1 files changed, 119 insertions, 0 deletions
diff --git a/drivers/gpu/drm/virtio/virtgpu_fence.c b/drivers/gpu/drm/virtio/virtgpu_fence.c
new file mode 100644
index 000000000000..1da632631dac
--- /dev/null
+++ b/drivers/gpu/drm/virtio/virtgpu_fence.c
@@ -0,0 +1,119 @@
+/*
+ * Copyright (C) 2015 Red Hat, Inc.
+ * 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 THE COPYRIGHT OWNER(S) 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 <drm/drmP.h>
+#include "virtgpu_drv.h"
+
+static const char *virtio_get_driver_name(struct fence *f)
+{
+	return "virtio_gpu";
+}
+
+static const char *virtio_get_timeline_name(struct fence *f)
+{
+	return "controlq";
+}
+
+static bool virtio_enable_signaling(struct fence *f)
+{
+	return true;
+}
+
+static bool virtio_signaled(struct fence *f)
+{
+	struct virtio_gpu_fence *fence = to_virtio_fence(f);
+
+	if (atomic64_read(&fence->drv->last_seq) >= fence->seq)
+		return true;
+	return false;
+}
+
+static void virtio_fence_value_str(struct fence *f, char *str, int size)
+{
+	struct virtio_gpu_fence *fence = to_virtio_fence(f);
+
+	snprintf(str, size, "%llu", fence->seq);
+}
+
+static void virtio_timeline_value_str(struct fence *f, char *str, int size)
+{
+	struct virtio_gpu_fence *fence = to_virtio_fence(f);
+
+	snprintf(str, size, "%lu", atomic64_read(&fence->drv->last_seq));
+}
+
+static const struct fence_ops virtio_fence_ops = {
+	.get_driver_name     = virtio_get_driver_name,
+	.get_timeline_name   = virtio_get_timeline_name,
+	.enable_signaling    = virtio_enable_signaling,
+	.signaled            = virtio_signaled,
+	.wait                = fence_default_wait,
+	.fence_value_str     = virtio_fence_value_str,
+	.timeline_value_str  = virtio_timeline_value_str,
+};
+
+int virtio_gpu_fence_emit(struct virtio_gpu_device *vgdev,
+			  struct virtio_gpu_ctrl_hdr *cmd_hdr,
+			  struct virtio_gpu_fence **fence)
+{
+	struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv;
+	unsigned long irq_flags;
+
+	*fence = kmalloc(sizeof(struct virtio_gpu_fence), GFP_KERNEL);
+	if ((*fence) == NULL)
+		return -ENOMEM;
+
+	spin_lock_irqsave(&drv->lock, irq_flags);
+	(*fence)->drv = drv;
+	(*fence)->seq = ++drv->sync_seq;
+	fence_init(&(*fence)->f, &virtio_fence_ops, &drv->lock,
+		   0, (*fence)->seq);
+	fence_get(&(*fence)->f);
+	list_add_tail(&(*fence)->node, &drv->fences);
+	spin_unlock_irqrestore(&drv->lock, irq_flags);
+
+	cmd_hdr->flags |= cpu_to_le32(VIRTIO_GPU_FLAG_FENCE);
+	cmd_hdr->fence_id = cpu_to_le64((*fence)->seq);
+	return 0;
+}
+
+void virtio_gpu_fence_event_process(struct virtio_gpu_device *vgdev,
+				    u64 last_seq)
+{
+	struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv;
+	struct virtio_gpu_fence *fence, *tmp;
+	unsigned long irq_flags;
+
+	spin_lock_irqsave(&drv->lock, irq_flags);
+	atomic64_set(&vgdev->fence_drv.last_seq, last_seq);
+	list_for_each_entry_safe(fence, tmp, &drv->fences, node) {
+		if (last_seq < fence->seq)
+			continue;
+		fence_signal_locked(&fence->f);
+		list_del(&fence->node);
+		fence_put(&fence->f);
+	}
+	spin_unlock_irqrestore(&drv->lock, irq_flags);
+}