmermann 2019-05-08 10:26:16 +02:00 • committed by Gerd Hoffmann
parent 1f460b4978
commit 96352eca5c
4 changed files with 293 additions and 2 deletions
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13
Documentation/gpu/drm-mm.rst
View file

@ -79,7 +79,6 @@ count for the TTM, which will call your initialization function.
See the radeon_ttm.c file for an example of usage.
The Graphics Execution Manager (GEM)
====================================
@ -395,6 +394,18 @@ GEM VRAM Helper Functions Reference
.. kernel-doc:: drivers/gpu/drm/drm_gem_vram_helper.c
:export:
VRAM MM Helper Functions Reference
----------------------------------
.. kernel-doc:: drivers/gpu/drm/drm_vram_mm_helper.c
:doc: overview
.. kernel-doc:: include/drm/drm_vram_mm_helper.h
:internal:
.. kernel-doc:: drivers/gpu/drm/drm_vram_mm_helper.c
:export:
VMA Offset Manager
==================