drm/i915: Stash a pointer to the obj's resv in the vma
authorChris Wilson <chris@chris-wilson.co.uk>
Fri, 16 Jun 2017 14:05:25 +0000 (15:05 +0100)
committerChris Wilson <chris@chris-wilson.co.uk>
Fri, 16 Jun 2017 15:54:05 +0000 (16:54 +0100)
commit95ff7c7dd7098860bc131c7dec0ad76ca61e796a
tree5f29c1d63c00587df5ef7894ac7009aa3fe31721
parent7dd4f6729f9243bd7046c6f04c107a456bda38eb
drm/i915: Stash a pointer to the obj's resv in the vma

During execbuf, a mandatory step is that we add this request (this
fence) to each object's reservation_object. Inside execbuf, we track the
vma, and to add the fence to the reservation_object then means having to
first chase the obj, incurring another cache miss. We can reduce the
 number of cache misses by stashing a pointer to the reservation_object
in the vma itself.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170616140525.6394-1-chris@chris-wilson.co.uk
drivers/gpu/drm/i915/i915_gem_execbuffer.c
drivers/gpu/drm/i915/i915_vma.c
drivers/gpu/drm/i915/i915_vma.h