path: root/drivers/infiniband/core/uverbs_cmd.c

/*
 * Copyright (c) 2005 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 Cisco Systems.  All rights reserved.
 * Copyright (c) 2005 PathScale, Inc.  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: uverbs_cmd.c 2708 2005-06-24 17:27:21Z roland $
 */

#include <linux/file.h>

#include <asm/uaccess.h>

#include "uverbs.h"

#define INIT_UDATA(udata, ibuf, obuf, ilen, olen)			\
	do {								\
		(udata)->inbuf  = (void __user *) (ibuf);		\
		(udata)->outbuf = (void __user *) (obuf);		\
		(udata)->inlen  = (ilen);				\
		(udata)->outlen = (olen);				\
	} while (0)

ssize_t ib_uverbs_get_context(struct ib_uverbs_file *file,
			      const char __user *buf,
			      int in_len, int out_len)
{
	struct ib_uverbs_get_context      cmd;
	struct ib_uverbs_get_context_resp resp;
	struct ib_udata                   udata;
	struct ib_device                 *ibdev = file->device->ib_dev;
	struct ib_ucontext		 *ucontext;
	struct file			 *filp;
	int ret;

	if (out_len < sizeof resp)
		return -ENOSPC;

	if (copy_from_user(&cmd, buf, sizeof cmd))
		return -EFAULT;

	down(&file->mutex);

	if (file->ucontext) {
		ret = -EINVAL;
		goto err;
	}

	INIT_UDATA(&udata, buf + sizeof cmd,
		   (unsigned long) cmd.response + sizeof resp,
		   in_len - sizeof cmd, out_len - sizeof resp);

	ucontext = ibdev->alloc_ucontext(ibdev, &udata);
	if (IS_ERR(ucontext))
		return PTR_ERR(file->ucontext);

	ucontext->device = ibdev;
	INIT_LIST_HEAD(&ucontext->pd_list);
	INIT_LIST_HEAD(&ucontext->mr_list);
	INIT_LIST_HEAD(&ucontext->mw_list);
	INIT_LIST_HEAD(&ucontext->cq_list);
	INIT_LIST_HEAD(&ucontext->qp_list);
	INIT_LIST_HEAD(&ucontext->srq_list);
	INIT_LIST_HEAD(&ucontext->ah_list);

	resp.num_comp_vectors = file->device->num_comp_vectors;

	filp = ib_uverbs_alloc_event_file(file, 1, &resp.async_fd);
	if (IS_ERR(filp)) {
		ret = PTR_ERR(filp);
		goto err_free;
	}

	if (copy_to_user((void __user *) (unsigned long) cmd.response,
			 &resp, sizeof resp)) {
		ret = -EFAULT;
		goto err_file;
	}

	file