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  *
   29  * $FreeBSD: releng/5.0/sys/dev/drm/drm_scatter.h 97683 2002-05-31 23:19:50Z anholt $
   30  */
   31 
   32 #define __NO_VERSION__
   33 #include <linux/config.h>
   34 #include <linux/vmalloc.h>
   35 #include "dev/drm/drmP.h"
   36 
   37 #define DEBUG_SCATTER 0
   38 
   39 void DRM(sg_cleanup)( drm_sg_mem_t *entry )
   40 {
   41         struct page *page;
   42         int i;
   43 
   44         for ( i = 0 ; i < entry->pages ; i++ ) {
   45                 page = entry->pagelist[i];
   46                 if ( page )
   47                         ClearPageReserved( page );
   48         }
   49 
   50         vfree( entry->virtual );
   51 
   52         DRM(free)( entry->busaddr,
   53                    entry->pages * sizeof(*entry->busaddr),
   54                    DRM_MEM_PAGES );
   55         DRM(free)( entry->pagelist,
   56                    entry->pages * sizeof(*entry->pagelist),
   57                    DRM_MEM_PAGES );
   58         DRM(free)( entry,
   59                    sizeof(*entry),
   60                    DRM_MEM_SGLISTS );
   61 }
   62 
   63 int DRM(sg_alloc)( struct inode *inode, struct file *filp,
   64                    unsigned int cmd, unsigned long arg )
   65 {
   66         drm_file_t *priv = filp->private_data;
   67         drm_device_t *dev = priv->dev;
   68         drm_scatter_gather_t request;
   69         drm_sg_mem_t *entry;
   70         unsigned long pages, i, j;
   71         pgd_t *pgd;
   72         pmd_t *pmd;
   73         pte_t *pte;
   74 
   75         DRM_DEBUG( "%s\n", __func__ );
   76 
   77         if ( dev->sg )
   78                 return DRM_OS_ERR(EINVAL);
   79 
   80         if ( copy_from_user( &request,
   81                              (drm_scatter_gather_t *)arg,
   82                              sizeof(request) ) )
   83                 return DRM_OS_ERR(EFAULT);
   84 
   85         entry = DRM(alloc)( sizeof(*entry), DRM_MEM_SGLISTS );
   86         if ( !entry )
   87                 return DRM_OS_ERR(ENOMEM);
   88 
   89         memset( entry, 0, sizeof(*entry) );
   90 
   91         pages = (request.size + PAGE_SIZE - 1) / PAGE_SIZE;
   92         DRM_DEBUG( "sg size=%ld pages=%ld\n", request.size, pages );
   93 
   94         entry->pages = pages;
   95         entry->pagelist = DRM(alloc)( pages * sizeof(*entry->pagelist),
   96                                      DRM_MEM_PAGES );
   97         if ( !entry->pagelist ) {
   98                 DRM(free)( entry, sizeof(*entry), DRM_MEM_SGLISTS );
   99                 return DRM_OS_ERR(ENOMEM);
  100         }
  101 
  102         entry->busaddr = DRM(alloc)( pages * sizeof(*entry->busaddr),
  103                                      DRM_MEM_PAGES );
  104         if ( !entry->busaddr ) {
  105                 DRM(free)( entry->pagelist,
  106                            entry->pages * sizeof(*entry->pagelist),
  107                            DRM_MEM_PAGES );
  108                 DRM(free)( entry,
  109                            sizeof(*entry),
  110                            DRM_MEM_SGLISTS );
  111                 return DRM_OS_ERR(ENOMEM);
  112         }
  113         memset( (void *)entry->busaddr, 0, pages * sizeof(*entry->busaddr) );
  114 
  115         entry->virtual = vmalloc_32( pages << PAGE_SHIFT );
  116         if ( !entry->virtual ) {
  117                 DRM(free)( entry->busaddr,
  118                            entry->pages * sizeof(*entry->busaddr),
  119                            DRM_MEM_PAGES );
  120                 DRM(free)( entry->pagelist,
  121                            entry->pages * sizeof(*entry->pagelist),
  122                            DRM_MEM_PAGES );
  123                 DRM(free)( entry,
  124                            sizeof(*entry),
  125                            DRM_MEM_SGLISTS );
  126                 return DRM_OS_ERR(ENOMEM);
  127         }
  128 
  129         /* This also forces the mapping of COW pages, so our page list
  130          * will be valid.  Please don't remove it...
  131          */
  132         memset( entry->virtual, 0, pages << PAGE_SHIFT );
  133 
  134         entry->handle = (unsigned long)entry->virtual;
  135 
  136         DRM_DEBUG( "sg alloc handle  = %08lx\n", entry->handle );
  137         DRM_DEBUG( "sg alloc virtual = %p\n", entry->virtual );
  138 
  139         for ( i = entry->handle, j = 0 ; j < pages ; i += PAGE_SIZE, j++ ) {
  140                 pgd = pgd_offset_k( i );
  141                 if ( !pgd_present( *pgd ) )
  142                         goto failed;
  143 
  144                 pmd = pmd_offset( pgd, i );
  145                 if ( !pmd_present( *pmd ) )
  146                         goto failed;
  147 
  148                 pte = pte_offset( pmd, i );
  149                 if ( !pte_present( *pte ) )
  150                         goto failed;
  151 
  152                 entry->pagelist[j] = pte_page( *pte );
  153 
  154                 SetPageReserved( entry->pagelist[j] );
  155         }
  156 
  157         request.handle = entry->handle;
  158 
  159         if ( copy_to_user( (drm_scatter_gather_t *)arg,
  160                            &request,
  161                            sizeof(request) ) ) {
  162                 DRM(sg_cleanup)( entry );
  163                 return DRM_OS_ERR(EFAULT);
  164         }
  165 
  166         dev->sg = entry;
  167 
  168 #if DEBUG_SCATTER
  169         /* Verify that each page points to its virtual address, and vice
  170          * versa.
  171          */
  172         {
  173         int error = 0;
  174 
  175         for ( i = 0 ; i < pages ; i++ ) {
  176                 unsigned long *tmp;
  177 
  178                 tmp = page_address( entry->pagelist[i] );
  179                 for ( j = 0 ;
  180                       j < PAGE_SIZE / sizeof(unsigned long) ;
  181                       j++, tmp++ ) {
  182                         *tmp = 0xcafebabe;
  183                 }
  184                 tmp = (unsigned long *)((u8 *)entry->virtual +
  185                                         (PAGE_SIZE * i));
  186                 for( j = 0 ;
  187                      j < PAGE_SIZE / sizeof(unsigned long) ;
  188                      j++, tmp++ ) {
  189                         if ( *tmp != 0xcafebabe && error == 0 ) {
  190                                 error = 1;
  191                                 DRM_ERROR( "Scatter allocation error, "
  192                                            "pagelist does not match "
  193                                            "virtual mapping\n" );
  194                         }
  195                 }
  196                 tmp = page_address( entry->pagelist[i] );
  197                 for(j = 0 ;
  198                     j < PAGE_SIZE / sizeof(unsigned long) ;
  199                     j++, tmp++) {
  200                         *tmp = 0;
  201                 }
  202         }
  203         if (error == 0)
  204                 DRM_ERROR( "Scatter allocation matches pagelist\n" );
  205         }
  206 #endif
  207 
  208         return 0;
  209 
  210  failed:
  211         DRM(sg_cleanup)( entry );
  212         return DRM_OS_ERR(ENOMEM);
  213 }
  214 
  215 int DRM(sg_free)( struct inode *inode, struct file *filp,
  216                  unsigned int cmd, unsigned long arg )
  217 {
  218         drm_file_t *priv = filp->private_data;
  219         drm_device_t *dev = priv->dev;
  220         drm_scatter_gather_t request;
  221         drm_sg_mem_t *entry;
  222 
  223         if ( copy_from_user( &request,
  224                              (drm_scatter_gather_t *)arg,
  225                              sizeof(request) ) )
  226                 return DRM_OS_ERR(EFAULT);
  227 
  228         entry = dev->sg;
  229         dev->sg = NULL;
  230 
  231         if ( !entry || entry->handle != request.handle )
  232                 return DRM_OS_ERR(EINVAL);
  233 
  234         DRM_DEBUG( "sg free virtual  = %p\n", entry->virtual );
  235 
  236         DRM(sg_cleanup)( entry );
  237 
  238         return 0;
  239 }

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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