/*
* Copyright (c) 2005 Topspin Communications. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* $Id: ucm.c 2594 2005-06-13 19:46:02Z libor $
*/
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/poll.h>
#include <linux/file.h>
#include <linux/mount.h>
#include <linux/cdev.h>
#include <asm/uaccess.h>
#include "ucm.h"
MODULE_AUTHOR("Libor Michalek");
MODULE_DESCRIPTION("InfiniBand userspace Connection Manager access");
MODULE_LICENSE("Dual BSD/GPL");
enum {
IB_UCM_MAJOR = 231,
IB_UCM_MINOR = 255
};
#define IB_UCM_DEV MKDEV(IB_UCM_MAJOR, IB_UCM_MINOR)
static struct semaphore ctx_id_mutex;
static struct idr ctx_id_table;
static int ctx_id_rover = 0;
static struct ib_ucm_context *ib_ucm_ctx_get(int id)
{
struct ib_ucm_context *ctx;
down(&ctx_id_mutex);
ctx = idr_find(&ctx_id_table, id);
if (ctx)
ctx->ref++;
up(&ctx_id_mutex);
return ctx;
}
static void ib_ucm_ctx_put(struct ib_ucm_context *ctx)
{
struct ib_ucm_event *uevent;
down(&ctx_id_mutex);
ctx->ref--;
if (!ctx->ref)
idr_remove(&ctx_id_table, ctx->id);
up(&ctx_id_mutex);
</