AMDGPU pstate is per-device, not per Vulkan logical devices. The same
AMDGPU device is shared accross logical devices because the driver
creates only one winsys per fd. The kernel only allows one context
at a time per AMDGPU device, otherwise it returns -EBUSY.
Fixes this by acquiring pstate on-demand to avoid this multiple
logical device problem.
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Tatsuyuki Ishi <ishitatsuyuki@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17712>