drivers/char/drm/drm_memory.c

   1 /**
   2  * \file drm_memory.c
   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() 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)))
  74                 return NULL;
  75         if (oldpt && oldsize) {
  76                 memcpy(pt, oldpt, oldsize);
  77                 kfree(oldpt);
  78         }
  79         return pt;
  80 }
  81
  82 /**
  83  * Allocate pages.
  84  *
  85  * \param order size order.
  86  * \param area memory area. (Not used.)
  87  * \return page address on success, or zero on failure.
  88  *
  89  * Allocate and reserve free pages.
  90  */
  91 unsigned long drm_alloc_pages(int order, int area)
  92 {
  93         unsigned long address;
  94         unsigned long bytes = PAGE_SIZE << order;
  95         unsigned long addr;
  96         unsigned int sz;
  97
  98         address = __get_free_pages(GFP_KERNEL|__GFP_COMP, order);
  99         if (!address)
 100                 return 0;
 101
 102         /* Zero */
 103         memset((void *)address, 0, bytes);
 104
 105         /* Reserve */
 106         for (addr = address, sz = bytes;
 107              sz > 0; 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; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
 135                 ClearPageReserved(virt_to_page(addr));
 136         }
 137
 138         free_pages(address, order);
 139 }
 140
 141 #if __OS_HAS_AGP
 142 /** Wrapper around agp_allocate_memory() */
 143 DRM_AGP_MEM *drm_alloc_agp(drm_device_t * dev, int pages, u32 type)
 144 {
 145         return drm_agp_allocate_memory(dev->agp->bridge, pages, type);
 146 }
 147
 148 EXPORT_SYMBOL(drm_alloc_agp);
 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 EXPORT_SYMBOL(drm_free_agp);
 157
 158 /** Wrapper around agp_bind_memory() */
 159 int drm_bind_agp(DRM_AGP_MEM * handle, unsigned int start)
 160 {
 161         return drm_agp_bind_memory(handle, start);
 162 }
 163
 164 EXPORT_SYMBOL(drm_bind_agp);
 165
 166 /** Wrapper around agp_unbind_memory() */
 167 int drm_unbind_agp(DRM_AGP_MEM * handle)
 168 {
 169         return drm_agp_unbind_memory(handle);
 170 }
 171
 172 EXPORT_SYMBOL(drm_unbind_agp);
 173 #endif                          /* agp */
 174 #endif                          /* debug_memory */