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 */