From 4d3e904ceb46bc91d68a47be930514b383227a87 Mon Sep 17 00:00:00 2001 From: Wayne Boyer Date: Tue, 8 Dec 2015 09:38:52 -0800 Subject: [PATCH] drm/i915: Only set gem object L3 cache level for IVB devices MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Do some further clean up based on the initial review of drm/i915: Separate cherryview from valleyview. In this case, in i915_gem_alloc_context_obj() only call i915_gem_object_set_cache_level() for Ivy Bridge devices since later platforms don't have L3 control bits in the PTE. v2: Expand comment to mention snooping requirement. (Ville, Imre) Cc: Ville Syrjälä Cc: Rodrigo Vivi Signed-off-by: Wayne Boyer Signed-off-by: Daniel Vetter Link: http://patchwork.freedesktop.org/patch/msgid/1449596332-23470-1-git-send-email-wayne.boyer@intel.com Reviewed-by: Ville Syrjälä --- drivers/gpu/drm/i915/i915_gem_context.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c index 4b1161dcb15c..900ffd044db8 100644 --- a/drivers/gpu/drm/i915/i915_gem_context.c +++ b/drivers/gpu/drm/i915/i915_gem_context.c @@ -189,8 +189,15 @@ i915_gem_alloc_context_obj(struct drm_device *dev, size_t size) * shouldn't touch the cache level, especially as that * would make the object snooped which might have a * negative performance impact. + * + * Snooping is required on non-llc platforms in execlist + * mode, but since all GGTT accesses use PAT entry 0 we + * get snooping anyway regardless of cache_level. + * + * This is only applicable for Ivy Bridge devices since + * later platforms don't have L3 control bits in the PTE. */ - if (INTEL_INFO(dev)->gen >= 7 && !IS_VALLEYVIEW(dev) && !IS_CHERRYVIEW(dev)) { + if (IS_IVYBRIDGE(dev)) { ret = i915_gem_object_set_cache_level(obj, I915_CACHE_L3_LLC); /* Failure shouldn't ever happen this early */ if (WARN_ON(ret)) { -- 2.20.1