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

Neeraj Kumar
2025-09-17T13:41:41Z

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@samsung.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);
+}
+
+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);
+}
+
+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);
+}
+
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,
--
2.34.1