drm/vram: Implement lazy unmapping for GEM VRAM buffers

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Frequent mapping and unmapping a buffer object adds overhead for
modifying the page table and creates debug output. Unmapping a buffer
is only required when the memory manager evicts the buffer from its
current location.

v4:
	* WARN_ON if buffer is still mapped during BO cleanup

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reported-and-tested-by: Davidlohr Bueso <dbueso@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20190906122056.32018-5-tzimmermann@suse.de

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This commit is contained in:

Thomas Zimmermann 2019-09-06 14:20:56 +02:00

parent f3309105b8

commit 2236439bc6

2 changed files with 45 additions and 8 deletions

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49

drivers/gpu/drm/drm_gem_vram_helper.c

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4

include/drm/drm_gem_vram_helper.h

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