linux-kernel - Re: [PATCH 05/14] cxl/mem: Register CXL memX devices

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Date:   Sat, 30 Jan 2021 15:52:01 -0800 (PST)
From:   David Rientjes <rientjes@...gle.com>
To:     Ben Widawsky <ben.widawsky@...el.com>
cc:     linux-cxl@...r.kernel.org, Dan Williams <dan.j.williams@...el.com>,
        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>,
        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>,
        daniel.lll@...baba-inc.com,
        "John Groves (jgroves)" <jgroves@...ron.com>,
        "Kelley, Sean V" <sean.v.kelley@...el.com>
Subject: Re: [PATCH 05/14] cxl/mem: Register CXL memX devices

On Fri, 29 Jan 2021, Ben Widawsky wrote:

> diff --git a/Documentation/ABI/testing/sysfs-bus-cxl b/Documentation/ABI/testing/sysfs-bus-cxl
> new file mode 100644
> index 000000000000..fe7b87eba988
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-bus-cxl
> @@ -0,0 +1,26 @@
> +What:		/sys/bus/cxl/devices/memX/firmware_version
> +Date:		December, 2020
> +KernelVersion:	v5.12
> +Contact:	linux-cxl@...r.kernel.org
> +Description:
> +		(RO) "FW Revision" string as reported by the Identify
> +		Memory Device Output Payload in the CXL-2.0
> +		specification.
> +
> +What:		/sys/bus/cxl/devices/memX/ram/size
> +Date:		December, 2020
> +KernelVersion:	v5.12
> +Contact:	linux-cxl@...r.kernel.org
> +Description:
> +		(RO) "Volatile Only Capacity" as reported by the
> +		Identify Memory Device Output Payload in the CXL-2.0
> +		specification.
> +
> +What:		/sys/bus/cxl/devices/memX/pmem/size
> +Date:		December, 2020
> +KernelVersion:	v5.12
> +Contact:	linux-cxl@...r.kernel.org
> +Description:
> +		(RO) "Persistent Only Capacity" as reported by the
> +		Identify Memory Device Output Payload in the CXL-2.0
> +		specification.

Aren't volatile and persistent capacities expressed in multiples of 256MB?