linux-kernel - Re: [PATCH] cxl: Remove core/acpi.c and cxl core dependency on ACPI

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Message-ID: <20250711173638.00003270@huawei.com>
Date: Fri, 11 Jul 2025 17:36:38 +0100
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: Robert Richter <rrichter@....com>
CC: Davidlohr Bueso <dave@...olabs.net>, Dave Jiang <dave.jiang@...el.com>,
	Alison Schofield <alison.schofield@...el.com>, Vishal Verma
	<vishal.l.verma@...el.com>, Ira Weiny <ira.weiny@...el.com>, Dan Williams
	<dan.j.williams@...el.com>, <linux-kernel@...r.kernel.org>,
	<linux-cxl@...r.kernel.org>
Subject: Re: [PATCH] cxl: Remove core/acpi.c and cxl core dependency on ACPI

On Fri, 11 Jul 2025 17:15:27 +0200
Robert Richter <rrichter@....com> wrote:

> From Dave [1]:
> 
> """
> It was a mistake to introduce core/acpi.c and putting ACPI dependency on
> cxl_core when adding the extended linear cache support.
> """
> 
> Current implementation calls hmat_get_extended_linear_cache_size() of
> the ACPI subsystem. That external reference causes issue running
> cxl_test as there is no way to "mock" that function and ignore it when
> using cxl test.
> 
> Instead of working around that using cxlrd ops and extensively
> expanding cxl_test code [1], just move HMAT calls out of the core
> module to cxl_acpi. Implement this by adding a @cache_size member to
> struct cxl_root_decoder. During initialization the cache size is
> determined and added to the root decoder object in cxl_acpi. Later on
> in cxl_core the cache_size parameter is used to setup extended linear
> caching.
> 
> [1] https://patch.msgid.link/20250610172938.139428-1-dave.jiang@intel.com
> 
> Cc: Dave Jiang <dave.jiang@...el.com>
> Signed-off-by: Robert Richter <rrichter@....com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@...wei.com>