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
42 struct 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
52 struct usnic_uiom_dev {
53 struct device *dev;
54 struct list_head link;
55 };
56
57 struct 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
65 struct 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
77 struct usnic_uiom_chunk {
78 struct list_head list;
79 int nents;
80 struct scatterlist page_list[0];
81 };
82
83 struct usnic_uiom_pd *usnic_uiom_alloc_pd(void);
84 void usnic_uiom_dealloc_pd(struct usnic_uiom_pd *pd);
85 int usnic_uiom_attach_dev_to_pd(struct usnic_uiom_pd *pd, struct device *dev);
86 void usnic_uiom_detach_dev_from_pd(struct usnic_uiom_pd *pd,
87 struct device *dev);
88 struct device **usnic_uiom_get_dev_list(struct usnic_uiom_pd *pd);
89 void usnic_uiom_free_dev_list(struct device **devs);
90 struct usnic_uiom_reg *usnic_uiom_reg_get(struct usnic_uiom_pd *pd,
91 unsigned long addr, size_t size,
92 int access, int dmasync);
93 void usnic_uiom_reg_release(struct usnic_uiom_reg *uiomr);
94 int usnic_uiom_init(char *drv_name);
95 #endif /* USNIC_UIOM_H_ */