fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / include / rdma / ib_fmr_pool.h
blob00dadbf94e1d75cca1d9004a9b997efe3eb103c6
1 /*
2 * Copyright (c) 2004 Topspin Corporation. All rights reserved.
3 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
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:
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
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.
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.
33 * $Id: ib_fmr_pool.h 2730 2005-06-28 16:43:03Z sean.hefty $
36 #if !defined(IB_FMR_POOL_H)
37 #define IB_FMR_POOL_H
39 #include <rdma/ib_verbs.h>
41 struct ib_fmr_pool;
43 /**
44 * struct ib_fmr_pool_param - Parameters for creating FMR pool
45 * @max_pages_per_fmr:Maximum number of pages per map request.
46 * @page_shift: Log2 of sizeof "pages" mapped by this fmr
47 * @access:Access flags for FMRs in pool.
48 * @pool_size:Number of FMRs to allocate for pool.
49 * @dirty_watermark:Flush is triggered when @dirty_watermark dirty
50 * FMRs are present.
51 * @flush_function:Callback called when unmapped FMRs are flushed and
52 * more FMRs are possibly available for mapping
53 * @flush_arg:Context passed to user's flush function.
54 * @cache:If set, FMRs may be reused after unmapping for identical map
55 * requests.
57 struct ib_fmr_pool_param {
58 int max_pages_per_fmr;
59 int page_shift;
60 enum ib_access_flags access;
61 int pool_size;
62 int dirty_watermark;
63 void (*flush_function)(struct ib_fmr_pool *pool,
64 void * arg);
65 void *flush_arg;
66 unsigned cache:1;
69 struct ib_pool_fmr {
70 struct ib_fmr *fmr;
71 struct ib_fmr_pool *pool;
72 struct list_head list;
73 struct hlist_node cache_node;
74 int ref_count;
75 int remap_count;
76 u64 io_virtual_address;
77 int page_list_len;
78 u64 page_list[0];
81 struct ib_fmr_pool *ib_create_fmr_pool(struct ib_pd *pd,
82 struct ib_fmr_pool_param *params);
84 void ib_destroy_fmr_pool(struct ib_fmr_pool *pool);
86 int ib_flush_fmr_pool(struct ib_fmr_pool *pool);
88 struct ib_pool_fmr *ib_fmr_pool_map_phys(struct ib_fmr_pool *pool_handle,
89 u64 *page_list,
90 int list_len,
91 u64 io_virtual_address);
93 int ib_fmr_pool_unmap(struct ib_pool_fmr *fmr);
95 #endif /* IB_FMR_POOL_H */