linux-kernel - Re: [PATCH v5 5/5] acpi/ghes, cxl/pci: Process CXL CPER Protocol Errors

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Message-ID: <67891de359b4b_1be18a29461@iweiny-mobl.notmuch>
Date: Thu, 16 Jan 2025 08:55:31 -0600
From: Ira Weiny <ira.weiny@...el.com>
To: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>,
	<linux-efi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-cxl@...r.kernel.org>
CC: Ard Biesheuvel <ardb@...nel.org>, Alison Schofield
	<alison.schofield@...el.com>, 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>, Terry Bowman <terry.bowman@....com>, "Smita
 Koralahalli" <Smita.KoralahalliChannabasappa@....com>
Subject: Re: [PATCH v5 5/5] acpi/ghes, cxl/pci: Process CXL CPER Protocol
 Errors

Smita Koralahalli wrote:
> When PCIe AER is in FW-First, OS should process CXL Protocol errors from
> CPER records. Introduce support for handling and logging CXL Protocol
> errors.
> 
> The defined trace events cxl_aer_uncorrectable_error and
> cxl_aer_correctable_error trace native CXL AER endpoint errors, while
> cxl_cper_trace_corr_prot_err and cxl_cper_trace_uncorr_prot_err
> trace native CXL AER port errors. Reuse both sets to trace FW-First
> protocol errors.
> 
> Since the CXL code is required to be called from process context and
> GHES is in interrupt context, use workqueues for processing.
> 
> Similar to CXL CPER event handling, use kfifo to handle errors as it
> simplifies queue processing by providing lock free fifo operations.
> 
> Add the ability for the CXL sub-system to register a workqueue to
> process CXL CPER protocol errors.
> 
> Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>

Reviewed-by: Ira Weiny <ira.weiny@...el.com>

[snip]