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/slab.h>
  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
  73 int __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
  87 void __devexit c2_cleanup_pd_table(struct c2_dev *c2dev)
  88 {
  89         kfree(c2dev->pd_table.table);
  90 }