diff options
Diffstat (limited to 'drivers/thunderbolt/tb.c')
| -rw-r--r-- | drivers/thunderbolt/tb.c | 1007 |
1 files changed, 885 insertions, 122 deletions
diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c index 1f7a9e1cc09c..ad3c285026d5 100644 --- a/drivers/thunderbolt/tb.c +++ b/drivers/thunderbolt/tb.c @@ -9,7 +9,7 @@ #include <linux/slab.h> #include <linux/errno.h> #include <linux/delay.h> -#include <linux/platform_data/x86/apple.h> +#include <linux/pm_runtime.h> #include "tb.h" #include "tb_regs.h" @@ -18,16 +18,26 @@ /** * struct tb_cm - Simple Thunderbolt connection manager * @tunnel_list: List of active tunnels + * @dp_resources: List of available DP resources for DP tunneling * @hotplug_active: tb_handle_hotplug will stop progressing plug * events and exit if this is not set (it needs to * acquire the lock one more time). Used to drain wq * after cfg has been paused. + * @remove_work: Work used to remove any unplugged routers after + * runtime resume */ struct tb_cm { struct list_head tunnel_list; + struct list_head dp_resources; bool hotplug_active; + struct delayed_work remove_work; }; +static inline struct tb *tcm_to_tb(struct tb_cm *tcm) +{ + return ((void *)tcm - sizeof(struct tb)); +} + struct tb_hotplug_event { struct work_struct work; struct tb *tb; @@ -56,17 +66,51 @@ static void tb_queue_hotplug(struct tb *tb, u64 route, u8 port, bool unplug) /* enumeration & hot plug handling */ +static void tb_add_dp_resources(struct tb_switch *sw) +{ + struct tb_cm *tcm = tb_priv(sw->tb); + struct tb_port *port; + + tb_switch_for_each_port(sw, port) { + if (!tb_port_is_dpin(port)) + continue; + + if (!tb_switch_query_dp_resource(sw, port)) + continue; + + list_add_tail(&port->list, &tcm->dp_resources); + tb_port_dbg(port, "DP IN resource available\n"); + } +} + +static void tb_remove_dp_resources(struct tb_switch *sw) +{ + struct tb_cm *tcm = tb_priv(sw->tb); + struct tb_port *port, *tmp; + + /* Clear children resources first */ + tb_switch_for_each_port(sw, port) { + if (tb_port_has_remote(port)) + tb_remove_dp_resources(port->remote->sw); + } + + list_for_each_entry_safe(port, tmp, &tcm->dp_resources, list) { + if (port->sw == sw) { + tb_port_dbg(port, "DP OUT resource unavailable\n"); + list_del_init(&port->list); + } + } +} + static void tb_discover_tunnels(struct tb_switch *sw) { struct tb *tb = sw->tb; struct tb_cm *tcm = tb_priv(tb); struct tb_port *port; - int i; - for (i = 1; i <= sw->config.max_port_number; i++) { + tb_switch_for_each_port(sw, port) { struct tb_tunnel *tunnel = NULL; - port = &sw->ports[i]; switch (port->config.type) { case TB_TYPE_DP_HDMI_IN: tunnel = tb_tunnel_discover_dp(tb, port); @@ -76,6 +120,10 @@ static void tb_discover_tunnels(struct tb_switch *sw) tunnel = tb_tunnel_discover_pci(tb, port); break; + case TB_TYPE_USB3_DOWN: + tunnel = tb_tunnel_discover_usb3(tb, port); + break; + default: break; } @@ -95,12 +143,35 @@ static void tb_discover_tunnels(struct tb_switch *sw) list_add_tail(&tunnel->list, &tcm->tunnel_list); } - for (i = 1; i <= sw->config.max_port_number; i++) { - if (tb_port_has_remote(&sw->ports[i])) - tb_discover_tunnels(sw->ports[i].remote->sw); + tb_switch_for_each_port(sw, port) { + if (tb_port_has_remote(port)) + tb_discover_tunnels(port->remote->sw); } } +static int tb_port_configure_xdomain(struct tb_port *port) +{ + /* + * XDomain paths currently only support single lane so we must + * disable the other lane according to USB4 spec. + */ + tb_port_disable(port->dual_link_port); + + if (tb_switch_is_usb4(port->sw)) + return usb4_port_configure_xdomain(port); + return tb_lc_configure_xdomain(port); +} + +static void tb_port_unconfigure_xdomain(struct tb_port *port) +{ + if (tb_switch_is_usb4(port->sw)) + usb4_port_unconfigure_xdomain(port); + else + tb_lc_unconfigure_xdomain(port); + + tb_port_enable(port->dual_link_port); +} + static void tb_scan_xdomain(struct tb_port *port) { struct tb_switch *sw = port->sw; @@ -108,6 +179,9 @@ static void tb_scan_xdomain(struct tb_port *port) struct tb_xdomain *xd; u64 route; + if (!tb_is_xdomain_enabled()) + return; + route = tb_downstream_route(port); xd = tb_xdomain_find_by_route(tb, route); if (xd) { @@ -119,23 +193,361 @@ static void tb_scan_xdomain(struct tb_port *port) NULL); if (xd) { tb_port_at(route, sw)->xdomain = xd; + tb_port_configure_xdomain(port); tb_xdomain_add(xd); } } -static void tb_scan_port(struct tb_port *port); +static int tb_enable_tmu(struct tb_switch *sw) +{ + int ret; + + /* If it is already enabled in correct mode, don't touch it */ + if (tb_switch_tmu_is_enabled(sw)) + return 0; + + ret = tb_switch_tmu_disable(sw); + if (ret) + return ret; + + ret = tb_switch_tmu_post_time(sw); + if (ret) + return ret; + + return tb_switch_tmu_enable(sw); +} /** + * tb_find_unused_port() - return the first inactive port on @sw + * @sw: Switch to find the port on + * @type: Port type to look for + */ +static struct tb_port *tb_find_unused_port(struct tb_switch *sw, + enum tb_port_type type) +{ + struct tb_port *port; + + tb_switch_for_each_port(sw, port) { + if (tb_is_upstream_port(port)) + continue; + if (port->config.type != type) + continue; + if (!port->cap_adap) + continue; + if (tb_port_is_enabled(port)) + continue; + return port; + } + return NULL; +} + +static struct tb_port *tb_find_usb3_down(struct tb_switch *sw, + const struct tb_port *port) +{ + struct tb_port *down; + + down = usb4_switch_map_usb3_down(sw, port); + if (down && !tb_usb3_port_is_enabled(down)) + return down; + return NULL; +} + +static struct tb_tunnel *tb_find_tunnel(struct tb *tb, enum tb_tunnel_type type, + struct tb_port *src_port, + struct tb_port *dst_port) +{ + struct tb_cm *tcm = tb_priv(tb); + struct tb_tunnel *tunnel; + + list_for_each_entry(tunnel, &tcm->tunnel_list, list) { + if (tunnel->type == type && + ((src_port && src_port == tunnel->src_port) || + (dst_port && dst_port == tunnel->dst_port))) { + return tunnel; + } + } + + return NULL; +} + +static struct tb_tunnel *tb_find_first_usb3_tunnel(struct tb *tb, + struct tb_port *src_port, + struct tb_port *dst_port) +{ + struct tb_port *port, *usb3_down; + struct tb_switch *sw; + + /* Pick the router that is deepest in the topology */ + if (dst_port->sw->config.depth > src_port->sw->config.depth) + sw = dst_port->sw; + else + sw = src_port->sw; + + /* Can't be the host router */ + if (sw == tb->root_switch) + return NULL; + + /* Find the downstream USB4 port that leads to this router */ + port = tb_port_at(tb_route(sw), tb->root_switch); + /* Find the corresponding host router USB3 downstream port */ + usb3_down = usb4_switch_map_usb3_down(tb->root_switch, port); + if (!usb3_down) + return NULL; + + 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); + struct tb_tunnel *tunnel; + struct tb_port *port; + + tb_port_dbg(dst_port, "calculating available bandwidth\n"); + + tunnel = tb_find_first_usb3_tunnel(tb, src_port, dst_port); + if (tunnel) { + ret = tb_tunnel_consumed_bandwidth(tunnel, &usb3_consumed_up, + &usb3_consumed_down); + if (ret) + return ret; + } else { + usb3_consumed_up = 0; + usb3_consumed_down = 0; + } + + *available_up = *available_down = 40000; + + /* 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; + + if (!tb_port_is_null(port)) + continue; + + if (tb_is_upstream_port(port)) { + link_speed = port->sw->link_speed; + } else { + link_speed = tb_port_get_link_speed(port); + if (link_speed < 0) + return link_speed; + } + + link_width = port->bonded ? 2 : 1; + + up_bw = link_speed * link_width * 1000; /* Mb/s */ + /* Leave 10% guard band */ + up_bw -= up_bw / 10; + down_bw = up_bw; + + tb_port_dbg(port, "link total bandwidth %d Mb/s\n", up_bw); + + /* + * 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_dp(tunnel)) + continue; + + if (!tb_tunnel_port_on_path(tunnel, port)) + continue; + + ret = tb_tunnel_consumed_bandwidth(tunnel, + &dp_consumed_up, + &dp_consumed_down); + if (ret) + return ret; + + up_bw -= dp_consumed_up; + down_bw -= dp_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; + + if (up_bw < *available_up) + *available_up = up_bw; + if (down_bw < *available_down) + *available_down = down_bw; + } + + if (*available_up < 0) + *available_up = 0; + if (*available_down < 0) + *available_down = 0; + + return 0; +} + +static int tb_release_unused_usb3_bandwidth(struct tb *tb, + struct tb_port *src_port, + struct tb_port *dst_port) +{ + struct tb_tunnel *tunnel; + + tunnel = tb_find_first_usb3_tunnel(tb, src_port, dst_port); + return tunnel ? tb_tunnel_release_unused_bandwidth(tunnel) : 0; +} + +static void tb_reclaim_usb3_bandwidth(struct tb *tb, struct tb_port *src_port, + struct tb_port *dst_port) +{ + int ret, available_up, available_down; + struct tb_tunnel *tunnel; + + tunnel = tb_find_first_usb3_tunnel(tb, src_port, dst_port); + if (!tunnel) + return; + + tb_dbg(tb, "reclaiming unused bandwidth for USB3\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); + if (ret) { + tb_warn(tb, "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_reclaim_available_bandwidth(tunnel, &available_up, &available_down); +} + +static int tb_tunnel_usb3(struct tb *tb, struct tb_switch *sw) +{ + struct tb_switch *parent = tb_switch_parent(sw); + int ret, available_up, available_down; + struct tb_port *up, *down, *port; + struct tb_cm *tcm = tb_priv(tb); + struct tb_tunnel *tunnel; + + up = tb_switch_find_port(sw, TB_TYPE_USB3_UP); + if (!up) + return 0; + + if (!sw->link_usb4) + return 0; + + /* + * Look up available down port. Since we are chaining it should + * be found right above this switch. + */ + port = tb_port_at(tb_route(sw), parent); + down = tb_find_usb3_down(parent, port); + if (!down) + return 0; + + if (tb_route(parent)) { + struct tb_port *parent_up; + /* + * Check first that the parent switch has its upstream USB3 + * port enabled. Otherwise the chain is not complete and + * there is no point setting up a new tunnel. + */ + parent_up = tb_switch_find_port(parent, TB_TYPE_USB3_UP); + if (!parent_up || !tb_port_is_enabled(parent_up)) + return 0; + + /* Make all unused bandwidth available for the new tunnel */ + ret = tb_release_unused_usb3_bandwidth(tb, down, up); + if (ret) + return ret; + } + + ret = tb_available_bandwidth(tb, down, up, &available_up, + &available_down); + if (ret) + goto err_reclaim; + + tb_port_dbg(up, "available bandwidth for new USB3 tunnel %d/%d Mb/s\n", + available_up, available_down); + + tunnel = tb_tunnel_alloc_usb3(tb, up, down, available_up, + available_down); + if (!tunnel) { + ret = -ENOMEM; + goto err_reclaim; + } + + if (tb_tunnel_activate(tunnel)) { + tb_port_info(up, + "USB3 tunnel activation failed, aborting\n"); + ret = -EIO; + goto err_free; + } + + list_add_tail(&tunnel->list, &tcm->tunnel_list); + if (tb_route(parent)) + tb_reclaim_usb3_bandwidth(tb, down, up); + + return 0; + +err_free: + tb_tunnel_free(tunnel); +err_reclaim: + if (tb_route(parent)) + tb_reclaim_usb3_bandwidth(tb, down, up); + + return ret; +} + +static int tb_create_usb3_tunnels(struct tb_switch *sw) +{ + struct tb_port *port; + int ret; + + if (tb_route(sw)) { + ret = tb_tunnel_usb3(sw->tb, sw); + if (ret) + return ret; + } + + tb_switch_for_each_port(sw, port) { + if (!tb_port_has_remote(port)) + continue; + ret = tb_create_usb3_tunnels(port->remote->sw); + if (ret) + return ret; + } + + return 0; +} + +static void tb_scan_port(struct tb_port *port); + +/* * tb_scan_switch() - scan for and initialize downstream switches */ static void tb_scan_switch(struct tb_switch *sw) { - int i; - for (i = 1; i <= sw->config.max_port_number; i++) - tb_scan_port(&sw->ports[i]); + struct tb_port *port; + + pm_runtime_get_sync(&sw->dev); + + tb_switch_for_each_port(sw, port) + tb_scan_port(port); + + pm_runtime_mark_last_busy(&sw->dev); + pm_runtime_put_autosuspend(&sw->dev); } -/** +/* * tb_scan_port() - check for and initialize switches below port */ static void tb_scan_port(struct tb_port *port) @@ -168,6 +580,9 @@ static void tb_scan_port(struct tb_port *port) tb_port_dbg(port, "port already has a remote\n"); return; } + + tb_retimer_scan(port); + sw = tb_switch_alloc(port->sw->tb, &port->sw->dev, tb_downstream_route(port)); if (IS_ERR(sw)) { @@ -192,6 +607,7 @@ static void tb_scan_port(struct tb_port *port) */ if (port->xdomain) { tb_xdomain_remove(port->xdomain); + tb_port_unconfigure_xdomain(port); port->xdomain = NULL; } @@ -203,6 +619,12 @@ static void tb_scan_port(struct tb_port *port) if (!tcm->hotplug_active) dev_set_uevent_suppress(&sw->dev, true); + /* + * At the moment Thunderbolt 2 and beyond (devices with LC) we + * can support runtime PM. + */ + sw->rpm = sw->generation > 1; + if (tb_switch_add(sw)) { tb_switch_put(sw); return; @@ -217,30 +639,75 @@ static void tb_scan_port(struct tb_port *port) upstream_port->dual_link_port->remote = port->dual_link_port; } + /* Enable lane bonding if supported */ + tb_switch_lane_bonding_enable(sw); + /* Set the link configured */ + tb_switch_configure_link(sw); + + if (tb_enable_tmu(sw)) + tb_sw_warn(sw, "failed to enable TMU\n"); + + /* Scan upstream retimers */ + tb_retimer_scan(upstream_port); + + /* + * Create USB 3.x tunnels only when the switch is plugged to the + * domain. This is because we scan the domain also during discovery + * and want to discover existing USB 3.x tunnels before we create + * any new. + */ + if (tcm->hotplug_active && tb_tunnel_usb3(sw->tb, sw)) + tb_sw_warn(sw, "USB3 tunnel creation failed\n"); + + tb_add_dp_resources(sw); tb_scan_switch(sw); } -static int tb_free_tunnel(struct tb *tb, enum tb_tunnel_type type, - struct tb_port *src_port, struct tb_port *dst_port) +static void tb_deactivate_and_free_tunnel(struct tb_tunnel *tunnel) { - struct tb_cm *tcm = tb_priv(tb); - struct tb_tunnel *tunnel; + struct tb_port *src_port, *dst_port; + struct tb *tb; - list_for_each_entry(tunnel, &tcm->tunnel_list, list) { - if (tunnel->type == type && - ((src_port && src_port == tunnel->src_port) || - (dst_port && dst_port == tunnel->dst_port))) { - tb_tunnel_deactivate(tunnel); - list_del(&tunnel->list); - tb_tunnel_free(tunnel); - return 0; - } + if (!tunnel) + return; + + tb_tunnel_deactivate(tunnel); + list_del(&tunnel->list); + + tb = tunnel->tb; + src_port = tunnel->src_port; + dst_port = tunnel->dst_port; + + switch (tunnel->type) { + case TB_TUNNEL_DP: + /* + * In case of DP tunnel make sure the DP IN resource is + * deallocated properly. + */ + tb_switch_dealloc_dp_resource(src_port->sw, src_port); + /* 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); + pm_runtime_mark_last_busy(&src_port->sw->dev); + pm_runtime_put_autosuspend(&src_port->sw->dev); + fallthrough; + + case TB_TUNNEL_USB3: + tb_reclaim_usb3_bandwidth(tb, src_port, dst_port); + break; + + default: + /* + * PCIe and DMA tunnels do not consume guaranteed + * bandwidth. + */ + break; } - return -ENODEV; + tb_tunnel_free(tunnel); } -/** +/* * tb_free_invalid_tunnels() - destroy tunnels of devices that have gone away */ static void tb_free_invalid_tunnels(struct tb *tb) @@ -250,27 +717,27 @@ static void tb_free_invalid_tunnels(struct tb *tb) struct tb_tunnel *n; list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) { - if (tb_tunnel_is_invalid(tunnel)) { - tb_tunnel_deactivate(tunnel); - list_del(&tunnel->list); - tb_tunnel_free(tunnel); - } + if (tb_tunnel_is_invalid(tunnel)) + tb_deactivate_and_free_tunnel(tunnel); } } -/** +/* * tb_free_unplugged_children() - traverse hierarchy and free unplugged switches */ static void tb_free_unplugged_children(struct tb_switch *sw) { - int i; - for (i = 1; i <= sw->config.max_port_number; i++) { - struct tb_port *port = &sw->ports[i]; + struct tb_port *port; + tb_switch_for_each_port(sw, port) { if (!tb_port_has_remote(port)) continue; if (port->remote->sw->is_unplugged) { + 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_remove(port->remote->sw); port->remote = NULL; if (port->dual_link_port) @@ -281,54 +748,18 @@ static void tb_free_unplugged_children(struct tb_switch *sw) } } -/** - * tb_find_port() - return the first port of @type on @sw or NULL - * @sw: Switch to find the port from - * @type: Port type to look for - */ -static struct tb_port *tb_find_port(struct tb_switch *sw, - enum tb_port_type type) -{ - int i; - for (i = 1; i <= sw->config.max_port_number; i++) - if (sw->ports[i].config.type == type) - return &sw->ports[i]; - return NULL; -} - -/** - * tb_find_unused_port() - return the first inactive port on @sw - * @sw: Switch to find the port on - * @type: Port type to look for - */ -static struct tb_port *tb_find_unused_port(struct tb_switch *sw, - enum tb_port_type type) -{ - int i; - - for (i = 1; i <= sw->config.max_port_number; i++) { - if (tb_is_upstream_port(&sw->ports[i])) - continue; - if (sw->ports[i].config.type != type) - continue; - if (!sw->ports[i].cap_adap) - continue; - if (tb_port_is_enabled(&sw->ports[i])) - continue; - return &sw->ports[i]; - } - return NULL; -} - static struct tb_port *tb_find_pcie_down(struct tb_switch *sw, const struct tb_port *port) { + struct tb_port *down = NULL; + /* * To keep plugging devices consistently in the same PCIe - * hierarchy, do mapping here for root switch downstream PCIe - * ports. + * hierarchy, do mapping here for switch downstream PCIe ports. */ - if (!tb_route(sw)) { + if (tb_switch_is_usb4(sw)) { + down = usb4_switch_map_pcie_down(sw, port); + } else if (!tb_route(sw)) { int phy_port = tb_phy_port_from_link(port->port); int index; @@ -336,64 +767,261 @@ static struct tb_port *tb_find_pcie_down(struct tb_switch *sw, * Hard-coded Thunderbolt port to PCIe down port mapping * per controller. */ - if (tb_switch_is_cr(sw)) + if (tb_switch_is_cactus_ridge(sw) || + tb_switch_is_alpine_ridge(sw)) index = !phy_port ? 6 : 7; - else if (tb_switch_is_fr(sw)) + else if (tb_switch_is_falcon_ridge(sw)) index = !phy_port ? 6 : 8; + else if (tb_switch_is_titan_ridge(sw)) + index = !phy_port ? 8 : 9; else goto out; /* Validate the hard-coding */ if (WARN_ON(index > sw->config.max_port_number)) goto out; - if (WARN_ON(!tb_port_is_pcie_down(&sw->ports[index]))) + + down = &sw->ports[index]; + } + + if (down) { + if (WARN_ON(!tb_port_is_pcie_down(down))) goto out; - if (WARN_ON(tb_pci_port_is_enabled(&sw->ports[index]))) + if (tb_pci_port_is_enabled(down)) goto out; - return &sw->ports[index]; + return down; } out: return tb_find_unused_port(sw, TB_TYPE_PCIE_DOWN); } -static int tb_tunnel_dp(struct tb *tb, struct tb_port *out) +static struct tb_port *tb_find_dp_out(struct tb *tb, struct tb_port *in) +{ + struct tb_port *host_port, *port; + struct tb_cm *tcm = tb_priv(tb); + + host_port = tb_route(in->sw) ? + tb_port_at(tb_route(in->sw), tb->root_switch) : NULL; + + list_for_each_entry(port, &tcm->dp_resources, list) { + if (!tb_port_is_dpout(port)) + continue; + + if (tb_port_is_enabled(port)) { + tb_port_dbg(port, "in use\n"); + continue; + } + + tb_port_dbg(port, "DP OUT available\n"); + + /* + * Keep the DP tunnel under the topology starting from + * the same host router downstream port. + */ + if (host_port && tb_route(port->sw)) { + struct tb_port *p; + + p = tb_port_at(tb_route(port->sw), tb->root_switch); + if (p != host_port) + continue; + } + + return port; + } + + return NULL; +} + +static void tb_tunnel_dp(struct tb *tb) { + int available_up, available_down, ret; struct tb_cm *tcm = tb_priv(tb); - struct tb_switch *sw = out->sw; + struct tb_port *port, *in, *out; struct tb_tunnel *tunnel; - struct tb_port *in; - if (tb_port_is_enabled(out)) - return 0; + /* + * Find pair of inactive DP IN and DP OUT adapters and then + * establish a DP tunnel between them. + */ + tb_dbg(tb, "looking for DP IN <-> DP OUT pairs:\n"); - do { - sw = tb_to_switch(sw->dev.parent); - if (!sw) - return 0; - in = tb_find_unused_port(sw, TB_TYPE_DP_HDMI_IN); - } while (!in); + in = NULL; + out = NULL; + list_for_each_entry(port, &tcm->dp_resources, list) { + if (!tb_port_is_dpin(port)) + continue; + + if (tb_port_is_enabled(port)) { + tb_port_dbg(port, "in use\n"); + continue; + } + + tb_port_dbg(port, "DP IN available\n"); + + out = tb_find_dp_out(tb, port); + if (out) { + in = port; + break; + } + } + + if (!in) { + tb_dbg(tb, "no suitable DP IN adapter available, not tunneling\n"); + return; + } + if (!out) { + tb_dbg(tb, "no suitable DP OUT adapter available, not tunneling\n"); + return; + } + + /* + * DP stream needs the domain to be active so runtime resume + * both ends of the tunnel. + * + * This should bring the routers in the middle active as well + * and keeps the domain from runtime suspending while the DP + * tunnel is active. + */ + pm_runtime_get_sync(&in->sw->dev); + pm_runtime_get_sync(&out->sw->dev); + + if (tb_switch_alloc_dp_resource(in->sw, in)) { + tb_port_dbg(in, "no resource available for DP IN, not tunneling\n"); + goto err_rpm_put; + } + + /* Make all unused USB3 bandwidth available for the new DP tunnel */ + ret = tb_release_unused_usb3_bandwidth(tb, in, out); + if (ret) { + tb_warn(tb, "failed to release unused bandwidth\n"); + goto err_dealloc_dp; + } + + ret = tb_available_bandwidth(tb, in, out, &available_up, + &available_down); + if (ret) + goto err_reclaim; + + tb_dbg(tb, "available bandwidth for new DP tunnel %u/%u Mb/s\n", + available_up, available_down); - tunnel = tb_tunnel_alloc_dp(tb, in, out); + tunnel = tb_tunnel_alloc_dp(tb, in, out, available_up, available_down); if (!tunnel) { - tb_port_dbg(out, "DP tunnel allocation failed\n"); - return -ENOMEM; + tb_port_dbg(out, "could not allocate DP tunnel\n"); + goto err_reclaim; } if (tb_tunnel_activate(tunnel)) { tb_port_info(out, "DP tunnel activation failed, aborting\n"); - tb_tunnel_free(tunnel); - return -EIO; + goto err_free; } list_add_tail(&tunnel->list, &tcm->tunnel_list); - return 0; + tb_reclaim_usb3_bandwidth(tb, in, out); + return; + +err_free: + tb_tunnel_free(tunnel); +err_reclaim: + tb_reclaim_usb3_bandwidth(tb, in, out); +err_dealloc_dp: + tb_switch_dealloc_dp_resource(in->sw, in); +err_rpm_put: + pm_runtime_mark_last_busy(&out->sw->dev); + pm_runtime_put_autosuspend(&out->sw->dev); + pm_runtime_mark_last_busy(&in->sw->dev); + pm_runtime_put_autosuspend(&in->sw->dev); +} + +static void tb_dp_resource_unavailable(struct tb *tb, struct tb_port *port) +{ + struct tb_port *in, *out; + struct tb_tunnel *tunnel; + + if (tb_port_is_dpin(port)) { + tb_port_dbg(port, "DP IN resource unavailable\n"); + in = port; + out = NULL; + } else { + tb_port_dbg(port, "DP OUT resource unavailable\n"); + in = NULL; + out = port; + } + + tunnel = tb_find_tunnel(tb, TB_TUNNEL_DP, in, out); + tb_deactivate_and_free_tunnel(tunnel); + list_del_init(&port->list); + + /* + * See if there is another DP OUT port that can be used for + * to create another tunnel. + */ + tb_tunnel_dp(tb); +} + +static void tb_dp_resource_available(struct tb *tb, struct tb_port *port) +{ + struct tb_cm *tcm = tb_priv(tb); + struct tb_port *p; + + if (tb_port_is_enabled(port)) + return; + + list_for_each_entry(p, &tcm->dp_resources, list) { + if (p == port) + return; + } + + tb_port_dbg(port, "DP %s resource available\n", + tb_port_is_dpin(port) ? "IN" : "OUT"); + list_add_tail(&port->list, &tcm->dp_resources); + + /* Look for suitable DP IN <-> DP OUT pairs now */ + tb_tunnel_dp(tb); +} + +static void tb_disconnect_and_release_dp(struct tb *tb) +{ + struct tb_cm *tcm = tb_priv(tb); + struct tb_tunnel *tunnel, *n; + + /* + * Tear down all DP tunnels and release their resources. They + * will be re-established after resume based on plug events. + */ + list_for_each_entry_safe_reverse(tunnel, n, &tcm->tunnel_list, list) { + if (tb_tunnel_is_dp(tunnel)) + tb_deactivate_and_free_tunnel(tunnel); + } + + while (!list_empty(&tcm->dp_resources)) { + struct tb_port *port; + + port = list_first_entry(&tcm->dp_resources, + struct tb_port, list); + list_del_init(&port->list); + } } -static void tb_teardown_dp(struct tb *tb, struct tb_port *out) +static int tb_disconnect_pci(struct tb *tb, struct tb_switch *sw) { - tb_free_tunnel(tb, TB_TUNNEL_DP, NULL, out); + struct tb_tunnel *tunnel; + struct tb_port *up; + + up = tb_switch_find_port(sw, TB_TYPE_PCIE_UP); + if (WARN_ON(!up)) + return -ENODEV; + + tunnel = tb_find_tunnel(tb, TB_TUNNEL_PCI, NULL, up); + if (WARN_ON(!tunnel)) + return -ENODEV; + + tb_tunnel_deactivate(tunnel); + list_del(&tunnel->list); + tb_tunnel_free(tunnel); + return 0; } static int tb_tunnel_pci(struct tb *tb, struct tb_switch *sw) @@ -403,7 +1031,7 @@ static int tb_tunnel_pci(struct tb *tb, struct tb_switch *sw) struct tb_switch *parent_sw; struct tb_tunnel *tunnel; - up = tb_find_port(sw, TB_TYPE_PCIE_UP); + up = tb_switch_find_port(sw, TB_TYPE_PCIE_UP); if (!up) return 0; @@ -441,7 +1069,7 @@ static int tb_approve_xdomain_paths(struct tb *tb, struct tb_xdomain *xd) sw = tb_to_switch(xd->dev.parent); dst_port = tb_port_at(xd->route, sw); - nhi_port = tb_find_port(tb->root_switch, TB_TYPE_NHI); + nhi_port = tb_switch_find_port(tb->root_switch, TB_TYPE_NHI); mutex_lock(&tb->lock); tunnel = tb_tunnel_alloc_dma(tb, nhi_port, dst_port, xd->transmit_ring, @@ -468,6 +1096,7 @@ static int tb_approve_xdomain_paths(struct tb *tb, struct tb_xdomain *xd) static void __tb_disconnect_xdomain_paths(struct tb *tb, struct tb_xdomain *xd) { struct tb_port *dst_port; + struct tb_tunnel *tunnel; struct tb_switch *sw; sw = tb_to_switch(xd->dev.parent); @@ -478,7 +1107,8 @@ static void __tb_disconnect_xdomain_paths(struct tb *tb, struct tb_xdomain *xd) * case of cable disconnect) so it is fine if we cannot find it * here anymore. */ - tb_free_tunnel(tb, TB_TUNNEL_DMA, NULL, dst_port); + tunnel = tb_find_tunnel(tb, TB_TUNNEL_DMA, NULL, dst_port); + tb_deactivate_and_free_tunnel(tunnel); } static int tb_disconnect_xdomain_paths(struct tb *tb, struct tb_xdomain *xd) @@ -493,7 +1123,7 @@ static int tb_disconnect_xdomain_paths(struct tb *tb, struct tb_xdomain *xd) /* hotplug handling */ -/** +/* * tb_handle_hotplug() - handle hotplug event * * Executes on tb->wq. @@ -505,6 +1135,10 @@ static void tb_handle_hotplug(struct work_struct *work) struct tb_cm *tcm = tb_priv(tb); struct tb_switch *sw; struct tb_port *port; + + /* Bring the domain back from sleep if it was suspended */ + pm_runtime_get_sync(&tb->dev); + mutex_lock(&tb->lock); if (!tcm->hotplug_active) goto out; /* during init, suspend or shutdown */ @@ -528,15 +1162,26 @@ static void tb_handle_hotplug(struct work_struct *work) ev->route, ev->port, ev->unplug); goto put_sw; } + + pm_runtime_get_sync(&sw->dev); + if (ev->unplug) { + tb_retimer_remove_all(port); + if (tb_port_has_remote(port)) { tb_port_dbg(port, "switch unplugged\n"); tb_sw_set_unplugged(port->remote->sw); tb_free_invalid_tunnels(tb); + 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_remove(port->remote->sw); port->remote = NULL; if (port->dual_link_port) port->dual_link_port->remote = NULL; + /* Maybe we can create another DP tunnel */ + tb_tunnel_dp(tb); } else if (port->xdomain) { struct tb_xdomain *xd = tb_xdomain_get(port->xdomain); @@ -553,8 +1198,9 @@ static void tb_handle_hotplug(struct work_struct *work) port->xdomain = NULL; __tb_disconnect_xdomain_paths(tb, xd); tb_xdomain_put(xd); - } else if (tb_port_is_dpout(port)) { - tb_teardown_dp(tb, port); + tb_port_unconfigure_xdomain(port); + } else if (tb_port_is_dpout(port) || tb_port_is_dpin(port)) { + tb_dp_resource_unavailable(tb, port); } else { tb_port_dbg(port, "got unplug event for disconnected port, ignoring\n"); @@ -567,19 +1213,26 @@ static void tb_handle_hotplug(struct work_struct *work) tb_scan_port(port); if (!port->remote) tb_port_dbg(port, "hotplug: no switch found\n"); - } else if (tb_port_is_dpout(port)) { - tb_tunnel_dp(tb, port); + } else if (tb_port_is_dpout(port) || tb_port_is_dpin(port)) { + tb_dp_resource_available(tb, port); } } + pm_runtime_mark_last_busy(&sw->dev); + pm_runtime_put_autosuspend(&sw->dev); + put_sw: tb_switch_put(sw); out: mutex_unlock(&tb->lock); + + pm_runtime_mark_last_busy(&tb->dev); + pm_runtime_put_autosuspend(&tb->dev); + kfree(ev); } -/** +/* * tb_schedule_hotplug_handler() - callback function for the control channel * * Delegates to tb_handle_hotplug. @@ -597,8 +1250,7 @@ static void tb_handle_event(struct tb *tb, enum tb_cfg_pkg_type type, route = tb_cfg_get_route(&pkg->header); - if (tb_cfg_error(tb->ctl, route, pkg->port, - TB_CFG_ERROR_ACK_PLUG_EVENT)) { + if (tb_cfg_ack_plug(tb->ctl, route, pkg->port, pkg->unplug)) { tb_warn(tb, "could not ack plug event on %llx:%x\n", route, pkg->port); } @@ -612,6 +1264,7 @@ static void tb_stop(struct tb *tb) struct tb_tunnel *tunnel; struct tb_tunnel *n; + cancel_delayed_work(&tcm->remove_work); /* tunnels are only present after everything has been initialized */ list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) { /* @@ -663,6 +1316,8 @@ static int tb_start(struct tb *tb) * root switch. */ tb->root_switch->no_nvm_upgrade = true; + /* All USB4 routers support runtime PM */ + tb->root_switch->rpm = tb_switch_is_usb4(tb->root_switch); ret = tb_switch_configure(tb->root_switch); if (ret) { @@ -677,10 +1332,19 @@ static int tb_start(struct tb *tb) return ret; } + /* Enable TMU if it is off */ + tb_switch_tmu_enable(tb->root_switch); /* Full scan to discover devices added before the driver was loaded. */ tb_scan_switch(tb->root_switch); /* Find out tunnels created by the boot firmware */ tb_discover_tunnels(tb->root_switch); + /* + * If the boot firmware did not create USB 3.x tunnels create them + * now for the whole topology. + */ + tb_create_usb3_tunnels(tb->root_switch); + /* Add DP IN resources for the root switch */ + tb_add_dp_resources(tb->root_switch); /* Make the discovered switches available to the userspace */ device_for_each_child(&tb->root_switch->dev, NULL, tb_scan_finalize_switch); @@ -695,13 +1359,40 @@ static int tb_suspend_noirq(struct tb *tb) struct tb_cm *tcm = tb_priv(tb); tb_dbg(tb, "suspending...\n"); - tb_switch_suspend(tb->root_switch); + tb_disconnect_and_release_dp(tb); + tb_switch_suspend(tb->root_switch, false); tcm->hotplug_active = false; /* signal tb_handle_hotplug to quit */ tb_dbg(tb, "suspend finished\n"); return 0; } +static void tb_restore_children(struct tb_switch *sw) +{ + struct tb_port *port; + + /* No need to restore if the router is already unplugged */ + if (sw->is_unplugged) + return; + + if (tb_enable_tmu(sw)) + tb_sw_warn(sw, "failed to restore TMU configuration\n"); + + tb_switch_for_each_port(sw, port) { + if (!tb_port_has_remote(port) && !port->xdomain) + continue; + + if (port->remote) { + tb_switch_lane_bonding_enable(port->remote->sw); + tb_switch_configure_link(port->remote->sw); + + tb_restore_children(port->remote->sw); + } else if (port->xdomain) { + tb_port_configure_xdomain(port); + } + } +} + static int tb_resume_noirq(struct tb *tb) { struct tb_cm *tcm = tb_priv(tb); @@ -710,11 +1401,12 @@ static int tb_resume_noirq(struct tb *tb) tb_dbg(tb, "resuming...\n"); /* remove any pci devices the firmware might have setup */ - tb_switch_reset(tb, 0); + tb_switch_reset(tb->root_switch); tb_switch_resume(tb->root_switch); tb_free_invalid_tunnels(tb); tb_free_unplugged_children(tb->root_switch); + tb_restore_children(tb->root_switch); list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) tb_tunnel_restart(tunnel); if (!list_empty(&tcm->tunnel_list)) { @@ -734,15 +1426,16 @@ static int tb_resume_noirq(struct tb *tb) static int tb_free_unplugged_xdomains(struct tb_switch *sw) { - int i, ret = 0; - - for (i = 1; i <= sw->config.max_port_number; i++) { - struct tb_port *port = &sw->ports[i]; + struct tb_port *port; + int ret = 0; + tb_switch_for_each_port(sw, port) { if (tb_is_upstream_port(port)) continue; if (port->xdomain && port->xdomain->is_unplugged) { + tb_retimer_remove_all(port); tb_xdomain_remove(port->xdomain); + tb_port_unconfigure_xdomain(port); port->xdomain = NULL; ret++; } else if (port->remote) { @@ -753,6 +1446,22 @@ static int tb_free_unplugged_xdomains(struct tb_switch *sw) return ret; } +static int tb_freeze_noirq(struct tb *tb) +{ + struct tb_cm *tcm = tb_priv(tb); + + tcm->hotplug_active = false; + return 0; +} + +static int tb_thaw_noirq(struct tb *tb) +{ + struct tb_cm *tcm = tb_priv(tb); + + tcm->hotplug_active = true; + return 0; +} + static void tb_complete(struct tb *tb) { /* @@ -766,13 +1475,66 @@ static void tb_complete(struct tb *tb) mutex_unlock(&tb->lock); } +static int tb_runtime_suspend(struct tb *tb) +{ + struct tb_cm *tcm = tb_priv(tb); + + mutex_lock(&tb->lock); + tb_switch_suspend(tb->root_switch, true); + tcm->hotplug_active = false; + mutex_unlock(&tb->lock); + + return 0; +} + +static void tb_remove_work(struct work_struct *work) +{ + struct tb_cm *tcm = container_of(work, struct tb_cm, remove_work.work); + struct tb *tb = tcm_to_tb(tcm); + + mutex_lock(&tb->lock); + if (tb->root_switch) { + tb_free_unplugged_children(tb->root_switch); + tb_free_unplugged_xdomains(tb->root_switch); + } + mutex_unlock(&tb->lock); +} + +static int tb_runtime_resume(struct tb *tb) +{ + struct tb_cm *tcm = tb_priv(tb); + struct tb_tunnel *tunnel, *n; + + mutex_lock(&tb->lock); + tb_switch_resume(tb->root_switch); + tb_free_invalid_tunnels(tb); + tb_restore_children(tb->root_switch); + list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) + tb_tunnel_restart(tunnel); + tcm->hotplug_active = true; + mutex_unlock(&tb->lock); + + /* + * Schedule cleanup of any unplugged devices. Run this in a + * separate thread to avoid possible deadlock if the device + * removal runtime resumes the unplugged device. + */ + queue_delayed_work(tb->wq, &tcm->remove_work, msecs_to_jiffies(50)); + return 0; +} + static const struct tb_cm_ops tb_cm_ops = { .start = tb_start, .stop = tb_stop, .suspend_noirq = tb_suspend_noirq, .resume_noirq = tb_resume_noirq, + .freeze_noirq = tb_freeze_noirq, + .thaw_noirq = tb_thaw_noirq, .complete = tb_complete, + .runtime_suspend = tb_runtime_suspend, + .runtime_resume = tb_runtime_resume, .handle_event = tb_handle_event, + .disapprove_switch = tb_disconnect_pci, .approve_switch = tb_tunnel_pci, .approve_xdomain_paths = tb_approve_xdomain_paths, .disconnect_xdomain_paths = tb_disconnect_xdomain_paths, @@ -783,9 +1545,6 @@ struct tb *tb_probe(struct tb_nhi *nhi) struct tb_cm *tcm; struct tb *tb; - if (!x86_apple_machine) - return NULL; - tb = tb_domain_alloc(nhi, sizeof(*tcm)); if (!tb) return NULL; @@ -795,6 +1554,10 @@ struct tb *tb_probe(struct tb_nhi *nhi) tcm = tb_priv(tb); INIT_LIST_HEAD(&tcm->tunnel_list); + INIT_LIST_HEAD(&tcm->dp_resources); + INIT_DELAYED_WORK(&tcm->remove_work, tb_remove_work); + + tb_dbg(tb, "using software connection manager\n"); return tb; } |