drm/i915: Add probe and remove to the gtt ops

The idea, and much of the code came originally from:

commit 0712f0249c3148d8cf42a3703403c278590d4de5
Author: Ben Widawsky <ben@bwidawsk.net>
Date:   Fri Jan 18 17:23:16 2013 -0800

    drm/i915: Create a vtable for i915 gtt

Daniel didn't like the color of that patch series, and so I asked him to
start something which appealed to his sense of color. The preceding
patches are those, and now this is going on top of that.

[extracted from the original commit message]

One immediately obvious thing to implement is our gmch probing. The init
function was getting massively bloated. Fundamentally, all that's needed
from GMCH probing is the GTT size, and the stolen size. It makes design
sense to put the mappable calculation in there as well, but the code
turns out a bit nicer without it (IMO)

The intel_gtt bridge thing is still here, but the subsequent patches
will finish ripping that out.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
[danvet: Bikeshedded one comment (GMADR is just the PCI aperture, we
use it for other things than just accessing tiled surfaces through a
linear view) and cut the newly added long lines a bit. Also one
checkpatch error.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 109 insertions, 77 deletions

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 55020676474..87249e8cd4a 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -707,14 +707,14 @@ static inline unsigned int gen6_get_total_gtt_size(u16 snb_gmch_ctl)
 	return snb_gmch_ctl << 20;
 }
 
-static inline unsigned int gen6_get_stolen_size(u16 snb_gmch_ctl)
+static inline size_t gen6_get_stolen_size(u16 snb_gmch_ctl)
 {
 	snb_gmch_ctl >>= SNB_GMCH_GMS_SHIFT;
 	snb_gmch_ctl &= SNB_GMCH_GMS_MASK;
 	return snb_gmch_ctl << 25; /* 32 MB units */
 }
 
-static inline unsigned int gen7_get_stolen_size(u16 snb_gmch_ctl)
+static inline size_t 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};
@@ -723,109 +723,141 @@ static inline unsigned int gen7_get_stolen_size(u16 snb_gmch_ctl)
 	return stolen_decoder[snb_gmch_ctl] << 20;
 }
 
-int i915_gem_gtt_init(struct drm_device *dev)
+static int gen6_gmch_probe(struct drm_device *dev,
+			   size_t *gtt_total,
+			   size_t *stolen)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	phys_addr_t gtt_bus_addr;
+	unsigned int gtt_size;
 	u16 snb_gmch_ctl;
 	int ret;
 
-	dev_priv->gtt.mappable_base = pci_resource_start(dev->pdev, 2);
-	dev_priv->gtt.mappable_end = pci_resource_len(dev->pdev, 2);
-
-	/* On modern platforms we need not worry ourself with the legacy
-	 * hostbridge query stuff. Skip it entirely
+	/* 64/512MB is the current min/max we actually know of, but this is just
+	 * a coarse sanity check.
 	 */
-	if (INTEL_INFO(dev)->gen < 6) {
-		ret = intel_gmch_probe(dev_priv->bridge_dev, dev->pdev, NULL);
-		if (!ret) {
-			DRM_ERROR("failed to set up gmch\n");
-			return -EIO;
-		}
-
-		dev_priv->mm.gtt = intel_gtt_get();
-		if (!dev_priv->mm.gtt) {
-			DRM_ERROR("Failed to initialize GTT\n");
-			intel_gmch_remove();
-			return -ENODEV;
-		}
-
-		dev_priv->gtt.do_idle_maps = needs_idle_maps(dev);
-
-		dev_priv->gtt.gtt_clear_range = i915_ggtt_clear_range;
-		dev_priv->gtt.gtt_insert_entries = i915_ggtt_insert_entries;
-
-		return 0;
+	if ((dev_priv->gtt.mappable_end < (64<<20) ||
+	     (dev_priv->gtt.mappable_end > (512<<20)))) {
+		DRM_ERROR("Unknown GMADR size (%lx)\n",
+			  dev_priv->gtt.mappable_end);
+		return -ENXIO;
 	}
 
 	if (!pci_set_dma_mask(dev->pdev, DMA_BIT_MASK(40)))
 		pci_set_consistent_dma_mask(dev->pdev, DMA_BIT_MASK(40));
-
-	dev_priv->mm.gtt = kzalloc(sizeof(*dev_priv->mm.gtt), GFP_KERNEL);
-	if (!dev_priv->mm.gtt)
-		return -ENOMEM;
-
-	/* For GEN6+ the PTEs for the ggtt live at 2MB + BAR0 */
-	gtt_bus_addr = pci_resource_start(dev->pdev, 0) + (2<<20);
-
-	/* i9xx_setup */
 	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);
-	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);
+	gtt_size = gen6_get_total_gtt_size(snb_gmch_ctl);
 
-	/* 64/512MB is the current min/max we actually know of, but this is just a
-	 * coarse sanity check.
-	 */
-	if ((dev_priv->gtt.mappable_end < (64<<20) ||
-	    (dev_priv->gtt.mappable_end > (512<<20)))) {
-		DRM_ERROR("Unknown GMADR size (%lx)\n",
-			  dev_priv->gtt.mappable_end);
-		ret = -ENXIO;
-		goto err_out;
-	}
+	if (IS_GEN7(dev))
+		*stolen = gen7_get_stolen_size(snb_gmch_ctl);
+	else
+		*stolen = gen6_get_stolen_size(snb_gmch_ctl);
 
-	ret = setup_scratch_page(dev);
-	if (ret) {
-		DRM_ERROR("Scratch setup failed\n");
-		goto err_out;
-	}
+	*gtt_total = (gtt_size / sizeof(gtt_pte_t)) << PAGE_SHIFT;
 
-	dev_priv->gtt.gsm = ioremap_wc(gtt_bus_addr,
-				       dev_priv->mm.gtt->gtt_total_entries * sizeof(gtt_pte_t));
+	/* For GEN6+ the PTEs for the ggtt live at 2MB + BAR0 */
+	gtt_bus_addr = pci_resource_start(dev->pdev, 0) + (2<<20);
+	dev_priv->gtt.gsm = ioremap_wc(gtt_bus_addr, gtt_size);
 	if (!dev_priv->gtt.gsm) {
 		DRM_ERROR("Failed to map the gtt page table\n");
-		teardown_scratch_page(dev);
-		ret = -ENOMEM;
-		goto err_out;
+		return -ENOMEM;
 	}
 
-	/* GMADR is the PCI aperture used by SW to access tiled GFX surfaces in a linear fashion. */
-	DRM_INFO("Memory usable by graphics device = %dM\n", dev_priv->mm.gtt->gtt_total_entries >> 8);
-	DRM_DEBUG_DRIVER("GMADR size = %ldM\n", dev_priv->gtt.mappable_end >> 20);
-	DRM_DEBUG_DRIVER("GTT stolen size = %dM\n", dev_priv->mm.gtt->stolen_size >> 20);
+	ret = setup_scratch_page(dev);
+	if (ret)
+		DRM_ERROR("Scratch setup failed\n");
 
 	dev_priv->gtt.gtt_clear_range = gen6_ggtt_clear_range;
 	dev_priv->gtt.gtt_insert_entries = gen6_ggtt_insert_entries;
 
-	return 0;
-
-err_out:
-	kfree(dev_priv->mm.gtt);
-	if (INTEL_INFO(dev)->gen < 6)
-		intel_gmch_remove();
 	return ret;
 }
 
-void i915_gem_gtt_fini(struct drm_device *dev)
+void gen6_gmch_remove(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	iounmap(dev_priv->gtt.gsm);
-	teardown_scratch_page(dev);
-	if (INTEL_INFO(dev)->gen < 6)
-		intel_gmch_remove();
+	teardown_scratch_page(dev_priv->dev);
 	kfree(dev_priv->mm.gtt);
 }
+
+static int i915_gmch_probe(struct drm_device *dev,
+			   size_t *gtt_total,
+			   size_t *stolen)
+{
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	int ret;
+
+	/* This is a temporary hack to make the code cleaner in
+	 * i915_gem_gtt_init. I promise it will go away very shortly. */
+	kfree(dev_priv->mm.gtt);
+
+	ret = intel_gmch_probe(dev_priv->bridge_dev, dev_priv->dev->pdev, NULL);
+	if (!ret) {
+		DRM_ERROR("failed to set up gmch\n");
+		return -EIO;
+	}
+
+	dev_priv->mm.gtt = intel_gtt_get();
+	if (!dev_priv->mm.gtt) {
+		DRM_ERROR("Failed to initialize GTT\n");
+		intel_gmch_remove();
+		return -ENODEV;
+	}
+
+	dev_priv->gtt.do_idle_maps = needs_idle_maps(dev_priv->dev);
+	dev_priv->gtt.gtt_clear_range = i915_ggtt_clear_range;
+	dev_priv->gtt.gtt_insert_entries = i915_ggtt_insert_entries;
+
+	return 0;
+}
+
+static void i915_gmch_remove(struct drm_device *dev)
+{
+	intel_gmch_remove();
+}
+
+int i915_gem_gtt_init(struct drm_device *dev)
+{
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct i915_gtt *gtt = &dev_priv->gtt;
+	unsigned long gtt_size;
+	int ret;
+
+	dev_priv->mm.gtt = kzalloc(sizeof(*dev_priv->mm.gtt), GFP_KERNEL);
+	if (!dev_priv->mm.gtt)
+		return -ENOMEM;
+
+	gtt->mappable_base = pci_resource_start(dev->pdev, 2);
+	gtt->mappable_end = pci_resource_len(dev->pdev, 2);
+
+	if (INTEL_INFO(dev)->gen <= 5) {
+		dev_priv->gtt.gtt_probe = i915_gmch_probe;
+		dev_priv->gtt.gtt_remove = i915_gmch_remove;
+	} else {
+		dev_priv->gtt.gtt_probe = gen6_gmch_probe;
+		dev_priv->gtt.gtt_remove = gen6_gmch_remove;
+	}
+
+	ret = dev_priv->gtt.gtt_probe(dev, &dev_priv->gtt.total,
+				     &dev_priv->gtt.stolen_size);
+	if (ret) {
+		kfree(dev_priv->mm.gtt);
+		return ret;
+	}
+
+	dev_priv->mm.gtt->gtt_total_entries = dev_priv->gtt.total >> PAGE_SHIFT;
+	dev_priv->mm.gtt->stolen_size = dev_priv->gtt.stolen_size;
+
+	gtt_size = (dev_priv->gtt.total >> PAGE_SHIFT) * sizeof(gtt_pte_t);
+
+	/* GMADR is the PCI mmio aperture into the global GTT. */
+	DRM_INFO("Memory usable by graphics device = %zdM\n",
+		 dev_priv->gtt.total >> 20);
+	DRM_DEBUG_DRIVER("GMADR size = %ldM\n",
+			 dev_priv->gtt.mappable_end >> 20);
+	DRM_DEBUG_DRIVER("GTT stolen size = %zdM\n",
+			 dev_priv->gtt.stolen_size >> 20);
+
+	return 0;
+}