linux-kernel - Re: [RFC PATCH 5/9] cxl/mem: Find device capabilities

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Message-ID: <8d332852-9c54-95e0-58c7-72939f347aa6@jonmasters.org>
Date:   Thu, 26 Nov 2020 01:05:56 -0500
From:   Jon Masters <jcm@...masters.org>
To:     Ben Widawsky <ben.widawsky@...el.com>, linux-cxl@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-acpi@...r.kernel.org,
        Dan Williams <dan.j.williams@...el.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        "Kelley, Sean V" <sean.v.kelley@...el.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: [RFC PATCH 5/9] cxl/mem: Find device capabilities

On 11/11/20 12:43 AM, Ben Widawsky wrote:

> +		case CXL_CAPABILITIES_CAP_ID_SECONDARY_MAILBOX:
> +			dev_dbg(&cxlm->pdev->dev,
> +				   "found UNSUPPORTED Secondary Mailbox capability\n");

Per spec, the secondary mailbox is intended for use by platform 
firmware, so Linux should never be using it anyway. Maybe that message 
is slightly misleading?

Jon.

P.S. Related - I've severe doubts about the mailbox approach being 
proposed by CXL and have begun to push back through the spec org.

-- 
Computer Architect