linux-kernel - Re: [PATCH v6 00/11] cxl: ACPI PRM Address Translation Support and AMD Zen5 enablement

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Message-ID: <aSW1MlUSs2jjdVjO@gourry-fedora-PF4VCD3F>
Date: Tue, 25 Nov 2025 08:54:58 -0500
From: Gregory Price <gourry@...rry.net>
To: Alison Schofield <alison.schofield@...el.com>
Cc: Robert Richter <rrichter@....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 v6 00/11] cxl: ACPI PRM Address Translation Support and
 AMD Zen5 enablement

On Mon, Nov 24, 2025 at 07:26:51PM -0800, Alison Schofield wrote:
> On Mon, Nov 24, 2025 at 03:10:07PM -0500, Gregory Price wrote:
> > 
> > IIRC the to_spa() function wouldn't be populated (will be NULL) if this
> > is the case, so you wouldn't even be able to call the translation
> > function.
> 
> The hpa_to_spa fn defined as a root decoder ops is an additional layer for
> arch's needing HPA to SPA translation. It's optional. If there is no
> hpa_to_spa fn, then it is assumed that the CXL HPA==SPA and that is the
> 'final answer'  added to the trace log.
> 
> Sounds like you are on one of these systems, so maybe you could take a
> look at what happens. If your devices support, try to inject and/or
> clear poison and see the resulting kernel trace log. There is an
> example for that here:
> https://github.com/pmem/ndctl/blob/main/test/cxl-poison.sh
> 

Servers am able to test on are @ 6.16 with cxl .17+.18 backports

I don't see: /sys/kernel/debug/cxl/$dev/${action}_poison
in my sysfs

Have enabled enabling various debug and einj options.

When were these added? Am i missing build options?

~Gregory