[mirror_ubuntu-bionic-kernel.git] / include / rdma / ib_umem.h

/*
 * 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_odp;

struct ib_umem {
	struct ib_ucontext     *context;
	size_t			length;
	unsigned long		address;
	int			page_shift;
	int                     writable;
	int                     hugetlb;
	struct work_struct	work;
	struct mm_struct       *mm;
	unsigned long		diff;
	struct ib_umem_odp     *odp_data;
	struct sg_table sg_head;
	int             nmap;
	int             npages;
};

/* Returns the offset of the umem start relative to the first page. */
static inline int ib_umem_offset(struct ib_umem *umem)
{
	return umem->address & (BIT(umem->page_shift) - 1);
}

/* Returns the first page of an ODP umem. */
static inline unsigned long ib_umem_start(struct ib_umem *umem)
{
	return umem->address - ib_umem_offset(umem);
}

/* Returns the address of the page after the last one of an ODP umem. */
static inline unsigned long ib_umem_end(struct ib_umem *umem)
{
	return ALIGN(umem->address + umem->length, BIT(umem->page_shift));
}

static inline size_t ib_umem_num_pages(struct ib_umem *umem)
{
	return (ib_umem_end(umem) - ib_umem_start(umem)) >> umem->page_shift;
}

#ifdef CONFIG_INFINIBAND_USER_MEM

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_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset,
		      size_t length);

#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, int dmasync) {
	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; }
static inline int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset,
		      		    size_t length) {
	return -EINVAL;
}
#endif /* CONFIG_INFINIBAND_USER_MEM */

#endif /* IB_UMEM_H */
Commit	Line	Data
f7c6a7b5 RD	1	/*
	2	* Copyright (c) 2007 Cisco Systems. All rights reserved.
	3	*
	4	* This software is available to you under a choice of one of two
	5	* licenses. You may choose to be licensed under the terms of the GNU
	6	* General Public License (GPL) Version 2, available from the file
	7	* COPYING in the main directory of this source tree, or the
	8	* OpenIB.org BSD license below:
	9	*
	10	* Redistribution and use in source and binary forms, with or
	11	* without modification, are permitted provided that the following
	12	* conditions are met:
	13	*
	14	* - Redistributions of source code must retain the above
	15	* copyright notice, this list of conditions and the following
	16	* disclaimer.
	17	*
	18	* - Redistributions in binary form must reproduce the above
	19	* copyright notice, this list of conditions and the following
	20	* disclaimer in the documentation and/or other materials
	21	* provided with the distribution.
	22	*
	23	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	24	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	25	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	26	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	27	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	28	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	29	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	30	* SOFTWARE.
	31	*/
	32
	33	#ifndef IB_UMEM_H
	34	#define IB_UMEM_H
	35
	36	#include <linux/list.h>
	37	#include <linux/scatterlist.h>
e8edc6e0	38	#include <linux/workqueue.h>
f7c6a7b5 RD	39
f7c6a7b5 RD	40	struct ib_ucontext;
8ada2c1c	41	struct ib_umem_odp;
f7c6a7b5 RD	42
	43	struct ib_umem {
	44	struct ib_ucontext *context;
	45	size_t length;
406f9e5f	46	unsigned long address;
3e7e1193	47	int page_shift;
f7c6a7b5	48	int writable;
c8d8beea	49	int hugetlb;
1bf66a30 RD	50	struct work_struct work;
	51	struct mm_struct *mm;
	52	unsigned long diff;
8ada2c1c	53	struct ib_umem_odp *odp_data;
eeb8461e YH	54	struct sg_table sg_head;
	55	int nmap;
	56	int npages;
f7c6a7b5 RD	57	};
f7c6a7b5 RD	58
406f9e5f HE	59	/* Returns the offset of the umem start relative to the first page. */
	60	static inline int ib_umem_offset(struct ib_umem *umem)
	61	{
3e7e1193	62	return umem->address & (BIT(umem->page_shift) - 1);
406f9e5f HE	63	}
	64
	65	/* Returns the first page of an ODP umem. */
	66	static inline unsigned long ib_umem_start(struct ib_umem *umem)
	67	{
	68	return umem->address - ib_umem_offset(umem);
	69	}
	70
	71	/* Returns the address of the page after the last one of an ODP umem. */
	72	static inline unsigned long ib_umem_end(struct ib_umem *umem)
	73	{
403cd12e	74	return ALIGN(umem->address + umem->length, BIT(umem->page_shift));
406f9e5f HE	75	}
	76
	77	static inline size_t ib_umem_num_pages(struct ib_umem *umem)
	78	{
403cd12e	79	return (ib_umem_end(umem) - ib_umem_start(umem)) >> umem->page_shift;
406f9e5f HE	80	}
406f9e5f HE	81
f7c6a7b5 RD	82	#ifdef CONFIG_INFINIBAND_USER_MEM
	83
	84	struct ib_umem ib_umem_get(struct ib_ucontext context, unsigned long addr,
cb9fbc5c	85	size_t size, int access, int dmasync);
f7c6a7b5 RD	86	void ib_umem_release(struct ib_umem *umem);
f7c6a7b5 RD	87	int ib_umem_page_count(struct ib_umem *umem);
c5d76f13 HE	88	int ib_umem_copy_from(void dst, struct ib_umem umem, size_t offset,
c5d76f13 HE	89	size_t length);
f7c6a7b5 RD	90
	91	#else /* CONFIG_INFINIBAND_USER_MEM */
	92
	93	#include <linux/err.h>
	94
	95	static inline struct ib_umem ib_umem_get(struct ib_ucontext context,
	96	unsigned long addr, size_t size,
cb9fbc5c	97	int access, int dmasync) {
f7c6a7b5 RD	98	return ERR_PTR(-EINVAL);
	99	}
	100	static inline void ib_umem_release(struct ib_umem *umem) { }
	101	static inline int ib_umem_page_count(struct ib_umem *umem) { return 0; }
c1395a2a HE	102	static inline int ib_umem_copy_from(void dst, struct ib_umem umem, size_t offset,
	103	size_t length) {
	104	return -EINVAL;
	105	}
f7c6a7b5 RD	106	#endif /* CONFIG_INFINIBAND_USER_MEM */
	107
	108	#endif /* IB_UMEM_H */