xref: /titanic_50/usr/src/uts/intel/io/drm/i915_mem.c (revision a576ab5b6e08c47732b3dedca9eaa8a8cbb85720) 
1 /* BEGIN CSTYLED */
2 
3 /* i915_mem.c -- Simple agp/fb memory manager for i915 -*- linux-c -*-
4  */
5 /*
6  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
7  * All Rights Reserved.
8  *
9  * Permission is hereby granted, free of charge, to any person obtaining a
10  * copy of this software and associated documentation files (the
11  * "Software"), to deal in the Software without restriction, including
12  * without limitation the rights to use, copy, modify, merge, publish,
13  * distribute, sub license, and/or sell copies of the Software, and to
14  * permit persons to whom the Software is furnished to do so, subject to
15  * the following conditions:
16  *
17  * The above copyright notice and this permission notice (including the
18  * next paragraph) shall be included in all copies or substantial portions
19  * of the Software.
20  *
21  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
22  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
23  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
24  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
25  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
26  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
27  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
28  *
29  */
30 
31 /*
32  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
33  * Use is subject to license terms.
34  */
35 
36 #pragma ident	"%Z%%M%	%I%	%E% SMI"
37 
38 /* This memory manager is integrated into the global/local lru
39  * mechanisms used by the clients.  Specifically, it operates by
40  * setting the 'in_use' fields of the global LRU to indicate whether
41  * this region is privately allocated to a client.
42  *
43  * This does require the client to actually respect that field.
44  *
45  * Currently no effort is made to allocate 'private' memory in any
46  * clever way - the LRU information isn't used to determine which
47  * block to allocate, and the ring is drained prior to allocations --
48  * in other words allocation is expensive.
49  */
50 
51 #include "drmP.h"
52 #include "drm.h"
53 #include "i915_drm.h"
54 #include "i915_drv.h"
55 
56 void mark_block(drm_device_t * dev, struct mem_block *p, int in_use)
57 {
58 	drm_i915_private_t *dev_priv = dev->dev_private;
59 	drm_i915_sarea_t *sarea_priv = dev_priv->sarea_priv;
60 	drm_tex_region_t *list;
61 	unsigned shift, nr;
62 	unsigned start;
63 	unsigned end;
64 	unsigned i;
65 	int age;
66 
67 	shift = dev_priv->tex_lru_log_granularity;
68 	nr = I915_NR_TEX_REGIONS;
69 
70 	start = p->start >> shift;
71 	end = (p->start + p->size - 1) >> shift;
72 
73 	age = ++sarea_priv->texAge;
74 	list = sarea_priv->texList;
75 
76 	/* Mark the regions with the new flag and update their age.  Move
77 	 * them to head of list to preserve LRU semantics.
78 	 */
79 	for (i = start; i <= end; i++) {
80 		list[i].in_use = in_use;
81 		list[i].age = age;
82 
83 		/* remove_from_list(i)
84 		 */
85 		list[(unsigned)list[i].next].prev = list[i].prev;
86 		list[(unsigned)list[i].prev].next = list[i].next;
87 
88 		/* insert_at_head(list, i)
89 		 */
90 		list[i].prev = nr;
91 		list[i].next = list[nr].next;
92 		list[(unsigned)list[nr].next].prev = i;
93 		list[nr].next = i;
94 	}
95 }
96 
97 /* Very simple allocator for agp memory, working on a static range
98  * already mapped into each client's address space.
99  */
100 
101 static struct mem_block *split_block(struct mem_block *p, int start, int size, drm_file_t *fpriv)
102 {
103 	/* Maybe cut off the start of an existing block */
104 	if (start > p->start) {
105 		struct mem_block *newblock =
106 		    drm_alloc(sizeof(*newblock), DRM_MEM_BUFLISTS);
107 		if (!newblock)
108 			goto out;
109 		newblock->start = start;
110 		newblock->size = p->size - (start - p->start);
111 		newblock->filp = NULL;
112 		newblock->next = p->next;
113 		newblock->prev = p;
114 		p->next->prev = newblock;
115 		p->next = newblock;
116 		p->size -= newblock->size;
117 		p = newblock;
118 	}
119 
120 	/* Maybe cut off the end of an existing block */
121 	if (size < p->size) {
122 		struct mem_block *newblock =
123 		    drm_alloc(sizeof(*newblock), DRM_MEM_BUFLISTS);
124 		if (!newblock)
125 			goto out;
126 		newblock->start = start + size;
127 		newblock->size = p->size - size;
128 		newblock->filp = NULL;
129 		newblock->next = p->next;
130 		newblock->prev = p;
131 		p->next->prev = newblock;
132 		p->next = newblock;
133 		p->size = size;
134 	}
135 
136       out:
137 	/* Our block is in the middle */
138 	p->filp = fpriv;
139 	return (p);
140 }
141 
142 static struct mem_block *alloc_block(struct mem_block *heap, int size,
143 				     int align2, drm_file_t *fpriv)
144 {
145 	struct mem_block *p;
146 	int mask = (1 << align2) - 1;
147 
148 	for (p = heap->next; p != heap; p = p->next) {
149 		int start = (p->start + mask) & ~mask;
150 		if (p->filp == NULL && start + size <= p->start + p->size)
151 			return split_block(p, start, size, fpriv);
152 	}
153 
154 	return NULL;
155 }
156 
157 static struct mem_block *find_block(struct mem_block *heap, int start)
158 {
159 	struct mem_block *p;
160 
161 	for (p = heap->next; p != heap; p = p->next)
162 		if (p->start == start)
163 			return (p);
164 
165 	return (NULL);
166 }
167 
168 struct mem_block *find_block_by_proc(struct mem_block *heap, drm_file_t *fpriv)
169 {
170 	struct mem_block *p;
171 
172 	for (p = heap->next; p != heap; p = p->next)
173 		if (p->filp == fpriv)
174 			return (p);
175 
176 	return (NULL);
177 }
178 
179 void free_block(struct mem_block *p)
180 {
181 	p->filp = NULL;
182 
183 	/* Assumes a single contiguous range.  Needs a special filp in
184 	 * 'heap' to stop it being subsumed.
185 	 */
186 	if (p->next->filp == NULL) {
187 		struct mem_block *q = p->next;
188 		p->size += q->size;
189 		p->next = q->next;
190 		p->next->prev = p;
191 		drm_free(q, sizeof(*q), DRM_MEM_BUFLISTS);
192 	}
193 
194 	if (p->prev->filp == NULL) {
195 		struct mem_block *q = p->prev;
196 		q->size += p->size;
197 		q->next = p->next;
198 		q->next->prev = q;
199 		drm_free(p, sizeof(*q), DRM_MEM_BUFLISTS);
200 	}
201 }
202 
203 /* Initialize.  How to check for an uninitialized heap?
204  */
205 static int init_heap(struct mem_block **heap, int start, int size)
206 {
207 	struct mem_block *blocks = drm_alloc(sizeof(*blocks), DRM_MEM_BUFLISTS);
208 
209 	if (!blocks)
210 		return (ENOMEM);
211 
212 	*heap = drm_alloc(sizeof(**heap), DRM_MEM_BUFLISTS);
213 	if (!*heap) {
214 		drm_free(blocks, sizeof(*blocks), DRM_MEM_BUFLISTS);
215 		return (ENOMEM);
216 	}
217 
218 	blocks->start = start;
219 	blocks->size = size;
220 	blocks->filp = NULL;
221 	blocks->next = blocks->prev = *heap;
222 
223 	(void) memset(*heap, 0, sizeof(**heap));
224 	(*heap)->filp = (drm_file_t *) - 1;
225 	(*heap)->next = (*heap)->prev = blocks;
226 	return (0);
227 }
228 
229 /* Free all blocks associated with the releasing file.
230  */
231 void i915_mem_release(drm_device_t * dev, drm_file_t *fpriv, struct mem_block *heap)
232 {
233 	struct mem_block *p;
234 
235 	if (!heap || !heap->next)
236 		return;
237 
238 	for (p = heap->next; p != heap; p = p->next) {
239 		if (p->filp == fpriv) {
240 			p->filp = NULL;
241 			mark_block(dev, p, 0);
242 		}
243 	}
244 
245 	/* Assumes a single contiguous range.  Needs a special filp in
246 	 * 'heap' to stop it being subsumed.
247 	 */
248 	for (p = heap->next; p != heap; p = p->next) {
249 		while (p->filp == NULL && p->next->filp == NULL) {
250 			struct mem_block *q = p->next;
251 			p->size += q->size;
252 			p->next = q->next;
253 			p->next->prev = p;
254 			drm_free(q, sizeof(*q), DRM_MEM_BUFLISTS);
255 		}
256 	}
257 }
258 
259 /* Shutdown.
260  */
261 void i915_mem_takedown(struct mem_block **heap)
262 {
263 	struct mem_block *p;
264 
265 	if (!*heap)
266 		return;
267 
268 	for (p = (*heap)->next; p != *heap;) {
269 		struct mem_block *q = p;
270 		p = p->next;
271 		drm_free(q, sizeof(*q), DRM_MEM_BUFLISTS);
272 	}
273 
274 	drm_free(*heap, sizeof(**heap), DRM_MEM_BUFLISTS);
275 	*heap = NULL;
276 }
277 
278 struct mem_block **get_heap(drm_i915_private_t * dev_priv, int region)
279 {
280 	switch (region) {
281 	case I915_MEM_REGION_AGP:
282 		return (&dev_priv->agp_heap);
283 	default:
284 		return (NULL);
285 	}
286 }
287 
288 /* IOCTL HANDLERS */
289 
290 /*ARGSUSED*/
291 int i915_mem_alloc(DRM_IOCTL_ARGS)
292 {
293 	DRM_DEVICE;
294 	drm_i915_private_t *dev_priv = dev->dev_private;
295 	drm_i915_mem_alloc_t alloc;
296 	struct mem_block *block, **heap;
297 
298 	if (!dev_priv) {
299 		DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
300 		return (EINVAL);
301 	}
302 
303 	if (ddi_model_convert_from(mode & FMODELS) == DDI_MODEL_ILP32) {
304 		drm_i915_mem_alloc32_t	alloc32;
305 
306 		DRM_COPYFROM_WITH_RETURN(&alloc32, (void *)data, sizeof (alloc32));
307 		alloc.region = alloc32.region;
308 		alloc.alignment = alloc32.alignment;
309 		alloc.size = alloc32.size;
310 		alloc.region_offset = (int *)(uintptr_t)alloc32.region_offset;
311 	} else
312 		DRM_COPYFROM_WITH_RETURN(&alloc, (void *) data, sizeof(alloc));
313 
314 	heap = get_heap(dev_priv, alloc.region);
315 	if (!heap || !*heap)
316 		return (EFAULT);
317 
318 	/* Make things easier on ourselves: all allocations at least
319 	 * 4k aligned.
320 	 */
321 	if (alloc.alignment < 12)
322 		alloc.alignment = 12;
323 
324 	block = alloc_block(*heap, alloc.size, alloc.alignment, fpriv);
325 
326 	if (!block)
327 		return (ENOMEM);
328 
329 	mark_block(dev, block, 1);
330 
331 	if (DRM_COPY_TO_USER(alloc.region_offset, &block->start, sizeof(int))) {
332 		DRM_ERROR("copy_to_user\n");
333 		return (EFAULT);
334 	}
335 
336 	return (0);
337 }
338 
339 /*ARGSUSED*/
340 int i915_mem_free(DRM_IOCTL_ARGS)
341 {
342 	DRM_DEVICE;
343 	drm_i915_private_t *dev_priv = dev->dev_private;
344 	drm_i915_mem_free_t memfree;
345 	struct mem_block *block, **heap;
346 
347 	if (!dev_priv) {
348 		DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
349 		return (EINVAL);
350 	}
351 
352 	DRM_COPYFROM_WITH_RETURN(&memfree, (void *)data, sizeof(memfree));
353 
354 	heap = get_heap(dev_priv, memfree.region);
355 	if (!heap || !*heap)
356 		return (EFAULT);
357 
358 	block = find_block(*heap, memfree.region_offset);
359 	if (!block)
360 		return (EFAULT);
361 
362 	if (block->filp != fpriv)
363 		return (EPERM);
364 
365 	mark_block(dev, block, 0);
366 	free_block(block);
367 	return (0);
368 }
369 
370 /*ARGSUSED*/
371 int i915_mem_init_heap(DRM_IOCTL_ARGS)
372 {
373 	DRM_DEVICE;
374 	drm_i915_private_t *dev_priv = dev->dev_private;
375 	drm_i915_mem_init_heap_t initheap;
376 	struct mem_block **heap;
377 
378 	if (!dev_priv) {
379 		DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
380 		return (EINVAL);
381 	}
382 
383 	DRM_COPYFROM_WITH_RETURN(&initheap, (void *)data, sizeof(initheap));
384 
385 	heap = get_heap(dev_priv, initheap.region);
386 	if (!heap)
387 		return (EFAULT);
388 
389 	if (*heap) {
390 		DRM_ERROR("heap already initialized?");
391 		return (EFAULT);
392 	}
393 
394 	return init_heap(heap, initheap.start, initheap.size);
395 }
396 
397 /*ARGSUSED*/
398 int i915_mem_destroy_heap(DRM_IOCTL_ARGS)
399 {
400 	DRM_DEVICE;
401 	drm_i915_private_t *dev_priv = dev->dev_private;
402 	drm_i915_mem_destroy_heap_t destroyheap;
403 	struct mem_block **heap;
404 
405 	if (!dev_priv) {
406 		DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
407 		return (EINVAL);
408 	}
409 
410 	DRM_COPYFROM_WITH_RETURN(&destroyheap, (void *)data, sizeof(destroyheap));
411 
412 	heap = get_heap(dev_priv, destroyheap.region);
413 	if (!heap) {
414 		DRM_ERROR("get_heap failed");
415 		return (EFAULT);
416 	}
417 
418 	if (!*heap) {
419 		DRM_ERROR("heap not initialized?");
420 		return (EFAULT);
421 	}
422 
423 	i915_mem_takedown(heap);
424 	return (0);
425 }
426