File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/drivers/gpu/drm/virtio/virtgpu_fence.c b/drivers/gpu/drm/virtio/virtgpu_fence.c
new file mode 100644
index 0000000..cf44187
--- /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, "%llu", (u64)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_ATOMIC);
+ 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);
+}