[go: nahoru, domu]
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
35struct usnic_uiom_dev {
36	struct device			*dev;
37	struct list_head		link;
38};
39
40struct 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
48struct 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
61struct usnic_uiom_chunk {
62	struct list_head		list;
63	int				nents;
64	struct scatterlist		page_list[0];
65};
66
67struct usnic_uiom_pd *usnic_uiom_alloc_pd(void);
68void usnic_uiom_dealloc_pd(struct usnic_uiom_pd *pd);
69int usnic_uiom_attach_dev_to_pd(struct usnic_uiom_pd *pd, struct device *dev);
70void usnic_uiom_detach_dev_from_pd(struct usnic_uiom_pd *pd,
71					struct device *dev);
72struct device **usnic_uiom_get_dev_list(struct usnic_uiom_pd *pd);
73void usnic_uiom_free_dev_list(struct device **devs);
74struct usnic_uiom_reg *usnic_uiom_reg_get(struct usnic_uiom_pd *pd,
75						unsigned long addr, size_t size,
76						int access, int dmasync);
77void usnic_uiom_reg_release(struct usnic_uiom_reg *uiomr, int closing);
78int usnic_uiom_init(char *drv_name);
79void usnic_uiom_fini(void);
80#endif /* USNIC_UIOM_H_ */
81