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 scan_alignment; 66 unsigned long scan_size; 67 unsigned long scan_hit_start; 68 unsigned scan_hit_size; 69 unsigned scanned_blocks; 70 }; 71 72 /* 73 * Basic range manager support (drm_mm.c) 74 */ 75 extern struct drm_mm_node *drm_mm_get_block_generic(struct drm_mm_node *node, 76 unsigned long size, 77 unsigned alignment, 78 int atomic); 79 extern struct drm_mm_node *drm_mm_get_block_range_generic( 80 struct drm_mm_node *node, 81 unsigned long size, 82 unsigned alignment, 83 unsigned long start, 84 unsigned long end, 85 int atomic); 86 static inline struct drm_mm_node *drm_mm_get_block(struct drm_mm_node *parent, 87 unsigned long size, 88 unsigned alignment) 89 { 90 return drm_mm_get_block_generic(parent, size, alignment, 0); 91 } 92 static inline struct drm_mm_node *drm_mm_get_block_atomic(struct drm_mm_node *parent, 93 unsigned long size, 94 unsigned alignment) 95 { 96 return drm_mm_get_block_generic(parent, size, alignment, 1); 97 } 98 static inline struct drm_mm_node *drm_mm_get_block_range( 99 struct drm_mm_node *parent, 100 unsigned long size, 101 unsigned alignment, 102 unsigned long start, 103 unsigned long end) 104 { 105 return drm_mm_get_block_range_generic(parent, size, alignment, 106 start, end, 0); 107 } 108 static inline struct drm_mm_node *drm_mm_get_block_atomic_range( 109 struct drm_mm_node *parent, 110 unsigned long size, 111 unsigned alignment, 112 unsigned long start, 113 unsigned long end) 114 { 115 return drm_mm_get_block_range_generic(parent, size, alignment, 116 start, end, 1); 117 } 118 extern void drm_mm_put_block(struct drm_mm_node *cur); 119 extern struct drm_mm_node *drm_mm_search_free(const struct drm_mm *mm, 120 unsigned long size, 121 unsigned alignment, 122 int best_match); 123 extern struct drm_mm_node *drm_mm_search_free_in_range( 124 const struct drm_mm *mm, 125 unsigned long size, 126 unsigned alignment, 127 unsigned long start, 128 unsigned long end, 129 int best_match); 130 extern int drm_mm_init(struct drm_mm *mm, unsigned long start, 131 unsigned long size); 132 extern void drm_mm_takedown(struct drm_mm *mm); 133 extern int drm_mm_clean(struct drm_mm *mm); 134 extern unsigned long drm_mm_tail_space(struct drm_mm *mm); 135 extern int drm_mm_remove_space_from_tail(struct drm_mm *mm, 136 unsigned long size); 137 extern int drm_mm_add_space_to_tail(struct drm_mm *mm, 138 unsigned long size, int atomic); 139 extern int drm_mm_pre_get(struct drm_mm *mm); 140 141 static inline struct drm_mm *drm_get_mm(struct drm_mm_node *block) 142 { 143 return block->mm; 144 } 145 146 void drm_mm_init_scan(struct drm_mm *mm, unsigned long size, 147 unsigned alignment); 148 int drm_mm_scan_add_block(struct drm_mm_node *node); 149 int drm_mm_scan_remove_block(struct drm_mm_node *node); 150 151 extern void drm_mm_debug_table(struct drm_mm *mm, const char *prefix); 152 #ifdef CONFIG_DEBUG_FS 153 int drm_mm_dump_table(struct seq_file *m, struct drm_mm *mm); 154 #endif 155 156 #endif 157