Commit | Line | Data |
---|---|---|
e126ba97 | 1 | /* |
6cf0a15f | 2 | * Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved. |
e126ba97 EC |
3 | * |
4 | * This software is available to you under a choice of one of two | |
5 | * licenses. You may choose to be licensed under the terms of the GNU | |
6 | * General Public License (GPL) Version 2, available from the file | |
7 | * COPYING in the main directory of this source tree, or the | |
8 | * OpenIB.org BSD license below: | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or | |
11 | * without modification, are permitted provided that the following | |
12 | * conditions are met: | |
13 | * | |
14 | * - Redistributions of source code must retain the above | |
15 | * copyright notice, this list of conditions and the following | |
16 | * disclaimer. | |
17 | * | |
18 | * - Redistributions in binary form must reproduce the above | |
19 | * copyright notice, this list of conditions and the following | |
20 | * disclaimer in the documentation and/or other materials | |
21 | * provided with the distribution. | |
22 | * | |
23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
25 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
27 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
28 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
29 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
30 | * SOFTWARE. | |
31 | */ | |
32 | ||
33 | #include <linux/kref.h> | |
34 | #include <linux/slab.h> | |
35 | #include <rdma/ib_umem.h> | |
36 | ||
37 | #include "mlx5_ib.h" | |
38 | ||
39 | struct mlx5_ib_user_db_page { | |
40 | struct list_head list; | |
41 | struct ib_umem *umem; | |
42 | unsigned long user_virt; | |
43 | int refcnt; | |
44 | }; | |
45 | ||
46 | int mlx5_ib_db_map_user(struct mlx5_ib_ucontext *context, unsigned long virt, | |
47 | struct mlx5_db *db) | |
48 | { | |
49 | struct mlx5_ib_user_db_page *page; | |
e126ba97 EC |
50 | int err = 0; |
51 | ||
52 | mutex_lock(&context->db_page_mutex); | |
53 | ||
54 | list_for_each_entry(page, &context->db_page_list, list) | |
55 | if (page->user_virt == (virt & PAGE_MASK)) | |
56 | goto found; | |
57 | ||
58 | page = kmalloc(sizeof(*page), GFP_KERNEL); | |
59 | if (!page) { | |
60 | err = -ENOMEM; | |
61 | goto out; | |
62 | } | |
63 | ||
64 | page->user_virt = (virt & PAGE_MASK); | |
65 | page->refcnt = 0; | |
66 | page->umem = ib_umem_get(&context->ibucontext, virt & PAGE_MASK, | |
67 | PAGE_SIZE, 0, 0); | |
68 | if (IS_ERR(page->umem)) { | |
69 | err = PTR_ERR(page->umem); | |
70 | kfree(page); | |
71 | goto out; | |
72 | } | |
73 | ||
74 | list_add(&page->list, &context->db_page_list); | |
75 | ||
76 | found: | |
eeb8461e | 77 | db->dma = sg_dma_address(page->umem->sg_head.sgl) + (virt & ~PAGE_MASK); |
e126ba97 EC |
78 | db->u.user_page = page; |
79 | ++page->refcnt; | |
80 | ||
81 | out: | |
82 | mutex_unlock(&context->db_page_mutex); | |
83 | ||
84 | return err; | |
85 | } | |
86 | ||
87 | void mlx5_ib_db_unmap_user(struct mlx5_ib_ucontext *context, struct mlx5_db *db) | |
88 | { | |
89 | mutex_lock(&context->db_page_mutex); | |
90 | ||
91 | if (!--db->u.user_page->refcnt) { | |
92 | list_del(&db->u.user_page->list); | |
93 | ib_umem_release(db->u.user_page->umem); | |
94 | kfree(db->u.user_page); | |
95 | } | |
96 | ||
97 | mutex_unlock(&context->db_page_mutex); | |
98 | } |