include/linux/agp_backend.h

   1 /*
   2  * AGPGART backend specific includes. Not for userspace consumption.
   3  *
   4  * Copyright (C) 2002-2003 Dave Jones
   5  * Copyright (C) 1999 Jeff Hartmann
   6  * Copyright (C) 1999 Precision Insight, Inc.
   7  * Copyright (C) 1999 Xi Graphics, Inc.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * JEFF HARTMANN, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM,
  23  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  24  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
  25  * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  */
  28
  29 #ifndef _AGP_BACKEND_H
  30 #define _AGP_BACKEND_H 1
  31
  32 #ifdef __KERNEL__
  33
  34 #ifndef TRUE
  35 #define TRUE 1
  36 #endif
  37
  38 #ifndef FALSE
  39 #define FALSE 0
  40 #endif
  41
  42 enum chipset_type {
  43         NOT_SUPPORTED,
  44         SUPPORTED,
  45 };
  46
  47 struct agp_version {
  48         u16 major;
  49         u16 minor;
  50 };
  51
  52 struct agp_kern_info {
  53         struct agp_version version;
  54         struct pci_dev *device;
  55         enum chipset_type chipset;
  56         unsigned long mode;
  57         off_t aper_base;
  58         size_t aper_size;
  59         int max_memory;         /* In pages */
  60         int current_memory;
  61         int cant_use_aperture;
  62         unsigned long page_mask;
  63         struct vm_operations_struct *vm_ops;
  64 };
  65
  66 /*
  67  * The agp_memory structure has information about the block of agp memory
  68  * allocated.  A caller may manipulate the next and prev pointers to link
  69  * each allocated item into a list.  These pointers are ignored by the backend.
  70  * Everything else should never be written to, but the caller may read any of
  71  * the items to detrimine the status of this block of agp memory.
  72  */
  73
  74 struct agp_memory {
  75         int key;
  76         struct agp_memory *next;
  77         struct agp_memory *prev;
  78         size_t page_count;
  79         int num_scratch_pages;
  80         unsigned long *memory;
  81         off_t pg_start;
  82         u32 type;
  83         u32 physical;
  84         u8 is_bound;
  85         u8 is_flushed;
  86 };
  87
  88 #define AGP_NORMAL_MEMORY 0
  89
  90 extern void agp_free_memory(struct agp_memory *);
  91 extern struct agp_memory *agp_allocate_memory(size_t, u32);
  92 extern int agp_copy_info(struct agp_kern_info *);
  93 extern int agp_bind_memory(struct agp_memory *, off_t);
  94 extern int agp_unbind_memory(struct agp_memory *);
  95 extern void agp_enable(u32);
  96 extern int agp_backend_acquire(void);
  97 extern void agp_backend_release(void);
  98
  99 /*
 100  * Interface between drm and agp code.  When agp initializes, it makes
 101  * the below structure available via inter_module_register(), drm might
 102  * use it.  Keith Owens <kaos@ocs.com.au> 28 Oct 2000.
 103  */
 104 typedef struct {
 105         void                    (*free_memory)(struct agp_memory *);
 106         struct agp_memory *     (*allocate_memory)(size_t, u32);
 107         int                     (*bind_memory)(struct agp_memory *, off_t);
 108         int                     (*unbind_memory)(struct agp_memory *);
 109         void                    (*enable)(u32);
 110         int                     (*acquire)(void);
 111         void                    (*release)(void);
 112         int                     (*copy_info)(struct agp_kern_info *);
 113 } drm_agp_t;
 114
 115 extern const drm_agp_t *drm_agp_p;
 116
 117 #endif                          /* __KERNEL__ */
 118 #endif                          /* _AGP_BACKEND_H */