152 lines
3.8 KiB
C
152 lines
3.8 KiB
C
/* drm_scatter.h -- IOCTLs to manage scatter/gather memory -*- linux-c -*-
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* Created: Mon Dec 18 23:20:54 2000 by gareth@valinux.com
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*
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Authors:
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* Gareth Hughes <gareth@valinux.com>
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*
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* $FreeBSD: src/sys/dev/drm/drm_scatter.h,v 1.4 2003/03/09 02:08:28 anholt Exp $
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*/
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#include "drmP.h"
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#define DEBUG_SCATTER 0
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#if __REALLY_HAVE_SG
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void DRM(sg_cleanup)( drm_sg_mem_t *entry )
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{
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free( entry->virtual, DRM(M_DRM) );
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DRM(free)( entry->busaddr,
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entry->pages * sizeof(*entry->busaddr),
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DRM_MEM_PAGES );
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DRM(free)( entry,
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sizeof(*entry),
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DRM_MEM_SGLISTS );
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}
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int DRM(sg_alloc)( DRM_IOCTL_ARGS )
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{
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DRM_DEVICE;
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drm_scatter_gather_t request;
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drm_sg_mem_t *entry;
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unsigned long pages;
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DRM_DEBUG( "%s\n", __FUNCTION__ );
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if ( dev->sg )
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return EINVAL;
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DRM_COPY_FROM_USER_IOCTL(request, (drm_scatter_gather_t *)data,
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sizeof(request) );
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entry = DRM(alloc)( sizeof(*entry), DRM_MEM_SGLISTS );
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if ( !entry )
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return ENOMEM;
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bzero( entry, sizeof(*entry) );
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pages = round_page(request.size) / PAGE_SIZE;
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DRM_DEBUG( "sg size=%ld pages=%ld\n", request.size, pages );
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entry->pages = pages;
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entry->busaddr = DRM(alloc)( pages * sizeof(*entry->busaddr),
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DRM_MEM_PAGES );
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if ( !entry->busaddr ) {
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DRM(free)( entry,
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sizeof(*entry),
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DRM_MEM_SGLISTS );
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return ENOMEM;
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}
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bzero( (void *)entry->busaddr, pages * sizeof(*entry->busaddr) );
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entry->virtual = malloc( pages << PAGE_SHIFT, DRM(M_DRM), M_WAITOK );
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if ( !entry->virtual ) {
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DRM(free)( entry->busaddr,
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entry->pages * sizeof(*entry->busaddr),
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DRM_MEM_PAGES );
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DRM(free)( entry,
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sizeof(*entry),
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DRM_MEM_SGLISTS );
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return ENOMEM;
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}
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bzero( entry->virtual, pages << PAGE_SHIFT );
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entry->handle = (unsigned long)entry->virtual;
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DRM_DEBUG( "sg alloc handle = %08lx\n", entry->handle );
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DRM_DEBUG( "sg alloc virtual = %p\n", entry->virtual );
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request.handle = entry->handle;
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DRM_COPY_TO_USER_IOCTL( (drm_scatter_gather_t *)data,
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request,
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sizeof(request) );
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dev->sg = entry;
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return 0;
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DRM(sg_cleanup)( entry );
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return ENOMEM;
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}
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int DRM(sg_free)( DRM_IOCTL_ARGS )
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{
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DRM_DEVICE;
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drm_scatter_gather_t request;
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drm_sg_mem_t *entry;
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DRM_COPY_FROM_USER_IOCTL( request, (drm_scatter_gather_t *)data,
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sizeof(request) );
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entry = dev->sg;
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dev->sg = NULL;
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if ( !entry || entry->handle != request.handle )
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return EINVAL;
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DRM_DEBUG( "sg free virtual = %p\n", entry->virtual );
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DRM(sg_cleanup)( entry );
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return 0;
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}
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#else /* __REALLY_HAVE_SG */
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int DRM(sg_alloc)( DRM_IOCTL_ARGS )
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{
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return DRM_ERR(EINVAL);
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}
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int DRM(sg_free)( DRM_IOCTL_ARGS )
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{
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return DRM_ERR(EINVAL);
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}
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#endif
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