LXR linux/drivers/infiniband/hw/amso1100/c2

   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 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 c2_cleanup_pd_table(struct c2_dev *c2dev)
  88{
  89        kfree(c2dev->pd_table.table);
  90}
  91