(Linux term for the top of the CXL decode topology). From there, PCIe topology
dictates which endpoints can participate in which Host Bridge decode regimes.
Each PCIe Switch in the path between the root and an endpoint introduces a point
-at which the interleave can be split. For example platform firmware may say at a
-given range only decodes to 1 one Host Bridge, but that Host Bridge may in turn
+at which the interleave can be split. For example, platform firmware may say a
+given range only decodes to one Host Bridge, but that Host Bridge may in turn
interleave cycles across multiple Root Ports. An intervening Switch between a
port and an endpoint may interleave cycles across multiple Downstream Switch
Ports, etc.
represent the decode from SPA (System Physical Address) to DPA (Device Physical
Address).
-Continuing the RAID analogy, disks have both topology metadata and on device
+Continuing the RAID analogy, disks have both topology metadata and on-device
metadata that determine RAID set assembly. CXL Port topology and CXL Port link
status is metadata for CXL.mem set assembly. The CXL Port topology is enumerated
by the arrival of a CXL.mem device. I.e. unless and until the PCIe core attaches
->remove() event cleans up the port data that was established to support that
Memory Expander.
-The port metadata and potential decode schemes that a give memory device may
+The port metadata and potential decode schemes that a given memory device may
participate can be determined via a command like::
# cxl list -BDMu -d root -m mem3
...which queries the CXL topology to ask "given CXL Memory Expander with a kernel
device name of 'mem3' which platform level decode ranges may this device
participate". A given expander can participate in multiple CXL.mem interleave
-sets simultaneously depending on how many decoder resource it has. In this
-example mem3 can participate in one or more of a PMEM interleave that spans to
+sets simultaneously depending on how many decoder resources it has. In this
+example mem3 can participate in one or more of a PMEM interleave that spans two
Host Bridges, a PMEM interleave that targets a single Host Bridge, a Volatile
memory interleave that spans 2 Host Bridges, and a Volatile memory interleave
that only targets a single Host Bridge.