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/*

 * Copyright (c) 2007 Cisco Systems.  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.

 */

#ifndef IB_UMEM_H

#define IB_UMEM_H

#include <linux/list.h>

#include <linux/scatterlist.h>

#include <linux/workqueue.h>

struct ib_ucontext;

struct ib_umem {

        struct ib_ucontext     *context;

        size_t                  length;

        int                     offset;

        int                     page_size;

        int                     writable;

        int                     hugetlb;

        struct list_head        chunk_list;

        struct work_struct      work;

        struct mm_struct       *mm;

        unsigned long           diff;

};

struct ib_umem_chunk {

        struct list_head        list;

        int                     nents;

        int                     nmap;

        struct scatterlist      page_list[0];

};

#ifdef CONFIG_INFINIBAND_USER_MEM

struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,

                            size_t size, int access);

void ib_umem_release(struct ib_umem *umem);

int ib_umem_page_count(struct ib_umem *umem);

#else /* CONFIG_INFINIBAND_USER_MEM */

#include <linux/err.h>

static inline struct ib_umem *ib_umem_get(struct ib_ucontext *context,

                                          unsigned long addr, size_t size,

                                          int access) {

        return ERR_PTR(-EINVAL);

}

static inline void ib_umem_release(struct ib_umem *umem) { }

static inline int ib_umem_page_count(struct ib_umem *umem) { return 0; }

#endif /* CONFIG_INFINIBAND_USER_MEM */

#endif /* IB_UMEM_H */