perf/core: Add this_cpc() helper

As a preparation for adding yet another indirection.

Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Reviewed-by: Ravi Bangoria <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: Peter Zijlstra

kernel/events/core.c

@@ -1217,23 +1217,28 @@ static int perf_mux_hrtimer_restart_ipi(void *arg)
 	return perf_mux_hrtimer_restart(arg);
 }
 
+static __always_inline struct perf_cpu_pmu_context *this_cpc(struct pmu *pmu)
+{
+	return this_cpu_ptr(pmu->cpu_pmu_context);
+}
+
 void perf_pmu_disable(struct pmu *pmu)
 {
-	int *count = &this_cpu_ptr(pmu->cpu_pmu_context)->pmu_disable_count;
+	int *count = &this_cpc(pmu)->pmu_disable_count;
 	if (!(*count)++)
 		pmu->pmu_disable(pmu);
 }
 
 void perf_pmu_enable(struct pmu *pmu)
 {
-	int *count = &this_cpu_ptr(pmu->cpu_pmu_context)->pmu_disable_count;
+	int *count = &this_cpc(pmu)->pmu_disable_count;
 	if (!--(*count))
 		pmu->pmu_enable(pmu);
 }
 
 static void perf_assert_pmu_disabled(struct pmu *pmu)
 {
-	int *count = &this_cpu_ptr(pmu->cpu_pmu_context)->pmu_disable_count;
+	int *count = &this_cpc(pmu)->pmu_disable_count;
 	WARN_ON_ONCE(*count == 0);
 }
 
@@ -2355,7 +2360,7 @@ static void
 event_sched_out(struct perf_event *event, struct perf_event_context *ctx)
 {
 	struct perf_event_pmu_context *epc = event->pmu_ctx;
-	struct perf_cpu_pmu_context *cpc = this_cpu_ptr(epc->pmu->cpu_pmu_context);
+	struct perf_cpu_pmu_context *cpc = this_cpc(epc->pmu);
 	enum perf_event_state state = PERF_EVENT_STATE_INACTIVE;
 
 	// XXX cpc serialization, probably per-cpu IRQ disabled
@@ -2496,9 +2501,8 @@ __perf_remove_from_context(struct perf_event *event,
 		pmu_ctx->rotate_necessary = 0;
 
 		if (ctx->task && ctx->is_active) {
-			struct perf_cpu_pmu_context *cpc;
+			struct perf_cpu_pmu_context *cpc = this_cpc(pmu_ctx->pmu);
 
-			cpc = this_cpu_ptr(pmu_ctx->pmu->cpu_pmu_context);
 			WARN_ON_ONCE(cpc->task_epc && cpc->task_epc != pmu_ctx);
 			cpc->task_epc = NULL;
 		}
@@ -2636,7 +2640,7 @@ static int
 event_sched_in(struct perf_event *event, struct perf_event_context *ctx)
 {
 	struct perf_event_pmu_context *epc = event->pmu_ctx;
-	struct perf_cpu_pmu_context *cpc = this_cpu_ptr(epc->pmu->cpu_pmu_context);
+	struct perf_cpu_pmu_context *cpc = this_cpc(epc->pmu);
 	int ret = 0;
 
 	WARN_ON_ONCE(event->ctx != ctx);
@@ -2743,7 +2747,7 @@ group_sched_in(struct perf_event *group_event, struct perf_event_context *ctx)
 static int group_can_go_on(struct perf_event *event, int can_add_hw)
 {
 	struct perf_event_pmu_context *epc = event->pmu_ctx;
-	struct perf_cpu_pmu_context *cpc = this_cpu_ptr(epc->pmu->cpu_pmu_context);
+	struct perf_cpu_pmu_context *cpc = this_cpc(epc->pmu);
 
 	/*
 	 * Groups consisting entirely of software events can always go on.
@@ -3366,9 +3370,8 @@ static void __pmu_ctx_sched_out(struct perf_event_pmu_context *pmu_ctx,
 	struct pmu *pmu = pmu_ctx->pmu;
 
 	if (ctx->task && !(ctx->is_active & EVENT_ALL)) {
-		struct perf_cpu_pmu_context *cpc;
+		struct perf_cpu_pmu_context *cpc = this_cpc(pmu);
 
-		cpc = this_cpu_ptr(pmu->cpu_pmu_context);
 		WARN_ON_ONCE(cpc->task_epc && cpc->task_epc != pmu_ctx);
 		cpc->task_epc = NULL;
 	}
@@ -3615,7 +3618,7 @@ static void perf_ctx_sched_task_cb(struct perf_event_context *ctx, bool sched_in
 	struct perf_cpu_pmu_context *cpc;
 
 	list_for_each_entry(pmu_ctx, &ctx->pmu_ctx_list, pmu_ctx_entry) {
-		cpc = this_cpu_ptr(pmu_ctx->pmu->cpu_pmu_context);
+		cpc = this_cpc(pmu_ctx->pmu);
 
 		if (cpc->sched_cb_usage && pmu_ctx->pmu->sched_task)
 			pmu_ctx->pmu->sched_task(pmu_ctx, sched_in);
@@ -3724,7 +3727,7 @@ static DEFINE_PER_CPU(int, perf_sched_cb_usages);
 
 void perf_sched_cb_dec(struct pmu *pmu)
 {
-	struct perf_cpu_pmu_context *cpc = this_cpu_ptr(pmu->cpu_pmu_context);
+	struct perf_cpu_pmu_context *cpc = this_cpc(pmu);
 
 	this_cpu_dec(perf_sched_cb_usages);
 	barrier();
@@ -3736,7 +3739,7 @@ void perf_sched_cb_dec(struct pmu *pmu)
 
 void perf_sched_cb_inc(struct pmu *pmu)
 {
-	struct perf_cpu_pmu_context *cpc = this_cpu_ptr(pmu->cpu_pmu_context);
+	struct perf_cpu_pmu_context *cpc = this_cpc(pmu);
 
 	if (!cpc->sched_cb_usage++)
 		list_add(&cpc->sched_cb_entry, this_cpu_ptr(&sched_cb_list));
@@ -3853,7 +3856,7 @@ static void __link_epc(struct perf_event_pmu_context *pmu_ctx)
 	if (!pmu_ctx->ctx->task)
 		return;
 
-	cpc = this_cpu_ptr(pmu_ctx->pmu->cpu_pmu_context);
+	cpc = this_cpc(pmu_ctx->pmu);
 	WARN_ON_ONCE(cpc->task_epc && cpc->task_epc != pmu_ctx);
 	cpc->task_epc = pmu_ctx;
 }
@@ -3982,10 +3985,9 @@ static int merge_sched_in(struct perf_event *event, void *data)
 			perf_cgroup_event_disable(event, ctx);
 			perf_event_set_state(event, PERF_EVENT_STATE_ERROR);
 		} else {
-			struct perf_cpu_pmu_context *cpc;
+			struct perf_cpu_pmu_context *cpc = this_cpc(event->pmu_ctx->pmu);
 
 			event->pmu_ctx->rotate_necessary = 1;
-			cpc = this_cpu_ptr(event->pmu_ctx->pmu->cpu_pmu_context);
 			perf_mux_hrtimer_restart(cpc);
 			group_update_userpage(event);
 		}