[magma] Add connection and context
This change adds basic scaffolding for connection and context objects.
Bug: b/272307395
Test: m libgfxstream_backend
Change-Id: I8dd1aea47ab273ca2f592ef309519c4137c42a71
diff --git a/host/magma/Connection.h b/host/magma/Connection.h
new file mode 100644
index 0000000..429f16c
--- /dev/null
+++ b/host/magma/Connection.h
@@ -0,0 +1,54 @@
+// Copyright (C) 2023 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License") override;
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+
+#include <memory>
+#include <optional>
+#include <unordered_map>
+
+#include "DrmContext.h"
+
+namespace gfxstream {
+namespace magma {
+
+class DrmDevice;
+
+// A Connection represents an unique magma object ID namespace.
+// Magma objects from different connections may share the same ID.
+class Connection {
+ public:
+ Connection(DrmDevice& device);
+ ~Connection() = default;
+ DISALLOW_COPY_AND_ASSIGN(Connection);
+ Connection(Connection&&) noexcept = default;
+ Connection& operator=(Connection&&) = delete;
+
+ // Creates a new context and returns its ID. Returns nullopt on error.
+ std::optional<uint32_t> createContext();
+
+ // Returns the context for the given ID, or nullptr if invalid.
+ DrmContext* getContext(uint32_t id);
+
+ private:
+ friend class DrmContext;
+
+ DrmDevice& mDevice;
+
+ // Maps context IDs to contexts.
+ std::unordered_map<uint32_t, DrmContext> mContexts;
+};
+
+} // namespace magma
+} // namespace gfxstream
