[PATCH 3/6] drm/i915: unbind unmappable objects on fault/pin

[Daniel Vetter <daniel.vetter@ffwll.ch>]

In i915_gem_object_pin obviously unbind only if mappable is true.

This is the last part to enable gtt_mappable_end != gtt_size, which
the next patch will do.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/i915/i915_gem.c |   24 ++++++++++++++++++++++--
 1 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 5495ac9..ec571b2 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -153,6 +153,20 @@ i915_gem_create_ioctl(struct drm_device *dev, void *data,
 	return 0;
 }
 
+static bool
+i915_gem_object_cpu_accessible(struct drm_gem_object *obj)
+{
+	struct drm_device *dev = obj->dev;
+	drm_i915_private_t *dev_priv = dev->dev_private;
+	struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
+
+	if (obj_priv->gtt_offset + obj->size > dev_priv->mm.gtt_mappable_end
+			&& obj_priv->gtt_space)
+		return false;
+
+	return true;
+}
+
 static inline int
 fast_shmem_read(struct page **pages,
 		loff_t page_base, int page_offset,
@@ -1172,6 +1186,9 @@ int i915_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 
 	/* Now bind it into the GTT if needed */
 	mutex_lock(&dev->struct_mutex);
+	if (!i915_gem_object_cpu_accessible(obj))
+		i915_gem_object_unbind(obj);
+
 	if (!obj_priv->gtt_space) {
 		ret = i915_gem_object_bind_to_gtt(obj, 0, true);
 		if (ret)
@@ -3197,6 +3214,7 @@ i915_gem_object_pin_and_relocate(struct drm_gem_object *obj,
 	int i, ret;
 	void __iomem *reloc_page;
 	bool need_fence;
+	bool need_mappable = entry->relocation_count ? true : false;
 
 	need_fence = entry->flags & EXEC_OBJECT_NEEDS_FENCE &&
 	             obj_priv->tiling_mode != I915_TILING_NONE;
@@ -3211,7 +3229,8 @@ i915_gem_object_pin_and_relocate(struct drm_gem_object *obj,
 	}
 
 	/* Choose the GTT offset for our buffer and put it there. */
-	ret = i915_gem_object_pin(obj, (uint32_t) entry->alignment, false);
+	ret = i915_gem_object_pin(obj, (uint32_t) entry->alignment,
+				  need_mappable);
 	if (ret)
 		return ret;
 
@@ -4067,7 +4086,8 @@ i915_gem_object_pin(struct drm_gem_object *obj, uint32_t alignment,
 	if (obj_priv->gtt_space != NULL) {
 		if (alignment == 0)
 			alignment = i915_gem_get_gtt_alignment(obj);
-		if (obj_priv->gtt_offset & (alignment - 1)) {
+		if (obj_priv->gtt_offset & (alignment - 1)
+		    || (mappable && !i915_gem_object_cpu_accessible(obj))) {
 			WARN(obj_priv->pin_count,
 			     "bo is already pinned with incorrect alignment:"
 			     " offset=%x, req.alignment=%x\n",
-- 
1.7.1