From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Tue, 26 Sep 2017 09:53:53 +0000 (+0100)
Subject: drm/i915: Use memset64() to prefill the GTT page
X-Git-Tag: v4.19~298^2~46^2~1516
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=4dd504f7d98a6719eb2fc1a400257ca1f13d344b;p=platform%2Fkernel%2Flinux-rpi3.git

drm/i915: Use memset64() to prefill the GTT page

Take advantage of optimised memset64() instead of open coding it to
prefill the GTT pages.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20170926095353.11036-1-chris@chris-wilson.co.uk
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
---

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 64d7852..4c82ceb 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -481,10 +481,8 @@ static void fill_page_dma(struct i915_address_space *vm,
 			  const u64 val)
 {
 	u64 * const vaddr = kmap_atomic(p->page);
-	int i;
 
-	for (i = 0; i < 512; i++)
-		vaddr[i] = val;
+	memset64(vaddr, val, PAGE_SIZE / sizeof(val));
 
 	kunmap_atomic(vaddr);
 }