powerpc/eeh: Disable EEH on reboot

We possiblly detect EEH errors during reboot, particularly in kexec
path, but it's impossible for device drivers and EEH core to handle
or recover them properly.

The patch registers one reboot notifier for EEH and disable EEH
subsystem during reboot. That means the EEH errors is going to be
cleared by hardware reset or second kernel during early stage of
PCI probe.

Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 20 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/eeh.c b/arch/powerpc/kernel/eeh.c
index f22f7b6f6b01..e7b76a6bf150 100644
--- a/arch/powerpc/kernel/eeh.c
+++ b/arch/powerpc/kernel/eeh.c
@@ -28,6 +28,7 @@
 #include <linux/pci.h>
 #include <linux/proc_fs.h>
 #include <linux/rbtree.h>
+#include <linux/reboot.h>
 #include <linux/seq_file.h>
 #include <linux/spinlock.h>
 #include <linux/export.h>
@@ -747,6 +748,17 @@ int __exit eeh_ops_unregister(const char *name)
         return -EEXIST;
 }
 
+static int eeh_reboot_notifier(struct notifier_block *nb,
+                               unsigned long action, void *unused)
+{
+        eeh_set_enable(false);
+        return NOTIFY_DONE;
+}
+
+static struct notifier_block eeh_reboot_nb = {
+        .notifier_call = eeh_reboot_notifier,
+};
+
 /**
  * eeh_init - EEH initialization
  *
@@ -778,6 +790,14 @@ int eeh_init(void)
         if (machine_is(powernv) && cnt++ <= 0)
                 return ret;
 
+        /* Register reboot notifier */
+        ret = register_reboot_notifier(&eeh_reboot_nb);
+        if (ret) {
+                pr_warn("%s: Failed to register notifier (%d)\n",
+                        __func__, ret);
+                return ret;
+        }
+
         /* call platform initialization function */
         if (!eeh_ops) {
                 pr_warning("%s: Platform EEH operation not found\n",