bsd-core/drm_drv.c

/* drm_drv.h -- Generic driver 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>
 *
 */

#include "drmP.h"
#include "drm.h"

int drm_debug_flag = 0;

static int drm_init(device_t nbdev);
static void drm_cleanup(drm_device_t *dev);

#ifdef __FreeBSD__
#define DRIVER_SOFTC(unit) \
	((drm_device_t *)devclass_get_softc(drm_devclass, unit))

MODULE_VERSION(drm, 1);
MODULE_DEPEND(drm, agp, 1, 1, 1);
MODULE_DEPEND(drm, pci, 1, 1, 1);
#endif /* __FreeBSD__ */

#if defined(__NetBSD__) || defined(__OpenBSD__)
#define DRIVER_SOFTC(unit) \
	((drm_device_t *)device_lookup(&drm_cd, unit))
#endif /* __NetBSD__ || __OpenBSD__ */

static drm_ioctl_desc_t		  drm_ioctls[256] = {
	[DRM_IOCTL_NR(DRM_IOCTL_VERSION)]       = { drm_version,     0, 0 },
	[DRM_IOCTL_NR(DRM_IOCTL_GET_UNIQUE)]    = { drm_getunique,   0, 0 },
	[DRM_IOCTL_NR(DRM_IOCTL_GET_MAGIC)]     = { drm_getmagic,    0, 0 },
	[DRM_IOCTL_NR(DRM_IOCTL_IRQ_BUSID)]     = { drm_irq_by_busid, 0, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_GET_MAP)]       = { drm_getmap,      0, 0 },
	[DRM_IOCTL_NR(DRM_IOCTL_GET_CLIENT)]    = { drm_getclient,   0, 0 },
	[DRM_IOCTL_NR(DRM_IOCTL_GET_STATS)]     = { drm_getstats,    0, 0 },
	[DRM_IOCTL_NR(DRM_IOCTL_SET_VERSION)]   = { drm_setversion,  0, 1 },

	[DRM_IOCTL_NR(DRM_IOCTL_SET_UNIQUE)]    = { drm_setunique,   1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_BLOCK)]         = { drm_noop,        1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_UNBLOCK)]       = { drm_noop,        1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_AUTH_MAGIC)]    = { drm_authmagic,   1, 1 },

	[DRM_IOCTL_NR(DRM_IOCTL_ADD_MAP)]       = { drm_addmap,      1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_RM_MAP)]        = { drm_rmmap,       1, 0 },

	[DRM_IOCTL_NR(DRM_IOCTL_SET_SAREA_CTX)] = { drm_setsareactx, 1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_GET_SAREA_CTX)] = { drm_getsareactx, 1, 0 },

	[DRM_IOCTL_NR(DRM_IOCTL_ADD_CTX)]       = { drm_addctx,      1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_RM_CTX)]        = { drm_rmctx,       1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_MOD_CTX)]       = { drm_modctx,      1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_GET_CTX)]       = { drm_getctx,      1, 0 },
	[DRM_IOCTL_NR(DRM_IOCTL_SWITCH_CTX)]    = { drm_switchctx,   1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_NEW_CTX)]       = { drm_newctx,      1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_RES_CTX)]       = { drm_resctx,      1, 0 },

	[DRM_IOCTL_NR(DRM_IOCTL_ADD_DRAW)]      = { drm_adddraw,     1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_RM_DRAW)]       = { drm_rmdraw,      1, 1 },

	[DRM_IOCTL_NR(DRM_IOCTL_LOCK)]	        = { drm_lock,        1, 0 },
	[DRM_IOCTL_NR(DRM_IOCTL_UNLOCK)]        = { drm_unlock,      1, 0 },
	[DRM_IOCTL_NR(DRM_IOCTL_FINISH)]        = { drm_noop,        1, 0 },

	[DRM_IOCTL_NR(DRM_IOCTL_ADD_BUFS)]      = { drm_addbufs,     1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_MARK_BUFS)]     = { drm_markbufs,    1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_INFO_BUFS)]     = { drm_infobufs,    1, 0 },
	[DRM_IOCTL_NR(DRM_IOCTL_MAP_BUFS)]      = { drm_mapbufs,     1, 0 },
	[DRM_IOCTL_NR(DRM_IOCTL_FREE_BUFS)]     = { drm_freebufs,    1, 0 },
	[DRM_IOCTL_NR(DRM_IOCTL_DMA)]           = { drm_dma,         1, 0 },

	[DRM_IOCTL_NR(DRM_IOCTL_CONTROL)]       = { drm_control,     1, 1 },

	[DRM_IOCTL_NR(DRM_IOCTL_AGP_ACQUIRE)]   = { drm_agp_acquire, 1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_AGP_RELEASE)]   = { drm_agp_release, 1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_AGP_ENABLE)]    = { drm_agp_enable,  1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_AGP_INFO)]      = { drm_agp_info,    1, 0 },
	[DRM_IOCTL_NR(DRM_IOCTL_AGP_ALLOC)]     = { drm_agp_alloc,   1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_AGP_FREE)]      = { drm_agp_free,    1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_AGP_BIND)]      = { drm_agp_bind,    1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_AGP_UNBIND)]    = { drm_agp_unbind,  1, 1 },

	[DRM_IOCTL_NR(DRM_IOCTL_SG_ALLOC)]      = { drm_sg_alloc,    1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_SG_FREE)]       = { drm_sg_free,     1, 1 },

	[DRM_IOCTL_NR(DRM_IOCTL_WAIT_VBLANK)]   = { drm_wait_vblank, 0, 0 },
};

const char *drm_find_description(int vendor, int device, drm_pci_id_list_t *idlist);

#ifdef __FreeBSD__
static struct cdevsw drm_cdevsw = {
#if __FreeBSD_version >= 502103
	.d_version =	D_VERSION,
#endif
	.d_open =	drm_open,
	.d_close =	drm_close,
	.d_read =	drm_read,
	.d_ioctl =	drm_ioctl,
	.d_poll =	drm_poll,
	.d_mmap =	drm_mmap,
	.d_name =	"drm",
#if __FreeBSD_version >= 502103
	.d_flags =	D_TRACKCLOSE | D_NEEDGIANT,
#else
	.d_maj =	145,
	.d_flags =	D_TRACKCLOSE,
#endif
#if __FreeBSD_version < 500000
	.d_bmaj =	-1
#endif
};

int drm_probe(device_t dev, drm_pci_id_list_t *idlist)
{
	const char *s = NULL;
	int pciid, vendor, device;

	/* XXX: Cope with agp bridge device? */
	if (!strcmp(device_get_name(dev), "drmsub"))
		pciid = pci_get_devid(device_get_parent(dev));
	else
		pciid = pci_get_devid(dev);

	vendor = (pciid & 0x0000ffff);
	device = (pciid & 0xffff0000) >> 16;
	
	s = drm_find_description(vendor, device, idlist);
	if (s != NULL) {
		device_set_desc(dev, s);
		return 0;
	}

	return ENXIO;
}

int drm_attach(device_t dev, drm_pci_id_list_t *idlist)
{
	return drm_init(dev);
}

int drm_detach(device_t dev)
{
	drm_cleanup(device_get_softc(dev));
	return 0;
}

#ifndef DRM_DEV_NAME
#define DRM_DEV_NAME "drm"
#endif

devclass_t drm_devclass;

#elif defined(__NetBSD__) || defined(__OpenBSD__)

static struct cdevsw drm_cdevsw = {
	drm_open,
	drm_close,
	drm_read,
	nowrite,
	drm_ioctl,
	nostop,
	notty,
	drm_poll,
	drm_mmap,
	nokqfilter,
	D_TTY
};

int drm_refcnt = 0;

#if defined(__NetBSD__) && __NetBSD_Version__ >= 106080000
MOD_DEV("drm", DRIVER_NAME, NULL, -1, &drm_cdevsw, CDEV_MAJOR);
#else
MOD_DEV("drm", LM_DT_CHAR, CDEV_MAJOR, &drm_cdevsw);
#endif

int drm_lkmentry(struct lkm_table *lkmtp, int cmd, int ver);
static int drm_lkmhandle(struct lkm_table *lkmtp, int cmd);

int drm_modprobe();
int drm_probe(struct pci_attach_args *pa);
void drm_attach(struct pci_attach_args *pa, dev_t kdev);

int drm_lkmentry(struct lkm_table *lkmtp, int cmd, int ver) {
	DISPATCH(lkmtp, cmd, ver, drm_lkmhandle, drm_lkmhandle, drm_lkmhandle);
}

static int drm_lkmhandle(struct lkm_table *lkmtp, int cmd)
{
	int j, error = 0;
#if defined(__NetBSD__) && (__NetBSD_Version__ > 106080000)
	struct lkm_dev *args = lkmtp->private.lkm_dev;
#endif

	switch(cmd) {
	case LKM_E_LOAD:
		if (lkmexists(lkmtp))
			return EEXIST;

		if(drm_modprobe())
			return 0;

		return 1;

	case LKM_E_UNLOAD:
		if (drm_refcnt > 0)
			return (EBUSY);
		break;
	case LKM_E_STAT:
		break;

	default:
		error = EIO;
		break;
	}
	
	return error;
}

int drm_modprobe() {
	struct pci_attach_args pa;
	int error;

	error = pci_find_device(&pa, drm_probe, idlist);
	if (error != 0)
		drm_attach(&pa, 0);

	return error;
}

int drm_probe(struct pci_attach_args *pa, drm_pci_id_list_t idlist)
{
	const char *desc;

	desc = drm_find_description(PCI_VENDOR(pa->pa_id),
	    PCI_PRODUCT(pa->pa_id), idlist);
	if (desc != NULL) {
		return 1;
	}

	return 0;
}

void drm_attach(struct pci_attach_args *pa, dev_t kdev, 
    drm_pci_id_list_t *idlist)
{
	int i;
	drm_device_t *dev;

	config_makeroom(kdev, &drm_cd);
	drm_cd.cd_devs[(kdev)] = malloc(sizeof(drm_device_t), M_DRM, M_WAITOK);
	dev = DRIVER_SOFTC(kdev);

	memset(dev, 0, sizeof(drm_device_t));
	memcpy(&dev->pa, pa, sizeof(dev->pa));

	DRM_INFO("%s", drm_find_description(PCI_VENDOR(pa->pa_id), PCI_PRODUCT(pa->pa_id), idlist));
	drm_init(dev);
}

int drm_detach(struct device *self, int flags)
{
	drm_cleanup((drm_device_t *)self);
	return 0;
}

int drm_activate(struct device *self, enum devact act)
{
	switch (act) {
	case DVACT_ACTIVATE:
		return (EOPNOTSUPP);
		break;

	case DVACT_DEACTIVATE:
		/* FIXME */
		break;
	}
	return (0);
}
#endif /* __NetBSD__ || __OpenBSD__ */

const char *drm_find_description(int vendor, int device, drm_pci_id_list_t *idlist) {
	int i = 0;
	
	for (i = 0; idlist[i].vendor != 0; i++) {
		if ((idlist[i].vendor == vendor) &&
		    (idlist[i].device == device)) {
			return idlist[i].name;
		}
	}
	return NULL;
}

/* Initialize the DRM on first open. */
static int drm_setup(drm_device_t *dev)
{
	int i;

	DRM_SPINLOCK_ASSERT(&dev->dev_lock);

	if (dev->presetup)
		dev->presetup(dev);

	dev->buf_use = 0;

	if (dev->use_dma) {
		i = drm_dma_setup(dev);
		if (i != 0)
			return i;
	}

	dev->counters  = 6;
	dev->types[0]  = _DRM_STAT_LOCK;
	dev->types[1]  = _DRM_STAT_OPENS;
	dev->types[2]  = _DRM_STAT_CLOSES;
	dev->types[3]  = _DRM_STAT_IOCTLS;
	dev->types[4]  = _DRM_STAT_LOCKS;
	dev->types[5]  = _DRM_STAT_UNLOCKS;

	for ( i = 0 ; i < DRM_ARRAY_SIZE(dev->counts) ; i++ )
		atomic_set( &dev->counts[i], 0 );

	for ( i = 0 ; i < DRM_HASH_SIZE ; i++ ) {
		dev->magiclist[i].head = NULL;
		dev->magiclist[i].tail = NULL;
	}

	dev->lock.hw_lock = NULL;
	dev->lock.lock_queue = 0;
	dev->irq_enabled = 0;
	dev->context_flag = 0;
	dev->last_context = 0;
	dev->if_version = 0;

#ifdef __FreeBSD__
	dev->buf_sigio = NULL;
#elif defined(__NetBSD__) || defined(__OpenBSD__)
	dev->buf_pgid = 0;
#endif

	DRM_DEBUG( "\n" );

	if (dev->postsetup)
		dev->postsetup(dev);

	return 0;
}

/* Free resources associated with the DRM on the last close. */
static int drm_takedown(drm_device_t *dev)
{
	drm_magic_entry_t *pt, *next;
	drm_local_map_t *map;
	drm_map_list_entry_t *list;
	int i;

	DRM_SPINLOCK_ASSERT(&dev->dev_lock);

	DRM_DEBUG( "\n" );

	if (dev->pretakedown != NULL)
		dev->pretakedown(dev);

	if (dev->irq_enabled)
		drm_irq_uninstall(dev);

	if ( dev->unique ) {
		free(dev->unique, M_DRM);
		dev->unique = NULL;
		dev->unique_len = 0;
	}
				/* Clear pid list */
	for ( i = 0 ; i < DRM_HASH_SIZE ; i++ ) {
		for ( pt = dev->magiclist[i].head ; pt ; pt = next ) {
			next = pt->next;
			free(pt, M_DRM);
		}
		dev->magiclist[i].head = dev->magiclist[i].tail = NULL;
	}

				/* Clear AGP information */
	if ( dev->agp ) {
		drm_agp_mem_t *entry;
		drm_agp_mem_t *nexte;

				/* Remove AGP resources, but leave dev->agp
                                   intact until drm_cleanup is called. */
		for ( entry = dev->agp->memory ; entry ; entry = nexte ) {
			nexte = entry->next;
			if ( entry->bound )
				drm_agp_unbind_memory(entry->handle);
			drm_agp_free_memory(entry->handle);
			free(entry, M_DRM);
		}
		dev->agp->memory = NULL;

		if (dev->agp->acquired)
			drm_agp_do_release();

		dev->agp->acquired = 0;
		dev->agp->enabled  = 0;
	}
	if (dev->sg != NULL) {
		drm_sg_cleanup(dev->sg);
		dev->sg = NULL;
	}

	if (dev->maplist != NULL) {
		while ((list=TAILQ_FIRST(dev->maplist))) {
			map = list->map;
			switch ( map->type ) {
			case _DRM_REGISTERS:
				drm_ioremapfree(map);
				/* FALLTHROUGH */
			case _DRM_FRAME_BUFFER:
				if (map->mtrr) {
					int __unused retcode;

					retcode = drm_mtrr_del(map->offset,
					    map->size, DRM_MTRR_WC);
					DRM_DEBUG("mtrr_del = %d", retcode);
				}
				break;
			case _DRM_SHM:
				free(map->handle, M_DRM);
				break;

			case _DRM_AGP:
			case _DRM_SCATTER_GATHER:
				/* Do nothing here, because this is all
				 * handled in the AGP/GART/SG functions.
				 */
				break;
			}
			TAILQ_REMOVE(dev->maplist, list, link);
			free(list, M_DRM);
			free(map, M_DRM);
		}
 	}

	drm_dma_takedown(dev);
	if ( dev->lock.hw_lock ) {
		dev->lock.hw_lock = NULL; /* SHM removed */
		dev->lock.filp = NULL;
		DRM_WAKEUP_INT((void *)&dev->lock.lock_queue);
	}

	return 0;
}

/* linux: drm_init is called via init_module at module load time, or via
 *        linux/init/main.c (this is not currently supported).
 * bsd:   drm_init is called via the attach function per device.
 */
static int drm_init(device_t nbdev)
{
	int unit;
	drm_device_t *dev;
	int retcode;
	DRM_DEBUG( "\n" );

#ifdef __FreeBSD__
	unit = device_get_unit(nbdev);
	dev = device_get_softc(nbdev);

	if (!strcmp(device_get_name(nbdev), "drmsub"))
		dev->device = device_get_parent(nbdev);
	else
		dev->device = nbdev;

	if (dev->preinit != NULL)
		dev->preinit(dev, 0);

	dev->devnode = make_dev(&drm_cdevsw,
			unit,
			DRM_DEV_UID,
			DRM_DEV_GID,
			DRM_DEV_MODE,
			"dri/card%d", unit);
#if __FreeBSD_version >= 500000
	mtx_init(&dev->dev_lock, "drm device", NULL, MTX_DEF);
#endif
#elif defined(__NetBSD__) || defined(__OpenBSD__)
	dev = nbdev;
	unit = minor(dev->device.dv_unit);

	if (dev->preinit != NULL)
		dev->preinit(dev, 0);
#endif

	dev->irq = pci_get_irq(dev->device);
	/* XXX Fix domain number (alpha hoses) */
	dev->pci_domain = 0;
	dev->pci_bus = pci_get_bus(dev->device);
	dev->pci_slot = pci_get_slot(dev->device);
	dev->pci_func = pci_get_function(dev->device);

	dev->maplist = malloc(sizeof(*dev->maplist), M_DRM, M_WAITOK);
	if (dev->maplist == NULL) {
		retcode = ENOMEM;
		goto error;
	}
	TAILQ_INIT(dev->maplist);

	drm_mem_init();
#ifdef __FreeBSD__
	drm_sysctl_init(dev);
#endif
	TAILQ_INIT(&dev->files);

	if (dev->use_agp) {
		dev->agp = drm_agp_init();
		if (dev->require_agp && dev->agp == NULL) {
			DRM_ERROR("Cannot initialize the agpgart module.\n");
			retcode = DRM_ERR(ENOMEM);
			goto error;
		}
		if (dev->agp != NULL) {
			if (drm_mtrr_add(dev->agp->info.ai_aperture_base,
			    dev->agp->info.ai_aperture_size, DRM_MTRR_WC) == 0)
				dev->agp->mtrr = 1;
		}
	}

	retcode = drm_ctxbitmap_init(dev);
	if (retcode != 0) {
		DRM_ERROR("Cannot allocate memory for context bitmap.\n");
		goto error;
	}
	
	DRM_INFO( "Initialized %s %d.%d.%d %s on minor %d\n",
	  	dev->driver_name,
	  	dev->driver_major,
	  	dev->driver_minor,
	  	dev->driver_patchlevel,
	  	dev->driver_date,
	  	unit );

	if (dev->postinit != NULL)
		dev->postinit(dev, 0);

	return 0;

error:
#ifdef __FreeBSD__
	drm_sysctl_cleanup(dev);
#endif
	DRM_LOCK();
	drm_takedown(dev);
	DRM_UNLOCK();
#ifdef __FreeBSD__
	destroy_dev(dev->devnode);
#if __FreeBSD_version >= 500000
	mtx_destroy(&dev->dev_lock);
#endif
#endif
	free(dev->maplist, M_DRM);
	return retcode;
}

/* linux: drm_cleanup is called via cleanup_module at module unload time.
 * bsd:   drm_cleanup is called per device at module unload time.
 * FIXME: NetBSD
 */
static void drm_cleanup(drm_device_t *dev)
{

	DRM_DEBUG( "\n" );

#ifdef __FreeBSD__
	drm_sysctl_cleanup(dev);
	destroy_dev(dev->devnode);
#endif

	drm_ctxbitmap_cleanup(dev);

	if (dev->agp && dev->agp->mtrr) {
		int __unused retcode;

		retcode = drm_mtrr_del(dev->agp->info.ai_aperture_base,
		    dev->agp->info.ai_aperture_size, DRM_MTRR_WC);
		DRM_DEBUG("mtrr_del = %d", retcode);
	}

	DRM_LOCK();
	drm_takedown(dev);
	DRM_UNLOCK();

	if ( dev->agp ) {
		drm_agp_uninit();
		free(dev->agp, M_DRM);
		dev->agp = NULL;
	}

	if (dev->postcleanup != NULL)
		dev->postcleanup(dev);

	drm_mem_uninit();
#if defined(__FreeBSD__) &&  __FreeBSD_version >= 500000
	mtx_destroy(&dev->dev_lock);
#endif
	free(dev->maplist, M_DRM);
}


int drm_version(DRM_IOCTL_ARGS)
{
	DRM_DEVICE;
	drm_version_t version;
	int len;

	DRM_COPY_FROM_USER_IOCTL( version, (drm_version_t *)data, sizeof(version) );

#define DRM_COPY( name, value )						\
	len = strlen( value );						\
	if ( len > name##_len ) len = name##_len;			\
	name##_len = strlen( value );					\
	if ( len && name ) {						\
		if ( DRM_COPY_TO_USER( name, value, len ) )		\
			return DRM_ERR(EFAULT);				\
	}

	version.version_major = dev->driver_major;
	version.version_minor = dev->driver_minor;
	version.version_patchlevel = dev->driver_patchlevel;

	DRM_COPY(version.name, dev->driver_name);
	DRM_COPY(version.date, dev->driver_date);
	DRM_COPY(version.desc, dev->driver_desc);

	DRM_COPY_TO_USER_IOCTL( (drm_version_t *)data, version, sizeof(version) );

	return 0;
}

int drm_open(struct cdev *kdev, int flags, int fmt, DRM_STRUCTPROC *p)
{
	drm_device_t *dev = NULL;
	int retcode = 0;

	dev = DRIVER_SOFTC(minor(kdev));

	DRM_DEBUG( "open_count = %d\n", dev->open_count );

	retcode = drm_open_helper(kdev, flags, fmt, p, dev);

	if ( !retcode ) {
		atomic_inc( &dev->counts[_DRM_STAT_OPENS] );
		DRM_LOCK();
#ifdef __FreeBSD__
		device_busy(dev->device);
#endif
		if ( !dev->open_count++ )
			retcode = drm_setup(dev);
		DRM_UNLOCK();
	}

	return retcode;
}

int drm_close(struct cdev *kdev, int flags, int fmt, DRM_STRUCTPROC *p)
{
	drm_file_t *priv;
	DRM_DEVICE;
	int retcode = 0;
	DRMFILE filp = (void *)(uintptr_t)(DRM_CURRENTPID);
	
	DRM_DEBUG( "open_count = %d\n", dev->open_count );

	DRM_LOCK();

	priv = drm_find_file_by_proc(dev, p);
	if (!priv) {
		DRM_UNLOCK();
		DRM_ERROR("can't find authenticator\n");
		return EINVAL;
	}

	if (dev->prerelease != NULL)
		dev->prerelease(dev, filp);

	/* ========================================================
	 * Begin inline drm_release
	 */

#ifdef __FreeBSD__
	DRM_DEBUG( "pid = %d, device = 0x%lx, open_count = %d\n",
		   DRM_CURRENTPID, (long)dev->device, dev->open_count );
#elif defined(__NetBSD__) || defined(__OpenBSD__)
	DRM_DEBUG( "pid = %d, device = 0x%lx, open_count = %d\n",
		   DRM_CURRENTPID, (long)&dev->device, dev->open_count);
#endif

	if (dev->lock.hw_lock && _DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)
	    && dev->lock.filp == filp) {
		DRM_DEBUG("Process %d dead, freeing lock for context %d\n",
			  DRM_CURRENTPID,
			  _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
		if (dev->release != NULL)
			dev->release(dev, filp);

		drm_lock_free(dev, &dev->lock.hw_lock->lock,
		    _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
		
				/* FIXME: may require heavy-handed reset of
                                   hardware at this point, possibly
                                   processed via a callback to the X
                                   server. */
	} else if (dev->release != NULL && dev->lock.hw_lock != NULL) {
		/* The lock is required to reclaim buffers */
		for (;;) {
			if ( !dev->lock.hw_lock ) {
				/* Device has been unregistered */
				retcode = DRM_ERR(EINTR);
				break;
			}
			if (drm_lock_take(&dev->lock.hw_lock->lock,
			    DRM_KERNEL_CONTEXT)) {
				dev->lock.filp = filp;
				dev->lock.lock_time = jiffies;
                                atomic_inc( &dev->counts[_DRM_STAT_LOCKS] );
				break;	/* Got lock */
			}
				/* Contention */
#if defined(__FreeBSD__) && __FreeBSD_version > 500000
			retcode = msleep((void *)&dev->lock.lock_queue,
			    &dev->dev_lock, PZERO | PCATCH, "drmlk2", 0);
#else
			retcode = tsleep((void *)&dev->lock.lock_queue,
			    PZERO | PCATCH, "drmlk2", 0);
#endif
			if (retcode)
				break;
		}
		if (retcode == 0) {
			dev->release(dev, filp);
			drm_lock_free(dev, &dev->lock.hw_lock->lock,
			    DRM_KERNEL_CONTEXT);
		}
	}

	if (dev->use_dma)
		drm_reclaim_buffers(dev, (void *)(uintptr_t)priv->pid);

#if defined (__FreeBSD__) && (__FreeBSD_version >= 500000)
	funsetown(&dev->buf_sigio);
#elif defined(__FreeBSD__)
	funsetown(dev->buf_sigio);
#elif defined(__NetBSD__) || defined(__OpenBSD__)
	dev->buf_pgid = 0;
#endif /* __NetBSD__  || __OpenBSD__ */

	if (--priv->refs == 0) {
		TAILQ_REMOVE(&dev->files, priv, link);
		free(priv, M_DRM);
	}

	/* ========================================================
	 * End inline drm_release
	 */

	atomic_inc( &dev->counts[_DRM_STAT_CLOSES] );
#ifdef __FreeBSD__
	device_unbusy(dev->device);
#endif
	if (--dev->open_count == 0) {
		retcode = drm_takedown(dev);
	}

	DRM_UNLOCK();
	
	return retcode;
}

/* drm_ioctl is called whenever a process performs an ioctl on /dev/drm.
 */
int drm_ioctl(struct cdev *kdev, u_long cmd, caddr_t data, int flags, 
    DRM_STRUCTPROC *p)
{
	DRM_DEVICE;
	int retcode = 0;
	drm_ioctl_desc_t *ioctl;
	int (*func)(DRM_IOCTL_ARGS);
	int nr = DRM_IOCTL_NR(cmd);
	drm_file_t *priv;

	DRM_GET_PRIV_WITH_RETURN(priv, (DRMFILE)(uintptr_t)DRM_CURRENTPID);

	atomic_inc( &dev->counts[_DRM_STAT_IOCTLS] );
	++priv->ioctl_count;

#ifdef __FreeBSD__
	DRM_DEBUG( "pid=%d, cmd=0x%02lx, nr=0x%02x, dev 0x%lx, auth=%d\n",
		 DRM_CURRENTPID, cmd, nr, (long)dev->device, priv->authenticated );
#elif defined(__NetBSD__) || defined(__OpenBSD__)
	DRM_DEBUG( "pid=%d, cmd=0x%02lx, nr=0x%02x, dev 0x%lx, auth=%d\n",
		 DRM_CURRENTPID, cmd, nr, (long)&dev->device, priv->authenticated );
#endif

	switch (cmd) {
	case FIONBIO:
	case FIOASYNC:
		return 0;

#ifdef __FreeBSD__
	case FIOSETOWN:
		return fsetown(*(int *)data, &dev->buf_sigio);

	case FIOGETOWN:
#if (__FreeBSD_version >= 500000)
		*(int *) data = fgetown(&dev->buf_sigio);
#else
		*(int *) data = fgetown(dev->buf_sigio);
#endif
		return 0;
#endif /* __FreeBSD__ */
#if defined(__NetBSD__) || defined(__OpenBSD__)
	case TIOCSPGRP:
		dev->buf_pgid = *(int *)data;
		return 0;

	case TIOCGPGRP:
		*(int *)data = dev->buf_pgid;
		return 0;
#endif /* __NetBSD__ */
	}

	if (IOCGROUP(cmd) != DRM_IOCTL_BASE) {
		DRM_DEBUG("Bad ioctl group 0x%x\n", (int)IOCGROUP(cmd));
		return EINVAL;
	}

	ioctl = &drm_ioctls[nr];
	/* It's not a core DRM ioctl, try driver-specific. */
	if (ioctl->func == NULL && nr >= DRM_COMMAND_BASE) {
		/* The array entries begin at DRM_COMMAND_BASE ioctl nr */
		nr -= DRM_COMMAND_BASE;
		if (nr > dev->max_driver_ioctl) {
			DRM_DEBUG("Bad driver ioctl number, 0x%x (of 0x%x)\n",
			    nr, dev->max_driver_ioctl);
			return EINVAL;
		}
		ioctl = &dev->driver_ioctls[nr];
	}
	func = ioctl->func;

	if (func == NULL) {
		DRM_DEBUG( "no function\n" );
		return EINVAL;
	}
	if ((ioctl->root_only && DRM_SUSER(p)) || (ioctl->auth_needed &&
	    !priv->authenticated))
		return EACCES;

	retcode = func(kdev, cmd, data, flags, p, (void *)(uintptr_t)DRM_CURRENTPID);

	if (retcode != 0)
		DRM_DEBUG("    returning %d\n", retcode);

	return DRM_ERR(retcode);
}


#if DRM_LINUX

#include <sys/sysproto.h>

MODULE_DEPEND(DRIVER_NAME, linux, 1, 1, 1);

#define LINUX_IOCTL_DRM_MIN		0x6400
#define LINUX_IOCTL_DRM_MAX		0x64ff

static linux_ioctl_function_t drm_linux_ioctl;
static struct linux_ioctl_handler drm_handler = {drm_linux_ioctl, 
    LINUX_IOCTL_DRM_MIN, LINUX_IOCTL_DRM_MAX};

SYSINIT(drm_register, SI_SUB_KLD, SI_ORDER_MIDDLE, 
    linux_ioctl_register_handler, &drm_handler);
SYSUNINIT(drm_unregister, SI_SUB_KLD, SI_ORDER_MIDDLE, 
    linux_ioctl_unregister_handler, &drm_handler);

/* The bits for in/out are switched on Linux */
#define LINUX_IOC_IN	IOC_OUT
#define LINUX_IOC_OUT	IOC_IN

static int
drm_linux_ioctl(DRM_STRUCTPROC *p, struct linux_ioctl_args* args)
{
	int error;
	int cmd = args->cmd;

	args->cmd &= ~(LINUX_IOC_IN | LINUX_IOC_OUT);
	if (cmd & LINUX_IOC_IN)
		args->cmd |= IOC_IN;
	if (cmd & LINUX_IOC_OUT)
		args->cmd |= IOC_OUT;
	
	error = ioctl(p, (struct ioctl_args *)args);

	return error;
}
#endif /* DRM_LINUX */