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