Hi,
> >> +prlog -n "Checking pstore backend is registered ... "
> >> +be_msg=`dmesg | grep "pstore: Registered [a-zA-Z0-9]\+ as persistent store backend$"`
> >> +if [ $? -eq 0 ]; then
> >> + backend=`echo ${be_msg} | sed -e 's/^.*Registered\ \([a-zA-z0-9-]\+\)\ as.*$/\1/g'`
> >> + prlog "ok"
> >> +else
> >> + prlog "FAIL"
> >> + exit 1
It may be good if you can log "/sys/module/pstore/parameters/backend/"
or /proc/cmdline in failure case.
It makes debug easy.
Seiji
> >> +fi
> -----Original Message-----
> From: 豊岡拓 / Toyooka，Hiraku
> Sent: Tuesday, September 15, 2015 11:31 AM
> To: Kees Cook
> Cc: LKML; Tony Luck; Linux API; Anton Vorontsov; Shuah Khan; Mark Salyzyn; Colin Cross; 阿口誠司 / AGUCHI，SEIJI
> Subject: Re: [PATCH 1/2] selftests/pstore: add pstore test script for pre-reboot
>
> Hello, Kees,
>
> Thank you for your advise.
>
> >> +be_msg=`dmesg | grep "pstore: Registered [a-zA-Z0-9]\+ as
> persistent store backend$"`
> ...
> > This seems unstable if the system hasn't booted recently or if stuff
> > is spamming dmesg. What about examining /sys/module/pstore instead?
>
> OK, I'll update in that way.
>
> Best regards,
> Hiraku Toyooka
>
> Kees Cook wrote:
> > On Tue, Sep 8, 2015 at 4:06 AM, Hiraku Toyooka
> > <hiraku.toyooka.gu@xxxxxxxxxxx> wrote:
> >> The pstore_tests script includes test cases which check pstore's
> >> behavior before crash (and reboot).
> >>
> >> The test cases are currently following.
> >>
> >> - Check pstore backend is registered
> >> - Check pstore console is registered
> >> - Check /dev/pmsg0 exists
> >> - Write string to /dev/pmsg0
> >>
> >> Example usage is following.
> >>
> >> make: Entering directory '/home/root/selftests/pstore'
> >> === Pstore unit tests (pstore_tests)===
> >> Checking pstore backend is registered ... ok
> >> Checking pstore console is registered ... ok
> >> Checking /dev/pmsg0 exists ... ok
> >> Writing TEST_STRING to /dev/pmsg0 ... ok
> >> selftests: pstore_tests [PASS]
> >> === Pstore unit tests (pstore_post_reboot_tests)===
> >> Checking pstore backend is registered ... ok
> >> pstore_crash_test has not been executed yet. we skip further tests.
> >> selftests: pstore_post_reboot_tests [PASS]
> >> make: Leaving directory '/home/root/selftests/pstore'
> >>
> >> We can also see test logs later.
> >>
> >> Signed-off-by: Hiraku Toyooka <hiraku.toyooka.gu@xxxxxxxxxxx>
> >> Cc: Shuah Khan <shuahkh@xxxxxxxxxxxxxxx>
> >> Cc: Tony Luck <tony.luck@xxxxxxxxx>
> >> Cc: Anton Vorontsov <anton@xxxxxxxxxx>
> >> Cc: Colin Cross <ccross@xxxxxxxxxxx>
> >> Cc: Kees Cook <keescook@xxxxxxxxxxxx>
> >> Cc: Mark Salyzyn <salyzyn@xxxxxxxxxxx>
> >> Cc: Seiji Aguchi <seiji.aguchi@xxxxxxx>
> >> Cc: linux-kernel@xxxxxxxxxxxxxxx
> >> Cc: linux-api@xxxxxxxxxxxxxxx
> >> ---
> >> tools/testing/selftests/Makefile | 1 +
> >> tools/testing/selftests/pstore/Makefile | 12 +++++++
> >> tools/testing/selftests/pstore/common_tests | 45 +++++++++++++++++++++++++++
> >> tools/testing/selftests/pstore/pstore_tests | 42 +++++++++++++++++++++++++
> >> 4 files changed, 100 insertions(+)
> >> create mode 100644 tools/testing/selftests/pstore/Makefile
> >> create mode 100755 tools/testing/selftests/pstore/common_tests
> >> create mode 100755 tools/testing/selftests/pstore/pstore_tests
> >>
> >> diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
> >> index 24ae9e8..b58c72e 100644
> >> --- a/tools/testing/selftests/Makefile
> >> +++ b/tools/testing/selftests/Makefile
> >> @@ -12,6 +12,7 @@ TARGETS += mount
> >> TARGETS += mqueue
> >> TARGETS += net
> >> TARGETS += powerpc
> >> +TARGETS += pstore
> >> TARGETS += ptrace
> >> TARGETS += seccomp
> >> TARGETS += size
> >> diff --git a/tools/testing/selftests/pstore/Makefile b/tools/testing/selftests/pstore/Makefile
> >> new file mode 100644
> >> index 0000000..40b887d
> >> --- /dev/null
> >> +++ b/tools/testing/selftests/pstore/Makefile
> >> @@ -0,0 +1,12 @@
> >> +# Makefile for pstore selftests.
> >> +# Expects pstore backend is registered.
> >> +
> >> +all:
> >> +
> >> +TEST_PROGS := pstore_tests
> >> +TEST_FILES := common_tests
> >> +
> >> +include ../lib.mk
> >> +
> >> +clean:
> >> + rm -rf logs/*
> >> diff --git a/tools/testing/selftests/pstore/common_tests b/tools/testing/selftests/pstore/common_tests
> >> new file mode 100755
> >> index 0000000..98611c5
> >> --- /dev/null
> >> +++ b/tools/testing/selftests/pstore/common_tests
> >> @@ -0,0 +1,45 @@
> >> +#!/bin/sh
> >> +
> >> +# common_tests - Shell script commonly used by pstore test scripts
> >> +#
> >> +# Copyright (C) Hitachi Ltd., 2015
> >> +# Written by Hiraku Toyooka <hiraku.toyooka.gu@xxxxxxxxxxx>
> >> +#
> >> +# Released under the terms of the GPL v2.
> >> +
> >> +# Utilities
> >> +errexit() { # message
> >> + echo "Error: $1" 1>&2
> >> + exit 1
> >> +}
> >> +
> >> +absdir() { # file_path
> >> + (cd `dirname $1`; pwd)
> >> +}
> >> +
> >> +# Parameters
> >> +TOP_DIR=`absdir $0`
> >> +LOG_DIR=$TOP_DIR/logs/`date +%Y%m%d-%H%M%S`/
> >> +TEST_STRING="Testing pstore"
> >> +
> >> +# Preparing logs
> >> +LOG_FILE=$LOG_DIR/`basename $0`.log
> >> +mkdir -p $LOG_DIR || errexit "Failed to make a log directory: $LOG_DIR"
> >> +date > $LOG_FILE
> >> +prlog() { # messages
> >> + /bin/echo "$@" | tee -a $LOG_FILE
> >> +}
> >> +prlog "=== Pstore unit tests (`basename $0`)==="
> >> +
> >> +# Starting tests
> >> +rc=0
> >> +
> >> +prlog -n "Checking pstore backend is registered ... "
> >> +be_msg=`dmesg | grep "pstore: Registered [a-zA-Z0-9]\+ as persistent store backend$"`
> >> +if [ $? -eq 0 ]; then
> >> + backend=`echo ${be_msg} | sed -e 's/^.*Registered\ \([a-zA-z0-9-]\+\)\ as.*$/\1/g'`
> >> + prlog "ok"
> >> +else
> >> + prlog "FAIL"
> >> + exit 1
> >> +fi
> >
> > This seems unstable if the system hasn't booted recently or if stuff
> > is spamming dmesg. What about examining /sys/module/pstore instead?
> >
> >> diff --git a/tools/testing/selftests/pstore/pstore_tests b/tools/testing/selftests/pstore/pstore_tests
> >> new file mode 100755
> >> index 0000000..cbf613c
> >> --- /dev/null
> >> +++ b/tools/testing/selftests/pstore/pstore_tests
> >> @@ -0,0 +1,42 @@
> >> +#!/bin/sh
> >> +
> >> +# pstore_tests - Check pstore's behavior before crash/reboot
> >> +#
> >> +# Copyright (C) Hitachi Ltd., 2015
> >> +# Written by Hiraku Toyooka <hiraku.toyooka.gu@xxxxxxxxxxx>
> >> +#
> >> +# Released under the terms of the GPL v2.
> >> +
> >> +. ./common_tests
> >> +
> >> +prlog -n "Checking pstore console is registered ... "
> >> +dmesg | grep -q "console \[pstore"
> >> +if [ $? -eq 0 ]; then
> >> + prlog "ok"
> >> +else
> >> + prlog "FAIL"
> >> +fi
> >> +
> >> +prlog -n "Checking /dev/pmsg0 exists ... "
> >> +if [ -e "/dev/pmsg0" ]; then
> >> + prlog "ok"
> >> +else
> >> + prlog "FAIL"
> >> + rc=1
> >> +fi
> >> +
> >> +prlog -n "Writing TEST_STRING to /dev/pmsg0 ... "
> >> +if [ -e "/dev/pmsg0" ]; then
> >> + echo "${TEST_STRING}" > /dev/pmsg0
> >> + if [ $? -eq 0 ]; then
> >> + prlog "ok"
> >> + else
> >> + prlog "FAIL"
> >> + rc=1
> >> + fi
> >> +else
> >> + prlog "FAIL"
> >> + rc=1
> >> +fi
> >> +
> >> +exit $rc
> >>
> >
> > -Kees
> >
>
> --
> Hiraku Toyooka
> Systems Productivity Research Dept. / Linux Technology Center
> Center for Technology Innovation - Systems Engineering, Hitachi Ltd.
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