From 5cc0df9ce10a860aaeac53f8df1cc8754c5c7b03 Mon Sep 17 00:00:00 2001 From: Isaac Hazan Date: Thu, 24 Sep 2020 11:44:01 +0300 Subject: [PATCH] thunderbolt: Add functions for enabling and disabling lane bonding on XDomain These can be used by service drivers to enable and disable lane bonding as needed. Signed-off-by: Isaac Hazan Signed-off-by: Mika Westerberg Acked-by: Yehezkel Bernat Reviewed-by: Greg Kroah-Hartman --- drivers/thunderbolt/switch.c | 24 ++++++++++++++-- drivers/thunderbolt/tb.h | 3 ++ drivers/thunderbolt/xdomain.c | 66 +++++++++++++++++++++++++++++++++++++++++++ include/linux/thunderbolt.h | 2 ++ 4 files changed, 92 insertions(+), 3 deletions(-) diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c index 05a3609..cdfd8cc 100644 --- a/drivers/thunderbolt/switch.c +++ b/drivers/thunderbolt/switch.c @@ -503,12 +503,13 @@ static void tb_dump_port(struct tb *tb, struct tb_regs_port_header *port) /** * tb_port_state() - get connectedness state of a port + * @port: the port to check * * The port must have a TB_CAP_PHY (i.e. it should be a real port). * * Return: Returns an enum tb_port_state on success or an error code on failure. */ -static int tb_port_state(struct tb_port *port) +int tb_port_state(struct tb_port *port) { struct tb_cap_phy phy; int res; @@ -1008,7 +1009,16 @@ static int tb_port_set_link_width(struct tb_port *port, unsigned int width) port->cap_phy + LANE_ADP_CS_1, 1); } -static int tb_port_lane_bonding_enable(struct tb_port *port) +/** + * tb_port_lane_bonding_enable() - Enable bonding on port + * @port: port to enable + * + * Enable bonding by setting the link width of the port and the + * other port in case of dual link port. + * + * Return: %0 in case of success and negative errno in case of error + */ +int tb_port_lane_bonding_enable(struct tb_port *port) { int ret; @@ -1038,7 +1048,15 @@ static int tb_port_lane_bonding_enable(struct tb_port *port) return 0; } -static void tb_port_lane_bonding_disable(struct tb_port *port) +/** + * tb_port_lane_bonding_disable() - Disable bonding on port + * @port: port to disable + * + * Disable bonding by setting the link width of the port and the + * other port in case of dual link port. + * + */ +void tb_port_lane_bonding_disable(struct tb_port *port) { port->dual_link_port->bonded = false; port->bonded = false; diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h index 3a82631..e98d356 100644 --- a/drivers/thunderbolt/tb.h +++ b/drivers/thunderbolt/tb.h @@ -863,6 +863,9 @@ struct tb_port *tb_next_port_on_path(struct tb_port *start, struct tb_port *end, int tb_port_get_link_speed(struct tb_port *port); int tb_port_get_link_width(struct tb_port *port); +int tb_port_state(struct tb_port *port); +int tb_port_lane_bonding_enable(struct tb_port *port); +void tb_port_lane_bonding_disable(struct tb_port *port); int tb_switch_find_vse_cap(struct tb_switch *sw, enum tb_switch_vse_cap vsec); int tb_switch_find_cap(struct tb_switch *sw, enum tb_switch_cap cap); diff --git a/drivers/thunderbolt/xdomain.c b/drivers/thunderbolt/xdomain.c index 83a315f..6510821 100644 --- a/drivers/thunderbolt/xdomain.c +++ b/drivers/thunderbolt/xdomain.c @@ -8,6 +8,7 @@ */ #include +#include #include #include #include @@ -21,6 +22,7 @@ #define XDOMAIN_UUID_RETRIES 10 #define XDOMAIN_PROPERTIES_RETRIES 60 #define XDOMAIN_PROPERTIES_CHANGED_RETRIES 10 +#define XDOMAIN_BONDING_WAIT 100 /* ms */ struct xdomain_request_work { struct work_struct work; @@ -1444,6 +1446,70 @@ void tb_xdomain_remove(struct tb_xdomain *xd) } /** + * tb_xdomain_lane_bonding_enable() - Enable lane bonding on XDomain + * @xd: XDomain connection + * + * Lane bonding is disabled by default for XDomains. This function tries + * to enable bonding by first enabling the port and waiting for the CL0 + * state. + * + * Return: %0 in case of success and negative errno in case of error. + */ +int tb_xdomain_lane_bonding_enable(struct tb_xdomain *xd) +{ + struct tb_port *port; + int ret; + + port = tb_port_at(xd->route, tb_xdomain_parent(xd)); + if (!port->dual_link_port) + return -ENODEV; + + ret = tb_port_enable(port->dual_link_port); + if (ret) + return ret; + + ret = tb_wait_for_port(port->dual_link_port, true); + if (ret < 0) + return ret; + if (!ret) + return -ENOTCONN; + + ret = tb_port_lane_bonding_enable(port); + if (ret) { + tb_port_warn(port, "failed to enable lane bonding\n"); + return ret; + } + + tb_xdomain_update_link_attributes(xd); + + dev_dbg(&xd->dev, "lane bonding enabled\n"); + return 0; +} +EXPORT_SYMBOL_GPL(tb_xdomain_lane_bonding_enable); + +/** + * tb_xdomain_lane_bonding_disable() - Disable lane bonding + * @xd: XDomain connection + * + * Lane bonding is disabled by default for XDomains. If bonding has been + * enabled, this function can be used to disable it. + */ +void tb_xdomain_lane_bonding_disable(struct tb_xdomain *xd) +{ + struct tb_port *port; + + port = tb_port_at(xd->route, tb_xdomain_parent(xd)); + if (port->dual_link_port) { + tb_port_lane_bonding_disable(port); + tb_port_disable(port->dual_link_port); + tb_xdomain_update_link_attributes(xd); + + dev_dbg(&xd->dev, "lane bonding disabled\n"); + } +} +EXPORT_SYMBOL_GPL(tb_xdomain_lane_bonding_disable); + +/** * tb_xdomain_enable_paths() - Enable DMA paths for XDomain connection * @xd: XDomain connection * @transmit_path: HopID of the transmit path the other end is using to diff --git a/include/linux/thunderbolt.h b/include/linux/thunderbolt.h index e441af8..0a747f9 100644 --- a/include/linux/thunderbolt.h +++ b/include/linux/thunderbolt.h @@ -247,6 +247,8 @@ struct tb_xdomain { u8 depth; }; +int tb_xdomain_lane_bonding_enable(struct tb_xdomain *xd); +void tb_xdomain_lane_bonding_disable(struct tb_xdomain *xd); int tb_xdomain_enable_paths(struct tb_xdomain *xd, u16 transmit_path, u16 transmit_ring, u16 receive_path, u16 receive_ring); -- 2.7.4