text: /*
   * Copyright (C) 2007-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA,
   * All Rights Reserved.
   * Copyright (C) 2009 VMware, Inc., Palo Alto, CA., USA,
   * All Rights Reserved.
   *
   * Permission is hereby granted, free of charge, to any person obtaining a
   * copy of this software and associated documentation files (the "Software"),
   * to deal in the Software without restriction, including without limitation
   * the rights to use, copy, modify, merge, publish, distribute, sub license,
   * and/or sell copies of the Software, and to permit persons to whom the
   * Software is furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice (including the
   * next paragraph) shall be included in all copies or substantial portions
   * of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
   * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
   * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
   * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
   * USE OR OTHER DEALINGS IN THE SOFTWARE.
   */
  
  #include "drmP.h"
  
  #include "nouveau_drv.h"
  
  int
  nouveau_ttm_mmap(struct file *filp, struct vm_area_struct *vma)
  {
  	struct drm_file *file_priv = filp->private_data;
  	struct drm_nouveau_private *dev_priv =
  		file_priv->minor->dev->dev_private;
  
  	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
  		return drm_mmap(filp, vma);
  
  	return ttm_bo_mmap(filp, vma, &dev_priv->ttm.bdev);
  }
  
  static int
  nouveau_ttm_mem_global_init(struct drm_global_reference *ref)
  {
  	return ttm_mem_global_init(ref->object);
  }
  
  static void
  nouveau_ttm_mem_global_release(struct drm_global_reference *ref)
  {
  	ttm_mem_global_release(ref->object);
  }
  
  int
  nouveau_ttm_global_init(struct drm_nouveau_private *dev_priv)
  {
  	struct drm_global_reference *global_ref;
  	int ret;
  
  	global_ref = &dev_priv->ttm.mem_global_ref;
  	global_ref->global_type = DRM_GLOBAL_TTM_MEM;
  	global_ref->size = sizeof(struct ttm_mem_global);
  	global_ref->init = &nouveau_ttm_mem_global_init;
  	global_ref->release = &nouveau_ttm_mem_global_release;
  
  	ret = drm_global_item_ref(global_ref);
  	if (unlikely(ret != 0)) {
  		DRM_ERROR("Failed setting up TTM memory accounting\n");
  		dev_priv->ttm.mem_global_ref.release = NULL;
  		return ret;
  	}
  
  	dev_priv->ttm.bo_global_ref.mem_glob = global_ref->object;
  	global_ref = &dev_priv->ttm.bo_global_ref.ref;
  	global_ref->global_type = DRM_GLOBAL_TTM_BO;
  	global_ref->size = sizeof(struct ttm_bo_global);
  	global_ref->init = &ttm_bo_global_init;
  	global_ref->release = &ttm_bo_global_release;
  
  	ret = drm_global_item_ref(global_ref);
  	if (unlikely(ret != 0)) {
  		DRM_ERROR("Failed setting up TTM BO subsystem\n");
  		drm_global_item_unref(&dev_priv->ttm.mem_global_ref);
  		dev_priv->ttm.mem_global_ref.release = NULL;
  		return ret;
  	}
  
  	return 0;
  }
  
  void
  nouveau_ttm_global_release(struct drm_nouveau_private *dev_priv)
  {
  	if (dev_priv->ttm.mem_global_ref.release == NULL)
  		return;
  
  	drm_global_item_unref(&dev_priv->ttm.bo_global_ref.ref);
  	drm_global_item_unref(&dev_priv->ttm.mem_global_ref);
  	dev_priv->ttm.mem_global_ref.release = NULL;
  }
  
  