[PATCH v2 12/18] thunderbolt: Add tb_xdomain_find_by_route()

Mika Westerberg
2018-02-26T14:15:13Z

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

This is needed by the new ICM interface to find xdomains by route string
instead of link and depth.

While there update existing tb_xdomain_find_* functions to use
tb_xdomain_get() instead of open-coding the same.

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/xdomain.c | 47 ++++++++++++++++++++++++++++++++-----------
include/linux/thunderbolt.h | 13 ++++++++++++
2 files changed, 48 insertions(+), 12 deletions(-)

diff --git a/drivers/thunderbolt/xdomain.c b/drivers/thunderbolt/xdomain.c
index f25d88d4552b..8abb4e843085 100644
--- a/drivers/thunderbolt/xdomain.c
+++ b/drivers/thunderbolt/xdomain.c
@@ -1255,6 +1255,7 @@ struct tb_xdomain_lookup {
const uuid_t *uuid;
u8 link;
u8 depth;
+ u64 route;
};

static struct tb_xdomain *switch_find_xdomain(struct tb_switch *sw,
@@ -1275,9 +1276,13 @@ static struct tb_xdomain *switch_find_xdomain(struct tb_switch *sw,
if (lookup->uuid) {
if (uuid_equal(xd->remote_uuid, lookup->uuid))
return xd;
- } else if (lookup->link == xd->link &&
+ } else if (lookup->link &&
+ lookup->link == xd->link &&
lookup->depth == xd->depth) {
return xd;
+ } else if (lookup->route &&
+ lookup->route == xd->route) {
+ return xd;
}
} else if (port->remote) {
xd = switch_find_xdomain(port->remote->sw, lookup);
@@ -1313,12 +1318,7 @@ struct tb_xdomain *tb_xdomain_find_by_uuid(struct tb *tb, const uuid_t *uuid)
lookup.uuid = uuid;

xd = switch_find_xdomain(tb->root_switch, &lookup);
- if (xd) {
- get_device(&xd->dev);
- return xd;
- }
-
- return NULL;
+ return tb_xdomain_get(xd);
}
EXPORT_SYMBOL_GPL(tb_xdomain_find_by_uuid);

@@ -1349,13 +1349,36 @@ struct tb_xdomain *tb_xdomain_find_by_link_depth(struct tb *tb, u8 link,
lookup.depth = depth;

xd = switch_find_xdomain(tb->root_switch, &lookup);
- if (xd) {
- get_device(&xd->dev);
- return xd;
- }
+ return tb_xdomain_get(xd);
+}

- return NULL;
+/**
+ * tb_xdomain_find_by_route() - Find an XDomain by route string
+ * @tb: Domain where the XDomain belongs to
+ * @route: XDomain route string
+ *
+ * Finds XDomain by walking through the Thunderbolt topology below @tb.
+ * The returned XDomain will have its reference count increased so the
+ * caller needs to call tb_xdomain_put() when it is done with the
+ * object.
+ *
+ * This will find all XDomains including the ones that are not yet added
+ * to the bus (handshake is still in progress).
+ *
+ * The caller needs to hold @tb->lock.
+ */
+struct tb_xdomain *tb_xdomain_find_by_route(struct tb *tb, u64 route)
+{
+ struct tb_xdomain_lookup lookup;
+ struct tb_xdomain *xd;
+
+ memset(&lookup, 0, sizeof(lookup));
+ lookup.route = route;
+
+ xd = switch_find_xdomain(tb->root_switch, &lookup);
+ return tb_xdomain_get(xd);
}
+EXPORT_SYMBOL_GPL(tb_xdomain_find_by_route);

bool tb_xdomain_handle_request(struct tb *tb, enum tb_cfg_pkg_type type,
const void *buf, size_t size)
diff --git a/include/linux/thunderbolt.h b/include/linux/thunderbolt.h
index 7b69853188b1..27b9be34d4b9 100644
--- a/include/linux/thunderbolt.h
+++ b/include/linux/thunderbolt.h
@@ -237,6 +237,7 @@ int tb_xdomain_enable_paths(struct tb_xdomain *xd, u16 transmit_path,
u16 receive_ring);
int tb_xdomain_disable_paths(struct tb_xdomain *xd);
struct tb_xdomain *tb_xdomain_find_by_uuid(struct tb *tb, const uuid_t *uuid);
+struct tb_xdomain *tb_xdomain_find_by_route(struct tb *tb, u64 route);

static inline struct tb_xdomain *
tb_xdomain_find_by_uuid_locked(struct tb *tb, const uuid_t *uuid)
@@ -250,6 +251,18 @@ tb_xdomain_find_by_uuid_locked(struct tb *tb, const uuid_t *uuid)
return xd;
}

+static inline struct tb_xdomain *
+tb_xdomain_find_by_route_locked(struct tb *tb, u64 route)
+{
+ struct tb_xdomain *xd;
+
+ mutex_lock(&tb->lock);
+ xd = tb_xdomain_find_by_route(tb, route);
+ mutex_unlock(&tb->lock);
+
+ return xd;
+}
+
static inline struct tb_xdomain *tb_xdomain_get(struct tb_xdomain *xd)
{
if (xd)
--
2.16.1