drm/i915: Convert 4096 alignment request to 0 for drm_mm allocations
authorChris Wilson <chris@chris-wilson.co.uk>
Thu, 4 Aug 2016 15:32:26 +0000 (16:32 +0100)
committerChris Wilson <chris@chris-wilson.co.uk>
Thu, 4 Aug 2016 19:19:55 +0000 (20:19 +0100)
commit954c4691218d9e3736dec089c0a5546391c8f3df
treea9a786e798d90854d4270f925c87c2c921ea7d74
parent3b16525cc4c1a43e9053cfdc414356eea24bdfad
drm/i915: Convert 4096 alignment request to 0 for drm_mm allocations

As we always allocate in chunks of 4096 (that being both the PAGE_SIZE
and our own GTT_PAGE_SIZE), we know that all results from the drm_mm are
aligned to at least 4096. The drm_mm allocator itself is optimised for
alignment == 0, and so by converting alignments of 4096 to 0 we can
satisfy our own requirements and still hit the faster path.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1470324762-2545-10-git-send-email-chris@chris-wilson.co.uk
drivers/gpu/drm/i915/i915_gem.c