include/linux/agp_backend.h

   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 */