linux-kernel - Re: [PATCH V14 4/7] cxl/pci: Create PCI DOE mailbox's for memory devices

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Message-ID: <20220719173820.00004e6e@Huawei.com>
Date:   Tue, 19 Jul 2022 17:38:20 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     <ira.weiny@...el.com>
CC:     Dan Williams <dan.j.williams@...el.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Lukas Wunner <lukas@...ner.de>,
        Alison Schofield <alison.schofield@...el.com>,
        "Vishal Verma" <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        "Ben Widawsky" <bwidawsk@...nel.org>,
        <linux-kernel@...r.kernel.org>, <linux-cxl@...r.kernel.org>,
        <linux-pci@...r.kernel.org>
Subject: Re: [PATCH V14 4/7] cxl/pci: Create PCI DOE mailbox's for memory
 devices

On Thu, 14 Jul 2022 20:04:21 -0700
ira.weiny@...el.com wrote:

> From: Ira Weiny <ira.weiny@...el.com>
> 
> DOE mailbox objects will be needed for various mailbox communications
> with each memory device.
> 
> Iterate each DOE mailbox capability and create PCI DOE mailbox objects
> as found.
> 
> It is not anticipated that this is the final resting place for the
> iteration of the DOE devices.  The support of switch ports will drive
> this code into the PCIe side.  In this imagined architecture the CXL
> port driver would then query into the PCI device for the DOE mailbox
> array.
> 
> For now creating the mailboxes in the CXL port is good enough for the
> endpoints.  Later PCIe ports will need to support this to support switch
> ports more generically.
> 
> Cc: Dan Williams <dan.j.williams@...el.com>
> Cc: Davidlohr Bueso <dave@...olabs.net>
> Cc: Lukas Wunner <lukas@...ner.de>
> Signed-off-by: Ira Weiny <ira.weiny@...el.com>
LGTM

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>