drivers/char/drm/drm_memory.c

   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 */