1 /* radeon_mem.c -- Simple GART/fb memory manager for radeon -*- linux-c -*- */
3 * Copyright (C) The Weather Channel, Inc. 2002. All Rights Reserved.
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.
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:
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
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.
29 * Keith Whitwell <keith@tungstengraphics.com>
34 #include "radeon_drm.h"
35 #include "radeon_drv.h"
37 /* Very simple allocator for GART memory, working on a static range
38 * already mapped into each client's address space.
41 static struct mem_block *split_block(struct mem_block *p, int start, int size,
42 struct drm_file *file_priv)
44 /* Maybe cut off the start of an existing block */
45 if (start > p->start) {
46 struct mem_block *newblock = kmalloc(sizeof(*newblock),
50 newblock->start = start;
51 newblock->size = p->size - (start - p->start);
52 newblock->file_priv = NULL;
53 newblock->next = p->next;
55 p->next->prev = newblock;
57 p->size -= newblock->size;
61 /* Maybe cut off the end of an existing block */
63 struct mem_block *newblock = kmalloc(sizeof(*newblock),
67 newblock->start = start + size;
68 newblock->size = p->size - size;
69 newblock->file_priv = NULL;
70 newblock->next = p->next;
72 p->next->prev = newblock;
78 /* Our block is in the middle */
79 p->file_priv = file_priv;
83 static struct mem_block *alloc_block(struct mem_block *heap, int size,
84 int align2, struct drm_file *file_priv)
87 int mask = (1 << align2) - 1;
89 list_for_each(p, heap) {
90 int start = (p->start + mask) & ~mask;
91 if (p->file_priv == NULL && start + size <= p->start + p->size)
92 return split_block(p, start, size, file_priv);
98 static struct mem_block *find_block(struct mem_block *heap, int start)
102 list_for_each(p, heap)
103 if (p->start == start)
109 static void free_block(struct mem_block *p)
113 /* Assumes a single contiguous range. Needs a special file_priv in
114 * 'heap' to stop it being subsumed.
116 if (p->next->file_priv == NULL) {
117 struct mem_block *q = p->next;
124 if (p->prev->file_priv == NULL) {
125 struct mem_block *q = p->prev;
133 /* Initialize. How to check for an uninitialized heap?
135 static int init_heap(struct mem_block **heap, int start, int size)
137 struct mem_block *blocks = kmalloc(sizeof(*blocks), GFP_KERNEL);
142 *heap = kmalloc(sizeof(**heap), GFP_KERNEL);
148 blocks->start = start;
150 blocks->file_priv = NULL;
151 blocks->next = blocks->prev = *heap;
153 memset(*heap, 0, sizeof(**heap));
154 (*heap)->file_priv = (struct drm_file *) - 1;
155 (*heap)->next = (*heap)->prev = blocks;
159 /* Free all blocks associated with the releasing file.
161 void radeon_mem_release(struct drm_file *file_priv, struct mem_block *heap)
165 if (!heap || !heap->next)
168 list_for_each(p, heap) {
169 if (p->file_priv == file_priv)
173 /* Assumes a single contiguous range. Needs a special file_priv in
174 * 'heap' to stop it being subsumed.
176 list_for_each(p, heap) {
177 while (p->file_priv == NULL && p->next->file_priv == NULL) {
178 struct mem_block *q = p->next;
189 void radeon_mem_takedown(struct mem_block **heap)
196 for (p = (*heap)->next; p != *heap;) {
197 struct mem_block *q = p;
208 static struct mem_block **get_heap(drm_radeon_private_t * dev_priv, int region)
211 case RADEON_MEM_REGION_GART:
212 return &dev_priv->gart_heap;
213 case RADEON_MEM_REGION_FB:
214 return &dev_priv->fb_heap;
220 int radeon_mem_alloc(struct drm_device *dev, void *data, struct drm_file *file_priv)
222 drm_radeon_private_t *dev_priv = dev->dev_private;
223 drm_radeon_mem_alloc_t *alloc = data;
224 struct mem_block *block, **heap;
227 DRM_ERROR("called with no initialization\n");
231 heap = get_heap(dev_priv, alloc->region);
235 /* Make things easier on ourselves: all allocations at least
238 if (alloc->alignment < 12)
239 alloc->alignment = 12;
241 block = alloc_block(*heap, alloc->size, alloc->alignment, file_priv);
246 if (DRM_COPY_TO_USER(alloc->region_offset, &block->start,
248 DRM_ERROR("copy_to_user\n");
255 int radeon_mem_free(struct drm_device *dev, void *data, struct drm_file *file_priv)
257 drm_radeon_private_t *dev_priv = dev->dev_private;
258 drm_radeon_mem_free_t *memfree = data;
259 struct mem_block *block, **heap;
262 DRM_ERROR("called with no initialization\n");
266 heap = get_heap(dev_priv, memfree->region);
270 block = find_block(*heap, memfree->region_offset);
274 if (block->file_priv != file_priv)
281 int radeon_mem_init_heap(struct drm_device *dev, void *data, struct drm_file *file_priv)
283 drm_radeon_private_t *dev_priv = dev->dev_private;
284 drm_radeon_mem_init_heap_t *initheap = data;
285 struct mem_block **heap;
288 DRM_ERROR("called with no initialization\n");
292 heap = get_heap(dev_priv, initheap->region);
297 DRM_ERROR("heap already initialized?");
301 return init_heap(heap, initheap->start, initheap->size);