aboutsummaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/radeon/radeon_mem.c
blob: 988548efea92acdcace34b6d91c25707650e8da9 (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
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
/* radeon_mem.c -- Simple GART/fb memory manager for radeon -*- linux-c -*- */
/*
 * Copyright (C) The Weather Channel, Inc.  2002.  All Rights Reserved.
 *
 * The Weather Channel (TM) funded Tungsten Graphics to develop the
 * initial release of the Radeon 8500 driver under the XFree86 license.
 * This notice must be preserved.
 *
 * 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 (including the next
 * paragraph) 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
 * PRECISION INSIGHT AND/OR ITS SUPPLIERS 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:
 *    Keith Whitwell <keith@tungstengraphics.com>
 */

#include "drmP.h"
#include "drm.h"
#include "radeon_drm.h"
#include "radeon_drv.h"

/* Very simple allocator for GART memory, working on a static range
 * already mapped into each client's address space.
 */

static struct mem_block *split_block(struct mem_block *p, int start, int size,
				     struct drm_file *file_priv)
{
	/* Maybe cut off the start of an existing block */
	if (start > p->start) {
		struct mem_block *newblock = kmalloc(sizeof(*newblock),
						     GFP_KERNEL);
		if (!newblock)
			goto out;
		newblock->start = start;
		newblock->size = p->size - (start - p->start);
		newblock->file_priv = NULL;
		newblock->next = p->next;
		newblock->prev = p;
		p->next->prev = newblock;
		p->next = newblock;
		p->size -= newblock->size;
		p = newblock;
	}

	/* Maybe cut off the end of an existing block */
	if (size < p->size) {
		struct mem_block *newblock = kmalloc(sizeof(*newblock),
						     GFP_KERNEL);
		if (!newblock)
			goto out;
		newblock->start = start + size;
		newblock->size = p->size - size;
		newblock->file_priv = NULL;
		newblock->next = p->next;
		newblock->prev = p;
		p->next->prev = newblock;
		p->next = newblock;
		p->size = size;
	}

      out:
	/* Our block is in the middle */
	p->file_priv = file_priv;
	return p;
}

static struct mem_block *alloc_block(struct mem_block *heap, int size,
				     int align2, struct drm_file *file_priv)
{
	struct mem_block *p;
	int mask = (1 << align2) - 1;

	list_for_each(p, heap) {
		int start = (p->start + mask) & ~mask;
		if (p->file_priv == NULL && start + size <= p->start + p->size)
			return split_block(p, start, size, file_priv);
	}

	return NULL;
}

static struct mem_block *find_block(struct mem_block *heap, int start)
{
	struct mem_block *p;

	list_for_each(p, heap)
	    if (p->start == start)
		return p;

	return NULL;
}

static void free_block(struct mem_block *p)
{
	p->file_priv = NULL;

	/* Assumes a single contiguous range.  Needs a special file_priv in
	 * 'heap' to stop it being subsumed.
	 */
	if (p->next->file_priv == NULL) {
		struct mem_block *q = p->next;
		p->size += q->size;
		p->next = q->next;
		p->next->prev = p;
		kfree(q);
	}

	if (p->prev->file_priv == NULL) {
		struct mem_block *q = p->prev;
		q->size += p->size;
		q->next = p->next;
		q->next->prev = q;
		kfree(p);
	}
}

/* Initialize.  How to check for an uninitialized heap?
 */
static int init_heap(struct mem_block **heap, int start, int size)
{
	struct mem_block *blocks = kmalloc(sizeof(*blocks), GFP_KERNEL);

	if (!blocks)
		return -ENOMEM;

	*heap = kzalloc(sizeof(**heap), GFP_KERNEL);
	if (!*heap) {
		kfree(blocks);
		return -ENOMEM;
	}

	blocks->start = start;
	blocks->size = size;
	blocks->file_priv = NULL;
	blocks->next = blocks->prev = *heap;

	(*heap)->file_priv = (struct drm_file *) - 1;
	(*heap)->next = (*heap)->prev = blocks;
	return 0;
}

/* Free all blocks associated with the releasing file.
 */
void radeon_mem_release(struct drm_file *file_priv, struct mem_block *heap)
{
	struct mem_block *p;

	if (!heap || !heap->next)
		return;

	list_for_each(p, heap) {
		if (p->file_priv == file_priv)
			p->file_priv = NULL;
	}

	/* Assumes a single contiguous range.  Needs a special file_priv in
	 * 'heap' to stop it being subsumed.
	 */
	list_for_each(p, heap) {
		while (p->file_priv == NULL && p->next->file_priv == NULL) {
			struct mem_block *q = p->next;
			p->size += q->size;
			p->next = q->next;
			p->next->prev = p;
			kfree(q);
		}
	}
}

/* Shutdown.
 */
void radeon_mem_takedown(struct mem_block **heap)
{
	struct mem_block *p;

	if (!*heap)
		return;

	for (p = (*heap)->next; p != *heap;) {
		struct mem_block *q = p;
		p = p->next;
		kfree(q);
	}

	kfree(*heap);
	*heap = NULL;
}

/* IOCTL HANDLERS */

static struct mem_block **get_heap(drm_radeon_private_t * dev_priv, int region)
{
	switch (region) {
	case RADEON_MEM_REGION_GART:
		return &dev_priv->gart_heap;
	case RADEON_MEM_REGION_FB:
		return &dev_priv->fb_heap;
	default:
		return NULL;
	}
}

int radeon_mem_alloc(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
	drm_radeon_private_t *dev_priv = dev->dev_private;
	drm_radeon_mem_alloc_t *alloc = data;
	struct mem_block *block, **heap;

	if (!dev_priv) {
		DRM_ERROR("called with no initialization\n");
		return -EINVAL;
	}

	heap = get_heap(dev_priv, alloc->region);
	if (!heap || !*heap)
		return -EFAULT;

	/* Make things easier on ourselves: all allocations at least
	 * 4k aligned.
	 */
	if (alloc->alignment < 12)
		alloc->alignment = 12;

	block = alloc_block(*heap, alloc->size, alloc->alignment, file_priv);

	if (!block)
		return -ENOMEM;

	if (DRM_COPY_TO_USER(alloc->region_offset, &block->start,
			     sizeof(int))) {
		DRM_ERROR("copy_to_user\n");
		return -EFAULT;
	}

	return 0;
}

int radeon_mem_free(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
	drm_radeon_private_t *dev_priv = dev->dev_private;
	drm_radeon_mem_free_t *memfree = data;
	struct mem_block *block, **heap;

	if (!dev_priv) {
		DRM_ERROR("called with no initialization\n");
		return -EINVAL;
	}

	heap = get_heap(dev_priv, memfree->region);
	if (!heap || !*heap)
		return -EFAULT;

	block = find_block(*heap, memfree->region_offset);
	if (!block)
		return -EFAULT;

	if (block->file_priv != file_priv)
		return -EPERM;

	free_block(block);
	return 0;
}

int radeon_mem_init_heap(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
	drm_radeon_private_t *dev_priv = dev->dev_private;
	drm_radeon_mem_init_heap_t *initheap = data;
	struct mem_block **heap;

	if (!dev_priv) {
		DRM_ERROR("called with no initialization\n");
		return -EINVAL;
	}

	heap = get_heap(dev_priv, initheap->region);
	if (!heap)
		return -EFAULT;

	if (*heap) {
		DRM_ERROR("heap already initialized?");
		return -EFAULT;
	}

	return init_heap(heap, initheap->start, initheap->size);
}