linux-kernel - Re: [PATCH] cxl: Rename ACPI_CEDT_CFMWS_RESTRICT

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Message-ID: <672a37005ec2a_14ccd729427@iweiny-mobl.notmuch>
Date: Tue, 5 Nov 2024 09:17:20 -0600
From: Ira Weiny <ira.weiny@...el.com>
To: Huang Ying <ying.huang@...el.com>, Dan Williams
	<dan.j.williams@...el.com>, Dave Jiang <dave.jiang@...el.com>
CC: <linux-cxl@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Huang Ying
	<ying.huang@...el.com>, Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Davidlohr Bueso <dave@...olabs.net>, Gregory Price <gourry@...rry.net>,
	Alison Schofield <alison.schofield@...el.com>, Vishal Verma
	<vishal.l.verma@...el.com>, Ira Weiny <ira.weiny@...el.com>, Alejandro Lucero
	<alucerop@....com>, Ben Cheatham <benjamin.cheatham@....com>
Subject: Re: [PATCH] cxl: Rename ACPI_CEDT_CFMWS_RESTRICT_TYPE2/TYPE3

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 confusion about type 2/3 memory and device/host-only coherent
> in Linux kernel, the patch renames corresponding bit definition from
> ACPI_CEDT_CFMWS_RESTRICT_TYPE2/TYPE3 to
> ACPI_CEDT_CFMWS_RESTRICT_DEVMEM/HOSTONLYMEM.  This makes the kernel
> code consistent with the spec too.
> 
> The patch also renames the corresponding cxl_decoder flags
> CXL_DECODER_F_TYPE2/TYPE3 to CXL_DECODER_F_DEVMEM/HOSTONLYMEM.
> 
> No functionality change is expected.
> 
> Signed-off-by: "Huang, Ying" <ying.huang@...el.com>
> Suggested-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Reviewed-by: Davidlohr Bueso <dave@...olabs.net>
> Reviewed-by: Gregory Price <gourry@...rry.net>
> Cc: Dan Williams <dan.j.williams@...el.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>

Reviewed-by: Ira Weiny <ira.weiny@...el.com>