drivers/infiniband/hw/amso1100/c2_pd.c

   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/errno.h>
  38
  39 #include "c2.h"
  40 #include "c2_provider.h"
  41
  42 int c2_pd_alloc(struct c2_dev *c2dev, int privileged, struct c2_pd *pd)
  43 {
  44         u32 obj;
  45         int ret = 0;
  46
  47         spin_lock(&c2dev->pd_table.lock);
  48         obj = find_next_zero_bit(c2dev->pd_table.table, c2dev->pd_table.max,
  49                                  c2dev->pd_table.last);
  50         if (obj >= c2dev->pd_table.max)
  51                 obj = find_first_zero_bit(c2dev->pd_table.table,
  52                                           c2dev->pd_table.max);
  53         if (obj < c2dev->pd_table.max) {
  54                 pd->pd_id = obj;
  55                 __set_bit(obj, c2dev->pd_table.table);
  56                 c2dev->pd_table.last = obj+1;
  57                 if (c2dev->pd_table.last >= c2dev->pd_table.max)
  58                         c2dev->pd_table.last = 0;
  59         } else
  60                 ret = -ENOMEM;
  61         spin_unlock(&c2dev->pd_table.lock);
  62         return ret;
  63 }
  64
  65 void c2_pd_free(struct c2_dev *c2dev, struct c2_pd *pd)
  66 {
  67         spin_lock(&c2dev->pd_table.lock);
  68         __clear_bit(pd->pd_id, c2dev->pd_table.table);
  69         spin_unlock(&c2dev->pd_table.lock);
  70 }
  71
  72 int __devinit c2_init_pd_table(struct c2_dev *c2dev)
  73 {
  74
  75         c2dev->pd_table.last = 0;
  76         c2dev->pd_table.max = c2dev->props.max_pd;
  77         spin_lock_init(&c2dev->pd_table.lock);
  78         c2dev->pd_table.table = kmalloc(BITS_TO_LONGS(c2dev->props.max_pd) *
  79                                         sizeof(long), GFP_KERNEL);
  80         if (!c2dev->pd_table.table)
  81                 return -ENOMEM;
  82         bitmap_zero(c2dev->pd_table.table, c2dev->props.max_pd);
  83         return 0;
  84 }
  85
  86 void __devexit c2_cleanup_pd_table(struct c2_dev *c2dev)
  87 {
  88         kfree(c2dev->pd_table.table);
  89 }