tee: new ioctl to a register tee_shm from a dmabuf file descriptor
This change allows userland to create a tee_shm object that refers to a dmabuf reference. Userland provides a dmabuf file descriptor as buffer reference. The created tee_shm object exported as a brand new dmabuf reference used to provide a clean fd to userland. Userland shall closed this new fd to release the tee_shm object resources. The initial dmabuf resources are tracked independently through original dmabuf file descriptor. Once the buffer is registered and until it is released, TEE driver keeps a refcount on the registered dmabuf structure. This change only support dmabuf references that relates to physically contiguous memory buffers. New tee_shm flag to identify tee_shm objects built from a registered dmabuf: TEE_SHM_EXT_DMA_BUF. Such tee_shm structures are flagged both TEE_SHM_DMA_BUF and TEE_SHM_EXT_DMA_BUF. Signed-off-by: NEtienne Carriere <etienne.carriere@linaro.org> Reviewed-by: NJens Wiklander <jens.wiklander@linaro.org> [jf: squash fixup commit ("tee: fix unbalanced context refcount in register shm from fd")] [jf: rebase onto v5.9-rc8] Signed-off-by: NJerome Forissier <jerome@forissier.org> [jf: rebase onto v5.12] Signed-off-by: NJerome Forissier <jerome@forissier.org>
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