1 files changed, 370 insertions, 0 deletions
diff --git a/drivers/char/drm/drm_irq.c b/drivers/char/drm/drm_irq.c
new file mode 100644
index 000000000000..2e236ebcf27b
--- /dev/null
+++ b/drivers/char/drm/drm_irq.c
@@ -0,0 +1,370 @@
+/**
+ * \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.
+ */
+
+#include "drmP.h"
+
+#include <linux/interrupt.h>	/* For task queue support */
+
+/**
+ * Get interrupt from bus id.
+ * 
+ * \param inode device inode.
+ * \param filp file pointer.
+ * \param cmd command.
+ * \param arg user argument, pointing to a drm_irq_busid structure.
+ * \return zero on success or a negative number on failure.
+ * 
+ * Finds the PCI device with the specified bus id and gets its IRQ number.
+ * This IOCTL is deprecated, and will now return EINVAL for any busid not equal
+ * to that of the device that this DRM instance attached to.
+ */
+int drm_irq_by_busid(struct inode *inode, struct file *filp,
+		   unsigned int cmd, unsigned long arg)
+{
+	drm_file_t *priv = filp->private_data;
+	drm_device_t *dev = priv->head->dev;
+	drm_irq_busid_t __user *argp = (void __user *)arg;
+	drm_irq_busid_t p;
+
+	if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
+		return -EINVAL;
+
+	if (copy_from_user(&p, argp, sizeof(p)))
+		return -EFAULT;
+
+	if ((p.busnum >> 8) != dev->pci_domain ||
+	    (p.busnum & 0xff) != dev->pci_bus ||
+	    p.devnum != dev->pci_slot ||
+	    p.funcnum != dev->pci_func)
+		return -EINVAL;
+
+	p.irq = dev->irq;
+
+	DRM_DEBUG("%d:%d:%d => IRQ %d\n",
+		  p.busnum, p.devnum, p.funcnum, p.irq);
+	if (copy_to_user(argp, &p, sizeof(p)))
+		return -EFAULT;
+	return 0;
+}
+
+/**
+ * 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 ret;
+	unsigned long sh_flags=0;
+
+	if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
+		return -EINVAL;
+
+	if ( dev->irq == 0 )
+		return -EINVAL;
+
+	down( &dev->struct_sem );
+
+	/* Driver must have been initialized */
+	if ( !dev->dev_private ) {
+		up( &dev->struct_sem );
+		return -EINVAL;
+	}
+
+	if ( dev->irq_enabled ) {
+		up( &dev->struct_sem );
+		return -EBUSY;
+	}
+	dev->irq_enabled = 1;
+	up( &dev->struct_sem );
+
+	DRM_DEBUG( "%s: irq=%d\n", __FUNCTION__, dev->irq );
+
+	if (drm_core_check_feature(dev, DRIVER_IRQ_VBL)) {
+		init_waitqueue_head(&dev->vbl_queue);
+		
+		spin_lock_init( &dev->vbl_lock );
+		
+		INIT_LIST_HEAD( &dev->vbl_sigs.head );
+		
+		dev->vbl_pending = 0;
+	}
+
+				/* Before installing handler */
+	dev->driver->irq_preinstall(dev);
+
+				/* Install handler */
+	if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED))
+		sh_flags = SA_SHIRQ;
+	
+	ret = request_irq( dev->irq, dev->driver->irq_handler,
+			   sh_flags, dev->devname, dev );
+	if ( ret < 0 ) {
+		down( &dev->struct_sem );
+		dev->irq_enabled = 0;
+		up( &dev->struct_sem );
+		return ret;
+	}
+
+				/* After installing handler */
+	dev->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_enabled;
+
+	if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
+		return -EINVAL;
+
+	down( &dev->struct_sem );
+	irq_enabled = dev->irq_enabled;
+	dev->irq_enabled = 0;
+	up( &dev->struct_sem );
+
+	if ( !irq_enabled )
+		return -EINVAL;
+
+	DRM_DEBUG( "%s: irq=%d\n", __FUNCTION__, dev->irq );
+
+	dev->driver->irq_uninstall(dev);
+
+	free_irq( dev->irq, dev );
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_irq_uninstall);
+
+/**
+ * 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->head->dev;
+	drm_control_t ctl;
+	
+	/* if we haven't irq we fallback for compatibility reasons - this used to be a separate function in drm_dma.h */
+
+	if ( copy_from_user( &ctl, (drm_control_t __user *)arg, sizeof(ctl) ) )
+		return -EFAULT;
+
+	switch ( ctl.func ) {
+	case DRM_INST_HANDLER:
+		if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
+			return 0;
+		if (dev->if_version < DRM_IF_VERSION(1, 2) &&
+		    ctl.irq != dev->irq)
+			return -EINVAL;
+		return drm_irq_install( dev );
+	case DRM_UNINST_HANDLER:
+		if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
+			return 0;
+		return drm_irq_uninstall( dev );
+	default:
+		return -EINVAL;
+	}
+}
+
+/**
+ * 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->head->dev;
+	drm_wait_vblank_t __user *argp = (void __user *)data;
+	drm_wait_vblank_t vblwait;
+	struct timeval now;
+	int ret = 0;
+	unsigned int flags;
+
+	if (!drm_core_check_feature(dev, DRIVER_IRQ_VBL))
+		return -EINVAL;
+
+	if (!dev->irq)
+		return -EINVAL;
+
+	DRM_COPY_FROM_USER_IOCTL( vblwait, argp, 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_alloc( sizeof( drm_vbl_sig_t ), DRM_MEM_DRIVER ) ) ) {
+			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 {
+		if (dev->driver->vblank_wait)
+			ret = dev->driver->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( argp, 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), DRM_MEM_DRIVER );
+
+			dev->vbl_pending--;
+		}
+	}
+
+	spin_unlock_irqrestore( &dev->vbl_lock, flags );
+}
+EXPORT_SYMBOL(drm_vbl_send_signals);
+
+