drm/i915: Remove use on gma_bus_addr on gen6+

We have enough info to not use the intel_gtt bridge stuff.

v2: Move setup of mappable_base above the legacy init stuff because we
still need that on older platforms. (Daniel)

v3: Remove the dev_priv hunk which was rebased in by accident

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.com> (v2)
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_dma.c

@@ -1426,7 +1426,7 @@ static void i915_kick_out_firmware_fb(struct drm_i915_private *dev_priv)
 	if (!ap)
 		return;
 
-	ap->ranges[0].base = dev_priv->mm.gtt->gma_bus_addr;
+	ap->ranges[0].base = dev_priv->gtt.mappable_base;
 	ap->ranges[0].size =
 		dev_priv->mm.gtt->gtt_mappable_entries << PAGE_SHIFT;
 	primary =
@@ -1543,7 +1543,6 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
 	}
 
 	aperture_size = dev_priv->mm.gtt->gtt_mappable_entries << PAGE_SHIFT;
-	dev_priv->gtt.mappable_base = dev_priv->mm.gtt->gma_bus_addr;
 
 	dev_priv->gtt.mappable =
 		io_mapping_create_wc(dev_priv->gtt.mappable_base,

drivers/gpu/drm/i915/i915_gem_gtt.c

@@ -691,6 +691,8 @@ int i915_gem_gtt_init(struct drm_device *dev)
 	u16 snb_gmch_ctl;
 	int ret;
 
+	dev_priv->gtt.mappable_base = pci_resource_start(dev->pdev, 2);
+
 	/* On modern platforms we need not worry ourself with the legacy
 	 * hostbridge query stuff. Skip it entirely
 	 */
@@ -723,7 +725,6 @@ int i915_gem_gtt_init(struct drm_device *dev)
 
 	/* For GEN6+ the PTEs for the ggtt live at 2MB + BAR0 */
 	gtt_bus_addr = pci_resource_start(dev->pdev, 0) + (2<<20);
-	dev_priv->mm.gtt->gma_bus_addr = pci_resource_start(dev->pdev, 2);
 
 	/* i9xx_setup */
 	pci_read_config_word(dev->pdev, SNB_GMCH_CTRL, &snb_gmch_ctl);

drivers/gpu/drm/i915/intel_ringbuffer.c

@@ -1203,7 +1203,7 @@ static int intel_init_ring_buffer(struct drm_device *dev,
 		goto err_unpin;
 
 	ring->virtual_start =
-		ioremap_wc(dev_priv->mm.gtt->gma_bus_addr + obj->gtt_offset,
+		ioremap_wc(dev_priv->gtt.mappable_base + obj->gtt_offset,
 			   ring->size);
 	if (ring->virtual_start == NULL) {
 		DRM_ERROR("Failed to map ringbuffer.\n");