drm/i915: Introduce i915_gem_object_create_stolen_for_preallocated

Wrap a preallocated region of stolen memory within an ordinary GEM
object, for example the BIOS framebuffer.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

2 files changed, 70 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 1657d8733648..7f6452b592aa 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1712,6 +1712,11 @@ void i915_gem_stolen_cleanup_compression(struct drm_device *dev);
 void i915_gem_cleanup_stolen(struct drm_device *dev);
 struct drm_i915_gem_object *
 i915_gem_object_create_stolen(struct drm_device *dev, u32 size);
+struct drm_i915_gem_object *
+i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
+                                               u32 stolen_offset,
+                                               u32 gtt_offset,
+                                               u32 size);
 void i915_gem_object_release_stolen(struct drm_i915_gem_object *obj);
 
 /* i915_gem_tiling.c */
diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c
index efaaba5c4194..4aa6d73e6262 100644
--- a/drivers/gpu/drm/i915/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
@@ -312,6 +312,71 @@ i915_gem_object_create_stolen(struct drm_device *dev, u32 size)
         return NULL;
 }
 
+struct drm_i915_gem_object *
+i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
+                                               u32 stolen_offset,
+                                               u32 gtt_offset,
+                                               u32 size)
+{
+        struct drm_i915_private *dev_priv = dev->dev_private;
+        struct drm_i915_gem_object *obj;
+        struct drm_mm_node *stolen;
+
+        if (dev_priv->mm.stolen_base == 0)
+                return NULL;
+
+        DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
+                        stolen_offset, gtt_offset, size);
+
+        /* KISS and expect everything to be page-aligned */
+        BUG_ON(stolen_offset & 4095);
+        BUG_ON(gtt_offset & 4095);
+        BUG_ON(size & 4095);
+
+        if (WARN_ON(size == 0))
+                return NULL;
+
+        stolen = drm_mm_create_block(&dev_priv->mm.stolen,
+                                     stolen_offset, size,
+                                     false);
+        if (stolen == NULL) {
+                DRM_DEBUG_KMS("failed to allocate stolen space\n");
+                return NULL;
+        }
+
+        obj = _i915_gem_object_create_stolen(dev, stolen);
+        if (obj == NULL) {
+                DRM_DEBUG_KMS("failed to allocate stolen object\n");
+                drm_mm_put_block(stolen);
+                return NULL;
+        }
+
+        /* To simplify the initialisation sequence between KMS and GTT,
+         * we allow construction of the stolen object prior to
+         * setting up the GTT space. The actual reservation will occur
+         * later.
+         */
+        if (drm_mm_initialized(&dev_priv->mm.gtt_space)) {
+                obj->gtt_space = drm_mm_create_block(&dev_priv->mm.gtt_space,
+                                                     gtt_offset, size,
+                                                     false);
+                if (obj->gtt_space == NULL) {
+                        DRM_DEBUG_KMS("failed to allocate stolen GTT space\n");
+                        drm_gem_object_unreference(&obj->base);
+                        return NULL;
+                }
+        } else
+                obj->gtt_space = I915_GTT_RESERVED;
+
+        obj->gtt_offset = gtt_offset;
+        obj->has_global_gtt_mapping = 1;
+
+        list_add_tail(&obj->gtt_list, &dev_priv->mm.bound_list);
+        list_add_tail(&obj->mm_list, &dev_priv->mm.inactive_list);
+
+        return obj;
+}
+
 void
 i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
 {