Add OCC present count detection and watch

Add a Presence child class of Error to handle detecting the number of
OCCs available. Add an instance of this Presence class if the Device
detects that it is the master OCC, since the number of present OCCs is
only reported by the master OCC. When a change to the number of OCCs
reported is detected, compare with the number of OCCs determined to be
active by the Manager, and if there is a mismatch, follow the usual
error path (reset OCC, etc).

Partially resolves openbmc/openbmc#2285
See https://gerrit.openbmc-project.xyz/#/c/7843/

Change-Id: Idbaca52b307992d9b01fe15439ab746ef6d64397
Signed-off-by: Edward A. James <eajames@us.ibm.com>

1 files changed, 7 insertions, 2 deletions

diff --git a/occ_manager.hpp b/occ_manager.hpp
index 1aaffc8..542c7d9 100644
--- a/occ_manager.hpp
+++ b/occ_manager.hpp
@@ -23,8 +23,8 @@ struct Manager
         Manager() = delete;
         Manager(const Manager&) = delete;
         Manager& operator=(const Manager&) = delete;
-        Manager(Manager&&) = default;
-        Manager& operator=(Manager&&) = default;
+        Manager(Manager&&) = delete;
+        Manager& operator=(Manager&&) = delete;
         ~Manager() = default;
 
         /** @brief Adds OCC pass-through and status objects on the bus
@@ -46,6 +46,11 @@ struct Manager
 #endif
         }
 
+        inline auto getNumOCCs() const
+        {
+            return activeCount;
+        }
+
     private:
         /** @brief Checks if the CPU inventory is present and if so, creates
          *         the occ D-Bus objects. Else, registers a handler to be