linux-kernel - Re: [PATCH V3 13/20] cxl/mem: Refactor cxl pmem region auto-assembling

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Message-ID: <1296674576.21759726502325.JavaMail.epsvc@epcpadp1new>
Date: Mon, 29 Sep 2025 19:00:59 +0530
From: Neeraj Kumar <s.neeraj@...sung.com>
To: Dave Jiang <dave.jiang@...el.com>
Cc: linux-cxl@...r.kernel.org, nvdimm@...ts.linux.dev,
	linux-kernel@...r.kernel.org, gost.dev@...sung.com,
	a.manzanares@...sung.com, vishak.g@...sung.com, neeraj.kernel@...il.com,
	cpgs@...sung.com
Subject: Re: [PATCH V3 13/20] cxl/mem: Refactor cxl pmem region
 auto-assembling

On 23/09/25 03:37PM, Dave Jiang wrote:
>
>
>On 9/17/25 6:41 AM, Neeraj Kumar wrote:
>> In 84ec985944ef3, devm_cxl_add_nvdimm() sequence was changed and called
>> before devm_cxl_add_endpoint(). It's because cxl pmem region auto-assembly
>> used to get called at last in cxl_endpoint_port_probe(), which requires
>> cxl_nvd presence.
>>
>> For cxl region persistency, region creation happens during nvdimm_probe
>> which need the completion of endpoint probe.
>>
>> In order to accommodate both cxl pmem region auto-assembly and cxl region
>> persistency, refactored following
>>
>> 1. Re-Sequence devm_cxl_add_nvdimm() after devm_cxl_add_endpoint(). This
>>    will be called only after successful completion of endpoint probe.
>>
>> 2. Moved cxl pmem region auto-assembly from cxl_endpoint_port_probe() to
>>    cxl_mem_probe() after devm_cxl_add_nvdimm(). It gurantees both the
>>    completion of endpoint probe and cxl_nvd presence before its call.
>
>Given that we are going forward with this implementation [1] from Dan and drivers like the type2 enabling are going to be using it as well, can you please consider converting this change to Dan's mechanism instead of creating a whole new one?
>
>I think the region discovery can be done via the ops->probe() callback. Thanks.
>
>[1]: https://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git/commit/?h=for-6.18/cxl-probe-order&id=88aec5ea7a24da00dc92c7778df4851fe4fd3ec6
>
>DJ
>

Sure, Let me revisit this.
It seems [1] is there in seperate branch "for-6.18/cxl-probe-order", and not yet merged into next, right?


Regards,
Neeraj