From: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Sun, 25 Mar 2012 17:47:39 +0000 (+0200)
Subject: drm/i915: use uncached writes in pwrite
X-Git-Url: http://git.mmlx.us/?a=commitdiff_plain;h=117babcdd51ed8a9bb8d4921b292918acb6e0d70;p=linux-edison.git

drm/i915: use uncached writes in pwrite

It's around 20% faster.

Tested-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 7f33e6af6ec..c84060ce6bf 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -642,9 +642,9 @@ i915_gem_shmem_pwrite(struct drm_device *dev,
 			if (partial_cacheline_write)
 				drm_clflush_virt_range(vaddr + shmem_page_offset,
 						       page_length);
-			ret = __copy_from_user_inatomic(vaddr + shmem_page_offset,
-							user_data,
-							page_length);
+			ret = __copy_from_user_inatomic_nocache(vaddr + shmem_page_offset,
+								user_data,
+								page_length);
 			if (needs_clflush_after)
 				drm_clflush_virt_range(vaddr + shmem_page_offset,
 						       page_length);