linux-kernel - Re: [PATCH v6 5/6] acpi/ghes, cxl/pci: Process CXL CPER Protocol Errors

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Message-ID: <Z6PA_hN-3ZtWbhUh@gourry-fedora-PF4VCD3F>
Date: Wed, 5 Feb 2025 14:50:22 -0500
From: Gregory Price <gourry@...rry.net>
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>,
	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>
Subject: Re: [PATCH v6 5/6] acpi/ghes, cxl/pci: Process CXL CPER Protocol
 Errors

On Thu, Jan 23, 2025 at 08:44:20AM +0000, 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. Reuse them
> 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: Dave Jiang <dave.jiang@...el.com>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Reviewed-by: Ira Weiny <ira.weiny@...el.com>

Reviewed-by: Gregory Price <gourry@...rry.net>