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 #define USNIC_UIOM_READ			(1)
43 #define USNIC_UIOM_WRITE		(2)
44 
45 #define USNIC_UIOM_MAX_PD_CNT		(1000)
46 #define USNIC_UIOM_MAX_MR_CNT		(1000000)
47 #define USNIC_UIOM_MAX_MR_SIZE		(~0UL)
48 #define USNIC_UIOM_PAGE_SIZE		(PAGE_SIZE)
49 
50 struct usnic_uiom_dev {
51 	struct device			*dev;
52 	struct list_head		link;
53 };
54 
55 struct usnic_uiom_pd {
56 	struct iommu_domain		*domain;
57 	spinlock_t			lock;
58 	struct rb_root_cached		root;
59 	struct list_head		devs;
60 	int				dev_cnt;
61 };
62 
63 struct usnic_uiom_reg {
64 	struct usnic_uiom_pd		*pd;
65 	unsigned long			va;
66 	size_t				length;
67 	int				offset;
68 	int				page_size;
69 	int				writable;
70 	struct list_head		chunk_list;
71 	struct work_struct		work;
72 	struct mm_struct		*mm;
73 	unsigned long			diff;
74 };
75 
76 struct usnic_uiom_chunk {
77 	struct list_head		list;
78 	int				nents;
79 	struct scatterlist		page_list[0];
80 };
81 
82 struct usnic_uiom_pd *usnic_uiom_alloc_pd(void);
83 void usnic_uiom_dealloc_pd(struct usnic_uiom_pd *pd);
84 int usnic_uiom_attach_dev_to_pd(struct usnic_uiom_pd *pd, struct device *dev);
85 void usnic_uiom_detach_dev_from_pd(struct usnic_uiom_pd *pd,
86 					struct device *dev);
87 struct device **usnic_uiom_get_dev_list(struct usnic_uiom_pd *pd);
88 void usnic_uiom_free_dev_list(struct device **devs);
89 struct usnic_uiom_reg *usnic_uiom_reg_get(struct usnic_uiom_pd *pd,
90 						unsigned long addr, size_t size,
91 						int access, int dmasync);
92 void usnic_uiom_reg_release(struct usnic_uiom_reg *uiomr, int closing);
93 int usnic_uiom_init(char *drv_name);
94 void usnic_uiom_fini(void);
95 #endif /* USNIC_UIOM_H_ */
96