Add provider name in order to associate cxl test dimm from cxl_test to the
cxl pmem device when going through sysfs for security testing.

Signed-off-by: Dave Jiang <[email protected]>
---
 Documentation/ABI/testing/sysfs-bus-nvdimm |    6 ++++++
 drivers/cxl/pmem.c                         |   10 ++++++++++
 2 files changed, 16 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-nvdimm 
b/Documentation/ABI/testing/sysfs-bus-nvdimm
index 91945211e53b..d78e4553d9af 100644
--- a/Documentation/ABI/testing/sysfs-bus-nvdimm
+++ b/Documentation/ABI/testing/sysfs-bus-nvdimm
@@ -47,3 +47,9 @@ Date:         November 2022
 KernelVersion: 6.2
 Contact:       Dave Jiang <[email protected]>
 Description:   (RO) Show the id (serial) of the device.
+
+What:          /sys/bus/nd/devices/nmemX/provider
+Date:          November 2022
+KernelVersion: 6.2
+Contact:       Dave Jiang <[email protected]>
+Description:   (RO) Shows the provider for the device. (i.e. ACPI.NFIT, 
ACPI.CXL)
diff --git a/drivers/cxl/pmem.c b/drivers/cxl/pmem.c
index 9209c7dd72d0..322f834cc27d 100644
--- a/drivers/cxl/pmem.c
+++ b/drivers/cxl/pmem.c
@@ -48,6 +48,15 @@ static void unregister_nvdimm(void *nvdimm)
        cxl_nvd->bridge = NULL;
 }
 
+static ssize_t provider_show(struct device *dev, struct device_attribute 
*attr, char *buf)
+{
+       struct nvdimm *nvdimm = to_nvdimm(dev);
+       struct cxl_nvdimm *cxl_nvd = nvdimm_provider_data(nvdimm);
+
+       return sysfs_emit(buf, "%s\n", dev_name(&cxl_nvd->dev));
+}
+static DEVICE_ATTR_RO(provider);
+
 static ssize_t id_show(struct device *dev, struct device_attribute *attr, char 
*buf)
 {
        struct nvdimm *nvdimm = to_nvdimm(dev);
@@ -60,6 +69,7 @@ static DEVICE_ATTR_RO(id);
 
 static struct attribute *cxl_dimm_attributes[] = {
        &dev_attr_id.attr,
+       &dev_attr_provider.attr,
        NULL
 };
 



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