Re: [PATCH 2/5] cxl: Rename CXL_DECODER_HOSTONLYMEM/DEVMEM

[Dan Williams]

Huang Ying wrote:
> Previously, CXL type3 devices (memory expanders) use host only
> coherence (HDM-H), while CXL type2 devices (accelerators) use dev
> coherence (HDM-D).  So the name of the target device type of a cxl
> decoder is CXL_DECODER_HOSTONLYMEM for type3 devices and
> CXL_DECODER_DEVMEM for type2 devices.  However, this isn't true
> anymore.  CXL type3 devices can use dev coherence + back
> invalidation (HDM-DB) too.
> 
> To avoid confusion between the device type and coherence, the patch
> renames CXL_DECODER_HOSTONLYMEM/DEVMEM to CXL_DECODER_EXPANDER/ACCEL.

This does not look like an improvement to me. Type-3 devices that
support back-invalidate are DEVMEM devices. The device plays a role in
the coherence. 

Your explanation is the reverse of this commit:

5aa39a9165cf cxl/port: Rename CXL_DECODER_{EXPANDER, ACCELERATOR} => {HOSTONLYMEM, DEVMEM}

...so I am confused what motivated this rename?