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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>
* Eric Anholt <anholt@FreeBSD.org>
*
*/
#include "drmP.h"
#define DEBUG_SCATTER 0
void drm_sg_cleanup(drm_sg_mem_t *entry)
{
free((void *)entry->handle, M_DRM);
free(entry->busaddr, M_DRM);
free(entry, M_DRM);
}
int drm_sg_alloc(drm_device_t * dev, drm_scatter_gather_t * request)
{
drm_sg_mem_t *entry;
unsigned long pages;
int i;
if ( dev->sg )
return EINVAL;
entry = malloc(sizeof(*entry), M_DRM, M_WAITOK | M_ZERO);
if ( !entry )
return ENOMEM;
pages = round_page(request->size) / PAGE_SIZE;
DRM_DEBUG( "sg size=%ld pages=%ld\n", request->size, pages );
entry->pages = pages;
entry->busaddr = malloc(pages * sizeof(*entry->busaddr), M_DRM,
M_WAITOK | M_ZERO);
if ( !entry->busaddr ) {
drm_sg_cleanup(entry);
return ENOMEM;
}
entry->handle = (long)malloc(pages << PAGE_SHIFT, M_DRM,
M_WAITOK | M_ZERO);
if (entry->handle == 0) {
drm_sg_cleanup(entry);
return ENOMEM;
}
for (i = 0; i < pages; i++) {
entry->busaddr[i] = vtophys(entry->handle + i * PAGE_SIZE);
}
DRM_DEBUG( "sg alloc handle = %08lx\n", entry->handle );
entry->virtual = (void *)entry->handle;
request->handle = entry->handle;
DRM_LOCK();
if (dev->sg) {
DRM_UNLOCK();
drm_sg_cleanup(entry);
return EINVAL;
}
dev->sg = entry;
DRM_UNLOCK();
return 0;
}
int drm_sg_alloc_ioctl(DRM_IOCTL_ARGS)
{
DRM_DEVICE;
drm_scatter_gather_t request;
int ret;
DRM_DEBUG( "%s\n", __FUNCTION__ );
DRM_COPY_FROM_USER_IOCTL(request, (drm_scatter_gather_t *)data,
sizeof(request) );
ret = drm_sg_alloc(dev, &request);
if ( ret ) return ret;
DRM_COPY_TO_USER_IOCTL( (drm_scatter_gather_t *)data,
request,
sizeof(request) );
return 0;
}
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) );
DRM_LOCK();
entry = dev->sg;
dev->sg = NULL;
DRM_UNLOCK();
if ( !entry || entry->handle != request.handle )
return EINVAL;
DRM_DEBUG( "sg free virtual = 0x%lx\n", entry->handle );
drm_sg_cleanup(entry);
return 0;
}
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