From 14daa63b277b73a91ca084acee9e31365c7283e9 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Mon, 22 Aug 2016 08:44:29 +0100 Subject: [PATCH] drm/i915: Stop marking the unaccessible scratch page as UC Since by design, if not entirely by practice, nothing is allowed to access the scratch page we use to background fill the VM, then we do not need to ensure that it is coherent between the CPU and GPU. set_pages_uc() does a stop_machine() after changing the PAT, and that significantly impacts upon context creation throughput. Signed-off-by: Chris Wilson Link: http://patchwork.freedesktop.org/patch/msgid/20160822074431.26872-1-chris@chris-wilson.co.uk Reviewed-by: Joonas Lahtinen --- drivers/gpu/drm/i915/i915_gem_gtt.c | 4 ---- 1 file changed, 4 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c index b90fdcee992a..b3cd9e21c8da 100644 --- a/drivers/gpu/drm/i915/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c @@ -422,16 +422,12 @@ static struct i915_page_scratch *alloc_scratch_page(struct drm_device *dev) return ERR_PTR(ret); } - set_pages_uc(px_page(sp), 1); - return sp; } static void free_scratch_page(struct drm_device *dev, struct i915_page_scratch *sp) { - set_pages_wb(px_page(sp), 1); - cleanup_px(dev, sp); kfree(sp); } -- 2.30.2