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>
38#include <linux/workqueue.h>
 
39
40struct ib_ucontext;
 
41
42struct ib_umem {
43	struct ib_ucontext     *context;
 
44	size_t			length;
45	int			offset;
46	int			page_size;
47	int                     writable;
48	int                     hugetlb;
49	struct list_head	chunk_list;
50	struct work_struct	work;
51	struct mm_struct       *mm;
52	unsigned long		diff;
 
53};
54
55struct ib_umem_chunk {
56	struct list_head	list;
57	int                     nents;
58	int                     nmap;
59	struct scatterlist      page_list[0];
60};
 
 
 
 
 
 
61
62#ifdef CONFIG_INFINIBAND_USER_MEM
63
64struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
65			    size_t size, int access, int dmasync);
66void ib_umem_release(struct ib_umem *umem);
67int ib_umem_page_count(struct ib_umem *umem);
 
 
 
 
 
68
69#else /* CONFIG_INFINIBAND_USER_MEM */
70
71#include <linux/err.h>
72
73static inline struct ib_umem *ib_umem_get(struct ib_ucontext *context,
74					  unsigned long addr, size_t size,
75					  int access, int dmasync) {
 
76	return ERR_PTR(-EINVAL);
77}
78static inline void ib_umem_release(struct ib_umem *umem) { }
79static inline int ib_umem_page_count(struct ib_umem *umem) { return 0; }
 
 
 
 
 
 
 
 
 
80
81#endif /* CONFIG_INFINIBAND_USER_MEM */
82
83#endif /* IB_UMEM_H */

 1/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
 2/*
 3 * Copyright (c) 2007 Cisco Systems.  All rights reserved.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 4 */
 5
 6#ifndef IB_UMEM_H
 7#define IB_UMEM_H
 8
 9#include <linux/list.h>
10#include <linux/scatterlist.h>
11#include <linux/workqueue.h>
12#include <rdma/ib_verbs.h>
13
14struct ib_ucontext;
15struct ib_umem_odp;
16
17struct ib_umem {
18	struct ib_device       *ibdev;
19	struct mm_struct       *owning_mm;
20	size_t			length;
21	unsigned long		address;
22	u32 writable : 1;
23	u32 is_odp : 1;
 
 
24	struct work_struct	work;
25	struct sg_table sg_head;
26	int             nmap;
27	unsigned int    sg_nents;
28};
29
30/* Returns the offset of the umem start relative to the first page. */
31static inline int ib_umem_offset(struct ib_umem *umem)
32{
33	return umem->address & ~PAGE_MASK;
34}
35
36static inline size_t ib_umem_num_pages(struct ib_umem *umem)
37{
38	return (ALIGN(umem->address + umem->length, PAGE_SIZE) -
39		ALIGN_DOWN(umem->address, PAGE_SIZE)) >>
40	       PAGE_SHIFT;
41}
42
43#ifdef CONFIG_INFINIBAND_USER_MEM
44
45struct ib_umem *ib_umem_get(struct ib_device *device, unsigned long addr,
46			    size_t size, int access);
47void ib_umem_release(struct ib_umem *umem);
48int ib_umem_page_count(struct ib_umem *umem);
49int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset,
50		      size_t length);
51unsigned long ib_umem_find_best_pgsz(struct ib_umem *umem,
52				     unsigned long pgsz_bitmap,
53				     unsigned long virt);
54
55#else /* CONFIG_INFINIBAND_USER_MEM */
56
57#include <linux/err.h>
58
59static inline struct ib_umem *ib_umem_get(struct ib_device *device,
60					  unsigned long addr, size_t size,
61					  int access)
62{
63	return ERR_PTR(-EINVAL);
64}
65static inline void ib_umem_release(struct ib_umem *umem) { }
66static inline int ib_umem_page_count(struct ib_umem *umem) { return 0; }
67static inline int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset,
68		      		    size_t length) {
69	return -EINVAL;
70}
71static inline int ib_umem_find_best_pgsz(struct ib_umem *umem,
72					 unsigned long pgsz_bitmap,
73					 unsigned long virt) {
74	return -EINVAL;
75}
76
77#endif /* CONFIG_INFINIBAND_USER_MEM */
78
79#endif /* IB_UMEM_H */