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 #if __OS_HAS_AGP
  83 /** Wrapper around agp_allocate_memory() */
  84 DRM_AGP_MEM *drm_alloc_agp(drm_device_t * dev, int pages, u32 type)
  85 {
  86         return drm_agp_allocate_memory(dev->agp->bridge, pages, type);
  87 }
  88
  89 /** Wrapper around agp_free_memory() */
  90 int drm_free_agp(DRM_AGP_MEM * handle, int pages)
  91 {
  92         return drm_agp_free_memory(handle) ? 0 : -EINVAL;
  93 }
  94
  95 /** Wrapper around agp_bind_memory() */
  96 int drm_bind_agp(DRM_AGP_MEM * handle, unsigned int start)
  97 {
  98         return drm_agp_bind_memory(handle, start);
  99 }
 100
 101 /** Wrapper around agp_unbind_memory() */
 102 int drm_unbind_agp(DRM_AGP_MEM * handle)
 103 {
 104         return drm_agp_unbind_memory(handle);
 105 }
 106 #endif                          /* agp */
 107 #endif                          /* debug_memory */