linux-kernel - Re: [PATCH v3 08/11] cxl/region: Implement endpoint decoder address translation

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Message-ID: <aMwQSYUXHtZidrpY@gourry-fedora-PF4VCD3F>
Date: Thu, 18 Sep 2025 09:59:37 -0400
From: Gregory Price <gourry@...rry.net>
To: Jonathan Cameron <jonathan.cameron@...wei.com>
Cc: Robert Richter <rrichter@....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>,
	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 08/11] cxl/region: Implement endpoint decoder address
 translation

On Wed, Sep 17, 2025 at 04:51:37PM -0400, Gregory Price wrote:
> You have to do the alignment because the translation function (may)
> only work on granularity alignment.
> 
> Example:
> endpoint1->to_hpa(0)         => 0x0
> endpoint1->to_hpa(0xfffffff) => 0xffffe00
                                  0x3ffffe00
> endpoint2->to_hpa(0)         => 0x100
> endpoint2->to_hpa(0xfffffff) => 0xfffff00
                                  0x3fffff00

minor corrections above if intending to use for documentation