drm_scatter.c

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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  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD: releng/6.4/sys/dev/drm/drm_scatter.c 158686 2006-05-17 07:40:12Z anholt $");
   34 
   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         free((void *)entry->handle, M_DRM);
   42         free(entry->busaddr, M_DRM);
   43         free(entry, M_DRM);
   44 }
   45 
   46 int drm_sg_alloc(DRM_IOCTL_ARGS)
   47 {
   48         DRM_DEVICE;
   49         drm_scatter_gather_t request;
   50         drm_sg_mem_t *entry;
   51         unsigned long pages;
   52         int i;
   53 
   54         DRM_DEBUG( "%s\n", __FUNCTION__ );
   55 
   56         if ( dev->sg )
   57                 return EINVAL;
   58 
   59         DRM_COPY_FROM_USER_IOCTL(request, (drm_scatter_gather_t *)data,
   60                              sizeof(request) );
   61 
   62         entry = malloc(sizeof(*entry), M_DRM, M_WAITOK | M_ZERO);
   63         if ( !entry )
   64                 return ENOMEM;
   65 
   66         pages = round_page(request.size) / PAGE_SIZE;
   67         DRM_DEBUG( "sg size=%ld pages=%ld\n", request.size, pages );
   68 
   69         entry->pages = pages;
   70 
   71         entry->busaddr = malloc(pages * sizeof(*entry->busaddr), M_DRM,
   72             M_WAITOK | M_ZERO);
   73         if ( !entry->busaddr ) {
   74                 drm_sg_cleanup(entry);
   75                 return ENOMEM;
   76         }
   77 
   78         entry->handle = (long)malloc(pages << PAGE_SHIFT, M_DRM,
   79             M_WAITOK | M_ZERO);
   80         if (entry->handle == 0) {
   81                 drm_sg_cleanup(entry);
   82                 return ENOMEM;
   83         }
   84 
   85         for (i = 0; i < pages; i++) {
   86                 entry->busaddr[i] = vtophys(entry->handle + i * PAGE_SIZE);
   87         }
   88 
   89         DRM_DEBUG( "sg alloc handle  = %08lx\n", entry->handle );
   90 
   91         entry->virtual = (void *)entry->handle;
   92         request.handle = entry->handle;
   93 
   94         DRM_COPY_TO_USER_IOCTL( (drm_scatter_gather_t *)data,
   95                            request,
   96                            sizeof(request) );
   97 
   98         DRM_LOCK();
   99         if (dev->sg) {
  100                 DRM_UNLOCK();
  101                 drm_sg_cleanup(entry);
  102                 return EINVAL;
  103         }
  104         dev->sg = entry;
  105         DRM_UNLOCK();
  106 
  107         return 0;
  108 }
  109 
  110 int drm_sg_free(DRM_IOCTL_ARGS)
  111 {
  112         DRM_DEVICE;
  113         drm_scatter_gather_t request;
  114         drm_sg_mem_t *entry;
  115 
  116         DRM_COPY_FROM_USER_IOCTL( request, (drm_scatter_gather_t *)data,
  117                              sizeof(request) );
  118 
  119         DRM_LOCK();
  120         entry = dev->sg;
  121         dev->sg = NULL;
  122         DRM_UNLOCK();
  123 
  124         if ( !entry || entry->handle != request.handle )
  125                 return EINVAL;
  126 
  127         DRM_DEBUG( "sg free virtual  = 0x%lx\n", entry->handle );
  128 
  129         drm_sg_cleanup(entry);
  130 
  131         return 0;
  132 }

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

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