1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (c) 2015-2022 Linaro Limited
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>
19 * The file describes the API provided by the generic TEE driver to the
20 * specific TEE driver.
23 #define TEE_SHM_DYNAMIC BIT(0) /* Dynamic shared memory registered */
25 #define TEE_SHM_USER_MAPPED BIT(1) /* Memory mapped in user space */
26 #define TEE_SHM_POOL BIT(2) /* Memory allocated from pool */
27 #define TEE_SHM_PRIV BIT(3) /* Memory private to TEE driver */
35 * struct tee_context - driver specific context on file pointer data
36 * @teedev: pointer to this drivers struct tee_device
37 * @list_shm: List of shared memory object owned by this context
38 * @data: driver specific context data, managed by the driver
39 * @refcount: reference counter for this structure
40 * @releasing: flag that indicates if context is being released right now.
41 * It is needed to break circular dependency on context during
42 * shared memory release.
43 * @supp_nowait: flag that indicates that requests in this context should not
44 * wait for tee-supplicant daemon to be started if not present
45 * and just return with an error code. It is needed for requests
46 * that arises from TEE based kernel drivers that should be
47 * non-blocking in nature.
48 * @cap_memref_null: flag indicating if the TEE Client support shared
49 * memory buffer with a NULL pointer.
52 struct tee_device *teedev;
60 struct tee_param_memref {
66 struct tee_param_value {
75 struct tee_param_memref memref;
76 struct tee_param_value value;
81 * struct tee_driver_ops - driver operations vtable
82 * @get_version: returns version of driver
83 * @open: called when the device file is opened
84 * @release: release this open file
85 * @open_session: open a new session
86 * @close_session: close a session
87 * @invoke_func: invoke a trusted function
88 * @cancel_req: request cancel of an ongoing invoke or open
89 * @supp_recv: called for supplicant to get a command
90 * @supp_send: called for supplicant to send a response
91 * @shm_register: register shared memory buffer in TEE
92 * @shm_unregister: unregister shared memory buffer in TEE
94 struct tee_driver_ops {
95 void (*get_version)(struct tee_device *teedev,
96 struct tee_ioctl_version_data *vers);
97 int (*open)(struct tee_context *ctx);
98 void (*release)(struct tee_context *ctx);
99 int (*open_session)(struct tee_context *ctx,
100 struct tee_ioctl_open_session_arg *arg,
101 struct tee_param *param);
102 int (*close_session)(struct tee_context *ctx, u32 session);
103 int (*invoke_func)(struct tee_context *ctx,
104 struct tee_ioctl_invoke_arg *arg,
105 struct tee_param *param);
106 int (*cancel_req)(struct tee_context *ctx, u32 cancel_id, u32 session);
107 int (*supp_recv)(struct tee_context *ctx, u32 *func, u32 *num_params,
108 struct tee_param *param);
109 int (*supp_send)(struct tee_context *ctx, u32 ret, u32 num_params,
110 struct tee_param *param);
111 int (*shm_register)(struct tee_context *ctx, struct tee_shm *shm,
112 struct page **pages, size_t num_pages,
113 unsigned long start);
114 int (*shm_unregister)(struct tee_context *ctx, struct tee_shm *shm);
118 * struct tee_desc - Describes the TEE driver to the subsystem
119 * @name: name of driver
120 * @ops: driver operations vtable
121 * @owner: module providing the driver
122 * @flags: Extra properties of driver, defined by TEE_DESC_* below
124 #define TEE_DESC_PRIVILEGED 0x1
127 const struct tee_driver_ops *ops;
128 struct module *owner;
133 * tee_device_alloc() - Allocate a new struct tee_device instance
134 * @teedesc: Descriptor for this driver
135 * @dev: Parent device for this device
136 * @pool: Shared memory pool, NULL if not used
137 * @driver_data: Private driver data for this device
139 * Allocates a new struct tee_device instance. The device is
140 * removed by tee_device_unregister().
142 * @returns a pointer to a 'struct tee_device' or an ERR_PTR on failure
144 struct tee_device *tee_device_alloc(const struct tee_desc *teedesc,
146 struct tee_shm_pool *pool,
150 * tee_device_register() - Registers a TEE device
151 * @teedev: Device to register
153 * tee_device_unregister() need to be called to remove the @teedev if
154 * this function fails.
156 * @returns < 0 on failure
158 int tee_device_register(struct tee_device *teedev);
161 * tee_device_unregister() - Removes a TEE device
162 * @teedev: Device to unregister
164 * This function should be called to remove the @teedev even if
165 * tee_device_register() hasn't been called yet. Does nothing if
168 void tee_device_unregister(struct tee_device *teedev);
171 * tee_session_calc_client_uuid() - Calculates client UUID for session
172 * @uuid: Resulting UUID
173 * @connection_method: Connection method for session (TEE_IOCTL_LOGIN_*)
174 * @connectuon_data: Connection data for opening session
176 * Based on connection method calculates UUIDv5 based client UUID.
178 * For group based logins verifies that calling process has specified
181 * @return < 0 on failure
183 int tee_session_calc_client_uuid(uuid_t *uuid, u32 connection_method,
184 const u8 connection_data[TEE_IOCTL_UUID_LEN]);
187 * struct tee_shm - shared memory object
188 * @ctx: context using the object
189 * @paddr: physical address of the shared memory
190 * @kaddr: virtual address of the shared memory
191 * @size: size of shared memory
192 * @offset: offset of buffer in user space
193 * @pages: locked pages from userspace
194 * @num_pages: number of locked pages
195 * @refcount: reference counter
196 * @flags: defined by TEE_SHM_* in tee_drv.h
197 * @id: unique id of a shared memory object on this device, shared
200 * secure world assigned id of this shared memory object, not
201 * used by all drivers
203 * This pool is only supposed to be accessed directly from the TEE
204 * subsystem and from drivers that implements their own shm pool manager.
207 struct tee_context *ctx;
221 * struct tee_shm_pool - shared memory pool
223 * @private_data: private data for the shared memory manager
225 struct tee_shm_pool {
226 const struct tee_shm_pool_ops *ops;
231 * struct tee_shm_pool_ops - shared memory pool operations
232 * @alloc: called when allocating shared memory
233 * @free: called when freeing shared memory
234 * @destroy_pool: called when destroying the pool
236 struct tee_shm_pool_ops {
237 int (*alloc)(struct tee_shm_pool *pool, struct tee_shm *shm,
238 size_t size, size_t align);
239 void (*free)(struct tee_shm_pool *pool, struct tee_shm *shm);
240 void (*destroy_pool)(struct tee_shm_pool *pool);
244 * tee_shm_pool_alloc_res_mem() - Create a shm manager for reserved memory
245 * @vaddr: Virtual address of start of pool
246 * @paddr: Physical address of start of pool
247 * @size: Size in bytes of the pool
249 * @returns pointer to a 'struct tee_shm_pool' or an ERR_PTR on failure.
251 struct tee_shm_pool *tee_shm_pool_alloc_res_mem(unsigned long vaddr,
252 phys_addr_t paddr, size_t size,
253 int min_alloc_order);
256 * tee_shm_pool_free() - Free a shared memory pool
257 * @pool: The shared memory pool to free
259 * The must be no remaining shared memory allocated from this pool when
260 * this function is called.
262 static inline void tee_shm_pool_free(struct tee_shm_pool *pool)
264 pool->ops->destroy_pool(pool);
268 * tee_get_drvdata() - Return driver_data pointer
269 * @returns the driver_data pointer supplied to tee_register().
271 void *tee_get_drvdata(struct tee_device *teedev);
273 struct tee_shm *tee_shm_alloc_priv_buf(struct tee_context *ctx, size_t size);
274 struct tee_shm *tee_shm_alloc_kernel_buf(struct tee_context *ctx, size_t size);
276 struct tee_shm *tee_shm_register_kernel_buf(struct tee_context *ctx,
277 void *addr, size_t length);
280 * tee_shm_is_dynamic() - Check if shared memory object is of the dynamic kind
281 * @shm: Shared memory handle
282 * @returns true if object is dynamic shared memory
284 static inline bool tee_shm_is_dynamic(struct tee_shm *shm)
286 return shm && (shm->flags & TEE_SHM_DYNAMIC);
290 * tee_shm_free() - Free shared memory
291 * @shm: Handle to shared memory to free
293 void tee_shm_free(struct tee_shm *shm);
296 * tee_shm_put() - Decrease reference count on a shared memory handle
297 * @shm: Shared memory handle
299 void tee_shm_put(struct tee_shm *shm);
302 * tee_shm_get_va() - Get virtual address of a shared memory plus an offset
303 * @shm: Shared memory handle
304 * @offs: Offset from start of this shared memory
305 * @returns virtual address of the shared memory + offs if offs is within
306 * the bounds of this shared memory, else an ERR_PTR
308 void *tee_shm_get_va(struct tee_shm *shm, size_t offs);
311 * tee_shm_get_pa() - Get physical address of a shared memory plus an offset
312 * @shm: Shared memory handle
313 * @offs: Offset from start of this shared memory
314 * @pa: Physical address to return
315 * @returns 0 if offs is within the bounds of this shared memory, else an
318 int tee_shm_get_pa(struct tee_shm *shm, size_t offs, phys_addr_t *pa);
321 * tee_shm_get_size() - Get size of shared memory buffer
322 * @shm: Shared memory handle
323 * @returns size of shared memory
325 static inline size_t tee_shm_get_size(struct tee_shm *shm)
331 * tee_shm_get_pages() - Get list of pages that hold shared buffer
332 * @shm: Shared memory handle
333 * @num_pages: Number of pages will be stored there
334 * @returns pointer to pages array
336 static inline struct page **tee_shm_get_pages(struct tee_shm *shm,
339 *num_pages = shm->num_pages;
344 * tee_shm_get_page_offset() - Get shared buffer offset from page start
345 * @shm: Shared memory handle
346 * @returns page offset of shared buffer
348 static inline size_t tee_shm_get_page_offset(struct tee_shm *shm)
354 * tee_shm_get_id() - Get id of a shared memory object
355 * @shm: Shared memory handle
358 static inline int tee_shm_get_id(struct tee_shm *shm)
364 * tee_shm_get_from_id() - Find shared memory object and increase reference
366 * @ctx: Context owning the shared memory
367 * @id: Id of shared memory object
368 * @returns a pointer to 'struct tee_shm' on success or an ERR_PTR on failure
370 struct tee_shm *tee_shm_get_from_id(struct tee_context *ctx, int id);
373 * tee_client_open_context() - Open a TEE context
374 * @start: if not NULL, continue search after this context
375 * @match: function to check TEE device
376 * @data: data for match function
377 * @vers: if not NULL, version data of TEE device of the context returned
379 * This function does an operation similar to open("/dev/teeX") in user space.
380 * A returned context must be released with tee_client_close_context().
382 * Returns a TEE context of the first TEE device matched by the match()
383 * callback or an ERR_PTR.
386 tee_client_open_context(struct tee_context *start,
387 int (*match)(struct tee_ioctl_version_data *,
389 const void *data, struct tee_ioctl_version_data *vers);
392 * tee_client_close_context() - Close a TEE context
393 * @ctx: TEE context to close
395 * Note that all sessions previously opened with this context will be
396 * closed when this function is called.
398 void tee_client_close_context(struct tee_context *ctx);
401 * tee_client_get_version() - Query version of TEE
402 * @ctx: TEE context to TEE to query
403 * @vers: Pointer to version data
405 void tee_client_get_version(struct tee_context *ctx,
406 struct tee_ioctl_version_data *vers);
409 * tee_client_open_session() - Open a session to a Trusted Application
411 * @arg: Open session arguments, see description of
412 * struct tee_ioctl_open_session_arg
413 * @param: Parameters passed to the Trusted Application
415 * Returns < 0 on error else see @arg->ret for result. If @arg->ret
416 * is TEEC_SUCCESS the session identifier is available in @arg->session.
418 int tee_client_open_session(struct tee_context *ctx,
419 struct tee_ioctl_open_session_arg *arg,
420 struct tee_param *param);
423 * tee_client_close_session() - Close a session to a Trusted Application
425 * @session: Session id
427 * Return < 0 on error else 0, regardless the session will not be
428 * valid after this function has returned.
430 int tee_client_close_session(struct tee_context *ctx, u32 session);
433 * tee_client_invoke_func() - Invoke a function in a Trusted Application
435 * @arg: Invoke arguments, see description of
436 * struct tee_ioctl_invoke_arg
437 * @param: Parameters passed to the Trusted Application
439 * Returns < 0 on error else see @arg->ret for result.
441 int tee_client_invoke_func(struct tee_context *ctx,
442 struct tee_ioctl_invoke_arg *arg,
443 struct tee_param *param);
446 * tee_client_cancel_req() - Request cancellation of the previous open-session
447 * or invoke-command operations in a Trusted Application
449 * @arg: Cancellation arguments, see description of
450 * struct tee_ioctl_cancel_arg
452 * Returns < 0 on error else 0 if the cancellation was successfully requested.
454 int tee_client_cancel_req(struct tee_context *ctx,
455 struct tee_ioctl_cancel_arg *arg);
457 static inline bool tee_param_is_memref(struct tee_param *param)
459 switch (param->attr & TEE_IOCTL_PARAM_ATTR_TYPE_MASK) {
460 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT:
461 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
462 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
469 extern struct bus_type tee_bus_type;
472 * struct tee_client_device - tee based device
473 * @id: device identifier
474 * @dev: device structure
476 struct tee_client_device {
477 struct tee_client_device_id id;
481 #define to_tee_client_device(d) container_of(d, struct tee_client_device, dev)
484 * struct tee_client_driver - tee client driver
485 * @id_table: device id table supported by this driver
486 * @driver: driver structure
488 struct tee_client_driver {
489 const struct tee_client_device_id *id_table;
490 struct device_driver driver;
493 #define to_tee_client_driver(d) \
494 container_of(d, struct tee_client_driver, driver)
497 * teedev_open() - Open a struct tee_device
498 * @teedev: Device to open
500 * @return a pointer to struct tee_context on success or an ERR_PTR on failure.
502 struct tee_context *teedev_open(struct tee_device *teedev);
505 * teedev_close_context() - closes a struct tee_context
506 * @ctx: The struct tee_context to close
508 void teedev_close_context(struct tee_context *ctx);
510 #endif /*__TEE_DRV_H*/