linux-kernel - Re: [PATCH v3] EDAC/ghes: Setup DIMM label from DMI and use it in error reports

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Date:   Tue, 19 May 2020 22:25:35 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Robert Richter <rrichter@...vell.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Tony Luck <tony.luck@...el.com>,
        James Morse <james.morse@....com>,
        Aristeu Rozanski <aris@...hat.com>,
        Matthias Brugger <mbrugger@...e.com>,
        linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] EDAC/ghes: Setup DIMM label from DMI and use it in
 error reports

On Mon, May 18, 2020 at 11:58:52AM +0200, Robert Richter wrote:
> +static void dimm_setup_label(struct dimm_info *dimm, u16 handle)
> +{
> +	const char *bank = NULL, *device = NULL;
> +
> +	dmi_memdev_name(handle, &bank, &device);
> +
> +	/* both strings must be non-zero */
> +	if (bank && *bank && device && *device)
> +		snprintf(dimm->label, sizeof(dimm->label),
> +			"%s %s", bank, device);
> +	else
> +		snprintf(dimm->label, sizeof(dimm->label),
> +			"unknown memory (handle: 0x%.4x)", handle);

This changes the sysfs strings on my test box like this. 00-ghes.before
and 01-ghes.after are created by doing:

grep -EriIn . /sys/devices/system/edac/ 2>/dev/null > [filename]

edac_mc_alloc_dimms() already sets the dimm->label to "mc#%dmemory#%d"
but I'm guessing that dmi_memdev_name() doesn't give on my machine what
it gives on yours.

Welcome to the wonderful world of consistently implemented firmware!

--- 00-ghes.before      2020-05-19 17:55:50.821220239 +0200
+++ 01-ghes.after       2020-05-19 22:09:28.808492701 +0200
@@ -17,7 +17,7 @@
 /sys/devices/system/edac/mc/mc0/ce_count:1:0
 /sys/devices/system/edac/mc/mc0/mc_name:1:ghes_edac
 /sys/devices/system/edac/mc/mc0/csrow15/ce_count:1:0
-/sys/devices/system/edac/mc/mc0/csrow15/ch0_dimm_label:1:mc#0memory#15
+/sys/devices/system/edac/mc/mc0/csrow15/ch0_dimm_label:1:unknown memory (handle: 0x0030)
 /sys/devices/system/edac/mc/mc0/csrow15/power/runtime_active_time:1:0
 /sys/devices/system/edac/mc/mc0/csrow15/power/runtime_active_kids:1:0
 /sys/devices/system/edac/mc/mc0/csrow15/power/runtime_usage:1:0
@@ -42,7 +42,7 @@
 /sys/devices/system/edac/mc/mc0/power/runtime_enabled:1:disabled & forbidden
 /sys/devices/system/edac/mc/mc0/power/control:1:on
 /sys/devices/system/edac/mc/mc0/csrow31/ce_count:1:0
-/sys/devices/system/edac/mc/mc0/csrow31/ch0_dimm_label:1:mc#0memory#31
+/sys/devices/system/edac/mc/mc0/csrow31/ch0_dimm_label:1:unknown memory (handle: 0x0040)
 /sys/devices/system/edac/mc/mc0/csrow31/power/runtime_active_time:1:0
 /sys/devices/system/edac/mc/mc0/csrow31/power/runtime_active_kids:1:0
 /sys/devices/system/edac/mc/mc0/csrow31/power/runtime_usage:1:0
@@ -73,10 +73,10 @@
 /sys/devices/system/edac/mc/mc0/dimm15/dimm_dev_type:1:Unknown
 /sys/devices/system/edac/mc/mc0/dimm15/size:1:32768
 /sys/devices/system/edac/mc/mc0/dimm15/dimm_ce_count:1:0
-/sys/devices/system/edac/mc/mc0/dimm15/dimm_label:1:mc#0memory#15
+/sys/devices/system/edac/mc/mc0/dimm15/dimm_label:1:unknown memory (handle: 0x0030)
 /sys/devices/system/edac/mc/mc0/dimm15/dimm_location:1:memory 15 
 /sys/devices/system/edac/mc/mc0/dimm15/dimm_edac_mode:1:SECDED
-/sys/devices/system/edac/mc/mc0/seconds_since_reset:1:354
+/sys/devices/system/edac/mc/mc0/seconds_since_reset:1:979
 /sys/devices/system/edac/mc/mc0/dimm31/dimm_ue_count:1:0
 /sys/devices/system/edac/mc/mc0/dimm31/dimm_mem_type:1:Registered-DDR4
 /sys/devices/system/edac/mc/mc0/dimm31/power/runtime_active_time:1:0
@@ -90,7 +90,7 @@
 /sys/devices/system/edac/mc/mc0/dimm31/dimm_dev_type:1:Unknown
 /sys/devices/system/edac/mc/mc0/dimm31/size:1:32768
 /sys/devices/system/edac/mc/mc0/dimm31/dimm_ce_count:1:0
-/sys/devices/system/edac/mc/mc0/dimm31/dimm_label:1:mc#0memory#31
+/sys/devices/system/edac/mc/mc0/dimm31/dimm_label:1:unknown memory (handle: 0x0040)
 /sys/devices/system/edac/mc/mc0/dimm31/dimm_location:1:memory 31 
 /sys/devices/system/edac/mc/mc0/dimm31/dimm_edac_mode:1:SECDED
 /sys/devices/system/edac/mc/mc0/max_location:1:memory 31

-- 
Regards/Gruss,
    Boris.

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