drm/xe/pmu: Extract xe_pmu_event_update()

Like other pmu drivers, keep the update separate from the read so it can
be called from other methods (like stop()) without side effects.

Reviewed-by: Rodrigo Vivi <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]
Signed-off-by: Lucas De Marchi <[e-mail]>

drivers/gpu/drm/xe/xe_pmu.c

···
 	return val;
 }
 
-static void xe_pmu_event_read(struct perf_event *event)
+static void xe_pmu_event_update(struct perf_event *event)
 {
-	struct xe_device *xe = container_of(event->pmu, typeof(*xe), pmu.base);
 	struct hw_perf_event *hwc = &event->hw;
-	struct xe_pmu *pmu = &xe->pmu;
 	u64 prev, new;
-
-	if (!pmu->registered) {
-		event->hw.state = PERF_HES_STOPPED;
-		return;
-	}
 
 	prev = local64_read(&hwc->prev_count);
 	do {
···
 	} while (!local64_try_cmpxchg(&hwc->prev_count, &prev, new));
 
 	local64_add(new - prev, &event->count);
+}
+
+static void xe_pmu_event_read(struct perf_event *event)
+{
+	struct xe_device *xe = container_of(event->pmu, typeof(*xe), pmu.base);
+	struct xe_pmu *pmu = &xe->pmu;
+
+	if (!pmu->registered) {
+		event->hw.state = PERF_HES_STOPPED;
+		return;
+	}
+
+	xe_pmu_event_update(event);
 }
 
 static void xe_pmu_enable(struct perf_event *event)
···
 
 	if (pmu->registered)
 		if (flags & PERF_EF_UPDATE)
-			xe_pmu_event_read(event);
+			xe_pmu_event_update(event);
 
 	event->hw.state = PERF_HES_STOPPED;
 }