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 color;
  54         unsigned long start;
  55         unsigned long size;
  56         struct drm_mm *mm;
  57 };
  58
  59 struct drm_mm {
  60         /* List of all memory nodes that immediately precede a free hole. */
  61         struct list_head hole_stack;
  62         /* head_node.node_list is the list of all memory nodes, ordered
  63          * according to the (increasing) start address of the memory node. */
  64         struct drm_mm_node head_node;
  65         struct list_head unused_nodes;
  66         int num_unused;
  67         spinlock_t unused_lock;
  68         unsigned int scan_check_range : 1;
  69         unsigned scan_alignment;
  70         unsigned long scan_color;
  71         unsigned long scan_size;
  72         unsigned long scan_hit_start;
  73         unsigned scan_hit_size;
  74         unsigned scanned_blocks;
  75         unsigned long scan_start;
  76         unsigned long scan_end;
  77         struct drm_mm_node *prev_scanned_node;
  78
  79         void (*color_adjust)(struct drm_mm_node *node, unsigned long color,
  80                              unsigned long *start, unsigned long *end);
  81 };
  82
  83 static inline bool drm_mm_node_allocated(struct drm_mm_node *node)
  84 {
  85         return node->allocated;
  86 }
  87
  88 static inline bool drm_mm_initialized(struct drm_mm *mm)
  89 {
  90         return mm->hole_stack.next;
  91 }
  92 #define drm_mm_for_each_node(entry, mm) list_for_each_entry(entry, \
  93                                                 &(mm)->head_node.node_list, \
  94                                                 node_list)
  95 #define drm_mm_for_each_scanned_node_reverse(entry, n, mm) \
  96         for (entry = (mm)->prev_scanned_node, \
  97                 next = entry ? list_entry(entry->node_list.next, \
  98                         struct drm_mm_node, node_list) : NULL; \
  99              entry != NULL; entry = next, \
 100                 next = entry ? list_entry(entry->node_list.next, \
 101                         struct drm_mm_node, node_list) : NULL) \
 102 /*
 103  * Basic range manager support (drm_mm.c)
 104  */
 105 extern struct drm_mm_node *drm_mm_get_block_generic(struct drm_mm_node *node,
 106                                                     unsigned long size,
 107                                                     unsigned alignment,
 108                                                     unsigned long color,
 109                                                     int atomic);
 110 extern struct drm_mm_node *drm_mm_get_block_range_generic(
 111                                                 struct drm_mm_node *node,
 112                                                 unsigned long size,
 113                                                 unsigned alignment,
 114                                                 unsigned long color,
 115                                                 unsigned long start,
 116                                                 unsigned long end,
 117                                                 int atomic);
 118 static inline struct drm_mm_node *drm_mm_get_block(struct drm_mm_node *parent,
 119                                                    unsigned long size,
 120                                                    unsigned alignment)
 121 {
 122         return drm_mm_get_block_generic(parent, size, alignment, 0, 0);
 123 }
 124 static inline struct drm_mm_node *drm_mm_get_block_atomic(struct drm_mm_node *parent,
 125                                                           unsigned long size,
 126                                                           unsigned alignment)
 127 {
 128         return drm_mm_get_block_generic(parent, size, alignment, 0, 1);
 129 }
 130 static inline struct drm_mm_node *drm_mm_get_block_range(
 131                                                 struct drm_mm_node *parent,
 132                                                 unsigned long size,
 133                                                 unsigned alignment,
 134                                                 unsigned long start,
 135                                                 unsigned long end)
 136 {
 137         return drm_mm_get_block_range_generic(parent, size, alignment, 0,
 138                                               start, end, 0);
 139 }
 140 static inline struct drm_mm_node *drm_mm_get_color_block_range(
 141                                                 struct drm_mm_node *parent,
 142                                                 unsigned long size,
 143                                                 unsigned alignment,
 144                                                 unsigned long color,
 145                                                 unsigned long start,
 146                                                 unsigned long end)
 147 {
 148         return drm_mm_get_block_range_generic(parent, size, alignment, color,
 149                                               start, end, 0);
 150 }
 151 static inline struct drm_mm_node *drm_mm_get_block_atomic_range(
 152                                                 struct drm_mm_node *parent,
 153                                                 unsigned long size,
 154                                                 unsigned alignment,
 155                                                 unsigned long start,
 156                                                 unsigned long end)
 157 {
 158         return drm_mm_get_block_range_generic(parent, size, alignment, 0,
 159                                                 start, end, 1);
 160 }
 161 extern int drm_mm_insert_node(struct drm_mm *mm, struct drm_mm_node *node,
 162                               unsigned long size, unsigned alignment);
 163 extern int drm_mm_insert_node_in_range(struct drm_mm *mm,
 164                                        struct drm_mm_node *node,
 165                                        unsigned long size, unsigned alignment,
 166                                        unsigned long start, unsigned long end);
 167 extern void drm_mm_put_block(struct drm_mm_node *cur);
 168 extern void drm_mm_remove_node(struct drm_mm_node *node);
 169 extern void drm_mm_replace_node(struct drm_mm_node *old, struct drm_mm_node *new);
 170 extern struct drm_mm_node *drm_mm_search_free_generic(const struct drm_mm *mm,
 171                                                       unsigned long size,
 172                                                       unsigned alignment,
 173                                                       unsigned long color,
 174                                                       bool best_match);
 175 extern struct drm_mm_node *drm_mm_search_free_in_range_generic(
 176                                                 const struct drm_mm *mm,
 177                                                 unsigned long size,
 178                                                 unsigned alignment,
 179                                                 unsigned long color,
 180                                                 unsigned long start,
 181                                                 unsigned long end,
 182                                                 bool best_match);
 183 static inline struct drm_mm_node *drm_mm_search_free(const struct drm_mm *mm,
 184                                                      unsigned long size,
 185                                                      unsigned alignment,
 186                                                      bool best_match)
 187 {
 188         return drm_mm_search_free_generic(mm,size, alignment, 0, best_match);
 189 }
 190 static inline  struct drm_mm_node *drm_mm_search_free_in_range(
 191                                                 const struct drm_mm *mm,
 192                                                 unsigned long size,
 193                                                 unsigned alignment,
 194                                                 unsigned long start,
 195                                                 unsigned long end,
 196                                                 bool best_match)
 197 {
 198         return drm_mm_search_free_in_range_generic(mm, size, alignment, 0,
 199                                                    start, end, best_match);
 200 }
 201 static inline struct drm_mm_node *drm_mm_search_free_color(const struct drm_mm *mm,
 202                                                            unsigned long size,
 203                                                            unsigned alignment,
 204                                                            unsigned long color,
 205                                                            bool best_match)
 206 {
 207         return drm_mm_search_free_generic(mm,size, alignment, color, best_match);
 208 }
 209 static inline  struct drm_mm_node *drm_mm_search_free_in_range_color(
 210                                                 const struct drm_mm *mm,
 211                                                 unsigned long size,
 212                                                 unsigned alignment,
 213                                                 unsigned long color,
 214                                                 unsigned long start,
 215                                                 unsigned long end,
 216                                                 bool best_match)
 217 {
 218         return drm_mm_search_free_in_range_generic(mm, size, alignment, color,
 219                                                    start, end, best_match);
 220 }
 221 extern int drm_mm_init(struct drm_mm *mm,
 222                        unsigned long start,
 223                        unsigned long size);
 224 extern void drm_mm_takedown(struct drm_mm *mm);
 225 extern int drm_mm_clean(struct drm_mm *mm);
 226 extern int drm_mm_pre_get(struct drm_mm *mm);
 227
 228 static inline struct drm_mm *drm_get_mm(struct drm_mm_node *block)
 229 {
 230         return block->mm;
 231 }
 232
 233 void drm_mm_init_scan(struct drm_mm *mm,
 234                       unsigned long size,
 235                       unsigned alignment,
 236                       unsigned long color);
 237 void drm_mm_init_scan_with_range(struct drm_mm *mm,
 238                                  unsigned long size,
 239                                  unsigned alignment,
 240                                  unsigned long color,
 241                                  unsigned long start,
 242                                  unsigned long end);
 243 int drm_mm_scan_add_block(struct drm_mm_node *node);
 244 int drm_mm_scan_remove_block(struct drm_mm_node *node);
 245
 246 extern void drm_mm_debug_table(struct drm_mm *mm, const char *prefix);
 247 #ifdef CONFIG_DEBUG_FS
 248 int drm_mm_dump_table(struct seq_file *m, struct drm_mm *mm);
 249 #endif
 250
 251 #endif