[PATCH 09/28] thunderbolt: Cache adapter specific capability offset into struct port

Mika Westerberg
2019-01-29T15:05:47Z

The adapter specific capability either is there or not if the port does
not hold an adapter. Instead of always finding it on-demand we read the
offset just once when the port is initialized.

While there we update the struct port documentation to follow kernel-doc
format.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
---
drivers/thunderbolt/switch.c | 4 ++++
drivers/thunderbolt/tb.c | 4 ++--
drivers/thunderbolt/tb.h | 3 +++
drivers/thunderbolt/tunnel_pci.c | 9 +++------
4 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c
index 1eee2502b5ba..fcafe4095de5 100644
--- a/drivers/thunderbolt/switch.c
+++ b/drivers/thunderbolt/switch.c
@@ -585,6 +585,8 @@ static int tb_init_port(struct tb_port *port)
if (res)
return res;

+ port->cap_adap = -ENOENT;
+
/* Port 0 is the switch itself and has no PHY. */
if (port->config.type == TB_TYPE_PORT && port->port != 0) {
cap = tb_port_find_cap(port, TB_PORT_CAP_PHY);
@@ -593,6 +595,8 @@ static int tb_init_port(struct tb_port *port)
port->cap_phy = cap;
else
tb_port_WARN(port, "non switch port without a PHY\n");
+ } else if (port->port != 0) {
+ port->cap_adap = tb_port_find_cap(port, TB_PORT_CAP_ADAP);
}

tb_dump_port(port->sw->tb, &port->config);
diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c
index 30e02c716f6c..8e9761d950d6 100644
--- a/drivers/thunderbolt/tb.c
+++ b/drivers/thunderbolt/tb.c
@@ -151,7 +151,7 @@ static struct tb_port *tb_find_unused_down_port(struct tb_switch *sw)
continue;
if (sw->ports[i].config.type != TB_TYPE_PCIE_DOWN)
continue;
- cap = tb_port_find_cap(&sw->ports[i], TB_PORT_CAP_ADAP);
+ cap = sw->ports[i].cap_adap;
if (cap < 0)
continue;
res = tb_port_read(&sw->ports[i], &data, TB_CFG_PORT, cap, 1);
@@ -197,7 +197,7 @@ static void tb_activate_pcie_devices(struct tb *tb)
}

/* check whether port is already activated */
- cap = tb_port_find_cap(up_port, TB_PORT_CAP_ADAP);
+ cap = up_port->cap_adap;
if (cap < 0)
continue;
if (tb_port_read(up_port, &data, TB_CFG_PORT, cap, 1))
diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h
index 3160169389cc..43a1d7dfba73 100644
--- a/drivers/thunderbolt/tb.h
+++ b/drivers/thunderbolt/tb.h
@@ -124,6 +124,8 @@ struct tb_switch {
* @remote: Remote port (%NULL if not connected)
* @xdomain: Remote host (%NULL if not connected)
* @cap_phy: Offset, zero if not found
+ * @cap_adap: Offset of the adapter specific capability. Negative if not
+ * present.
* @port: Port number on switch
* @disabled: Disabled by eeprom
* @dual_link_port: If the switch is connected using two ports, points
@@ -136,6 +138,7 @@ struct tb_port {
struct tb_port *remote;
struct tb_xdomain *xdomain;
int cap_phy;
+ int cap_adap;
u8 port;
bool disabled;
struct tb_port *dual_link_port;
diff --git a/drivers/thunderbolt/tunnel_pci.c b/drivers/thunderbolt/tunnel_pci.c
index 0637537ea53f..4fae236a4a39 100644
--- a/drivers/thunderbolt/tunnel_pci.c
+++ b/drivers/thunderbolt/tunnel_pci.c
@@ -148,12 +148,9 @@ bool tb_pci_is_invalid(struct tb_pci_tunnel *tunnel)
static int tb_pci_port_active(struct tb_port *port, bool active)
{
u32 word = active ? 0x80000000 : 0x0;
- int cap = tb_port_find_cap(port, TB_PORT_CAP_ADAP);
- if (cap < 0) {
- tb_port_warn(port, "TB_PORT_CAP_ADAP not found: %d\n", cap);
- return cap;
- }
- return tb_port_write(port, &word, TB_CFG_PORT, cap, 1);
+ if (port->cap_adap < 0)
+ return -ENXIO;
+ return tb_port_write(port, &word, TB_CFG_PORT, port->cap_adap, 1);
}

/**
--
2.20.1