1/*
 2 * Copyright (c) 2013, Cisco Systems, Inc. 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 * 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
34#ifndef USNIC_UIOM_H_
35#define USNIC_UIOM_H_
36
37#include <linux/list.h>
38#include <linux/scatterlist.h>
39
40#include "usnic_uiom_interval_tree.h"
41
42struct ib_ucontext;
43
44#define USNIC_UIOM_READ			(1)
45#define USNIC_UIOM_WRITE		(2)
46
47#define USNIC_UIOM_MAX_PD_CNT		(1000)
48#define USNIC_UIOM_MAX_MR_CNT		(1000000)
49#define USNIC_UIOM_MAX_MR_SIZE		(~0UL)
50#define USNIC_UIOM_PAGE_SIZE		(PAGE_SIZE)
51
52struct usnic_uiom_dev {
53	struct device			*dev;
54	struct list_head		link;
55};
56
57struct usnic_uiom_pd {
58	struct iommu_domain		*domain;
59	spinlock_t			lock;
60	struct rb_root_cached		root;
61	struct list_head		devs;
62	int				dev_cnt;
63};
64
65struct usnic_uiom_reg {
66	struct usnic_uiom_pd		*pd;
67	unsigned long			va;
68	size_t				length;
69	int				offset;
70	int				page_size;
71	int				writable;
72	struct list_head		chunk_list;
73	struct work_struct		work;
74	struct mm_struct		*owning_mm;
75};
76
77struct usnic_uiom_chunk {
78	struct list_head		list;
79	int				nents;
80	struct scatterlist		page_list[] __counted_by(nents);
81};
82
83struct usnic_uiom_pd *usnic_uiom_alloc_pd(struct device *dev);
84void usnic_uiom_dealloc_pd(struct usnic_uiom_pd *pd);
85int usnic_uiom_attach_dev_to_pd(struct usnic_uiom_pd *pd, struct device *dev);
86void usnic_uiom_detach_dev_from_pd(struct usnic_uiom_pd *pd,
87					struct device *dev);
88struct device **usnic_uiom_get_dev_list(struct usnic_uiom_pd *pd);
89void usnic_uiom_free_dev_list(struct device **devs);
90struct usnic_uiom_reg *usnic_uiom_reg_get(struct usnic_uiom_pd *pd,
91						unsigned long addr, size_t size,
92						int access, int dmasync);
93void usnic_uiom_reg_release(struct usnic_uiom_reg *uiomr);
94#endif /* USNIC_UIOM_H_ */