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Date: Fri, 29 Nov 2013 02:35:46 +0100
From: Andreas Noever <andreas.noever@...il.com>
To: linux-kernel@...r.kernel.org
Cc: Andreas Noever <andreas.noever@...il.com>
Subject: [PATCH 09/12] thunderbolt: Handle hotplug events
We reveive a plug event callback whenever a thunderbolt device is added
or removed. This patch fills in the tb_handle_hotplug method and starts
reacting to these events by adding/removing switches from the hierarchy.
Signed-off-by: Andreas Noever <andreas.noever@...il.com>
---
drivers/thunderbolt/tb.c | 83 +++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 82 insertions(+), 1 deletion(-)
diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c
index 9daff7b..d9bce38 100644
--- a/drivers/thunderbolt/tb.c
+++ b/drivers/thunderbolt/tb.c
@@ -108,6 +108,22 @@ static int tb_route_length(u64 route)
return (fls64(route) + TB_ROUTE_SHIFT - 1) / TB_ROUTE_SHIFT;
}
+static struct tb_switch *get_switch_at_route(struct tb_switch *sw, u64 route)
+{
+ u8 next_port = route & TB_PORT_MASK;
+ if (route == 0)
+ return sw;
+ if (next_port > sw->config.max_port_number)
+ return 0;
+ if (tb_is_upstream_port(&sw->ports[next_port]))
+ return 0;
+ if (!sw->ports[next_port].remote)
+ return 0;
+ return get_switch_at_route(sw->ports[next_port].remote->sw,
+ route >> TB_ROUTE_SHIFT);
+}
+
+
/* thunderbolt capability lookup */
@@ -527,6 +543,27 @@ static void tb_scan_port(struct tb_port *port)
tb_scan_ports(sw);
}
+/**
+ * tb_invalidate_below() - recursively invalidate all ports below a given port
+ */
+static void tb_invalidate_below(struct tb_port *port)
+{
+ struct tb_switch *sw;
+ int i;
+ if (tb_is_upstream_port(port)) {
+ tb_port_WARN(port, "trying to invalidate an upstream port.\n");
+ return;
+ }
+ if (!port->remote)
+ return;
+ sw = port->remote->sw;
+ for (i = 0; i <= sw->config.max_port_number; i++) {
+ sw->ports[i].invalid = true;
+ if (!tb_is_upstream_port(&sw->ports[i]))
+ tb_invalidate_below(&sw->ports[i]);
+ }
+}
+
struct tb_hotplug_event {
struct work_struct work;
struct tb *tb;
@@ -544,10 +581,54 @@ static void tb_handle_hotplug(struct work_struct *work)
{
struct tb_hotplug_event *ev = container_of(work, typeof(*ev), work);
struct tb *tb = ev->tb;
+ struct tb_switch *sw;
+ struct tb_port *port;
mutex_lock(&tb->lock);
if (tb->shutdown)
goto out;
- /* do nothing for now */
+
+ sw = get_switch_at_route(tb->root_switch, ev->route);
+ if (!sw) {
+ tb_WARN(tb,
+ "hotplug event for non existent switch %llx:%x (unplug: %d)\n",
+ ev->route,
+ ev->port,
+ ev->unplug)
+ goto out;
+ }
+ if (sw->config.max_port_number < ev->port) {
+ tb_WARN(tb,
+ "hotplug event for non existent port %llx:%x (unplug: %d)\n",
+ ev->route,
+ ev->port,
+ ev->unplug)
+ goto out;
+ }
+ port = &sw->ports[ev->port];
+ if (tb_is_upstream_port(port)) {
+ tb_WARN(tb,
+ "hotplug event for upstream port %llx:%x (unplug: %d)\n",
+ ev->route,
+ ev->port,
+ ev->unplug)
+ goto out;
+ }
+ if (ev->unplug) {
+ if (port->remote) {
+ tb_port_info(port, "unplugged\n");
+ tb_invalidate_below(port);
+ tb_switch_free(port->remote->sw);
+ port->remote = NULL;
+ } else {
+ tb_port_info(port,
+ "got unplug event for disconnected port\n");
+ }
+ } else {
+ tb_port_info(port, "hotplug: scanning\n");
+ tb_scan_port(port);
+ if (!port->remote)
+ tb_port_info(port, "hotplug: no switch found\n");
+ }
out:
mutex_unlock(&tb->lock);
kfree(ev);
--
1.8.4.2
--
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