sys/dev/drm2/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  * $FreeBSD: src/sys/dev/drm2/drm_mm.h,v 1.1 2012/05/22 11:07:44 kib Exp $
  28  **************************************************************************/
  29
  30 /*
  31  * Authors:
  32  * Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
  33  */
  34
  35 #ifndef _DRM_MM_H_
  36 #define _DRM_MM_H_
  37
  38 #include <dev/drm2/drm_linux_list.h>
  39
  40 struct drm_mm_node {
  41         struct list_head node_list;
  42         struct list_head hole_stack;
  43         unsigned hole_follows : 1;
  44         unsigned scanned_block : 1;
  45         unsigned scanned_prev_free : 1;
  46         unsigned scanned_next_free : 1;
  47         unsigned scanned_preceeds_hole : 1;
  48         unsigned allocated : 1;
  49         unsigned long start;
  50         unsigned long size;
  51         struct drm_mm *mm;
  52         void *private;
  53 };
  54
  55 struct drm_mm {
  56         struct list_head hole_stack;
  57         struct drm_mm_node head_node;
  58         struct list_head unused_nodes;
  59         int num_unused;
  60         struct spinlock unused_spin;
  61         unsigned int scan_check_range : 1;
  62         unsigned scan_alignment;
  63         unsigned long scan_size;
  64         unsigned long scan_hit_start;
  65         unsigned scan_hit_size;
  66         unsigned scanned_blocks;
  67         unsigned long scan_start;
  68         unsigned long scan_end;
  69         struct drm_mm_node *prev_scanned_node;
  70 };
  71
  72 static inline bool drm_mm_node_allocated(struct drm_mm_node *node)
  73 {
  74         return node->allocated;
  75 }
  76
  77 static inline bool drm_mm_initialized(struct drm_mm *mm)
  78 {
  79         return (mm->hole_stack.next != NULL);
  80 }
  81 #define drm_mm_for_each_node(entry, mm) list_for_each_entry(entry, \
  82                                                 &(mm)->head_node.node_list, \
  83                                                 node_list)
  84 #define drm_mm_for_each_scanned_node_reverse(entry, n, mm) \
  85         for (entry = (mm)->prev_scanned_node, \
  86                 next = entry ? list_entry(entry->node_list.next, \
  87                         struct drm_mm_node, node_list) : NULL; \
  88              entry != NULL; entry = next, \
  89                 next = entry ? list_entry(entry->node_list.next, \
  90                         struct drm_mm_node, node_list) : NULL)
  91
  92 /*
  93  * Basic range manager support (drm_mm.c)
  94  */
  95 extern struct drm_mm_node *drm_mm_get_block_generic(struct drm_mm_node *node,
  96                                                     unsigned long size,
  97                                                     unsigned alignment,
  98                                                     int atomic);
  99 extern struct drm_mm_node *drm_mm_get_block_range_generic(
 100                                                 struct drm_mm_node *node,
 101                                                 unsigned long size,
 102                                                 unsigned alignment,
 103                                                 unsigned long start,
 104                                                 unsigned long end,
 105                                                 int atomic);
 106 static inline struct drm_mm_node *drm_mm_get_block(struct drm_mm_node *parent,
 107                                                    unsigned long size,
 108                                                    unsigned alignment)
 109 {
 110         return drm_mm_get_block_generic(parent, size, alignment, 0);
 111 }
 112 static inline struct drm_mm_node *drm_mm_get_block_atomic(struct drm_mm_node *parent,
 113                                                           unsigned long size,
 114                                                           unsigned alignment)
 115 {
 116         return drm_mm_get_block_generic(parent, size, alignment, 1);
 117 }
 118 static inline struct drm_mm_node *drm_mm_get_block_range(
 119                                                 struct drm_mm_node *parent,
 120                                                 unsigned long size,
 121                                                 unsigned alignment,
 122                                                 unsigned long start,
 123                                                 unsigned long end)
 124 {
 125         return drm_mm_get_block_range_generic(parent, size, alignment,
 126                                                 start, end, 0);
 127 }
 128 static inline struct drm_mm_node *drm_mm_get_block_atomic_range(
 129                                                 struct drm_mm_node *parent,
 130                                                 unsigned long size,
 131                                                 unsigned alignment,
 132                                                 unsigned long start,
 133                                                 unsigned long end)
 134 {
 135         return drm_mm_get_block_range_generic(parent, size, alignment,
 136                                                 start, end, 1);
 137 }
 138 extern int drm_mm_insert_node(struct drm_mm *mm, struct drm_mm_node *node,
 139                               unsigned long size, unsigned alignment);
 140 extern int drm_mm_insert_node_in_range(struct drm_mm *mm,
 141                                        struct drm_mm_node *node,
 142                                        unsigned long size, unsigned alignment,
 143                                        unsigned long start, unsigned long end);
 144 extern void drm_mm_put_block(struct drm_mm_node *cur);
 145 extern void drm_mm_remove_node(struct drm_mm_node *node);
 146 extern void drm_mm_replace_node(struct drm_mm_node *old, struct drm_mm_node *new);
 147 extern struct drm_mm_node *drm_mm_search_free(const struct drm_mm *mm,
 148                                               unsigned long size,
 149                                               unsigned alignment,
 150                                               int best_match);
 151 extern struct drm_mm_node *drm_mm_search_free_in_range(
 152                                                 const struct drm_mm *mm,
 153                                                 unsigned long size,
 154                                                 unsigned alignment,
 155                                                 unsigned long start,
 156                                                 unsigned long end,
 157                                                 int best_match);
 158 extern int drm_mm_init(struct drm_mm *mm, unsigned long start,
 159                        unsigned long size);
 160 extern void drm_mm_takedown(struct drm_mm *mm);
 161 extern int drm_mm_clean(struct drm_mm *mm);
 162 extern unsigned long drm_mm_tail_space(struct drm_mm *mm);
 163 extern int drm_mm_remove_space_from_tail(struct drm_mm *mm,
 164                                          unsigned long size);
 165 extern int drm_mm_add_space_to_tail(struct drm_mm *mm,
 166                                     unsigned long size, int atomic);
 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 #endif