linux-kernel - Re: [PATCH 3/4] acpi/ghes, cxl/pci: Trace FW-First CXL Protocol Errors

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Date: Wed, 22 May 2024 17:22:48 -0700
From: Alison Schofield <alison.schofield@...el.com>
To: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
Cc: linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-cxl@...r.kernel.org, Ard Biesheuvel <ardb@...nel.org>,
	Vishal Verma <vishal.l.verma@...el.com>,
	Ira Weiny <ira.weiny@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Yazen Ghannam <yazen.ghannam@....com>,
	Bowman Terry <terry.bowman@....com>
Subject: Re: [PATCH 3/4] acpi/ghes, cxl/pci: Trace FW-First CXL Protocol
 Errors

On Wed, May 22, 2024 at 03:08:38PM +0000, Smita Koralahalli wrote:
> When PCIe AER is in FW-First, OS should process CXL Protocol errors from
> CPER records.
> 
> Reuse the existing work queue cxl_cper_work registered with GHES to notify
> the CXL subsystem on a Protocol error.
> 
> The defined trace events cxl_aer_uncorrectable_error and
> cxl_aer_correctable_error currently trace native CXL AER errors. Reuse
> them to trace FW-First Protocol Errors.

Will the trace log differentiate between errors reported in FW-First
versus Native mode?  Wondering if that bit of info needs to be logged
or is discoverable elsewhere.

Otherwise, LGTM,
Reviewed-by: Alison Schofield <alison.schofield@...el.com>


> 
> Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
> ---
>  drivers/acpi/apei/ghes.c  | 14 ++++++++++++++
>  drivers/cxl/core/pci.c    | 24 ++++++++++++++++++++++++
>  drivers/cxl/cxlpci.h      |  3 +++
>  drivers/cxl/pci.c         | 34 ++++++++++++++++++++++++++++++++--
>  include/linux/cxl-event.h |  1 +
>  5 files changed, 74 insertions(+), 2 deletions(-)

snip