[PATCH 3/5] drm/i915: Extract gen6 aliasing ppgtt code

[Ben Widawsky <ben@bwidawsk.net>]

This refactor clearly identifies the GEN specific portion of the aliased
ppgtt code. Aside from some of the gen specific parts being extracted,
it also preps us for an upcoming patch that pulls out the size, which
has some nice benefits.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
---
 drivers/gpu/drm/i915/i915_gem_gtt.c | 51 ++++++++++++++++++++++---------------
 1 file changed, 30 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 94d21aa..3b1bff1 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -108,29 +108,20 @@ static void i915_ppgtt_clear_range(struct i915_hw_ppgtt *ppgtt,
 	}
 }
 
-static int i915_gem_init_aliasing_ppgtt(struct drm_device *dev)
+static int gen6_init_aliasing_ppgtt(struct i915_hw_ppgtt *ppgtt)
 {
+	struct drm_device *dev = ppgtt->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
-	struct i915_hw_ppgtt *ppgtt;
 	unsigned first_pd_entry_in_global_pt;
-	int i;
-	int ret = -ENOMEM;
+	int i, ret = -ENOMEM;
 
 	/* ppgtt PDEs reside in the global gtt pagetable, which has 512*1024
 	 * entries. For aliasing ppgtt support we just steal them at the end for
 	 * now. */
 	first_pd_entry_in_global_pt = dev_priv->mm.gtt->gtt_total_entries - I915_PPGTT_PD_ENTRIES;
-
-	ppgtt = kzalloc(sizeof(*ppgtt), GFP_KERNEL);
-	if (!ppgtt)
-		return ret;
-
-	ppgtt->dev = dev;
 	ppgtt->num_pd_entries = I915_PPGTT_PD_ENTRIES;
 	ppgtt->pt_pages = kzalloc(sizeof(struct page *)*ppgtt->num_pd_entries,
 				  GFP_KERNEL);
-	if (!ppgtt->pt_pages)
-		goto err_ppgtt;
 
 	for (i = 0; i < ppgtt->num_pd_entries; i++) {
 		ppgtt->pt_pages[i] = alloc_page(GFP_KERNEL);
@@ -152,8 +143,7 @@ static int i915_gem_init_aliasing_ppgtt(struct drm_device *dev)
 					       0, 4096,
 					       PCI_DMA_BIDIRECTIONAL);
 
-			if (pci_dma_mapping_error(dev->pdev,
-						  pt_addr)) {
+			if (pci_dma_mapping_error(dev->pdev, pt_addr)) {
 				ret = -EIO;
 				goto err_pd_pin;
 
@@ -162,15 +152,11 @@ static int i915_gem_init_aliasing_ppgtt(struct drm_device *dev)
 		}
 	}
 
-	ppgtt->scratch_page_dma_addr = dev_priv->mm.gtt->scratch_page_dma;
-
 	i915_ppgtt_clear_range(ppgtt, 0,
 			       ppgtt->num_pd_entries*I915_PPGTT_PT_ENTRIES);
 
 	ppgtt->pd_offset = (first_pd_entry_in_global_pt)*sizeof(gtt_pte_t);
 
-	dev_priv->mm.aliasing_ppgtt = ppgtt;
-
 	return 0;
 
 err_pd_pin:
@@ -185,9 +171,32 @@ err_pt_alloc:
 		if (ppgtt->pt_pages[i])
 			__free_page(ppgtt->pt_pages[i]);
 	}
-	kfree(ppgtt->pt_pages);
-err_ppgtt:
-	kfree(ppgtt);
+
+	if (!ppgtt->pt_pages)
+		kfree(ppgtt->pt_pages);
+
+	return ret;
+}
+
+
+static int i915_gem_init_aliasing_ppgtt(struct drm_device *dev)
+{
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct i915_hw_ppgtt *ppgtt;
+	int ret = -ENOMEM;
+
+	ppgtt = kzalloc(sizeof(*ppgtt), GFP_KERNEL);
+	if (!ppgtt)
+		return ret;
+
+	ppgtt->dev = dev;
+	ppgtt->scratch_page_dma_addr = dev_priv->mm.gtt->scratch_page_dma;
+
+	ret = gen6_init_aliasing_ppgtt(ppgtt);
+	if (ret)
+		kfree(ppgtt);
+	else
+		dev_priv->mm.aliasing_ppgtt = ppgtt;
 
 	return ret;
 }
-- 
1.8.0.2