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authorMichael Holzheu <holzheu@linux.vnet.ibm.com>2013-04-04 19:49:53 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2013-04-15 13:34:44 +0200
commitb66ac63e20b3f4d7931e67c986956aa5ffbea57f (patch)
treef0da72ef98032f4606f9938d9c6eef56b519b6e2 /arch/s390/kernel
parent41ef2d5678d83af030125550329b6ae8b74618fa (diff)
downloadop-kernel-dev-b66ac63e20b3f4d7931e67c986956aa5ffbea57f.zip
op-kernel-dev-b66ac63e20b3f4d7931e67c986956aa5ffbea57f.tar.gz
s390/kdump: Add PM notifier for kdump
For s390 the page table mapping for the crashkernel memory is removed to protect the pre-loaded kdump kernel and ramdisk. Because the crashkernel memory is not included in the page tables for suspend/resume it is not included in the suspend image. Therefore after resume the resumed system does no longer contain the pre-loaded kdump kernel and when kdump is triggered it fails. This patch adds a PM notifier that creates the page tables before suspend is done and removes them for resume. This ensures that the kdump kernel is included in the suspend image. Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel')
-rw-r--r--arch/s390/kernel/machine_kexec.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/arch/s390/kernel/machine_kexec.c b/arch/s390/kernel/machine_kexec.c
index b3de277..ac21781 100644
--- a/arch/s390/kernel/machine_kexec.c
+++ b/arch/s390/kernel/machine_kexec.c
@@ -13,6 +13,7 @@
#include <linux/reboot.h>
#include <linux/ftrace.h>
#include <linux/debug_locks.h>
+#include <linux/suspend.h>
#include <asm/cio.h>
#include <asm/setup.h>
#include <asm/pgtable.h>
@@ -67,6 +68,35 @@ void setup_regs(void)
memcpy((void *) SAVE_AREA_BASE, (void *) sa, sizeof(struct save_area));
}
+/*
+ * PM notifier callback for kdump
+ */
+static int machine_kdump_pm_cb(struct notifier_block *nb, unsigned long action,
+ void *ptr)
+{
+ switch (action) {
+ case PM_SUSPEND_PREPARE:
+ case PM_HIBERNATION_PREPARE:
+ if (crashk_res.start)
+ crash_map_reserved_pages();
+ break;
+ case PM_POST_SUSPEND:
+ case PM_POST_HIBERNATION:
+ if (crashk_res.start)
+ crash_unmap_reserved_pages();
+ break;
+ default:
+ return NOTIFY_DONE;
+ }
+ return NOTIFY_OK;
+}
+
+static int __init machine_kdump_pm_init(void)
+{
+ pm_notifier(machine_kdump_pm_cb, 0);
+ return 0;
+}
+arch_initcall(machine_kdump_pm_init);
#endif
/*
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