linux-kernel - Re: [PATCH 7/7] firmware: imx: sm-misc: Dump syslog and system info

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Message-ID: <20250704102802.GF4525@nxa18884-linux>
Date: Fri, 4 Jul 2025 18:28:02 +0800
From: Peng Fan <peng.fan@....nxp.com>
To: Sudeep Holla <sudeep.holla@....com>
Cc: Peng Fan <peng.fan@....com>,
	Cristian Marussi <cristian.marussi@....com>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, arm-scmi@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/7] firmware: imx: sm-misc: Dump syslog and system info

On Wed, Jul 02, 2025 at 04:22:47PM +0100, Sudeep Holla wrote:
>On Fri, Jun 27, 2025 at 02:03:50PM +0800, Peng Fan wrote:
>> Add sysfs interface to read System Manager syslog and system info
>> 
>> Signed-off-by: Peng Fan <peng.fan@....com>
>> ---
>>  drivers/firmware/imx/sm-misc.c | 97 ++++++++++++++++++++++++++++++++++++++++++
>>  1 file changed, 97 insertions(+)
>> 
>> diff --git a/drivers/firmware/imx/sm-misc.c b/drivers/firmware/imx/sm-misc.c
>> index fc3ee12c2be878e0285183e3381c9514a63d5142..55485a3c4a5c615102a377f41025a6911d746770 100644
>> --- a/drivers/firmware/imx/sm-misc.c
>> +++ b/drivers/firmware/imx/sm-misc.c
>> @@ -44,6 +44,100 @@ static int scmi_imx_misc_ctrl_notifier(struct notifier_block *nb,
>>  	return 0;
>>  }
>>  
>> +static ssize_t syslog_show(struct device *device, struct device_attribute *attr,
>> +			   char *buf)
>> +{
>> +	struct scmi_imx_misc_sys_sleep_rec *rec;
>> +	struct scmi_imx_misc_syslog *syslog;
>> +	int ret;
>> +	size_t len = 0;
>> +
>> +	if (!ph)
>> +		return 0;
>> +
>> +	syslog = kmalloc(sizeof(*syslog), GFP_KERNEL);
>> +	if (!syslog)
>> +		return -ENOMEM;
>> +
>> +	ret = imx_misc_ctrl_ops->misc_syslog(ph, sizeof(*syslog), syslog);
>> +	if (ret) {
>> +		kfree(syslog);
>> +		return ret;
>> +	}
>> +
>> +	rec = &syslog->syssleeprecord;
>> +
>> +	len += sysfs_emit_at(buf, len, "Wake Vector = %u\n", rec->wakesource);
>> +	len += sysfs_emit_at(buf, len, "Sys sleep mode = %u\n", rec->syssleepmode);
>> +	len += sysfs_emit_at(buf, len, "Sys sleep flags = 0x%08x\n", rec->syssleepflags);
>> +	len += sysfs_emit_at(buf, len, "MIX power status = 0x%08x\n", rec->mixpwrstat);
>> +	len += sysfs_emit_at(buf, len, "MEM power status = 0x%08x\n", rec->mempwrstat);
>> +	len += sysfs_emit_at(buf, len, "PLL power status = 0x%08x\n", rec->pllpwrstat);
>> +	len += sysfs_emit_at(buf, len, "Sleep latency = %u\n", rec->sleepentryusec);
>> +	len += sysfs_emit_at(buf, len, "Wake latency = %u\n", rec->sleepexitusec);
>> +	len += sysfs_emit_at(buf, len, "Sleep count = %u\n", rec->sleepcnt);
>> +
>
>Why can't this be individual files and values ?

The System manager firmware provides a command "syslog" to dump
all the information, I just follow same.

With individual files, some values may not be consistent, because
system behaviour may change during reading two files.

Regards,
Peng

>
>-- 
>Regards,
>Sudeep