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kernel/drivers/thunderbolt/switch.c

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// SPDX-License-Identifier: GPL-2.0
/*
* Thunderbolt driver - switch/port utility functions
*
* Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
* Copyright (C) 2018, Intel Corporation
*/
#include <linux/delay.h>
#include <linux/idr.h>
#include <linux/module.h>
#include <linux/nvmem-provider.h>
#include <linux/pm_runtime.h>
#include <linux/sched/signal.h>
#include <linux/sizes.h>
#include <linux/slab.h>
#include <linux/string_helpers.h>
#include "tb.h"
/* Switch NVM support */
struct nvm_auth_status {
struct list_head list;
uuid_t uuid;
u32 status;
};
/*
* Hold NVM authentication failure status per switch This information
* needs to stay around even when the switch gets power cycled so we
* keep it separately.
*/
static LIST_HEAD(nvm_auth_status_cache);
static DEFINE_MUTEX(nvm_auth_status_lock);
static struct nvm_auth_status *__nvm_get_auth_status(const struct tb_switch *sw)
{
struct nvm_auth_status *st;
list_for_each_entry(st, &nvm_auth_status_cache, list) {
if (uuid_equal(&st->uuid, sw->uuid))
return st;
}
return NULL;
}
static void nvm_get_auth_status(const struct tb_switch *sw, u32 *status)
{
struct nvm_auth_status *st;
mutex_lock(&nvm_auth_status_lock);
st = __nvm_get_auth_status(sw);
mutex_unlock(&nvm_auth_status_lock);
*status = st ? st->status : 0;
}
static void nvm_set_auth_status(const struct tb_switch *sw, u32 status)
{
struct nvm_auth_status *st;
if (WARN_ON(!sw->uuid))
return;
mutex_lock(&nvm_auth_status_lock);
st = __nvm_get_auth_status(sw);
if (!st) {
st = kzalloc(sizeof(*st), GFP_KERNEL);
if (!st)
goto unlock;
memcpy(&st->uuid, sw->uuid, sizeof(st->uuid));
INIT_LIST_HEAD(&st->list);
list_add_tail(&st->list, &nvm_auth_status_cache);
}
st->status = status;
unlock:
mutex_unlock(&nvm_auth_status_lock);
}
static void nvm_clear_auth_status(const struct tb_switch *sw)
{
struct nvm_auth_status *st;
mutex_lock(&nvm_auth_status_lock);
st = __nvm_get_auth_status(sw);
if (st) {
list_del(&st->list);
kfree(st);
}
mutex_unlock(&nvm_auth_status_lock);
}
static int nvm_validate_and_write(struct tb_switch *sw)
{
unsigned int image_size;
const u8 *buf;
int ret;
ret = tb_nvm_validate(sw->nvm);
if (ret)
return ret;
ret = tb_nvm_write_headers(sw->nvm);
if (ret)
return ret;
buf = sw->nvm->buf_data_start;
image_size = sw->nvm->buf_data_size;
if (tb_switch_is_usb4(sw))
ret = usb4_switch_nvm_write(sw, 0, buf, image_size);
else
ret = dma_port_flash_write(sw->dma_port, 0, buf, image_size);
if (ret)
return ret;
sw->nvm->flushed = true;
return 0;
}
static int nvm_authenticate_host_dma_port(struct tb_switch *sw)
{
int ret = 0;
/*
* Root switch NVM upgrade requires that we disconnect the
* existing paths first (in case it is not in safe mode
* already).
*/
if (!sw->safe_mode) {
u32 status;
ret = tb_domain_disconnect_all_paths(sw->tb);
if (ret)
return ret;
/*
* The host controller goes away pretty soon after this if
* everything goes well so getting timeout is expected.
*/
ret = dma_port_flash_update_auth(sw->dma_port);
if (!ret || ret == -ETIMEDOUT)
return 0;
/*
* Any error from update auth operation requires power
* cycling of the host router.
*/
tb_sw_warn(sw, "failed to authenticate NVM, power cycling\n");
if (dma_port_flash_update_auth_status(sw->dma_port, &status) > 0)
nvm_set_auth_status(sw, status);
}
/*
* From safe mode we can get out by just power cycling the
* switch.
*/
dma_port_power_cycle(sw->dma_port);
return ret;
}
static int nvm_authenticate_device_dma_port(struct tb_switch *sw)
{
int ret, retries = 10;
ret = dma_port_flash_update_auth(sw->dma_port);
switch (ret) {
case 0:
case -ETIMEDOUT:
case -EACCES:
case -EINVAL:
/* Power cycle is required */
break;
default:
return ret;
}
/*
* Poll here for the authentication status. It takes some time
* for the device to respond (we get timeout for a while). Once
* we get response the device needs to be power cycled in order
* to the new NVM to be taken into use.
*/
do {
u32 status;
ret = dma_port_flash_update_auth_status(sw->dma_port, &status);
if (ret < 0 && ret != -ETIMEDOUT)
return ret;
if (ret > 0) {
if (status) {
tb_sw_warn(sw, "failed to authenticate NVM\n");
nvm_set_auth_status(sw, status);
}
tb_sw_info(sw, "power cycling the switch now\n");
dma_port_power_cycle(sw->dma_port);
return 0;
}
msleep(500);
} while (--retries);
return -ETIMEDOUT;
}
static void nvm_authenticate_start_dma_port(struct tb_switch *sw)
{
struct pci_dev *root_port;
/*
* During host router NVM upgrade we should not allow root port to
* go into D3cold because some root ports cannot trigger PME
* itself. To be on the safe side keep the root port in D0 during
* the whole upgrade process.
*/
root_port = pcie_find_root_port(sw->tb->nhi->pdev);
if (root_port)
pm_runtime_get_noresume(&root_port->dev);
}
static void nvm_authenticate_complete_dma_port(struct tb_switch *sw)
{
struct pci_dev *root_port;
root_port = pcie_find_root_port(sw->tb->nhi->pdev);
if (root_port)
pm_runtime_put(&root_port->dev);
}
static inline bool nvm_readable(struct tb_switch *sw)
{
if (tb_switch_is_usb4(sw)) {
/*
* USB4 devices must support NVM operations but it is
* optional for hosts. Therefore we query the NVM sector
* size here and if it is supported assume NVM
* operations are implemented.
*/
return usb4_switch_nvm_sector_size(sw) > 0;
}
/* Thunderbolt 2 and 3 devices support NVM through DMA port */
return !!sw->dma_port;
}
static inline bool nvm_upgradeable(struct tb_switch *sw)
{
if (sw->no_nvm_upgrade)
return false;
return nvm_readable(sw);
}
static int nvm_authenticate(struct tb_switch *sw, bool auth_only)
{
int ret;
if (tb_switch_is_usb4(sw)) {
if (auth_only) {
ret = usb4_switch_nvm_set_offset(sw, 0);
if (ret)
return ret;
}
sw->nvm->authenticating = true;
return usb4_switch_nvm_authenticate(sw);
}
if (auth_only)
return -EOPNOTSUPP;
sw->nvm->authenticating = true;
if (!tb_route(sw)) {
nvm_authenticate_start_dma_port(sw);
ret = nvm_authenticate_host_dma_port(sw);
} else {
ret = nvm_authenticate_device_dma_port(sw);
}
return ret;
}
/**
* tb_switch_nvm_read() - Read router NVM
* @sw: Router whose NVM to read
* @address: Start address on the NVM
* @buf: Buffer where the read data is copied
* @size: Size of the buffer in bytes
*
* Reads from router NVM and returns the requested data in @buf. Locking
* is up to the caller. Returns %0 in success and negative errno in case
* of failure.
*/
int tb_switch_nvm_read(struct tb_switch *sw, unsigned int address, void *buf,
size_t size)
{
if (tb_switch_is_usb4(sw))
return usb4_switch_nvm_read(sw, address, buf, size);
return dma_port_flash_read(sw->dma_port, address, buf, size);
}
static int nvm_read(void *priv, unsigned int offset, void *val, size_t bytes)
{
struct tb_nvm *nvm = priv;
struct tb_switch *sw = tb_to_switch(nvm->dev);
int ret;
pm_runtime_get_sync(&sw->dev);
if (!mutex_trylock(&sw->tb->lock)) {
ret = restart_syscall();
goto out;
}
ret = tb_switch_nvm_read(sw, offset, val, bytes);
mutex_unlock(&sw->tb->lock);
out:
pm_runtime_mark_last_busy(&sw->dev);
pm_runtime_put_autosuspend(&sw->dev);
return ret;
}
static int nvm_write(void *priv, unsigned int offset, void *val, size_t bytes)
{
struct tb_nvm *nvm = priv;
struct tb_switch *sw = tb_to_switch(nvm->dev);
int ret;
if (!mutex_trylock(&sw->tb->lock))
return restart_syscall();
/*
* Since writing the NVM image might require some special steps,
* for example when CSS headers are written, we cache the image
* locally here and handle the special cases when the user asks
* us to authenticate the image.
*/
ret = tb_nvm_write_buf(nvm, offset, val, bytes);
mutex_unlock(&sw->tb->lock);
return ret;
}
static int tb_switch_nvm_add(struct tb_switch *sw)
{
struct tb_nvm *nvm;
int ret;
if (!nvm_readable(sw))
return 0;
nvm = tb_nvm_alloc(&sw->dev);
if (IS_ERR(nvm)) {
ret = PTR_ERR(nvm) == -EOPNOTSUPP ? 0 : PTR_ERR(nvm);
goto err_nvm;
}
ret = tb_nvm_read_version(nvm);
if (ret)
goto err_nvm;
/*
* If the switch is in safe-mode the only accessible portion of
* the NVM is the non-active one where userspace is expected to
* write new functional NVM.
*/
if (!sw->safe_mode) {
ret = tb_nvm_add_active(nvm, nvm_read);
if (ret)
goto err_nvm;
tb_sw_dbg(sw, "NVM version %x.%x\n", nvm->major, nvm->minor);
}
if (!sw->no_nvm_upgrade) {
ret = tb_nvm_add_non_active(nvm, nvm_write);
if (ret)
goto err_nvm;
}
sw->nvm = nvm;
return 0;
err_nvm:
tb_sw_dbg(sw, "NVM upgrade disabled\n");
sw->no_nvm_upgrade = true;
if (!IS_ERR(nvm))
tb_nvm_free(nvm);
return ret;
}
static void tb_switch_nvm_remove(struct tb_switch *sw)
{
struct tb_nvm *nvm;
nvm = sw->nvm;
sw->nvm = NULL;
if (!nvm)
return;
/* Remove authentication status in case the switch is unplugged */
if (!nvm->authenticating)
nvm_clear_auth_status(sw);
tb_nvm_free(nvm);
}
/* port utility functions */
static const char *tb_port_type(const struct tb_regs_port_header *port)
{
switch (port->type >> 16) {
case 0:
switch ((u8) port->type) {
case 0:
return "Inactive";
case 1:
return "Port";
case 2:
return "NHI";
default:
return "unknown";
}
case 0x2:
return "Ethernet";
case 0x8:
return "SATA";
case 0xe:
return "DP/HDMI";
case 0x10:
return "PCIe";
case 0x20:
return "USB";
default:
return "unknown";
}
}
static void tb_dump_port(struct tb *tb, const struct tb_port *port)
{
const struct tb_regs_port_header *regs = &port->config;
tb_dbg(tb,
" Port %d: %x:%x (Revision: %d, TB Version: %d, Type: %s (%#x))\n",
regs->port_number, regs->vendor_id, regs->device_id,
regs->revision, regs->thunderbolt_version, tb_port_type(regs),
regs->type);
tb_dbg(tb, " Max hop id (in/out): %d/%d\n",
regs->max_in_hop_id, regs->max_out_hop_id);
tb_dbg(tb, " Max counters: %d\n", regs->max_counters);
tb_dbg(tb, " NFC Credits: %#x\n", regs->nfc_credits);
tb_dbg(tb, " Credits (total/control): %u/%u\n", port->total_credits,
port->ctl_credits);
}
/**
* tb_port_state() - get connectedness state of a port
* @port: the port to check
*
* The port must have a TB_CAP_PHY (i.e. it should be a real port).
*
* Return: Returns an enum tb_port_state on success or an error code on failure.
*/
int tb_port_state(struct tb_port *port)
{
struct tb_cap_phy phy;
int res;
if (port->cap_phy == 0) {
tb_port_WARN(port, "does not have a PHY\n");
return -EINVAL;
}
res = tb_port_read(port, &phy, TB_CFG_PORT, port->cap_phy, 2);
if (res)
return res;
return phy.state;
}
/**
* tb_wait_for_port() - wait for a port to become ready
* @port: Port to wait
* @wait_if_unplugged: Wait also when port is unplugged
*
* Wait up to 1 second for a port to reach state TB_PORT_UP. If
* wait_if_unplugged is set then we also wait if the port is in state
* TB_PORT_UNPLUGGED (it takes a while for the device to be registered after
* switch resume). Otherwise we only wait if a device is registered but the link
* has not yet been established.
*
* Return: Returns an error code on failure. Returns 0 if the port is not
* connected or failed to reach state TB_PORT_UP within one second. Returns 1
* if the port is connected and in state TB_PORT_UP.
*/
int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged)
{
int retries = 10;
int state;
if (!port->cap_phy) {
tb_port_WARN(port, "does not have PHY\n");
return -EINVAL;
}
if (tb_is_upstream_port(port)) {
tb_port_WARN(port, "is the upstream port\n");
return -EINVAL;
}
while (retries--) {
state = tb_port_state(port);
switch (state) {
case TB_PORT_DISABLED:
tb_port_dbg(port, "is disabled (state: 0)\n");
return 0;
case TB_PORT_UNPLUGGED:
if (wait_if_unplugged) {
/* used during resume */
tb_port_dbg(port,
"is unplugged (state: 7), retrying...\n");
msleep(100);
break;
}
tb_port_dbg(port, "is unplugged (state: 7)\n");
return 0;
case TB_PORT_UP:
case TB_PORT_TX_CL0S:
case TB_PORT_RX_CL0S:
case TB_PORT_CL1:
case TB_PORT_CL2:
tb_port_dbg(port, "is connected, link is up (state: %d)\n", state);
return 1;
default:
if (state < 0)
return state;
/*
* After plug-in the state is TB_PORT_CONNECTING. Give it some
* time.
*/
tb_port_dbg(port,
"is connected, link is not up (state: %d), retrying...\n",
state);
msleep(100);
}
}
tb_port_warn(port,
"failed to reach state TB_PORT_UP. Ignoring port...\n");
return 0;
}
/**
* tb_port_add_nfc_credits() - add/remove non flow controlled credits to port
* @port: Port to add/remove NFC credits
* @credits: Credits to add/remove
*
* Change the number of NFC credits allocated to @port by @credits. To remove
* NFC credits pass a negative amount of credits.
*
* Return: Returns 0 on success or an error code on failure.
*/
int tb_port_add_nfc_credits(struct tb_port *port, int credits)
{
u32 nfc_credits;
if (credits == 0 || port->sw->is_unplugged)
return 0;
/*
* USB4 restricts programming NFC buffers to lane adapters only
* so skip other ports.
*/
if (tb_switch_is_usb4(port->sw) && !tb_port_is_null(port))
return 0;
nfc_credits = port->config.nfc_credits & ADP_CS_4_NFC_BUFFERS_MASK;
if (credits < 0)
credits = max_t(int, -nfc_credits, credits);
nfc_credits += credits;
tb_port_dbg(port, "adding %d NFC credits to %lu", credits,
port->config.nfc_credits & ADP_CS_4_NFC_BUFFERS_MASK);
port->config.nfc_credits &= ~ADP_CS_4_NFC_BUFFERS_MASK;
port->config.nfc_credits |= nfc_credits;
return tb_port_write(port, &port->config.nfc_credits,
TB_CFG_PORT, ADP_CS_4, 1);
}
/**
* tb_port_clear_counter() - clear a counter in TB_CFG_COUNTER
* @port: Port whose counters to clear
* @counter: Counter index to clear
*
* Return: Returns 0 on success or an error code on failure.
*/
int tb_port_clear_counter(struct tb_port *port, int counter)
{
u32 zero[3] = { 0, 0, 0 };
tb_port_dbg(port, "clearing counter %d\n", counter);
return tb_port_write(port, zero, TB_CFG_COUNTERS, 3 * counter, 3);
}
/**
* tb_port_unlock() - Unlock downstream port
* @port: Port to unlock
*
* Needed for USB4 but can be called for any CIO/USB4 ports. Makes the
* downstream router accessible for CM.
*/
int tb_port_unlock(struct tb_port *port)
{
if (tb_switch_is_icm(port->sw))
return 0;
if (!tb_port_is_null(port))
return -EINVAL;
if (tb_switch_is_usb4(port->sw))
return usb4_port_unlock(port);
return 0;
}
static int __tb_port_enable(struct tb_port *port, bool enable)
{
int ret;
u32 phy;
if (!tb_port_is_null(port))
return -EINVAL;
ret = tb_port_read(port, &phy, TB_CFG_PORT,
port->cap_phy + LANE_ADP_CS_1, 1);
if (ret)
return ret;
if (enable)
phy &= ~LANE_ADP_CS_1_LD;
else
phy |= LANE_ADP_CS_1_LD;
ret = tb_port_write(port, &phy, TB_CFG_PORT,
port->cap_phy + LANE_ADP_CS_1, 1);
if (ret)
return ret;
tb_port_dbg(port, "lane %s\n", str_enabled_disabled(enable));
return 0;
}
/**
* tb_port_enable() - Enable lane adapter
* @port: Port to enable (can be %NULL)
*
* This is used for lane 0 and 1 adapters to enable it.
*/
int tb_port_enable(struct tb_port *port)
{
return __tb_port_enable(port, true);
}
/**
* tb_port_disable() - Disable lane adapter
* @port: Port to disable (can be %NULL)
*
* This is used for lane 0 and 1 adapters to disable it.
*/
int tb_port_disable(struct tb_port *port)
{
return __tb_port_enable(port, false);
}
static int tb_port_reset(struct tb_port *port)
{
if (tb_switch_is_usb4(port->sw))
return port->cap_usb4 ? usb4_port_reset(port) : 0;
return tb_lc_reset_port(port);
}
/*
* tb_init_port() - initialize a port
*
* This is a helper method for tb_switch_alloc. Does not check or initialize
* any downstream switches.
*
* Return: Returns 0 on success or an error code on failure.
*/
static int tb_init_port(struct tb_port *port)
{
int res;
int cap;
INIT_LIST_HEAD(&port->list);
/* Control adapter does not have configuration space */
if (!port->port)
return 0;
res = tb_port_read(port, &port->config, TB_CFG_PORT, 0, 8);
if (res) {
if (res == -ENODEV) {
tb_dbg(port->sw->tb, " Port %d: not implemented\n",
port->port);
port->disabled = true;
return 0;
}
return res;
}
/* Port 0 is the switch itself and has no PHY. */
if (port->config.type == TB_TYPE_PORT) {
cap = tb_port_find_cap(port, TB_PORT_CAP_PHY);
if (cap > 0)
port->cap_phy = cap;
else
tb_port_WARN(port, "non switch port without a PHY\n");
cap = tb_port_find_cap(port, TB_PORT_CAP_USB4);
if (cap > 0)
port->cap_usb4 = cap;
/*
* USB4 ports the buffers allocated for the control path
* can be read from the path config space. Legacy
* devices we use hard-coded value.
*/
if (port->cap_usb4) {
struct tb_regs_hop hop;
if (!tb_port_read(port, &hop, TB_CFG_HOPS, 0, 2))
port->ctl_credits = hop.initial_credits;
}
if (!port->ctl_credits)
port->ctl_credits = 2;
} else {
cap = tb_port_find_cap(port, TB_PORT_CAP_ADAP);
if (cap > 0)
port->cap_adap = cap;
}
port->total_credits =
(port->config.nfc_credits & ADP_CS_4_TOTAL_BUFFERS_MASK) >>
ADP_CS_4_TOTAL_BUFFERS_SHIFT;
tb_dump_port(port->sw->tb, port);
return 0;
}
static int tb_port_alloc_hopid(struct tb_port *port, bool in, int min_hopid,
int max_hopid)
{
int port_max_hopid;
struct ida *ida;
if (in) {
port_max_hopid = port->config.max_in_hop_id;
ida = &port->in_hopids;
} else {
port_max_hopid = port->config.max_out_hop_id;
ida = &port->out_hopids;
}
/*
* NHI can use HopIDs 1-max for other adapters HopIDs 0-7 are
* reserved.
*/
if (!tb_port_is_nhi(port) && min_hopid < TB_PATH_MIN_HOPID)
min_hopid = TB_PATH_MIN_HOPID;
if (max_hopid < 0 || max_hopid > port_max_hopid)
max_hopid = port_max_hopid;
return ida_alloc_range(ida, min_hopid, max_hopid, GFP_KERNEL);
}
/**
* tb_port_alloc_in_hopid() - Allocate input HopID from port
* @port: Port to allocate HopID for
* @min_hopid: Minimum acceptable input HopID
* @max_hopid: Maximum acceptable input HopID
*
* Return: HopID between @min_hopid and @max_hopid or negative errno in
* case of error.
*/
int tb_port_alloc_in_hopid(struct tb_port *port, int min_hopid, int max_hopid)
{
return tb_port_alloc_hopid(port, true, min_hopid, max_hopid);
}
/**
* tb_port_alloc_out_hopid() - Allocate output HopID from port
* @port: Port to allocate HopID for
* @min_hopid: Minimum acceptable output HopID
* @max_hopid: Maximum acceptable output HopID
*
* Return: HopID between @min_hopid and @max_hopid or negative errno in
* case of error.
*/
int tb_port_alloc_out_hopid(struct tb_port *port, int min_hopid, int max_hopid)
{
return tb_port_alloc_hopid(port, false, min_hopid, max_hopid);
}
/**
* tb_port_release_in_hopid() - Release allocated input HopID from port
* @port: Port whose HopID to release
* @hopid: HopID to release
*/
void tb_port_release_in_hopid(struct tb_port *port, int hopid)
{
ida_free(&port->in_hopids, hopid);
}
/**
* tb_port_release_out_hopid() - Release allocated output HopID from port
* @port: Port whose HopID to release
* @hopid: HopID to release
*/
void tb_port_release_out_hopid(struct tb_port *port, int hopid)
{
ida_free(&port->out_hopids, hopid);
}
static inline bool tb_switch_is_reachable(const struct tb_switch *parent,
const struct tb_switch *sw)
{
u64 mask = (1ULL << parent->config.depth * 8) - 1;
return (tb_route(parent) & mask) == (tb_route(sw) & mask);
}
/**
* tb_next_port_on_path() - Return next port for given port on a path
* @start: Start port of the walk
* @end: End port of the walk
* @prev: Previous port (%NULL if this is the first)
*
* This function can be used to walk from one port to another if they
* are connected through zero or more switches. If the @prev is dual
* link port, the function follows that link and returns another end on
* that same link.
*
* If the @end port has been reached, return %NULL.
*
* Domain tb->lock must be held when this function is called.
*/
struct tb_port *tb_next_port_on_path(struct tb_port *start, struct tb_port *end,
struct tb_port *prev)
{
struct tb_port *next;
if (!prev)
return start;
if (prev->sw == end->sw) {
if (prev == end)
return NULL;
return end;
}
if (tb_switch_is_reachable(prev->sw, end->sw)) {
next = tb_port_at(tb_route(end->sw), prev->sw);
/* Walk down the topology if next == prev */
if (prev->remote &&
(next == prev || next->dual_link_port == prev))
next = prev->remote;
} else {
if (tb_is_upstream_port(prev)) {
next = prev->remote;
} else {
next = tb_upstream_port(prev->sw);
/*
* Keep the same link if prev and next are both
* dual link ports.
*/
if (next->dual_link_port &&
next->link_nr != prev->link_nr) {
next = next->dual_link_port;
}
}
}
return next != prev ? next : NULL;
}
/**
* tb_port_get_link_speed() - Get current link speed
* @port: Port to check (USB4 or CIO)
*
* Returns link speed in Gb/s or negative errno in case of failure.
*/
int tb_port_get_link_speed(struct tb_port *port)
{
u32 val, speed;
int ret;
if (!port->cap_phy)
return -EINVAL;
ret = tb_port_read(port, &val, TB_CFG_PORT,
port->cap_phy + LANE_ADP_CS_1, 1);
if (ret)
return ret;
speed = (val & LANE_ADP_CS_1_CURRENT_SPEED_MASK) >>
LANE_ADP_CS_1_CURRENT_SPEED_SHIFT;
switch (speed) {
case LANE_ADP_CS_1_CURRENT_SPEED_GEN4:
return 40;
case LANE_ADP_CS_1_CURRENT_SPEED_GEN3:
return 20;
default:
return 10;
}
}
/**
* tb_port_get_link_generation() - Returns link generation
* @port: Lane adapter
*
* Returns link generation as number or negative errno in case of
* failure. Does not distinguish between Thunderbolt 1 and Thunderbolt 2
* links so for those always returns 2.
*/
int tb_port_get_link_generation(struct tb_port *port)
{
int ret;
ret = tb_port_get_link_speed(port);
if (ret < 0)
return ret;
switch (ret) {
case 40:
return 4;
case 20:
return 3;
default:
return 2;
}
}
/**
* tb_port_get_link_width() - Get current link width
* @port: Port to check (USB4 or CIO)
*
* Returns link width. Return the link width as encoded in &enum
* tb_link_width or negative errno in case of failure.
*/
int tb_port_get_link_width(struct tb_port *port)
{
u32 val;
int ret;
if (!port->cap_phy)
return -EINVAL;
ret = tb_port_read(port, &val, TB_CFG_PORT,
port->cap_phy + LANE_ADP_CS_1, 1);
if (ret)
return ret;
/* Matches the values in enum tb_link_width */
return (val & LANE_ADP_CS_1_CURRENT_WIDTH_MASK) >>
LANE_ADP_CS_1_CURRENT_WIDTH_SHIFT;
}
/**
* tb_port_width_supported() - Is the given link width supported
* @port: Port to check
* @width: Widths to check (bitmask)
*
* Can be called to any lane adapter. Checks if given @width is
* supported by the hardware and returns %true if it is.
*/
bool tb_port_width_supported(struct tb_port *port, unsigned int width)
{
u32 phy, widths;
int ret;
if (!port->cap_phy)
return false;
if (width & (TB_LINK_WIDTH_ASYM_TX | TB_LINK_WIDTH_ASYM_RX)) {
if (tb_port_get_link_generation(port) < 4 ||
!usb4_port_asym_supported(port))
return false;
}
ret = tb_port_read(port, &phy, TB_CFG_PORT,
port->cap_phy + LANE_ADP_CS_0, 1);
if (ret)
return false;
/*
* The field encoding is the same as &enum tb_link_width (which is
* passed to @width).
*/
widths = FIELD_GET(LANE_ADP_CS_0_SUPPORTED_WIDTH_MASK, phy);
return widths & width;
}
/**
* tb_port_set_link_width() - Set target link width of the lane adapter
* @port: Lane adapter
* @width: Target link width
*
* Sets the target link width of the lane adapter to @width. Does not
* enable/disable lane bonding. For that call tb_port_set_lane_bonding().
*
* Return: %0 in case of success and negative errno in case of error
*/
int tb_port_set_link_width(struct tb_port *port, enum tb_link_width width)
{
u32 val;
int ret;
if (!port->cap_phy)
return -EINVAL;
ret = tb_port_read(port, &val, TB_CFG_PORT,
port->cap_phy + LANE_ADP_CS_1, 1);
if (ret)
return ret;
val &= ~LANE_ADP_CS_1_TARGET_WIDTH_MASK;
switch (width) {
case TB_LINK_WIDTH_SINGLE:
/* Gen 4 link cannot be single */
if (tb_port_get_link_generation(port) >= 4)
return -EOPNOTSUPP;
val |= LANE_ADP_CS_1_TARGET_WIDTH_SINGLE <<
LANE_ADP_CS_1_TARGET_WIDTH_SHIFT;
break;
case TB_LINK_WIDTH_DUAL:
if (tb_port_get_link_generation(port) >= 4)
return usb4_port_asym_set_link_width(port, width);
val |= LANE_ADP_CS_1_TARGET_WIDTH_DUAL <<
LANE_ADP_CS_1_TARGET_WIDTH_SHIFT;
break;
case TB_LINK_WIDTH_ASYM_TX:
case TB_LINK_WIDTH_ASYM_RX:
return usb4_port_asym_set_link_width(port, width);
default:
return -EINVAL;
}
return tb_port_write(port, &val, TB_CFG_PORT,
port->cap_phy + LANE_ADP_CS_1, 1);
}
/**
* tb_port_set_lane_bonding() - Enable/disable lane bonding
* @port: Lane adapter
* @bonding: enable/disable bonding
*
* Enables or disables lane bonding. This should be called after target
* link width has been set (tb_port_set_link_width()). Note in most
* cases one should use tb_port_lane_bonding_enable() instead to enable
* lane bonding.
*
* Return: %0 in case of success and negative errno in case of error
*/
static int tb_port_set_lane_bonding(struct tb_port *port, bool bonding)
{
u32 val;
int ret;
if (!port->cap_phy)
return -EINVAL;
ret = tb_port_read(port, &val, TB_CFG_PORT,
port->cap_phy + LANE_ADP_CS_1, 1);
if (ret)
return ret;
if (bonding)
val |= LANE_ADP_CS_1_LB;
else
val &= ~LANE_ADP_CS_1_LB;
return tb_port_write(port, &val, TB_CFG_PORT,
port->cap_phy + LANE_ADP_CS_1, 1);
}
/**
* tb_port_lane_bonding_enable() - Enable bonding on port
* @port: port to enable
*
* Enable bonding by setting the link width of the port and the other
* port in case of dual link port. Does not wait for the link to
* actually reach the bonded state so caller needs to call
* tb_port_wait_for_link_width() before enabling any paths through the
* link to make sure the link is in expected state.
*
* Return: %0 in case of success and negative errno in case of error
*/
int tb_port_lane_bonding_enable(struct tb_port *port)
{
enum tb_link_width width;
int ret;
/*
* Enable lane bonding for both links if not already enabled by
* for example the boot firmware.
*/
width = tb_port_get_link_width(port);
if (width == TB_LINK_WIDTH_SINGLE) {
ret = tb_port_set_link_width(port, TB_LINK_WIDTH_DUAL);
if (ret)
goto err_lane0;
}
width = tb_port_get_link_width(port->dual_link_port);
if (width == TB_LINK_WIDTH_SINGLE) {
ret = tb_port_set_link_width(port->dual_link_port,
TB_LINK_WIDTH_DUAL);
if (ret)
goto err_lane1;
}
/*
* Only set bonding if the link was not already bonded. This
* avoids the lane adapter to re-enter bonding state.
*/
if (width == TB_LINK_WIDTH_SINGLE && !tb_is_upstream_port(port)) {
ret = tb_port_set_lane_bonding(port, true);
if (ret)
goto err_lane1;
}
/*
* When lane 0 bonding is set it will affect lane 1 too so
* update both.
*/
port->bonded = true;
port->dual_link_port->bonded = true;
return 0;
err_lane1:
tb_port_set_link_width(port->dual_link_port, TB_LINK_WIDTH_SINGLE);
err_lane0:
tb_port_set_link_width(port, TB_LINK_WIDTH_SINGLE);
return ret;
}
/**
* tb_port_lane_bonding_disable() - Disable bonding on port
* @port: port to disable
*
* Disable bonding by setting the link width of the port and the
* other port in case of dual link port.
*/
void tb_port_lane_bonding_disable(struct tb_port *port)
{
tb_port_set_lane_bonding(port, false);
tb_port_set_link_width(port->dual_link_port, TB_LINK_WIDTH_SINGLE);
tb_port_set_link_width(port, TB_LINK_WIDTH_SINGLE);
port->dual_link_port->bonded = false;
port->bonded = false;
}
/**
* tb_port_wait_for_link_width() - Wait until link reaches specific width
* @port: Port to wait for
* @width: Expected link width (bitmask)
* @timeout_msec: Timeout in ms how long to wait
*
* Should be used after both ends of the link have been bonded (or
* bonding has been disabled) to wait until the link actually reaches
* the expected state. Returns %-ETIMEDOUT if the width was not reached
* within the given timeout, %0 if it did. Can be passed a mask of
* expected widths and succeeds if any of the widths is reached.
*/
int tb_port_wait_for_link_width(struct tb_port *port, unsigned int width,
int timeout_msec)
{
ktime_t timeout = ktime_add_ms(ktime_get(), timeout_msec);
int ret;
/* Gen 4 link does not support single lane */
if ((width & TB_LINK_WIDTH_SINGLE) &&
tb_port_get_link_generation(port) >= 4)
return -EOPNOTSUPP;
do {
ret = tb_port_get_link_width(port);
if (ret < 0) {
/*
* Sometimes we get port locked error when
* polling the lanes so we can ignore it and
* retry.
*/
if (ret != -EACCES)
return ret;
} else if (ret & width) {
return 0;
}
usleep_range(1000, 2000);
} while (ktime_before(ktime_get(), timeout));
return -ETIMEDOUT;
}
static int tb_port_do_update_credits(struct tb_port *port)
{
u32 nfc_credits;
int ret;
ret = tb_port_read(port, &nfc_credits, TB_CFG_PORT, ADP_CS_4, 1);
if (ret)
return ret;
if (nfc_credits != port->config.nfc_credits) {
u32 total;
total = (nfc_credits & ADP_CS_4_TOTAL_BUFFERS_MASK) >>
ADP_CS_4_TOTAL_BUFFERS_SHIFT;
tb_port_dbg(port, "total credits changed %u -> %u\n",
port->total_credits, total);
port->config.nfc_credits = nfc_credits;
port->total_credits = total;
}
return 0;
}
/**
* tb_port_update_credits() - Re-read port total credits
* @port: Port to update
*
* After the link is bonded (or bonding was disabled) the port total
* credits may change, so this function needs to be called to re-read
* the credits. Updates also the second lane adapter.
*/
int tb_port_update_credits(struct tb_port *port)
{
int ret;
ret = tb_port_do_update_credits(port);
if (ret)
return ret;
if (!port->dual_link_port)
return 0;
return tb_port_do_update_credits(port->dual_link_port);
}
static int tb_port_start_lane_initialization(struct tb_port *port)
{
int ret;
if (tb_switch_is_usb4(port->sw))
return 0;
ret = tb_lc_start_lane_initialization(port);
return ret == -EINVAL ? 0 : ret;
}
/*
* Returns true if the port had something (router, XDomain) connected
* before suspend.
*/
static bool tb_port_resume(struct tb_port *port)
{
bool has_remote = tb_port_has_remote(port);
if (port->usb4) {
usb4_port_device_resume(port->usb4);
} else if (!has_remote) {
/*
* For disconnected downstream lane adapters start lane
* initialization now so we detect future connects.
*
* For XDomain start the lane initialzation now so the
* link gets re-established.
*
* This is only needed for non-USB4 ports.
*/
if (!tb_is_upstream_port(port) || port->xdomain)
tb_port_start_lane_initialization(port);
}
return has_remote || port->xdomain;
}
/**
* tb_port_is_enabled() - Is the adapter port enabled
* @port: Port to check
*/
bool tb_port_is_enabled(struct tb_port *port)
{
switch (port->config.type) {
case TB_TYPE_PCIE_UP:
case TB_TYPE_PCIE_DOWN:
return tb_pci_port_is_enabled(port);
case TB_TYPE_DP_HDMI_IN:
case TB_TYPE_DP_HDMI_OUT:
return tb_dp_port_is_enabled(port);
case TB_TYPE_USB3_UP:
case TB_TYPE_USB3_DOWN:
return tb_usb3_port_is_enabled(port);
default:
return false;
}
}
/**
* tb_usb3_port_is_enabled() - Is the USB3 adapter port enabled
* @port: USB3 adapter port to check
*/
bool tb_usb3_port_is_enabled(struct tb_port *port)
{
u32 data;
if (tb_port_read(port, &data, TB_CFG_PORT,
port->cap_adap + ADP_USB3_CS_0, 1))
return false;
return !!(data & ADP_USB3_CS_0_PE);
}
/**
* tb_usb3_port_enable() - Enable USB3 adapter port
* @port: USB3 adapter port to enable
* @enable: Enable/disable the USB3 adapter
*/
int tb_usb3_port_enable(struct tb_port *port, bool enable)
{
u32 word = enable ? (ADP_USB3_CS_0_PE | ADP_USB3_CS_0_V)
: ADP_USB3_CS_0_V;
if (!port->cap_adap)
return -ENXIO;
return tb_port_write(port, &word, TB_CFG_PORT,
port->cap_adap + ADP_USB3_CS_0, 1);
}
/**
* tb_pci_port_is_enabled() - Is the PCIe adapter port enabled
* @port: PCIe port to check
*/
bool tb_pci_port_is_enabled(struct tb_port *port)
{
u32 data;
if (tb_port_read(port, &data, TB_CFG_PORT,
port->cap_adap + ADP_PCIE_CS_0, 1))
return false;
return !!(data & ADP_PCIE_CS_0_PE);
}
/**
* tb_pci_port_enable() - Enable PCIe adapter port
* @port: PCIe port to enable
* @enable: Enable/disable the PCIe adapter
*/
int tb_pci_port_enable(struct tb_port *port, bool enable)
{
u32 word = enable ? ADP_PCIE_CS_0_PE : 0x0;
if (!port->cap_adap)
return -ENXIO;
return tb_port_write(port, &word, TB_CFG_PORT,
port->cap_adap + ADP_PCIE_CS_0, 1);
}
/**
* tb_dp_port_hpd_is_active() - Is HPD already active
* @port: DP out port to check
*
* Checks if the DP OUT adapter port has HPD bit already set.
*/
int tb_dp_port_hpd_is_active(struct tb_port *port)
{
u32 data;
int ret;
ret = tb_port_read(port, &data, TB_CFG_PORT,
port->cap_adap + ADP_DP_CS_2, 1);
if (ret)
return ret;
return !!(data & ADP_DP_CS_2_HPD);
}
/**
* tb_dp_port_hpd_clear() - Clear HPD from DP IN port
* @port: Port to clear HPD
*
* If the DP IN port has HPD set, this function can be used to clear it.
*/
int tb_dp_port_hpd_clear(struct tb_port *port)
{
u32 data;
int ret;
ret = tb_port_read(port, &data, TB_CFG_PORT,
port->cap_adap + ADP_DP_CS_3, 1);
if (ret)
return ret;
data |= ADP_DP_CS_3_HPDC;
return tb_port_write(port, &data, TB_CFG_PORT,
port->cap_adap + ADP_DP_CS_3, 1);
}
/**
* tb_dp_port_set_hops() - Set video/aux Hop IDs for DP port
* @port: DP IN/OUT port to set hops
* @video: Video Hop ID
* @aux_tx: AUX TX Hop ID
* @aux_rx: AUX RX Hop ID
*
* Programs specified Hop IDs for DP IN/OUT port. Can be called for USB4
* router DP adapters too but does not program the values as the fields
* are read-only.
*/
int tb_dp_port_set_hops(struct tb_port *port, unsigned int video,
unsigned int aux_tx, unsigned int aux_rx)
{
u32 data[2];
int ret;
if (tb_switch_is_usb4(port->sw))
return 0;
ret = tb_port_read(port, data, TB_CFG_PORT,
port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
if (ret)
return ret;
data[0] &= ~ADP_DP_CS_0_VIDEO_HOPID_MASK;
data[1] &= ~ADP_DP_CS_1_AUX_RX_HOPID_MASK;
data[1] &= ~ADP_DP_CS_1_AUX_RX_HOPID_MASK;
data[0] |= (video << ADP_DP_CS_0_VIDEO_HOPID_SHIFT) &
ADP_DP_CS_0_VIDEO_HOPID_MASK;
data[1] |= aux_tx & ADP_DP_CS_1_AUX_TX_HOPID_MASK;
data[1] |= (aux_rx << ADP_DP_CS_1_AUX_RX_HOPID_SHIFT) &
ADP_DP_CS_1_AUX_RX_HOPID_MASK;
return tb_port_write(port, data, TB_CFG_PORT,
port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
}
/**
* tb_dp_port_is_enabled() - Is DP adapter port enabled
* @port: DP adapter port to check
*/
bool tb_dp_port_is_enabled(struct tb_port *port)
{
u32 data[2];
if (tb_port_read(port, data, TB_CFG_PORT, port->cap_adap + ADP_DP_CS_0,
ARRAY_SIZE(data)))
return false;
return !!(data[0] & (ADP_DP_CS_0_VE | ADP_DP_CS_0_AE));
}
/**
* tb_dp_port_enable() - Enables/disables DP paths of a port
* @port: DP IN/OUT port
* @enable: Enable/disable DP path
*
* Once Hop IDs are programmed DP paths can be enabled or disabled by
* calling this function.
*/
int tb_dp_port_enable(struct tb_port *port, bool enable)
{
u32 data[2];
int ret;
ret = tb_port_read(port, data, TB_CFG_PORT,
port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
if (ret)
return ret;
if (enable)
data[0] |= ADP_DP_CS_0_VE | ADP_DP_CS_0_AE;
else
data[0] &= ~(ADP_DP_CS_0_VE | ADP_DP_CS_0_AE);
return tb_port_write(port, data, TB_CFG_PORT,
port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
}
/* switch utility functions */
static const char *tb_switch_generation_name(const struct tb_switch *sw)
{
switch (sw->generation) {
case 1:
return "Thunderbolt 1";
case 2:
return "Thunderbolt 2";
case 3:
return "Thunderbolt 3";
case 4:
return "USB4";
default:
return "Unknown";
}
}
static void tb_dump_switch(const struct tb *tb, const struct tb_switch *sw)
{
const struct tb_regs_switch_header *regs = &sw->config;
tb_dbg(tb, " %s Switch: %x:%x (Revision: %d, TB Version: %d)\n",
tb_switch_generation_name(sw), regs->vendor_id, regs->device_id,
regs->revision, regs->thunderbolt_version);
tb_dbg(tb, " Max Port Number: %d\n", regs->max_port_number);
tb_dbg(tb, " Config:\n");
tb_dbg(tb,
" Upstream Port Number: %d Depth: %d Route String: %#llx Enabled: %d, PlugEventsDelay: %dms\n",
regs->upstream_port_number, regs->depth,
(((u64) regs->route_hi) << 32) | regs->route_lo,
regs->enabled, regs->plug_events_delay);
tb_dbg(tb, " unknown1: %#x unknown4: %#x\n",
regs->__unknown1, regs->__unknown4);
}
static int tb_switch_reset_host(struct tb_switch *sw)
{
if (sw->generation > 1) {
struct tb_port *port;
tb_switch_for_each_port(sw, port) {
int i, ret;
/*
* For lane adapters we issue downstream port
* reset and clear up path config spaces.
*
* For protocol adapters we disable the path and
* clear path config space one by one (from 8 to
* Max Input HopID of the adapter).
*/
if (tb_port_is_null(port) && !tb_is_upstream_port(port)) {
ret = tb_port_reset(port);
if (ret)
return ret;
} else if (tb_port_is_usb3_down(port) ||
tb_port_is_usb3_up(port)) {
tb_usb3_port_enable(port, false);
} else if (tb_port_is_dpin(port) ||
tb_port_is_dpout(port)) {
tb_dp_port_enable(port, false);
} else if (tb_port_is_pcie_down(port) ||
tb_port_is_pcie_up(port)) {
tb_pci_port_enable(port, false);
} else {
continue;
}
/* Cleanup path config space of protocol adapter */
for (i = TB_PATH_MIN_HOPID;
i <= port->config.max_in_hop_id; i++) {
ret = tb_path_deactivate_hop(port, i);
if (ret)
return ret;
}
}
} else {
struct tb_cfg_result res;
/* Thunderbolt 1 uses the "reset" config space packet */
res.err = tb_sw_write(sw, ((u32 *) &sw->config) + 2,
TB_CFG_SWITCH, 2, 2);
if (res.err)
return res.err;
res = tb_cfg_reset(sw->tb->ctl, tb_route(sw));
if (res.err > 0)
return -EIO;
else if (res.err < 0)
return res.err;
}
return 0;
}
static int tb_switch_reset_device(struct tb_switch *sw)
{
return tb_port_reset(tb_switch_downstream_port(sw));
}
static bool tb_switch_enumerated(struct tb_switch *sw)
{
u32 val;
int ret;
/*
* Read directly from the hardware because we use this also
* during system sleep where sw->config.enabled is already set
* by us.
*/
ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, ROUTER_CS_3, 1);
if (ret)
return false;
return !!(val & ROUTER_CS_3_V);
}
/**
* tb_switch_reset() - Perform reset to the router
* @sw: Router to reset
*
* Issues reset to the router @sw. Can be used for any router. For host
* routers, resets all the downstream ports and cleans up path config
* spaces accordingly. For device routers issues downstream port reset
* through the parent router, so as side effect there will be unplug
* soon after this is finished.
*
* If the router is not enumerated does nothing.
*
* Returns %0 on success or negative errno in case of failure.
*/
int tb_switch_reset(struct tb_switch *sw)
{
int ret;
/*
* We cannot access the port config spaces unless the router is
* already enumerated. If the router is not enumerated it is
* equal to being reset so we can skip that here.
*/
if (!tb_switch_enumerated(sw))
return 0;
tb_sw_dbg(sw, "resetting\n");
if (tb_route(sw))
ret = tb_switch_reset_device(sw);
else
ret = tb_switch_reset_host(sw);
if (ret)
tb_sw_warn(sw, "failed to reset\n");
return ret;
}
/**
* tb_switch_wait_for_bit() - Wait for specified value of bits in offset
* @sw: Router to read the offset value from
* @offset: Offset in the router config space to read from
* @bit: Bit mask in the offset to wait for
* @value: Value of the bits to wait for
* @timeout_msec: Timeout in ms how long to wait
*
* Wait till the specified bits in specified offset reach specified value.
* Returns %0 in case of success, %-ETIMEDOUT if the @value was not reached
* within the given timeout or a negative errno in case of failure.
*/
int tb_switch_wait_for_bit(struct tb_switch *sw, u32 offset, u32 bit,
u32 value, int timeout_msec)
{
ktime_t timeout = ktime_add_ms(ktime_get(), timeout_msec);
do {
u32 val;
int ret;
ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, offset, 1);
if (ret)
return ret;
if ((val & bit) == value)
return 0;
usleep_range(50, 100);
} while (ktime_before(ktime_get(), timeout));
return -ETIMEDOUT;
}
/*
* tb_plug_events_active() - enable/disable plug events on a switch
*
* Also configures a sane plug_events_delay of 255ms.
*
* Return: Returns 0 on success or an error code on failure.
*/
static int tb_plug_events_active(struct tb_switch *sw, bool active)
{
u32 data;
int res;
if (tb_switch_is_icm(sw) || tb_switch_is_usb4(sw))
return 0;
sw->config.plug_events_delay = 0xff;
res = tb_sw_write(sw, ((u32 *) &sw->config) + 4, TB_CFG_SWITCH, 4, 1);
if (res)
return res;
res = tb_sw_read(sw, &data, TB_CFG_SWITCH, sw->cap_plug_events + 1, 1);
if (res)
return res;
if (active) {
data = data & 0xFFFFFF83;
switch (sw->config.device_id) {
case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
break;
default:
/*
* Skip Alpine Ridge, it needs to have vendor
* specific USB hotplug event enabled for the
* internal xHCI to work.
*/
if (!tb_switch_is_alpine_ridge(sw))
data |= TB_PLUG_EVENTS_USB_DISABLE;
}
} else {
data = data | 0x7c;
}
return tb_sw_write(sw, &data, TB_CFG_SWITCH,
sw->cap_plug_events + 1, 1);
}
static ssize_t authorized_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct tb_switch *sw = tb_to_switch(dev);
return sysfs_emit(buf, "%u\n", sw->authorized);
}
static int disapprove_switch(struct device *dev, void *not_used)
{
char *envp[] = { "AUTHORIZED=0", NULL };
struct tb_switch *sw;
sw = tb_to_switch(dev);
if (sw && sw->authorized) {
int ret;
/* First children */
ret = device_for_each_child_reverse(&sw->dev, NULL, disapprove_switch);
if (ret)
return ret;
ret = tb_domain_disapprove_switch(sw->tb, sw);
if (ret)
return ret;
sw->authorized = 0;
kobject_uevent_env(&sw->dev.kobj, KOBJ_CHANGE, envp);
}
return 0;
}
static int tb_switch_set_authorized(struct tb_switch *sw, unsigned int val)
{
char envp_string[13];
int ret = -EINVAL;
char *envp[] = { envp_string, NULL };
if (!mutex_trylock(&sw->tb->lock))
return restart_syscall();
if (!!sw->authorized == !!val)
goto unlock;
switch (val) {
/* Disapprove switch */
case 0:
if (tb_route(sw)) {
ret = disapprove_switch(&sw->dev, NULL);
goto unlock;
}
break;
/* Approve switch */
case 1:
if (sw->key)
ret = tb_domain_approve_switch_key(sw->tb, sw);
else
ret = tb_domain_approve_switch(sw->tb, sw);
break;
/* Challenge switch */
case 2:
if (sw->key)
ret = tb_domain_challenge_switch_key(sw->tb, sw);
break;
default:
break;
}
if (!ret) {
sw->authorized = val;
/*
* Notify status change to the userspace, informing the new
* value of /sys/bus/thunderbolt/devices/.../authorized.
*/
sprintf(envp_string, "AUTHORIZED=%u", sw->authorized);
kobject_uevent_env(&sw->dev.kobj, KOBJ_CHANGE, envp);
}
unlock:
mutex_unlock(&sw->tb->lock);
return ret;
}
static ssize_t authorized_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct tb_switch *sw = tb_to_switch(dev);
unsigned int val;
ssize_t ret;
ret = kstrtouint(buf, 0, &val);
if (ret)
return ret;
if (val > 2)
return -EINVAL;
pm_runtime_get_sync(&sw->dev);
ret = tb_switch_set_authorized(sw, val);
pm_runtime_mark_last_busy(&sw->dev);
pm_runtime_put_autosuspend(&sw->dev);
return ret ? ret : count;
}
static DEVICE_ATTR_RW(authorized);
static ssize_t boot_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct tb_switch *sw = tb_to_switch(dev);
return sysfs_emit(buf, "%u\n", sw->boot);
}
static DEVICE_ATTR_RO(boot);
static ssize_t device_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct tb_switch *sw = tb_to_switch(dev);
return sysfs_emit(buf, "%#x\n", sw->device);
}
static DEVICE_ATTR_RO(device);
static ssize_t
device_name_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct tb_switch *sw = tb_to_switch(dev);
return sysfs_emit(buf, "%s\n", sw->device_name ?: "");
}
static DEVICE_ATTR_RO(device_name);
static ssize_t
generation_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct tb_switch *sw = tb_to_switch(dev);
return sysfs_emit(buf, "%u\n", sw->generation);
}
static DEVICE_ATTR_RO(generation);
static ssize_t key_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct tb_switch *sw = tb_to_switch(dev);
ssize_t ret;
if (!mutex_trylock(&sw->tb->lock))
return restart_syscall();
if (sw->key)
ret = sysfs_emit(buf, "%*phN\n", TB_SWITCH_KEY_SIZE, sw->key);
else
ret = sysfs_emit(buf, "\n");
mutex_unlock(&sw->tb->lock);
return ret;
}
static ssize_t key_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct tb_switch *sw = tb_to_switch(dev);
u8 key[TB_SWITCH_KEY_SIZE];
ssize_t ret = count;
bool clear = false;
if (!strcmp(buf, "\n"))
clear = true;
else if (hex2bin(key, buf, sizeof(key)))
return -EINVAL;
if (!mutex_trylock(&sw->tb->lock))
return restart_syscall();
if (sw->authorized) {
ret = -EBUSY;
} else {
kfree(sw->key);
if (clear) {
sw->key = NULL;
} else {
sw->key = kmemdup(key, sizeof(key), GFP_KERNEL);
if (!sw->key)
ret = -ENOMEM;
}
}
mutex_unlock(&sw->tb->lock);
return ret;
}
static DEVICE_ATTR(key, 0600, key_show, key_store);
static ssize_t speed_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct tb_switch *sw = tb_to_switch(dev);
return sysfs_emit(buf, "%u.0 Gb/s\n", sw->link_speed);
}
/*
* Currently all lanes must run at the same speed but we expose here
* both directions to allow possible asymmetric links in the future.
*/
static DEVICE_ATTR(rx_speed, 0444, speed_show, NULL);
static DEVICE_ATTR(tx_speed, 0444, speed_show, NULL);
static ssize_t rx_lanes_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct tb_switch *sw = tb_to_switch(dev);
unsigned int width;
switch (sw->link_width) {
case TB_LINK_WIDTH_SINGLE:
case TB_LINK_WIDTH_ASYM_TX:
width = 1;
break;
case TB_LINK_WIDTH_DUAL:
width = 2;
break;
case TB_LINK_WIDTH_ASYM_RX:
width = 3;
break;
default:
WARN_ON_ONCE(1);
return -EINVAL;
}
return sysfs_emit(buf, "%u\n", width);
}
static DEVICE_ATTR(rx_lanes, 0444, rx_lanes_show, NULL);
static ssize_t tx_lanes_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct tb_switch *sw = tb_to_switch(dev);
unsigned int width;
switch (sw->link_width) {
case TB_LINK_WIDTH_SINGLE:
case TB_LINK_WIDTH_ASYM_RX:
width = 1;
break;
case TB_LINK_WIDTH_DUAL:
width = 2;
break;
case TB_LINK_WIDTH_ASYM_TX:
width = 3;
break;
default:
WARN_ON_ONCE(1);
return -EINVAL;
}
return sysfs_emit(buf, "%u\n", width);
}
static DEVICE_ATTR(tx_lanes, 0444, tx_lanes_show, NULL);
static ssize_t nvm_authenticate_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct tb_switch *sw = tb_to_switch(dev);
u32 status;
nvm_get_auth_status(sw, &status);
return sysfs_emit(buf, "%#x\n", status);
}
static ssize_t nvm_authenticate_sysfs(struct device *dev, const char *buf,
bool disconnect)
{
struct tb_switch *sw = tb_to_switch(dev);
int val, ret;
pm_runtime_get_sync(&sw->dev);
if (!mutex_trylock(&sw->tb->lock)) {
ret = restart_syscall();
goto exit_rpm;
}
if (sw->no_nvm_upgrade) {
ret = -EOPNOTSUPP;
goto exit_unlock;
}
/* If NVMem devices are not yet added */
if (!sw->nvm) {
ret = -EAGAIN;
goto exit_unlock;
}
ret = kstrtoint(buf, 10, &val);
if (ret)
goto exit_unlock;
/* Always clear the authentication status */
nvm_clear_auth_status(sw);
if (val > 0) {
if (val == AUTHENTICATE_ONLY) {
if (disconnect)
ret = -EINVAL;
else
ret = nvm_authenticate(sw, true);
} else {
if (!sw->nvm->flushed) {
if (!sw->nvm->buf) {
ret = -EINVAL;
goto exit_unlock;
}
ret = nvm_validate_and_write(sw);
if (ret || val == WRITE_ONLY)
goto exit_unlock;
}
if (val == WRITE_AND_AUTHENTICATE) {
if (disconnect)
ret = tb_lc_force_power(sw);
else
ret = nvm_authenticate(sw, false);
}
}
}
exit_unlock:
mutex_unlock(&sw->tb->lock);
exit_rpm:
pm_runtime_mark_last_busy(&sw->dev);
pm_runtime_put_autosuspend(&sw->dev);
return ret;
}
static ssize_t nvm_authenticate_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
int ret = nvm_authenticate_sysfs(dev, buf, false);
if (ret)
return ret;
return count;
}
static DEVICE_ATTR_RW(nvm_authenticate);
static ssize_t nvm_authenticate_on_disconnect_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return nvm_authenticate_show(dev, attr, buf);
}
static ssize_t nvm_authenticate_on_disconnect_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
int ret;
ret = nvm_authenticate_sysfs(dev, buf, true);
return ret ? ret : count;
}
static DEVICE_ATTR_RW(nvm_authenticate_on_disconnect);
static ssize_t nvm_version_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct tb_switch *sw = tb_to_switch(dev);
int ret;
if (!mutex_trylock(&sw->tb->lock))
return restart_syscall();
if (sw->safe_mode)
ret = -ENODATA;
else if (!sw->nvm)
ret = -EAGAIN;
else
ret = sysfs_emit(buf, "%x.%x\n", sw->nvm->major, sw->nvm->minor);
mutex_unlock(&sw->tb->lock);
return ret;
}
static DEVICE_ATTR_RO(nvm_version);
static ssize_t vendor_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct tb_switch *sw = tb_to_switch(dev);
return sysfs_emit(buf, "%#x\n", sw->vendor);
}
static DEVICE_ATTR_RO(vendor);
static ssize_t
vendor_name_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct tb_switch *sw = tb_to_switch(dev);
return sysfs_emit(buf, "%s\n", sw->vendor_name ?: "");
}
static DEVICE_ATTR_RO(vendor_name);
static ssize_t unique_id_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct tb_switch *sw = tb_to_switch(dev);
return sysfs_emit(buf, "%pUb\n", sw->uuid);
}
static DEVICE_ATTR_RO(unique_id);
static struct attribute *switch_attrs[] = {
&dev_attr_authorized.attr,
&dev_attr_boot.attr,
&dev_attr_device.attr,
&dev_attr_device_name.attr,
&dev_attr_generation.attr,
&dev_attr_key.attr,
&dev_attr_nvm_authenticate.attr,
&dev_attr_nvm_authenticate_on_disconnect.attr,
&dev_attr_nvm_version.attr,
&dev_attr_rx_speed.attr,
&dev_attr_rx_lanes.attr,
&dev_attr_tx_speed.attr,
&dev_attr_tx_lanes.attr,
&dev_attr_vendor.attr,
&dev_attr_vendor_name.attr,
&dev_attr_unique_id.attr,
NULL,
};
static umode_t switch_attr_is_visible(struct kobject *kobj,
struct attribute *attr, int n)
{
struct device *dev = kobj_to_dev(kobj);
struct tb_switch *sw = tb_to_switch(dev);
if (attr == &dev_attr_authorized.attr) {
if (sw->tb->security_level == TB_SECURITY_NOPCIE ||
sw->tb->security_level == TB_SECURITY_DPONLY)
return 0;
} else if (attr == &dev_attr_device.attr) {
if (!sw->device)
return 0;
} else if (attr == &dev_attr_device_name.attr) {
if (!sw->device_name)
return 0;
} else if (attr == &dev_attr_vendor.attr) {
if (!sw->vendor)
return 0;
} else if (attr == &dev_attr_vendor_name.attr) {
if (!sw->vendor_name)
return 0;
} else if (attr == &dev_attr_key.attr) {
if (tb_route(sw) &&
sw->tb->security_level == TB_SECURITY_SECURE &&
sw->security_level == TB_SECURITY_SECURE)
return attr->mode;
return 0;
} else if (attr == &dev_attr_rx_speed.attr ||
attr == &dev_attr_rx_lanes.attr ||
attr == &dev_attr_tx_speed.attr ||
attr == &dev_attr_tx_lanes.attr) {
if (tb_route(sw))
return attr->mode;
return 0;
} else if (attr == &dev_attr_nvm_authenticate.attr) {
if (nvm_upgradeable(sw))
return attr->mode;
return 0;
} else if (attr == &dev_attr_nvm_version.attr) {
if (nvm_readable(sw))
return attr->mode;
return 0;
} else if (attr == &dev_attr_boot.attr) {
if (tb_route(sw))
return attr->mode;
return 0;
} else if (attr == &dev_attr_nvm_authenticate_on_disconnect.attr) {
if (sw->quirks & QUIRK_FORCE_POWER_LINK_CONTROLLER)
return attr->mode;
return 0;
}
return sw->safe_mode ? 0 : attr->mode;
}
static const struct attribute_group switch_group = {
.is_visible = switch_attr_is_visible,
.attrs = switch_attrs,
};
static const struct attribute_group *switch_groups[] = {
&switch_group,
NULL,
};
static void tb_switch_release(struct device *dev)
{
struct tb_switch *sw = tb_to_switch(dev);
struct tb_port *port;
dma_port_free(sw->dma_port);
tb_switch_for_each_port(sw, port) {
ida_destroy(&port->in_hopids);
ida_destroy(&port->out_hopids);
}
kfree(sw->uuid);
kfree(sw->device_name);
kfree(sw->vendor_name);
kfree(sw->ports);
kfree(sw->drom);
kfree(sw->key);
kfree(sw);
}
static int tb_switch_uevent(const struct device *dev, struct kobj_uevent_env *env)
{
const struct tb_switch *sw = tb_to_switch(dev);
const char *type;
if (tb_switch_is_usb4(sw)) {
if (add_uevent_var(env, "USB4_VERSION=%u.0",
usb4_switch_version(sw)))
return -ENOMEM;
}
if (!tb_route(sw)) {
type = "host";
} else {
const struct tb_port *port;
bool hub = false;
/* Device is hub if it has any downstream ports */
tb_switch_for_each_port(sw, port) {
if (!port->disabled && !tb_is_upstream_port(port) &&
tb_port_is_null(port)) {
hub = true;
break;
}
}
type = hub ? "hub" : "device";
}
if (add_uevent_var(env, "USB4_TYPE=%s", type))
return -ENOMEM;
return 0;
}
/*
* Currently only need to provide the callbacks. Everything else is handled
* in the connection manager.
*/
static int __maybe_unused tb_switch_runtime_suspend(struct device *dev)
{
struct tb_switch *sw = tb_to_switch(dev);
const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;
if (cm_ops->runtime_suspend_switch)
return cm_ops->runtime_suspend_switch(sw);
return 0;
}
static int __maybe_unused tb_switch_runtime_resume(struct device *dev)
{
struct tb_switch *sw = tb_to_switch(dev);
const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;
if (cm_ops->runtime_resume_switch)
return cm_ops->runtime_resume_switch(sw);
return 0;
}
static const struct dev_pm_ops tb_switch_pm_ops = {
SET_RUNTIME_PM_OPS(tb_switch_runtime_suspend, tb_switch_runtime_resume,
NULL)
};
const struct device_type tb_switch_type = {
.name = "thunderbolt_device",
.release = tb_switch_release,
.uevent = tb_switch_uevent,
.pm = &tb_switch_pm_ops,
};
static int tb_switch_get_generation(struct tb_switch *sw)
{
if (tb_switch_is_usb4(sw))
return 4;
if (sw->config.vendor_id == PCI_VENDOR_ID_INTEL) {
switch (sw->config.device_id) {
case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
case PCI_DEVICE_ID_INTEL_LIGHT_PEAK:
case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_2C:
case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C:
case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_2C_BRIDGE:
case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_4C_BRIDGE:
return 1;
case PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_BRIDGE:
case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_BRIDGE:
case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_BRIDGE:
return 2;
case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_BRIDGE:
case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_BRIDGE:
case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_BRIDGE:
case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE:
case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE:
case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_BRIDGE:
case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_BRIDGE:
case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_DD_BRIDGE:
case PCI_DEVICE_ID_INTEL_ICL_NHI0:
case PCI_DEVICE_ID_INTEL_ICL_NHI1:
return 3;
}
}
/*
* For unknown switches assume generation to be 1 to be on the
* safe side.
*/
tb_sw_warn(sw, "unsupported switch device id %#x\n",
sw->config.device_id);
return 1;
}
static bool tb_switch_exceeds_max_depth(const struct tb_switch *sw, int depth)
{
int max_depth;
if (tb_switch_is_usb4(sw) ||
(sw->tb->root_switch && tb_switch_is_usb4(sw->tb->root_switch)))
max_depth = USB4_SWITCH_MAX_DEPTH;
else
max_depth = TB_SWITCH_MAX_DEPTH;
return depth > max_depth;
}
/**
* tb_switch_alloc() - allocate a switch
* @tb: Pointer to the owning domain
* @parent: Parent device for this switch
* @route: Route string for this switch
*
* Allocates and initializes a switch. Will not upload configuration to
* the switch. For that you need to call tb_switch_configure()
* separately. The returned switch should be released by calling
* tb_switch_put().
*
* Return: Pointer to the allocated switch or ERR_PTR() in case of
* failure.
*/
struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent,
u64 route)
{
struct tb_switch *sw;
int upstream_port;
int i, ret, depth;
/* Unlock the downstream port so we can access the switch below */
if (route) {
struct tb_switch *parent_sw = tb_to_switch(parent);
struct tb_port *down;
down = tb_port_at(route, parent_sw);
tb_port_unlock(down);
}
depth = tb_route_length(route);
upstream_port = tb_cfg_get_upstream_port(tb->ctl, route);
if (upstream_port < 0)
return ERR_PTR(upstream_port);
sw = kzalloc(sizeof(*sw), GFP_KERNEL);
if (!sw)
return ERR_PTR(-ENOMEM);
sw->tb = tb;
ret = tb_cfg_read(tb->ctl, &sw->config, route, 0, TB_CFG_SWITCH, 0, 5);
if (ret)
goto err_free_sw_ports;
sw->generation = tb_switch_get_generation(sw);
tb_dbg(tb, "current switch config:\n");
tb_dump_switch(tb, sw);
/* configure switch */
sw->config.upstream_port_number = upstream_port;
sw->config.depth = depth;
sw->config.route_hi = upper_32_bits(route);
sw->config.route_lo = lower_32_bits(route);
sw->config.enabled = 0;
/* Make sure we do not exceed maximum topology limit */
if (tb_switch_exceeds_max_depth(sw, depth)) {
ret = -EADDRNOTAVAIL;
goto err_free_sw_ports;
}
/* initialize ports */
sw->ports = kcalloc(sw->config.max_port_number + 1, sizeof(*sw->ports),
GFP_KERNEL);
if (!sw->ports) {
ret = -ENOMEM;
goto err_free_sw_ports;
}
for (i = 0; i <= sw->config.max_port_number; i++) {
/* minimum setup for tb_find_cap and tb_drom_read to work */
sw->ports[i].sw = sw;
sw->ports[i].port = i;
/* Control port does not need HopID allocation */
if (i) {
ida_init(&sw->ports[i].in_hopids);
ida_init(&sw->ports[i].out_hopids);
}
}
ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_PLUG_EVENTS);
if (ret > 0)
sw->cap_plug_events = ret;
ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_TIME2);
if (ret > 0)
sw->cap_vsec_tmu = ret;
ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_LINK_CONTROLLER);
if (ret > 0)
sw->cap_lc = ret;
ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_CP_LP);
if (ret > 0)
sw->cap_lp = ret;
/* Root switch is always authorized */
if (!route)
sw->authorized = true;
device_initialize(&sw->dev);
sw->dev.parent = parent;
sw->dev.bus = &tb_bus_type;
sw->dev.type = &tb_switch_type;
sw->dev.groups = switch_groups;
dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));
return sw;
err_free_sw_ports:
kfree(sw->ports);
kfree(sw);
return ERR_PTR(ret);
}
/**
* tb_switch_alloc_safe_mode() - allocate a switch that is in safe mode
* @tb: Pointer to the owning domain
* @parent: Parent device for this switch
* @route: Route string for this switch
*
* This creates a switch in safe mode. This means the switch pretty much
* lacks all capabilities except DMA configuration port before it is
* flashed with a valid NVM firmware.
*
* The returned switch must be released by calling tb_switch_put().
*
* Return: Pointer to the allocated switch or ERR_PTR() in case of failure
*/
struct tb_switch *
tb_switch_alloc_safe_mode(struct tb *tb, struct device *parent, u64 route)
{
struct tb_switch *sw;
sw = kzalloc(sizeof(*sw), GFP_KERNEL);
if (!sw)
return ERR_PTR(-ENOMEM);
sw->tb = tb;
sw->config.depth = tb_route_length(route);
sw->config.route_hi = upper_32_bits(route);
sw->config.route_lo = lower_32_bits(route);
sw->safe_mode = true;
device_initialize(&sw->dev);
sw->dev.parent = parent;
sw->dev.bus = &tb_bus_type;
sw->dev.type = &tb_switch_type;
sw->dev.groups = switch_groups;
dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));
return sw;
}
/**
* tb_switch_configure() - Uploads configuration to the switch
* @sw: Switch to configure
*
* Call this function before the switch is added to the system. It will
* upload configuration to the switch and makes it available for the
* connection manager to use. Can be called to the switch again after
* resume from low power states to re-initialize it.
*
* Return: %0 in case of success and negative errno in case of failure
*/
int tb_switch_configure(struct tb_switch *sw)
{
struct tb *tb = sw->tb;
u64 route;
int ret;
route = tb_route(sw);
tb_dbg(tb, "%s Switch at %#llx (depth: %d, up port: %d)\n",
sw->config.enabled ? "restoring" : "initializing", route,
tb_route_length(route), sw->config.upstream_port_number);
sw->config.enabled = 1;
if (tb_switch_is_usb4(sw)) {
/*
* For USB4 devices, we need to program the CM version
* accordingly so that it knows to expose all the
* additional capabilities. Program it according to USB4
* version to avoid changing existing (v1) routers behaviour.
*/
if (usb4_switch_version(sw) < 2)
sw->config.cmuv = ROUTER_CS_4_CMUV_V1;
else
sw->config.cmuv = ROUTER_CS_4_CMUV_V2;
sw->config.plug_events_delay = 0xa;
/* Enumerate the switch */
ret = tb_sw_write(sw, (u32 *)&sw->config + 1, TB_CFG_SWITCH,
ROUTER_CS_1, 4);
if (ret)
return ret;
ret = usb4_switch_setup(sw);
} else {
if (sw->config.vendor_id != PCI_VENDOR_ID_INTEL)
tb_sw_warn(sw, "unknown switch vendor id %#x\n",
sw->config.vendor_id);
if (!sw->cap_plug_events) {
tb_sw_warn(sw, "cannot find TB_VSE_CAP_PLUG_EVENTS aborting\n");
return -ENODEV;
}
/* Enumerate the switch */
ret = tb_sw_write(sw, (u32 *)&sw->config + 1, TB_CFG_SWITCH,
ROUTER_CS_1, 3);
}
if (ret)
return ret;
return tb_plug_events_active(sw, true);
}
/**
* tb_switch_configuration_valid() - Set the tunneling configuration to be valid
* @sw: Router to configure
*
* Needs to be called before any tunnels can be setup through the
* router. Can be called to any router.
*
* Returns %0 in success and negative errno otherwise.
*/
int tb_switch_configuration_valid(struct tb_switch *sw)
{
if (tb_switch_is_usb4(sw))
return usb4_switch_configuration_valid(sw);
return 0;
}
static int tb_switch_set_uuid(struct tb_switch *sw)
{
bool uid = false;
u32 uuid[4];
int ret;
if (sw->uuid)
return 0;
if (tb_switch_is_usb4(sw)) {
ret = usb4_switch_read_uid(sw, &sw->uid);
if (ret)
return ret;
uid = true;
} else {
/*
* The newer controllers include fused UUID as part of
* link controller specific registers
*/
ret = tb_lc_read_uuid(sw, uuid);
if (ret) {
if (ret != -EINVAL)
return ret;
uid = true;
}
}
if (uid) {
/*
* ICM generates UUID based on UID and fills the upper
* two words with ones. This is not strictly following
* UUID format but we want to be compatible with it so
* we do the same here.
*/
uuid[0] = sw->uid & 0xffffffff;
uuid[1] = (sw->uid >> 32) & 0xffffffff;
uuid[2] = 0xffffffff;
uuid[3] = 0xffffffff;
}
sw->uuid = kmemdup(uuid, sizeof(uuid), GFP_KERNEL);
if (!sw->uuid)
return -ENOMEM;
return 0;
}
static int tb_switch_add_dma_port(struct tb_switch *sw)
{
u32 status;
int ret;
switch (sw->generation) {
case 2:
/* Only root switch can be upgraded */
if (tb_route(sw))
return 0;
fallthrough;
case 3:
case 4:
ret = tb_switch_set_uuid(sw);
if (ret)
return ret;
break;
default:
/*
* DMA port is the only thing available when the switch
* is in safe mode.
*/
if (!sw->safe_mode)
return 0;
break;
}
if (sw->no_nvm_upgrade)
return 0;
if (tb_switch_is_usb4(sw)) {
ret = usb4_switch_nvm_authenticate_status(sw, &status);
if (ret)
return ret;
if (status) {
tb_sw_info(sw, "switch flash authentication failed\n");
nvm_set_auth_status(sw, status);
}
return 0;
}
/* Root switch DMA port requires running firmware */
if (!tb_route(sw) && !tb_switch_is_icm(sw))
return 0;
sw->dma_port = dma_port_alloc(sw);
if (!sw->dma_port)
return 0;
/*
* If there is status already set then authentication failed
* when the dma_port_flash_update_auth() returned. Power cycling
* is not needed (it was done already) so only thing we do here
* is to unblock runtime PM of the root port.
*/
nvm_get_auth_status(sw, &status);
if (status) {
if (!tb_route(sw))
nvm_authenticate_complete_dma_port(sw);
return 0;
}
/*
* Check status of the previous flash authentication. If there
* is one we need to power cycle the switch in any case to make
* it functional again.
*/
ret = dma_port_flash_update_auth_status(sw->dma_port, &status);
if (ret <= 0)
return ret;
/* Now we can allow root port to suspend again */
if (!tb_route(sw))
nvm_authenticate_complete_dma_port(sw);
if (status) {
tb_sw_info(sw, "switch flash authentication failed\n");
nvm_set_auth_status(sw, status);
}
tb_sw_info(sw, "power cycling the switch now\n");
dma_port_power_cycle(sw->dma_port);
/*
* We return error here which causes the switch adding failure.
* It should appear back after power cycle is complete.
*/
return -ESHUTDOWN;
}
static void tb_switch_default_link_ports(struct tb_switch *sw)
{
int i;
for (i = 1; i <= sw->config.max_port_number; i++) {
struct tb_port *port = &sw->ports[i];
struct tb_port *subordinate;
if (!tb_port_is_null(port))
continue;
/* Check for the subordinate port */
if (i == sw->config.max_port_number ||
!tb_port_is_null(&sw->ports[i + 1]))
continue;
/* Link them if not already done so (by DROM) */
subordinate = &sw->ports[i + 1];
if (!port->dual_link_port && !subordinate->dual_link_port) {
port->link_nr = 0;
port->dual_link_port = subordinate;
subordinate->link_nr = 1;
subordinate->dual_link_port = port;
tb_sw_dbg(sw, "linked ports %d <-> %d\n",
port->port, subordinate->port);
}
}
}
static bool tb_switch_lane_bonding_possible(struct tb_switch *sw)
{
const struct tb_port *up = tb_upstream_port(sw);
if (!up->dual_link_port || !up->dual_link_port->remote)
return false;
if (tb_switch_is_usb4(sw))
return usb4_switch_lane_bonding_possible(sw);
return tb_lc_lane_bonding_possible(sw);
}
static int tb_switch_update_link_attributes(struct tb_switch *sw)
{
struct tb_port *up;
bool change = false;
int ret;
if (!tb_route(sw) || tb_switch_is_icm(sw))
return 0;
up = tb_upstream_port(sw);
ret = tb_port_get_link_speed(up);
if (ret < 0)
return ret;
if (sw->link_speed != ret)
change = true;
sw->link_speed = ret;
ret = tb_port_get_link_width(up);
if (ret < 0)
return ret;
if (sw->link_width != ret)
change = true;
sw->link_width = ret;
/* Notify userspace that there is possible link attribute change */
if (device_is_registered(&sw->dev) && change)
kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE);
return 0;
}
/* Must be called after tb_switch_update_link_attributes() */
static void tb_switch_link_init(struct tb_switch *sw)
{
struct tb_port *up, *down;
bool bonded;
if (!tb_route(sw) || tb_switch_is_icm(sw))
return;
tb_sw_dbg(sw, "current link speed %u.0 Gb/s\n", sw->link_speed);
tb_sw_dbg(sw, "current link width %s\n", tb_width_name(sw->link_width));
bonded = sw->link_width >= TB_LINK_WIDTH_DUAL;
/*
* Gen 4 links come up as bonded so update the port structures
* accordingly.
*/
up = tb_upstream_port(sw);
down = tb_switch_downstream_port(sw);
up->bonded = bonded;
if (up->dual_link_port)
up->dual_link_port->bonded = bonded;
tb_port_update_credits(up);
down->bonded = bonded;
if (down->dual_link_port)
down->dual_link_port->bonded = bonded;
tb_port_update_credits(down);
if (tb_port_get_link_generation(up) < 4)
return;
/*
* Set the Gen 4 preferred link width. This is what the router
* prefers when the link is brought up. If the router does not
* support asymmetric link configuration, this also will be set
* to TB_LINK_WIDTH_DUAL.
*/
sw->preferred_link_width = sw->link_width;
tb_sw_dbg(sw, "preferred link width %s\n",
tb_width_name(sw->preferred_link_width));
}
/**
* tb_switch_lane_bonding_enable() - Enable lane bonding
* @sw: Switch to enable lane bonding
*
* Connection manager can call this function to enable lane bonding of a
* switch. If conditions are correct and both switches support the feature,
* lanes are bonded. It is safe to call this to any switch.
*/
static int tb_switch_lane_bonding_enable(struct tb_switch *sw)
{
struct tb_port *up, *down;
unsigned int width;
int ret;
if (!tb_switch_lane_bonding_possible(sw))
return 0;
up = tb_upstream_port(sw);
down = tb_switch_downstream_port(sw);
if (!tb_port_width_supported(up, TB_LINK_WIDTH_DUAL) ||
!tb_port_width_supported(down, TB_LINK_WIDTH_DUAL))
return 0;
/*
* Both lanes need to be in CL0. Here we assume lane 0 already be in
* CL0 and check just for lane 1.
*/
if (tb_wait_for_port(down->dual_link_port, false) <= 0)
return -ENOTCONN;
ret = tb_port_lane_bonding_enable(up);
if (ret) {
tb_port_warn(up, "failed to enable lane bonding\n");
return ret;
}
ret = tb_port_lane_bonding_enable(down);
if (ret) {
tb_port_warn(down, "failed to enable lane bonding\n");
tb_port_lane_bonding_disable(up);
return ret;
}
/* Any of the widths are all bonded */
width = TB_LINK_WIDTH_DUAL | TB_LINK_WIDTH_ASYM_TX |
TB_LINK_WIDTH_ASYM_RX;
return tb_port_wait_for_link_width(down, width, 100);
}
/**
* tb_switch_lane_bonding_disable() - Disable lane bonding
* @sw: Switch whose lane bonding to disable
*
* Disables lane bonding between @sw and parent. This can be called even
* if lanes were not bonded originally.
*/
static int tb_switch_lane_bonding_disable(struct tb_switch *sw)
{
struct tb_port *up, *down;
int ret;
up = tb_upstream_port(sw);
if (!up->bonded)
return 0;
/*
* If the link is Gen 4 there is no way to switch the link to
* two single lane links so avoid that here. Also don't bother
* if the link is not up anymore (sw is unplugged).
*/
ret = tb_port_get_link_generation(up);
if (ret < 0)
return ret;
if (ret >= 4)
return -EOPNOTSUPP;
down = tb_switch_downstream_port(sw);
tb_port_lane_bonding_disable(up);
tb_port_lane_bonding_disable(down);
/*
* It is fine if we get other errors as the router might have
* been unplugged.
*/
return tb_port_wait_for_link_width(down, TB_LINK_WIDTH_SINGLE, 100);
}
/* Note updating sw->link_width done in tb_switch_update_link_attributes() */
static int tb_switch_asym_enable(struct tb_switch *sw, enum tb_link_width width)
{
struct tb_port *up, *down, *port;
enum tb_link_width down_width;
int ret;
up = tb_upstream_port(sw);
down = tb_switch_downstream_port(sw);
if (width == TB_LINK_WIDTH_ASYM_TX) {
down_width = TB_LINK_WIDTH_ASYM_RX;
port = down;
} else {
down_width = TB_LINK_WIDTH_ASYM_TX;
port = up;
}
ret = tb_port_set_link_width(up, width);
if (ret)
return ret;
ret = tb_port_set_link_width(down, down_width);
if (ret)
return ret;
/*
* Initiate the change in the router that one of its TX lanes is
* changing to RX but do so only if there is an actual change.
*/
if (sw->link_width != width) {
ret = usb4_port_asym_start(port);
if (ret)
return ret;
ret = tb_port_wait_for_link_width(up, width, 100);
if (ret)
return ret;
}
return 0;
}
/* Note updating sw->link_width done in tb_switch_update_link_attributes() */
static int tb_switch_asym_disable(struct tb_switch *sw)
{
struct tb_port *up, *down;
int ret;
up = tb_upstream_port(sw);
down = tb_switch_downstream_port(sw);
ret = tb_port_set_link_width(up, TB_LINK_WIDTH_DUAL);
if (ret)
return ret;
ret = tb_port_set_link_width(down, TB_LINK_WIDTH_DUAL);
if (ret)
return ret;
/*
* Initiate the change in the router that has three TX lanes and
* is changing one of its TX lanes to RX but only if there is a
* change in the link width.
*/
if (sw->link_width > TB_LINK_WIDTH_DUAL) {
if (sw->link_width == TB_LINK_WIDTH_ASYM_TX)
ret = usb4_port_asym_start(up);
else
ret = usb4_port_asym_start(down);
if (ret)
return ret;
ret = tb_port_wait_for_link_width(up, TB_LINK_WIDTH_DUAL, 100);
if (ret)
return ret;
}
return 0;
}
/**
* tb_switch_set_link_width() - Configure router link width
* @sw: Router to configure
* @width: The new link width
*
* Set device router link width to @width from router upstream port
* perspective. Supports also asymmetric links if the routers boths side
* of the link supports it.
*
* Does nothing for host router.
*
* Returns %0 in case of success, negative errno otherwise.
*/
int tb_switch_set_link_width(struct tb_switch *sw, enum tb_link_width width)
{
struct tb_port *up, *down;
int ret = 0;
if (!tb_route(sw))
return 0;
up = tb_upstream_port(sw);
down = tb_switch_downstream_port(sw);
switch (width) {
case TB_LINK_WIDTH_SINGLE:
ret = tb_switch_lane_bonding_disable(sw);
break;
case TB_LINK_WIDTH_DUAL:
if (sw->link_width == TB_LINK_WIDTH_ASYM_TX ||
sw->link_width == TB_LINK_WIDTH_ASYM_RX) {
ret = tb_switch_asym_disable(sw);
if (ret)
break;
}
ret = tb_switch_lane_bonding_enable(sw);
break;
case TB_LINK_WIDTH_ASYM_TX:
case TB_LINK_WIDTH_ASYM_RX:
ret = tb_switch_asym_enable(sw, width);
break;
}
switch (ret) {
case 0:
break;
case -ETIMEDOUT:
tb_sw_warn(sw, "timeout changing link width\n");
return ret;
case -ENOTCONN:
case -EOPNOTSUPP:
case -ENODEV:
return ret;
default:
tb_sw_dbg(sw, "failed to change link width: %d\n", ret);
return ret;
}
tb_port_update_credits(down);
tb_port_update_credits(up);
tb_switch_update_link_attributes(sw);
tb_sw_dbg(sw, "link width set to %s\n", tb_width_name(width));
return ret;
}
/**
* tb_switch_configure_link() - Set link configured
* @sw: Switch whose link is configured
*
* Sets the link upstream from @sw configured (from both ends) so that
* it will not be disconnected when the domain exits sleep. Can be
* called for any switch.
*
* It is recommended that this is called after lane bonding is enabled.
*
* Returns %0 on success and negative errno in case of error.
*/
int tb_switch_configure_link(struct tb_switch *sw)
{
struct tb_port *up, *down;
int ret;
if (!tb_route(sw) || tb_switch_is_icm(sw))
return 0;
up = tb_upstream_port(sw);
if (tb_switch_is_usb4(up->sw))
ret = usb4_port_configure(up);
else
ret = tb_lc_configure_port(up);
if (ret)
return ret;
down = up->remote;
if (tb_switch_is_usb4(down->sw))
return usb4_port_configure(down);
return tb_lc_configure_port(down);
}
/**
* tb_switch_unconfigure_link() - Unconfigure link
* @sw: Switch whose link is unconfigured
*
* Sets the link unconfigured so the @sw will be disconnected if the
* domain exists sleep.
*/
void tb_switch_unconfigure_link(struct tb_switch *sw)
{
struct tb_port *up, *down;
if (!tb_route(sw) || tb_switch_is_icm(sw))
return;
/*
* Unconfigure downstream port so that wake-on-connect can be
* configured after router unplug. No need to unconfigure upstream port
* since its router is unplugged.
*/
up = tb_upstream_port(sw);
down = up->remote;
if (tb_switch_is_usb4(down->sw))
usb4_port_unconfigure(down);
else
tb_lc_unconfigure_port(down);
if (sw->is_unplugged)
return;
up = tb_upstream_port(sw);
if (tb_switch_is_usb4(up->sw))
usb4_port_unconfigure(up);
else
tb_lc_unconfigure_port(up);
}
static void tb_switch_credits_init(struct tb_switch *sw)
{
if (tb_switch_is_icm(sw))
return;
if (!tb_switch_is_usb4(sw))
return;
if (usb4_switch_credits_init(sw))
tb_sw_info(sw, "failed to determine preferred buffer allocation, using defaults\n");
}
static int tb_switch_port_hotplug_enable(struct tb_switch *sw)
{
struct tb_port *port;
if (tb_switch_is_icm(sw))
return 0;
tb_switch_for_each_port(sw, port) {
int res;
if (!port->cap_usb4)
continue;
res = usb4_port_hotplug_enable(port);
if (res)
return res;
}
return 0;
}
/**
* tb_switch_add() - Add a switch to the domain
* @sw: Switch to add
*
* This is the last step in adding switch to the domain. It will read
* identification information from DROM and initializes ports so that
* they can be used to connect other switches. The switch will be
* exposed to the userspace when this function successfully returns. To
* remove and release the switch, call tb_switch_remove().
*
* Return: %0 in case of success and negative errno in case of failure
*/
int tb_switch_add(struct tb_switch *sw)
{
int i, ret;
/*
* Initialize DMA control port now before we read DROM. Recent
* host controllers have more complete DROM on NVM that includes
* vendor and model identification strings which we then expose
* to the userspace. NVM can be accessed through DMA
* configuration based mailbox.
*/
ret = tb_switch_add_dma_port(sw);
if (ret) {
dev_err(&sw->dev, "failed to add DMA port\n");
return ret;
}
if (!sw->safe_mode) {
tb_switch_credits_init(sw);
/* read drom */
ret = tb_drom_read(sw);
if (ret)
dev_warn(&sw->dev, "reading DROM failed: %d\n", ret);
tb_sw_dbg(sw, "uid: %#llx\n", sw->uid);
ret = tb_switch_set_uuid(sw);
if (ret) {
dev_err(&sw->dev, "failed to set UUID\n");
return ret;
}
for (i = 0; i <= sw->config.max_port_number; i++) {
if (sw->ports[i].disabled) {
tb_port_dbg(&sw->ports[i], "disabled by eeprom\n");
continue;
}
ret = tb_init_port(&sw->ports[i]);
if (ret) {
dev_err(&sw->dev, "failed to initialize port %d\n", i);
return ret;
}
}
tb_check_quirks(sw);
tb_switch_default_link_ports(sw);
ret = tb_switch_update_link_attributes(sw);
if (ret)
return ret;
tb_switch_link_init(sw);
ret = tb_switch_clx_init(sw);
if (ret)
return ret;
ret = tb_switch_tmu_init(sw);
if (ret)
return ret;
}
ret = tb_switch_port_hotplug_enable(sw);
if (ret)
return ret;
ret = device_add(&sw->dev);
if (ret) {
dev_err(&sw->dev, "failed to add device: %d\n", ret);
return ret;
}
if (tb_route(sw)) {
dev_info(&sw->dev, "new device found, vendor=%#x device=%#x\n",
sw->vendor, sw->device);
if (sw->vendor_name && sw->device_name)
dev_info(&sw->dev, "%s %s\n", sw->vendor_name,
sw->device_name);
}
ret = usb4_switch_add_ports(sw);
if (ret) {
dev_err(&sw->dev, "failed to add USB4 ports\n");
goto err_del;
}
ret = tb_switch_nvm_add(sw);
if (ret) {
dev_err(&sw->dev, "failed to add NVM devices\n");
goto err_ports;
}
/*
* Thunderbolt routers do not generate wakeups themselves but
* they forward wakeups from tunneled protocols, so enable it
* here.
*/
device_init_wakeup(&sw->dev, true);
pm_runtime_set_active(&sw->dev);
if (sw->rpm) {
pm_runtime_set_autosuspend_delay(&sw->dev, TB_AUTOSUSPEND_DELAY);
pm_runtime_use_autosuspend(&sw->dev);
pm_runtime_mark_last_busy(&sw->dev);
pm_runtime_enable(&sw->dev);
pm_request_autosuspend(&sw->dev);
}
tb_switch_debugfs_init(sw);
return 0;
err_ports:
usb4_switch_remove_ports(sw);
err_del:
device_del(&sw->dev);
return ret;
}
/**
* tb_switch_remove() - Remove and release a switch
* @sw: Switch to remove
*
* This will remove the switch from the domain and release it after last
* reference count drops to zero. If there are switches connected below
* this switch, they will be removed as well.
*/
void tb_switch_remove(struct tb_switch *sw)
{
struct tb_port *port;
tb_switch_debugfs_remove(sw);
if (sw->rpm) {
pm_runtime_get_sync(&sw->dev);
pm_runtime_disable(&sw->dev);
}
/* port 0 is the switch itself and never has a remote */
tb_switch_for_each_port(sw, port) {
if (tb_port_has_remote(port)) {
tb_switch_remove(port->remote->sw);
port->remote = NULL;
} else if (port->xdomain) {
port->xdomain->is_unplugged = true;
tb_xdomain_remove(port->xdomain);
port->xdomain = NULL;
}
/* Remove any downstream retimers */
tb_retimer_remove_all(port);
}
if (!sw->is_unplugged)
tb_plug_events_active(sw, false);
tb_switch_nvm_remove(sw);
usb4_switch_remove_ports(sw);
if (tb_route(sw))
dev_info(&sw->dev, "device disconnected\n");
device_unregister(&sw->dev);
}
/**
* tb_sw_set_unplugged() - set is_unplugged on switch and downstream switches
* @sw: Router to mark unplugged
*/
void tb_sw_set_unplugged(struct tb_switch *sw)
{
struct tb_port *port;
if (sw == sw->tb->root_switch) {
tb_sw_WARN(sw, "cannot unplug root switch\n");
return;
}
if (sw->is_unplugged) {
tb_sw_WARN(sw, "is_unplugged already set\n");
return;
}
sw->is_unplugged = true;
tb_switch_for_each_port(sw, port) {
if (tb_port_has_remote(port))
tb_sw_set_unplugged(port->remote->sw);
else if (port->xdomain)
port->xdomain->is_unplugged = true;
}
}
static int tb_switch_set_wake(struct tb_switch *sw, unsigned int flags)
{
if (flags)
tb_sw_dbg(sw, "enabling wakeup: %#x\n", flags);
else
tb_sw_dbg(sw, "disabling wakeup\n");
if (tb_switch_is_usb4(sw))
return usb4_switch_set_wake(sw, flags);
return tb_lc_set_wake(sw, flags);
}
static void tb_switch_check_wakes(struct tb_switch *sw)
{
if (device_may_wakeup(&sw->dev)) {
if (tb_switch_is_usb4(sw))
usb4_switch_check_wakes(sw);
}
}
/**
* tb_switch_resume() - Resume a switch after sleep
* @sw: Switch to resume
* @runtime: Is this resume from runtime suspend or system sleep
*
* Resumes and re-enumerates router (and all its children), if still plugged
* after suspend. Don't enumerate device router whose UID was changed during
* suspend. If this is resume from system sleep, notifies PM core about the
* wakes occurred during suspend. Disables all wakes, except USB4 wake of
* upstream port for USB4 routers that shall be always enabled.
*/
int tb_switch_resume(struct tb_switch *sw, bool runtime)
{
struct tb_port *port;
int err;
tb_sw_dbg(sw, "resuming switch\n");
/*
* Check for UID of the connected switches except for root
* switch which we assume cannot be removed.
*/
if (tb_route(sw)) {
u64 uid;
/*
* Check first that we can still read the switch config
* space. It may be that there is now another domain
* connected.
*/
err = tb_cfg_get_upstream_port(sw->tb->ctl, tb_route(sw));
if (err < 0) {
tb_sw_info(sw, "switch not present anymore\n");
return err;
}
/* We don't have any way to confirm this was the same device */
if (!sw->uid)
return -ENODEV;
if (tb_switch_is_usb4(sw))
err = usb4_switch_read_uid(sw, &uid);
else
err = tb_drom_read_uid_only(sw, &uid);
if (err) {
tb_sw_warn(sw, "uid read failed\n");
return err;
}
if (sw->uid != uid) {
tb_sw_info(sw,
"changed while suspended (uid %#llx -> %#llx)\n",
sw->uid, uid);
return -ENODEV;
}
}
err = tb_switch_configure(sw);
if (err)
return err;
if (!runtime)
tb_switch_check_wakes(sw);
/* Disable wakes */
tb_switch_set_wake(sw, 0);
err = tb_switch_tmu_init(sw);
if (err)
return err;
/* check for surviving downstream switches */
tb_switch_for_each_port(sw, port) {
if (!tb_port_is_null(port))
continue;
if (!tb_port_resume(port))
continue;
if (tb_wait_for_port(port, true) <= 0) {
tb_port_warn(port,
"lost during suspend, disconnecting\n");
if (tb_port_has_remote(port))
tb_sw_set_unplugged(port->remote->sw);
else if (port->xdomain)
port->xdomain->is_unplugged = true;
} else {
/*
* Always unlock the port so the downstream
* switch/domain is accessible.
*/
if (tb_port_unlock(port))
tb_port_warn(port, "failed to unlock port\n");
if (port->remote &&
tb_switch_resume(port->remote->sw, runtime)) {
tb_port_warn(port,
"lost during suspend, disconnecting\n");
tb_sw_set_unplugged(port->remote->sw);
}
}
}
return 0;
}
/**
* tb_switch_suspend() - Put a switch to sleep
* @sw: Switch to suspend
* @runtime: Is this runtime suspend or system sleep
*
* Suspends router and all its children. Enables wakes according to
* value of @runtime and then sets sleep bit for the router. If @sw is
* host router the domain is ready to go to sleep once this function
* returns.
*/
void tb_switch_suspend(struct tb_switch *sw, bool runtime)
{
unsigned int flags = 0;
struct tb_port *port;
int err;
tb_sw_dbg(sw, "suspending switch\n");
/*
* Actually only needed for Titan Ridge but for simplicity can be
* done for USB4 device too as CLx is re-enabled at resume.
*/
tb_switch_clx_disable(sw);
err = tb_plug_events_active(sw, false);
if (err)
return;
tb_switch_for_each_port(sw, port) {
if (tb_port_has_remote(port))
tb_switch_suspend(port->remote->sw, runtime);
}
if (runtime) {
/* Trigger wake when something is plugged in/out */
flags |= TB_WAKE_ON_CONNECT | TB_WAKE_ON_DISCONNECT;
flags |= TB_WAKE_ON_USB4;
flags |= TB_WAKE_ON_USB3 | TB_WAKE_ON_PCIE | TB_WAKE_ON_DP;
} else if (device_may_wakeup(&sw->dev)) {
flags |= TB_WAKE_ON_USB4 | TB_WAKE_ON_USB3 | TB_WAKE_ON_PCIE;
}
tb_switch_set_wake(sw, flags);
if (tb_switch_is_usb4(sw))
usb4_switch_set_sleep(sw);
else
tb_lc_set_sleep(sw);
}
/**
* tb_switch_query_dp_resource() - Query availability of DP resource
* @sw: Switch whose DP resource is queried
* @in: DP IN port
*
* Queries availability of DP resource for DP tunneling using switch
* specific means. Returns %true if resource is available.
*/
bool tb_switch_query_dp_resource(struct tb_switch *sw, struct tb_port *in)
{
if (tb_switch_is_usb4(sw))
return usb4_switch_query_dp_resource(sw, in);
return tb_lc_dp_sink_query(sw, in);
}
/**
* tb_switch_alloc_dp_resource() - Allocate available DP resource
* @sw: Switch whose DP resource is allocated
* @in: DP IN port
*
* Allocates DP resource for DP tunneling. The resource must be
* available for this to succeed (see tb_switch_query_dp_resource()).
* Returns %0 in success and negative errno otherwise.
*/
int tb_switch_alloc_dp_resource(struct tb_switch *sw, struct tb_port *in)
{
int ret;
if (tb_switch_is_usb4(sw))
ret = usb4_switch_alloc_dp_resource(sw, in);
else
ret = tb_lc_dp_sink_alloc(sw, in);
if (ret)
tb_sw_warn(sw, "failed to allocate DP resource for port %d\n",
in->port);
else
tb_sw_dbg(sw, "allocated DP resource for port %d\n", in->port);
return ret;
}
/**
* tb_switch_dealloc_dp_resource() - De-allocate DP resource
* @sw: Switch whose DP resource is de-allocated
* @in: DP IN port
*
* De-allocates DP resource that was previously allocated for DP
* tunneling.
*/
void tb_switch_dealloc_dp_resource(struct tb_switch *sw, struct tb_port *in)
{
int ret;
if (tb_switch_is_usb4(sw))
ret = usb4_switch_dealloc_dp_resource(sw, in);
else
ret = tb_lc_dp_sink_dealloc(sw, in);
if (ret)
tb_sw_warn(sw, "failed to de-allocate DP resource for port %d\n",
in->port);
else
tb_sw_dbg(sw, "released DP resource for port %d\n", in->port);
}
struct tb_sw_lookup {
struct tb *tb;
u8 link;
u8 depth;
const uuid_t *uuid;
u64 route;
};
static int tb_switch_match(struct device *dev, const void *data)
{
struct tb_switch *sw = tb_to_switch(dev);
const struct tb_sw_lookup *lookup = data;
if (!sw)
return 0;
if (sw->tb != lookup->tb)
return 0;
if (lookup->uuid)
return !memcmp(sw->uuid, lookup->uuid, sizeof(*lookup->uuid));
if (lookup->route) {
return sw->config.route_lo == lower_32_bits(lookup->route) &&
sw->config.route_hi == upper_32_bits(lookup->route);
}
/* Root switch is matched only by depth */
if (!lookup->depth)
return !sw->depth;
return sw->link == lookup->link && sw->depth == lookup->depth;
}
/**
* tb_switch_find_by_link_depth() - Find switch by link and depth
* @tb: Domain the switch belongs
* @link: Link number the switch is connected
* @depth: Depth of the switch in link
*
* Returned switch has reference count increased so the caller needs to
* call tb_switch_put() when done with the switch.
*/
struct tb_switch *tb_switch_find_by_link_depth(struct tb *tb, u8 link, u8 depth)
{
struct tb_sw_lookup lookup;
struct device *dev;
memset(&lookup, 0, sizeof(lookup));
lookup.tb = tb;
lookup.link = link;
lookup.depth = depth;
dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
if (dev)
return tb_to_switch(dev);
return NULL;
}
/**
* tb_switch_find_by_uuid() - Find switch by UUID
* @tb: Domain the switch belongs
* @uuid: UUID to look for
*
* Returned switch has reference count increased so the caller needs to
* call tb_switch_put() when done with the switch.
*/
struct tb_switch *tb_switch_find_by_uuid(struct tb *tb, const uuid_t *uuid)
{
struct tb_sw_lookup lookup;
struct device *dev;
memset(&lookup, 0, sizeof(lookup));
lookup.tb = tb;
lookup.uuid = uuid;
dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
if (dev)
return tb_to_switch(dev);
return NULL;
}
/**
* tb_switch_find_by_route() - Find switch by route string
* @tb: Domain the switch belongs
* @route: Route string to look for
*
* Returned switch has reference count increased so the caller needs to
* call tb_switch_put() when done with the switch.
*/
struct tb_switch *tb_switch_find_by_route(struct tb *tb, u64 route)
{
struct tb_sw_lookup lookup;
struct device *dev;
if (!route)
return tb_switch_get(tb->root_switch);
memset(&lookup, 0, sizeof(lookup));
lookup.tb = tb;
lookup.route = route;
dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
if (dev)
return tb_to_switch(dev);
return NULL;
}
/**
* tb_switch_find_port() - return the first port of @type on @sw or NULL
* @sw: Switch to find the port from
* @type: Port type to look for
*/
struct tb_port *tb_switch_find_port(struct tb_switch *sw,
enum tb_port_type type)
{
struct tb_port *port;
tb_switch_for_each_port(sw, port) {
if (port->config.type == type)
return port;
}
return NULL;
}
/*
* Can be used for read/write a specified PCIe bridge for any Thunderbolt 3
* device. For now used only for Titan Ridge.
*/
static int tb_switch_pcie_bridge_write(struct tb_switch *sw, unsigned int bridge,
unsigned int pcie_offset, u32 value)
{
u32 offset, command, val;
int ret;
if (sw->generation != 3)
return -EOPNOTSUPP;
offset = sw->cap_plug_events + TB_PLUG_EVENTS_PCIE_WR_DATA;
ret = tb_sw_write(sw, &value, TB_CFG_SWITCH, offset, 1);
if (ret)
return ret;
command = pcie_offset & TB_PLUG_EVENTS_PCIE_CMD_DW_OFFSET_MASK;
command |= BIT(bridge + TB_PLUG_EVENTS_PCIE_CMD_BR_SHIFT);
command |= TB_PLUG_EVENTS_PCIE_CMD_RD_WR_MASK;
command |= TB_PLUG_EVENTS_PCIE_CMD_COMMAND_VAL
<< TB_PLUG_EVENTS_PCIE_CMD_COMMAND_SHIFT;
command |= TB_PLUG_EVENTS_PCIE_CMD_REQ_ACK_MASK;
offset = sw->cap_plug_events + TB_PLUG_EVENTS_PCIE_CMD;
ret = tb_sw_write(sw, &command, TB_CFG_SWITCH, offset, 1);
if (ret)
return ret;
ret = tb_switch_wait_for_bit(sw, offset,
TB_PLUG_EVENTS_PCIE_CMD_REQ_ACK_MASK, 0, 100);
if (ret)
return ret;
ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, offset, 1);
if (ret)
return ret;
if (val & TB_PLUG_EVENTS_PCIE_CMD_TIMEOUT_MASK)
return -ETIMEDOUT;
return 0;
}
/**
* tb_switch_pcie_l1_enable() - Enable PCIe link to enter L1 state
* @sw: Router to enable PCIe L1
*
* For Titan Ridge switch to enter CLx state, its PCIe bridges shall enable
* entry to PCIe L1 state. Shall be called after the upstream PCIe tunnel
* was configured. Due to Intel platforms limitation, shall be called only
* for first hop switch.
*/
int tb_switch_pcie_l1_enable(struct tb_switch *sw)
{
struct tb_switch *parent = tb_switch_parent(sw);
int ret;
if (!tb_route(sw))
return 0;
if (!tb_switch_is_titan_ridge(sw))
return 0;
/* Enable PCIe L1 enable only for first hop router (depth = 1) */
if (tb_route(parent))
return 0;
/* Write to downstream PCIe bridge #5 aka Dn4 */
ret = tb_switch_pcie_bridge_write(sw, 5, 0x143, 0x0c7806b1);
if (ret)
return ret;
/* Write to Upstream PCIe bridge #0 aka Up0 */
return tb_switch_pcie_bridge_write(sw, 0, 0x143, 0x0c5806b1);
}
/**
* tb_switch_xhci_connect() - Connect internal xHCI
* @sw: Router whose xHCI to connect
*
* Can be called to any router. For Alpine Ridge and Titan Ridge
* performs special flows that bring the xHCI functional for any device
* connected to the type-C port. Call only after PCIe tunnel has been
* established. The function only does the connect if not done already
* so can be called several times for the same router.
*/
int tb_switch_xhci_connect(struct tb_switch *sw)
{
struct tb_port *port1, *port3;
int ret;
if (sw->generation != 3)
return 0;
port1 = &sw->ports[1];
port3 = &sw->ports[3];
if (tb_switch_is_alpine_ridge(sw)) {
bool usb_port1, usb_port3, xhci_port1, xhci_port3;
usb_port1 = tb_lc_is_usb_plugged(port1);
usb_port3 = tb_lc_is_usb_plugged(port3);
xhci_port1 = tb_lc_is_xhci_connected(port1);
xhci_port3 = tb_lc_is_xhci_connected(port3);
/* Figure out correct USB port to connect */
if (usb_port1 && !xhci_port1) {
ret = tb_lc_xhci_connect(port1);
if (ret)
return ret;
}
if (usb_port3 && !xhci_port3)
return tb_lc_xhci_connect(port3);
} else if (tb_switch_is_titan_ridge(sw)) {
ret = tb_lc_xhci_connect(port1);
if (ret)
return ret;
return tb_lc_xhci_connect(port3);
}
return 0;
}
/**
* tb_switch_xhci_disconnect() - Disconnect internal xHCI
* @sw: Router whose xHCI to disconnect
*
* The opposite of tb_switch_xhci_connect(). Disconnects xHCI on both
* ports.
*/
void tb_switch_xhci_disconnect(struct tb_switch *sw)
{
if (sw->generation == 3) {
struct tb_port *port1 = &sw->ports[1];
struct tb_port *port3 = &sw->ports[3];
tb_lc_xhci_disconnect(port1);
tb_port_dbg(port1, "disconnected xHCI\n");
tb_lc_xhci_disconnect(port3);
tb_port_dbg(port3, "disconnected xHCI\n");
}
}
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