Find OCC objects
For now, map OCC object per POWER processor.
Add a method that returns a list of OCC objects that need to be on the
bus, based on the processor inventory.
Change-Id: I1dd36b96f71684a1d5866876e4ca9aa0283ef8b0
Signed-off-by: Deepak Kodihalli <dkodihal@in.ibm.com>
diff --git a/Makefile.am b/Makefile.am
index 3b01dfa..2ee9f0f 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,5 +1,10 @@
+# Build these headers, don't install them
+noinst_HEADERS = \
+ occ_finder.hpp
+
sbin_PROGRAMS = openpower-occ-control
openpower_occ_control_SOURCES = \
+ occ_finder.cpp \
app.cpp
openpower_occ_control_LDFLAGS = \
diff --git a/occ_finder.cpp b/occ_finder.cpp
new file mode 100644
index 0000000..8d6391d
--- /dev/null
+++ b/occ_finder.cpp
@@ -0,0 +1,71 @@
+#include <algorithm>
+#include <sdbusplus/server.hpp>
+#include "occ_finder.hpp"
+#include "config.h"
+
+namespace open_power
+{
+namespace occ
+{
+namespace finder
+{
+
+constexpr auto toChar(size_t c)
+{
+ constexpr auto map = "0123";
+ return map[c];
+}
+
+std::vector<std::string> get()
+{
+ auto bus = sdbusplus::bus::new_default();
+ auto mapper =
+ bus.new_method_call(
+ "xyz.openbmc_project.ObjectMapper",
+ "/xyz/openbmc_project/object_mapper",
+ "xyz.openbmc_project.ObjectMapper",
+ "GetSubTreePaths");
+
+ auto depth = 0;
+ mapper.append(std::string(INVENTORY_ROOT));
+ mapper.append(depth);
+ mapper.append(std::vector<std::string>(
+ {std::string(INVENTORY_ITEM_INTERFACE)}));
+
+ auto result = bus.call(mapper);
+ if (result.is_method_error())
+ {
+ throw std::runtime_error("ObjectMapper GetSubTreePaths failed");
+ }
+
+ std::vector<std::string> response;
+ result.read(response);
+ if (response.empty())
+ {
+ throw std::runtime_error("ObjectMapper GetSubTreePaths : bad response");
+ }
+
+ std::vector<std::string> occs;
+ size_t count = 0;
+ std::string cpu = std::string(CPU_NAME) + toChar(count);
+ auto constexpr MAX_PROCS = 4; // Revisit for multi-node systems
+ for (const auto& path: response)
+ {
+ if (std::equal(cpu.crbegin(), cpu.crend(), path.crbegin()))
+ {
+ if(count == MAX_PROCS)
+ {
+ break;
+ }
+ occs.emplace_back(std::string(OCC_NAME) +
+ toChar(count++));
+ }
+ cpu.back() = toChar(count);
+ }
+
+ return occs;
+}
+
+} // namespace finder
+} // namespace occ
+} // namespace open_power
diff --git a/occ_finder.hpp b/occ_finder.hpp
new file mode 100644
index 0000000..2a31b71
--- /dev/null
+++ b/occ_finder.hpp
@@ -0,0 +1,20 @@
+#pragma once
+
+#include <vector>
+#include <string>
+
+namespace open_power
+{
+namespace occ
+{
+namespace finder
+{
+
+/** @brief Get OCC objects on the system by mapping them to processor inventory
+ * @returns list of occ objects, such as occ0, occ1, and so on.
+ */
+std::vector<std::string> get();
+
+} // namespace finder
+} // namespace occ
+} // namespace open_power