linux/include/drm/drm_mm.h
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   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
  44struct 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
  59struct 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
  83static inline bool drm_mm_node_allocated(struct drm_mm_node *node)
  84{
  85        return node->allocated;
  86}
  87
  88static 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 */
 105extern 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);
 110extern 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);
 118static 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}
 124static 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}
 130static 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}
 140static 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}
 151static 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}
 161extern int drm_mm_insert_node(struct drm_mm *mm, struct drm_mm_node *node,
 162                              unsigned long size, unsigned alignment);
 163extern 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);
 167extern void drm_mm_put_block(struct drm_mm_node *cur);
 168extern void drm_mm_remove_node(struct drm_mm_node *node);
 169extern void drm_mm_replace_node(struct drm_mm_node *old, struct drm_mm_node *new);
 170extern 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);
 175extern 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);
 183static 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}
 190static 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}
 201static 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}
 209static 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}
 221extern int drm_mm_init(struct drm_mm *mm,
 222                       unsigned long start,
 223                       unsigned long size);
 224extern void drm_mm_takedown(struct drm_mm *mm);
 225extern int drm_mm_clean(struct drm_mm *mm);
 226extern int drm_mm_pre_get(struct drm_mm *mm);
 227
 228static inline struct drm_mm *drm_get_mm(struct drm_mm_node *block)
 229{
 230        return block->mm;
 231}
 232
 233void drm_mm_init_scan(struct drm_mm *mm,
 234                      unsigned long size,
 235                      unsigned alignment,
 236                      unsigned long color);
 237void 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);
 243int drm_mm_scan_add_block(struct drm_mm_node *node);
 244int drm_mm_scan_remove_block(struct drm_mm_node *node);
 245
 246extern void drm_mm_debug_table(struct drm_mm *mm, const char *prefix);
 247#ifdef CONFIG_DEBUG_FS
 248int drm_mm_dump_table(struct seq_file *m, struct drm_mm *mm);
 249#endif
 250
 251#endif
 252
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