linux/include/rdma/ib_fmr_pool.h
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   1/*
   2 * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
   3 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   4 *
   5 * This software is available to you under a choice of one of two
   6 * licenses.  You may choose to be licensed under the terms of the GNU
   7 * General Public License (GPL) Version 2, available from the file
   8 * COPYING in the main directory of this source tree, or the
   9 * OpenIB.org BSD license below:
  10 *
  11 *     Redistribution and use in source and binary forms, with or
  12 *     without modification, are permitted provided that the following
  13 *     conditions are met:
  14 *
  15 *      - Redistributions of source code must retain the above
  16 *        copyright notice, this list of conditions and the following
  17 *        disclaimer.
  18 *
  19 *      - Redistributions in binary form must reproduce the above
  20 *        copyright notice, this list of conditions and the following
  21 *        disclaimer in the documentation and/or other materials
  22 *        provided with the distribution.
  23 *
  24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31 * SOFTWARE.
  32 */
  33
  34#if !defined(IB_FMR_POOL_H)
  35#define IB_FMR_POOL_H
  36
  37#include <rdma/ib_verbs.h>
  38
  39struct ib_fmr_pool;
  40
  41/**
  42 * struct ib_fmr_pool_param - Parameters for creating FMR pool
  43 * @max_pages_per_fmr:Maximum number of pages per map request.
  44 * @page_shift: Log2 of sizeof "pages" mapped by this fmr
  45 * @access:Access flags for FMRs in pool.
  46 * @pool_size:Number of FMRs to allocate for pool.
  47 * @dirty_watermark:Flush is triggered when @dirty_watermark dirty
  48 *     FMRs are present.
  49 * @flush_function:Callback called when unmapped FMRs are flushed and
  50 *     more FMRs are possibly available for mapping
  51 * @flush_arg:Context passed to user's flush function.
  52 * @cache:If set, FMRs may be reused after unmapping for identical map
  53 *     requests.
  54 */
  55struct ib_fmr_pool_param {
  56        int                     max_pages_per_fmr;
  57        int                     page_shift;
  58        enum ib_access_flags    access;
  59        int                     pool_size;
  60        int                     dirty_watermark;
  61        void                  (*flush_function)(struct ib_fmr_pool *pool,
  62                                                void               *arg);
  63        void                   *flush_arg;
  64        unsigned                cache:1;
  65};
  66
  67struct ib_pool_fmr {
  68        struct ib_fmr      *fmr;
  69        struct ib_fmr_pool *pool;
  70        struct list_head    list;
  71        struct hlist_node   cache_node;
  72        int                 ref_count;
  73        int                 remap_count;
  74        u64                 io_virtual_address;
  75        int                 page_list_len;
  76        u64                 page_list[0];
  77};
  78
  79struct ib_fmr_pool *ib_create_fmr_pool(struct ib_pd             *pd,
  80                                       struct ib_fmr_pool_param *params);
  81
  82void ib_destroy_fmr_pool(struct ib_fmr_pool *pool);
  83
  84int ib_flush_fmr_pool(struct ib_fmr_pool *pool);
  85
  86struct ib_pool_fmr *ib_fmr_pool_map_phys(struct ib_fmr_pool *pool_handle,
  87                                         u64                *page_list,
  88                                         int                 list_len,
  89                                         u64                 io_virtual_address);
  90
  91int ib_fmr_pool_unmap(struct ib_pool_fmr *fmr);
  92
  93#endif /* IB_FMR_POOL_H */
  94
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