drm/i915: Remove scratch page from shared

We already had a mapping in both (minus the phys_addr in AGP).
Reviewed-by: NRodrigo Vivi <rodrigo.vivi@gmail.com>
Signed-off-by: NBen Widawsky <ben@bwidawsk.net>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/char/agp/intel-gtt.c

@@ -75,6 +75,7 @@ static struct _intel_private {
 	struct resource ifp_resource;
 	int resource_valid;
 	struct page *scratch_page;
+	phys_addr_t scratch_page_dma;
 	int refcount;
 } intel_private;
 
@@ -297,9 +298,9 @@ static int intel_gtt_setup_scratch_page(void)
 		if (pci_dma_mapping_error(intel_private.pcidev, dma_addr))
 			return -EINVAL;
 
-		intel_private.base.scratch_page_dma = dma_addr;
+		intel_private.scratch_page_dma = dma_addr;
 	} else
-		intel_private.base.scratch_page_dma = page_to_phys(page);
+		intel_private.scratch_page_dma = page_to_phys(page);
 
 	intel_private.scratch_page = page;
 
@@ -546,7 +547,7 @@ static unsigned int intel_gtt_mappable_entries(void)
 static void intel_gtt_teardown_scratch_page(void)
 {
 	set_pages_wb(intel_private.scratch_page, 1);
-	pci_unmap_page(intel_private.pcidev, intel_private.base.scratch_page_dma,
+	pci_unmap_page(intel_private.pcidev, intel_private.scratch_page_dma,
 		       PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
 	put_page(intel_private.scratch_page);
 	__free_page(intel_private.scratch_page);
@@ -891,7 +892,7 @@ void intel_gtt_clear_range(unsigned int first_entry, unsigned int num_entries)
 	unsigned int i;
 
 	for (i = first_entry; i < (first_entry + num_entries); i++) {
-		intel_private.driver->write_entry(intel_private.base.scratch_page_dma,
+		intel_private.driver->write_entry(intel_private.scratch_page_dma,
 						  i, 0);
 	}
 	readl(intel_private.gtt+i-1);

drivers/gpu/drm/i915/i915_drv.h

@@ -383,6 +383,8 @@ struct i915_gtt {
 	void __iomem *gsm;
 
 	bool do_idle_maps;
+	dma_addr_t scratch_page_dma;
+	struct page *scratch_page;
 };
 
 #define I915_PPGTT_PD_ENTRIES 512

drivers/gpu/drm/i915/i915_gem_gtt.c

@@ -162,7 +162,7 @@ int i915_gem_init_aliasing_ppgtt(struct drm_device *dev)
 		}
 	}
 
-	ppgtt->scratch_page_dma_addr = dev_priv->mm.gtt->scratch_page_dma;
+	ppgtt->scratch_page_dma_addr = dev_priv->gtt.scratch_page_dma;
 
 	i915_ppgtt_clear_range(ppgtt, 0,
 			       ppgtt->num_pd_entries*I915_PPGTT_PT_ENTRIES);
@@ -396,7 +396,7 @@ static void i915_ggtt_clear_range(struct drm_device *dev,
 		 first_entry, num_entries, max_entries))
 		num_entries = max_entries;
 
-	scratch_pte = pte_encode(dev, dev_priv->mm.gtt->scratch_page_dma, I915_CACHE_LLC);
+	scratch_pte = pte_encode(dev, dev_priv->gtt.scratch_page_dma, I915_CACHE_LLC);
 	for (i = 0; i < num_entries; i++)
 		iowrite32(scratch_pte, &gtt_base[i]);
 	readl(gtt_base);
@@ -659,8 +659,8 @@ static int setup_scratch_page(struct drm_device *dev)
 #else
 	dma_addr = page_to_phys(page);
 #endif
-	dev_priv->mm.gtt->scratch_page = page;
-	dev_priv->mm.gtt->scratch_page_dma = dma_addr;
+	dev_priv->gtt.scratch_page = page;
+	dev_priv->gtt.scratch_page_dma = dma_addr;
 
 	return 0;
 }
@@ -668,11 +668,11 @@ static int setup_scratch_page(struct drm_device *dev)
 static void teardown_scratch_page(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
-	set_pages_wb(dev_priv->mm.gtt->scratch_page, 1);
-	pci_unmap_page(dev->pdev, dev_priv->mm.gtt->scratch_page_dma,
+	set_pages_wb(dev_priv->gtt.scratch_page, 1);
+	pci_unmap_page(dev->pdev, dev_priv->gtt.scratch_page_dma,
 		       PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
-	put_page(dev_priv->mm.gtt->scratch_page);
-	__free_page(dev_priv->mm.gtt->scratch_page);
+	put_page(dev_priv->gtt.scratch_page);
+	__free_page(dev_priv->gtt.scratch_page);
 }
 
 static inline unsigned int gen6_get_total_gtt_size(u16 snb_gmch_ctl)

include/drm/intel-gtt.h

@@ -13,9 +13,6 @@ struct intel_gtt {
 	unsigned int gtt_mappable_entries;
 	/* Whether i915 needs to use the dmar apis or not. */
 	unsigned int needs_dmar : 1;
-	/* Share the scratch page dma with ppgtts. */
-	dma_addr_t scratch_page_dma;
-	struct page *scratch_page;
 	/* needed for ioremap in drm/i915 */
 	phys_addr_t gma_bus_addr;
 } *intel_gtt_get(void);