Implement the stats subsystem in rdci

Add support for the stats subsystem in rdci
Modify the dmon system to handle the case when no GPUs in a group

Change-Id: I5a18e1201d24b5318b8e324a77551a757b108f25

rdci/include/RdciStatsSubSystem.h

@@ -0,0 +1,64 @@
+/*
+Copyright (c) 2020 - present Advanced Micro Devices, 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 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.
+*/
+#ifndef RDCI_INCLUDE_RDCISTATSSUBSYSTEM_H_
+#define RDCI_INCLUDE_RDCISTATSSUBSYSTEM_H_
+#include <signal.h>
+#include <string>
+#include "RdciSubSystem.h"
+
+
+namespace amd {
+namespace rdc {
+
+class RdciStatsSubSystem: public RdciSubSystem {
+ public:
+     RdciStatsSubSystem();
+     ~RdciStatsSubSystem();
+     void parse_cmd_opts(int argc, char ** argv) override;
+     void process() override;
+
+ private:
+     void show_help() const;
+     void show_job_stats(const rdc_gpu_usage_info_t& gpu_info) const;
+
+     enum OPERATIONS {
+        STATS_UNKNOWN = 0,
+        STATS_HELP,
+        STATS_START_RECORDING,
+        STATS_STOP_RECORDING,
+        STATS_DISPLAY,
+        STATS_REMOVE,
+        STATS_REMOVE_ALL
+     } stats_ops_;
+
+
+     std::string job_id_;
+     uint32_t group_id_;
+     bool is_verbose_ = false;
+};
+
+
+}  // namespace rdc
+}  // namespace amd
+
+
+#endif  // RDCI_INCLUDE_RDCISTATSSUBSYSTEM_H_