linux/include/linux/agp_backend.h
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   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
  35enum chipset_type {
  36        NOT_SUPPORTED,
  37        SUPPORTED,
  38};
  39
  40struct agp_version {
  41        u16 major;
  42        u16 minor;
  43};
  44
  45struct 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
  67struct agp_bridge_data;
  68
  69struct 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
  95extern struct agp_bridge_data *agp_bridge;
  96extern struct list_head agp_bridges;
  97
  98extern struct agp_bridge_data *(*agp_find_bridge)(struct pci_dev *);
  99
 100extern void agp_free_memory(struct agp_memory *);
 101extern struct agp_memory *agp_allocate_memory(struct agp_bridge_data *, size_t, u32);
 102extern int agp_copy_info(struct agp_bridge_data *, struct agp_kern_info *);
 103extern int agp_bind_memory(struct agp_memory *, off_t);
 104extern int agp_unbind_memory(struct agp_memory *);
 105extern void agp_enable(struct agp_bridge_data *, u32);
 106extern struct agp_bridge_data *agp_backend_acquire(struct pci_dev *);
 107extern void agp_backend_release(struct agp_bridge_data *);
 108
 109#endif                          /* _AGP_BACKEND_H */
 110
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