Re: [RFC 1/5] cxl: Rename ACPI_CEDT_CFMWS_RESTRICT_TYPE2/TYPE3

[Davidlohr Bueso]

On Wed, 25 Sep 2024, Huang Ying wrote:

> According to the description of the "Window Restrictions" field of
> "CFMWS Structure" in the CXL spec v3.1 section 9.18.1.3: CXL Fixed
> Memory Window Structure (CFMWS), the bit 0 of "Window Restrictions" is
> formerly known as "CXL Type 2 Memory" and renamed to "Device
> Coherent", while the bit 1 is formerly known as "CXL Type 3 Memory"
> and renamed to "Host-only Coherent".  Because type 3 memory can only
> be host-only coherent before, while it can be host-only coherent or
> device coherent with "Back-Invalidate" now.
>
> To avoid confusing about type 3 memory and host-only coherent in Linux
> kernel, we rename corresponding bit definition from
> ACPI_CEDT_CFMWS_RESTRICT_TYPE2/TYPE3 to
> ACPI_CEDT_CFMWS_RESTRICT_DEVCOH/HOSTONLYCOH.  This makes the kernel
> code consistent with the spec too.
>
> Also rename the corresponding cxl_decoder flags
> CXL_DECODER_F_TYPE2/TYPE3 to CXL_DECODER_F_DEVCOH/HOSTONLYCOH.
>
> No functionality change is expected, because we just rename the flags
> constant definition.
>
> Signed-off-by: "Huang, Ying" <ying.huang@xxxxxxxxx>
> Suggested-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
> Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
> Cc: Davidlohr Bueso <dave@xxxxxxxxxxxx>
> Cc: Jonathan Cameron <jonathan.cameron@xxxxxxxxxx>
> Cc: Dave Jiang <dave.jiang@xxxxxxxxx>
> Cc: Alison Schofield <alison.schofield@xxxxxxxxx>
> Cc: Vishal Verma <vishal.l.verma@xxxxxxxxx>
> Cc: Ira Weiny <ira.weiny@xxxxxxxxx>
> Cc: Alejandro Lucero <alucerop@xxxxxxx>

Reviewed-by: Davidlohr Bueso <dave@xxxxxxxxxxxx>