igsc: lib: send no update message at the end of firmware update

This message is sent by the SW in order to indicate that no immediate
firmware update is expected and the firmware is free to move to
the graphics security mode providing all other prerequisites for
the transitions are met. There is no response to this message and
the device may undergo additional reset.

Signed-off-by: Vitaly Lubart <vitaly.lubart@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>

Author: vlubart

lib/igsc_heci.h

@@ -268,6 +268,17 @@ struct gsc_fwu_heci_end_resp {
     struct gsc_fwu_heci_response response;
 };
 
+/**
+ * @brief firmware no update message
+ *
+ * @param header @ref gsc_fwu_heci_header
+ * @param reserved reserved
+ */
+struct gsc_fwu_heci_no_update_req {
+    struct gsc_fwu_heci_header header;
+    uint32_t                   reserved;
+};
+
 /** @} */
 
 #pragma pack()

lib/igsc_lib.c

@@ -559,6 +559,43 @@ int gsc_tee_command(struct igsc_lib_ctx *lib_ctx,
     return status;
 }
 
+static int gsc_send_no_update(struct igsc_lib_ctx *lib_ctx)
+{
+    TEESTATUS tee_status;
+    int status;
+    size_t request_len;
+    struct gsc_fwu_heci_no_update_req *req;
+
+    req = (struct gsc_fwu_heci_no_update_req *)lib_ctx->working_buffer;
+    request_len = sizeof(*req);
+
+    status = gsc_fwu_buffer_validate(lib_ctx, request_len, 0);
+    if (status != IGSC_SUCCESS)
+    {
+        return status;
+    }
+
+    memset(req, 0, request_len);
+    req->header.command_id = GSC_FWU_HECI_COMMAND_ID_NO_UPDATE;
+    req->reserved = 0;
+
+    gsc_debug_hex_dump("Sending:", (unsigned char *)req, request_len);
+
+    tee_status = TeeWrite(&lib_ctx->driver_handle, req, request_len, NULL, 0);
+    if (!TEE_IS_SUCCESS(tee_status))
+    {
+        gsc_error("Error in HECI write (%d)\n", tee_status);
+        status = status_tee2fu(tee_status);
+        goto exit;
+    }
+
+    status = IGSC_SUCCESS;
+
+exit:
+    return status;
+
+}
+
 static int gsc_fwu_get_version(struct igsc_lib_ctx *lib_ctx,
                                uint32_t partition,
                                uint8_t *version, size_t version_length)
@@ -1373,6 +1410,20 @@ static int gsc_update(IN struct igsc_device_handle *handle,
     if (payload_type == GSC_FWU_HECI_PAYLOAD_TYPE_GFX_FW)
     {
         ret = driver_reconnect(lib_ctx);
+
+        if (ret == IGSC_SUCCESS)
+        {
+            /* After the reconnect - send 'no update' message */
+            ret = gsc_send_no_update(lib_ctx);
+            if (ret != IGSC_SUCCESS)
+            {
+               gsc_error("failed to send 'no update' message after reset\n");
+            }
+        }
+        else
+        {
+            gsc_error("failed to reconnect to the driver after reset\n");
+        }
     }
 
 exit: