root/drivers/thunderbolt/tb.h

INCLUDED FROM

DEFINITIONS

1. tb_priv
2. tb_upstream_port
3. tb_is_upstream_port
4. tb_route
5. tb_port_at
6. tb_port_has_remote
7. tb_port_is_null
8. tb_port_is_pcie_down
9. tb_port_is_pcie_up
10. tb_port_is_dpin
11. tb_port_is_dpout
12. tb_sw_read
13. tb_sw_write
14. tb_port_read
15. tb_port_write
16. tb_domain_get
17. tb_domain_put
18. tb_switch_get
19. tb_switch_put
20. tb_is_switch
21. tb_to_switch
22. tb_switch_parent
23. tb_switch_is_lr
24. tb_switch_is_er
25. tb_switch_is_cr
26. tb_switch_is_fr
27. tb_route_length
28. tb_downstream_route

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Thunderbolt driver - bus logic (NHI independent)
   4  *
   5  * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
   6  * Copyright (C) 2018, Intel Corporation
   7  */
   8 
   9 #ifndef TB_H_
  10 #define TB_H_
  11 
  12 #include <linux/nvmem-provider.h>
  13 #include <linux/pci.h>
  14 #include <linux/thunderbolt.h>
  15 #include <linux/uuid.h>
  16 
  17 #include "tb_regs.h"
  18 #include "ctl.h"
  19 #include "dma_port.h"
  20 
  21 /**
  22  * struct tb_switch_nvm - Structure holding switch NVM information
  23  * @major: Major version number of the active NVM portion
  24  * @minor: Minor version number of the active NVM portion
  25  * @id: Identifier used with both NVM portions
  26  * @active: Active portion NVMem device
  27  * @non_active: Non-active portion NVMem device
  28  * @buf: Buffer where the NVM image is stored before it is written to
  29  *       the actual NVM flash device
  30  * @buf_data_size: Number of bytes actually consumed by the new NVM
  31  *                 image
  32  * @authenticating: The switch is authenticating the new NVM
  33  */
  34 struct tb_switch_nvm {
  35         u8 major;
  36         u8 minor;
  37         int id;
  38         struct nvmem_device *active;
  39         struct nvmem_device *non_active;
  40         void *buf;
  41         size_t buf_data_size;
  42         bool authenticating;
  43 };
  44 
  45 #define TB_SWITCH_KEY_SIZE              32
  46 #define TB_SWITCH_MAX_DEPTH             6
  47 
  48 /**
  49  * struct tb_switch - a thunderbolt switch
  50  * @dev: Device for the switch
  51  * @config: Switch configuration
  52  * @ports: Ports in this switch
  53  * @dma_port: If the switch has port supporting DMA configuration based
  54  *            mailbox this will hold the pointer to that (%NULL
  55  *            otherwise). If set it also means the switch has
  56  *            upgradeable NVM.
  57  * @tb: Pointer to the domain the switch belongs to
  58  * @uid: Unique ID of the switch
  59  * @uuid: UUID of the switch (or %NULL if not supported)
  60  * @vendor: Vendor ID of the switch
  61  * @device: Device ID of the switch
  62  * @vendor_name: Name of the vendor (or %NULL if not known)
  63  * @device_name: Name of the device (or %NULL if not known)
  64  * @generation: Switch Thunderbolt generation
  65  * @cap_plug_events: Offset to the plug events capability (%0 if not found)
  66  * @cap_lc: Offset to the link controller capability (%0 if not found)
  67  * @is_unplugged: The switch is going away
  68  * @drom: DROM of the switch (%NULL if not found)
  69  * @nvm: Pointer to the NVM if the switch has one (%NULL otherwise)
  70  * @no_nvm_upgrade: Prevent NVM upgrade of this switch
  71  * @safe_mode: The switch is in safe-mode
  72  * @boot: Whether the switch was already authorized on boot or not
  73  * @rpm: The switch supports runtime PM
  74  * @authorized: Whether the switch is authorized by user or policy
  75  * @security_level: Switch supported security level
  76  * @key: Contains the key used to challenge the device or %NULL if not
  77  *       supported. Size of the key is %TB_SWITCH_KEY_SIZE.
  78  * @connection_id: Connection ID used with ICM messaging
  79  * @connection_key: Connection key used with ICM messaging
  80  * @link: Root switch link this switch is connected (ICM only)
  81  * @depth: Depth in the chain this switch is connected (ICM only)
  82  * @rpm_complete: Completion used to wait for runtime resume to
  83  *                complete (ICM only)
  84  *
  85  * When the switch is being added or removed to the domain (other
  86  * switches) you need to have domain lock held.
  87  */
  88 struct tb_switch {
  89         struct device dev;
  90         struct tb_regs_switch_header config;
  91         struct tb_port *ports;
  92         struct tb_dma_port *dma_port;
  93         struct tb *tb;
  94         u64 uid;
  95         uuid_t *uuid;
  96         u16 vendor;
  97         u16 device;
  98         const char *vendor_name;
  99         const char *device_name;
 100         unsigned int generation;
 101         int cap_plug_events;
 102         int cap_lc;
 103         bool is_unplugged;
 104         u8 *drom;
 105         struct tb_switch_nvm *nvm;
 106         bool no_nvm_upgrade;
 107         bool safe_mode;
 108         bool boot;
 109         bool rpm;
 110         unsigned int authorized;
 111         enum tb_security_level security_level;
 112         u8 *key;
 113         u8 connection_id;
 114         u8 connection_key;
 115         u8 link;
 116         u8 depth;
 117         struct completion rpm_complete;
 118 };
 119 
 120 /**
 121  * struct tb_port - a thunderbolt port, part of a tb_switch
 122  * @config: Cached port configuration read from registers
 123  * @sw: Switch the port belongs to
 124  * @remote: Remote port (%NULL if not connected)
 125  * @xdomain: Remote host (%NULL if not connected)
 126  * @cap_phy: Offset, zero if not found
 127  * @cap_adap: Offset of the adapter specific capability (%0 if not present)
 128  * @port: Port number on switch
 129  * @disabled: Disabled by eeprom
 130  * @dual_link_port: If the switch is connected using two ports, points
 131  *                  to the other port.
 132  * @link_nr: Is this primary or secondary port on the dual_link.
 133  * @in_hopids: Currently allocated input HopIDs
 134  * @out_hopids: Currently allocated output HopIDs
 135  */
 136 struct tb_port {
 137         struct tb_regs_port_header config;
 138         struct tb_switch *sw;
 139         struct tb_port *remote;
 140         struct tb_xdomain *xdomain;
 141         int cap_phy;
 142         int cap_adap;
 143         u8 port;
 144         bool disabled;
 145         struct tb_port *dual_link_port;
 146         u8 link_nr:1;
 147         struct ida in_hopids;
 148         struct ida out_hopids;
 149 };
 150 
 151 /**
 152  * struct tb_path_hop - routing information for a tb_path
 153  * @in_port: Ingress port of a switch
 154  * @out_port: Egress port of a switch where the packet is routed out
 155  *            (must be on the same switch than @in_port)
 156  * @in_hop_index: HopID where the path configuration entry is placed in
 157  *                the path config space of @in_port.
 158  * @in_counter_index: Used counter index (not used in the driver
 159  *                    currently, %-1 to disable)
 160  * @next_hop_index: HopID of the packet when it is routed out from @out_port
 161  * @initial_credits: Number of initial flow control credits allocated for
 162  *                   the path
 163  *
 164  * Hop configuration is always done on the IN port of a switch.
 165  * in_port and out_port have to be on the same switch. Packets arriving on
 166  * in_port with "hop" = in_hop_index will get routed to through out_port. The
 167  * next hop to take (on out_port->remote) is determined by
 168  * next_hop_index. When routing packet to another switch (out->remote is
 169  * set) the @next_hop_index must match the @in_hop_index of that next
 170  * hop to make routing possible.
 171  *
 172  * in_counter_index is the index of a counter (in TB_CFG_COUNTERS) on the in
 173  * port.
 174  */
 175 struct tb_path_hop {
 176         struct tb_port *in_port;
 177         struct tb_port *out_port;
 178         int in_hop_index;
 179         int in_counter_index;
 180         int next_hop_index;
 181         unsigned int initial_credits;
 182 };
 183 
 184 /**
 185  * enum tb_path_port - path options mask
 186  * @TB_PATH_NONE: Do not activate on any hop on path
 187  * @TB_PATH_SOURCE: Activate on the first hop (out of src)
 188  * @TB_PATH_INTERNAL: Activate on the intermediate hops (not the first/last)
 189  * @TB_PATH_DESTINATION: Activate on the last hop (into dst)
 190  * @TB_PATH_ALL: Activate on all hops on the path
 191  */
 192 enum tb_path_port {
 193         TB_PATH_NONE = 0,
 194         TB_PATH_SOURCE = 1,
 195         TB_PATH_INTERNAL = 2,
 196         TB_PATH_DESTINATION = 4,
 197         TB_PATH_ALL = 7,
 198 };
 199 
 200 /**
 201  * struct tb_path - a unidirectional path between two ports
 202  * @tb: Pointer to the domain structure
 203  * @name: Name of the path (used for debugging)
 204  * @nfc_credits: Number of non flow controlled credits allocated for the path
 205  * @ingress_shared_buffer: Shared buffering used for ingress ports on the path
 206  * @egress_shared_buffer: Shared buffering used for egress ports on the path
 207  * @ingress_fc_enable: Flow control for ingress ports on the path
 208  * @egress_fc_enable: Flow control for egress ports on the path
 209  * @priority: Priority group if the path
 210  * @weight: Weight of the path inside the priority group
 211  * @drop_packages: Drop packages from queue tail or head
 212  * @activated: Is the path active
 213  * @clear_fc: Clear all flow control from the path config space entries
 214  *            when deactivating this path
 215  * @hops: Path hops
 216  * @path_length: How many hops the path uses
 217  *
 218  * A path consists of a number of hops (see &struct tb_path_hop). To
 219  * establish a PCIe tunnel two paths have to be created between the two
 220  * PCIe ports.
 221  */
 222 struct tb_path {
 223         struct tb *tb;
 224         const char *name;
 225         int nfc_credits;
 226         enum tb_path_port ingress_shared_buffer;
 227         enum tb_path_port egress_shared_buffer;
 228         enum tb_path_port ingress_fc_enable;
 229         enum tb_path_port egress_fc_enable;
 230 
 231         unsigned int priority:3;
 232         int weight:4;
 233         bool drop_packages;
 234         bool activated;
 235         bool clear_fc;
 236         struct tb_path_hop *hops;
 237         int path_length;
 238 };
 239 
 240 /* HopIDs 0-7 are reserved by the Thunderbolt protocol */
 241 #define TB_PATH_MIN_HOPID       8
 242 #define TB_PATH_MAX_HOPS        7
 243 
 244 /**
 245  * struct tb_cm_ops - Connection manager specific operations vector
 246  * @driver_ready: Called right after control channel is started. Used by
 247  *                ICM to send driver ready message to the firmware.
 248  * @start: Starts the domain
 249  * @stop: Stops the domain
 250  * @suspend_noirq: Connection manager specific suspend_noirq
 251  * @resume_noirq: Connection manager specific resume_noirq
 252  * @suspend: Connection manager specific suspend
 253  * @complete: Connection manager specific complete
 254  * @runtime_suspend: Connection manager specific runtime_suspend
 255  * @runtime_resume: Connection manager specific runtime_resume
 256  * @runtime_suspend_switch: Runtime suspend a switch
 257  * @runtime_resume_switch: Runtime resume a switch
 258  * @handle_event: Handle thunderbolt event
 259  * @get_boot_acl: Get boot ACL list
 260  * @set_boot_acl: Set boot ACL list
 261  * @approve_switch: Approve switch
 262  * @add_switch_key: Add key to switch
 263  * @challenge_switch_key: Challenge switch using key
 264  * @disconnect_pcie_paths: Disconnects PCIe paths before NVM update
 265  * @approve_xdomain_paths: Approve (establish) XDomain DMA paths
 266  * @disconnect_xdomain_paths: Disconnect XDomain DMA paths
 267  */
 268 struct tb_cm_ops {
 269         int (*driver_ready)(struct tb *tb);
 270         int (*start)(struct tb *tb);
 271         void (*stop)(struct tb *tb);
 272         int (*suspend_noirq)(struct tb *tb);
 273         int (*resume_noirq)(struct tb *tb);
 274         int (*suspend)(struct tb *tb);
 275         void (*complete)(struct tb *tb);
 276         int (*runtime_suspend)(struct tb *tb);
 277         int (*runtime_resume)(struct tb *tb);
 278         int (*runtime_suspend_switch)(struct tb_switch *sw);
 279         int (*runtime_resume_switch)(struct tb_switch *sw);
 280         void (*handle_event)(struct tb *tb, enum tb_cfg_pkg_type,
 281                              const void *buf, size_t size);
 282         int (*get_boot_acl)(struct tb *tb, uuid_t *uuids, size_t nuuids);
 283         int (*set_boot_acl)(struct tb *tb, const uuid_t *uuids, size_t nuuids);
 284         int (*approve_switch)(struct tb *tb, struct tb_switch *sw);
 285         int (*add_switch_key)(struct tb *tb, struct tb_switch *sw);
 286         int (*challenge_switch_key)(struct tb *tb, struct tb_switch *sw,
 287                                     const u8 *challenge, u8 *response);
 288         int (*disconnect_pcie_paths)(struct tb *tb);
 289         int (*approve_xdomain_paths)(struct tb *tb, struct tb_xdomain *xd);
 290         int (*disconnect_xdomain_paths)(struct tb *tb, struct tb_xdomain *xd);
 291 };
 292 
 293 static inline void *tb_priv(struct tb *tb)
 294 {
 295         return (void *)tb->privdata;
 296 }
 297 
 298 #define TB_AUTOSUSPEND_DELAY            15000 /* ms */
 299 
 300 /* helper functions & macros */
 301 
 302 /**
 303  * tb_upstream_port() - return the upstream port of a switch
 304  *
 305  * Every switch has an upstream port (for the root switch it is the NHI).
 306  *
 307  * During switch alloc/init tb_upstream_port()->remote may be NULL, even for
 308  * non root switches (on the NHI port remote is always NULL).
 309  *
 310  * Return: Returns the upstream port of the switch.
 311  */
 312 static inline struct tb_port *tb_upstream_port(struct tb_switch *sw)
 313 {
 314         return &sw->ports[sw->config.upstream_port_number];
 315 }
 316 
 317 /**
 318  * tb_is_upstream_port() - Is the port upstream facing
 319  * @port: Port to check
 320  *
 321  * Returns true if @port is upstream facing port. In case of dual link
 322  * ports both return true.
 323  */
 324 static inline bool tb_is_upstream_port(const struct tb_port *port)
 325 {
 326         const struct tb_port *upstream_port = tb_upstream_port(port->sw);
 327         return port == upstream_port || port->dual_link_port == upstream_port;
 328 }
 329 
 330 static inline u64 tb_route(const struct tb_switch *sw)
 331 {
 332         return ((u64) sw->config.route_hi) << 32 | sw->config.route_lo;
 333 }
 334 
 335 static inline struct tb_port *tb_port_at(u64 route, struct tb_switch *sw)
 336 {
 337         u8 port;
 338 
 339         port = route >> (sw->config.depth * 8);
 340         if (WARN_ON(port > sw->config.max_port_number))
 341                 return NULL;
 342         return &sw->ports[port];
 343 }
 344 
 345 /**
 346  * tb_port_has_remote() - Does the port have switch connected downstream
 347  * @port: Port to check
 348  *
 349  * Returns true only when the port is primary port and has remote set.
 350  */
 351 static inline bool tb_port_has_remote(const struct tb_port *port)
 352 {
 353         if (tb_is_upstream_port(port))
 354                 return false;
 355         if (!port->remote)
 356                 return false;
 357         if (port->dual_link_port && port->link_nr)
 358                 return false;
 359 
 360         return true;
 361 }
 362 
 363 static inline bool tb_port_is_null(const struct tb_port *port)
 364 {
 365         return port && port->port && port->config.type == TB_TYPE_PORT;
 366 }
 367 
 368 static inline bool tb_port_is_pcie_down(const struct tb_port *port)
 369 {
 370         return port && port->config.type == TB_TYPE_PCIE_DOWN;
 371 }
 372 
 373 static inline bool tb_port_is_pcie_up(const struct tb_port *port)
 374 {
 375         return port && port->config.type == TB_TYPE_PCIE_UP;
 376 }
 377 
 378 static inline bool tb_port_is_dpin(const struct tb_port *port)
 379 {
 380         return port && port->config.type == TB_TYPE_DP_HDMI_IN;
 381 }
 382 
 383 static inline bool tb_port_is_dpout(const struct tb_port *port)
 384 {
 385         return port && port->config.type == TB_TYPE_DP_HDMI_OUT;
 386 }
 387 
 388 static inline int tb_sw_read(struct tb_switch *sw, void *buffer,
 389                              enum tb_cfg_space space, u32 offset, u32 length)
 390 {
 391         if (sw->is_unplugged)
 392                 return -ENODEV;
 393         return tb_cfg_read(sw->tb->ctl,
 394                            buffer,
 395                            tb_route(sw),
 396                            0,
 397                            space,
 398                            offset,
 399                            length);
 400 }
 401 
 402 static inline int tb_sw_write(struct tb_switch *sw, void *buffer,
 403                               enum tb_cfg_space space, u32 offset, u32 length)
 404 {
 405         if (sw->is_unplugged)
 406                 return -ENODEV;
 407         return tb_cfg_write(sw->tb->ctl,
 408                             buffer,
 409                             tb_route(sw),
 410                             0,
 411                             space,
 412                             offset,
 413                             length);
 414 }
 415 
 416 static inline int tb_port_read(struct tb_port *port, void *buffer,
 417                                enum tb_cfg_space space, u32 offset, u32 length)
 418 {
 419         if (port->sw->is_unplugged)
 420                 return -ENODEV;
 421         return tb_cfg_read(port->sw->tb->ctl,
 422                            buffer,
 423                            tb_route(port->sw),
 424                            port->port,
 425                            space,
 426                            offset,
 427                            length);
 428 }
 429 
 430 static inline int tb_port_write(struct tb_port *port, const void *buffer,
 431                                 enum tb_cfg_space space, u32 offset, u32 length)
 432 {
 433         if (port->sw->is_unplugged)
 434                 return -ENODEV;
 435         return tb_cfg_write(port->sw->tb->ctl,
 436                             buffer,
 437                             tb_route(port->sw),
 438                             port->port,
 439                             space,
 440                             offset,
 441                             length);
 442 }
 443 
 444 #define tb_err(tb, fmt, arg...) dev_err(&(tb)->nhi->pdev->dev, fmt, ## arg)
 445 #define tb_WARN(tb, fmt, arg...) dev_WARN(&(tb)->nhi->pdev->dev, fmt, ## arg)
 446 #define tb_warn(tb, fmt, arg...) dev_warn(&(tb)->nhi->pdev->dev, fmt, ## arg)
 447 #define tb_info(tb, fmt, arg...) dev_info(&(tb)->nhi->pdev->dev, fmt, ## arg)
 448 #define tb_dbg(tb, fmt, arg...) dev_dbg(&(tb)->nhi->pdev->dev, fmt, ## arg)
 449 
 450 #define __TB_SW_PRINT(level, sw, fmt, arg...)           \
 451         do {                                            \
 452                 const struct tb_switch *__sw = (sw);    \
 453                 level(__sw->tb, "%llx: " fmt,           \
 454                       tb_route(__sw), ## arg);          \
 455         } while (0)
 456 #define tb_sw_WARN(sw, fmt, arg...) __TB_SW_PRINT(tb_WARN, sw, fmt, ##arg)
 457 #define tb_sw_warn(sw, fmt, arg...) __TB_SW_PRINT(tb_warn, sw, fmt, ##arg)
 458 #define tb_sw_info(sw, fmt, arg...) __TB_SW_PRINT(tb_info, sw, fmt, ##arg)
 459 #define tb_sw_dbg(sw, fmt, arg...) __TB_SW_PRINT(tb_dbg, sw, fmt, ##arg)
 460 
 461 #define __TB_PORT_PRINT(level, _port, fmt, arg...)                      \
 462         do {                                                            \
 463                 const struct tb_port *__port = (_port);                 \
 464                 level(__port->sw->tb, "%llx:%x: " fmt,                  \
 465                       tb_route(__port->sw), __port->port, ## arg);      \
 466         } while (0)
 467 #define tb_port_WARN(port, fmt, arg...) \
 468         __TB_PORT_PRINT(tb_WARN, port, fmt, ##arg)
 469 #define tb_port_warn(port, fmt, arg...) \
 470         __TB_PORT_PRINT(tb_warn, port, fmt, ##arg)
 471 #define tb_port_info(port, fmt, arg...) \
 472         __TB_PORT_PRINT(tb_info, port, fmt, ##arg)
 473 #define tb_port_dbg(port, fmt, arg...) \
 474         __TB_PORT_PRINT(tb_dbg, port, fmt, ##arg)
 475 
 476 struct tb *icm_probe(struct tb_nhi *nhi);
 477 struct tb *tb_probe(struct tb_nhi *nhi);
 478 
 479 extern struct device_type tb_domain_type;
 480 extern struct device_type tb_switch_type;
 481 
 482 int tb_domain_init(void);
 483 void tb_domain_exit(void);
 484 void tb_switch_exit(void);
 485 int tb_xdomain_init(void);
 486 void tb_xdomain_exit(void);
 487 
 488 struct tb *tb_domain_alloc(struct tb_nhi *nhi, size_t privsize);
 489 int tb_domain_add(struct tb *tb);
 490 void tb_domain_remove(struct tb *tb);
 491 int tb_domain_suspend_noirq(struct tb *tb);
 492 int tb_domain_resume_noirq(struct tb *tb);
 493 int tb_domain_suspend(struct tb *tb);
 494 void tb_domain_complete(struct tb *tb);
 495 int tb_domain_runtime_suspend(struct tb *tb);
 496 int tb_domain_runtime_resume(struct tb *tb);
 497 int tb_domain_approve_switch(struct tb *tb, struct tb_switch *sw);
 498 int tb_domain_approve_switch_key(struct tb *tb, struct tb_switch *sw);
 499 int tb_domain_challenge_switch_key(struct tb *tb, struct tb_switch *sw);
 500 int tb_domain_disconnect_pcie_paths(struct tb *tb);
 501 int tb_domain_approve_xdomain_paths(struct tb *tb, struct tb_xdomain *xd);
 502 int tb_domain_disconnect_xdomain_paths(struct tb *tb, struct tb_xdomain *xd);
 503 int tb_domain_disconnect_all_paths(struct tb *tb);
 504 
 505 static inline struct tb *tb_domain_get(struct tb *tb)
 506 {
 507         if (tb)
 508                 get_device(&tb->dev);
 509         return tb;
 510 }
 511 
 512 static inline void tb_domain_put(struct tb *tb)
 513 {
 514         put_device(&tb->dev);
 515 }
 516 
 517 struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent,
 518                                   u64 route);
 519 struct tb_switch *tb_switch_alloc_safe_mode(struct tb *tb,
 520                         struct device *parent, u64 route);
 521 int tb_switch_configure(struct tb_switch *sw);
 522 int tb_switch_add(struct tb_switch *sw);
 523 void tb_switch_remove(struct tb_switch *sw);
 524 void tb_switch_suspend(struct tb_switch *sw);
 525 int tb_switch_resume(struct tb_switch *sw);
 526 int tb_switch_reset(struct tb *tb, u64 route);
 527 void tb_sw_set_unplugged(struct tb_switch *sw);
 528 struct tb_switch *tb_switch_find_by_link_depth(struct tb *tb, u8 link,
 529                                                u8 depth);
 530 struct tb_switch *tb_switch_find_by_uuid(struct tb *tb, const uuid_t *uuid);
 531 struct tb_switch *tb_switch_find_by_route(struct tb *tb, u64 route);
 532 
 533 static inline struct tb_switch *tb_switch_get(struct tb_switch *sw)
 534 {
 535         if (sw)
 536                 get_device(&sw->dev);
 537         return sw;
 538 }
 539 
 540 static inline void tb_switch_put(struct tb_switch *sw)
 541 {
 542         put_device(&sw->dev);
 543 }
 544 
 545 static inline bool tb_is_switch(const struct device *dev)
 546 {
 547         return dev->type == &tb_switch_type;
 548 }
 549 
 550 static inline struct tb_switch *tb_to_switch(struct device *dev)
 551 {
 552         if (tb_is_switch(dev))
 553                 return container_of(dev, struct tb_switch, dev);
 554         return NULL;
 555 }
 556 
 557 static inline struct tb_switch *tb_switch_parent(struct tb_switch *sw)
 558 {
 559         return tb_to_switch(sw->dev.parent);
 560 }
 561 
 562 static inline bool tb_switch_is_lr(const struct tb_switch *sw)
 563 {
 564         return sw->config.device_id == PCI_DEVICE_ID_INTEL_LIGHT_RIDGE;
 565 }
 566 
 567 static inline bool tb_switch_is_er(const struct tb_switch *sw)
 568 {
 569         return sw->config.device_id == PCI_DEVICE_ID_INTEL_EAGLE_RIDGE;
 570 }
 571 
 572 static inline bool tb_switch_is_cr(const struct tb_switch *sw)
 573 {
 574         switch (sw->config.device_id) {
 575         case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_2C:
 576         case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C:
 577                 return true;
 578         default:
 579                 return false;
 580         }
 581 }
 582 
 583 static inline bool tb_switch_is_fr(const struct tb_switch *sw)
 584 {
 585         switch (sw->config.device_id) {
 586         case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_BRIDGE:
 587         case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_BRIDGE:
 588                 return true;
 589         default:
 590                 return false;
 591         }
 592 }
 593 
 594 int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged);
 595 int tb_port_add_nfc_credits(struct tb_port *port, int credits);
 596 int tb_port_set_initial_credits(struct tb_port *port, u32 credits);
 597 int tb_port_clear_counter(struct tb_port *port, int counter);
 598 int tb_port_alloc_in_hopid(struct tb_port *port, int hopid, int max_hopid);
 599 void tb_port_release_in_hopid(struct tb_port *port, int hopid);
 600 int tb_port_alloc_out_hopid(struct tb_port *port, int hopid, int max_hopid);
 601 void tb_port_release_out_hopid(struct tb_port *port, int hopid);
 602 struct tb_port *tb_next_port_on_path(struct tb_port *start, struct tb_port *end,
 603                                      struct tb_port *prev);
 604 
 605 int tb_switch_find_vse_cap(struct tb_switch *sw, enum tb_switch_vse_cap vsec);
 606 int tb_port_find_cap(struct tb_port *port, enum tb_port_cap cap);
 607 bool tb_port_is_enabled(struct tb_port *port);
 608 
 609 bool tb_pci_port_is_enabled(struct tb_port *port);
 610 int tb_pci_port_enable(struct tb_port *port, bool enable);
 611 
 612 int tb_dp_port_hpd_is_active(struct tb_port *port);
 613 int tb_dp_port_hpd_clear(struct tb_port *port);
 614 int tb_dp_port_set_hops(struct tb_port *port, unsigned int video,
 615                         unsigned int aux_tx, unsigned int aux_rx);
 616 bool tb_dp_port_is_enabled(struct tb_port *port);
 617 int tb_dp_port_enable(struct tb_port *port, bool enable);
 618 
 619 struct tb_path *tb_path_discover(struct tb_port *src, int src_hopid,
 620                                  struct tb_port *dst, int dst_hopid,
 621                                  struct tb_port **last, const char *name);
 622 struct tb_path *tb_path_alloc(struct tb *tb, struct tb_port *src, int src_hopid,
 623                               struct tb_port *dst, int dst_hopid, int link_nr,
 624                               const char *name);
 625 void tb_path_free(struct tb_path *path);
 626 int tb_path_activate(struct tb_path *path);
 627 void tb_path_deactivate(struct tb_path *path);
 628 bool tb_path_is_invalid(struct tb_path *path);
 629 
 630 int tb_drom_read(struct tb_switch *sw);
 631 int tb_drom_read_uid_only(struct tb_switch *sw, u64 *uid);
 632 
 633 int tb_lc_read_uuid(struct tb_switch *sw, u32 *uuid);
 634 int tb_lc_configure_link(struct tb_switch *sw);
 635 void tb_lc_unconfigure_link(struct tb_switch *sw);
 636 int tb_lc_set_sleep(struct tb_switch *sw);
 637 
 638 static inline int tb_route_length(u64 route)
 639 {
 640         return (fls64(route) + TB_ROUTE_SHIFT - 1) / TB_ROUTE_SHIFT;
 641 }
 642 
 643 /**
 644  * tb_downstream_route() - get route to downstream switch
 645  *
 646  * Port must not be the upstream port (otherwise a loop is created).
 647  *
 648  * Return: Returns a route to the switch behind @port.
 649  */
 650 static inline u64 tb_downstream_route(struct tb_port *port)
 651 {
 652         return tb_route(port->sw)
 653                | ((u64) port->port << (port->sw->config.depth * 8));
 654 }
 655 
 656 bool tb_xdomain_handle_request(struct tb *tb, enum tb_cfg_pkg_type type,
 657                                const void *buf, size_t size);
 658 struct tb_xdomain *tb_xdomain_alloc(struct tb *tb, struct device *parent,
 659                                     u64 route, const uuid_t *local_uuid,
 660                                     const uuid_t *remote_uuid);
 661 void tb_xdomain_add(struct tb_xdomain *xd);
 662 void tb_xdomain_remove(struct tb_xdomain *xd);
 663 struct tb_xdomain *tb_xdomain_find_by_link_depth(struct tb *tb, u8 link,
 664                                                  u8 depth);
 665 
 666 #endif