linux-kernel - Re: [RFC PATCH v3 04/16] cxl/mem: Introduce a driver for CXL-2.0-Type-3 endpoints

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Date:   Mon, 11 Jan 2021 23:08:43 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Ben Widawsky <ben.widawsky@...el.com>, linux-cxl@...r.kernel.org
Cc:     Dan Williams <dan.j.williams@...el.com>,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-acpi@...r.kernel.org, Ira Weiny <ira.weiny@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        "Kelley, Sean V" <sean.v.kelley@...el.com>,
        Rafael Wysocki <rafael.j.wysocki@...el.com>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Jon Masters <jcm@...masters.org>,
        Chris Browy <cbrowy@...ry-design.com>,
        Christoph Hellwig <hch@...radead.org>,
        daniel.lll@...baba-inc.com
Subject: Re: [RFC PATCH v3 04/16] cxl/mem: Introduce a driver for
 CXL-2.0-Type-3 endpoints

On 1/11/21 2:51 PM, Ben Widawsky wrote:
> diff --git a/drivers/cxl/Kconfig b/drivers/cxl/Kconfig
> index 68da926ba5b1..0ac5080cd6e0 100644
> --- a/drivers/cxl/Kconfig
> +++ b/drivers/cxl/Kconfig
> @@ -33,4 +33,26 @@ config CXL_ACPI
>  	  specification.
>  
>  	  If unsure say 'm'
> +
> +config CXL_MEM
> +        tristate "CXL.mem: Endpoint Support"
> +        depends on PCI && CXL_BUS_PROVIDER
> +        default CXL_BUS_PROVIDER
> +        help
> +          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.

All of those indented lines should use one tab (tristate, depends, default,
and help). The help text should be indented with one tab + 2 spaces,
like the lines below are.

> +
> +	  Say 'y/m' to enable a driver (named "cxl_mem.ko" when built as
> +	  a module) that will attach to CXL.mem devices for
> +	  configuration, provisioning, and health monitoring. This
> +	  driver is required for dynamic provisioning of CXL.mem
> +	  attached memory which is a pre-requisite for persistent memory

patch 2 spells this as:              prerequisite
which is preferred IMO.

> +	  support. Typically volatile memory is mapped by platform
> +	  firmware and included in the platform memory map, but in some
> +	  cases the OS is responsible for mapping that memory. See
> +	  Chapter 2.3 Type 3 CXL Device in the CXL 2.0 specification.
> +
> +          If unsure say 'm'.

That last line needs one tab + 2 spaces for indentation.

>  endif


-- 
~Randy