hwmon: (lm90) use proper type for update_interval
[linux-2.6/btrfs-unstable.git] / include / drm / drm_mm.h
blobfc65118e5077811c69f7a5bb6af6b33419a3bb0a
1 /**************************************************************************
3 * Copyright 2006-2008 Tungsten Graphics, Inc., Cedar Park, TX. USA.
4 * All Rights Reserved.
6 * Permission is hereby granted, free of charge, to any person obtaining a
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11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
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.
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
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27 **************************************************************************/
29 * Authors:
30 * Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
33 #ifndef _DRM_MM_H_
34 #define _DRM_MM_H_
37 * Generic range manager structs
39 #include <linux/bug.h>
40 #include <linux/kernel.h>
41 #include <linux/list.h>
42 #include <linux/spinlock.h>
43 #ifdef CONFIG_DEBUG_FS
44 #include <linux/seq_file.h>
45 #endif
47 enum drm_mm_search_flags {
48 DRM_MM_SEARCH_DEFAULT = 0,
49 DRM_MM_SEARCH_BEST = 1 << 0,
50 DRM_MM_SEARCH_BELOW = 1 << 1,
53 enum drm_mm_allocator_flags {
54 DRM_MM_CREATE_DEFAULT = 0,
55 DRM_MM_CREATE_TOP = 1 << 0,
58 #define DRM_MM_BOTTOMUP DRM_MM_SEARCH_DEFAULT, DRM_MM_CREATE_DEFAULT
59 #define DRM_MM_TOPDOWN DRM_MM_SEARCH_BELOW, DRM_MM_CREATE_TOP
61 struct drm_mm_node {
62 struct list_head node_list;
63 struct list_head hole_stack;
64 unsigned hole_follows : 1;
65 unsigned scanned_block : 1;
66 unsigned scanned_prev_free : 1;
67 unsigned scanned_next_free : 1;
68 unsigned scanned_preceeds_hole : 1;
69 unsigned allocated : 1;
70 unsigned long color;
71 u64 start;
72 u64 size;
73 struct drm_mm *mm;
76 struct drm_mm {
77 /* List of all memory nodes that immediately precede a free hole. */
78 struct list_head hole_stack;
79 /* head_node.node_list is the list of all memory nodes, ordered
80 * according to the (increasing) start address of the memory node. */
81 struct drm_mm_node head_node;
82 unsigned int scan_check_range : 1;
83 unsigned scan_alignment;
84 unsigned long scan_color;
85 u64 scan_size;
86 u64 scan_hit_start;
87 u64 scan_hit_end;
88 unsigned scanned_blocks;
89 u64 scan_start;
90 u64 scan_end;
91 struct drm_mm_node *prev_scanned_node;
93 void (*color_adjust)(struct drm_mm_node *node, unsigned long color,
94 u64 *start, u64 *end);
97 /**
98 * drm_mm_node_allocated - checks whether a node is allocated
99 * @node: drm_mm_node to check
101 * Drivers should use this helpers for proper encapusulation of drm_mm
102 * internals.
104 * Returns:
105 * True if the @node is allocated.
107 static inline bool drm_mm_node_allocated(struct drm_mm_node *node)
109 return node->allocated;
113 * drm_mm_initialized - checks whether an allocator is initialized
114 * @mm: drm_mm to check
116 * Drivers should use this helpers for proper encapusulation of drm_mm
117 * internals.
119 * Returns:
120 * True if the @mm is initialized.
122 static inline bool drm_mm_initialized(struct drm_mm *mm)
124 return mm->hole_stack.next;
127 static inline u64 __drm_mm_hole_node_start(struct drm_mm_node *hole_node)
129 return hole_node->start + hole_node->size;
133 * drm_mm_hole_node_start - computes the start of the hole following @node
134 * @hole_node: drm_mm_node which implicitly tracks the following hole
136 * This is useful for driver-sepific debug dumpers. Otherwise drivers should not
137 * inspect holes themselves. Drivers must check first whether a hole indeed
138 * follows by looking at node->hole_follows.
140 * Returns:
141 * Start of the subsequent hole.
143 static inline u64 drm_mm_hole_node_start(struct drm_mm_node *hole_node)
145 BUG_ON(!hole_node->hole_follows);
146 return __drm_mm_hole_node_start(hole_node);
149 static inline u64 __drm_mm_hole_node_end(struct drm_mm_node *hole_node)
151 return list_next_entry(hole_node, node_list)->start;
155 * drm_mm_hole_node_end - computes the end of the hole following @node
156 * @hole_node: drm_mm_node which implicitly tracks the following hole
158 * This is useful for driver-sepific debug dumpers. Otherwise drivers should not
159 * inspect holes themselves. Drivers must check first whether a hole indeed
160 * follows by looking at node->hole_follows.
162 * Returns:
163 * End of the subsequent hole.
165 static inline u64 drm_mm_hole_node_end(struct drm_mm_node *hole_node)
167 return __drm_mm_hole_node_end(hole_node);
171 * drm_mm_for_each_node - iterator to walk over all allocated nodes
172 * @entry: drm_mm_node structure to assign to in each iteration step
173 * @mm: drm_mm allocator to walk
175 * This iterator walks over all nodes in the range allocator. It is implemented
176 * with list_for_each, so not save against removal of elements.
178 #define drm_mm_for_each_node(entry, mm) list_for_each_entry(entry, \
179 &(mm)->head_node.node_list, \
180 node_list)
182 #define __drm_mm_for_each_hole(entry, mm, hole_start, hole_end, backwards) \
183 for (entry = list_entry((backwards) ? (mm)->hole_stack.prev : (mm)->hole_stack.next, struct drm_mm_node, hole_stack); \
184 &entry->hole_stack != &(mm)->hole_stack ? \
185 hole_start = drm_mm_hole_node_start(entry), \
186 hole_end = drm_mm_hole_node_end(entry), \
187 1 : 0; \
188 entry = list_entry((backwards) ? entry->hole_stack.prev : entry->hole_stack.next, struct drm_mm_node, hole_stack))
191 * drm_mm_for_each_hole - iterator to walk over all holes
192 * @entry: drm_mm_node used internally to track progress
193 * @mm: drm_mm allocator to walk
194 * @hole_start: ulong variable to assign the hole start to on each iteration
195 * @hole_end: ulong variable to assign the hole end to on each iteration
197 * This iterator walks over all holes in the range allocator. It is implemented
198 * with list_for_each, so not save against removal of elements. @entry is used
199 * internally and will not reflect a real drm_mm_node for the very first hole.
200 * Hence users of this iterator may not access it.
202 * Implementation Note:
203 * We need to inline list_for_each_entry in order to be able to set hole_start
204 * and hole_end on each iteration while keeping the macro sane.
206 * The __drm_mm_for_each_hole version is similar, but with added support for
207 * going backwards.
209 #define drm_mm_for_each_hole(entry, mm, hole_start, hole_end) \
210 __drm_mm_for_each_hole(entry, mm, hole_start, hole_end, 0)
213 * Basic range manager support (drm_mm.c)
215 int drm_mm_reserve_node(struct drm_mm *mm, struct drm_mm_node *node);
217 int drm_mm_insert_node_generic(struct drm_mm *mm,
218 struct drm_mm_node *node,
219 u64 size,
220 unsigned alignment,
221 unsigned long color,
222 enum drm_mm_search_flags sflags,
223 enum drm_mm_allocator_flags aflags);
225 * drm_mm_insert_node - search for space and insert @node
226 * @mm: drm_mm to allocate from
227 * @node: preallocate node to insert
228 * @size: size of the allocation
229 * @alignment: alignment of the allocation
230 * @flags: flags to fine-tune the allocation
232 * This is a simplified version of drm_mm_insert_node_generic() with @color set
233 * to 0.
235 * The preallocated node must be cleared to 0.
237 * Returns:
238 * 0 on success, -ENOSPC if there's no suitable hole.
240 static inline int drm_mm_insert_node(struct drm_mm *mm,
241 struct drm_mm_node *node,
242 u64 size,
243 unsigned alignment,
244 enum drm_mm_search_flags flags)
246 return drm_mm_insert_node_generic(mm, node, size, alignment, 0, flags,
247 DRM_MM_CREATE_DEFAULT);
250 int drm_mm_insert_node_in_range_generic(struct drm_mm *mm,
251 struct drm_mm_node *node,
252 u64 size,
253 unsigned alignment,
254 unsigned long color,
255 u64 start,
256 u64 end,
257 enum drm_mm_search_flags sflags,
258 enum drm_mm_allocator_flags aflags);
260 * drm_mm_insert_node_in_range - ranged search for space and insert @node
261 * @mm: drm_mm to allocate from
262 * @node: preallocate node to insert
263 * @size: size of the allocation
264 * @alignment: alignment of the allocation
265 * @start: start of the allowed range for this node
266 * @end: end of the allowed range for this node
267 * @flags: flags to fine-tune the allocation
269 * This is a simplified version of drm_mm_insert_node_in_range_generic() with
270 * @color set to 0.
272 * The preallocated node must be cleared to 0.
274 * Returns:
275 * 0 on success, -ENOSPC if there's no suitable hole.
277 static inline int drm_mm_insert_node_in_range(struct drm_mm *mm,
278 struct drm_mm_node *node,
279 u64 size,
280 unsigned alignment,
281 u64 start,
282 u64 end,
283 enum drm_mm_search_flags flags)
285 return drm_mm_insert_node_in_range_generic(mm, node, size, alignment,
286 0, start, end, flags,
287 DRM_MM_CREATE_DEFAULT);
290 void drm_mm_remove_node(struct drm_mm_node *node);
291 void drm_mm_replace_node(struct drm_mm_node *old, struct drm_mm_node *new);
292 void drm_mm_init(struct drm_mm *mm,
293 u64 start,
294 u64 size);
295 void drm_mm_takedown(struct drm_mm *mm);
296 bool drm_mm_clean(struct drm_mm *mm);
298 void drm_mm_init_scan(struct drm_mm *mm,
299 u64 size,
300 unsigned alignment,
301 unsigned long color);
302 void drm_mm_init_scan_with_range(struct drm_mm *mm,
303 u64 size,
304 unsigned alignment,
305 unsigned long color,
306 u64 start,
307 u64 end);
308 bool drm_mm_scan_add_block(struct drm_mm_node *node);
309 bool drm_mm_scan_remove_block(struct drm_mm_node *node);
311 void drm_mm_debug_table(struct drm_mm *mm, const char *prefix);
312 #ifdef CONFIG_DEBUG_FS
313 int drm_mm_dump_table(struct seq_file *m, struct drm_mm *mm);
314 #endif
316 #endif