linux-kernel - Re: [PATCH v2 03/18] cxl/pci: cxl_hdm_decode

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Message-ID: <Z6nd6Hwi7wP4QxVH@rric.localdomain>
Date: Mon, 10 Feb 2025 12:07:20 +0100
From: Robert Richter <rrichter@....com>
To: Gregory Price <gourry@...rry.net>
Cc: Jim Kao <jim.kao@...nn-tech.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>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Dave Jiang <dave.jiang@...el.com>,
	Davidlohr Bueso <dave@...olabs.net>,
	"linux-cxl@...r.kernel.org" <linux-cxl@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Fabio M. De Francesco" <fabio.m.de.francesco@...ux.intel.com>,
	Terry Bowman <terry.bowman@....com>
Subject: Re: [PATCH v2 03/18] cxl/pci: cxl_hdm_decode_init: Move comment

On 07.02.25 17:19:50, Gregory Price wrote:
> On Fri, Feb 07, 2025 at 09:36:08PM +0000, Jim Kao wrote:
> > Do we have any limitation for HDM Decoder Range in Linux Kernel ?
> > We has observed that Linux might be hung if range is larger than 8TB.
> > 
> > Jim
> > 
> 
> Do you have any additional details? dmesg/core dumps, etc?
> 
> Seems pretty suspicious that it happens right on the 44-bit boundary.

I am not aware of limitations from CXL spec or driver. AMD platforms
support a much larger physical address range.

-Robert