linux-kernel - Re: [RFC PATCH 15/20] cxl: Add a routine to find cxl root decoder on cxl bus

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Message-ID: <439928219.101752909483341.JavaMail.epsvc@epcpadp2new>
Date: Fri, 18 Jul 2025 18:18:05 +0530
From: Neeraj Kumar <s.neeraj@...sung.com>
To: Dave Jiang <dave.jiang@...el.com>
Cc: dan.j.williams@...el.com, dave@...olabs.net,
	jonathan.cameron@...wei.com, alison.schofield@...el.com,
	vishal.l.verma@...el.com, ira.weiny@...el.com, a.manzanares@...sung.com,
	nifan.cxl@...il.com, anisa.su@...sung.com, vishak.g@...sung.com,
	krish.reddy@...sung.com, arun.george@...sung.com, alok.rathore@...sung.com,
	neeraj.kernel@...il.com, linux-kernel@...r.kernel.org,
	linux-cxl@...r.kernel.org, nvdimm@...ts.linux.dev, gost.dev@...sung.com,
	cpgs@...sung.com
Subject: Re: [RFC PATCH 15/20] cxl: Add a routine to find cxl root decoder
 on cxl bus

On 10/07/25 09:23AM, Dave Jiang wrote:
>
>
>On 6/17/25 5:39 AM, Neeraj Kumar wrote:
>> Add cxl_find_root_decoder to find root decoder on cxl bus. It is used to
>> find root decoder during region creation
>>
>> Signed-off-by: Neeraj Kumar <s.neeraj@...sung.com>
>> ---
>>  drivers/cxl/core/port.c | 26 ++++++++++++++++++++++++++
>>  drivers/cxl/cxl.h       |  1 +
>>  2 files changed, 27 insertions(+)
>>
>> diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c
>> index 2452f7c15b2d..94d9322b8e38 100644
>> --- a/drivers/cxl/core/port.c
>> +++ b/drivers/cxl/core/port.c
>> @@ -513,6 +513,32 @@ struct cxl_switch_decoder *to_cxl_switch_decoder(struct device *dev)
>>  }
>>  EXPORT_SYMBOL_NS_GPL(to_cxl_switch_decoder, "CXL");
>>
>> +static int match_root_decoder(struct device *dev, void *data)
>> +{
>> +	return is_root_decoder(dev);
>> +}
>> +
>> +/**
>> + * cxl_find_root_decoder() - find a cxl root decoder on cxl bus
>> + * @port: any descendant port in root-cxl-port topology
>
>s/root-cxl-port/CXL port/
>
>Please add a comment noting that the caller of this function must call put_device() when done as a device ref is taken via device_find_child().
>

Thanks Dave for pointing this, Sure I will update it accordingly.


>> + */
>> +struct cxl_root_decoder *cxl_find_root_decoder(struct cxl_port *port)
>
>cxl_port_find_root_decoder(). There is a cxl_find_root_decoder() already in core/region.c and could cause potential symbol clash.
>
>DJ
>

Sure Dave, I will rename it while rebasing for next patch-set


Regards,
Neeraj