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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2016-08-04 15:32:26 (GMT) |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2016-08-04 19:19:55 (GMT) |
| commit | 954c4691218d9e3736dec089c0a5546391c8f3df (patch) | |
| tree | a9a786e798d90854d4270f925c87c2c921ea7d74 /drivers/gpu/drm/i915/i915_gem.c | |
| parent | 3b16525cc4c1a43e9053cfdc414356eea24bdfad (diff) | |
| download | linux-954c4691218d9e3736dec089c0a5546391c8f3df.tar.xz | |
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
Diffstat (limited to 'drivers/gpu/drm/i915/i915_gem.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 238d80e..e0e5256 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -3072,6 +3072,15 @@ i915_gem_object_insert_into_vm(struct drm_i915_gem_object *obj, alloc_flag = DRM_MM_CREATE_DEFAULT; } + /* We only allocate in PAGE_SIZE/GTT_PAGE_SIZE (4096) chunks, + * so we know that we always have a minimum alignment of 4096. + * The drm_mm range manager is optimised to return results + * with zero alignment, so where possible use the optimal + * path. + */ + if (alignment <= 4096) + alignment = 0; + search_free: ret = drm_mm_insert_node_in_range_generic(&vm->mm, &vma->node, size, alignment, |