31e1314cee
[ Upstream commit 00aa6e65aa04e500a11a2c91e92a11c37b9e234d ] Multiple threads or clients can submit a command to the TEE ring buffer. This patch helps to synchronize command submission to the ring. One thread shall write a command to a TEE ring buffer entry only if: - Trusted OS has notified that the TEE command for the given entry has been processed and driver has copied the TEE response into client buffer. - The command entry is empty and can be written into. After a command has been written to the TEE ring buffer, the global wptr (mutex protected) shall be incremented for use by next client. If PSP became unresponsive while processing TEE request from a client, then further command submission to queue will be disabled. Fixes: 33960acccfbd (crypto: ccp - add TEE support for Raven Ridge) Reviewed-by: Devaraj Rangasamy <Devaraj.Rangasamy@amd.com> Signed-off-by: Rijo Thomas <Rijo-john.Thomas@amd.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Sasha Levin <sashal@kernel.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 Restructured Text 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.