linux-kernel - [PATCH V3 12/20] nvdimm/region_label: Export routine to fetch region information

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Message-Id: <20250917134116.1623730-13-s.neeraj@samsung.com>
Date: Wed, 17 Sep 2025 19:11:08 +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,
	cpgs@...sung.com, Neeraj Kumar <s.neeraj@...sung.com>
Subject: [PATCH V3 12/20] nvdimm/region_label: Export routine to fetch
 region information

CXL region information preserved from the LSA needs to be exported for
use by the CXL driver for CXL region re-creation.

Signed-off-by: Neeraj Kumar <s.neeraj@...sung.com>
---
 drivers/nvdimm/dimm_devs.c | 18 ++++++++++++++++++
 include/linux/libnvdimm.h  |  2 ++
 2 files changed, 20 insertions(+)

diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
index 918c3db93195..619c8ce56dce 100644
--- a/drivers/nvdimm/dimm_devs.c
+++ b/drivers/nvdimm/dimm_devs.c
@@ -280,6 +280,24 @@ void *nvdimm_provider_data(struct nvdimm *nvdimm)
 }
 EXPORT_SYMBOL_GPL(nvdimm_provider_data);
 
+bool nvdimm_has_cxl_region(struct nvdimm *nvdimm)
+{
+	if (nvdimm)
+		return nvdimm->is_region_label;
+
+	return false;
+}
+EXPORT_SYMBOL_GPL(nvdimm_has_cxl_region);
+
+void *nvdimm_get_cxl_region_param(struct nvdimm *nvdimm)
+{
+	if (nvdimm)
+		return &nvdimm->cxl_region_params;
+
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(nvdimm_get_cxl_region_param);
+
 static ssize_t commands_show(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {
diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
index 07ea2e3f821a..3ffd50ab6ac4 100644
--- a/include/linux/libnvdimm.h
+++ b/include/linux/libnvdimm.h
@@ -330,6 +330,8 @@ int nvdimm_in_overwrite(struct nvdimm *nvdimm);
 bool is_nvdimm_sync(struct nd_region *nd_region);
 int nd_region_label_update(struct nd_region *nd_region);
 int nd_region_label_delete(struct nd_region *nd_region);
+bool nvdimm_has_cxl_region(struct nvdimm *nvdimm);
+void *nvdimm_get_cxl_region_param(struct nvdimm *nvdimm);
 
 static inline int nvdimm_ctl(struct nvdimm *nvdimm, unsigned int cmd, void *buf,
 		unsigned int buf_len, int *cmd_rc)
-- 
2.34.1