RE: [PATCH V13 8/9] cxl/port: Retry reading CDAT on failure

From: Dan Williams
Date: Thu Jul 14 2022 - 12:30:24 EST

ira.weiny@ wrote:
> From: Ira Weiny <ira.weiny@xxxxxxxxx>
> The CDAT read may fail for a number of reasons but mainly it is possible
> to get different parts of a valid state. The checksum in the CDAT table
> protects against this.

I don't know what "different parts of a valid state" means. The CDAT
should not be changing as it is being read unless someone is issuing a
set-partition while the DOE operation is happening. Rather than
arbitrary retries, block out set-partition while CDAT is being read.

You can use {set,clear}_exclusive_cxl_commands() to temporarily lock out
set-partition while the CDAT read is happening.

...and since this series is only for enabling