perf/x86: Add hw_perf_event::aux_config

Start a new section for AUX PMUs in hw_perf_event.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>

arch/x86/events/intel/pt.c

@@ -416,15 +416,15 @@ static bool pt_event_valid(struct perf_event *event)
 static void pt_config_start(struct perf_event *event)
 {
 	struct pt *pt = this_cpu_ptr(&pt_ctx);
-	u64 ctl = event->hw.config;
+	u64 ctl = event->hw.aux_config;
 
 	ctl |= RTIT_CTL_TRACEEN;
 	if (READ_ONCE(pt->vmx_on))
 		perf_aux_output_flag(&pt->handle, PERF_AUX_FLAG_PARTIAL);
 	else
 		wrmsrl(MSR_IA32_RTIT_CTL, ctl);
 
-	WRITE_ONCE(event->hw.config, ctl);
+	WRITE_ONCE(event->hw.aux_config, ctl);
 }
 
 /* Address ranges and their corresponding msr configuration registers */
@@ -503,7 +503,7 @@ static void pt_config(struct perf_event *event)
 	u64 reg;
 
 	/* First round: clear STATUS, in particular the PSB byte counter. */
-	if (!event->hw.config) {
+	if (!event->hw.aux_config) {
 		perf_event_itrace_started(event);
 		wrmsrl(MSR_IA32_RTIT_STATUS, 0);
 	}
@@ -533,14 +533,14 @@ static void pt_config(struct perf_event *event)
 
 	reg |= (event->attr.config & PT_CONFIG_MASK);
 
-	event->hw.config = reg;
+	event->hw.aux_config = reg;
 	pt_config_start(event);
 }
 
 static void pt_config_stop(struct perf_event *event)
 {
 	struct pt *pt = this_cpu_ptr(&pt_ctx);
-	u64 ctl = READ_ONCE(event->hw.config);
+	u64 ctl = READ_ONCE(event->hw.aux_config);
 
 	/* may be already stopped by a PMI */
 	if (!(ctl & RTIT_CTL_TRACEEN))
@@ -550,7 +550,7 @@ static void pt_config_stop(struct perf_event *event)
 	if (!READ_ONCE(pt->vmx_on))
 		wrmsrl(MSR_IA32_RTIT_CTL, ctl);
 
-	WRITE_ONCE(event->hw.config, ctl);
+	WRITE_ONCE(event->hw.aux_config, ctl);
 
 	/*
 	 * A wrmsr that disables trace generation serializes other PT
@@ -1557,7 +1557,7 @@ void intel_pt_handle_vmx(int on)
 
 	/* Turn PTs back on */
 	if (!on && event)
-		wrmsrl(MSR_IA32_RTIT_CTL, event->hw.config);
+		wrmsrl(MSR_IA32_RTIT_CTL, event->hw.aux_config);
 
 	local_irq_restore(flags);
 }

include/linux/perf_event.h

@@ -168,6 +168,9 @@ struct hw_perf_event {
 			struct hw_perf_event_extra extra_reg;
 			struct hw_perf_event_extra branch_reg;
 		};
+		struct { /* aux / Intel-PT */
+			u64		aux_config;
+		};
 		struct { /* software */
 			struct hrtimer	hrtimer;
 		};