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On AMD Fam19h Zen3, the branch sampling (BRS) feature must be disabled before entering low power and re-enabled (if was active) when returning from low power. Otherwise, the NMI interrupt may be held up for too long and cause problems. Stopping BRS will cause the NMI to be delivered if it was held up. Define a perf_amd_brs_lopwr_cb() callback to stop/restart BRS. The callback is protected by a jump label which is enabled only when AMD BRS is detected. In all other cases, the callback is never called. Signed-off-by: Stephane Eranian <eranian@google.com> [peterz: static_call() and build fixes] Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/r/20220322221517.2510440-10-eranian@google.com