drm/vmwgfx: Add a cpu blit utility that can be used for page-backed bos

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The utility uses kmap_atomic() instead of vmapping the whole buffer
object. As a result there will be more book-keeping but on some
architectures this will help avoid exhausting vmalloc space and also
avoid expensive TLB flushes.

The blit utility also adds a provision to compute a bounding box of
changed content, which is very useful to optimize presentation speed
of ill-behaved applications that don't supply proper damage regions, and
for page-flips. The cost of computing the bounding box is not that
expensive when done in a cpu-blit utility like this.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Brian Paul <brianp@vmware.com>

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Thomas Hellstrom 2018-01-16 09:33:27 +01:00

parent 9c11fcf1a7

commit 79273e1b7e

3 changed files with 555 additions and 1 deletions

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2

drivers/gpu/drm/vmwgfx/Makefile

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506

drivers/gpu/drm/vmwgfx/vmwgfx_blit.c

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48

drivers/gpu/drm/vmwgfx/vmwgfx_drv.h

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