perf/x86/intel: Optimize FIXED_CTR_CTRL access

All the fixed counters share a fixed control register. The current
perf reads and re-writes the fixed control register for each fixed
counter disable/enable, which is unnecessary.

When changing the fixed control register, the entire PMU must be
disabled via the global control register. The changing cannot be taken
effect until the entire PMU is re-enabled. Only updating the fixed
control register once right before the entire PMU re-enabling is
enough.

The read of the fixed control register is not necessary either. The
value can be cached in the per CPU cpu_hw_events.

Test results:

Counting all the fixed counters with the perf bench sched pipe as below
on a SPR machine.

 $perf stat -e cycles,instructions,ref-cycles,slots --no-inherit --
  taskset -c 1 perf bench sched pipe

The Total elapsed time reduces from 5.36s (without the patch) to 4.99s
(with the patch), which is ~6.9% improvement.

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/20220804140729.2951259-1-kan.liang@linux.intel.com

2 files changed, 17 insertions, 9 deletions

diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 1e429e86a7f4..7f4e7e6b45f0 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -2190,6 +2190,12 @@ static void __intel_pmu_enable_all(int added, bool pmi)
 	u64 intel_ctrl = hybrid(cpuc->pmu, intel_ctrl);
 
 	intel_pmu_lbr_enable_all(pmi);
+
+	if (cpuc->fixed_ctrl_val != cpuc->active_fixed_ctrl_val) {
+		wrmsrl(MSR_ARCH_PERFMON_FIXED_CTR_CTRL, cpuc->fixed_ctrl_val);
+		cpuc->active_fixed_ctrl_val = cpuc->fixed_ctrl_val;
+	}
+
 	wrmsrl(MSR_CORE_PERF_GLOBAL_CTRL,
 	       intel_ctrl & ~cpuc->intel_ctrl_guest_mask);
 
@@ -2407,9 +2413,10 @@ static inline void intel_clear_masks(struct perf_event *event, int idx)
 
 static void intel_pmu_disable_fixed(struct perf_event *event)
 {
+	struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
 	struct hw_perf_event *hwc = &event->hw;
-	u64 ctrl_val, mask;
 	int idx = hwc->idx;
+	u64 mask;
 
 	if (is_topdown_idx(idx)) {
 		struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
@@ -2426,9 +2433,7 @@ static void intel_pmu_disable_fixed(struct perf_event *event)
 	intel_clear_masks(event, idx);
 
 	mask = 0xfULL << ((idx - INTEL_PMC_IDX_FIXED) * 4);
-	rdmsrl(hwc->config_base, ctrl_val);
-	ctrl_val &= ~mask;
-	wrmsrl(hwc->config_base, ctrl_val);
+	cpuc->fixed_ctrl_val &= ~mask;
 }
 
 static void intel_pmu_disable_event(struct perf_event *event)
@@ -2701,8 +2706,9 @@ static void intel_pmu_read_event(struct perf_event *event)
 
 static void intel_pmu_enable_fixed(struct perf_event *event)
 {
+	struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
 	struct hw_perf_event *hwc = &event->hw;
-	u64 ctrl_val, mask, bits = 0;
+	u64 mask, bits = 0;
 	int idx = hwc->idx;
 
 	if (is_topdown_idx(idx)) {
@@ -2746,10 +2752,8 @@ static void intel_pmu_enable_fixed(struct perf_event *event)
 		mask |= ICL_FIXED_0_ADAPTIVE << (idx * 4);
 	}
 
-	rdmsrl(hwc->config_base, ctrl_val);
-	ctrl_val &= ~mask;
-	ctrl_val |= bits;
-	wrmsrl(hwc->config_base, ctrl_val);
+	cpuc->fixed_ctrl_val &= ~mask;
+	cpuc->fixed_ctrl_val |= bits;
 }
 
 static void intel_pmu_enable_event(struct perf_event *event)
diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h
index 20c2ee2128fe..371967054871 100644
--- a/arch/x86/events/perf_event.h
+++ b/arch/x86/events/perf_event.h
@@ -270,6 +270,10 @@ struct cpu_hw_events {
 	u64			active_pebs_data_cfg;
 	int			pebs_record_size;
 
+	/* Intel Fixed counter configuration */
+	u64			fixed_ctrl_val;
+	u64			active_fixed_ctrl_val;
+
 	/*
 	 * Intel LBR bits
 	 */