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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->pagelist,
entry->pages * sizeof(*entry->pagelist),
DRM_MEM_PAGES );
DRM(free)( entry,
sizeof(*entry),
DRM_MEM_SGLISTS );
}
int DRM(sg_alloc)( DRM_OS_IOCTL )
{
DRM_OS_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_OS_KRNFROMUSR(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->pagelist = DRM(alloc)( pages * sizeof(*entry->pagelist),
DRM_MEM_PAGES );
if ( !entry->pagelist ) {
DRM(free)( entry, sizeof(*entry), DRM_MEM_SGLISTS );
return ENOMEM;
}
bzero(entry->pagelist, pages * sizeof(*entry->pagelist));
entry->busaddr = DRM(alloc)( pages * sizeof(*entry->busaddr),
DRM_MEM_PAGES );
if ( !entry->busaddr ) {
DRM(free)( entry->pagelist,
entry->pages * sizeof(*entry->pagelist),
DRM_MEM_PAGES );
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->pagelist,
entry->pages * sizeof(*entry->pagelist),
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_OS_KRNTOUSR( (drm_scatter_gather_t *)data,
request,
sizeof(request) );
dev->sg = entry;
#if DEBUG_SCATTER
/* Verify that each page points to its virtual address, and vice
* versa.
*/
{
int error = 0;
for ( i = 0 ; i < pages ; i++ ) {
unsigned long *tmp;
tmp = page_address( entry->pagelist[i] );
for ( j = 0 ;
j < PAGE_SIZE / sizeof(unsigned long) ;
j++, tmp++ ) {
*tmp = 0xcafebabe;
}
tmp = (unsigned long *)((u8 *)entry->virtual +
(PAGE_SIZE * i));
for( j = 0 ;
j < PAGE_SIZE / sizeof(unsigned long) ;
j++, tmp++ ) {
if ( *tmp != 0xcafebabe && error == 0 ) {
error = 1;
DRM_ERROR( "Scatter allocation error, "
"pagelist does not match "
"virtual mapping\n" );
}
}
tmp = page_address( entry->pagelist[i] );
for(j = 0 ;
j < PAGE_SIZE / sizeof(unsigned long) ;
j++, tmp++) {
*tmp = 0;
}
}
if (error == 0)
DRM_ERROR( "Scatter allocation matches pagelist\n" );
}
#endif
return 0;
DRM(sg_cleanup)( entry );
return ENOMEM;
}
int DRM(sg_free)( DRM_OS_IOCTL )
{
DRM_OS_DEVICE;
drm_scatter_gather_t request;
drm_sg_mem_t *entry;
DRM_OS_KRNFROMUSR( 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_OS_IOCTL )
{
return DRM_OS_ERR(EINVAL);
}
int DRM(sg_free)( DRM_OS_IOCTL )
{
return DRM_OS_ERR(EINVAL);
}
#endif
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