linux-kernel - Re: [PATCH v9 08/13] cxl: Introduce callback for HPA address ranges translation

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Message-ID: <aWcLZM0qSBvK7V2v@aschofie-mobl2.lan>
Date: Tue, 13 Jan 2026 19:20:04 -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 08/13] cxl: Introduce callback for HPA address ranges
 translation

On Sat, Jan 10, 2026 at 12:46:53PM +0100, Robert Richter wrote:
> Introduce a callback to translate an endpoint's HPA range to the
> address range of the root port which is the System Physical Address
> (SPA) range used by a region. The callback can be set if a platform
> needs to handle address translation.
> 
> The callback is attached to the root port. An endpoint's root port can
> easily be determined in the PCI hierarchy without any CXL specific
> knowledge. This allows the early use of address translation for CXL
> enumeration. Address translation is esp. needed for the detection of
> the root decoders. Thus, the callback is embedded in struct
> cxl_root_ops instead of struct cxl_rd_ops.

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