release/src-rt-6.x.4708/linux/linux-2.6.36/include/rdma/ib_fmr_pool.h

   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
  39 struct 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  */
  55 struct 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
  67 struct 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
  79 struct ib_fmr_pool *ib_create_fmr_pool(struct ib_pd             *pd,
  80                                        struct ib_fmr_pool_param *params);
  81
  82 void ib_destroy_fmr_pool(struct ib_fmr_pool *pool);
  83
  84 int ib_flush_fmr_pool(struct ib_fmr_pool *pool);
  85
  86 struct 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
  91 int ib_fmr_pool_unmap(struct ib_pool_fmr *fmr);
  92
  93 #endif /* IB_FMR_POOL_H */