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/drivers/infiniband/hw/amso1100/c2_pd.c

https://bitbucket.org/ndreys/linux-sunxi
C | 90 lines | 48 code | 8 blank | 34 comment | 4 complexity | 8252cab4055b5f91e322fd8d0877b9b6 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
 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>
37#include <linux/slab.h>
38#include <linux/errno.h>
39
40#include "c2.h"
41#include "c2_provider.h"
42
43int 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
66void 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
73int __devinit c2_init_pd_table(struct c2_dev *c2dev)
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
87void __devexit c2_cleanup_pd_table(struct c2_dev *c2dev)
88{
89	kfree(c2dev->pd_table.table);
90}