From: Chris Wilson <ch...@chris-wilson.co.uk>
Wrap a preallocated region of stolen memory within an ordinary GEM
object, for example the BIOS framebuffer.
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_drv.h | 5 +++
drivers/gpu/drm/i915/i915_gem_stolen.c | 65 ++++++++++++++++++++++++++++++++
2 files changed, 70 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index e95337c..9b5478f 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1717,6 +1717,11 @@ 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 9f01332..7f1735c 100644
--- a/drivers/gpu/drm/i915/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
@@ -309,6 +309,71 @@ 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)
{
--
1.7.9.5
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/intel-gfx
