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,
44 /* Maybe cut off the start of an existing block */
45 if (start > p->start) {
46 struct mem_block *newblock =
47 drm_alloc(sizeof(*newblock), DRM_MEM_BUFS);
50 newblock->start = start;
51 newblock->size = p->size - (start - p->start);
52 newblock->filp = 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 =
64 drm_alloc(sizeof(*newblock), DRM_MEM_BUFS);
67 newblock->start = start + size;
68 newblock->size = p->size - size;
69 newblock->filp = NULL;
70 newblock->next = p->next;
72 p->next->prev = newblock;
78 /* Our block is in the middle */
83 static struct mem_block *alloc_block(struct mem_block *heap, int size,
84 int align2, DRMFILE filp)
87 int mask = (1 << align2) - 1;
89 list_for_each(p, heap) {
90 int start = (p->start + mask) & ~mask;
91 if (p->filp == 0 && start + size <= p->start + p->size)
92 return split_block(p, start, size, filp);
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 filp in
114 * 'heap' to stop it being subsumed.
116 if (p->next->filp == 0) {
117 struct mem_block *q = p->next;
121 drm_free(q, sizeof(*q), DRM_MEM_BUFS);
124 if (p->prev->filp == 0) {
125 struct mem_block *q = p->prev;
129 drm_free(p, sizeof(*q), DRM_MEM_BUFS);
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 = drm_alloc(sizeof(*blocks), DRM_MEM_BUFS);
140 return DRM_ERR(ENOMEM);
142 *heap = drm_alloc(sizeof(**heap), DRM_MEM_BUFS);
144 drm_free(blocks, sizeof(*blocks), DRM_MEM_BUFS);
145 return DRM_ERR(ENOMEM);
148 blocks->start = start;
151 blocks->next = blocks->prev = *heap;
153 memset(*heap, 0, sizeof(**heap));
154 (*heap)->filp = (DRMFILE) - 1;
155 (*heap)->next = (*heap)->prev = blocks;
159 /* Free all blocks associated with the releasing file.
161 void radeon_mem_release(DRMFILE filp, struct mem_block *heap)
165 if (!heap || !heap->next)
168 list_for_each(p, heap) {
173 /* Assumes a single contiguous range. Needs a special filp in
174 * 'heap' to stop it being subsumed.
176 list_for_each(p, heap) {
177 while (p->filp == 0 && p->next->filp == 0) {
178 struct mem_block *q = p->next;
182 drm_free(q, sizeof(*q), DRM_MEM_DRIVER);
189 void radeon_mem_takedown(struct mem_block **heap)
196 for (p = (*heap)->next; p != *heap;) {
197 struct mem_block *q = p;
199 drm_free(q, sizeof(*q), DRM_MEM_DRIVER);
202 drm_free(*heap, sizeof(**heap), DRM_MEM_DRIVER);
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(DRM_IOCTL_ARGS)
223 drm_radeon_private_t *dev_priv = dev->dev_private;
224 drm_radeon_mem_alloc_t alloc;
225 struct mem_block *block, **heap;
228 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
229 return DRM_ERR(EINVAL);
232 DRM_COPY_FROM_USER_IOCTL(alloc, (drm_radeon_mem_alloc_t __user *) data,
235 heap = get_heap(dev_priv, alloc.region);
237 return DRM_ERR(EFAULT);
239 /* Make things easier on ourselves: all allocations at least
242 if (alloc.alignment < 12)
243 alloc.alignment = 12;
245 block = alloc_block(*heap, alloc.size, alloc.alignment, filp);
248 return DRM_ERR(ENOMEM);
250 if (DRM_COPY_TO_USER(alloc.region_offset, &block->start, sizeof(int))) {
251 DRM_ERROR("copy_to_user\n");
252 return DRM_ERR(EFAULT);
258 int radeon_mem_free(DRM_IOCTL_ARGS)
261 drm_radeon_private_t *dev_priv = dev->dev_private;
262 drm_radeon_mem_free_t memfree;
263 struct mem_block *block, **heap;
266 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
267 return DRM_ERR(EINVAL);
270 DRM_COPY_FROM_USER_IOCTL(memfree, (drm_radeon_mem_free_t __user *) data,
273 heap = get_heap(dev_priv, memfree.region);
275 return DRM_ERR(EFAULT);
277 block = find_block(*heap, memfree.region_offset);
279 return DRM_ERR(EFAULT);
281 if (block->filp != filp)
282 return DRM_ERR(EPERM);
288 int radeon_mem_init_heap(DRM_IOCTL_ARGS)
291 drm_radeon_private_t *dev_priv = dev->dev_private;
292 drm_radeon_mem_init_heap_t initheap;
293 struct mem_block **heap;
296 DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
297 return DRM_ERR(EINVAL);
300 DRM_COPY_FROM_USER_IOCTL(initheap,
301 (drm_radeon_mem_init_heap_t __user *) data,
304 heap = get_heap(dev_priv, initheap.region);
306 return DRM_ERR(EFAULT);
309 DRM_ERROR("heap already initialized?");
310 return DRM_ERR(EFAULT);
313 return init_heap(heap, initheap.start, initheap.size);