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/* drm_scatter.h -- IOCTLs to manage scatter/gather memory -*- linux-c -*-
* Created: Mon Dec 18 23:20:54 2000 by gareth@valinux.com
*
* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Authors:
* Gareth Hughes <gareth@valinux.com>
*/
#include "drmP.h"
#define DEBUG_SCATTER 0
#if __REALLY_HAVE_SG
void DRM(sg_cleanup)( drm_sg_mem_t *entry )
{
free( entry->virtual, DRM(M_DRM) );
DRM(free)( entry->busaddr,
entry->pages * sizeof(*entry->busaddr),
DRM_MEM_PAGES );
DRM(free)( entry,
sizeof(*entry),
DRM_MEM_SGLISTS );
}
int DRM(sg_alloc)( DRM_IOCTL_ARGS )
{
DRM_DEVICE;
drm_scatter_gather_t request;
drm_sg_mem_t *entry;
unsigned long pages;
DRM_DEBUG( "%s\n", __FUNCTION__ );
if ( dev->sg )
return EINVAL;
DRM_COPY_FROM_USER_IOCTL(request, (drm_scatter_gather_t *)data,
sizeof(request) );
entry = DRM(alloc)( sizeof(*entry), DRM_MEM_SGLISTS );
if ( !entry )
return ENOMEM;
bzero( entry, sizeof(*entry) );
pages = round_page(request.size) / PAGE_SIZE;
DRM_DEBUG( "sg size=%ld pages=%ld\n", request.size, pages );
entry->pages = pages;
entry->busaddr = DRM(alloc)( pages * sizeof(*entry->busaddr),
DRM_MEM_PAGES );
if ( !entry->busaddr ) {
DRM(free)( entry,
sizeof(*entry),
DRM_MEM_SGLISTS );
return ENOMEM;
}
bzero( (void *)entry->busaddr, pages * sizeof(*entry->busaddr) );
entry->virtual = malloc( pages << PAGE_SHIFT, DRM(M_DRM), M_WAITOK );
if ( !entry->virtual ) {
DRM(free)( entry->busaddr,
entry->pages * sizeof(*entry->busaddr),
DRM_MEM_PAGES );
DRM(free)( entry,
sizeof(*entry),
DRM_MEM_SGLISTS );
return ENOMEM;
}
bzero( entry->virtual, pages << PAGE_SHIFT );
entry->handle = (unsigned long)entry->virtual;
DRM_DEBUG( "sg alloc handle = %08lx\n", entry->handle );
DRM_DEBUG( "sg alloc virtual = %p\n", entry->virtual );
request.handle = entry->handle;
DRM_COPY_TO_USER_IOCTL( (drm_scatter_gather_t *)data,
request,
sizeof(request) );
dev->sg = entry;
return 0;
DRM(sg_cleanup)( entry );
return ENOMEM;
}
int DRM(sg_free)( DRM_IOCTL_ARGS )
{
DRM_DEVICE;
drm_scatter_gather_t request;
drm_sg_mem_t *entry;
DRM_COPY_FROM_USER_IOCTL( request, (drm_scatter_gather_t *)data,
sizeof(request) );
entry = dev->sg;
dev->sg = NULL;
if ( !entry || entry->handle != request.handle )
return EINVAL;
DRM_DEBUG( "sg free virtual = %p\n", entry->virtual );
DRM(sg_cleanup)( entry );
return 0;
}
#else /* __REALLY_HAVE_SG */
int DRM(sg_alloc)( DRM_IOCTL_ARGS )
{
return DRM_ERR(EINVAL);
}
int DRM(sg_free)( DRM_IOCTL_ARGS )
{
return DRM_ERR(EINVAL);
}
#endif
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