1 files changed, 99 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_sw_fence_work.c b/drivers/gpu/drm/i915/i915_sw_fence_work.c
new file mode 100644
index 000000000000..d2e56b387993
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_sw_fence_work.c
@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: MIT
+
+/*
+ * Copyright © 2019 Intel Corporation
+ */
+
+#include "i915_sw_fence_work.h"
+
+static void fence_complete(struct dma_fence_work *f)
+{
+	if (f->ops->release)
+		f->ops->release(f);
+	dma_fence_signal(&f->dma);
+}
+
+static void fence_work(struct work_struct *work)
+{
+	struct dma_fence_work *f = container_of(work, typeof(*f), work);
+
+	f->ops->work(f);
+
+	fence_complete(f);
+	dma_fence_put(&f->dma);
+}
+
+static int
+fence_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
+{
+	struct dma_fence_work *f = container_of(fence, typeof(*f), chain);
+
+	switch (state) {
+	case FENCE_COMPLETE:
+		if (fence->error)
+			dma_fence_set_error(&f->dma, fence->error);
+
+		if (!f->dma.error) {
+			dma_fence_get(&f->dma);
+			if (test_bit(DMA_FENCE_WORK_IMM, &f->dma.flags))
+				fence_work(&f->work);
+			else
+				queue_work(system_unbound_wq, &f->work);
+		} else {
+			fence_complete(f);
+		}
+		break;
+
+	case FENCE_FREE:
+		dma_fence_put(&f->dma);
+		break;
+	}
+
+	return NOTIFY_DONE;
+}
+
+static const char *get_driver_name(struct dma_fence *fence)
+{
+	return "dma-fence";
+}
+
+static const char *get_timeline_name(struct dma_fence *fence)
+{
+	struct dma_fence_work *f = container_of(fence, typeof(*f), dma);
+
+	return f->ops->name ?: "work";
+}
+
+static void fence_release(struct dma_fence *fence)
+{
+	struct dma_fence_work *f = container_of(fence, typeof(*f), dma);
+
+	i915_sw_fence_fini(&f->chain);
+
+	BUILD_BUG_ON(offsetof(typeof(*f), dma));
+	dma_fence_free(&f->dma);
+}
+
+static const struct dma_fence_ops fence_ops = {
+	.get_driver_name = get_driver_name,
+	.get_timeline_name = get_timeline_name,
+	.release = fence_release,
+};
+
+void dma_fence_work_init(struct dma_fence_work *f,
+			 const struct dma_fence_work_ops *ops)
+{
+	f->ops = ops;
+	spin_lock_init(&f->lock);
+	dma_fence_init(&f->dma, &fence_ops, &f->lock, 0, 0);
+	i915_sw_fence_init(&f->chain, fence_notify);
+	INIT_WORK(&f->work, fence_work);
+}
+
+int dma_fence_work_chain(struct dma_fence_work *f, struct dma_fence *signal)
+{
+	if (!signal)
+		return 0;
+
+	return __i915_sw_fence_await_dma_fence(&f->chain, signal, &f->cb);
+}