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Implement per-user resource limits to prevent resource exhaustion. Root users can allocate all available contexts (128) and doorbells (255), while non-root users are limited to half of the available resources (64 contexts and 127 doorbells respectively). This prevents scenarios where a single user could monopolize NPU resources and starve other users on multi-user systems. Change doorbell ID and command queue ID allocation errors to debug messages as those are user triggered. Signed-off-by: Karol Wachowski <karol.wachowski@linux.intel.com> Reviewed-by: Lizhi Hou <lizhi.hou@amd.com> Signed-off-by: Maciej Falkowski <maciej.falkowski@linux.intel.com> Link: https://patch.msgid.link/20260302202207.469442-1-maciej.falkowski@linux.intel.com