drm_scatter.h

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    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  *   Eric Anholt <anholt@FreeBSD.org>
   29  *
   30  * $FreeBSD$
   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         free( 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", __FUNCTION__ );
   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 = malloc( pages << PAGE_SHIFT, DRM(M_DRM), M_WAITOK );
   88         if ( !entry->virtual ) {
   89                 DRM(free)( entry->busaddr,
   90                            entry->pages * sizeof(*entry->busaddr),
   91                            DRM_MEM_PAGES );
   92                 DRM(free)( entry,
   93                            sizeof(*entry),
   94                            DRM_MEM_SGLISTS );
   95                 return ENOMEM;
   96         }
   97 
   98         bzero( entry->virtual, pages << PAGE_SHIFT );
   99 
  100         entry->handle = (unsigned long)entry->virtual;
  101 
  102         DRM_DEBUG( "sg alloc handle  = %08lx\n", entry->handle );
  103         DRM_DEBUG( "sg alloc virtual = %p\n", entry->virtual );
  104 
  105         request.handle = entry->handle;
  106 
  107         DRM_COPY_TO_USER_IOCTL( (drm_scatter_gather_t *)data,
  108                            request,
  109                            sizeof(request) );
  110 
  111         dev->sg = entry;
  112 
  113         return 0;
  114 
  115         DRM(sg_cleanup)( entry );
  116         return ENOMEM;
  117 }
  118 
  119 int DRM(sg_free)( DRM_IOCTL_ARGS )
  120 {
  121         DRM_DEVICE;
  122         drm_scatter_gather_t request;
  123         drm_sg_mem_t *entry;
  124 
  125         DRM_COPY_FROM_USER_IOCTL( request, (drm_scatter_gather_t *)data,
  126                              sizeof(request) );
  127 
  128         entry = dev->sg;
  129         dev->sg = NULL;
  130 
  131         if ( !entry || entry->handle != request.handle )
  132                 return EINVAL;
  133 
  134         DRM_DEBUG( "sg free virtual  = %p\n", entry->virtual );
  135 
  136         DRM(sg_cleanup)( entry );
  137 
  138         return 0;
  139 }
  140 
  141 #else /* __REALLY_HAVE_SG */
  142 
  143 int DRM(sg_alloc)( DRM_IOCTL_ARGS )
  144 {
  145         return DRM_ERR(EINVAL);
  146 }
  147 int DRM(sg_free)( DRM_IOCTL_ARGS )
  148 {
  149         return DRM_ERR(EINVAL);
  150 }
  151 
  152 #endif

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FreeBSD/Linux Kernel Cross Reference sys/dev/drm/drm_scatter.h

FreeBSD/Linux Kernel Cross Reference
sys/dev/drm/drm_scatter.h