linux-kernel - Re: [PATCH 0/2] efi/cper, cxl: Decode CXL Protocol Errors CPER

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Message-ID: <63587b16dbb3_14192944c@dwillia2-mobl3.amr.corp.intel.com.notmuch>
Date:   Tue, 25 Oct 2022 17:11:02 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>,
        Dan Williams <dan.j.williams@...el.com>,
        <linux-cxl@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     Alison Schofield <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Ben Widawsky <bwidawsk@...nel.org>,
        Robert Richter <rrichter@....com>,
        Yazen Ghannam <yazen.ghannam@....com>,
        Terry Bowman <terry.bowman@....com>,
        Ard Biesheuvel <ardb@...nel.org>
Subject: Re: [PATCH 0/2] efi/cper, cxl: Decode CXL Protocol Errors CPER

Smita Koralahalli wrote:
> Hi Dan,
> 
> On 10/21/2022 3:18 PM, Dan Williams wrote:
> > Hi Smita,
> >
> > Smita Koralahalli wrote:
> >> This series adds decoding for the CXL Protocol Errors Common Platform
> >> Error Record.
> > Be sure to copy Ard Biesheuvel <ardb@...nel.org>, added, on
> > drivers/firmware/efi/ patches.
> >
> > Along those lines, drivers/cxl/ developers have an idea of what is
> > contained in the new CXL protocol error records and why Linux might want
> > to decode them, others from outside drivers/cxl/ might not. It always
> > helps to have a small summary of the benefit to end users of the
> > motivation to apply a patch set.
> 
> Sure, will include in my v2.
> 
> >
> >> Smita Koralahalli (2):
> >>    efi/cper, cxl: Decode CXL Protocol Error Section
> >>    efi/cper, cxl: Decode CXL Error Log
> >>
> >>   drivers/firmware/efi/Makefile   |   2 +-
> >>   drivers/firmware/efi/cper.c     |   9 +++
> >>   drivers/firmware/efi/cper_cxl.c | 108 ++++++++++++++++++++++++++++++++
> >>   drivers/firmware/efi/cper_cxl.h |  58 +++++++++++++++++
> >>   include/linux/cxl_err.h         |  21 +++++++
> >>   5 files changed, 197 insertions(+), 1 deletion(-)
> > I notice no updates for the trace events in ghes_do_proc(), is that next
> > in your queue? That's ok to be a follow-on after v2.
> 
> Sorry, if I haven't understood this right. Are you implying about the 
> "handling"
> of cxl memory errors in ghes_do_proc() or is it just copying of CPER 
> entries to
> tracepoints?

Right now ghes_do_proc() will let the CXL CPER records fall through to
log_non_standard_event(). Are you planning to add trace event decode
there for CPER_SEC_CXL_PROT_ERR records?

I am not sure if the CXL CPER to trace record conversion belongs there,
or somewhere closer to trace_aer_event() invocations since the CXL
protocol errors are effectively an extenstion of PCI AER events.