Re: [PATCH v3] drm/virtio: add new virtio gpu capset definitions

[Dmitry Osipenko]

On 10/10/23 18:40, Dmitry Osipenko wrote:
> On 10/10/23 16:57, Huang Rui wrote:
>> These definitions are used fro qemu, and qemu imports this marco in the
>> headers to enable gfxstream, venus, cross domain, and drm (native
>> context) for virtio gpu. So it should add them even kernel doesn't use
>> this.
>>
>> Signed-off-by: Huang Rui <ray.huang@xxxxxxx>
>> Reviewed-by: Akihiko Odaki <akihiko.odaki@xxxxxxxxxx>
>> ---
>>
>> Changes V1 -> V2:
>> - Add all capsets including gfxstream and venus in kernel header (Dmitry Osipenko)
>>
>> Changes V2 -> V3:
>> - Add missed capsets including cross domain and drm (native context)
>>   (Dmitry Osipenko)
>>
>> v1: https://lore.kernel.org/lkml/20230915105918.3763061-1-ray.huang@xxxxxxx/
>> v2: https://lore.kernel.org/lkml/20231010032553.1138036-1-ray.huang@xxxxxxx/
>>
>>  include/uapi/linux/virtio_gpu.h | 4 ++++
>>  1 file changed, 4 insertions(+)
>>
>> diff --git a/include/uapi/linux/virtio_gpu.h b/include/uapi/linux/virtio_gpu.h
>> index f556fde07b76..240911c8da31 100644
>> --- a/include/uapi/linux/virtio_gpu.h
>> +++ b/include/uapi/linux/virtio_gpu.h
>> @@ -309,6 +309,10 @@ struct virtio_gpu_cmd_submit {
>>  
>>  #define VIRTIO_GPU_CAPSET_VIRGL 1
>>  #define VIRTIO_GPU_CAPSET_VIRGL2 2
>> +#define VIRTIO_GPU_CAPSET_GFXSTREAM 3
> 
> The GFXSTREAM capset isn't correct, it should be GFXSTREAM_VULKAN in
> accordance to [1] and [2]. There are more capsets for GFXSTREAM.
> 
> [1]
> https://github.com/google/crosvm/blob/main/rutabaga_gfx/src/rutabaga_utils.rs#L172
> 
> [2]
> https://patchwork.kernel.org/project/qemu-devel/patch/20231006010835.444-7-gurchetansingh@xxxxxxxxxxxx/

Though, maybe those are "rutabaga" capsets that not related to
virtio-gpu because crosvm has another defs for virtio-gpu capsets [3].
The DRM capset is oddly missing in [3] and code uses "rutabaga" capset
for DRM and virtio-gpu.

[3]
https://github.com/google/crosvm/blob/main/devices/src/virtio/gpu/protocol.rs#L416

Gurchetan, could you please clarify which capsets definitions are
related to virtio-gpu and gfxstream. The
GFXSTREAM_VULKAN/GLES/MAGMA/COMPOSER or just the single GFXSTREAM?

-- 
Best regards,
Dmitry