linux-kernel - Re: [PATCH v3 04/11] cxl/region: Add @range argument to function cxl_find_root

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Message-ID: <aMsUeUME_6wkhfp1@gourry-fedora-PF4VCD3F>
Date: Wed, 17 Sep 2025 16:05:13 -0400
From: Gregory Price <gourry@...rry.net>
To: Robert Richter <rrichter@....com>
Cc: 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>,
	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,
	"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 v3 04/11] cxl/region: Add @range argument to function
 cxl_find_root_decoder()

On Fri, Sep 12, 2025 at 04:45:06PM +0200, Robert Richter wrote:
> cxl_find_root_decoder() uses the endpoint decoder's HPA range to find
> the root decoder. This requires endpoints and root decoders to be in
> the same memory domain, which is not the case for systems that need
> address translation.
> 
> Add a separate @range argument to function cxl_find_root_decoder() to
> specify the root decoder's address range. Now it is possible to pass a
> translated address range of an endpoint decoder to function
> cxl_find_root_decoder().
> 
> Patch is a prerequisite to implement address translation.
>
> Signed-off-by: Robert Richter <rrichter@....com>

Maybe worth noting that this patch is just a refactor (i.e. no-op).

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