include/rdma/ib_umem.h

   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 #include <rdma/ib_verbs.h>
  40
  41 struct ib_ucontext;
  42 struct ib_umem_odp;
  43
  44 struct ib_umem {
  45         struct ib_device       *ibdev;
  46         struct mm_struct       *owning_mm;
  47         size_t                  length;
  48         unsigned long           address;
  49         u32 writable : 1;
  50         u32 is_odp : 1;
  51         struct work_struct      work;
  52         struct sg_table sg_head;
  53         int             nmap;
  54         unsigned int    sg_nents;
  55 };
  56
  57 /* Returns the offset of the umem start relative to the first page. */
  58 static inline int ib_umem_offset(struct ib_umem *umem)
  59 {
  60         return umem->address & ~PAGE_MASK;
  61 }
  62
  63 static inline size_t ib_umem_num_pages(struct ib_umem *umem)
  64 {
  65         return (ALIGN(umem->address + umem->length, PAGE_SIZE) -
  66                 ALIGN_DOWN(umem->address, PAGE_SIZE)) >>
  67                PAGE_SHIFT;
  68 }
  69
  70 #ifdef CONFIG_INFINIBAND_USER_MEM
  71
  72 struct ib_umem *ib_umem_get(struct ib_udata *udata, unsigned long addr,
  73                             size_t size, int access);
  74 void ib_umem_release(struct ib_umem *umem);
  75 int ib_umem_page_count(struct ib_umem *umem);
  76 int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset,
  77                       size_t length);
  78 unsigned long ib_umem_find_best_pgsz(struct ib_umem *umem,
  79                                      unsigned long pgsz_bitmap,
  80                                      unsigned long virt);
  81
  82 #else /* CONFIG_INFINIBAND_USER_MEM */
  83
  84 #include <linux/err.h>
  85
  86 static inline struct ib_umem *ib_umem_get(struct ib_udata *udata,
  87                                           unsigned long addr, size_t size,
  88                                           int access)
  89 {
  90         return ERR_PTR(-EINVAL);
  91 }
  92 static inline void ib_umem_release(struct ib_umem *umem) { }
  93 static inline int ib_umem_page_count(struct ib_umem *umem) { return 0; }
  94 static inline int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset,
  95                                     size_t length) {
  96         return -EINVAL;
  97 }
  98 static inline int ib_umem_find_best_pgsz(struct ib_umem *umem,
  99                                          unsigned long pgsz_bitmap,
 100                                          unsigned long virt) {
 101         return -EINVAL;
 102 }
 103
 104 #endif /* CONFIG_INFINIBAND_USER_MEM */
 105
 106 #endif /* IB_UMEM_H */