mesa-drm/linux-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>
 */

/*
 * To use this template, you must at least define the following (samples
 * given for the MGA driver):
 *
 * #define DRIVER_AUTHOR	"VA Linux Systems, Inc."
 *
 * #define DRIVER_NAME		"mga"
 * #define DRIVER_DESC		"Matrox G200/G400"
 * #define DRIVER_DATE		"20001127"
 *
 * #define DRIVER_MAJOR		2
 * #define DRIVER_MINOR		0
 * #define DRIVER_PATCHLEVEL	2
 *
 * #define DRIVER_IOCTL_COUNT	DRM_ARRAY_SIZE( mga_ioctls )
 *
 * #define DRM(x)		mga_##x
 */

#ifndef __MUST_HAVE_AGP
#define __MUST_HAVE_AGP			0
#endif
#ifndef __HAVE_CTX_BITMAP
#define __HAVE_CTX_BITMAP		0
#endif
#ifndef __HAVE_DMA_IRQ
#define __HAVE_DMA_IRQ			0
#endif
#ifndef __HAVE_DMA_QUEUE
#define __HAVE_DMA_QUEUE		0
#endif
#ifndef __HAVE_MULTIPLE_DMA_QUEUES
#define __HAVE_MULTIPLE_DMA_QUEUES	0
#endif
#ifndef __HAVE_DMA_SCHEDULE
#define __HAVE_DMA_SCHEDULE		0
#endif
#ifndef __HAVE_DMA_FLUSH
#define __HAVE_DMA_FLUSH		0
#endif
#ifndef __HAVE_DMA_READY
#define __HAVE_DMA_READY		0
#endif
#ifndef __HAVE_DMA_QUIESCENT
#define __HAVE_DMA_QUIESCENT		0
#endif
#ifndef __HAVE_RELEASE
#define __HAVE_RELEASE			0
#endif
#ifndef __HAVE_COUNTERS
#define __HAVE_COUNTERS			0
#endif
#ifndef __HAVE_SG
#define __HAVE_SG			0
#endif

#ifndef DRIVER_PREINIT
#define DRIVER_PREINIT()
#endif
#ifndef DRIVER_POSTINIT
#define DRIVER_POSTINIT()
#endif
#ifndef DRIVER_PRERELEASE
#define DRIVER_PRERELEASE()
#endif
#ifndef DRIVER_PRETAKEDOWN
#define DRIVER_PRETAKEDOWN()
#endif
#ifndef DRIVER_IOCTLS
#define DRIVER_IOCTLS
#endif

#ifdef __linux__
static drm_device_t	DRM(device);
static int              DRM(minor);

static struct file_operations	DRM(fops) = {
#if LINUX_VERSION_CODE >= 0x020400
				/* This started being used during 2.4.0-test */
	owner:   THIS_MODULE,
#endif
	open:	 DRM(open),
	flush:	 DRM(flush),
	release: DRM(release),
	ioctl:	 DRM(ioctl),
	mmap:	 DRM(mmap),
	read:	 DRM(read),
	fasync:	 DRM(fasync),
	poll:	 DRM(poll),
};
#endif

#ifdef __FreeBSD__
#if DRM_LINUX
#include <sys/file.h>
#include <sys/proc.h>
#include <machine/../linux/linux.h>
#include <machine/../linux/linux_proto.h>
#include <compat/linux/linux_ioctl.h>
#include <dev/drm/drm_linux.h>
#endif

static int DRM(init)(device_t nbdev);
static void DRM(cleanup)(device_t nbdev);

#define CDEV_MAJOR	145
#define DRIVER_SOFTC(unit) \
	((drm_device_t *) devclass_get_softc(DRM(devclass), unit))

#if __REALLY_HAVE_AGP
MODULE_DEPEND(DRIVER_NAME, agp, 1, 1, 1);
#endif

#if DRM_LINUX
MODULE_DEPEND(DRIVER_NAME, linux, 1, 1, 1);
#endif
#endif

static drm_ioctl_desc_t		  DRM(ioctls)[] = {
	[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_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_UNIQUE)]    = { DRM(setunique),   1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_BLOCK)]         = { DRM(block),       1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_UNBLOCK)]       = { DRM(unblock),     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(finish),      1, 0 },

#if __HAVE_DMA
	[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 },

	/* The DRM_IOCTL_DMA ioctl should be defined by the driver.
	 */
#if __HAVE_DMA_IRQ
	[DRM_IOCTL_NR(DRM_IOCTL_CONTROL)]       = { DRM(control),     1, 1 },
#endif
#endif

#if __REALLY_HAVE_AGP
	[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 },
#endif

#if __HAVE_SG
	[DRM_IOCTL_NR(DRM_IOCTL_SG_ALLOC)]      = { DRM(sg_alloc),    1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_SG_FREE)]       = { DRM(sg_free),     1, 1 },
#endif

	DRIVER_IOCTLS
};

#define DRIVER_IOCTL_COUNT	DRM_ARRAY_SIZE( DRM(ioctls) )

#ifdef __linux__
#ifdef MODULE
static char *drm_opts = NULL;
#endif

MODULE_AUTHOR( DRIVER_AUTHOR );
MODULE_DESCRIPTION( DRIVER_DESC );
MODULE_PARM( drm_opts, "s" );

#ifndef MODULE
/* DRM(options) is called by the kernel to parse command-line options
 * passed via the boot-loader (e.g., LILO).  It calls the insmod option
 * routine, drm_parse_drm.
 */

static int __init DRM(options)( char *str )
{
	DRM(parse_options)( str );
	return 1;
}

__setup( DRIVER_NAME "=", DRM(options) );
#endif
#endif

#ifdef __FreeBSD__
static int DRM(attach)(device_t dev)
{
	return DRM(init)(dev);
}

static int DRM(detach)(device_t dev)
{
	DRM(cleanup)(dev);
	return 0;
}

static device_method_t DRM(methods)[] = {
	/* Device interface */
	DEVMETHOD(device_probe,		DRM( probe)),
	DEVMETHOD(device_attach,	DRM( attach)),
	DEVMETHOD(device_detach,	DRM( detach)),

	{ 0, 0 }
};

static driver_t DRM(driver) = {
	"drm",
	DRM(methods),
	sizeof(drm_device_t),
};

static devclass_t DRM( devclass);

static struct cdevsw DRM( cdevsw) = {
	/* open */	DRM( open ),
	/* close */	DRM( close ),
	/* read */	DRM( read ),
	/* write */	DRM( write ),
	/* ioctl */	DRM( ioctl ),
	/* poll */	DRM( poll ),
	/* mmap */	DRM( mmap ),
	/* strategy */	nostrategy,
	/* name */	DRIVER_NAME,
	/* maj */	CDEV_MAJOR,
	/* dump */	nodump,
	/* psize */	nopsize,
	/* flags */	D_TTY | D_TRACKCLOSE,
	/* bmaj */	-1
};
#endif

static int DRM(setup)( drm_device_t *dev )
{
	int i;

	atomic_set( &dev->ioctl_count, 0 );
	atomic_set( &dev->vma_count, 0 );
	dev->buf_use = 0;
	atomic_set( &dev->buf_alloc, 0 );

#if __HAVE_DMA
	i = DRM(dma_setup)( dev );
	if ( i < 0 )
		return i;
#endif

	dev->counters  = 6 + __HAVE_COUNTERS;
	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;
#ifdef __HAVE_COUNTER6
	dev->types[6]  = __HAVE_COUNTER6;
#endif
#ifdef __HAVE_COUNTER7
	dev->types[7]  = __HAVE_COUNTER7;
#endif
#ifdef __HAVE_COUNTER8
	dev->types[8]  = __HAVE_COUNTER8;
#endif
#ifdef __HAVE_COUNTER9
	dev->types[9]  = __HAVE_COUNTER9;
#endif
#ifdef __HAVE_COUNTER10
	dev->types[10] = __HAVE_COUNTER10;
#endif
#ifdef __HAVE_COUNTER11
	dev->types[11] = __HAVE_COUNTER11;
#endif
#ifdef __HAVE_COUNTER12
	dev->types[12] = __HAVE_COUNTER12;
#endif
#ifdef __HAVE_COUNTER13
	dev->types[13] = __HAVE_COUNTER13;
#endif
#ifdef __HAVE_COUNTER14
	dev->types[14] = __HAVE_COUNTER14;
#endif
#ifdef __HAVE_COUNTER15
	dev->types[14] = __HAVE_COUNTER14;
#endif

	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->maplist = DRM(alloc)(sizeof(*dev->maplist),
				  DRM_MEM_MAPS);
	if(dev->maplist == NULL) DRM_OS_RETURN(ENOMEM);
	memset(dev->maplist, 0, sizeof(*dev->maplist));
#ifdef __linux__
	INIT_LIST_HEAD(&dev->maplist->head);
#endif
#ifdef __FreeBSD__
	TAILQ_INIT(dev->maplist);
#endif
	dev->map_count = 0;

	dev->vmalist = NULL;
	dev->lock.hw_lock = NULL;
#ifdef __linux__
	init_waitqueue_head( &dev->lock.lock_queue );
#endif
#ifdef __FreeBSD__
	dev->lock.lock_queue = 0;
#endif
	dev->queue_count = 0;
	dev->queue_reserved = 0;
	dev->queue_slots = 0;
	dev->queuelist = NULL;
	dev->irq = 0;
	dev->context_flag = 0;
	dev->interrupt_flag = 0;
	dev->dma_flag = 0;
	dev->last_context = 0;
	dev->last_switch = 0;
	dev->last_checked = 0;
#ifdef __linux__
	init_timer( &dev->timer );
	init_waitqueue_head( &dev->context_wait );
#endif
#ifdef __FreeBSD__
	callout_init( &dev->timer );
	dev->context_wait = 0;
#endif

	dev->ctx_start = 0;
	dev->lck_start = 0;

	dev->buf_rp = dev->buf;
	dev->buf_wp = dev->buf;
	dev->buf_end = dev->buf + DRM_BSZ;
#ifdef __linux__
	dev->buf_async = NULL;
	init_waitqueue_head( &dev->buf_readers );
	init_waitqueue_head( &dev->buf_writers );
#endif
#ifdef __FreeBSD__
	dev->buf_sigio = NULL;
	dev->buf_readers = 0;
	dev->buf_writers = 0;
	dev->buf_selecting = 0;
#endif

	DRM_DEBUG( "\n" );

	/* The kernel's context could be created here, but is now created
	 * in drm_dma_enqueue.	This is more resource-efficient for
	 * hardware that does not do DMA, but may mean that
	 * drm_select_queue fails between the time the interrupt is
	 * initialized and the time the queues are initialized.
	 */
	return 0;
}


static int DRM(takedown)( drm_device_t *dev )
{
	drm_magic_entry_t *pt, *next;
	drm_map_t *map;
#ifdef __linux__
	drm_map_list_t *r_list;
	struct list_head *list;
#endif
#ifdef __FreeBSD__
	drm_map_list_entry_t *list;
#endif
	drm_vma_entry_t *vma, *vma_next;
	int i;

	DRM_DEBUG( "\n" );

	DRIVER_PRETAKEDOWN();
#if __HAVE_DMA_IRQ
	if ( dev->irq ) DRM(irq_uninstall)( dev );
#endif

	DRM_OS_LOCK;
#ifdef __linux__
	del_timer( &dev->timer );
#endif
#ifdef __FreeBSD__
	callout_stop( &dev->timer );
#endif

	if ( dev->devname ) {
		DRM(free)( dev->devname, strlen( dev->devname ) + 1,
			   DRM_MEM_DRIVER );
		dev->devname = NULL;
	}

	if ( dev->unique ) {
		DRM(free)( dev->unique, strlen( dev->unique ) + 1,
			   DRM_MEM_DRIVER );
		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;
			DRM(free)( pt, sizeof(*pt), DRM_MEM_MAGIC );
		}
		dev->magiclist[i].head = dev->magiclist[i].tail = NULL;
	}

#if __REALLY_HAVE_AGP
				/* 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 drv_cleanup is called. */
		for ( entry = dev->agp->memory ; entry ; entry = nexte ) {
			nexte = entry->next;
#ifdef __linux__
			if ( entry->bound ) DRM(unbind_agp)( entry->memory );
			DRM(free_agp)( entry->memory, entry->pages );
#endif
#ifdef __FreeBSD__
			if ( entry->bound ) DRM(unbind_agp)( entry->handle );
			DRM(free_agp)( entry->handle, entry->pages );
#endif
			DRM(free)( entry, sizeof(*entry), DRM_MEM_AGPLISTS );
		}
		dev->agp->memory = NULL;

		if ( dev->agp->acquired ) DRM(agp_do_release)();

		dev->agp->acquired = 0;
		dev->agp->enabled  = 0;
	}
#endif

				/* Clear vma list (only built for debugging) */
	if ( dev->vmalist ) {
		for ( vma = dev->vmalist ; vma ; vma = vma_next ) {
			vma_next = vma->next;
			DRM(free)( vma, sizeof(*vma), DRM_MEM_VMAS );
		}
		dev->vmalist = NULL;
	}

	if( dev->maplist ) {
#ifdef __linux__
		list_for_each(list, &dev->maplist->head) {
			r_list = (drm_map_list_t *)list;
			map = r_list->map;
			DRM(free)(r_list, sizeof(*r_list), DRM_MEM_MAPS);
			if(!map) continue;
#endif
#ifdef __FreeBSD__
		while ((list=TAILQ_FIRST(dev->maplist))) {
			map = list->map;
#endif
			switch ( map->type ) {
			case _DRM_REGISTERS:
			case _DRM_FRAME_BUFFER:
#if __REALLY_HAVE_MTRR
				if ( map->mtrr >= 0 ) {
					int retcode;
					retcode = mtrr_del( map->mtrr,
							    map->offset,
							    map->size );
					DRM_DEBUG( "mtrr_del=%d\n", retcode );
				}
#endif
				DRM(ioremapfree)( map->handle, map->size );
				break;
			case _DRM_SHM:
#ifdef __linux__
				vfree(map->handle);
#endif
#ifdef __FreeBSD__
				DRM(free_pages)((unsigned long)map->handle,
					       DRM(order)(map->size)
					       - PAGE_SHIFT,
					       DRM_MEM_SAREA);
#endif
				break;

			case _DRM_AGP:
				/* Do nothing here, because this is all
				 * handled in the AGP/GART driver.
				 */
				break;
                       case _DRM_SCATTER_GATHER:
				/* Handle it, but do nothing, if HAVE_SG
				 * isn't defined.
				 */
#if __HAVE_SG
				if(dev->sg) {
					DRM(sg_cleanup)(dev->sg);
					dev->sg = NULL;
				}
#endif
				break;
			}
#ifdef __FreeBSD__
			TAILQ_REMOVE(dev->maplist, list, link);
			DRM(free)(list, sizeof(*list), DRM_MEM_MAPS);
#endif
			DRM(free)(map, sizeof(*map), DRM_MEM_MAPS);
		}
		DRM(free)(dev->maplist, sizeof(*dev->maplist), DRM_MEM_MAPS);
		dev->maplist   = NULL;
 	}

#if __HAVE_DMA_QUEUE || __HAVE_MULTIPLE_DMA_QUEUES
	if ( dev->queuelist ) {
		for ( i = 0 ; i < dev->queue_count ; i++ ) {
			DRM(waitlist_destroy)( &dev->queuelist[i]->waitlist );
			if ( dev->queuelist[i] ) {
				DRM(free)( dev->queuelist[i],
					  sizeof(*dev->queuelist[0]),
					  DRM_MEM_QUEUES );
				dev->queuelist[i] = NULL;
			}
		}
		DRM(free)( dev->queuelist,
			  dev->queue_slots * sizeof(*dev->queuelist),
			  DRM_MEM_QUEUES );
		dev->queuelist = NULL;
	}
	dev->queue_count = 0;
#endif

#if __HAVE_DMA
	DRM(dma_takedown)( dev );
#endif
	if ( dev->lock.hw_lock ) {
		dev->lock.hw_lock = NULL; /* SHM removed */
		dev->lock.pid = 0;
#ifdef __linux__
		wake_up_interruptible( &dev->lock.lock_queue );
#endif
#ifdef __FreeBSD__
		wakeup( &dev->lock.lock_queue );
#endif
	}
	DRM_OS_UNLOCK;

	return 0;
}

/* drm_init is called via init_module at module load time, or via
 * linux/init/main.c (this is not currently supported).
 */
#ifdef __linux__
static int __init drm_init( void )
{
	drm_device_t *dev = &DRM(device);
#endif
#ifdef __FreeBSD__
static int DRM(init)( device_t nbdev )
{
	drm_device_t *dev = device_get_softc(nbdev);
#endif
#if __HAVE_CTX_BITMAP
	int retcode;
#endif
	DRM_DEBUG( "\n" );

	memset( (void *)dev, 0, sizeof(*dev) );
#ifdef __linux__
	dev->count_lock = SPIN_LOCK_UNLOCKED;
	sema_init( &dev->struct_sem, 1 );
#ifdef MODULE
	DRM(parse_options)( drm_opts );
#endif
#endif
#ifdef __FreeBSD__
	simple_lock_init(&dev->count_lock);
	lockinit(&dev->dev_lock, PZERO, "drmlk", 0, 0);
#endif

	DRIVER_PREINIT();

#ifdef __linux__
	DRM(mem_init)();

	if ((DRM(minor) = DRM(stub_register)(DRIVER_NAME, &DRM(fops),dev)) < 0)
		DRM_OS_RETURN(EPERM);
	dev->device = MKDEV(DRM_MAJOR, DRM(minor) );
	dev->name   = DRIVER_NAME;
#endif
#ifdef __FreeBSD__
	dev->device = nbdev;
	dev->devnode = make_dev(&DRM( cdevsw),
				device_get_unit(nbdev),
				DRM_DEV_UID,
				DRM_DEV_GID,
				DRM_DEV_MODE,
				"dri/card0");
	dev->name   = DRIVER_NAME;
	DRM(mem_init)();
	DRM(sysctl_init)(dev);
	TAILQ_INIT(&dev->files);
#endif

#if __REALLY_HAVE_AGP
	dev->agp = DRM(agp_init)();
#if __MUST_HAVE_AGP
	if ( dev->agp == NULL ) {
		DRM_ERROR( "Cannot initialize the agpgart module.\n" );
#ifdef __linux__
		DRM(stub_unregister)(DRM(minor));
#endif
#ifdef __FreeBSD__
		DRM(sysctl_cleanup)();
		destroy_dev(dev->devnode);
#endif
		DRM(takedown)( dev );
		DRM_OS_RETURN(ENOMEM);
	}
#endif
#if __REALLY_HAVE_MTRR
	if (dev->agp)
		dev->agp->agp_mtrr = mtrr_add( dev->agp->agp_info.aper_base,
				       dev->agp->agp_info.aper_size*1024*1024,
				       MTRR_TYPE_WRCOMB,
				       1 );
#endif
#endif

#if __HAVE_CTX_BITMAP
	retcode = DRM(ctxbitmap_init)( dev );
	if( retcode ) {
		DRM_ERROR( "Cannot allocate memory for context bitmap.\n" );
#ifdef __linux__
		DRM(stub_unregister)(DRM(minor));
#endif
#ifdef __FreeBSD__
		DRM(sysctl_cleanup)( dev );
		destroy_dev(dev->devnode);
#endif
		DRM(takedown)( dev );
		return retcode;
	}
#endif

	DRIVER_POSTINIT();

#ifdef __linux__
	DRM_INFO( "Initialized %s %d.%d.%d %s on minor %d\n",
		  DRIVER_NAME,
		  DRIVER_MAJOR,
		  DRIVER_MINOR,
		  DRIVER_PATCHLEVEL,
		  DRIVER_DATE,
		  DRM(minor) );
#endif
#ifdef __FreeBSD__
	DRM_INFO( "Initialized %s %d.%d.%d %s on minor %d\n",
		  DRIVER_NAME,
		  DRIVER_MAJOR,
		  DRIVER_MINOR,
		  DRIVER_PATCHLEVEL,
		  DRIVER_DATE,
		  device_get_unit(nbdev) );
#endif

	return 0;
}

/* drm_cleanup is called via cleanup_module at module unload time.
 */
#ifdef __linux__
static void __exit drm_cleanup( void )
{
	drm_device_t *dev = &DRM(device);
#endif
#ifdef __FreeBSD__
static void DRM(cleanup)(device_t nbdev)
{
	drm_device_t *dev = device_get_softc(nbdev);
#endif
	DRM_DEBUG( "\n" );

#ifdef __linux__
	if ( DRM(stub_unregister)(DRM(minor)) ) {
		DRM_ERROR( "Cannot unload module\n" );
	} else {
		DRM_INFO( "Module unloaded\n" );
	}
#endif
#ifdef __FreeBSD__
	DRM(sysctl_cleanup)( dev );
	destroy_dev(dev->devnode);
#endif

#if __HAVE_CTX_BITMAP
	DRM(ctxbitmap_cleanup)( dev );
#endif

#if __REALLY_HAVE_AGP && __REALLY_HAVE_MTRR
	if ( dev->agp && dev->agp->agp_mtrr ) {
		int retval;
		retval = mtrr_del( dev->agp->agp_mtrr,
				   dev->agp->agp_info.aper_base,
				   dev->agp->agp_info.aper_size*1024*1024 );
		DRM_DEBUG( "mtrr_del=%d\n", retval );
	}
#endif

	DRM(takedown)( dev );

#if __REALLY_HAVE_AGP
	if ( dev->agp ) {
		DRM(agp_uninit)();
		DRM(free)( dev->agp, sizeof(*dev->agp), DRM_MEM_AGPLISTS );
		dev->agp = NULL;
	}
#endif
}

#ifdef __linux__
module_init( drm_init );
module_exit( drm_cleanup );
#endif

int DRM(version)( DRM_OS_IOCTL )
{
	drm_version_t version;
	int len;

	DRM_OS_KRNFROMUSR( 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_OS_COPYTOUSR( name, value, len ) )		\
			DRM_OS_RETURN(EFAULT);				\
	}

	version.version_major = DRIVER_MAJOR;
	version.version_minor = DRIVER_MINOR;
	version.version_patchlevel = DRIVER_PATCHLEVEL;

	DRM_COPY( version.name, DRIVER_NAME );
	DRM_COPY( version.date, DRIVER_DATE );
	DRM_COPY( version.desc, DRIVER_DESC );

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

	return 0;
}

#ifdef __linux__
int DRM(open)( struct inode *inode, struct file *filp )
{
	drm_device_t *dev = &DRM(device);
#endif
#ifdef __FreeBSD__
int DRM( open)(dev_t kdev, int flags, int fmt, struct proc *p)
{
	drm_device_t  *dev    = DRIVER_SOFTC(minor(kdev));
#endif
	int retcode = 0;

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

#ifdef __linux__
	retcode = DRM(open_helper)( inode, filp, dev );
#endif
#ifdef __FreeBSD__
	device_busy(dev->device);
	retcode = DRM(open_helper)(kdev, flags, fmt, p, dev);
#endif

	if ( !retcode ) {
#ifdef __linux__
#if LINUX_VERSION_CODE < 0x020333
		MOD_INC_USE_COUNT; /* Needed before Linux 2.3.51 */
#endif
#endif
		atomic_inc( &dev->counts[_DRM_STAT_OPENS] );
		DRM_OS_SPINLOCK( &dev->count_lock );
		if ( !dev->open_count++ ) {
			DRM_OS_SPINUNLOCK( &dev->count_lock );
			return DRM(setup)( dev );
		}
		DRM_OS_SPINUNLOCK( &dev->count_lock );
	}
#ifdef __FreeBSD__
	device_unbusy(dev->device);
#endif

	return retcode;
}

#ifdef __linux__
int DRM(release)( struct inode *inode, struct file *filp )
{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev;
#endif
#ifdef __FreeBSD__
int DRM( close)(dev_t kdev, int flags, int fmt, struct proc *p)
{
	drm_file_t *priv;
	drm_device_t  *dev    = kdev->si_drv1;
#endif
	int retcode = 0;

#ifdef __linux__
	lock_kernel();
	dev = priv->dev;
#endif
	DRM_DEBUG( "open_count = %d\n", dev->open_count );
#ifdef __FreeBSD__
	priv = DRM(find_file_by_proc)(dev, p);
	if (!priv) {
		DRM_DEBUG("can't find authenticator\n");
		return EINVAL;
	}
#endif

	DRIVER_PRERELEASE();

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

	DRM_DEBUG( "pid = %d, device = 0x%x, open_count = %d\n",
		   DRM_OS_CURRENTPID, dev->device, dev->open_count );

	if (dev->lock.hw_lock && _DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)
	    && dev->lock.pid == DRM_OS_CURRENTPID) {
		DRM_DEBUG("Process %d dead, freeing lock for context %d\n",
			  DRM_OS_CURRENTPID,
			  _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
#if HAVE_DRIVER_RELEASE
		DRIVER_RELEASE();
#endif
		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. */
	}
#if __HAVE_RELEASE
	else if ( dev->lock.hw_lock ) {
		/* The lock is required to reclaim buffers */
#ifdef __linux__
		DECLARE_WAITQUEUE( entry, current );
		add_wait_queue( &dev->lock.lock_queue, &entry );
#endif
		for (;;) {
#ifdef __linux__
			current->state = TASK_INTERRUPTIBLE;
#endif
			if ( !dev->lock.hw_lock ) {
				/* Device has been unregistered */
				retcode = -EINTR;
				break;
			}
			if ( DRM(lock_take)( &dev->lock.hw_lock->lock,
					     DRM_KERNEL_CONTEXT ) ) {
#ifdef __linux__
				dev->lock.pid	    = priv->pid;
				dev->lock.lock_time = jiffies;
#endif
#ifdef __FreeBSD__
				dev->lock.pid       = p->p_pid;
				dev->lock.lock_time = ticks;
#endif
                                atomic_inc( &dev->counts[_DRM_STAT_LOCKS] );
				break;	/* Got lock */
			}
				/* Contention */
#if 0
			atomic_inc( &dev->total_sleeps );
#endif
#ifdef __linux__
			schedule();
			if ( signal_pending( current ) ) {
				retcode = -ERESTARTSYS;
				break;
			}
#endif
#ifdef __FreeBSD__
			retcode = tsleep(&dev->lock.lock_queue,
					PZERO|PCATCH,
					"drmlk2",
					0);
			if (retcode)
				break;
#endif
		}
#ifdef __linux__
		current->state = TASK_RUNNING;
		remove_wait_queue( &dev->lock.lock_queue, &entry );
#endif
		if( !retcode ) {
			DRIVER_RELEASE();
			DRM(lock_free)( dev, &dev->lock.hw_lock->lock,
					DRM_KERNEL_CONTEXT );
		}
	}
#elif __HAVE_DMA
	DRM(reclaim_buffers)( dev, priv->pid );
#endif

#ifdef __linux__
	DRM(fasync)( -1, filp, 0 );
#endif
#ifdef __FreeBSD__
	funsetown(dev->buf_sigio);
#endif

	DRM_OS_LOCK;
#ifdef __linux__
	if ( priv->remove_auth_on_close == 1 ) {
		drm_file_t *temp = dev->file_first;
		while ( temp ) {
			temp->authenticated = 0;
			temp = temp->next;
		}
	}
	if ( priv->prev ) {
		priv->prev->next = priv->next;
	} else {
		dev->file_first	 = priv->next;
	}
	if ( priv->next ) {
		priv->next->prev = priv->prev;
	} else {
		dev->file_last	 = priv->prev;
	}
#endif
#ifdef __FreeBSD__
	priv = DRM(find_file_by_proc)(dev, p);
	if (priv) {
		priv->refs--;
		if (!priv->refs) {
			TAILQ_REMOVE(&dev->files, priv, link);
		}
	}
#endif
	DRM_OS_UNLOCK;

	DRM(free)( priv, sizeof(*priv), DRM_MEM_FILES );

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

#ifdef __linux__
#if LINUX_VERSION_CODE < 0x020333
	MOD_DEC_USE_COUNT; /* Needed before Linux 2.3.51 */
#endif
#endif
	atomic_inc( &dev->counts[_DRM_STAT_CLOSES] );
	DRM_OS_SPINLOCK( &dev->count_lock );
	if ( !--dev->open_count ) {
		if ( atomic_read( &dev->ioctl_count ) || dev->blocked ) {
			DRM_ERROR( "Device busy: %d %d\n",
				   atomic_read( &dev->ioctl_count ),
				   dev->blocked );
			DRM_OS_SPINUNLOCK( &dev->count_lock );
#ifdef __linux__
			unlock_kernel();
#endif
			DRM_OS_RETURN(EBUSY);
		}
		DRM_OS_SPINUNLOCK( &dev->count_lock );
#ifdef __linux__
		unlock_kernel();
#endif
#ifdef __FreeBSD__
		device_unbusy(dev->device);
#endif
		return DRM(takedown)( dev );
	}
	DRM_OS_SPINUNLOCK( &dev->count_lock );

#ifdef __linux__
	unlock_kernel();
#endif
	
	DRM_OS_RETURN(retcode);
}

/* DRM(ioctl) is called whenever a process performs an ioctl on /dev/drm.
 */
int DRM(ioctl)( DRM_OS_IOCTL )
{
	DRM_OS_DEVICE;
	drm_ioctl_desc_t *ioctl;
#ifdef __linux__
	drm_ioctl_t *func;
#endif
#ifdef __FreeBSD__
	d_ioctl_t *func;
#endif
	int nr = DRM_IOCTL_NR(cmd);
	int retcode = 0;

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

	DRM_DEBUG( "pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%x, auth=%d\n",
		   current->pid, cmd, nr, dev->device, priv->authenticated );

	if ( nr >= DRIVER_IOCTL_COUNT ) {
		retcode = -EINVAL;
	} else {
		ioctl = &DRM(ioctls)[nr];
		func = ioctl->func;

		if ( !func ) {
			DRM_DEBUG( "no function\n" );
			retcode = -EINVAL;
		} else if ( ( ioctl->root_only && 
#ifdef __linux__
				!capable( CAP_SYS_ADMIN ) )
#endif
#ifdef __FreeBSD__
				suser(p) )
#endif
			 || ( ioctl->auth_needed && !priv->authenticated ) ) {
			retcode = -EACCES;
		} else {
#ifdef __linux__
			retcode = func( inode, filp, cmd, data );
#endif
#ifdef __FreeBSD__
			retcode = func( kdev, cmd, data, flags, p );
#endif
		}
	}

	atomic_dec( &dev->ioctl_count );
	return retcode;
}

int DRM(lock)( DRM_OS_IOCTL )
{
	DRM_OS_DEVICE;
#ifdef __linux__
        DECLARE_WAITQUEUE( entry, current );
#endif
        drm_lock_t lock;
        int ret = 0;
#if __HAVE_MULTIPLE_DMA_QUEUES
	drm_queue_t *q;
#endif
#if __HAVE_DMA_HISTOGRAM
        cycles_t start;

        dev->lck_start = start = get_cycles();
#endif

	DRM_OS_KRNFROMUSR( lock, (drm_lock_t *)data, sizeof(lock) );

        if ( lock.context == DRM_KERNEL_CONTEXT ) {
                DRM_ERROR( "Process %d using kernel context %d\n",
			   DRM_OS_CURRENTPID, lock.context );
                DRM_OS_RETURN(EINVAL);
        }

        DRM_DEBUG( "%d (pid %d) requests lock (0x%08x), flags = 0x%08x\n",
		   lock.context, current->pid,
		   dev->lock.hw_lock->lock, lock.flags );

#if __HAVE_DMA_QUEUE
        if ( lock.context < 0 )
                DRM_OS_RETURN(EINVAL);
#elif __HAVE_MULTIPLE_DMA_QUEUES
        if ( lock.context < 0 || lock.context >= dev->queue_count )
                DRM_OS_RETURN(EINVAL);
	q = dev->queuelist[lock.context];
#endif

#if __HAVE_DMA_FLUSH
	ret = DRM(flush_block_and_flush)( dev, lock.context, lock.flags );
#endif
        if ( !ret ) {
#ifdef __linux__
                add_wait_queue( &dev->lock.lock_queue, &entry );
#endif
                for (;;) {
#ifdef __linux__
                        current->state = TASK_INTERRUPTIBLE;
#endif
                        if ( !dev->lock.hw_lock ) {
                                /* Device has been unregistered */
                                ret = -EINTR;
                                break;
                        }
                        if ( DRM(lock_take)( &dev->lock.hw_lock->lock,
					     lock.context ) ) {
                                dev->lock.pid       = DRM_OS_CURRENTPID;
#ifdef __linux__
                                dev->lock.lock_time = jiffies;
#endif
#ifdef __FreeBSD__
				dev->lock.lock_time = ticks;
#endif
                                atomic_inc( &dev->counts[_DRM_STAT_LOCKS] );
                                break;  /* Got lock */
                        }

                                /* Contention */
#ifdef __linux__
                        schedule();
                        if ( signal_pending( current ) ) {
                                ret = -ERESTARTSYS;
                                break;
                        }
#endif
#ifdef __FreeBSD__
			ret = tsleep(&dev->lock.lock_queue,
					PZERO|PCATCH,
					"drmlk2",
					0);
			if (ret)
				break;
#endif
                }
#ifdef __linux__
                current->state = TASK_RUNNING;
                remove_wait_queue( &dev->lock.lock_queue, &entry );
#endif
        }

#if __HAVE_DMA_FLUSH
	DRM(flush_unblock)( dev, lock.context, lock.flags ); /* cleanup phase */
#endif

        if ( !ret ) {
#ifdef __linux__
		sigemptyset( &dev->sigmask );
		sigaddset( &dev->sigmask, SIGSTOP );
		sigaddset( &dev->sigmask, SIGTSTP );
		sigaddset( &dev->sigmask, SIGTTIN );
		sigaddset( &dev->sigmask, SIGTTOU );
		dev->sigdata.context = lock.context;
		dev->sigdata.lock    = dev->lock.hw_lock;
		block_all_signals( DRM(notifier),
				   &dev->sigdata, &dev->sigmask );
#endif

#if __HAVE_DMA_READY
                if ( lock.flags & _DRM_LOCK_READY ) {
			DRIVER_DMA_READY();
		}
#endif
#if __HAVE_DMA_QUIESCENT
                if ( lock.flags & _DRM_LOCK_QUIESCENT ) {
			DRIVER_DMA_QUIESCENT();
		}
#endif
        }

        DRM_DEBUG( "%d %s\n", lock.context, ret ? "interrupted" : "has lock" );

#if __HAVE_DMA_HISTOGRAM
        atomic_inc(&dev->histo.lacq[DRM(histogram_slot)(get_cycles()-start)]);
#endif

	DRM_OS_RETURN(ret);
}


int DRM(unlock)( DRM_OS_IOCTL )
{
	DRM_OS_DEVICE;
	drm_lock_t lock;

	DRM_OS_KRNFROMUSR( lock, (drm_lock_t *)data, sizeof(lock) ) ;

	if ( lock.context == DRM_KERNEL_CONTEXT ) {
		DRM_ERROR( "Process %d using kernel context %d\n",
			   DRM_OS_CURRENTPID, lock.context );
		DRM_OS_RETURN(EINVAL);
	}

	atomic_inc( &dev->counts[_DRM_STAT_UNLOCKS] );

	DRM(lock_transfer)( dev, &dev->lock.hw_lock->lock,
			    DRM_KERNEL_CONTEXT );
#if __HAVE_DMA_SCHEDULE
	DRM(dma_schedule)( dev, 1 );
#endif

	/* FIXME: Do we ever really need to check this???
	 */
	if ( 1 /* !dev->context_flag */ ) {
		if ( DRM(lock_free)( dev, &dev->lock.hw_lock->lock,
				     DRM_KERNEL_CONTEXT ) ) {
			DRM_ERROR( "\n" );
		}
	}

#ifdef __linux__
	unblock_all_signals();
#endif
	return 0;
}

#ifdef __FreeBSD__
#if DRM_LINUX
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));

/*
 * Linux emulation IOCTL
 */
static int
DRM(linux_ioctl)(struct proc* p, struct linux_ioctl_args* args)
{
    struct file		*fp = p->p_fd->fd_ofiles[args->fd];
    u_long		cmd = args->cmd;
    caddr_t             data = (caddr_t) args->arg;
    /*
     * Pass the ioctl off to our standard handler.
     */
    return(fo_ioctl(fp, cmd, data, p));
}
#endif /* DRM_LINUX */
#endif