[PATCH 21/25 v6] xen/arm: vpl011: Add support for multiple consoles in xenconsole

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

This patch adds the support for multiple consoles and introduces the iterator
functions to operate on multiple consoles.

This patch is in preparation to support a new vuart console.

Signed-off-by: Bhupinder Thakur <bhupinder.thakur@linaro.org>
---
CC: Ian Jackson <ian.jackson@eu.citrix.com>
CC: Wei Liu <wei.liu2@citrix.com>
CC: Stefano Stabellini <sstabellini@kernel.org>
CC: Julien Grall <julien.grall@arm.com>

Changes since v5:
- Split this patch in multiple smaller patches.

Changes since v4:
- Changes to make event channel handling per console rather than per domain.

Changes since v3:
- The changes in xenconsole have been split into four patches. This is the third patch.

 tools/console/daemon/io.c | 174 +++++++++++++++++++++++++++++++++++-----------
 1 file changed, 134 insertions(+), 40 deletions(-)

diff --git a/tools/console/daemon/io.c b/tools/console/daemon/io.c
index 54c91aa..49f085c 100644
--- a/tools/console/daemon/io.c
+++ b/tools/console/daemon/io.c
@@ -90,12 +90,14 @@ struct buffer {
 };
 
 struct console {
+	const char *const ttyname;
 	int master_fd;
 	int master_pollfd_idx;
 	int slave_fd;
 	int log_fd;
 	struct buffer buffer;
-	char *xspath;
+	const char *const xspath;
+	const char *const log_suffix;
 	int ring_ref;
 	xenevtchn_handle *xce_handle;
 	int xce_pollfd_idx;
@@ -107,21 +109,112 @@ struct console {
 	struct domain *d;
 };
 
+struct console_data {
+	const char *const xsname;
+	const char *const ttyname;
+	const char *const log_suffix;
+};
+
+static struct console_data console_data[] = {
+	{
+		.xsname = "/console",
+		.ttyname = "tty",
+		.log_suffix = "",
+	},
+};
+
+#define MAX_CONSOLE (sizeof(console_data)/sizeof(struct console_data))
+
 struct domain {
 	int domid;
 	bool is_dead;
 	unsigned last_seen;
 	struct domain *next;
-	struct console console;
+	struct console console[MAX_CONSOLE];
 };
 
 static struct domain *dom_head;
 
+typedef void (*VOID_ITER_FUNC_ARG1)(struct console *);
+typedef bool (*BOOL_ITER_FUNC_ARG1)(struct console *);
+typedef int (*INT_ITER_FUNC_ARG1)(struct console *);
+typedef void (*VOID_ITER_FUNC_ARG2)(struct console *,  void *);
+typedef int (*INT_ITER_FUNC_ARG3)(struct console *,
+				  struct domain *dom, void **);
+
 static inline bool console_enabled(struct console *con)
 {
 	return con->local_port != -1;
 }
 
+static inline void console_iter_void_arg1(struct domain *d,
+					  VOID_ITER_FUNC_ARG1 iter_func)
+{
+	int i = 0;
+	struct console *con = &d->console[0];
+
+	for (i = 0; i < MAX_CONSOLE; i++, con++)
+	{
+		iter_func(con);
+	}
+}
+
+static inline void console_iter_void_arg2(struct domain *d,
+					  VOID_ITER_FUNC_ARG2 iter_func,
+					  void *iter_data)
+{
+	int i = 0;
+	struct console *con = &d->console[0];
+
+	for (i = 0; i < MAX_CONSOLE; i++, con++)
+	{
+		iter_func(con, iter_data);
+	}
+}
+
+static inline bool console_iter_bool_arg1(struct domain *d,
+					  BOOL_ITER_FUNC_ARG1 iter_func)
+{
+	int i = 0;
+	struct console *con = &d->console[0];
+
+	for (i = 0; i < MAX_CONSOLE; i++, con++)
+	{
+		if (iter_func(con))
+			return true;
+	}
+	return false;
+}
+
+static inline int console_iter_int_arg1(struct domain *d,
+					INT_ITER_FUNC_ARG1 iter_func)
+{
+	int i = 0;
+	struct console *con = &d->console[0];
+
+	for (i = 0; i < MAX_CONSOLE; i++, con++)
+	{
+		if (iter_func(con))
+			return 1;
+	}
+	return 0;
+}
+
+static inline int console_iter_int_arg3(struct domain *d,
+					INT_ITER_FUNC_ARG3 iter_func,
+					void **iter_data)
+{
+	int i = 0;
+	struct console *con = &d->console[0];
+
+	for (i = 0; i < MAX_CONSOLE; i++, con++)
+	{
+		if (iter_func(con, d, iter_data))
+			return 1;
+	}
+	return 0;
+}
+
 static int write_all(int fd, const char* buf, size_t len)
 {
 	while (len) {
@@ -336,7 +429,7 @@ static int create_console_log(struct console *con)
 		return -1;
 	}
 
-	snprintf(logfile, PATH_MAX-1, "%s/guest-%s.log", log_dir, data);
+	snprintf(logfile, PATH_MAX-1, "%s/guest-%s%s.log", log_dir, data, con->log_suffix);
 	free(data);
 	logfile[PATH_MAX-1] = '\0';
 
@@ -488,7 +581,7 @@ static int console_create_tty(struct console *con)
 	}
 	free(path);
 
-	success = (asprintf(&path, "%s/tty", con->xspath) != -1);
+	success = (asprintf(&path, "%s/%s", con->xspath, con->ttyname) != -1);
 	if (!success)
 		goto out;
 	success = xs_write(xs, XBT_NULL, path, slave, strlen(slave));
@@ -654,13 +747,13 @@ static bool watch_domain(struct domain *dom, bool watch)
 {
 	char domid_str[3 + MAX_STRLEN(dom->domid)];
 	bool success;
-	struct console *con = &dom->console;
+	struct console *con = &dom->console[0];
 
 	snprintf(domid_str, sizeof(domid_str), "dom%u", dom->domid);
 	if (watch) {
 		success = xs_watch(xs, con->xspath, domid_str);
 		if (success)
-			console_create_ring(con);
+			console_iter_int_arg1(dom, console_create_ring);
 		else
 			xs_unwatch(xs, con->xspath, domid_str);
 	} else {
@@ -670,15 +763,18 @@ static bool watch_domain(struct domain *dom, bool watch)
 	return success;
 }
 
-static int console_init(struct console *con, struct domain *dom)
+static int console_init(struct console *con, struct domain *dom, void **data)
 {
 	char *s;
+	int err = -1;
 	struct timespec ts;
+	struct console_data **con_data = (struct console_data **)data;
+	char *xsname, *xspath;
 
 	if (clock_gettime(CLOCK_MONOTONIC, &ts) < 0) {
 		dolog(LOG_ERR, "Cannot get time of day %s:%s:L%d",
 		      __FILE__, __FUNCTION__, __LINE__);
-		return NULL;
+		return err;
 	}
 
 	con->master_fd = -1;
@@ -691,30 +787,37 @@ static int console_init(struct console *con, struct domain *dom)
 	con->xce_pollfd_idx = -1;
 	con->next_period = ((long long)ts.tv_sec * 1000) + (ts.tv_nsec / 1000000) + RATE_LIMIT_PERIOD;
 	con->d = dom;
-	con->xspath = xs_get_domain_path(xs, dom->domid);
-	s = realloc(con->xspath, strlen(con->xspath) +
-		    strlen("/console") + 1);
+	*(char **)&con->ttyname = (char *)(*con_data)->ttyname;
+	*(char **)&con->log_suffix = (char *)(*con_data)->log_suffix;
+	con->optional = (*con_data)->optional;
+	con->prefer_gnttab = (*con_data)->prefer_gnttab;
+	xsname = (char *)(*con_data)->xsname;
+	xspath = xs_get_domain_path(xs, dom->domid);
+	s = realloc(xspath, strlen(xspath) +
+		    strlen(xsname) + 1);
 	if (s)
 	{
-		con->xspath = s;
-		strcat(con->xspath, "/console");
+		xspath = s;
+		strcat(xspath, xsname);
+		*(char **)&con->xspath = xspath;
 		err = 0;
 	}
 
+	(*con_data)++;
+
 	return err;
 }
 
 static void console_free(struct console *con)
 {
 	if (con->xspath)
-		free(con->xspath);
+		free((char *)con->xspath);
 }
 
 static struct domain *create_domain(int domid)
 {
 	struct domain *dom;
-	char *s;
-	struct console *con;
+	struct console_data *con_data = &console_data[0];
 
 	dom = calloc(1, sizeof *dom);
 	if (dom == NULL) {
@@ -724,9 +827,8 @@ static struct domain *create_domain(int domid)
 	}
 
 	dom->domid = domid;
-	con = &dom->console;
 
-	if (console_init(con, dom))
+	if (console_iter_int_arg3(dom, console_init, (void **)&con_data))
 		goto out;
 
 	if (!watch_domain(dom, true))
@@ -739,7 +841,7 @@ static struct domain *create_domain(int domid)
 
 	return dom;
  out:
-	console_free(con);
+	console_iter_void_arg1(dom, console_free);
 	free(dom);
 	return NULL;
 }
@@ -784,18 +886,16 @@ static void console_cleanup(struct console *con)
 
 	if (con->xspath)
 	{
-		free(con->xspath);
-		con->xspath = NULL;
+		free((char *)con->xspath);
+		*(char **)&con->xspath = (char *)NULL;
 	}
 }
 
 static void cleanup_domain(struct domain *d)
 {
-	struct console *con = &d->console;
-
-	console_close_tty(con);
+	console_iter_void_arg1(d, console_close_tty);
 
-	console_cleanup(con);
+	console_iter_void_arg1(d, console_cleanup);
 
 	remove_domain(d);
 }
@@ -810,12 +910,10 @@ static void console_close_evtchn(struct console *con)
 
 static void shutdown_domain(struct domain *d)
 {
-	struct console *con = &d->console;
-
 	d->is_dead = true;
 	watch_domain(d, false);
-	console_unmap_interface(con);
-	console_close_evtchn(con);
+	console_iter_void_arg1(d, console_unmap_interface);
+	console_iter_void_arg1(d, console_close_evtchn);
 }
 
 static unsigned enum_pass = 0;
@@ -1011,7 +1109,7 @@ static void handle_xs(void)
 		/* We may get watches firing for domains that have recently
 		   been removed, so dom may be NULL here. */
 		if (dom && dom->is_dead == false)
-			console_create_ring(&dom->console);
+			console_iter_int_arg1(dom, console_create_ring);
 	}
 
 	free(vec);
@@ -1067,9 +1165,7 @@ static void handle_log_reload(void)
 	if (log_guest) {
 		struct domain *d;
 		for (d = dom_head; d; d = d->next) {
-			struct console *con = &d->console;
-
-			console_open_log(con);
+			console_iter_void_arg1(d, console_open_log);
 		}
 	}
 
@@ -1233,13 +1329,12 @@ void handle_io(void)
 		/* Re-calculate any event counter allowances & unblock
 		   domains with new allowance */
 		for (d = dom_head; d; d = d->next) {
-			struct console *con = &d->console;
 
-			console_evtchn_unmask(con, (void *)now);
+			console_iter_void_arg2(d, console_evtchn_unmask, (void *)now);
 
-			add_console_evtchn_fd(con, (void *)&next_timeout);
+			console_iter_void_arg2(d, add_console_evtchn_fd, (void *)&next_timeout);
 
-			add_console_tty_fd(con);
+			console_iter_void_arg1(d, add_console_tty_fd);
 		}
 
 		/* If any domain has been rate limited, we need to work
@@ -1300,13 +1395,12 @@ void handle_io(void)
 		}
 
 		for (d = dom_head; d; d = n) {
-			struct console *con = &d->console;
 
 			n = d->next;
 
-			handle_console_ring(con);
+			console_iter_void_arg1(d, handle_console_ring);
 
-			handle_console_tty(con);
+			console_iter_void_arg1(d, handle_console_tty);
 
 			if (d->last_seen != enum_pass)
 				shutdown_domain(d);
-- 
2.7.4


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