Initial revision

1 files changed, 730 insertions, 0 deletions

diff --git a/bsd/drm_context.h b/bsd/drm_context.h
new file mode 100644
index 00000000..8d676a23
--- /dev/null
+++ b/bsd/drm_context.h
@@ -0,0 +1,730 @@
+/* drm_context.h -- IOCTLs for generic contexts -*- linux-c -*-
+ * Created: Fri Nov 24 18:31:37 2000 by gareth@valinux.com
+ *
+ * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
+ * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Rickard E. (Rik) Faith <faith@valinux.com>
+ *    Gareth Hughes <gareth@valinux.com>
+ */
+
+#define __NO_VERSION__
+#include "drmP.h"
+
+#if __HAVE_CTX_BITMAP
+
+/* ================================================================
+ * Context bitmap support
+ */
+
+void DRM(ctxbitmap_free)( drm_device_t *dev, int ctx_handle )
+{
+	if ( ctx_handle < 0 ) goto failed;
+	if ( !dev->ctx_bitmap ) goto failed;
+
+	if ( ctx_handle < DRM_MAX_CTXBITMAP ) {
+		DRM_OS_LOCK;
+		clear_bit( ctx_handle, dev->ctx_bitmap );
+		dev->context_sareas[ctx_handle] = NULL;
+		DRM_OS_UNLOCK;
+		return;
+	}
+failed:
+       	DRM_ERROR( "Attempt to free invalid context handle: %d\n",
+		   ctx_handle );
+       	return;
+}
+
+int DRM(ctxbitmap_next)( drm_device_t *dev )
+{
+	int bit;
+
+	if(!dev->ctx_bitmap) return -1;
+
+	DRM_OS_LOCK;
+	bit = find_first_zero_bit( dev->ctx_bitmap, DRM_MAX_CTXBITMAP );
+	if ( bit < DRM_MAX_CTXBITMAP ) {
+		set_bit( bit, dev->ctx_bitmap );
+	   	DRM_DEBUG( "drm_ctxbitmap_next bit : %d\n", bit );
+		if((bit+1) > dev->max_context) {
+			dev->max_context = (bit+1);
+			if(dev->context_sareas) {
+				drm_map_t **ctx_sareas;
+
+				ctx_sareas = DRM(realloc)(dev->context_sareas,
+						(dev->max_context - 1) * 
+						sizeof(*dev->context_sareas),
+						dev->max_context * 
+						sizeof(*dev->context_sareas),
+						DRM_MEM_MAPS);
+				if(!ctx_sareas) {
+					clear_bit(bit, dev->ctx_bitmap);
+					DRM_OS_UNLOCK;
+					return -1;
+				}
+				dev->context_sareas = ctx_sareas;
+				dev->context_sareas[bit] = NULL;
+			} else {
+				/* max_context == 1 at this point */
+				dev->context_sareas = DRM(alloc)(
+						dev->max_context * 
+						sizeof(*dev->context_sareas),
+						DRM_MEM_MAPS);
+				if(!dev->context_sareas) {
+					clear_bit(bit, dev->ctx_bitmap);
+					DRM_OS_UNLOCK;
+					return -1;
+				}
+				dev->context_sareas[bit] = NULL;
+			}
+		}
+		DRM_OS_UNLOCK;
+		return bit;
+	}
+	DRM_OS_UNLOCK;
+	return -1;
+}
+
+int DRM(ctxbitmap_init)( drm_device_t *dev )
+{
+	int i;
+   	int temp;
+
+	DRM_OS_LOCK;
+	dev->ctx_bitmap = (unsigned long *) DRM(alloc)( PAGE_SIZE,
+							DRM_MEM_CTXBITMAP );
+	if ( dev->ctx_bitmap == NULL ) {
+		DRM_OS_UNLOCK;
+		DRM_OS_RETURN(ENOMEM);
+	}
+	memset( (void *)dev->ctx_bitmap, 0, PAGE_SIZE );
+	dev->context_sareas = NULL;
+	dev->max_context = -1;
+	DRM_OS_UNLOCK;
+
+	for ( i = 0 ; i < DRM_RESERVED_CONTEXTS ; i++ ) {
+		temp = DRM(ctxbitmap_next)( dev );
+	   	DRM_DEBUG( "drm_ctxbitmap_init : %d\n", temp );
+	}
+
+	return 0;
+}
+
+void DRM(ctxbitmap_cleanup)( drm_device_t *dev )
+{
+	DRM_OS_LOCK;
+	if( dev->context_sareas ) DRM(free)( dev->context_sareas,
+					     sizeof(*dev->context_sareas) * 
+					     dev->max_context,
+					     DRM_MEM_MAPS );
+	DRM(free)( (void *)dev->ctx_bitmap, PAGE_SIZE, DRM_MEM_CTXBITMAP );
+	DRM_OS_UNLOCK;
+}
+
+/* ================================================================
+ * Per Context SAREA Support
+ */
+
+int DRM(getsareactx)( DRM_OS_IOCTL )
+{
+	DRM_OS_DEVICE;
+	drm_ctx_priv_map_t request;
+	drm_map_t *map;
+
+	DRM_OS_KRNFROMUSR( request, (drm_ctx_priv_map_t *)data, 
+			   sizeof(request) );
+
+	DRM_OS_LOCK;
+	if (dev->max_context < 0 || request.ctx_id >= (unsigned) dev->max_context) {
+		DRM_OS_UNLOCK;
+		DRM_OS_RETURN(EINVAL);
+	}
+
+	map = dev->context_sareas[request.ctx_id];
+	DRM_OS_UNLOCK;
+
+	request.handle = map->handle;
+
+	DRM_OS_KRNTOUSR( (drm_ctx_priv_map_t *)data, request, sizeof(request) );
+
+	return 0;
+}
+
+int DRM(setsareactx)( DRM_OS_IOCTL )
+{
+	DRM_OS_DEVICE;
+	drm_ctx_priv_map_t request;
+	drm_map_t *map = NULL;
+	drm_map_list_entry_t *list;
+
+	DRM_OS_KRNFROMUSR( request, (drm_ctx_priv_map_t *)data,
+			   sizeof(request) );
+
+	DRM_OS_LOCK;
+	TAILQ_FOREACH(list, dev->maplist, link) {
+		map=list->map;
+		if(map->handle == request.handle) 
+			goto found;
+	}
+
+bad:
+	DRM_OS_UNLOCK;
+	return -EINVAL;
+
+found:
+	map = list->map;
+	if (!map) goto bad;
+	if (dev->max_context < 0)
+		goto bad;
+	if (request.ctx_id >= (unsigned) dev->max_context)
+		goto bad;
+	dev->context_sareas[request.ctx_id] = map;
+	DRM_OS_UNLOCK;
+	return 0;
+}
+
+/* ================================================================
+ * The actual DRM context handling routines
+ */
+
+int DRM(context_switch)( drm_device_t *dev, int old, int new )
+{
+        char buf[64];
+
+        if ( test_and_set_bit( 0, &dev->context_flag ) ) {
+                DRM_ERROR( "Reentering -- FIXME\n" );
+                DRM_OS_RETURN(EBUSY);
+        }
+
+#if __HAVE_DMA_HISTOGRAM
+        dev->ctx_start = get_cycles();
+#endif
+
+        DRM_DEBUG( "Context switch from %d to %d\n", old, new );
+
+        if ( new == dev->last_context ) {
+                clear_bit( 0, &dev->context_flag );
+                return 0;
+        }
+
+        if ( DRM(flags) & DRM_FLAG_NOCTX ) {
+                DRM(context_switch_complete)( dev, new );
+        } else {
+                sprintf( buf, "C %d %d\n", old, new );
+                DRM(write_string)( dev, buf );
+        }
+
+        return 0;
+}
+
+int DRM(context_switch_complete)( drm_device_t *dev, int new )
+{
+        dev->last_context = new;  /* PRE/POST: This is the _only_ writer. */
+        dev->last_switch  = jiffies;
+
+        if ( !_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock) ) {
+                DRM_ERROR( "Lock isn't held after context switch\n" );
+        }
+
+				/* If a context switch is ever initiated
+                                   when the kernel holds the lock, release
+                                   that lock here. */
+#if __HAVE_DMA_HISTOGRAM
+        atomic_inc( &dev->histo.ctx[DRM(histogram_slot)(get_cycles()
+							- dev->ctx_start)] );
+
+#endif
+        clear_bit( 0, &dev->context_flag );
+        DRM_OS_WAKEUP( &dev->context_wait );
+
+        return 0;
+}
+
+int DRM(resctx)( DRM_OS_IOCTL )
+{
+	drm_ctx_res_t res;
+	drm_ctx_t ctx;
+	int i;
+
+	DRM_OS_KRNFROMUSR( res, (drm_ctx_res_t *)data, sizeof(res) );
+
+	if ( res.count >= DRM_RESERVED_CONTEXTS ) {
+		memset( &ctx, 0, sizeof(ctx) );
+		for ( i = 0 ; i < DRM_RESERVED_CONTEXTS ; i++ ) {
+			ctx.handle = i;
+			if ( DRM_OS_COPYTOUSR( &res.contexts[i],
+					   &i, sizeof(i) ) )
+				DRM_OS_RETURN(EFAULT);
+		}
+	}
+	res.count = DRM_RESERVED_CONTEXTS;
+
+	DRM_OS_KRNTOUSR( (drm_ctx_res_t *)data, res, sizeof(res) );
+
+	return 0;
+}
+
+int DRM(addctx)( DRM_OS_IOCTL )
+{
+	DRM_OS_DEVICE;
+	drm_ctx_t ctx;
+
+	DRM_OS_KRNFROMUSR( ctx, (drm_ctx_t *)data, sizeof(ctx) );
+
+	ctx.handle = DRM(ctxbitmap_next)( dev );
+	if ( ctx.handle == DRM_KERNEL_CONTEXT ) {
+				/* Skip kernel's context and get a new one. */
+		ctx.handle = DRM(ctxbitmap_next)( dev );
+	}
+	DRM_DEBUG( "%d\n", ctx.handle );
+	if ( ctx.handle == -1 ) {
+		DRM_DEBUG( "Not enough free contexts.\n" );
+				/* Should this return -EBUSY instead? */
+		DRM_OS_RETURN(ENOMEM);
+	}
+
+	DRM_OS_KRNTOUSR( (drm_ctx_t *)data, ctx, sizeof(ctx) );
+
+	return 0;
+}
+
+int DRM(modctx)( DRM_OS_IOCTL )
+{
+	/* This does nothing */
+	return 0;
+}
+
+int DRM(getctx)( DRM_OS_IOCTL )
+{
+	drm_ctx_t ctx;
+
+	DRM_OS_KRNFROMUSR( ctx, (drm_ctx_t *)data, sizeof(ctx) );
+
+	/* This is 0, because we don't handle any context flags */
+	ctx.flags = 0;
+
+	DRM_OS_KRNTOUSR( (drm_ctx_t *)data, ctx, sizeof(ctx) );
+
+	return 0;
+}
+
+int DRM(switchctx)( DRM_OS_IOCTL )
+{
+	DRM_OS_DEVICE;
+	drm_ctx_t ctx;
+
+	DRM_OS_KRNFROMUSR( ctx, (drm_ctx_t *)data, sizeof(ctx) );
+
+	DRM_DEBUG( "%d\n", ctx.handle );
+	return DRM(context_switch)( dev, dev->last_context, ctx.handle );
+}
+
+int DRM(newctx)( DRM_OS_IOCTL )
+{
+	DRM_OS_DEVICE;
+	drm_ctx_t ctx;
+
+	DRM_OS_KRNFROMUSR( ctx, (drm_ctx_t *)data, sizeof(ctx) );
+
+	DRM_DEBUG( "%d\n", ctx.handle );
+	DRM(context_switch_complete)( dev, ctx.handle );
+
+	return 0;
+}
+
+int DRM(rmctx)( DRM_OS_IOCTL )
+{
+	DRM_OS_DEVICE;
+	drm_ctx_t ctx;
+
+	DRM_OS_KRNFROMUSR( ctx, (drm_ctx_t *)data, sizeof(ctx) );
+
+	DRM_DEBUG( "%d\n", ctx.handle );
+	if ( ctx.handle != DRM_KERNEL_CONTEXT ) {
+		DRM(ctxbitmap_free)( dev, ctx.handle );
+	}
+
+	return 0;
+}
+
+
+#else /* __HAVE_CTX_BITMAP */
+
+/* ================================================================
+ * Old-style context support
+ */
+
+
+int DRM(context_switch)(drm_device_t *dev, int old, int new)
+{
+	char	    buf[64];
+	drm_queue_t *q;
+
+#if 0
+	atomic_inc(&dev->total_ctx);
+#endif
+
+	if (test_and_set_bit(0, &dev->context_flag)) {
+		DRM_ERROR("Reentering -- FIXME\n");
+		DRM_OS_RETURN(EBUSY);
+	}
+
+#if __HAVE_DMA_HISTOGRAM
+	dev->ctx_start = get_cycles();
+#endif
+
+	DRM_DEBUG("Context switch from %d to %d\n", old, new);
+
+	if (new >= dev->queue_count) {
+		clear_bit(0, &dev->context_flag);
+		DRM_OS_RETURN(EINVAL);
+	}
+
+	if (new == dev->last_context) {
+		clear_bit(0, &dev->context_flag);
+		return 0;
+	}
+
+	q = dev->queuelist[new];
+	atomic_inc(&q->use_count);
+	if (atomic_read(&q->use_count) == 1) {
+		atomic_dec(&q->use_count);
+		clear_bit(0, &dev->context_flag);
+		DRM_OS_RETURN(EINVAL);
+	}
+
+	if (DRM(flags) & DRM_FLAG_NOCTX) {
+		DRM(context_switch_complete)(dev, new);
+	} else {
+		sprintf(buf, "C %d %d\n", old, new);
+		DRM(write_string)(dev, buf);
+	}
+
+	atomic_dec(&q->use_count);
+
+	return 0;
+}
+
+int DRM(context_switch_complete)(drm_device_t *dev, int new)
+{
+	drm_device_dma_t *dma = dev->dma;
+
+	dev->last_context = new;  /* PRE/POST: This is the _only_ writer. */
+	dev->last_switch  = jiffies;
+
+	if (!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) {
+		DRM_ERROR("Lock isn't held after context switch\n");
+	}
+
+	if (!dma || !(dma->next_buffer && dma->next_buffer->while_locked)) {
+		if (DRM(lock_free)(dev, &dev->lock.hw_lock->lock,
+				  DRM_KERNEL_CONTEXT)) {
+			DRM_ERROR("Cannot free lock\n");
+		}
+	}
+
+#if __HAVE_DMA_HISTOGRAM
+	atomic_inc(&dev->histo.ctx[DRM(histogram_slot)(get_cycles()
+						      - dev->ctx_start)]);
+
+#endif
+	clear_bit(0, &dev->context_flag);
+	DRM_OS_WAKEUP_INT(&dev->context_wait);
+
+	return 0;
+}
+
+static int DRM(init_queue)(drm_device_t *dev, drm_queue_t *q, drm_ctx_t *ctx)
+{
+	DRM_DEBUG("\n");
+
+	if (atomic_read(&q->use_count) != 1
+	    || atomic_read(&q->finalization)
+	    || atomic_read(&q->block_count)) {
+		DRM_ERROR("New queue is already in use: u%ld f%ld b%ld\n",
+			  (unsigned long)atomic_read(&q->use_count),
+			  (unsigned long)atomic_read(&q->finalization),
+			  (unsigned long)atomic_read(&q->block_count));
+	}
+
+	atomic_set(&q->finalization,  0);
+	atomic_set(&q->block_count,   0);
+	atomic_set(&q->block_read,    0);
+	atomic_set(&q->block_write,   0);
+	atomic_set(&q->total_queued,  0);
+	atomic_set(&q->total_flushed, 0);
+	atomic_set(&q->total_locks,   0);
+
+	q->write_queue = 0;
+	q->read_queue = 0;
+	q->flush_queue = 0;
+
+	q->flags = ctx->flags;
+
+	DRM(waitlist_create)(&q->waitlist, dev->dma->buf_count);
+
+	return 0;
+}
+
+
+/* drm_alloc_queue:
+PRE: 1) dev->queuelist[0..dev->queue_count] is allocated and will not
+	disappear (so all deallocation must be done after IOCTLs are off)
+     2) dev->queue_count < dev->queue_slots
+     3) dev->queuelist[i].use_count == 0 and
+	dev->queuelist[i].finalization == 0 if i not in use
+POST: 1) dev->queuelist[i].use_count == 1
+      2) dev->queue_count < dev->queue_slots */
+
+static int DRM(alloc_queue)(drm_device_t *dev)
+{
+	int	    i;
+	drm_queue_t *queue;
+	int	    oldslots;
+	int	    newslots;
+				/* Check for a free queue */
+	for (i = 0; i < dev->queue_count; i++) {
+		atomic_inc(&dev->queuelist[i]->use_count);
+		if (atomic_read(&dev->queuelist[i]->use_count) == 1
+		    && !atomic_read(&dev->queuelist[i]->finalization)) {
+			DRM_DEBUG("%d (free)\n", i);
+			return i;
+		}
+		atomic_dec(&dev->queuelist[i]->use_count);
+	}
+				/* Allocate a new queue */
+	DRM_OS_LOCK;
+
+	queue = gamma_alloc(sizeof(*queue), DRM_MEM_QUEUES);
+	memset(queue, 0, sizeof(*queue));
+	atomic_set(&queue->use_count, 1);
+
+	++dev->queue_count;
+	if (dev->queue_count >= dev->queue_slots) {
+		oldslots = dev->queue_slots * sizeof(*dev->queuelist);
+		if (!dev->queue_slots) dev->queue_slots = 1;
+		dev->queue_slots *= 2;
+		newslots = dev->queue_slots * sizeof(*dev->queuelist);
+
+		dev->queuelist = DRM(realloc)(dev->queuelist,
+					      oldslots,
+					      newslots,
+					      DRM_MEM_QUEUES);
+		if (!dev->queuelist) {
+			DRM_OS_UNLOCK;
+			DRM_DEBUG("out of memory\n");
+			DRM_OS_RETURN(ENOMEM);
+		}
+	}
+	dev->queuelist[dev->queue_count-1] = queue;
+
+	DRM_OS_UNLOCK;
+	DRM_DEBUG("%d (new)\n", dev->queue_count - 1);
+	return dev->queue_count - 1;
+}
+
+int DRM(resctx)( DRM_OS_IOCTL )
+{
+	drm_ctx_res_t	res;
+	drm_ctx_t	ctx;
+	int		i;
+
+	DRM_DEBUG("%d\n", DRM_RESERVED_CONTEXTS);
+	
+	DRM_OS_KRNFROMUSR( res, (drm_ctx_res_t *)data, sizeof(res) );
+
+	if (res.count >= DRM_RESERVED_CONTEXTS) {
+		memset(&ctx, 0, sizeof(ctx));
+		for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) {
+			ctx.handle = i;
+			if (DRM_OS_COPYTOUSR(&res.contexts[i],
+					 &i,
+					 sizeof(i)))
+				DRM_OS_RETURN(EFAULT);
+		}
+	}
+	res.count = DRM_RESERVED_CONTEXTS;
+
+	DRM_OS_KRNTOUSR( (drm_ctx_res_t *)data, res, sizeof(res) );
+
+	return 0;
+}
+
+int DRM(addctx)( DRM_OS_IOCTL )
+{
+	DRM_OS_DEVICE;
+	drm_ctx_t	ctx;
+
+	DRM_OS_KRNFROMUSR( ctx, (drm_ctx_t *)data, sizeof(ctx) );
+
+	if ((ctx.handle = DRM(alloc_queue)(dev)) == DRM_KERNEL_CONTEXT) {
+				/* Init kernel's context and get a new one. */
+		DRM(init_queue)(dev, dev->queuelist[ctx.handle], &ctx);
+		ctx.handle = DRM(alloc_queue)(dev);
+	}
+	DRM(init_queue)(dev, dev->queuelist[ctx.handle], &ctx);
+	DRM_DEBUG("%d\n", ctx.handle);
+	
+	DRM_OS_KRNTOUSR( (drm_ctx_t *)data, ctx, sizeof(ctx) );
+
+	return 0;
+}
+
+int DRM(modctx)( DRM_OS_IOCTL )
+{
+	DRM_OS_DEVICE;
+	drm_ctx_t	ctx;
+	drm_queue_t	*q;
+
+	DRM_OS_KRNFROMUSR( ctx, (drm_ctx_t *)data, sizeof(ctx) );
+
+	DRM_DEBUG("%d\n", ctx.handle);
+
+	if (ctx.handle < 0 || ctx.handle >= dev->queue_count) 
+		DRM_OS_RETURN(EINVAL);
+	q = dev->queuelist[ctx.handle];
+
+	atomic_inc(&q->use_count);
+	if (atomic_read(&q->use_count) == 1) {
+				/* No longer in use */
+		atomic_dec(&q->use_count);
+		DRM_OS_RETURN(EINVAL);
+	}
+
+	if (DRM_BUFCOUNT(&q->waitlist)) {
+		atomic_dec(&q->use_count);
+		DRM_OS_RETURN(EBUSY);
+	}
+
+	q->flags = ctx.flags;
+
+	atomic_dec(&q->use_count);
+	return 0;
+}
+
+int DRM(getctx)( DRM_OS_IOCTL )
+{
+	DRM_OS_DEVICE;
+	drm_ctx_t	ctx;
+	drm_queue_t	*q;
+
+	DRM_OS_KRNFROMUSR( ctx, (drm_ctx_t *)data, sizeof(ctx) );
+
+	DRM_DEBUG("%d\n", ctx.handle);
+
+	if (ctx.handle >= dev->queue_count) 
+		DRM_OS_RETURN(EINVAL);
+	q = dev->queuelist[ctx.handle];
+
+	atomic_inc(&q->use_count);
+	if (atomic_read(&q->use_count) == 1) {
+				/* No longer in use */
+		atomic_dec(&q->use_count);
+		DRM_OS_RETURN(EINVAL);
+	}
+
+	ctx.flags = q->flags;
+	atomic_dec(&q->use_count);
+
+	DRM_OS_KRNTOUSR( (drm_ctx_t *)data, ctx, sizeof(ctx) );
+
+	return 0;
+}
+
+int DRM(switchctx)( DRM_OS_IOCTL )
+{
+	DRM_OS_DEVICE;
+	drm_ctx_t	ctx;
+
+	DRM_OS_KRNFROMUSR( ctx, (drm_ctx_t *)data, sizeof(ctx) );
+
+	DRM_DEBUG("%d\n", ctx.handle);
+	return DRM(context_switch)(dev, dev->last_context, ctx.handle);
+}
+
+int DRM(newctx)( DRM_OS_IOCTL )
+{
+	DRM_OS_DEVICE;
+	drm_ctx_t	ctx;
+
+	DRM_OS_KRNFROMUSR( ctx, (drm_ctx_t *)data, sizeof(ctx) );
+
+	DRM_DEBUG("%d\n", ctx.handle);
+	DRM(context_switch_complete)(dev, ctx.handle);
+
+	return 0;
+}
+
+int DRM(rmctx)( DRM_OS_IOCTL )
+{
+	DRM_OS_DEVICE;
+	drm_ctx_t	ctx;
+	drm_queue_t	*q;
+	drm_buf_t	*buf;
+
+	DRM_OS_KRNFROMUSR( ctx, (drm_ctx_t *)data, sizeof(ctx) );
+
+	DRM_DEBUG("%d\n", ctx.handle);
+
+	if (ctx.handle >= dev->queue_count) DRM_OS_RETURN(EINVAL);
+	q = dev->queuelist[ctx.handle];
+
+	atomic_inc(&q->use_count);
+	if (atomic_read(&q->use_count) == 1) {
+				/* No longer in use */
+		atomic_dec(&q->use_count);
+		DRM_OS_RETURN(EINVAL);
+	}
+
+	atomic_inc(&q->finalization); /* Mark queue in finalization state */
+	atomic_sub(2, &q->use_count); /* Mark queue as unused (pending
+					 finalization) */
+
+	while (test_and_set_bit(0, &dev->interrupt_flag)) {
+		static int never;
+		int retcode;
+		retcode = tsleep(&never, PZERO|PCATCH, "never", 1);
+		if (retcode)
+			return retcode;
+	}
+				/* Remove queued buffers */
+	while ((buf = DRM(waitlist_get)(&q->waitlist))) {
+		DRM(free_buffer)(dev, buf);
+	}
+	clear_bit(0, &dev->interrupt_flag);
+
+				/* Wakeup blocked processes */
+	wakeup( &q->block_read );
+	wakeup( &q->block_write );
+	DRM_OS_WAKEUP_INT( &q->flush_queue );
+				/* Finalization over.  Queue is made
+				   available when both use_count and
+				   finalization become 0, which won't
+				   happen until all the waiting processes
+				   stop waiting. */
+	atomic_dec(&q->finalization);
+	return 0;
+}
+
+#endif /* __HAVE_CTX_BITMAP */