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146bf4e75e
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. Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com> Signed-off-by: Olivier Masse <olivier.masse@nxp.com> Reviewed-by: Sumit Garg <sumit.garg@oss.qualcomm.com> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.