text: /*
   * Copyright (c) 2007 Cisco Systems.  All rights reserved.
   *
   * This software is available to you under a choice of one of two
   * licenses.  You may choose to be licensed under the terms of the GNU
   * General Public License (GPL) Version 2, available from the file
   * COPYING in the main directory of this source tree, or the
   * OpenIB.org BSD license below:
   *
   *     Redistribution and use in source and binary forms, with or
   *     without modification, are permitted provided that the following
   *     conditions are met:
   *
   *      - Redistributions of source code must retain the above
   *        copyright notice, this list of conditions and the following
   *        disclaimer.
   *
   *      - Redistributions in binary form must reproduce the above
   *        copyright notice, this list of conditions and the following
   *        disclaimer in the documentation and/or other materials
   *        provided with the distribution.
   *
   * 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
   * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
   * 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.
   */
  
  #ifndef IB_UMEM_H
  #define IB_UMEM_H
  
  #include <linux/list.h>
  #include <linux/scatterlist.h>
  #include <linux/workqueue.h>
  #include <linux/dma-attrs.h>
  
  struct ib_ucontext;
  struct vm_area_struct;
  
  struct ib_umem {
  	struct ib_ucontext     *context;
  	size_t			length;
  	int			offset;
  	int			page_size;
  	int                     writable;
  	int                     hugetlb;
  	struct list_head	chunk_list;
  #ifdef __linux__
  	struct work_struct	work;
  	struct mm_struct       *mm;
  #else
  	unsigned long		start;
  #endif
  	unsigned long		diff;
  };
  
  struct ib_cmem {
  
          struct ib_ucontext     *context;
          size_t                  length;
          /* Link list of contiguous blocks being part of that cmem  */
          struct list_head ib_cmem_block;
  
          /* Order of cmem block,  2^ block_order will equal number
               of physical pages per block
          */
          unsigned long    block_order;
          /* Refernce counter for that memory area
            - When value became 0 pages will be returned to the kernel.
          */
          struct kref refcount;
  };
  
  
  struct ib_umem_chunk {
  	struct list_head	list;
  	int                     nents;
  	int                     nmap;
  	struct dma_attrs	attrs;
  	struct scatterlist      page_list[0];
  };
  
  struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
  			    size_t size, int access, int dmasync);
  void ib_umem_release(struct ib_umem *umem);
  int ib_umem_page_count(struct ib_umem *umem);
  
  int ib_cmem_map_contiguous_pages_to_vma(struct ib_cmem *ib_cmem,
          struct vm_area_struct *vma);
  struct ib_cmem *ib_cmem_alloc_contiguous_pages(struct ib_ucontext *context,
                                  unsigned long total_size,
                                  unsigned long page_size_order);
  void ib_cmem_release_contiguous_pages(struct ib_cmem *cmem);
  int ib_umem_map_to_vma(struct ib_umem *umem,
                                  struct vm_area_struct *vma);
  
  
  #endif /* IB_UMEM_H */
  