[RFC v2 1/2] s390/cio: handle changes related to endpoint security

[Vineeth Vijayan <vneethv@xxxxxxxxxxxxx>]

From: Sebastian Ott <sebott@xxxxxxxxxxxxx>

Reference-ID: IO1812
Signed-off-by: Sebastian Ott <sebott@xxxxxxxxxxxxx>
---
 drivers/s390/cio/chsc.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/drivers/s390/cio/chsc.c b/drivers/s390/cio/chsc.c
index b7256ea5b669..6218bcb8d21f 100644
--- a/drivers/s390/cio/chsc.c
+++ b/drivers/s390/cio/chsc.c
@@ -566,6 +566,36 @@ static void chsc_process_sei_ap_cfg_chg(struct chsc_sei_nt0_area *sei_area)
 	ap_bus_cfg_chg();
 }
 
+static void chsc_process_sei_esc_change(struct chsc_sei_nt0_area *sei_area)
+{
+	struct channel_path *chp;
+	struct chp_id chpid;
+	int status;
+
+	CIO_CRW_EVENT(4, "chsc: endpoint security status notification (rs=%02x, "
+		      "rs_id=%04x, esc=%x)\n", sei_area->rs, sei_area->rsid,
+		      sei_area->ccdf[0]);
+	if (sei_area->rs != 4)
+		return;
+	chp_id_init(&chpid);
+	chpid.id = sei_area->rsid;
+	/* allocate a new channel path structure, if needed */
+	status = chp_get_status(chpid);
+	if (!status)
+		return;
+
+	if (status < 0) {
+		chp_new(chpid);
+	} else {
+		chp = chpid_to_chp(chpid);
+		mutex_lock(&chp->lock);
+		chp_update_desc(chp);
+		mutex_unlock(&chp->lock);
+	}
+
+	/* notify driver? check I/O? */
+}
+
 static void chsc_process_sei_nt2(struct chsc_sei_nt2_area *sei_area)
 {
 	switch (sei_area->cc) {
@@ -607,6 +637,9 @@ static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area)
 	case 14: /* scm available notification */
 		chsc_process_sei_scm_avail(sei_area);
 		break;
+	case 15: /* endpoint security status update notification */
+		chsc_process_sei_esc_change(sei_area);
+		break;
 	default: /* other stuff */
 		CIO_CRW_EVENT(2, "chsc: sei nt0 unhandled cc=%d\n",
 			      sei_area->cc);
-- 
2.17.1