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
);