linux-kernel - Re: [PATCH V15 03/11] cper: add timestamp print to CPER status printing

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Date:   Fri, 21 Apr 2017 14:21:50 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Tyler Baicar <tbaicar@...eaurora.org>
Cc:     christoffer.dall@...aro.org, marc.zyngier@....com,
        pbonzini@...hat.com, rkrcmar@...hat.com, linux@...linux.org.uk,
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        lenb@...nel.org, matt@...eblueprint.co.uk, robert.moore@...el.com,
        lv.zheng@...el.com, nkaje@...eaurora.org, zjzhang@...eaurora.org,
        mark.rutland@....com, james.morse@....com,
        akpm@...ux-foundation.org, eun.taik.lee@...sung.com,
        sandeepa.s.prabhu@...il.com, labbott@...hat.com,
        shijie.huang@....com, rruigrok@...eaurora.org,
        paul.gortmaker@...driver.com, tn@...ihalf.com, fu.wei@...aro.org,
        rostedt@...dmis.org, bristot@...hat.com,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org, linux-efi@...r.kernel.org,
        devel@...ica.org, Suzuki.Poulose@....com, punit.agrawal@....com,
        astone@...hat.com, harba@...eaurora.org, hanjun.guo@...aro.org,
        john.garry@...wei.com, shiju.jose@...wei.com, joe@...ches.com,
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        xiexiuqi@...wei.com
Subject: Re: [PATCH V15 03/11] cper: add timestamp print to CPER status
 printing

On Tue, Apr 18, 2017 at 05:05:15PM -0600, Tyler Baicar wrote:
> The ACPI 6.1 spec added a timestamp to the HEST generic data

HEST?

I see the timestamp in

Table 18-343 Generic Error Data Entry

where those things are "One or more Generic Error Data Entry structures
may be recorded in the Generic Error Data Entries field of the Generic
Error Status Block structure."

And those are part of the "18.3.2.7 Generic Hardware Error Source",
i.e., GHES. So why do you say "HEST" above?

> structure. Print the timestamp out when printing out the error
> status information.
> 
> Signed-off-by: Tyler Baicar <tbaicar@...eaurora.org>
> CC: Jonathan (Zhixiong) Zhang <zjzhang@...eaurora.org>
> Reviewed-by: James Morse <james.morse@....com>
> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>

Remove those Reviewed-by:s

> ---
>  drivers/firmware/efi/cper.c | 28 ++++++++++++++++++++++++++++
>  1 file changed, 28 insertions(+)
> 
> diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
> index 8328a6f..46585f9 100644
> --- a/drivers/firmware/efi/cper.c
> +++ b/drivers/firmware/efi/cper.c
> @@ -32,6 +32,8 @@
>  #include <linux/acpi.h>
>  #include <linux/pci.h>
>  #include <linux/aer.h>
> +#include <linux/printk.h>
> +#include <linux/bcd.h>
>  #include <acpi/ghes.h>
>  
>  #define INDENT_SP	" "
> @@ -387,6 +389,29 @@ static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie,
>  	pfx, pcie->bridge.secondary_status, pcie->bridge.control);
>  }
>  
> +static void cper_estatus_timestamp(const char *pfx,

cper_print_tstamp()

> +				   struct acpi_hest_generic_data_v300 *gdata)
> +{
> +	__u8 hour, min, sec, day, mon, year, century, *timestamp;
> +
> +	if (gdata->validation_bits & ACPI_HEST_GEN_VALID_TIMESTAMP) {
> +		timestamp = (__u8 *)&(gdata->time_stamp);
> +		sec       = bcd2bin(timestamp[0]);
> +		min       = bcd2bin(timestamp[1]);
> +		hour      = bcd2bin(timestamp[2]);
> +		day       = bcd2bin(timestamp[4]);
> +		mon       = bcd2bin(timestamp[5]);
> +		year      = bcd2bin(timestamp[6]);
> +		century   = bcd2bin(timestamp[7]);
> +
> +		if (*(timestamp + 3) & 0x1)
> +			printk("%stimestamp is precise\n", pfx);
> +
> +		printk("%stime: %02d%02d-%02d-%02d %02d:%02d:%02d\n", pfx,
> +			century, year, mon, day, hour, min, sec);

Yeah, about the precise tstamp, you can do something like this:

---
diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
index 46585f92b741..a649884e2264 100644
--- a/drivers/firmware/efi/cper.c
+++ b/drivers/firmware/efi/cper.c
@@ -404,10 +404,8 @@ static void cper_estatus_timestamp(const char *pfx,
 		year      = bcd2bin(timestamp[6]);
 		century   = bcd2bin(timestamp[7]);
 
-		if (*(timestamp + 3) & 0x1)
-			printk("%stimestamp is precise\n", pfx);
-
-		printk("%stime: %02d%02d-%02d-%02d %02d:%02d:%02d\n", pfx,
+		printk("%s%ststamp: %02d%02d-%02d-%02d %02d:%02d:%02d\n", pfx,
+			(timestamp[3] & 0x1 ? "precise " : ""), 
 			century, year, mon, day, hour, min, sec);
 	}
 }

-- 
Regards/Gruss,
    Boris.

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