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 fl_entry;
  46         struct list_head ml_entry;
  47         int free;
  48         unsigned long start;
  49         unsigned long size;
  50         struct drm_mm *mm;
  51         void *private;
  52 };
  53
  54 struct drm_mm {
  55         struct list_head fl_entry;
  56         struct list_head ml_entry;
  57         struct list_head unused_nodes;
  58         int num_unused;
  59         spinlock_t unused_lock;
  60 };
  61
  62 /*
  63  * Basic range manager support (drm_mm.c)
  64  */
  65 extern struct drm_mm_node *drm_mm_get_block_generic(struct drm_mm_node *node,
  66                                                     unsigned long size,
  67                                                     unsigned alignment,
  68                                                     int atomic);
  69 static inline struct drm_mm_node *drm_mm_get_block(struct drm_mm_node *parent,
  70                                                    unsigned long size,
  71                                                    unsigned alignment)
  72 {
  73         return drm_mm_get_block_generic(parent, size, alignment, 0);
  74 }
  75 static inline struct drm_mm_node *drm_mm_get_block_atomic(struct drm_mm_node *parent,
  76                                                           unsigned long size,
  77                                                           unsigned alignment)
  78 {
  79         return drm_mm_get_block_generic(parent, size, alignment, 1);
  80 }
  81 extern void drm_mm_put_block(struct drm_mm_node *cur);
  82 extern struct drm_mm_node *drm_mm_search_free(const struct drm_mm *mm,
  83                                               unsigned long size,
  84                                               unsigned alignment,
  85                                               int best_match);
  86 extern int drm_mm_init(struct drm_mm *mm, unsigned long start,
  87                        unsigned long size);
  88 extern void drm_mm_takedown(struct drm_mm *mm);
  89 extern int drm_mm_clean(struct drm_mm *mm);
  90 extern unsigned long drm_mm_tail_space(struct drm_mm *mm);
  91 extern int drm_mm_remove_space_from_tail(struct drm_mm *mm,
  92                                          unsigned long size);
  93 extern int drm_mm_add_space_to_tail(struct drm_mm *mm,
  94                                     unsigned long size, int atomic);
  95 extern int drm_mm_pre_get(struct drm_mm *mm);
  96
  97 static inline struct drm_mm *drm_get_mm(struct drm_mm_node *block)
  98 {
  99         return block->mm;
 100 }
 101
 102 #ifdef CONFIG_DEBUG_FS
 103 int drm_mm_dump_table(struct seq_file *m, struct drm_mm *mm);
 104 #endif
 105
 106 #endif