1 /*
2  * Copyright (c) 2013, Cisco Systems, Inc. All rights reserved.
3  *
4  * This program is free software; you may redistribute it and/or modify
5  * it under the terms of the GNU General Public License as published by
6  * the Free Software Foundation; version 2 of the License.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
9  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
10  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
11  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
12  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
13  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
14  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
15  * SOFTWARE.
16  *
17  */
18 
19 #ifndef USNIC_UIOM_H_
20 #define USNIC_UIOM_H_
21 
22 #include <linux/list.h>
23 #include <linux/scatterlist.h>
24 
25 #include "usnic_uiom_interval_tree.h"
26 
27 #define USNIC_UIOM_READ			(1)
28 #define USNIC_UIOM_WRITE		(2)
29 
30 #define USNIC_UIOM_MAX_PD_CNT		(1000)
31 #define USNIC_UIOM_MAX_MR_CNT		(1000000)
32 #define USNIC_UIOM_MAX_MR_SIZE		(~0UL)
33 #define USNIC_UIOM_PAGE_SIZE		(PAGE_SIZE)
34 
35 struct usnic_uiom_dev {
36 	struct device			*dev;
37 	struct list_head		link;
38 };
39 
40 struct usnic_uiom_pd {
41 	struct iommu_domain		*domain;
42 	spinlock_t			lock;
43 	struct rb_root			rb_root;
44 	struct list_head		devs;
45 	int				dev_cnt;
46 };
47 
48 struct usnic_uiom_reg {
49 	struct usnic_uiom_pd		*pd;
50 	unsigned long			va;
51 	size_t				length;
52 	int				offset;
53 	int				page_size;
54 	int				writable;
55 	struct list_head		chunk_list;
56 	struct work_struct		work;
57 	struct mm_struct		*mm;
58 	unsigned long			diff;
59 };
60 
61 struct usnic_uiom_chunk {
62 	struct list_head		list;
63 	int				nents;
64 	struct scatterlist		page_list[0];
65 };
66 
67 struct usnic_uiom_pd *usnic_uiom_alloc_pd(void);
68 void usnic_uiom_dealloc_pd(struct usnic_uiom_pd *pd);
69 int usnic_uiom_attach_dev_to_pd(struct usnic_uiom_pd *pd, struct device *dev);
70 void usnic_uiom_detach_dev_from_pd(struct usnic_uiom_pd *pd,
71 					struct device *dev);
72 struct device **usnic_uiom_get_dev_list(struct usnic_uiom_pd *pd);
73 void usnic_uiom_free_dev_list(struct device **devs);
74 struct usnic_uiom_reg *usnic_uiom_reg_get(struct usnic_uiom_pd *pd,
75 						unsigned long addr, size_t size,
76 						int access, int dmasync);
77 void usnic_uiom_reg_release(struct usnic_uiom_reg *uiomr, int closing);
78 int usnic_uiom_init(char *drv_name);
79 void usnic_uiom_fini(void);
80 #endif /* USNIC_UIOM_H_ */
81