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Insufficient data is exported to allow direct access to TPMI registers through MMIO. On non-partitioned systems domain_id can be used both for mapping CPUs to their compute die IDs and for mapping die indices to their MMIO memory blocks presented to userspace via TPMI debugfs. However on partitioned systems the debugfs association doesn't work anymore. This is due to how TPMI partitioning influences domain_id calculation. The previous association is lost on partitioned systems in order to keep using domain_id for mapping CPUs to compute dies. Expose the instance ID in sysfs that's unique in the scope of one TPMI partition (and hence one TPMI device). It's a physical index into mapped MMIO blocks and can be used by userspace to figure out how to directly access TPMI registers. Signed-off-by: Maciej Wieczor-Retman <maciej.wieczor-retman@intel.com> Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Link: https://patch.msgid.link/b9ae8d5f1ab86bcdb1a8636fa48865a9e49e2e21.1775665057.git.m.wieczorretman@pm.me Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>