1 /* i915_mem.c -- Simple agp/fb memory manager for i915 -*- linux-c -*-
2 */
3 /*
4 * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
5 * All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the
9 * "Software"), to deal in the Software without restriction, including
10 * without limitation the rights to use, copy, modify, merge, publish,
11 * distribute, sub license, and/or sell copies of the Software, and to
12 * permit persons to whom the Software is furnished to do so, subject to
13 * the following conditions:
14 *
15 * The above copyright notice and this permission notice (including the
16 * next paragraph) shall be included in all copies or substantial portions
17 * of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
21 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
22 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
23 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
24 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
25 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 *
27 */
28
29 #include "drmP.h"
30 #include "drm.h"
31 #include "i915_drm.h"
32 #include "i915_drv.h"
33
34 /* This memory manager is integrated into the global/local lru
35 * mechanisms used by the clients. Specifically, it operates by
36 * setting the 'in_use' fields of the global LRU to indicate whether
37 * this region is privately allocated to a client.
38 *
39 * This does require the client to actually respect that field.
40 *
41 * Currently no effort is made to allocate 'private' memory in any
42 * clever way - the LRU information isn't used to determine which
43 * block to allocate, and the ring is drained prior to allocations --
44 * in other words allocation is expensive.
45 */
46 static void mark_block(struct drm_device * dev, struct mem_block *p, int in_use)
47 {
48 drm_i915_private_t *dev_priv = dev->dev_private;
49 drm_i915_sarea_t *sarea_priv = dev_priv->sarea_priv;
50 struct drm_tex_region *list;
51 unsigned shift, nr;
52 unsigned start;
53 unsigned end;
54 unsigned i;
55 int age;
56
57 shift = dev_priv->tex_lru_log_granularity;
58 nr = I915_NR_TEX_REGIONS;
59
60 start = p->start >> shift;
61 end = (p->start + p->size - 1) >> shift;
62
63 age = ++sarea_priv->texAge;
64 list = sarea_priv->texList;
65
66 /* Mark the regions with the new flag and update their age. Move
67 * them to head of list to preserve LRU semantics.
68 */
69 for (i = start; i <= end; i++) {
70 list[i].in_use = in_use;
71 list[i].age = age;
72
73 /* remove_from_list(i)
74 */
75 list[(unsigned)list[i].next].prev = list[i].prev;
76 list[(unsigned)list[i].prev].next = list[i].next;
77
78 /* insert_at_head(list, i)
79 */
80 list[i].prev = nr;
81 list[i].next = list[nr].next;
82 list[(unsigned)list[nr].next].prev = i;
83 list[nr].next = i;
84 }
85 }
86
87 /* Very simple allocator for agp memory, working on a static range
88 * already mapped into each client's address space.
89 */
90
91 static struct mem_block *split_block(struct mem_block *p, int start, int size,
92 struct drm_file *file_priv)
93 {
94 /* Maybe cut off the start of an existing block */
95 if (start > p->start) {
96 struct mem_block *newblock =
97 drm_alloc(sizeof(*newblock), DRM_MEM_BUFLISTS);
98 if (!newblock)
99 goto out;
100 newblock->start = start;
101 newblock->size = p->size - (start - p->start);
102 newblock->file_priv = NULL;
103 newblock->next = p->next;
104 newblock->prev = p;
105 p->next->prev = newblock;
106 p->next = newblock;
107 p->size -= newblock->size;
108 p = newblock;
109 }
110
111 /* Maybe cut off the end of an existing block */
112 if (size < p->size) {
113 struct mem_block *newblock =
114 drm_alloc(sizeof(*newblock), DRM_MEM_BUFLISTS);
115 if (!newblock)
116 goto out;
117 newblock->start = start + size;
118 newblock->size = p->size - size;
119 newblock->file_priv = NULL;
120 newblock->next = p->next;
121 newblock->prev = p;
122 p->next->prev = newblock;
123 p->next = newblock;
124 p->size = size;
125 }
126
127 out:
128 /* Our block is in the middle */
129 p->file_priv = file_priv;
130 return p;
131 }
132
133 static struct mem_block *alloc_block(struct mem_block *heap, int size,
134 int align2, struct drm_file *file_priv)
135 {
136 struct mem_block *p;
137 int mask = (1 << align2) - 1;
138
139 for (p = heap->next; p != heap; p = p->next) {
140 int start = (p->start + mask) & ~mask;
141 if (p->file_priv == NULL && start + size <= p->start + p->size)
142 return split_block(p, start, size, file_priv);
143 }
144
145 return NULL;
146 }
147
148 static struct mem_block *find_block(struct mem_block *heap, int start)
149 {
150 struct mem_block *p;
151
152 for (p = heap->next; p != heap; p = p->next)
153 if (p->start == start)
154 return p;
155
156 return NULL;
157 }
158
159 static void free_block(struct mem_block *p)
160 {
161 p->file_priv = NULL;
162
163 /* Assumes a single contiguous range. Needs a special file_priv in
164 * 'heap' to stop it being subsumed.
165 */
166 if (p->next->file_priv == NULL) {
167 struct mem_block *q = p->next;
168 p->size += q->size;
169 p->next = q->next;
170 p->next->prev = p;
171 drm_free(q, sizeof(*q), DRM_MEM_BUFLISTS);
172 }
173
174 if (p->prev->file_priv == NULL) {
175 struct mem_block *q = p->prev;
176 q->size += p->size;
177 q->next = p->next;
178 q->next->prev = q;
179 drm_free(p, sizeof(*q), DRM_MEM_BUFLISTS);
180 }
181 }
182
183 /* Initialize. How to check for an uninitialized heap?
184 */
185 static int init_heap(struct mem_block **heap, int start, int size)
186 {
187 struct mem_block *blocks = drm_alloc(sizeof(*blocks), DRM_MEM_BUFLISTS);
188
189 if (!blocks)
190 return -ENOMEM;
191
192 *heap = drm_alloc(sizeof(**heap), DRM_MEM_BUFLISTS);
193 if (!*heap) {
194 drm_free(blocks, sizeof(*blocks), DRM_MEM_BUFLISTS);
195 return -ENOMEM;
196 }
197
198 blocks->start = start;
199 blocks->size = size;
200 blocks->file_priv = NULL;
201 blocks->next = blocks->prev = *heap;
202
203 memset(*heap, 0, sizeof(**heap));
204 (*heap)->file_priv = (struct drm_file *) - 1;
205 (*heap)->next = (*heap)->prev = blocks;
206 return 0;
207 }
208
209 /* Free all blocks associated with the releasing file.
210 */
211 void i915_mem_release(struct drm_device * dev, struct drm_file *file_priv,
212 struct mem_block *heap)
213 {
214 struct mem_block *p;
215
216 if (!heap || !heap->next)
217 return;
218
219 for (p = heap->next; p != heap; p = p->next) {
220 if (p->file_priv == file_priv) {
221 p->file_priv = NULL;
222 mark_block(dev, p, 0);
223 }
224 }
225
226 /* Assumes a single contiguous range. Needs a special file_priv in
227 * 'heap' to stop it being subsumed.
228 */
229 for (p = heap->next; p != heap; p = p->next) {
230 while (p->file_priv == NULL && p->next->file_priv == NULL) {
231 struct mem_block *q = p->next;
232 p->size += q->size;
233 p->next = q->next;
234 p->next->prev = p;
235 drm_free(q, sizeof(*q), DRM_MEM_BUFLISTS);
236 }
237 }
238 }
239
240 /* Shutdown.
241 */
242 void i915_mem_takedown(struct mem_block **heap)
243 {
244 struct mem_block *p;
245
246 if (!*heap)
247 return;
248
249 for (p = (*heap)->next; p != *heap;) {
250 struct mem_block *q = p;
251 p = p->next;
252 drm_free(q, sizeof(*q), DRM_MEM_BUFLISTS);
253 }
254
255 drm_free(*heap, sizeof(**heap), DRM_MEM_BUFLISTS);
256 *heap = NULL;
257 }
258
259 static struct mem_block **get_heap(drm_i915_private_t * dev_priv, int region)
260 {
261 switch (region) {
262 case I915_MEM_REGION_AGP:
263 return &dev_priv->agp_heap;
264 default:
265 return NULL;
266 }
267 }
268
269 /* IOCTL HANDLERS */
270
271 int i915_mem_alloc(struct drm_device *dev, void *data,
272 struct drm_file *file_priv)
273 {
274 drm_i915_private_t *dev_priv = dev->dev_private;
275 drm_i915_mem_alloc_t *alloc = data;
276 struct mem_block *block, **heap;
277
278 if (!dev_priv) {
279 DRM_ERROR("called with no initialization\n");
280 return -EINVAL;
281 }
282
283 heap = get_heap(dev_priv, alloc->region);
284 if (!heap || !*heap)
285 return -EFAULT;
286
287 /* Make things easier on ourselves: all allocations at least
288 * 4k aligned.
289 */
290 if (alloc->alignment < 12)
291 alloc->alignment = 12;
292
293 block = alloc_block(*heap, alloc->size, alloc->alignment, file_priv);
294
295 if (!block)
296 return -ENOMEM;
297
298 mark_block(dev, block, 1);
299
300 if (DRM_COPY_TO_USER(alloc->region_offset, &block->start,
301 sizeof(int))) {
302 DRM_ERROR("copy_to_user\n");
303 return -EFAULT;
304 }
305
306 return 0;
307 }
308
309 int i915_mem_free(struct drm_device *dev, void *data,
310 struct drm_file *file_priv)
311 {
312 drm_i915_private_t *dev_priv = dev->dev_private;
313 drm_i915_mem_free_t *memfree = data;
314 struct mem_block *block, **heap;
315
316 if (!dev_priv) {
317 DRM_ERROR("called with no initialization\n");
318 return -EINVAL;
319 }
320
321 heap = get_heap(dev_priv, memfree->region);
322 if (!heap || !*heap)
323 return -EFAULT;
324
325 block = find_block(*heap, memfree->region_offset);
326 if (!block)
327 return -EFAULT;
328
329 if (block->file_priv != file_priv)
330 return -EPERM;
331
332 mark_block(dev, block, 0);
333 free_block(block);
334 return 0;
335 }
336
337 int i915_mem_init_heap(struct drm_device *dev, void *data,
338 struct drm_file *file_priv)
339 {
340 drm_i915_private_t *dev_priv = dev->dev_private;
341 drm_i915_mem_init_heap_t *initheap = data;
342 struct mem_block **heap;
343
344 if (!dev_priv) {
345 DRM_ERROR("called with no initialization\n");
346 return -EINVAL;
347 }
348
349 heap = get_heap(dev_priv, initheap->region);
350 if (!heap)
351 return -EFAULT;
352
353 if (*heap) {
354 DRM_ERROR("heap already initialized?");
355 return -EFAULT;
356 }
357
358 return init_heap(heap, initheap->start, initheap->size);
359 }
360
361 int i915_mem_destroy_heap( struct drm_device *dev, void *data,
362 struct drm_file *file_priv )
363 {
364 drm_i915_private_t *dev_priv = dev->dev_private;
365 drm_i915_mem_destroy_heap_t *destroyheap = data;
366 struct mem_block **heap;
367
368 if ( !dev_priv ) {
369 DRM_ERROR( "called with no initialization\n" );
370 return -EINVAL;
371 }
372
373 heap = get_heap( dev_priv, destroyheap->region );
374 if (!heap) {
375 DRM_ERROR("get_heap failed");
376 return -EFAULT;
377 }
378
379 if (!*heap) {
380 DRM_ERROR("heap not initialized?");
381 return -EFAULT;
382 }
383
384 i915_mem_takedown( heap );
385 return 0;
386 }
387
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