freebsd-skq/sys/dev/drm/drm_vm.h

/*
 * $FreeBSD$
 */

#include <vm/vm.h>
#include <vm/pmap.h>

static int DRM(dma_mmap)(dev_t kdev, vm_offset_t offset, int prot)
{
	drm_device_t	 *dev	 = kdev->si_drv1;
	drm_device_dma_t *dma	 = dev->dma;
	unsigned long	 physical;
	unsigned long	 page;

	if (!dma)		   return -1; /* Error */
	if (!dma->pagelist)	   return -1; /* Nothing allocated */

	page	 = offset >> PAGE_SHIFT;
	physical = dma->pagelist[page];

	DRM_DEBUG("0x%08x (page %lu) => 0x%08lx\n", offset, page, physical);
	return atop(physical);
}

int DRM(mmap)(dev_t kdev, vm_offset_t offset, int prot)
{
	drm_device_t	*dev	= kdev->si_drv1;
	drm_map_t	*map	= NULL;
	drm_map_list_entry_t *listentry=NULL;
	/*drm_file_t *priv;*/

/*	DRM_DEBUG("offset = 0x%x\n", offset);*/

	/*XXX Fixme */
	/*priv = DRM(find_file_by_proc)(dev, p);
	if (!priv) {
		DRM_DEBUG("can't find authenticator\n");
		return EINVAL;
	}

	if (!priv->authenticated) return DRM_OS_ERR(EACCES);*/

	if (dev->dma
	    && offset >= 0
	    && offset < ptoa(dev->dma->page_count))
		return DRM(dma_mmap)(kdev, offset, prot);

				/* A sequential search of a linked list is
				   fine here because: 1) there will only be
				   about 5-10 entries in the list and, 2) a
				   DRI client only has to do this mapping
				   once, so it doesn't have to be optimized
				   for performance, even if the list was a
				   bit longer. */
	TAILQ_FOREACH(listentry, dev->maplist, link) {
		map = listentry->map;
/*		DRM_DEBUG("considering 0x%x..0x%x\n", map->offset, map->offset + map->size - 1);*/
		if (offset >= map->offset
		    && offset < map->offset + map->size) break;
	}
	
	if (!listentry) {
		DRM_DEBUG("can't find map\n");
		return -1;
	}
	if (((map->flags&_DRM_RESTRICTED) && suser(DRM_OS_CURPROC))) {
		DRM_DEBUG("restricted map\n");
		return -1;
	}

	switch (map->type) {
	case _DRM_FRAME_BUFFER:
	case _DRM_REGISTERS:
	case _DRM_AGP:
		return atop(offset);
	case _DRM_SHM:
		return atop(vtophys(offset));
	default:
		return -1;	/* This should never happen. */
	}
	DRM_DEBUG("bailing out\n");
	
	return -1;
}