#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
int DRM(sg_alloc)( DRM_IOCTL_ARGS )
{
return DRM_ERR(EINVAL);
}
int DRM(sg_free)( DRM_IOCTL_ARGS )
{
return DRM_ERR(EINVAL);
}
#endif