Remove multithreading while calling enter_mpipl
libpdbg which implements the enter_mpipl is not thread-safe
so removing multithreading and creating processes.
Signed-off-by: Dhruvaraj Subhashchandran <dhruvaraj@in.ibm.com>
Change-Id: I5ca1ff2f203203b387486d9ed410eb4517443474
diff --git a/procedures/common/enter_mpreboot.cpp b/procedures/common/enter_mpreboot.cpp
new file mode 100644
index 0000000..3c6e2e0
--- /dev/null
+++ b/procedures/common/enter_mpreboot.cpp
@@ -0,0 +1,104 @@
+/**
+ * Copyright (C) 2020 IBM Corporation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * 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.
+ */
+
+#include <libpdbg.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#include <phosphor-logging/log.hpp>
+#include <vector>
+
+namespace openpower
+{
+namespace misc
+{
+
+/**
+ * @brief Calls sbe_enter_mpipl on the SBE in the provided target.
+ * @return void
+ */
+void sbeEnterMpReboot(struct pdbg_target* tgt)
+{
+ using namespace phosphor::logging;
+ int error = 0;
+ if ((error = sbe_mpipl_enter(tgt)) < 0)
+ {
+ log<level::ERR>("Failed to initiate memory preserving reboot");
+ // TODO Create a PEL in the future for this failure case.
+ throw std::system_error(error, std::generic_category(),
+ "Failed to initiate memory preserving reboot");
+ }
+}
+
+/**
+ * @brief initiate memory preserving reboot on each SBE.
+ * @return void
+ */
+void enterMpReboot()
+{
+ using namespace phosphor::logging;
+ struct pdbg_target* target;
+ std::vector<pid_t> pidList;
+ bool failed = false;
+ pdbg_targets_init(NULL);
+
+ log<level::INFO>("Starting memory preserving reboot");
+ pdbg_for_each_class_target("pib", target)
+ {
+ if (pdbg_target_probe(target) != PDBG_TARGET_ENABLED)
+ {
+ continue;
+ }
+
+ pid_t pid = fork();
+
+ if (pid < 0)
+ {
+ log<level::ERR>("Fork failed while starting mp reboot");
+ failed = true;
+ }
+ else if (pid == 0)
+ {
+ sbeEnterMpReboot(target);
+ std::exit(EXIT_SUCCESS);
+ }
+ else
+ {
+ pidList.push_back(std::move(pid));
+ }
+ }
+
+ for (auto& p : pidList)
+ {
+ int status = 0;
+ waitpid(p, &status, 0);
+ if (WEXITSTATUS(status))
+ {
+ log<level::ERR>("Memory preserving reboot failed");
+ failed = true;
+ }
+ }
+
+ if (failed)
+ {
+ std::exit(EXIT_FAILURE);
+ }
+}
+
+REGISTER_PROCEDURE("enterMpReboot", enterMpReboot);
+
+} // namespace misc
+} // namespace openpower