forked from Minki/linux
e0258805d7
This makes it easier to figure out whether the driver is using firmware or software based connection manager implementation. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
1541 lines
37 KiB
C
1541 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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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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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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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) {
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if (!tb_port_has_remote(port))
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continue;
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ret = tb_create_usb3_tunnels(port->remote->sw);
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if (ret)
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return ret;
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}
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|
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return 0;
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}
|
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|
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static void tb_scan_port(struct tb_port *port);
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|
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/**
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* tb_scan_switch() - scan for and initialize downstream switches
|
|
*/
|
|
static void tb_scan_switch(struct tb_switch *sw)
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{
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struct tb_port *port;
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|
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pm_runtime_get_sync(&sw->dev);
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|
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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;
|
|
|
|
/*
|
|
* 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_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,
|
|
.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;
|
|
|
|
tb->security_level = TB_SECURITY_USER;
|
|
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;
|
|
}
|