include/drm/drm_mm.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2006-2008 Tungsten Graphics, Inc., Cedar Park, TX. USA.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  21  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  22  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  24  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  *
  27  **************************************************************************/
  28 /*
  29  * Authors:
  30  * Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
  31  */
  32
  33 #ifndef _DRM_MM_H_
  34 #define _DRM_MM_H_
  35
  36 /*
  37  * Generic range manager structs
  38  */
  39 #include <linux/list.h>
  40 #ifdef CONFIG_DEBUG_FS
  41 #include <linux/seq_file.h>
  42 #endif
  43
  44 struct drm_mm_node {
  45         struct list_head free_stack;
  46         struct list_head node_list;
  47         unsigned free : 1;
  48         unsigned scanned_block : 1;
  49         unsigned scanned_prev_free : 1;
  50         unsigned scanned_next_free : 1;
  51         unsigned long start;
  52         unsigned long size;
  53         struct drm_mm *mm;
  54 };
  55
  56 struct drm_mm {
  57         /* List of free memory blocks, most recently freed ordered. */
  58         struct list_head free_stack;
  59         /* List of all memory nodes, ordered according to the (increasing) start
  60          * address of the memory node. */
  61         struct list_head node_list;
  62         struct list_head unused_nodes;
  63         int num_unused;
  64         spinlock_t unused_lock;
  65         unsigned scan_alignment;
  66         unsigned long scan_size;
  67         unsigned long scan_hit_start;
  68         unsigned scan_hit_size;
  69         unsigned scanned_blocks;
  70 };
  71
  72 /*
  73  * Basic range manager support (drm_mm.c)
  74  */
  75 extern struct drm_mm_node *drm_mm_get_block_generic(struct drm_mm_node *node,
  76                                                     unsigned long size,
  77                                                     unsigned alignment,
  78                                                     int atomic);
  79 extern struct drm_mm_node *drm_mm_get_block_range_generic(
  80                                                 struct drm_mm_node *node,
  81                                                 unsigned long size,
  82                                                 unsigned alignment,
  83                                                 unsigned long start,
  84                                                 unsigned long end,
  85                                                 int atomic);
  86 static inline struct drm_mm_node *drm_mm_get_block(struct drm_mm_node *parent,
  87                                                    unsigned long size,
  88                                                    unsigned alignment)
  89 {
  90         return drm_mm_get_block_generic(parent, size, alignment, 0);
  91 }
  92 static inline struct drm_mm_node *drm_mm_get_block_atomic(struct drm_mm_node *parent,
  93                                                           unsigned long size,
  94                                                           unsigned alignment)
  95 {
  96         return drm_mm_get_block_generic(parent, size, alignment, 1);
  97 }
  98 static inline struct drm_mm_node *drm_mm_get_block_range(
  99                                                 struct drm_mm_node *parent,
 100                                                 unsigned long size,
 101                                                 unsigned alignment,
 102                                                 unsigned long start,
 103                                                 unsigned long end)
 104 {
 105         return drm_mm_get_block_range_generic(parent, size, alignment,
 106                                                 start, end, 0);
 107 }
 108 static inline struct drm_mm_node *drm_mm_get_block_atomic_range(
 109                                                 struct drm_mm_node *parent,
 110                                                 unsigned long size,
 111                                                 unsigned alignment,
 112                                                 unsigned long start,
 113                                                 unsigned long end)
 114 {
 115         return drm_mm_get_block_range_generic(parent, size, alignment,
 116                                                 start, end, 1);
 117 }
 118 extern void drm_mm_put_block(struct drm_mm_node *cur);
 119 extern struct drm_mm_node *drm_mm_search_free(const struct drm_mm *mm,
 120                                               unsigned long size,
 121                                               unsigned alignment,
 122                                               int best_match);
 123 extern struct drm_mm_node *drm_mm_search_free_in_range(
 124                                                 const struct drm_mm *mm,
 125                                                 unsigned long size,
 126                                                 unsigned alignment,
 127                                                 unsigned long start,
 128                                                 unsigned long end,
 129                                                 int best_match);
 130 extern int drm_mm_init(struct drm_mm *mm, unsigned long start,
 131                        unsigned long size);
 132 extern void drm_mm_takedown(struct drm_mm *mm);
 133 extern int drm_mm_clean(struct drm_mm *mm);
 134 extern unsigned long drm_mm_tail_space(struct drm_mm *mm);
 135 extern int drm_mm_remove_space_from_tail(struct drm_mm *mm,
 136                                          unsigned long size);
 137 extern int drm_mm_add_space_to_tail(struct drm_mm *mm,
 138                                     unsigned long size, int atomic);
 139 extern int drm_mm_pre_get(struct drm_mm *mm);
 140
 141 static inline struct drm_mm *drm_get_mm(struct drm_mm_node *block)
 142 {
 143         return block->mm;
 144 }
 145
 146 void drm_mm_init_scan(struct drm_mm *mm, unsigned long size,
 147                       unsigned alignment);
 148 int drm_mm_scan_add_block(struct drm_mm_node *node);
 149 int drm_mm_scan_remove_block(struct drm_mm_node *node);
 150
 151 extern void drm_mm_debug_table(struct drm_mm *mm, const char *prefix);
 152 #ifdef CONFIG_DEBUG_FS
 153 int drm_mm_dump_table(struct seq_file *m, struct drm_mm *mm);
 154 #endif
 155
 156 #endif