linux/drivers/thunderbolt/tb.c
Linus Torvalds 2bf16b7a73 Char/Misc patches for 4.15-rc1
Here is the big set of char/misc and other driver subsystem patches for
 4.15-rc1.
 
 There are small changes all over here, hyperv driver updates, pcmcia
 driver updates, w1 driver updats, vme driver updates, nvmem driver
 updates, and lots of other little one-off driver updates as well.  The
 shortlog has the full details.
 
 Note, there will be a merge conflict in drivers/misc/lkdtm_core.c when
 merging to your tree as one lkdtm patch came in through the perf tree as
 well as this one.  The resolution is to take the const change that this
 tree provides.
 
 All of these have been in linux-next for quite a while with no reported
 issues.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'char-misc-4.15-rc1' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

Pull char/misc updates from Greg KH:
 "Here is the big set of char/misc and other driver subsystem patches
  for 4.15-rc1.

  There are small changes all over here, hyperv driver updates, pcmcia
  driver updates, w1 driver updats, vme driver updates, nvmem driver
  updates, and lots of other little one-off driver updates as well. The
  shortlog has the full details.

  All of these have been in linux-next for quite a while with no
  reported issues"

* tag 'char-misc-4.15-rc1' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (90 commits)
  VME: Return -EBUSY when DMA list in use
  w1: keep balance of mutex locks and refcnts
  MAINTAINERS: Update VME subsystem tree.
  nvmem: sunxi-sid: add support for A64/H5's SID controller
  nvmem: imx-ocotp: Update module description
  nvmem: imx-ocotp: Enable i.MX7D OTP write support
  nvmem: imx-ocotp: Add i.MX7D timing write clock setup support
  nvmem: imx-ocotp: Move i.MX6 write clock setup to dedicated function
  nvmem: imx-ocotp: Add support for banked OTP addressing
  nvmem: imx-ocotp: Pass parameters via a struct
  nvmem: imx-ocotp: Restrict OTP write to IMX6 processors
  nvmem: uniphier: add UniPhier eFuse driver
  dt-bindings: nvmem: add description for UniPhier eFuse
  nvmem: set nvmem->owner to nvmem->dev->driver->owner if unset
  nvmem: qfprom: fix different address space warnings of sparse
  nvmem: mtk-efuse: fix different address space warnings of sparse
  nvmem: mtk-efuse: use stack for nvmem_config instead of malloc'ing it
  nvmem: imx-iim: use stack for nvmem_config instead of malloc'ing it
  thunderbolt: tb: fix use after free in tb_activate_pcie_devices
  MAINTAINERS: Add git tree for Thunderbolt development
  ...
2017-11-16 09:10:59 -08:00

473 lines
11 KiB
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]);
}
/**
* 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);
}
/**
* 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);
}
}
}
/**
* 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);
}
}
}
/**
* 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;
}
/**
* 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;
}
/**
* 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);
continue;
}
list_add(&tunnel->list, &tcm->tunnel_list);
}
}
/* 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);
}
/**
* 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);
}
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 */
}
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;
}
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;
}
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;
}
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;
}