bsd-core/drm_bufs.c


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/* drm_bufs.h -- Generic buffer template -*- linux-c -*-
 * Created: Thu Nov 23 03:10:50 2000 by gareth@valinux.com
 *
 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
 * 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
 * VA LINUX SYSTEMS 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:
 *    Rickard E. (Rik) Faith <faith@valinux.com>
 *    Gareth Hughes <gareth@valinux.com>
 */

#define __NO_VERSION__
#include <machine/param.h>
#include <sys/mman.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <vm/vm_extern.h>
#include <vm/vm_map.h>
#include <vm/vm_param.h>
#include "drmP.h"

#ifndef __HAVE_PCI_DMA
#define __HAVE_PCI_DMA		0
#endif

#ifndef __HAVE_SG
#define __HAVE_SG		0
#endif

#ifndef DRIVER_BUF_PRIV_T
#define DRIVER_BUF_PRIV_T		u32
#endif
#ifndef DRIVER_AGP_BUFFERS_MAP
#if __HAVE_AGP && __HAVE_DMA
#error "You must define DRIVER_AGP_BUFFERS_MAP()"
#else
#define DRIVER_AGP_BUFFERS_MAP( dev )	NULL
#endif
#endif

/*
 * Compute order.  Can be made faster.
 */
int DRM(order)( unsigned long size )
{
	int order;
	unsigned long tmp;

	for ( order = 0, tmp = size ; tmp >>= 1 ; ++order );

	if ( size & ~(1 << order) )
		++order;

	return order;
}

int DRM(addmap)( DRM_OS_IOCTL )
{
	DRM_OS_DEVICE;
	drm_map_t *map;
	drm_map_list_entry_t *list;

	if (!(dev->flags & (FREAD|FWRITE)))
		DRM_OS_RETURN(EACCES); /* Require read/write */

	map = (drm_map_t *) DRM(alloc)( sizeof(*map), DRM_MEM_MAPS );
	if ( !map )
		DRM_OS_RETURN(ENOMEM);

	*map = *(drm_map_t *)data;

	/* Only allow shared memory to be removable since we only keep enough
	 * book keeping information about shared memory to allow for removal
	 * when processes fork.
	 */
	if ( (map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM ) {
		DRM(free)( map, sizeof(*map), DRM_MEM_MAPS );
		DRM_OS_RETURN(EINVAL);
	}
	DRM_DEBUG( "offset = 0x%08lx, size = 0x%08lx, type = %d\n",
		   map->offset, map->size, map->type );
	if ( (map->offset & PAGE_MASK) || (map->size & PAGE_MASK) ) {
		DRM(free)( map, sizeof(*map), DRM_MEM_MAPS );
		DRM_OS_RETURN(EINVAL);
	}
	map->mtrr   = -1;
	map->handle = 0;

	TAILQ_FOREACH(list, dev->maplist, link) {
		drm_map_t *entry = list->map;
		if (        (entry->offset >= map->offset
			    && (entry->offset) < (map->offset + map->size) )
			|| ((entry->offset + entry->size) >= map->offset
			    && (entry->offset + entry->size) < (map->offset + map->size) ) 
			|| ((entry->offset < map->offset)
			    && (entry->offset + entry->size) >= (map->offset + map->size) ) )
			DRM_DEBUG("map collission: add(0x%lx-0x%lx), current(0x%lx-0x%lx)\n", 
				entry->offset, entry->offset + entry->size - 1,
				map->offset, map->offset + map->size - 1);
	}

	switch ( map->type ) {
	case _DRM_REGISTERS:
	case _DRM_FRAME_BUFFER:
#if !defined(__sparc__) && !defined(__alpha__)
		if ( map->offset + map->size < map->offset
		) {
			DRM(free)( map, sizeof(*map), DRM_MEM_MAPS );
			DRM_OS_RETURN(EINVAL);
		}
#endif
#ifdef __alpha__
		map->offset += dev->hose->mem_space->start;
#endif
#if __REALLY_HAVE_MTRR
		if ( map->type == _DRM_FRAME_BUFFER ||
		     (map->flags & _DRM_WRITE_COMBINING) ) {
			map->mtrr = mtrr_add( map->offset, map->size,
					      MTRR_TYPE_WRCOMB, 1 );
		}
#endif
		map->handle = DRM(ioremap)( map->offset, map->size );
		break;

	case _DRM_SHM:
		DRM_INFO( "%ld %d %d\n",
			   map->size, DRM(order)( map->size ), PAGE_SHIFT);