include/linux/tee_drv.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (c) 2015-2016, Linaro Limited
   4  */
   5
   6 #ifndef __TEE_DRV_H
   7 #define __TEE_DRV_H
   8
   9 #include <linux/device.h>
  10 #include <linux/idr.h>
  11 #include <linux/kref.h>
  12 #include <linux/list.h>
  13 #include <linux/mod_devicetable.h>
  14 #include <linux/tee.h>
  15 #include <linux/types.h>
  16 #include <linux/uuid.h>
  17
  18 /*
  19  * The file describes the API provided by the generic TEE driver to the
  20  * specific TEE driver.
  21  */
  22
  23 #define TEE_SHM_MAPPED          BIT(0)  /* Memory mapped by the kernel */
  24 #define TEE_SHM_DMA_BUF         BIT(1)  /* Memory with dma-buf handle */
  25 #define TEE_SHM_EXT_DMA_BUF     BIT(2)  /* Memory with dma-buf handle */
  26 #define TEE_SHM_REGISTER        BIT(3)  /* Memory registered in secure world */
  27 #define TEE_SHM_USER_MAPPED     BIT(4)  /* Memory mapped in user space */
  28 #define TEE_SHM_POOL            BIT(5)  /* Memory allocated from pool */
  29 #define TEE_SHM_KERNEL_MAPPED   BIT(6)  /* Memory mapped in kernel space */
  30
  31 struct device;
  32 struct tee_device;
  33 struct tee_shm;
  34 struct tee_shm_pool;
  35
  36 /**
  37  * struct tee_context - driver specific context on file pointer data
  38  * @teedev:     pointer to this drivers struct tee_device
  39  * @list_shm:   List of shared memory object owned by this context
  40  * @data:       driver specific context data, managed by the driver
  41  * @refcount:   reference counter for this structure
  42  * @releasing:  flag that indicates if context is being released right now.
  43  *              It is needed to break circular dependency on context during
  44  *              shared memory release.
  45  * @supp_nowait: flag that indicates that requests in this context should not
  46  *              wait for tee-supplicant daemon to be started if not present
  47  *              and just return with an error code. It is needed for requests
  48  *              that arises from TEE based kernel drivers that should be
  49  *              non-blocking in nature.
  50  * @cap_memref_null: flag indicating if the TEE Client support shared
  51  *                   memory buffer with a NULL pointer.
  52  */
  53 struct tee_context {
  54         struct tee_device *teedev;
  55         void *data;
  56         struct kref refcount;
  57         bool releasing;
  58         bool supp_nowait;
  59         bool cap_memref_null;
  60 };
  61
  62 struct tee_param_memref {
  63         size_t shm_offs;
  64         size_t size;
  65         struct tee_shm *shm;
  66 };
  67
  68 struct tee_param_value {
  69         u64 a;
  70         u64 b;
  71         u64 c;
  72 };
  73
  74 struct tee_param {
  75         u64 attr;
  76         union {
  77                 struct tee_param_memref memref;
  78                 struct tee_param_value value;
  79         } u;
  80 };
  81
  82 /**
  83  * struct tee_driver_ops - driver operations vtable
  84  * @get_version:        returns version of driver
  85  * @open:               called when the device file is opened
  86  * @release:            release this open file
  87  * @open_session:       open a new session
  88  * @close_session:      close a session
  89  * @invoke_func:        invoke a trusted function
  90  * @cancel_req:         request cancel of an ongoing invoke or open
  91  * @supp_recv:          called for supplicant to get a command
  92  * @supp_send:          called for supplicant to send a response
  93  * @shm_register:       register shared memory buffer in TEE
  94  * @shm_unregister:     unregister shared memory buffer in TEE
  95  */
  96 struct tee_driver_ops {
  97         void (*get_version)(struct tee_device *teedev,
  98                             struct tee_ioctl_version_data *vers);
  99         int (*open)(struct tee_context *ctx);
 100         void (*release)(struct tee_context *ctx);
 101         int (*open_session)(struct tee_context *ctx,
 102                             struct tee_ioctl_open_session_arg *arg,
 103                             struct tee_param *param);
 104         int (*close_session)(struct tee_context *ctx, u32 session);
 105         int (*invoke_func)(struct tee_context *ctx,
 106                            struct tee_ioctl_invoke_arg *arg,
 107                            struct tee_param *param);
 108         int (*cancel_req)(struct tee_context *ctx, u32 cancel_id, u32 session);
 109         int (*supp_recv)(struct tee_context *ctx, u32 *func, u32 *num_params,
 110                          struct tee_param *param);
 111         int (*supp_send)(struct tee_context *ctx, u32 ret, u32 num_params,
 112                          struct tee_param *param);
 113         int (*shm_register)(struct tee_context *ctx, struct tee_shm *shm,
 114                             struct page **pages, size_t num_pages,
 115                             unsigned long start);
 116         int (*shm_unregister)(struct tee_context *ctx, struct tee_shm *shm);
 117 };
 118
 119 /**
 120  * struct tee_desc - Describes the TEE driver to the subsystem
 121  * @name:       name of driver
 122  * @ops:        driver operations vtable
 123  * @owner:      module providing the driver
 124  * @flags:      Extra properties of driver, defined by TEE_DESC_* below
 125  */
 126 #define TEE_DESC_PRIVILEGED     0x1
 127 struct tee_desc {
 128         const char *name;
 129         const struct tee_driver_ops *ops;
 130         struct module *owner;
 131         u32 flags;
 132 };
 133
 134 /**
 135  * tee_device_alloc() - Allocate a new struct tee_device instance
 136  * @teedesc:    Descriptor for this driver
 137  * @dev:        Parent device for this device
 138  * @pool:       Shared memory pool, NULL if not used
 139  * @driver_data: Private driver data for this device
 140  *
 141  * Allocates a new struct tee_device instance. The device is
 142  * removed by tee_device_unregister().
 143  *
 144  * @returns a pointer to a 'struct tee_device' or an ERR_PTR on failure
 145  */
 146 struct tee_device *tee_device_alloc(const struct tee_desc *teedesc,
 147                                     struct device *dev,
 148                                     struct tee_shm_pool *pool,
 149                                     void *driver_data);
 150
 151 /**
 152  * tee_device_register() - Registers a TEE device
 153  * @teedev:     Device to register
 154  *
 155  * tee_device_unregister() need to be called to remove the @teedev if
 156  * this function fails.
 157  *
 158  * @returns < 0 on failure
 159  */
 160 int tee_device_register(struct tee_device *teedev);
 161
 162 /**
 163  * tee_device_unregister() - Removes a TEE device
 164  * @teedev:     Device to unregister
 165  *
 166  * This function should be called to remove the @teedev even if
 167  * tee_device_register() hasn't been called yet. Does nothing if
 168  * @teedev is NULL.
 169  */
 170 void tee_device_unregister(struct tee_device *teedev);
 171
 172 /**
 173  * tee_session_calc_client_uuid() - Calculates client UUID for session
 174  * @uuid:               Resulting UUID
 175  * @connection_method:  Connection method for session (TEE_IOCTL_LOGIN_*)
 176  * @connectuon_data:    Connection data for opening session
 177  *
 178  * Based on connection method calculates UUIDv5 based client UUID.
 179  *
 180  * For group based logins verifies that calling process has specified
 181  * credentials.
 182  *
 183  * @return < 0 on failure
 184  */
 185 int tee_session_calc_client_uuid(uuid_t *uuid, u32 connection_method,
 186                                  const u8 connection_data[TEE_IOCTL_UUID_LEN]);
 187
 188 /**
 189  * struct tee_shm - shared memory object
 190  * @ctx:        context using the object
 191  * @paddr:      physical address of the shared memory
 192  * @kaddr:      virtual address of the shared memory
 193  * @size:       size of shared memory
 194  * @offset:     offset of buffer in user space
 195  * @pages:      locked pages from userspace
 196  * @num_pages:  number of locked pages
 197  * @dmabuf:     dmabuf used to for exporting to user space
 198  * @flags:      defined by TEE_SHM_* in tee_drv.h
 199  * @id:         unique id of a shared memory object on this device
 200  *
 201  * This pool is only supposed to be accessed directly from the TEE
 202  * subsystem and from drivers that implements their own shm pool manager.
 203  */
 204 struct tee_shm {
 205         struct tee_context *ctx;
 206         phys_addr_t paddr;
 207         void *kaddr;
 208         size_t size;
 209         unsigned int offset;
 210         struct page **pages;
 211         size_t num_pages;
 212         struct dma_buf *dmabuf;
 213         u32 flags;
 214         int id;
 215 };
 216
 217 /**
 218  * struct tee_shm_pool_mgr - shared memory manager
 219  * @ops:                operations
 220  * @private_data:       private data for the shared memory manager
 221  */
 222 struct tee_shm_pool_mgr {
 223         const struct tee_shm_pool_mgr_ops *ops;
 224         void *private_data;
 225 };
 226
 227 /**
 228  * struct tee_shm_pool_mgr_ops - shared memory pool manager operations
 229  * @alloc:              called when allocating shared memory
 230  * @free:               called when freeing shared memory
 231  * @destroy_poolmgr:    called when destroying the pool manager
 232  */
 233 struct tee_shm_pool_mgr_ops {
 234         int (*alloc)(struct tee_shm_pool_mgr *poolmgr, struct tee_shm *shm,
 235                      size_t size);
 236         void (*free)(struct tee_shm_pool_mgr *poolmgr, struct tee_shm *shm);
 237         void (*destroy_poolmgr)(struct tee_shm_pool_mgr *poolmgr);
 238 };
 239
 240 /**
 241  * tee_shm_pool_alloc() - Create a shared memory pool from shm managers
 242  * @priv_mgr:   manager for driver private shared memory allocations
 243  * @dmabuf_mgr: manager for dma-buf shared memory allocations
 244  *
 245  * Allocation with the flag TEE_SHM_DMA_BUF set will use the range supplied
 246  * in @dmabuf, others will use the range provided by @priv.
 247  *
 248  * @returns pointer to a 'struct tee_shm_pool' or an ERR_PTR on failure.
 249  */
 250 struct tee_shm_pool *tee_shm_pool_alloc(struct tee_shm_pool_mgr *priv_mgr,
 251                                         struct tee_shm_pool_mgr *dmabuf_mgr);
 252
 253 /*
 254  * tee_shm_pool_mgr_alloc_res_mem() - Create a shm manager for reserved
 255  * memory
 256  * @vaddr:      Virtual address of start of pool
 257  * @paddr:      Physical address of start of pool
 258  * @size:       Size in bytes of the pool
 259  *
 260  * @returns pointer to a 'struct tee_shm_pool_mgr' or an ERR_PTR on failure.
 261  */
 262 struct tee_shm_pool_mgr *tee_shm_pool_mgr_alloc_res_mem(unsigned long vaddr,
 263                                                         phys_addr_t paddr,
 264                                                         size_t size,
 265                                                         int min_alloc_order);
 266
 267 /**
 268  * tee_shm_pool_mgr_destroy() - Free a shared memory manager
 269  */
 270 static inline void tee_shm_pool_mgr_destroy(struct tee_shm_pool_mgr *poolm)
 271 {
 272         poolm->ops->destroy_poolmgr(poolm);
 273 }
 274
 275 /**
 276  * struct tee_shm_pool_mem_info - holds information needed to create a shared
 277  * memory pool
 278  * @vaddr:      Virtual address of start of pool
 279  * @paddr:      Physical address of start of pool
 280  * @size:       Size in bytes of the pool
 281  */
 282 struct tee_shm_pool_mem_info {
 283         unsigned long vaddr;
 284         phys_addr_t paddr;
 285         size_t size;
 286 };
 287
 288 /**
 289  * tee_shm_pool_alloc_res_mem() - Create a shared memory pool from reserved
 290  * memory range
 291  * @priv_info:   Information for driver private shared memory pool
 292  * @dmabuf_info: Information for dma-buf shared memory pool
 293  *
 294  * Start and end of pools will must be page aligned.
 295  *
 296  * Allocation with the flag TEE_SHM_DMA_BUF set will use the range supplied
 297  * in @dmabuf, others will use the range provided by @priv.
 298  *
 299  * @returns pointer to a 'struct tee_shm_pool' or an ERR_PTR on failure.
 300  */
 301 struct tee_shm_pool *
 302 tee_shm_pool_alloc_res_mem(struct tee_shm_pool_mem_info *priv_info,
 303                            struct tee_shm_pool_mem_info *dmabuf_info);
 304
 305 /**
 306  * tee_shm_pool_free() - Free a shared memory pool
 307  * @pool:       The shared memory pool to free
 308  *
 309  * The must be no remaining shared memory allocated from this pool when
 310  * this function is called.
 311  */
 312 void tee_shm_pool_free(struct tee_shm_pool *pool);
 313
 314 /**
 315  * tee_get_drvdata() - Return driver_data pointer
 316  * @returns the driver_data pointer supplied to tee_register().
 317  */
 318 void *tee_get_drvdata(struct tee_device *teedev);
 319
 320 /**
 321  * tee_shm_alloc() - Allocate shared memory
 322  * @ctx:        Context that allocates the shared memory
 323  * @size:       Requested size of shared memory
 324  * @flags:      Flags setting properties for the requested shared memory.
 325  *
 326  * Memory allocated as global shared memory is automatically freed when the
 327  * TEE file pointer is closed. The @flags field uses the bits defined by
 328  * TEE_SHM_* above. TEE_SHM_MAPPED must currently always be set. If
 329  * TEE_SHM_DMA_BUF global shared memory will be allocated and associated
 330  * with a dma-buf handle, else driver private memory.
 331  *
 332  * @returns a pointer to 'struct tee_shm'
 333  */
 334 struct tee_shm *tee_shm_alloc(struct tee_context *ctx, size_t size, u32 flags);
 335
 336 /**
 337  * tee_shm_register() - Register shared memory buffer
 338  * @ctx:        Context that registers the shared memory
 339  * @addr:       Address is userspace of the shared buffer
 340  * @length:     Length of the shared buffer
 341  * @flags:      Flags setting properties for the requested shared memory.
 342  *
 343  * @returns a pointer to 'struct tee_shm'
 344  */
 345 struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr,
 346                                  size_t length, u32 flags);
 347
 348 /**
 349  * tee_shm_is_registered() - Check if shared memory object in registered in TEE
 350  * @shm:        Shared memory handle
 351  * @returns true if object is registered in TEE
 352  */
 353 static inline bool tee_shm_is_registered(struct tee_shm *shm)
 354 {
 355         return shm && (shm->flags & TEE_SHM_REGISTER);
 356 }
 357
 358 /**
 359  * tee_shm_free() - Free shared memory
 360  * @shm:        Handle to shared memory to free
 361  */
 362 void tee_shm_free(struct tee_shm *shm);
 363
 364 /**
 365  * tee_shm_put() - Decrease reference count on a shared memory handle
 366  * @shm:        Shared memory handle
 367  */
 368 void tee_shm_put(struct tee_shm *shm);
 369
 370 /**
 371  * tee_shm_va2pa() - Get physical address of a virtual address
 372  * @shm:        Shared memory handle
 373  * @va:         Virtual address to tranlsate
 374  * @pa:         Returned physical address
 375  * @returns 0 on success and < 0 on failure
 376  */
 377 int tee_shm_va2pa(struct tee_shm *shm, void *va, phys_addr_t *pa);
 378
 379 /**
 380  * tee_shm_pa2va() - Get virtual address of a physical address
 381  * @shm:        Shared memory handle
 382  * @pa:         Physical address to tranlsate
 383  * @va:         Returned virtual address
 384  * @returns 0 on success and < 0 on failure
 385  */
 386 int tee_shm_pa2va(struct tee_shm *shm, phys_addr_t pa, void **va);
 387
 388 /**
 389  * tee_shm_get_va() - Get virtual address of a shared memory plus an offset
 390  * @shm:        Shared memory handle
 391  * @offs:       Offset from start of this shared memory
 392  * @returns virtual address of the shared memory + offs if offs is within
 393  *      the bounds of this shared memory, else an ERR_PTR
 394  */
 395 void *tee_shm_get_va(struct tee_shm *shm, size_t offs);
 396
 397 /**
 398  * tee_shm_get_pa() - Get physical address of a shared memory plus an offset
 399  * @shm:        Shared memory handle
 400  * @offs:       Offset from start of this shared memory
 401  * @pa:         Physical address to return
 402  * @returns 0 if offs is within the bounds of this shared memory, else an
 403  *      error code.
 404  */
 405 int tee_shm_get_pa(struct tee_shm *shm, size_t offs, phys_addr_t *pa);
 406
 407 /**
 408  * tee_shm_get_size() - Get size of shared memory buffer
 409  * @shm:        Shared memory handle
 410  * @returns size of shared memory
 411  */
 412 static inline size_t tee_shm_get_size(struct tee_shm *shm)
 413 {
 414         return shm->size;
 415 }
 416
 417 /**
 418  * tee_shm_get_pages() - Get list of pages that hold shared buffer
 419  * @shm:        Shared memory handle
 420  * @num_pages:  Number of pages will be stored there
 421  * @returns pointer to pages array
 422  */
 423 static inline struct page **tee_shm_get_pages(struct tee_shm *shm,
 424                                               size_t *num_pages)
 425 {
 426         *num_pages = shm->num_pages;
 427         return shm->pages;
 428 }
 429
 430 /**
 431  * tee_shm_get_page_offset() - Get shared buffer offset from page start
 432  * @shm:        Shared memory handle
 433  * @returns page offset of shared buffer
 434  */
 435 static inline size_t tee_shm_get_page_offset(struct tee_shm *shm)
 436 {
 437         return shm->offset;
 438 }
 439
 440 /**
 441  * tee_shm_get_id() - Get id of a shared memory object
 442  * @shm:        Shared memory handle
 443  * @returns id
 444  */
 445 static inline int tee_shm_get_id(struct tee_shm *shm)
 446 {
 447         return shm->id;
 448 }
 449
 450 /**
 451  * tee_shm_get_from_id() - Find shared memory object and increase reference
 452  * count
 453  * @ctx:        Context owning the shared memory
 454  * @id:         Id of shared memory object
 455  * @returns a pointer to 'struct tee_shm' on success or an ERR_PTR on failure
 456  */
 457 struct tee_shm *tee_shm_get_from_id(struct tee_context *ctx, int id);
 458
 459 /**
 460  * tee_client_open_context() - Open a TEE context
 461  * @start:      if not NULL, continue search after this context
 462  * @match:      function to check TEE device
 463  * @data:       data for match function
 464  * @vers:       if not NULL, version data of TEE device of the context returned
 465  *
 466  * This function does an operation similar to open("/dev/teeX") in user space.
 467  * A returned context must be released with tee_client_close_context().
 468  *
 469  * Returns a TEE context of the first TEE device matched by the match()
 470  * callback or an ERR_PTR.
 471  */
 472 struct tee_context *
 473 tee_client_open_context(struct tee_context *start,
 474                         int (*match)(struct tee_ioctl_version_data *,
 475                                      const void *),
 476                         const void *data, struct tee_ioctl_version_data *vers);
 477
 478 /**
 479  * tee_client_close_context() - Close a TEE context
 480  * @ctx:        TEE context to close
 481  *
 482  * Note that all sessions previously opened with this context will be
 483  * closed when this function is called.
 484  */
 485 void tee_client_close_context(struct tee_context *ctx);
 486
 487 /**
 488  * tee_client_get_version() - Query version of TEE
 489  * @ctx:        TEE context to TEE to query
 490  * @vers:       Pointer to version data
 491  */
 492 void tee_client_get_version(struct tee_context *ctx,
 493                             struct tee_ioctl_version_data *vers);
 494
 495 /**
 496  * tee_client_open_session() - Open a session to a Trusted Application
 497  * @ctx:        TEE context
 498  * @arg:        Open session arguments, see description of
 499  *              struct tee_ioctl_open_session_arg
 500  * @param:      Parameters passed to the Trusted Application
 501  *
 502  * Returns < 0 on error else see @arg->ret for result. If @arg->ret
 503  * is TEEC_SUCCESS the session identifier is available in @arg->session.
 504  */
 505 int tee_client_open_session(struct tee_context *ctx,
 506                             struct tee_ioctl_open_session_arg *arg,
 507                             struct tee_param *param);
 508
 509 /**
 510  * tee_client_close_session() - Close a session to a Trusted Application
 511  * @ctx:        TEE Context
 512  * @session:    Session id
 513  *
 514  * Return < 0 on error else 0, regardless the session will not be
 515  * valid after this function has returned.
 516  */
 517 int tee_client_close_session(struct tee_context *ctx, u32 session);
 518
 519 /**
 520  * tee_client_invoke_func() - Invoke a function in a Trusted Application
 521  * @ctx:        TEE Context
 522  * @arg:        Invoke arguments, see description of
 523  *              struct tee_ioctl_invoke_arg
 524  * @param:      Parameters passed to the Trusted Application
 525  *
 526  * Returns < 0 on error else see @arg->ret for result.
 527  */
 528 int tee_client_invoke_func(struct tee_context *ctx,
 529                            struct tee_ioctl_invoke_arg *arg,
 530                            struct tee_param *param);
 531
 532 /**
 533  * tee_client_cancel_req() - Request cancellation of the previous open-session
 534  * or invoke-command operations in a Trusted Application
 535  * @ctx:       TEE Context
 536  * @arg:       Cancellation arguments, see description of
 537  *             struct tee_ioctl_cancel_arg
 538  *
 539  * Returns < 0 on error else 0 if the cancellation was successfully requested.
 540  */
 541 int tee_client_cancel_req(struct tee_context *ctx,
 542                           struct tee_ioctl_cancel_arg *arg);
 543
 544 static inline bool tee_param_is_memref(struct tee_param *param)
 545 {
 546         switch (param->attr & TEE_IOCTL_PARAM_ATTR_TYPE_MASK) {
 547         case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT:
 548         case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
 549         case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
 550                 return true;
 551         default:
 552                 return false;
 553         }
 554 }
 555
 556 extern struct bus_type tee_bus_type;
 557
 558 /**
 559  * struct tee_client_device - tee based device
 560  * @id:                 device identifier
 561  * @dev:                device structure
 562  */
 563 struct tee_client_device {
 564         struct tee_client_device_id id;
 565         struct device dev;
 566 };
 567
 568 #define to_tee_client_device(d) container_of(d, struct tee_client_device, dev)
 569
 570 /**
 571  * struct tee_client_driver - tee client driver
 572  * @id_table:           device id table supported by this driver
 573  * @driver:             driver structure
 574  */
 575 struct tee_client_driver {
 576         const struct tee_client_device_id *id_table;
 577         struct device_driver driver;
 578 };
 579
 580 #define to_tee_client_driver(d) \
 581                 container_of(d, struct tee_client_driver, driver)
 582
 583 #endif /*__TEE_DRV_H*/