5 Sep
2019
5 Sep
'19
6:18 a.m.
On Wed, Sep 04, 2019 at 01:56:42PM +0200, Thomas Zimmermann wrote:
The kmap and kunmap operations of GEM VRAM buffers can now be called in interleaving pairs. The first call to drm_gem_vram_kmap() maps the buffer's memory to kernel address space and the final call to drm_gem_vram_kunmap() unmaps the memory. Intermediate calls to these functions increment or decrement a reference counter.
This change allows for keeping buffer memory mapped for longer and minimizes the amount of changes to TLB, page tables, etc.
Signed-off-by: Thomas Zimmermann tzimmermann@suse.de Cc: Davidlohr Bueso dave@stgolabs.net
Reviewed-by: Gerd Hoffmann kraxel@redhat.com