[PATCH V5 09/17] nvdimm/label: Export routine to fetch region information

Neeraj Kumar
2026-01-09T12:45:26Z

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

Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Neeraj Kumar <s.neeraj@samsung.com>
---
drivers/nvdimm/dimm_devs.c | 12 ++++++++++++
include/linux/libnvdimm.h | 2 ++
2 files changed, 14 insertions(+)

diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
index 3363a97cc5b5..e1c95da92fbf 100644
--- a/drivers/nvdimm/dimm_devs.c
+++ b/drivers/nvdimm/dimm_devs.c
@@ -280,6 +280,18 @@ void *nvdimm_provider_data(struct nvdimm *nvdimm)
}
EXPORT_SYMBOL_GPL(nvdimm_provider_data);

+bool nvdimm_has_cxl_region(struct nvdimm *nvdimm)
+{
+ return nvdimm->is_region_label;
+}
+EXPORT_SYMBOL_GPL(nvdimm_has_cxl_region);
+
+void *nvdimm_get_cxl_region_param(struct nvdimm *nvdimm)
+{
+ return &nvdimm->cxl_region_params;
+}
+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