Release 4.14 drivers/thunderbolt/tb.c
// SPDX-License-Identifier: GPL-2.0
/*
* Thunderbolt Cactus Ridge driver - bus logic (NHI independent)
*
* Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
*/
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/platform_data/x86/apple.h>
#include "tb.h"
#include "tb_regs.h"
#include "tunnel_pci.h"
/**
* struct tb_cm - Simple Thunderbolt connection manager
* @tunnel_list: List of active tunnels
* @hotplug_active: tb_handle_hotplug will stop progressing plug
* events and exit if this is not set (it needs to
* acquire the lock one more time). Used to drain wq
* after cfg has been paused.
*/
struct tb_cm {
struct list_head tunnel_list;
bool hotplug_active;
};
/* enumeration & hot plug handling */
static void tb_scan_port(struct tb_port *port);
/**
* tb_scan_switch() - scan for and initialize downstream switches
*/
static void tb_scan_switch(struct tb_switch *sw)
{
int i;
for (i = 1; i <= sw->config.max_port_number; i++)
tb_scan_port(&sw->ports[i]);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andreas Noever | 42 | 100.00% | 2 | 100.00% |
| Total | 42 | 100.00% | 2 | 100.00% |
/**
* tb_scan_port() - check for and initialize switches below port
*/
static void tb_scan_port(struct tb_port *port)
{
struct tb_switch *sw;
if (tb_is_upstream_port(port))
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_WARN(port, "port already has a remote!\n");
return;
}
sw = tb_switch_alloc(port->sw->tb, &port->sw->dev,
tb_downstream_route(port));
if (!sw)
return;
if (tb_switch_configure(sw)) {
tb_switch_put(sw);
return;
}
sw->authorized = true;
if (tb_switch_add(sw)) {
tb_switch_put(sw);
return;
}
port->remote = tb_upstream_port(sw);
tb_upstream_port(sw)->remote = port;
tb_scan_switch(sw);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andreas Noever | 120 | 73.62% | 2 | 50.00% |
| Mika Westerberg | 43 | 26.38% | 2 | 50.00% |
| Total | 163 | 100.00% | 4 | 100.00% |
/**
* 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_pci_tunnel *tunnel;
struct tb_pci_tunnel *n;
list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) {
if (tb_pci_is_invalid(tunnel)) {
tb_pci_deactivate(tunnel);
list_del(&tunnel->list);
tb_pci_free(tunnel);
}
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andreas Noever | 51 | 72.86% | 1 | 50.00% |
| Mika Westerberg | 19 | 27.14% | 1 | 50.00% |
| Total | 70 | 100.00% | 2 | 100.00% |
/**
* tb_free_unplugged_children() - traverse hierarchy and free unplugged switches
*/
static void tb_free_unplugged_children(struct tb_switch *sw)
{
int i;
for (i = 1; i <= sw->config.max_port_number; i++) {
struct tb_port *port = &sw->ports[i];
if (tb_is_upstream_port(port))
continue;
if (!port->remote)
continue;
if (port->remote->sw->is_unplugged) {
tb_switch_remove(port->remote->sw);
port->remote = NULL;
} else {
tb_free_unplugged_children(port->remote->sw);
}
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andreas Noever | 100 | 99.01% | 1 | 50.00% |
| Mika Westerberg | 1 | 0.99% | 1 | 50.00% |
| Total | 101 | 100.00% | 2 | 100.00% |
/**
* find_pci_up_port() - return the first PCIe up port on @sw or NULL
*/
static struct tb_port *tb_find_pci_up_port(struct tb_switch *sw)
{
int i;
for (i = 1; i <= sw->config.max_port_number; i++)
if (sw->ports[i].config.type == TB_TYPE_PCIE_UP)
return &sw->ports[i];
return NULL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andreas Noever | 60 | 100.00% | 1 | 100.00% |
| Total | 60 | 100.00% | 1 | 100.00% |
/**
* find_unused_down_port() - return the first inactive PCIe down port on @sw
*/
static struct tb_port *tb_find_unused_down_port(struct tb_switch *sw)
{
int i;
int cap;
int res;
int data;
for (i = 1; i <= sw->config.max_port_number; i++) {
if (tb_is_upstream_port(&sw->ports[i]))
continue;
if (sw->ports[i].config.type != TB_TYPE_PCIE_DOWN)
continue;
cap = tb_port_find_cap(&sw->ports[i], TB_PORT_CAP_ADAP);
if (cap < 0)
continue;
res = tb_port_read(&sw->ports[i], &data, TB_CFG_PORT, cap, 1);
if (res < 0)
continue;
if (data & 0x80000000)
continue;
return &sw->ports[i];
}
return NULL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andreas Noever | 141 | 97.92% | 2 | 66.67% |
| Mika Westerberg | 3 | 2.08% | 1 | 33.33% |
| Total | 144 | 100.00% | 3 | 100.00% |
/**
* tb_activate_pcie_devices() - scan for and activate PCIe devices
*
* This method is somewhat ad hoc. For now it only supports one device
* per port and only devices at depth 1.
*/
static void tb_activate_pcie_devices(struct tb *tb)
{
int i;
int cap;
u32 data;
struct tb_switch *sw;
struct tb_port *up_port;
struct tb_port *down_port;
struct tb_pci_tunnel *tunnel;
struct tb_cm *tcm = tb_priv(tb);
/* scan for pcie devices at depth 1*/
for (i = 1; i <= tb->root_switch->config.max_port_number; i++) {
if (tb_is_upstream_port(&tb->root_switch->ports[i]))
continue;
if (tb->root_switch->ports[i].config.type != TB_TYPE_PORT)
continue;
if (!tb->root_switch->ports[i].remote)
continue;
sw = tb->root_switch->ports[i].remote->sw;
up_port = tb_find_pci_up_port(sw);
if (!up_port) {
tb_sw_info(sw, "no PCIe devices found, aborting\n");
continue;
}
/* check whether port is already activated */
cap = tb_port_find_cap(up_port, TB_PORT_CAP_ADAP);
if (cap < 0)
continue;
if (tb_port_read(up_port, &data, TB_CFG_PORT, cap, 1))
continue;
if (data & 0x80000000) {
tb_port_info(up_port,
"PCIe port already activated, aborting\n");
continue;
}
down_port = tb_find_unused_down_port(tb->root_switch);
if (!down_port) {
tb_port_info(up_port,
"All PCIe down ports are occupied, aborting\n");
continue;
}
tunnel = tb_pci_alloc(tb, up_port, down_port);
if (!tunnel) {
tb_port_info(up_port,
"PCIe tunnel allocation failed, aborting\n");
continue;
}
if (tb_pci_activate(tunnel)) {
tb_port_info(up_port,
"PCIe tunnel activation failed, aborting\n");
tb_pci_free(tunnel);
}
list_add(&tunnel->list, &tcm->tunnel_list);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andreas Noever | 266 | 91.10% | 2 | 50.00% |
| Mika Westerberg | 26 | 8.90% | 2 | 50.00% |
| Total | 292 | 100.00% | 4 | 100.00% |
/* hotplug handling */
struct tb_hotplug_event {
struct work_struct work;
struct tb *tb;
u64 route;
u8 port;
bool unplug;
};
/**
* 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;
mutex_lock(&tb->lock);
if (!tcm->hotplug_active)
goto out; /* during init, suspend or shutdown */
sw = get_switch_at_route(tb->root_switch, 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 out;
}
port = &sw->ports[ev->port];
if (tb_is_upstream_port(port)) {
tb_warn(tb,
"hotplug event for upstream port %llx:%x (unplug: %d)\n",
ev->route, ev->port, ev->unplug);
goto out;
}
if (ev->unplug) {
if (port->remote) {
tb_port_info(port, "unplugged\n");
tb_sw_set_unplugged(port->remote->sw);
tb_free_invalid_tunnels(tb);
tb_switch_remove(port->remote->sw);
port->remote = NULL;
} else {
tb_port_info(port,
"got unplug event for disconnected port, ignoring\n");
}
} else if (port->remote) {
tb_port_info(port,
"got plug event for connected port, ignoring\n");
} else {
tb_port_info(port, "hotplug: scanning\n");
tb_scan_port(port);
if (!port->remote) {
tb_port_info(port, "hotplug: no switch found\n");
} else if (port->remote->sw->config.depth > 1) {
tb_sw_warn(port->remote->sw,
"hotplug: chaining not supported\n");
} else {
tb_sw_info(port->remote->sw,
"hotplug: activating pcie devices\n");
tb_activate_pcie_devices(tb);
}
}
out:
mutex_unlock(&tb->lock);
kfree(ev);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andreas Noever | 356 | 96.48% | 3 | 50.00% |
| Mika Westerberg | 12 | 3.25% | 2 | 33.33% |
| Lukas Wunner | 1 | 0.27% | 1 | 16.67% |
| Total | 369 | 100.00% | 6 | 100.00% |
/**
* 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;
struct tb_hotplug_event *ev;
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_error(tb->ctl, route, pkg->port,
TB_CFG_ERROR_ACK_PLUG_EVENT)) {
tb_warn(tb, "could not ack plug event on %llx:%x\n", route,
pkg->port);
}
ev = kmalloc(sizeof(*ev), GFP_KERNEL);
if (!ev)
return;
INIT_WORK(&ev->work, tb_handle_hotplug);
ev->tb = tb;
ev->route = route;
ev->port = pkg->port;
ev->unplug = pkg->unplug;
queue_work(tb->wq, &ev->work);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mika Westerberg | 88 | 52.38% | 1 | 50.00% |
| Andreas Noever | 80 | 47.62% | 1 | 50.00% |
| Total | 168 | 100.00% | 2 | 100.00% |
static void tb_stop(struct tb *tb)
{
struct tb_cm *tcm = tb_priv(tb);
struct tb_pci_tunnel *tunnel;
struct tb_pci_tunnel *n;
/* tunnels are only present after everything has been initialized */
list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) {
tb_pci_deactivate(tunnel);
tb_pci_free(tunnel);
}
tb_switch_remove(tb->root_switch);
tcm->hotplug_active = false; /* signal tb_handle_hotplug to quit */
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andreas Noever | 53 | 77.94% | 3 | 60.00% |
| Mika Westerberg | 15 | 22.06% | 2 | 40.00% |
| Total | 68 | 100.00% | 5 | 100.00% |
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 (!tb->root_switch)
return -ENOMEM;
/*
* 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;
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;
}
/* Full scan to discover devices added before the driver was loaded. */
tb_scan_switch(tb->root_switch);
tb_activate_pcie_devices(tb);
/* Allow tb_handle_hotplug to progress events */
tcm->hotplug_active = true;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mika Westerberg | 84 | 62.69% | 3 | 42.86% |
| Andreas Noever | 50 | 37.31% | 4 | 57.14% |
| Total | 134 | 100.00% | 7 | 100.00% |
static int tb_suspend_noirq(struct tb *tb)
{
struct tb_cm *tcm = tb_priv(tb);
tb_info(tb, "suspending...\n");
tb_switch_suspend(tb->root_switch);
tcm->hotplug_active = false; /* signal tb_handle_hotplug to quit */
tb_info(tb, "suspend finished\n");
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andreas Noever | 35 | 67.31% | 1 | 50.00% |
| Mika Westerberg | 17 | 32.69% | 1 | 50.00% |
| Total | 52 | 100.00% | 2 | 100.00% |
static int tb_resume_noirq(struct tb *tb)
{
struct tb_cm *tcm = tb_priv(tb);
struct tb_pci_tunnel *tunnel, *n;
tb_info(tb, "resuming...\n");
/* remove any pci devices the firmware might have setup */
tb_switch_reset(tb, 0);
tb_switch_resume(tb->root_switch);
tb_free_invalid_tunnels(tb);
tb_free_unplugged_children(tb->root_switch);
list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list)
tb_pci_restart(tunnel);
if (!list_empty(&tcm->tunnel_list)) {
/*
* the pcie links need some time to get going.
* 100ms works for me...
*/
tb_info(tb, "tunnels restarted, sleeping for 100ms\n");
msleep(100);
}
/* Allow tb_handle_hotplug to progress events */
tcm->hotplug_active = true;
tb_info(tb, "resume finished\n");
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andreas Noever | 98 | 80.99% | 1 | 50.00% |
| Mika Westerberg | 23 | 19.01% | 1 | 50.00% |
| Total | 121 | 100.00% | 2 | 100.00% |
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,
.handle_event = tb_handle_event,
};
struct tb *tb_probe(struct tb_nhi *nhi)
{
struct tb_cm *tcm;
struct tb *tb;
if (!x86_apple_machine)
return NULL;
tb = tb_domain_alloc(nhi, sizeof(*tcm));
if (!tb)
return NULL;
tb->security_level = TB_SECURITY_NONE;
tb->cm_ops = &tb_cm_ops;
tcm = tb_priv(tb);
INIT_LIST_HEAD(&tcm->tunnel_list);
return tb;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mika Westerberg | 76 | 92.68% | 2 | 50.00% |
| Andreas Noever | 5 | 6.10% | 1 | 25.00% |
| Lukas Wunner | 1 | 1.22% | 1 | 25.00% |
| Total | 82 | 100.00% | 4 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andreas Noever | 1520 | 76.81% | 8 | 47.06% |
| Mika Westerberg | 455 | 22.99% | 6 | 35.29% |
| Lukas Wunner | 3 | 0.15% | 2 | 11.76% |
| Greg Kroah-Hartman | 1 | 0.05% | 1 | 5.88% |
| Total | 1979 | 100.00% | 17 | 100.00% |
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