Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /** |
| 2 | * \file drm_memory.h |
| 3 | * Memory management wrappers for DRM |
| 4 | * |
| 5 | * \author Rickard E. (Rik) Faith <faith@valinux.com> |
| 6 | * \author Gareth Hughes <gareth@valinux.com> |
| 7 | */ |
| 8 | |
| 9 | /* |
| 10 | * Created: Thu Feb 4 14:00:34 1999 by faith@valinux.com |
| 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 | |
| 68 | /** Wrapper around kmalloc() */ |
| 69 | void *drm_calloc(size_t nmemb, size_t size, int area) |
| 70 | { |
| 71 | void *addr; |
| 72 | |
| 73 | addr = kmalloc(size * nmemb, GFP_KERNEL); |
| 74 | if (addr != NULL) |
| 75 | memset((void *)addr, 0, size * nmemb); |
| 76 | |
| 77 | return addr; |
| 78 | } |
| 79 | EXPORT_SYMBOL(drm_calloc); |
| 80 | |
| 81 | /** Wrapper around kmalloc() and kfree() */ |
| 82 | void *drm_realloc(void *oldpt, size_t oldsize, size_t size, int area) |
| 83 | { |
| 84 | void *pt; |
| 85 | |
| 86 | if (!(pt = kmalloc(size, GFP_KERNEL))) return NULL; |
| 87 | if (oldpt && oldsize) { |
| 88 | memcpy(pt, oldpt, oldsize); |
| 89 | kfree(oldpt); |
| 90 | } |
| 91 | return pt; |
| 92 | } |
| 93 | |
| 94 | /** |
| 95 | * Allocate pages. |
| 96 | * |
| 97 | * \param order size order. |
| 98 | * \param area memory area. (Not used.) |
| 99 | * \return page address on success, or zero on failure. |
| 100 | * |
| 101 | * Allocate and reserve free pages. |
| 102 | */ |
| 103 | unsigned long drm_alloc_pages(int order, int area) |
| 104 | { |
| 105 | unsigned long address; |
| 106 | unsigned long bytes = PAGE_SIZE << order; |
| 107 | unsigned long addr; |
| 108 | unsigned int sz; |
| 109 | |
| 110 | address = __get_free_pages(GFP_KERNEL, order); |
| 111 | if (!address) |
| 112 | return 0; |
| 113 | |
| 114 | /* Zero */ |
| 115 | memset((void *)address, 0, bytes); |
| 116 | |
| 117 | /* Reserve */ |
| 118 | for (addr = address, sz = bytes; |
| 119 | sz > 0; |
| 120 | addr += PAGE_SIZE, sz -= PAGE_SIZE) { |
| 121 | SetPageReserved(virt_to_page(addr)); |
| 122 | } |
| 123 | |
| 124 | return address; |
| 125 | } |
| 126 | |
| 127 | /** |
| 128 | * Free pages. |
| 129 | * |
| 130 | * \param address address of the pages to free. |
| 131 | * \param order size order. |
| 132 | * \param area memory area. (Not used.) |
| 133 | * |
| 134 | * Unreserve and free pages allocated by alloc_pages(). |
| 135 | */ |
| 136 | void drm_free_pages(unsigned long address, int order, int area) |
| 137 | { |
| 138 | unsigned long bytes = PAGE_SIZE << order; |
| 139 | unsigned long addr; |
| 140 | unsigned int sz; |
| 141 | |
| 142 | if (!address) |
| 143 | return; |
| 144 | |
| 145 | /* Unreserve */ |
| 146 | for (addr = address, sz = bytes; |
| 147 | sz > 0; |
| 148 | addr += PAGE_SIZE, sz -= PAGE_SIZE) { |
| 149 | ClearPageReserved(virt_to_page(addr)); |
| 150 | } |
| 151 | |
| 152 | free_pages(address, order); |
| 153 | } |
| 154 | |
| 155 | |
| 156 | #if __OS_HAS_AGP |
| 157 | /** Wrapper around agp_allocate_memory() */ |
| 158 | DRM_AGP_MEM *drm_alloc_agp(struct agp_bridge_data *bridge, int pages, u32 type) |
| 159 | { |
| 160 | return drm_agp_allocate_memory(bridge, pages, type); |
| 161 | } |
| 162 | |
| 163 | /** Wrapper around agp_free_memory() */ |
| 164 | int drm_free_agp(DRM_AGP_MEM *handle, int pages) |
| 165 | { |
| 166 | return drm_agp_free_memory(handle) ? 0 : -EINVAL; |
| 167 | } |
| 168 | |
| 169 | /** Wrapper around agp_bind_memory() */ |
| 170 | int drm_bind_agp(DRM_AGP_MEM *handle, unsigned int start) |
| 171 | { |
| 172 | return drm_agp_bind_memory(handle, start); |
| 173 | } |
| 174 | |
| 175 | /** Wrapper around agp_unbind_memory() */ |
| 176 | int drm_unbind_agp(DRM_AGP_MEM *handle) |
| 177 | { |
| 178 | return drm_agp_unbind_memory(handle); |
| 179 | } |
| 180 | #endif /* agp */ |
| 181 | #endif /* debug_memory */ |