[PATCH V5 05/17] nvdimm/label: Skip region label during ns label DPA reservation

[Neeraj Kumar]

CXL 3.2 Spec mentions CXL LSA 2.1 Namespace Labels at section
9.13.2.5. If Namespace label is present in LSA during
nvdimm_probe() then dimm-physical-address(DPA) reservation is
required. But this reservation is not required by cxl region
label. Therefore if LSA scanning finds any region label, skip it.

Reviewed-by: Dave Jiang <dave.jiang@xxxxxxxxx>
Signed-off-by: Neeraj Kumar <s.neeraj@xxxxxxxxxxx>
---
 drivers/nvdimm/label.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c
index 9854cb45fb62..169692dfa12c 100644
--- a/drivers/nvdimm/label.c
+++ b/drivers/nvdimm/label.c
@@ -469,6 +469,14 @@ int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd)
 		lsa_label = to_lsa_label(ndd, slot);
 		nd_label = &lsa_label->ns_label;
 
+		/*
+		 * Skip region label. If LSA label is region label
+		 * then it don't require dimm-physical-address(DPA)
+		 * reservation. Whereas its required for namespace label
+		 */
+		if (is_region_label(ndd, lsa_label))
+			continue;
+
 		if (!slot_valid(ndd, lsa_label, slot))
 			continue;
 
-- 
2.34.1