LXR linux/include/drm/drm

   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 free_stack;
  46        struct list_head node_list;
  47        unsigned free : 1;
  48        unsigned scanned_block : 1;
  49        unsigned scanned_prev_free : 1;
  50        unsigned scanned_next_free : 1;
  51        unsigned long start;
  52        unsigned long size;
  53        struct drm_mm *mm;
  54};
  55
  56struct drm_mm {
  57        /* List of free memory blocks, most recently freed ordered. */
  58        struct list_head free_stack;
  59        /* List of all memory nodes, ordered according to the (increasing) start
  60         * address of the memory node. */
  61        struct list_head node_list;
  62        struct list_head unused_nodes;
  63        int num_unused;
  64        spinlock_t unused_lock;
  65        unsigned int scan_check_range : 1;
  66        unsigned scan_alignment;
  67        unsigned long scan_size;
  68        unsigned long scan_hit_start;
  69        unsigned scan_hit_size;
  70        unsigned scanned_blocks;
  71        unsigned long scan_start;
  72        unsigned long scan_end;
  73};
  74
  75/*
  76 * Basic range manager support (drm_mm.c)
  77 */
  78extern struct drm_mm_node *drm_mm_get_block_generic(struct drm_mm_node *node,
  79                                                    unsigned long size,
  80                                                    unsigned alignment,
  81                                                    int atomic);
  82extern struct drm_mm_node *drm_mm_get_block_range_generic(
  83                                                struct drm_mm_node *node,
  84                                                unsigned long size,
  85                                                unsigned alignment,
  86                                                unsigned long start,
  87                                                unsigned long end,
  88                                                int atomic);
  89static inline struct drm_mm_node *drm_mm_get_block(struct drm_mm_node *parent,
  90                                                   unsigned long size,
  91                                                   unsigned alignment)
  92{
  93        return drm_mm_get_block_generic(parent, size, alignment, 0);
  94}
  95static inline struct drm_mm_node *drm_mm_get_block_atomic(struct drm_mm_node *parent,
  96                                                          unsigned long size,
  97                                                          unsigned alignment)
  98{
  99        return drm_mm_get_block_generic(parent, size, alignment, 1);
 100}
 101static inline struct drm_mm_node *drm_mm_get_block_range(
 102                                                struct drm_mm_node *parent,
 103                                                unsigned long size,
 104                                                unsigned alignment,
 105                                                unsigned long start,
 106                                                unsigned long end)
 107{
 108        return drm_mm_get_block_range_generic(parent, size, alignment,
 109                                                start, end, 0);
 110}
 111static inline struct drm_mm_node *drm_mm_get_block_atomic_range(
 112                                                struct drm_mm_node *parent,
 113                                                unsigned long size,
 114                                                unsigned alignment,
 115                                                unsigned long start,
 116                                                unsigned long end)
 117{
 118        return drm_mm_get_block_range_generic(parent, size, alignment,
 119                                                start, end, 1);
 120}
 121extern void drm_mm_put_block(struct drm_mm_node *cur);
 122extern struct drm_mm_node *drm_mm_search_free(const struct drm_mm *mm,
 123                                              unsigned long size,
 124                                              unsigned alignment,
 125                                              int best_match);
 126extern struct drm_mm_node *drm_mm_search_free_in_range(
 127                                                const struct drm_mm *mm,
 128                                                unsigned long size,
 129                                                unsigned alignment,
 130                                                unsigned long start,
 131                                                unsigned long end,
 132                                                int best_match);
 133extern int drm_mm_init(struct drm_mm *mm, unsigned long start,
 134                       unsigned long size);
 135extern void drm_mm_takedown(struct drm_mm *mm);
 136extern int drm_mm_clean(struct drm_mm *mm);
 137extern unsigned long drm_mm_tail_space(struct drm_mm *mm);
 138extern int drm_mm_remove_space_from_tail(struct drm_mm *mm,
 139                                         unsigned long size);
 140extern int drm_mm_add_space_to_tail(struct drm_mm *mm,
 141                                    unsigned long size, int atomic);
 142extern int drm_mm_pre_get(struct drm_mm *mm);
 143
 144static inline struct drm_mm *drm_get_mm(struct drm_mm_node *block)
 145{
 146        return block->mm;
 147}
 148
 149void drm_mm_init_scan(struct drm_mm *mm, unsigned long size,
 150                      unsigned alignment);
 151void drm_mm_init_scan_with_range(struct drm_mm *mm, unsigned long size,
 152                                 unsigned alignment,
 153                                 unsigned long start,
 154                                 unsigned long end);
 155int drm_mm_scan_add_block(struct drm_mm_node *node);
 156int drm_mm_scan_remove_block(struct drm_mm_node *node);
 157
 158extern void drm_mm_debug_table(struct drm_mm *mm, const char *prefix);
 159#ifdef CONFIG_DEBUG_FS
 160int drm_mm_dump_table(struct seq_file *m, struct drm_mm *mm);
 161#endif
 162
 163#endif
 164