selftests/pstore: add pstore test scripts going with reboot

To test pstore in earnest, we have to cause kernel crash and check
pstore filesystem after reboot.

We add two scripts:
 - pstore_crash_test
     This script causes kernel crash and reboot. It is executed by
     'make run_pstore_crash' in selftests. It can also be used with kdump.
 - pstore_post_reboot_tests
     This script includes test cases which check pstore's behavior after
     crash and reboot. It is executed together with pstore_tests by
     'make run_tests [-C pstore]' in selftests.

The test cases in pstore_post_reboot_tests are currently following.

- Check pstore backend is registered
- Mount pstore filesystem
- Check dmesg/console/pmsg files exist in pstore filesystem
- Check dmesg/console files contain oops end marker
- Check pmsg file properly keeps the content written before crash
- Remove all files in pstore filesystem

Example usage is following.

  (before reboot)
  # cd /path/to/selftests
  # make run_tests -C pstore
  === Pstore unit tests (pstore_tests) ===
  UUID=b49b02cf-b0c2-4309-be43-b08c3971e37f
  ...
  selftests: pstore_tests [PASS]
  === Pstore unit tests (pstore_post_reboot_tests) ===
  UUID=953eb1bc-8e03-48d7-b27a-6552b24c5b7e
  Checking pstore backend is registered ... ok
          backend=ramoops
          cmdline=console=ttyS0,115200 root=/dev/mmcblk0p2 rw rootwait mem=768M ramoops.mem_address=0x30000000 ramoops.mem_size=0x10000
  pstore_crash_test has not been executed yet. we skip further tests.
  selftests: pstore_post_reboot_tests [PASS]

  # make run_pstore_crash
  === Pstore unit tests (pstore_crash_test) ===
  UUID=93c8972d-1466-430b-8c4a-28d8681e74c6
  Checking pstore backend is registered ... ok
          backend=ramoops
          cmdline=console=ttyS0,115200 root=/dev/mmcblk0p2 rw rootwait mem=768M ramoops.mem_address=0x30000000 ramoops.mem_size=0x10000
  Causing kernel crash ...
  (kernel crash and reboot)
  ...

  (after reboot)
  # make run_tests -C pstore
  === Pstore unit tests (pstore_tests) ===
  UUID=8e511e77-2285-499f-8bc0-900d9af1fbcc
  ...
  selftests: pstore_tests [PASS]
  === Pstore unit tests (pstore_post_reboot_tests) ===
  UUID=2dcc2132-4f3c-45aa-a38f-3b54bff8cef1
  Checking pstore backend is registered ... ok
          backend=ramoops
          cmdline=console=ttyS0,115200 root=/dev/mmcblk0p2 rw rootwait mem=768M ramoops.mem_address=0x30000000 ramoops.mem_size=0x10000
  Mounting pstore filesystem ... ok
  Checking dmesg files exist in pstore filesystem ... ok
          dmesg-ramoops-0
          dmesg-ramoops-1
  Checking console files exist in pstore filesystem ... ok
          console-ramoops-0
  Checking pmsg files exist in pstore filesystem ... ok
          pmsg-ramoops-0
  Checking dmesg files contain oops end marker
          dmesg-ramoops-0 ... ok
          dmesg-ramoops-1 ... ok
  Checking console file contains oops end marker ... ok
  Checking pmsg file properly keeps the content written before crash ... ok
  Removing all files in pstore filesystem
          console-ramoops-0 ... ok
          dmesg-ramoops-0 ... ok
          dmesg-ramoops-1 ... ok
          pmsg-ramoops-0 ... ok
  selftests: pstore_post_reboot_tests [PASS]

Signed-off-by: Hiraku Toyooka <hiraku.toyooka.gu@hitachi.com>
Cc: Shuah Khan <shuahkh@osg.samsung.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Anton Vorontsov <anton@enomsg.org>
Cc: Colin Cross <ccross@android.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Mark Salyzyn <salyzyn@android.com>
Cc: Seiji Aguchi <seiji.aguchi.tr@hitachi.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-api@vger.kernel.org
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/tools/testing/selftests/pstore/pstore_crash_test b/tools/testing/selftests/pstore/pstore_crash_test
new file mode 100755
index 000000000000..1a4afe5c12b6
--- /dev/null
+++ b/tools/testing/selftests/pstore/pstore_crash_test
@@ -0,0 +1,30 @@
+#!/bin/sh
+
+# pstore_crash_test - Pstore test shell script which causes crash and reboot
+#
+# Copyright (C) Hitachi Ltd., 2015
+#  Written by Hiraku Toyooka <hiraku.toyooka.gu@hitachi.com>
+#
+# Released under the terms of the GPL v2.
+
+# exit if pstore backend is not registered
+. ./common_tests
+
+prlog "Causing kernel crash ..."
+
+# enable all functions triggered by sysrq
+echo 1 > /proc/sys/kernel/sysrq
+# setting to reboot in 3 seconds after panic
+echo 3 > /proc/sys/kernel/panic
+
+# save uuid file by different name because next test execution will replace it.
+mv $TOP_DIR/uuid $TOP_DIR/prev_uuid
+
+# create a file as reboot flag
+touch $REBOOT_FLAG
+sync
+
+# cause crash
+# Note: If you use kdump and want to see kmesg-* files after reboot, you should
+#       specify 'crash_kexec_post_notifiers' in 1st kernel's cmdline.
+echo c > /proc/sysrq-trigger