linux-kernel - Re: [PATCH v9 07/13] cxl/region: Use region data to get the root decoder

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Message-ID: <aWcLKytCUXoNwcy-@aschofie-mobl2.lan>
Date: Tue, 13 Jan 2026 19:19:07 -0800
From: Alison Schofield <alison.schofield@...el.com>
To: Robert Richter <rrichter@....com>
CC: Vishal Verma <vishal.l.verma@...el.com>, Ira Weiny <ira.weiny@...el.com>,
	Dan Williams <dan.j.williams@...el.com>, Jonathan Cameron
	<jonathan.cameron@...wei.com>, Dave Jiang <dave.jiang@...el.com>, "Davidlohr
 Bueso" <dave@...olabs.net>, <linux-cxl@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Gregory Price <gourry@...rry.net>, "Fabio M.
 De Francesco" <fabio.m.de.francesco@...ux.intel.com>, Terry Bowman
	<terry.bowman@....com>, Joshua Hahn <joshua.hahnjy@...il.com>
Subject: Re: [PATCH v9 07/13] cxl/region: Use region data to get the root
 decoder

On Sat, Jan 10, 2026 at 12:46:52PM +0100, Robert Richter wrote:
> To find a region's root decoder, the endpoint's HPA range is used to
> search the matching decoder by its range. With address translation the
> endpoint decoder's range is in a different address space and thus
> cannot be used to determine the root decoder.
> 
> The region parameters are encapsulated within struc cxl_region_context

maybe s/struc/struct upon applying 

> and may include the translated Host Physical Address (HPA) range. Use
> this context to identify the root decoder rather than relying on the
> endpoint.
> 
> Modify cxl_find_root_decoder() and add the region context as
> parameter. Rename this function to get_cxl_root_decoder() as a
> counterpart to put_cxl_root_decoder(). Simplify the implementation by
> removing function cxl_port_find_switch_decode(). The function is
> unnecessary because it is not referenced or utilized elsewhere in the
> code.
> 

Reviewed-by: Alison Schofield <alison.schofield@...el.com>