linux/include/rdma/ib_umem.h
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   1/*
   2 * Copyright (c) 2007 Cisco Systems.  All rights reserved.
   3 *
   4 * This software is available to you under a choice of one of two
   5 * licenses.  You may choose to be licensed under the terms of the GNU
   6 * General Public License (GPL) Version 2, available from the file
   7 * COPYING in the main directory of this source tree, or the
   8 * OpenIB.org BSD license below:
   9 *
  10 *     Redistribution and use in source and binary forms, with or
  11 *     without modification, are permitted provided that the following
  12 *     conditions are met:
  13 *
  14 *      - Redistributions of source code must retain the above
  15 *        copyright notice, this list of conditions and the following
  16 *        disclaimer.
  17 *
  18 *      - Redistributions in binary form must reproduce the above
  19 *        copyright notice, this list of conditions and the following
  20 *        disclaimer in the documentation and/or other materials
  21 *        provided with the distribution.
  22 *
  23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30 * SOFTWARE.
  31 */
  32
  33#ifndef IB_UMEM_H
  34#define IB_UMEM_H
  35
  36#include <linux/list.h>
  37#include <linux/scatterlist.h>
  38#include <linux/workqueue.h>
  39
  40struct ib_ucontext;
  41
  42struct ib_umem {
  43        struct ib_ucontext     *context;
  44        size_t                  length;
  45        int                     offset;
  46        int                     page_size;
  47        int                     writable;
  48        int                     hugetlb;
  49        struct list_head        chunk_list;
  50        struct work_struct      work;
  51        struct mm_struct       *mm;
  52        unsigned long           diff;
  53};
  54
  55struct ib_umem_chunk {
  56        struct list_head        list;
  57        int                     nents;
  58        int                     nmap;
  59        struct scatterlist      page_list[0];
  60};
  61
  62#ifdef CONFIG_INFINIBAND_USER_MEM
  63
  64struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
  65                            size_t size, int access, int dmasync);
  66void ib_umem_release(struct ib_umem *umem);
  67int ib_umem_page_count(struct ib_umem *umem);
  68
  69#else /* CONFIG_INFINIBAND_USER_MEM */
  70
  71#include <linux/err.h>
  72
  73static inline struct ib_umem *ib_umem_get(struct ib_ucontext *context,
  74                                          unsigned long addr, size_t size,
  75                                          int access, int dmasync) {
  76        return ERR_PTR(-EINVAL);
  77}
  78static inline void ib_umem_release(struct ib_umem *umem) { }
  79static inline int ib_umem_page_count(struct ib_umem *umem) { return 0; }
  80
  81#endif /* CONFIG_INFINIBAND_USER_MEM */
  82
  83#endif /* IB_UMEM_H */
  84
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