drivers/thunderbolt/tb.h

   1 /*
   2  * Thunderbolt Cactus Ridge driver - bus logic (NHI independent)
   3  *
   4  * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
   5  */
   6
   7 #ifndef TB_H_
   8 #define TB_H_
   9
  10 #include <linux/nvmem-provider.h>
  11 #include <linux/pci.h>
  12 #include <linux/uuid.h>
  13
  14 #include "tb_regs.h"
  15 #include "ctl.h"
  16 #include "dma_port.h"
  17
  18 /**
  19  * struct tb_switch_nvm - Structure holding switch NVM information
  20  * @major: Major version number of the active NVM portion
  21  * @minor: Minor version number of the active NVM portion
  22  * @id: Identifier used with both NVM portions
  23  * @active: Active portion NVMem device
  24  * @non_active: Non-active portion NVMem device
  25  * @buf: Buffer where the NVM image is stored before it is written to
  26  *       the actual NVM flash device
  27  * @buf_data_size: Number of bytes actually consumed by the new NVM
  28  *                 image
  29  * @authenticating: The switch is authenticating the new NVM
  30  */
  31 struct tb_switch_nvm {
  32         u8 major;
  33         u8 minor;
  34         int id;
  35         struct nvmem_device *active;
  36         struct nvmem_device *non_active;
  37         void *buf;
  38         size_t buf_data_size;
  39         bool authenticating;
  40 };
  41
  42 /**
  43  * enum tb_security_level - Thunderbolt security level
  44  * @TB_SECURITY_NONE: No security, legacy mode
  45  * @TB_SECURITY_USER: User approval required at minimum
  46  * @TB_SECURITY_SECURE: One time saved key required at minimum
  47  * @TB_SECURITY_DPONLY: Only tunnel Display port (and USB)
  48  */
  49 enum tb_security_level {
  50         TB_SECURITY_NONE,
  51         TB_SECURITY_USER,
  52         TB_SECURITY_SECURE,
  53         TB_SECURITY_DPONLY,
  54 };
  55
  56 #define TB_SWITCH_KEY_SIZE              32
  57 /* Each physical port contains 2 links on modern controllers */
  58 #define TB_SWITCH_LINKS_PER_PHY_PORT    2
  59
  60 /**
  61  * struct tb_switch - a thunderbolt switch
  62  * @dev: Device for the switch
  63  * @config: Switch configuration
  64  * @ports: Ports in this switch
  65  * @dma_port: If the switch has port supporting DMA configuration based
  66  *            mailbox this will hold the pointer to that (%NULL
  67  *            otherwise). If set it also means the switch has
  68  *            upgradeable NVM.
  69  * @tb: Pointer to the domain the switch belongs to
  70  * @uid: Unique ID of the switch
  71  * @uuid: UUID of the switch (or %NULL if not supported)
  72  * @vendor: Vendor ID of the switch
  73  * @device: Device ID of the switch
  74  * @vendor_name: Name of the vendor (or %NULL if not known)
  75  * @device_name: Name of the device (or %NULL if not known)
  76  * @generation: Switch Thunderbolt generation
  77  * @cap_plug_events: Offset to the plug events capability (%0 if not found)
  78  * @is_unplugged: The switch is going away
  79  * @drom: DROM of the switch (%NULL if not found)
  80  * @nvm: Pointer to the NVM if the switch has one (%NULL otherwise)
  81  * @no_nvm_upgrade: Prevent NVM upgrade of this switch
  82  * @safe_mode: The switch is in safe-mode
  83  * @authorized: Whether the switch is authorized by user or policy
  84  * @work: Work used to automatically authorize a switch
  85  * @security_level: Switch supported security level
  86  * @key: Contains the key used to challenge the device or %NULL if not
  87  *       supported. Size of the key is %TB_SWITCH_KEY_SIZE.
  88  * @connection_id: Connection ID used with ICM messaging
  89  * @connection_key: Connection key used with ICM messaging
  90  * @link: Root switch link this switch is connected (ICM only)
  91  * @depth: Depth in the chain this switch is connected (ICM only)
  92  *
  93  * When the switch is being added or removed to the domain (other
  94  * switches) you need to have domain lock held. For switch authorization
  95  * internal switch_lock is enough.
  96  */
  97 struct tb_switch {
  98         struct device dev;
  99         struct tb_regs_switch_header config;
 100         struct tb_port *ports;
 101         struct tb_dma_port *dma_port;
 102         struct tb *tb;
 103         u64 uid;
 104         uuid_be *uuid;
 105         u16 vendor;
 106         u16 device;
 107         const char *vendor_name;
 108         const char *device_name;
 109         unsigned int generation;
 110         int cap_plug_events;
 111         bool is_unplugged;
 112         u8 *drom;
 113         struct tb_switch_nvm *nvm;
 114         bool no_nvm_upgrade;
 115         bool safe_mode;
 116         unsigned int authorized;
 117         struct work_struct work;
 118         enum tb_security_level security_level;
 119         u8 *key;
 120         u8 connection_id;
 121         u8 connection_key;
 122         u8 link;
 123         u8 depth;
 124 };
 125
 126 /**
 127  * struct tb_port - a thunderbolt port, part of a tb_switch
 128  */
 129 struct tb_port {
 130         struct tb_regs_port_header config;
 131         struct tb_switch *sw;
 132         struct tb_port *remote; /* remote port, NULL if not connected */
 133         int cap_phy; /* offset, zero if not found */
 134         u8 port; /* port number on switch */
 135         bool disabled; /* disabled by eeprom */
 136         struct tb_port *dual_link_port;
 137         u8 link_nr:1;
 138 };
 139
 140 /**
 141  * struct tb_path_hop - routing information for a tb_path
 142  *
 143  * Hop configuration is always done on the IN port of a switch.
 144  * in_port and out_port have to be on the same switch. Packets arriving on
 145  * in_port with "hop" = in_hop_index will get routed to through out_port. The
 146  * next hop to take (on out_port->remote) is determined by next_hop_index.
 147  *
 148  * in_counter_index is the index of a counter (in TB_CFG_COUNTERS) on the in
 149  * port.
 150  */
 151 struct tb_path_hop {
 152         struct tb_port *in_port;
 153         struct tb_port *out_port;
 154         int in_hop_index;
 155         int in_counter_index; /* write -1 to disable counters for this hop. */
 156         int next_hop_index;
 157 };
 158
 159 /**
 160  * enum tb_path_port - path options mask
 161  */
 162 enum tb_path_port {
 163         TB_PATH_NONE = 0,
 164         TB_PATH_SOURCE = 1, /* activate on the first hop (out of src) */
 165         TB_PATH_INTERNAL = 2, /* activate on other hops (not the first/last) */
 166         TB_PATH_DESTINATION = 4, /* activate on the last hop (into dst) */
 167         TB_PATH_ALL = 7,
 168 };
 169
 170 /**
 171  * struct tb_path - a unidirectional path between two ports
 172  *
 173  * A path consists of a number of hops (see tb_path_hop). To establish a PCIe
 174  * tunnel two paths have to be created between the two PCIe ports.
 175  *
 176  */
 177 struct tb_path {
 178         struct tb *tb;
 179         int nfc_credits; /* non flow controlled credits */
 180         enum tb_path_port ingress_shared_buffer;
 181         enum tb_path_port egress_shared_buffer;
 182         enum tb_path_port ingress_fc_enable;
 183         enum tb_path_port egress_fc_enable;
 184
 185         int priority:3;
 186         int weight:4;
 187         bool drop_packages;
 188         bool activated;
 189         struct tb_path_hop *hops;
 190         int path_length; /* number of hops */
 191 };
 192
 193 /**
 194  * struct tb_cm_ops - Connection manager specific operations vector
 195  * @driver_ready: Called right after control channel is started. Used by
 196  *                ICM to send driver ready message to the firmware.
 197  * @start: Starts the domain
 198  * @stop: Stops the domain
 199  * @suspend_noirq: Connection manager specific suspend_noirq
 200  * @resume_noirq: Connection manager specific resume_noirq
 201  * @suspend: Connection manager specific suspend
 202  * @complete: Connection manager specific complete
 203  * @handle_event: Handle thunderbolt event
 204  * @approve_switch: Approve switch
 205  * @add_switch_key: Add key to switch
 206  * @challenge_switch_key: Challenge switch using key
 207  * @disconnect_pcie_paths: Disconnects PCIe paths before NVM update
 208  */
 209 struct tb_cm_ops {
 210         int (*driver_ready)(struct tb *tb);
 211         int (*start)(struct tb *tb);
 212         void (*stop)(struct tb *tb);
 213         int (*suspend_noirq)(struct tb *tb);
 214         int (*resume_noirq)(struct tb *tb);
 215         int (*suspend)(struct tb *tb);
 216         void (*complete)(struct tb *tb);
 217         void (*handle_event)(struct tb *tb, enum tb_cfg_pkg_type,
 218                              const void *buf, size_t size);
 219         int (*approve_switch)(struct tb *tb, struct tb_switch *sw);
 220         int (*add_switch_key)(struct tb *tb, struct tb_switch *sw);
 221         int (*challenge_switch_key)(struct tb *tb, struct tb_switch *sw,
 222                                     const u8 *challenge, u8 *response);
 223         int (*disconnect_pcie_paths)(struct tb *tb);
 224 };
 225
 226 /**
 227  * struct tb - main thunderbolt bus structure
 228  * @dev: Domain device
 229  * @lock: Big lock. Must be held when accessing any struct
 230  *        tb_switch / struct tb_port.
 231  * @nhi: Pointer to the NHI structure
 232  * @ctl: Control channel for this domain
 233  * @wq: Ordered workqueue for all domain specific work
 234  * @root_switch: Root switch of this domain
 235  * @cm_ops: Connection manager specific operations vector
 236  * @index: Linux assigned domain number
 237  * @security_level: Current security level
 238  * @privdata: Private connection manager specific data
 239  */
 240 struct tb {
 241         struct device dev;
 242         struct mutex lock;
 243         struct tb_nhi *nhi;
 244         struct tb_ctl *ctl;
 245         struct workqueue_struct *wq;
 246         struct tb_switch *root_switch;
 247         const struct tb_cm_ops *cm_ops;
 248         int index;
 249         enum tb_security_level security_level;
 250         unsigned long privdata[0];
 251 };
 252
 253 static inline void *tb_priv(struct tb *tb)
 254 {
 255         return (void *)tb->privdata;
 256 }
 257
 258 /* helper functions & macros */
 259
 260 /**
 261  * tb_upstream_port() - return the upstream port of a switch
 262  *
 263  * Every switch has an upstream port (for the root switch it is the NHI).
 264  *
 265  * During switch alloc/init tb_upstream_port()->remote may be NULL, even for
 266  * non root switches (on the NHI port remote is always NULL).
 267  *
 268  * Return: Returns the upstream port of the switch.
 269  */
 270 static inline struct tb_port *tb_upstream_port(struct tb_switch *sw)
 271 {
 272         return &sw->ports[sw->config.upstream_port_number];
 273 }
 274
 275 static inline u64 tb_route(struct tb_switch *sw)
 276 {
 277         return ((u64) sw->config.route_hi) << 32 | sw->config.route_lo;
 278 }
 279
 280 static inline struct tb_port *tb_port_at(u64 route, struct tb_switch *sw)
 281 {
 282         u8 port;
 283
 284         port = route >> (sw->config.depth * 8);
 285         if (WARN_ON(port > sw->config.max_port_number))
 286                 return NULL;
 287         return &sw->ports[port];
 288 }
 289
 290 static inline int tb_sw_read(struct tb_switch *sw, void *buffer,
 291                              enum tb_cfg_space space, u32 offset, u32 length)
 292 {
 293         return tb_cfg_read(sw->tb->ctl,
 294                            buffer,
 295                            tb_route(sw),
 296                            0,
 297                            space,
 298                            offset,
 299                            length);
 300 }
 301
 302 static inline int tb_sw_write(struct tb_switch *sw, void *buffer,
 303                               enum tb_cfg_space space, u32 offset, u32 length)
 304 {
 305         return tb_cfg_write(sw->tb->ctl,
 306                             buffer,
 307                             tb_route(sw),
 308                             0,
 309                             space,
 310                             offset,
 311                             length);
 312 }
 313
 314 static inline int tb_port_read(struct tb_port *port, void *buffer,
 315                                enum tb_cfg_space space, u32 offset, u32 length)
 316 {
 317         return tb_cfg_read(port->sw->tb->ctl,
 318                            buffer,
 319                            tb_route(port->sw),
 320                            port->port,
 321                            space,
 322                            offset,
 323                            length);
 324 }
 325
 326 static inline int tb_port_write(struct tb_port *port, const void *buffer,
 327                                 enum tb_cfg_space space, u32 offset, u32 length)
 328 {
 329         return tb_cfg_write(port->sw->tb->ctl,
 330                             buffer,
 331                             tb_route(port->sw),
 332                             port->port,
 333                             space,
 334                             offset,
 335                             length);
 336 }
 337
 338 #define tb_err(tb, fmt, arg...) dev_err(&(tb)->nhi->pdev->dev, fmt, ## arg)
 339 #define tb_WARN(tb, fmt, arg...) dev_WARN(&(tb)->nhi->pdev->dev, fmt, ## arg)
 340 #define tb_warn(tb, fmt, arg...) dev_warn(&(tb)->nhi->pdev->dev, fmt, ## arg)
 341 #define tb_info(tb, fmt, arg...) dev_info(&(tb)->nhi->pdev->dev, fmt, ## arg)
 342
 343
 344 #define __TB_SW_PRINT(level, sw, fmt, arg...)           \
 345         do {                                            \
 346                 struct tb_switch *__sw = (sw);          \
 347                 level(__sw->tb, "%llx: " fmt,           \
 348                       tb_route(__sw), ## arg);          \
 349         } while (0)
 350 #define tb_sw_WARN(sw, fmt, arg...) __TB_SW_PRINT(tb_WARN, sw, fmt, ##arg)
 351 #define tb_sw_warn(sw, fmt, arg...) __TB_SW_PRINT(tb_warn, sw, fmt, ##arg)
 352 #define tb_sw_info(sw, fmt, arg...) __TB_SW_PRINT(tb_info, sw, fmt, ##arg)
 353
 354
 355 #define __TB_PORT_PRINT(level, _port, fmt, arg...)                      \
 356         do {                                                            \
 357                 struct tb_port *__port = (_port);                       \
 358                 level(__port->sw->tb, "%llx:%x: " fmt,                  \
 359                       tb_route(__port->sw), __port->port, ## arg);      \
 360         } while (0)
 361 #define tb_port_WARN(port, fmt, arg...) \
 362         __TB_PORT_PRINT(tb_WARN, port, fmt, ##arg)
 363 #define tb_port_warn(port, fmt, arg...) \
 364         __TB_PORT_PRINT(tb_warn, port, fmt, ##arg)
 365 #define tb_port_info(port, fmt, arg...) \
 366         __TB_PORT_PRINT(tb_info, port, fmt, ##arg)
 367
 368 struct tb *icm_probe(struct tb_nhi *nhi);
 369 struct tb *tb_probe(struct tb_nhi *nhi);
 370
 371 extern struct bus_type tb_bus_type;
 372 extern struct device_type tb_domain_type;
 373 extern struct device_type tb_switch_type;
 374
 375 int tb_domain_init(void);
 376 void tb_domain_exit(void);
 377 void tb_switch_exit(void);
 378
 379 struct tb *tb_domain_alloc(struct tb_nhi *nhi, size_t privsize);
 380 int tb_domain_add(struct tb *tb);
 381 void tb_domain_remove(struct tb *tb);
 382 int tb_domain_suspend_noirq(struct tb *tb);
 383 int tb_domain_resume_noirq(struct tb *tb);
 384 int tb_domain_suspend(struct tb *tb);
 385 void tb_domain_complete(struct tb *tb);
 386 int tb_domain_approve_switch(struct tb *tb, struct tb_switch *sw);
 387 int tb_domain_approve_switch_key(struct tb *tb, struct tb_switch *sw);
 388 int tb_domain_challenge_switch_key(struct tb *tb, struct tb_switch *sw);
 389 int tb_domain_disconnect_pcie_paths(struct tb *tb);
 390
 391 static inline void tb_domain_put(struct tb *tb)
 392 {
 393         put_device(&tb->dev);
 394 }
 395
 396 struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent,
 397                                   u64 route);
 398 struct tb_switch *tb_switch_alloc_safe_mode(struct tb *tb,
 399                         struct device *parent, u64 route);
 400 int tb_switch_configure(struct tb_switch *sw);
 401 int tb_switch_add(struct tb_switch *sw);
 402 void tb_switch_remove(struct tb_switch *sw);
 403 void tb_switch_suspend(struct tb_switch *sw);
 404 int tb_switch_resume(struct tb_switch *sw);
 405 int tb_switch_reset(struct tb *tb, u64 route);
 406 void tb_sw_set_unplugged(struct tb_switch *sw);
 407 struct tb_switch *get_switch_at_route(struct tb_switch *sw, u64 route);
 408 struct tb_switch *tb_switch_find_by_link_depth(struct tb *tb, u8 link,
 409                                                u8 depth);
 410 struct tb_switch *tb_switch_find_by_uuid(struct tb *tb, const uuid_be *uuid);
 411
 412 static inline unsigned int tb_switch_phy_port_from_link(unsigned int link)
 413 {
 414         return (link - 1) / TB_SWITCH_LINKS_PER_PHY_PORT;
 415 }
 416
 417 static inline void tb_switch_put(struct tb_switch *sw)
 418 {
 419         put_device(&sw->dev);
 420 }
 421
 422 static inline bool tb_is_switch(const struct device *dev)
 423 {
 424         return dev->type == &tb_switch_type;
 425 }
 426
 427 static inline struct tb_switch *tb_to_switch(struct device *dev)
 428 {
 429         if (tb_is_switch(dev))
 430                 return container_of(dev, struct tb_switch, dev);
 431         return NULL;
 432 }
 433
 434 int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged);
 435 int tb_port_add_nfc_credits(struct tb_port *port, int credits);
 436 int tb_port_clear_counter(struct tb_port *port, int counter);
 437
 438 int tb_switch_find_vse_cap(struct tb_switch *sw, enum tb_switch_vse_cap vsec);
 439 int tb_port_find_cap(struct tb_port *port, enum tb_port_cap cap);
 440
 441 struct tb_path *tb_path_alloc(struct tb *tb, int num_hops);
 442 void tb_path_free(struct tb_path *path);
 443 int tb_path_activate(struct tb_path *path);
 444 void tb_path_deactivate(struct tb_path *path);
 445 bool tb_path_is_invalid(struct tb_path *path);
 446
 447 int tb_drom_read(struct tb_switch *sw);
 448 int tb_drom_read_uid_only(struct tb_switch *sw, u64 *uid);
 449
 450
 451 static inline int tb_route_length(u64 route)
 452 {
 453         return (fls64(route) + TB_ROUTE_SHIFT - 1) / TB_ROUTE_SHIFT;
 454 }
 455
 456 static inline bool tb_is_upstream_port(struct tb_port *port)
 457 {
 458         return port == tb_upstream_port(port->sw);
 459 }
 460
 461 /**
 462  * tb_downstream_route() - get route to downstream switch
 463  *
 464  * Port must not be the upstream port (otherwise a loop is created).
 465  *
 466  * Return: Returns a route to the switch behind @port.
 467  */
 468 static inline u64 tb_downstream_route(struct tb_port *port)
 469 {
 470         return tb_route(port->sw)
 471                | ((u64) port->port << (port->sw->config.depth * 8));
 472 }
 473
 474 #endif