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kdump: Check whether or not to invoke capturing vmcore 

The script dracut-kdump.sh is  responsible for capturing vmcore during
second kernel boot.  Currently this  script  gets installed into kdump
initrd as part of kdumpbase dracut module.

With fadump support, 'dracut-kdump.sh' script also gets installed into
default initrd to capture  vmcore generated by firmware assisted dump.
Thus in fadump case, the  same initrd is  going to be used for  normal
boot as well as boot after system crash. Hence a  check is required to
see if it is a normal boot or boot after crash.

A new node "ibm,kernel-dump" is added, to the device tree, by firmware
to notify kernel if it is booting after crash.  The below patch adds a
check for this node  before executing  steps to  capture vmcore.  This
check will help bypassing  the vmcore capture steps during normal boot
process.

Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: Hari Bathini <hbathini@linux.vnet.ibm.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
This commit is contained in:
Hari Bathini 2014-07-25 00:09:22 +05:30 committed by WANG Chao
parent 5bb5be045c
commit 78589a3207
2 changed files with 10 additions and 1 deletions
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5
dracut-kdump.sh
View File

@ -1,5 +1,10 @@
#!/bin/sh
# continue here only if we have to save dump.
if [ -f /etc/fadump.initramfs ] && [ ! -f /proc/device-tree/rtas/ibm,kernel-dump ]; then
return
fi
exec &> /dev/console
. /lib/dracut-lib.sh
. /lib/kdump-lib.sh

6
kdumpctl
View File

@ -151,8 +151,12 @@ rebuild_fadump_initrd()
# backup fadump initrd for reference before replacing it
backup_initrd
# this file tells the initrd is fadump enabled
touch /tmp/fadump.initramfs
target_initrd_tmp="$TARGET_INITRD.tmp"
$MKDUMPRD $target_initrd_tmp --rebuild $TARGET_INITRD --kver $kdump_kver
$MKDUMPRD $target_initrd_tmp --rebuild $TARGET_INITRD --kver $kdump_kver \
-i /tmp/fadump.initramfs /etc/fadump.initramfs
rm -f /tmp/fadump.initramfs
if [ $? != 0 ]; then
echo "mkdumprd: failed to rebuild initrd with fadump support" >&2
return 1