cxl/mem: Introduce security state sysfs file

Add a read-only sysfs file to display the security state
of a device (currently only pmem):

    /sys/bus/cxl/devices/memX/security/state

This introduces a cxl_security_state structure that is
to be the placeholder for common CXL security features.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Fan Ni <fan.ni@samsung.com>
Signed-off-by: Davidlohr Bueso <dave@stgolabs.net>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/20230612181038.14421-3-dave@stgolabs.net
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h
index 1d8e81c87c6a..091f1200736b 100644
--- a/drivers/cxl/cxlmem.h
+++ b/drivers/cxl/cxlmem.h
@@ -261,6 +261,15 @@ struct cxl_poison_state {
 };
 
 /**
+ * struct cxl_security_state - Device security state
+ *
+ * @state: state of last security operation
+ */
+struct cxl_security_state {
+	unsigned long state;
+};
+
+/**
  * struct cxl_dev_state - The driver device state
  *
  * cxl_dev_state represents the CXL driver/device state.  It provides an
@@ -336,6 +345,7 @@ struct cxl_dev_state {
 
 	struct cxl_event_state event;
 	struct cxl_poison_state poison;
+	struct cxl_security_state security;
 
 	struct rcuwait mbox_wait;
 	int (*mbox_send)(struct cxl_dev_state *cxlds, struct cxl_mbox_cmd *cmd);