Open source GPL/LGPL release

drivers/gpu/nvgpu/common/fence/fence.c

@@ -0,0 +1,120 @@
+/*
+ * Copyright (c) 2014-2020, NVIDIA CORPORATION.  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 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 AUTHORS OR COPYRIGHT HOLDERS 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 <nvgpu/soc.h>
+#include <nvgpu/os_fence.h>
+#include <nvgpu/gk20a.h>
+#include <nvgpu/fence.h>
+#include <nvgpu/user_fence.h>
+#include "fence_priv.h"
+
+static struct nvgpu_fence_type *nvgpu_fence_from_ref(struct nvgpu_ref *ref)
+{
+	return (struct nvgpu_fence_type *)((uintptr_t)ref -
+				offsetof(struct nvgpu_fence_type, priv.ref));
+}
+
+static void nvgpu_fence_release(struct nvgpu_ref *ref)
+{
+	struct nvgpu_fence_type *f = nvgpu_fence_from_ref(ref);
+	struct nvgpu_fence_type_priv *pf = &f->priv;
+
+	if (nvgpu_os_fence_is_initialized(&pf->os_fence)) {
+		pf->os_fence.ops->drop_ref(&pf->os_fence);
+	}
+
+	pf->ops->release(f);
+}
+
+void nvgpu_fence_put(struct nvgpu_fence_type *f)
+{
+	struct nvgpu_fence_type_priv *pf = &f->priv;
+
+	nvgpu_ref_put(&pf->ref, nvgpu_fence_release);
+}
+
+struct nvgpu_fence_type *nvgpu_fence_get(struct nvgpu_fence_type *f)
+{
+	struct nvgpu_fence_type_priv *pf = &f->priv;
+
+	nvgpu_ref_get(&pf->ref);
+	return f;
+}
+
+/*
+ * Extract an object to be passed to the userspace as a result of a submitted
+ * job. This must be balanced with a call to nvgpu_user_fence_release().
+ */
+struct nvgpu_user_fence nvgpu_fence_extract_user(struct nvgpu_fence_type *f)
+{
+	struct nvgpu_fence_type_priv *pf = &f->priv;
+
+	struct nvgpu_user_fence uf = (struct nvgpu_user_fence) {
+#ifdef CONFIG_TEGRA_GK20A_NVHOST
+		.syncpt_id = pf->syncpt_id,
+		.syncpt_value = pf->syncpt_value,
+#endif
+		.os_fence = pf->os_fence,
+	};
+
+	/*
+	 * The os fence member has to live so it can be signaled when the job
+	 * completes. The returned user fence may live longer than that before
+	 * being safely attached to an fd if the job completes before a
+	 * submission ioctl finishes, or if it's stored for cde job state
+	 * tracking.
+	 */
+	if (nvgpu_os_fence_is_initialized(&pf->os_fence)) {
+		pf->os_fence.ops->dup(&pf->os_fence);
+	}
+
+	return uf;
+}
+
+int nvgpu_fence_wait(struct gk20a *g, struct nvgpu_fence_type *f,
+							u32 timeout)
+{
+	struct nvgpu_fence_type_priv *pf = &f->priv;
+
+	if (!nvgpu_platform_is_silicon(g)) {
+		timeout = U32_MAX;
+	}
+	return pf->ops->wait(f, timeout);
+}
+
+bool nvgpu_fence_is_expired(struct nvgpu_fence_type *f)
+{
+	struct nvgpu_fence_type_priv *pf = &f->priv;
+
+	return pf->ops->is_expired(f);
+}
+
+void nvgpu_fence_init(struct nvgpu_fence_type *f,
+		const struct nvgpu_fence_ops *ops,
+		struct nvgpu_os_fence os_fence)
+{
+	struct nvgpu_fence_type_priv *pf = &f->priv;
+
+	nvgpu_ref_init(&pf->ref);
+	pf->ops = ops;
+	pf->os_fence = os_fence;
+}