ceph/src/seastar/dpdk/lib/librte_eal/common/eal_hugepages.h

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
   5  *   All rights reserved.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of Intel Corporation nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #ifndef EAL_HUGEPAGES_H
  35 #define EAL_HUGEPAGES_H
  36
  37 #include <stddef.h>
  38 #include <stdint.h>
  39 #include <limits.h>
  40
  41 #define MAX_HUGEPAGE_PATH PATH_MAX
  42
  43 /**
  44  * Structure used to store informations about hugepages that we mapped
  45  * through the files in hugetlbfs.
  46  */
  47 struct hugepage_file {
  48         void *orig_va;      /**< virtual addr of first mmap() */
  49         void *final_va;     /**< virtual addr of 2nd mmap() */
  50         uint64_t physaddr;  /**< physical addr */
  51         size_t size;        /**< the page size */
  52         int socket_id;      /**< NUMA socket ID */
  53         int file_id;        /**< the '%d' in HUGEFILE_FMT */
  54         int memseg_id;      /**< the memory segment to which page belongs */
  55         char filepath[MAX_HUGEPAGE_PATH]; /**< path to backing file on filesystem */
  56 };
  57
  58 /**
  59  * Read the information from linux on what hugepages are available
  60  * for the EAL to use
  61  */
  62 int eal_hugepage_info_init(void);
  63
  64 #endif /* EAL_HUGEPAGES_H */