linux-kernel - RE: [PATCH] cxl/pci: Change CXL AER support check to use native AER

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Date:   Thu, 2 Nov 2023 14:09:24 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Terry Bowman <terry.bowman@....com>, <alison.schofield@...el.com>,
        <vishal.l.verma@...el.com>, <ira.weiny@...el.com>,
        <bwidawsk@...nel.org>, <dan.j.williams@...el.com>,
        <dave.jiang@...el.com>, <Jonathan.Cameron@...wei.com>,
        <linux-cxl@...r.kernel.org>
CC:     <terry.bowman@....com>, <Smita.KoralahalliChannabasappa@....com>,
        <rrichter@....com>, <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] cxl/pci: Change CXL AER support check to use native AER

Terry Bowman wrote:
> Native CXL protocol errors are delivered to the OS through AER
> reporting. The owner of AER owns CXL Protocol error management with
> respect to _OSC negotiation.[1] CXL device errors are handled by a
> separate interrupt with native control gated by _OSC control field
> 'CXL Memory Error Reporting Control'.
> 
> The CXL driver incorrectly checks for 'CXL Memory Error Reporting
> Control' before accessing AER registers and caching RCH downport
> AER registers. Replace the current check in these 2 cases with
> native AER checks.
> 
> [1] CXL 3.0 - 9.17.2 CXL _OSC, Table-9-26, Interpretation of CXL
> _OSC Support Fields, p.641

Makes sense, applied.