1 files changed, 97 insertions, 0 deletions
diff --git a/sys/dev/drm/drm_lock.h b/sys/dev/drm/drm_lock.h
new file mode 100644
index 0000000..f093707
--- /dev/null
+++ b/sys/dev/drm/drm_lock.h
@@ -0,0 +1,97 @@
+/* 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>
+ *
+ * $FreeBSD$
+ */
+
+#include "dev/drm/drmP.h"
+
+int DRM(lock_take)(__volatile__ unsigned int *lock, unsigned int context)
+{
+	unsigned int old, new;
+
+	do {
+		old = *lock;
+		if (old & _DRM_LOCK_HELD) new = old | _DRM_LOCK_CONT;
+		else			  new = context | _DRM_LOCK_HELD;
+	} while (!atomic_cmpset_int(lock, old, new));
+
+	if (_DRM_LOCKING_CONTEXT(old) == context) {
+		if (old & _DRM_LOCK_HELD) {
+			if (context != DRM_KERNEL_CONTEXT) {
+				DRM_ERROR("%d holds heavyweight lock\n",
+					  context);
+			}
+			return 0;
+		}
+	}
+	if (new == (context | _DRM_LOCK_HELD)) {
+				/* Have lock */
+		return 1;
+	}
+	return 0;
+}
+
+/* This takes a lock forcibly and hands it to context.	Should ONLY be used
+   inside *_unlock to give lock to kernel before calling *_dma_schedule. */
+int DRM(lock_transfer)(drm_device_t *dev,
+		       __volatile__ unsigned int *lock, unsigned int context)
+{
+	unsigned int old, new;
+
+	dev->lock.filp = NULL;
+	do {
+		old  = *lock;
+		new  = context | _DRM_LOCK_HELD;
+	} while (!atomic_cmpset_int(lock, old, new));
+
+	return 1;
+}
+
+int DRM(lock_free)(drm_device_t *dev,
+		   __volatile__ unsigned int *lock, unsigned int context)
+{
+	unsigned int old, new;
+
+	dev->lock.filp = NULL;
+	do {
+		old  = *lock;
+		new  = 0;
+	} while (!atomic_cmpset_int(lock, old, new));
+
+	if (_DRM_LOCK_IS_HELD(old) && _DRM_LOCKING_CONTEXT(old) != context) {
+		DRM_ERROR("%d freed heavyweight lock held by %d\n",
+			  context, _DRM_LOCKING_CONTEXT(old));
+		return 1;
+	}
+	DRM_WAKEUP_INT((void *)&dev->lock.lock_queue);
+	return 0;
+}
+