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docs: vhost-user-gpu: add protocol changes for dmabuf modifiers

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VHOST_USER_GPU_DMABUF_SCANOUT2 is defined as a message with all the
contents of VHOST_USER_GPU_DMABUF_SCANOUT plus the dmabuf modifiers
which were ommitted.

The VHOST_USER_GPU_PROTOCOL_F_DMABUF2 protocol feature is defined as a
way to check whether this new message is supported or not.

Signed-off-by: Erico Nunes <ernunes@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Sergio Lopez <slp@redhat.com>
Message-Id: <20230714153900.475857-2-ernunes@redhat.com>
This commit is contained in:
Erico Nunes 2023-07-14 17:38:58 +02:00 committed by Marc-André Lureau
parent 9ef497755a
commit 75f217b4ad
1 changed files with 25 additions and 1 deletions
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26
docs/interop/vhost-user-gpu.rst
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@ -134,6 +134,19 @@ VhostUserGpuEdidRequest
:scanout-id: ``u32``, the scanout to get edid from
VhostUserGpuDMABUFScanout2
^^^^^^^^^^^^^^^^^^^^^^^^^^
+----------------+----------+
| dmabuf_scanout | modifier |
+----------------+----------+
:dmabuf_scanout: ``VhostUserGpuDMABUFScanout``, filled as described in the
VhostUserGpuDMABUFScanout structure.
:modifier: ``u64``, the DMABUF modifiers
C structure
-----------
@ -163,7 +176,8 @@ Protocol features
.. code:: c
#define VHOST_USER_GPU_PROTOCOL_F_EDID 0
#define VHOST_USER_GPU_PROTOCOL_F_EDID 0
#define VHOST_USER_GPU_PROTOCOL_F_DMABUF2 1
New messages and communication changes are negotiated thanks to the
``VHOST_USER_GPU_GET_PROTOCOL_FEATURES`` and
@ -263,3 +277,13 @@ Message types
Retrieve the EDID data for a given scanout.
This message requires the ``VHOST_USER_GPU_PROTOCOL_F_EDID`` protocol
feature to be supported.
``VHOST_USER_GPU_DMABUF_SCANOUT2``
:id: 12
:request payload: ``VhostUserGpuDMABUFScanout2``
:reply payload: N/A
Same as VHOST_USER_GPU_DMABUF_SCANOUT, but also sends the dmabuf modifiers
appended to the message, which were not provided in the other message.
This message requires the ``VHOST_USER_GPU_PROTOCOL_F_DMABUF2`` protocol
feature to be supported.