linux-kernel - Re: [PATCH v3 6/7] firmware/efi: Process CXL Component Events

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Date:   Thu, 14 Dec 2023 10:24:26 -0800
From:   Ira Weiny <ira.weiny@...el.com>
To:     Ira Weiny <ira.weiny@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Jonathan Cameron <jonathan.cameron@...wei.com>,
        Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>,
        Shiju Jose <shiju.jose@...wei.com>
CC:     Yazen Ghannam <yazen.ghannam@....com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Dave Jiang <dave.jiang@...el.com>,
        Alison Schofield <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        "Ard Biesheuvel" <ardb@...nel.org>, <linux-efi@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-cxl@...r.kernel.org>,
        Ira Weiny <ira.weiny@...el.com>
Subject: Re: [PATCH v3 6/7] firmware/efi: Process CXL Component Events

Ira Weiny wrote:
> BIOS can configure memory devices as firmware first.  This will send CXL
> events to the firmware instead of the OS.  The firmware can then send
> these events to the OS via UEFI.
> 
> UEFI v2.10 section N.2.14 defines a Common Platform Error Record (CPER)
> format for CXL Component Events.  The format is mostly the same as the
> CXL Common Event Record Format.  The difference is the use of a GUID in
> the Section Type rather than a UUID as part of the event itself.
> 
> Add EFI support to detect CXL CPER records and call a registered
> notifier with the event.  Enforce that only one notifier call can be
> registered at any time.
> 
> Cc: Ard Biesheuvel <ardb@...nel.org>
> Signed-off-by: Ira Weiny <ira.weiny@...el.com>

V4 coming with 0day build fixes for the CONFIG_UEFI_CPER=n case.

Ira