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c6da62a219
ACPI 6.4 introduced a new _OSC capability used to negotiate whether the OS is supposed to use Software (native) or Firmware based Connection Manager. If the native support is granted then there are set of bits that enable/disable different tunnel types that the Software Connection Manager is allowed to tunnel. This adds support for this new USB4 _OSC accordingly. When PCIe tunneling is disabled then the driver switches security level to be "nopcie" following the security level 5 used in Firmware based Connection Manager. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Acked-by: Yehezkel Bernat <YehezkelShB@gmail.com>
1581 lines
37 KiB
C
1581 lines
37 KiB
C
// 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 <andreas.noever@gmail.com>
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* Copyright (C) 2019, Intel Corporation
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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 "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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* 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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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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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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static void tb_handle_hotplug(struct work_struct *work);
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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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ev = kmalloc(sizeof(*ev), GFP_KERNEL);
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if (!ev)
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return;
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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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/* enumeration & hot plug handling */
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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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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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if (!tb_switch_query_dp_resource(sw, port))
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continue;
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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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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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/* 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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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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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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tb_switch_for_each_port(sw, port) {
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struct tb_tunnel *tunnel = NULL;
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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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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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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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default:
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break;
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}
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if (!tunnel)
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continue;
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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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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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}
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list_add_tail(&tunnel->list, &tcm->tunnel_list);
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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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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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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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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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tb_port_enable(port->dual_link_port);
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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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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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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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static int tb_enable_tmu(struct tb_switch *sw)
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{
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int ret;
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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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ret = tb_switch_tmu_disable(sw);
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if (ret)
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return ret;
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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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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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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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return NULL;
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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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/* 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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/* 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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{
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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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tb_port_dbg(dst_port, "calculating available bandwidth\n");
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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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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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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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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;
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down_bw -= dp_consumed_down;
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}
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/*
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* If USB3 is tunneled from the host router down to the
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* branch leading to port we need to take USB3 consumed
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* bandwidth into account regardless whether it actually
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* crosses the port.
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*/
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up_bw -= usb3_consumed_up;
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down_bw -= usb3_consumed_down;
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if (up_bw < *available_up)
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*available_up = up_bw;
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if (down_bw < *available_down)
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*available_down = down_bw;
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}
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if (*available_up < 0)
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*available_up = 0;
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if (*available_down < 0)
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*available_down = 0;
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return 0;
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}
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static int tb_release_unused_usb3_bandwidth(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_tunnel *tunnel;
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tunnel = tb_find_first_usb3_tunnel(tb, src_port, dst_port);
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return tunnel ? tb_tunnel_release_unused_bandwidth(tunnel) : 0;
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}
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static void tb_reclaim_usb3_bandwidth(struct tb *tb, struct tb_port *src_port,
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struct tb_port *dst_port)
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{
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int ret, available_up, available_down;
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struct tb_tunnel *tunnel;
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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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return;
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tb_dbg(tb, "reclaiming unused bandwidth for USB3\n");
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/*
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* Calculate available bandwidth for the first hop USB3 tunnel.
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* That determines the whole USB3 bandwidth for this branch.
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*/
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ret = tb_available_bandwidth(tb, tunnel->src_port, tunnel->dst_port,
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&available_up, &available_down);
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if (ret) {
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tb_warn(tb, "failed to calculate available bandwidth\n");
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return;
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}
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tb_dbg(tb, "available bandwidth for USB3 %d/%d Mb/s\n",
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available_up, available_down);
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tb_tunnel_reclaim_available_bandwidth(tunnel, &available_up, &available_down);
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}
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static int tb_tunnel_usb3(struct tb *tb, struct tb_switch *sw)
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{
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struct tb_switch *parent = tb_switch_parent(sw);
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int ret, available_up, available_down;
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struct tb_port *up, *down, *port;
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struct tb_cm *tcm = tb_priv(tb);
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struct tb_tunnel *tunnel;
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if (!tb_acpi_may_tunnel_usb3()) {
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tb_dbg(tb, "USB3 tunneling disabled, not creating tunnel\n");
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return 0;
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}
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up = tb_switch_find_port(sw, TB_TYPE_USB3_UP);
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if (!up)
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return 0;
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if (!sw->link_usb4)
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return 0;
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/*
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* Look up available down port. Since we are chaining it should
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* be found right above this switch.
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*/
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port = tb_port_at(tb_route(sw), parent);
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down = tb_find_usb3_down(parent, port);
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if (!down)
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return 0;
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if (tb_route(parent)) {
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struct tb_port *parent_up;
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/*
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* Check first that the parent switch has its upstream USB3
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* port enabled. Otherwise the chain is not complete and
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* there is no point setting up a new tunnel.
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*/
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parent_up = tb_switch_find_port(parent, TB_TYPE_USB3_UP);
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if (!parent_up || !tb_port_is_enabled(parent_up))
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return 0;
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/* Make all unused bandwidth available for the new tunnel */
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ret = tb_release_unused_usb3_bandwidth(tb, down, up);
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if (ret)
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return ret;
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}
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ret = tb_available_bandwidth(tb, down, up, &available_up,
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&available_down);
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if (ret)
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goto err_reclaim;
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tb_port_dbg(up, "available bandwidth for new USB3 tunnel %d/%d Mb/s\n",
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available_up, available_down);
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tunnel = tb_tunnel_alloc_usb3(tb, up, down, available_up,
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available_down);
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if (!tunnel) {
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ret = -ENOMEM;
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goto err_reclaim;
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}
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if (tb_tunnel_activate(tunnel)) {
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tb_port_info(up,
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"USB3 tunnel activation failed, aborting\n");
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ret = -EIO;
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goto err_free;
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}
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list_add_tail(&tunnel->list, &tcm->tunnel_list);
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if (tb_route(parent))
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tb_reclaim_usb3_bandwidth(tb, down, up);
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return 0;
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err_free:
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tb_tunnel_free(tunnel);
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err_reclaim:
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if (tb_route(parent))
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tb_reclaim_usb3_bandwidth(tb, down, up);
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return ret;
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}
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|
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static int tb_create_usb3_tunnels(struct tb_switch *sw)
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|
{
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struct tb_port *port;
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int ret;
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|
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if (!tb_acpi_may_tunnel_usb3())
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return 0;
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|
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if (tb_route(sw)) {
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ret = tb_tunnel_usb3(sw->tb, sw);
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if (ret)
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return ret;
|
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}
|
|
|
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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);
|
|
|
|
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);
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
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, xd->transmit_ring,
|
|
xd->transmit_path, xd->receive_ring,
|
|
xd->receive_path);
|
|
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)
|
|
{
|
|
struct tb_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);
|
|
|
|
/*
|
|
* It is possible that the tunnel was already teared down (in
|
|
* case of cable disconnect) so it is fine if we cannot find it
|
|
* here anymore.
|
|
*/
|
|
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)
|
|
{
|
|
if (!xd->is_unplugged) {
|
|
mutex_lock(&tb->lock);
|
|
__tb_disconnect_xdomain_paths(tb, xd);
|
|
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
|
|
* the path below.
|
|
*/
|
|
xd->is_unplugged = true;
|
|
tb_xdomain_remove(xd);
|
|
port->xdomain = NULL;
|
|
__tb_disconnect_xdomain_paths(tb, xd);
|
|
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,
|
|
};
|
|
|
|
struct tb *tb_probe(struct tb_nhi *nhi)
|
|
{
|
|
struct tb_cm *tcm;
|
|
struct tb *tb;
|
|
|
|
tb = tb_domain_alloc(nhi, 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");
|
|
|
|
return tb;
|
|
}
|