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 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 start; 54 unsigned long size; 55 struct drm_mm *mm; 56 }; 57 58 struct drm_mm { 59 /* List of all memory nodes that immediately precede a free hole. */ 60 struct list_head hole_stack; 61 /* head_node.node_list is the list of all memory nodes, ordered 62 * according to the (increasing) start address of the memory node. */ 63 struct drm_mm_node head_node; 64 struct list_head unused_nodes; 65 int num_unused; 66 spinlock_t unused_lock; 67 unsigned int scan_check_range : 1; 68 unsigned scan_alignment; 69 unsigned long scan_size; 70 unsigned long scan_hit_start; 71 unsigned scan_hit_size; 72 unsigned scanned_blocks; 73 unsigned long scan_start; 74 unsigned long scan_end; 75 struct drm_mm_node *prev_scanned_node; 76 }; 77 78 static inline bool drm_mm_node_allocated(struct drm_mm_node *node) 79 { 80 return node->allocated; 81 } 82 83 static inline bool drm_mm_initialized(struct drm_mm *mm) 84 { 85 return mm->hole_stack.next; 86 } 87 #define drm_mm_for_each_node(entry, mm) list_for_each_entry(entry, \ 88 &(mm)->head_node.node_list, \ 89 node_list); 90 #define drm_mm_for_each_scanned_node_reverse(entry, n, mm) \ 91 for (entry = (mm)->prev_scanned_node, \ 92 next = entry ? list_entry(entry->node_list.next, \ 93 struct drm_mm_node, node_list) : NULL; \ 94 entry != NULL; entry = next, \ 95 next = entry ? list_entry(entry->node_list.next, \ 96 struct drm_mm_node, node_list) : NULL) \ 97 /* 98 * Basic range manager support (drm_mm.c) 99 */ 100 extern struct drm_mm_node *drm_mm_get_block_generic(struct drm_mm_node *node, 101 unsigned long size, 102 unsigned alignment, 103 int atomic); 104 extern struct drm_mm_node *drm_mm_get_block_range_generic( 105 struct drm_mm_node *node, 106 unsigned long size, 107 unsigned alignment, 108 unsigned long start, 109 unsigned long end, 110 int atomic); 111 static inline struct drm_mm_node *drm_mm_get_block(struct drm_mm_node *parent, 112 unsigned long size, 113 unsigned alignment) 114 { 115 return drm_mm_get_block_generic(parent, size, alignment, 0); 116 } 117 static inline struct drm_mm_node *drm_mm_get_block_atomic(struct drm_mm_node *parent, 118 unsigned long size, 119 unsigned alignment) 120 { 121 return drm_mm_get_block_generic(parent, size, alignment, 1); 122 } 123 static inline struct drm_mm_node *drm_mm_get_block_range( 124 struct drm_mm_node *parent, 125 unsigned long size, 126 unsigned alignment, 127 unsigned long start, 128 unsigned long end) 129 { 130 return drm_mm_get_block_range_generic(parent, size, alignment, 131 start, end, 0); 132 } 133 static inline struct drm_mm_node *drm_mm_get_block_atomic_range( 134 struct drm_mm_node *parent, 135 unsigned long size, 136 unsigned alignment, 137 unsigned long start, 138 unsigned long end) 139 { 140 return drm_mm_get_block_range_generic(parent, size, alignment, 141 start, end, 1); 142 } 143 extern int drm_mm_insert_node(struct drm_mm *mm, struct drm_mm_node *node, 144 unsigned long size, unsigned alignment); 145 extern int drm_mm_insert_node_in_range(struct drm_mm *mm, 146 struct drm_mm_node *node, 147 unsigned long size, unsigned alignment, 148 unsigned long start, unsigned long end); 149 extern void drm_mm_put_block(struct drm_mm_node *cur); 150 extern void drm_mm_remove_node(struct drm_mm_node *node); 151 extern void drm_mm_replace_node(struct drm_mm_node *old, struct drm_mm_node *new); 152 extern struct drm_mm_node *drm_mm_search_free(const struct drm_mm *mm, 153 unsigned long size, 154 unsigned alignment, 155 int best_match); 156 extern struct drm_mm_node *drm_mm_search_free_in_range( 157 const struct drm_mm *mm, 158 unsigned long size, 159 unsigned alignment, 160 unsigned long start, 161 unsigned long end, 162 int best_match); 163 extern int drm_mm_init(struct drm_mm *mm, unsigned long start, 164 unsigned long size); 165 extern void drm_mm_takedown(struct drm_mm *mm); 166 extern int drm_mm_clean(struct drm_mm *mm); 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 extern void drm_mm_debug_table(struct drm_mm *mm, const char *prefix); 184 #ifdef CONFIG_DEBUG_FS 185 int drm_mm_dump_table(struct seq_file *m, struct drm_mm *mm); 186 #endif 187 188 #endif 189