linux-kernel - Re: [PATCH 1/2] selftest: rtc: Add to check rtc alarm status for alarm related test

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Message-ID: <c900db54-d764-4389-ad9a-bc2be61eedd2@nvidia.com>
Date: Fri, 18 Oct 2024 12:26:44 +0800
From: Joseph Jang <jjang@...dia.com>
To: Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc: "shuah@...nel.org" <shuah@...nel.org>,
 "avagin@...gle.com" <avagin@...gle.com>,
 "amir73il@...il.com" <amir73il@...il.com>,
 "brauner@...nel.org" <brauner@...nel.org>, Matt Ochs <mochs@...dia.com>,
 Koba Ko <kobak@...dia.com>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "linux-rtc@...r.kernel.org" <linux-rtc@...r.kernel.org>,
 "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
 "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH 1/2] selftest: rtc: Add to check rtc alarm status for
 alarm related test



On 2024/6/24 9:43 AM, Joseph Jang wrote:
> 
> 
> On 2024/6/21 3:36 AM, Alexandre Belloni wrote:
>> On 23/05/2024 18:38:06-0700, Joseph Jang wrote:
>>> In alarm_wkalm_set and alarm_wkalm_set_minute test, they use different
>>> ioctl (RTC_ALM_SET/RTC_WKALM_SET) for alarm feature detection. They will
>>> skip testing if RTC_ALM_SET/RTC_WKALM_SET ioctl returns an EINVAL error
>>> code. This design may miss detecting real problems when the
>>> efi.set_wakeup_time() return errors and then RTC_ALM_SET/RTC_WKALM_SET
>>> ioctl returns an EINVAL error code with RTC_FEATURE_ALARM enabled.
>>>
>>> In order to make rtctest more explicit and robust, we propose to use
>>> RTC_PARAM_GET ioctl interface to check rtc alarm feature state before
>>> running alarm related tests. If the kernel does not support RTC_PARAM_GET
>>> ioctl interface, we will fallback to check the error number of
>>> (RTC_ALM_SET/RTC_WKALM_SET) ioctl call for alarm feature detection.
>>>
>>> Requires commit 101ca8d05913b ("rtc: efi: Enable SET/GET WAKEUP services
>>> as optional")
>>>
>>> Reviewed-by: Koba Ko <kobak@...dia.com>
>>> Reviewed-by: Matthew R. Ochs <mochs@...dia.com>
>>> Signed-off-by: Joseph Jang <jjang@...dia.com>
>>> ---
>>>    tools/testing/selftests/rtc/Makefile  |  2 +-
>>>    tools/testing/selftests/rtc/rtctest.c | 64 +++++++++++++++++++++++++++
>>>    2 files changed, 65 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/tools/testing/selftests/rtc/Makefile b/tools/testing/selftests/rtc/Makefile
>>> index 55198ecc04db..6e3a98fb24ba 100644
>>> --- a/tools/testing/selftests/rtc/Makefile
>>> +++ b/tools/testing/selftests/rtc/Makefile
>>> @@ -1,5 +1,5 @@
>>>    # SPDX-License-Identifier: GPL-2.0
>>> -CFLAGS += -O3 -Wl,-no-as-needed -Wall
>>> +CFLAGS += -O3 -Wl,-no-as-needed -Wall -I../../../../usr/include/
>>
>> Is this change actually needed?
> 
> If we didn't include "-I../../../../usr/include/" in rtctest Makefile,
> we may encounter build errors like the following because rtctest default
> look at the header file from /usr/include/linux/rtc.h which miss the
> definition of struct rtc_param, RTC_PARAM_FEATURES and RTC_PARAM_GET.
> 
> rtctest.c: In function ‘get_rtc_alarm_state’:
> rtctest.c:94:15: error: variable ‘param’ has initializer but incomplete
> type
>      94 |        struct rtc_param param = { 0 };
>         |               ^~~~~~~~~
> rtctest.c:94:35: warning: excess elements in struct initializer
>      94 |        struct rtc_param param = { 0 };
>         |                                   ^
> rtctest.c:94:35: note: (near initialization for ‘param’)
> rtctest.c:94:25: error: storage size of ‘param’ isn’t known
>      94 |        struct rtc_param param = { 0 };
>         |                         ^~~~~
> rtctest.c:98:22: error: ‘RTC_PARAM_FEATURES’ undeclared (first use in
> this function)
>      98 |        param.param = RTC_PARAM_FEATURES;
>         |                      ^~~~~~~~~~~~~~~~~~
> rtctest.c:98:22: note: each undeclared identifier is reported only once
> for each function it appears in
> rtctest.c:100:23: error: ‘RTC_PARAM_GET’ undeclared (first use in this
> function); did you mean ‘RTC_ALM_SET’?
>     100 |        rc = ioctl(fd, RTC_PARAM_GET, &param);
>         |                       ^~~~~~~~~~~~~
>         |                       RTC_ALM_SET
> 
> After adding "-I../../../../usr/include/", the rtctest will look at
> linux kernel source header files from
> <Linux root directory>/usr/include/linux/rtc.h to find the definition of
> struct rtc_param, RTC_PARAM_FEATURES and RTC_PARAM_GET and fix the
> rtctest build errors.
> 
> 
> Thank you,
> Joseph.
> 
>  >
Hi Alexandre,

Thank you for reviewing the kernel patch [PATCH 1/2].
We are still not sure if we could include linux headers files from 
kernel source directory by the following change ?

-CFLAGS += -O3 -Wl,-no-as-needed -Wall
+CFLAGS += -O3 -Wl,-no-as-needed -Wall -I../../../../usr/include/

Thank you,
Joseph.