Add a userspace API to create a tee_shm object that refers to a dmabuf reference. Userspace registers the dmabuf file descriptor as in a tee_shm object. The registration is completed with a tee_shm returned file descriptor. Userspace is free to close the dmabuf file descriptor after it has been registered since all the resources are now held via the new tee_shm object. Closing the tee_shm file descriptor will eventually release all resources used by the tee_shm object when all references are released. The new IOCTL, TEE_IOC_SHM_REGISTER_FD, supports dmabuf references to physically contiguous memory buffers. Dmabuf references acquired from the TEE DMA-heap can be used as protected memory for Secure Video Path and such use cases. It depends on the TEE and the TEE driver if dmabuf references acquired by other means can be used. A new tee_shm flag is added to identify tee_shm objects built from a registered dmabuf, TEE_SHM_DMA_BUF.
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| @@ -378,6 +378,37 @@ struct tee_ioctl_shm_register_data { · 377 unmodified lines | ||
| 378 | 378 | __s32 id; |
| 379 | 379 | }; |
| 380 | 380 | |
| 381 | +/** | |
| 382 | + * struct tee_ioctl_shm_register_fd_data - Shared memory registering argument | |
| 383 | + * @fd: [in] File descriptor identifying dmabuf reference | |
| 384 | + * @size: [out] Size of referenced memory | |
| 385 | + * @flags: [in] Flags to/from allocation. | |
| 386 | + * @id: [out] Identifier of the shared memory | |
| 387 | + * | |
| 388 | + * The flags field should currently be zero as input. Updated by the call | |
| 389 | + * with actual flags as defined by TEE_IOCTL_SHM_* above. | |
| 390 | + * This structure is used as argument for TEE_IOC_SHM_REGISTER_FD below. | |
| 391 | + */ | |
| 392 | +struct tee_ioctl_shm_register_fd_data { | |
| 393 | + __s64 fd; | |
| 394 | + __u64 size; | |
| 395 | + __u32 flags; | |
| 396 | + __s32 id; | |
| 397 | +}; | |
| 398 | + | |
| 399 | +/** | |
| 400 | + * TEE_IOC_SHM_REGISTER_FD - register a shared memory from a file descriptor | |
| 401 | + * | |
| 402 | + * Returns a file descriptor on success or < 0 on failure | |
| 403 | + * | |
| 404 | + * The returned file descriptor refers to the shared memory object in the | |
| 405 | + * kernel. The supplied file deccriptor can be closed if it's not needed | |
| 406 | + * for other purposes. The shared memory is freed when the descriptor is | |
| 407 | + * closed. | |
| 408 | + */ | |
| 409 | +#define TEE_IOC_SHM_REGISTER_FD _IOWR(TEE_IOC_MAGIC, TEE_IOC_BASE + 8, \ | |
| 410 | + struct tee_ioctl_shm_register_fd_data) | |
| 411 | + | |
| 381 | 412 | /** |
| 382 | 413 | * TEE_IOC_SHM_REGISTER - Register shared memory argument |
| 383 | 414 | * |