[PATCH 11/14 v4] xen/arm: vpl011: Add support for vuart console in xenconsole

[Bhupinder Thakur <bhupinder.thakur@linaro.org>]

This patch finally adds the support for vuart console.

Signed-off-by: Bhupinder Thakur <bhupinder.thakur@linaro.org>
---

Changes since v3:
- The changes in xenconsole have been split into four patches. This is the fourth patch.
- The vuart console support is added under CONFIG_VUART_CONSOLE option.

 tools/console/Makefile    |  3 ++-
 tools/console/daemon/io.c | 26 +++++++++++++++++++++++++-
 2 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/tools/console/Makefile b/tools/console/Makefile
index c8b0300..fcee313 100644
--- a/tools/console/Makefile
+++ b/tools/console/Makefile
@@ -11,6 +11,7 @@ LDLIBS += $(SOCKET_LIBS)
 
 LDLIBS_xenconsoled += $(UTIL_LIBS)
 LDLIBS_xenconsoled += -lrt
+VUART_CFLAGS-$(CONFIG_VUART_CONSOLE) = -DCONFIG_VUART_CONSOLE
 
 BIN      = xenconsoled xenconsole
 
@@ -28,7 +29,7 @@ clean:
 distclean: clean
 
 daemon/main.o: daemon/_paths.h
-daemon/io.o: CFLAGS += $(CFLAGS_libxenevtchn) $(CFLAGS_libxengnttab)
+daemon/io.o: CFLAGS += $(CFLAGS_libxenevtchn) $(CFLAGS_libxengnttab) $(VUART_CFLAGS-y)
 xenconsoled: $(patsubst %.c,%.o,$(wildcard daemon/*.c))
 	$(CC) $(LDFLAGS) $^ -o $@ $(LDLIBS) $(LDLIBS_libxenevtchn) $(LDLIBS_libxengnttab) $(LDLIBS_xenconsoled) $(APPEND_LDFLAGS)
 
diff --git a/tools/console/daemon/io.c b/tools/console/daemon/io.c
index db73e10..cae2efe 100644
--- a/tools/console/daemon/io.c
+++ b/tools/console/daemon/io.c
@@ -104,12 +104,16 @@ struct console {
 	xenevtchn_port_or_error_t remote_port;
 	struct xencons_interface *interface;
 	struct domain *d;
+	bool optional;
+	bool prefer_gnttab;
 };
 
 struct console_data {
 	char *xsname;
 	char *ttyname;
 	char *log_suffix;
+	bool optional;
+	bool prefer_gnttab;
 };
 
 static struct console_data console_data[] = {
@@ -118,7 +122,18 @@ static struct console_data console_data[] = {
 		.xsname = "/console",
 		.ttyname = "tty",
 		.log_suffix = "",
+		.optional = false,
+		.prefer_gnttab = true,
 	},
+#if defined(CONFIG_VUART_CONSOLE)
+	{
+		.xsname = "/vuart/0",
+		.ttyname = "tty",
+		.log_suffix = "-vuart0",
+		.optional = true,
+		.prefer_gnttab = false,
+	},
+#endif
 };
 
 #define MAX_CONSOLE (sizeof(console_data)/sizeof(struct console_data))
@@ -665,7 +680,12 @@ static int console_create_ring(struct console *con)
 			"port", "%i", &remote_port,
 			NULL);
 	if (err)
+	{
+		/* If the console is optional then do not return an error. */
+		if (con->optional)
+			err = 0;
 		goto out;
+	}
 
 	snprintf(path, sizeof(path), "%s/type", con->xspath);
 	type = xs_read(xs, XBT_NULL, path, NULL);
@@ -679,7 +699,9 @@ static int console_create_ring(struct console *con)
 	if (ring_ref != con->ring_ref && con->ring_ref != -1)
 		console_unmap_interface(con);
 
-	if (!con->interface && xgt_handle) {
+	if (!con->interface && 
+		xgt_handle &&
+		con->prefer_gnttab) {
 		/* Prefer using grant table */
 		con->interface = xengnttab_map_grant_ref(xgt_handle,
 			dom->domid, GNTTAB_RESERVED_CONSOLE,
@@ -789,6 +811,8 @@ static int console_init(struct console *con, struct domain *dom, void **data)
 	con->d = dom;
 	con->ttyname = (*con_data)->ttyname;
 	con->log_suffix = (*con_data)->log_suffix;
+	con->optional = (*con_data)->optional;
+	con->prefer_gnttab = (*con_data)->prefer_gnttab;
 	con->xsname = (*con_data)->xsname;
 	con->xspath = xs_get_domain_path(xs, dom->domid);
 	s = realloc(con->xspath, strlen(con->xspath) +
-- 
2.7.4


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