From 700e880c3dbaf3532287ad423f3158adbac85fb7 Mon Sep 17 00:00:00 2001
From: Keith Whitwell <keith@tungstengraphics.com>
Date: Tue, 22 Apr 2003 12:07:43 +0000
Subject: [PATCH] new file

---
 linux/gamma_lock.h | 140 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 140 insertions(+)
 create mode 100644 linux/gamma_lock.h

diff --git a/linux/gamma_lock.h b/linux/gamma_lock.h
new file mode 100644
index 00000000..1ecbf8f9
--- /dev/null
+++ b/linux/gamma_lock.h
@@ -0,0 +1,140 @@
+/* lock.c -- IOCTLs for locking -*- linux-c -*-
+ * Created: Tue Feb  2 08:37:54 1999 by faith@valinux.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
+ * 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>
+ */
+
+
+/* Gamma-specific code extracted from drm_lock.h:
+ */
+static int DRM(flush_queue)(drm_device_t *dev, int context)
+{
+	DECLARE_WAITQUEUE(entry, current);
+	int		  ret	= 0;
+	drm_queue_t	  *q	= dev->queuelist[context];
+
+	DRM_DEBUG("\n");
+
+	atomic_inc(&q->use_count);
+	if (atomic_read(&q->use_count) > 1) {
+		atomic_inc(&q->block_write);
+		add_wait_queue(&q->flush_queue, &entry);
+		atomic_inc(&q->block_count);
+		for (;;) {
+			current->state = TASK_INTERRUPTIBLE;
+			if (!DRM_BUFCOUNT(&q->waitlist)) break;
+			schedule();
+			if (signal_pending(current)) {
+				ret = -EINTR; /* Can't restart */
+				break;
+			}
+		}
+		atomic_dec(&q->block_count);
+		current->state = TASK_RUNNING;
+		remove_wait_queue(&q->flush_queue, &entry);
+	}
+	atomic_dec(&q->use_count);
+
+				/* NOTE: block_write is still incremented!
+				   Use drm_flush_unlock_queue to decrement. */
+	return ret;
+}
+
+static int DRM(flush_unblock_queue)(drm_device_t *dev, int context)
+{
+	drm_queue_t	  *q	= dev->queuelist[context];
+
+	DRM_DEBUG("\n");
+
+	atomic_inc(&q->use_count);
+	if (atomic_read(&q->use_count) > 1) {
+		if (atomic_read(&q->block_write)) {
+			atomic_dec(&q->block_write);
+			wake_up_interruptible(&q->write_queue);
+		}
+	}
+	atomic_dec(&q->use_count);
+	return 0;
+}
+
+int DRM(flush_block_and_flush)(drm_device_t *dev, int context,
+			       drm_lock_flags_t flags)
+{
+	int ret = 0;
+	int i;
+
+	DRM_DEBUG("\n");
+
+	if (flags & _DRM_LOCK_FLUSH) {
+		ret = DRM(flush_queue)(dev, DRM_KERNEL_CONTEXT);
+		if (!ret) ret = DRM(flush_queue)(dev, context);
+	}
+	if (flags & _DRM_LOCK_FLUSH_ALL) {
+		for (i = 0; !ret && i < dev->queue_count; i++) {
+			ret = DRM(flush_queue)(dev, i);
+		}
+	}
+	return ret;
+}
+
+int DRM(flush_unblock)(drm_device_t *dev, int context, drm_lock_flags_t flags)
+{
+	int ret = 0;
+	int i;
+
+	DRM_DEBUG("\n");
+
+	if (flags & _DRM_LOCK_FLUSH) {
+		ret = DRM(flush_unblock_queue)(dev, DRM_KERNEL_CONTEXT);
+		if (!ret) ret = DRM(flush_unblock_queue)(dev, context);
+	}
+	if (flags & _DRM_LOCK_FLUSH_ALL) {
+		for (i = 0; !ret && i < dev->queue_count; i++) {
+			ret = DRM(flush_unblock_queue)(dev, i);
+		}
+	}
+
+	return ret;
+}
+
+int DRM(finish)(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;
+	int		  ret	  = 0;
+	drm_lock_t	  lock;
+
+	DRM_DEBUG("\n");
+
+	if (copy_from_user(&lock, (drm_lock_t *)arg, sizeof(lock)))
+		return -EFAULT;
+	ret = DRM(flush_block_and_flush)(dev, lock.context, lock.flags);
+	DRM(flush_unblock)(dev, lock.context, lock.flags);
+	return ret;
+}