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Subject[char-misc-next 12/13] mei: docs: add vtag ioctl documentation
Date
Add structured documenation for the new vtag ioctl

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
---
Documentation/driver-api/mei/mei.rst | 37 ++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)

diff --git a/Documentation/driver-api/mei/mei.rst b/Documentation/driver-api/mei/mei.rst
index c800d8e5f422..cea0b69ec216 100644
--- a/Documentation/driver-api/mei/mei.rst
+++ b/Documentation/driver-api/mei/mei.rst
@@ -42,6 +42,11 @@ The session is terminated calling :c:func:`close(int fd)`.

A code snippet for an application communicating with Intel AMTHI client:

+In order to support virtualization or sandboxing a trusted supervisor
+can use :c:macro:`MEI_CONNECT_CLIENT_IOCTL_VTAG` to create
+virtual channels with an Intel ME feature. Not all features support
+virtual channels such client with answer EOPNOTSUPP.
+
.. code-block:: C

struct mei_connect_client_data data;
@@ -110,6 +115,38 @@ Connect to firmware Feature/Client.
data that can be sent or received. (e.g. if MTU=2K, can send
requests up to bytes 2k and received responses up to 2k bytes).

+IOCTL_MEI_CONNECT_CLIENT_VTAG:
+------------------------------
+
+.. code-block:: none
+
+ Usage:
+
+ struct mei_connect_client_data_vtag client_data_vtag;
+
+ ioctl(fd, IOCTL_MEI_CONNECT_CLIENT_VTAG, &client_data_vtag);
+
+ Inputs:
+
+ struct mei_connect_client_data_vtag - contain the following
+ Input field:
+
+ in_client_uuid - GUID of the FW Feature that needs
+ to connect to.
+ vtag - virtual tag [1, 255]
+
+ Outputs:
+ out_client_properties - Client Properties: MTU and Protocol Version.
+
+ Error returns:
+
+ ENOTTY No such client (i.e. wrong GUID) or connection is not allowed.
+ EINVAL Wrong IOCTL Number or tag == 0
+ ENODEV Device or Connection is not initialized or ready.
+ ENOMEM Unable to allocate memory to client internal data.
+ EFAULT Fatal Error (e.g. Unable to access user input data)
+ EBUSY Connection Already Open
+ EOPNOTSUPP Vtag is not supported

IOCTL_MEI_NOTIFY_SET
---------------------
--
2.25.4
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