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Date: Mon, 14 May 2012 14:48:08 +0200
From: Borislav Petkov <bp@...64.org>
To: Mauro Carvalho Chehab <mchehab@...hat.com>
Cc: Linux Edac Mailing List <linux-edac@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Doug Thompson <norsk5@...oo.com>
Subject: Re: [EDAC ABI v13 01/25] edac: Initialize the dimm label with the
known information
Review comments to the one below are still not addressed, maybe slipped
through the cracks?
On Mon, May 07, 2012 at 05:52:26PM +0200, Borislav Petkov wrote:
> Adding latest version here:
>
> > From 50e9a89aad7045909780d635d73ab2893f8c1f90 Mon Sep 17 00:00:00 2001
> > From: Mauro Carvalho Chehab <mchehab@...hat.com>
> > Date: Thu, 9 Feb 2012 11:05:20 -0300
> > Subject: [PATCH] edac: Initialize the dimm label with the known information
> >
> > While userspace doesn't fill the dimm labels, add there the dimm location,
> > as described by the used memory model. This could eventually match what
> > is described at the dmidecode, making easier for people to identify the
>
> in making it easier
>
> > memory.
>
> stick in error.
>
> > For example, on an Intel motherboard, the memory is described as:
> >
> > Memory Device
> > Array Handle: 0x0029
> > Error Information Handle: Not Provided
> > Total Width: 64 bits
> > Data Width: 64 bits
> > Size: 2048 MB
> > Form Factor: DIMM
> > Set: 1
> > Locator: A1_DIMM0
> > Bank Locator: A1_Node0_Channel0_Dimm0
> > Type: <OUT OF SPEC>
> > Type Detail: Synchronous
> > Speed: 800 MHz
> > Manufacturer: A1_Manufacturer0
> > Serial Number: A1_SerNum0
> > Asset Tag: A1_AssetTagNum0
> > Part Number: A1_PartNum0
> >
> > After this patch, the memory label will be filled with:
> > /sys/devices/system/edac/mc/mc0/dimm0/dimm_label:mc#0channel#0slot#0
>
> This is only with the Intel-MCs, right, I still have the csrows here:
>
> tree /sys/devices/system/edac/mc/
> /sys/devices/system/edac/mc/
> |-- mc0
> | |-- ce_count
> | |-- ce_noinfo_count
> | |-- csrow0
> | | |-- ce_count
> | | |-- ch0_ce_count
> | | |-- ch0_dimm_label
> | | |-- ch1_ce_count
> | | |-- ch1_dimm_label
> | | |-- dev_type
> | | |-- edac_mode
> | | |-- mem_type
> | | |-- size_mb
> | | `-- ue_count
> | |-- csrow1
> | | |-- ce_count
> | | |-- ch0_ce_count
> | | |-- ch0_dimm_label
> | | |-- ch1_ce_count
> | | |-- ch1_dimm_label
> | | |-- dev_type
> | | |-- edac_mode
> | | |-- mem_type
> | | |-- size_mb
> | | `-- ue_count
> | |-- csrow2
> | | |-- ce_count
> | | |-- ch0_ce_count
> | | |-- ch0_dimm_label
> | | |-- ch1_ce_count
> | | |-- ch1_dimm_label
> | | |-- dev_type
> | | |-- edac_mode
> | | |-- mem_type
> | | |-- size_mb
> | | `-- ue_count
> …
>
>
> > With somewhat matches what it is at the Bank Locator DMI information.
>
> I wouldn't say that - DMI is notoriously unreliable, let's look at some
> boxes:
>
> 1st box:
>
> Handle 0x0038, DMI type 17, 28 bytes
> Memory Device
> Array Handle: 0x0036
> Error Information Handle: Not Provided
> Total Width: 72 bits
> Data Width: 64 bits
> Size: 2048 MB
> Form Factor: DIMM
> Set: None
> Locator: DIMM0
>
> 2nd box:
>
> Memory Device
> Array Handle: 0x0014
> Error Information Handle: Not Provided
> Total Width: 64 bits
> Data Width: 4096 bits
> Size: 9 MB
> Form Factor: <OUT OF SPEC>
> Set: 73
> Locator: P0_DIMM_A1
> Bank Locator: CHANNEL A
>
> 3rd box:
>
> Handle 0x0033, DMI type 17, 28 bytes
> Memory Device
> Array Handle: 0x0031
> Error Information Handle: Not Provided
> Total Width: 64 bits
> Data Width: 64 bits
> Size: 4096 MB
> Form Factor: SODIMM
> Set: 2
> Locator: J401
> Bank Locator: Channel B
>
> and so on.
>
> IOW, DMI fields are almost random permutations of [a-zA-Z0-9].
>
> > So, it is easier to associate the dimm labels, of course assuming that
> > the DMI has the Bank Locator filled, and the BIOS doesn't have any bugs.
> >
> > Yet, even without it, several motherboards are provided with enough
> > info to map from channel/slot (or branch/channel/slot) into the DIMM
> > label. So, letting the EDAC core fill it, by default is a good thing.
> >
> > It should noticed that, as the label filling happens at the
> > edac_mc_alloc(), drivers can override it to better describe the memories
> > (and some actually do it).
>
> But I guess having the info is still fine, simply remove the DMI
> references in the commit message pls.
>
> > Cc: Aristeu Rozanski <arozansk@...hat.com>
> > Cc: Doug Thompson <norsk5@...oo.com>
> > Signed-off-by: Mauro Carvalho Chehab <mchehab@...hat.com>
> > ---
> > drivers/edac/edac_mc.c | 25 +++++++++++++++++++------
> > drivers/edac/edac_mc_sysfs.c | 8 ++++----
> > include/linux/edac.h | 2 +-
> > 3 files changed, 24 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
> > index 4c44cd298c0b..77263b33b7f0 100644
> > --- a/drivers/edac/edac_mc.c
> > +++ b/drivers/edac/edac_mc.c
> > @@ -210,10 +210,10 @@ struct mem_ctl_info *edac_mc_alloc(unsigned mc_num,
> > struct dimm_info *dimm;
> > u32 *ce_per_layer[EDAC_MAX_LAYERS], *ue_per_layer[EDAC_MAX_LAYERS];
> > unsigned pos[EDAC_MAX_LAYERS];
> > - void *pvt, *ptr = NULL;
> > unsigned size, tot_dimms = 1, count = 1;
> > unsigned tot_csrows = 1, tot_channels = 1, tot_errcount = 0;
> > - int i, j, err, row, chn;
> > + void *pvt, *p, *ptr = NULL;
> > + int i, j, err, row, chn, n, len;
> > bool per_rank = false;
> >
> > BUG_ON(n_layers > EDAC_MAX_LAYERS || n_layers == 0);
> > @@ -325,9 +325,22 @@ struct mem_ctl_info *edac_mc_alloc(unsigned mc_num,
> > i, per_rank ? "rank" : "dimm", (dimm - mci->dimms),
> > pos[0], pos[1], pos[2], row, chn);
> >
> > - /* Copy DIMM location */
> > - for (j = 0; j < n_layers; j++)
> > + /*
> > + * Copy DIMM location and initialize the memory location
>
> initialize it.
>
> or do you mean two different locations?
>
> > + */
> > + len = sizeof(dimm->label);
> > + p = dimm->label;
> > + n = snprintf(p, len, "mc#%u", mc_num);
> > + p += n;
> > + len -= n;
> > + for (j = 0; j < n_layers; j++) {
> > + n = snprintf(p, len, "%s#%u",
> > + edac_layer_name[layers[j].type],
> > + pos[j]);
> > + p += n;
> > + len -= n;
>
> Err, you're not checking how much len is left here, i.e.
> EDAC_MC_LABEL_LEN. Or even better, each time before you do snprintf.
>
> > dimm->location[j] = pos[j];
> > + }
> >
> > /* Link it to the csrows old API data */
> > chan->dimm = dimm;
> > @@ -837,7 +850,7 @@ static void edac_inc_ce_error(struct mem_ctl_info *mci,
> > {
> > int i, index = 0;
> >
> > - mci->ce_count++;
> > + mci->ce_mc++;
>
> Oh, renaming them back, ok.
>
> <rest snipped>
--
Regards/Gruss,
Boris.
Advanced Micro Devices GmbH
Einsteinring 24, 85609 Dornach
GM: Alberto Bozzo
Reg: Dornach, Landkreis Muenchen
HRB Nr. 43632 WEEE Registernr: 129 19551
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