diff options
Diffstat (limited to 'drivers/thunderbolt/tb.c')
| -rw-r--r-- | drivers/thunderbolt/tb.c | 774 |
1 files changed, 618 insertions, 156 deletions
diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c index 27bd6ca6f99e..5acdeb766860 100644 --- a/drivers/thunderbolt/tb.c +++ b/drivers/thunderbolt/tb.c @@ -16,8 +16,31 @@ #include "tb_regs.h" #include "tunnel.h" -#define TB_TIMEOUT 100 /* ms */ -#define MAX_GROUPS 7 /* max Group_ID is 7 */ +#define TB_TIMEOUT 100 /* ms */ + +/* + * Minimum bandwidth (in Mb/s) that is needed in the single transmitter/receiver + * direction. This is 40G - 10% guard band bandwidth. + */ +#define TB_ASYM_MIN (40000 * 90 / 100) + +/* + * Threshold bandwidth (in Mb/s) that is used to switch the links to + * asymmetric and back. This is selected as 45G which means when the + * request is higher than this, we switch the link to asymmetric, and + * when it is less than this we switch it back. The 45G is selected so + * that we still have 27G (of the total 72G) for bulk PCIe traffic when + * switching back to symmetric. + */ +#define TB_ASYM_THRESHOLD 45000 + +#define MAX_GROUPS 7 /* max Group_ID is 7 */ + +static unsigned int asym_threshold = TB_ASYM_THRESHOLD; +module_param_named(asym_threshold, asym_threshold, uint, 0444); +MODULE_PARM_DESC(asym_threshold, + "threshold (Mb/s) when to Gen 4 switch link symmetry. 0 disables. (default: " + __MODULE_STRING(TB_ASYM_THRESHOLD) ")"); /** * struct tb_cm - Simple Thunderbolt connection manager @@ -190,7 +213,7 @@ static void tb_add_dp_resources(struct tb_switch *sw) if (!tb_switch_query_dp_resource(sw, port)) continue; - list_add_tail(&port->list, &tcm->dp_resources); + list_add(&port->list, &tcm->dp_resources); tb_port_dbg(port, "DP IN resource available\n"); } } @@ -255,13 +278,13 @@ static int tb_enable_clx(struct tb_switch *sw) * this in the future to cover the whole topology if it turns * out to be beneficial. */ - while (sw && sw->config.depth > 1) + while (sw && tb_switch_depth(sw) > 1) sw = tb_switch_parent(sw); if (!sw) return 0; - if (sw->config.depth != 1) + if (tb_switch_depth(sw) != 1) return 0; /* @@ -285,14 +308,32 @@ static int tb_enable_clx(struct tb_switch *sw) return ret == -EOPNOTSUPP ? 0 : ret; } -/* Disables CL states up to the host router */ -static void tb_disable_clx(struct tb_switch *sw) +/** + * tb_disable_clx() - Disable CL states up to host router + * @sw: Router to start + * + * Disables CL states from @sw up to the host router. Returns true if + * any CL state were disabled. This can be used to figure out whether + * the link was setup by us or the boot firmware so we don't + * accidentally enable them if they were not enabled during discovery. + */ +static bool tb_disable_clx(struct tb_switch *sw) { + bool disabled = false; + do { - if (tb_switch_clx_disable(sw) < 0) + int ret; + + ret = tb_switch_clx_disable(sw); + if (ret > 0) + disabled = true; + else if (ret < 0) tb_sw_warn(sw, "failed to disable CL states\n"); + sw = tb_switch_parent(sw); } while (sw); + + return disabled; } static int tb_increase_switch_tmu_accuracy(struct device *dev, void *data) @@ -553,7 +594,7 @@ 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; @@ -572,133 +613,294 @@ static struct tb_tunnel *tb_find_first_usb3_tunnel(struct tb *tb, return tb_find_tunnel(tb, TB_TUNNEL_USB3, usb3_down, NULL); } -static int tb_available_bandwidth(struct tb *tb, struct tb_port *src_port, - struct tb_port *dst_port, int *available_up, int *available_down) -{ - int usb3_consumed_up, usb3_consumed_down, ret; - struct tb_cm *tcm = tb_priv(tb); +/** + * tb_consumed_usb3_pcie_bandwidth() - Consumed USB3/PCIe bandwidth over a single link + * @tb: Domain structure + * @src_port: Source protocol adapter + * @dst_port: Destination protocol adapter + * @port: USB4 port the consumed bandwidth is calculated + * @consumed_up: Consumed upsream bandwidth (Mb/s) + * @consumed_down: Consumed downstream bandwidth (Mb/s) + * + * Calculates consumed USB3 and PCIe bandwidth at @port between path + * from @src_port to @dst_port. Does not take tunnel starting from + * @src_port and ending from @src_port into account. + */ +static int tb_consumed_usb3_pcie_bandwidth(struct tb *tb, + struct tb_port *src_port, + struct tb_port *dst_port, + struct tb_port *port, + int *consumed_up, + int *consumed_down) +{ + int pci_consumed_up, pci_consumed_down; struct tb_tunnel *tunnel; - struct tb_port *port; - tb_dbg(tb, "calculating available bandwidth between %llx:%u <-> %llx:%u\n", - tb_route(src_port->sw), src_port->port, tb_route(dst_port->sw), - dst_port->port); + *consumed_up = *consumed_down = 0; tunnel = tb_find_first_usb3_tunnel(tb, src_port, dst_port); if (tunnel && tunnel->src_port != src_port && tunnel->dst_port != dst_port) { - ret = tb_tunnel_consumed_bandwidth(tunnel, &usb3_consumed_up, - &usb3_consumed_down); + int ret; + + ret = tb_tunnel_consumed_bandwidth(tunnel, consumed_up, + consumed_down); if (ret) return ret; - } else { - usb3_consumed_up = 0; - usb3_consumed_down = 0; } - /* Maximum possible bandwidth asymmetric Gen 4 link is 120 Gb/s */ - *available_up = *available_down = 120000; + /* + * If there is anything reserved for PCIe bulk traffic take it + * into account here too. + */ + if (tb_tunnel_reserved_pci(port, &pci_consumed_up, &pci_consumed_down)) { + *consumed_up += pci_consumed_up; + *consumed_down += pci_consumed_down; + } - /* Find the minimum available bandwidth over all links */ - tb_for_each_port_on_path(src_port, dst_port, port) { - int link_speed, link_width, up_bw, down_bw; + return 0; +} - if (!tb_port_is_null(port)) +/** + * tb_consumed_dp_bandwidth() - Consumed DP bandwidth over a single link + * @tb: Domain structure + * @src_port: Source protocol adapter + * @dst_port: Destination protocol adapter + * @port: USB4 port the consumed bandwidth is calculated + * @consumed_up: Consumed upsream bandwidth (Mb/s) + * @consumed_down: Consumed downstream bandwidth (Mb/s) + * + * Calculates consumed DP bandwidth at @port between path from @src_port + * to @dst_port. Does not take tunnel starting from @src_port and ending + * from @src_port into account. + */ +static int tb_consumed_dp_bandwidth(struct tb *tb, + struct tb_port *src_port, + struct tb_port *dst_port, + struct tb_port *port, + int *consumed_up, + int *consumed_down) +{ + struct tb_cm *tcm = tb_priv(tb); + struct tb_tunnel *tunnel; + int ret; + + *consumed_up = *consumed_down = 0; + + /* + * Find all DP tunnels that cross the port and reduce + * their consumed bandwidth from the available. + */ + list_for_each_entry(tunnel, &tcm->tunnel_list, list) { + int dp_consumed_up, dp_consumed_down; + + if (tb_tunnel_is_invalid(tunnel)) continue; - if (tb_is_upstream_port(port)) { - link_speed = port->sw->link_speed; + if (!tb_tunnel_is_dp(tunnel)) + continue; + + if (!tb_tunnel_port_on_path(tunnel, port)) + continue; + + /* + * Ignore the DP tunnel between src_port and dst_port + * because it is the same tunnel and we may be + * re-calculating estimated bandwidth. + */ + if (tunnel->src_port == src_port && + tunnel->dst_port == dst_port) + continue; + + ret = tb_tunnel_consumed_bandwidth(tunnel, &dp_consumed_up, + &dp_consumed_down); + if (ret) + return ret; + + *consumed_up += dp_consumed_up; + *consumed_down += dp_consumed_down; + } + + return 0; +} + +static bool tb_asym_supported(struct tb_port *src_port, struct tb_port *dst_port, + struct tb_port *port) +{ + bool downstream = tb_port_path_direction_downstream(src_port, dst_port); + enum tb_link_width width; + + if (tb_is_upstream_port(port)) + width = downstream ? TB_LINK_WIDTH_ASYM_RX : TB_LINK_WIDTH_ASYM_TX; + else + width = downstream ? TB_LINK_WIDTH_ASYM_TX : TB_LINK_WIDTH_ASYM_RX; + + return tb_port_width_supported(port, width); +} + +/** + * tb_maximum_bandwidth() - Maximum bandwidth over a single link + * @tb: Domain structure + * @src_port: Source protocol adapter + * @dst_port: Destination protocol adapter + * @port: USB4 port the total bandwidth is calculated + * @max_up: Maximum upstream bandwidth (Mb/s) + * @max_down: Maximum downstream bandwidth (Mb/s) + * @include_asym: Include bandwidth if the link is switched from + * symmetric to asymmetric + * + * Returns maximum possible bandwidth in @max_up and @max_down over a + * single link at @port. If @include_asym is set then includes the + * additional banwdith if the links are transitioned into asymmetric to + * direction from @src_port to @dst_port. + */ +static int tb_maximum_bandwidth(struct tb *tb, struct tb_port *src_port, + struct tb_port *dst_port, struct tb_port *port, + int *max_up, int *max_down, bool include_asym) +{ + bool downstream = tb_port_path_direction_downstream(src_port, dst_port); + int link_speed, link_width, up_bw, down_bw; + + /* + * Can include asymmetric, only if it is actually supported by + * the lane adapter. + */ + if (!tb_asym_supported(src_port, dst_port, port)) + include_asym = false; + + if (tb_is_upstream_port(port)) { + link_speed = port->sw->link_speed; + /* + * sw->link_width is from upstream perspective so we use + * the opposite for downstream of the host router. + */ + if (port->sw->link_width == TB_LINK_WIDTH_ASYM_TX) { + up_bw = link_speed * 3 * 1000; + down_bw = link_speed * 1 * 1000; + } else if (port->sw->link_width == TB_LINK_WIDTH_ASYM_RX) { + up_bw = link_speed * 1 * 1000; + down_bw = link_speed * 3 * 1000; + } else if (include_asym) { /* - * sw->link_width is from upstream perspective - * so we use the opposite for downstream of the - * host router. + * The link is symmetric at the moment but we + * can switch it to asymmetric as needed. Report + * this bandwidth as available (even though it + * is not yet enabled). */ - if (port->sw->link_width == TB_LINK_WIDTH_ASYM_TX) { - up_bw = link_speed * 3 * 1000; - down_bw = link_speed * 1 * 1000; - } else if (port->sw->link_width == TB_LINK_WIDTH_ASYM_RX) { + if (downstream) { up_bw = link_speed * 1 * 1000; down_bw = link_speed * 3 * 1000; } else { - up_bw = link_speed * port->sw->link_width * 1000; - down_bw = up_bw; + up_bw = link_speed * 3 * 1000; + down_bw = link_speed * 1 * 1000; } } else { - link_speed = tb_port_get_link_speed(port); - if (link_speed < 0) - return link_speed; - - link_width = tb_port_get_link_width(port); - if (link_width < 0) - return link_width; - - if (link_width == TB_LINK_WIDTH_ASYM_TX) { + up_bw = link_speed * port->sw->link_width * 1000; + down_bw = up_bw; + } + } else { + link_speed = tb_port_get_link_speed(port); + if (link_speed < 0) + return link_speed; + + link_width = tb_port_get_link_width(port); + if (link_width < 0) + return link_width; + + if (link_width == TB_LINK_WIDTH_ASYM_TX) { + up_bw = link_speed * 1 * 1000; + down_bw = link_speed * 3 * 1000; + } else if (link_width == TB_LINK_WIDTH_ASYM_RX) { + up_bw = link_speed * 3 * 1000; + down_bw = link_speed * 1 * 1000; + } else if (include_asym) { + /* + * The link is symmetric at the moment but we + * can switch it to asymmetric as needed. Report + * this bandwidth as available (even though it + * is not yet enabled). + */ + if (downstream) { up_bw = link_speed * 1 * 1000; down_bw = link_speed * 3 * 1000; - } else if (link_width == TB_LINK_WIDTH_ASYM_RX) { + } else { up_bw = link_speed * 3 * 1000; down_bw = link_speed * 1 * 1000; - } else { - up_bw = link_speed * link_width * 1000; - down_bw = up_bw; } + } else { + up_bw = link_speed * link_width * 1000; + down_bw = up_bw; } + } - /* Leave 10% guard band */ - up_bw -= up_bw / 10; - down_bw -= down_bw / 10; - - tb_port_dbg(port, "link total bandwidth %d/%d Mb/s\n", up_bw, - down_bw); + /* Leave 10% guard band */ + *max_up = up_bw - up_bw / 10; + *max_down = down_bw - down_bw / 10; - /* - * Find all DP tunnels that cross the port and reduce - * their consumed bandwidth from the available. - */ - list_for_each_entry(tunnel, &tcm->tunnel_list, list) { - int dp_consumed_up, dp_consumed_down; + tb_port_dbg(port, "link maximum bandwidth %d/%d Mb/s\n", *max_up, *max_down); + return 0; +} - if (tb_tunnel_is_invalid(tunnel)) - continue; +/** + * tb_available_bandwidth() - Available bandwidth for tunneling + * @tb: Domain structure + * @src_port: Source protocol adapter + * @dst_port: Destination protocol adapter + * @available_up: Available bandwidth upstream (Mb/s) + * @available_down: Available bandwidth downstream (Mb/s) + * @include_asym: Include bandwidth if the link is switched from + * symmetric to asymmetric + * + * Calculates maximum available bandwidth for protocol tunneling between + * @src_port and @dst_port at the moment. This is minimum of maximum + * link bandwidth across all links reduced by currently consumed + * bandwidth on that link. + * + * If @include_asym is true then includes also bandwidth that can be + * added when the links are transitioned into asymmetric (but does not + * transition the links). + */ +static int tb_available_bandwidth(struct tb *tb, struct tb_port *src_port, + struct tb_port *dst_port, int *available_up, + int *available_down, bool include_asym) +{ + struct tb_port *port; + int ret; - if (!tb_tunnel_is_dp(tunnel)) - continue; + /* Maximum possible bandwidth asymmetric Gen 4 link is 120 Gb/s */ + *available_up = *available_down = 120000; - if (!tb_tunnel_port_on_path(tunnel, port)) - continue; + /* Find the minimum available bandwidth over all links */ + tb_for_each_port_on_path(src_port, dst_port, port) { + int max_up, max_down, consumed_up, consumed_down; - /* - * Ignore the DP tunnel between src_port and - * dst_port because it is the same tunnel and we - * may be re-calculating estimated bandwidth. - */ - if (tunnel->src_port == src_port && - tunnel->dst_port == dst_port) - continue; + if (!tb_port_is_null(port)) + continue; - ret = tb_tunnel_consumed_bandwidth(tunnel, - &dp_consumed_up, - &dp_consumed_down); - if (ret) - return ret; + ret = tb_maximum_bandwidth(tb, src_port, dst_port, port, + &max_up, &max_down, include_asym); + if (ret) + return ret; - up_bw -= dp_consumed_up; - down_bw -= dp_consumed_down; - } + ret = tb_consumed_usb3_pcie_bandwidth(tb, src_port, dst_port, + port, &consumed_up, + &consumed_down); + if (ret) + return ret; + max_up -= consumed_up; + max_down -= consumed_down; - /* - * If USB3 is tunneled from the host router down to the - * branch leading to port we need to take USB3 consumed - * bandwidth into account regardless whether it actually - * crosses the port. - */ - up_bw -= usb3_consumed_up; - down_bw -= usb3_consumed_down; + ret = tb_consumed_dp_bandwidth(tb, src_port, dst_port, port, + &consumed_up, &consumed_down); + if (ret) + return ret; + max_up -= consumed_up; + max_down -= consumed_down; - if (up_bw < *available_up) - *available_up = up_bw; - if (down_bw < *available_down) - *available_down = down_bw; + if (max_up < *available_up) + *available_up = max_up; + if (max_down < *available_down) + *available_down = max_down; } if (*available_up < 0) @@ -729,21 +931,21 @@ static void tb_reclaim_usb3_bandwidth(struct tb *tb, struct tb_port *src_port, if (!tunnel) return; - tb_dbg(tb, "reclaiming unused bandwidth for USB3\n"); + tb_tunnel_dbg(tunnel, "reclaiming unused bandwidth\n"); /* * Calculate available bandwidth for the first hop USB3 tunnel. * That determines the whole USB3 bandwidth for this branch. */ ret = tb_available_bandwidth(tb, tunnel->src_port, tunnel->dst_port, - &available_up, &available_down); + &available_up, &available_down, false); if (ret) { - tb_warn(tb, "failed to calculate available bandwidth\n"); + tb_tunnel_warn(tunnel, "failed to calculate available bandwidth\n"); return; } - tb_dbg(tb, "available bandwidth for USB3 %d/%d Mb/s\n", - available_up, available_down); + tb_tunnel_dbg(tunnel, "available bandwidth %d/%d Mb/s\n", available_up, + available_down); tb_tunnel_reclaim_available_bandwidth(tunnel, &available_up, &available_down); } @@ -794,8 +996,8 @@ static int tb_tunnel_usb3(struct tb *tb, struct tb_switch *sw) return ret; } - ret = tb_available_bandwidth(tb, down, up, &available_up, - &available_down); + ret = tb_available_bandwidth(tb, down, up, &available_up, &available_down, + false); if (ret) goto err_reclaim; @@ -856,6 +1058,225 @@ static int tb_create_usb3_tunnels(struct tb_switch *sw) return 0; } +/** + * tb_configure_asym() - Transition links to asymmetric if needed + * @tb: Domain structure + * @src_port: Source adapter to start the transition + * @dst_port: Destination adapter + * @requested_up: Additional bandwidth (Mb/s) required upstream + * @requested_down: Additional bandwidth (Mb/s) required downstream + * + * Transition links between @src_port and @dst_port into asymmetric, with + * three lanes in the direction from @src_port towards @dst_port and one lane + * in the opposite direction, if the bandwidth requirements + * (requested + currently consumed) on that link exceed @asym_threshold. + * + * Must be called with available >= requested over all links. + */ +static int tb_configure_asym(struct tb *tb, struct tb_port *src_port, + struct tb_port *dst_port, int requested_up, + int requested_down) +{ + struct tb_switch *sw; + bool clx, downstream; + struct tb_port *up; + int ret = 0; + + if (!asym_threshold) + return 0; + + /* Disable CL states before doing any transitions */ + downstream = tb_port_path_direction_downstream(src_port, dst_port); + /* Pick up router deepest in the hierarchy */ + if (downstream) + sw = dst_port->sw; + else + sw = src_port->sw; + + clx = tb_disable_clx(sw); + + tb_for_each_upstream_port_on_path(src_port, dst_port, up) { + int consumed_up, consumed_down; + enum tb_link_width width; + + ret = tb_consumed_dp_bandwidth(tb, src_port, dst_port, up, + &consumed_up, &consumed_down); + if (ret) + break; + + if (downstream) { + /* + * Downstream so make sure upstream is within the 36G + * (40G - guard band 10%), and the requested is above + * what the threshold is. + */ + if (consumed_up + requested_up >= TB_ASYM_MIN) { + ret = -ENOBUFS; + break; + } + /* Does consumed + requested exceed the threshold */ + if (consumed_down + requested_down < asym_threshold) + continue; + + width = TB_LINK_WIDTH_ASYM_RX; + } else { + /* Upstream, the opposite of above */ + if (consumed_down + requested_down >= TB_ASYM_MIN) { + ret = -ENOBUFS; + break; + } + if (consumed_up + requested_up < asym_threshold) + continue; + + width = TB_LINK_WIDTH_ASYM_TX; + } + + if (up->sw->link_width == width) + continue; + + if (!tb_port_width_supported(up, width)) + continue; + + tb_sw_dbg(up->sw, "configuring asymmetric link\n"); + + /* + * Here requested + consumed > threshold so we need to + * transtion the link into asymmetric now. + */ + ret = tb_switch_set_link_width(up->sw, width); + if (ret) { + tb_sw_warn(up->sw, "failed to set link width\n"); + break; + } + } + + /* Re-enable CL states if they were previosly enabled */ + if (clx) + tb_enable_clx(sw); + + return ret; +} + +/** + * tb_configure_sym() - Transition links to symmetric if possible + * @tb: Domain structure + * @src_port: Source adapter to start the transition + * @dst_port: Destination adapter + * @requested_up: New lower bandwidth request upstream (Mb/s) + * @requested_down: New lower bandwidth request downstream (Mb/s) + * + * Goes over each link from @src_port to @dst_port and tries to + * transition the link to symmetric if the currently consumed bandwidth + * allows. + */ +static int tb_configure_sym(struct tb *tb, struct tb_port *src_port, + struct tb_port *dst_port, int requested_up, + int requested_down) +{ + struct tb_switch *sw; + bool clx, downstream; + struct tb_port *up; + int ret = 0; + + if (!asym_threshold) + return 0; + + /* Disable CL states before doing any transitions */ + downstream = tb_port_path_direction_downstream(src_port, dst_port); + /* Pick up router deepest in the hierarchy */ + if (downstream) + sw = dst_port->sw; + else + sw = src_port->sw; + + clx = tb_disable_clx(sw); + + tb_for_each_upstream_port_on_path(src_port, dst_port, up) { + int consumed_up, consumed_down; + + /* Already symmetric */ + if (up->sw->link_width <= TB_LINK_WIDTH_DUAL) + continue; + /* Unplugged, no need to switch */ + if (up->sw->is_unplugged) + continue; + + ret = tb_consumed_dp_bandwidth(tb, src_port, dst_port, up, + &consumed_up, &consumed_down); + if (ret) + break; + + if (downstream) { + /* + * Downstream so we want the consumed_down < threshold. + * Upstream traffic should be less than 36G (40G + * guard band 10%) as the link was configured asymmetric + * already. + */ + if (consumed_down + requested_down >= asym_threshold) + continue; + } else { + if (consumed_up + requested_up >= asym_threshold) + continue; + } + + if (up->sw->link_width == TB_LINK_WIDTH_DUAL) + continue; + + tb_sw_dbg(up->sw, "configuring symmetric link\n"); + + ret = tb_switch_set_link_width(up->sw, TB_LINK_WIDTH_DUAL); + if (ret) { + tb_sw_warn(up->sw, "failed to set link width\n"); + break; + } + } + + /* Re-enable CL states if they were previosly enabled */ + if (clx) + tb_enable_clx(sw); + + return ret; +} + +static void tb_configure_link(struct tb_port *down, struct tb_port *up, + struct tb_switch *sw) +{ + struct tb *tb = sw->tb; + + /* Link the routers using both links if available */ + down->remote = up; + up->remote = down; + if (down->dual_link_port && up->dual_link_port) { + down->dual_link_port->remote = up->dual_link_port; + up->dual_link_port->remote = down->dual_link_port; + } + + /* + * Enable lane bonding if the link is currently two single lane + * links. + */ + if (sw->link_width < TB_LINK_WIDTH_DUAL) + tb_switch_set_link_width(sw, TB_LINK_WIDTH_DUAL); + + /* + * Device router that comes up as symmetric link is + * connected deeper in the hierarchy, we transition the links + * above into symmetric if bandwidth allows. + */ + if (tb_switch_depth(sw) > 1 && + tb_port_get_link_generation(up) >= 4 && + up->sw->link_width == TB_LINK_WIDTH_DUAL) { + struct tb_port *host_port; + + host_port = tb_port_at(tb_route(sw), tb->root_switch); + tb_configure_sym(tb, host_port, up, 0, 0); + } + + /* Set the link configured */ + tb_switch_configure_link(sw); +} + static void tb_scan_port(struct tb_port *port); /* @@ -964,19 +1385,9 @@ static void tb_scan_port(struct tb_port *port) goto out_rpm_put; } - /* Link the switches using both links if available */ upstream_port = tb_upstream_port(sw); - port->remote = upstream_port; - upstream_port->remote = port; - if (port->dual_link_port && upstream_port->dual_link_port) { - port->dual_link_port->remote = upstream_port->dual_link_port; - upstream_port->dual_link_port->remote = port->dual_link_port; - } + tb_configure_link(port, upstream_port, sw); - /* Enable lane bonding if supported */ - tb_switch_lane_bonding_enable(sw); - /* Set the link configured */ - tb_switch_configure_link(sw); /* * CL0s and CL1 are enabled and supported together. * Silently ignore CLx enabling in case CLx is not supported. @@ -1040,6 +1451,11 @@ static void tb_deactivate_and_free_tunnel(struct tb_tunnel *tunnel) * deallocated properly. */ tb_switch_dealloc_dp_resource(src_port->sw, src_port); + /* + * If bandwidth on a link is < asym_threshold + * transition the link to symmetric. + */ + tb_configure_sym(tb, src_port, dst_port, 0, 0); /* Now we can allow the domain to runtime suspend again */ pm_runtime_mark_last_busy(&dst_port->sw->dev); pm_runtime_put_autosuspend(&dst_port->sw->dev); @@ -1092,7 +1508,8 @@ static void tb_free_unplugged_children(struct tb_switch *sw) tb_retimer_remove_all(port); tb_remove_dp_resources(port->remote->sw); tb_switch_unconfigure_link(port->remote->sw); - tb_switch_lane_bonding_disable(port->remote->sw); + tb_switch_set_link_width(port->remote->sw, + TB_LINK_WIDTH_SINGLE); tb_switch_remove(port->remote->sw); port->remote = NULL; if (port->dual_link_port) @@ -1188,7 +1605,7 @@ tb_recalc_estimated_bandwidth_for_group(struct tb_bandwidth_group *group) ret = tb_release_unused_usb3_bandwidth(tb, first_tunnel->src_port, first_tunnel->dst_port); if (ret) { - tb_port_warn(in, + tb_tunnel_warn(tunnel, "failed to release unused bandwidth\n"); break; } @@ -1196,9 +1613,9 @@ tb_recalc_estimated_bandwidth_for_group(struct tb_bandwidth_group *group) out = tunnel->dst_port; ret = tb_available_bandwidth(tb, in, out, &estimated_up, - &estimated_down); + &estimated_down, true); if (ret) { - tb_port_warn(in, + tb_tunnel_warn(tunnel, "failed to re-calculate estimated bandwidth\n"); break; } @@ -1209,16 +1626,18 @@ tb_recalc_estimated_bandwidth_for_group(struct tb_bandwidth_group *group) * - available bandwidth along the path * - bandwidth allocated for USB 3.x but not used. */ - tb_port_dbg(in, "re-calculated estimated bandwidth %u/%u Mb/s\n", - estimated_up, estimated_down); + tb_tunnel_dbg(tunnel, + "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; if (usb4_dp_port_set_estimated_bandwidth(in, estimated_bw)) - tb_port_warn(in, "failed to update estimated bandwidth\n"); + tb_tunnel_warn(tunnel, + "failed to update estimated bandwidth\n"); } if (first_tunnel) @@ -1282,18 +1701,14 @@ static struct tb_port *tb_find_dp_out(struct tb *tb, struct tb_port *in) return NULL; } -static void tb_tunnel_dp(struct tb *tb) +static bool tb_tunnel_one_dp(struct tb *tb) { int available_up, available_down, ret, link_nr; struct tb_cm *tcm = tb_priv(tb); struct tb_port *port, *in, *out; + int consumed_up, consumed_down; struct tb_tunnel *tunnel; - if (!tb_acpi_may_tunnel_dp()) { - tb_dbg(tb, "DP tunneling disabled, not creating tunnel\n"); - return; - } - /* * Find pair of inactive DP IN and DP OUT adapters and then * establish a DP tunnel between them. @@ -1311,22 +1726,21 @@ static void tb_tunnel_dp(struct tb *tb) continue; } - tb_port_dbg(port, "DP IN available\n"); + in = port; + tb_port_dbg(in, "DP IN available\n"); out = tb_find_dp_out(tb, port); - if (out) { - in = port; + if (out) break; - } } if (!in) { tb_dbg(tb, "no suitable DP IN adapter available, not tunneling\n"); - return; + return false; } if (!out) { tb_dbg(tb, "no suitable DP OUT adapter available, not tunneling\n"); - return; + return false; } /* @@ -1369,7 +1783,8 @@ static void tb_tunnel_dp(struct tb *tb) goto err_detach_group; } - ret = tb_available_bandwidth(tb, in, out, &available_up, &available_down); + ret = tb_available_bandwidth(tb, in, out, &available_up, &available_down, + true); if (ret) goto err_reclaim_usb; @@ -1391,6 +1806,13 @@ static void tb_tunnel_dp(struct tb *tb) list_add_tail(&tunnel->list, &tcm->tunnel_list); tb_reclaim_usb3_bandwidth(tb, in, out); + /* + * Transition the links to asymmetric if the consumption exceeds + * the threshold. + */ + if (!tb_tunnel_consumed_bandwidth(tunnel, &consumed_up, &consumed_down)) + tb_configure_asym(tb, in, out, consumed_up, consumed_down); + /* Update the domain with the new bandwidth estimation */ tb_recalc_estimated_bandwidth(tb); @@ -1399,7 +1821,7 @@ static void tb_tunnel_dp(struct tb *tb) * TMU mode to HiFi for CL0s to work. */ tb_increase_tmu_accuracy(tunnel); - return; + return true; err_free: tb_tunnel_free(tunnel); @@ -1414,6 +1836,19 @@ err_rpm_put: pm_runtime_put_autosuspend(&out->sw->dev); pm_runtime_mark_last_busy(&in->sw->dev); pm_runtime_put_autosuspend(&in->sw->dev); + + return false; +} + +static void tb_tunnel_dp(struct tb *tb) +{ + if (!tb_acpi_may_tunnel_dp()) { + tb_dbg(tb, "DP tunneling disabled, not creating tunnel\n"); + return; + } + + while (tb_tunnel_one_dp(tb)) + ; } static void tb_dp_resource_unavailable(struct tb *tb, struct tb_port *port) @@ -1701,7 +2136,8 @@ static void tb_handle_hotplug(struct work_struct *work) tb_remove_dp_resources(port->remote->sw); tb_switch_tmu_disable(port->remote->sw); tb_switch_unconfigure_link(port->remote->sw); - tb_switch_lane_bonding_disable(port->remote->sw); + tb_switch_set_link_width(port->remote->sw, + TB_LINK_WIDTH_SINGLE); tb_switch_remove(port->remote->sw); port->remote = NULL; if (port->dual_link_port) @@ -1781,8 +2217,8 @@ static int tb_alloc_dp_bandwidth(struct tb_tunnel *tunnel, int *requested_up, in = tunnel->src_port; out = tunnel->dst_port; - tb_port_dbg(in, "bandwidth allocated currently %d/%d Mb/s\n", - allocated_up, allocated_down); + tb_tunnel_dbg(tunnel, "bandwidth allocated currently %d/%d Mb/s\n", + allocated_up, allocated_down); /* * If we get rounded up request from graphics side, say HBR2 x 4 @@ -1823,20 +2259,26 @@ static int tb_alloc_dp_bandwidth(struct tb_tunnel *tunnel, int *requested_up, else if (requested_down_corrected < 0) requested_down_corrected = 0; - tb_port_dbg(in, "corrected bandwidth request %d/%d Mb/s\n", - requested_up_corrected, requested_down_corrected); + tb_tunnel_dbg(tunnel, "corrected bandwidth request %d/%d Mb/s\n", + requested_up_corrected, requested_down_corrected); if ((*requested_up >= 0 && requested_up_corrected > max_up_rounded) || (*requested_down >= 0 && requested_down_corrected > max_down_rounded)) { - tb_port_dbg(in, "bandwidth request too high (%d/%d Mb/s > %d/%d Mb/s)\n", - requested_up_corrected, requested_down_corrected, - max_up_rounded, max_down_rounded); + tb_tunnel_dbg(tunnel, + "bandwidth request too high (%d/%d Mb/s > %d/%d Mb/s)\n", + requested_up_corrected, requested_down_corrected, + max_up_rounded, max_down_rounded); return -ENOBUFS; } if ((*requested_up >= 0 && requested_up_corrected <= allocated_up) || (*requested_down >= 0 && requested_down_corrected <= allocated_down)) { /* + * If bandwidth on a link is < asym_threshold transition + * the link to symmetric. + */ + tb_configure_sym(tb, in, out, *requested_up, *requested_down); + /* * If requested bandwidth is less or equal than what is * currently allocated to that tunnel we simply change * the reservation of the tunnel. Since all the tunnels @@ -1861,17 +2303,33 @@ static int tb_alloc_dp_bandwidth(struct tb_tunnel *tunnel, int *requested_up, * are also in the same group but we use the same function here * that we use with the normal bandwidth allocation). */ - ret = tb_available_bandwidth(tb, in, out, &available_up, &available_down); + ret = tb_available_bandwidth(tb, in, out, &available_up, &available_down, + true); if (ret) goto reclaim; - tb_port_dbg(in, "bandwidth available for allocation %d/%d Mb/s\n", - available_up, available_down); + tb_tunnel_dbg(tunnel, "bandwidth available for allocation %d/%d Mb/s\n", + available_up, available_down); if ((*requested_up >= 0 && available_up >= requested_up_corrected) || (*requested_down >= 0 && available_down >= requested_down_corrected)) { + /* + * If bandwidth on a link is >= asym_threshold + * transition the link to asymmetric. + */ + ret = tb_configure_asym(tb, in, out, *requested_up, + *requested_down); + if (ret) { + tb_configure_sym(tb, in, out, 0, 0); + return ret; + } + ret = tb_tunnel_alloc_bandwidth(tunnel, requested_up, requested_down); + if (ret) { + tb_tunnel_warn(tunnel, "failed to allocate bandwidth\n"); + tb_configure_sym(tb, in, out, 0, 0); + } } else { ret = -ENOBUFS; } @@ -1937,7 +2395,7 @@ 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 { @@ -1948,12 +2406,15 @@ static void tb_handle_dp_bandwidth_request(struct work_struct *work) ret = tb_alloc_dp_bandwidth(tunnel, &requested_up, &requested_down); if (ret) { if (ret == -ENOBUFS) - tb_port_warn(in, "not enough bandwidth available\n"); + tb_tunnel_warn(tunnel, + "not enough bandwidth available\n"); else - tb_port_warn(in, "failed to change bandwidth allocation\n"); + tb_tunnel_warn(tunnel, + "failed to change bandwidth allocation\n"); } else { - tb_port_dbg(in, "bandwidth allocation changed to %d/%d Mb/s\n", - requested_up, requested_down); + tb_tunnel_dbg(tunnel, + "bandwidth allocation changed to %d/%d Mb/s\n", + requested_up, requested_down); /* Update other clients about the allocation change */ tb_recalc_estimated_bandwidth(tb); @@ -2181,7 +2642,8 @@ static void tb_restore_children(struct tb_switch *sw) continue; if (port->remote) { - tb_switch_lane_bonding_enable(port->remote->sw); + tb_switch_set_link_width(port->remote->sw, + port->remote->sw->link_width); tb_switch_configure_link(port->remote->sw); tb_restore_children(port->remote->sw); |