1 /*
2  * AGPGART backend specific includes. Not for userspace consumption.
3  *
4  * Copyright (C) 2004 Silicon Graphics, Inc.
5  * Copyright (C) 2002-2003 Dave Jones
6  * Copyright (C) 1999 Jeff Hartmann
7  * Copyright (C) 1999 Precision Insight, Inc.
8  * Copyright (C) 1999 Xi Graphics, Inc.
9  *
10  * Permission is hereby granted, free of charge, to any person obtaining a
11  * copy of this software and associated documentation files (the "Software"),
12  * to deal in the Software without restriction, including without limitation
13  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
14  * and/or sell copies of the Software, and to permit persons to whom the
15  * Software is furnished to do so, subject to the following conditions:
16  *
17  * The above copyright notice and this permission notice shall be included
18  * in all copies or substantial portions of the Software.
19  *
20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
21  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
23  * JEFF HARTMANN, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM,
24  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
25  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
26  * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
27  *
28  */
29 
30 #ifndef _AGP_BACKEND_H
31 #define _AGP_BACKEND_H 1
32 
33 #include <linux/list.h>
34 
35 enum chipset_type {
36 	NOT_SUPPORTED,
37 	SUPPORTED,
38 };
39 
40 struct agp_version {
41 	u16 major;
42 	u16 minor;
43 };
44 
45 struct agp_kern_info {
46 	struct agp_version version;
47 	struct pci_dev *device;
48 	enum chipset_type chipset;
49 	unsigned long mode;
50 	unsigned long aper_base;
51 	size_t aper_size;
52 	int max_memory;		/* In pages */
53 	int current_memory;
54 	bool cant_use_aperture;
55 	unsigned long page_mask;
56 	const struct vm_operations_struct *vm_ops;
57 };
58 
59 /*
60  * The agp_memory structure has information about the block of agp memory
61  * allocated.  A caller may manipulate the next and prev pointers to link
62  * each allocated item into a list.  These pointers are ignored by the backend.
63  * Everything else should never be written to, but the caller may read any of
64  * the items to determine the status of this block of agp memory.
65  */
66 
67 struct agp_bridge_data;
68 
69 struct agp_memory {
70 	struct agp_memory *next;
71 	struct agp_memory *prev;
72 	struct agp_bridge_data *bridge;
73 	struct page **pages;
74 	size_t page_count;
75 	int key;
76 	int num_scratch_pages;
77 	off_t pg_start;
78 	u32 type;
79 	u32 physical;
80 	bool is_bound;
81 	bool is_flushed;
82 	/* list of agp_memory mapped to the aperture */
83 	struct list_head mapped_list;
84 	/* DMA-mapped addresses */
85 	struct scatterlist *sg_list;
86 	int num_sg;
87 };
88 
89 #define AGP_NORMAL_MEMORY 0
90 
91 #define AGP_USER_TYPES (1 << 16)
92 #define AGP_USER_MEMORY (AGP_USER_TYPES)
93 #define AGP_USER_CACHED_MEMORY (AGP_USER_TYPES + 1)
94 
95 extern struct agp_bridge_data *agp_bridge;
96 extern struct list_head agp_bridges;
97 
98 extern struct agp_bridge_data *(*agp_find_bridge)(struct pci_dev *);
99 
100 extern void agp_free_memory(struct agp_memory *);
101 extern struct agp_memory *agp_allocate_memory(struct agp_bridge_data *, size_t, u32);
102 extern int agp_copy_info(struct agp_bridge_data *, struct agp_kern_info *);
103 extern int agp_bind_memory(struct agp_memory *, off_t);
104 extern int agp_unbind_memory(struct agp_memory *);
105 extern void agp_enable(struct agp_bridge_data *, u32);
106 extern struct agp_bridge_data *agp_backend_acquire(struct pci_dev *);
107 extern void agp_backend_release(struct agp_bridge_data *);
108 
109 #endif				/* _AGP_BACKEND_H */
110