1 files changed, 92 insertions, 0 deletions
diff --git a/src/gallium/winsys/g3dvl/nouveau/nouveau_lock.c b/src/gallium/winsys/g3dvl/nouveau/nouveau_lock.c
new file mode 100644
index 0000000000..375634bd05
--- /dev/null
+++ b/src/gallium/winsys/g3dvl/nouveau/nouveau_lock.c
@@ -0,0 +1,92 @@
+/**************************************************************************
+ * 
+ * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * 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, sub license, 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 NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS 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 <pthread.h>
+#include <driclient.h>
+#include "nouveau_context.h"
+#include "nouveau_screen.h"
+
+static pthread_mutex_t lockMutex = PTHREAD_MUTEX_INITIALIZER;
+
+static void
+nouveau_contended_lock(struct nouveau_context *nv, unsigned int flags)
+{
+	dri_drawable_t			*dri_drawable = nv->dri_drawable;
+	dri_screen_t			*dri_screen = nv->dri_context->dri_screen;
+	struct nouveau_screen		*nv_screen = nv->nv_screen;
+	struct nouveau_device		*dev = nv_screen->device;
+	struct nouveau_device_priv	*nvdev = nouveau_device(dev);
+
+	drmGetLock(nvdev->fd, nvdev->ctx, flags);
+
+	/* If the window moved, may need to set a new cliprect now.
+	 *
+	 * NOTE: This releases and regains the hw lock, so all state
+	 * checking must be done *after* this call:
+	 */
+	if (dri_drawable)
+		DRI_VALIDATE_DRAWABLE_INFO(dri_screen, dri_drawable);
+}
+
+/* Lock the hardware and validate our state.
+ */
+void
+LOCK_HARDWARE(struct nouveau_context *nv)
+{
+	struct nouveau_screen		*nv_screen = nv->nv_screen;
+	struct nouveau_device		*dev = nv_screen->device;
+	struct nouveau_device_priv	*nvdev = nouveau_device(dev);
+	char				__ret=0;
+
+	pthread_mutex_lock(&lockMutex);
+	assert(!nv->locked);
+	
+	DRM_CAS(nvdev->lock, nvdev->ctx,
+		(DRM_LOCK_HELD | nvdev->ctx), __ret);
+	
+	if (__ret)
+		nouveau_contended_lock(nv, 0);
+	nv->locked = 1;
+}
+
+
+/* Unlock the hardware using the global current context 
+ */
+void
+UNLOCK_HARDWARE(struct nouveau_context *nv)
+{
+	struct nouveau_screen		*nv_screen = nv->nv_screen;
+	struct nouveau_device		*dev = nv_screen->device;
+	struct nouveau_device_priv	*nvdev = nouveau_device(dev);
+
+	assert(nv->locked);
+	nv->locked = 0;
+
+	DRM_UNLOCK(nvdev->fd, nvdev->lock, nvdev->ctx);
+
+	pthread_mutex_unlock(&lockMutex);
+}