Re: [PATCH] sb_edac: avoid INTERNAL ERROR message in EDAC with unspecified channel

[Seth Jennings]

On Mon, Sep 08, 2014 at 10:18:51AM -0400, Aristeu Rozanski wrote:
> On Fri, Sep 05, 2014 at 02:28:47PM -0500, Seth Jennings wrote:
> > Intel IA32 SDM Table 15-14 defines channel 0xf as 'not specified', but
> > EDAC doesn't know about this and returns and INTERNAL ERROR when the
> > channel is greater than NUM_CHANNELS:
> > 
> > kernel: [ 1538.886456] CPU 0: Machine Check Exception: 0 Bank 1: 940000000000009f
> > kernel: [ 1538.886669] TSC 2bc68b22e7e812 ADDR 46dae7000 MISC 0 PROCESSOR 0:306e4 TIME 1390414572 SOCKET 0 APIC 0
> > kernel: [ 1538.971948] EDAC MC1: INTERNAL ERROR: channel value is out of range (15 >= 4)
> > kernel: [ 1538.972203] EDAC MC1: 0 CE memory read error on unknown memory (slot:0 page:0x46dae7 offset:0x0 grain:0 syndrome:0x0 -  area:DRAM err_code:0000:009f socket:1 channel_mask:1 rank:0)
> > 
> > This commit changes sb_edac to forward a channel of -1 to EDAC if the
> > channel is not specified.  edac_mc_handle_error() sets the channel to -1
> > internally after the error message anyway, so this commit should have no
> > effect other than avoiding the INTERNAL ERROR message when the channel
> > is not specified.

Hey Mauro,

I was wanting to make sure this was on your radar.  I don't see it in
-next and haven't gotten any feedback or confirmation that the patch has
been accepted/rejected/needs work.

Seth

> > 
> > Signed-off-by: Seth Jennings <sjenning@xxxxxxxxxx>
> > Cc: Aristeu Rozanski <aris@xxxxxxxxxx>
> > Cc: linux-edac@xxxxxxxxxxxxxxx
> > Cc: linux-kernel@xxxxxxxxxxxxxxx
> > ---
> >  drivers/edac/sb_edac.c | 8 ++++++--
> >  1 file changed, 6 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/edac/sb_edac.c b/drivers/edac/sb_edac.c
> > index 0034c48..07efed4 100644
> > --- a/drivers/edac/sb_edac.c
> > +++ b/drivers/edac/sb_edac.c
> > @@ -283,8 +283,9 @@ static const u32 correrrthrsld[] = {
> >   * sbridge structs
> >   */
> >  
> > -#define NUM_CHANNELS	4
> > -#define MAX_DIMMS	3		/* Max DIMMS per channel */
> > +#define NUM_CHANNELS		4
> > +#define MAX_DIMMS		3	/* Max DIMMS per channel */
> > +#define CHANNEL_UNSPECIFIED	0xf	/* Intel IA32 SDM 15-14 */
> >  
> >  enum type {
> >  	SANDY_BRIDGE,
> > @@ -1991,6 +1992,9 @@ static void sbridge_mce_output_error(struct mem_ctl_info *mci,
> >  
> >  	/* FIXME: need support for channel mask */
> >  
> > +	if (channel == CHANNEL_UNSPECIFIED)
> > +		channel = -1;
> > +
> >  	/* Call the helper to output message */
> >  	edac_mc_handle_error(tp_event, mci, core_err_cnt,
> >  			     m->addr >> PAGE_SHIFT, m->addr & ~PAGE_MASK, 0,
> 
> Acked-by: Aristeu Rozanski <aris@xxxxxxxxxx>
> 
> -- 
> Aristeu
> 
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