projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /** |
| 2 | * \file drm_memory.h | |
| 3 | * Memory management wrappers for DRM | |
| 4 | * | |
| 5 | * \author Rickard E. (Rik) Faith <[email protected]> | |
| 6 | * \author Gareth Hughes <[email protected]> | |
| 7 | */ | |
| 8 | ||
| 9 | /* | |
| 10 | * Created: Thu Feb 4 14:00:34 1999 by [email protected] | |
| 11 | * | |
| 12 | * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. | |
| 13 | * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. | |
| 14 | * All Rights Reserved. | |
| 15 | * | |
| 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: | |
| 22 | * | |
| 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 | |
| 25 | * Software. | |
| 26 | * | |
| 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. | |
| 34 | */ | |
| 35 | ||
| 36 | #include <linux/config.h> | |
| 37 | #include <linux/highmem.h> | |
| 38 | #include "drmP.h" | |
| 39 | ||
| 40 | #ifdef DEBUG_MEMORY | |
| 41 | #include "drm_memory_debug.h" | |
| 42 | #else | |
| 43 | ||
| 44 | /** No-op. */ | |
| 45 | void drm_mem_init(void) | |
| 46 | { | |
| 47 | } | |
| 48 | ||
| 49 | /** | |
| 50 | * Called when "/proc/dri/%dev%/mem" is read. | |
| 51 | * | |
| 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. | |
| 59 | * | |
| 60 | * No-op. | |
| 61 | */ | |
| 62 | int drm_mem_info(char *buf, char **start, off_t offset, | |
| 63 | int len, int *eof, void *data) | |
| 64 | { | |
| 65 | return 0; | |
| 66 | } | |
| 67 | ||
| 1da177e4 LT |
68 | /** Wrapper around kmalloc() and kfree() */ |
| 69 | void *drm_realloc(void *oldpt, size_t oldsize, size_t size, int area) | |
| 70 | { | |
| 71 | void *pt; | |
| 72 | ||
| 73 | if (!(pt = kmalloc(size, GFP_KERNEL))) return NULL; | |
| 74 | if (oldpt && oldsize) { | |
| 75 | memcpy(pt, oldpt, oldsize); | |
| 76 | kfree(oldpt); | |
| 77 | } | |
| 78 | return pt; | |
| 79 | } | |
| 80 | ||
| 81 | /** | |
| 82 | * Allocate pages. | |
| 83 | * | |
| 84 | * \param order size order. | |
| 85 | * \param area memory area. (Not used.) | |
| 86 | * \return page address on success, or zero on failure. | |
| 87 | * | |
| 88 | * Allocate and reserve free pages. | |
| 89 | */ | |
| 90 | unsigned long drm_alloc_pages(int order, int area) | |
| 91 | { | |
| 92 | unsigned long address; | |
| 93 | unsigned long bytes = PAGE_SIZE << order; | |
| 94 | unsigned long addr; | |
| 95 | unsigned int sz; | |
| 96 | ||
| 97 | address = __get_free_pages(GFP_KERNEL, order); | |
| 98 | if (!address) | |
| 99 | return 0; | |
| 100 | ||
| 101 | /* Zero */ | |
| 102 | memset((void *)address, 0, bytes); | |
| 103 | ||
| 104 | /* Reserve */ | |
| 105 | for (addr = address, sz = bytes; | |
| 106 | sz > 0; | |
| 107 | addr += PAGE_SIZE, sz -= PAGE_SIZE) { | |
| 108 | SetPageReserved(virt_to_page(addr)); | |
| 109 | } | |
| 110 | ||
| 111 | return address; | |
| 112 | } | |
| 113 | ||
| 114 | /** | |
| 115 | * Free pages. | |
| 116 | * | |
| 117 | * \param address address of the pages to free. | |
| 118 | * \param order size order. | |
| 119 | * \param area memory area. (Not used.) | |
| 120 | * | |
| 121 | * Unreserve and free pages allocated by alloc_pages(). | |
| 122 | */ | |
| 123 | void drm_free_pages(unsigned long address, int order, int area) | |
| 124 | { | |
| 125 | unsigned long bytes = PAGE_SIZE << order; | |
| 126 | unsigned long addr; | |
| 127 | unsigned int sz; | |
| 128 | ||
| 129 | if (!address) | |
| 130 | return; | |
| 131 | ||
| 132 | /* Unreserve */ | |
| 133 | for (addr = address, sz = bytes; | |
| 134 | sz > 0; | |
| 135 | addr += PAGE_SIZE, sz -= PAGE_SIZE) { | |
| 136 | ClearPageReserved(virt_to_page(addr)); | |
| 137 | } | |
| 138 | ||
| 139 | free_pages(address, order); | |
| 140 | } | |
| 141 | ||
| 142 | ||
| 143 | #if __OS_HAS_AGP | |
| 144 | /** Wrapper around agp_allocate_memory() */ | |
| 145 | DRM_AGP_MEM *drm_alloc_agp(struct agp_bridge_data *bridge, int pages, u32 type) | |
| 146 | { | |
| 147 | return drm_agp_allocate_memory(bridge, pages, type); | |
| 148 | } | |
| 149 | ||
| 150 | /** Wrapper around agp_free_memory() */ | |
| 151 | int drm_free_agp(DRM_AGP_MEM *handle, int pages) | |
| 152 | { | |
| 153 | return drm_agp_free_memory(handle) ? 0 : -EINVAL; | |
| 154 | } | |
| 155 | ||
| 156 | /** Wrapper around agp_bind_memory() */ | |
| 157 | int drm_bind_agp(DRM_AGP_MEM *handle, unsigned int start) | |
| 158 | { | |
| 159 | return drm_agp_bind_memory(handle, start); | |
| 160 | } | |
| 161 | ||
| 162 | /** Wrapper around agp_unbind_memory() */ | |
| 163 | int drm_unbind_agp(DRM_AGP_MEM *handle) | |
| 164 | { | |
| 165 | return drm_agp_unbind_memory(handle); | |
| 166 | } | |
| 167 | #endif /* agp */ | |
| 168 | #endif /* debug_memory */ |