LXR linux/include/rdma/ib

   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;
  41struct ib_umem_odp;
  42
  43struct ib_umem {
  44        struct ib_ucontext     *context;
  45        size_t                  length;
  46        unsigned long           address;
  47        int                     page_shift;
  48        int                     writable;
  49        int                     hugetlb;
  50        struct work_struct      work;
  51        struct mm_struct       *mm;
  52        unsigned long           diff;
  53        struct ib_umem_odp     *odp_data;
  54        struct sg_table sg_head;
  55        int             nmap;
  56        int             npages;
  57};
  58
  59/* Returns the offset of the umem start relative to the first page. */
  60static inline int ib_umem_offset(struct ib_umem *umem)
  61{
  62        return umem->address & (BIT(umem->page_shift) - 1);
  63}
  64
  65/* Returns the first page of an ODP umem. */
  66static inline unsigned long ib_umem_start(struct ib_umem *umem)
  67{
  68        return umem->address - ib_umem_offset(umem);
  69}
  70
  71/* Returns the address of the page after the last one of an ODP umem. */
  72static inline unsigned long ib_umem_end(struct ib_umem *umem)
  73{
  74        return ALIGN(umem->address + umem->length, BIT(umem->page_shift));
  75}
  76
  77static inline size_t ib_umem_num_pages(struct ib_umem *umem)
  78{
  79        return (ib_umem_end(umem) - ib_umem_start(umem)) >> umem->page_shift;
  80}
  81
  82#ifdef CONFIG_INFINIBAND_USER_MEM
  83
  84struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
  85                            size_t size, int access, int dmasync);
  86void ib_umem_release(struct ib_umem *umem);
  87int ib_umem_page_count(struct ib_umem *umem);
  88int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset,
  89                      size_t length);
  90
  91#else /* CONFIG_INFINIBAND_USER_MEM */
  92
  93#include <linux/err.h>
  94
  95static inline struct ib_umem *ib_umem_get(struct ib_ucontext *context,
  96                                          unsigned long addr, size_t size,
  97                                          int access, int dmasync) {
  98        return ERR_PTR(-EINVAL);
  99}
 100static inline void ib_umem_release(struct ib_umem *umem) { }
 101static inline int ib_umem_page_count(struct ib_umem *umem) { return 0; }
 102static inline int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset,
 103                                    size_t length) {
 104        return -EINVAL;
 105}
 106#endif /* CONFIG_INFINIBAND_USER_MEM */
 107
 108#endif /* IB_UMEM_H */
 109