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Support starting of Hardware Trace Macro (HTM) function via debugfs interface. Under debugfs folder "/sys/kernel/debug/powerpc/htmdump", add file "htmstart". The interface allows starting of htm via this file by writing value "1". Also allows stopping of htm tracing by writing value "0" to this file. Any other value returns -EINVAL. Signed-off-by: Athira Rajeev <atrajeev@linux.ibm.com> Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com> Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com> Link: https://patch.msgid.link/20250420180844.53128-4-atrajeev@linux.ibm.com