2 * Copyright 2012 Red Hat Inc.
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
28 #define node(root, dir) ((root)->nl_entry.dir == &mm->nodes) ? NULL : \
29 list_entry((root)->nl_entry.dir, struct nouveau_mm_node, nl_entry)
32 nouveau_mm_free(struct nouveau_mm *mm, struct nouveau_mm_node **pthis)
34 struct nouveau_mm_node *this = *pthis;
37 struct nouveau_mm_node *prev = node(this, prev);
38 struct nouveau_mm_node *next = node(this, next);
40 if (prev && prev->type == 0) {
41 prev->length += this->length;
42 list_del(&this->nl_entry);
43 kfree(this); this = prev;
46 if (next && next->type == 0) {
47 next->offset = this->offset;
48 next->length += this->length;
50 list_del(&this->fl_entry);
51 list_del(&this->nl_entry);
52 kfree(this); this = NULL;
55 if (this && this->type != 0) {
56 list_for_each_entry(prev, &mm->free, fl_entry) {
57 if (this->offset < prev->offset)
61 list_add_tail(&this->fl_entry, &prev->fl_entry);
69 static struct nouveau_mm_node *
70 region_head(struct nouveau_mm *mm, struct nouveau_mm_node *a, u32 size)
72 struct nouveau_mm_node *b;
74 if (a->length == size)
77 b = kmalloc(sizeof(*b), GFP_KERNEL);
78 if (unlikely(b == NULL))
81 b->offset = a->offset;
86 list_add_tail(&b->nl_entry, &a->nl_entry);
88 list_add_tail(&b->fl_entry, &a->fl_entry);
93 nouveau_mm_head(struct nouveau_mm *mm, u8 type, u32 size_max, u32 size_min,
94 u32 align, struct nouveau_mm_node **pnode)
96 struct nouveau_mm_node *prev, *this, *next;
101 list_for_each_entry(this, &mm->free, fl_entry) {
102 e = this->offset + this->length;
105 prev = node(this, prev);
106 if (prev && prev->type != type)
107 s = roundup(s, mm->block_size);
109 next = node(this, next);
110 if (next && next->type != type)
111 e = rounddown(e, mm->block_size);
113 s = (s + mask) & ~mask;
115 if (s > e || e - s < size_min)
118 splitoff = s - this->offset;
119 if (splitoff && !region_head(mm, this, splitoff))
122 this = region_head(mm, this, min(size_max, e - s));
127 list_del(&this->fl_entry);
135 static struct nouveau_mm_node *
136 region_tail(struct nouveau_mm *mm, struct nouveau_mm_node *a, u32 size)
138 struct nouveau_mm_node *b;
140 if (a->length == size)
143 b = kmalloc(sizeof(*b), GFP_KERNEL);
144 if (unlikely(b == NULL))
148 b->offset = a->offset + a->length;
152 list_add(&b->nl_entry, &a->nl_entry);
154 list_add(&b->fl_entry, &a->fl_entry);
159 nouveau_mm_tail(struct nouveau_mm *mm, u8 type, u32 size_max, u32 size_min,
160 u32 align, struct nouveau_mm_node **pnode)
162 struct nouveau_mm_node *prev, *this, *next;
163 u32 mask = align - 1;
165 list_for_each_entry_reverse(this, &mm->free, fl_entry) {
166 u32 e = this->offset + this->length;
167 u32 s = this->offset;
170 prev = node(this, prev);
171 if (prev && prev->type != type)
172 s = roundup(s, mm->block_size);
174 next = node(this, next);
175 if (next && next->type != type) {
176 e = rounddown(e, mm->block_size);
177 c = next->offset - e;
180 s = (s + mask) & ~mask;
182 if (s > e || a < size_min)
185 a = min(a, size_max);
189 if (c && !region_tail(mm, this, c))
192 this = region_tail(mm, this, a);
197 list_del(&this->fl_entry);
206 nouveau_mm_init(struct nouveau_mm *mm, u32 offset, u32 length, u32 block)
208 struct nouveau_mm_node *node;
211 mutex_init(&mm->mutex);
212 INIT_LIST_HEAD(&mm->nodes);
213 INIT_LIST_HEAD(&mm->free);
214 mm->block_size = block;
218 node = kzalloc(sizeof(*node), GFP_KERNEL);
223 node->offset = roundup(offset, mm->block_size);
224 node->length = rounddown(offset + length, mm->block_size);
225 node->length -= node->offset;
228 list_add_tail(&node->nl_entry, &mm->nodes);
229 list_add_tail(&node->fl_entry, &mm->free);
235 nouveau_mm_fini(struct nouveau_mm *mm)
237 struct nouveau_mm_node *node, *heap =
238 list_first_entry(&mm->nodes, struct nouveau_mm_node, nl_entry);
241 list_for_each_entry(node, &mm->nodes, nl_entry) {
242 if (WARN_ON(nodes++ == mm->heap_nodes))