linux-kernel - Re: [RFC PATCH] resource: Fix CXL node not populated issue

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Message-ID: <2b5bb8d8-6a7d-4a58-bde7-ce42d0a23f61@amd.com>
Date: Fri, 6 Dec 2024 13:58:23 +0530
From: Raghavendra K T <raghavendra.kt@....com>
To: Dan Williams <dan.j.williams@...el.com>, linux-kernel@...r.kernel.org,
 linux-cxl@...r.kernel.org
Cc: bharata@....com, Huang Ying <ying.huang@...el.com>,
 Andrew Morton <akpm@...ux-foundation.org>,
 David Hildenbrand <david@...hat.com>, Davidlohr Bueso <dave@...olabs.net>,
 Jonathan Cameron <jonathan.cameron@...wei.com>,
 Dave Jiang <dave.jiang@...el.com>,
 Alison Schofield <alison.schofield@...el.com>,
 Vishal Verma <vishal.l.verma@...el.com>, Ira Weiny <ira.weiny@...el.com>,
 Alistair Popple <apopple@...dia.com>,
 Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
 Bjorn Helgaas <bhelgaas@...gle.com>, Baoquan He <bhe@...hat.com>,
 ilpo.jarvinen@...ux.intel.com,
 Mika Westerberg <mika.westerberg@...ux.intel.com>,
 Fontenot Nathan <Nathan.Fontenot@....com>, Wei Huang <wei.huang2@....com>,
 regressions@...ts.linux.dev
Subject: Re: [RFC PATCH] resource: Fix CXL node not populated issue



On 12/6/2024 1:20 PM, Dan Williams wrote:
> Raghavendra K T wrote:
>>
[...]
>> B. /proc/iomem
>>
>> $ vimdiff success fail
>>
>>    4050000000-604fffffff : Soft Reserved
>>     |  164 4050000000-604fffffff : Soft Reserved
>>     165   4050000000-604fffffff : CXL Window 0
>>          |  165   4050000000-604fffffff : CXL Window 0
>>     166     4080000000-5fffffffff : dax1.0
>>          |
>> ------------------------------------------------------------------------
>>     167       4080000000-5fffffffff : System RAM (kmem)
>>          |
>> --------------------------------------------------------------------
> 
> My eyes only know how to read unified diff (diff -u) format. Is this
> saying that in the failure case the System RAM range for dax1.0 is
> missing?


Sorry for that formatting. I realized later.
Yes. dax1.0 missing in the failure case.

Looks like problem is that,

4050000000-604fffffff : Soft Reserved
   4050000000-604fffffff : CXL Window 0
      4080000000-5fffffffff : dax1.0
         4080000000-5fffffffff : System RAM (kmem)

this use case where,

|A<------------->D|  CXL window
|..|B<-->C|.......|    kmem

B->C range that falls within A->D as in above somehow
not covered after the patch.

Thanks and Regards
- Raghu