linux-kernel - [PATCH V2 04/20] nvdimm/label: CXL labels skip the need for 'interleave-set cookie'

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Message-Id: <20250730121209.303202-5-s.neeraj@samsung.com>
Date: Wed, 30 Jul 2025 17:41:53 +0530
From: Neeraj Kumar <s.neeraj@...sung.com>
To: 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,
	Neeraj Kumar <s.neeraj@...sung.com>
Subject: [PATCH V2 04/20] nvdimm/label: CXL labels skip the need for
 'interleave-set cookie'

CXL LSA v2.1 utilizes the region labels stored in the LSA for interleave
set configuration instead of interleave-set cookie used in previous LSA
versions. As interleave-set cookie is not required for CXL LSA v2.1 format
so skip its usage for CXL LSA 2.1 format

Signed-off-by: Neeraj Kumar <s.neeraj@...sung.com>
---
 drivers/nvdimm/namespace_devs.c | 3 ++-
 drivers/nvdimm/region_devs.c    | 5 +++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index bdf1ed6f23d8..5b73119dc8fd 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -1692,7 +1692,8 @@ static struct device *create_namespace_pmem(struct nd_region *nd_region,
 	int rc = 0;
 	u16 i;
 
-	if (cookie == 0) {
+	/* CXL labels skip the need for 'interleave-set cookie' */
+	if (!ndd->cxl && cookie == 0) {
 		dev_dbg(&nd_region->dev, "invalid interleave-set-cookie\n");
 		return ERR_PTR(-ENXIO);
 	}
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index de1ee5ebc851..2debe60f8bf0 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -858,6 +858,11 @@ u64 nd_region_interleave_set_cookie(struct nd_region *nd_region,
 	if (!nd_set)
 		return 0;
 
+	/* CXL labels skip the need for 'interleave-set cookie' */
+	if (nsindex && __le16_to_cpu(nsindex->major) == 2
+			&& __le16_to_cpu(nsindex->minor) == 1)
+		return 0;
+
 	if (nsindex && __le16_to_cpu(nsindex->major) == 1
 			&& __le16_to_cpu(nsindex->minor) == 1)
 		return nd_set->cookie1;
-- 
2.34.1