1 /* radeon_mem.c -- Simple GART/fb memory manager for radeon -*- linux-c -*- */
2 /*-
3 * Copyright (C) The Weather Channel, Inc. 2002. All Rights Reserved.
4 *
5 * The Weather Channel (TM) funded Tungsten Graphics to develop the
6 * initial release of the Radeon 8500 driver under the XFree86 license.
7 * This notice must be preserved.
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice (including the next
17 * paragraph) shall be included in all copies or substantial portions of the
18 * Software.
19 *
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
23 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
24 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
25 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
26 * DEALINGS IN THE SOFTWARE.
27 *
28 * Authors:
29 * Keith Whitwell <keith@tungstengraphics.com>
30 */
31
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD: releng/9.0/sys/dev/drm/radeon_mem.c 182080 2008-08-23 20:59:12Z rnoland $");
34
35 #include "dev/drm/drmP.h"
36 #include "dev/drm/drm.h"
37 #include "dev/drm/radeon_drm.h"
38 #include "dev/drm/radeon_drv.h"
39
40 /* Very simple allocator for GART memory, working on a static range
41 * already mapped into each client's address space.
42 */
43
44 static struct mem_block *split_block(struct mem_block *p, int start, int size,
45 struct drm_file *file_priv)
46 {
47 /* Maybe cut off the start of an existing block */
48 if (start > p->start) {
49 struct mem_block *newblock =
50 drm_alloc(sizeof(*newblock), DRM_MEM_BUFS);
51 if (!newblock)
52 goto out;
53 newblock->start = start;
54 newblock->size = p->size - (start - p->start);
55 newblock->file_priv = NULL;
56 newblock->next = p->next;
57 newblock->prev = p;
58 p->next->prev = newblock;
59 p->next = newblock;
60 p->size -= newblock->size;
61 p = newblock;
62 }
63
64 /* Maybe cut off the end of an existing block */
65 if (size < p->size) {
66 struct mem_block *newblock =
67 drm_alloc(sizeof(*newblock), DRM_MEM_BUFS);
68 if (!newblock)
69 goto out;
70 newblock->start = start + size;
71 newblock->size = p->size - size;
72 newblock->file_priv = NULL;
73 newblock->next = p->next;
74 newblock->prev = p;
75 p->next->prev = newblock;
76 p->next = newblock;
77 p->size = size;
78 }
79
80 out:
81 /* Our block is in the middle */
82 p->file_priv = file_priv;
83 return p;
84 }
85
86 static struct mem_block *alloc_block(struct mem_block *heap, int size,
87 int align2, struct drm_file *file_priv)
88 {
89 struct mem_block *p;
90 int mask = (1 << align2) - 1;
91
92 list_for_each(p, heap) {
93 int start = (p->start + mask) & ~mask;
94 if (p->file_priv == NULL && start + size <= p->start + p->size)
95 return split_block(p, start, size, file_priv);
96 }
97
98 return NULL;
99 }
100
101 static struct mem_block *find_block(struct mem_block *heap, int start)
102 {
103 struct mem_block *p;
104
105 list_for_each(p, heap)
106 if (p->start == start)
107 return p;
108
109 return NULL;
110 }
111
112 static void free_block(struct mem_block *p)
113 {
114 p->file_priv = NULL;
115
116 /* Assumes a single contiguous range. Needs a special file_priv in
117 * 'heap' to stop it being subsumed.
118 */
119 if (p->next->file_priv == NULL) {
120 struct mem_block *q = p->next;
121 p->size += q->size;
122 p->next = q->next;
123 p->next->prev = p;
124 drm_free(q, sizeof(*q), DRM_MEM_BUFS);
125 }
126
127 if (p->prev->file_priv == NULL) {
128 struct mem_block *q = p->prev;
129 q->size += p->size;
130 q->next = p->next;
131 q->next->prev = q;
132 drm_free(p, sizeof(*q), DRM_MEM_BUFS);
133 }
134 }
135
136 /* Initialize. How to check for an uninitialized heap?
137 */
138 static int init_heap(struct mem_block **heap, int start, int size)
139 {
140 struct mem_block *blocks = drm_alloc(sizeof(*blocks), DRM_MEM_BUFS);
141
142 if (!blocks)
143 return -ENOMEM;
144
145 *heap = drm_alloc(sizeof(**heap), DRM_MEM_BUFS);
146 if (!*heap) {
147 drm_free(blocks, sizeof(*blocks), DRM_MEM_BUFS);
148 return -ENOMEM;
149 }
150
151 blocks->start = start;
152 blocks->size = size;
153 blocks->file_priv = NULL;
154 blocks->next = blocks->prev = *heap;
155
156 memset(*heap, 0, sizeof(**heap));
157 (*heap)->file_priv = (struct drm_file *) - 1;
158 (*heap)->next = (*heap)->prev = blocks;
159 return 0;
160 }
161
162 /* Free all blocks associated with the releasing file.
163 */
164 void radeon_mem_release(struct drm_file *file_priv, struct mem_block *heap)
165 {
166 struct mem_block *p;
167
168 if (!heap || !heap->next)
169 return;
170
171 list_for_each(p, heap) {
172 if (p->file_priv == file_priv)
173 p->file_priv = NULL;
174 }
175
176 /* Assumes a single contiguous range. Needs a special file_priv in
177 * 'heap' to stop it being subsumed.
178 */
179 list_for_each(p, heap) {
180 while (p->file_priv == NULL && p->next->file_priv == NULL) {
181 struct mem_block *q = p->next;
182 p->size += q->size;
183 p->next = q->next;
184 p->next->prev = p;
185 drm_free(q, sizeof(*q), DRM_MEM_DRIVER);
186 }
187 }
188 }
189
190 /* Shutdown.
191 */
192 void radeon_mem_takedown(struct mem_block **heap)
193 {
194 struct mem_block *p;
195
196 if (!*heap)
197 return;
198
199 for (p = (*heap)->next; p != *heap;) {
200 struct mem_block *q = p;
201 p = p->next;
202 drm_free(q, sizeof(*q), DRM_MEM_DRIVER);
203 }
204
205 drm_free(*heap, sizeof(**heap), DRM_MEM_DRIVER);
206 *heap = NULL;
207 }
208
209 /* IOCTL HANDLERS */
210
211 static struct mem_block **get_heap(drm_radeon_private_t * dev_priv, int region)
212 {
213 switch (region) {
214 case RADEON_MEM_REGION_GART:
215 return &dev_priv->gart_heap;
216 case RADEON_MEM_REGION_FB:
217 return &dev_priv->fb_heap;
218 default:
219 return NULL;
220 }
221 }
222
223 int radeon_mem_alloc(struct drm_device *dev, void *data, struct drm_file *file_priv)
224 {
225 drm_radeon_private_t *dev_priv = dev->dev_private;
226 drm_radeon_mem_alloc_t *alloc = data;
227 struct mem_block *block, **heap;
228
229 if (!dev_priv) {
230 DRM_ERROR("called with no initialization\n");
231 return -EINVAL;
232 }
233
234 heap = get_heap(dev_priv, alloc->region);
235 if (!heap || !*heap)
236 return -EFAULT;
237
238 /* Make things easier on ourselves: all allocations at least
239 * 4k aligned.
240 */
241 if (alloc->alignment < 12)
242 alloc->alignment = 12;
243
244 block = alloc_block(*heap, alloc->size, alloc->alignment, file_priv);
245
246 if (!block)
247 return -ENOMEM;
248
249 if (DRM_COPY_TO_USER(alloc->region_offset, &block->start,
250 sizeof(int))) {
251 DRM_ERROR("copy_to_user\n");
252 return -EFAULT;
253 }
254
255 return 0;
256 }
257
258 int radeon_mem_free(struct drm_device *dev, void *data, struct drm_file *file_priv)
259 {
260 drm_radeon_private_t *dev_priv = dev->dev_private;
261 drm_radeon_mem_free_t *memfree = data;
262 struct mem_block *block, **heap;
263
264 if (!dev_priv) {
265 DRM_ERROR("called with no initialization\n");
266 return -EINVAL;
267 }
268
269 heap = get_heap(dev_priv, memfree->region);
270 if (!heap || !*heap)
271 return -EFAULT;
272
273 block = find_block(*heap, memfree->region_offset);
274 if (!block)
275 return -EFAULT;
276
277 if (block->file_priv != file_priv)
278 return -EPERM;
279
280 free_block(block);
281 return 0;
282 }
283
284 int radeon_mem_init_heap(struct drm_device *dev, void *data, struct drm_file *file_priv)
285 {
286 drm_radeon_private_t *dev_priv = dev->dev_private;
287 drm_radeon_mem_init_heap_t *initheap = data;
288 struct mem_block **heap;
289
290 if (!dev_priv) {
291 DRM_ERROR("called with no initialization\n");
292 return -EINVAL;
293 }
294
295 heap = get_heap(dev_priv, initheap->region);
296 if (!heap)
297 return -EFAULT;
298
299 if (*heap) {
300 DRM_ERROR("heap already initialized?");
301 return -EFAULT;
302 }
303
304 return init_heap(heap, initheap->start, initheap->size);
305 }
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