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drm/i915: Introduce i915_gem_object_create_stolen_for_preallocated

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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>
This commit is contained in:
Chris Wilson 2013-02-19 13:31:37 -08:00 committed by Daniel Vetter
parent f9c513e9d6
commit 866d12b4ee
2 changed files with 70 additions and 0 deletions
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5
drivers/gpu/drm/i915/i915_drv.h
View File

@ -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 */

65
drivers/gpu/drm/i915/i915_gem_stolen.c
View File

@ -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)
{