/* gamma_drv.h -- Private header for 3dlabs GMX 2000 driver -*- linux-c -*- * Created: Mon Jan 4 10:05:05 1999 by faith@precisioninsight.com * * Copyright 1999 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 * PRECISION INSIGHT 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 * */ #ifndef _GAMMA_DRV_H_ #define _GAMMA_DRV_H_ typedef struct drm_gamma_private { drm_gamma_sarea_t *sarea_priv; drm_map_t *sarea; drm_map_t *buffers; drm_map_t *mmio0; drm_map_t *mmio1; drm_map_t *mmio2; drm_map_t *mmio3; int num_rast; } drm_gamma_private_t; /* gamma_dma.c */ extern int gamma_dma_init( struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg ); extern int gamma_dma_copy( struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg ); extern int gamma_do_cleanup_dma( drm_device_t *dev ); extern void gamma_dma_ready(drm_device_t *dev); extern void gamma_dma_quiescent_single(drm_device_t *dev); extern void gamma_dma_quiescent_dual(drm_device_t *dev); /* gamma_dma.c */ extern int gamma_dma_schedule(drm_device_t *dev, int locked); extern int gamma_dma(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg); extern int gamma_find_devices(void); extern int gamma_found(void); /* Gamma-specific code pulled from drm_fops.h: */ extern int DRM(finish)(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg); extern int DRM(flush_unblock)(drm_device_t *dev, int context, drm_lock_flags_t flags); extern int DRM(flush_block_and_flush)(drm_device_t *dev, int context, drm_lock_flags_t flags); /* Gamma-specific code pulled from drm_dma.h: */ extern void DRM(clear_next_buffer)(drm_device_t *dev); extern int DRM(select_queue)(drm_device_t *dev, void (*wrapper)(unsigned long)); extern int DRM(dma_enqueue)(struct file *filp, drm_dma_t *dma); extern int DRM(dma_get_buffers)(struct file *filp, drm_dma_t *dma); /* Gamma-specific code pulled from drm_lists.h (now renamed gamma_lists.h): */ extern int DRM(waitlist_create)(drm_waitlist_t *bl, int count); extern int DRM(waitlist_destroy)(drm_waitlist_t *bl); extern int DRM(waitlist_put)(drm_waitlist_t *bl, drm_buf_t *buf); extern drm_buf_t *DRM(waitlist_get)(drm_waitlist_t *bl); extern int DRM(freelist_create)(drm_freelist_t *bl, int count); extern int DRM(freelist_destroy)(drm_freelist_t *bl); extern int DRM(freelist_put)(drm_device_t *dev, drm_freelist_t *bl, drm_buf_t *buf); extern drm_buf_t *DRM(freelist_get)(drm_freelist_t *bl, int block); #define GLINT_DRI_BUF_COUNT 256 #define GAMMA_OFF(reg) \ ((reg < 0x1000) \ ? reg \ : ((reg < 0x10000) \ ? (reg - 0x1000) \ : ((reg < 0x11000) \ ? (reg - 0x10000) \ : (reg - 0x11000)))) #define GAMMA_BASE(reg) ((unsigned long) \ ((reg < 0x1000) ? dev_priv->mmio0->handle : \ ((reg < 0x10000) ? dev_priv->mmio1->handle : \ ((reg < 0x11000) ? dev_priv->mmio2->handle : \ dev_priv->mmio3->handle)))) #define GAMMA_ADDR(reg) (GAMMA_BASE(reg) + GAMMA_OFF(reg)) #define GAMMA_DEREF(reg) *(__volatile__ int *)GAMMA_ADDR(reg) #define GAMMA_READ(reg) GAMMA_DEREF(reg) #define GAMMA_WRITE(reg,val) do { GAMMA_DEREF(reg) = val; } while (0) #define GAMMA_BROADCASTMASK 0x9378 #define GAMMA_COMMANDINTENABLE 0x0c48 #define GAMMA_DMAADDRESS 0x0028 #define GAMMA_DMACOUNT 0x0030 #define GAMMA_FILTERMODE 0x8c00 #define GAMMA_GCOMMANDINTFLAGS 0x0c50 #define GAMMA_GCOMMANDMODE 0x0c40 #define GAMMA_QUEUED_DMA_MODE 1<<1 #define GAMMA_GCOMMANDSTATUS 0x0c60 #define GAMMA_GDELAYTIMER 0x0c38 #define GAMMA_GDMACONTROL 0x0060 #define GAMMA_USE_AGP 1<<1 #define GAMMA_GINTENABLE 0x0808 #define GAMMA_GINTFLAGS 0x0810 #define GAMMA_INFIFOSPACE 0x0018 #define GAMMA_OUTFIFOWORDS 0x0020 #define GAMMA_OUTPUTFIFO 0x2000 #define GAMMA_SYNC 0x8c40 #define GAMMA_SYNC_TAG 0x0188 #define GAMMA_PAGETABLEADDR 0x0C00 #define GAMMA_PAGETABLELENGTH 0x0C08 #define GAMMA_PASSTHROUGH 0x1FE #define GAMMA_DMAADDRTAG 0x530 #define GAMMA_DMACOUNTTAG 0x531 #define GAMMA_COMMANDINTTAG 0x532 #endif a id='n84' href='#n84'>84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 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/**
 * \file drm_drv.h 
 * Generic driver template
 *
 * \author Rickard E. (Rik) Faith <faith@valinux.com>
 * \author Gareth Hughes <gareth@valinux.com>
 *
 * To use this template, you must at least define the following (samples
 * given for the MGA driver):
 *
 * \code
 * #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
 * \endcode
 */

/*
 * 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.
 */

#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
/* __HAVE_KERNEL_CTX_SWITCH isn't used by any of the drm modules in
 * the DRI cvs tree, but it is required by the kernel tree's sparc
 * driver.
 */
#ifndef __HAVE_KERNEL_CTX_SWITCH
#define __HAVE_KERNEL_CTX_SWITCH	0
#endif
#ifndef __HAVE_DRIVER_FOPS_READ
#define __HAVE_DRIVER_FOPS_READ		0
#endif
#ifndef __HAVE_DRIVER_FOPS_POLL
#define __HAVE_DRIVER_FOPS_POLL		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_POSTCLEANUP
#define DRIVER_POSTCLEANUP()
#endif
#ifndef DRIVER_PRESETUP
#define DRIVER_PRESETUP()
#endif
#ifndef DRIVER_POSTSETUP
#define DRIVER_POSTSETUP()
#endif
#ifndef DRIVER_IOCTLS
#define DRIVER_IOCTLS
#endif
#ifndef DRIVER_FOPS
#define DRIVER_FOPS				\
static struct file_operations	DRM(fops) = {	\
	.owner   = THIS_MODULE,			\
	.open	 = DRM(open),			\
	.flush	 = DRM(flush),			\
	.release = DRM(release),		\
	.ioctl	 = DRM(ioctl),			\
	.mmap	 = DRM(mmap),			\
	.fasync  = DRM(fasync),			\
	.poll	 = DRM(poll),			\
	.read	 = DRM(read),			\
}
#endif

#ifndef MODULE
/** Use an additional macro to avoid preprocessor troubles */
#define DRM_OPTIONS_FUNC DRM(options)
/**
 * Called by the kernel to parse command-line options passed via the
 * boot-loader (e.g., LILO).  It calls the insmod option routine,
 * parse_options().
 */
static int __init DRM(options)( char *str )
{
	DRM(parse_options)( str );
	return 1;
}

__setup( DRIVER_NAME "=", DRM_OPTIONS_FUNC );
#undef DRM_OPTIONS_FUNC
#endif

/**
 * The default number of instances (minor numbers) to initialize.
 */
#ifndef DRIVER_NUM_CARDS
#define DRIVER_NUM_CARDS 1
#endif

static drm_device_t	*DRM(device);
static int		*DRM(minor);
static int		DRM(numdevs) = 0;

DRIVER_FOPS;

/** Ioctl table */
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(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 },

#if __HAVE_CTX_BITMAP
	[DRM_IOCTL_NR(DRM_IOCTL_SET_SAREA_CTX)] = { DRM(setsareactx), 1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_GET_SAREA_CTX)] = { DRM(getsareactx), 1, 0 },
#endif

	[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 },

#if __HAVE_DMA_FLUSH
	/* Gamma only, really */
	[DRM_IOCTL_NR(DRM_IOCTL_FINISH)]        = { DRM(finish),      1, 0 },
#else
	[DRM_IOCTL_NR(DRM_IOCTL_FINISH)]        = { DRM(noop),      1, 0 },
#endif

#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.
	 */
	[DRM_IOCTL_NR(DRM_IOCTL_CONTROL)]       = { DRM(control),     1, 1 },
#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

#if __HAVE_VBL_IRQ
	[DRM_IOCTL_NR(DRM_IOCTL_WAIT_VBLANK)]   = { DRM(wait_vblank), 0, 0 },
#endif

	DRIVER_IOCTLS
};

#define DRIVER_IOCTL_COUNT	DRM_ARRAY_SIZE( DRM(ioctls) )

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

MODULE_AUTHOR( DRIVER_AUTHOR );
MODULE_DESCRIPTION( DRIVER_DESC );
MODULE_PARM( drm_opts, "s" );
MODULE_LICENSE("GPL and additional rights");

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

	DRIVER_PRESETUP();
	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) return -ENOMEM;
	memset(dev->maplist, 0, sizeof(*dev->maplist));
	INIT_LIST_HEAD(&dev->maplist->head);

	dev->vmalist = NULL;
	dev->sigdata.lock = dev->lock.hw_lock = NULL;
	init_waitqueue_head( &dev->lock.lock_queue );
	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;
	init_waitqueue_head( &dev->context_wait );

	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;
	dev->buf_async = NULL;
	init_waitqueue_head( &dev->buf_readers );
	init_waitqueue_head( &dev->buf_writers );

	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.
	 */
	DRIVER_POSTSETUP();
	return 0;
}


/**
 * Take down the DRM device.
 *
 * \param dev DRM device structure.
 *
 * Frees every resource in \p dev.
 *
 * \sa drm_device and setup().
 */
static int DRM(takedown)( drm_device_t *dev )
{
	drm_magic_entry_t *pt, *next;
	drm_map_t *map;
	drm_map_list_t *r_list;
	struct list_head *list, *list_next;
	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

	down( &dev->struct_sem );
	del_timer( &dev->timer );

	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;
			if ( entry->bound ) DRM(unbind_agp)( entry->memory );
			DRM(free_agp)( entry->memory, entry->pages );
			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 ) {
		list_for_each_safe( list, list_next, &dev->maplist->head ) {
			r_list = (drm_map_list_t *)list;

			if ( ( map = r_list->map ) ) {
				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, dev );
					break;
				case _DRM_SHM:
					vfree(map->handle);
					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;
				}
				DRM(free)(map, sizeof(*map), DRM_MEM_MAPS);
			}
			list_del( list );
			DRM(free)(r_list, sizeof(*r_list), 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++ ) {
#if __HAVE_DMA_WAITLIST
			DRM(waitlist_destroy)( &dev->queuelist[i]->waitlist );
#endif
			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->sigdata.lock = dev->lock.hw_lock = NULL; /* SHM removed */
		dev->lock.filp = 0;
		wake_up_interruptible( &dev->lock.lock_queue );
	}
	up( &dev->struct_sem );

	return 0;
}

/**
 * Figure out how many instances to initialize.
 *
 * \return number of cards found.
 *
 * Searches for every PCI card in \c DRIVER_CARD_LIST with matching vendor and device ids.
 */
static int drm_count_cards(void)
{
	int num = 0;
#if defined(DRIVER_CARD_LIST)
	int i;
	drm_pci_list_t *l;
	u16 device, vendor;
	struct pci_dev *pdev = NULL;
#endif

	DRM_DEBUG( "\n" );

#if defined(DRIVER_COUNT_CARDS)
	num = DRIVER_COUNT_CARDS();
#elif defined(DRIVER_CARD_LIST)
	for (i = 0, l = DRIVER_CARD_LIST; l[i].vendor != 0; i++) {
		pdev = NULL;
		vendor = l[i].vendor;
		device = l[i].device;
		if(device == 0xffff) device = PCI_ANY_ID;
		if(vendor == 0xffff) vendor = PCI_ANY_ID;
		while ((pdev = pci_find_device(vendor, device, pdev))) {
			num++;
		}
	}
#else
	num = DRIVER_NUM_CARDS;
#endif
	DRM_DEBUG("numdevs = %d\n", num);
	return num;
}

/**
 * Module initialization. Called via init_module at module load time, or via
 * linux/init/main.c (this is not currently supported).
 *
 * \return zero on success or a negative number on failure.
 *
 * Allocates and initialize an array of drm_device structures, and attempts to
 * initialize all available devices, using consecutive minors, registering the
 * stubs and initializing the AGP device.
 * 
 * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
 * after the initialization for driver customization.
 */
static int __init drm_init( void )
{

	drm_device_t *dev;
	int i;
#if __HAVE_CTX_BITMAP
	int retcode;
#endif
	DRM_DEBUG( "\n" );

#ifdef MODULE
	DRM(parse_options)( drm_opts );
#endif

	DRM(numdevs) = drm_count_cards();
	/* Force at least one instance. */
	if (DRM(numdevs) <= 0)
		DRM(numdevs) = 1;

	DRM(device) = kmalloc(sizeof(*DRM(device)) * DRM(numdevs), GFP_KERNEL);
	if (!DRM(device)) {
		return -ENOMEM;
	}
	DRM(minor) = kmalloc(sizeof(*DRM(minor)) * DRM(numdevs), GFP_KERNEL);
	if (!DRM(minor)) {
		kfree(DRM(device));
		return -ENOMEM;
	}

	DRIVER_PREINIT();

	DRM(mem_init)();

	for (i = 0; i < DRM(numdevs); i++) {
		dev = &(DRM(device)[i]);
		memset( (void *)dev, 0, sizeof(*dev) );
		dev->count_lock = SPIN_LOCK_UNLOCKED;
		init_timer( &dev->timer );
		sema_init( &dev->struct_sem, 1 );

		if ((DRM(minor)[i] = DRM(stub_register)(DRIVER_NAME, &DRM(fops),dev)) < 0)
			return -EPERM;
		dev->device = MKDEV(DRM_MAJOR, DRM(minor)[i] );
		dev->name   = DRIVER_NAME;

#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" );
			DRM(stub_unregister)(DRM(minor)[i]);
			DRM(takedown)( dev );
			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" );
			DRM(stub_unregister)(DRM(minor)[i]);
			DRM(takedown)( dev );
			return retcode;
		}
#endif
		DRM_INFO( "Initialized %s %d.%d.%d %s on minor %d\n",
		  	DRIVER_NAME,
		  	DRIVER_MAJOR,
		  	DRIVER_MINOR,
		  	DRIVER_PATCHLEVEL,
		  	DRIVER_DATE,
		  	DRM(minor)[i] );
	}

	DRIVER_POSTINIT();

	return 0;
}

/**
 * Called via cleanup_module() at module unload time.
 *
 * Cleans up all DRM device, calling takedown().
 * 
 * \sa drm_init().
 */
static void __exit drm_cleanup( void )
{
	drm_device_t *dev;
	int i;

	DRM_DEBUG( "\n" );

	for (i = DRM(numdevs) - 1; i >= 0; i--) {
		dev = &(DRM(device)[i]);
		if ( DRM(stub_unregister)(DRM(minor)[i]) ) {
			DRM_ERROR( "Cannot unload module\n" );
		} else {
			DRM_DEBUG("minor %d unregistered\n", DRM(minor)[i]);
			if (i == 0) {
				DRM_INFO( "Module unloaded\n" );
			}
		}
#if __HAVE_CTX_BITMAP
		DRM(ctxbitmap_cleanup)( dev );
#endif

#if __REALLY_HAVE_AGP && __REALLY_HAVE_MTRR
		if ( dev->agp && dev->agp->agp_mtrr >= 0) {
			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
	}
	DRIVER_POSTCLEANUP();
	kfree(DRM(minor));
	kfree(DRM(device));
	DRM(numdevs) = 0;
}

module_init( drm_init );
module_exit( drm_cleanup );


/**
 * Get version information
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg user argument, pointing to a drm_version structure.
 * \return zero on success or negative number on failure.
 *
 * Fills in the version information in \p arg.
 */
int DRM(version)( struct inode *inode, struct file *filp,
		  unsigned int cmd, unsigned long arg )
{
	drm_version_t version;
	int len;

	if ( copy_from_user( &version,
			     (drm_version_t *)arg,
			     sizeof(version) ) )
		return -EFAULT;

#define DRM_COPY( name, value )						\
	len = strlen( value );						\
	if ( len > name##_len ) len = name##_len;			\
	name##_len = strlen( value );					\
	if ( len && name ) {						\
		if ( copy_to_user( name, value, len ) )			\
			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 );

	if ( copy_to_user( (drm_version_t *)arg,
			   &version,
			   sizeof(version) ) )
		return -EFAULT;
	return 0;
}

/**
 * Open file.
 * 
 * \param inode device inode
 * \param filp file pointer.
 * \return zero on success or a negative number on failure.
 *
 * Searches the DRM device with the same minor number, calls open_helper(), and
 * increments the device open count. If the open count was previous at zero,
 * i.e., it's the first that the device is open, then calls setup().
 */
int DRM(open)( struct inode *inode, struct file *filp )
{
	drm_device_t *dev = NULL;
	int retcode = 0;
	int i;

	for (i = 0; i < DRM(numdevs); i++) {
		if (minor(inode->i_rdev) == DRM(minor)[i]) {
			dev = &(DRM(device)[i]);
			break;
		}
	}
	if (!dev) {
		return -ENODEV;
	}

	retcode = DRM(open_helper)( inode, filp, dev );
	if ( !retcode ) {
		atomic_inc( &dev->counts[_DRM_STAT_OPENS] );
		spin_lock( &dev->count_lock );
		if ( !dev->open_count++ ) {
			spin_unlock( &dev->count_lock );
			return DRM(setup)( dev );
		}
		spin_unlock( &dev->count_lock );
	}

	return retcode;
}

/**
 * Release file.
 *
 * \param inode device inode
 * \param filp file pointer.
 * \return zero on success or a negative number on failure.
 *
 * If the hardware lock is held then free it, and take it again for the kernel
 * context since it's necessary to reclaim buffers. Unlink the file private
 * data from its list and free it. Decreases the open count and if it reaches
 * zero calls takedown().
 */
int DRM(release)( struct inode *inode, struct file *filp )
{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev;
	int retcode = 0;

	lock_kernel();
	dev = priv->dev;

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

	DRIVER_PRERELEASE();

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

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

	if ( priv->lock_count && dev->lock.hw_lock &&
	     _DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock) &&
	     dev->lock.filp == filp ) {
		DRM_DEBUG( "File %p released, freeing lock for context %d\n",
			filp,
			_DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock) );
#if __HAVE_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 ( priv->lock_count && dev->lock.hw_lock ) {
		/* The lock is required to reclaim buffers */
		DECLARE_WAITQUEUE( entry, current );

		add_wait_queue( &dev->lock.lock_queue, &entry );
		for (;;) {
			current->state = TASK_INTERRUPTIBLE;
			if ( !dev->lock.hw_lock ) {
				/* Device has been unregistered */
				retcode = -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 */
			schedule();
			if ( signal_pending( current ) ) {
				retcode = -ERESTARTSYS;
				break;
			}
		}
		current->state = TASK_RUNNING;
		remove_wait_queue( &dev->lock.lock_queue, &entry );
		if( !retcode ) {
			DRIVER_RELEASE();
			DRM(lock_free)( dev, &dev->lock.hw_lock->lock,
					DRM_KERNEL_CONTEXT );
		}
	}
#elif __HAVE_DMA
	DRM(reclaim_buffers)( filp );
#endif

	DRM(fasync)( -1, filp, 0 );

	down( &dev->struct_sem );
	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;
	}
	up( &dev->struct_sem );
	
	DRM(free)( priv, sizeof(*priv), DRM_MEM_FILES );

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

	atomic_inc( &dev->counts[_DRM_STAT_CLOSES] );
	spin_lock( &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 );
			spin_unlock( &dev->count_lock );
			unlock_kernel();
			return -EBUSY;
		}
		spin_unlock( &dev->count_lock );
		unlock_kernel();
		return DRM(takedown)( dev );
	}
	spin_unlock( &dev->count_lock );

	unlock_kernel();

	return retcode;
}

/** 
 * Called whenever a process performs an ioctl on /dev/drm.
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg user argument.
 * \return zero on success or negative number on failure.
 *
 * Looks up the ioctl function in the ::ioctls table, checking for root
 * previleges if so required, and dispatches to the respective function.
 */
int DRM(ioctl)( struct inode *inode, struct file *filp,
		unsigned int cmd, unsigned long arg )
{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev = priv->dev;
	drm_ioctl_desc_t *ioctl;
	drm_ioctl_t *func;
	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%lx, auth=%d\n",
		   current->pid, cmd, nr, (long)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 && !capable( CAP_SYS_ADMIN ) )||
			    ( ioctl->auth_needed && !priv->authenticated ) ) {
			retcode = -EACCES;
		} else {
			retcode = func( inode, filp, cmd, arg );
		}
	}

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

/** 
 * Lock ioctl.
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg user argument, pointing to a drm_lock structure.
 * \return zero on success or negative number on failure.
 *
 * Add the current task to the lock wait queue, and attempt to take to lock.
 */
int DRM(lock)( struct inode *inode, struct file *filp,
	       unsigned int cmd, unsigned long arg )
{
        drm_file_t *priv = filp->private_data;
        drm_device_t *dev = priv->dev;
        DECLARE_WAITQUEUE( entry, current );
        drm_lock_t lock;
        int ret = 0;
#if __HAVE_MULTIPLE_DMA_QUEUES
	drm_queue_t *q;
#endif

	++priv->lock_count;

        if ( copy_from_user( &lock, (drm_lock_t *)arg, sizeof(lock) ) )
		return -EFAULT;

        if ( lock.context == DRM_KERNEL_CONTEXT ) {
                DRM_ERROR( "Process %d using kernel context %d\n",
			   current->pid, lock.context );
                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 )
                return -EINVAL;
#elif __HAVE_MULTIPLE_DMA_QUEUES
        if ( lock.context < 0 || lock.context >= dev->queue_count )
                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 ) {
                add_wait_queue( &dev->lock.lock_queue, &entry );
                for (;;) {
                        current->state = TASK_INTERRUPTIBLE;
                        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.filp      = filp;
                                dev->lock.lock_time = jiffies;
                                atomic_inc( &dev->counts[_DRM_STAT_LOCKS] );
                                break;  /* Got lock */
                        }

                                /* Contention */
                        schedule();
                        if ( signal_pending( current ) ) {
                                ret = -ERESTARTSYS;
                                break;
                        }
                }
                current->state = TASK_RUNNING;
                remove_wait_queue( &dev->lock.lock_queue, &entry );
        }

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

        if ( !ret ) {
		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 );

#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
		/* __HAVE_KERNEL_CTX_SWITCH isn't used by any of the
		 * drm modules in the DRI cvs tree, but it is required
		 * by the Sparc driver.
		 */
#if __HAVE_KERNEL_CTX_SWITCH
		if ( dev->last_context != lock.context ) {
			DRM(context_switch)(dev, dev->last_context,
					    lock.context);
		}
#endif
        }

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

        return ret;
}

/** 
 * Unlock ioctl.
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg user argument, pointing to a drm_lock structure.
 * \return zero on success or negative number on failure.
 *
 * Transfer and free the lock.
 */
int DRM(unlock)( struct inode *inode, struct file *filp,
		 unsigned int cmd, unsigned long arg )
{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev = priv->dev;
	drm_lock_t lock;

	if ( copy_from_user( &lock, (drm_lock_t *)arg, sizeof(lock) ) )
		return -EFAULT;

	if ( lock.context == DRM_KERNEL_CONTEXT ) {
		DRM_ERROR( "Process %d using kernel context %d\n",
			   current->pid, lock.context );
		return -EINVAL;
	}

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

	/* __HAVE_KERNEL_CTX_SWITCH isn't used by any of the drm
	 * modules in the DRI cvs tree, but it is required by the
	 * Sparc driver.
	 */
#if __HAVE_KERNEL_CTX_SWITCH
	/* We no longer really hold it, but if we are the next
	 * agent to request it then we should just be able to
	 * take it immediately and not eat the ioctl.
	 */
	dev->lock.filp = 0;
	{
		__volatile__ unsigned int *plock = &dev->lock.hw_lock->lock;
		unsigned int old, new, prev, ctx;

		ctx = lock.context;
		do {
			old  = *plock;
			new  = ctx;
			prev = cmpxchg(plock, old, new);
		} while (prev != old);
	}
	wake_up_interruptible(&dev->lock.lock_queue);
#else
	DRM(lock_transfer)( dev, &dev->lock.hw_lock->lock,
			    DRM_KERNEL_CONTEXT );
#if __HAVE_DMA_SCHEDULE
	DRM(dma_schedule)( dev, 1 );
#endif

	if ( DRM(lock_free)( dev, &dev->lock.hw_lock->lock,
			     DRM_KERNEL_CONTEXT ) ) {
		DRM_ERROR( "\n" );
	}
#endif /* !__HAVE_KERNEL_CTX_SWITCH */

	unblock_all_signals();
	return 0;
}
generated by cgit v1.2.3 (git 2.25.1) at 2025-11-29 22:09:12 +0000