linux-kernel - Re: [PATCH 2/2] cxl/core: Add a helper function to check dpa availability

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Message-ID: <03c83257-defd-4083-970b-9b803442e792@zohomail.com>
Date: Mon, 30 Jun 2025 12:56:48 +0800
From: Li Ming <ming.li@...omail.com>
To: Alison Schofield <alison.schofield@...el.com>
Cc: dave@...olabs.net, jonathan.cameron@...wei.com, dave.jiang@...el.com,
 vishal.l.verma@...el.com, ira.weiny@...el.com, dan.j.williams@...el.com,
 shiju.jose@...wei.com, linux-cxl@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] cxl/core: Add a helper function to check dpa
 availability

On 6/30/2025 9:41 AM, Alison Schofield wrote:
> On Sun, Jun 29, 2025 at 04:20:42PM +0800, Li Ming wrote:
>> In CXL subsystem, many pieces of code that need to check dpa
>> availability in case using wrong dpa. Add a helper function called
>> is_valid_dpa() for dpa availability checking.
> Does this have anything DPA special about it. Could it be done in
I think no special DPA here, my understanding is that all DPA should be included in cxlds->dpa_res.
> in a new helper like resource_contains_addr() for all to employ.
> In CXL, we'd use it in at least one more place, checking for HPA
> in a region resource. 
That is a good idea, I will add it into include/linux/ioport.h
>
> -- Alison
>

Ming

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