From 3a2ffb65eec6dbda2fd8151894f51c18b42c8d41 Mon Sep 17 00:00:00 2001 From: Ben Widawsky Date: Thu, 7 Nov 2013 21:40:51 -0800 Subject: [PATCH] drm/i915/bdw: Limit GTT to 2GB Because of the way in which we're allocating the pages for the Aliasing PPGTT, we cannot actually successfully alloc enough space for anything greater than 2GB. Instead of a quick hack to fix this, we should defer until we have the real solution in place (allocating much less contiguous space). This wasn't found sooner because we didn't not have any systems supporting more than a 2GB GTT. Signed-off-by: Ben Widawsky Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_gem_gtt.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c index 5a3cc31..f69bdc7 100644 --- a/drivers/gpu/drm/i915/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c @@ -1239,6 +1239,11 @@ static inline unsigned int gen8_get_total_gtt_size(u16 bdw_gmch_ctl) bdw_gmch_ctl &= BDW_GMCH_GGMS_MASK; if (bdw_gmch_ctl) bdw_gmch_ctl = 1 << bdw_gmch_ctl; + if (bdw_gmch_ctl > 4) { + WARN_ON(!i915_preliminary_hw_support); + return 4<<20; + } + return bdw_gmch_ctl << 20; } -- 2.7.4