1 files changed, 99 insertions, 0 deletions
diff --git a/linux-core/radeon_fence.c b/linux-core/radeon_fence.c
new file mode 100644
index 00000000..13af804b
--- /dev/null
+++ b/linux-core/radeon_fence.c
@@ -0,0 +1,99 @@
+/**************************************************************************
+ * 
+ * Copyright 2006 Tungsten Graphics, Inc., Bismarck, ND., USA
+ * 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 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
+ * THE COPYRIGHT HOLDERS, AUTHORS 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.
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ * 
+ * 
+ **************************************************************************/
+/*
+ * Authors: Thomas Hellström <thomas-at-tungstengraphics-dot-com>
+ */
+
+#include "drmP.h"
+#include "drm.h"
+#include "radeon_drm.h"
+#include "radeon_drv.h"
+
+int radeon_fence_emit_sequence(struct drm_device *dev, uint32_t class,
+			       uint32_t flags, uint32_t *sequence,
+			       uint32_t *native_type)
+{
+	struct drm_radeon_private *dev_priv = (struct drm_radeon_private *) dev->dev_private;
+
+	if (!dev_priv)
+		return -EINVAL;
+
+	radeon_emit_irq(dev);
+
+	DRM_DEBUG("emitting %d\n", dev_priv->counter);
+	*sequence = (uint32_t) dev_priv->counter;
+	*native_type = DRM_FENCE_TYPE_EXE;
+
+	return 0;
+}
+
+static void radeon_fence_poll(struct drm_device *dev, uint32_t fence_class,
+			      uint32_t waiting_types)
+{
+	struct drm_radeon_private *dev_priv = (struct drm_radeon_private *) dev->dev_private;
+	uint32_t sequence;
+
+	sequence = RADEON_READ(RADEON_SCRATCH_REG3);
+	/* this used to be READ_BREADCRUMB(dev_priv); but it caused
+	 * a race somewhere in the fencing irq
+	 */
+
+	DRM_DEBUG("polling %d\n", sequence);
+	drm_fence_handler(dev, 0, sequence,
+       			  DRM_FENCE_TYPE_EXE, 0);
+}
+
+void radeon_fence_handler(struct drm_device * dev)
+{
+	struct drm_fence_manager *fm = &dev->fm;
+	struct drm_fence_class_manager *fc = &fm->fence_class[0];
+
+	write_lock(&fm->lock);
+	radeon_fence_poll(dev, 0, fc->waiting_types);
+	write_unlock(&fm->lock);
+}
+
+int radeon_fence_has_irq(struct drm_device *dev, uint32_t class, uint32_t flags)
+{
+	/*
+	 * We have an irq that tells us when we have a new breadcrumb.
+	 */
+	return 1;
+}
+
+
+struct drm_fence_driver radeon_fence_driver = {
+	.num_classes = 1,
+	.wrap_diff = (1U << (BREADCRUMB_BITS -1)),
+	.flush_diff = (1U << (BREADCRUMB_BITS - 2)),
+	.sequence_mask = BREADCRUMB_MASK,
+	.emit = radeon_fence_emit_sequence,
+	.has_irq = radeon_fence_has_irq,
+	.poll = radeon_fence_poll,
+};
+