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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>
#include <linux/dma-attrs.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;
#ifdef __linux__
struct work_struct work;
struct mm_struct *mm;
#else
unsigned long start;
#endif
unsigned long diff;
};
struct ib_cmem {
struct ib_ucontext *context;
size_t length;
/* Link list of contiguous blocks being part of that cmem */
struct list_head ib_cmem_block;
/* Order of cmem block, 2^ block_order will equal number
of physical pages per block
*/
unsigned long block_order;
/* Refernce counter for that memory area
- When value became 0 pages will be returned to the kernel.
*/
struct kref refcount;
};
struct ib_umem_chunk {
struct list_head list;
int nents;
int nmap;
struct dma_attrs attrs;
struct scatterlist page_list[0];
};
struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
size_t size, int access, int dmasync);
void ib_umem_release(struct ib_umem *umem);
int ib_umem_page_count(struct ib_umem *umem);
int ib_cmem_map_contiguous_pages_to_vma(struct ib_cmem *ib_cmem,
struct vm_area_struct *vma);
struct ib_cmem *ib_cmem_alloc_contiguous_pages(struct ib_ucontext *context,
unsigned long total_size,
unsigned long page_size_order);
void ib_cmem_release_contiguous_pages(struct ib_cmem *cmem);
int ib_umem_map_to_vma(struct ib_umem *umem,
struct vm_area_struct *vma);
#endif /* IB_UMEM_H */
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