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 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 56 struct 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 */ 78 extern struct drm_mm_node *drm_mm_get_block_generic(struct drm_mm_node *node, 79 unsigned long size, 80 unsigned alignment, 81 int atomic); 82 extern 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); 89 static 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 } 95 static 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 } 101 static 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 } 111 static 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 } 121 extern void drm_mm_put_block(struct drm_mm_node *cur); 122 extern struct drm_mm_node *drm_mm_search_free(const struct drm_mm *mm, 123 unsigned long size, 124 unsigned alignment, 125 int best_match); 126 extern 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); 133 extern int drm_mm_init(struct drm_mm *mm, unsigned long start, 134 unsigned long size); 135 extern void drm_mm_takedown(struct drm_mm *mm); 136 extern int drm_mm_clean(struct drm_mm *mm); 137 extern unsigned long drm_mm_tail_space(struct drm_mm *mm); 138 extern int drm_mm_remove_space_from_tail(struct drm_mm *mm, 139 unsigned long size); 140 extern int drm_mm_add_space_to_tail(struct drm_mm *mm, 141 unsigned long size, int atomic); 142 extern int drm_mm_pre_get(struct drm_mm *mm); 143 144 static inline struct drm_mm *drm_get_mm(struct drm_mm_node *block) 145 { 146 return block->mm; 147 } 148 149 void drm_mm_init_scan(struct drm_mm *mm, unsigned long size, 150 unsigned alignment); 151 void drm_mm_init_scan_with_range(struct drm_mm *mm, unsigned long size, 152 unsigned alignment, 153 unsigned long start, 154 unsigned long end); 155 int drm_mm_scan_add_block(struct drm_mm_node *node); 156 int drm_mm_scan_remove_block(struct drm_mm_node *node); 157 158 extern void drm_mm_debug_table(struct drm_mm *mm, const char *prefix); 159 #ifdef CONFIG_DEBUG_FS 160 int drm_mm_dump_table(struct seq_file *m, struct drm_mm *mm); 161 #endif 162 163 #endif 164