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/* SPDX-License-Identifier: GPL-2.0 */
* Thunderbolt driver - bus logic (NHI independent)
* Copyright (c) 2014 Andreas Noever <>
* Copyright (C) 2018, Intel Corporation
#ifndef TB_H_
#define TB_H_
#include <linux/nvmem-provider.h>
#include <linux/pci.h>
#include <linux/thunderbolt.h>
#include <linux/uuid.h>
#include "tb_regs.h"
#include "ctl.h"
#include "dma_port.h"
* struct tb_switch_nvm - Structure holding switch NVM information
* @major: Major version number of the active NVM portion
* @minor: Minor version number of the active NVM portion
* @id: Identifier used with both NVM portions
* @active: Active portion NVMem device
* @non_active: Non-active portion NVMem device
* @buf: Buffer where the NVM image is stored before it is written to
* the actual NVM flash device
* @buf_data_size: Number of bytes actually consumed by the new NVM
* image
* @authenticating: The switch is authenticating the new NVM
struct tb_switch_nvm {
u8 major;
u8 minor;
int id;
struct nvmem_device *active;
struct nvmem_device *non_active;
void *buf;
size_t buf_data_size;
bool authenticating;
* struct tb_switch - a thunderbolt switch
* @dev: Device for the switch
* @config: Switch configuration
* @ports: Ports in this switch
* @dma_port: If the switch has port supporting DMA configuration based
* mailbox this will hold the pointer to that (%NULL
* otherwise). If set it also means the switch has
* upgradeable NVM.
* @tb: Pointer to the domain the switch belongs to
* @uid: Unique ID of the switch
* @uuid: UUID of the switch (or %NULL if not supported)
* @vendor: Vendor ID of the switch
* @device: Device ID of the switch
* @vendor_name: Name of the vendor (or %NULL if not known)
* @device_name: Name of the device (or %NULL if not known)
* @generation: Switch Thunderbolt generation
* @cap_plug_events: Offset to the plug events capability (%0 if not found)
* @cap_lc: Offset to the link controller capability (%0 if not found)
* @is_unplugged: The switch is going away
* @drom: DROM of the switch (%NULL if not found)
* @nvm: Pointer to the NVM if the switch has one (%NULL otherwise)
* @no_nvm_upgrade: Prevent NVM upgrade of this switch
* @safe_mode: The switch is in safe-mode
* @boot: Whether the switch was already authorized on boot or not
* @rpm: The switch supports runtime PM
* @authorized: Whether the switch is authorized by user or policy
* @security_level: Switch supported security level
* @key: Contains the key used to challenge the device or %NULL if not
* supported. Size of the key is %TB_SWITCH_KEY_SIZE.
* @connection_id: Connection ID used with ICM messaging
* @connection_key: Connection key used with ICM messaging
* @link: Root switch link this switch is connected (ICM only)
* @depth: Depth in the chain this switch is connected (ICM only)
* @rpm_complete: Completion used to wait for runtime resume to
* complete (ICM only)
* When the switch is being added or removed to the domain (other
* switches) you need to have domain lock held.
struct tb_switch {
struct device dev;
struct tb_regs_switch_header config;
struct tb_port *ports;
struct tb_dma_port *dma_port;
struct tb *tb;
u64 uid;
uuid_t *uuid;
u16 vendor;
u16 device;
const char *vendor_name;
const char *device_name;
unsigned int generation;
int cap_plug_events;
int cap_lc;
bool is_unplugged;
u8 *drom;
struct tb_switch_nvm *nvm;
bool no_nvm_upgrade;
bool safe_mode;
bool boot;
bool rpm;
unsigned int authorized;
enum tb_security_level security_level;
u8 *key;
u8 connection_id;
u8 connection_key;
u8 link;
u8 depth;
struct completion rpm_complete;
* struct tb_port - a thunderbolt port, part of a tb_switch
* @config: Cached port configuration read from registers
* @sw: Switch the port belongs to
* @remote: Remote port (%NULL if not connected)
* @xdomain: Remote host (%NULL if not connected)
* @cap_phy: Offset, zero if not found
* @cap_adap: Offset of the adapter specific capability (%0 if not present)
* @port: Port number on switch
* @disabled: Disabled by eeprom
* @dual_link_port: If the switch is connected using two ports, points
* to the other port.
* @link_nr: Is this primary or secondary port on the dual_link.
* @in_hopids: Currently allocated input HopIDs
* @out_hopids: Currently allocated output HopIDs
struct tb_port {
struct tb_regs_port_header config;
struct tb_switch *sw;
struct tb_port *remote;
struct tb_xdomain *xdomain;
int cap_phy;
int cap_adap;
u8 port;
bool disabled;
struct tb_port *dual_link_port;
u8 link_nr:1;
struct ida in_hopids;
struct ida out_hopids;
* struct tb_path_hop - routing information for a tb_path
* @in_port: Ingress port of a switch
* @out_port: Egress port of a switch where the packet is routed out
* (must be on the same switch than @in_port)
* @in_hop_index: HopID where the path configuration entry is placed in
* the path config space of @in_port.
* @in_counter_index: Used counter index (not used in the driver
* currently, %-1 to disable)
* @next_hop_index: HopID of the packet when it is routed out from @out_port
* @initial_credits: Number of initial flow control credits allocated for
* the path
* Hop configuration is always done on the IN port of a switch.
* in_port and out_port have to be on the same switch. Packets arriving on
* in_port with "hop" = in_hop_index will get routed to through out_port. The
* next hop to take (on out_port->remote) is determined by
* next_hop_index. When routing packet to another switch (out->remote is
* set) the @next_hop_index must match the @in_hop_index of that next
* hop to make routing possible.
* in_counter_index is the index of a counter (in TB_CFG_COUNTERS) on the in
* port.
struct tb_path_hop {
struct tb_port *in_port;
struct tb_port *out_port;
int in_hop_index;
int in_counter_index;
int next_hop_index;
unsigned int initial_credits;
* enum tb_path_port - path options mask
* @TB_PATH_NONE: Do not activate on any hop on path
* @TB_PATH_SOURCE: Activate on the first hop (out of src)
* @TB_PATH_INTERNAL: Activate on the intermediate hops (not the first/last)
* @TB_PATH_DESTINATION: Activate on the last hop (into dst)
* @TB_PATH_ALL: Activate on all hops on the path
enum tb_path_port {
* struct tb_path - a unidirectional path between two ports
* @tb: Pointer to the domain structure
* @name: Name of the path (used for debugging)
* @nfc_credits: Number of non flow controlled credits allocated for the path
* @ingress_shared_buffer: Shared buffering used for ingress ports on the path
* @egress_shared_buffer: Shared buffering used for egress ports on the path
* @ingress_fc_enable: Flow control for ingress ports on the path
* @egress_fc_enable: Flow control for egress ports on the path
* @priority: Priority group if the path
* @weight: Weight of the path inside the priority group
* @drop_packages: Drop packages from queue tail or head
* @activated: Is the path active
* @clear_fc: Clear all flow control from the path config space entries
* when deactivating this path
* @hops: Path hops
* @path_length: How many hops the path uses
* A path consists of a number of hops (see &struct tb_path_hop). To
* establish a PCIe tunnel two paths have to be created between the two
* PCIe ports.
struct tb_path {
struct tb *tb;
const char *name;
int nfc_credits;
enum tb_path_port ingress_shared_buffer;
enum tb_path_port egress_shared_buffer;
enum tb_path_port ingress_fc_enable;
enum tb_path_port egress_fc_enable;
unsigned int priority:3;
int weight:4;
bool drop_packages;
bool activated;
bool clear_fc;
struct tb_path_hop *hops;
int path_length;
/* HopIDs 0-7 are reserved by the Thunderbolt protocol */
#define TB_PATH_MAX_HOPS 7
* struct tb_cm_ops - Connection manager specific operations vector
* @driver_ready: Called right after control channel is started. Used by
* ICM to send driver ready message to the firmware.
* @start: Starts the domain
* @stop: Stops the domain
* @suspend_noirq: Connection manager specific suspend_noirq
* @resume_noirq: Connection manager specific resume_noirq
* @suspend: Connection manager specific suspend
* @complete: Connection manager specific complete
* @runtime_suspend: Connection manager specific runtime_suspend
* @runtime_resume: Connection manager specific runtime_resume
* @runtime_suspend_switch: Runtime suspend a switch
* @runtime_resume_switch: Runtime resume a switch
* @handle_event: Handle thunderbolt event
* @get_boot_acl: Get boot ACL list
* @set_boot_acl: Set boot ACL list
* @approve_switch: Approve switch
* @add_switch_key: Add key to switch
* @challenge_switch_key: Challenge switch using key
* @disconnect_pcie_paths: Disconnects PCIe paths before NVM update
* @approve_xdomain_paths: Approve (establish) XDomain DMA paths
* @disconnect_xdomain_paths: Disconnect XDomain DMA paths
struct tb_cm_ops {
int (*driver_ready)(struct tb *tb);
int (*start)(struct tb *tb);
void (*stop)(struct tb *tb);
int (*suspend_noirq)(struct tb *tb);
int (*resume_noirq)(struct tb *tb);
int (*suspend)(struct tb *tb);
void (*complete)(struct tb *tb);
int (*runtime_suspend)(struct tb *tb);
int (*runtime_resume)(struct tb *tb);
int (*runtime_suspend_switch)(struct tb_switch *sw);
int (*runtime_resume_switch)(struct tb_switch *sw);
void (*handle_event)(struct tb *tb, enum tb_cfg_pkg_type,
const void *buf, size_t size);
int (*get_boot_acl)(struct tb *tb, uuid_t *uuids, size_t nuuids);
int (*set_boot_acl)(struct tb *tb, const uuid_t *uuids, size_t nuuids);
int (*approve_switch)(struct tb *tb, struct tb_switch *sw);
int (*add_switch_key)(struct tb *tb, struct tb_switch *sw);
int (*challenge_switch_key)(struct tb *tb, struct tb_switch *sw,
const u8 *challenge, u8 *response);
int (*disconnect_pcie_paths)(struct tb *tb);
int (*approve_xdomain_paths)(struct tb *tb, struct tb_xdomain *xd);
int (*disconnect_xdomain_paths)(struct tb *tb, struct tb_xdomain *xd);
static inline void *tb_priv(struct tb *tb)
return (void *)tb->privdata;
#define TB_AUTOSUSPEND_DELAY 15000 /* ms */
/* helper functions & macros */
* tb_upstream_port() - return the upstream port of a switch
* Every switch has an upstream port (for the root switch it is the NHI).
* During switch alloc/init tb_upstream_port()->remote may be NULL, even for
* non root switches (on the NHI port remote is always NULL).
* Return: Returns the upstream port of the switch.
static inline struct tb_port *tb_upstream_port(struct tb_switch *sw)
return &sw->ports[sw->config.upstream_port_number];
* tb_is_upstream_port() - Is the port upstream facing
* @port: Port to check
* Returns true if @port is upstream facing port. In case of dual link
* ports both return true.
static inline bool tb_is_upstream_port(const struct tb_port *port)
const struct tb_port *upstream_port = tb_upstream_port(port->sw);
return port == upstream_port || port->dual_link_port == upstream_port;
static inline u64 tb_route(const struct tb_switch *sw)
return ((u64) sw->config.route_hi) << 32 | sw->config.route_lo;
static inline struct tb_port *tb_port_at(u64 route, struct tb_switch *sw)
u8 port;
port = route >> (sw->config.depth * 8);
if (WARN_ON(port > sw->config.max_port_number))
return NULL;
return &sw->ports[port];
* tb_port_has_remote() - Does the port have switch connected downstream
* @port: Port to check
* Returns true only when the port is primary port and has remote set.
static inline bool tb_port_has_remote(const struct tb_port *port)
if (tb_is_upstream_port(port))
return false;
if (!port->remote)
return false;
if (port->dual_link_port && port->link_nr)
return false;
return true;
static inline bool tb_port_is_null(const struct tb_port *port)
return port && port->port && port->config.type == TB_TYPE_PORT;
static inline bool tb_port_is_pcie_down(const struct tb_port *port)
return port && port->config.type == TB_TYPE_PCIE_DOWN;
static inline bool tb_port_is_pcie_up(const struct tb_port *port)
return port && port->config.type == TB_TYPE_PCIE_UP;
static inline bool tb_port_is_dpin(const struct tb_port *port)
return port && port->config.type == TB_TYPE_DP_HDMI_IN;
static inline bool tb_port_is_dpout(const struct tb_port *port)
return port && port->config.type == TB_TYPE_DP_HDMI_OUT;
static inline int tb_sw_read(struct tb_switch *sw, void *buffer,
enum tb_cfg_space space, u32 offset, u32 length)
if (sw->is_unplugged)
return -ENODEV;
return tb_cfg_read(sw->tb->ctl,
static inline int tb_sw_write(struct tb_switch *sw, void *buffer,
enum tb_cfg_space space, u32 offset, u32 length)
if (sw->is_unplugged)
return -ENODEV;
return tb_cfg_write(sw->tb->ctl,
static inline int tb_port_read(struct tb_port *port, void *buffer,
enum tb_cfg_space space, u32 offset, u32 length)
if (port->sw->is_unplugged)
return -ENODEV;
return tb_cfg_read(port->sw->tb->ctl,
static inline int tb_port_write(struct tb_port *port, const void *buffer,
enum tb_cfg_space space, u32 offset, u32 length)
if (port->sw->is_unplugged)
return -ENODEV;
return tb_cfg_write(port->sw->tb->ctl,
#define tb_err(tb, fmt, arg...) dev_err(&(tb)->nhi->pdev->dev, fmt, ## arg)
#define tb_WARN(tb, fmt, arg...) dev_WARN(&(tb)->nhi->pdev->dev, fmt, ## arg)
#define tb_warn(tb, fmt, arg...) dev_warn(&(tb)->nhi->pdev->dev, fmt, ## arg)
#define tb_info(tb, fmt, arg...) dev_info(&(tb)->nhi->pdev->dev, fmt, ## arg)
#define tb_dbg(tb, fmt, arg...) dev_dbg(&(tb)->nhi->pdev->dev, fmt, ## arg)
#define __TB_SW_PRINT(level, sw, fmt, arg...) \
do { \
const struct tb_switch *__sw = (sw); \
level(__sw->tb, "%llx: " fmt, \
tb_route(__sw), ## arg); \
} while (0)
#define tb_sw_WARN(sw, fmt, arg...) __TB_SW_PRINT(tb_WARN, sw, fmt, ##arg)
#define tb_sw_warn(sw, fmt, arg...) __TB_SW_PRINT(tb_warn, sw, fmt, ##arg)
#define tb_sw_info(sw, fmt, arg...) __TB_SW_PRINT(tb_info, sw, fmt, ##arg)
#define tb_sw_dbg(sw, fmt, arg...) __TB_SW_PRINT(tb_dbg, sw, fmt, ##arg)
#define __TB_PORT_PRINT(level, _port, fmt, arg...) \
do { \
const struct tb_port *__port = (_port); \
level(__port->sw->tb, "%llx:%x: " fmt, \
tb_route(__port->sw), __port->port, ## arg); \
} while (0)
#define tb_port_WARN(port, fmt, arg...) \
__TB_PORT_PRINT(tb_WARN, port, fmt, ##arg)
#define tb_port_warn(port, fmt, arg...) \
__TB_PORT_PRINT(tb_warn, port, fmt, ##arg)
#define tb_port_info(port, fmt, arg...) \
__TB_PORT_PRINT(tb_info, port, fmt, ##arg)
#define tb_port_dbg(port, fmt, arg...) \
__TB_PORT_PRINT(tb_dbg, port, fmt, ##arg)
struct tb *icm_probe(struct tb_nhi *nhi);
struct tb *tb_probe(struct tb_nhi *nhi);
extern struct device_type tb_domain_type;
extern struct device_type tb_switch_type;
int tb_domain_init(void);
void tb_domain_exit(void);
void tb_switch_exit(void);
int tb_xdomain_init(void);
void tb_xdomain_exit(void);
struct tb *tb_domain_alloc(struct tb_nhi *nhi, size_t privsize);
int tb_domain_add(struct tb *tb);
void tb_domain_remove(struct tb *tb);
int tb_domain_suspend_noirq(struct tb *tb);
int tb_domain_resume_noirq(struct tb *tb);
int tb_domain_suspend(struct tb *tb);
void tb_domain_complete(struct tb *tb);
int tb_domain_runtime_suspend(struct tb *tb);
int tb_domain_runtime_resume(struct tb *tb);
int tb_domain_approve_switch(struct tb *tb, struct tb_switch *sw);
int tb_domain_approve_switch_key(struct tb *tb, struct tb_switch *sw);
int tb_domain_challenge_switch_key(struct tb *tb, struct tb_switch *sw);
int tb_domain_disconnect_pcie_paths(struct tb *tb);
int tb_domain_approve_xdomain_paths(struct tb *tb, struct tb_xdomain *xd);
int tb_domain_disconnect_xdomain_paths(struct tb *tb, struct tb_xdomain *xd);
int tb_domain_disconnect_all_paths(struct tb *tb);
static inline struct tb *tb_domain_get(struct tb *tb)
if (tb)
return tb;
static inline void tb_domain_put(struct tb *tb)
struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent,
u64 route);
struct tb_switch *tb_switch_alloc_safe_mode(struct tb *tb,
struct device *parent, u64 route);
int tb_switch_configure(struct tb_switch *sw);
int tb_switch_add(struct tb_switch *sw);
void tb_switch_remove(struct tb_switch *sw);
void tb_switch_suspend(struct tb_switch *sw);
int tb_switch_resume(struct tb_switch *sw);
int tb_switch_reset(struct tb *tb, u64 route);
void tb_sw_set_unplugged(struct tb_switch *sw);
struct tb_switch *tb_switch_find_by_link_depth(struct tb *tb, u8 link,
u8 depth);
struct tb_switch *tb_switch_find_by_uuid(struct tb *tb, const uuid_t *uuid);
struct tb_switch *tb_switch_find_by_route(struct tb *tb, u64 route);
static inline struct tb_switch *tb_switch_get(struct tb_switch *sw)
if (sw)
return sw;
static inline void tb_switch_put(struct tb_switch *sw)
static inline bool tb_is_switch(const struct device *dev)
return dev->type == &tb_switch_type;
static inline struct tb_switch *tb_to_switch(struct device *dev)
if (tb_is_switch(dev))
return container_of(dev, struct tb_switch, dev);
return NULL;
static inline struct tb_switch *tb_switch_parent(struct tb_switch *sw)
return tb_to_switch(sw->dev.parent);
static inline bool tb_switch_is_lr(const struct tb_switch *sw)
return sw->config.device_id == PCI_DEVICE_ID_INTEL_LIGHT_RIDGE;
static inline bool tb_switch_is_er(const struct tb_switch *sw)
return sw->config.device_id == PCI_DEVICE_ID_INTEL_EAGLE_RIDGE;
static inline bool tb_switch_is_cr(const struct tb_switch *sw)
switch (sw->config.device_id) {
return true;
return false;
static inline bool tb_switch_is_fr(const struct tb_switch *sw)
switch (sw->config.device_id) {
return true;
return false;
int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged);
int tb_port_add_nfc_credits(struct tb_port *port, int credits);
int tb_port_set_initial_credits(struct tb_port *port, u32 credits);
int tb_port_clear_counter(struct tb_port *port, int counter);
int tb_port_alloc_in_hopid(struct tb_port *port, int hopid, int max_hopid);
void tb_port_release_in_hopid(struct tb_port *port, int hopid);
int tb_port_alloc_out_hopid(struct tb_port *port, int hopid, int max_hopid);
void tb_port_release_out_hopid(struct tb_port *port, int hopid);
struct tb_port *tb_next_port_on_path(struct tb_port *start, struct tb_port *end,
struct tb_port *prev);
int tb_switch_find_vse_cap(struct tb_switch *sw, enum tb_switch_vse_cap vsec);
int tb_port_find_cap(struct tb_port *port, enum tb_port_cap cap);
bool tb_port_is_enabled(struct tb_port *port);
bool tb_pci_port_is_enabled(struct tb_port *port);
int tb_pci_port_enable(struct tb_port *port, bool enable);
int tb_dp_port_hpd_is_active(struct tb_port *port);
int tb_dp_port_hpd_clear(struct tb_port *port);
int tb_dp_port_set_hops(struct tb_port *port, unsigned int video,
unsigned int aux_tx, unsigned int aux_rx);
bool tb_dp_port_is_enabled(struct tb_port *port);
int tb_dp_port_enable(struct tb_port *port, bool enable);
struct tb_path *tb_path_discover(struct tb_port *src, int src_hopid,
struct tb_port *dst, int dst_hopid,
struct tb_port **last, const char *name);
struct tb_path *tb_path_alloc(struct tb *tb, struct tb_port *src, int src_hopid,
struct tb_port *dst, int dst_hopid, int link_nr,
const char *name);
void tb_path_free(struct tb_path *path);
int tb_path_activate(struct tb_path *path);
void tb_path_deactivate(struct tb_path *path);
bool tb_path_is_invalid(struct tb_path *path);
int tb_drom_read(struct tb_switch *sw);
int tb_drom_read_uid_only(struct tb_switch *sw, u64 *uid);
int tb_lc_read_uuid(struct tb_switch *sw, u32 *uuid);
int tb_lc_configure_link(struct tb_switch *sw);
void tb_lc_unconfigure_link(struct tb_switch *sw);
int tb_lc_set_sleep(struct tb_switch *sw);
static inline int tb_route_length(u64 route)
return (fls64(route) + TB_ROUTE_SHIFT - 1) / TB_ROUTE_SHIFT;
* tb_downstream_route() - get route to downstream switch
* Port must not be the upstream port (otherwise a loop is created).
* Return: Returns a route to the switch behind @port.
static inline u64 tb_downstream_route(struct tb_port *port)
return tb_route(port->sw)
| ((u64) port->port << (port->sw->config.depth * 8));
bool tb_xdomain_handle_request(struct tb *tb, enum tb_cfg_pkg_type type,
const void *buf, size_t size);
struct tb_xdomain *tb_xdomain_alloc(struct tb *tb, struct device *parent,
u64 route, const uuid_t *local_uuid,
const uuid_t *remote_uuid);
void tb_xdomain_add(struct tb_xdomain *xd);
void tb_xdomain_remove(struct tb_xdomain *xd);
struct tb_xdomain *tb_xdomain_find_by_link_depth(struct tb *tb, u8 link,
u8 depth);