aboutsummaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/nouveau/nouveau_mm.c
blob: 1640dec3b82322370abca80eca493e927c8b942e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
/*
 * Copyright 2010 Red Hat Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: Ben Skeggs
 */

#include "drmP.h"
#include "nouveau_drv.h"
#include "nouveau_mm.h"

static inline void
region_put(struct nouveau_mm *rmm, struct nouveau_mm_node *a)
{
	list_del(&a->nl_entry);
	list_del(&a->fl_entry);
	kfree(a);
}

static struct nouveau_mm_node *
region_split(struct nouveau_mm *rmm, struct nouveau_mm_node *a, u32 size)
{
	struct nouveau_mm_node *b;

	if (a->length == size)
		return a;

	b = kmalloc(sizeof(*b), GFP_KERNEL);
	if (unlikely(b == NULL))
		return NULL;

	b->offset = a->offset;
	b->length = size;
	b->type   = a->type;
	a->offset += size;
	a->length -= size;
	list_add_tail(&b->nl_entry, &a->nl_entry);
	if (b->type == 0)
		list_add_tail(&b->fl_entry, &a->fl_entry);
	return b;
}

#define node(root, dir) ((root)->nl_entry.dir == &rmm->nodes) ? NULL : \
	list_entry((root)->nl_entry.dir, struct nouveau_mm_node, nl_entry)

void
nouveau_mm_put(struct nouveau_mm *rmm, struct nouveau_mm_node *this)
{
	struct nouveau_mm_node *prev = node(this, prev);
	struct nouveau_mm_node *next = node(this, next);

	list_add(&this->fl_entry, &rmm->free);
	this->type = 0;

	if (prev && prev->type == 0) {
		prev->length += this->length;
		region_put(rmm, this);
		this = prev;
	}

	if (next && next->type == 0) {
		next->offset  = this->offset;
		next->length += this->length;
		region_put(rmm, this);
	}
}

int
nouveau_mm_get(struct nouveau_mm *rmm, int type, u32 size, u32 size_nc,
	       u32 align, struct nouveau_mm_node **pnode)
{
	struct nouveau_mm_node *prev, *this, *next;
	u32 min = size_nc ? size_nc : size;
	u32 align_mask = align - 1;
	u32 splitoff;
	u32 s, e;

	list_for_each_entry(this, &rmm->free, fl_entry) {
		e = this->offset + this->length;
		s = this->offset;

		prev = node(this, prev);
		if (prev && prev->type != type)
			s = roundup(s, rmm->block_size);

		next = node(this, next);
		if (next && next->type != type)
			e = rounddown(e, rmm->block_size);

		s  = (s + align_mask) & ~align_mask;
		e &= ~align_mask;
		if (s > e || e - s < min)
			continue;

		splitoff = s - this->offset;
		if (splitoff && !region_split(rmm, this, splitoff))
			return -ENOMEM;

		this = region_split(rmm, this, min(size, e - s));
		if (!this)
			return -ENOMEM;

		this->type = type;
		list_del(&this->fl_entry);
		*pnode = this;
		return 0;
	}

	return -ENOSPC;
}

int
nouveau_mm_init(struct nouveau_mm **prmm, u32 offset, u32 length, u32 block)
{
	struct nouveau_mm *rmm;
	struct nouveau_mm_node *heap;

	heap = kzalloc(sizeof(*heap), GFP_KERNEL);
	if (!heap)
		return -ENOMEM;
	heap->offset = roundup(offset, block);
	heap->length = rounddown(offset + length, block) - heap->offset;

	rmm = kzalloc(sizeof(*rmm), GFP_KERNEL);
	if (!rmm) {
		kfree(heap);
		return -ENOMEM;
	}
	rmm->block_size = block;
	mutex_init(&rmm->mutex);
	INIT_LIST_HEAD(&rmm->nodes);
	INIT_LIST_HEAD(&rmm->free);
	list_add(&heap->nl_entry, &rmm->nodes);
	list_add(&heap->fl_entry, &rmm->free);

	*prmm = rmm;
	return 0;
}

int
nouveau_mm_fini(struct nouveau_mm **prmm)
{
	struct nouveau_mm *rmm = *prmm;
	struct nouveau_mm_node *node, *heap =
		list_first_entry(&rmm->nodes, struct nouveau_mm_node, nl_entry);

	if (!list_is_singular(&rmm->nodes)) {
		printk(KERN_ERR "nouveau_mm not empty at destroy time!\n");
		list_for_each_entry(node, &rmm->nodes, nl_entry) {
			printk(KERN_ERR "0x%02x: 0x%08x 0x%08x\n",
			       node->type, node->offset, node->length);
		}
		WARN_ON(1);
		return -EBUSY;
	}

	kfree(heap);
	kfree(rmm);
	*prmm = NULL;
	return 0;
}