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f94b533d TT |
1 | /* |
2 | * Copyright (c) 2004 Topspin Communications. All rights reserved. | |
3 | * Copyright (c) 2005 Cisco Systems. All rights reserved. | |
4 | * Copyright (c) 2005 Mellanox Technologies. All rights reserved. | |
5 | * Copyright (c) 2005 Open Grid Computing, Inc. All rights reserved. | |
6 | * | |
7 | * This software is available to you under a choice of one of two | |
8 | * licenses. You may choose to be licensed under the terms of the GNU | |
9 | * General Public License (GPL) Version 2, available from the file | |
10 | * COPYING in the main directory of this source tree, or the | |
11 | * OpenIB.org BSD license below: | |
12 | * | |
13 | * Redistribution and use in source and binary forms, with or | |
14 | * without modification, are permitted provided that the following | |
15 | * conditions are met: | |
16 | * | |
17 | * - Redistributions of source code must retain the above | |
18 | * copyright notice, this list of conditions and the following | |
19 | * disclaimer. | |
20 | * | |
21 | * - Redistributions in binary form must reproduce the above | |
22 | * copyright notice, this list of conditions and the following | |
23 | * disclaimer in the documentation and/or other materials | |
24 | * provided with the distribution. | |
25 | * | |
26 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
27 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
28 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
29 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
30 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
31 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
32 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
33 | * SOFTWARE. | |
34 | */ | |
35 | ||
36 | #include <linux/init.h> | |
5a0e3ad6 | 37 | #include <linux/slab.h> |
f94b533d TT |
38 | #include <linux/errno.h> |
39 | ||
40 | #include "c2.h" | |
41 | #include "c2_provider.h" | |
42 | ||
43 | int c2_pd_alloc(struct c2_dev *c2dev, int privileged, struct c2_pd *pd) | |
44 | { | |
45 | u32 obj; | |
46 | int ret = 0; | |
47 | ||
48 | spin_lock(&c2dev->pd_table.lock); | |
49 | obj = find_next_zero_bit(c2dev->pd_table.table, c2dev->pd_table.max, | |
50 | c2dev->pd_table.last); | |
51 | if (obj >= c2dev->pd_table.max) | |
52 | obj = find_first_zero_bit(c2dev->pd_table.table, | |
53 | c2dev->pd_table.max); | |
54 | if (obj < c2dev->pd_table.max) { | |
55 | pd->pd_id = obj; | |
56 | __set_bit(obj, c2dev->pd_table.table); | |
57 | c2dev->pd_table.last = obj+1; | |
58 | if (c2dev->pd_table.last >= c2dev->pd_table.max) | |
59 | c2dev->pd_table.last = 0; | |
60 | } else | |
61 | ret = -ENOMEM; | |
62 | spin_unlock(&c2dev->pd_table.lock); | |
63 | return ret; | |
64 | } | |
65 | ||
66 | void c2_pd_free(struct c2_dev *c2dev, struct c2_pd *pd) | |
67 | { | |
68 | spin_lock(&c2dev->pd_table.lock); | |
69 | __clear_bit(pd->pd_id, c2dev->pd_table.table); | |
70 | spin_unlock(&c2dev->pd_table.lock); | |
71 | } | |
72 | ||
1e6d9abe | 73 | int c2_init_pd_table(struct c2_dev *c2dev) |
f94b533d TT |
74 | { |
75 | ||
76 | c2dev->pd_table.last = 0; | |
77 | c2dev->pd_table.max = c2dev->props.max_pd; | |
78 | spin_lock_init(&c2dev->pd_table.lock); | |
79 | c2dev->pd_table.table = kmalloc(BITS_TO_LONGS(c2dev->props.max_pd) * | |
80 | sizeof(long), GFP_KERNEL); | |
81 | if (!c2dev->pd_table.table) | |
82 | return -ENOMEM; | |
83 | bitmap_zero(c2dev->pd_table.table, c2dev->props.max_pd); | |
84 | return 0; | |
85 | } | |
86 | ||
1e6d9abe | 87 | void c2_cleanup_pd_table(struct c2_dev *c2dev) |
f94b533d TT |
88 | { |
89 | kfree(c2dev->pd_table.table); | |
90 | } |