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struct drm_i915_gem_object *

kos_gem_fb_object_create(struct drm_device *dev,

                           u32 gtt_offset,

                           u32 size)

{

    struct drm_i915_private *dev_priv = dev->dev_private;

    struct i915_address_space *ggtt = &dev_priv->gtt.base;

    struct drm_i915_gem_object *obj;

    struct drm_mm_node *fb_node;

    struct i915_vma *vma;

    int ret;

    DRM_DEBUG_KMS("creating preallocated framebuffer object: gtt_offset=%x, size=%x\n",

                  gtt_offset, size);

    /* KISS and expect everything to be page-aligned */

    BUG_ON(size & 4095);

    if (WARN_ON(size == 0))

        return NULL;

    fb_node = kzalloc(sizeof(*fb_node), GFP_KERNEL);

    if (!fb_node)

        return NULL;

    fb_node->start = gtt_offset;

    fb_node->size = size;

    obj = _kos_fb_object_create(dev, fb_node);

    if (obj == NULL) {

        DRM_DEBUG_KMS("failed to preallocate framebuffer object\n");

        kfree(fb_node);

        return NULL;

    }

    vma = i915_gem_obj_lookup_or_create_vma(obj, ggtt);

    if (IS_ERR(vma)) {

        ret = PTR_ERR(vma);

        goto err_out;

    }

    /* 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.

     */

    vma->node.start = gtt_offset;

    vma->node.size = size;

    if (drm_mm_initialized(&ggtt->mm)) {

        ret = drm_mm_reserve_node(&ggtt->mm, &vma->node);

        if (ret) {

            DRM_DEBUG_KMS("failed to allocate framebuffer GTT space\n");

            goto err_vma;

        }

    }

//    obj->has_global_gtt_mapping = 1;

    list_add_tail(&obj->global_list, &dev_priv->mm.bound_list);

    list_add_tail(&vma->mm_list, &ggtt->inactive_list);

    mutex_lock(&dev->object_name_lock);

    idr_preload(GFP_KERNEL);

    if (!obj->base.name) {

        ret = idr_alloc(&dev->object_name_idr, &obj->base, 1, 0, GFP_NOWAIT);

        if (ret < 0)

            goto err_gem;

        obj->base.name = ret;

        /* Allocate a reference for the name table.  */

        drm_gem_object_reference(&obj->base);

        DRM_DEBUG_KMS("%s allocate fb name %d\n", __FUNCTION__, obj->base.name );

    }

    idr_preload_end();

    mutex_unlock(&dev->object_name_lock);

    drm_gem_object_unreference(&obj->base);

    return obj;

err_gem:

    idr_preload_end();

    mutex_unlock(&dev->object_name_lock);

err_vma:

    i915_gem_vma_destroy(vma);

err_out:

    kfree(fb_node);

    drm_gem_object_unreference(&obj->base);