Re: [PATCH] edac: i5100 ack error detection register after each read

From: Borislav Petkov
Date: Fri Dec 09 2011 - 11:23:08 EST


Adding Tony.

On Fri, Dec 09, 2011 at 05:12:15PM +0100, Niklas Söderlund wrote:
> If I only ack the detection register after a error have been detected
> I'm unable to reliably detect errors. I have verified this behavior
> using both an error injection DIMM and software to inject errors.
>
> I can't find any documentation supporting this behavior in Intel 5100
> Memory Controller Hub Chipset, see 1. So this is all based on
> experimentation.
>
> [1] Intel® 5100 Memory Controller Hub Chipset
> http://www.intel.com/content/dam/doc/datasheet/5100-
> memory-controller-hub-chipset-datasheet.pdf
>
> Signed-off-by: Niklas Söderlund <niklas.soderlund@xxxxxxxxxxxx>
> ---
> drivers/edac/i5100_edac.c | 11 ++++-------
> 1 files changed, 4 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/edac/i5100_edac.c b/drivers/edac/i5100_edac.c
> index bcbdeec..ec728e9 100644
> --- a/drivers/edac/i5100_edac.c
> +++ b/drivers/edac/i5100_edac.c
> @@ -535,23 +535,20 @@ static void i5100_read_log(struct mem_ctl_info *mci, int chan,
> static void i5100_check_error(struct mem_ctl_info *mci)
> {
> struct i5100_priv *priv = mci->pvt_info;
> - u32 dw;
> -
> + u32 dw, dw2;
>
> pci_read_config_dword(priv->mc, I5100_FERR_NF_MEM, &dw);
> if (i5100_ferr_nf_mem_any(dw)) {
> - u32 dw2;
>
> pci_read_config_dword(priv->mc, I5100_NERR_NF_MEM, &dw2);
> - if (dw2)
> - pci_write_config_dword(priv->mc, I5100_NERR_NF_MEM,
> - dw2);
> - pci_write_config_dword(priv->mc, I5100_FERR_NF_MEM, dw);
>
> i5100_read_log(mci, i5100_ferr_nf_mem_chan_indx(dw),
> i5100_ferr_nf_mem_any(dw),
> i5100_nerr_nf_mem_any(dw2));
> +
> + pci_write_config_dword(priv->mc, I5100_NERR_NF_MEM, dw2);
> }
> + pci_write_config_dword(priv->mc, I5100_FERR_NF_MEM, dw);
> }
>
> /* The i5100 chipset will scrub the entire memory once, then
> --
> 1.7.7.3
>
>

--
Regards/Gruss,
Boris.

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