linux-kernel - Re: [PATCH v5 1/9] cxl/mem: Introduce a driver for CXL-2.0-Type-3 endpoints

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Date:   Fri, 19 Feb 2021 19:54:44 -0500
From:   Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:     Ben Widawsky <ben.widawsky@...el.com>
Cc:     linux-cxl@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-nvdimm@...ts.01.org,
        linux-pci@...r.kernel.org, Bjorn Helgaas <helgaas@...nel.org>,
        Chris Browy <cbrowy@...ry-design.com>,
        Christoph Hellwig <hch@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        David Hildenbrand <david@...hat.com>,
        David Rientjes <rientjes@...gle.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Jon Masters <jcm@...masters.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Rafael Wysocki <rafael.j.wysocki@...el.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Vishal Verma <vishal.l.verma@...el.com>,
        "John Groves (jgroves)" <jgroves@...ron.com>,
        "Kelley, Sean V" <sean.v.kelley@...el.com>,
        Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH v5 1/9] cxl/mem: Introduce a driver for CXL-2.0-Type-3
 endpoints

On Tue, Feb 16, 2021 at 08:09:50PM -0800, Ben Widawsky wrote:
> From: Dan Williams <dan.j.williams@...el.com>
> 
> The CXL.mem protocol allows a device to act as a provider of "System
> RAM" and/or "Persistent Memory" that is fully coherent as if the memory
> was attached to the typical CPU memory controller.
> 
> With the CXL-2.0 specification a PCI endpoint can implement a "Type-3"
> device interface and give the operating system control over "Host
> Managed Device Memory". See section 2.3 Type 3 CXL Device.
> 
> The memory range exported by the device may optionally be described by
> the platform firmware memory map, or by infrastructure like LIBNVDIMM to
> provision persistent memory capacity from one, or more, CXL.mem devices.
> 
> A pre-requisite for Linux-managed memory-capacity provisioning is this
> cxl_mem driver that can speak the mailbox protocol defined in section
> 8.2.8.4 Mailbox Registers.
> 
> For now just land the initial driver boiler-plate and Documentation/
> infrastructure.
> 
> Link: https://www.computeexpresslink.org/download-the-specification
> Cc: Jonathan Corbet <corbet@....net>
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> Signed-off-by: Ben Widawsky <ben.widawsky@...el.com>
> Acked-by: David Rientjes <rientjes@...gle.com> (v1)
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>

Albeit you may want to modify 2020 to 2021 in the Copyright sections.