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Message-Id: <20241001173109.1513-10-alexandru.gagniuc@hp.com>
Date: Tue, 1 Oct 2024 17:31:04 +0000
From: Alexandru Gagniuc <alexandru.gagniuc@...com>
To: gregkh@...uxfoundation.org,
stable@...r.kernel.org
Cc: qin.wan@...com,
andreas.noever@...il.com,
michael.jamet@...el.com,
mika.westerberg@...ux.intel.com,
YehezkelShB@...il.com,
linux-usb@...r.kernel.org,
linux-kernel@...r.kernel.org,
Gil Fine <gil.fine@...ux.intel.com>,
Alexandru Gagniuc <alexandru.gagniuc@...com>
Subject: [PATCH 6.6 09/14] thunderbolt: Introduce tb_port_path_direction_downstream()
From: Gil Fine <gil.fine@...ux.intel.com>
[ Upstream commit 2bfeca73e94567c1a117ca45d2e8a25d63e5bd2c ]
Introduce tb_port_path_direction_downstream() to check if path from
source adapter to destination adapter is directed towards downstream.
Convert existing users to call this helper instead of open-coding.
No functional changes.
Signed-off-by: Gil Fine <gil.fine@...ux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
Signed-off-by: Qin Wan <qin.wan@...com>
Signed-off-by: Alexandru Gagniuc <alexandru.gagniuc@...com>
---
drivers/thunderbolt/tb.c | 6 +++---
drivers/thunderbolt/tb.h | 15 +++++++++++++++
drivers/thunderbolt/tunnel.c | 14 +++++++-------
3 files changed, 25 insertions(+), 10 deletions(-)
diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c
index 183225bdbbf5..4ea0536ec5cf 100644
--- a/drivers/thunderbolt/tb.c
+++ b/drivers/thunderbolt/tb.c
@@ -553,7 +553,7 @@ static struct tb_tunnel *tb_find_first_usb3_tunnel(struct tb *tb,
struct tb_switch *sw;
/* Pick the router that is deepest in the topology */
- if (dst_port->sw->config.depth > src_port->sw->config.depth)
+ if (tb_port_path_direction_downstream(src_port, dst_port))
sw = dst_port->sw;
else
sw = src_port->sw;
@@ -1223,7 +1223,7 @@ tb_recalc_estimated_bandwidth_for_group(struct tb_bandwidth_group *group)
tb_port_dbg(in, "re-calculated estimated bandwidth %u/%u Mb/s\n",
estimated_up, estimated_down);
- if (in->sw->config.depth < out->sw->config.depth)
+ if (tb_port_path_direction_downstream(in, out))
estimated_bw = estimated_down;
else
estimated_bw = estimated_up;
@@ -2002,7 +2002,7 @@ static void tb_handle_dp_bandwidth_request(struct work_struct *work)
out = tunnel->dst_port;
- if (in->sw->config.depth < out->sw->config.depth) {
+ if (tb_port_path_direction_downstream(in, out)) {
requested_up = -1;
requested_down = requested_bw;
} else {
diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h
index 2f5f85666302..6d66dd2a3ab0 100644
--- a/drivers/thunderbolt/tb.h
+++ b/drivers/thunderbolt/tb.h
@@ -1044,6 +1044,21 @@ void tb_port_release_out_hopid(struct tb_port *port, int hopid);
struct tb_port *tb_next_port_on_path(struct tb_port *start, struct tb_port *end,
struct tb_port *prev);
+/**
+ * tb_port_path_direction_downstream() - Checks if path directed downstream
+ * @src: Source adapter
+ * @dst: Destination adapter
+ *
+ * Returns %true only if the specified path from source adapter (@src)
+ * to destination adapter (@dst) is directed downstream.
+ */
+static inline bool
+tb_port_path_direction_downstream(const struct tb_port *src,
+ const struct tb_port *dst)
+{
+ return src->sw->config.depth < dst->sw->config.depth;
+}
+
static inline bool tb_port_use_credit_allocation(const struct tb_port *port)
{
return tb_port_is_null(port) && port->sw->credit_allocation;
diff --git a/drivers/thunderbolt/tunnel.c b/drivers/thunderbolt/tunnel.c
index e296ab5d657b..8aec678d80d3 100644
--- a/drivers/thunderbolt/tunnel.c
+++ b/drivers/thunderbolt/tunnel.c
@@ -677,7 +677,7 @@ static int tb_dp_xchg_caps(struct tb_tunnel *tunnel)
"DP OUT maximum supported bandwidth %u Mb/s x%u = %u Mb/s\n",
out_rate, out_lanes, bw);
- if (in->sw->config.depth < out->sw->config.depth)
+ if (tb_port_path_direction_downstream(in, out))
max_bw = tunnel->max_down;
else
max_bw = tunnel->max_up;
@@ -802,7 +802,7 @@ static int tb_dp_bandwidth_alloc_mode_enable(struct tb_tunnel *tunnel)
* max_up/down fields. For discovery we just read what the
* estimation was set to.
*/
- if (in->sw->config.depth < out->sw->config.depth)
+ if (tb_port_path_direction_downstream(in, out))
estimated_bw = tunnel->max_down;
else
estimated_bw = tunnel->max_up;
@@ -972,7 +972,7 @@ static int tb_dp_bandwidth_mode_consumed_bandwidth(struct tb_tunnel *tunnel,
if (allocated_bw == max_bw)
allocated_bw = ret;
- if (in->sw->config.depth < out->sw->config.depth) {
+ if (tb_port_path_direction_downstream(in, out)) {
*consumed_up = 0;
*consumed_down = allocated_bw;
} else {
@@ -1007,7 +1007,7 @@ static int tb_dp_allocated_bandwidth(struct tb_tunnel *tunnel, int *allocated_up
if (allocated_bw == max_bw)
allocated_bw = ret;
- if (in->sw->config.depth < out->sw->config.depth) {
+ if (tb_port_path_direction_downstream(in, out)) {
*allocated_up = 0;
*allocated_down = allocated_bw;
} else {
@@ -1035,7 +1035,7 @@ static int tb_dp_alloc_bandwidth(struct tb_tunnel *tunnel, int *alloc_up,
if (ret < 0)
return ret;
- if (in->sw->config.depth < out->sw->config.depth) {
+ if (tb_port_path_direction_downstream(in, out)) {
tmp = min(*alloc_down, max_bw);
ret = usb4_dp_port_allocate_bandwidth(in, tmp);
if (ret)
@@ -1133,7 +1133,7 @@ static int tb_dp_maximum_bandwidth(struct tb_tunnel *tunnel, int *max_up,
if (ret < 0)
return ret;
- if (in->sw->config.depth < tunnel->dst_port->sw->config.depth) {
+ if (tb_port_path_direction_downstream(in, tunnel->dst_port)) {
*max_up = 0;
*max_down = ret;
} else {
@@ -1191,7 +1191,7 @@ static int tb_dp_consumed_bandwidth(struct tb_tunnel *tunnel, int *consumed_up,
return 0;
}
- if (in->sw->config.depth < tunnel->dst_port->sw->config.depth) {
+ if (tb_port_path_direction_downstream(in, tunnel->dst_port)) {
*consumed_up = 0;
*consumed_down = tb_dp_bandwidth(rate, lanes);
} else {
--
2.45.1
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