linux-kernel - Re: [RFC 1/5] cxl: Rename ACPI_CEDT_CFMWS_RESTRICT

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Message-ID: <Zvv8gtAy4hel9yY3@PC2K9PVX.TheFacebook.com>
Date: Tue, 1 Oct 2024 09:43:30 -0400
From: Gregory Price <gourry@...rry.net>
To: Huang Ying <ying.huang@...el.com>
Cc: Dan Williams <dan.j.williams@...el.com>,
	Dave Jiang <dave.jiang@...el.com>, linux-cxl@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Davidlohr Bueso <dave@...olabs.net>,
	Alison Schofield <alison.schofield@...el.com>,
	Vishal Verma <vishal.l.verma@...el.com>,
	Ira Weiny <ira.weiny@...el.com>,
	Alejandro Lucero <alucerop@....com>
Subject: Re: [RFC 1/5] cxl: Rename ACPI_CEDT_CFMWS_RESTRICT_TYPE2/TYPE3

On Wed, Sep 25, 2024 at 10:46:43AM +0800, 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@...el.com>
> Suggested-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Cc: Dan Williams <dan.j.williams@...el.com>
> Cc: Davidlohr Bueso <dave@...olabs.net>
> Cc: Jonathan Cameron <jonathan.cameron@...wei.com>
> Cc: Dave Jiang <dave.jiang@...el.com>
> Cc: Alison Schofield <alison.schofield@...el.com>
> Cc: Vishal Verma <vishal.l.verma@...el.com>
> Cc: Ira Weiny <ira.weiny@...el.com>
> Cc: Alejandro Lucero <alucerop@....com>
> ---
>  drivers/cxl/acpi.c           |  8 ++++----
>  drivers/cxl/core/port.c      |  8 ++++----
>  drivers/cxl/cxl.h            | 14 +++++++-------
>  include/acpi/actbl1.h        | 10 +++++-----
>  tools/testing/cxl/test/cxl.c | 18 +++++++++---------
>  5 files changed, 29 insertions(+), 29 deletions(-)
> 

Reviewed-by: Gregory Price <gourry@...rry.net>