sys/dev/drm/drm_scatter.h

   1 /* drm_scatter.h -- IOCTLs to manage scatter/gather memory -*- linux-c -*-
   2  * Created: Mon Dec 18 23:20:54 2000 by gareth@valinux.com
   3  *
   4  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
   5  * All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the next
  15  * paragraph) shall be included in all copies or substantial portions of the
  16  * Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  22  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  23  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  24  * DEALINGS IN THE SOFTWARE.
  25  *
  26  * Authors:
  27  *   Gareth Hughes <gareth@valinux.com>
  28  *
  29  * $FreeBSD: src/sys/dev/drm/drm_scatter.h,v 1.4.2.1 2003/04/26 07:05:28 anholt Exp $
  30  * $DragonFly: src/sys/dev/drm/Attic/drm_scatter.h,v 1.5 2008/01/06 16:55:49 swildner Exp $
  31  */
  32
  33 #include "dev/drm/drmP.h"
  34
  35 #define DEBUG_SCATTER 0
  36
  37 #if __REALLY_HAVE_SG
  38
  39 void DRM(sg_cleanup)( drm_sg_mem_t *entry )
  40 {
  41         kfree( entry->virtual, DRM(M_DRM) );
  42
  43         DRM(free)( entry->busaddr,
  44                    entry->pages * sizeof(*entry->busaddr),
  45                    DRM_MEM_PAGES );
  46         DRM(free)( entry,
  47                    sizeof(*entry),
  48                    DRM_MEM_SGLISTS );
  49 }
  50
  51 int DRM(sg_alloc)( DRM_IOCTL_ARGS )
  52 {
  53         DRM_DEVICE;
  54         drm_scatter_gather_t request;
  55         drm_sg_mem_t *entry;
  56         unsigned long pages;
  57
  58         DRM_DEBUG( "%s\n", __func__ );
  59
  60         if ( dev->sg )
  61                 return EINVAL;
  62
  63         DRM_COPY_FROM_USER_IOCTL(request, (drm_scatter_gather_t *)data,
  64                              sizeof(request) );
  65
  66         entry = DRM(alloc)( sizeof(*entry), DRM_MEM_SGLISTS );
  67         if ( !entry )
  68                 return ENOMEM;
  69
  70         bzero( entry, sizeof(*entry) );
  71
  72         pages = round_page(request.size) / PAGE_SIZE;
  73         DRM_DEBUG( "sg size=%ld pages=%ld\n", request.size, pages );
  74
  75         entry->pages = pages;
  76
  77         entry->busaddr = DRM(alloc)( pages * sizeof(*entry->busaddr),
  78                                      DRM_MEM_PAGES );
  79         if ( !entry->busaddr ) {
  80                 DRM(free)( entry,
  81                            sizeof(*entry),
  82                            DRM_MEM_SGLISTS );
  83                 return ENOMEM;
  84         }
  85         bzero( (void *)entry->busaddr, pages * sizeof(*entry->busaddr) );
  86
  87         entry->virtual = kmalloc( pages << PAGE_SHIFT, DRM(M_DRM), M_WAITOK );
  88         bzero( entry->virtual, pages << PAGE_SHIFT );
  89
  90         entry->handle = (unsigned long)entry->virtual;
  91
  92         DRM_DEBUG( "sg alloc handle  = %08lx\n", entry->handle );
  93         DRM_DEBUG( "sg alloc virtual = %p\n", entry->virtual );
  94
  95         request.handle = entry->handle;
  96
  97         DRM_COPY_TO_USER_IOCTL( (drm_scatter_gather_t *)data,
  98                            request,
  99                            sizeof(request) );
 100
 101         dev->sg = entry;
 102
 103         return 0;
 104
 105         DRM(sg_cleanup)( entry );
 106         return ENOMEM;
 107 }
 108
 109 int DRM(sg_free)( DRM_IOCTL_ARGS )
 110 {
 111         DRM_DEVICE;
 112         drm_scatter_gather_t request;
 113         drm_sg_mem_t *entry;
 114
 115         DRM_COPY_FROM_USER_IOCTL( request, (drm_scatter_gather_t *)data,
 116                              sizeof(request) );
 117
 118         entry = dev->sg;
 119         dev->sg = NULL;
 120
 121         if ( !entry || entry->handle != request.handle )
 122                 return EINVAL;
 123
 124         DRM_DEBUG( "sg free virtual  = %p\n", entry->virtual );
 125
 126         DRM(sg_cleanup)( entry );
 127
 128         return 0;
 129 }
 130
 131 #else /* __REALLY_HAVE_SG */
 132
 133 int DRM(sg_alloc)( DRM_IOCTL_ARGS )
 134 {
 135         return DRM_ERR(EINVAL);
 136 }
 137 int DRM(sg_free)( DRM_IOCTL_ARGS )
 138 {
 139         return DRM_ERR(EINVAL);
 140 }
 141
 142 #endif