From: Ville Syrjälä Date: Fri, 11 Sep 2015 18:14:29 +0000 (+0300) Subject: drm/i915: Set stolen reserved to 0 for pre-g4x platforms X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=d7884d69a524b92d9770bcdc03df3c5a6120c2d0;p=deliverable%2Flinux.git drm/i915: Set stolen reserved to 0 for pre-g4x platforms This stolen reserved stuff was introduced on g4x, so no need to waste stolen on older platforms. Unfortunately configdb is no more so I can't look up the right way to detect this stuff. I do have one hint as to where the register might be on ctg, but I don't have a ctg to test it, and on the elk I have here it doesn't contain sensible looking data. For ilk grits suggegsts it might be in the same place as on snb (the original PCI reg, not the mirror) but I can't be entirely sure about it The register shows a round zero on my ilk. So when there's no really good data for any of these platforms leave the current "assume 1MiB" approach in place. Cc: Paulo Zanoni Cc: Chris Wilson Signed-off-by: Ville Syrjälä Acked-by: Chris Wilson Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c index f361c4a56995..bf26ecc3781b 100644 --- a/drivers/gpu/drm/i915/i915_gem_stolen.c +++ b/drivers/gpu/drm/i915/i915_gem_stolen.c @@ -281,7 +281,7 @@ static void bdw_get_stolen_reserved(struct drm_i915_private *dev_priv, int i915_gem_init_stolen(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; - unsigned long reserved_total, reserved_base, reserved_size; + unsigned long reserved_total, reserved_base = 0, reserved_size; unsigned long stolen_top; mutex_init(&dev_priv->mm.stolen_lock); @@ -306,6 +306,9 @@ int i915_gem_init_stolen(struct drm_device *dev) case 2: case 3: case 4: + if (!IS_G4X(dev)) + break; + /* fall through */ case 5: /* Assume the gen6 maximum for the older platforms. */ reserved_size = 1024 * 1024;