[PATCH v2 11/18] thunderbolt: Add tb_switch_find_by_route()

Mika Westerberg
2018-02-26T14:13:11Z

From: Radion Mirchevsky <radion.mirchevsky@intel.com>

With the new ICM messaging there is need for find switch by route string
instead of link and depth. Add new function that makes it possible.

Signed-off-by: Radion Mirchevsky <radion.mirchevsky@intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
---
drivers/thunderbolt/switch.c | 33 +++++++++++++++++++++++++++++++++
drivers/thunderbolt/tb.h | 1 +
2 files changed, 34 insertions(+)

diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c
index 2a0bded44922..4e2b2097bbfc 100644
--- a/drivers/thunderbolt/switch.c
+++ b/drivers/thunderbolt/switch.c
@@ -1479,6 +1479,7 @@ struct tb_sw_lookup {
u8 link;
u8 depth;
const uuid_t *uuid;
+ u64 route;
};

static int tb_switch_match(struct device *dev, void *data)
@@ -1494,6 +1495,11 @@ static int tb_switch_match(struct device *dev, void *data)
if (lookup->uuid)
return !memcmp(sw->uuid, lookup->uuid, sizeof(*lookup->uuid));

+ if (lookup->route) {
+ return sw->config.route_lo == lower_32_bits(lookup->route) &&
+ sw->config.route_hi == upper_32_bits(lookup->route);
+ }
+
/* Root switch is matched only by depth */
if (!lookup->depth)
return !sw->depth;
@@ -1551,6 +1557,33 @@ struct tb_switch *tb_switch_find_by_uuid(struct tb *tb, const uuid_t *uuid)
return NULL;
}

+/**
+ * tb_switch_find_by_route() - Find switch by route string
+ * @tb: Domain the switch belongs
+ * @route: Route string to look for
+ *
+ * Returned switch has reference count increased so the caller needs to
+ * call tb_switch_put() when done with the switch.
+ */
+struct tb_switch *tb_switch_find_by_route(struct tb *tb, u64 route)
+{
+ struct tb_sw_lookup lookup;
+ struct device *dev;
+
+ if (!route)
+ return tb_switch_get(tb->root_switch);
+
+ memset(&lookup, 0, sizeof(lookup));
+ lookup.tb = tb;
+ lookup.route = route;
+
+ dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
+ if (dev)
+ return tb_to_switch(dev);
+
+ return NULL;
+}
+
void tb_switch_exit(void)
{
ida_destroy(&nvm_ida);
diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h
index c7bd77e9c2c3..2cd6085a6e10 100644
--- a/drivers/thunderbolt/tb.h
+++ b/drivers/thunderbolt/tb.h
@@ -386,6 +386,7 @@ struct tb_switch *get_switch_at_route(struct tb_switch *sw, u64 route);
struct tb_switch *tb_switch_find_by_link_depth(struct tb *tb, u8 link,
u8 depth);
struct tb_switch *tb_switch_find_by_uuid(struct tb *tb, const uuid_t *uuid);
+struct tb_switch *tb_switch_find_by_route(struct tb *tb, u64 route);

static inline struct tb_switch *tb_switch_get(struct tb_switch *sw)
{
--
2.16.1