Re: [PATCH v16 3/8] cxl/cdat: Gather DSMAS data for DCD partitions

[Jonathan Cameron <jic23@kernel.org>]

On Sun, 11 Oct 2026 07:54:54 +0900
Anisa Su <anisa.su887@gmail.com> wrote:

> From: Ira Weiny <iweiny@kernel.org>
> 
> Additional DCD partition (AKA region) information is contained in the
> DSMAS CDAT tables, including performance, shareable and read-only
> attributes.
> 
> Match DCD partitions with DSMAS tables and store the meta data. A DCD
> shall describe its DC partition in a DSMAS entry (CXL r4.0 9.13.3), so
> if the CDAT is absent, fails to parse, or has no entry matching the DC
> partition, disable DCD rather than run with unknown attributes.
> 
> DSLBIS is optional, but cxl_cdat_endpoint_process() treated zero DSLBIS
> entries as a parse failure, which would now disable DCD on a device with
> a valid DSMAS. Accept an empty DSLBIS, and skip DSMAS entries with no
> DSLBIS coordinates.
> 
> Signed-off-by: Ira Weiny <iweiny@kernel.org>
> Co-developed-by: Anisa Su <anisa.su@samsung.com>
> Signed-off-by: Anisa Su <anisa.su@samsung.com>
> Tested-by: Wonjae Lee <wj28.lee@samsung.com>
> Tested-by: Junhee Park <jh9934.park@samsung.com>
> Tested-by: Heesoo Kim <habil.kim@samsung.com>
> Reviewed-by: Alison Schofield <alison.schofield@intel.com>
> 
Reviewed-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>