- Move IRQ functions from drm_dma.h to new drm_irq.h and disentangle them

    from __HAVE_DMA. This will be useful for adding vblank sync support to
    sis and tdfx. Rename dma_service to irq_handler, which is more
    accurately what it is.
- Fix the #if _HAVE_DMA_IRQ in radeon, r128, mga, i810, i830, gamma to have
    the right number of underscores. This may have been a problem in the
    case that the server died without doing its DRM_IOCTL_CONTROL to
    uninit.

18 files changed, 380 insertions, 331 deletions

diff --git a/linux/Doxyfile b/linux/Doxyfile
index 2d025898..4bef88f7 100644
--- a/linux/Doxyfile
+++ b/linux/Doxyfile
@@ -852,7 +852,7 @@ PREDEFINED             = \
 			__HAVE_SG=0 \
 			__HAVE_PCI_DMA=0 \
 			__HAVE_DMA=1 \
-			__HAVE_DMA_IRQ=1 \
+			__HAVE_IRQ=1 \
 			__HAVE_VBL_IRQ=1 \
 			__HAVE_SHARED_IRQ=1
 
diff --git a/linux/Makefile.linux b/linux/Makefile.linux
index e873242e..babf41a1 100644
--- a/linux/Makefile.linux
+++ b/linux/Makefile.linux
@@ -59,7 +59,7 @@ DRM_MODULES ?= $(MODULE_LIST)
 # These definitions are for handling dependencies in the out of kernel build.
 
 DRMTEMPLATES =  drm_auth.h drm_bufs.h drm_context.h drm_dma.h drm_drawable.h \
-                drm_drv.h drm_fops.h drm_init.h drm_ioctl.h \
+                drm_drv.h drm_fops.h drm_init.h drm_ioctl.h drm_irq.h \
                 drm_lock.h drm_memory.h drm_proc.h drm_stub.h drm_vm.h
 
 DRMSHARED =     drm_sarea.h
diff --git a/linux/drmP.h b/linux/drmP.h
index f7137b25..ae499cae 100644
--- a/linux/drmP.h
+++ b/linux/drmP.h
@@ -102,8 +102,8 @@
 #ifndef __HAVE_DMA
 #define __HAVE_DMA		0
 #endif
-#ifndef __HAVE_DMA_IRQ
-#define __HAVE_DMA_IRQ		0
+#ifndef __HAVE_IRQ
+#define __HAVE_IRQ		0
 #endif
 #ifndef __HAVE_DMA_WAITLIST
 #define __HAVE_DMA_WAITLIST	0
@@ -937,12 +937,17 @@ extern int	     DRM(dma_setup)(drm_device_t *dev);
 extern void	     DRM(dma_takedown)(drm_device_t *dev);
 extern void	     DRM(free_buffer)(drm_device_t *dev, drm_buf_t *buf);
 extern void	     DRM(reclaim_buffers)( struct file *filp );
-#if __HAVE_DMA_IRQ
+#endif /* __HAVE_DMA */
+
+				/* IRQ support (drm_irq.h) */
+#if __HAVE_IRQ || __HAVE_DMA
 extern int           DRM(control)( struct inode *inode, struct file *filp,
 				   unsigned int cmd, unsigned long arg );
+#endif
+#if __HAVE_IRQ
 extern int           DRM(irq_install)( drm_device_t *dev, int irq );
 extern int           DRM(irq_uninstall)( drm_device_t *dev );
-extern irqreturn_t   DRM(dma_service)( DRM_IRQ_ARGS );
+extern irqreturn_t   DRM(irq_handler)( DRM_IRQ_ARGS );
 extern void          DRM(driver_irq_preinstall)( drm_device_t *dev );
 extern void          DRM(driver_irq_postinstall)( drm_device_t *dev );
 extern void          DRM(driver_irq_uninstall)( drm_device_t *dev );
@@ -952,12 +957,11 @@ extern int           DRM(wait_vblank)(struct inode *inode, struct file *filp,
 extern int           DRM(vblank_wait)(drm_device_t *dev, unsigned int *vbl_seq);
 extern void          DRM(vbl_send_signals)( drm_device_t *dev );
 #endif
-#if __HAVE_DMA_IRQ_BH
-extern void          DRM(dma_immediate_bh)( void *dev );
+#if __HAVE_IRQ_BH
+extern void          DRM(irq_immediate_bh)( void *dev );
 #endif
 #endif
 
-#endif /* __HAVE_DMA */
 
 #if __REALLY_HAVE_AGP
 				/* AGP/GART support (drm_agpsupport.h) */
diff --git a/linux/drm_dma.h b/linux/drm_dma.h
index aef84d4e..f36cd1c1 100644
--- a/linux/drm_dma.h
+++ b/linux/drm_dma.h
@@ -36,7 +36,6 @@
 #define __NO_VERSION__
 #include "drmP.h"
 
-#include <linux/interrupt.h>	/* For task queue support */
 
 #ifndef __HAVE_DMA_WAITQUEUE
 #define __HAVE_DMA_WAITQUEUE	0
@@ -44,15 +43,6 @@
 #ifndef __HAVE_DMA_RECLAIM
 #define __HAVE_DMA_RECLAIM	0
 #endif
-#ifndef __HAVE_SHARED_IRQ
-#define __HAVE_SHARED_IRQ	0
-#endif
-
-#if __HAVE_SHARED_IRQ
-#define DRM_IRQ_TYPE		SA_SHIRQ
-#else
-#define DRM_IRQ_TYPE		0
-#endif
 
 #if __HAVE_DMA
 
@@ -215,303 +205,14 @@ void DRM(reclaim_buffers)( struct file *filp )
 }
 #endif
 
-
-
-
-#if __HAVE_DMA_IRQ
-
-/**
- * Install IRQ handler.
- *
- * \param dev DRM device.
- * \param irq IRQ number.
- *
- * Initializes the IRQ related data, and setups drm_device::vbl_queue. Installs the handler, calling the driver
- * \c DRM(driver_irq_preinstall)() and \c DRM(driver_irq_postinstall)() functions
- * before and after the installation.
- */
-int DRM(irq_install)( drm_device_t *dev, int irq )
-{
-	int ret;
-
-	if ( !irq )
-		return -EINVAL;
-
-	down( &dev->struct_sem );
-
-	/* Driver must have been initialized */
-	if ( !dev->dev_private ) {
-		up( &dev->struct_sem );
-		return -EINVAL;
-	}
-
-	if ( dev->irq ) {
-		up( &dev->struct_sem );
-		return -EBUSY;
-	}
-	dev->irq = irq;
-	up( &dev->struct_sem );
-
-	DRM_DEBUG( "%s: irq=%d\n", __FUNCTION__, irq );
-
-	dev->context_flag = 0;
-	dev->interrupt_flag = 0;
-	dev->dma_flag = 0;
-
-	dev->dma->next_buffer = NULL;
-	dev->dma->next_queue = NULL;
-	dev->dma->this_buffer = NULL;
-
-#if __HAVE_DMA_IRQ_BH
-#if !HAS_WORKQUEUE
-	INIT_LIST_HEAD( &dev->tq.list );
-	dev->tq.sync = 0;
-	dev->tq.routine = DRM(dma_immediate_bh);
-	dev->tq.data = dev;
-#else
-	INIT_WORK(&dev->work, DRM(dma_immediate_bh), dev);
-#endif
-#endif
-
-#if __HAVE_VBL_IRQ
-	init_waitqueue_head(&dev->vbl_queue);
-
-	spin_lock_init( &dev->vbl_lock );
-
-	INIT_LIST_HEAD( &dev->vbl_sigs.head );
-
-	dev->vbl_pending = 0;
-#endif
-
-				/* Before installing handler */
-	DRM(driver_irq_preinstall)(dev);
-
-				/* Install handler */
-	ret = request_irq( dev->irq, DRM(dma_service),
-			   DRM_IRQ_TYPE, dev->devname, dev );
-	if ( ret < 0 ) {
-		down( &dev->struct_sem );
-		dev->irq = 0;
-		up( &dev->struct_sem );
-		return ret;
-	}
-
-				/* After installing handler */
-	DRM(driver_irq_postinstall)(dev);
-
-	return 0;
-}
-
-/**
- * Uninstall the IRQ handler.
- *
- * \param dev DRM device.
- *
- * Calls the driver's \c DRM(driver_irq_uninstall)() function, and stops the irq.
- */
-int DRM(irq_uninstall)( drm_device_t *dev )
-{
-	int irq;
-
-	down( &dev->struct_sem );
-	irq = dev->irq;
-	dev->irq = 0;
-	up( &dev->struct_sem );
-
-	if ( !irq )
-		return -EINVAL;
-
-	DRM_DEBUG( "%s: irq=%d\n", __FUNCTION__, irq );
-
-	DRM(driver_irq_uninstall)( dev );
-
-	free_irq( irq, dev );
-
-	return 0;
-}
-
-/**
- * IRQ control ioctl.
- *
- * \param inode device inode.
- * \param filp file pointer.
- * \param cmd command.
- * \param arg user argument, pointing to a drm_control structure.
- * \return zero on success or a negative number on failure.
- *
- * Calls irq_install() or irq_uninstall() according to \p arg.
+#if !__HAVE_IRQ
+/* This stub DRM_IOCTL_CONTROL handler is for the drivers that used to require
+ * IRQs for DMA but no longer do.  It maintains compatibility with the X Servers
+ * that try to use the control ioctl by simply returning success.
  */
 int DRM(control)( 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_control_t ctl;
-
-	if ( copy_from_user( &ctl, (drm_control_t *)arg, sizeof(ctl) ) )
-		return -EFAULT;
-
-	switch ( ctl.func ) {
-	case DRM_INST_HANDLER:
-		return DRM(irq_install)( dev, ctl.irq );
-	case DRM_UNINST_HANDLER:
-		return DRM(irq_uninstall)( dev );
-	default:
-		return -EINVAL;
-	}
-}
-
-#if __HAVE_VBL_IRQ
-
-/**
- * Wait for VBLANK.
- *
- * \param inode device inode.
- * \param filp file pointer.
- * \param cmd command.
- * \param data user argument, pointing to a drm_wait_vblank structure.
- * \return zero on success or a negative number on failure.
- *
- * Verifies the IRQ is installed. 
- *
- * If a signal is requested checks if this task has already scheduled the same signal
- * for the same vblank sequence number - nothing to be done in
- * that case. If the number of tasks waiting for the interrupt exceeds 100 the
- * function fails. Otherwise adds a new entry to drm_device::vbl_sigs for this
- * task.
- *
- * If a signal is not requested, then calls vblank_wait().
- */
-int DRM(wait_vblank)( DRM_IOCTL_ARGS )
-{
-	drm_file_t *priv = filp->private_data;
-	drm_device_t *dev = priv->dev;
-	drm_wait_vblank_t vblwait;
-	struct timeval now;
-	int ret = 0;
-	unsigned int flags;
-
-	if (!dev->irq)
-		return -EINVAL;
-
-	DRM_COPY_FROM_USER_IOCTL( vblwait, (drm_wait_vblank_t *)data,
-				  sizeof(vblwait) );
-
-	switch ( vblwait.request.type & ~_DRM_VBLANK_FLAGS_MASK ) {
-	case _DRM_VBLANK_RELATIVE:
-		vblwait.request.sequence += atomic_read( &dev->vbl_received );
-		vblwait.request.type &= ~_DRM_VBLANK_RELATIVE;
-	case _DRM_VBLANK_ABSOLUTE:
-		break;
-	default:
-		return -EINVAL;
-	}
-
-	flags = vblwait.request.type & _DRM_VBLANK_FLAGS_MASK;
-	
-	if ( flags & _DRM_VBLANK_SIGNAL ) {
-		unsigned long irqflags;
-		drm_vbl_sig_t *vbl_sig;
-		
-		vblwait.reply.sequence = atomic_read( &dev->vbl_received );
-
-		spin_lock_irqsave( &dev->vbl_lock, irqflags );
-
-		/* Check if this task has already scheduled the same signal
-		 * for the same vblank sequence number; nothing to be done in
-		 * that case
-		 */
-		list_for_each_entry( vbl_sig, &dev->vbl_sigs.head, head ) {
-			if (vbl_sig->sequence == vblwait.request.sequence
-			    && vbl_sig->info.si_signo == vblwait.request.signal
-			    && vbl_sig->task == current)
-			{
-				spin_unlock_irqrestore( &dev->vbl_lock, irqflags );
-				goto done;
-			}
-		}
-
-		if ( dev->vbl_pending >= 100 ) {
-			spin_unlock_irqrestore( &dev->vbl_lock, irqflags );
-			return -EBUSY;
-		}
-
-		dev->vbl_pending++;
-
-		spin_unlock_irqrestore( &dev->vbl_lock, irqflags );
-
-		if ( !( vbl_sig = DRM_MALLOC( sizeof( drm_vbl_sig_t ) ) ) ) {
-			return -ENOMEM;
-		}
-
-		memset( (void *)vbl_sig, 0, sizeof(*vbl_sig) );
-
-		vbl_sig->sequence = vblwait.request.sequence;
-		vbl_sig->info.si_signo = vblwait.request.signal;
-		vbl_sig->task = current;
-
-		spin_lock_irqsave( &dev->vbl_lock, irqflags );
-
-		list_add_tail( (struct list_head *) vbl_sig, &dev->vbl_sigs.head );
-
-		spin_unlock_irqrestore( &dev->vbl_lock, irqflags );
-	} else {
-		ret = DRM(vblank_wait)( dev, &vblwait.request.sequence );
-
-		do_gettimeofday( &now );
-		vblwait.reply.tval_sec = now.tv_sec;
-		vblwait.reply.tval_usec = now.tv_usec;
-	}
-
-done:
-	DRM_COPY_TO_USER_IOCTL( (drm_wait_vblank_t *)data, vblwait,
-				sizeof(vblwait) );
-
-	return ret;
-}
-
-/**
- * Send the VBLANK signals.
- *
- * \param dev DRM device.
- *
- * Sends a signal for each task in drm_device::vbl_sigs and empties the list.
- *
- * If a signal is not requested, then calls vblank_wait().
- */
-void DRM(vbl_send_signals)( drm_device_t *dev )
-{
-	struct list_head *list, *tmp;
-	drm_vbl_sig_t *vbl_sig;
-	unsigned int vbl_seq = atomic_read( &dev->vbl_received );
-	unsigned long flags;
-
-	spin_lock_irqsave( &dev->vbl_lock, flags );
-
-	list_for_each_safe( list, tmp, &dev->vbl_sigs.head ) {
-		vbl_sig = list_entry( list, drm_vbl_sig_t, head );
-		if ( ( vbl_seq - vbl_sig->sequence ) <= (1<<23) ) {
-			vbl_sig->info.si_code = vbl_seq;
-			send_sig_info( vbl_sig->info.si_signo, &vbl_sig->info, vbl_sig->task );
-
-			list_del( list );
-
-			DRM_FREE( vbl_sig, sizeof(*vbl_sig) );
-
-			dev->vbl_pending--;
-		}
-	}
-
-	spin_unlock_irqrestore( &dev->vbl_lock, flags );
-}
-
-#endif	/* __HAVE_VBL_IRQ */
-
-#else
-
-int DRM(control)( struct inode *inode, struct file *filp,
-		  unsigned int cmd, unsigned long arg )
-{
 	drm_control_t ctl;
 
 	if ( copy_from_user( &ctl, (drm_control_t *)arg, sizeof(ctl) ) )
@@ -525,7 +226,6 @@ int DRM(control)( struct inode *inode, struct file *filp,
 		return -EINVAL;
 	}
 }
-
-#endif /* __HAVE_DMA_IRQ */
+#endif
 
 #endif /* __HAVE_DMA */
diff --git a/linux/drm_drv.h b/linux/drm_drv.h
index 801118e3..d1bad56a 100644
--- a/linux/drm_drv.h
+++ b/linux/drm_drv.h
@@ -58,8 +58,8 @@
 #ifndef __HAVE_CTX_BITMAP
 #define __HAVE_CTX_BITMAP		0
 #endif
-#ifndef __HAVE_DMA_IRQ
-#define __HAVE_DMA_IRQ			0
+#ifndef __HAVE_IRQ
+#define __HAVE_IRQ			0
 #endif
 #ifndef __HAVE_DMA_QUEUE
 #define __HAVE_DMA_QUEUE		0
@@ -215,9 +215,9 @@ static drm_ioctl_desc_t		  DRM(ioctls)[] = {
 	[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.
-	 */
+	/* The DRM_IOCTL_DMA ioctl should be defined by the driver. */
+#endif
+#if __HAVE_IRQ || __HAVE_DMA
 	[DRM_IOCTL_NR(DRM_IOCTL_CONTROL)]       = { DRM(control),     1, 1 },
 #endif
 
@@ -384,7 +384,7 @@ static int DRM(takedown)( drm_device_t *dev )
 	DRM_DEBUG( "\n" );
 
 	DRIVER_PRETAKEDOWN();
-#if __HAVE_DMA_IRQ
+#if __HAVE_IRQ
 	if ( dev->irq ) DRM(irq_uninstall)( dev );
 #endif
 
diff --git a/linux/drm_irq.h b/linux/drm_irq.h
new file mode 100644
index 00000000..322e5717
--- /dev/null
+++ b/linux/drm_irq.h
@@ -0,0 +1,340 @@
+/**
+ * \file drm_irq.h 
+ * IRQ support
+ *
+ * \author Rickard E. (Rik) Faith <faith@valinux.com>
+ * \author Gareth Hughes <gareth@valinux.com>
+ */
+
+/*
+ * Created: Fri Mar 19 14:30:16 1999 by faith@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.
+ */
+
+#define __NO_VERSION__
+#include "drmP.h"
+
+#include <linux/interrupt.h>	/* For task queue support */
+
+#ifndef __HAVE_SHARED_IRQ
+#define __HAVE_SHARED_IRQ	0
+#endif
+
+#if __HAVE_SHARED_IRQ
+#define DRM_IRQ_TYPE		SA_SHIRQ
+#else
+#define DRM_IRQ_TYPE		0
+#endif
+
+#if __HAVE_IRQ
+
+/**
+ * Install IRQ handler.
+ *
+ * \param dev DRM device.
+ * \param irq IRQ number.
+ *
+ * Initializes the IRQ related data, and setups drm_device::vbl_queue. Installs the handler, calling the driver
+ * \c DRM(driver_irq_preinstall)() and \c DRM(driver_irq_postinstall)() functions
+ * before and after the installation.
+ */
+int DRM(irq_install)( drm_device_t *dev, int irq )
+{
+	int ret;
+
+	if ( !irq )
+		return -EINVAL;
+
+	down( &dev->struct_sem );
+
+	/* Driver must have been initialized */
+	if ( !dev->dev_private ) {
+		up( &dev->struct_sem );
+		return -EINVAL;
+	}
+
+	if ( dev->irq ) {
+		up( &dev->struct_sem );
+		return -EBUSY;
+	}
+	dev->irq = irq;
+	up( &dev->struct_sem );
+
+	DRM_DEBUG( "%s: irq=%d\n", __FUNCTION__, irq );
+
+	dev->context_flag = 0;
+	dev->interrupt_flag = 0;
+	dev->dma_flag = 0;
+
+	dev->dma->next_buffer = NULL;
+	dev->dma->next_queue = NULL;
+	dev->dma->this_buffer = NULL;
+
+#if __HAVE_IRQ_BH
+#if !HAS_WORKQUEUE
+	INIT_LIST_HEAD( &dev->tq.list );
+	dev->tq.sync = 0;
+	dev->tq.routine = DRM(irq_immediate_bh);
+	dev->tq.data = dev;
+#else
+	INIT_WORK(&dev->work, DRM(irq_immediate_bh), dev);
+#endif
+#endif
+
+#if __HAVE_VBL_IRQ
+	init_waitqueue_head(&dev->vbl_queue);
+
+	spin_lock_init( &dev->vbl_lock );
+
+	INIT_LIST_HEAD( &dev->vbl_sigs.head );
+
+	dev->vbl_pending = 0;
+#endif
+
+				/* Before installing handler */
+	DRM(driver_irq_preinstall)(dev);
+
+				/* Install handler */
+	ret = request_irq( dev->irq, DRM(irq_handler),
+			   DRM_IRQ_TYPE, dev->devname, dev );
+	if ( ret < 0 ) {
+		down( &dev->struct_sem );
+		dev->irq = 0;
+		up( &dev->struct_sem );
+		return ret;
+	}
+
+				/* After installing handler */
+	DRM(driver_irq_postinstall)(dev);
+
+	return 0;
+}
+
+/**
+ * Uninstall the IRQ handler.
+ *
+ * \param dev DRM device.
+ *
+ * Calls the driver's \c DRM(driver_irq_uninstall)() function, and stops the irq.
+ */
+int DRM(irq_uninstall)( drm_device_t *dev )
+{
+	int irq;
+
+	down( &dev->struct_sem );
+	irq = dev->irq;
+	dev->irq = 0;
+	up( &dev->struct_sem );
+
+	if ( !irq )
+		return -EINVAL;
+
+	DRM_DEBUG( "%s: irq=%d\n", __FUNCTION__, irq );
+
+	DRM(driver_irq_uninstall)( dev );
+
+	free_irq( irq, dev );
+
+	return 0;
+}
+
+/**
+ * IRQ control ioctl.
+ *
+ * \param inode device inode.
+ * \param filp file pointer.
+ * \param cmd command.
+ * \param arg user argument, pointing to a drm_control structure.
+ * \return zero on success or a negative number on failure.
+ *
+ * Calls irq_install() or irq_uninstall() according to \p arg.
+ */
+int DRM(control)( 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_control_t ctl;
+
+	if ( copy_from_user( &ctl, (drm_control_t *)arg, sizeof(ctl) ) )
+		return -EFAULT;
+
+	switch ( ctl.func ) {
+	case DRM_INST_HANDLER:
+		return DRM(irq_install)( dev, ctl.irq );
+	case DRM_UNINST_HANDLER:
+		return DRM(irq_uninstall)( dev );
+	default:
+		return -EINVAL;
+	}
+}
+
+#if __HAVE_VBL_IRQ
+
+/**
+ * Wait for VBLANK.
+ *
+ * \param inode device inode.
+ * \param filp file pointer.
+ * \param cmd command.
+ * \param data user argument, pointing to a drm_wait_vblank structure.
+ * \return zero on success or a negative number on failure.
+ *
+ * Verifies the IRQ is installed. 
+ *
+ * If a signal is requested checks if this task has already scheduled the same signal
+ * for the same vblank sequence number - nothing to be done in
+ * that case. If the number of tasks waiting for the interrupt exceeds 100 the
+ * function fails. Otherwise adds a new entry to drm_device::vbl_sigs for this
+ * task.
+ *
+ * If a signal is not requested, then calls vblank_wait().
+ */
+int DRM(wait_vblank)( DRM_IOCTL_ARGS )
+{
+	drm_file_t *priv = filp->private_data;
+	drm_device_t *dev = priv->dev;
+	drm_wait_vblank_t vblwait;
+	struct timeval now;
+	int ret = 0;
+	unsigned int flags;
+
+	if (!dev->irq)
+		return -EINVAL;
+
+	DRM_COPY_FROM_USER_IOCTL( vblwait, (drm_wait_vblank_t *)data,
+				  sizeof(vblwait) );
+
+	switch ( vblwait.request.type & ~_DRM_VBLANK_FLAGS_MASK ) {
+	case _DRM_VBLANK_RELATIVE:
+		vblwait.request.sequence += atomic_read( &dev->vbl_received );
+		vblwait.request.type &= ~_DRM_VBLANK_RELATIVE;
+	case _DRM_VBLANK_ABSOLUTE:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	flags = vblwait.request.type & _DRM_VBLANK_FLAGS_MASK;
+	
+	if ( flags & _DRM_VBLANK_SIGNAL ) {
+		unsigned long irqflags;
+		drm_vbl_sig_t *vbl_sig;
+		
+		vblwait.reply.sequence = atomic_read( &dev->vbl_received );
+
+		spin_lock_irqsave( &dev->vbl_lock, irqflags );
+
+		/* Check if this task has already scheduled the same signal
+		 * for the same vblank sequence number; nothing to be done in
+		 * that case
+		 */
+		list_for_each_entry( vbl_sig, &dev->vbl_sigs.head, head ) {
+			if (vbl_sig->sequence == vblwait.request.sequence
+			    && vbl_sig->info.si_signo == vblwait.request.signal
+			    && vbl_sig->task == current)
+			{
+				spin_unlock_irqrestore( &dev->vbl_lock, irqflags );
+				goto done;
+			}
+		}
+
+		if ( dev->vbl_pending >= 100 ) {
+			spin_unlock_irqrestore( &dev->vbl_lock, irqflags );
+			return -EBUSY;
+		}
+
+		dev->vbl_pending++;
+
+		spin_unlock_irqrestore( &dev->vbl_lock, irqflags );
+
+		if ( !( vbl_sig = DRM_MALLOC( sizeof( drm_vbl_sig_t ) ) ) ) {
+			return -ENOMEM;
+		}
+
+		memset( (void *)vbl_sig, 0, sizeof(*vbl_sig) );
+
+		vbl_sig->sequence = vblwait.request.sequence;
+		vbl_sig->info.si_signo = vblwait.request.signal;
+		vbl_sig->task = current;
+
+		spin_lock_irqsave( &dev->vbl_lock, irqflags );
+
+		list_add_tail( (struct list_head *) vbl_sig, &dev->vbl_sigs.head );
+
+		spin_unlock_irqrestore( &dev->vbl_lock, irqflags );
+	} else {
+		ret = DRM(vblank_wait)( dev, &vblwait.request.sequence );
+
+		do_gettimeofday( &now );
+		vblwait.reply.tval_sec = now.tv_sec;
+		vblwait.reply.tval_usec = now.tv_usec;
+	}
+
+done:
+	DRM_COPY_TO_USER_IOCTL( (drm_wait_vblank_t *)data, vblwait,
+				sizeof(vblwait) );
+
+	return ret;
+}
+
+/**
+ * Send the VBLANK signals.
+ *
+ * \param dev DRM device.
+ *
+ * Sends a signal for each task in drm_device::vbl_sigs and empties the list.
+ *
+ * If a signal is not requested, then calls vblank_wait().
+ */
+void DRM(vbl_send_signals)( drm_device_t *dev )
+{
+	struct list_head *list, *tmp;
+	drm_vbl_sig_t *vbl_sig;
+	unsigned int vbl_seq = atomic_read( &dev->vbl_received );
+	unsigned long flags;
+
+	spin_lock_irqsave( &dev->vbl_lock, flags );
+
+	list_for_each_safe( list, tmp, &dev->vbl_sigs.head ) {
+		vbl_sig = list_entry( list, drm_vbl_sig_t, head );
+		if ( ( vbl_seq - vbl_sig->sequence ) <= (1<<23) ) {
+			vbl_sig->info.si_code = vbl_seq;
+			send_sig_info( vbl_sig->info.si_signo, &vbl_sig->info, vbl_sig->task );
+
+			list_del( list );
+
+			DRM_FREE( vbl_sig, sizeof(*vbl_sig) );
+
+			dev->vbl_pending--;
+		}
+	}
+
+	spin_unlock_irqrestore( &dev->vbl_lock, flags );
+}
+
+#endif	/* __HAVE_VBL_IRQ */
+
+#endif /* __HAVE_IRQ */
diff --git a/linux/gamma.h b/linux/gamma.h
index 407eb369..d4712ef2 100644
--- a/linux/gamma.h
+++ b/linux/gamma.h
@@ -108,8 +108,8 @@
 	return 0;							\
 } while (0)
 
-#define __HAVE_DMA_IRQ			1
-#define __HAVE_DMA_IRQ_BH		1
+#define __HAVE_IRQ			1
+#define __HAVE_IRQ_BH			1
 
 #define DRIVER_AGP_BUFFERS_MAP( dev )					\
 	((drm_gamma_private_t *)((dev)->dev_private))->buffers
diff --git a/linux/gamma_dma.c b/linux/gamma_dma.c
index 3fc6c9f8..bae19bbe 100644
--- a/linux/gamma_dma.c
+++ b/linux/gamma_dma.c
@@ -105,7 +105,7 @@ static inline int gamma_dma_is_ready(drm_device_t *dev)
 	return(!GAMMA_READ(GAMMA_DMACOUNT));
 }
 
-irqreturn_t gamma_dma_service( DRM_IRQ_ARGS )
+irqreturn_t gamma_irq_handler( DRM_IRQ_ARGS )
 {
 	drm_device_t	 *dev = (drm_device_t *)arg;
 	drm_device_dma_t *dma = dev->dma;
@@ -253,7 +253,7 @@ static void gamma_dma_timer_bh(unsigned long dev)
 	gamma_dma_schedule((drm_device_t *)dev, 0);
 }
 
-void gamma_dma_immediate_bh(void *dev)
+void gamma_irq_immediate_bh(void *dev)
 {
 	gamma_dma_schedule(dev, 0);
 }
@@ -647,7 +647,7 @@ int gamma_do_cleanup_dma( drm_device_t *dev )
 {
 	DRM_DEBUG( "%s\n", __FUNCTION__ );
 
-#if _HAVE_DMA_IRQ
+#if __HAVE_IRQ
 	/* Make sure interrupts are disabled here because the uninstall ioctl
 	 * may not have been called from userspace and after dev_private
 	 * is freed, it's too late.
diff --git a/linux/gamma_drv.c b/linux/gamma_drv.c
index f1b8b205..b1fb0505 100644
--- a/linux/gamma_drv.c
+++ b/linux/gamma_drv.c
@@ -48,6 +48,7 @@
 #include "drm_fops.h"
 #include "drm_init.h"
 #include "drm_ioctl.h"
+#include "drm_irq.h"
 #include "gamma_lists.h"        /* NOTE */
 #include "drm_lock.h"
 #include "gamma_lock.h"		/* NOTE */
diff --git a/linux/i810.h b/linux/i810.h
index d4098e4d..ffa06c0e 100644
--- a/linux/i810.h
+++ b/linux/i810.h
@@ -119,7 +119,7 @@
  * a noop stub is generated for compatibility.
  */
 /* XXX: Add vblank support? */
-#define __HAVE_DMA_IRQ		0
+#define __HAVE_IRQ		0
 
 /* Buffer customization:
  */
diff --git a/linux/i810_dma.c b/linux/i810_dma.c
index 430ee52d..1eeb4a3f 100644
--- a/linux/i810_dma.c
+++ b/linux/i810_dma.c
@@ -239,7 +239,7 @@ int i810_dma_cleanup(drm_device_t *dev)
 {
 	drm_device_dma_t *dma = dev->dma;
 
-#if _HAVE_DMA_IRQ
+#if __HAVE_IRQ
 	/* Make sure interrupts are disabled here because the uninstall ioctl
 	 * may not have been called from userspace and after dev_private
 	 * is freed, it's too late.
diff --git a/linux/i830.h b/linux/i830.h
index cd770bb5..c0f092ed 100644
--- a/linux/i830.h
+++ b/linux/i830.h
@@ -120,10 +120,10 @@
 #define USE_IRQS 0
 
 #if USE_IRQS
-#define __HAVE_DMA_IRQ		1
+#define __HAVE_IRQ		1
 #define __HAVE_SHARED_IRQ	1
 #else
-#define __HAVE_DMA_IRQ          0
+#define __HAVE_IRQ		0
 #endif
 
 
diff --git a/linux/i830_dma.c b/linux/i830_dma.c
index 48b64d7c..422f3ad5 100644
--- a/linux/i830_dma.c
+++ b/linux/i830_dma.c
@@ -238,7 +238,7 @@ int i830_dma_cleanup(drm_device_t *dev)
 {
 	drm_device_dma_t *dma = dev->dma;
 
-#if _HAVE_DMA_IRQ
+#if __HAVE_IRQ
 	/* Make sure interrupts are disabled here because the uninstall ioctl
 	 * may not have been called from userspace and after dev_private
 	 * is freed, it's too late.
diff --git a/linux/i830_drv.c b/linux/i830_drv.c
index 0735c94d..2f4e8157 100644
--- a/linux/i830_drv.c
+++ b/linux/i830_drv.c
@@ -50,6 +50,7 @@
 #include "drm_fops.h"
 #include "drm_init.h"
 #include "drm_ioctl.h"
+#include "drm_irq.h"
 #include "drm_lock.h"
 #include "drm_memory.h"
 #include "drm_proc.h"
diff --git a/linux/i830_irq.c b/linux/i830_irq.c
index d2aabf33..6d45cda8 100644
--- a/linux/i830_irq.c
+++ b/linux/i830_irq.c
@@ -36,7 +36,7 @@
 #include <linux/delay.h>
 
 
-irqreturn_t DRM(dma_service)( DRM_IRQ_ARGS )
+irqreturn_t DRM(irq_handler)( DRM_IRQ_ARGS )
 {
 	drm_device_t	 *dev = (drm_device_t *)arg;
       	drm_i830_private_t *dev_priv = (drm_i830_private_t *)dev->dev_private;
diff --git a/linux/mga_drv.c b/linux/mga_drv.c
index f0d4935d..6bcad048 100644
--- a/linux/mga_drv.c
+++ b/linux/mga_drv.c
@@ -45,6 +45,7 @@
 #include "drm_fops.h"
 #include "drm_init.h"
 #include "drm_ioctl.h"
+#include "drm_irq.h"
 #include "drm_lock.h"
 #include "drm_memory.h"
 #include "drm_proc.h"
diff --git a/linux/r128_drv.c b/linux/r128_drv.c
index e2e42690..1dee1615 100644
--- a/linux/r128_drv.c
+++ b/linux/r128_drv.c
@@ -47,6 +47,7 @@
 #include "drm_fops.h"
 #include "drm_init.h"
 #include "drm_ioctl.h"
+#include "drm_irq.h"
 #include "drm_lock.h"
 #include "drm_memory.h"
 #include "drm_proc.h"
diff --git a/linux/radeon_drv.c b/linux/radeon_drv.c
index 6152b8a5..74e32df0 100644
--- a/linux/radeon_drv.c
+++ b/linux/radeon_drv.c
@@ -48,6 +48,7 @@
 #include "drm_fops.h"
 #include "drm_init.h"
 #include "drm_ioctl.h"
+#include "drm_irq.h"
 #include "drm_lock.h"
 #include "drm_memory.h"
 #include "drm_proc.h"