drm/i915: Calculate correct stolen size for GEN7+

[firefly-linux-kernel-4.4.55.git] / drivers / gpu / drm / i915 / i915_gem_gtt.c

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index e74be0c2c6a5145764282b27a6c3c81568ce8675..814ed3ed7790ccfd90b86beeaddfd494ac6fc962 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -512,6 +512,15 @@ static inline unsigned int gen6_get_stolen_size(u16 snb_gmch_ctl)
        return snb_gmch_ctl << 25; /* 32 MB units */
 }
 
+static inline unsigned int gen7_get_stolen_size(u16 snb_gmch_ctl)
+{
+       static const int stolen_decoder[] = {
+               0, 0, 0, 0, 0, 32, 48, 64, 128, 256, 96, 160, 224, 352};
+       snb_gmch_ctl >>= IVB_GMCH_GMS_SHIFT;
+       snb_gmch_ctl &= IVB_GMCH_GMS_MASK;
+       return stolen_decoder[snb_gmch_ctl] << 20;
+}
+
 int i915_gem_gtt_init(struct drm_device *dev)
 {
        struct drm_i915_private *dev_priv = dev->dev_private;
@@ -557,7 +566,10 @@ int i915_gem_gtt_init(struct drm_device *dev)
        pci_read_config_word(dev->pdev, SNB_GMCH_CTRL, &snb_gmch_ctl);
        dev_priv->mm.gtt->gtt_total_entries =
                gen6_get_total_gtt_size(snb_gmch_ctl) / sizeof(gtt_pte_t);
-       dev_priv->mm.gtt->stolen_size = gen6_get_stolen_size(snb_gmch_ctl);
+       if (INTEL_INFO(dev)->gen < 7)
+               dev_priv->mm.gtt->stolen_size = gen6_get_stolen_size(snb_gmch_ctl);
+       else
+               dev_priv->mm.gtt->stolen_size = gen7_get_stolen_size(snb_gmch_ctl);
 
        dev_priv->mm.gtt->gtt_mappable_entries = pci_resource_len(dev->pdev, 2) >> PAGE_SHIFT;
        /* 64/512MB is the current min/max we actually know of, but this is just a