Kernel does VCN instance scheduling per context, so when we have
multiple instances we should use new context to be able to utilize
all of them.
Another issue is with AV1, VCN 3 and VCN 4 only support AV1 on
first instance. Kernel parses IBs and switches to first instance when
it detects AV1, but this only works for first submitted IB in context.
The CS would be rejected if we first decode/encode other codecs, kernel
schedules on second instance (default) and then we try to decode/encode AV1.
Cc: mesa-stable
Reviewed-by: Leo Liu <leo.liu@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31249>
David Rosca
712e49f137