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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/drivers/misc/ibmasm/heartbeat.c
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/drivers/misc/ibmasm/heartbeat.c')
-rw-r--r--kernel/drivers/misc/ibmasm/heartbeat.c101
1 files changed, 101 insertions, 0 deletions
diff --git a/kernel/drivers/misc/ibmasm/heartbeat.c b/kernel/drivers/misc/ibmasm/heartbeat.c
new file mode 100644
index 000000000..90746378f
--- /dev/null
+++ b/kernel/drivers/misc/ibmasm/heartbeat.c
@@ -0,0 +1,101 @@
+
+/*
+ * IBM ASM Service Processor Device Driver
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Copyright (C) IBM Corporation, 2004
+ *
+ * Author: Max Asböck <amax@us.ibm.com>
+ *
+ */
+
+#include <linux/notifier.h>
+#include "ibmasm.h"
+#include "dot_command.h"
+#include "lowlevel.h"
+
+static int suspend_heartbeats = 0;
+
+/*
+ * Once the driver indicates to the service processor that it is running
+ * - see send_os_state() - the service processor sends periodic heartbeats
+ * to the driver. The driver must respond to the heartbeats or else the OS
+ * will be rebooted.
+ * In the case of a panic the interrupt handler continues to work and thus
+ * continues to respond to heartbeats, making the service processor believe
+ * the OS is still running and thus preventing a reboot.
+ * To prevent this from happening a callback is added the panic_notifier_list.
+ * Before responding to a heartbeat the driver checks if a panic has happened,
+ * if yes it suspends heartbeat, causing the service processor to reboot as
+ * expected.
+ */
+static int panic_happened(struct notifier_block *n, unsigned long val, void *v)
+{
+ suspend_heartbeats = 1;
+ return 0;
+}
+
+static struct notifier_block panic_notifier = { panic_happened, NULL, 1 };
+
+void ibmasm_register_panic_notifier(void)
+{
+ atomic_notifier_chain_register(&panic_notifier_list, &panic_notifier);
+}
+
+void ibmasm_unregister_panic_notifier(void)
+{
+ atomic_notifier_chain_unregister(&panic_notifier_list,
+ &panic_notifier);
+}
+
+
+int ibmasm_heartbeat_init(struct service_processor *sp)
+{
+ sp->heartbeat = ibmasm_new_command(sp, HEARTBEAT_BUFFER_SIZE);
+ if (sp->heartbeat == NULL)
+ return -ENOMEM;
+
+ return 0;
+}
+
+void ibmasm_heartbeat_exit(struct service_processor *sp)
+{
+ char tsbuf[32];
+
+ dbg("%s:%d at %s\n", __func__, __LINE__, get_timestamp(tsbuf));
+ ibmasm_wait_for_response(sp->heartbeat, IBMASM_CMD_TIMEOUT_NORMAL);
+ dbg("%s:%d at %s\n", __func__, __LINE__, get_timestamp(tsbuf));
+ suspend_heartbeats = 1;
+ command_put(sp->heartbeat);
+}
+
+void ibmasm_receive_heartbeat(struct service_processor *sp, void *message, size_t size)
+{
+ struct command *cmd = sp->heartbeat;
+ struct dot_command_header *header = (struct dot_command_header *)cmd->buffer;
+ char tsbuf[32];
+
+ dbg("%s:%d at %s\n", __func__, __LINE__, get_timestamp(tsbuf));
+ if (suspend_heartbeats)
+ return;
+
+ /* return the received dot command to sender */
+ cmd->status = IBMASM_CMD_PENDING;
+ size = min(size, cmd->buffer_size);
+ memcpy_fromio(cmd->buffer, message, size);
+ header->type = sp_write;
+ ibmasm_exec_command(sp, cmd);
+}