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 node_list;
  46         struct list_head hole_stack;
  47         unsigned hole_follows : 1;
  48         unsigned scanned_block : 1;
  49         unsigned scanned_prev_free : 1;
  50         unsigned scanned_next_free : 1;
  51         unsigned scanned_preceeds_hole : 1;
  52         unsigned allocated : 1;
  53         unsigned long start;
  54         unsigned long size;
  55         struct drm_mm *mm;
  56 };
  57
  58 struct drm_mm {
  59         /* List of all memory nodes that immediately precede a free hole. */
  60         struct list_head hole_stack;
  61         /* head_node.node_list is the list of all memory nodes, ordered
  62          * according to the (increasing) start address of the memory node. */
  63         struct drm_mm_node head_node;
  64         struct list_head unused_nodes;
  65         int num_unused;
  66         spinlock_t unused_lock;
  67         unsigned int scan_check_range : 1;
  68         unsigned scan_alignment;
  69         unsigned long scan_size;
  70         unsigned long scan_hit_start;
  71         unsigned scan_hit_size;
  72         unsigned scanned_blocks;
  73         unsigned long scan_start;
  74         unsigned long scan_end;
  75         struct drm_mm_node *prev_scanned_node;
  76 };
  77
  78 static inline bool drm_mm_node_allocated(struct drm_mm_node *node)
  79 {
  80         return node->allocated;
  81 }
  82
  83 static inline bool drm_mm_initialized(struct drm_mm *mm)
  84 {
  85         return mm->hole_stack.next;
  86 }
  87 #define drm_mm_for_each_node(entry, mm) list_for_each_entry(entry, \
  88                                                 &(mm)->head_node.node_list, \
  89                                                 node_list)
  90 #define drm_mm_for_each_scanned_node_reverse(entry, n, mm) \
  91         for (entry = (mm)->prev_scanned_node, \
  92                 next = entry ? list_entry(entry->node_list.next, \
  93                         struct drm_mm_node, node_list) : NULL; \
  94              entry != NULL; entry = next, \
  95                 next = entry ? list_entry(entry->node_list.next, \
  96                         struct drm_mm_node, node_list) : NULL) \
  97 /*
  98  * Basic range manager support (drm_mm.c)
  99  */
 100 extern struct drm_mm_node *drm_mm_get_block_generic(struct drm_mm_node *node,
 101                                                     unsigned long size,
 102                                                     unsigned alignment,
 103                                                     int atomic);
 104 extern struct drm_mm_node *drm_mm_get_block_range_generic(
 105                                                 struct drm_mm_node *node,
 106                                                 unsigned long size,
 107                                                 unsigned alignment,
 108                                                 unsigned long start,
 109                                                 unsigned long end,
 110                                                 int atomic);
 111 static inline struct drm_mm_node *drm_mm_get_block(struct drm_mm_node *parent,
 112                                                    unsigned long size,
 113                                                    unsigned alignment)
 114 {
 115         return drm_mm_get_block_generic(parent, size, alignment, 0);
 116 }
 117 static inline struct drm_mm_node *drm_mm_get_block_atomic(struct drm_mm_node *parent,
 118                                                           unsigned long size,
 119                                                           unsigned alignment)
 120 {
 121         return drm_mm_get_block_generic(parent, size, alignment, 1);
 122 }
 123 static inline struct drm_mm_node *drm_mm_get_block_range(
 124                                                 struct drm_mm_node *parent,
 125                                                 unsigned long size,
 126                                                 unsigned alignment,
 127                                                 unsigned long start,
 128                                                 unsigned long end)
 129 {
 130         return drm_mm_get_block_range_generic(parent, size, alignment,
 131                                                 start, end, 0);
 132 }
 133 static inline struct drm_mm_node *drm_mm_get_block_atomic_range(
 134                                                 struct drm_mm_node *parent,
 135                                                 unsigned long size,
 136                                                 unsigned alignment,
 137                                                 unsigned long start,
 138                                                 unsigned long end)
 139 {
 140         return drm_mm_get_block_range_generic(parent, size, alignment,
 141                                                 start, end, 1);
 142 }
 143 extern int drm_mm_insert_node(struct drm_mm *mm, struct drm_mm_node *node,
 144                               unsigned long size, unsigned alignment);
 145 extern int drm_mm_insert_node_in_range(struct drm_mm *mm,
 146                                        struct drm_mm_node *node,
 147                                        unsigned long size, unsigned alignment,
 148                                        unsigned long start, unsigned long end);
 149 extern void drm_mm_put_block(struct drm_mm_node *cur);
 150 extern void drm_mm_remove_node(struct drm_mm_node *node);
 151 extern void drm_mm_replace_node(struct drm_mm_node *old, struct drm_mm_node *new);
 152 extern struct drm_mm_node *drm_mm_search_free(const struct drm_mm *mm,
 153                                               unsigned long size,
 154                                               unsigned alignment,
 155                                               int best_match);
 156 extern struct drm_mm_node *drm_mm_search_free_in_range(
 157                                                 const struct drm_mm *mm,
 158                                                 unsigned long size,
 159                                                 unsigned alignment,
 160                                                 unsigned long start,
 161                                                 unsigned long end,
 162                                                 int best_match);
 163 extern int drm_mm_init(struct drm_mm *mm, unsigned long start,
 164                        unsigned long size);
 165 extern void drm_mm_takedown(struct drm_mm *mm);
 166 extern int drm_mm_clean(struct drm_mm *mm);
 167 extern int drm_mm_pre_get(struct drm_mm *mm);
 168
 169 static inline struct drm_mm *drm_get_mm(struct drm_mm_node *block)
 170 {
 171         return block->mm;
 172 }
 173
 174 void drm_mm_init_scan(struct drm_mm *mm, unsigned long size,
 175                       unsigned alignment);
 176 void drm_mm_init_scan_with_range(struct drm_mm *mm, unsigned long size,
 177                                  unsigned alignment,
 178                                  unsigned long start,
 179                                  unsigned long end);
 180 int drm_mm_scan_add_block(struct drm_mm_node *node);
 181 int drm_mm_scan_remove_block(struct drm_mm_node *node);
 182
 183 extern void drm_mm_debug_table(struct drm_mm *mm, const char *prefix);
 184 #ifdef CONFIG_DEBUG_FS
 185 int drm_mm_dump_table(struct seq_file *m, struct drm_mm *mm);
 186 #endif
 187
 188 #endif