linux-kernel - [PATCH 08/49] perf/x86: Hybrid PMU support for event constraints

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Date:   Mon,  8 Feb 2021 07:25:05 -0800
From:   kan.liang@...ux.intel.com
To:     peterz@...radead.org, acme@...nel.org, mingo@...nel.org,
        linux-kernel@...r.kernel.org
Cc:     tglx@...utronix.de, bp@...en8.de, namhyung@...nel.org,
        jolsa@...hat.com, ak@...ux.intel.com, yao.jin@...ux.intel.com,
        alexander.shishkin@...ux.intel.com, adrian.hunter@...el.com,
        Kan Liang <kan.liang@...ux.intel.com>
Subject: [PATCH 08/49] perf/x86: Hybrid PMU support for event constraints

From: Kan Liang <kan.liang@...ux.intel.com>

The events are different among hybrid PMUs. Each hybrid PMU should use
its own event constraints.

Reviewed-by: Andi Kleen <ak@...ux.intel.com>
Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
---
 arch/x86/events/core.c       | 3 ++-
 arch/x86/events/intel/core.c | 5 +++--
 arch/x86/events/intel/ds.c   | 5 +++--
 arch/x86/events/perf_event.h | 5 +++++
 4 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index 27c87a7..2160142 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -1514,6 +1514,7 @@ void perf_event_print_debug(void)
 	struct cpu_hw_events *cpuc = &per_cpu(cpu_hw_events, cpu);
 	int num_counters = X86_HYBRID_READ_FROM_CPUC(num_counters, cpuc);
 	int num_counters_fixed = X86_HYBRID_READ_FROM_CPUC(num_counters_fixed, cpuc);
+	struct event_constraint *pebs_constraints = X86_HYBRID_READ_FROM_CPUC(pebs_constraints, cpuc);
 	unsigned long flags;
 	int idx;
 
@@ -1533,7 +1534,7 @@ void perf_event_print_debug(void)
 		pr_info("CPU#%d: status:     %016llx\n", cpu, status);
 		pr_info("CPU#%d: overflow:   %016llx\n", cpu, overflow);
 		pr_info("CPU#%d: fixed:      %016llx\n", cpu, fixed);
-		if (x86_pmu.pebs_constraints) {
+		if (pebs_constraints) {
 			rdmsrl(MSR_IA32_PEBS_ENABLE, pebs);
 			pr_info("CPU#%d: pebs:       %016llx\n", cpu, pebs);
 		}
diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 9baa6b6..9acfa82 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -3136,10 +3136,11 @@ struct event_constraint *
 x86_get_event_constraints(struct cpu_hw_events *cpuc, int idx,
 			  struct perf_event *event)
 {
+	struct event_constraint *event_constraints = X86_HYBRID_READ_FROM_CPUC(event_constraints, cpuc);
 	struct event_constraint *c;
 
-	if (x86_pmu.event_constraints) {
-		for_each_event_constraint(c, x86_pmu.event_constraints) {
+	if (event_constraints) {
+		for_each_event_constraint(c, event_constraints) {
 			if (constraint_match(c, event->hw.config)) {
 				event->hw.flags |= c->flags;
 				return c;
diff --git a/arch/x86/events/intel/ds.c b/arch/x86/events/intel/ds.c
index a528966..ba651d9 100644
--- a/arch/x86/events/intel/ds.c
+++ b/arch/x86/events/intel/ds.c
@@ -959,13 +959,14 @@ struct event_constraint intel_spr_pebs_event_constraints[] = {
 
 struct event_constraint *intel_pebs_constraints(struct perf_event *event)
 {
+	struct event_constraint *pebs_constraints = X86_HYBRID_READ_FROM_EVENT(pebs_constraints, event);
 	struct event_constraint *c;
 
 	if (!event->attr.precise_ip)
 		return NULL;
 
-	if (x86_pmu.pebs_constraints) {
-		for_each_event_constraint(c, x86_pmu.pebs_constraints) {
+	if (pebs_constraints) {
+		for_each_event_constraint(c, pebs_constraints) {
 			if (constraint_match(c, event->hw.config)) {
 				event->hw.flags |= c->flags;
 				return c;
diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h
index 00fcd92..7a5d036 100644
--- a/arch/x86/events/perf_event.h
+++ b/arch/x86/events/perf_event.h
@@ -661,6 +661,8 @@ struct x86_hybrid_pmu {
 					[PERF_COUNT_HW_CACHE_MAX]
 					[PERF_COUNT_HW_CACHE_OP_MAX]
 					[PERF_COUNT_HW_CACHE_RESULT_MAX];
+	struct event_constraint		*event_constraints;
+	struct event_constraint		*pebs_constraints;
 };
 
 #define IS_X86_HYBRID			cpu_feature_enabled(X86_FEATURE_HYBRID_CPU)
@@ -673,6 +675,9 @@ struct x86_hybrid_pmu {
 #define X86_HYBRID_READ_FROM_CPUC(_name, _cpuc)				\
 	(_cpuc && HAS_VALID_HYBRID_PMU_IN_CPUC(_cpuc) ? x86_pmu.hybrid_pmu[(_cpuc)->hybrid_pmu_idx]._name : x86_pmu._name)
 
+#define X86_HYBRID_READ_FROM_EVENT(_name, _event)			\
+	(IS_X86_HYBRID ? ((struct x86_hybrid_pmu *)(_event->pmu))->_name : x86_pmu._name)
+
 /*
  * struct x86_pmu - generic x86 pmu
  */
-- 
2.7.4