ib_umem.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0
    3  *
    4  * Copyright (c) 2007 Cisco Systems.  All rights reserved.
    5  *
    6  * This software is available to you under a choice of one of two
    7  * licenses.  You may choose to be licensed under the terms of the GNU
    8  * General Public License (GPL) Version 2, available from the file
    9  * COPYING in the main directory of this source tree, or the
   10  * OpenIB.org BSD license below:
   11  *
   12  *     Redistribution and use in source and binary forms, with or
   13  *     without modification, are permitted provided that the following
   14  *     conditions are met:
   15  *
   16  *      - Redistributions of source code must retain the above
   17  *        copyright notice, this list of conditions and the following
   18  *        disclaimer.
   19  *
   20  *      - Redistributions in binary form must reproduce the above
   21  *        copyright notice, this list of conditions and the following
   22  *        disclaimer in the documentation and/or other materials
   23  *        provided with the distribution.
   24  *
   25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
   27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
   28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
   29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
   30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
   31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   32  * SOFTWARE.
   33  *
   34  * $FreeBSD$
   35  */
   36 
   37 #ifndef IB_UMEM_H
   38 #define IB_UMEM_H
   39 
   40 #include <linux/list.h>
   41 #include <linux/scatterlist.h>
   42 #include <linux/workqueue.h>
   43 
   44 struct ib_ucontext;
   45 struct ib_umem_odp;
   46 
   47 struct ib_umem {
   48         struct ib_ucontext     *context;
   49         size_t                  length;
   50         unsigned long           address;
   51         int                     page_size;
   52         int                     writable;
   53         struct work_struct      work;
   54         pid_t                   pid;
   55         struct mm_struct       *mm;
   56         unsigned long           diff;
   57         struct ib_umem_odp     *odp_data;
   58         struct sg_table sg_head;
   59         int             nmap;
   60         int             npages;
   61 };
   62 
   63 /* Returns the offset of the umem start relative to the first page. */
   64 static inline int ib_umem_offset(struct ib_umem *umem)
   65 {
   66         return umem->address & ((unsigned long)umem->page_size - 1);
   67 }
   68 
   69 /* Returns the first page of an ODP umem. */
   70 static inline unsigned long ib_umem_start(struct ib_umem *umem)
   71 {
   72         return umem->address - ib_umem_offset(umem);
   73 }
   74 
   75 /* Returns the address of the page after the last one of an ODP umem. */
   76 static inline unsigned long ib_umem_end(struct ib_umem *umem)
   77 {
   78         return PAGE_ALIGN(umem->address + umem->length);
   79 }
   80 
   81 static inline size_t ib_umem_num_pages(struct ib_umem *umem)
   82 {
   83         return (ib_umem_end(umem) - ib_umem_start(umem)) >> PAGE_SHIFT;
   84 }
   85 
   86 #ifdef CONFIG_INFINIBAND_USER_MEM
   87 
   88 struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
   89                             size_t size, int access, int dmasync);
   90 void ib_umem_release(struct ib_umem *umem);
   91 int ib_umem_page_count(struct ib_umem *umem);
   92 int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset,
   93                       size_t length);
   94 
   95 #else /* CONFIG_INFINIBAND_USER_MEM */
   96 
   97 #include <linux/err.h>
   98 
   99 static inline struct ib_umem *ib_umem_get(struct ib_ucontext *context,
  100                                           unsigned long addr, size_t size,
  101                                           int access, int dmasync) {
  102         return ERR_PTR(-EINVAL);
  103 }
  104 static inline void ib_umem_release(struct ib_umem *umem) { }
  105 static inline int ib_umem_page_count(struct ib_umem *umem) { return 0; }
  106 static inline int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset,
  107                                     size_t length) {
  108         return -EINVAL;
  109 }
  110 #endif /* CONFIG_INFINIBAND_USER_MEM */
  111 
  112 #endif /* IB_UMEM_H */

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FreeBSD/Linux Kernel Cross Reference sys/ofed/include/rdma/ib_umem.h

FreeBSD/Linux Kernel Cross Reference
sys/ofed/include/rdma/ib_umem.h