From: Sumit Garg <sumit.garg@linaro.org>
To: Maxim Uvarov <maxim.uvarov@linaro.org>
Cc: Jens Wiklander <jens.wiklander@linaro.org>,
Jonathan Corbet <corbet@lwn.net>,
Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
"tee-dev @ lists . linaro . org" <tee-dev@lists.linaro.org>,
Linux Doc Mailing List <linux-doc@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
op-tee@lists.trustedfirmware.org
Subject: Re: [PATCH] Documentation: tee: Document TEE kernel interface
Date: Thu, 4 Jun 2020 12:07:19 +0530 [thread overview]
Message-ID: <CAFA6WYNm+5NGODemHKxQXSNk4m+0P60kr=btTwp9q-6d_6-QPw@mail.gmail.com> (raw)
In-Reply-To: <CAD8XO3Z-JvCYxqbbeGRmjc-KskpykrcfWEGKH9eO6mvG7zHc6Q@mail.gmail.com>
On Wed, 3 Jun 2020 at 20:05, Maxim Uvarov <maxim.uvarov@linaro.org> wrote:
>
> Hello Sumit,
>
> if this doc is for driver developers it might be useful to add some
> code examples how to register drivers on tee bus.
Sure, will add an example TEE client driver snippet for reference.
-Sumit
>
> Best regards,
> Maxim.
>
> On Wed, 3 Jun 2020 at 14:31, Sumit Garg <sumit.garg@linaro.org> wrote:
> >
> > Update documentation with TEE bus infrastructure which provides an
> > interface for kernel client drivers to communicate with corresponding
> > Trusted Application.
> >
> > Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
> > ---
> > Documentation/tee.txt | 30 ++++++++++++++++++++++++++++++
> > 1 file changed, 30 insertions(+)
> >
> > diff --git a/Documentation/tee.txt b/Documentation/tee.txt
> > index c8fad81..428d3b5 100644
> > --- a/Documentation/tee.txt
> > +++ b/Documentation/tee.txt
> > @@ -53,6 +53,28 @@ clients, forward them to the TEE and send back the results. In the case of
> > supplicants the communication goes in the other direction, the TEE sends
> > requests to the supplicant which then sends back the result.
> >
> > +The TEE kernel interface
> > +========================
> > +
> > +Kernel provides a TEE bus infrastructure where a Trusted Application is
> > +represented as a device identified via Universally Unique Identifier (UUID) and
> > +client drivers register a table of supported device UUIDs.
> > +
> > +TEE bus infrastructure registers following APIs:
> > +- match(): iterates over the client driver UUID table to find a corresponding
> > + match for device UUID. If a match is found, then this particular device is
> > + probed via corresponding probe API registered by the client driver. This
> > + process happens whenever a device or a client driver is registered with TEE
> > + bus.
> > +- uevent(): notifies user-space (udev) whenever a new device is registered on
> > + TEE bus for auto-loading of modularized client drivers.
> > +
> > +TEE bus device enumeration is specific to underlying TEE implementation, so it
> > +is left open for TEE drivers to provide corresponding implementation.
> > +
> > +Then TEE client driver can talk to a matched Trusted Application using APIs
> > +listed in include/linux/tee_drv.h.
> > +
> > OP-TEE driver
> > =============
> >
> > @@ -112,6 +134,14 @@ kernel are handled by the kernel driver. Other RPC messages will be forwarded to
> > tee-supplicant without further involvement of the driver, except switching
> > shared memory buffer representation.
> >
> > +OP-TEE device enumeration
> > +-------------------------
> > +
> > +OP-TEE provides a pseudo Trusted Application: drivers/tee/optee/device.c in
> > +order to support device enumeration. In other words, OP-TEE driver invokes this
> > +application to retrieve a list of Trusted Applications which can be registered
> > +as devices on the TEE bus.
> > +
> > AMD-TEE driver
> > ==============
> >
> > --
> > 2.7.4
> >
prev parent reply other threads:[~2020-06-04 6:37 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-03 11:31 [PATCH] Documentation: tee: Document TEE kernel interface Sumit Garg
2020-06-03 14:34 ` Maxim Uvarov
2020-06-04 6:37 ` Sumit Garg [this message]
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