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    SubjectRe: [PATCH 05/14] cxl/mem: Register CXL memX devices
    On Mon, 1 Feb 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@vger.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@vger.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@vger.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?
    >
    > As of the spec today, volatile and persistent capacities are required to be
    > in multiples of 256MB, however, future specs may not have such a requirement and
    > I think keeping sysfs ABI easily forward portable makes sense.
    >

    Makes sense, can we add that these are expressed in bytes or is that
    already implied?

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