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>
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
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"
40 /* Very simple allocator for GART memory, working on a static range
41 * already mapped into each client's address space.
44 static struct mem_block *split_block(struct mem_block *p, int start, int size,
45 struct drm_file *file_priv)
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);
53 newblock->start = start;
54 newblock->size = p->size - (start - p->start);
55 newblock->file_priv = NULL;
56 newblock->next = p->next;
58 p->next->prev = newblock;
60 p->size -= newblock->size;
64 /* Maybe cut off the end of an existing block */
66 struct mem_block *newblock =
67 drm_alloc(sizeof(*newblock), DRM_MEM_BUFS);
70 newblock->start = start + size;
71 newblock->size = p->size - size;
72 newblock->file_priv = NULL;
73 newblock->next = p->next;
75 p->next->prev = newblock;
81 /* Our block is in the middle */
82 p->file_priv = file_priv;
86 static struct mem_block *alloc_block(struct mem_block *heap, int size,
87 int align2, struct drm_file *file_priv)
90 int mask = (1 << align2) - 1;
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);
101 static struct mem_block *find_block(struct mem_block *heap, int start)
105 list_for_each(p, heap)
106 if (p->start == start)
112 static void free_block(struct mem_block *p)
116 /* Assumes a single contiguous range. Needs a special file_priv in
117 * 'heap' to stop it being subsumed.
119 if (p->next->file_priv == NULL) {
120 struct mem_block *q = p->next;
124 drm_free(q, sizeof(*q), DRM_MEM_BUFS);
127 if (p->prev->file_priv == NULL) {
128 struct mem_block *q = p->prev;
132 drm_free(p, sizeof(*q), DRM_MEM_BUFS);
136 /* Initialize. How to check for an uninitialized heap?
138 static int init_heap(struct mem_block **heap, int start, int size)
140 struct mem_block *blocks = drm_alloc(sizeof(*blocks), DRM_MEM_BUFS);
145 *heap = drm_alloc(sizeof(**heap), DRM_MEM_BUFS);
147 drm_free(blocks, sizeof(*blocks), DRM_MEM_BUFS);
151 blocks->start = start;
153 blocks->file_priv = NULL;
154 blocks->next = blocks->prev = *heap;
156 memset(*heap, 0, sizeof(**heap));
157 (*heap)->file_priv = (struct drm_file *) - 1;
158 (*heap)->next = (*heap)->prev = blocks;
162 /* Free all blocks associated with the releasing file.
164 void radeon_mem_release(struct drm_file *file_priv, struct mem_block *heap)
168 if (!heap || !heap->next)
171 list_for_each(p, heap) {
172 if (p->file_priv == file_priv)
176 /* Assumes a single contiguous range. Needs a special file_priv in
177 * 'heap' to stop it being subsumed.
179 list_for_each(p, heap) {
180 while (p->file_priv == NULL && p->next->file_priv == NULL) {
181 struct mem_block *q = p->next;
185 drm_free(q, sizeof(*q), DRM_MEM_DRIVER);
192 void radeon_mem_takedown(struct mem_block **heap)
199 for (p = (*heap)->next; p != *heap;) {
200 struct mem_block *q = p;
202 drm_free(q, sizeof(*q), DRM_MEM_DRIVER);
205 drm_free(*heap, sizeof(**heap), DRM_MEM_DRIVER);
211 static struct mem_block **get_heap(drm_radeon_private_t * dev_priv, int 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;
223 int radeon_mem_alloc(struct drm_device *dev, void *data, struct drm_file *file_priv)
225 drm_radeon_private_t *dev_priv = dev->dev_private;
226 drm_radeon_mem_alloc_t *alloc = data;
227 struct mem_block *block, **heap;
230 DRM_ERROR("called with no initialization\n");
234 heap = get_heap(dev_priv, alloc->region);
238 /* Make things easier on ourselves: all allocations at least
241 if (alloc->alignment < 12)
242 alloc->alignment = 12;
244 block = alloc_block(*heap, alloc->size, alloc->alignment, file_priv);
249 if (DRM_COPY_TO_USER(alloc->region_offset, &block->start,
251 DRM_ERROR("copy_to_user\n");
258 int radeon_mem_free(struct drm_device *dev, void *data, struct drm_file *file_priv)
260 drm_radeon_private_t *dev_priv = dev->dev_private;
261 drm_radeon_mem_free_t *memfree = data;
262 struct mem_block *block, **heap;
265 DRM_ERROR("called with no initialization\n");
269 heap = get_heap(dev_priv, memfree->region);
273 block = find_block(*heap, memfree->region_offset);
277 if (block->file_priv != file_priv)
284 int radeon_mem_init_heap(struct drm_device *dev, void *data, struct drm_file *file_priv)
286 drm_radeon_private_t *dev_priv = dev->dev_private;
287 drm_radeon_mem_init_heap_t *initheap = data;
288 struct mem_block **heap;
291 DRM_ERROR("called with no initialization\n");
295 heap = get_heap(dev_priv, initheap->region);
300 DRM_ERROR("heap already initialized?");
304 return init_heap(heap, initheap->start, initheap->size);