3 * Memory management wrappers for DRM
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
10 * Created: Thu Feb 4 14:00:34 1999 by faith@valinux.com
12 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
14 * All Rights Reserved.
16 * Permission is hereby granted, free of charge, to any person obtaining a
17 * copy of this software and associated documentation files (the "Software"),
18 * to deal in the Software without restriction, including without limitation
19 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
20 * and/or sell copies of the Software, and to permit persons to whom the
21 * Software is furnished to do so, subject to the following conditions:
23 * The above copyright notice and this permission notice (including the next
24 * paragraph) shall be included in all copies or substantial portions of the
27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
28 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
29 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
30 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
31 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
32 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
33 * OTHER DEALINGS IN THE SOFTWARE.
36 #include <linux/config.h>
37 #include <linux/highmem.h>
41 #include "drm_memory_debug.h"
45 void drm_mem_init(void)
50 * Called when "/proc/dri/%dev%/mem" is read.
52 * \param buf output buffer.
53 * \param start start of output data.
54 * \param offset requested start offset.
55 * \param len requested number of bytes.
56 * \param eof whether there is no more data to return.
57 * \param data private data.
58 * \return number of written bytes.
62 int drm_mem_info(char *buf
, char **start
, off_t offset
,
63 int len
, int *eof
, void *data
)
68 /** Wrapper around kmalloc() and kfree() */
69 void *drm_realloc(void *oldpt
, size_t oldsize
, size_t size
, int area
)
73 if (!(pt
= kmalloc(size
, GFP_KERNEL
))) return NULL
;
74 if (oldpt
&& oldsize
) {
75 memcpy(pt
, oldpt
, oldsize
);
84 * \param order size order.
85 * \param area memory area. (Not used.)
86 * \return page address on success, or zero on failure.
88 * Allocate and reserve free pages.
90 unsigned long drm_alloc_pages(int order
, int area
)
92 unsigned long address
;
93 unsigned long bytes
= PAGE_SIZE
<< order
;
97 address
= __get_free_pages(GFP_KERNEL
, order
);
102 memset((void *)address
, 0, bytes
);
105 for (addr
= address
, sz
= bytes
;
107 addr
+= PAGE_SIZE
, sz
-= PAGE_SIZE
) {
108 SetPageReserved(virt_to_page(addr
));
117 * \param address address of the pages to free.
118 * \param order size order.
119 * \param area memory area. (Not used.)
121 * Unreserve and free pages allocated by alloc_pages().
123 void drm_free_pages(unsigned long address
, int order
, int area
)
125 unsigned long bytes
= PAGE_SIZE
<< order
;
133 for (addr
= address
, sz
= bytes
;
135 addr
+= PAGE_SIZE
, sz
-= PAGE_SIZE
) {
136 ClearPageReserved(virt_to_page(addr
));
139 free_pages(address
, order
);
144 /** Wrapper around agp_allocate_memory() */
145 DRM_AGP_MEM
*drm_alloc_agp(drm_device_t
*dev
, int pages
, u32 type
)
147 return drm_agp_allocate_memory(dev
->agp
->bridge
, pages
, type
);
149 EXPORT_SYMBOL(drm_alloc_agp
);
151 /** Wrapper around agp_free_memory() */
152 int drm_free_agp(DRM_AGP_MEM
*handle
, int pages
)
154 return drm_agp_free_memory(handle
) ? 0 : -EINVAL
;
156 EXPORT_SYMBOL(drm_free_agp
);
158 /** Wrapper around agp_bind_memory() */
159 int drm_bind_agp(DRM_AGP_MEM
*handle
, unsigned int start
)
161 return drm_agp_bind_memory(handle
, start
);
163 EXPORT_SYMBOL(drm_bind_agp
);
165 /** Wrapper around agp_unbind_memory() */
166 int drm_unbind_agp(DRM_AGP_MEM
*handle
)
168 return drm_agp_unbind_memory(handle
);
170 EXPORT_SYMBOL(drm_unbind_agp
);
172 #endif /* debug_memory */