linux-kernel - Re: [PATCH V3 05/20] nvdimm/namespace_label: Add namespace label changes as per CXL LSA v2.1

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Message-ID: <3bfaf4e6-739f-4998-8343-770ef3ab3791@intel.com>
Date: Fri, 19 Sep 2025 16:59:23 -0700
From: Dave Jiang <dave.jiang@...el.com>
To: Neeraj Kumar <s.neeraj@...sung.com>, linux-cxl@...r.kernel.org,
 nvdimm@...ts.linux.dev, linux-kernel@...r.kernel.org, gost.dev@...sung.com
Cc: a.manzanares@...sung.com, vishak.g@...sung.com, neeraj.kernel@...il.com,
 cpgs@...sung.com
Subject: Re: [PATCH V3 05/20] nvdimm/namespace_label: Add namespace label
 changes as per CXL LSA v2.1



On 9/17/25 6:41 AM, Neeraj Kumar wrote:
> CXL 3.2 Spec mentions CXL LSA 2.1 Namespace Labels at section 9.13.2.5
> Modified __pmem_label_update function using setter functions to update
> namespace label as per CXL LSA 2.1
> 
> Signed-off-by: Neeraj Kumar <s.neeraj@...sung.com>
> ---
>  drivers/nvdimm/label.c |  3 +++
>  drivers/nvdimm/nd.h    | 23 +++++++++++++++++++++++
>  2 files changed, 26 insertions(+)
> 
> diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c
> index 3235562d0e1c..182f8c9a01bf 100644
> --- a/drivers/nvdimm/label.c
> +++ b/drivers/nvdimm/label.c
> @@ -924,6 +924,7 @@ static int __pmem_label_update(struct nd_region *nd_region,
>  
>  	nd_label = to_label(ndd, slot);
>  	memset(nd_label, 0, sizeof_namespace_label(ndd));
> +	nsl_set_type(ndd, nd_label);
>  	nsl_set_uuid(ndd, nd_label, nspm->uuid);
>  	nsl_set_name(ndd, nd_label, nspm->alt_name);
>  	nsl_set_flags(ndd, nd_label, flags);
> @@ -935,7 +936,9 @@ static int __pmem_label_update(struct nd_region *nd_region,
>  	nsl_set_lbasize(ndd, nd_label, nspm->lbasize);
>  	nsl_set_dpa(ndd, nd_label, res->start);
>  	nsl_set_slot(ndd, nd_label, slot);
> +	nsl_set_alignment(ndd, nd_label, 0);
>  	nsl_set_type_guid(ndd, nd_label, &nd_set->type_guid);
> +	nsl_set_region_uuid(ndd, nd_label, NULL);
>  	nsl_set_claim_class(ndd, nd_label, ndns->claim_class);
>  	nsl_calculate_checksum(ndd, nd_label);
>  	nd_dbg_dpa(nd_region, ndd, res, "\n");
> diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
> index 158809c2be9e..e362611d82cc 100644
> --- a/drivers/nvdimm/nd.h
> +++ b/drivers/nvdimm/nd.h
> @@ -295,6 +295,29 @@ static inline const u8 *nsl_uuid_raw(struct nvdimm_drvdata *ndd,
>  	return nd_label->efi.uuid;
>  }
>  
> +static inline void nsl_set_type(struct nvdimm_drvdata *ndd,
> +				struct nd_namespace_label *ns_label)
> +{
> +	if (ndd->cxl && ns_label)
> +		uuid_parse(CXL_NAMESPACE_UUID, (uuid_t *) ns_label->cxl.type);

Personally would prefer something like:

if (!(ndd->cxl && ns_label))
	return;
uuid_parse(....);

Also, no space needed after casting.

> +}
> +
> +static inline void nsl_set_alignment(struct nvdimm_drvdata *ndd,
> +				     struct nd_namespace_label *ns_label,
> +				     u32 align)
> +{
> +	if (ndd->cxl)
> +		ns_label->cxl.align = __cpu_to_le32(align);

same comment as above
> +}
> +
> +static inline void nsl_set_region_uuid(struct nvdimm_drvdata *ndd,
> +				       struct nd_namespace_label *ns_label,
> +				       const uuid_t *uuid)
> +{
> +	if (ndd->cxl && uuid)
> +		export_uuid(ns_label->cxl.region_uuid, uuid);

same comment as above

> +}
> +
>  bool nsl_validate_type_guid(struct nvdimm_drvdata *ndd,
>  			    struct nd_namespace_label *nd_label, guid_t *guid);
>  enum nvdimm_claim_class nsl_get_claim_class(struct nvdimm_drvdata *ndd,