include/linux/thunderbolt.h

   1 /*
   2  * Thunderbolt service API
   3  *
   4  * Copyright (C) 2014 Andreas Noever <andreas.noever@gmail.com>
   5  * Copyright (C) 2017, Intel Corporation
   6  * Authors: Michael Jamet <michael.jamet@intel.com>
   7  *          Mika Westerberg <mika.westerberg@linux.intel.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #ifndef THUNDERBOLT_H_
  15 #define THUNDERBOLT_H_
  16
  17 #include <linux/device.h>
  18 #include <linux/idr.h>
  19 #include <linux/list.h>
  20 #include <linux/mutex.h>
  21 #include <linux/mod_devicetable.h>
  22 #include <linux/pci.h>
  23 #include <linux/uuid.h>
  24 #include <linux/workqueue.h>
  25
  26 enum tb_cfg_pkg_type {
  27         TB_CFG_PKG_READ = 1,
  28         TB_CFG_PKG_WRITE = 2,
  29         TB_CFG_PKG_ERROR = 3,
  30         TB_CFG_PKG_NOTIFY_ACK = 4,
  31         TB_CFG_PKG_EVENT = 5,
  32         TB_CFG_PKG_XDOMAIN_REQ = 6,
  33         TB_CFG_PKG_XDOMAIN_RESP = 7,
  34         TB_CFG_PKG_OVERRIDE = 8,
  35         TB_CFG_PKG_RESET = 9,
  36         TB_CFG_PKG_ICM_EVENT = 10,
  37         TB_CFG_PKG_ICM_CMD = 11,
  38         TB_CFG_PKG_ICM_RESP = 12,
  39         TB_CFG_PKG_PREPARE_TO_SLEEP = 13,
  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 /**
  57  * struct tb - main thunderbolt bus structure
  58  * @dev: Domain device
  59  * @lock: Big lock. Must be held when accessing any struct
  60  *        tb_switch / struct tb_port.
  61  * @nhi: Pointer to the NHI structure
  62  * @ctl: Control channel for this domain
  63  * @wq: Ordered workqueue for all domain specific work
  64  * @root_switch: Root switch of this domain
  65  * @cm_ops: Connection manager specific operations vector
  66  * @index: Linux assigned domain number
  67  * @security_level: Current security level
  68  * @privdata: Private connection manager specific data
  69  */
  70 struct tb {
  71         struct device dev;
  72         struct mutex lock;
  73         struct tb_nhi *nhi;
  74         struct tb_ctl *ctl;
  75         struct workqueue_struct *wq;
  76         struct tb_switch *root_switch;
  77         const struct tb_cm_ops *cm_ops;
  78         int index;
  79         enum tb_security_level security_level;
  80         unsigned long privdata[0];
  81 };
  82
  83 extern struct bus_type tb_bus_type;
  84 extern struct device_type tb_service_type;
  85 extern struct device_type tb_xdomain_type;
  86
  87 #define TB_LINKS_PER_PHY_PORT   2
  88
  89 static inline unsigned int tb_phy_port_from_link(unsigned int link)
  90 {
  91         return (link - 1) / TB_LINKS_PER_PHY_PORT;
  92 }
  93
  94 /**
  95  * struct tb_property_dir - XDomain property directory
  96  * @uuid: Directory UUID or %NULL if root directory
  97  * @properties: List of properties in this directory
  98  *
  99  * User needs to provide serialization if needed.
 100  */
 101 struct tb_property_dir {
 102         const uuid_t *uuid;
 103         struct list_head properties;
 104 };
 105
 106 enum tb_property_type {
 107         TB_PROPERTY_TYPE_UNKNOWN = 0x00,
 108         TB_PROPERTY_TYPE_DIRECTORY = 0x44,
 109         TB_PROPERTY_TYPE_DATA = 0x64,
 110         TB_PROPERTY_TYPE_TEXT = 0x74,
 111         TB_PROPERTY_TYPE_VALUE = 0x76,
 112 };
 113
 114 #define TB_PROPERTY_KEY_SIZE    8
 115
 116 /**
 117  * struct tb_property - XDomain property
 118  * @list: Used to link properties together in a directory
 119  * @key: Key for the property (always terminated).
 120  * @type: Type of the property
 121  * @length: Length of the property data in dwords
 122  * @value: Property value
 123  *
 124  * Users use @type to determine which field in @value is filled.
 125  */
 126 struct tb_property {
 127         struct list_head list;
 128         char key[TB_PROPERTY_KEY_SIZE + 1];
 129         enum tb_property_type type;
 130         size_t length;
 131         union {
 132                 struct tb_property_dir *dir;
 133                 u8 *data;
 134                 char *text;
 135                 u32 immediate;
 136         } value;
 137 };
 138
 139 struct tb_property_dir *tb_property_parse_dir(const u32 *block,
 140                                               size_t block_len);
 141 ssize_t tb_property_format_dir(const struct tb_property_dir *dir, u32 *block,
 142                                size_t block_len);
 143 struct tb_property_dir *tb_property_create_dir(const uuid_t *uuid);
 144 void tb_property_free_dir(struct tb_property_dir *dir);
 145 int tb_property_add_immediate(struct tb_property_dir *parent, const char *key,
 146                               u32 value);
 147 int tb_property_add_data(struct tb_property_dir *parent, const char *key,
 148                          const void *buf, size_t buflen);
 149 int tb_property_add_text(struct tb_property_dir *parent, const char *key,
 150                          const char *text);
 151 int tb_property_add_dir(struct tb_property_dir *parent, const char *key,
 152                         struct tb_property_dir *dir);
 153 void tb_property_remove(struct tb_property *tb_property);
 154 struct tb_property *tb_property_find(struct tb_property_dir *dir,
 155                         const char *key, enum tb_property_type type);
 156 struct tb_property *tb_property_get_next(struct tb_property_dir *dir,
 157                                          struct tb_property *prev);
 158
 159 #define tb_property_for_each(dir, property)                     \
 160         for (property = tb_property_get_next(dir, NULL);        \
 161              property;                                          \
 162              property = tb_property_get_next(dir, property))
 163
 164 int tb_register_property_dir(const char *key, struct tb_property_dir *dir);
 165 void tb_unregister_property_dir(const char *key, struct tb_property_dir *dir);
 166
 167 /**
 168  * struct tb_xdomain - Cross-domain (XDomain) connection
 169  * @dev: XDomain device
 170  * @tb: Pointer to the domain
 171  * @remote_uuid: UUID of the remote domain (host)
 172  * @local_uuid: Cached local UUID
 173  * @route: Route string the other domain can be reached
 174  * @vendor: Vendor ID of the remote domain
 175  * @device: Device ID of the demote domain
 176  * @lock: Lock to serialize access to the following fields of this structure
 177  * @vendor_name: Name of the vendor (or %NULL if not known)
 178  * @device_name: Name of the device (or %NULL if not known)
 179  * @is_unplugged: The XDomain is unplugged
 180  * @resume: The XDomain is being resumed
 181  * @transmit_path: HopID which the remote end expects us to transmit
 182  * @transmit_ring: Local ring (hop) where outgoing packets are pushed
 183  * @receive_path: HopID which we expect the remote end to transmit
 184  * @receive_ring: Local ring (hop) where incoming packets arrive
 185  * @service_ids: Used to generate IDs for the services
 186  * @properties: Properties exported by the remote domain
 187  * @property_block_gen: Generation of @properties
 188  * @properties_lock: Lock protecting @properties.
 189  * @get_properties_work: Work used to get remote domain properties
 190  * @properties_retries: Number of times left to read properties
 191  * @properties_changed_work: Work used to notify the remote domain that
 192  *                           our properties have changed
 193  * @properties_changed_retries: Number of times left to send properties
 194  *                              changed notification
 195  * @link: Root switch link the remote domain is connected (ICM only)
 196  * @depth: Depth in the chain the remote domain is connected (ICM only)
 197  *
 198  * This structure represents connection across two domains (hosts).
 199  * Each XDomain contains zero or more services which are exposed as
 200  * &struct tb_service objects.
 201  *
 202  * Service drivers may access this structure if they need to enumerate
 203  * non-standard properties but they need hold @lock when doing so
 204  * because properties can be changed asynchronously in response to
 205  * changes in the remote domain.
 206  */
 207 struct tb_xdomain {
 208         struct device dev;
 209         struct tb *tb;
 210         uuid_t *remote_uuid;
 211         const uuid_t *local_uuid;
 212         u64 route;
 213         u16 vendor;
 214         u16 device;
 215         struct mutex lock;
 216         const char *vendor_name;
 217         const char *device_name;
 218         bool is_unplugged;
 219         bool resume;
 220         u16 transmit_path;
 221         u16 transmit_ring;
 222         u16 receive_path;
 223         u16 receive_ring;
 224         struct ida service_ids;
 225         struct tb_property_dir *properties;
 226         u32 property_block_gen;
 227         struct delayed_work get_properties_work;
 228         int properties_retries;
 229         struct delayed_work properties_changed_work;
 230         int properties_changed_retries;
 231         u8 link;
 232         u8 depth;
 233 };
 234
 235 int tb_xdomain_enable_paths(struct tb_xdomain *xd, u16 transmit_path,
 236                             u16 transmit_ring, u16 receive_path,
 237                             u16 receive_ring);
 238 int tb_xdomain_disable_paths(struct tb_xdomain *xd);
 239 struct tb_xdomain *tb_xdomain_find_by_uuid(struct tb *tb, const uuid_t *uuid);
 240
 241 static inline struct tb_xdomain *
 242 tb_xdomain_find_by_uuid_locked(struct tb *tb, const uuid_t *uuid)
 243 {
 244         struct tb_xdomain *xd;
 245
 246         mutex_lock(&tb->lock);
 247         xd = tb_xdomain_find_by_uuid(tb, uuid);
 248         mutex_unlock(&tb->lock);
 249
 250         return xd;
 251 }
 252
 253 static inline struct tb_xdomain *tb_xdomain_get(struct tb_xdomain *xd)
 254 {
 255         if (xd)
 256                 get_device(&xd->dev);
 257         return xd;
 258 }
 259
 260 static inline void tb_xdomain_put(struct tb_xdomain *xd)
 261 {
 262         if (xd)
 263                 put_device(&xd->dev);
 264 }
 265
 266 static inline bool tb_is_xdomain(const struct device *dev)
 267 {
 268         return dev->type == &tb_xdomain_type;
 269 }
 270
 271 static inline struct tb_xdomain *tb_to_xdomain(struct device *dev)
 272 {
 273         if (tb_is_xdomain(dev))
 274                 return container_of(dev, struct tb_xdomain, dev);
 275         return NULL;
 276 }
 277
 278 int tb_xdomain_response(struct tb_xdomain *xd, const void *response,
 279                         size_t size, enum tb_cfg_pkg_type type);
 280 int tb_xdomain_request(struct tb_xdomain *xd, const void *request,
 281                        size_t request_size, enum tb_cfg_pkg_type request_type,
 282                        void *response, size_t response_size,
 283                        enum tb_cfg_pkg_type response_type,
 284                        unsigned int timeout_msec);
 285
 286 /**
 287  * tb_protocol_handler - Protocol specific handler
 288  * @uuid: XDomain messages with this UUID are dispatched to this handler
 289  * @callback: Callback called with the XDomain message. Returning %1
 290  *            here tells the XDomain core that the message was handled
 291  *            by this handler and should not be forwared to other
 292  *            handlers.
 293  * @data: Data passed with the callback
 294  * @list: Handlers are linked using this
 295  *
 296  * Thunderbolt services can hook into incoming XDomain requests by
 297  * registering protocol handler. Only limitation is that the XDomain
 298  * discovery protocol UUID cannot be registered since it is handled by
 299  * the core XDomain code.
 300  *
 301  * The @callback must check that the message is really directed to the
 302  * service the driver implements.
 303  */
 304 struct tb_protocol_handler {
 305         const uuid_t *uuid;
 306         int (*callback)(const void *buf, size_t size, void *data);
 307         void *data;
 308         struct list_head list;
 309 };
 310
 311 int tb_register_protocol_handler(struct tb_protocol_handler *handler);
 312 void tb_unregister_protocol_handler(struct tb_protocol_handler *handler);
 313
 314 /**
 315  * struct tb_service - Thunderbolt service
 316  * @dev: XDomain device
 317  * @id: ID of the service (shown in sysfs)
 318  * @key: Protocol key from the properties directory
 319  * @prtcid: Protocol ID from the properties directory
 320  * @prtcvers: Protocol version from the properties directory
 321  * @prtcrevs: Protocol software revision from the properties directory
 322  * @prtcstns: Protocol settings mask from the properties directory
 323  *
 324  * Each domain exposes set of services it supports as collection of
 325  * properties. For each service there will be one corresponding
 326  * &struct tb_service. Service drivers are bound to these.
 327  */
 328 struct tb_service {
 329         struct device dev;
 330         int id;
 331         const char *key;
 332         u32 prtcid;
 333         u32 prtcvers;
 334         u32 prtcrevs;
 335         u32 prtcstns;
 336 };
 337
 338 static inline struct tb_service *tb_service_get(struct tb_service *svc)
 339 {
 340         if (svc)
 341                 get_device(&svc->dev);
 342         return svc;
 343 }
 344
 345 static inline void tb_service_put(struct tb_service *svc)
 346 {
 347         if (svc)
 348                 put_device(&svc->dev);
 349 }
 350
 351 static inline bool tb_is_service(const struct device *dev)
 352 {
 353         return dev->type == &tb_service_type;
 354 }
 355
 356 static inline struct tb_service *tb_to_service(struct device *dev)
 357 {
 358         if (tb_is_service(dev))
 359                 return container_of(dev, struct tb_service, dev);
 360         return NULL;
 361 }
 362
 363 /**
 364  * tb_service_driver - Thunderbolt service driver
 365  * @driver: Driver structure
 366  * @probe: Called when the driver is probed
 367  * @remove: Called when the driver is removed (optional)
 368  * @shutdown: Called at shutdown time to stop the service (optional)
 369  * @id_table: Table of service identifiers the driver supports
 370  */
 371 struct tb_service_driver {
 372         struct device_driver driver;
 373         int (*probe)(struct tb_service *svc, const struct tb_service_id *id);
 374         void (*remove)(struct tb_service *svc);
 375         void (*shutdown)(struct tb_service *svc);
 376         const struct tb_service_id *id_table;
 377 };
 378
 379 #define TB_SERVICE(key, id)                             \
 380         .match_flags = TBSVC_MATCH_PROTOCOL_KEY |       \
 381                        TBSVC_MATCH_PROTOCOL_ID,         \
 382         .protocol_key = (key),                          \
 383         .protocol_id = (id)
 384
 385 int tb_register_service_driver(struct tb_service_driver *drv);
 386 void tb_unregister_service_driver(struct tb_service_driver *drv);
 387
 388 static inline void *tb_service_get_drvdata(const struct tb_service *svc)
 389 {
 390         return dev_get_drvdata(&svc->dev);
 391 }
 392
 393 static inline void tb_service_set_drvdata(struct tb_service *svc, void *data)
 394 {
 395         dev_set_drvdata(&svc->dev, data);
 396 }
 397
 398 static inline struct tb_xdomain *tb_service_parent(struct tb_service *svc)
 399 {
 400         return tb_to_xdomain(svc->dev.parent);
 401 }
 402
 403 /**
 404  * struct tb_nhi - thunderbolt native host interface
 405  * @lock: Must be held during ring creation/destruction. Is acquired by
 406  *        interrupt_work when dispatching interrupts to individual rings.
 407  * @pdev: Pointer to the PCI device
 408  * @iobase: MMIO space of the NHI
 409  * @tx_rings: All Tx rings available on this host controller
 410  * @rx_rings: All Rx rings available on this host controller
 411  * @msix_ida: Used to allocate MSI-X vectors for rings
 412  * @going_away: The host controller device is about to disappear so when
 413  *              this flag is set, avoid touching the hardware anymore.
 414  * @interrupt_work: Work scheduled to handle ring interrupt when no
 415  *                  MSI-X is used.
 416  * @hop_count: Number of rings (end point hops) supported by NHI.
 417  */
 418 struct tb_nhi {
 419         spinlock_t lock;
 420         struct pci_dev *pdev;
 421         void __iomem *iobase;
 422         struct tb_ring **tx_rings;
 423         struct tb_ring **rx_rings;
 424         struct ida msix_ida;
 425         bool going_away;
 426         struct work_struct interrupt_work;
 427         u32 hop_count;
 428 };
 429
 430 /**
 431  * struct tb_ring - thunderbolt TX or RX ring associated with a NHI
 432  * @lock: Lock serializing actions to this ring. Must be acquired after
 433  *        nhi->lock.
 434  * @nhi: Pointer to the native host controller interface
 435  * @size: Size of the ring
 436  * @hop: Hop (DMA channel) associated with this ring
 437  * @head: Head of the ring (write next descriptor here)
 438  * @tail: Tail of the ring (complete next descriptor here)
 439  * @descriptors: Allocated descriptors for this ring
 440  * @queue: Queue holding frames to be transferred over this ring
 441  * @in_flight: Queue holding frames that are currently in flight
 442  * @work: Interrupt work structure
 443  * @is_tx: Is the ring Tx or Rx
 444  * @running: Is the ring running
 445  * @irq: MSI-X irq number if the ring uses MSI-X. %0 otherwise.
 446  * @vector: MSI-X vector number the ring uses (only set if @irq is > 0)
 447  * @flags: Ring specific flags
 448  * @sof_mask: Bit mask used to detect start of frame PDF
 449  * @eof_mask: Bit mask used to detect end of frame PDF
 450  * @start_poll: Called when ring interrupt is triggered to start
 451  *              polling. Passing %NULL keeps the ring in interrupt mode.
 452  * @poll_data: Data passed to @start_poll
 453  */
 454 struct tb_ring {
 455         spinlock_t lock;
 456         struct tb_nhi *nhi;
 457         int size;
 458         int hop;
 459         int head;
 460         int tail;
 461         struct ring_desc *descriptors;
 462         dma_addr_t descriptors_dma;
 463         struct list_head queue;
 464         struct list_head in_flight;
 465         struct work_struct work;
 466         bool is_tx:1;
 467         bool running:1;
 468         int irq;
 469         u8 vector;
 470         unsigned int flags;
 471         u16 sof_mask;
 472         u16 eof_mask;
 473         void (*start_poll)(void *data);
 474         void *poll_data;
 475 };
 476
 477 /* Leave ring interrupt enabled on suspend */
 478 #define RING_FLAG_NO_SUSPEND    BIT(0)
 479 /* Configure the ring to be in frame mode */
 480 #define RING_FLAG_FRAME         BIT(1)
 481 /* Enable end-to-end flow control */
 482 #define RING_FLAG_E2E           BIT(2)
 483
 484 struct ring_frame;
 485 typedef void (*ring_cb)(struct tb_ring *, struct ring_frame *, bool canceled);
 486
 487 /**
 488  * enum ring_desc_flags - Flags for DMA ring descriptor
 489  * %RING_DESC_ISOCH: Enable isonchronous DMA (Tx only)
 490  * %RING_DESC_CRC_ERROR: In frame mode CRC check failed for the frame (Rx only)
 491  * %RING_DESC_COMPLETED: Descriptor completed (set by NHI)
 492  * %RING_DESC_POSTED: Always set this
 493  * %RING_DESC_BUFFER_OVERRUN: RX buffer overrun
 494  * %RING_DESC_INTERRUPT: Request an interrupt on completion
 495  */
 496 enum ring_desc_flags {
 497         RING_DESC_ISOCH = 0x1,
 498         RING_DESC_CRC_ERROR = 0x1,
 499         RING_DESC_COMPLETED = 0x2,
 500         RING_DESC_POSTED = 0x4,
 501         RING_DESC_BUFFER_OVERRUN = 0x04,
 502         RING_DESC_INTERRUPT = 0x8,
 503 };
 504
 505 /**
 506  * struct ring_frame - For use with ring_rx/ring_tx
 507  * @buffer_phy: DMA mapped address of the frame
 508  * @callback: Callback called when the frame is finished (optional)
 509  * @list: Frame is linked to a queue using this
 510  * @size: Size of the frame in bytes (%0 means %4096)
 511  * @flags: Flags for the frame (see &enum ring_desc_flags)
 512  * @eof: End of frame protocol defined field
 513  * @sof: Start of frame protocol defined field
 514  */
 515 struct ring_frame {
 516         dma_addr_t buffer_phy;
 517         ring_cb callback;
 518         struct list_head list;
 519         u32 size:12;
 520         u32 flags:12;
 521         u32 eof:4;
 522         u32 sof:4;
 523 };
 524
 525 /* Minimum size for ring_rx */
 526 #define TB_FRAME_SIZE           0x100
 527
 528 struct tb_ring *tb_ring_alloc_tx(struct tb_nhi *nhi, int hop, int size,
 529                                  unsigned int flags);
 530 struct tb_ring *tb_ring_alloc_rx(struct tb_nhi *nhi, int hop, int size,
 531                                  unsigned int flags, u16 sof_mask, u16 eof_mask,
 532                                  void (*start_poll)(void *), void *poll_data);
 533 void tb_ring_start(struct tb_ring *ring);
 534 void tb_ring_stop(struct tb_ring *ring);
 535 void tb_ring_free(struct tb_ring *ring);
 536
 537 int __tb_ring_enqueue(struct tb_ring *ring, struct ring_frame *frame);
 538
 539 /**
 540  * tb_ring_rx() - enqueue a frame on an RX ring
 541  * @ring: Ring to enqueue the frame
 542  * @frame: Frame to enqueue
 543  *
 544  * @frame->buffer, @frame->buffer_phy have to be set. The buffer must
 545  * contain at least %TB_FRAME_SIZE bytes.
 546  *
 547  * @frame->callback will be invoked with @frame->size, @frame->flags,
 548  * @frame->eof, @frame->sof set once the frame has been received.
 549  *
 550  * If ring_stop() is called after the packet has been enqueued
 551  * @frame->callback will be called with canceled set to true.
 552  *
 553  * Return: Returns %-ESHUTDOWN if ring_stop has been called. Zero otherwise.
 554  */
 555 static inline int tb_ring_rx(struct tb_ring *ring, struct ring_frame *frame)
 556 {
 557         WARN_ON(ring->is_tx);
 558         return __tb_ring_enqueue(ring, frame);
 559 }
 560
 561 /**
 562  * tb_ring_tx() - enqueue a frame on an TX ring
 563  * @ring: Ring the enqueue the frame
 564  * @frame: Frame to enqueue
 565  *
 566  * @frame->buffer, @frame->buffer_phy, @frame->size, @frame->eof and
 567  * @frame->sof have to be set.
 568  *
 569  * @frame->callback will be invoked with once the frame has been transmitted.
 570  *
 571  * If ring_stop() is called after the packet has been enqueued @frame->callback
 572  * will be called with canceled set to true.
 573  *
 574  * Return: Returns %-ESHUTDOWN if ring_stop has been called. Zero otherwise.
 575  */
 576 static inline int tb_ring_tx(struct tb_ring *ring, struct ring_frame *frame)
 577 {
 578         WARN_ON(!ring->is_tx);
 579         return __tb_ring_enqueue(ring, frame);
 580 }
 581
 582 /* Used only when the ring is in polling mode */
 583 struct ring_frame *tb_ring_poll(struct tb_ring *ring);
 584 void tb_ring_poll_complete(struct tb_ring *ring);
 585
 586 /**
 587  * tb_ring_dma_device() - Return device used for DMA mapping
 588  * @ring: Ring whose DMA device is retrieved
 589  *
 590  * Use this function when you are mapping DMA for buffers that are
 591  * passed to the ring for sending/receiving.
 592  */
 593 static inline struct device *tb_ring_dma_device(struct tb_ring *ring)
 594 {
 595         return &ring->nhi->pdev->dev;
 596 }
 597
 598 #endif /* THUNDERBOLT_H_ */