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authorStephane Eranian <eranian@google.com>2022-03-23 01:15:12 +0300
committerPeter Zijlstra <peterz@infradead.org>2022-04-05 11:24:38 +0300
commit2a606a18cd672a16343d146a126721b34cc6adbd (patch)
treede6c1658adb954ac20819332cf1e033fd7cb8cf2 /include/linux/perf_event.h
parentcc37e520a236069c0de0e7ea455082fa11c73b12 (diff)
downloadlinux-2a606a18cd672a16343d146a126721b34cc6adbd.tar.xz
ACPI: Add perf low power callback
Add an optional callback needed by some PMU features, e.g., AMD BRS, to give a chance to the perf_events code to change its state before a CPU goes to low power and after it comes back. The callback is void when the PERF_NEEDS_LOPWR_CB flag is not set. This flag must be set in arch specific perf_event.h header whenever needed. When not set, there is no impact on the ACPI code. Signed-off-by: Stephane Eranian <eranian@google.com> [peterz: build fix] Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/r/20220322221517.2510440-9-eranian@google.com
Diffstat (limited to 'include/linux/perf_event.h')
-rw-r--r--include/linux/perf_event.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index a411080d5169..da759560eec5 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1676,4 +1676,10 @@ typedef int (perf_snapshot_branch_stack_t)(struct perf_branch_entry *entries,
unsigned int cnt);
DECLARE_STATIC_CALL(perf_snapshot_branch_stack, perf_snapshot_branch_stack_t);
+#ifndef PERF_NEEDS_LOPWR_CB
+static inline void perf_lopwr_cb(bool mode)
+{
+}
+#endif
+
#endif /* _LINUX_PERF_EVENT_H */