ehea: Add DLPAR memory remove support

The eHEA driver uses the recently modified walk_memory_resource for powerpc
functionality to detect the memory layout. It further uses the memory hotplug
notifiers to catch memory hotplug events.

Signed-off-by: Hannes Hering <hering2@de.ibm.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/drivers/net/ehea/ehea_main.c b/drivers/net/ehea/ehea_main.c
index f9bc21c74b59..d1b6d4e7495d 100644
--- a/drivers/net/ehea/ehea_main.c
+++ b/drivers/net/ehea/ehea_main.c
@@ -35,6 +35,7 @@
 #include <linux/if_ether.h>
 #include <linux/notifier.h>
 #include <linux/reboot.h>
+#include <linux/memory.h>
 #include <asm/kexec.h>
 #include <linux/mutex.h>
 
@@ -3503,6 +3504,24 @@ void ehea_crash_handler(void)
                                               0, H_DEREG_BCMC);
 }
 
+static int ehea_mem_notifier(struct notifier_block *nb,
+                             unsigned long action, void *data)
+{
+        switch (action) {
+        case MEM_OFFLINE:
+                ehea_info("memory has been removed");
+                ehea_rereg_mrs(NULL);
+                break;
+        default:
+                break;
+        }
+        return NOTIFY_OK;
+}
+
+static struct notifier_block ehea_mem_nb = {
+        .notifier_call = ehea_mem_notifier,
+};
+
 static int ehea_reboot_notifier(struct notifier_block *nb,
                                 unsigned long action, void *unused)
 {
@@ -3581,6 +3600,10 @@ int __init ehea_module_init(void)
         if (ret)
                 ehea_info("failed registering reboot notifier");
 
+        ret = register_memory_notifier(&ehea_mem_nb);
+        if (ret)
+                ehea_info("failed registering memory remove notifier");
+
         ret = crash_shutdown_register(&ehea_crash_handler);
         if (ret)
                 ehea_info("failed registering crash handler");
@@ -3604,6 +3627,7 @@ int __init ehea_module_init(void)
 out3:
         ibmebus_unregister_driver(&ehea_driver);
 out2:
+        unregister_memory_notifier(&ehea_mem_nb);
         unregister_reboot_notifier(&ehea_reboot_nb);
         crash_shutdown_unregister(&ehea_crash_handler);
 out:
@@ -3621,6 +3645,7 @@ static void __exit ehea_module_exit(void)
         ret = crash_shutdown_unregister(&ehea_crash_handler);
         if (ret)
                 ehea_info("failed unregistering crash handler");
+        unregister_memory_notifier(&ehea_mem_nb);
         kfree(ehea_fw_handles.arr);
         kfree(ehea_bcmc_regs.arr);
         ehea_destroy_busmap();