perf/x86/intel/lbr: Add the function pointers for LBR save and restore
The MSRs of Architectural LBR are different from previous model-specific
LBR. Perf has to implement different functions to save and restore them.
The function pointers for LBR save and restore are introduced. Perf
should initialize the corresponding functions at boot time.
The generic optimizations, e.g. avoiding restore LBR if no one else
touched them, still apply for Architectural LBRs. The related codes are
not moved to model-specific functions.
Current model-specific LBR functions are set as default.
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/1593780569-62993-5-git-send-email-kan.liang@linux.intel.com
diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h
index 312d27f..6d11813 100644
--- a/arch/x86/events/perf_event.h
+++ b/arch/x86/events/perf_event.h
@@ -695,6 +695,8 @@ struct x86_pmu {
void (*lbr_reset)(void);
void (*lbr_read)(struct cpu_hw_events *cpuc);
+ void (*lbr_save)(void *ctx);
+ void (*lbr_restore)(void *ctx);
/*
* Intel PT/LBR/BTS are exclusive
@@ -1090,6 +1092,10 @@ void intel_pmu_lbr_read_32(struct cpu_hw_events *cpuc);
void intel_pmu_lbr_read_64(struct cpu_hw_events *cpuc);
+void intel_pmu_lbr_save(void *ctx);
+
+void intel_pmu_lbr_restore(void *ctx);
+
void intel_pmu_lbr_init_core(void);
void intel_pmu_lbr_init_nhm(void);