linux-kernel - Re: [PATCH 5/5][RFC] selftests/pfru: add test for Platform Firmware Runtime Update and Telemetry

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Date:   Tue, 7 Sep 2021 15:28:52 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Chen Yu <yu.c.chen@...el.com>, linux-acpi@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <len.brown@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Andy Shevchenko <andriy.shevchenko@...el.com>,
        Aubrey Li <aubrey.li@...el.com>,
        Ashok Raj <ashok.raj@...el.com>, Shuah Khan <shuah@...nel.org>,
        linux-kselftest@...r.kernel.org,
        Dou Shengnan <shengnanx.dou@...el.com>,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH 5/5][RFC] selftests/pfru: add test for Platform Firmware
 Runtime Update and Telemetry

On 9/7/21 9:40 AM, Chen Yu wrote:
> Introduce a simple test for Platform Firmware Runtime Update and Telemetry
> drivers. It is based on ioctl to either update firmware driver or code injection,
> and read corresponding PFRU Telemetry log into user space.
> 

A few things to consider and add handling for them in the
test.

What happens when non-root user runs this test?
What happens when the pfru device doesn't exist?


[snip]

> +}
> +
> +int main(int argc, char *argv[])
> +{
> +	int fd_update, fd_log, fd_capsule;
> +	struct telem_data_info data_info;
> +	struct telem_info info;
> +	struct update_cap_info cap;
> +	void *addr_map_capsule;
> +	struct stat st;
> +	char *log_buf;
> +	int ret = 0;
> +
> +	parse_options(argc, argv);
> +
> +	fd_log = open("/dev/pfru/telemetry", O_RDWR);
> +	if (fd_log < 0) {
> +		perror("Cannot open telemetry device...");
> +		return 1;
> +	}

Is this considered an error or unsupported?

> +	fd_update = open("/dev/pfru/update", O_RDWR);
> +	if (fd_update < 0) {
> +		perror("Cannot open code injection device...");
> +		return 1;
> +	}
> +

Same here. If test is run on platform with pfru test should skip
instead of reporting failure/error.

thanks,
-- Shuah