linux-kernel - Re: [PATCH 1/1] selftest: rtc: Add support rtc alarm content check

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Message-ID: <a8f36d5a-a109-4683-abf1-47f8e7f8a7f0@nvidia.com>
Date: Fri, 3 May 2024 19:21:58 +0800
From: Joseph Jang <jjang@...dia.com>
To: Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc: shuah@...nel.org, avagin@...gle.com, amir73il@...il.com,
 brauner@...nel.org, mochs@...dia.com, linux-kernel@...r.kernel.org,
 linux-rtc@...r.kernel.org, linux-kselftest@...r.kernel.org,
 sdonthineni@...dia.com, treding@...dia.com, linux-tegra@...r.kernel.org
Subject: Re: [PATCH 1/1] selftest: rtc: Add support rtc alarm content check

Hi Alexandre,

Thanks for your promptly response, I try to re-send the email again and 
avoid the security scanner to disrupt the external link.


 > procfs for the RTC has been deprecated for a while, don't use it.
 >
 > Instead, you can use the RTC_PARAM_GET ioctl to get RTC_PARAM_FEATURES
 > and then look at RTC_FEATURE_ALARM.

I found old version kernel doesn't support RTC_PARAM_GET ioctl. In order
support old version kernel testing, is it possible to use rtc procfs to
validate wakealarm function for old version kernel ?

Can I move this rtc alarm validation to
<linux_root>/tools/testing/selftests/rtc/rtctest.c ? So we could try to
use RTC_PARAM_GET ioctl first and then roll back to use rtc procfs if 
RTC_PARAM_GET ioctl was not supported.

Thank you,
Joseph.



On 2024/5/3 2:49 PM, Alexandre Belloni wrote:
> On 02/05/2024 18:41:02-0700, Joseph Jang wrote:
>> Some platforms do not support WAKEUP service by default, we use a shell
>> script to check the absence of alarm content in /proc/driver/rtc.
> 
> procfs for the RTC has been deprecated for a while, don't use it.
> 
> Instead, you can use the RTC_PARAM_GET ioctl to get RTC_PARAM_FEATURES
> and then look at RTC_FEATURE_ALARM.
> See https://git.kernel.org/pub/scm/linux/kernel/git/abelloni/rtc-tools.git/tree/rtc.c
> 
>>
>> The script will validate /proc/driver/rtc when it is not empty and then
>> check if could find alarm content in it according to the rtc wakealarm
>> is supported or not.
>>
>> Requires commit 101ca8d05913b ("rtc: efi: Enable SET/GET WAKEUP services
>> as optional")
>>
>> Reviewed-by: Matthew R. Ochs <mochs@...dia.com>
>> Signed-off-by: Joseph Jang <jjang@...dia.com>
>> ---
>>   tools/testing/selftests/Makefile              |  1 +
>>   tools/testing/selftests/rtc/property/Makefile |  5 ++++
>>   .../selftests/rtc/property/rtc-alarm-test.sh  | 27 +++++++++++++++++++
>>   3 files changed, 33 insertions(+)
>>   create mode 100644 tools/testing/selftests/rtc/property/Makefile
>>   create mode 100755 tools/testing/selftests/rtc/property/rtc-alarm-test.sh
>>
>> diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
>> index e1504833654d..f5d43e2132e8 100644
>> --- a/tools/testing/selftests/Makefile
>> +++ b/tools/testing/selftests/Makefile
>> @@ -80,6 +80,7 @@ TARGETS += riscv
>>   TARGETS += rlimits
>>   TARGETS += rseq
>>   TARGETS += rtc
>> +TARGETS += rtc/property
>>   TARGETS += rust
>>   TARGETS += seccomp
>>   TARGETS += sgx
>> diff --git a/tools/testing/selftests/rtc/property/Makefile b/tools/testing/selftests/rtc/property/Makefile
>> new file mode 100644
>> index 000000000000..c6f7aa4f0e29
>> --- /dev/null
>> +++ b/tools/testing/selftests/rtc/property/Makefile
>> @@ -0,0 +1,5 @@
>> +# SPDX-License-Identifier: GPL-2.0
>> +TEST_PROGS := rtc-alarm-test.sh
>> +
>> +include ../../lib.mk
>> +
>> diff --git a/tools/testing/selftests/rtc/property/rtc-alarm-test.sh b/tools/testing/selftests/rtc/property/rtc-alarm-test.sh
>> new file mode 100755
>> index 000000000000..3bee1dd5fbd0
>> --- /dev/null
>> +++ b/tools/testing/selftests/rtc/property/rtc-alarm-test.sh
>> @@ -0,0 +1,27 @@
>> +#!/bin/bash
>> +# SPDX-License-Identifier: GPL-2.0
>> +
>> +if [ ! -f /proc/driver/rtc ]; then
>> +	echo "SKIP: the /proc/driver/rtc is empty."
>> +	exit 4
>> +fi
>> +
>> +# Check if could find alarm content in /proc/driver/rtc according to
>> +# the rtc wakealarm is supported or not.
>> +if [ -n "$(ls /sys/class/rtc/rtc* | grep -i wakealarm)" ]; then
>> +	if [ -n "$(grep -i alarm /proc/driver/rtc)" ]; then
>> +		exit 0
>> +	else
>> +		echo "ERROR: The alarm content is not found."
>> +		cat /proc/driver/rtc
>> +		exit 1
>> +	fi
>> +else
>> +	if [ -n "$(grep -i alarm /proc/driver/rtc)" ]; then
>> +		echo "ERROR: The alarm content is found."
>> +		cat /proc/driver/rtc
>> +		exit 1
>> +	else
>> +		exit 0
>> +	fi
>> +fi
>> -- 
>> 2.34.1
>>
>