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@xxxxxxxxxxxxxxx > > > +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@xxxxxxxxxxxxxxx > > > +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@xxxxxxxxxxxxxxx > > > +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?
