linux-kernel - [PATCH V2 17/20] cxl/pmem: Preserve region information into nd

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Message-Id: <20250730121209.303202-18-s.neeraj@samsung.com>
Date: Wed, 30 Jul 2025 17:42:06 +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 17/20] cxl/pmem: Preserve region information into nd_set

Save region information stored in cxlr to nd_set during
cxl_pmem_region_probe in nd_set. This saved region information is being
stored into LSA, which will be used for cxl region persistence

Signed-off-by: Neeraj Kumar <s.neeraj@...sung.com>
---
 drivers/cxl/pmem.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/cxl/pmem.c b/drivers/cxl/pmem.c
index e197883690ef..38a5bcdc68ce 100644
--- a/drivers/cxl/pmem.c
+++ b/drivers/cxl/pmem.c
@@ -377,6 +377,7 @@ static int cxl_pmem_region_probe(struct device *dev)
 	struct nd_mapping_desc mappings[CXL_DECODER_MAX_INTERLEAVE];
 	struct cxl_pmem_region *cxlr_pmem = to_cxl_pmem_region(dev);
 	struct cxl_region *cxlr = cxlr_pmem->cxlr;
+	struct cxl_region_params *p = &cxlr->params;
 	struct cxl_nvdimm_bridge *cxl_nvb = cxlr->cxl_nvb;
 	struct cxl_pmem_region_info *info = NULL;
 	struct nd_interleave_set *nd_set;
@@ -465,12 +466,12 @@ static int cxl_pmem_region_probe(struct device *dev)
 	ndr_desc.num_mappings = cxlr_pmem->nr_mappings;
 	ndr_desc.mapping = mappings;
 
-	/*
-	 * TODO enable CXL labels which skip the need for 'interleave-set cookie'
-	 */
-	nd_set->cookie1 =
-		nd_fletcher64(info, sizeof(*info) * cxlr_pmem->nr_mappings, 0);
-	nd_set->cookie2 = nd_set->cookie1;
+	nd_set->uuid = p->uuid;
+	nd_set->interleave_ways = p->interleave_ways;
+	nd_set->interleave_granularity = p->interleave_granularity;
+	nd_set->res = p->res;
+	nd_set->nr_targets =  p->nr_targets;
+
 	ndr_desc.nd_set = nd_set;
 
 	cxlr_pmem->nd_region =
-- 
2.34.1