new file

diff --git a/linux/gamma_lock.h b/linux/gamma_lock.h
new file mode 100644 (file)
index 0000000..1ecbf8f
--- /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;
+}