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1665 lines
40 KiB
1665 lines
40 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Thunderbolt driver - bus logic (NHI independent) |
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* |
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* Copyright (c) 2014 Andreas Noever <[email protected]> |
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* Copyright (C) 2019, Intel Corporation |
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*/ |
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|
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#include <linux/slab.h> |
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#include <linux/errno.h> |
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#include <linux/delay.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/platform_data/x86/apple.h> |
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|
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#include "tb.h" |
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#include "tb_regs.h" |
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#include "tunnel.h" |
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|
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#define TB_TIMEOUT 100 /* ms */ |
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|
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/** |
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* struct tb_cm - Simple Thunderbolt connection manager |
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* @tunnel_list: List of active tunnels |
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* @dp_resources: List of available DP resources for DP tunneling |
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* @hotplug_active: tb_handle_hotplug will stop progressing plug |
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* events and exit if this is not set (it needs to |
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* acquire the lock one more time). Used to drain wq |
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* after cfg has been paused. |
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* @remove_work: Work used to remove any unplugged routers after |
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* runtime resume |
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*/ |
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struct tb_cm { |
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struct list_head tunnel_list; |
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struct list_head dp_resources; |
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bool hotplug_active; |
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struct delayed_work remove_work; |
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}; |
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|
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static inline struct tb *tcm_to_tb(struct tb_cm *tcm) |
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{ |
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return ((void *)tcm - sizeof(struct tb)); |
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} |
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|
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struct tb_hotplug_event { |
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struct work_struct work; |
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struct tb *tb; |
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u64 route; |
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u8 port; |
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bool unplug; |
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}; |
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|
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static void tb_handle_hotplug(struct work_struct *work); |
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|
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static void tb_queue_hotplug(struct tb *tb, u64 route, u8 port, bool unplug) |
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{ |
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struct tb_hotplug_event *ev; |
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|
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ev = kmalloc(sizeof(*ev), GFP_KERNEL); |
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if (!ev) |
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return; |
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|
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ev->tb = tb; |
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ev->route = route; |
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ev->port = port; |
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ev->unplug = unplug; |
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INIT_WORK(&ev->work, tb_handle_hotplug); |
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queue_work(tb->wq, &ev->work); |
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} |
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|
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/* enumeration & hot plug handling */ |
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|
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static void tb_add_dp_resources(struct tb_switch *sw) |
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{ |
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struct tb_cm *tcm = tb_priv(sw->tb); |
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struct tb_port *port; |
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|
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tb_switch_for_each_port(sw, port) { |
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if (!tb_port_is_dpin(port)) |
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continue; |
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|
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if (!tb_switch_query_dp_resource(sw, port)) |
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continue; |
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|
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list_add_tail(&port->list, &tcm->dp_resources); |
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tb_port_dbg(port, "DP IN resource available\n"); |
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} |
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} |
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|
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static void tb_remove_dp_resources(struct tb_switch *sw) |
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{ |
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struct tb_cm *tcm = tb_priv(sw->tb); |
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struct tb_port *port, *tmp; |
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|
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/* Clear children resources first */ |
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tb_switch_for_each_port(sw, port) { |
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if (tb_port_has_remote(port)) |
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tb_remove_dp_resources(port->remote->sw); |
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} |
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|
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list_for_each_entry_safe(port, tmp, &tcm->dp_resources, list) { |
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if (port->sw == sw) { |
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tb_port_dbg(port, "DP OUT resource unavailable\n"); |
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list_del_init(&port->list); |
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} |
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} |
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} |
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|
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static void tb_discover_tunnels(struct tb_switch *sw) |
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{ |
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struct tb *tb = sw->tb; |
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struct tb_cm *tcm = tb_priv(tb); |
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struct tb_port *port; |
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|
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tb_switch_for_each_port(sw, port) { |
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struct tb_tunnel *tunnel = NULL; |
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|
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switch (port->config.type) { |
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case TB_TYPE_DP_HDMI_IN: |
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tunnel = tb_tunnel_discover_dp(tb, port); |
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break; |
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|
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case TB_TYPE_PCIE_DOWN: |
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tunnel = tb_tunnel_discover_pci(tb, port); |
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break; |
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|
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case TB_TYPE_USB3_DOWN: |
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tunnel = tb_tunnel_discover_usb3(tb, port); |
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break; |
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|
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default: |
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break; |
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} |
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|
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if (!tunnel) |
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continue; |
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|
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if (tb_tunnel_is_pci(tunnel)) { |
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struct tb_switch *parent = tunnel->dst_port->sw; |
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|
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while (parent != tunnel->src_port->sw) { |
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parent->boot = true; |
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parent = tb_switch_parent(parent); |
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} |
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} else if (tb_tunnel_is_dp(tunnel)) { |
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/* Keep the domain from powering down */ |
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pm_runtime_get_sync(&tunnel->src_port->sw->dev); |
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pm_runtime_get_sync(&tunnel->dst_port->sw->dev); |
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} |
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|
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list_add_tail(&tunnel->list, &tcm->tunnel_list); |
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} |
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|
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tb_switch_for_each_port(sw, port) { |
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if (tb_port_has_remote(port)) |
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tb_discover_tunnels(port->remote->sw); |
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} |
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} |
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|
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static int tb_port_configure_xdomain(struct tb_port *port) |
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{ |
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/* |
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* XDomain paths currently only support single lane so we must |
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* disable the other lane according to USB4 spec. |
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*/ |
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tb_port_disable(port->dual_link_port); |
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|
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if (tb_switch_is_usb4(port->sw)) |
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return usb4_port_configure_xdomain(port); |
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return tb_lc_configure_xdomain(port); |
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} |
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|
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static void tb_port_unconfigure_xdomain(struct tb_port *port) |
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{ |
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if (tb_switch_is_usb4(port->sw)) |
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usb4_port_unconfigure_xdomain(port); |
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else |
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tb_lc_unconfigure_xdomain(port); |
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|
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tb_port_enable(port->dual_link_port); |
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} |
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|
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static void tb_scan_xdomain(struct tb_port *port) |
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{ |
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struct tb_switch *sw = port->sw; |
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struct tb *tb = sw->tb; |
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struct tb_xdomain *xd; |
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u64 route; |
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|
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if (!tb_is_xdomain_enabled()) |
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return; |
|
|
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route = tb_downstream_route(port); |
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xd = tb_xdomain_find_by_route(tb, route); |
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if (xd) { |
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tb_xdomain_put(xd); |
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return; |
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} |
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|
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xd = tb_xdomain_alloc(tb, &sw->dev, route, tb->root_switch->uuid, |
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NULL); |
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if (xd) { |
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tb_port_at(route, sw)->xdomain = xd; |
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tb_port_configure_xdomain(port); |
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tb_xdomain_add(xd); |
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} |
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} |
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|
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static int tb_enable_tmu(struct tb_switch *sw) |
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{ |
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int ret; |
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|
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/* If it is already enabled in correct mode, don't touch it */ |
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if (tb_switch_tmu_is_enabled(sw)) |
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return 0; |
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|
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ret = tb_switch_tmu_disable(sw); |
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if (ret) |
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return ret; |
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|
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ret = tb_switch_tmu_post_time(sw); |
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if (ret) |
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return ret; |
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|
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return tb_switch_tmu_enable(sw); |
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} |
|
|
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/** |
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* tb_find_unused_port() - return the first inactive port on @sw |
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* @sw: Switch to find the port on |
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* @type: Port type to look for |
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*/ |
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static struct tb_port *tb_find_unused_port(struct tb_switch *sw, |
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enum tb_port_type type) |
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{ |
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struct tb_port *port; |
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|
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tb_switch_for_each_port(sw, port) { |
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if (tb_is_upstream_port(port)) |
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continue; |
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if (port->config.type != type) |
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continue; |
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if (!port->cap_adap) |
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continue; |
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if (tb_port_is_enabled(port)) |
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continue; |
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return port; |
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} |
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return NULL; |
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} |
|
|
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static struct tb_port *tb_find_usb3_down(struct tb_switch *sw, |
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const struct tb_port *port) |
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{ |
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struct tb_port *down; |
|
|
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down = usb4_switch_map_usb3_down(sw, port); |
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if (down && !tb_usb3_port_is_enabled(down)) |
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return down; |
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return NULL; |
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} |
|
|
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static struct tb_tunnel *tb_find_tunnel(struct tb *tb, enum tb_tunnel_type type, |
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struct tb_port *src_port, |
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struct tb_port *dst_port) |
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{ |
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struct tb_cm *tcm = tb_priv(tb); |
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struct tb_tunnel *tunnel; |
|
|
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list_for_each_entry(tunnel, &tcm->tunnel_list, list) { |
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if (tunnel->type == type && |
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((src_port && src_port == tunnel->src_port) || |
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(dst_port && dst_port == tunnel->dst_port))) { |
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return tunnel; |
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} |
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} |
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|
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return NULL; |
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} |
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|
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static struct tb_tunnel *tb_find_first_usb3_tunnel(struct tb *tb, |
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struct tb_port *src_port, |
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struct tb_port *dst_port) |
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{ |
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struct tb_port *port, *usb3_down; |
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struct tb_switch *sw; |
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|
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/* Pick the router that is deepest in the topology */ |
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if (dst_port->sw->config.depth > src_port->sw->config.depth) |
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sw = dst_port->sw; |
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else |
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sw = src_port->sw; |
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|
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/* Can't be the host router */ |
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if (sw == tb->root_switch) |
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return NULL; |
|
|
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/* Find the downstream USB4 port that leads to this router */ |
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port = tb_port_at(tb_route(sw), tb->root_switch); |
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/* Find the corresponding host router USB3 downstream port */ |
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usb3_down = usb4_switch_map_usb3_down(tb->root_switch, port); |
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if (!usb3_down) |
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return NULL; |
|
|
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return tb_find_tunnel(tb, TB_TUNNEL_USB3, usb3_down, NULL); |
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} |
|
|
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static int tb_available_bandwidth(struct tb *tb, struct tb_port *src_port, |
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struct tb_port *dst_port, int *available_up, int *available_down) |
|
{ |
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int usb3_consumed_up, usb3_consumed_down, ret; |
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struct tb_cm *tcm = tb_priv(tb); |
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struct tb_tunnel *tunnel; |
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struct tb_port *port; |
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|
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tb_port_dbg(dst_port, "calculating available bandwidth\n"); |
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|
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tunnel = tb_find_first_usb3_tunnel(tb, src_port, dst_port); |
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if (tunnel) { |
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ret = tb_tunnel_consumed_bandwidth(tunnel, &usb3_consumed_up, |
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&usb3_consumed_down); |
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if (ret) |
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return ret; |
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} else { |
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usb3_consumed_up = 0; |
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usb3_consumed_down = 0; |
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} |
|
|
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*available_up = *available_down = 40000; |
|
|
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/* Find the minimum available bandwidth over all links */ |
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tb_for_each_port_on_path(src_port, dst_port, port) { |
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int link_speed, link_width, up_bw, down_bw; |
|
|
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if (!tb_port_is_null(port)) |
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continue; |
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|
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if (tb_is_upstream_port(port)) { |
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link_speed = port->sw->link_speed; |
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} else { |
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link_speed = tb_port_get_link_speed(port); |
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if (link_speed < 0) |
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return link_speed; |
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} |
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|
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link_width = port->bonded ? 2 : 1; |
|
|
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up_bw = link_speed * link_width * 1000; /* Mb/s */ |
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/* Leave 10% guard band */ |
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up_bw -= up_bw / 10; |
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down_bw = up_bw; |
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|
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tb_port_dbg(port, "link total bandwidth %d Mb/s\n", up_bw); |
|
|
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/* |
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* Find all DP tunnels that cross the port and reduce |
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* their consumed bandwidth from the available. |
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*/ |
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list_for_each_entry(tunnel, &tcm->tunnel_list, list) { |
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int dp_consumed_up, dp_consumed_down; |
|
|
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if (!tb_tunnel_is_dp(tunnel)) |
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continue; |
|
|
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if (!tb_tunnel_port_on_path(tunnel, port)) |
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continue; |
|
|
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ret = tb_tunnel_consumed_bandwidth(tunnel, |
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&dp_consumed_up, |
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&dp_consumed_down); |
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if (ret) |
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return ret; |
|
|
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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; |
|
|
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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; |
|
|
|
if (!tb_acpi_may_tunnel_usb3()) { |
|
tb_dbg(tb, "USB3 tunneling disabled, not creating tunnel\n"); |
|
return 0; |
|
} |
|
|
|
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_acpi_may_tunnel_usb3()) |
|
return 0; |
|
|
|
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) |
|
{ |
|
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) |
|
{ |
|
struct tb_cm *tcm = tb_priv(port->sw->tb); |
|
struct tb_port *upstream_port; |
|
struct tb_switch *sw; |
|
|
|
if (tb_is_upstream_port(port)) |
|
return; |
|
|
|
if (tb_port_is_dpout(port) && tb_dp_port_hpd_is_active(port) == 1 && |
|
!tb_dp_port_is_enabled(port)) { |
|
tb_port_dbg(port, "DP adapter HPD set, queuing hotplug\n"); |
|
tb_queue_hotplug(port->sw->tb, tb_route(port->sw), port->port, |
|
false); |
|
return; |
|
} |
|
|
|
if (port->config.type != TB_TYPE_PORT) |
|
return; |
|
if (port->dual_link_port && port->link_nr) |
|
return; /* |
|
* Downstream switch is reachable through two ports. |
|
* Only scan on the primary port (link_nr == 0). |
|
*/ |
|
if (tb_wait_for_port(port, false) <= 0) |
|
return; |
|
if (port->remote) { |
|
tb_port_dbg(port, "port already has a remote\n"); |
|
return; |
|
} |
|
|
|
tb_retimer_scan(port, true); |
|
|
|
sw = tb_switch_alloc(port->sw->tb, &port->sw->dev, |
|
tb_downstream_route(port)); |
|
if (IS_ERR(sw)) { |
|
/* |
|
* If there is an error accessing the connected switch |
|
* it may be connected to another domain. Also we allow |
|
* the other domain to be connected to a max depth switch. |
|
*/ |
|
if (PTR_ERR(sw) == -EIO || PTR_ERR(sw) == -EADDRNOTAVAIL) |
|
tb_scan_xdomain(port); |
|
return; |
|
} |
|
|
|
if (tb_switch_configure(sw)) { |
|
tb_switch_put(sw); |
|
return; |
|
} |
|
|
|
/* |
|
* If there was previously another domain connected remove it |
|
* first. |
|
*/ |
|
if (port->xdomain) { |
|
tb_xdomain_remove(port->xdomain); |
|
tb_port_unconfigure_xdomain(port); |
|
port->xdomain = NULL; |
|
} |
|
|
|
/* |
|
* Do not send uevents until we have discovered all existing |
|
* tunnels and know which switches were authorized already by |
|
* the boot firmware. |
|
*/ |
|
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; |
|
} |
|
|
|
/* 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; |
|
} |
|
|
|
/* 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, true); |
|
|
|
/* |
|
* 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 void tb_deactivate_and_free_tunnel(struct tb_tunnel *tunnel) |
|
{ |
|
struct tb_port *src_port, *dst_port; |
|
struct tb *tb; |
|
|
|
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; |
|
} |
|
|
|
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) |
|
{ |
|
struct tb_cm *tcm = tb_priv(tb); |
|
struct tb_tunnel *tunnel; |
|
struct tb_tunnel *n; |
|
|
|
list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) { |
|
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) |
|
{ |
|
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) |
|
port->dual_link_port->remote = NULL; |
|
} else { |
|
tb_free_unplugged_children(port->remote->sw); |
|
} |
|
} |
|
} |
|
|
|
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 switch downstream PCIe ports. |
|
*/ |
|
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; |
|
|
|
/* |
|
* Hard-coded Thunderbolt port to PCIe down port mapping |
|
* per controller. |
|
*/ |
|
if (tb_switch_is_cactus_ridge(sw) || |
|
tb_switch_is_alpine_ridge(sw)) |
|
index = !phy_port ? 6 : 7; |
|
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; |
|
|
|
down = &sw->ports[index]; |
|
} |
|
|
|
if (down) { |
|
if (WARN_ON(!tb_port_is_pcie_down(down))) |
|
goto out; |
|
if (tb_pci_port_is_enabled(down)) |
|
goto out; |
|
|
|
return down; |
|
} |
|
|
|
out: |
|
return tb_find_unused_port(sw, TB_TYPE_PCIE_DOWN); |
|
} |
|
|
|
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_port *port, *in, *out; |
|
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. |
|
*/ |
|
tb_dbg(tb, "looking for DP IN <-> DP OUT pairs:\n"); |
|
|
|
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, available_up, available_down); |
|
if (!tunnel) { |
|
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"); |
|
goto err_free; |
|
} |
|
|
|
list_add_tail(&tunnel->list, &tcm->tunnel_list); |
|
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 int tb_disconnect_pci(struct tb *tb, struct tb_switch *sw) |
|
{ |
|
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) |
|
{ |
|
struct tb_port *up, *down, *port; |
|
struct tb_cm *tcm = tb_priv(tb); |
|
struct tb_switch *parent_sw; |
|
struct tb_tunnel *tunnel; |
|
|
|
up = tb_switch_find_port(sw, TB_TYPE_PCIE_UP); |
|
if (!up) |
|
return 0; |
|
|
|
/* |
|
* Look up available down port. Since we are chaining it should |
|
* be found right above this switch. |
|
*/ |
|
parent_sw = tb_to_switch(sw->dev.parent); |
|
port = tb_port_at(tb_route(sw), parent_sw); |
|
down = tb_find_pcie_down(parent_sw, port); |
|
if (!down) |
|
return 0; |
|
|
|
tunnel = tb_tunnel_alloc_pci(tb, up, down); |
|
if (!tunnel) |
|
return -ENOMEM; |
|
|
|
if (tb_tunnel_activate(tunnel)) { |
|
tb_port_info(up, |
|
"PCIe tunnel activation failed, aborting\n"); |
|
tb_tunnel_free(tunnel); |
|
return -EIO; |
|
} |
|
|
|
list_add_tail(&tunnel->list, &tcm->tunnel_list); |
|
return 0; |
|
} |
|
|
|
static int tb_approve_xdomain_paths(struct tb *tb, struct tb_xdomain *xd, |
|
int transmit_path, int transmit_ring, |
|
int receive_path, int receive_ring) |
|
{ |
|
struct tb_cm *tcm = tb_priv(tb); |
|
struct tb_port *nhi_port, *dst_port; |
|
struct tb_tunnel *tunnel; |
|
struct tb_switch *sw; |
|
|
|
sw = tb_to_switch(xd->dev.parent); |
|
dst_port = tb_port_at(xd->route, sw); |
|
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, transmit_path, |
|
transmit_ring, receive_path, receive_ring); |
|
if (!tunnel) { |
|
mutex_unlock(&tb->lock); |
|
return -ENOMEM; |
|
} |
|
|
|
if (tb_tunnel_activate(tunnel)) { |
|
tb_port_info(nhi_port, |
|
"DMA tunnel activation failed, aborting\n"); |
|
tb_tunnel_free(tunnel); |
|
mutex_unlock(&tb->lock); |
|
return -EIO; |
|
} |
|
|
|
list_add_tail(&tunnel->list, &tcm->tunnel_list); |
|
mutex_unlock(&tb->lock); |
|
return 0; |
|
} |
|
|
|
static void __tb_disconnect_xdomain_paths(struct tb *tb, struct tb_xdomain *xd, |
|
int transmit_path, int transmit_ring, |
|
int receive_path, int receive_ring) |
|
{ |
|
struct tb_cm *tcm = tb_priv(tb); |
|
struct tb_port *nhi_port, *dst_port; |
|
struct tb_tunnel *tunnel, *n; |
|
struct tb_switch *sw; |
|
|
|
sw = tb_to_switch(xd->dev.parent); |
|
dst_port = tb_port_at(xd->route, sw); |
|
nhi_port = tb_switch_find_port(tb->root_switch, TB_TYPE_NHI); |
|
|
|
list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) { |
|
if (!tb_tunnel_is_dma(tunnel)) |
|
continue; |
|
if (tunnel->src_port != nhi_port || tunnel->dst_port != dst_port) |
|
continue; |
|
|
|
if (tb_tunnel_match_dma(tunnel, transmit_path, transmit_ring, |
|
receive_path, receive_ring)) |
|
tb_deactivate_and_free_tunnel(tunnel); |
|
} |
|
} |
|
|
|
static int tb_disconnect_xdomain_paths(struct tb *tb, struct tb_xdomain *xd, |
|
int transmit_path, int transmit_ring, |
|
int receive_path, int receive_ring) |
|
{ |
|
if (!xd->is_unplugged) { |
|
mutex_lock(&tb->lock); |
|
__tb_disconnect_xdomain_paths(tb, xd, transmit_path, |
|
transmit_ring, receive_path, |
|
receive_ring); |
|
mutex_unlock(&tb->lock); |
|
} |
|
return 0; |
|
} |
|
|
|
/* hotplug handling */ |
|
|
|
/* |
|
* tb_handle_hotplug() - handle hotplug event |
|
* |
|
* Executes on tb->wq. |
|
*/ |
|
static void tb_handle_hotplug(struct work_struct *work) |
|
{ |
|
struct tb_hotplug_event *ev = container_of(work, typeof(*ev), work); |
|
struct tb *tb = ev->tb; |
|
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 */ |
|
|
|
sw = tb_switch_find_by_route(tb, ev->route); |
|
if (!sw) { |
|
tb_warn(tb, |
|
"hotplug event from non existent switch %llx:%x (unplug: %d)\n", |
|
ev->route, ev->port, ev->unplug); |
|
goto out; |
|
} |
|
if (ev->port > sw->config.max_port_number) { |
|
tb_warn(tb, |
|
"hotplug event from non existent port %llx:%x (unplug: %d)\n", |
|
ev->route, ev->port, ev->unplug); |
|
goto put_sw; |
|
} |
|
port = &sw->ports[ev->port]; |
|
if (tb_is_upstream_port(port)) { |
|
tb_dbg(tb, "hotplug event for upstream port %llx:%x (unplug: %d)\n", |
|
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); |
|
|
|
tb_port_dbg(port, "xdomain unplugged\n"); |
|
/* |
|
* Service drivers are unbound during |
|
* tb_xdomain_remove() so setting XDomain as |
|
* unplugged here prevents deadlock if they call |
|
* tb_xdomain_disable_paths(). We will tear down |
|
* all the tunnels below. |
|
*/ |
|
xd->is_unplugged = true; |
|
tb_xdomain_remove(xd); |
|
port->xdomain = NULL; |
|
__tb_disconnect_xdomain_paths(tb, xd, -1, -1, -1, -1); |
|
tb_xdomain_put(xd); |
|
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"); |
|
} |
|
} else if (port->remote) { |
|
tb_port_dbg(port, "got plug event for connected port, ignoring\n"); |
|
} else { |
|
if (tb_port_is_null(port)) { |
|
tb_port_dbg(port, "hotplug: scanning\n"); |
|
tb_scan_port(port); |
|
if (!port->remote) |
|
tb_port_dbg(port, "hotplug: no switch found\n"); |
|
} 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. |
|
*/ |
|
static void tb_handle_event(struct tb *tb, enum tb_cfg_pkg_type type, |
|
const void *buf, size_t size) |
|
{ |
|
const struct cfg_event_pkg *pkg = buf; |
|
u64 route; |
|
|
|
if (type != TB_CFG_PKG_EVENT) { |
|
tb_warn(tb, "unexpected event %#x, ignoring\n", type); |
|
return; |
|
} |
|
|
|
route = tb_cfg_get_route(&pkg->header); |
|
|
|
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); |
|
} |
|
|
|
tb_queue_hotplug(tb, route, pkg->port, pkg->unplug); |
|
} |
|
|
|
static void tb_stop(struct tb *tb) |
|
{ |
|
struct tb_cm *tcm = tb_priv(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) { |
|
/* |
|
* DMA tunnels require the driver to be functional so we |
|
* tear them down. Other protocol tunnels can be left |
|
* intact. |
|
*/ |
|
if (tb_tunnel_is_dma(tunnel)) |
|
tb_tunnel_deactivate(tunnel); |
|
tb_tunnel_free(tunnel); |
|
} |
|
tb_switch_remove(tb->root_switch); |
|
tcm->hotplug_active = false; /* signal tb_handle_hotplug to quit */ |
|
} |
|
|
|
static int tb_scan_finalize_switch(struct device *dev, void *data) |
|
{ |
|
if (tb_is_switch(dev)) { |
|
struct tb_switch *sw = tb_to_switch(dev); |
|
|
|
/* |
|
* If we found that the switch was already setup by the |
|
* boot firmware, mark it as authorized now before we |
|
* send uevent to userspace. |
|
*/ |
|
if (sw->boot) |
|
sw->authorized = 1; |
|
|
|
dev_set_uevent_suppress(dev, false); |
|
kobject_uevent(&dev->kobj, KOBJ_ADD); |
|
device_for_each_child(dev, NULL, tb_scan_finalize_switch); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int tb_start(struct tb *tb) |
|
{ |
|
struct tb_cm *tcm = tb_priv(tb); |
|
int ret; |
|
|
|
tb->root_switch = tb_switch_alloc(tb, &tb->dev, 0); |
|
if (IS_ERR(tb->root_switch)) |
|
return PTR_ERR(tb->root_switch); |
|
|
|
/* |
|
* ICM firmware upgrade needs running firmware and in native |
|
* mode that is not available so disable firmware upgrade of the |
|
* 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) { |
|
tb_switch_put(tb->root_switch); |
|
return ret; |
|
} |
|
|
|
/* Announce the switch to the world */ |
|
ret = tb_switch_add(tb->root_switch); |
|
if (ret) { |
|
tb_switch_put(tb->root_switch); |
|
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); |
|
|
|
/* Allow tb_handle_hotplug to progress events */ |
|
tcm->hotplug_active = true; |
|
return 0; |
|
} |
|
|
|
static int tb_suspend_noirq(struct tb *tb) |
|
{ |
|
struct tb_cm *tcm = tb_priv(tb); |
|
|
|
tb_dbg(tb, "suspending...\n"); |
|
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); |
|
struct tb_tunnel *tunnel, *n; |
|
|
|
tb_dbg(tb, "resuming...\n"); |
|
|
|
/* remove any pci devices the firmware might have setup */ |
|
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)) { |
|
/* |
|
* the pcie links need some time to get going. |
|
* 100ms works for me... |
|
*/ |
|
tb_dbg(tb, "tunnels restarted, sleeping for 100ms\n"); |
|
msleep(100); |
|
} |
|
/* Allow tb_handle_hotplug to progress events */ |
|
tcm->hotplug_active = true; |
|
tb_dbg(tb, "resume finished\n"); |
|
|
|
return 0; |
|
} |
|
|
|
static int tb_free_unplugged_xdomains(struct tb_switch *sw) |
|
{ |
|
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) { |
|
ret += tb_free_unplugged_xdomains(port->remote->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) |
|
{ |
|
/* |
|
* Release any unplugged XDomains and if there is a case where |
|
* another domain is swapped in place of unplugged XDomain we |
|
* need to run another rescan. |
|
*/ |
|
mutex_lock(&tb->lock); |
|
if (tb_free_unplugged_xdomains(tb->root_switch)) |
|
tb_scan_switch(tb->root_switch); |
|
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, |
|
}; |
|
|
|
/* |
|
* During suspend the Thunderbolt controller is reset and all PCIe |
|
* tunnels are lost. The NHI driver will try to reestablish all tunnels |
|
* during resume. This adds device links between the tunneled PCIe |
|
* downstream ports and the NHI so that the device core will make sure |
|
* NHI is resumed first before the rest. |
|
*/ |
|
static void tb_apple_add_links(struct tb_nhi *nhi) |
|
{ |
|
struct pci_dev *upstream, *pdev; |
|
|
|
if (!x86_apple_machine) |
|
return; |
|
|
|
switch (nhi->pdev->device) { |
|
case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE: |
|
case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C: |
|
case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_NHI: |
|
case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_NHI: |
|
break; |
|
default: |
|
return; |
|
} |
|
|
|
upstream = pci_upstream_bridge(nhi->pdev); |
|
while (upstream) { |
|
if (!pci_is_pcie(upstream)) |
|
return; |
|
if (pci_pcie_type(upstream) == PCI_EXP_TYPE_UPSTREAM) |
|
break; |
|
upstream = pci_upstream_bridge(upstream); |
|
} |
|
|
|
if (!upstream) |
|
return; |
|
|
|
/* |
|
* For each hotplug downstream port, create add device link |
|
* back to NHI so that PCIe tunnels can be re-established after |
|
* sleep. |
|
*/ |
|
for_each_pci_bridge(pdev, upstream->subordinate) { |
|
const struct device_link *link; |
|
|
|
if (!pci_is_pcie(pdev)) |
|
continue; |
|
if (pci_pcie_type(pdev) != PCI_EXP_TYPE_DOWNSTREAM || |
|
!pdev->is_hotplug_bridge) |
|
continue; |
|
|
|
link = device_link_add(&pdev->dev, &nhi->pdev->dev, |
|
DL_FLAG_AUTOREMOVE_SUPPLIER | |
|
DL_FLAG_PM_RUNTIME); |
|
if (link) { |
|
dev_dbg(&nhi->pdev->dev, "created link from %s\n", |
|
dev_name(&pdev->dev)); |
|
} else { |
|
dev_warn(&nhi->pdev->dev, "device link creation from %s failed\n", |
|
dev_name(&pdev->dev)); |
|
} |
|
} |
|
} |
|
|
|
struct tb *tb_probe(struct tb_nhi *nhi) |
|
{ |
|
struct tb_cm *tcm; |
|
struct tb *tb; |
|
|
|
tb = tb_domain_alloc(nhi, TB_TIMEOUT, sizeof(*tcm)); |
|
if (!tb) |
|
return NULL; |
|
|
|
if (tb_acpi_may_tunnel_pcie()) |
|
tb->security_level = TB_SECURITY_USER; |
|
else |
|
tb->security_level = TB_SECURITY_NOPCIE; |
|
|
|
tb->cm_ops = &tb_cm_ops; |
|
|
|
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"); |
|
|
|
tb_apple_add_links(nhi); |
|
tb_acpi_add_links(nhi); |
|
|
|
return tb; |
|
}
|
|
|